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[IPV6]: Fix address deletion
[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
1d142804 637 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 638 if (ifa == ifp) {
639 *ifap = ifa->if_next;
640 __in6_ifa_put(ifp);
641 ifa->if_next = NULL;
642 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
643 break;
644 deleted = 1;
1d142804 645 continue;
1da177e4
LT		 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 }
1d142804 669 ifap = &ifa->if_next;
1da177e4
LT		 670 }
671 write_unlock_bh(&idev->lock);
672
673 ipv6_ifa_notify(RTM_DELADDR, ifp);
674
675 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
676
677 addrconf_del_timer(ifp);
678
679 /*
680 * Purge or update corresponding prefix
681 *
682 * 1) we don't purge prefix here if address was not permanent.
683 * prefix is managed by its own lifetime.
684 * 2) if there're no addresses, delete prefix.
685 * 3) if there're still other permanent address(es),
686 * corresponding prefix is still permanent.
687 * 4) otherwise, update prefix lifetime to the
688 * longest valid lifetime among the corresponding
689 * addresses on the device.
690 * Note: subsequent RA will update lifetime.
691 *
692 * --yoshfuji
693 */
694 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
695 struct in6_addr prefix;
696 struct rt6_info *rt;
697
698 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
699 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
700
701 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
702 if (onlink == 0) {
0d51aa80 703 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 704 rt = NULL;
705 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
706 rt->rt6i_expires = expires;
707 rt->rt6i_flags |= RTF_EXPIRES;
708 }
709 }
710 dst_release(&rt->u.dst);
711 }
712
713 in6_ifa_put(ifp);
714}
715
716#ifdef CONFIG_IPV6_PRIVACY
717static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
718{
719 struct inet6_dev *idev = ifp->idev;
720 struct in6_addr addr, *tmpaddr;
721 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
722 int tmp_plen;
723 int ret = 0;
724 int max_addresses;
725
726 write_lock(&idev->lock);
727 if (ift) {
728 spin_lock_bh(&ift->lock);
729 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
730 spin_unlock_bh(&ift->lock);
731 tmpaddr = &addr;
732 } else {
733 tmpaddr = NULL;
734 }
735retry:
736 in6_dev_hold(idev);
737 if (idev->cnf.use_tempaddr <= 0) {
738 write_unlock(&idev->lock);
739 printk(KERN_INFO
740 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
741 in6_dev_put(idev);
742 ret = -1;
743 goto out;
744 }
745 spin_lock_bh(&ifp->lock);
746 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
747 idev->cnf.use_tempaddr = -1; /*XXX*/
748 spin_unlock_bh(&ifp->lock);
749 write_unlock(&idev->lock);
750 printk(KERN_WARNING
751 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
752 in6_dev_put(idev);
753 ret = -1;
754 goto out;
755 }
756 in6_ifa_hold(ifp);
757 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
758 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
759 spin_unlock_bh(&ifp->lock);
760 write_unlock(&idev->lock);
761 printk(KERN_WARNING
762 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
763 in6_ifa_put(ifp);
764 in6_dev_put(idev);
765 ret = -1;
766 goto out;
767 }
768 memcpy(&addr.s6_addr[8], idev->rndid, 8);
769 tmp_valid_lft = min_t(__u32,
770 ifp->valid_lft,
771 idev->cnf.temp_valid_lft);
772 tmp_prefered_lft = min_t(__u32,
773 ifp->prefered_lft,
774 idev->cnf.temp_prefered_lft - desync_factor / HZ);
775 tmp_plen = ifp->prefix_len;
776 max_addresses = idev->cnf.max_addresses;
777 tmp_cstamp = ifp->cstamp;
778 tmp_tstamp = ifp->tstamp;
779 spin_unlock_bh(&ifp->lock);
780
781 write_unlock(&idev->lock);
782 ift = !max_addresses ||
783 ipv6_count_addresses(idev) < max_addresses ?
784 ipv6_add_addr(idev, &addr, tmp_plen,
785 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
786 if (!ift || IS_ERR(ift)) {
787 in6_ifa_put(ifp);
788 in6_dev_put(idev);
789 printk(KERN_INFO
790 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
791 tmpaddr = &addr;
792 write_lock(&idev->lock);
793 goto retry;
794 }
795
796 spin_lock_bh(&ift->lock);
797 ift->ifpub = ifp;
798 ift->valid_lft = tmp_valid_lft;
799 ift->prefered_lft = tmp_prefered_lft;
800 ift->cstamp = tmp_cstamp;
801 ift->tstamp = tmp_tstamp;
802 spin_unlock_bh(&ift->lock);
803
804 addrconf_dad_start(ift, 0);
805 in6_ifa_put(ift);
806 in6_dev_put(idev);
807out:
808 return ret;
809}
810#endif
811
812/*
072047e4 813 * Choose an appropriate source address (RFC3484)
1da177e4 814 */
072047e4
YH		 815struct ipv6_saddr_score {
816 int addr_type;
817 unsigned int attrs;
818 int matchlen;
819 unsigned int scope;
820 unsigned int rule;
821};
822
823#define IPV6_SADDR_SCORE_LOCAL 0x0001
824#define IPV6_SADDR_SCORE_PREFERRED 0x0004
825#define IPV6_SADDR_SCORE_HOA 0x0008
826#define IPV6_SADDR_SCORE_OIF 0x0010
827#define IPV6_SADDR_SCORE_LABEL 0x0020
828#define IPV6_SADDR_SCORE_PRIVACY 0x0040
829
830static int inline ipv6_saddr_preferred(int type)
1da177e4 831{
072047e4
YH		 832 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
833 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
834 return 1;
835 return 0;
1da177e4
LT		 836}
837
072047e4
YH		 838/* static matching label */
839static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
840{
841 /*
842 * prefix (longest match) label
843 * -----------------------------
844 * ::1/128 0
845 * ::/0 1
846 * 2002::/16 2
847 * ::/96 3
848 * ::ffff:0:0/96 4
849 */
850 if (type & IPV6_ADDR_LOOPBACK)
851 return 0;
852 else if (type & IPV6_ADDR_COMPATv4)
853 return 3;
854 else if (type & IPV6_ADDR_MAPPED)
855 return 4;
856 else if (addr->s6_addr16[0] == htons(0x2002))
857 return 2;
858 return 1;
859}
1da177e4 860
072047e4 861int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 862 struct in6_addr *daddr, struct in6_addr *saddr)
863{
072047e4
YH		 864 struct ipv6_saddr_score hiscore;
865 struct inet6_ifaddr *ifa_result = NULL;
866 int daddr_type = __ipv6_addr_type(daddr);
867 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
868 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
869 struct net_device *dev;
1da177e4 870
072047e4 871 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 872
072047e4
YH		 873 read_lock(&dev_base_lock);
874 read_lock(&addrconf_lock);
1da177e4 875
072047e4
YH		 876 for (dev = dev_base; dev; dev=dev->next) {
877 struct inet6_dev *idev;
878 struct inet6_ifaddr *ifa;
879
880 /* Rule 0: Candidate Source Address (section 4)
881 * - multicast and link-local destination address,
882 * the set of candidate source address MUST only
883 * include addresses assigned to interfaces
884 * belonging to the same link as the outgoing
885 * interface.
886 * (- For site-local destination addresses, the
887 * set of candidate source addresses MUST only
888 * include addresses assigned to interfaces
889 * belonging to the same site as the outgoing
890 * interface.)
891 */
892 if ((daddr_type & IPV6_ADDR_MULTICAST ||
893 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
894 daddr_dev && dev != daddr_dev)
895 continue;
1da177e4 896
1da177e4 897 idev = __in6_dev_get(dev);
072047e4
YH		 898 if (!idev)
899 continue;
900
901 read_lock_bh(&idev->lock);
902 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
903 struct ipv6_saddr_score score;
904
905 score.addr_type = __ipv6_addr_type(&ifa->addr);
906
907 /* Rule 0: Candidate Source Address (section 4)
908 * - In any case, anycast addresses, multicast
909 * addresses, and the unspecified address MUST
910 * NOT be included in a candidate set.
911 */
912 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
913 score.addr_type & IPV6_ADDR_MULTICAST)) {
914 LIMIT_NETDEBUG(KERN_DEBUG
915 "ADDRCONF: unspecified / multicast address"
916 "assigned as unicast address on %s",
917 dev->name);
918 continue;
919 }
920
921 score.attrs = 0;
922 score.matchlen = 0;
923 score.scope = 0;
924 score.rule = 0;
925
926 if (ifa_result == NULL) {
927 /* record it if the first available entry */
928 goto record_it;
929 }
930
931 /* Rule 1: Prefer same address */
932 if (hiscore.rule < 1) {
933 if (ipv6_addr_equal(&ifa_result->addr, daddr))
934 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
935 hiscore.rule++;
936 }
937 if (ipv6_addr_equal(&ifa->addr, daddr)) {
938 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
939 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
940 score.rule = 1;
941 goto record_it;
1da177e4 942 }
072047e4
YH		 943 } else {
944 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
945 continue;
1da177e4 946 }
1da177e4 947
072047e4
YH		 948 /* Rule 2: Prefer appropriate scope */
949 if (hiscore.rule < 2) {
950 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
951 hiscore.rule++;
952 }
953 score.scope = __ipv6_addr_src_scope(score.addr_type);
954 if (hiscore.scope < score.scope) {
955 if (hiscore.scope < daddr_scope) {
956 score.rule = 2;
957 goto record_it;
958 } else
959 continue;
960 } else if (score.scope < hiscore.scope) {
961 if (score.scope < daddr_scope)
962 continue;
963 else {
964 score.rule = 2;
965 goto record_it;
966 }
967 }
1da177e4 968
072047e4
YH		 969 /* Rule 3: Avoid deprecated address */
970 if (hiscore.rule < 3) {
971 if (ipv6_saddr_preferred(hiscore.addr_type) ||
972 !(ifa_result->flags & IFA_F_DEPRECATED))
973 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
974 hiscore.rule++;
975 }
976 if (ipv6_saddr_preferred(score.addr_type) ||
977 !(ifa->flags & IFA_F_DEPRECATED)) {
978 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
979 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
980 score.rule = 3;
981 goto record_it;
982 }
983 } else {
984 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
985 continue;
986 }
1da177e4 987
072047e4 988 /* Rule 4: Prefer home address -- not implemented yet */
220bbd74
YH		 989 if (hiscore.rule < 4)
990 hiscore.rule++;
072047e4
YH		 991
992 /* Rule 5: Prefer outgoing interface */
993 if (hiscore.rule < 5) {
994 if (daddr_dev == NULL ||
995 daddr_dev == ifa_result->idev->dev)
996 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
997 hiscore.rule++;
998 }
999 if (daddr_dev == NULL ||
1000 daddr_dev == ifa->idev->dev) {
1001 score.attrs |= IPV6_SADDR_SCORE_OIF;
1002 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1003 score.rule = 5;
1004 goto record_it;
1005 }
1006 } else {
1007 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1008 continue;
1009 }
1010
1011 /* Rule 6: Prefer matching label */
1012 if (hiscore.rule < 6) {
1013 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1014 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1015 hiscore.rule++;
1016 }
1017 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1018 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1019 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1020 score.rule = 6;
1021 goto record_it;
1da177e4 1022 }
072047e4
YH		 1023 } else {
1024 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1025 continue;
1026 }
1027
44fd0261 1028#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1029 /* Rule 7: Prefer public address
1030 * Note: prefer temprary address if use_tempaddr >= 2
1031 */
1032 if (hiscore.rule < 7) {
1033 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1034 (ifa_result->idev->cnf.use_tempaddr >= 2))
1035 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1036 hiscore.rule++;
1037 }
1038 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1039 (ifa->idev->cnf.use_tempaddr >= 2)) {
1040 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1041 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1042 score.rule = 7;
