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[IPV6]: Try not to send icmp to anycast address.
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 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.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
43#include <linux/config.h>
44#include <linux/errno.h>
45#include <linux/types.h>
46#include <linux/socket.h>
47#include <linux/sockios.h>
48#include <linux/sched.h>
49#include <linux/net.h>
50#include <linux/in6.h>
51#include <linux/netdevice.h>
52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
58#ifdef CONFIG_SYSCTL
59#include <linux/sysctl.h>
60#endif
61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4
LT		 64
65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
75#include <linux/if_tunnel.h>
76#include <linux/rtnetlink.h>
77
78#ifdef CONFIG_IPV6_PRIVACY
79#include <linux/random.h>
80#include <linux/crypto.h>
378f058c 81#include <linux/scatterlist.h>
1da177e4
LT		 82#endif
83
84#include <asm/uaccess.h>
85
86#include <linux/proc_fs.h>
87#include <linux/seq_file.h>
88
89/* Set to 3 to get tracing... */
90#define ACONF_DEBUG 2
91
92#if ACONF_DEBUG >= 3
93#define ADBG(x) printk x
94#else
95#define ADBG(x)
96#endif
97
98#define INFINITY_LIFE_TIME 0xFFFFFFFF
99#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101#ifdef CONFIG_SYSCTL
102static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104#endif
105
106#ifdef CONFIG_IPV6_PRIVACY
107static int __ipv6_regen_rndid(struct inet6_dev *idev);
108static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
109static void ipv6_regen_rndid(unsigned long data);
110
111static int desync_factor = MAX_DESYNC_FACTOR * HZ;
112static struct crypto_tfm *md5_tfm;
113static DEFINE_SPINLOCK(md5_tfm_lock);
114#endif
115
116static int ipv6_count_addresses(struct inet6_dev *idev);
117
118/*
119 * Configured unicast address hash table
120 */
121static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122static DEFINE_RWLOCK(addrconf_hash_lock);
123
124/* Protects inet6 devices */
125DEFINE_RWLOCK(addrconf_lock);
126
127static void addrconf_verify(unsigned long);
128
8d06afab 129static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 130static DEFINE_SPINLOCK(addrconf_verify_lock);
131
132static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
133static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
134
135static int addrconf_ifdown(struct net_device *dev, int how);
136
e431b8c0 137static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 138static void addrconf_dad_timer(unsigned long data);
139static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
140static void addrconf_rs_timer(unsigned long data);
141static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
142static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
143
144static void inet6_prefix_notify(int event, struct inet6_dev *idev,
145 struct prefix_info *pinfo);
146static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
147
148static struct notifier_block *inet6addr_chain;
149
150struct ipv6_devconf ipv6_devconf = {
151 .forwarding = 0,
152 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
153 .mtu6 = IPV6_MIN_MTU,
154 .accept_ra = 1,
155 .accept_redirects = 1,
156 .autoconf = 1,
157 .force_mld_version = 0,
158 .dad_transmits = 1,
159 .rtr_solicits = MAX_RTR_SOLICITATIONS,
160 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
161 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
162#ifdef CONFIG_IPV6_PRIVACY
163 .use_tempaddr = 0,
164 .temp_valid_lft = TEMP_VALID_LIFETIME,
165 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
166 .regen_max_retry = REGEN_MAX_RETRY,
167 .max_desync_factor = MAX_DESYNC_FACTOR,
168#endif
169 .max_addresses = IPV6_MAX_ADDRESSES,
170};
171
172static struct ipv6_devconf ipv6_devconf_dflt = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183#ifdef CONFIG_IPV6_PRIVACY
184 .use_tempaddr = 0,
185 .temp_valid_lft = TEMP_VALID_LIFETIME,
186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187 .regen_max_retry = REGEN_MAX_RETRY,
188 .max_desync_factor = MAX_DESYNC_FACTOR,
189#endif
190 .max_addresses = IPV6_MAX_ADDRESSES,
191};
192
193/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
194#if 0
195const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
196#endif
197const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
198
b1cacb68
YH		 199#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
200
201static inline unsigned ipv6_addr_scope2type(unsigned scope)
202{
203 switch(scope) {
204 case IPV6_ADDR_SCOPE_NODELOCAL:
205 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
206 IPV6_ADDR_LOOPBACK);
207 case IPV6_ADDR_SCOPE_LINKLOCAL:
208 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
209 IPV6_ADDR_LINKLOCAL);
210 case IPV6_ADDR_SCOPE_SITELOCAL:
211 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
212 IPV6_ADDR_SITELOCAL);
213 }
214 return IPV6_ADDR_SCOPE_TYPE(scope);
215}
216
217int __ipv6_addr_type(const struct in6_addr *addr)
1da177e4 218{
1da177e4
LT		 219 u32 st;
220
221 st = addr->s6_addr32[0];
222
1da177e4 223 /* Consider all addresses with the first three bits different of
b1cacb68 224 000 and 111 as unicasts.
1da177e4
LT		 225 */
226 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
227 (st & htonl(0xE0000000)) != htonl(0xE0000000))
b1cacb68
YH		 228 return (IPV6_ADDR_UNICAST |
229 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
1da177e4 230
b1cacb68
YH		 231 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
232 /* multicast */
233 /* addr-select 3.1 */
234 return (IPV6_ADDR_MULTICAST |
235 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
236 }
237
238 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
239 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
240 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
1da177e4 241 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
b1cacb68
YH		 242 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
243 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
1da177e4
LT		 244
245 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
246 if (addr->s6_addr32[2] == 0) {
247 if (addr->s6_addr32[3] == 0)
248 return IPV6_ADDR_ANY;
249
250 if (addr->s6_addr32[3] == htonl(0x00000001))
b1cacb68
YH		 251 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
252 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
1da177e4 253
b1cacb68
YH		 254 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
255 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
1da177e4
LT		 256 }
257
258 if (addr->s6_addr32[2] == htonl(0x0000ffff))
b1cacb68
YH		 259 return (IPV6_ADDR_MAPPED |
260 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
1da177e4
LT		 261 }
262
b1cacb68
YH		 263 return (IPV6_ADDR_RESERVED |
264 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
1da177e4
LT		 265}
266
267static void addrconf_del_timer(struct inet6_ifaddr *ifp)
268{
269 if (del_timer(&ifp->timer))
270 __in6_ifa_put(ifp);
271}
272
273enum addrconf_timer_t
274{
275 AC_NONE,
276 AC_DAD,
277 AC_RS,
278};
279
280static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
281 enum addrconf_timer_t what,
282 unsigned long when)
283{
284 if (!del_timer(&ifp->timer))
285 in6_ifa_hold(ifp);
286
287 switch (what) {
288 case AC_DAD:
289 ifp->timer.function = addrconf_dad_timer;
290 break;
291 case AC_RS:
292 ifp->timer.function = addrconf_rs_timer;
293 break;
294 default:;
295 }
296 ifp->timer.expires = jiffies + when;
297 add_timer(&ifp->timer);
298}
299
300/* Nobody refers to this device, we may destroy it. */
301
302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
316 kfree(idev);
317}
318
319static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
320{
321 struct inet6_dev *ndev;
322
323 ASSERT_RTNL();
324
325 if (dev->mtu < IPV6_MIN_MTU)
326 return NULL;
327
328 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
329
330 if (ndev) {
331 memset(ndev, 0, sizeof(struct inet6_dev));
332
333 rwlock_init(&ndev->lock);
334 ndev->dev = dev;
335 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
336 ndev->cnf.mtu6 = dev->mtu;
337 ndev->cnf.sysctl = NULL;
338 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
339 if (ndev->nd_parms == NULL) {
340 kfree(ndev);
341 return NULL;
342 }
343 /* We refer to the device */
344 dev_hold(dev);
345
346 if (snmp6_alloc_dev(ndev) < 0) {
347 ADBG((KERN_WARNING
348 "%s(): cannot allocate memory for statistics; dev=%s.\n",
349 __FUNCTION__, dev->name));
350 neigh_parms_release(&nd_tbl, ndev->nd_parms);
351 ndev->dead = 1;
352 in6_dev_finish_destroy(ndev);
353 return NULL;
354 }
355
356 if (snmp6_register_dev(ndev) < 0) {
357 ADBG((KERN_WARNING
358 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
359 __FUNCTION__, dev->name));
360 neigh_parms_release(&nd_tbl, ndev->nd_parms);
361 ndev->dead = 1;
362 in6_dev_finish_destroy(ndev);
363 return NULL;
364 }
365
366 /* One reference from device. We must do this before
367 * we invoke __ipv6_regen_rndid().
368 */
369 in6_dev_hold(ndev);
370
371#ifdef CONFIG_IPV6_PRIVACY
372 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
373 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
374 init_timer(&ndev->regen_timer);
375 ndev->regen_timer.function = ipv6_regen_rndid;
376 ndev->regen_timer.data = (unsigned long) ndev;
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
77bd9196 379 dev->type == ARPHRD_NONE ||
1da177e4
LT		 380 dev->type == ARPHRD_SIT) {
381 printk(KERN_INFO
a1493d9c
DM		 382 "%s: Disabled Privacy Extensions\n",
383 dev->name);
1da177e4
LT		 384 ndev->cnf.use_tempaddr = -1;
385 } else {
386 in6_dev_hold(ndev);
387 ipv6_regen_rndid((unsigned long) ndev);
388 }
389#endif
390
391 write_lock_bh(&addrconf_lock);
392 dev->ip6_ptr = ndev;
393 write_unlock_bh(&addrconf_lock);
394
395 ipv6_mc_init_dev(ndev);
396 ndev->tstamp = jiffies;
397#ifdef CONFIG_SYSCTL
398 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
399 NET_IPV6_NEIGH, "ipv6",
400 &ndisc_ifinfo_sysctl_change,
401 NULL);
402 addrconf_sysctl_register(ndev, &ndev->cnf);
403#endif
404 }
405 return ndev;
406}
407
408static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
409{
410 struct inet6_dev *idev;
411
412 ASSERT_RTNL();
413
414 if ((idev = __in6_dev_get(dev)) == NULL) {
415 if ((idev = ipv6_add_dev(dev)) == NULL)
416 return NULL;
417 }
418 if (dev->flags&IFF_UP)
419 ipv6_mc_up(idev);
420 return idev;
421}
422
423#ifdef CONFIG_SYSCTL
424static void dev_forward_change(struct inet6_dev *idev)
425{
426 struct net_device *dev;
427 struct inet6_ifaddr *ifa;
428 struct in6_addr addr;
429
430 if (!idev)
431 return;
432 dev = idev->dev;
433 if (dev && (dev->flags & IFF_MULTICAST)) {
434 ipv6_addr_all_routers(&addr);
435
436 if (idev->cnf.forwarding)
437 ipv6_dev_mc_inc(dev, &addr);
438 else
439 ipv6_dev_mc_dec(dev, &addr);
440 }
441 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
442 if (idev->cnf.forwarding)
443 addrconf_join_anycast(ifa);
444 else
445 addrconf_leave_anycast(ifa);
446 }
447}
448
449
450static void addrconf_forward_change(void)
451{
452 struct net_device *dev;
453 struct inet6_dev *idev;
454
455 read_lock(&dev_base_lock);
456 for (dev=dev_base; dev; dev=dev->next) {
457 read_lock(&addrconf_lock);
458 idev = __in6_dev_get(dev);
459 if (idev) {
460 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
461 idev->cnf.forwarding = ipv6_devconf.forwarding;
462 if (changed)
463 dev_forward_change(idev);
464 }
465 read_unlock(&addrconf_lock);
466 }
467 read_unlock(&dev_base_lock);
468}
469#endif
470
471/* Nobody refers to this ifaddr, destroy it */
472
473void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
474{
475 BUG_TRAP(ifp->if_next==NULL);
