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Linux v2.6.17-rc2
[linux-2.6/next.git] / net / ipv6 / addrconf.c
blob445006ee452281733917bb84f31da513f21c8ed6
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 ATOMIC_NOTIFIER_HEAD(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 .accept_ra_pinfo = 1,
170 #ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
172 .rtr_probe_interval = 60 * HZ,
173 #ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175 #endif
176 #endif
177 };
178
179 static struct ipv6_devconf ipv6_devconf_dflt = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 #ifdef CONFIG_IPV6_PRIVACY
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 #endif
197 .max_addresses = IPV6_MAX_ADDRESSES,
198 .accept_ra_defrtr = 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205 #endif
206 #endif
207 };
208
209 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
210 #if 0
211 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
212 #endif
213 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
214
215 #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
216
217 static inline unsigned ipv6_addr_scope2type(unsigned scope)
218 {
219 switch(scope) {
220 case IPV6_ADDR_SCOPE_NODELOCAL:
221 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
222 IPV6_ADDR_LOOPBACK);
223 case IPV6_ADDR_SCOPE_LINKLOCAL:
224 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
225 IPV6_ADDR_LINKLOCAL);
226 case IPV6_ADDR_SCOPE_SITELOCAL:
227 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
228 IPV6_ADDR_SITELOCAL);
229 }
230 return IPV6_ADDR_SCOPE_TYPE(scope);
231 }
232
233 int __ipv6_addr_type(const struct in6_addr *addr)
234 {
235 u32 st;
236
237 st = addr->s6_addr32[0];
238
239 /* Consider all addresses with the first three bits different of
240 000 and 111 as unicasts.
241 */
242 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
243 (st & htonl(0xE0000000)) != htonl(0xE0000000))
244 return (IPV6_ADDR_UNICAST |
245 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
246
247 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
248 /* multicast */
249 /* addr-select 3.1 */
250 return (IPV6_ADDR_MULTICAST |
251 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
252 }
253
254 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
255 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
256 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
257 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
258 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
259 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
260
261 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
262 if (addr->s6_addr32[2] == 0) {
263 if (addr->s6_addr32[3] == 0)
264 return IPV6_ADDR_ANY;
265
266 if (addr->s6_addr32[3] == htonl(0x00000001))
267 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
268 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
269
270 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
271 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
272 }
273
274 if (addr->s6_addr32[2] == htonl(0x0000ffff))
275 return (IPV6_ADDR_MAPPED |
276 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
277 }
278
279 return (IPV6_ADDR_RESERVED |
280 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
281 }
282
283 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
284 {
285 if (del_timer(&ifp->timer))
286 __in6_ifa_put(ifp);
287 }
288
289 enum addrconf_timer_t
290 {
291 AC_NONE,
292 AC_DAD,
293 AC_RS,
294 };
295
296 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
297 enum addrconf_timer_t what,
298 unsigned long when)
299 {
300 if (!del_timer(&ifp->timer))
301 in6_ifa_hold(ifp);
302
303 switch (what) {
304 case AC_DAD:
305 ifp->timer.function = addrconf_dad_timer;
306 break;
307 case AC_RS:
308 ifp->timer.function = addrconf_rs_timer;
309 break;
310 default:;
311 }
312 ifp->timer.expires = jiffies + when;
313 add_timer(&ifp->timer);
314 }
315
316 /* Nobody refers to this device, we may destroy it. */
317
318 void in6_dev_finish_destroy(struct inet6_dev *idev)
319 {
320 struct net_device *dev = idev->dev;
321 BUG_TRAP(idev->addr_list==NULL);
322 BUG_TRAP(idev->mc_list==NULL);
323 #ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
332 kfree(idev);
333 }
334
335 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
336 {
337 struct inet6_dev *ndev;
338
339 ASSERT_RTNL();
340
341 if (dev->mtu < IPV6_MIN_MTU)
342 return NULL;
343
344 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
345
346 if (ndev == NULL)
347 return NULL;
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (ndev->nd_parms == NULL) {
356 kfree(ndev);
357 return NULL;
358 }
359 /* We refer to the device */
360 dev_hold(dev);
361
362 if (snmp6_alloc_dev(ndev) < 0) {
363 ADBG((KERN_WARNING
364 "%s(): cannot allocate memory for statistics; dev=%s.\n",
365 __FUNCTION__, dev->name));
366 neigh_parms_release(&nd_tbl, ndev->nd_parms);
367 ndev->dead = 1;
368 in6_dev_finish_destroy(ndev);
369 return NULL;
370 }
371
372 if (snmp6_register_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
375 __FUNCTION__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
381
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
384 */
385 in6_dev_hold(ndev);
386
387 #ifdef CONFIG_IPV6_PRIVACY
388 init_timer(&ndev->regen_timer);
389 ndev->regen_timer.function = ipv6_regen_rndid;
390 ndev->regen_timer.data = (unsigned long) ndev;
391 if ((dev->flags&IFF_LOOPBACK) ||
392 dev->type == ARPHRD_TUNNEL ||
393 dev->type == ARPHRD_NONE ||
394 dev->type == ARPHRD_SIT) {
395 printk(KERN_INFO
396 "%s: Disabled Privacy Extensions\n",
397 dev->name);
398 ndev->cnf.use_tempaddr = -1;
399 } else {
400 in6_dev_hold(ndev);
401 ipv6_regen_rndid((unsigned long) ndev);
402 }
403 #endif
404
405 if (netif_carrier_ok(dev))
406 ndev->if_flags |= IF_READY;
407
408 write_lock_bh(&addrconf_lock);
409 dev->ip6_ptr = ndev;
410 write_unlock_bh(&addrconf_lock);
411
412 ipv6_mc_init_dev(ndev);
413 ndev->tstamp = jiffies;
414 #ifdef CONFIG_SYSCTL
415 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
416 NET_IPV6_NEIGH, "ipv6",
417 &ndisc_ifinfo_sysctl_change,
418 NULL);
419 addrconf_sysctl_register(ndev, &ndev->cnf);
420 #endif
421 return ndev;
422 }
423
424 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
425 {
426 struct inet6_dev *idev;
427
428 ASSERT_RTNL();
429
430 if ((idev = __in6_dev_get(dev)) == NULL) {
431 if ((idev = ipv6_add_dev(dev)) == NULL)
432 return NULL;
433 }
434
435 if (dev->flags&IFF_UP)
436 ipv6_mc_up(idev);
437 return idev;
438 }
439
440 #ifdef CONFIG_SYSCTL
441 static void dev_forward_change(struct inet6_dev *idev)
442 {
443 struct net_device *dev;
444 struct inet6_ifaddr *ifa;
445 struct in6_addr addr;
446
447 if (!idev)
448 return;
449 dev = idev->dev;
450 if (dev && (dev->flags & IFF_MULTICAST)) {
451 ipv6_addr_all_routers(&addr);
452
453 if (idev->cnf.forwarding)
454 ipv6_dev_mc_inc(dev, &addr);
455 else
456 ipv6_dev_mc_dec(dev, &addr);
457 }
458 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
459 if (idev->cnf.forwarding)
460 addrconf_join_anycast(ifa);
461 else
462 addrconf_leave_anycast(ifa);
463 }
464 }
465
466
467 static void addrconf_forward_change(void)
468 {
469 struct net_device *dev;
470 struct inet6_dev *idev;
471
472 read_lock(&dev_base_lock);
473 for (dev=dev_base; dev; dev=dev->next) {
474 read_lock(&addrconf_lock);
475 idev = __in6_dev_get(dev);
476 if (idev) {
477 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
478 idev->cnf.forwarding = ipv6_devconf.forwarding;
479 if (changed)
480 dev_forward_change(idev);
481 }
482 read_unlock(&addrconf_lock);
483 }
484 read_unlock(&dev_base_lock);
485 }
486 #endif
487
488 /* Nobody refers to this ifaddr, destroy it */
489
490 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
491 {
492 BUG_TRAP(ifp->if_next==NULL);
493 BUG_TRAP(ifp->lst_next==NULL);
494 #ifdef NET_REFCNT_DEBUG
495 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
496 #endif
497
498 in6_dev_put(ifp->idev);
499
500 if (del_timer(&ifp->timer))
501 printk("Timer is still running, when freeing ifa=%p\n", ifp);
502
503 if (!ifp->dead) {
504 printk("Freeing alive inet6 address %p\n", ifp);
505 return;
506 }
507 dst_release(&ifp->rt->u.dst);
508
509 kfree(ifp);
510 }
511
512 /* On success it returns ifp with increased reference count */
513
514 static struct inet6_ifaddr *
515 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
516 int scope, u32 flags)
517 {
518 struct inet6_ifaddr *ifa = NULL;
519 struct rt6_info *rt;
520 int hash;
521 int err = 0;
522
523 read_lock_bh(&addrconf_lock);
524 if (idev->dead) {
525 err = -ENODEV; /*XXX*/
526 goto out2;
527 }
528
529 write_lock(&addrconf_hash_lock);
530
531 /* Ignore adding duplicate addresses on an interface */
532 if (ipv6_chk_same_addr(addr, idev->dev)) {
533 ADBG(("ipv6_add_addr: already assigned\n"));
534 err = -EEXIST;
535 goto out;
536 }
537
538 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
539
540 if (ifa == NULL) {
541 ADBG(("ipv6_add_addr: malloc failed\n"));
542 err = -ENOBUFS;
543 goto out;
544 }
545
546 rt = addrconf_dst_alloc(idev, addr, 0);
547 if (IS_ERR(rt)) {
548 err = PTR_ERR(rt);
549 goto out;
550 }
551
552 ipv6_addr_copy(&ifa->addr, addr);
553
554 spin_lock_init(&ifa->lock);
555 init_timer(&ifa->timer);
556 ifa->timer.data = (unsigned long) ifa;
557 ifa->scope = scope;
558 ifa->prefix_len = pfxlen;
559 ifa->flags = flags | IFA_F_TENTATIVE;
560 ifa->cstamp = ifa->tstamp = jiffies;
561
562 ifa->idev = idev;
563 in6_dev_hold(idev);
564 /* For caller */
565 in6_ifa_hold(ifa);
566
567 /* Add to big hash table */
568 hash = ipv6_addr_hash(addr);
569
570 ifa->lst_next = inet6_addr_lst[hash];
571 inet6_addr_lst[hash] = ifa;
572 in6_ifa_hold(ifa);
573 write_unlock(&addrconf_hash_lock);
574
575 write_lock(&idev->lock);
576 /* Add to inet6_dev unicast addr list. */
577 ifa->if_next = idev->addr_list;
578 idev->addr_list = ifa;
579
580 #ifdef CONFIG_IPV6_PRIVACY
581 if (ifa->flags&IFA_F_TEMPORARY) {
582 ifa->tmp_next = idev->tempaddr_list;
583 idev->tempaddr_list = ifa;
584 in6_ifa_hold(ifa);
585 }
586 #endif
587
588 ifa->rt = rt;
589
590 in6_ifa_hold(ifa);
591 write_unlock(&idev->lock);
592 out2:
593 read_unlock_bh(&addrconf_lock);
594
595 if (likely(err == 0))
596 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
597 else {
598 kfree(ifa);
599 ifa = ERR_PTR(err);
600 }
601
602 return ifa;
603 out:
604 write_unlock(&addrconf_hash_lock);
605 goto out2;
606 }
607
608 /* This function wants to get referenced ifp and releases it before return */
609
610 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
611 {
612 struct inet6_ifaddr *ifa, **ifap;
613 struct inet6_dev *idev = ifp->idev;
614 int hash;
615 int deleted = 0, onlink = 0;
616 unsigned long expires = jiffies;
617
618 hash = ipv6_addr_hash(&ifp->addr);
619
620 ifp->dead = 1;
621
622 write_lock_bh(&addrconf_hash_lock);
623 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
624 ifap = &ifa->lst_next) {
625 if (ifa == ifp) {
626 *ifap = ifa->lst_next;
627 __in6_ifa_put(ifp);
628 ifa->lst_next = NULL;
629 break;
630 }
631 }
632 write_unlock_bh(&addrconf_hash_lock);
633
634 write_lock_bh(&idev->lock);
635 #ifdef CONFIG_IPV6_PRIVACY
636 if (ifp->flags&IFA_F_TEMPORARY) {
637 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
638 ifap = &ifa->tmp_next) {
639 if (ifa == ifp) {
640 *ifap = ifa->tmp_next;
641 if (ifp->ifpub) {
642 in6_ifa_put(ifp->ifpub);
643 ifp->ifpub = NULL;
644 }
645 __in6_ifa_put(ifp);
646 ifa->tmp_next = NULL;
647 break;
648 }
649 }
650 }
651 #endif
652
653 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
654 if (ifa == ifp) {
655 *ifap = ifa->if_next;
656 __in6_ifa_put(ifp);
657 ifa->if_next = NULL;
658 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
659 break;
660 deleted = 1;
661 continue;
662 } else if (ifp->flags & IFA_F_PERMANENT) {
663 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
664 ifp->prefix_len)) {
665 if (ifa->flags & IFA_F_PERMANENT) {
666 onlink = 1;
667 if (deleted)
668 break;
669 } else {
670 unsigned long lifetime;
671
672 if (!onlink)
673 onlink = -1;
674
675 spin_lock(&ifa->lock);
676 lifetime = min_t(unsigned long,
677 ifa->valid_lft, 0x7fffffffUL/HZ);
678 if (time_before(expires,
679 ifa->tstamp + lifetime * HZ))
680 expires = ifa->tstamp + lifetime * HZ;
681 spin_unlock(&ifa->lock);
682 }
683 }
684 }
685 ifap = &ifa->if_next;
686 }
687 write_unlock_bh(&idev->lock);
688
689 ipv6_ifa_notify(RTM_DELADDR, ifp);
690
691 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
692
693 addrconf_del_timer(ifp);
694
695 /*
696 * Purge or update corresponding prefix
697 *
698 * 1) we don't purge prefix here if address was not permanent.
