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[IPV6]: Run DAD when the link becomes ready.
[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);
c5e33bdd 140static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 141static void addrconf_rs_timer(unsigned long data);
142static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
143static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
144
145static void inet6_prefix_notify(int event, struct inet6_dev *idev,
146 struct prefix_info *pinfo);
147static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
148
149static struct notifier_block *inet6addr_chain;
150
151struct ipv6_devconf ipv6_devconf = {
152 .forwarding = 0,
153 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
154 .mtu6 = IPV6_MIN_MTU,
155 .accept_ra = 1,
156 .accept_redirects = 1,
157 .autoconf = 1,
158 .force_mld_version = 0,
159 .dad_transmits = 1,
160 .rtr_solicits = MAX_RTR_SOLICITATIONS,
161 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
162 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
163#ifdef CONFIG_IPV6_PRIVACY
164 .use_tempaddr = 0,
165 .temp_valid_lft = TEMP_VALID_LIFETIME,
166 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
167 .regen_max_retry = REGEN_MAX_RETRY,
168 .max_desync_factor = MAX_DESYNC_FACTOR,
169#endif
170 .max_addresses = IPV6_MAX_ADDRESSES,
171};
172
173static struct ipv6_devconf ipv6_devconf_dflt = {
174 .forwarding = 0,
175 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
176 .mtu6 = IPV6_MIN_MTU,
177 .accept_ra = 1,
178 .accept_redirects = 1,
179 .autoconf = 1,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184#ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190#endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
192};
193
194/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
195#if 0
196const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
197#endif
198const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
199
b1cacb68
YH		 200#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
201
202static inline unsigned ipv6_addr_scope2type(unsigned scope)
203{
204 switch(scope) {
205 case IPV6_ADDR_SCOPE_NODELOCAL:
206 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
207 IPV6_ADDR_LOOPBACK);
208 case IPV6_ADDR_SCOPE_LINKLOCAL:
209 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
210 IPV6_ADDR_LINKLOCAL);
211 case IPV6_ADDR_SCOPE_SITELOCAL:
212 return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
213 IPV6_ADDR_SITELOCAL);
214 }
215 return IPV6_ADDR_SCOPE_TYPE(scope);
216}
217
218int __ipv6_addr_type(const struct in6_addr *addr)
1da177e4 219{
1da177e4
LT		 220 u32 st;
221
222 st = addr->s6_addr32[0];
223
1da177e4 224 /* Consider all addresses with the first three bits different of
b1cacb68 225 000 and 111 as unicasts.
1da177e4
LT		 226 */
227 if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
228 (st & htonl(0xE0000000)) != htonl(0xE0000000))
b1cacb68
YH		 229 return (IPV6_ADDR_UNICAST |
230 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
1da177e4 231
b1cacb68
YH		 232 if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
233 /* multicast */
234 /* addr-select 3.1 */
235 return (IPV6_ADDR_MULTICAST |
236 ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
237 }
238
239 if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
240 return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
241 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
1da177e4 242 if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
b1cacb68
YH		 243 return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
244 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
1da177e4
LT		 245
246 if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
247 if (addr->s6_addr32[2] == 0) {
248 if (addr->s6_addr32[3] == 0)
249 return IPV6_ADDR_ANY;
250
251 if (addr->s6_addr32[3] == htonl(0x00000001))
b1cacb68
YH		 252 return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
253 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
1da177e4 254
b1cacb68
YH		 255 return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
256 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
1da177e4
LT		 257 }
258
259 if (addr->s6_addr32[2] == htonl(0x0000ffff))
b1cacb68
YH		 260 return (IPV6_ADDR_MAPPED |
261 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
1da177e4
LT		 262 }
263
b1cacb68
YH		 264 return (IPV6_ADDR_RESERVED |
265 IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
1da177e4
LT		 266}
267
268static void addrconf_del_timer(struct inet6_ifaddr *ifp)
269{
270 if (del_timer(&ifp->timer))
271 __in6_ifa_put(ifp);
272}
273
274enum addrconf_timer_t
275{
276 AC_NONE,
277 AC_DAD,
278 AC_RS,
279};
280
281static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
282 enum addrconf_timer_t what,
283 unsigned long when)
284{
285 if (!del_timer(&ifp->timer))
286 in6_ifa_hold(ifp);
287
288 switch (what) {
289 case AC_DAD:
290 ifp->timer.function = addrconf_dad_timer;
291 break;
292 case AC_RS:
293 ifp->timer.function = addrconf_rs_timer;
294 break;
295 default:;
296 }
297 ifp->timer.expires = jiffies + when;
298 add_timer(&ifp->timer);
299}
300
301/* Nobody refers to this device, we may destroy it. */
302
303void in6_dev_finish_destroy(struct inet6_dev *idev)
304{
305 struct net_device *dev = idev->dev;
306 BUG_TRAP(idev->addr_list==NULL);
307 BUG_TRAP(idev->mc_list==NULL);
308#ifdef NET_REFCNT_DEBUG
309 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
310#endif
311 dev_put(dev);
312 if (!idev->dead) {
313 printk("Freeing alive inet6 device %p\n", idev);
314 return;
315 }
316 snmp6_free_dev(idev);
317 kfree(idev);
318}
319
320static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
321{
322 struct inet6_dev *ndev;
323
324 ASSERT_RTNL();
325
326 if (dev->mtu < IPV6_MIN_MTU)
327 return NULL;
328
329 ndev = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
330
331 if (ndev) {
332 memset(ndev, 0, sizeof(struct inet6_dev));
333
334 rwlock_init(&ndev->lock);
335 ndev->dev = dev;
336 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
337 ndev->cnf.mtu6 = dev->mtu;
338 ndev->cnf.sysctl = NULL;
339 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
340 if (ndev->nd_parms == NULL) {
341 kfree(ndev);
342 return NULL;
343 }
344 /* We refer to the device */
345 dev_hold(dev);
346
347 if (snmp6_alloc_dev(ndev) < 0) {
348 ADBG((KERN_WARNING
349 "%s(): cannot allocate memory for statistics; dev=%s.\n",
350 __FUNCTION__, dev->name));
351 neigh_parms_release(&nd_tbl, ndev->nd_parms);
352 ndev->dead = 1;
353 in6_dev_finish_destroy(ndev);
354 return NULL;
355 }
356
357 if (snmp6_register_dev(ndev) < 0) {
358 ADBG((KERN_WARNING
359 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
360 __FUNCTION__, dev->name));
361 neigh_parms_release(&nd_tbl, ndev->nd_parms);
362 ndev->dead = 1;
363 in6_dev_finish_destroy(ndev);
364 return NULL;
365 }
366
367 /* One reference from device. We must do this before
368 * we invoke __ipv6_regen_rndid().