476 BUG_TRAP(ifp->lst_next==NULL);
477#ifdef NET_REFCNT_DEBUG
478 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
479#endif
480
481 in6_dev_put(ifp->idev);
482
483 if (del_timer(&ifp->timer))
484 printk("Timer is still running, when freeing ifa=%p\n", ifp);
485
486 if (!ifp->dead) {
487 printk("Freeing alive inet6 address %p\n", ifp);
488 return;
489 }
490 dst_release(&ifp->rt->u.dst);
491
492 kfree(ifp);
493}
494
495/* On success it returns ifp with increased reference count */
496
497static struct inet6_ifaddr *
498ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 499 int scope, u32 flags)
1da177e4
LT		 500{
501 struct inet6_ifaddr *ifa = NULL;
502 struct rt6_info *rt;
503 int hash;
504 int err = 0;
505
506 read_lock_bh(&addrconf_lock);
507 if (idev->dead) {
508 err = -ENODEV; /*XXX*/
509 goto out2;
510 }
511
512 write_lock(&addrconf_hash_lock);
513
514 /* Ignore adding duplicate addresses on an interface */
515 if (ipv6_chk_same_addr(addr, idev->dev)) {
516 ADBG(("ipv6_add_addr: already assigned\n"));
517 err = -EEXIST;
518 goto out;
519 }
520
521 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
522
523 if (ifa == NULL) {
524 ADBG(("ipv6_add_addr: malloc failed\n"));
525 err = -ENOBUFS;
526 goto out;
527 }
528
529 rt = addrconf_dst_alloc(idev, addr, 0);
530 if (IS_ERR(rt)) {
531 err = PTR_ERR(rt);
532 goto out;
533 }
534
535 memset(ifa, 0, sizeof(struct inet6_ifaddr));
536 ipv6_addr_copy(&ifa->addr, addr);
537
538 spin_lock_init(&ifa->lock);
539 init_timer(&ifa->timer);
540 ifa->timer.data = (unsigned long) ifa;
541 ifa->scope = scope;
542 ifa->prefix_len = pfxlen;
543 ifa->flags = flags | IFA_F_TENTATIVE;
544 ifa->cstamp = ifa->tstamp = jiffies;
545
546 ifa->idev = idev;
547 in6_dev_hold(idev);
548 /* For caller */
549 in6_ifa_hold(ifa);
550
551 /* Add to big hash table */
552 hash = ipv6_addr_hash(addr);
553
554 ifa->lst_next = inet6_addr_lst[hash];
555 inet6_addr_lst[hash] = ifa;
556 in6_ifa_hold(ifa);
557 write_unlock(&addrconf_hash_lock);
558
559 write_lock(&idev->lock);
560 /* Add to inet6_dev unicast addr list. */
561 ifa->if_next = idev->addr_list;
562 idev->addr_list = ifa;
563
564#ifdef CONFIG_IPV6_PRIVACY
565 if (ifa->flags&IFA_F_TEMPORARY) {
566 ifa->tmp_next = idev->tempaddr_list;
567 idev->tempaddr_list = ifa;
568 in6_ifa_hold(ifa);
569 }
570#endif
571
572 ifa->rt = rt;
573
574 in6_ifa_hold(ifa);
575 write_unlock(&idev->lock);
576out2:
577 read_unlock_bh(&addrconf_lock);
578
fd92833a 579 if (likely(err == 0))
1da177e4
LT		 580 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
581 else {
582 kfree(ifa);
583 ifa = ERR_PTR(err);
584 }
585
586 return ifa;
587out:
588 write_unlock(&addrconf_hash_lock);
589 goto out2;
590}
591
592/* This function wants to get referenced ifp and releases it before return */
593
594static void ipv6_del_addr(struct inet6_ifaddr *ifp)
595{
596 struct inet6_ifaddr *ifa, **ifap;
597 struct inet6_dev *idev = ifp->idev;
598 int hash;
599 int deleted = 0, onlink = 0;
600 unsigned long expires = jiffies;
601
602 hash = ipv6_addr_hash(&ifp->addr);
603
604 ifp->dead = 1;
605
606 write_lock_bh(&addrconf_hash_lock);
607 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
608 ifap = &ifa->lst_next) {
609 if (ifa == ifp) {
610 *ifap = ifa->lst_next;
611 __in6_ifa_put(ifp);
612 ifa->lst_next = NULL;
613 break;
614 }
615 }
616 write_unlock_bh(&addrconf_hash_lock);
617
618 write_lock_bh(&idev->lock);
619#ifdef CONFIG_IPV6_PRIVACY
620 if (ifp->flags&IFA_F_TEMPORARY) {
621 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
622 ifap = &ifa->tmp_next) {
623 if (ifa == ifp) {
624 *ifap = ifa->tmp_next;
625 if (ifp->ifpub) {
626 in6_ifa_put(ifp->ifpub);
627 ifp->ifpub = NULL;
628 }
629 __in6_ifa_put(ifp);
630 ifa->tmp_next = NULL;
631 break;
632 }
633 }
634 }
635#endif
636
637 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
638 ifap = &ifa->if_next) {
639 if (ifa == ifp) {
640 *ifap = ifa->if_next;
641 __in6_ifa_put(ifp);
642 ifa->if_next = NULL;
643 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
644 break;
645 deleted = 1;
646 } else if (ifp->flags & IFA_F_PERMANENT) {
647 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
648 ifp->prefix_len)) {
649 if (ifa->flags & IFA_F_PERMANENT) {
650 onlink = 1;
651 if (deleted)
652 break;
653 } else {
654 unsigned long lifetime;
655
656 if (!onlink)
657 onlink = -1;
658
659 spin_lock(&ifa->lock);
660 lifetime = min_t(unsigned long,
661 ifa->valid_lft, 0x7fffffffUL/HZ);
662 if (time_before(expires,
663 ifa->tstamp + lifetime * HZ))
664 expires = ifa->tstamp + lifetime * HZ;
665 spin_unlock(&ifa->lock);
666 }
667 }
668 }
669 }
670 write_unlock_bh(&idev->lock);
671
672 ipv6_ifa_notify(RTM_DELADDR, ifp);
673
674 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
675
676 addrconf_del_timer(ifp);
677
678 /*
679 * Purge or update corresponding prefix
680 *
681 * 1) we don't purge prefix here if address was not permanent.
682 * prefix is managed by its own lifetime.
683 * 2) if there're no addresses, delete prefix.
684 * 3) if there're still other permanent address(es),
685 * corresponding prefix is still permanent.
686 * 4) otherwise, update prefix lifetime to the
687 * longest valid lifetime among the corresponding
688 * addresses on the device.
689 * Note: subsequent RA will update lifetime.
690 *
691 * --yoshfuji
692 */
693 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
694 struct in6_addr prefix;
695 struct rt6_info *rt;
696
697 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
698 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
699
700 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
701 if (onlink == 0) {
0d51aa80 702 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 703 rt = NULL;
704 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
705 rt->rt6i_expires = expires;
706 rt->rt6i_flags |= RTF_EXPIRES;
707 }
708 }
709 dst_release(&rt->u.dst);
710 }
711
712 in6_ifa_put(ifp);
713}
714
715#ifdef CONFIG_IPV6_PRIVACY
716static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
717{
718 struct inet6_dev *idev = ifp->idev;
719 struct in6_addr addr, *tmpaddr;
720 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
721 int tmp_plen;
722 int ret = 0;
723 int max_addresses;
724
725 write_lock(&idev->lock);
726 if (ift) {
727 spin_lock_bh(&ift->lock);
728 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
729 spin_unlock_bh(&ift->lock);
730 tmpaddr = &addr;
731 } else {
732 tmpaddr = NULL;
733 }
734retry:
735 in6_dev_hold(idev);
736 if (idev->cnf.use_tempaddr <= 0) {
737 write_unlock(&idev->lock);
738 printk(KERN_INFO
739 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
740 in6_dev_put(idev);
741 ret = -1;
742 goto out;
743 }
744 spin_lock_bh(&ifp->lock);
745 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
746 idev->cnf.use_tempaddr = -1; /*XXX*/
747 spin_unlock_bh(&ifp->lock);
748 write_unlock(&idev->lock);
749 printk(KERN_WARNING
750 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
751 in6_dev_put(idev);
752 ret = -1;
753 goto out;
754 }
755 in6_ifa_hold(ifp);
756 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
757 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
758 spin_unlock_bh(&ifp->lock);
759 write_unlock(&idev->lock);
760 printk(KERN_WARNING
761 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
762 in6_ifa_put(ifp);
763 in6_dev_put(idev);
764 ret = -1;
765 goto out;
766 }
767 memcpy(&addr.s6_addr[8], idev->rndid, 8);
768 tmp_valid_lft = min_t(__u32,
769 ifp->valid_lft,
770 idev->cnf.temp_valid_lft);
771 tmp_prefered_lft = min_t(__u32,
772 ifp->prefered_lft,
773 idev->cnf.temp_prefered_lft - desync_factor / HZ);
774 tmp_plen = ifp->prefix_len;
775 max_addresses = idev->cnf.max_addresses;
776 tmp_cstamp = ifp->cstamp;
777 tmp_tstamp = ifp->tstamp;
778 spin_unlock_bh(&ifp->lock);
779
780 write_unlock(&idev->lock);
781 ift = !max_addresses ||
782 ipv6_count_addresses(idev) < max_addresses ?
783 ipv6_add_addr(idev, &addr, tmp_plen,
784 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
785 if (!ift || IS_ERR(ift)) {
786 in6_ifa_put(ifp);
787 in6_dev_put(idev);
788 printk(KERN_INFO
789 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
790 tmpaddr = &addr;
791 write_lock(&idev->lock);
792 goto retry;
793 }
794
795 spin_lock_bh(&ift->lock);
796 ift->ifpub = ifp;
797 ift->valid_lft = tmp_valid_lft;
798 ift->prefered_lft = tmp_prefered_lft;
799 ift->cstamp = tmp_cstamp;
800 ift->tstamp = tmp_tstamp;
801 spin_unlock_bh(&ift->lock);
802
803 addrconf_dad_start(ift, 0);
804 in6_ifa_put(ift);
805 in6_dev_put(idev);
806out:
807 return ret;
808}
809#endif
810
811/*
072047e4 812 * Choose an appropriate source address (RFC3484)
1da177e4 813 */
072047e4
YH		 814struct ipv6_saddr_score {
815 int addr_type;
816 unsigned int attrs;
817 int matchlen;
818 unsigned int scope;
819 unsigned int rule;
820};
821
822#define IPV6_SADDR_SCORE_LOCAL 0x0001
823#define IPV6_SADDR_SCORE_PREFERRED 0x0004
824#define IPV6_SADDR_SCORE_HOA 0x0008
825#define IPV6_SADDR_SCORE_OIF 0x0010
826#define IPV6_SADDR_SCORE_LABEL 0x0020
827#define IPV6_SADDR_SCORE_PRIVACY 0x0040
828
829static int inline ipv6_saddr_preferred(int type)
1da177e4 830{
072047e4
YH		 831 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
832 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
833 return 1;
834 return 0;
1da177e4
LT		 835}
836
072047e4
YH		 837/* static matching label */
838static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
839{
840 /*
841 * prefix (longest match) label
842 * -----------------------------
843 * ::1/128 0
844 * ::/0 1
845 * 2002::/16 2
846 * ::/96 3
847 * ::ffff:0:0/96 4
848 */
849 if (type & IPV6_ADDR_LOOPBACK)
850 return 0;
851 else if (type & IPV6_ADDR_COMPATv4)
852 return 3;
853 else if (type & IPV6_ADDR_MAPPED)
854 return 4;
855 else if (addr->s6_addr16[0] == htons(0x2002))
856 return 2;
857 return 1;
858}
1da177e4 859
072047e4 860int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 861 struct in6_addr *daddr, struct in6_addr *saddr)
862{
072047e4
YH		 863 struct ipv6_saddr_score hiscore;
864 struct inet6_ifaddr *ifa_result = NULL;
865 int daddr_type = __ipv6_addr_type(daddr);
866 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
867 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
868 struct net_device *dev;
1da177e4 869
072047e4 870 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 871
072047e4
YH		 872 read_lock(&dev_base_lock);
873 read_lock(&addrconf_lock);
1da177e4 874
072047e4
YH		 875 for (dev = dev_base; dev; dev=dev->next) {
876 struct inet6_dev *idev;
877 struct inet6_ifaddr *ifa;
878
879 /* Rule 0: Candidate Source Address (section 4)
880 * - multicast and link-local destination address,
881 * the set of candidate source address MUST only
882 * include addresses assigned to interfaces
883 * belonging to the same link as the outgoing
884 * interface.
885 * (- For site-local destination addresses, the
886 * set of candidate source addresses MUST only
887 * include addresses assigned to interfaces
888 * belonging to the same site as the outgoing
889 * interface.)
890 */
891 if ((daddr_type & IPV6_ADDR_MULTICAST ||
892 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
893 daddr_dev && dev != daddr_dev)
894 continue;
1da177e4 895
1da177e4 896 idev = __in6_dev_get(dev);
072047e4
YH		 897 if (!idev)
898 continue;
899
900 read_lock_bh(&idev->lock);
901 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
902 struct ipv6_saddr_score score;
903
904 score.addr_type = __ipv6_addr_type(&ifa->addr);
905
906 /* Rule 0: Candidate Source Address (section 4)
907 * - In any case, anycast addresses, multicast
908 * addresses, and the unspecified address MUST
909 * NOT be included in a candidate set.