1043 goto record_it;
1044 }
1045 } else {
1046 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1047 continue;
1048 }
44fd0261 1049#endif
072047e4 1050 /* Rule 8: Use longest matching prefix */
12da2a43 1051 if (hiscore.rule < 8) {
072047e4 1052 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1053 hiscore.rule++;
1054 }
072047e4
YH		 1055 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1056 if (score.matchlen > hiscore.matchlen) {
1057 score.rule = 8;
1058 goto record_it;
1da177e4 1059 }
072047e4
YH		 1060#if 0
1061 else if (score.matchlen < hiscore.matchlen)
1062 continue;
1063#endif
1064
1065 /* Final Rule: choose first available one */
1066 continue;
1067record_it:
1068 if (ifa_result)
1069 in6_ifa_put(ifa_result);
1070 in6_ifa_hold(ifa);
1071 ifa_result = ifa;
1072 hiscore = score;
1da177e4 1073 }
072047e4 1074 read_unlock_bh(&idev->lock);
1da177e4 1075 }
1da177e4
LT		 1076 read_unlock(&addrconf_lock);
1077 read_unlock(&dev_base_lock);
1078
072047e4
YH		 1079 if (!ifa_result)
1080 return -EADDRNOTAVAIL;
1081
1082 ipv6_addr_copy(saddr, &ifa_result->addr);
1083 in6_ifa_put(ifa_result);
1084 return 0;
1da177e4
LT		 1085}
1086
1087
1088int ipv6_get_saddr(struct dst_entry *dst,
1089 struct in6_addr *daddr, struct in6_addr *saddr)
1090{
1091 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1092}
1093
1094
1095int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1096{
1097 struct inet6_dev *idev;
1098 int err = -EADDRNOTAVAIL;
1099
1100 read_lock(&addrconf_lock);
1101 if ((idev = __in6_dev_get(dev)) != NULL) {
1102 struct inet6_ifaddr *ifp;
1103
1104 read_lock_bh(&idev->lock);
1105 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1106 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1107 ipv6_addr_copy(addr, &ifp->addr);
1108 err = 0;
1109 break;
1110 }
1111 }
1112 read_unlock_bh(&idev->lock);
1113 }
1114 read_unlock(&addrconf_lock);
1115 return err;
1116}
1117
1118static int ipv6_count_addresses(struct inet6_dev *idev)
1119{
1120 int cnt = 0;
1121 struct inet6_ifaddr *ifp;
1122
1123 read_lock_bh(&idev->lock);
1124 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1125 cnt++;
1126 read_unlock_bh(&idev->lock);
1127 return cnt;
1128}
1129
1130int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1131{
1132 struct inet6_ifaddr * ifp;
1133 u8 hash = ipv6_addr_hash(addr);
1134
1135 read_lock_bh(&addrconf_hash_lock);
1136 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1137 if (ipv6_addr_equal(&ifp->addr, addr) &&
1138 !(ifp->flags&IFA_F_TENTATIVE)) {
1139 if (dev == NULL || ifp->idev->dev == dev ||
1140 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1141 break;
1142 }
1143 }
1144 read_unlock_bh(&addrconf_hash_lock);
1145 return ifp != NULL;
1146}
1147
1148static
1149int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1150{
1151 struct inet6_ifaddr * ifp;
1152 u8 hash = ipv6_addr_hash(addr);
1153
1154 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1155 if (ipv6_addr_equal(&ifp->addr, addr)) {
1156 if (dev == NULL || ifp->idev->dev == dev)
1157 break;
1158 }
1159 }
1160 return ifp != NULL;
1161}
1162
1163struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1164{
1165 struct inet6_ifaddr * ifp;
1166 u8 hash = ipv6_addr_hash(addr);
1167
1168 read_lock_bh(&addrconf_hash_lock);
1169 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1170 if (ipv6_addr_equal(&ifp->addr, addr)) {
1171 if (dev == NULL || ifp->idev->dev == dev ||
1172 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1173 in6_ifa_hold(ifp);
1174 break;
1175 }
1176 }
1177 }
1178 read_unlock_bh(&addrconf_hash_lock);
1179
1180 return ifp;
1181}
1182
1183int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1184{
1185 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1186 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1187 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
8feaf0c0 1188 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1189 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1190 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1191 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1192 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1193
1194 if (!sk2_rcv_saddr && !sk_ipv6only)
1195 return 1;
1196
1197 if (addr_type2 == IPV6_ADDR_ANY &&
1198 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1199 return 1;
1200
1201 if (addr_type == IPV6_ADDR_ANY &&
1202 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1203 return 1;
1204
1205 if (sk2_rcv_saddr6 &&
1206 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1207 return 1;
1208
1209 if (addr_type == IPV6_ADDR_MAPPED &&
1210 !sk2_ipv6only &&
1211 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1212 return 1;
1213
1214 return 0;
1215}
1216
1217/* Gets referenced address, destroys ifaddr */
1218
1219void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1220{
1221 if (net_ratelimit())
1222 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1223 if (ifp->flags&IFA_F_PERMANENT) {
1224 spin_lock_bh(&ifp->lock);
1225 addrconf_del_timer(ifp);
1226 ifp->flags |= IFA_F_TENTATIVE;
1227 spin_unlock_bh(&ifp->lock);
1228 in6_ifa_put(ifp);
1229#ifdef CONFIG_IPV6_PRIVACY
1230 } else if (ifp->flags&IFA_F_TEMPORARY) {
1231 struct inet6_ifaddr *ifpub;
1232 spin_lock_bh(&ifp->lock);
1233 ifpub = ifp->ifpub;
1234 if (ifpub) {
1235 in6_ifa_hold(ifpub);
1236 spin_unlock_bh(&ifp->lock);
1237 ipv6_create_tempaddr(ifpub, ifp);
1238 in6_ifa_put(ifpub);
1239 } else {
1240 spin_unlock_bh(&ifp->lock);
1241 }
1242 ipv6_del_addr(ifp);
1243#endif
1244 } else
1245 ipv6_del_addr(ifp);
1246}
1247
1248
1249/* Join to solicited addr multicast group. */
1250
1251void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1252{
1253 struct in6_addr maddr;
1254
1255 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1256 return;
1257
1258 addrconf_addr_solict_mult(addr, &maddr);
1259 ipv6_dev_mc_inc(dev, &maddr);
1260}
1261
1262void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1263{
1264 struct in6_addr maddr;
1265
1266 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1267 return;
1268
1269 addrconf_addr_solict_mult(addr, &maddr);
1270 __ipv6_dev_mc_dec(idev, &maddr);
1271}
1272
20380731 1273static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1274{
1275 struct in6_addr addr;
1276 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1277 if (ipv6_addr_any(&addr))
1278 return;
1279 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1280}
1281
20380731 1282static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1283{
1284 struct in6_addr addr;
1285 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1286 if (ipv6_addr_any(&addr))
1287 return;
1288 __ipv6_dev_ac_dec(ifp->idev, &addr);
1289}
1290
1291static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1292{
1293 switch (dev->type) {
1294 case ARPHRD_ETHER:
1295 case ARPHRD_FDDI:
1296 case ARPHRD_IEEE802_TR:
1297 if (dev->addr_len != ETH_ALEN)
1298 return -1;
1299 memcpy(eui, dev->dev_addr, 3);
1300 memcpy(eui + 5, dev->dev_addr + 3, 3);
1301
1302 /*
1303 * The zSeries OSA network cards can be shared among various
1304 * OS instances, but the OSA cards have only one MAC address.
1305 * This leads to duplicate address conflicts in conjunction
1306 * with IPv6 if more than one instance uses the same card.
1307 *
1308 * The driver for these cards can deliver a unique 16-bit
1309 * identifier for each instance sharing the same card. It is
1310 * placed instead of 0xFFFE in the interface identifier. The
1311 * "u" bit of the interface identifier is not inverted in this
1312 * case. Hence the resulting interface identifier has local
1313 * scope according to RFC2373.
1314 */
1315 if (dev->dev_id) {
1316 eui[3] = (dev->dev_id >> 8) & 0xFF;
1317 eui[4] = dev->dev_id & 0xFF;
1318 } else {
1319 eui[3] = 0xFF;
1320 eui[4] = 0xFE;
1321 eui[0] ^= 2;
1322 }
1323 return 0;
1324 case ARPHRD_ARCNET:
1325 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1326 if (dev->addr_len != ARCNET_ALEN)
1327 return -1;
1328 memset(eui, 0, 7);
1329 eui[7] = *(u8*)dev->dev_addr;
1330 return 0;
1331 case ARPHRD_INFINIBAND:
1332 if (dev->addr_len != INFINIBAND_ALEN)
1333 return -1;
1334 memcpy(eui, dev->dev_addr + 12, 8);
1335 eui[0] |= 2;
1336 return 0;
1337 }
1338 return -1;
1339}
1340
1341static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1342{
1343 int err = -1;
1344 struct inet6_ifaddr *ifp;
1345
1346 read_lock_bh(&idev->lock);
1347 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1348 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1349 memcpy(eui, ifp->addr.s6_addr+8, 8);
1350 err = 0;
1351 break;
1352 }
1353 }
1354 read_unlock_bh(&idev->lock);
1355 return err;
1356}
1357
1358#ifdef CONFIG_IPV6_PRIVACY
1359/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1360static int __ipv6_regen_rndid(struct inet6_dev *idev)
1361{
1362 struct net_device *dev;
1363 struct scatterlist sg[2];
1364
378f058c
DH		 1365 sg_set_buf(&sg[0], idev->entropy, 8);
1366 sg_set_buf(&sg[1], idev->work_eui64, 8);
1da177e4
LT		 1367
1368 dev = idev->dev;
1369
1370 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1371 printk(KERN_INFO
1372 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1373 idev);
1374 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1375 }
1376regen:
1377 spin_lock(&md5_tfm_lock);
1378 if (unlikely(md5_tfm == NULL)) {
1379 spin_unlock(&md5_tfm_lock);
1380 return -1;
1381 }
1382 crypto_digest_init(md5_tfm);
1383 crypto_digest_update(md5_tfm, sg, 2);
1384 crypto_digest_final(md5_tfm, idev->work_digest);
1385 spin_unlock(&md5_tfm_lock);
1386
1387 memcpy(idev->rndid, &idev->work_digest[0], 8);
1388 idev->rndid[0] &= ~0x02;
1389 memcpy(idev->entropy, &idev->work_digest[8], 8);
1390
1391 /*
1392 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1393 * check if generated address is not inappropriate
1394 *
1395 * - Reserved subnet anycast (RFC 2526)
1396 * 11111101 11....11 1xxxxxxx
1397 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1398 * 00-00-5E-FE-xx-xx-xx-xx
1399 * - value 0
1400 * - XXX: already assigned to an address on the device
1401 */
1402 if (idev->rndid[0] == 0xfd &&
1403 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1404 (idev->rndid[7]&0x80))
1405 goto regen;
1406 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1407 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1408 goto regen;
1409 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1410 goto regen;
1411 }
1412
1413 return 0;
1414}
1415
1416static void ipv6_regen_rndid(unsigned long data)
1417{
1418 struct inet6_dev *idev = (struct inet6_dev *) data;
1419 unsigned long expires;
1420
1421 read_lock_bh(&addrconf_lock);
1422 write_lock_bh(&idev->lock);
1423
1424 if (idev->dead)
1425 goto out;
1426
1427 if (__ipv6_regen_rndid(idev) < 0)
1428 goto out;
1429
1430 expires = jiffies +
1431 idev->cnf.temp_prefered_lft * HZ -
1432 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1433 if (time_before(expires, jiffies)) {
1434 printk(KERN_WARNING
1435 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1436 idev->dev->name);
1437 goto out;
1438 }
1439
1440 if (!mod_timer(&idev->regen_timer, expires))
1441 in6_dev_hold(idev);
1442
1443out:
1444 write_unlock_bh(&idev->lock);
1445 read_unlock_bh(&addrconf_lock);
1446 in6_dev_put(idev);
1447}
1448
1449static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1450 int ret = 0;
1451
1452 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1453 ret = __ipv6_regen_rndid(idev);
1454 return ret;
1455}
1456#endif
1457
1458/*
1459 * Add prefix route.