699 * prefix is managed by its own lifetime.
700 * 2) if there're no addresses, delete prefix.
701 * 3) if there're still other permanent address(es),
702 * corresponding prefix is still permanent.
703 * 4) otherwise, update prefix lifetime to the
704 * longest valid lifetime among the corresponding
705 * addresses on the device.
706 * Note: subsequent RA will update lifetime.
707 *
708 * --yoshfuji
709 */
710 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
711 struct in6_addr prefix;
712 struct rt6_info *rt;
713
714 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
715 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
716
717 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
718 if (onlink == 0) {
719 ip6_del_rt(rt, NULL, NULL, NULL);
720 rt = NULL;
721 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
722 rt->rt6i_expires = expires;
723 rt->rt6i_flags |= RTF_EXPIRES;
724 }
725 }
726 dst_release(&rt->u.dst);
727 }
728
729 in6_ifa_put(ifp);
730 }
731
732 #ifdef CONFIG_IPV6_PRIVACY
733 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
734 {
735 struct inet6_dev *idev = ifp->idev;
736 struct in6_addr addr, *tmpaddr;
737 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
738 int tmp_plen;
739 int ret = 0;
740 int max_addresses;
741
742 write_lock(&idev->lock);
743 if (ift) {
744 spin_lock_bh(&ift->lock);
745 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
746 spin_unlock_bh(&ift->lock);
747 tmpaddr = &addr;
748 } else {
749 tmpaddr = NULL;
750 }
751 retry:
752 in6_dev_hold(idev);
753 if (idev->cnf.use_tempaddr <= 0) {
754 write_unlock(&idev->lock);
755 printk(KERN_INFO
756 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
757 in6_dev_put(idev);
758 ret = -1;
759 goto out;
760 }
761 spin_lock_bh(&ifp->lock);
762 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
763 idev->cnf.use_tempaddr = -1; /*XXX*/
764 spin_unlock_bh(&ifp->lock);
765 write_unlock(&idev->lock);
766 printk(KERN_WARNING
767 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
768 in6_dev_put(idev);
769 ret = -1;
770 goto out;
771 }
772 in6_ifa_hold(ifp);
773 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
774 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
775 spin_unlock_bh(&ifp->lock);
776 write_unlock(&idev->lock);
777 printk(KERN_WARNING
778 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
779 in6_ifa_put(ifp);
780 in6_dev_put(idev);
781 ret = -1;
782 goto out;
783 }
784 memcpy(&addr.s6_addr[8], idev->rndid, 8);
785 tmp_valid_lft = min_t(__u32,
786 ifp->valid_lft,
787 idev->cnf.temp_valid_lft);
788 tmp_prefered_lft = min_t(__u32,
789 ifp->prefered_lft,
790 idev->cnf.temp_prefered_lft - desync_factor / HZ);
791 tmp_plen = ifp->prefix_len;
792 max_addresses = idev->cnf.max_addresses;
793 tmp_cstamp = ifp->cstamp;
794 tmp_tstamp = ifp->tstamp;
795 spin_unlock_bh(&ifp->lock);
796
797 write_unlock(&idev->lock);
798 ift = !max_addresses ||
799 ipv6_count_addresses(idev) < max_addresses ?
800 ipv6_add_addr(idev, &addr, tmp_plen,
801 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
802 if (!ift || IS_ERR(ift)) {
803 in6_ifa_put(ifp);
804 in6_dev_put(idev);
805 printk(KERN_INFO
806 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
807 tmpaddr = &addr;
808 write_lock(&idev->lock);
809 goto retry;
810 }
811
812 spin_lock_bh(&ift->lock);
813 ift->ifpub = ifp;
814 ift->valid_lft = tmp_valid_lft;
815 ift->prefered_lft = tmp_prefered_lft;
816 ift->cstamp = tmp_cstamp;
817 ift->tstamp = tmp_tstamp;
818 spin_unlock_bh(&ift->lock);
819
820 addrconf_dad_start(ift, 0);
821 in6_ifa_put(ift);
822 in6_dev_put(idev);
823 out:
824 return ret;
825 }
826 #endif
827
828 /*
829 * Choose an appropriate source address (RFC3484)
830 */
831 struct ipv6_saddr_score {
832 int addr_type;
833 unsigned int attrs;
834 int matchlen;
835 int scope;
836 unsigned int rule;
837 };
838
839 #define IPV6_SADDR_SCORE_LOCAL 0x0001
840 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
841 #define IPV6_SADDR_SCORE_HOA 0x0008
842 #define IPV6_SADDR_SCORE_OIF 0x0010
843 #define IPV6_SADDR_SCORE_LABEL 0x0020
844 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
845
846 static int inline ipv6_saddr_preferred(int type)
847 {
848 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
849 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
850 return 1;
851 return 0;
852 }
853
854 /* static matching label */
855 static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
856 {
857 /*
858 * prefix (longest match) label
859 * -----------------------------
860 * ::1/128 0
861 * ::/0 1
862 * 2002::/16 2
863 * ::/96 3
864 * ::ffff:0:0/96 4
865 */
866 if (type & IPV6_ADDR_LOOPBACK)
867 return 0;
868 else if (type & IPV6_ADDR_COMPATv4)
869 return 3;
870 else if (type & IPV6_ADDR_MAPPED)
871 return 4;
872 else if (addr->s6_addr16[0] == htons(0x2002))
873 return 2;
874 return 1;
875 }
876
877 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
878 struct in6_addr *daddr, struct in6_addr *saddr)
879 {
880 struct ipv6_saddr_score hiscore;
881 struct inet6_ifaddr *ifa_result = NULL;
882 int daddr_type = __ipv6_addr_type(daddr);
883 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
884 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
885 struct net_device *dev;
886
887 memset(&hiscore, 0, sizeof(hiscore));
888
889 read_lock(&dev_base_lock);
890 read_lock(&addrconf_lock);
891
892 for (dev = dev_base; dev; dev=dev->next) {
893 struct inet6_dev *idev;
894 struct inet6_ifaddr *ifa;
895
896 /* Rule 0: Candidate Source Address (section 4)
897 * - multicast and link-local destination address,
898 * the set of candidate source address MUST only
899 * include addresses assigned to interfaces
900 * belonging to the same link as the outgoing
901 * interface.
902 * (- For site-local destination addresses, the
903 * set of candidate source addresses MUST only
904 * include addresses assigned to interfaces
905 * belonging to the same site as the outgoing
906 * interface.)
907 */
908 if ((daddr_type & IPV6_ADDR_MULTICAST ||
909 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
910 daddr_dev && dev != daddr_dev)
911 continue;
912
913 idev = __in6_dev_get(dev);
914 if (!idev)
915 continue;
916
917 read_lock_bh(&idev->lock);
918 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
919 struct ipv6_saddr_score score;
920
921 score.addr_type = __ipv6_addr_type(&ifa->addr);
922
923 /* Rule 0:
924 * - Tentative Address (RFC2462 section 5.4)
925 * - A tentative address is not considered
926 * "assigned to an interface" in the traditional
927 * sense.
928 * - Candidate Source Address (section 4)
929 * - In any case, anycast addresses, multicast
930 * addresses, and the unspecified address MUST
931 * NOT be included in a candidate set.
932 */
933 if (ifa->flags & IFA_F_TENTATIVE)
934 continue;
935 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
936 score.addr_type & IPV6_ADDR_MULTICAST)) {
937 LIMIT_NETDEBUG(KERN_DEBUG
938 "ADDRCONF: unspecified / multicast address"
939 "assigned as unicast address on %s",
940 dev->name);
941 continue;
942 }
943
944 score.attrs = 0;
945 score.matchlen = 0;
946 score.scope = 0;
947 score.rule = 0;
948
949 if (ifa_result == NULL) {
950 /* record it if the first available entry */
951 goto record_it;
952 }
953
954 /* Rule 1: Prefer same address */
955 if (hiscore.rule < 1) {
956 if (ipv6_addr_equal(&ifa_result->addr, daddr))
957 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
958 hiscore.rule++;
959 }
960 if (ipv6_addr_equal(&ifa->addr, daddr)) {
961 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
962 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
963 score.rule = 1;
964 goto record_it;
965 }
966 } else {
967 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
968 continue;
969 }
970
971 /* Rule 2: Prefer appropriate scope */
972 if (hiscore.rule < 2) {
973 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
974 hiscore.rule++;
975 }
976 score.scope = __ipv6_addr_src_scope(score.addr_type);
977 if (hiscore.scope < score.scope) {
978 if (hiscore.scope < daddr_scope) {
979 score.rule = 2;
980 goto record_it;
981 } else
982 continue;
983 } else if (score.scope < hiscore.scope) {
984 if (score.scope < daddr_scope)
985 continue;
986 else {
987 score.rule = 2;
988 goto record_it;
989 }
990 }
991
992 /* Rule 3: Avoid deprecated address */
993 if (hiscore.rule < 3) {
994 if (ipv6_saddr_preferred(hiscore.addr_type) ||
995 !(ifa_result->flags & IFA_F_DEPRECATED))
996 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
997 hiscore.rule++;
998 }
999 if (ipv6_saddr_preferred(score.addr_type) ||
1000 !(ifa->flags & IFA_F_DEPRECATED)) {
1001 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1002 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1003 score.rule = 3;
1004 goto record_it;
1005 }
1006 } else {
1007 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1008 continue;
1009 }
1010
1011 /* Rule 4: Prefer home address -- not implemented yet */
1012 if (hiscore.rule < 4)
1013 hiscore.rule++;
1014
1015 /* Rule 5: Prefer outgoing interface */
1016 if (hiscore.rule < 5) {
1017 if (daddr_dev == NULL ||
1018 daddr_dev == ifa_result->idev->dev)
1019 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1020 hiscore.rule++;
1021 }
1022 if (daddr_dev == NULL ||
1023 daddr_dev == ifa->idev->dev) {
1024 score.attrs |= IPV6_SADDR_SCORE_OIF;
1025 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1026 score.rule = 5;
1027 goto record_it;
1028 }
1029 } else {
1030 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1031 continue;
1032 }
1033
1034 /* Rule 6: Prefer matching label */
1035 if (hiscore.rule < 6) {
1036 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1037 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1038 hiscore.rule++;
1039 }
1040 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1041 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1042 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1043 score.rule = 6;
1044 goto record_it;
1045 }
1046 } else {
1047 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1048 continue;
1049 }
1050
1051 #ifdef CONFIG_IPV6_PRIVACY
1052 /* Rule 7: Prefer public address
1053 * Note: prefer temprary address if use_tempaddr >= 2
1054 */
1055 if (hiscore.rule < 7) {
1056 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1057 (ifa_result->idev->cnf.use_tempaddr >= 2))
1058 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1059 hiscore.rule++;
1060 }
1061 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1062 (ifa->idev->cnf.use_tempaddr >= 2)) {
1063 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1064 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1065 score.rule = 7;
1066 goto record_it;
1067 }
1068 } else {
1069 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1070 continue;
1071 }
1072 #endif
1073 /* Rule 8: Use longest matching prefix */
1074 if (hiscore.rule < 8) {
1075 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1076 hiscore.rule++;
1077 }
1078 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1079 if (score.matchlen > hiscore.matchlen) {
1080 score.rule = 8;
1081 goto record_it;
1082 }
1083 #if 0
1084 else if (score.matchlen < hiscore.matchlen)
1085 continue;
1086 #endif
1087
1088 /* Final Rule: choose first available one */
1089 continue;
1090 record_it:
1091 if (ifa_result)
1092 in6_ifa_put(ifa_result);
1093 in6_ifa_hold(ifa);
1094 ifa_result = ifa;
1095 hiscore = score;
1096 }
1097 read_unlock_bh(&idev->lock);
1098 }
1099 read_unlock(&addrconf_lock);
1100 read_unlock(&dev_base_lock);
1101
1102 if (!ifa_result)
1103 return -EADDRNOTAVAIL;
1104
1105 ipv6_addr_copy(saddr, &ifa_result->addr);
1106 in6_ifa_put(ifa_result);
1107 return 0;
1108 }
1109
1110
1111 int ipv6_get_saddr(struct dst_entry *dst,
1112 struct in6_addr *daddr, struct in6_addr *saddr)
1113 {
1114 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1115 }
1116
1117
1118 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1119 {
1120 struct inet6_dev *idev;
1121 int err = -EADDRNOTAVAIL;
1122
1123 read_lock(&addrconf_lock);
1124 if ((idev = __in6_dev_get(dev)) != NULL) {
1125 struct inet6_ifaddr *ifp;
1126
1127 read_lock_bh(&idev->lock);
1128 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1129 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1130 ipv6_addr_copy(addr, &ifp->addr);
1131 err = 0;
1132 break;
1133 }
1134 }
1135 read_unlock_bh(&idev->lock);
1136 }
1137 read_unlock(&addrconf_lock);
1138 return err;
1139 }
1140
1141 static int ipv6_count_addresses(struct inet6_dev *idev)
1142 {
1143 int cnt = 0;
1144 struct inet6_ifaddr *ifp;
1145
1146 read_lock_bh(&idev->lock);
1147 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1148 cnt++;
1149 read_unlock_bh(&idev->lock);
1150 return cnt;
1151 }
1152
1153 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1154 {