910 */
911 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
912 score.addr_type & IPV6_ADDR_MULTICAST)) {
913 LIMIT_NETDEBUG(KERN_DEBUG
914 "ADDRCONF: unspecified / multicast address"
915 "assigned as unicast address on %s",
916 dev->name);
917 continue;
918 }
919
920 score.attrs = 0;
921 score.matchlen = 0;
922 score.scope = 0;
923 score.rule = 0;
924
925 if (ifa_result == NULL) {
926 /* record it if the first available entry */
927 goto record_it;
928 }
929
930 /* Rule 1: Prefer same address */
931 if (hiscore.rule < 1) {
932 if (ipv6_addr_equal(&ifa_result->addr, daddr))
933 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
934 hiscore.rule++;
935 }
936 if (ipv6_addr_equal(&ifa->addr, daddr)) {
937 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
938 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
939 score.rule = 1;
940 goto record_it;
1da177e4 941 }
072047e4
YH		 942 } else {
943 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
944 continue;
1da177e4 945 }
1da177e4 946
072047e4
YH		 947 /* Rule 2: Prefer appropriate scope */
948 if (hiscore.rule < 2) {
949 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
950 hiscore.rule++;
951 }
952 score.scope = __ipv6_addr_src_scope(score.addr_type);
953 if (hiscore.scope < score.scope) {
954 if (hiscore.scope < daddr_scope) {
955 score.rule = 2;
956 goto record_it;
957 } else
958 continue;
959 } else if (score.scope < hiscore.scope) {
960 if (score.scope < daddr_scope)
961 continue;
962 else {
963 score.rule = 2;
964 goto record_it;
965 }
966 }
1da177e4 967
072047e4
YH		 968 /* Rule 3: Avoid deprecated address */
969 if (hiscore.rule < 3) {
970 if (ipv6_saddr_preferred(hiscore.addr_type) ||
971 !(ifa_result->flags & IFA_F_DEPRECATED))
972 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
973 hiscore.rule++;
974 }
975 if (ipv6_saddr_preferred(score.addr_type) ||
976 !(ifa->flags & IFA_F_DEPRECATED)) {
977 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
978 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
979 score.rule = 3;
980 goto record_it;
981 }
982 } else {
983 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
984 continue;
985 }
1da177e4 986
072047e4 987 /* Rule 4: Prefer home address -- not implemented yet */
220bbd74
YH		 988 if (hiscore.rule < 4)
989 hiscore.rule++;
072047e4
YH		 990
991 /* Rule 5: Prefer outgoing interface */
992 if (hiscore.rule < 5) {
993 if (daddr_dev == NULL ||
994 daddr_dev == ifa_result->idev->dev)
995 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
996 hiscore.rule++;
997 }
998 if (daddr_dev == NULL ||
999 daddr_dev == ifa->idev->dev) {
1000 score.attrs |= IPV6_SADDR_SCORE_OIF;
1001 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1002 score.rule = 5;
1003 goto record_it;
1004 }
1005 } else {
1006 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1007 continue;
1008 }
1009
1010 /* Rule 6: Prefer matching label */
1011 if (hiscore.rule < 6) {
1012 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1013 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1014 hiscore.rule++;
1015 }
1016 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1017 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1018 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1019 score.rule = 6;
1020 goto record_it;
1da177e4 1021 }
072047e4
YH		 1022 } else {
1023 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1024 continue;
1025 }
1026
44fd0261 1027#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1028 /* Rule 7: Prefer public address
1029 * Note: prefer temprary address if use_tempaddr >= 2
1030 */
1031 if (hiscore.rule < 7) {
1032 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1033 (ifa_result->idev->cnf.use_tempaddr >= 2))
1034 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1035 hiscore.rule++;
1036 }
1037 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1038 (ifa->idev->cnf.use_tempaddr >= 2)) {
1039 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1040 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1041 score.rule = 7;
1042 goto record_it;
1043 }
1044 } else {
1045 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1046 continue;
1047 }
44fd0261 1048#endif
072047e4 1049 /* Rule 8: Use longest matching prefix */
12da2a43 1050 if (hiscore.rule < 8) {
072047e4 1051 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1052 hiscore.rule++;
1053 }
072047e4
YH		 1054 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1055 if (score.matchlen > hiscore.matchlen) {
1056 score.rule = 8;
1057 goto record_it;
1da177e4 1058 }
072047e4
YH		 1059#if 0
1060 else if (score.matchlen < hiscore.matchlen)
1061 continue;
1062#endif
1063
1064 /* Final Rule: choose first available one */
1065 continue;
1066record_it:
1067 if (ifa_result)
1068 in6_ifa_put(ifa_result);
1069 in6_ifa_hold(ifa);
1070 ifa_result = ifa;
1071 hiscore = score;
1da177e4 1072 }
072047e4 1073 read_unlock_bh(&idev->lock);
1da177e4 1074 }
1da177e4
LT		 1075 read_unlock(&addrconf_lock);
1076 read_unlock(&dev_base_lock);
1077
072047e4
YH		 1078 if (!ifa_result)
1079 return -EADDRNOTAVAIL;
1080
1081 ipv6_addr_copy(saddr, &ifa_result->addr);
1082 in6_ifa_put(ifa_result);
1083 return 0;
1da177e4
LT		 1084}
1085
1086
1087int ipv6_get_saddr(struct dst_entry *dst,
1088 struct in6_addr *daddr, struct in6_addr *saddr)
1089{
1090 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1091}
1092
1093
1094int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1095{
1096 struct inet6_dev *idev;
1097 int err = -EADDRNOTAVAIL;
1098
1099 read_lock(&addrconf_lock);
1100 if ((idev = __in6_dev_get(dev)) != NULL) {
1101 struct inet6_ifaddr *ifp;
1102
1103 read_lock_bh(&idev->lock);
1104 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1105 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1106 ipv6_addr_copy(addr, &ifp->addr);
1107 err = 0;
1108 break;
1109 }
1110 }
1111 read_unlock_bh(&idev->lock);
1112 }
1113 read_unlock(&addrconf_lock);
1114 return err;
1115}
1116
1117static int ipv6_count_addresses(struct inet6_dev *idev)
1118{
1119 int cnt = 0;
1120 struct inet6_ifaddr *ifp;
1121
1122 read_lock_bh(&idev->lock);
1123 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1124 cnt++;
1125 read_unlock_bh(&idev->lock);
1126 return cnt;
1127}
1128
1129int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1130{
1131 struct inet6_ifaddr * ifp;
1132 u8 hash = ipv6_addr_hash(addr);
1133
1134 read_lock_bh(&addrconf_hash_lock);
1135 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1136 if (ipv6_addr_equal(&ifp->addr, addr) &&
1137 !(ifp->flags&IFA_F_TENTATIVE)) {
1138 if (dev == NULL || ifp->idev->dev == dev ||
1139 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1140 break;
1141 }
1142 }
1143 read_unlock_bh(&addrconf_hash_lock);
1144 return ifp != NULL;
1145}
1146
1147static
1148int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1149{
1150 struct inet6_ifaddr * ifp;
1151 u8 hash = ipv6_addr_hash(addr);
1152
1153 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1154 if (ipv6_addr_equal(&ifp->addr, addr)) {
1155 if (dev == NULL || ifp->idev->dev == dev)
1156 break;
1157 }
1158 }
1159 return ifp != NULL;
1160}
1161
1162struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1163{
1164 struct inet6_ifaddr * ifp;
1165 u8 hash = ipv6_addr_hash(addr);
1166
1167 read_lock_bh(&addrconf_hash_lock);
1168 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1169 if (ipv6_addr_equal(&ifp->addr, addr)) {
1170 if (dev == NULL || ifp->idev->dev == dev ||
1171 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1172 in6_ifa_hold(ifp);
1173 break;
1174 }
1175 }
1176 }
1177 read_unlock_bh(&addrconf_hash_lock);
1178
1179 return ifp;
1180}
1181
1182int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1183{
1184 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1185 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1186 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
8feaf0c0 1187 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1188 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1189 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1190 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1191 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1192
1193 if (!sk2_rcv_saddr && !sk_ipv6only)
1194 return 1;
1195
1196 if (addr_type2 == IPV6_ADDR_ANY &&
1197 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1198 return 1;
1199
1200 if (addr_type == IPV6_ADDR_ANY &&
1201 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1202 return 1;
1203
1204 if (sk2_rcv_saddr6 &&
1205 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1206 return 1;
1207
1208 if (addr_type == IPV6_ADDR_MAPPED &&
1209 !sk2_ipv6only &&
1210 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1211 return 1;
1212
1213 return 0;
1214}
1215
1216/* Gets referenced address, destroys ifaddr */
1217
1218void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1219{
1220 if (net_ratelimit())
1221 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1222 if (ifp->flags&IFA_F_PERMANENT) {
1223 spin_lock_bh(&ifp->lock);
1224 addrconf_del_timer(ifp);
1225 ifp->flags |= IFA_F_TENTATIVE;
1226 spin_unlock_bh(&ifp->lock);
1227 in6_ifa_put(ifp);
1228#ifdef CONFIG_IPV6_PRIVACY
1229 } else if (ifp->flags&IFA_F_TEMPORARY) {
1230 struct inet6_ifaddr *ifpub;
1231 spin_lock_bh(&ifp->lock);
1232 ifpub = ifp->ifpub;
1233 if (ifpub) {
1234 in6_ifa_hold(ifpub);
1235 spin_unlock_bh(&ifp->lock);
1236 ipv6_create_tempaddr(ifpub, ifp);
1237 in6_ifa_put(ifpub);
1238 } else {
1239 spin_unlock_bh(&ifp->lock);
1240 }
1241 ipv6_del_addr(ifp);
1242#endif
1243 } else
1244 ipv6_del_addr(ifp);
1245}
1246
1247
1248/* Join to solicited addr multicast group. */
1249
1250void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1251{
1252 struct in6_addr maddr;
1253
1254 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1255 return;
1256
1257 addrconf_addr_solict_mult(addr, &maddr);
1258 ipv6_dev_mc_inc(dev, &maddr);
1259}
1260
1261void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1262{
1263 struct in6_addr maddr;
1264
1265 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1266 return;
1267
1268 addrconf_addr_solict_mult(addr, &maddr);
1269 __ipv6_dev_mc_dec(idev, &maddr);
1270}
1271
20380731 1272static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1273{
1274 struct in6_addr addr;
1275 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1276 if (ipv6_addr_any(&addr))
1277 return;
1278 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1279}
1280
20380731 1281static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1282{
1283 struct in6_addr addr;
1284 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1285 if (ipv6_addr_any(&addr))
1286 return;
1287 __ipv6_dev_ac_dec(ifp->idev, &addr);
1288}
1289
1290static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1291{
1292 switch (dev->type) {
1293 case ARPHRD_ETHER:
1294 case ARPHRD_FDDI:
1295 case ARPHRD_IEEE802_TR:
1296 if (dev->addr_len != ETH_ALEN)
1297 return -1;
1298 memcpy(eui, dev->dev_addr, 3);
1299 memcpy(eui + 5, dev->dev_addr + 3, 3);
1300
1301 /*
1302 * The zSeries OSA network cards can be shared among various
1303 * OS instances, but the OSA cards have only one MAC address.
1304 * This leads to duplicate address conflicts in conjunction
1305 * with IPv6 if more than one instance uses the same card.
1306 *
1307 * The driver for these cards can deliver a unique 16-bit
1308 * identifier for each instance sharing the same card. It is
1309 * placed instead of 0xFFFE in the interface identifier. The
1310 * "u" bit of the interface identifier is not inverted in this
1311 * case. Hence the resulting interface identifier has local
1312 * scope according to RFC2373.
1313 */
1314 if (dev->dev_id) {
1315 eui[3] = (dev->dev_id >> 8) & 0xFF;
1316 eui[4] = dev->dev_id & 0xFF;
1317 } else {
1318 eui[3] = 0xFF;
1319 eui[4] = 0xFE;
1320 eui[0] ^= 2;
1321 }
1322 return 0;
1323 case ARPHRD_ARCNET:
1324 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1325 if (dev->addr_len != ARCNET_ALEN)
1326 return -1;
1327 memset(eui, 0, 7);
1328 eui[7] = *(u8*)dev->dev_addr;
1329 return 0;
1330 case ARPHRD_INFINIBAND:
1331 if (dev->addr_len != INFINIBAND_ALEN)
1332 return -1;
1333 memcpy(eui, dev->dev_addr + 12, 8);
1334 eui[0] |= 2;
1335 return 0;
1336 }
1337 return -1;
1338}
1339
1340static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1341{
1342 int err = -1;
1343 struct inet6_ifaddr *ifp;
1344
1345 read_lock_bh(&idev->lock);
1346 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1347 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1348 memcpy(eui, ifp->addr.s6_addr+8, 8);
1349 err = 0;
1350 break;
1351 }
1352 }
1353 read_unlock_bh(&idev->lock);
1354 return err;
1355}
1356
1357#ifdef CONFIG_IPV6_PRIVACY
1358/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1359static int __ipv6_regen_rndid(struct inet6_dev *idev)
1360{
1361 struct net_device *dev;
1362 struct scatterlist sg[2];
1363
378f058c
DH		 1364 sg_set_buf(&sg[0], idev->entropy, 8);
1365 sg_set_buf(&sg[1], idev->work_eui64, 8);
1da177e4
LT		 1366
1367 dev = idev->dev;
1368
1369 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1370 printk(KERN_INFO
1371 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1372 idev);
1373 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1374 }
1375regen:
1376 spin_lock(&md5_tfm_lock);
1377 if (unlikely(md5_tfm == NULL)) {
1378 spin_unlock(&md5_tfm_lock);
1379 return -1;
1380 }
1381 crypto_digest_init(md5_tfm);
1382 crypto_digest_update(md5_tfm, sg, 2);
1383 crypto_digest_final(md5_tfm, idev->work_digest);
1384 spin_unlock(&md5_tfm_lock);
1385
1386 memcpy(idev->rndid, &idev->work_digest[0], 8);
1387 idev->rndid[0] &= ~0x02;
1388 memcpy(idev->entropy, &idev->work_digest[8], 8);
1389
1390 /*
1391 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1392 * check if generated address is not inappropriate
1393 *
1394 * - Reserved subnet anycast (RFC 2526)
1395 * 11111101 11....11 1xxxxxxx
1396 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1397 * 00-00-5E-FE-xx-xx-xx-xx
1398 * - value 0
1399 * - XXX: already assigned to an address on the device
1400 */
1401 if (idev->rndid[0] == 0xfd &&
1402 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1403 (idev->rndid[7]&0x80))
1404 goto regen;
1405 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1406 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1407 goto regen;
1408 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1409 goto regen;
1410 }
1411
1412 return 0;
1413}
1414
1415static void ipv6_regen_rndid(unsigned long data)
1416{
1417 struct inet6_dev *idev = (struct inet6_dev *) data;
1418 unsigned long expires;
1419
1420 read_lock_bh(&addrconf_lock);
1421 write_lock_bh(&idev->lock);
1422
1423 if (idev->dead)
1424 goto out;
1425
1426 if (__ipv6_regen_rndid(idev) < 0)
1427 goto out;
1428
1429 expires = jiffies +
1430 idev->cnf.temp_prefered_lft * HZ -
1431 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1432 if (time_before(expires, jiffies)) {
1433 printk(KERN_WARNING
1434 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1435 idev->dev->name);
1436 goto out;
1437 }
1438
1439 if (!mod_timer(&idev->regen_timer, expires))
1440 in6_dev_hold(idev);
1441
1442out:
1443 write_unlock_bh(&idev->lock);
1444 read_unlock_bh(&addrconf_lock);
1445 in6_dev_put(idev);
1446}
1447
1448static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1449 int ret = 0;
1450
1451 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1452 ret = __ipv6_regen_rndid(idev);
1453 return ret;
1454}
1455#endif
1456
1457/*
1458 * Add prefix route.