1460 */
1461
1462static void
1463addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1464 unsigned long expires, u32 flags)
1da177e4
LT		 1465{
1466 struct in6_rtmsg rtmsg;
1467
1468 memset(&rtmsg, 0, sizeof(rtmsg));
1469 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1470 rtmsg.rtmsg_dst_len = plen;
1471 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1472 rtmsg.rtmsg_ifindex = dev->ifindex;
1473 rtmsg.rtmsg_info = expires;
1474 rtmsg.rtmsg_flags = RTF_UP|flags;
1475 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1476
1477 /* Prevent useless cloning on PtP SIT.
1478 This thing is done here expecting that the whole
1479 class of non-broadcast devices need not cloning.
1480 */
1481 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1482 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1483
0d51aa80 1484 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1485}
1486
1487/* Create "default" multicast route to the interface */
1488
1489static void addrconf_add_mroute(struct net_device *dev)
1490{
1491 struct in6_rtmsg rtmsg;
1492
1493 memset(&rtmsg, 0, sizeof(rtmsg));
1494 ipv6_addr_set(&rtmsg.rtmsg_dst,
1495 htonl(0xFF000000), 0, 0, 0);
1496 rtmsg.rtmsg_dst_len = 8;
1497 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1498 rtmsg.rtmsg_ifindex = dev->ifindex;
1499 rtmsg.rtmsg_flags = RTF_UP;
1500 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
0d51aa80 1501 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1502}
1503
1504static void sit_route_add(struct net_device *dev)
1505{
1506 struct in6_rtmsg rtmsg;
1507
1508 memset(&rtmsg, 0, sizeof(rtmsg));
1509
1510 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1511 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1512
1513 /* prefix length - 96 bits "::d.d.d.d" */
1514 rtmsg.rtmsg_dst_len = 96;
1515 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1516 rtmsg.rtmsg_ifindex = dev->ifindex;
1517
0d51aa80 1518 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1519}
1520
1521static void addrconf_add_lroute(struct net_device *dev)
1522{
1523 struct in6_addr addr;
1524
1525 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1526 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1527}
1528
1529static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1530{
1531 struct inet6_dev *idev;
1532
1533 ASSERT_RTNL();
1534
1535 if ((idev = ipv6_find_idev(dev)) == NULL)
1536 return NULL;
1537
1538 /* Add default multicast route */
1539 addrconf_add_mroute(dev);
1540
1541 /* Add link local route */
1542 addrconf_add_lroute(dev);
1543 return idev;
1544}
1545
1546void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1547{
1548 struct prefix_info *pinfo;
1549 __u32 valid_lft;
1550 __u32 prefered_lft;
1551 int addr_type;
1552 unsigned long rt_expires;
1553 struct inet6_dev *in6_dev;
1554
1555 pinfo = (struct prefix_info *) opt;
1556
1557 if (len < sizeof(struct prefix_info)) {
1558 ADBG(("addrconf: prefix option too short\n"));
1559 return;
1560 }
1561
1562 /*
1563 * Validation checks ([ADDRCONF], page 19)
1564 */
1565
1566 addr_type = ipv6_addr_type(&pinfo->prefix);
1567
1568 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1569 return;
1570
1571 valid_lft = ntohl(pinfo->valid);
1572 prefered_lft = ntohl(pinfo->prefered);
1573
1574 if (prefered_lft > valid_lft) {
1575 if (net_ratelimit())
1576 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1577 return;
1578 }
1579
1580 in6_dev = in6_dev_get(dev);
1581
1582 if (in6_dev == NULL) {
1583 if (net_ratelimit())
1584 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1585 return;
1586 }
1587
1588 /*
1589 * Two things going on here:
1590 * 1) Add routes for on-link prefixes
1591 * 2) Configure prefixes with the auto flag set
1592 */
1593
1594 /* Avoid arithmetic overflow. Really, we could
1595 save rt_expires in seconds, likely valid_lft,
1596 but it would require division in fib gc, that it
1597 not good.
1598 */
1599 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1600 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1601 else
3dd4bc68
YH		 1602 rt_expires = valid_lft * HZ;
1603
1604 /*
1605 * We convert this (in jiffies) to clock_t later.
1606 * Avoid arithmetic overflow there as well.
1607 * Overflow can happen only if HZ < USER_HZ.
1608 */
1609 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1610 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1611
1612 if (pinfo->onlink) {
1613 struct rt6_info *rt;
1614 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1615
1616 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1617 if (rt->rt6i_flags&RTF_EXPIRES) {
1618 if (valid_lft == 0) {
0d51aa80 1619 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 1620 rt = NULL;
1621 } else {
3dd4bc68 1622 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1623 }
1624 }
1625 } else if (valid_lft) {
1626 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1627 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1628 }
1629 if (rt)
1630 dst_release(&rt->u.dst);
1631 }
1632
1633 /* Try to figure out our local address for this prefix */
1634
1635 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1636 struct inet6_ifaddr * ifp;
1637 struct in6_addr addr;
1638 int create = 0, update_lft = 0;
1639
1640 if (pinfo->prefix_len == 64) {
1641 memcpy(&addr, &pinfo->prefix, 8);
1642 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1643 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1644 in6_dev_put(in6_dev);
1645 return;
1646 }
1647 goto ok;
1648 }
1649 if (net_ratelimit())
1650 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1651 pinfo->prefix_len);
1652 in6_dev_put(in6_dev);
1653 return;
1654
1655ok:
1656
1657 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1658
1659 if (ifp == NULL && valid_lft) {
1660 int max_addresses = in6_dev->cnf.max_addresses;
1661
1662 /* Do not allow to create too much of autoconfigured
1663 * addresses; this would be too easy way to crash kernel.
1664 */
1665 if (!max_addresses ||
1666 ipv6_count_addresses(in6_dev) < max_addresses)
1667 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1668 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1669
1670 if (!ifp || IS_ERR(ifp)) {
1671 in6_dev_put(in6_dev);
1672 return;
1673 }
1674
1675 update_lft = create = 1;
1676 ifp->cstamp = jiffies;
1677 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1678 }
1679
1680 if (ifp) {
1681 int flags;
1682 unsigned long now;
1683#ifdef CONFIG_IPV6_PRIVACY
1684 struct inet6_ifaddr *ift;
1685#endif
1686 u32 stored_lft;
1687
1688 /* update lifetime (RFC2462 5.5.3 e) */
1689 spin_lock(&ifp->lock);
1690 now = jiffies;
1691 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1692 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1693 else
1694 stored_lft = 0;
1695 if (!update_lft && stored_lft) {
1696 if (valid_lft > MIN_VALID_LIFETIME ||
1697 valid_lft > stored_lft)
1698 update_lft = 1;
1699 else if (stored_lft <= MIN_VALID_LIFETIME) {
1700 /* valid_lft <= stored_lft is always true */
1701 /* XXX: IPsec */
1702 update_lft = 0;
1703 } else {
1704 valid_lft = MIN_VALID_LIFETIME;
1705 if (valid_lft < prefered_lft)
1706 prefered_lft = valid_lft;
1707 update_lft = 1;
1708 }
1709 }
1710
1711 if (update_lft) {
1712 ifp->valid_lft = valid_lft;
1713 ifp->prefered_lft = prefered_lft;
1714 ifp->tstamp = now;
1715 flags = ifp->flags;
1716 ifp->flags &= ~IFA_F_DEPRECATED;
1717 spin_unlock(&ifp->lock);
1718
1719 if (!(flags&IFA_F_TENTATIVE))
1720 ipv6_ifa_notify(0, ifp);
1721 } else
1722 spin_unlock(&ifp->lock);
1723
1724#ifdef CONFIG_IPV6_PRIVACY
1725 read_lock_bh(&in6_dev->lock);
1726 /* update all temporary addresses in the list */
1727 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1728 /*
1729 * When adjusting the lifetimes of an existing
1730 * temporary address, only lower the lifetimes.
1731 * Implementations must not increase the
1732 * lifetimes of an existing temporary address
1733 * when processing a Prefix Information Option.
1734 */
1735 spin_lock(&ift->lock);
1736 flags = ift->flags;
1737 if (ift->valid_lft > valid_lft &&
1738 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1739 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1740 if (ift->prefered_lft > prefered_lft &&
1741 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1742 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1743 spin_unlock(&ift->lock);
1744 if (!(flags&IFA_F_TENTATIVE))
1745 ipv6_ifa_notify(0, ift);
1746 }
1747
1748 if (create && in6_dev->cnf.use_tempaddr > 0) {
1749 /*
1750 * When a new public address is created as described in [ADDRCONF],
1751 * also create a new temporary address.
1752 */
1753 read_unlock_bh(&in6_dev->lock);
1754 ipv6_create_tempaddr(ifp, NULL);
1755 } else {
1756 read_unlock_bh(&in6_dev->lock);
1757 }
1758#endif
1759 in6_ifa_put(ifp);
1760 addrconf_verify(0);
1761 }
1762 }
1763 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1764 in6_dev_put(in6_dev);
1765}
1766
1767/*
1768 * Set destination address.
1769 * Special case for SIT interfaces where we create a new "virtual"
1770 * device.