1155 struct inet6_ifaddr * ifp;
1156 u8 hash = ipv6_addr_hash(addr);
1157
1158 read_lock_bh(&addrconf_hash_lock);
1159 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1160 if (ipv6_addr_equal(&ifp->addr, addr) &&
1161 !(ifp->flags&IFA_F_TENTATIVE)) {
1162 if (dev == NULL || ifp->idev->dev == dev ||
1163 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1164 break;
1165 }
1166 }
1167 read_unlock_bh(&addrconf_hash_lock);
1168 return ifp != NULL;
1169 }
1170
1171 static
1172 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1173 {
1174 struct inet6_ifaddr * ifp;
1175 u8 hash = ipv6_addr_hash(addr);
1176
1177 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1178 if (ipv6_addr_equal(&ifp->addr, addr)) {
1179 if (dev == NULL || ifp->idev->dev == dev)
1180 break;
1181 }
1182 }
1183 return ifp != NULL;
1184 }
1185
1186 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1187 {
1188 struct inet6_ifaddr * ifp;
1189 u8 hash = ipv6_addr_hash(addr);
1190
1191 read_lock_bh(&addrconf_hash_lock);
1192 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1193 if (ipv6_addr_equal(&ifp->addr, addr)) {
1194 if (dev == NULL || ifp->idev->dev == dev ||
1195 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1196 in6_ifa_hold(ifp);
1197 break;
1198 }
1199 }
1200 }
1201 read_unlock_bh(&addrconf_hash_lock);
1202
1203 return ifp;
1204 }
1205
1206 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1207 {
1208 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1209 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1210 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1211 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1212 int sk_ipv6only = ipv6_only_sock(sk);
1213 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1214 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1215 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1216
1217 if (!sk2_rcv_saddr && !sk_ipv6only)
1218 return 1;
1219
1220 if (addr_type2 == IPV6_ADDR_ANY &&
1221 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1222 return 1;
1223
1224 if (addr_type == IPV6_ADDR_ANY &&
1225 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1226 return 1;
1227
1228 if (sk2_rcv_saddr6 &&
1229 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1230 return 1;
1231
1232 if (addr_type == IPV6_ADDR_MAPPED &&
1233 !sk2_ipv6only &&
1234 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1235 return 1;
1236
1237 return 0;
1238 }
1239
1240 /* Gets referenced address, destroys ifaddr */
1241
1242 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1243 {
1244 if (ifp->flags&IFA_F_PERMANENT) {
1245 spin_lock_bh(&ifp->lock);
1246 addrconf_del_timer(ifp);
1247 ifp->flags |= IFA_F_TENTATIVE;
1248 spin_unlock_bh(&ifp->lock);
1249 in6_ifa_put(ifp);
1250 #ifdef CONFIG_IPV6_PRIVACY
1251 } else if (ifp->flags&IFA_F_TEMPORARY) {
1252 struct inet6_ifaddr *ifpub;
1253 spin_lock_bh(&ifp->lock);
1254 ifpub = ifp->ifpub;
1255 if (ifpub) {
1256 in6_ifa_hold(ifpub);
1257 spin_unlock_bh(&ifp->lock);
1258 ipv6_create_tempaddr(ifpub, ifp);
1259 in6_ifa_put(ifpub);
1260 } else {
1261 spin_unlock_bh(&ifp->lock);
1262 }
1263 ipv6_del_addr(ifp);
1264 #endif
1265 } else
1266 ipv6_del_addr(ifp);
1267 }
1268
1269 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1270 {
1271 if (net_ratelimit())
1272 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1273 addrconf_dad_stop(ifp);
1274 }
1275
1276 /* Join to solicited addr multicast group. */
1277
1278 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1279 {
1280 struct in6_addr maddr;
1281
1282 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1283 return;
1284
1285 addrconf_addr_solict_mult(addr, &maddr);
1286 ipv6_dev_mc_inc(dev, &maddr);
1287 }
1288
1289 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1290 {
1291 struct in6_addr maddr;
1292
1293 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1294 return;
1295
1296 addrconf_addr_solict_mult(addr, &maddr);
1297 __ipv6_dev_mc_dec(idev, &maddr);
1298 }
1299
1300 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1301 {
1302 struct in6_addr addr;
1303 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1304 if (ipv6_addr_any(&addr))
1305 return;
1306 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1307 }
1308
1309 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1310 {
1311 struct in6_addr addr;
1312 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1313 if (ipv6_addr_any(&addr))
1314 return;
1315 __ipv6_dev_ac_dec(ifp->idev, &addr);
1316 }
1317
1318 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1319 {
1320 if (dev->addr_len != ETH_ALEN)
1321 return -1;
1322 memcpy(eui, dev->dev_addr, 3);
1323 memcpy(eui + 5, dev->dev_addr + 3, 3);
1324
1325 /*
1326 * The zSeries OSA network cards can be shared among various
1327 * OS instances, but the OSA cards have only one MAC address.
1328 * This leads to duplicate address conflicts in conjunction
1329 * with IPv6 if more than one instance uses the same card.
1330 *
1331 * The driver for these cards can deliver a unique 16-bit
1332 * identifier for each instance sharing the same card. It is
1333 * placed instead of 0xFFFE in the interface identifier. The
1334 * "u" bit of the interface identifier is not inverted in this
1335 * case. Hence the resulting interface identifier has local
1336 * scope according to RFC2373.
1337 */
1338 if (dev->dev_id) {
1339 eui[3] = (dev->dev_id >> 8) & 0xFF;
1340 eui[4] = dev->dev_id & 0xFF;
1341 } else {
1342 eui[3] = 0xFF;
1343 eui[4] = 0xFE;
1344 eui[0] ^= 2;
1345 }
1346 return 0;
1347 }
1348
1349 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1350 {
1351 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1352 if (dev->addr_len != ARCNET_ALEN)
1353 return -1;
1354 memset(eui, 0, 7);
1355 eui[7] = *(u8*)dev->dev_addr;
1356 return 0;
1357 }
1358
1359 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1360 {
1361 if (dev->addr_len != INFINIBAND_ALEN)
1362 return -1;
1363 memcpy(eui, dev->dev_addr + 12, 8);
1364 eui[0] |= 2;
1365 return 0;
1366 }
1367
1368 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1369 {
1370 switch (dev->type) {
1371 case ARPHRD_ETHER:
1372 case ARPHRD_FDDI:
1373 case ARPHRD_IEEE802_TR:
1374 return addrconf_ifid_eui48(eui, dev);
1375 case ARPHRD_ARCNET:
1376 return addrconf_ifid_arcnet(eui, dev);
1377 case ARPHRD_INFINIBAND:
1378 return addrconf_ifid_infiniband(eui, dev);
1379 }
1380 return -1;
1381 }
1382
1383 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1384 {
1385 int err = -1;
1386 struct inet6_ifaddr *ifp;
1387
1388 read_lock_bh(&idev->lock);
1389 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1390 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1391 memcpy(eui, ifp->addr.s6_addr+8, 8);
1392 err = 0;
1393 break;
1394 }
1395 }
1396 read_unlock_bh(&idev->lock);
1397 return err;
1398 }
1399
1400 #ifdef CONFIG_IPV6_PRIVACY
1401 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1402 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1403 {
1404 regen:
1405 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1406 idev->rndid[0] &= ~0x02;
1407
1408 /*
1409 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1410 * check if generated address is not inappropriate
1411 *
1412 * - Reserved subnet anycast (RFC 2526)
1413 * 11111101 11....11 1xxxxxxx
1414 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1415 * 00-00-5E-FE-xx-xx-xx-xx
1416 * - value 0
1417 * - XXX: already assigned to an address on the device
1418 */
1419 if (idev->rndid[0] == 0xfd &&
1420 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1421 (idev->rndid[7]&0x80))
1422 goto regen;
1423 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1424 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1425 goto regen;
1426 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1427 goto regen;
1428 }
1429
1430 return 0;
1431 }
1432
1433 static void ipv6_regen_rndid(unsigned long data)
1434 {
1435 struct inet6_dev *idev = (struct inet6_dev *) data;
1436 unsigned long expires;
1437
1438 read_lock_bh(&addrconf_lock);
1439 write_lock_bh(&idev->lock);
1440
1441 if (idev->dead)
1442 goto out;
1443
1444 if (__ipv6_regen_rndid(idev) < 0)
1445 goto out;
1446
1447 expires = jiffies +
1448 idev->cnf.temp_prefered_lft * HZ -
1449 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1450 if (time_before(expires, jiffies)) {
1451 printk(KERN_WARNING
1452 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1453 idev->dev->name);
1454 goto out;
1455 }
1456
1457 if (!mod_timer(&idev->regen_timer, expires))
1458 in6_dev_hold(idev);
1459
1460 out:
1461 write_unlock_bh(&idev->lock);
1462 read_unlock_bh(&addrconf_lock);
1463 in6_dev_put(idev);
1464 }
1465
1466 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1467 int ret = 0;
1468
1469 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1470 ret = __ipv6_regen_rndid(idev);
1471 return ret;
1472 }
1473 #endif
1474
1475 /*
1476 * Add prefix route.
1477 */
1478
1479 static void
1480 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1481 unsigned long expires, u32 flags)
1482 {
1483 struct in6_rtmsg rtmsg;
1484
1485 memset(&rtmsg, 0, sizeof(rtmsg));
1486 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1487 rtmsg.rtmsg_dst_len = plen;
1488 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1489 rtmsg.rtmsg_ifindex = dev->ifindex;
1490 rtmsg.rtmsg_info = expires;
1491 rtmsg.rtmsg_flags = RTF_UP|flags;
1492 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1493
1494 /* Prevent useless cloning on PtP SIT.
1495 This thing is done here expecting that the whole
1496 class of non-broadcast devices need not cloning.
1497 */
1498 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1499 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1500
1501 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1502 }
1503
1504 /* Create "default" multicast route to the interface */
1505
1506 static void addrconf_add_mroute(struct net_device *dev)
1507 {
1508 struct in6_rtmsg rtmsg;
1509
1510 memset(&rtmsg, 0, sizeof(rtmsg));
1511 ipv6_addr_set(&rtmsg.rtmsg_dst,
1512 htonl(0xFF000000), 0, 0, 0);
1513 rtmsg.rtmsg_dst_len = 8;
1514 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1515 rtmsg.rtmsg_ifindex = dev->ifindex;
1516 rtmsg.rtmsg_flags = RTF_UP;
1517 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1518 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1519 }
1520
1521 static void sit_route_add(struct net_device *dev)
1522 {
1523 struct in6_rtmsg rtmsg;
1524
1525 memset(&rtmsg, 0, sizeof(rtmsg));
1526
1527 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1528 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1529
1530 /* prefix length - 96 bits "::d.d.d.d" */
1531 rtmsg.rtmsg_dst_len = 96;
1532 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1533 rtmsg.rtmsg_ifindex = dev->ifindex;
1534
1535 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1536 }
1537
1538 static void addrconf_add_lroute(struct net_device *dev)
1539 {
1540 struct in6_addr addr;
1541
1542 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1543 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1544 }
1545
1546 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1547 {
1548 struct inet6_dev *idev;
1549
1550 ASSERT_RTNL();
1551
1552 if ((idev = ipv6_find_idev(dev)) == NULL)
1553 return NULL;
1554
1555 /* Add default multicast route */
1556 addrconf_add_mroute(dev);
1557
1558 /* Add link local route */
1559 addrconf_add_lroute(dev);
1560 return idev;
1561 }
1562
1563 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1564 {
1565 struct prefix_info *pinfo;
1566 __u32 valid_lft;
1567 __u32 prefered_lft;
1568 int addr_type;
1569 unsigned long rt_expires;
1570 struct inet6_dev *in6_dev;
1571
1572 pinfo = (struct prefix_info *) opt;
1573
1574 if (len < sizeof(struct prefix_info)) {
1575 ADBG(("addrconf: prefix option too short\n"));
1576 return;
1577 }
1578
1579 /*
1580 * Validation checks ([ADDRCONF], page 19)
1581 */
1582
1583 addr_type = ipv6_addr_type(&pinfo->prefix);
1584
1585 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1586 return;
1587
1588 valid_lft = ntohl(pinfo->valid);
1589 prefered_lft = ntohl(pinfo->prefered);
1590
1591 if (prefered_lft > valid_lft) {
1592 if (net_ratelimit())
1593 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1594 return;
1595 }
1596
1597 in6_dev = in6_dev_get(dev);
1598
1599 if (in6_dev == NULL) {
1600 if (net_ratelimit())
1601 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1602 return;
1603 }
1604
1605 /*
1606 * Two things going on here:
1607 * 1) Add routes for on-link prefixes
1608 * 2) Configure prefixes with the auto flag set
1609 */
1610
1611 /* Avoid arithmetic overflow. Really, we could
1612 save rt_expires in seconds, likely valid_lft,
1613 but it would require division in fib gc, that it
1614 not good.