1459 */
1460
1461static void
1462addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1463 unsigned long expires, u32 flags)
1da177e4
LT		 1464{
1465 struct in6_rtmsg rtmsg;
1466
1467 memset(&rtmsg, 0, sizeof(rtmsg));
1468 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1469 rtmsg.rtmsg_dst_len = plen;
1470 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1471 rtmsg.rtmsg_ifindex = dev->ifindex;
1472 rtmsg.rtmsg_info = expires;
1473 rtmsg.rtmsg_flags = RTF_UP|flags;
1474 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1475
1476 /* Prevent useless cloning on PtP SIT.
1477 This thing is done here expecting that the whole
1478 class of non-broadcast devices need not cloning.
1479 */
1480 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1481 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1482
0d51aa80 1483 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1484}
1485
1486/* Create "default" multicast route to the interface */
1487
1488static void addrconf_add_mroute(struct net_device *dev)
1489{
1490 struct in6_rtmsg rtmsg;
1491
1492 memset(&rtmsg, 0, sizeof(rtmsg));
1493 ipv6_addr_set(&rtmsg.rtmsg_dst,
1494 htonl(0xFF000000), 0, 0, 0);
1495 rtmsg.rtmsg_dst_len = 8;
1496 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1497 rtmsg.rtmsg_ifindex = dev->ifindex;
1498 rtmsg.rtmsg_flags = RTF_UP;
1499 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
0d51aa80 1500 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1501}
1502
1503static void sit_route_add(struct net_device *dev)
1504{
1505 struct in6_rtmsg rtmsg;
1506
1507 memset(&rtmsg, 0, sizeof(rtmsg));
1508
1509 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1510 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1511
1512 /* prefix length - 96 bits "::d.d.d.d" */
1513 rtmsg.rtmsg_dst_len = 96;
1514 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1515 rtmsg.rtmsg_ifindex = dev->ifindex;
1516
0d51aa80 1517 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1518}
1519
1520static void addrconf_add_lroute(struct net_device *dev)
1521{
1522 struct in6_addr addr;
1523
1524 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1525 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1526}
1527
1528static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1529{
1530 struct inet6_dev *idev;
1531
1532 ASSERT_RTNL();
1533
1534 if ((idev = ipv6_find_idev(dev)) == NULL)
1535 return NULL;
1536
1537 /* Add default multicast route */
1538 addrconf_add_mroute(dev);
1539
1540 /* Add link local route */
1541 addrconf_add_lroute(dev);
1542 return idev;
1543}
1544
1545void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1546{
1547 struct prefix_info *pinfo;
1548 __u32 valid_lft;
1549 __u32 prefered_lft;
1550 int addr_type;
1551 unsigned long rt_expires;
1552 struct inet6_dev *in6_dev;
1553
1554 pinfo = (struct prefix_info *) opt;
1555
1556 if (len < sizeof(struct prefix_info)) {
1557 ADBG(("addrconf: prefix option too short\n"));
1558 return;
1559 }
1560
1561 /*
1562 * Validation checks ([ADDRCONF], page 19)
1563 */
1564
1565 addr_type = ipv6_addr_type(&pinfo->prefix);
1566
1567 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1568 return;
1569
1570 valid_lft = ntohl(pinfo->valid);
1571 prefered_lft = ntohl(pinfo->prefered);
1572
1573 if (prefered_lft > valid_lft) {
1574 if (net_ratelimit())
1575 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1576 return;
1577 }
1578
1579 in6_dev = in6_dev_get(dev);
1580
1581 if (in6_dev == NULL) {
1582 if (net_ratelimit())
1583 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1584 return;
1585 }
1586
1587 /*
1588 * Two things going on here:
1589 * 1) Add routes for on-link prefixes
1590 * 2) Configure prefixes with the auto flag set
1591 */
1592
1593 /* Avoid arithmetic overflow. Really, we could
1594 save rt_expires in seconds, likely valid_lft,
1595 but it would require division in fib gc, that it
1596 not good.
1597 */
1598 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1599 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1600 else
3dd4bc68
YH		 1601 rt_expires = valid_lft * HZ;
1602
1603 /*
1604 * We convert this (in jiffies) to clock_t later.
1605 * Avoid arithmetic overflow there as well.
1606 * Overflow can happen only if HZ < USER_HZ.
1607 */
1608 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1609 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1610
1611 if (pinfo->onlink) {
1612 struct rt6_info *rt;
1613 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1614
1615 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1616 if (rt->rt6i_flags&RTF_EXPIRES) {
1617 if (valid_lft == 0) {
0d51aa80 1618 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 1619 rt = NULL;
1620 } else {
3dd4bc68 1621 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1622 }
1623 }
1624 } else if (valid_lft) {
1625 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1626 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1627 }
1628 if (rt)
1629 dst_release(&rt->u.dst);
1630 }
1631
1632 /* Try to figure out our local address for this prefix */
1633
1634 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1635 struct inet6_ifaddr * ifp;
1636 struct in6_addr addr;
1637 int create = 0, update_lft = 0;
1638
1639 if (pinfo->prefix_len == 64) {
1640 memcpy(&addr, &pinfo->prefix, 8);
1641 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1642 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1643 in6_dev_put(in6_dev);
1644 return;
1645 }
1646 goto ok;
1647 }
1648 if (net_ratelimit())
1649 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1650 pinfo->prefix_len);
1651 in6_dev_put(in6_dev);
1652 return;
1653
1654ok:
1655
1656 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1657
1658 if (ifp == NULL && valid_lft) {
1659 int max_addresses = in6_dev->cnf.max_addresses;
1660
1661 /* Do not allow to create too much of autoconfigured
1662 * addresses; this would be too easy way to crash kernel.
1663 */
1664 if (!max_addresses ||
1665 ipv6_count_addresses(in6_dev) < max_addresses)
1666 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1667 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1668
1669 if (!ifp || IS_ERR(ifp)) {
1670 in6_dev_put(in6_dev);
1671 return;
1672 }
1673
1674 update_lft = create = 1;
1675 ifp->cstamp = jiffies;
1676 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1677 }
1678
1679 if (ifp) {
1680 int flags;
1681 unsigned long now;
1682#ifdef CONFIG_IPV6_PRIVACY
1683 struct inet6_ifaddr *ift;
1684#endif
1685 u32 stored_lft;
1686
1687 /* update lifetime (RFC2462 5.5.3 e) */
1688 spin_lock(&ifp->lock);
1689 now = jiffies;
1690 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1691 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1692 else
1693 stored_lft = 0;
1694 if (!update_lft && stored_lft) {
1695 if (valid_lft > MIN_VALID_LIFETIME ||
1696 valid_lft > stored_lft)
1697 update_lft = 1;
1698 else if (stored_lft <= MIN_VALID_LIFETIME) {
1699 /* valid_lft <= stored_lft is always true */
1700 /* XXX: IPsec */
1701 update_lft = 0;
1702 } else {
1703 valid_lft = MIN_VALID_LIFETIME;
1704 if (valid_lft < prefered_lft)
1705 prefered_lft = valid_lft;
1706 update_lft = 1;
1707 }
1708 }
1709
1710 if (update_lft) {
1711 ifp->valid_lft = valid_lft;
1712 ifp->prefered_lft = prefered_lft;
1713 ifp->tstamp = now;
1714 flags = ifp->flags;
1715 ifp->flags &= ~IFA_F_DEPRECATED;
1716 spin_unlock(&ifp->lock);
1717
1718 if (!(flags&IFA_F_TENTATIVE))
1719 ipv6_ifa_notify(0, ifp);
1720 } else
1721 spin_unlock(&ifp->lock);
1722
1723#ifdef CONFIG_IPV6_PRIVACY
1724 read_lock_bh(&in6_dev->lock);
1725 /* update all temporary addresses in the list */
1726 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1727 /*
1728 * When adjusting the lifetimes of an existing
1729 * temporary address, only lower the lifetimes.
1730 * Implementations must not increase the
1731 * lifetimes of an existing temporary address
1732 * when processing a Prefix Information Option.
1733 */
1734 spin_lock(&ift->lock);
1735 flags = ift->flags;
1736 if (ift->valid_lft > valid_lft &&
1737 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1738 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1739 if (ift->prefered_lft > prefered_lft &&
1740 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1741 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1742 spin_unlock(&ift->lock);
1743 if (!(flags&IFA_F_TENTATIVE))
1744 ipv6_ifa_notify(0, ift);
1745 }
1746
1747 if (create && in6_dev->cnf.use_tempaddr > 0) {
1748 /*
1749 * When a new public address is created as described in [ADDRCONF],
1750 * also create a new temporary address.
1751 */
1752 read_unlock_bh(&in6_dev->lock);
1753 ipv6_create_tempaddr(ifp, NULL);
1754 } else {
1755 read_unlock_bh(&in6_dev->lock);
1756 }
1757#endif
1758 in6_ifa_put(ifp);
1759 addrconf_verify(0);
1760 }
1761 }
1762 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1763 in6_dev_put(in6_dev);
1764}
1765
1766/*
1767 * Set destination address.
1768 * Special case for SIT interfaces where we create a new "virtual"
1769 * device.
1770 */
1771int addrconf_set_dstaddr(void __user *arg)
1772{
1773 struct in6_ifreq ireq;
1774 struct net_device *dev;
1775 int err = -EINVAL;
1776
1777 rtnl_lock();
1778
1779 err = -EFAULT;
1780 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1781 goto err_exit;
1782
1783 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1784
1785 err = -ENODEV;
1786 if (dev == NULL)
1787 goto err_exit;
1788
1789 if (dev->type == ARPHRD_SIT) {
1790 struct ifreq ifr;
1791 mm_segment_t oldfs;
1792 struct ip_tunnel_parm p;
1793
1794 err = -EADDRNOTAVAIL;
1795 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1796 goto err_exit;
1797
1798 memset(&p, 0, sizeof(p));
1799 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1800 p.iph.saddr = 0;
1801 p.iph.version = 4;
1802 p.iph.ihl = 5;
1803 p.iph.protocol = IPPROTO_IPV6;
1804 p.iph.ttl = 64;
1805 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1806
1807 oldfs = get_fs(); set_fs(KERNEL_DS);
1808 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1809 set_fs(oldfs);
1810
1811 if (err == 0) {
1812 err = -ENOBUFS;
1813 if ((dev = __dev_get_by_name(p.name)) == NULL)
1814 goto err_exit;
1815 err = dev_open(dev);
1816 }
1817 }
1818
1819err_exit:
1820 rtnl_unlock();
1821 return err;
1822}
1823
1824/*
1825 * Manual configuration of address on an interface
1826 */
1827static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1828{
1829 struct inet6_ifaddr *ifp;
1830 struct inet6_dev *idev;
1831 struct net_device *dev;
1832 int scope;
1833
1834 ASSERT_RTNL();
1835
1836 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1837 return -ENODEV;
1838
1839 if (!(dev->flags&IFF_UP))
1840 return -ENETDOWN;
1841
1842 if ((idev = addrconf_add_dev(dev)) == NULL)
1843 return -ENOBUFS;
1844
1845 scope = ipv6_addr_scope(pfx);
1846
1847 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1848 if (!IS_ERR(ifp)) {
1849 addrconf_dad_start(ifp, 0);
1850 in6_ifa_put(ifp);
1851 return 0;
1852 }
1853
1854 return PTR_ERR(ifp);
1855}
1856
1857static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1858{
1859 struct inet6_ifaddr *ifp;
1860 struct inet6_dev *idev;
1861 struct net_device *dev;
1862
1863 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1864 return -ENODEV;
1865
1866 if ((idev = __in6_dev_get(dev)) == NULL)
1867 return -ENXIO;
1868
1869 read_lock_bh(&idev->lock);
1870 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1871 if (ifp->prefix_len == plen &&
1872 ipv6_addr_equal(pfx, &ifp->addr)) {
1873 in6_ifa_hold(ifp);
1874 read_unlock_bh(&idev->lock);
1875
1876 ipv6_del_addr(ifp);
1877
1878 /* If the last address is deleted administratively,
1879 disable IPv6 on this interface.