1771 */
1772int addrconf_set_dstaddr(void __user *arg)
1773{
1774 struct in6_ifreq ireq;
1775 struct net_device *dev;
1776 int err = -EINVAL;
1777
1778 rtnl_lock();
1779
1780 err = -EFAULT;
1781 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1782 goto err_exit;
1783
1784 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1785
1786 err = -ENODEV;
1787 if (dev == NULL)
1788 goto err_exit;
1789
1790 if (dev->type == ARPHRD_SIT) {
1791 struct ifreq ifr;
1792 mm_segment_t oldfs;
1793 struct ip_tunnel_parm p;
1794
1795 err = -EADDRNOTAVAIL;
1796 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1797 goto err_exit;
1798
1799 memset(&p, 0, sizeof(p));
1800 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1801 p.iph.saddr = 0;
1802 p.iph.version = 4;
1803 p.iph.ihl = 5;
1804 p.iph.protocol = IPPROTO_IPV6;
1805 p.iph.ttl = 64;
1806 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1807
1808 oldfs = get_fs(); set_fs(KERNEL_DS);
1809 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1810 set_fs(oldfs);
1811
1812 if (err == 0) {
1813 err = -ENOBUFS;
1814 if ((dev = __dev_get_by_name(p.name)) == NULL)
1815 goto err_exit;
1816 err = dev_open(dev);
1817 }
1818 }
1819
1820err_exit:
1821 rtnl_unlock();
1822 return err;
1823}
1824
1825/*
1826 * Manual configuration of address on an interface
1827 */
1828static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1829{
1830 struct inet6_ifaddr *ifp;
1831 struct inet6_dev *idev;
1832 struct net_device *dev;
1833 int scope;
1834
1835 ASSERT_RTNL();
1836
1837 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1838 return -ENODEV;
1839
1840 if (!(dev->flags&IFF_UP))
1841 return -ENETDOWN;
1842
1843 if ((idev = addrconf_add_dev(dev)) == NULL)
1844 return -ENOBUFS;
1845
1846 scope = ipv6_addr_scope(pfx);
1847
1848 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1849 if (!IS_ERR(ifp)) {
1850 addrconf_dad_start(ifp, 0);
1851 in6_ifa_put(ifp);
1852 return 0;
1853 }
1854
1855 return PTR_ERR(ifp);
1856}
1857
1858static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1859{
1860 struct inet6_ifaddr *ifp;
1861 struct inet6_dev *idev;
1862 struct net_device *dev;
1863
1864 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1865 return -ENODEV;
1866
1867 if ((idev = __in6_dev_get(dev)) == NULL)
1868 return -ENXIO;
1869
1870 read_lock_bh(&idev->lock);
1871 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1872 if (ifp->prefix_len == plen &&
1873 ipv6_addr_equal(pfx, &ifp->addr)) {
1874 in6_ifa_hold(ifp);
1875 read_unlock_bh(&idev->lock);
1876
1877 ipv6_del_addr(ifp);
1878
1879 /* If the last address is deleted administratively,
1880 disable IPv6 on this interface.
1881 */
1882 if (idev->addr_list == NULL)
1883 addrconf_ifdown(idev->dev, 1);
1884 return 0;
1885 }
1886 }
1887 read_unlock_bh(&idev->lock);
1888 return -EADDRNOTAVAIL;
1889}
1890
1891
1892int addrconf_add_ifaddr(void __user *arg)
1893{
1894 struct in6_ifreq ireq;
1895 int err;
1896
1897 if (!capable(CAP_NET_ADMIN))
1898 return -EPERM;
1899
1900 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1901 return -EFAULT;
1902
1903 rtnl_lock();
1904 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1905 rtnl_unlock();
1906 return err;
1907}
1908
1909int addrconf_del_ifaddr(void __user *arg)
1910{
1911 struct in6_ifreq ireq;
1912 int err;
1913
1914 if (!capable(CAP_NET_ADMIN))
1915 return -EPERM;
1916
1917 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1918 return -EFAULT;
1919
1920 rtnl_lock();
1921 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1922 rtnl_unlock();
1923 return err;
1924}
1925
1926static void sit_add_v4_addrs(struct inet6_dev *idev)
1927{
1928 struct inet6_ifaddr * ifp;
1929 struct in6_addr addr;
1930 struct net_device *dev;
1931 int scope;
1932
1933 ASSERT_RTNL();
1934
1935 memset(&addr, 0, sizeof(struct in6_addr));
1936 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1937
1938 if (idev->dev->flags&IFF_POINTOPOINT) {
1939 addr.s6_addr32[0] = htonl(0xfe800000);
1940 scope = IFA_LINK;
1941 } else {
1942 scope = IPV6_ADDR_COMPATv4;
1943 }
1944
1945 if (addr.s6_addr32[3]) {
1946 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1947 if (!IS_ERR(ifp)) {
1948 spin_lock_bh(&ifp->lock);
1949 ifp->flags &= ~IFA_F_TENTATIVE;
1950 spin_unlock_bh(&ifp->lock);
1951 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1952 in6_ifa_put(ifp);
1953 }
1954 return;
1955 }
1956
1957 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 1958 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1959 if (in_dev && (dev->flags & IFF_UP)) {
1960 struct in_ifaddr * ifa;
1961
1962 int flag = scope;
1963
1964 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1965 int plen;
1966
1967 addr.s6_addr32[3] = ifa->ifa_local;
1968
1969 if (ifa->ifa_scope == RT_SCOPE_LINK)
1970 continue;
1971 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1972 if (idev->dev->flags&IFF_POINTOPOINT)
1973 continue;
1974 flag |= IFA_HOST;
1975 }
1976 if (idev->dev->flags&IFF_POINTOPOINT)
1977 plen = 64;
1978 else
1979 plen = 96;
1980
1981 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1982 IFA_F_PERMANENT);
1983 if (!IS_ERR(ifp)) {
1984 spin_lock_bh(&ifp->lock);
1985 ifp->flags &= ~IFA_F_TENTATIVE;
1986 spin_unlock_bh(&ifp->lock);
1987 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1988 in6_ifa_put(ifp);
1989 }
1990 }
1991 }
1992 }
1993}
1994
1995static void init_loopback(struct net_device *dev)
1996{
1997 struct inet6_dev *idev;
1998 struct inet6_ifaddr * ifp;
1999
2000 /* ::1 */
2001
2002 ASSERT_RTNL();
2003
2004 if ((idev = ipv6_find_idev(dev)) == NULL) {
2005 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2006 return;
2007 }
2008
2009 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2010 if (!IS_ERR(ifp)) {
2011 spin_lock_bh(&ifp->lock);
2012 ifp->flags &= ~IFA_F_TENTATIVE;
2013 spin_unlock_bh(&ifp->lock);
2014 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2015 in6_ifa_put(ifp);
2016 }
2017}
2018
2019static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2020{
2021 struct inet6_ifaddr * ifp;
2022
2023 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2024 if (!IS_ERR(ifp)) {
2025 addrconf_dad_start(ifp, 0);
2026 in6_ifa_put(ifp);
2027 }
2028}
2029
2030static void addrconf_dev_config(struct net_device *dev)
2031{
2032 struct in6_addr addr;
2033 struct inet6_dev * idev;
2034
2035 ASSERT_RTNL();
2036
2037 if ((dev->type != ARPHRD_ETHER) &&
2038 (dev->type != ARPHRD_FDDI) &&
2039 (dev->type != ARPHRD_IEEE802_TR) &&
2040 (dev->type != ARPHRD_ARCNET) &&
2041 (dev->type != ARPHRD_INFINIBAND)) {
2042 /* Alas, we support only Ethernet autoconfiguration. */
2043 return;
2044 }
2045
2046 idev = addrconf_add_dev(dev);
2047 if (idev == NULL)
2048 return;
2049
2050 memset(&addr, 0, sizeof(struct in6_addr));
2051 addr.s6_addr32[0] = htonl(0xFE800000);
2052
2053 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2054 addrconf_add_linklocal(idev, &addr);
2055}
2056
2057static void addrconf_sit_config(struct net_device *dev)
2058{
2059 struct inet6_dev *idev;
2060
2061 ASSERT_RTNL();
2062
2063 /*
2064 * Configure the tunnel with one of our IPv4
2065 * addresses... we should configure all of
2066 * our v4 addrs in the tunnel
2067 */
2068
2069 if ((idev = ipv6_find_idev(dev)) == NULL) {
2070 printk(KERN_DEBUG "init sit: add_dev failed\n");
2071 return;
2072 }
2073
2074 sit_add_v4_addrs(idev);
2075
2076 if (dev->flags&IFF_POINTOPOINT) {
2077 addrconf_add_mroute(dev);
2078 addrconf_add_lroute(dev);
2079 } else
2080 sit_route_add(dev);
2081}
2082
2083static inline int
2084ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2085{
2086 struct in6_addr lladdr;
2087
2088 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2089 addrconf_add_linklocal(idev, &lladdr);
2090 return 0;
2091 }
2092 return -1;
2093}
2094
2095static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2096{
2097 struct net_device *link_dev;
2098
2099 /* first try to inherit the link-local address from the link device */
2100 if (idev->dev->iflink &&
2101 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2102 if (!ipv6_inherit_linklocal(idev, link_dev))
2103 return;
2104 }
2105 /* then try to inherit it from any device */
2106 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2107 if (!ipv6_inherit_linklocal(idev, link_dev))
2108 return;
2109 }
2110 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2111}
2112
2113/*
2114 * Autoconfigure tunnel with a link-local address so routing protocols,
2115 * DHCPv6, MLD etc. can be run over the virtual link
2116 */
2117
2118static void addrconf_ip6_tnl_config(struct net_device *dev)
2119{
2120 struct inet6_dev *idev;
2121
2122 ASSERT_RTNL();
2123
2124 if ((idev = addrconf_add_dev(dev)) == NULL) {
2125 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2126 return;
2127 }
2128 ip6_tnl_add_linklocal(idev);
2129 addrconf_add_mroute(dev);
2130}
2131
2132static int addrconf_notify(struct notifier_block *this, unsigned long event,
2133 void * data)
2134{
2135 struct net_device *dev = (struct net_device *) data;
2136 struct inet6_dev *idev = __in6_dev_get(dev);
2137
2138 switch(event) {
2139 case NETDEV_UP:
2140 switch(dev->type) {
2141 case ARPHRD_SIT:
2142 addrconf_sit_config(dev);
2143 break;
2144 case ARPHRD_TUNNEL6:
2145 addrconf_ip6_tnl_config(dev);
2146 break;
2147 case ARPHRD_LOOPBACK:
2148 init_loopback(dev);
2149 break;
2150
2151 default:
2152 addrconf_dev_config(dev);
2153 break;
2154 };
2155 if (idev) {
2156 /* If the MTU changed during the interface down, when the
2157 interface up, the changed MTU must be reflected in the
2158 idev as well as routers.
2159 */
2160 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2161 rt6_mtu_change(dev, dev->mtu);
2162 idev->cnf.mtu6 = dev->mtu;
2163 }
2164 idev->tstamp = jiffies;
2165 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2166 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2167 stop IPv6 on this interface.
2168 */
2169 if (dev->mtu < IPV6_MIN_MTU)
2170 addrconf_ifdown(dev, event != NETDEV_DOWN);
2171 }
2172 break;
2173
2174 case NETDEV_CHANGEMTU:
2175 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2176 rt6_mtu_change(dev, dev->mtu);
2177 idev->cnf.mtu6 = dev->mtu;
2178 break;
2179 }
2180
2181 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2182
2183 case NETDEV_DOWN:
2184 case NETDEV_UNREGISTER:
2185 /*
2186 * Remove all addresses from this interface.
2187 */
2188 addrconf_ifdown(dev, event != NETDEV_DOWN);
2189 break;
2190 case NETDEV_CHANGE:
2191 break;
2192 case NETDEV_CHANGENAME:
2193#ifdef CONFIG_SYSCTL
2194 if (idev) {
2195 addrconf_sysctl_unregister(&idev->cnf);
2196 neigh_sysctl_unregister(idev->nd_parms);
2197 neigh_sysctl_register(dev, idev->nd_parms,
2198 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2199 &ndisc_ifinfo_sysctl_change,
2200 NULL);
2201 addrconf_sysctl_register(idev, &idev->cnf);
2202 }
2203#endif
2204 break;
2205 };
2206
2207 return NOTIFY_OK;
2208}
2209
2210/*
2211 * addrconf module should be notified of a device going up
2212 */
2213static struct notifier_block ipv6_dev_notf = {
2214 .notifier_call = addrconf_notify,
2215 .priority = 0
2216};
2217
2218static int addrconf_ifdown(struct net_device *dev, int how)
2219{
2220 struct inet6_dev *idev;
2221 struct inet6_ifaddr *ifa, **bifa;
2222 int i;
2223
2224 ASSERT_RTNL();
2225
2226 if (dev == &loopback_dev && how == 1)
2227 how = 0;
2228
2229 rt6_ifdown(dev);
2230 neigh_ifdown(&nd_tbl, dev);
2231
2232 idev = __in6_dev_get(dev);
2233 if (idev == NULL)
2234 return -ENODEV;
2235
2236 /* Step 1: remove reference to ipv6 device from parent device.