1615 */
1616 if (valid_lft >= 0x7FFFFFFF/HZ)
1617 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1618 else
1619 rt_expires = valid_lft * HZ;
1620
1621 /*
1622 * We convert this (in jiffies) to clock_t later.
1623 * Avoid arithmetic overflow there as well.
1624 * Overflow can happen only if HZ < USER_HZ.
1625 */
1626 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1627 rt_expires = 0x7FFFFFFF / USER_HZ;
1628
1629 if (pinfo->onlink) {
1630 struct rt6_info *rt;
1631 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1632
1633 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1634 if (rt->rt6i_flags&RTF_EXPIRES) {
1635 if (valid_lft == 0) {
1636 ip6_del_rt(rt, NULL, NULL, NULL);
1637 rt = NULL;
1638 } else {
1639 rt->rt6i_expires = jiffies + rt_expires;
1640 }
1641 }
1642 } else if (valid_lft) {
1643 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1644 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1645 }
1646 if (rt)
1647 dst_release(&rt->u.dst);
1648 }
1649
1650 /* Try to figure out our local address for this prefix */
1651
1652 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1653 struct inet6_ifaddr * ifp;
1654 struct in6_addr addr;
1655 int create = 0, update_lft = 0;
1656
1657 if (pinfo->prefix_len == 64) {
1658 memcpy(&addr, &pinfo->prefix, 8);
1659 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1660 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1661 in6_dev_put(in6_dev);
1662 return;
1663 }
1664 goto ok;
1665 }
1666 if (net_ratelimit())
1667 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1668 pinfo->prefix_len);
1669 in6_dev_put(in6_dev);
1670 return;
1671
1672 ok:
1673
1674 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1675
1676 if (ifp == NULL && valid_lft) {
1677 int max_addresses = in6_dev->cnf.max_addresses;
1678
1679 /* Do not allow to create too much of autoconfigured
1680 * addresses; this would be too easy way to crash kernel.
1681 */
1682 if (!max_addresses ||
1683 ipv6_count_addresses(in6_dev) < max_addresses)
1684 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1685 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1686
1687 if (!ifp || IS_ERR(ifp)) {
1688 in6_dev_put(in6_dev);
1689 return;
1690 }
1691
1692 update_lft = create = 1;
1693 ifp->cstamp = jiffies;
1694 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1695 }
1696
1697 if (ifp) {
1698 int flags;
1699 unsigned long now;
1700 #ifdef CONFIG_IPV6_PRIVACY
1701 struct inet6_ifaddr *ift;
1702 #endif
1703 u32 stored_lft;
1704
1705 /* update lifetime (RFC2462 5.5.3 e) */
1706 spin_lock(&ifp->lock);
1707 now = jiffies;
1708 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1709 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1710 else
1711 stored_lft = 0;
1712 if (!update_lft && stored_lft) {
1713 if (valid_lft > MIN_VALID_LIFETIME ||
1714 valid_lft > stored_lft)
1715 update_lft = 1;
1716 else if (stored_lft <= MIN_VALID_LIFETIME) {
1717 /* valid_lft <= stored_lft is always true */
1718 /* XXX: IPsec */
1719 update_lft = 0;
1720 } else {
1721 valid_lft = MIN_VALID_LIFETIME;
1722 if (valid_lft < prefered_lft)
1723 prefered_lft = valid_lft;
1724 update_lft = 1;
1725 }
1726 }
1727
1728 if (update_lft) {
1729 ifp->valid_lft = valid_lft;
1730 ifp->prefered_lft = prefered_lft;
1731 ifp->tstamp = now;
1732 flags = ifp->flags;
1733 ifp->flags &= ~IFA_F_DEPRECATED;
1734 spin_unlock(&ifp->lock);
1735
1736 if (!(flags&IFA_F_TENTATIVE))
1737 ipv6_ifa_notify(0, ifp);
1738 } else
1739 spin_unlock(&ifp->lock);
1740
1741 #ifdef CONFIG_IPV6_PRIVACY
1742 read_lock_bh(&in6_dev->lock);
1743 /* update all temporary addresses in the list */
1744 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1745 /*
1746 * When adjusting the lifetimes of an existing
1747 * temporary address, only lower the lifetimes.
1748 * Implementations must not increase the
1749 * lifetimes of an existing temporary address
1750 * when processing a Prefix Information Option.
1751 */
1752 spin_lock(&ift->lock);
1753 flags = ift->flags;
1754 if (ift->valid_lft > valid_lft &&
1755 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1756 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1757 if (ift->prefered_lft > prefered_lft &&
1758 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1759 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1760 spin_unlock(&ift->lock);
1761 if (!(flags&IFA_F_TENTATIVE))
1762 ipv6_ifa_notify(0, ift);
1763 }
1764
1765 if (create && in6_dev->cnf.use_tempaddr > 0) {
1766 /*
1767 * When a new public address is created as described in [ADDRCONF],
1768 * also create a new temporary address.
1769 */
1770 read_unlock_bh(&in6_dev->lock);
1771 ipv6_create_tempaddr(ifp, NULL);
1772 } else {
1773 read_unlock_bh(&in6_dev->lock);
1774 }
1775 #endif
1776 in6_ifa_put(ifp);
1777 addrconf_verify(0);
1778 }
1779 }
1780 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1781 in6_dev_put(in6_dev);
1782 }
1783
1784 /*
1785 * Set destination address.
1786 * Special case for SIT interfaces where we create a new "virtual"
1787 * device.
1788 */
1789 int addrconf_set_dstaddr(void __user *arg)
1790 {
1791 struct in6_ifreq ireq;
1792 struct net_device *dev;
1793 int err = -EINVAL;
1794
1795 rtnl_lock();
1796
1797 err = -EFAULT;
1798 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1799 goto err_exit;
1800
1801 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1802
1803 err = -ENODEV;
1804 if (dev == NULL)
1805 goto err_exit;
1806
1807 if (dev->type == ARPHRD_SIT) {
1808 struct ifreq ifr;
1809 mm_segment_t oldfs;
1810 struct ip_tunnel_parm p;
1811
1812 err = -EADDRNOTAVAIL;
1813 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1814 goto err_exit;
1815
1816 memset(&p, 0, sizeof(p));
1817 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1818 p.iph.saddr = 0;
1819 p.iph.version = 4;
1820 p.iph.ihl = 5;
1821 p.iph.protocol = IPPROTO_IPV6;
1822 p.iph.ttl = 64;
1823 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1824
1825 oldfs = get_fs(); set_fs(KERNEL_DS);
1826 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1827 set_fs(oldfs);
1828
1829 if (err == 0) {
1830 err = -ENOBUFS;
1831 if ((dev = __dev_get_by_name(p.name)) == NULL)
1832 goto err_exit;
1833 err = dev_open(dev);
1834 }
1835 }
1836
1837 err_exit:
1838 rtnl_unlock();
1839 return err;
1840 }
1841
1842 /*
1843 * Manual configuration of address on an interface
1844 */
1845 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1846 {
1847 struct inet6_ifaddr *ifp;
1848 struct inet6_dev *idev;
1849 struct net_device *dev;
1850 int scope;
1851
1852 ASSERT_RTNL();
1853
1854 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1855 return -ENODEV;
1856
1857 if (!(dev->flags&IFF_UP))
1858 return -ENETDOWN;
1859
1860 if ((idev = addrconf_add_dev(dev)) == NULL)
1861 return -ENOBUFS;
1862
1863 scope = ipv6_addr_scope(pfx);
1864
1865 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1866 if (!IS_ERR(ifp)) {
1867 addrconf_dad_start(ifp, 0);
1868 in6_ifa_put(ifp);
1869 return 0;
1870 }
1871
1872 return PTR_ERR(ifp);
1873 }
1874
1875 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1876 {
1877 struct inet6_ifaddr *ifp;
1878 struct inet6_dev *idev;
1879 struct net_device *dev;
1880
1881 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1882 return -ENODEV;
1883
1884 if ((idev = __in6_dev_get(dev)) == NULL)
1885 return -ENXIO;
1886
1887 read_lock_bh(&idev->lock);
1888 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1889 if (ifp->prefix_len == plen &&
1890 ipv6_addr_equal(pfx, &ifp->addr)) {
1891 in6_ifa_hold(ifp);
1892 read_unlock_bh(&idev->lock);
1893
1894 ipv6_del_addr(ifp);
1895
1896 /* If the last address is deleted administratively,
1897 disable IPv6 on this interface.
1898 */
1899 if (idev->addr_list == NULL)
1900 addrconf_ifdown(idev->dev, 1);
1901 return 0;
1902 }
1903 }
1904 read_unlock_bh(&idev->lock);
1905 return -EADDRNOTAVAIL;
1906 }
1907
1908
1909 int addrconf_add_ifaddr(void __user *arg)
1910 {
1911 struct in6_ifreq ireq;
1912 int err;
1913
1914 if (!capable(CAP_NET_ADMIN))
1915 return -EPERM;
1916
1917 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1918 return -EFAULT;
1919
1920 rtnl_lock();
1921 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1922 rtnl_unlock();
1923 return err;
1924 }
1925
1926 int addrconf_del_ifaddr(void __user *arg)
1927 {
1928 struct in6_ifreq ireq;
1929 int err;
1930
1931 if (!capable(CAP_NET_ADMIN))
1932 return -EPERM;
1933
1934 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1935 return -EFAULT;
1936
1937 rtnl_lock();
1938 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1939 rtnl_unlock();
1940 return err;
1941 }
1942
1943 static void sit_add_v4_addrs(struct inet6_dev *idev)
1944 {
1945 struct inet6_ifaddr * ifp;
1946 struct in6_addr addr;
1947 struct net_device *dev;
1948 int scope;
1949
1950 ASSERT_RTNL();
1951
1952 memset(&addr, 0, sizeof(struct in6_addr));
1953 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1954
1955 if (idev->dev->flags&IFF_POINTOPOINT) {
1956 addr.s6_addr32[0] = htonl(0xfe800000);
1957 scope = IFA_LINK;
1958 } else {
1959 scope = IPV6_ADDR_COMPATv4;
1960 }
1961
1962 if (addr.s6_addr32[3]) {
1963 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1964 if (!IS_ERR(ifp)) {
1965 spin_lock_bh(&ifp->lock);
1966 ifp->flags &= ~IFA_F_TENTATIVE;
1967 spin_unlock_bh(&ifp->lock);
1968 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1969 in6_ifa_put(ifp);
1970 }
1971 return;
1972 }
1973
1974 for (dev = dev_base; dev != NULL; dev = dev->next) {
1975 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1976 if (in_dev && (dev->flags & IFF_UP)) {
1977 struct in_ifaddr * ifa;
1978
1979 int flag = scope;
1980
1981 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1982 int plen;
1983
1984 addr.s6_addr32[3] = ifa->ifa_local;
1985
1986 if (ifa->ifa_scope == RT_SCOPE_LINK)
1987 continue;
1988 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1989 if (idev->dev->flags&IFF_POINTOPOINT)
1990 continue;
1991 flag |= IFA_HOST;
1992 }
1993 if (idev->dev->flags&IFF_POINTOPOINT)
1994 plen = 64;
1995 else
1996 plen = 96;
1997
1998 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1999 IFA_F_PERMANENT);
2000 if (!IS_ERR(ifp)) {
2001 spin_lock_bh(&ifp->lock);
2002 ifp->flags &= ~IFA_F_TENTATIVE;
2003 spin_unlock_bh(&ifp->lock);
2004 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2005 in6_ifa_put(ifp);
2006 }
2007 }
2008 }
2009 }
2010 }
2011
2012 static void init_loopback(struct net_device *dev)
2013 {
2014 struct inet6_dev *idev;
2015 struct inet6_ifaddr * ifp;
2016
2017 /* ::1 */
2018
2019 ASSERT_RTNL();
2020
2021 if ((idev = ipv6_find_idev(dev)) == NULL) {
2022 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2023 return;
2024 }
2025
2026 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2027 if (!IS_ERR(ifp)) {
2028 spin_lock_bh(&ifp->lock);
2029 ifp->flags &= ~IFA_F_TENTATIVE;
2030 spin_unlock_bh(&ifp->lock);
2031 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032 in6_ifa_put(ifp);
2033 }
2034 }
2035
2036 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2037 {
2038 struct inet6_ifaddr * ifp;
2039
2040 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2041 if (!IS_ERR(ifp)) {
2042 addrconf_dad_start(ifp, 0);
2043 in6_ifa_put(ifp);
2044 }
2045 }
2046
2047 static void addrconf_dev_config(struct net_device *dev)
2048 {
2049 struct in6_addr addr;
2050 struct inet6_dev * idev;
2051
2052 ASSERT_RTNL();
2053
2054 if ((dev->type != ARPHRD_ETHER) &&
2055 (dev->type != ARPHRD_FDDI) &&
2056 (dev->type != ARPHRD_IEEE802_TR) &&
2057 (dev->type != ARPHRD_ARCNET) &&
2058 (dev->type != ARPHRD_INFINIBAND)) {
2059 /* Alas, we support only Ethernet autoconfiguration. */
2060 return;
2061 }
2062
2063 idev = addrconf_add_dev(dev);
2064 if (idev == NULL)
2065 return;
2066
2067 memset(&addr, 0, sizeof(struct in6_addr));
2068 addr.s6_addr32[0] = htonl(0xFE800000);
2069
2070 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2071 addrconf_add_linklocal(idev, &addr);
2072 }
2073
2074 static void addrconf_sit_config(struct net_device *dev)
2075 {
2076 struct inet6_dev *idev;
2077
2078 ASSERT_RTNL();
2079
2080 /*
2081 * Configure the tunnel with one of our IPv4
2082 * addresses... we should configure all of
2083 * our v4 addrs in the tunnel
2084 */
2085
2086 if ((idev = ipv6_find_idev(dev)) == NULL) {
2087 printk(KERN_DEBUG "init sit: add_dev failed\n");
2088 return;
2089 }
2090
2091 sit_add_v4_addrs(idev);
2092
2093 if (dev->flags&IFF_POINTOPOINT) {
2094 addrconf_add_mroute(dev);
2095 addrconf_add_lroute(dev);
2096 } else
2097 sit_route_add(dev);
2098 }
2099
2100 static inline int
2101 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2102 {
2103 struct in6_addr lladdr;
2104
2105 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2106 addrconf_add_linklocal(idev, &lladdr);
2107 return 0;
2108 }
2109 return -1;
2110 }
2111
2112 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2113 {
2114 struct net_device *link_dev;
2115
2116 /* first try to inherit the link-local address from the link device */
2117 if (idev->dev->iflink &&
2118 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2119 if (!ipv6_inherit_linklocal(idev, link_dev))
2120 return;
2121 }
2122 /* then try to inherit it from any device */
2123 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2124 if (!ipv6_inherit_linklocal(idev, link_dev))
2125 return;
2126 }
2127 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2128 }
2129
2130 /*
2131 * Autoconfigure tunnel with a link-local address so routing protocols,
2132 * DHCPv6, MLD etc. can be run over the virtual link
2133 */
2134
2135 static void addrconf_ip6_tnl_config(struct net_device *dev)
2136 {
2137 struct inet6_dev *idev;
2138
2139 ASSERT_RTNL();
2140
2141 if ((idev = addrconf_add_dev(dev)) == NULL) {
2142 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2143 return;
2144 }
2145 ip6_tnl_add_linklocal(idev);
2146 }
2147
2148 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2149 void * data)
2150 {
2151 struct net_device *dev = (struct net_device *) data;
2152 struct inet6_dev *idev = __in6_dev_get(dev);
2153 int run_pending = 0;
2154
2155 switch(event) {
2156 case NETDEV_UP:
2157 case NETDEV_CHANGE:
2158 if (event == NETDEV_UP) {
2159 if (!netif_carrier_ok(dev)) {
2160 /* device is not ready yet. */
2161 printk(KERN_INFO
2162 "ADDRCONF(NETDEV_UP): %s: "
2163 "link is not ready\n",
2164 dev->name);
2165 break;
2166 }
2167
2168 if (idev)
2169 idev->if_flags |= IF_READY;
2170 } else {
2171 if (!netif_carrier_ok(dev)) {
2172 /* device is still not ready. */
2173 break;
2174 }
2175
2176 if (idev) {
2177 if (idev->if_flags & IF_READY) {
2178 /* device is already configured. */
2179 break;
2180 }
2181 idev->if_flags |= IF_READY;
2182 }
2183
2184 printk(KERN_INFO
2185 "ADDRCONF(NETDEV_CHANGE): %s: "
2186 "link becomes ready\n",
2187 dev->name);
2188
2189 run_pending = 1;
2190 }
2191
2192 switch(dev->type) {
2193 case ARPHRD_SIT:
2194 addrconf_sit_config(dev);
2195 break;
2196 case ARPHRD_TUNNEL6:
2197 addrconf_ip6_tnl_config(dev);
2198 break;
2199 case ARPHRD_LOOPBACK:
2200 init_loopback(dev);
2201 break;
2202
2203 default:
2204 addrconf_dev_config(dev);
2205 break;
2206 };
2207 if (idev) {
2208 if (run_pending)
2209 addrconf_dad_run(idev);
2210
2211 /* If the MTU changed during the interface down, when the
2212 interface up, the changed MTU must be reflected in the
2213 idev as well as routers.