1880 */
1881 if (idev->addr_list == NULL)
1882 addrconf_ifdown(idev->dev, 1);
1883 return 0;
1884 }
1885 }
1886 read_unlock_bh(&idev->lock);
1887 return -EADDRNOTAVAIL;
1888}
1889
1890
1891int addrconf_add_ifaddr(void __user *arg)
1892{
1893 struct in6_ifreq ireq;
1894 int err;
1895
1896 if (!capable(CAP_NET_ADMIN))
1897 return -EPERM;
1898
1899 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1900 return -EFAULT;
1901
1902 rtnl_lock();
1903 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1904 rtnl_unlock();
1905 return err;
1906}
1907
1908int addrconf_del_ifaddr(void __user *arg)
1909{
1910 struct in6_ifreq ireq;
1911 int err;
1912
1913 if (!capable(CAP_NET_ADMIN))
1914 return -EPERM;
1915
1916 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1917 return -EFAULT;
1918
1919 rtnl_lock();
1920 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1921 rtnl_unlock();
1922 return err;
1923}
1924
1925static void sit_add_v4_addrs(struct inet6_dev *idev)
1926{
1927 struct inet6_ifaddr * ifp;
1928 struct in6_addr addr;
1929 struct net_device *dev;
1930 int scope;
1931
1932 ASSERT_RTNL();
1933
1934 memset(&addr, 0, sizeof(struct in6_addr));
1935 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1936
1937 if (idev->dev->flags&IFF_POINTOPOINT) {
1938 addr.s6_addr32[0] = htonl(0xfe800000);
1939 scope = IFA_LINK;
1940 } else {
1941 scope = IPV6_ADDR_COMPATv4;
1942 }
1943
1944 if (addr.s6_addr32[3]) {
1945 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1946 if (!IS_ERR(ifp)) {
1947 spin_lock_bh(&ifp->lock);
1948 ifp->flags &= ~IFA_F_TENTATIVE;
1949 spin_unlock_bh(&ifp->lock);
1950 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1951 in6_ifa_put(ifp);
1952 }
1953 return;
1954 }
1955
1956 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 1957 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1958 if (in_dev && (dev->flags & IFF_UP)) {
1959 struct in_ifaddr * ifa;
1960
1961 int flag = scope;
1962
1963 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1964 int plen;
1965
1966 addr.s6_addr32[3] = ifa->ifa_local;
1967
1968 if (ifa->ifa_scope == RT_SCOPE_LINK)
1969 continue;
1970 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1971 if (idev->dev->flags&IFF_POINTOPOINT)
1972 continue;
1973 flag |= IFA_HOST;
1974 }
1975 if (idev->dev->flags&IFF_POINTOPOINT)
1976 plen = 64;
1977 else
1978 plen = 96;
1979
1980 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1981 IFA_F_PERMANENT);
1982 if (!IS_ERR(ifp)) {
1983 spin_lock_bh(&ifp->lock);
1984 ifp->flags &= ~IFA_F_TENTATIVE;
1985 spin_unlock_bh(&ifp->lock);
1986 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1987 in6_ifa_put(ifp);
1988 }
1989 }
1990 }
1991 }
1992}
1993
1994static void init_loopback(struct net_device *dev)
1995{
1996 struct inet6_dev *idev;
1997 struct inet6_ifaddr * ifp;
1998
1999 /* ::1 */
2000
2001 ASSERT_RTNL();
2002
2003 if ((idev = ipv6_find_idev(dev)) == NULL) {
2004 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2005 return;
2006 }
2007
2008 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2009 if (!IS_ERR(ifp)) {
2010 spin_lock_bh(&ifp->lock);
2011 ifp->flags &= ~IFA_F_TENTATIVE;
2012 spin_unlock_bh(&ifp->lock);
2013 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2014 in6_ifa_put(ifp);
2015 }
2016}
2017
2018static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2019{
2020 struct inet6_ifaddr * ifp;
2021
2022 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2023 if (!IS_ERR(ifp)) {
2024 addrconf_dad_start(ifp, 0);
2025 in6_ifa_put(ifp);
2026 }
2027}
2028
2029static void addrconf_dev_config(struct net_device *dev)
2030{
2031 struct in6_addr addr;
2032 struct inet6_dev * idev;
2033
2034 ASSERT_RTNL();
2035
2036 if ((dev->type != ARPHRD_ETHER) &&
2037 (dev->type != ARPHRD_FDDI) &&
2038 (dev->type != ARPHRD_IEEE802_TR) &&
2039 (dev->type != ARPHRD_ARCNET) &&
2040 (dev->type != ARPHRD_INFINIBAND)) {
2041 /* Alas, we support only Ethernet autoconfiguration. */
2042 return;
2043 }
2044
2045 idev = addrconf_add_dev(dev);
2046 if (idev == NULL)
2047 return;
2048
2049 memset(&addr, 0, sizeof(struct in6_addr));
2050 addr.s6_addr32[0] = htonl(0xFE800000);
2051
2052 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2053 addrconf_add_linklocal(idev, &addr);
2054}
2055
2056static void addrconf_sit_config(struct net_device *dev)
2057{
2058 struct inet6_dev *idev;
2059
2060 ASSERT_RTNL();
2061
2062 /*
2063 * Configure the tunnel with one of our IPv4
2064 * addresses... we should configure all of
2065 * our v4 addrs in the tunnel
2066 */
2067
2068 if ((idev = ipv6_find_idev(dev)) == NULL) {
2069 printk(KERN_DEBUG "init sit: add_dev failed\n");
2070 return;
2071 }
2072
2073 sit_add_v4_addrs(idev);
2074
2075 if (dev->flags&IFF_POINTOPOINT) {
2076 addrconf_add_mroute(dev);
2077 addrconf_add_lroute(dev);
2078 } else
2079 sit_route_add(dev);
2080}
2081
2082static inline int
2083ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2084{
2085 struct in6_addr lladdr;
2086
2087 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2088 addrconf_add_linklocal(idev, &lladdr);
2089 return 0;
2090 }
2091 return -1;
2092}
2093
2094static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2095{
2096 struct net_device *link_dev;
2097
2098 /* first try to inherit the link-local address from the link device */
2099 if (idev->dev->iflink &&
2100 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2101 if (!ipv6_inherit_linklocal(idev, link_dev))
2102 return;
2103 }
2104 /* then try to inherit it from any device */
2105 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2106 if (!ipv6_inherit_linklocal(idev, link_dev))
2107 return;
2108 }
2109 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2110}
2111
2112/*
2113 * Autoconfigure tunnel with a link-local address so routing protocols,
2114 * DHCPv6, MLD etc. can be run over the virtual link
2115 */
2116
2117static void addrconf_ip6_tnl_config(struct net_device *dev)
2118{
2119 struct inet6_dev *idev;
2120
2121 ASSERT_RTNL();
2122
2123 if ((idev = addrconf_add_dev(dev)) == NULL) {
2124 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2125 return;
2126 }
2127 ip6_tnl_add_linklocal(idev);
2128 addrconf_add_mroute(dev);
2129}
2130
2131static int addrconf_notify(struct notifier_block *this, unsigned long event,
2132 void * data)
2133{
2134 struct net_device *dev = (struct net_device *) data;
2135 struct inet6_dev *idev = __in6_dev_get(dev);
2136
2137 switch(event) {
2138 case NETDEV_UP:
2139 switch(dev->type) {
2140 case ARPHRD_SIT:
2141 addrconf_sit_config(dev);
2142 break;
2143 case ARPHRD_TUNNEL6:
2144 addrconf_ip6_tnl_config(dev);
2145 break;
2146 case ARPHRD_LOOPBACK:
2147 init_loopback(dev);
2148 break;
2149
2150 default:
2151 addrconf_dev_config(dev);
2152 break;
2153 };
2154 if (idev) {
2155 /* If the MTU changed during the interface down, when the
2156 interface up, the changed MTU must be reflected in the
2157 idev as well as routers.
2158 */
2159 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2160 rt6_mtu_change(dev, dev->mtu);
2161 idev->cnf.mtu6 = dev->mtu;
2162 }
2163 idev->tstamp = jiffies;
2164 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2165 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2166 stop IPv6 on this interface.
2167 */
2168 if (dev->mtu < IPV6_MIN_MTU)
2169 addrconf_ifdown(dev, event != NETDEV_DOWN);
2170 }
2171 break;
2172
2173 case NETDEV_CHANGEMTU:
2174 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2175 rt6_mtu_change(dev, dev->mtu);
2176 idev->cnf.mtu6 = dev->mtu;
2177 break;
2178 }
2179
2180 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2181
2182 case NETDEV_DOWN:
2183 case NETDEV_UNREGISTER:
2184 /*
2185 * Remove all addresses from this interface.
2186 */
2187 addrconf_ifdown(dev, event != NETDEV_DOWN);
2188 break;
2189 case NETDEV_CHANGE:
2190 break;
2191 case NETDEV_CHANGENAME:
2192#ifdef CONFIG_SYSCTL
2193 if (idev) {
2194 addrconf_sysctl_unregister(&idev->cnf);
2195 neigh_sysctl_unregister(idev->nd_parms);
2196 neigh_sysctl_register(dev, idev->nd_parms,
2197 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2198 &ndisc_ifinfo_sysctl_change,
2199 NULL);
2200 addrconf_sysctl_register(idev, &idev->cnf);
2201 }
2202#endif
2203 break;
2204 };
2205
2206 return NOTIFY_OK;
2207}
2208
2209/*
2210 * addrconf module should be notified of a device going up
2211 */
2212static struct notifier_block ipv6_dev_notf = {
2213 .notifier_call = addrconf_notify,
2214 .priority = 0
2215};
2216
2217static int addrconf_ifdown(struct net_device *dev, int how)
2218{
2219 struct inet6_dev *idev;
2220 struct inet6_ifaddr *ifa, **bifa;
2221 int i;
2222
2223 ASSERT_RTNL();
2224
2225 if (dev == &loopback_dev && how == 1)
2226 how = 0;
2227
2228 rt6_ifdown(dev);
2229 neigh_ifdown(&nd_tbl, dev);
2230
2231 idev = __in6_dev_get(dev);
2232 if (idev == NULL)
2233 return -ENODEV;
2234
2235 /* Step 1: remove reference to ipv6 device from parent device.
2236 Do not dev_put!
2237 */
2238 if (how == 1) {
2239 write_lock_bh(&addrconf_lock);
2240 dev->ip6_ptr = NULL;
2241 idev->dead = 1;
2242 write_unlock_bh(&addrconf_lock);
2243
2244 /* Step 1.5: remove snmp6 entry */
2245 snmp6_unregister_dev(idev);
2246
2247 }
2248
2249 /* Step 2: clear hash table */
2250 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2251 bifa = &inet6_addr_lst[i];
2252
2253 write_lock_bh(&addrconf_hash_lock);
2254 while ((ifa = *bifa) != NULL) {
2255 if (ifa->idev == idev) {
2256 *bifa = ifa->lst_next;
2257 ifa->lst_next = NULL;
2258 addrconf_del_timer(ifa);
2259 in6_ifa_put(ifa);
2260 continue;
2261 }
2262 bifa = &ifa->lst_next;
2263 }
2264 write_unlock_bh(&addrconf_hash_lock);
2265 }
2266
2267 write_lock_bh(&idev->lock);
2268
2269 /* Step 3: clear flags for stateless addrconf */
2270 if (how != 1)
2271 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2272
2273 /* Step 4: clear address list */
2274#ifdef CONFIG_IPV6_PRIVACY
2275 if (how == 1 && del_timer(&idev->regen_timer))
2276 in6_dev_put(idev);
2277
2278 /* clear tempaddr list */
2279 while ((ifa = idev->tempaddr_list) != NULL) {
2280 idev->tempaddr_list = ifa->tmp_next;
2281 ifa->tmp_next = NULL;
2282 ifa->dead = 1;
2283 write_unlock_bh(&idev->lock);
2284 spin_lock_bh(&ifa->lock);
2285
2286 if (ifa->ifpub) {
2287 in6_ifa_put(ifa->ifpub);
2288 ifa->ifpub = NULL;
2289 }
2290 spin_unlock_bh(&ifa->lock);
2291 in6_ifa_put(ifa);
2292 write_lock_bh(&idev->lock);
2293 }
2294#endif
2295 while ((ifa = idev->addr_list) != NULL) {
2296 idev->addr_list = ifa->if_next;
2297 ifa->if_next = NULL;
2298 ifa->dead = 1;
2299 addrconf_del_timer(ifa);
2300 write_unlock_bh(&idev->lock);
2301
2302 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2303 in6_ifa_put(ifa);
2304
2305 write_lock_bh(&idev->lock);
2306 }
2307 write_unlock_bh(&idev->lock);
2308
2309 /* Step 5: Discard multicast list */
2310
2311 if (how == 1)
2312 ipv6_mc_destroy_dev(idev);
2313 else
2314 ipv6_mc_down(idev);
2315
2316 /* Step 5: netlink notification of this interface */
2317 idev->tstamp = jiffies;
979ad663 2318 inet6_ifinfo_notify(RTM_DELLINK, idev);
1da177e4
LT		 2319
2320 /* Shot the device (if unregistered) */
2321
2322 if (how == 1) {
2323#ifdef CONFIG_SYSCTL
2324 addrconf_sysctl_unregister(&idev->cnf);
2325 neigh_sysctl_unregister(idev->nd_parms);
2326#endif
2327 neigh_parms_release(&nd_tbl, idev->nd_parms);
2328 neigh_ifdown(&nd_tbl, dev);
2329 in6_dev_put(idev);
2330 }
2331 return 0;
2332}
2333
2334static void addrconf_rs_timer(unsigned long data)
2335{
2336 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2337
2338 if (ifp->idev->cnf.forwarding)
2339 goto out;
2340
2341 if (ifp->idev->if_flags & IF_RA_RCVD) {
2342 /*
2343 * Announcement received after solicitation
2344 * was sent
2345 */
2346 goto out;
2347 }
2348
2349 spin_lock(&ifp->lock);
2350 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2351 struct in6_addr all_routers;
2352
2353 /* The wait after the last probe can be shorter */
2354 addrconf_mod_timer(ifp, AC_RS,
2355 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2356 ifp->idev->cnf.rtr_solicit_delay :
2357 ifp->idev->cnf.rtr_solicit_interval);
2358 spin_unlock(&ifp->lock);
2359
2360 ipv6_addr_all_routers(&all_routers);
2361
2362 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2363 } else {
2364 spin_unlock(&ifp->lock);
2365 /*
2366 * Note: we do not support deprecated "all on-link"
2367 * assumption any longer.