2237 Do not dev_put!
2238 */
2239 if (how == 1) {
2240 write_lock_bh(&addrconf_lock);
2241 dev->ip6_ptr = NULL;
2242 idev->dead = 1;
2243 write_unlock_bh(&addrconf_lock);
2244
2245 /* Step 1.5: remove snmp6 entry */
2246 snmp6_unregister_dev(idev);
2247
2248 }
2249
2250 /* Step 2: clear hash table */
2251 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2252 bifa = &inet6_addr_lst[i];
2253
2254 write_lock_bh(&addrconf_hash_lock);
2255 while ((ifa = *bifa) != NULL) {
2256 if (ifa->idev == idev) {
2257 *bifa = ifa->lst_next;
2258 ifa->lst_next = NULL;
2259 addrconf_del_timer(ifa);
2260 in6_ifa_put(ifa);
2261 continue;
2262 }
2263 bifa = &ifa->lst_next;
2264 }
2265 write_unlock_bh(&addrconf_hash_lock);
2266 }
2267
2268 write_lock_bh(&idev->lock);
2269
2270 /* Step 3: clear flags for stateless addrconf */
2271 if (how != 1)
2272 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD);
2273
2274 /* Step 4: clear address list */
2275#ifdef CONFIG_IPV6_PRIVACY
2276 if (how == 1 && del_timer(&idev->regen_timer))
2277 in6_dev_put(idev);
2278
2279 /* clear tempaddr list */
2280 while ((ifa = idev->tempaddr_list) != NULL) {
2281 idev->tempaddr_list = ifa->tmp_next;
2282 ifa->tmp_next = NULL;
2283 ifa->dead = 1;
2284 write_unlock_bh(&idev->lock);
2285 spin_lock_bh(&ifa->lock);
2286
2287 if (ifa->ifpub) {
2288 in6_ifa_put(ifa->ifpub);
2289 ifa->ifpub = NULL;
2290 }
2291 spin_unlock_bh(&ifa->lock);
2292 in6_ifa_put(ifa);
2293 write_lock_bh(&idev->lock);
2294 }
2295#endif
2296 while ((ifa = idev->addr_list) != NULL) {
2297 idev->addr_list = ifa->if_next;
2298 ifa->if_next = NULL;
2299 ifa->dead = 1;
2300 addrconf_del_timer(ifa);
2301 write_unlock_bh(&idev->lock);
2302
2303 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2304 in6_ifa_put(ifa);
2305
2306 write_lock_bh(&idev->lock);
2307 }
2308 write_unlock_bh(&idev->lock);
2309
2310 /* Step 5: Discard multicast list */
2311
2312 if (how == 1)
2313 ipv6_mc_destroy_dev(idev);
2314 else
2315 ipv6_mc_down(idev);
2316
2317 /* Step 5: netlink notification of this interface */
2318 idev->tstamp = jiffies;
979ad663 2319 inet6_ifinfo_notify(RTM_DELLINK, idev);
1da177e4
LT		 2320
2321 /* Shot the device (if unregistered) */
2322
2323 if (how == 1) {
2324#ifdef CONFIG_SYSCTL
2325 addrconf_sysctl_unregister(&idev->cnf);
2326 neigh_sysctl_unregister(idev->nd_parms);
2327#endif
2328 neigh_parms_release(&nd_tbl, idev->nd_parms);
2329 neigh_ifdown(&nd_tbl, dev);
2330 in6_dev_put(idev);
2331 }
2332 return 0;
2333}
2334
2335static void addrconf_rs_timer(unsigned long data)
2336{
2337 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2338
2339 if (ifp->idev->cnf.forwarding)
2340 goto out;
2341
2342 if (ifp->idev->if_flags & IF_RA_RCVD) {
2343 /*
2344 * Announcement received after solicitation
2345 * was sent
2346 */
2347 goto out;
2348 }
2349
2350 spin_lock(&ifp->lock);
2351 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2352 struct in6_addr all_routers;
2353
2354 /* The wait after the last probe can be shorter */
2355 addrconf_mod_timer(ifp, AC_RS,
2356 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2357 ifp->idev->cnf.rtr_solicit_delay :
2358 ifp->idev->cnf.rtr_solicit_interval);
2359 spin_unlock(&ifp->lock);
2360
2361 ipv6_addr_all_routers(&all_routers);
2362
2363 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2364 } else {
2365 spin_unlock(&ifp->lock);
2366 /*
2367 * Note: we do not support deprecated "all on-link"
2368 * assumption any longer.
2369 */
2370 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2371 ifp->idev->dev->name);
2372 }
2373
2374out:
2375 in6_ifa_put(ifp);
2376}
2377
2378/*
2379 * Duplicate Address Detection
2380 */
e431b8c0 2381static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2382{
2383 struct inet6_dev *idev = ifp->idev;
2384 struct net_device *dev = idev->dev;
2385 unsigned long rand_num;
2386
2387 addrconf_join_solict(dev, &ifp->addr);
2388
2389 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2390 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2391 flags);
2392
2393 net_srandom(ifp->addr.s6_addr32[3]);
2394 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2395
2396 read_lock_bh(&idev->lock);
2397 if (ifp->dead)
2398 goto out;
2399 spin_lock_bh(&ifp->lock);
2400
2401 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2402 !(ifp->flags&IFA_F_TENTATIVE)) {
2403 ifp->flags &= ~IFA_F_TENTATIVE;
2404 spin_unlock_bh(&ifp->lock);
2405 read_unlock_bh(&idev->lock);
2406
2407 addrconf_dad_completed(ifp);
2408 return;
2409 }
2410
2411 ifp->probes = idev->cnf.dad_transmits;
2412 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2413
2414 spin_unlock_bh(&ifp->lock);
2415out:
2416 read_unlock_bh(&idev->lock);
2417}
2418
2419static void addrconf_dad_timer(unsigned long data)
2420{
2421 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2422 struct inet6_dev *idev = ifp->idev;
2423 struct in6_addr unspec;
2424 struct in6_addr mcaddr;
2425
2426 read_lock_bh(&idev->lock);
2427 if (idev->dead) {
2428 read_unlock_bh(&idev->lock);
2429 goto out;
2430 }
2431 spin_lock_bh(&ifp->lock);
2432 if (ifp->probes == 0) {
2433 /*
2434 * DAD was successful
2435 */
2436
2437 ifp->flags &= ~IFA_F_TENTATIVE;
2438 spin_unlock_bh(&ifp->lock);
2439 read_unlock_bh(&idev->lock);
2440
2441 addrconf_dad_completed(ifp);
2442
2443 goto out;
2444 }
2445
2446 ifp->probes--;
2447 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2448 spin_unlock_bh(&ifp->lock);
2449 read_unlock_bh(&idev->lock);
2450
2451 /* send a neighbour solicitation for our addr */
2452 memset(&unspec, 0, sizeof(unspec));
2453 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2454 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2455out:
2456 in6_ifa_put(ifp);
2457}
2458
2459static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2460{
2461 struct net_device * dev = ifp->idev->dev;
2462
2463 /*
2464 * Configure the address for reception. Now it is valid.
2465 */
2466
2467 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2468
2469 /* If added prefix is link local and forwarding is off,
2470 start sending router solicitations.
2471 */
2472
2473 if (ifp->idev->cnf.forwarding == 0 &&
2474 ifp->idev->cnf.rtr_solicits > 0 &&
2475 (dev->flags&IFF_LOOPBACK) == 0 &&
2476 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2477 struct in6_addr all_routers;
2478
2479 ipv6_addr_all_routers(&all_routers);
2480
2481 /*
2482 * If a host as already performed a random delay
2483 * [...] as part of DAD [...] there is no need
2484 * to delay again before sending the first RS
2485 */
2486 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2487
2488 spin_lock_bh(&ifp->lock);
2489 ifp->probes = 1;
2490 ifp->idev->if_flags |= IF_RS_SENT;
2491 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2492 spin_unlock_bh(&ifp->lock);
2493 }
2494}
2495
2496#ifdef CONFIG_PROC_FS
2497struct if6_iter_state {
2498 int bucket;
2499};
2500
2501static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2502{
2503 struct inet6_ifaddr *ifa = NULL;
2504 struct if6_iter_state *state = seq->private;
2505
2506 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2507 ifa = inet6_addr_lst[state->bucket];
2508 if (ifa)
2509 break;
2510 }
2511 return ifa;
2512}
2513
2514static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2515{
2516 struct if6_iter_state *state = seq->private;
2517
2518 ifa = ifa->lst_next;
2519try_again:
2520 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2521 ifa = inet6_addr_lst[state->bucket];
2522 goto try_again;
2523 }
2524 return ifa;
2525}
2526
2527static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2528{
2529 struct inet6_ifaddr *ifa = if6_get_first(seq);
2530
2531 if (ifa)
2532 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2533 --pos;
2534 return pos ? NULL : ifa;
2535}
2536
2537static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2538{
2539 read_lock_bh(&addrconf_hash_lock);
2540 return if6_get_idx(seq, *pos);
2541}
2542
2543static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2544{
2545 struct inet6_ifaddr *ifa;
2546
2547 ifa = if6_get_next(seq, v);
2548 ++*pos;
2549 return ifa;
2550}
2551
2552static void if6_seq_stop(struct seq_file *seq, void *v)
2553{
2554 read_unlock_bh(&addrconf_hash_lock);
2555}
2556
2557static int if6_seq_show(struct seq_file *seq, void *v)
2558{
2559 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2560 seq_printf(seq,
2561 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2562 NIP6(ifp->addr),
2563 ifp->idev->dev->ifindex,
2564 ifp->prefix_len,
2565 ifp->scope,
2566 ifp->flags,
2567 ifp->idev->dev->name);
2568 return 0;
2569}
2570
2571static struct seq_operations if6_seq_ops = {
2572 .start = if6_seq_start,
2573 .next = if6_seq_next,
2574 .show = if6_seq_show,
2575 .stop = if6_seq_stop,
2576};
2577
2578static int if6_seq_open(struct inode *inode, struct file *file)
2579{
2580 struct seq_file *seq;
2581 int rc = -ENOMEM;
2582 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2583
2584 if (!s)
2585 goto out;
2586 memset(s, 0, sizeof(*s));
2587
2588 rc = seq_open(file, &if6_seq_ops);
2589 if (rc)
2590 goto out_kfree;
2591
2592 seq = file->private_data;
2593 seq->private = s;
2594out:
2595 return rc;
2596out_kfree:
2597 kfree(s);
2598 goto out;
2599}
2600
2601static struct file_operations if6_fops = {
2602 .owner = THIS_MODULE,
2603 .open = if6_seq_open,
2604 .read = seq_read,
2605 .llseek = seq_lseek,
2606 .release = seq_release_private,
2607};
2608
2609int __init if6_proc_init(void)
2610{
2611 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2612 return -ENOMEM;
2613 return 0;
2614}
2615
2616void if6_proc_exit(void)
2617{
2618 proc_net_remove("if_inet6");
2619}
2620#endif /* CONFIG_PROC_FS */
2621
2622/*
2623 * Periodic address status verification
2624 */
2625
2626static void addrconf_verify(unsigned long foo)
2627{
2628 struct inet6_ifaddr *ifp;
2629 unsigned long now, next;
2630 int i;
2631
2632 spin_lock_bh(&addrconf_verify_lock);
2633 now = jiffies;
2634 next = now + ADDR_CHECK_FREQUENCY;
2635
2636 del_timer(&addr_chk_timer);
2637
2638 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2639
2640restart:
5d5780df 2641 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2642 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2643 unsigned long age;
2644#ifdef CONFIG_IPV6_PRIVACY
2645 unsigned long regen_advance;
2646#endif
2647
2648 if (ifp->flags & IFA_F_PERMANENT)
2649 continue;
2650
2651 spin_lock(&ifp->lock);
2652 age = (now - ifp->tstamp) / HZ;
2653
2654#ifdef CONFIG_IPV6_PRIVACY
2655 regen_advance = ifp->idev->cnf.regen_max_retry *
2656 ifp->idev->cnf.dad_transmits *
2657 ifp->idev->nd_parms->retrans_time / HZ;
2658#endif
2659
2660 if (age >= ifp->valid_lft) {
2661 spin_unlock(&ifp->lock);
2662 in6_ifa_hold(ifp);
5d5780df 2663 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2664 ipv6_del_addr(ifp);