2214 */
2215 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2216 rt6_mtu_change(dev, dev->mtu);
2217 idev->cnf.mtu6 = dev->mtu;
2218 }
2219 idev->tstamp = jiffies;
2220 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2221 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2222 stop IPv6 on this interface.
2223 */
2224 if (dev->mtu < IPV6_MIN_MTU)
2225 addrconf_ifdown(dev, event != NETDEV_DOWN);
2226 }
2227 break;
2228
2229 case NETDEV_CHANGEMTU:
2230 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2231 rt6_mtu_change(dev, dev->mtu);
2232 idev->cnf.mtu6 = dev->mtu;
2233 break;
2234 }
2235
2236 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2237
2238 case NETDEV_DOWN:
2239 case NETDEV_UNREGISTER:
2240 /*
2241 * Remove all addresses from this interface.
2242 */
2243 addrconf_ifdown(dev, event != NETDEV_DOWN);
2244 break;
2245
2246 case NETDEV_CHANGENAME:
2247 #ifdef CONFIG_SYSCTL
2248 if (idev) {
2249 addrconf_sysctl_unregister(&idev->cnf);
2250 neigh_sysctl_unregister(idev->nd_parms);
2251 neigh_sysctl_register(dev, idev->nd_parms,
2252 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2253 &ndisc_ifinfo_sysctl_change,
2254 NULL);
2255 addrconf_sysctl_register(idev, &idev->cnf);
2256 }
2257 #endif
2258 break;
2259 };
2260
2261 return NOTIFY_OK;
2262 }
2263
2264 /*
2265 * addrconf module should be notified of a device going up
2266 */
2267 static struct notifier_block ipv6_dev_notf = {
2268 .notifier_call = addrconf_notify,
2269 .priority = 0
2270 };
2271
2272 static int addrconf_ifdown(struct net_device *dev, int how)
2273 {
2274 struct inet6_dev *idev;
2275 struct inet6_ifaddr *ifa, **bifa;
2276 int i;
2277
2278 ASSERT_RTNL();
2279
2280 if (dev == &loopback_dev && how == 1)
2281 how = 0;
2282
2283 rt6_ifdown(dev);
2284 neigh_ifdown(&nd_tbl, dev);
2285
2286 idev = __in6_dev_get(dev);
2287 if (idev == NULL)
2288 return -ENODEV;
2289
2290 /* Step 1: remove reference to ipv6 device from parent device.
2291 Do not dev_put!
2292 */
2293 if (how == 1) {
2294 write_lock_bh(&addrconf_lock);
2295 dev->ip6_ptr = NULL;
2296 idev->dead = 1;
2297 write_unlock_bh(&addrconf_lock);
2298
2299 /* Step 1.5: remove snmp6 entry */
2300 snmp6_unregister_dev(idev);
2301
2302 }
2303
2304 /* Step 2: clear hash table */
2305 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2306 bifa = &inet6_addr_lst[i];
2307
2308 write_lock_bh(&addrconf_hash_lock);
2309 while ((ifa = *bifa) != NULL) {
2310 if (ifa->idev == idev) {
2311 *bifa = ifa->lst_next;
2312 ifa->lst_next = NULL;
2313 addrconf_del_timer(ifa);
2314 in6_ifa_put(ifa);
2315 continue;
2316 }
2317 bifa = &ifa->lst_next;
2318 }
2319 write_unlock_bh(&addrconf_hash_lock);
2320 }
2321
2322 write_lock_bh(&idev->lock);
2323
2324 /* Step 3: clear flags for stateless addrconf */
2325 if (how != 1)
2326 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2327
2328 /* Step 4: clear address list */
2329 #ifdef CONFIG_IPV6_PRIVACY
2330 if (how == 1 && del_timer(&idev->regen_timer))
2331 in6_dev_put(idev);
2332
2333 /* clear tempaddr list */
2334 while ((ifa = idev->tempaddr_list) != NULL) {
2335 idev->tempaddr_list = ifa->tmp_next;
2336 ifa->tmp_next = NULL;
2337 ifa->dead = 1;
2338 write_unlock_bh(&idev->lock);
2339 spin_lock_bh(&ifa->lock);
2340
2341 if (ifa->ifpub) {
2342 in6_ifa_put(ifa->ifpub);
2343 ifa->ifpub = NULL;
2344 }
2345 spin_unlock_bh(&ifa->lock);
2346 in6_ifa_put(ifa);
2347 write_lock_bh(&idev->lock);
2348 }
2349 #endif
2350 while ((ifa = idev->addr_list) != NULL) {
2351 idev->addr_list = ifa->if_next;
2352 ifa->if_next = NULL;
2353 ifa->dead = 1;
2354 addrconf_del_timer(ifa);
2355 write_unlock_bh(&idev->lock);
2356
2357 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2358 in6_ifa_put(ifa);
2359
2360 write_lock_bh(&idev->lock);
2361 }
2362 write_unlock_bh(&idev->lock);
2363
2364 /* Step 5: Discard multicast list */
2365
2366 if (how == 1)
2367 ipv6_mc_destroy_dev(idev);
2368 else
2369 ipv6_mc_down(idev);
2370
2371 /* Step 5: netlink notification of this interface */
2372 idev->tstamp = jiffies;
2373 inet6_ifinfo_notify(RTM_DELLINK, idev);
2374
2375 /* Shot the device (if unregistered) */
2376
2377 if (how == 1) {
2378 #ifdef CONFIG_SYSCTL
2379 addrconf_sysctl_unregister(&idev->cnf);
2380 neigh_sysctl_unregister(idev->nd_parms);
2381 #endif
2382 neigh_parms_release(&nd_tbl, idev->nd_parms);
2383 neigh_ifdown(&nd_tbl, dev);
2384 in6_dev_put(idev);
2385 }
2386 return 0;
2387 }
2388
2389 static void addrconf_rs_timer(unsigned long data)
2390 {
2391 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2392
2393 if (ifp->idev->cnf.forwarding)
2394 goto out;
2395
2396 if (ifp->idev->if_flags & IF_RA_RCVD) {
2397 /*
2398 * Announcement received after solicitation
2399 * was sent
2400 */
2401 goto out;
2402 }
2403
2404 spin_lock(&ifp->lock);
2405 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2406 struct in6_addr all_routers;
2407
2408 /* The wait after the last probe can be shorter */
2409 addrconf_mod_timer(ifp, AC_RS,
2410 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2411 ifp->idev->cnf.rtr_solicit_delay :
2412 ifp->idev->cnf.rtr_solicit_interval);
2413 spin_unlock(&ifp->lock);
2414
2415 ipv6_addr_all_routers(&all_routers);
2416
2417 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2418 } else {
2419 spin_unlock(&ifp->lock);
2420 /*
2421 * Note: we do not support deprecated "all on-link"
2422 * assumption any longer.
2423 */
2424 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2425 ifp->idev->dev->name);
2426 }
2427
2428 out:
2429 in6_ifa_put(ifp);
2430 }
2431
2432 /*
2433 * Duplicate Address Detection
2434 */
2435 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2436 {
2437 unsigned long rand_num;
2438 struct inet6_dev *idev = ifp->idev;
2439
2440 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2441 ifp->probes = idev->cnf.dad_transmits;
2442 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2443 }
2444
2445 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2446 {
2447 struct inet6_dev *idev = ifp->idev;
2448 struct net_device *dev = idev->dev;
2449
2450 addrconf_join_solict(dev, &ifp->addr);
2451
2452 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2453 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2454 flags);
2455
2456 net_srandom(ifp->addr.s6_addr32[3]);
2457
2458 read_lock_bh(&idev->lock);
2459 if (ifp->dead)
2460 goto out;
2461 spin_lock_bh(&ifp->lock);
2462
2463 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2464 !(ifp->flags&IFA_F_TENTATIVE)) {
2465 ifp->flags &= ~IFA_F_TENTATIVE;
2466 spin_unlock_bh(&ifp->lock);
2467 read_unlock_bh(&idev->lock);
2468
2469 addrconf_dad_completed(ifp);
2470 return;
2471 }
2472
2473 if (!(idev->if_flags & IF_READY)) {
2474 spin_unlock_bh(&ifp->lock);
2475 read_unlock_bh(&idev->lock);
2476 /*
2477 * If the defice is not ready:
2478 * - keep it tentative if it is a permanent address.
2479 * - otherwise, kill it.
2480 */
2481 in6_ifa_hold(ifp);
2482 addrconf_dad_stop(ifp);
2483 return;
2484 }
2485 addrconf_dad_kick(ifp);
2486 spin_unlock_bh(&ifp->lock);
2487 out:
2488 read_unlock_bh(&idev->lock);
2489 }
2490
2491 static void addrconf_dad_timer(unsigned long data)
2492 {
2493 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2494 struct inet6_dev *idev = ifp->idev;
2495 struct in6_addr unspec;
2496 struct in6_addr mcaddr;
2497
2498 read_lock_bh(&idev->lock);
2499 if (idev->dead) {
2500 read_unlock_bh(&idev->lock);
2501 goto out;
2502 }
2503 spin_lock_bh(&ifp->lock);
2504 if (ifp->probes == 0) {
2505 /*
2506 * DAD was successful
2507 */
2508
2509 ifp->flags &= ~IFA_F_TENTATIVE;
2510 spin_unlock_bh(&ifp->lock);
2511 read_unlock_bh(&idev->lock);
2512
2513 addrconf_dad_completed(ifp);
2514
2515 goto out;
2516 }
2517
2518 ifp->probes--;
2519 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2520 spin_unlock_bh(&ifp->lock);
2521 read_unlock_bh(&idev->lock);
2522
2523 /* send a neighbour solicitation for our addr */
2524 memset(&unspec, 0, sizeof(unspec));
2525 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2526 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2527 out:
2528 in6_ifa_put(ifp);
2529 }
2530
2531 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2532 {
2533 struct net_device * dev = ifp->idev->dev;
2534
2535 /*
2536 * Configure the address for reception. Now it is valid.