2368 */
2369 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2370 ifp->idev->dev->name);
2371 }
2372
2373out:
2374 in6_ifa_put(ifp);
2375}
2376
2377/*
2378 * Duplicate Address Detection
2379 */
e431b8c0 2380static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2381{
2382 struct inet6_dev *idev = ifp->idev;
2383 struct net_device *dev = idev->dev;
2384 unsigned long rand_num;
2385
2386 addrconf_join_solict(dev, &ifp->addr);
2387
2388 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2389 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2390 flags);
2391
2392 net_srandom(ifp->addr.s6_addr32[3]);
2393 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2394
2395 read_lock_bh(&idev->lock);
2396 if (ifp->dead)
2397 goto out;
2398 spin_lock_bh(&ifp->lock);
2399
2400 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2401 !(ifp->flags&IFA_F_TENTATIVE)) {
2402 ifp->flags &= ~IFA_F_TENTATIVE;
2403 spin_unlock_bh(&ifp->lock);
2404 read_unlock_bh(&idev->lock);
2405
2406 addrconf_dad_completed(ifp);
2407 return;
2408 }
2409
2410 ifp->probes = idev->cnf.dad_transmits;
2411 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2412
2413 spin_unlock_bh(&ifp->lock);
2414out:
2415 read_unlock_bh(&idev->lock);
2416}
2417
2418static void addrconf_dad_timer(unsigned long data)
2419{
2420 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2421 struct inet6_dev *idev = ifp->idev;
2422 struct in6_addr unspec;
2423 struct in6_addr mcaddr;
2424
2425 read_lock_bh(&idev->lock);
2426 if (idev->dead) {
2427 read_unlock_bh(&idev->lock);
2428 goto out;
2429 }
2430 spin_lock_bh(&ifp->lock);
2431 if (ifp->probes == 0) {
2432 /*
2433 * DAD was successful
2434 */
2435
2436 ifp->flags &= ~IFA_F_TENTATIVE;
2437 spin_unlock_bh(&ifp->lock);
2438 read_unlock_bh(&idev->lock);
2439
2440 addrconf_dad_completed(ifp);
2441
2442 goto out;
2443 }
2444
2445 ifp->probes--;
2446 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2447 spin_unlock_bh(&ifp->lock);
2448 read_unlock_bh(&idev->lock);
2449
2450 /* send a neighbour solicitation for our addr */
2451 memset(&unspec, 0, sizeof(unspec));
2452 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2453 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2454out:
2455 in6_ifa_put(ifp);
2456}
2457
2458static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2459{
2460 struct net_device * dev = ifp->idev->dev;
2461
2462 /*
2463 * Configure the address for reception. Now it is valid.
2464 */
2465
2466 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2467
2468 /* If added prefix is link local and forwarding is off,
2469 start sending router solicitations.
2470 */
2471
2472 if (ifp->idev->cnf.forwarding == 0 &&
2473 ifp->idev->cnf.rtr_solicits > 0 &&
2474 (dev->flags&IFF_LOOPBACK) == 0 &&
2475 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2476 struct in6_addr all_routers;
2477
2478 ipv6_addr_all_routers(&all_routers);
2479
2480 /*
2481 * If a host as already performed a random delay
2482 * [...] as part of DAD [...] there is no need
2483 * to delay again before sending the first RS
2484 */
2485 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2486
2487 spin_lock_bh(&ifp->lock);
2488 ifp->probes = 1;
2489 ifp->idev->if_flags |= IF_RS_SENT;
2490 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2491 spin_unlock_bh(&ifp->lock);
2492 }
2493}
2494
2495#ifdef CONFIG_PROC_FS
2496struct if6_iter_state {
2497 int bucket;
2498};
2499
2500static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2501{
2502 struct inet6_ifaddr *ifa = NULL;
2503 struct if6_iter_state *state = seq->private;
2504
2505 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2506 ifa = inet6_addr_lst[state->bucket];
2507 if (ifa)
2508 break;
2509 }
2510 return ifa;
2511}
2512
2513static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2514{
2515 struct if6_iter_state *state = seq->private;
2516
2517 ifa = ifa->lst_next;
2518try_again:
2519 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2520 ifa = inet6_addr_lst[state->bucket];
2521 goto try_again;
2522 }
2523 return ifa;
2524}
2525
2526static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2527{
2528 struct inet6_ifaddr *ifa = if6_get_first(seq);
2529
2530 if (ifa)
2531 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2532 --pos;
2533 return pos ? NULL : ifa;
2534}
2535
2536static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2537{
2538 read_lock_bh(&addrconf_hash_lock);
2539 return if6_get_idx(seq, *pos);
2540}
2541
2542static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2543{
2544 struct inet6_ifaddr *ifa;
2545
2546 ifa = if6_get_next(seq, v);
2547 ++*pos;
2548 return ifa;
2549}
2550
2551static void if6_seq_stop(struct seq_file *seq, void *v)
2552{
2553 read_unlock_bh(&addrconf_hash_lock);
2554}
2555
2556static int if6_seq_show(struct seq_file *seq, void *v)
2557{
2558 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2559 seq_printf(seq,
2560 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2561 NIP6(ifp->addr),
2562 ifp->idev->dev->ifindex,
2563 ifp->prefix_len,
2564 ifp->scope,
2565 ifp->flags,
2566 ifp->idev->dev->name);
2567 return 0;
2568}
2569
2570static struct seq_operations if6_seq_ops = {
2571 .start = if6_seq_start,
2572 .next = if6_seq_next,
2573 .show = if6_seq_show,
2574 .stop = if6_seq_stop,
2575};
2576
2577static int if6_seq_open(struct inode *inode, struct file *file)
2578{
2579 struct seq_file *seq;
2580 int rc = -ENOMEM;
2581 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2582
2583 if (!s)
2584 goto out;
2585 memset(s, 0, sizeof(*s));
2586
2587 rc = seq_open(file, &if6_seq_ops);
2588 if (rc)
2589 goto out_kfree;
2590
2591 seq = file->private_data;
2592 seq->private = s;
2593out:
2594 return rc;
2595out_kfree:
2596 kfree(s);
2597 goto out;
2598}
2599
2600static struct file_operations if6_fops = {
2601 .owner = THIS_MODULE,
2602 .open = if6_seq_open,
2603 .read = seq_read,
2604 .llseek = seq_lseek,
2605 .release = seq_release_private,
2606};
2607
2608int __init if6_proc_init(void)
2609{
2610 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2611 return -ENOMEM;
2612 return 0;
2613}
2614
2615void if6_proc_exit(void)
2616{
2617 proc_net_remove("if_inet6");
2618}
2619#endif /* CONFIG_PROC_FS */
2620
2621/*
2622 * Periodic address status verification
2623 */
2624
2625static void addrconf_verify(unsigned long foo)
2626{
2627 struct inet6_ifaddr *ifp;
2628 unsigned long now, next;
2629 int i;
2630
2631 spin_lock_bh(&addrconf_verify_lock);
2632 now = jiffies;
2633 next = now + ADDR_CHECK_FREQUENCY;
2634
2635 del_timer(&addr_chk_timer);
2636
2637 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2638
2639restart:
5d5780df 2640 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2641 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2642 unsigned long age;
2643#ifdef CONFIG_IPV6_PRIVACY
2644 unsigned long regen_advance;
2645#endif
2646
2647 if (ifp->flags & IFA_F_PERMANENT)
2648 continue;
2649
2650 spin_lock(&ifp->lock);
2651 age = (now - ifp->tstamp) / HZ;
2652
2653#ifdef CONFIG_IPV6_PRIVACY
2654 regen_advance = ifp->idev->cnf.regen_max_retry *
2655 ifp->idev->cnf.dad_transmits *
2656 ifp->idev->nd_parms->retrans_time / HZ;
2657#endif
2658
2659 if (age >= ifp->valid_lft) {
2660 spin_unlock(&ifp->lock);
2661 in6_ifa_hold(ifp);
5d5780df 2662 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2663 ipv6_del_addr(ifp);
2664 goto restart;
2665 } else if (age >= ifp->prefered_lft) {
2666 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2667 int deprecate = 0;
2668
2669 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2670 deprecate = 1;
2671 ifp->flags |= IFA_F_DEPRECATED;
2672 }
2673
2674 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2675 next = ifp->tstamp + ifp->valid_lft * HZ;
2676
2677 spin_unlock(&ifp->lock);
2678
2679 if (deprecate) {
2680 in6_ifa_hold(ifp);
5d5780df 2681 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2682
2683 ipv6_ifa_notify(0, ifp);
2684 in6_ifa_put(ifp);
2685 goto restart;
2686 }
2687#ifdef CONFIG_IPV6_PRIVACY
2688 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2689 !(ifp->flags&IFA_F_TENTATIVE)) {
2690 if (age >= ifp->prefered_lft - regen_advance) {
2691 struct inet6_ifaddr *ifpub = ifp->ifpub;
2692 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2693 next = ifp->tstamp + ifp->prefered_lft * HZ;
2694 if (!ifp->regen_count && ifpub) {
2695 ifp->regen_count++;
2696 in6_ifa_hold(ifp);
2697 in6_ifa_hold(ifpub);
2698 spin_unlock(&ifp->lock);
5d5780df 2699 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2700 ipv6_create_tempaddr(ifpub, ifp);
2701 in6_ifa_put(ifpub);
2702 in6_ifa_put(ifp);
2703 goto restart;
2704 }
2705 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2706 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2707 spin_unlock(&ifp->lock);
2708#endif
2709 } else {
2710 /* ifp->prefered_lft <= ifp->valid_lft */
2711 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2712 next = ifp->tstamp + ifp->prefered_lft * HZ;
2713 spin_unlock(&ifp->lock);
2714 }
2715 }
5d5780df 2716 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2717 }
2718
2719 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2720 add_timer(&addr_chk_timer);
2721 spin_unlock_bh(&addrconf_verify_lock);
2722}
2723
2724static int
2725inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2726{
2727 struct rtattr **rta = arg;
2728 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2729 struct in6_addr *pfx;
2730
2731 pfx = NULL;
2732 if (rta[IFA_ADDRESS-1]) {
2733 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2734 return -EINVAL;
2735 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2736 }
2737 if (rta[IFA_LOCAL-1]) {
2738 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2739 return -EINVAL;
2740 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2741 }
2742 if (pfx == NULL)
2743 return -EINVAL;
2744
2745 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2746}
2747
2748static int
2749inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2750{
2751 struct rtattr **rta = arg;
2752 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2753 struct in6_addr *pfx;
2754
2755 pfx = NULL;
2756 if (rta[IFA_ADDRESS-1]) {
2757 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2758 return -EINVAL;
2759 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2760 }
2761 if (rta[IFA_LOCAL-1]) {
2762 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2763 return -EINVAL;
2764 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2765 }
2766 if (pfx == NULL)
2767 return -EINVAL;
2768
2769 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2770}
2771
2772static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 2773 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 2774{
2775 struct ifaddrmsg *ifm;
2776 struct nlmsghdr *nlh;
2777 struct ifa_cacheinfo ci;
2778 unsigned char *b = skb->tail;
2779
b6544c0b 2780 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2781 ifm = NLMSG_DATA(nlh);
2782 ifm->ifa_family = AF_INET6;
2783 ifm->ifa_prefixlen = ifa->prefix_len;
2784 ifm->ifa_flags = ifa->flags;
2785 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2786 if (ifa->scope&IFA_HOST)
2787 ifm->ifa_scope = RT_SCOPE_HOST;
2788 else if (ifa->scope&IFA_LINK)
2789 ifm->ifa_scope = RT_SCOPE_LINK;
2790 else if (ifa->scope&IFA_SITE)
2791 ifm->ifa_scope = RT_SCOPE_SITE;
2792 ifm->ifa_index = ifa->idev->dev->ifindex;
2793 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2794 if (!(ifa->flags&IFA_F_PERMANENT)) {
2795 ci.ifa_prefered = ifa->prefered_lft;
2796 ci.ifa_valid = ifa->valid_lft;
2797 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2798 long tval = (jiffies - ifa->tstamp)/HZ;
2799 ci.ifa_prefered -= tval;
2800 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2801 ci.ifa_valid -= tval;
2802 }
2803 } else {
2804 ci.ifa_prefered = INFINITY_LIFE_TIME;
2805 ci.ifa_valid = INFINITY_LIFE_TIME;
2806 }
2807 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2808 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2809 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2810 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2811 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2812 nlh->nlmsg_len = skb->tail - b;
2813 return skb->len;
2814
2815nlmsg_failure:
2816rtattr_failure:
2817 skb_trim(skb, b - skb->data);
2818 return -1;
2819}
2820
2821static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 2822 u32 pid, u32 seq, int event, u16 flags)
1da177e4
LT		 2823{
2824 struct ifaddrmsg *ifm;
2825 struct nlmsghdr *nlh;
2826 struct ifa_cacheinfo ci;
2827 unsigned char *b = skb->tail;
2828
b6544c0b 2829 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2830 ifm = NLMSG_DATA(nlh);
2831 ifm->ifa_family = AF_INET6;
2832 ifm->ifa_prefixlen = 128;
2833 ifm->ifa_flags = IFA_F_PERMANENT;
2834 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2835 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2836 ifm->ifa_scope = RT_SCOPE_SITE;
2837 ifm->ifa_index = ifmca->idev->dev->ifindex;
2838 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2839 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2840 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2841 * 100 / HZ);
2842 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2843 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2844 * 100 / HZ);