2665 goto restart;
2666 } else if (age >= ifp->prefered_lft) {
2667 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2668 int deprecate = 0;
2669
2670 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2671 deprecate = 1;
2672 ifp->flags |= IFA_F_DEPRECATED;
2673 }
2674
2675 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2676 next = ifp->tstamp + ifp->valid_lft * HZ;
2677
2678 spin_unlock(&ifp->lock);
2679
2680 if (deprecate) {
2681 in6_ifa_hold(ifp);
5d5780df 2682 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2683
2684 ipv6_ifa_notify(0, ifp);
2685 in6_ifa_put(ifp);
2686 goto restart;
2687 }
2688#ifdef CONFIG_IPV6_PRIVACY
2689 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2690 !(ifp->flags&IFA_F_TENTATIVE)) {
2691 if (age >= ifp->prefered_lft - regen_advance) {
2692 struct inet6_ifaddr *ifpub = ifp->ifpub;
2693 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2694 next = ifp->tstamp + ifp->prefered_lft * HZ;
2695 if (!ifp->regen_count && ifpub) {
2696 ifp->regen_count++;
2697 in6_ifa_hold(ifp);
2698 in6_ifa_hold(ifpub);
2699 spin_unlock(&ifp->lock);
5d5780df 2700 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2701 ipv6_create_tempaddr(ifpub, ifp);
2702 in6_ifa_put(ifpub);
2703 in6_ifa_put(ifp);
2704 goto restart;
2705 }
2706 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2707 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2708 spin_unlock(&ifp->lock);
2709#endif
2710 } else {
2711 /* ifp->prefered_lft <= ifp->valid_lft */
2712 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2713 next = ifp->tstamp + ifp->prefered_lft * HZ;
2714 spin_unlock(&ifp->lock);
2715 }
2716 }
5d5780df 2717 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2718 }
2719
2720 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2721 add_timer(&addr_chk_timer);
2722 spin_unlock_bh(&addrconf_verify_lock);
2723}
2724
2725static int
2726inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2727{
2728 struct rtattr **rta = arg;
2729 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2730 struct in6_addr *pfx;
2731
2732 pfx = NULL;
2733 if (rta[IFA_ADDRESS-1]) {
2734 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2735 return -EINVAL;
2736 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2737 }
2738 if (rta[IFA_LOCAL-1]) {
2739 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2740 return -EINVAL;
2741 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2742 }
2743 if (pfx == NULL)
2744 return -EINVAL;
2745
2746 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2747}
2748
2749static int
2750inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2751{
2752 struct rtattr **rta = arg;
2753 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2754 struct in6_addr *pfx;
2755
2756 pfx = NULL;
2757 if (rta[IFA_ADDRESS-1]) {
2758 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2759 return -EINVAL;
2760 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2761 }
2762 if (rta[IFA_LOCAL-1]) {
2763 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2764 return -EINVAL;
2765 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2766 }
2767 if (pfx == NULL)
2768 return -EINVAL;
2769
2770 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2771}
2772
2773static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 2774 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 2775{
2776 struct ifaddrmsg *ifm;
2777 struct nlmsghdr *nlh;
2778 struct ifa_cacheinfo ci;
2779 unsigned char *b = skb->tail;
2780
b6544c0b 2781 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2782 ifm = NLMSG_DATA(nlh);
2783 ifm->ifa_family = AF_INET6;
2784 ifm->ifa_prefixlen = ifa->prefix_len;
2785 ifm->ifa_flags = ifa->flags;
2786 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2787 if (ifa->scope&IFA_HOST)
2788 ifm->ifa_scope = RT_SCOPE_HOST;
2789 else if (ifa->scope&IFA_LINK)
2790 ifm->ifa_scope = RT_SCOPE_LINK;
2791 else if (ifa->scope&IFA_SITE)
2792 ifm->ifa_scope = RT_SCOPE_SITE;
2793 ifm->ifa_index = ifa->idev->dev->ifindex;
2794 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2795 if (!(ifa->flags&IFA_F_PERMANENT)) {
2796 ci.ifa_prefered = ifa->prefered_lft;
2797 ci.ifa_valid = ifa->valid_lft;
2798 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2799 long tval = (jiffies - ifa->tstamp)/HZ;
2800 ci.ifa_prefered -= tval;
2801 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2802 ci.ifa_valid -= tval;
2803 }
2804 } else {
2805 ci.ifa_prefered = INFINITY_LIFE_TIME;
2806 ci.ifa_valid = INFINITY_LIFE_TIME;
2807 }
2808 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2809 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2810 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2811 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2812 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2813 nlh->nlmsg_len = skb->tail - b;
2814 return skb->len;
2815
2816nlmsg_failure:
2817rtattr_failure:
2818 skb_trim(skb, b - skb->data);
2819 return -1;
2820}
2821
2822static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 2823 u32 pid, u32 seq, int event, u16 flags)
1da177e4
LT		 2824{
2825 struct ifaddrmsg *ifm;
2826 struct nlmsghdr *nlh;
2827 struct ifa_cacheinfo ci;
2828 unsigned char *b = skb->tail;
2829
b6544c0b 2830 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2831 ifm = NLMSG_DATA(nlh);
2832 ifm->ifa_family = AF_INET6;
2833 ifm->ifa_prefixlen = 128;
2834 ifm->ifa_flags = IFA_F_PERMANENT;
2835 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2836 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2837 ifm->ifa_scope = RT_SCOPE_SITE;
2838 ifm->ifa_index = ifmca->idev->dev->ifindex;
2839 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2840 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2841 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2842 * 100 / HZ);
2843 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2844 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2845 * 100 / HZ);
2846 ci.ifa_prefered = INFINITY_LIFE_TIME;
2847 ci.ifa_valid = INFINITY_LIFE_TIME;
2848 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2849 nlh->nlmsg_len = skb->tail - b;
2850 return skb->len;
2851
2852nlmsg_failure:
2853rtattr_failure:
2854 skb_trim(skb, b - skb->data);
2855 return -1;
2856}
2857
2858static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 2859 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 2860{
2861 struct ifaddrmsg *ifm;
2862 struct nlmsghdr *nlh;
2863 struct ifa_cacheinfo ci;
2864 unsigned char *b = skb->tail;
2865
b6544c0b 2866 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2867 ifm = NLMSG_DATA(nlh);
2868 ifm->ifa_family = AF_INET6;
2869 ifm->ifa_prefixlen = 128;
2870 ifm->ifa_flags = IFA_F_PERMANENT;
2871 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2872 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2873 ifm->ifa_scope = RT_SCOPE_SITE;
2874 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2875 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2876 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2877 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2878 * 100 / HZ);
2879 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2880 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2881 * 100 / HZ);
2882 ci.ifa_prefered = INFINITY_LIFE_TIME;
2883 ci.ifa_valid = INFINITY_LIFE_TIME;
2884 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2885 nlh->nlmsg_len = skb->tail - b;
2886 return skb->len;
2887
2888nlmsg_failure:
2889rtattr_failure:
2890 skb_trim(skb, b - skb->data);
2891 return -1;
2892}
2893
2894enum addr_type_t
2895{
2896 UNICAST_ADDR,
2897 MULTICAST_ADDR,
2898 ANYCAST_ADDR,
2899};
2900
2901static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2902 enum addr_type_t type)
2903{
2904 int idx, ip_idx;
2905 int s_idx, s_ip_idx;
2906 int err = 1;
2907 struct net_device *dev;
2908 struct inet6_dev *idev = NULL;
2909 struct inet6_ifaddr *ifa;
2910 struct ifmcaddr6 *ifmca;
2911 struct ifacaddr6 *ifaca;
2912
2913 s_idx = cb->args[0];
2914 s_ip_idx = ip_idx = cb->args[1];
2915 read_lock(&dev_base_lock);
2916
2917 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2918 if (idx < s_idx)
2919 continue;
2920 if (idx > s_idx)
2921 s_ip_idx = 0;
2922 ip_idx = 0;
2923 if ((idev = in6_dev_get(dev)) == NULL)
2924 continue;
2925 read_lock_bh(&idev->lock);
2926 switch (type) {
2927 case UNICAST_ADDR:
ae9cda5d 2928 /* unicast address incl. temp addr */
1da177e4
LT		 2929 for (ifa = idev->addr_list; ifa;
2930 ifa = ifa->if_next, ip_idx++) {
2931 if (ip_idx < s_ip_idx)
2932 continue;
2933 if ((err = inet6_fill_ifaddr(skb, ifa,
2934 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 2935 cb->nlh->nlmsg_seq, RTM_NEWADDR,
2936 NLM_F_MULTI)) <= 0)
1da177e4
LT		 2937 goto done;
2938 }
1da177e4
LT		 2939 break;
2940 case MULTICAST_ADDR:
2941 /* multicast address */
2942 for (ifmca = idev->mc_list; ifmca;
2943 ifmca = ifmca->next, ip_idx++) {
2944 if (ip_idx < s_ip_idx)
2945 continue;
2946 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
2947 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 2948 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
2949 NLM_F_MULTI)) <= 0)
1da177e4
LT		 2950 goto done;
2951 }
2952 break;
2953 case ANYCAST_ADDR:
2954 /* anycast address */
2955 for (ifaca = idev->ac_list; ifaca;
2956 ifaca = ifaca->aca_next, ip_idx++) {
2957 if (ip_idx < s_ip_idx)
2958 continue;
2959 if ((err = inet6_fill_ifacaddr(skb, ifaca,
2960 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 2961 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
2962 NLM_F_MULTI)) <= 0)
1da177e4
LT		 2963 goto done;
2964 }
2965 break;
2966 default:
2967 break;
2968 }
2969 read_unlock_bh(&idev->lock);
2970 in6_dev_put(idev);
2971 }
2972done:
2973 if (err <= 0) {
2974 read_unlock_bh(&idev->lock);
2975 in6_dev_put(idev);
2976 }
2977 read_unlock(&dev_base_lock);
2978 cb->args[0] = idx;
2979 cb->args[1] = ip_idx;
2980 return skb->len;
2981}
2982
2983static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
2984{
2985 enum addr_type_t type = UNICAST_ADDR;
2986 return inet6_dump_addr(skb, cb, type);
2987}
2988
2989static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
2990{
2991 enum addr_type_t type = MULTICAST_ADDR;
2992 return inet6_dump_addr(skb, cb, type);
2993}
2994
2995
2996static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
2997{
2998 enum addr_type_t type = ANYCAST_ADDR;
2999 return inet6_dump_addr(skb, cb, type);
3000}
3001
3002static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3003{
3004 struct sk_buff *skb;
3005 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3006
3007 skb = alloc_skb(size, GFP_ATOMIC);
3008 if (!skb) {
ac6d439d 3009 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
1da177e4
LT		 3010 return;
3011 }
9ed19f33 3012 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