2537 */
2538
2539 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2540
2541 /* If added prefix is link local and forwarding is off,
2542 start sending router solicitations.
2543 */
2544
2545 if (ifp->idev->cnf.forwarding == 0 &&
2546 ifp->idev->cnf.rtr_solicits > 0 &&
2547 (dev->flags&IFF_LOOPBACK) == 0 &&
2548 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2549 struct in6_addr all_routers;
2550
2551 ipv6_addr_all_routers(&all_routers);
2552
2553 /*
2554 * If a host as already performed a random delay
2555 * [...] as part of DAD [...] there is no need
2556 * to delay again before sending the first RS
2557 */
2558 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2559
2560 spin_lock_bh(&ifp->lock);
2561 ifp->probes = 1;
2562 ifp->idev->if_flags |= IF_RS_SENT;
2563 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2564 spin_unlock_bh(&ifp->lock);
2565 }
2566 }
2567
2568 static void addrconf_dad_run(struct inet6_dev *idev) {
2569 struct inet6_ifaddr *ifp;
2570
2571 read_lock_bh(&idev->lock);
2572 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2573 spin_lock_bh(&ifp->lock);
2574 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2575 spin_unlock_bh(&ifp->lock);
2576 continue;
2577 }
2578 spin_unlock_bh(&ifp->lock);
2579 addrconf_dad_kick(ifp);
2580 }
2581 read_unlock_bh(&idev->lock);
2582 }
2583
2584 #ifdef CONFIG_PROC_FS
2585 struct if6_iter_state {
2586 int bucket;
2587 };
2588
2589 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2590 {
2591 struct inet6_ifaddr *ifa = NULL;
2592 struct if6_iter_state *state = seq->private;
2593
2594 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2595 ifa = inet6_addr_lst[state->bucket];
2596 if (ifa)
2597 break;
2598 }
2599 return ifa;
2600 }
2601
2602 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2603 {
2604 struct if6_iter_state *state = seq->private;
2605
2606 ifa = ifa->lst_next;
2607 try_again:
2608 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2609 ifa = inet6_addr_lst[state->bucket];
2610 goto try_again;
2611 }
2612 return ifa;
2613 }
2614
2615 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2616 {
2617 struct inet6_ifaddr *ifa = if6_get_first(seq);
2618
2619 if (ifa)
2620 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2621 --pos;
2622 return pos ? NULL : ifa;
2623 }
2624
2625 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2626 {
2627 read_lock_bh(&addrconf_hash_lock);
2628 return if6_get_idx(seq, *pos);
2629 }
2630
2631 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2632 {
2633 struct inet6_ifaddr *ifa;
2634
2635 ifa = if6_get_next(seq, v);
2636 ++*pos;
2637 return ifa;
2638 }
2639
2640 static void if6_seq_stop(struct seq_file *seq, void *v)
2641 {
2642 read_unlock_bh(&addrconf_hash_lock);
2643 }
2644
2645 static int if6_seq_show(struct seq_file *seq, void *v)
2646 {
2647 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2648 seq_printf(seq,
2649 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2650 NIP6(ifp->addr),
2651 ifp->idev->dev->ifindex,
2652 ifp->prefix_len,
2653 ifp->scope,
2654 ifp->flags,
2655 ifp->idev->dev->name);
2656 return 0;
2657 }
2658
2659 static struct seq_operations if6_seq_ops = {
2660 .start = if6_seq_start,
2661 .next = if6_seq_next,
2662 .show = if6_seq_show,
2663 .stop = if6_seq_stop,
2664 };
2665
2666 static int if6_seq_open(struct inode *inode, struct file *file)
2667 {
2668 struct seq_file *seq;
2669 int rc = -ENOMEM;
2670 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2671
2672 if (!s)
2673 goto out;
2674
2675 rc = seq_open(file, &if6_seq_ops);
2676 if (rc)
2677 goto out_kfree;
2678
2679 seq = file->private_data;
2680 seq->private = s;
2681 out:
2682 return rc;
2683 out_kfree:
2684 kfree(s);
2685 goto out;
2686 }
2687
2688 static struct file_operations if6_fops = {
2689 .owner = THIS_MODULE,
2690 .open = if6_seq_open,
2691 .read = seq_read,
2692 .llseek = seq_lseek,
2693 .release = seq_release_private,
2694 };
2695
2696 int __init if6_proc_init(void)
2697 {
2698 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2699 return -ENOMEM;
2700 return 0;
2701 }
2702
2703 void if6_proc_exit(void)
2704 {
2705 proc_net_remove("if_inet6");
2706 }
2707 #endif /* CONFIG_PROC_FS */
2708
2709 /*
2710 * Periodic address status verification
2711 */
2712
2713 static void addrconf_verify(unsigned long foo)
2714 {
2715 struct inet6_ifaddr *ifp;
2716 unsigned long now, next;
2717 int i;
2718
2719 spin_lock_bh(&addrconf_verify_lock);
2720 now = jiffies;
2721 next = now + ADDR_CHECK_FREQUENCY;
2722
2723 del_timer(&addr_chk_timer);
2724
2725 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2726
2727 restart:
2728 read_lock(&addrconf_hash_lock);
2729 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2730 unsigned long age;
2731 #ifdef CONFIG_IPV6_PRIVACY
2732 unsigned long regen_advance;
2733 #endif
2734
2735 if (ifp->flags & IFA_F_PERMANENT)
2736 continue;
2737
2738 spin_lock(&ifp->lock);
2739 age = (now - ifp->tstamp) / HZ;
2740
2741 #ifdef CONFIG_IPV6_PRIVACY
2742 regen_advance = ifp->idev->cnf.regen_max_retry *
2743 ifp->idev->cnf.dad_transmits *
2744 ifp->idev->nd_parms->retrans_time / HZ;
2745 #endif
2746
2747 if (age >= ifp->valid_lft) {
2748 spin_unlock(&ifp->lock);
2749 in6_ifa_hold(ifp);
2750 read_unlock(&addrconf_hash_lock);
2751 ipv6_del_addr(ifp);
2752 goto restart;
2753 } else if (age >= ifp->prefered_lft) {
2754 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2755 int deprecate = 0;
2756
2757 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2758 deprecate = 1;
2759 ifp->flags |= IFA_F_DEPRECATED;
2760 }
2761
2762 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2763 next = ifp->tstamp + ifp->valid_lft * HZ;
2764
2765 spin_unlock(&ifp->lock);
2766
2767 if (deprecate) {
2768 in6_ifa_hold(ifp);
2769 read_unlock(&addrconf_hash_lock);
2770
2771 ipv6_ifa_notify(0, ifp);
2772 in6_ifa_put(ifp);
2773 goto restart;
2774 }
2775 #ifdef CONFIG_IPV6_PRIVACY
2776 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2777 !(ifp->flags&IFA_F_TENTATIVE)) {
2778 if (age >= ifp->prefered_lft - regen_advance) {
2779 struct inet6_ifaddr *ifpub = ifp->ifpub;
2780 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2781 next = ifp->tstamp + ifp->prefered_lft * HZ;
2782 if (!ifp->regen_count && ifpub) {
2783 ifp->regen_count++;
2784 in6_ifa_hold(ifp);
2785 in6_ifa_hold(ifpub);
2786 spin_unlock(&ifp->lock);
2787 read_unlock(&addrconf_hash_lock);
2788 spin_lock(&ifpub->lock);
2789 ifpub->regen_count = 0;
2790 spin_unlock(&ifpub->lock);
2791 ipv6_create_tempaddr(ifpub, ifp);
2792 in6_ifa_put(ifpub);
2793 in6_ifa_put(ifp);
2794 goto restart;
2795 }
2796 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2797 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2798 spin_unlock(&ifp->lock);
2799 #endif
2800 } else {
2801 /* ifp->prefered_lft <= ifp->valid_lft */
2802 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2803 next = ifp->tstamp + ifp->prefered_lft * HZ;
2804 spin_unlock(&ifp->lock);
2805 }
2806 }
2807 read_unlock(&addrconf_hash_lock);
2808 }
2809
2810 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2811 add_timer(&addr_chk_timer);
2812 spin_unlock_bh(&addrconf_verify_lock);
2813 }
2814
2815 static int
2816 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2817 {
2818 struct rtattr **rta = arg;
2819 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2820 struct in6_addr *pfx;
2821
2822 pfx = NULL;
2823 if (rta[IFA_ADDRESS-1]) {
2824 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2825 return -EINVAL;
2826 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2827 }
2828 if (rta[IFA_LOCAL-1]) {
2829 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2830 return -EINVAL;
2831 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2832 }
2833 if (pfx == NULL)
2834 return -EINVAL;
2835
2836 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2837 }
2838
2839 static int
2840 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2841 {
2842 struct rtattr **rta = arg;
2843 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2844 struct in6_addr *pfx;
2845
2846 pfx = NULL;
2847 if (rta[IFA_ADDRESS-1]) {
2848 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2849 return -EINVAL;
2850 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2851 }
2852 if (rta[IFA_LOCAL-1]) {
2853 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2854 return -EINVAL;
2855 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2856 }
2857 if (pfx == NULL)
2858 return -EINVAL;
2859
2860 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2861 }
2862
2863 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
2864 u32 pid, u32 seq, int event, unsigned int flags)
2865 {
2866 struct ifaddrmsg *ifm;
2867 struct nlmsghdr *nlh;
2868 struct ifa_cacheinfo ci;
2869 unsigned char *b = skb->tail;
2870
2871 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2872 ifm = NLMSG_DATA(nlh);
2873 ifm->ifa_family = AF_INET6;
2874 ifm->ifa_prefixlen = ifa->prefix_len;
2875 ifm->ifa_flags = ifa->flags;
2876 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2877 if (ifa->scope&IFA_HOST)
2878 ifm->ifa_scope = RT_SCOPE_HOST;
2879 else if (ifa->scope&IFA_LINK)
2880 ifm->ifa_scope = RT_SCOPE_LINK;
2881 else if (ifa->scope&IFA_SITE)
2882 ifm->ifa_scope = RT_SCOPE_SITE;
2883 ifm->ifa_index = ifa->idev->dev->ifindex;
2884 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2885 if (!(ifa->flags&IFA_F_PERMANENT)) {
2886 ci.ifa_prefered = ifa->prefered_lft;
2887 ci.ifa_valid = ifa->valid_lft;
2888 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2889 long tval = (jiffies - ifa->tstamp)/HZ;
2890 ci.ifa_prefered -= tval;
2891 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2892 ci.ifa_valid -= tval;
2893 }
2894 } else {
2895 ci.ifa_prefered = INFINITY_LIFE_TIME;
2896 ci.ifa_valid = INFINITY_LIFE_TIME;
2897 }
2898 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2899 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2900 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2901 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2902 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2903 nlh->nlmsg_len = skb->tail - b;
2904 return skb->len;
2905
2906 nlmsg_failure:
2907 rtattr_failure:
2908 skb_trim(skb, b - skb->data);
2909 return -1;
2910 }
2911
2912 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
2913 u32 pid, u32 seq, int event, u16 flags)
2914 {
2915 struct ifaddrmsg *ifm;
2916 struct nlmsghdr *nlh;
2917 struct ifa_cacheinfo ci;
2918 unsigned char *b = skb->tail;
2919
2920 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2921 ifm = NLMSG_DATA(nlh);
2922 ifm->ifa_family = AF_INET6;
2923 ifm->ifa_prefixlen = 128;
2924 ifm->ifa_flags = IFA_F_PERMANENT;
2925 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2926 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2927 ifm->ifa_scope = RT_SCOPE_SITE;
2928 ifm->ifa_index = ifmca->idev->dev->ifindex;
2929 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2930 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2931 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2932 * 100 / HZ);
2933 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2934 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2935 * 100 / HZ);
2936 ci.ifa_prefered = INFINITY_LIFE_TIME;
2937 ci.ifa_valid = INFINITY_LIFE_TIME;
2938 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2939 nlh->nlmsg_len = skb->tail - b;
2940 return skb->len;
2941
2942 nlmsg_failure:
2943 rtattr_failure:
2944 skb_trim(skb, b - skb->data);
2945 return -1;
2946 }
2947
2948 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
2949 u32 pid, u32 seq, int event, unsigned int flags)
2950 {
2951 struct ifaddrmsg *ifm;
2952 struct nlmsghdr *nlh;
2953 struct ifa_cacheinfo ci;
2954 unsigned char *b = skb->tail;
2955
2956 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
2957 ifm = NLMSG_DATA(nlh);
2958 ifm->ifa_family = AF_INET6;
2959 ifm->ifa_prefixlen = 128;
2960 ifm->ifa_flags = IFA_F_PERMANENT;
2961 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2962 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2963 ifm->ifa_scope = RT_SCOPE_SITE;
2964 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2965 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2966 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2967 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2968 * 100 / HZ);
2969 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2970 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2971 * 100 / HZ);
2972 ci.ifa_prefered = INFINITY_LIFE_TIME;
2973 ci.ifa_valid = INFINITY_LIFE_TIME;
2974 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2975 nlh->nlmsg_len = skb->tail - b;
2976 return skb->len;
2977
2978 nlmsg_failure:
2979 rtattr_failure:
2980 skb_trim(skb, b - skb->data);
2981 return -1;
2982 }
2983
2984 enum addr_type_t
2985 {
2986 UNICAST_ADDR,
2987 MULTICAST_ADDR,
2988 ANYCAST_ADDR,
2989 };
2990
2991 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2992 enum addr_type_t type)
2993 {
2994 int idx, ip_idx;
2995 int s_idx, s_ip_idx;
2996 int err = 1;
2997 struct net_device *dev;
2998 struct inet6_dev *idev = NULL;
2999 struct inet6_ifaddr *ifa;
3000 struct ifmcaddr6 *ifmca;
3001 struct ifacaddr6 *ifaca;
3002
3003 s_idx = cb->args[0];
3004 s_ip_idx = ip_idx = cb->args[1];
3005 read_lock(&dev_base_lock);
3006
3007 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3008 if (idx < s_idx)
3009 continue;
3010 if (idx > s_idx)
3011 s_ip_idx = 0;
3012 ip_idx = 0;
3013 if ((idev = in6_dev_get(dev)) == NULL)
3014 continue;
3015 read_lock_bh(&idev->lock);
3016 switch (type) {
3017 case UNICAST_ADDR:
3018 /* unicast address incl. temp addr */
3019 for (ifa = idev->addr_list; ifa;
3020 ifa = ifa->if_next, ip_idx++) {
3021 if (ip_idx < s_ip_idx)
3022 continue;
3023 if ((err = inet6_fill_ifaddr(skb, ifa,
3024 NETLINK_CB(cb->skb).pid,
3025 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3026 NLM_F_MULTI)) <= 0)
3027 goto done;
3028 }
3029 break;
3030 case MULTICAST_ADDR:
3031 /* multicast address */
3032 for (ifmca = idev->mc_list; ifmca;
3033 ifmca = ifmca->next, ip_idx++) {
3034 if (ip_idx < s_ip_idx)
3035 continue;
3036 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3037 NETLINK_CB(cb->skb).pid,
3038 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3039 NLM_F_MULTI)) <= 0)
3040 goto done;
3041 }
3042 break;
3043 case ANYCAST_ADDR:
3044 /* anycast address */
3045 for (ifaca = idev->ac_list; ifaca;
3046 ifaca = ifaca->aca_next, ip_idx++) {
3047 if (ip_idx < s_ip_idx)
3048 continue;
3049 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3050 NETLINK_CB(cb->skb).pid,
3051 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3052 NLM_F_MULTI)) <= 0)
3053 goto done;
3054 }
3055 break;
3056 default:
3057 break;
3058 }
3059 read_unlock_bh(&idev->lock);
3060 in6_dev_put(idev);
3061 }
3062 done:
3063 if (err <= 0) {
3064 read_unlock_bh(&idev->lock);
3065 in6_dev_put(idev);
3066 }
3067 read_unlock(&dev_base_lock);
3068 cb->args[0] = idx;
3069 cb->args[1] = ip_idx;
3070 return skb->len;
3071 }
3072
3073 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3074 {
3075 enum addr_type_t type = UNICAST_ADDR;
3076 return inet6_dump_addr(skb, cb, type);
3077 }
3078
3079 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3080 {
3081 enum addr_type_t type = MULTICAST_ADDR;
3082 return inet6_dump_addr(skb, cb, type);
3083 }
3084
3085
3086 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3087 {
3088 enum addr_type_t type = ANYCAST_ADDR;
3089 return inet6_dump_addr(skb, cb, type);
3090 }
3091
3092 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3093 {
3094 struct sk_buff *skb;
3095 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3096
3097 skb = alloc_skb(size, GFP_ATOMIC);
3098 if (!skb) {
3099 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
3100 return;
3101 }
3102 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
3103 kfree_skb(skb);
3104 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
3105 return;
3106 }
3107 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3108 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
3109 }
3110
3111 static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3112 __s32 *array, int bytes)
3113 {
3114 memset(array, 0, bytes);
3115 array[DEVCONF_FORWARDING] = cnf->forwarding;
3116 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3117 array[DEVCONF_MTU6] = cnf->mtu6;
3118 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3119 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3120 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3121 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3122 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3123 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3124 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3125 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3126 #ifdef CONFIG_IPV6_PRIVACY
3127 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3128 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3129 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3130 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3131 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3132 #endif
3133 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3134 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3135 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3136 #ifdef CONFIG_IPV6_ROUTER_PREF
3137 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3138 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3139 #ifdef CONFIV_IPV6_ROUTE_INFO
3140 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3141 #endif
3142 #endif
3143 }
3144
3145 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3146 u32 pid, u32 seq, int event, unsigned int flags)
3147 {
3148 struct net_device *dev = idev->dev;
3149 __s32 *array = NULL;
3150 struct ifinfomsg *r;
3151 struct nlmsghdr *nlh;
3152 unsigned char *b = skb->tail;
3153 struct rtattr *subattr;
3154 __u32 mtu = dev->mtu;
3155 struct ifla_cacheinfo ci;
3156
3157 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
3158 r = NLMSG_DATA(nlh);
3159 r->ifi_family = AF_INET6;
3160 r->__ifi_pad = 0;
3161 r->ifi_type = dev->type;
3162 r->ifi_index = dev->ifindex;
3163 r->ifi_flags = dev_get_flags(dev);
3164 r->ifi_change = 0;
3165
3166 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3167
3168 if (dev->addr_len)
3169 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3170
3171 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3172 if (dev->ifindex != dev->iflink)
3173 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3174
3175 subattr = (struct rtattr*)skb->tail;
3176
3177 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3178
3179 /* return the device flags */
3180 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3181
3182 /* return interface cacheinfo */
3183 ci.max_reasm_len = IPV6_MAXPLEN;
3184 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3185 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3186 ci.reachable_time = idev->nd_parms->reachable_time;
3187 ci.retrans_time = idev->nd_parms->retrans_time;
3188 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3189
3190 /* return the device sysctl params */
3191 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3192 goto rtattr_failure;
3193 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3194 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3195
3196 /* XXX - Statistics/MC not implemented */
3197 subattr->rta_len = skb->tail - (u8*)subattr;
3198
3199 nlh->nlmsg_len = skb->tail - b;
3200 kfree(array);
3201 return skb->len;
3202
3203 nlmsg_failure:
3204 rtattr_failure:
3205 kfree(array);
3206 skb_trim(skb, b - skb->data);
3207 return -1;
3208 }
3209
3210 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3211 {
3212 int idx, err;
3213 int s_idx = cb->args[0];
3214 struct net_device *dev;
3215 struct inet6_dev *idev;
3216
3217 read_lock(&dev_base_lock);
3218 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3219 if (idx < s_idx)
3220 continue;
3221 if ((idev = in6_dev_get(dev)) == NULL)
3222 continue;
3223 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3224 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3225 in6_dev_put(idev);
3226 if (err <= 0)
3227 break;
3228 }
3229 read_unlock(&dev_base_lock);
3230 cb->args[0] = idx;
3231
3232 return skb->len;
3233 }
3234
3235 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3236 {
3237 struct sk_buff *skb;
3238 /* 128 bytes ?? */
3239 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3240
3241 skb = alloc_skb(size, GFP_ATOMIC);
3242 if (!skb) {
3243 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
3244 return;
3245 }
3246 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
3247 kfree_skb(skb);
3248 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
3249 return;
3250 }
3251 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3252 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
3253 }
3254
3255 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3256 struct prefix_info *pinfo, u32 pid, u32 seq,
3257 int event, unsigned int flags)
3258 {
3259 struct prefixmsg *pmsg;
3260 struct nlmsghdr *nlh;
3261 unsigned char *b = skb->tail;
3262 struct prefix_cacheinfo ci;
3263
3264 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
3265 pmsg = NLMSG_DATA(nlh);
3266 pmsg->prefix_family = AF_INET6;
3267 pmsg->prefix_pad1 = 0;
3268 pmsg->prefix_pad2 = 0;
3269 pmsg->prefix_ifindex = idev->dev->ifindex;
3270 pmsg->prefix_len = pinfo->prefix_len;
3271 pmsg->prefix_type = pinfo->type;
3272 pmsg->prefix_pad3 = 0;
3273
3274 pmsg->prefix_flags = 0;
3275 if (pinfo->onlink)
3276 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3277 if (pinfo->autoconf)
3278 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3279
3280 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3281
3282 ci.preferred_time = ntohl(pinfo->prefered);
3283 ci.valid_time = ntohl(pinfo->valid);
3284 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3285
3286 nlh->nlmsg_len = skb->tail - b;
3287 return skb->len;
3288
3289 nlmsg_failure:
3290 rtattr_failure:
3291 skb_trim(skb, b - skb->data);
3292 return -1;
3293 }
3294
3295 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3296 struct prefix_info *pinfo)
3297 {
3298 struct sk_buff *skb;
3299 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3300
3301 skb = alloc_skb(size, GFP_ATOMIC);
3302 if (!skb) {
3303 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
3304 return;
3305 }
3306 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
3307 kfree_skb(skb);
3308 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
3309 return;
3310 }
3311 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3312 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
3313 }
3314
3315 static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
3316 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3317 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3318 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3319 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3320 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3321 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3322 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3323 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3324 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3325 .dumpit = inet6_dump_fib, },
3326 };
3327
3328 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3329 {
3330 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3331
3332 switch (event) {
3333 case RTM_NEWADDR:
3334 ip6_ins_rt(ifp->rt, NULL, NULL, NULL);
3335 if (ifp->idev->cnf.forwarding)
3336 addrconf_join_anycast(ifp);
3337 break;
3338 case RTM_DELADDR:
3339 if (ifp->idev->cnf.forwarding)
3340 addrconf_leave_anycast(ifp);
3341 addrconf_leave_solict(ifp->idev, &ifp->addr);
3342 dst_hold(&ifp->rt->u.dst);
3343 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
3344 dst_free(&ifp->rt->u.dst);
3345 break;
3346 }
3347 }
3348
3349 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3350 {
3351 read_lock_bh(&addrconf_lock);
3352 if (likely(ifp->idev->dead == 0))
3353 __ipv6_ifa_notify(event, ifp);
3354 read_unlock_bh(&addrconf_lock);
3355 }
3356
3357 #ifdef CONFIG_SYSCTL
3358
3359 static
3360 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3361 void __user *buffer, size_t *lenp, loff_t *ppos)
3362 {
3363 int *valp = ctl->data;
3364 int val = *valp;
3365 int ret;
3366
3367 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3368
3369 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3370 if (valp != &ipv6_devconf.forwarding) {
3371 if ((!*valp) ^ (!val)) {
3372 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3373 if (idev == NULL)
3374 return ret;
3375 dev_forward_change(idev);
3376 }
3377 } else {
3378 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3379 addrconf_forward_change();
3380 }
3381 if (*valp)
3382 rt6_purge_dflt_routers();
3383 }
3384
3385 return ret;
3386 }
3387
3388 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3389 int __user *name, int nlen,
3390 void __user *oldval,
3391 size_t __user *oldlenp,
3392 void __user *newval, size_t newlen,
3393 void **context)
3394 {
3395 int *valp = table->data;
3396 int new;
3397
3398 if (!newval || !newlen)
3399 return 0;
3400 if (newlen != sizeof(int))
3401 return -EINVAL;
3402 if (get_user(new, (int __user *)newval))
3403 return -EFAULT;
3404 if (new == *valp)
3405 return 0;
3406 if (oldval && oldlenp) {