2845 ci.ifa_prefered = INFINITY_LIFE_TIME;
2846 ci.ifa_valid = INFINITY_LIFE_TIME;
2847 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2848 nlh->nlmsg_len = skb->tail - b;
2849 return skb->len;
2850
2851nlmsg_failure:
2852rtattr_failure:
2853 skb_trim(skb, b - skb->data);
2854 return -1;
2855}
2856
2857static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 2858 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 2859{
2860 struct ifaddrmsg *ifm;
2861 struct nlmsghdr *nlh;
2862 struct ifa_cacheinfo ci;
2863 unsigned char *b = skb->tail;
2864
b6544c0b 2865 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2866 ifm = NLMSG_DATA(nlh);
2867 ifm->ifa_family = AF_INET6;
2868 ifm->ifa_prefixlen = 128;
2869 ifm->ifa_flags = IFA_F_PERMANENT;
2870 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2871 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2872 ifm->ifa_scope = RT_SCOPE_SITE;
2873 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2874 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2875 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2876 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2877 * 100 / HZ);
2878 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2879 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2880 * 100 / HZ);
2881 ci.ifa_prefered = INFINITY_LIFE_TIME;
2882 ci.ifa_valid = INFINITY_LIFE_TIME;
2883 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2884 nlh->nlmsg_len = skb->tail - b;
2885 return skb->len;
2886
2887nlmsg_failure:
2888rtattr_failure:
2889 skb_trim(skb, b - skb->data);
2890 return -1;
2891}
2892
2893enum addr_type_t
2894{
2895 UNICAST_ADDR,
2896 MULTICAST_ADDR,
2897 ANYCAST_ADDR,
2898};
2899
2900static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2901 enum addr_type_t type)
2902{
2903 int idx, ip_idx;
2904 int s_idx, s_ip_idx;
2905 int err = 1;
2906 struct net_device *dev;
2907 struct inet6_dev *idev = NULL;
2908 struct inet6_ifaddr *ifa;
2909 struct ifmcaddr6 *ifmca;
2910 struct ifacaddr6 *ifaca;
2911
2912 s_idx = cb->args[0];
2913 s_ip_idx = ip_idx = cb->args[1];
2914 read_lock(&dev_base_lock);
2915
2916 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2917 if (idx < s_idx)
2918 continue;
2919 if (idx > s_idx)
2920 s_ip_idx = 0;
2921 ip_idx = 0;
2922 if ((idev = in6_dev_get(dev)) == NULL)
2923 continue;
2924 read_lock_bh(&idev->lock);
2925 switch (type) {
2926 case UNICAST_ADDR:
ae9cda5d 2927 /* unicast address incl. temp addr */
1da177e4
LT		 2928 for (ifa = idev->addr_list; ifa;
2929 ifa = ifa->if_next, ip_idx++) {
2930 if (ip_idx < s_ip_idx)
2931 continue;
2932 if ((err = inet6_fill_ifaddr(skb, ifa,
2933 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 2934 cb->nlh->nlmsg_seq, RTM_NEWADDR,
2935 NLM_F_MULTI)) <= 0)
1da177e4
LT		 2936 goto done;
2937 }
1da177e4
LT		 2938 break;
2939 case MULTICAST_ADDR:
2940 /* multicast address */
2941 for (ifmca = idev->mc_list; ifmca;
2942 ifmca = ifmca->next, ip_idx++) {
2943 if (ip_idx < s_ip_idx)
2944 continue;
2945 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2946 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 2947 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2948 NLM_F_MULTI)) <= 0)
1da177e4
LT		 2949 goto done;
2950 }
2951 break;
2952 case ANYCAST_ADDR:
2953 /* anycast address */
2954 for (ifaca = idev->ac_list; ifaca;
2955 ifaca = ifaca->aca_next, ip_idx++) {
2956 if (ip_idx < s_ip_idx)
2957 continue;
2958 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2959 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 2960 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2961 NLM_F_MULTI)) <= 0)
1da177e4
LT		 2962 goto done;
2963 }
2964 break;
2965 default:
2966 break;
2967 }
2968 read_unlock_bh(&idev->lock);
2969 in6_dev_put(idev);
2970 }
2971done:
2972 if (err <= 0) {
2973 read_unlock_bh(&idev->lock);
2974 in6_dev_put(idev);
2975 }
2976 read_unlock(&dev_base_lock);
2977 cb->args[0] = idx;
2978 cb->args[1] = ip_idx;
2979 return skb->len;
2980}
2981
2982static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2983{
2984 enum addr_type_t type = UNICAST_ADDR;
2985 return inet6_dump_addr(skb, cb, type);
2986}
2987
2988static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2989{
2990 enum addr_type_t type = MULTICAST_ADDR;
2991 return inet6_dump_addr(skb, cb, type);
2992}
2993
2994
2995static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2996{
2997 enum addr_type_t type = ANYCAST_ADDR;
2998 return inet6_dump_addr(skb, cb, type);
2999}
3000
3001static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3002{
3003 struct sk_buff *skb;
3004 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3005
3006 skb = alloc_skb(size, GFP_ATOMIC);
3007 if (!skb) {
ac6d439d 3008 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
1da177e4
LT		 3009 return;
3010 }
9ed19f33 3011 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
1da177e4 3012 kfree_skb(skb);
ac6d439d 3013 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
1da177e4
LT		 3014 return;
3015 }
ac6d439d
PM		 3016 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3017 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
1da177e4
LT		 3018}
3019
3020static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3021 __s32 *array, int bytes)
3022{
3023 memset(array, 0, bytes);
3024 array[DEVCONF_FORWARDING] = cnf->forwarding;
3025 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3026 array[DEVCONF_MTU6] = cnf->mtu6;
3027 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3028 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3029 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3030 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3031 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3032 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3033 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3034 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3035#ifdef CONFIG_IPV6_PRIVACY
3036 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3037 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3038 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3039 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3040 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3041#endif
3042 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3043}
3044
3045static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3046 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 3047{
3048 struct net_device *dev = idev->dev;
3049 __s32 *array = NULL;
3050 struct ifinfomsg *r;
3051 struct nlmsghdr *nlh;
3052 unsigned char *b = skb->tail;
3053 struct rtattr *subattr;
3054 __u32 mtu = dev->mtu;
3055 struct ifla_cacheinfo ci;
3056
b6544c0b 3057 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
1da177e4
LT		 3058 r = NLMSG_DATA(nlh);
3059 r->ifi_family = AF_INET6;
9ef1d4c7 3060 r->__ifi_pad = 0;
1da177e4
LT		 3061 r->ifi_type = dev->type;
3062 r->ifi_index = dev->ifindex;
3063 r->ifi_flags = dev_get_flags(dev);
3064 r->ifi_change = 0;
3065
3066 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3067
3068 if (dev->addr_len)
3069 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3070
3071 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3072 if (dev->ifindex != dev->iflink)
3073 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3074
3075 subattr = (struct rtattr*)skb->tail;
3076
3077 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3078
3079 /* return the device flags */
3080 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3081
3082 /* return interface cacheinfo */
3083 ci.max_reasm_len = IPV6_MAXPLEN;
3084 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3085 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3086 ci.reachable_time = idev->nd_parms->reachable_time;
3087 ci.retrans_time = idev->nd_parms->retrans_time;
3088 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3089
3090 /* return the device sysctl params */
3091 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3092 goto rtattr_failure;
3093 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3094 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3095
3096 /* XXX - Statistics/MC not implemented */
3097 subattr->rta_len = skb->tail - (u8*)subattr;
3098
3099 nlh->nlmsg_len = skb->tail - b;
3100 kfree(array);
3101 return skb->len;
3102
3103nlmsg_failure:
3104rtattr_failure:
a51482bd 3105 kfree(array);
1da177e4
LT		 3106 skb_trim(skb, b - skb->data);
3107 return -1;
3108}
3109
3110static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3111{
3112 int idx, err;
3113 int s_idx = cb->args[0];
3114 struct net_device *dev;
3115 struct inet6_dev *idev;
3116
3117 read_lock(&dev_base_lock);
3118 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3119 if (idx < s_idx)
3120 continue;
3121 if ((idev = in6_dev_get(dev)) == NULL)
3122 continue;
3123 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3124 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3125 in6_dev_put(idev);
3126 if (err <= 0)
3127 break;
3128 }
3129 read_unlock(&dev_base_lock);
3130 cb->args[0] = idx;
3131
3132 return skb->len;
3133}
3134
3135void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3136{
3137 struct sk_buff *skb;
3138 /* 128 bytes ?? */
3139 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3140
3141 skb = alloc_skb(size, GFP_ATOMIC);
3142 if (!skb) {
ac6d439d 3143 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
1da177e4
LT		 3144 return;
3145 }
9ed19f33 3146 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
1da177e4 3147 kfree_skb(skb);
ac6d439d 3148 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
1da177e4
LT		 3149 return;
3150 }
ac6d439d
PM		 3151 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3152 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
1da177e4
LT		 3153}
3154
3155static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b
JHS		 3156 struct prefix_info *pinfo, u32 pid, u32 seq,
3157 int event, unsigned int flags)
1da177e4
LT		 3158{
3159 struct prefixmsg *pmsg;
3160 struct nlmsghdr *nlh;
3161 unsigned char *b = skb->tail;
3162 struct prefix_cacheinfo ci;
3163
b6544c0b 3164 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
1da177e4
LT		 3165 pmsg = NLMSG_DATA(nlh);
3166 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3167 pmsg->prefix_pad1 = 0;
3168 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3169 pmsg->prefix_ifindex = idev->dev->ifindex;
3170 pmsg->prefix_len = pinfo->prefix_len;
3171 pmsg->prefix_type = pinfo->type;
8a47077a 3172 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3173
3174 pmsg->prefix_flags = 0;
3175 if (pinfo->onlink)
3176 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3177 if (pinfo->autoconf)
3178 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3179
3180 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3181
3182 ci.preferred_time = ntohl(pinfo->prefered);
3183 ci.valid_time = ntohl(pinfo->valid);
3184 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3185
3186 nlh->nlmsg_len = skb->tail - b;
3187 return skb->len;
3188
3189nlmsg_failure:
3190rtattr_failure:
3191 skb_trim(skb, b - skb->data);
3192 return -1;
3193}
3194
3195static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3196 struct prefix_info *pinfo)
3197{
3198 struct sk_buff *skb;
3199 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3200
3201 skb = alloc_skb(size, GFP_ATOMIC);
3202 if (!skb) {
ac6d439d 3203 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
1da177e4
LT		 3204 return;
3205 }
9ed19f33 3206 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
1da177e4 3207 kfree_skb(skb);
ac6d439d 3208 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
1da177e4
LT		 3209 return;
3210 }
ac6d439d
PM		 3211 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3212 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
1da177e4
LT		 3213}
3214
db46edc6 3215static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
1da177e4
LT		 3216 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3217 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3218 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3219 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3220 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3221 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3222 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3223 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3224 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3225 .dumpit = inet6_dump_fib, },
3226};
3227
3228static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3229{
3230 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3231
3232 switch (event) {
3233 case RTM_NEWADDR:
3234 dst_hold(&ifp->rt->u.dst);
0d51aa80 3235 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
1da177e4
LT		 3236 dst_release(&ifp->rt->u.dst);
3237 if (ifp->idev->cnf.forwarding)
3238 addrconf_join_anycast(ifp);
3239 break;
3240 case RTM_DELADDR:
3241 if (ifp->idev->cnf.forwarding)
3242 addrconf_leave_anycast(ifp);
3243 addrconf_leave_solict(ifp->idev, &ifp->addr);
3244 dst_hold(&ifp->rt->u.dst);
0d51aa80 3245 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
1da177e4
LT		 3246 dst_free(&ifp->rt->u.dst);
3247 else
3248 dst_release(&ifp->rt->u.dst);