1da177e4 3013 kfree_skb(skb);
ac6d439d 3014 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
1da177e4
LT		 3015 return;
3016 }
ac6d439d
PM		 3017 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3018 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
1da177e4
LT		 3019}
3020
3021static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3022 __s32 *array, int bytes)
3023{
3024 memset(array, 0, bytes);
3025 array[DEVCONF_FORWARDING] = cnf->forwarding;
3026 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3027 array[DEVCONF_MTU6] = cnf->mtu6;
3028 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3029 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3030 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3031 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3032 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3033 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3034 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3035 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3036#ifdef CONFIG_IPV6_PRIVACY
3037 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3038 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3039 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3040 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3041 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3042#endif
3043 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3044}
3045
3046static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3047 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 3048{
3049 struct net_device *dev = idev->dev;
3050 __s32 *array = NULL;
3051 struct ifinfomsg *r;
3052 struct nlmsghdr *nlh;
3053 unsigned char *b = skb->tail;
3054 struct rtattr *subattr;
3055 __u32 mtu = dev->mtu;
3056 struct ifla_cacheinfo ci;
3057
b6544c0b 3058 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
1da177e4
LT		 3059 r = NLMSG_DATA(nlh);
3060 r->ifi_family = AF_INET6;
9ef1d4c7 3061 r->__ifi_pad = 0;
1da177e4
LT		 3062 r->ifi_type = dev->type;
3063 r->ifi_index = dev->ifindex;
3064 r->ifi_flags = dev_get_flags(dev);
3065 r->ifi_change = 0;
3066
3067 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3068
3069 if (dev->addr_len)
3070 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3071
3072 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3073 if (dev->ifindex != dev->iflink)
3074 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3075
3076 subattr = (struct rtattr*)skb->tail;
3077
3078 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3079
3080 /* return the device flags */
3081 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3082
3083 /* return interface cacheinfo */
3084 ci.max_reasm_len = IPV6_MAXPLEN;
3085 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3086 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3087 ci.reachable_time = idev->nd_parms->reachable_time;
3088 ci.retrans_time = idev->nd_parms->retrans_time;
3089 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3090
3091 /* return the device sysctl params */
3092 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3093 goto rtattr_failure;
3094 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3095 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3096
3097 /* XXX - Statistics/MC not implemented */
3098 subattr->rta_len = skb->tail - (u8*)subattr;
3099
3100 nlh->nlmsg_len = skb->tail - b;
3101 kfree(array);
3102 return skb->len;
3103
3104nlmsg_failure:
3105rtattr_failure:
a51482bd 3106 kfree(array);
1da177e4
LT		 3107 skb_trim(skb, b - skb->data);
3108 return -1;
3109}
3110
3111static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3112{
3113 int idx, err;
3114 int s_idx = cb->args[0];
3115 struct net_device *dev;
3116 struct inet6_dev *idev;
3117
3118 read_lock(&dev_base_lock);
3119 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3120 if (idx < s_idx)
3121 continue;
3122 if ((idev = in6_dev_get(dev)) == NULL)
3123 continue;
3124 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3125 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3126 in6_dev_put(idev);
3127 if (err <= 0)
3128 break;
3129 }
3130 read_unlock(&dev_base_lock);
3131 cb->args[0] = idx;
3132
3133 return skb->len;
3134}
3135
3136void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3137{
3138 struct sk_buff *skb;
3139 /* 128 bytes ?? */
3140 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3141
3142 skb = alloc_skb(size, GFP_ATOMIC);
3143 if (!skb) {
ac6d439d 3144 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
1da177e4
LT		 3145 return;
3146 }
9ed19f33 3147 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
1da177e4 3148 kfree_skb(skb);
ac6d439d 3149 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
1da177e4
LT		 3150 return;
3151 }
ac6d439d
PM		 3152 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3153 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
1da177e4
LT		 3154}
3155
3156static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b
JHS		 3157 struct prefix_info *pinfo, u32 pid, u32 seq,
3158 int event, unsigned int flags)
1da177e4
LT		 3159{
3160 struct prefixmsg *pmsg;
3161 struct nlmsghdr *nlh;
3162 unsigned char *b = skb->tail;
3163 struct prefix_cacheinfo ci;
3164
b6544c0b 3165 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
1da177e4
LT		 3166 pmsg = NLMSG_DATA(nlh);
3167 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3168 pmsg->prefix_pad1 = 0;
3169 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3170 pmsg->prefix_ifindex = idev->dev->ifindex;
3171 pmsg->prefix_len = pinfo->prefix_len;
3172 pmsg->prefix_type = pinfo->type;
8a47077a 3173 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3174
3175 pmsg->prefix_flags = 0;
3176 if (pinfo->onlink)
3177 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3178 if (pinfo->autoconf)
3179 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3180
3181 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3182
3183 ci.preferred_time = ntohl(pinfo->prefered);
3184 ci.valid_time = ntohl(pinfo->valid);
3185 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3186
3187 nlh->nlmsg_len = skb->tail - b;
3188 return skb->len;
3189
3190nlmsg_failure:
3191rtattr_failure:
3192 skb_trim(skb, b - skb->data);
3193 return -1;
3194}
3195
3196static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3197 struct prefix_info *pinfo)
3198{
3199 struct sk_buff *skb;
3200 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3201
3202 skb = alloc_skb(size, GFP_ATOMIC);
3203 if (!skb) {
ac6d439d 3204 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
1da177e4
LT		 3205 return;
3206 }
9ed19f33 3207 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
1da177e4 3208 kfree_skb(skb);
ac6d439d 3209 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
1da177e4
LT		 3210 return;
3211 }
ac6d439d
PM		 3212 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3213 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
1da177e4
LT		 3214}
3215
db46edc6 3216static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
1da177e4
LT		 3217 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3218 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3219 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3220 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3221 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3222 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3223 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3224 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3225 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3226 .dumpit = inet6_dump_fib, },
3227};
3228
3229static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3230{
3231 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3232
3233 switch (event) {
3234 case RTM_NEWADDR:
3235 dst_hold(&ifp->rt->u.dst);
0d51aa80 3236 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
1da177e4
LT		 3237 dst_release(&ifp->rt->u.dst);
3238 if (ifp->idev->cnf.forwarding)
3239 addrconf_join_anycast(ifp);
3240 break;
3241 case RTM_DELADDR:
3242 if (ifp->idev->cnf.forwarding)
3243 addrconf_leave_anycast(ifp);
3244 addrconf_leave_solict(ifp->idev, &ifp->addr);
3245 dst_hold(&ifp->rt->u.dst);
0d51aa80 3246 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
1da177e4
LT		 3247 dst_free(&ifp->rt->u.dst);
3248 else
3249 dst_release(&ifp->rt->u.dst);
3250 break;
3251 }
3252}
3253
3254static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3255{
3256 read_lock_bh(&addrconf_lock);
3257 if (likely(ifp->idev->dead == 0))
3258 __ipv6_ifa_notify(event, ifp);
3259 read_unlock_bh(&addrconf_lock);
3260}
3261
3262#ifdef CONFIG_SYSCTL
3263
3264static
3265int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3266 void __user *buffer, size_t *lenp, loff_t *ppos)
3267{
3268 int *valp = ctl->data;
3269 int val = *valp;
3270 int ret;
3271
3272 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3273
3274 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3275 if (valp != &ipv6_devconf.forwarding) {
3276 if ((!*valp) ^ (!val)) {
3277 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3278 if (idev == NULL)
3279 return ret;
3280 dev_forward_change(idev);
3281 }
3282 } else {
3283 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3284 addrconf_forward_change();
3285 }
3286 if (*valp)
3287 rt6_purge_dflt_routers();
3288 }
3289
3290 return ret;
3291}
3292
3293static int addrconf_sysctl_forward_strategy(ctl_table *table,
3294 int __user *name, int nlen,
3295 void __user *oldval,
3296 size_t __user *oldlenp,
3297 void __user *newval, size_t newlen,
3298 void **context)
3299{
3300 int *valp = table->data;
3301 int new;
3302
3303 if (!newval || !newlen)
3304 return 0;
3305 if (newlen != sizeof(int))
3306 return -EINVAL;
3307 if (get_user(new, (int __user *)newval))
3308 return -EFAULT;
3309 if (new == *valp)
3310 return 0;
3311 if (oldval && oldlenp) {
3312 size_t len;
3313 if (get_user(len, oldlenp))
3314 return -EFAULT;
3315 if (len) {
3316 if (len > table->maxlen)
3317 len = table->maxlen;
3318 if (copy_to_user(oldval, valp, len))
3319 return -EFAULT;
3320 if (put_user(len, oldlenp))
3321 return -EFAULT;
3322 }
3323 }
3324
3325 if (valp != &ipv6_devconf_dflt.forwarding) {
3326 if (valp != &ipv6_devconf.forwarding) {
3327 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3328 int changed;
3329 if (unlikely(idev == NULL))
3330 return -ENODEV;
3331 changed = (!*valp) ^ (!new);
3332 *valp = new;
3333 if (changed)
3334 dev_forward_change(idev);
3335 } else {
3336 *valp = new;
3337 addrconf_forward_change();
3338 }
3339
3340 if (*valp)
3341 rt6_purge_dflt_routers();
3342 } else
3343 *valp = new;
3344
3345 return 1;
3346}
3347
3348static struct addrconf_sysctl_table
3349{
3350 struct ctl_table_header *sysctl_header;
3351 ctl_table addrconf_vars[__NET_IPV6_MAX];