3407 size_t len;
3408 if (get_user(len, oldlenp))
3409 return -EFAULT;
3410 if (len) {
3411 if (len > table->maxlen)
3412 len = table->maxlen;
3413 if (copy_to_user(oldval, valp, len))
3414 return -EFAULT;
3415 if (put_user(len, oldlenp))
3416 return -EFAULT;
3417 }
3418 }
3419
3420 if (valp != &ipv6_devconf_dflt.forwarding) {
3421 if (valp != &ipv6_devconf.forwarding) {
3422 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3423 int changed;
3424 if (unlikely(idev == NULL))
3425 return -ENODEV;
3426 changed = (!*valp) ^ (!new);
3427 *valp = new;
3428 if (changed)
3429 dev_forward_change(idev);
3430 } else {
3431 *valp = new;
3432 addrconf_forward_change();
3433 }
3434
3435 if (*valp)
3436 rt6_purge_dflt_routers();
3437 } else
3438 *valp = new;
3439
3440 return 1;
3441 }
3442
3443 static struct addrconf_sysctl_table
3444 {
3445 struct ctl_table_header *sysctl_header;
3446 ctl_table addrconf_vars[__NET_IPV6_MAX];
3447 ctl_table addrconf_dev[2];
3448 ctl_table addrconf_conf_dir[2];
3449 ctl_table addrconf_proto_dir[2];
3450 ctl_table addrconf_root_dir[2];
3451 } addrconf_sysctl = {
3452 .sysctl_header = NULL,
3453 .addrconf_vars = {
3454 {
3455 .ctl_name = NET_IPV6_FORWARDING,
3456 .procname = "forwarding",
3457 .data = &ipv6_devconf.forwarding,
3458 .maxlen = sizeof(int),
3459 .mode = 0644,
3460 .proc_handler = &addrconf_sysctl_forward,
3461 .strategy = &addrconf_sysctl_forward_strategy,
3462 },
3463 {
3464 .ctl_name = NET_IPV6_HOP_LIMIT,
3465 .procname = "hop_limit",
3466 .data = &ipv6_devconf.hop_limit,
3467 .maxlen = sizeof(int),
3468 .mode = 0644,
3469 .proc_handler = proc_dointvec,
3470 },
3471 {
3472 .ctl_name = NET_IPV6_MTU,
3473 .procname = "mtu",
3474 .data = &ipv6_devconf.mtu6,
3475 .maxlen = sizeof(int),
3476 .mode = 0644,
3477 .proc_handler = &proc_dointvec,
3478 },
3479 {
3480 .ctl_name = NET_IPV6_ACCEPT_RA,
3481 .procname = "accept_ra",
3482 .data = &ipv6_devconf.accept_ra,
3483 .maxlen = sizeof(int),
3484 .mode = 0644,
3485 .proc_handler = &proc_dointvec,
3486 },
3487 {
3488 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3489 .procname = "accept_redirects",
3490 .data = &ipv6_devconf.accept_redirects,
3491 .maxlen = sizeof(int),
3492 .mode = 0644,
3493 .proc_handler = &proc_dointvec,
3494 },
3495 {
3496 .ctl_name = NET_IPV6_AUTOCONF,
3497 .procname = "autoconf",
3498 .data = &ipv6_devconf.autoconf,
3499 .maxlen = sizeof(int),
3500 .mode = 0644,
3501 .proc_handler = &proc_dointvec,
3502 },
3503 {
3504 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3505 .procname = "dad_transmits",
3506 .data = &ipv6_devconf.dad_transmits,
3507 .maxlen = sizeof(int),
3508 .mode = 0644,
3509 .proc_handler = &proc_dointvec,
3510 },
3511 {
3512 .ctl_name = NET_IPV6_RTR_SOLICITS,
3513 .procname = "router_solicitations",
3514 .data = &ipv6_devconf.rtr_solicits,
3515 .maxlen = sizeof(int),
3516 .mode = 0644,
3517 .proc_handler = &proc_dointvec,
3518 },
3519 {
3520 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3521 .procname = "router_solicitation_interval",
3522 .data = &ipv6_devconf.rtr_solicit_interval,
3523 .maxlen = sizeof(int),
3524 .mode = 0644,
3525 .proc_handler = &proc_dointvec_jiffies,
3526 .strategy = &sysctl_jiffies,
3527 },
3528 {
3529 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3530 .procname = "router_solicitation_delay",
3531 .data = &ipv6_devconf.rtr_solicit_delay,
3532 .maxlen = sizeof(int),
3533 .mode = 0644,
3534 .proc_handler = &proc_dointvec_jiffies,
3535 .strategy = &sysctl_jiffies,
3536 },
3537 {
3538 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3539 .procname = "force_mld_version",
3540 .data = &ipv6_devconf.force_mld_version,
3541 .maxlen = sizeof(int),
3542 .mode = 0644,
3543 .proc_handler = &proc_dointvec,
3544 },
3545 #ifdef CONFIG_IPV6_PRIVACY
3546 {
3547 .ctl_name = NET_IPV6_USE_TEMPADDR,
3548 .procname = "use_tempaddr",
3549 .data = &ipv6_devconf.use_tempaddr,
3550 .maxlen = sizeof(int),
3551 .mode = 0644,
3552 .proc_handler = &proc_dointvec,
3553 },
3554 {
3555 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3556 .procname = "temp_valid_lft",
3557 .data = &ipv6_devconf.temp_valid_lft,
3558 .maxlen = sizeof(int),
3559 .mode = 0644,
3560 .proc_handler = &proc_dointvec,
3561 },
3562 {
3563 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3564 .procname = "temp_prefered_lft",
3565 .data = &ipv6_devconf.temp_prefered_lft,
3566 .maxlen = sizeof(int),
3567 .mode = 0644,
3568 .proc_handler = &proc_dointvec,
3569 },
3570 {
3571 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3572 .procname = "regen_max_retry",
3573 .data = &ipv6_devconf.regen_max_retry,
3574 .maxlen = sizeof(int),
3575 .mode = 0644,
3576 .proc_handler = &proc_dointvec,
3577 },
3578 {
3579 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3580 .procname = "max_desync_factor",
3581 .data = &ipv6_devconf.max_desync_factor,
3582 .maxlen = sizeof(int),
3583 .mode = 0644,
3584 .proc_handler = &proc_dointvec,
3585 },
3586 #endif
3587 {
3588 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3589 .procname = "max_addresses",
3590 .data = &ipv6_devconf.max_addresses,
3591 .maxlen = sizeof(int),
3592 .mode = 0644,
3593 .proc_handler = &proc_dointvec,
3594 },
3595 {
3596 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3597 .procname = "accept_ra_defrtr",
3598 .data = &ipv6_devconf.accept_ra_defrtr,
3599 .maxlen = sizeof(int),
3600 .mode = 0644,
3601 .proc_handler = &proc_dointvec,
3602 },
3603 {
3604 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3605 .procname = "accept_ra_pinfo",
3606 .data = &ipv6_devconf.accept_ra_pinfo,
3607 .maxlen = sizeof(int),
3608 .mode = 0644,
3609 .proc_handler = &proc_dointvec,
3610 },
3611 #ifdef CONFIG_IPV6_ROUTER_PREF
3612 {
3613 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3614 .procname = "accept_ra_rtr_pref",
3615 .data = &ipv6_devconf.accept_ra_rtr_pref,
3616 .maxlen = sizeof(int),
3617 .mode = 0644,
3618 .proc_handler = &proc_dointvec,
3619 },
3620 {
3621 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3622 .procname = "router_probe_interval",
3623 .data = &ipv6_devconf.rtr_probe_interval,
3624 .maxlen = sizeof(int),
3625 .mode = 0644,
3626 .proc_handler = &proc_dointvec_jiffies,
3627 .strategy = &sysctl_jiffies,
3628 },
3629 #ifdef CONFIV_IPV6_ROUTE_INFO
3630 {
3631 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3632 .procname = "accept_ra_rt_info_max_plen",
3633 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3634 .maxlen = sizeof(int),
3635 .mode = 0644,
3636 .proc_handler = &proc_dointvec,
3637 },
3638 #endif
3639 #endif
3640 {
3641 .ctl_name = 0, /* sentinel */
3642 }
3643 },
3644 .addrconf_dev = {
3645 {
3646 .ctl_name = NET_PROTO_CONF_ALL,
3647 .procname = "all",
3648 .mode = 0555,
3649 .child = addrconf_sysctl.addrconf_vars,
3650 },
3651 {
3652 .ctl_name = 0, /* sentinel */
3653 }
3654 },
3655 .addrconf_conf_dir = {
3656 {
3657 .ctl_name = NET_IPV6_CONF,
3658 .procname = "conf",
3659 .mode = 0555,
3660 .child = addrconf_sysctl.addrconf_dev,
3661 },
3662 {
3663 .ctl_name = 0, /* sentinel */
3664 }
3665 },
3666 .addrconf_proto_dir = {
3667 {
3668 .ctl_name = NET_IPV6,
3669 .procname = "ipv6",
3670 .mode = 0555,
3671 .child = addrconf_sysctl.addrconf_conf_dir,
3672 },
3673 {
3674 .ctl_name = 0, /* sentinel */
3675 }
3676 },
3677 .addrconf_root_dir = {
3678 {
3679 .ctl_name = CTL_NET,
3680 .procname = "net",
3681 .mode = 0555,
3682 .child = addrconf_sysctl.addrconf_proto_dir,
3683 },
3684 {
3685 .ctl_name = 0, /* sentinel */
3686 }
3687 },
3688 };
3689
3690 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3691 {
3692 int i;
3693 struct net_device *dev = idev ? idev->dev : NULL;
3694 struct addrconf_sysctl_table *t;
3695 char *dev_name = NULL;
3696
3697 t = kmalloc(sizeof(*t), GFP_KERNEL);
3698 if (t == NULL)
3699 return;
3700 memcpy(t, &addrconf_sysctl, sizeof(*t));
3701 for (i=0; t->addrconf_vars[i].data; i++) {
3702 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3703 t->addrconf_vars[i].de = NULL;
3704 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3705 }
3706 if (dev) {
3707 dev_name = dev->name;
3708 t->addrconf_dev[0].ctl_name = dev->ifindex;
3709 } else {
3710 dev_name = "default";
3711 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3712 }
3713
3714 /*
3715 * Make a copy of dev_name, because '.procname' is regarded as const
3716 * by sysctl and we wouldn't want anyone to change it under our feet
3717 * (see SIOCSIFNAME).
3718 */
3719 dev_name = kstrdup(dev_name, GFP_KERNEL);
3720 if (!dev_name)
3721 goto free;
3722
3723 t->addrconf_dev[0].procname = dev_name;
3724
3725 t->addrconf_dev[0].child = t->addrconf_vars;
3726 t->addrconf_dev[0].de = NULL;
3727 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3728 t->addrconf_conf_dir[0].de = NULL;
3729 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3730 t->addrconf_proto_dir[0].de = NULL;
3731 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3732 t->addrconf_root_dir[0].de = NULL;
3733
3734 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3735 if (t->sysctl_header == NULL)
3736 goto free_procname;
3737 else
3738 p->sysctl = t;
3739 return;
3740
3741 /* error path */
3742 free_procname:
3743 kfree(dev_name);
3744 free:
3745 kfree(t);
3746
3747 return;
3748 }
3749
3750 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3751 {
3752 if (p->sysctl) {
3753 struct addrconf_sysctl_table *t = p->sysctl;
3754 p->sysctl = NULL;
3755 unregister_sysctl_table(t->sysctl_header);
3756 kfree(t->addrconf_dev[0].procname);
3757 kfree(t);
3758 }
3759 }
3760
3761
3762 #endif
3763
3764 /*
3765 * Device notifier
3766 */
3767
3768 int register_inet6addr_notifier(struct notifier_block *nb)
3769 {
3770 return atomic_notifier_chain_register(&inet6addr_chain, nb);
3771 }
3772
3773 int unregister_inet6addr_notifier(struct notifier_block *nb)
3774 {
3775 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
3776 }
3777
3778 /*
3779 * Init / cleanup code
3780 */
3781
3782 int __init addrconf_init(void)
3783 {
3784 int err = 0;
3785
3786 /* The addrconf netdev notifier requires that loopback_dev
3787 * has it's ipv6 private information allocated and setup
3788 * before it can bring up and give link-local addresses
3789 * to other devices which are up.
3790 *
3791 * Unfortunately, loopback_dev is not necessarily the first
3792 * entry in the global dev_base list of net devices. In fact,
3793 * it is likely to be the very last entry on that list.
3794 * So this causes the notifier registry below to try and
3795 * give link-local addresses to all devices besides loopback_dev
3796 * first, then loopback_dev, which cases all the non-loopback_dev
3797 * devices to fail to get a link-local address.
3798 *
3799 * So, as a temporary fix, allocate the ipv6 structure for
3800 * loopback_dev first by hand.
3801 * Longer term, all of the dependencies ipv6 has upon the loopback
3802 * device and it being up should be removed.
3803 */
3804 rtnl_lock();
3805 if (!ipv6_add_dev(&loopback_dev))
3806 err = -ENOMEM;
3807 rtnl_unlock();
3808 if (err)
3809 return err;
3810
3811 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3812
3813 register_netdevice_notifier(&ipv6_dev_notf);
3814
3815 addrconf_verify(0);
3816 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3817 #ifdef CONFIG_SYSCTL
3818 addrconf_sysctl.sysctl_header =
3819 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3820 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3821 #endif
3822
3823 return 0;
3824 }
3825
3826 void __exit addrconf_cleanup(void)
3827 {
3828 struct net_device *dev;
3829 struct inet6_dev *idev;
3830 struct inet6_ifaddr *ifa;
3831 int i;
3832
3833 unregister_netdevice_notifier(&ipv6_dev_notf);
3834
3835 rtnetlink_links[PF_INET6] = NULL;
3836 #ifdef CONFIG_SYSCTL
3837 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3838 addrconf_sysctl_unregister(&ipv6_devconf);
3839 #endif
3840
3841 rtnl_lock();
3842
3843 /*
3844 * clean dev list.
3845 */
3846
3847 for (dev=dev_base; dev; dev=dev->next) {
3848 if ((idev = __in6_dev_get(dev)) == NULL)
3849 continue;
3850 addrconf_ifdown(dev, 1);
3851 }
3852 addrconf_ifdown(&loopback_dev, 2);
3853
3854 /*
3855 * Check hash table.
3856 */
3857
3858 write_lock_bh(&addrconf_hash_lock);
3859 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3860 for (ifa=inet6_addr_lst[i]; ifa; ) {
3861 struct inet6_ifaddr *bifa;
3862
3863 bifa = ifa;
3864 ifa = ifa->lst_next;
3865 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3866 /* Do not free it; something is wrong.
3867 Now we can investigate it with debugger.
3868 */
3869 }
3870 }
3871 write_unlock_bh(&addrconf_hash_lock);
3872
3873 del_timer(&addr_chk_timer);
3874
3875 rtnl_unlock();
3876
3877 #ifdef CONFIG_PROC_FS
3878 proc_net_remove("if_inet6");
3879 #endif
3880 }
linux-next