3249 break;
3250 }
3251}
3252
3253static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3254{
3255 read_lock_bh(&addrconf_lock);
3256 if (likely(ifp->idev->dead == 0))
3257 __ipv6_ifa_notify(event, ifp);
3258 read_unlock_bh(&addrconf_lock);
3259}
3260
3261#ifdef CONFIG_SYSCTL
3262
3263static
3264int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3265 void __user *buffer, size_t *lenp, loff_t *ppos)
3266{
3267 int *valp = ctl->data;
3268 int val = *valp;
3269 int ret;
3270
3271 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3272
3273 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3274 if (valp != &ipv6_devconf.forwarding) {
3275 if ((!*valp) ^ (!val)) {
3276 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3277 if (idev == NULL)
3278 return ret;
3279 dev_forward_change(idev);
3280 }
3281 } else {
3282 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3283 addrconf_forward_change();
3284 }
3285 if (*valp)
3286 rt6_purge_dflt_routers();
3287 }
3288
3289 return ret;
3290}
3291
3292static int addrconf_sysctl_forward_strategy(ctl_table *table,
3293 int __user *name, int nlen,
3294 void __user *oldval,
3295 size_t __user *oldlenp,
3296 void __user *newval, size_t newlen,
3297 void **context)
3298{
3299 int *valp = table->data;
3300 int new;
3301
3302 if (!newval || !newlen)
3303 return 0;
3304 if (newlen != sizeof(int))
3305 return -EINVAL;
3306 if (get_user(new, (int __user *)newval))
3307 return -EFAULT;
3308 if (new == *valp)
3309 return 0;
3310 if (oldval && oldlenp) {
3311 size_t len;
3312 if (get_user(len, oldlenp))
3313 return -EFAULT;
3314 if (len) {
3315 if (len > table->maxlen)
3316 len = table->maxlen;
3317 if (copy_to_user(oldval, valp, len))
3318 return -EFAULT;
3319 if (put_user(len, oldlenp))
3320 return -EFAULT;
3321 }
3322 }
3323
3324 if (valp != &ipv6_devconf_dflt.forwarding) {
3325 if (valp != &ipv6_devconf.forwarding) {
3326 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3327 int changed;
3328 if (unlikely(idev == NULL))
3329 return -ENODEV;
3330 changed = (!*valp) ^ (!new);
3331 *valp = new;
3332 if (changed)
3333 dev_forward_change(idev);
3334 } else {
3335 *valp = new;
3336 addrconf_forward_change();
3337 }
3338
3339 if (*valp)
3340 rt6_purge_dflt_routers();
3341 } else
3342 *valp = new;
3343
3344 return 1;
3345}
3346
3347static struct addrconf_sysctl_table
3348{
3349 struct ctl_table_header *sysctl_header;
3350 ctl_table addrconf_vars[__NET_IPV6_MAX];
3351 ctl_table addrconf_dev[2];
3352 ctl_table addrconf_conf_dir[2];
3353 ctl_table addrconf_proto_dir[2];
3354 ctl_table addrconf_root_dir[2];
3355} addrconf_sysctl = {
3356 .sysctl_header = NULL,
3357 .addrconf_vars = {
3358 {
3359 .ctl_name = NET_IPV6_FORWARDING,
3360 .procname = "forwarding",
3361 .data = &ipv6_devconf.forwarding,
3362 .maxlen = sizeof(int),
3363 .mode = 0644,
3364 .proc_handler = &addrconf_sysctl_forward,
3365 .strategy = &addrconf_sysctl_forward_strategy,
3366 },
3367 {
3368 .ctl_name = NET_IPV6_HOP_LIMIT,
3369 .procname = "hop_limit",
3370 .data = &ipv6_devconf.hop_limit,
3371 .maxlen = sizeof(int),
3372 .mode = 0644,
3373 .proc_handler = proc_dointvec,
3374 },
3375 {
3376 .ctl_name = NET_IPV6_MTU,
3377 .procname = "mtu",
3378 .data = &ipv6_devconf.mtu6,
3379 .maxlen = sizeof(int),
3380 .mode = 0644,
3381 .proc_handler = &proc_dointvec,
3382 },
3383 {
3384 .ctl_name = NET_IPV6_ACCEPT_RA,
3385 .procname = "accept_ra",
3386 .data = &ipv6_devconf.accept_ra,
3387 .maxlen = sizeof(int),
3388 .mode = 0644,
3389 .proc_handler = &proc_dointvec,
3390 },
3391 {
3392 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3393 .procname = "accept_redirects",
3394 .data = &ipv6_devconf.accept_redirects,
3395 .maxlen = sizeof(int),
3396 .mode = 0644,
3397 .proc_handler = &proc_dointvec,
3398 },
3399 {
3400 .ctl_name = NET_IPV6_AUTOCONF,
3401 .procname = "autoconf",
3402 .data = &ipv6_devconf.autoconf,
3403 .maxlen = sizeof(int),
3404 .mode = 0644,
3405 .proc_handler = &proc_dointvec,
3406 },
3407 {
3408 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3409 .procname = "dad_transmits",
3410 .data = &ipv6_devconf.dad_transmits,
3411 .maxlen = sizeof(int),
3412 .mode = 0644,
3413 .proc_handler = &proc_dointvec,
3414 },
3415 {
3416 .ctl_name = NET_IPV6_RTR_SOLICITS,
3417 .procname = "router_solicitations",
3418 .data = &ipv6_devconf.rtr_solicits,
3419 .maxlen = sizeof(int),
3420 .mode = 0644,
3421 .proc_handler = &proc_dointvec,
3422 },
3423 {
3424 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3425 .procname = "router_solicitation_interval",
3426 .data = &ipv6_devconf.rtr_solicit_interval,
3427 .maxlen = sizeof(int),
3428 .mode = 0644,
3429 .proc_handler = &proc_dointvec_jiffies,
3430 .strategy = &sysctl_jiffies,
3431 },
3432 {
3433 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3434 .procname = "router_solicitation_delay",
3435 .data = &ipv6_devconf.rtr_solicit_delay,
3436 .maxlen = sizeof(int),
3437 .mode = 0644,
3438 .proc_handler = &proc_dointvec_jiffies,
3439 .strategy = &sysctl_jiffies,
3440 },
3441 {
3442 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3443 .procname = "force_mld_version",
3444 .data = &ipv6_devconf.force_mld_version,
3445 .maxlen = sizeof(int),
3446 .mode = 0644,
3447 .proc_handler = &proc_dointvec,
3448 },
3449#ifdef CONFIG_IPV6_PRIVACY
3450 {
3451 .ctl_name = NET_IPV6_USE_TEMPADDR,
3452 .procname = "use_tempaddr",
3453 .data = &ipv6_devconf.use_tempaddr,
3454 .maxlen = sizeof(int),
3455 .mode = 0644,
3456 .proc_handler = &proc_dointvec,
3457 },
3458 {
3459 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3460 .procname = "temp_valid_lft",
3461 .data = &ipv6_devconf.temp_valid_lft,
3462 .maxlen = sizeof(int),
3463 .mode = 0644,
3464 .proc_handler = &proc_dointvec,
3465 },
3466 {
3467 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3468 .procname = "temp_prefered_lft",
3469 .data = &ipv6_devconf.temp_prefered_lft,
3470 .maxlen = sizeof(int),
3471 .mode = 0644,
3472 .proc_handler = &proc_dointvec,
3473 },
3474 {
3475 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3476 .procname = "regen_max_retry",
3477 .data = &ipv6_devconf.regen_max_retry,
3478 .maxlen = sizeof(int),
3479 .mode = 0644,
3480 .proc_handler = &proc_dointvec,
3481 },
3482 {
3483 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3484 .procname = "max_desync_factor",
3485 .data = &ipv6_devconf.max_desync_factor,
3486 .maxlen = sizeof(int),
3487 .mode = 0644,
3488 .proc_handler = &proc_dointvec,
3489 },
3490#endif
3491 {
3492 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3493 .procname = "max_addresses",
3494 .data = &ipv6_devconf.max_addresses,
3495 .maxlen = sizeof(int),
3496 .mode = 0644,
3497 .proc_handler = &proc_dointvec,
3498 },
3499 {
3500 .ctl_name = 0, /* sentinel */
3501 }
3502 },
3503 .addrconf_dev = {
3504 {
3505 .ctl_name = NET_PROTO_CONF_ALL,
3506 .procname = "all",
3507 .mode = 0555,
3508 .child = addrconf_sysctl.addrconf_vars,
3509 },
3510 {
3511 .ctl_name = 0, /* sentinel */
3512 }
3513 },
3514 .addrconf_conf_dir = {
3515 {
3516 .ctl_name = NET_IPV6_CONF,
3517 .procname = "conf",
3518 .mode = 0555,
3519 .child = addrconf_sysctl.addrconf_dev,
3520 },
3521 {
3522 .ctl_name = 0, /* sentinel */
3523 }
3524 },
3525 .addrconf_proto_dir = {
3526 {
3527 .ctl_name = NET_IPV6,
3528 .procname = "ipv6",
3529 .mode = 0555,
3530 .child = addrconf_sysctl.addrconf_conf_dir,
3531 },
3532 {
3533 .ctl_name = 0, /* sentinel */
3534 }
3535 },
3536 .addrconf_root_dir = {
3537 {
3538 .ctl_name = CTL_NET,
3539 .procname = "net",
3540 .mode = 0555,
3541 .child = addrconf_sysctl.addrconf_proto_dir,
3542 },
3543 {
3544 .ctl_name = 0, /* sentinel */
3545 }
3546 },
3547};
3548
3549static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3550{
3551 int i;
3552 struct net_device *dev = idev ? idev->dev : NULL;
3553 struct addrconf_sysctl_table *t;
3554 char *dev_name = NULL;
3555
3556 t = kmalloc(sizeof(*t), GFP_KERNEL);
3557 if (t == NULL)
3558 return;
3559 memcpy(t, &addrconf_sysctl, sizeof(*t));
3560 for (i=0; t->addrconf_vars[i].data; i++) {
3561 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3562 t->addrconf_vars[i].de = NULL;
3563 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3564 }
3565 if (dev) {
3566 dev_name = dev->name;
3567 t->addrconf_dev[0].ctl_name = dev->ifindex;
3568 } else {
3569 dev_name = "default";
3570 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3571 }
3572
3573 /*
3574 * Make a copy of dev_name, because '.procname' is regarded as const
3575 * by sysctl and we wouldn't want anyone to change it under our feet
3576 * (see SIOCSIFNAME).
3577 */
543537bd 3578 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 3579 if (!dev_name)
3580 goto free;
3581
3582 t->addrconf_dev[0].procname = dev_name;
3583
3584 t->addrconf_dev[0].child = t->addrconf_vars;
3585 t->addrconf_dev[0].de = NULL;
3586 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3587 t->addrconf_conf_dir[0].de = NULL;
3588 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3589 t->addrconf_proto_dir[0].de = NULL;
3590 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3591 t->addrconf_root_dir[0].de = NULL;
3592
3593 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3594 if (t->sysctl_header == NULL)
3595 goto free_procname;
3596 else
3597 p->sysctl = t;
3598 return;
3599
3600 /* error path */
3601 free_procname:
3602 kfree(dev_name);
3603 free:
3604 kfree(t);
3605
3606 return;
3607}
3608
3609static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3610{
3611 if (p->sysctl) {
3612 struct addrconf_sysctl_table *t = p->sysctl;
3613 p->sysctl = NULL;
3614 unregister_sysctl_table(t->sysctl_header);
3615 kfree(t->addrconf_dev[0].procname);
3616 kfree(t);
3617 }
3618}
3619
3620
3621#endif
3622
3623/*
3624 * Device notifier
3625 */
3626
3627int register_inet6addr_notifier(struct notifier_block *nb)
3628{
3629 return notifier_chain_register(&inet6addr_chain, nb);
3630}
3631
3632int unregister_inet6addr_notifier(struct notifier_block *nb)
3633{
3634 return notifier_chain_unregister(&inet6addr_chain,nb);
3635}
3636
3637/*
3638 * Init / cleanup code
3639 */
3640
3641int __init addrconf_init(void)
3642{
3643 int err = 0;
3644
3645 /* The addrconf netdev notifier requires that loopback_dev
3646 * has it's ipv6 private information allocated and setup
3647 * before it can bring up and give link-local addresses
3648 * to other devices which are up.
3649 *
3650 * Unfortunately, loopback_dev is not necessarily the first
3651 * entry in the global dev_base list of net devices. In fact,
3652 * it is likely to be the very last entry on that list.
3653 * So this causes the notifier registry below to try and
3654 * give link-local addresses to all devices besides loopback_dev
3655 * first, then loopback_dev, which cases all the non-loopback_dev
3656 * devices to fail to get a link-local address.
3657 *
3658 * So, as a temporary fix, allocate the ipv6 structure for
3659 * loopback_dev first by hand.
3660 * Longer term, all of the dependencies ipv6 has upon the loopback
3661 * device and it being up should be removed.
3662 */
3663 rtnl_lock();
3664 if (!ipv6_add_dev(&loopback_dev))
3665 err = -ENOMEM;
3666 rtnl_unlock();
3667 if (err)
3668 return err;
3669
c62dba90
HX		 3670 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3671
1da177e4
LT		 3672 register_netdevice_notifier(&ipv6_dev_notf);
3673
3674#ifdef CONFIG_IPV6_PRIVACY
3675 md5_tfm = crypto_alloc_tfm("md5", 0);
3676 if (unlikely(md5_tfm == NULL))
3677 printk(KERN_WARNING
3678 "failed to load transform for md5\n");
3679#endif
3680
3681 addrconf_verify(0);
3682 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3683#ifdef CONFIG_SYSCTL
3684 addrconf_sysctl.sysctl_header =
3685 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3686 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3687#endif
3688
3689 return 0;
3690}
3691
3692void __exit addrconf_cleanup(void)
3693{
3694 struct net_device *dev;
3695 struct inet6_dev *idev;
3696 struct inet6_ifaddr *ifa;
3697 int i;
3698
3699 unregister_netdevice_notifier(&ipv6_dev_notf);
3700
3701 rtnetlink_links[PF_INET6] = NULL;
3702#ifdef CONFIG_SYSCTL
3703 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3704 addrconf_sysctl_unregister(&ipv6_devconf);
3705#endif
3706
3707 rtnl_lock();
3708
3709 /*
3710 * clean dev list.
3711 */
3712
3713 for (dev=dev_base; dev; dev=dev->next) {
3714 if ((idev = __in6_dev_get(dev)) == NULL)
3715 continue;
3716 addrconf_ifdown(dev, 1);
3717 }
3718 addrconf_ifdown(&loopback_dev, 2);
3719
3720 /*
3721 * Check hash table.
3722 */
3723
3724 write_lock_bh(&addrconf_hash_lock);
3725 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3726 for (ifa=inet6_addr_lst[i]; ifa; ) {
3727 struct inet6_ifaddr *bifa;
3728
3729 bifa = ifa;
3730 ifa = ifa->lst_next;
3731 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3732 /* Do not free it; something is wrong.
3733 Now we can investigate it with debugger.
3734 */
3735 }
3736 }
3737 write_unlock_bh(&addrconf_hash_lock);
3738
3739 del_timer(&addr_chk_timer);
3740
3741 rtnl_unlock();
3742
3743#ifdef CONFIG_IPV6_PRIVACY
573dbd95
JJ		 3744 crypto_free_tfm(md5_tfm);
3745 md5_tfm = NULL;
1da177e4
LT		 3746#endif
3747
3748#ifdef CONFIG_PROC_FS
3749 proc_net_remove("if_inet6");
3750#endif
3751}
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