3352 ctl_table addrconf_dev[2];
3353 ctl_table addrconf_conf_dir[2];
3354 ctl_table addrconf_proto_dir[2];
3355 ctl_table addrconf_root_dir[2];
3356} addrconf_sysctl = {
3357 .sysctl_header = NULL,
3358 .addrconf_vars = {
3359 {
3360 .ctl_name = NET_IPV6_FORWARDING,
3361 .procname = "forwarding",
3362 .data = &ipv6_devconf.forwarding,
3363 .maxlen = sizeof(int),
3364 .mode = 0644,
3365 .proc_handler = &addrconf_sysctl_forward,
3366 .strategy = &addrconf_sysctl_forward_strategy,
3367 },
3368 {
3369 .ctl_name = NET_IPV6_HOP_LIMIT,
3370 .procname = "hop_limit",
3371 .data = &ipv6_devconf.hop_limit,
3372 .maxlen = sizeof(int),
3373 .mode = 0644,
3374 .proc_handler = proc_dointvec,
3375 },
3376 {
3377 .ctl_name = NET_IPV6_MTU,
3378 .procname = "mtu",
3379 .data = &ipv6_devconf.mtu6,
3380 .maxlen = sizeof(int),
3381 .mode = 0644,
3382 .proc_handler = &proc_dointvec,
3383 },
3384 {
3385 .ctl_name = NET_IPV6_ACCEPT_RA,
3386 .procname = "accept_ra",
3387 .data = &ipv6_devconf.accept_ra,
3388 .maxlen = sizeof(int),
3389 .mode = 0644,
3390 .proc_handler = &proc_dointvec,
3391 },
3392 {
3393 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3394 .procname = "accept_redirects",
3395 .data = &ipv6_devconf.accept_redirects,
3396 .maxlen = sizeof(int),
3397 .mode = 0644,
3398 .proc_handler = &proc_dointvec,
3399 },
3400 {
3401 .ctl_name = NET_IPV6_AUTOCONF,
3402 .procname = "autoconf",
3403 .data = &ipv6_devconf.autoconf,
3404 .maxlen = sizeof(int),
3405 .mode = 0644,
3406 .proc_handler = &proc_dointvec,
3407 },
3408 {
3409 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3410 .procname = "dad_transmits",
3411 .data = &ipv6_devconf.dad_transmits,
3412 .maxlen = sizeof(int),
3413 .mode = 0644,
3414 .proc_handler = &proc_dointvec,
3415 },
3416 {
3417 .ctl_name = NET_IPV6_RTR_SOLICITS,
3418 .procname = "router_solicitations",
3419 .data = &ipv6_devconf.rtr_solicits,
3420 .maxlen = sizeof(int),
3421 .mode = 0644,
3422 .proc_handler = &proc_dointvec,
3423 },
3424 {
3425 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3426 .procname = "router_solicitation_interval",
3427 .data = &ipv6_devconf.rtr_solicit_interval,
3428 .maxlen = sizeof(int),
3429 .mode = 0644,
3430 .proc_handler = &proc_dointvec_jiffies,
3431 .strategy = &sysctl_jiffies,
3432 },
3433 {
3434 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3435 .procname = "router_solicitation_delay",
3436 .data = &ipv6_devconf.rtr_solicit_delay,
3437 .maxlen = sizeof(int),
3438 .mode = 0644,
3439 .proc_handler = &proc_dointvec_jiffies,
3440 .strategy = &sysctl_jiffies,
3441 },
3442 {
3443 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3444 .procname = "force_mld_version",
3445 .data = &ipv6_devconf.force_mld_version,
3446 .maxlen = sizeof(int),
3447 .mode = 0644,
3448 .proc_handler = &proc_dointvec,
3449 },
3450#ifdef CONFIG_IPV6_PRIVACY
3451 {
3452 .ctl_name = NET_IPV6_USE_TEMPADDR,
3453 .procname = "use_tempaddr",
3454 .data = &ipv6_devconf.use_tempaddr,
3455 .maxlen = sizeof(int),
3456 .mode = 0644,
3457 .proc_handler = &proc_dointvec,
3458 },
3459 {
3460 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3461 .procname = "temp_valid_lft",
3462 .data = &ipv6_devconf.temp_valid_lft,
3463 .maxlen = sizeof(int),
3464 .mode = 0644,
3465 .proc_handler = &proc_dointvec,
3466 },
3467 {
3468 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3469 .procname = "temp_prefered_lft",
3470 .data = &ipv6_devconf.temp_prefered_lft,
3471 .maxlen = sizeof(int),
3472 .mode = 0644,
3473 .proc_handler = &proc_dointvec,
3474 },
3475 {
3476 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3477 .procname = "regen_max_retry",
3478 .data = &ipv6_devconf.regen_max_retry,
3479 .maxlen = sizeof(int),
3480 .mode = 0644,
3481 .proc_handler = &proc_dointvec,
3482 },
3483 {
3484 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3485 .procname = "max_desync_factor",
3486 .data = &ipv6_devconf.max_desync_factor,
3487 .maxlen = sizeof(int),
3488 .mode = 0644,
3489 .proc_handler = &proc_dointvec,
3490 },
3491#endif
3492 {
3493 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3494 .procname = "max_addresses",
3495 .data = &ipv6_devconf.max_addresses,
3496 .maxlen = sizeof(int),
3497 .mode = 0644,
3498 .proc_handler = &proc_dointvec,
3499 },
3500 {
3501 .ctl_name = 0, /* sentinel */
3502 }
3503 },
3504 .addrconf_dev = {
3505 {
3506 .ctl_name = NET_PROTO_CONF_ALL,
3507 .procname = "all",
3508 .mode = 0555,
3509 .child = addrconf_sysctl.addrconf_vars,
3510 },
3511 {
3512 .ctl_name = 0, /* sentinel */
3513 }
3514 },
3515 .addrconf_conf_dir = {
3516 {
3517 .ctl_name = NET_IPV6_CONF,
3518 .procname = "conf",
3519 .mode = 0555,
3520 .child = addrconf_sysctl.addrconf_dev,
3521 },
3522 {
3523 .ctl_name = 0, /* sentinel */
3524 }
3525 },
3526 .addrconf_proto_dir = {
3527 {
3528 .ctl_name = NET_IPV6,
3529 .procname = "ipv6",
3530 .mode = 0555,
3531 .child = addrconf_sysctl.addrconf_conf_dir,
3532 },
3533 {
3534 .ctl_name = 0, /* sentinel */
3535 }
3536 },
3537 .addrconf_root_dir = {
3538 {
3539 .ctl_name = CTL_NET,
3540 .procname = "net",
3541 .mode = 0555,
3542 .child = addrconf_sysctl.addrconf_proto_dir,
3543 },
3544 {
3545 .ctl_name = 0, /* sentinel */
3546 }
3547 },
3548};
3549
3550static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3551{
3552 int i;
3553 struct net_device *dev = idev ? idev->dev : NULL;
3554 struct addrconf_sysctl_table *t;
3555 char *dev_name = NULL;
3556
3557 t = kmalloc(sizeof(*t), GFP_KERNEL);
3558 if (t == NULL)
3559 return;
3560 memcpy(t, &addrconf_sysctl, sizeof(*t));
3561 for (i=0; t->addrconf_vars[i].data; i++) {
3562 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3563 t->addrconf_vars[i].de = NULL;
3564 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3565 }
3566 if (dev) {
3567 dev_name = dev->name;
3568 t->addrconf_dev[0].ctl_name = dev->ifindex;
3569 } else {
3570 dev_name = "default";
3571 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3572 }
3573
3574 /*
3575 * Make a copy of dev_name, because '.procname' is regarded as const
3576 * by sysctl and we wouldn't want anyone to change it under our feet
3577 * (see SIOCSIFNAME).
3578 */
543537bd 3579 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 3580 if (!dev_name)
3581 goto free;
3582
3583 t->addrconf_dev[0].procname = dev_name;
3584
3585 t->addrconf_dev[0].child = t->addrconf_vars;
3586 t->addrconf_dev[0].de = NULL;
3587 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3588 t->addrconf_conf_dir[0].de = NULL;
3589 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3590 t->addrconf_proto_dir[0].de = NULL;
3591 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3592 t->addrconf_root_dir[0].de = NULL;
3593
3594 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3595 if (t->sysctl_header == NULL)
3596 goto free_procname;
3597 else
3598 p->sysctl = t;
3599 return;
3600
3601 /* error path */
3602 free_procname:
3603 kfree(dev_name);
3604 free:
3605 kfree(t);
3606
3607 return;
3608}
3609
3610static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3611{
3612 if (p->sysctl) {
3613 struct addrconf_sysctl_table *t = p->sysctl;
3614 p->sysctl = NULL;
3615 unregister_sysctl_table(t->sysctl_header);
3616 kfree(t->addrconf_dev[0].procname);
3617 kfree(t);
3618 }
3619}
3620
3621
3622#endif
3623
3624/*
3625 * Device notifier
3626 */
3627
3628int register_inet6addr_notifier(struct notifier_block *nb)
3629{
3630 return notifier_chain_register(&inet6addr_chain, nb);
3631}
3632
3633int unregister_inet6addr_notifier(struct notifier_block *nb)
3634{
3635 return notifier_chain_unregister(&inet6addr_chain,nb);
3636}
3637
3638/*
3639 * Init / cleanup code
3640 */
3641
3642int __init addrconf_init(void)
3643{
3644 int err = 0;
3645
3646 /* The addrconf netdev notifier requires that loopback_dev
3647 * has it's ipv6 private information allocated and setup
3648 * before it can bring up and give link-local addresses
3649 * to other devices which are up.
3650 *
3651 * Unfortunately, loopback_dev is not necessarily the first
3652 * entry in the global dev_base list of net devices. In fact,
3653 * it is likely to be the very last entry on that list.
3654 * So this causes the notifier registry below to try and
3655 * give link-local addresses to all devices besides loopback_dev
3656 * first, then loopback_dev, which cases all the non-loopback_dev
3657 * devices to fail to get a link-local address.
3658 *
3659 * So, as a temporary fix, allocate the ipv6 structure for
3660 * loopback_dev first by hand.
3661 * Longer term, all of the dependencies ipv6 has upon the loopback
3662 * device and it being up should be removed.
3663 */
3664 rtnl_lock();
3665 if (!ipv6_add_dev(&loopback_dev))
3666 err = -ENOMEM;
3667 rtnl_unlock();
3668 if (err)
3669 return err;
3670
c62dba90
HX		 3671 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3672
1da177e4
LT		 3673 register_netdevice_notifier(&ipv6_dev_notf);
3674
3675#ifdef CONFIG_IPV6_PRIVACY
3676 md5_tfm = crypto_alloc_tfm("md5", 0);
3677 if (unlikely(md5_tfm == NULL))
3678 printk(KERN_WARNING
3679 "failed to load transform for md5\n");
3680#endif
3681
3682 addrconf_verify(0);
3683 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3684#ifdef CONFIG_SYSCTL
3685 addrconf_sysctl.sysctl_header =
3686 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3687 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3688#endif
3689
3690 return 0;
3691}
3692
3693void __exit addrconf_cleanup(void)
3694{
3695 struct net_device *dev;
3696 struct inet6_dev *idev;
3697 struct inet6_ifaddr *ifa;
3698 int i;
3699
3700 unregister_netdevice_notifier(&ipv6_dev_notf);
3701
3702 rtnetlink_links[PF_INET6] = NULL;
3703#ifdef CONFIG_SYSCTL
3704 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3705 addrconf_sysctl_unregister(&ipv6_devconf);
3706#endif
3707
3708 rtnl_lock();
3709
3710 /*
3711 * clean dev list.
3712 */
3713
3714 for (dev=dev_base; dev; dev=dev->next) {
3715 if ((idev = __in6_dev_get(dev)) == NULL)
3716 continue;
3717 addrconf_ifdown(dev, 1);
3718 }
3719 addrconf_ifdown(&loopback_dev, 2);
3720
3721 /*
3722 * Check hash table.
3723 */
3724
3725 write_lock_bh(&addrconf_hash_lock);
3726 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3727 for (ifa=inet6_addr_lst[i]; ifa; ) {
3728 struct inet6_ifaddr *bifa;
3729
3730 bifa = ifa;
3731 ifa = ifa->lst_next;
3732 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3733 /* Do not free it; something is wrong.
3734 Now we can investigate it with debugger.
3735 */
3736 }
3737 }
3738 write_unlock_bh(&addrconf_hash_lock);
3739
3740 del_timer(&addr_chk_timer);
3741
3742 rtnl_unlock();
3743
3744#ifdef CONFIG_IPV6_PRIVACY
573dbd95
JJ		 3745 crypto_free_tfm(md5_tfm);
3746 md5_tfm = NULL;
1da177e4
LT		 3747#endif
3748
3749#ifdef CONFIG_PROC_FS
3750 proc_net_remove("if_inet6");
3751#endif
3752}
Clone of davem's net-next-2.6 tree