369 */
370 in6_dev_hold(ndev);
371
372#ifdef CONFIG_IPV6_PRIVACY
373 get_random_bytes(ndev->rndid, sizeof(ndev->rndid));
374 get_random_bytes(ndev->entropy, sizeof(ndev->entropy));
375 init_timer(&ndev->regen_timer);
376 ndev->regen_timer.function = ipv6_regen_rndid;
377 ndev->regen_timer.data = (unsigned long) ndev;
378 if ((dev->flags&IFF_LOOPBACK) ||
379 dev->type == ARPHRD_TUNNEL ||
77bd9196 380 dev->type == ARPHRD_NONE ||
1da177e4
LT		 381 dev->type == ARPHRD_SIT) {
382 printk(KERN_INFO
a1493d9c
DM		 383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
1da177e4
LT		 385 ndev->cnf.use_tempaddr = -1;
386 } else {
387 in6_dev_hold(ndev);
388 ipv6_regen_rndid((unsigned long) ndev);
389 }
390#endif
391
3c21edbd
YH		 392 if (netif_carrier_ok(dev))
393 ndev->if_flags |= IF_READY;
394
1da177e4
LT		 395 write_lock_bh(&addrconf_lock);
396 dev->ip6_ptr = ndev;
397 write_unlock_bh(&addrconf_lock);
398
399 ipv6_mc_init_dev(ndev);
400 ndev->tstamp = jiffies;
401#ifdef CONFIG_SYSCTL
402 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
403 NET_IPV6_NEIGH, "ipv6",
404 &ndisc_ifinfo_sysctl_change,
405 NULL);
406 addrconf_sysctl_register(ndev, &ndev->cnf);
407#endif
408 }
409 return ndev;
410}
411
412static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
413{
414 struct inet6_dev *idev;
415
416 ASSERT_RTNL();
417
418 if ((idev = __in6_dev_get(dev)) == NULL) {
419 if ((idev = ipv6_add_dev(dev)) == NULL)
420 return NULL;
421 }
c5e33bdd 422
1da177e4
LT		 423 if (dev->flags&IFF_UP)
424 ipv6_mc_up(idev);
425 return idev;
426}
427
428#ifdef CONFIG_SYSCTL
429static void dev_forward_change(struct inet6_dev *idev)
430{
431 struct net_device *dev;
432 struct inet6_ifaddr *ifa;
433 struct in6_addr addr;
434
435 if (!idev)
436 return;
437 dev = idev->dev;
438 if (dev && (dev->flags & IFF_MULTICAST)) {
439 ipv6_addr_all_routers(&addr);
440
441 if (idev->cnf.forwarding)
442 ipv6_dev_mc_inc(dev, &addr);
443 else
444 ipv6_dev_mc_dec(dev, &addr);
445 }
446 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
447 if (idev->cnf.forwarding)
448 addrconf_join_anycast(ifa);
449 else
450 addrconf_leave_anycast(ifa);
451 }
452}
453
454
455static void addrconf_forward_change(void)
456{
457 struct net_device *dev;
458 struct inet6_dev *idev;
459
460 read_lock(&dev_base_lock);
461 for (dev=dev_base; dev; dev=dev->next) {
462 read_lock(&addrconf_lock);
463 idev = __in6_dev_get(dev);
464 if (idev) {
465 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
466 idev->cnf.forwarding = ipv6_devconf.forwarding;
467 if (changed)
468 dev_forward_change(idev);
469 }
470 read_unlock(&addrconf_lock);
471 }
472 read_unlock(&dev_base_lock);
473}
474#endif
475
476/* Nobody refers to this ifaddr, destroy it */
477
478void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
479{
480 BUG_TRAP(ifp->if_next==NULL);
481 BUG_TRAP(ifp->lst_next==NULL);
482#ifdef NET_REFCNT_DEBUG
483 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
484#endif
485
486 in6_dev_put(ifp->idev);
487
488 if (del_timer(&ifp->timer))
489 printk("Timer is still running, when freeing ifa=%p\n", ifp);
490
491 if (!ifp->dead) {
492 printk("Freeing alive inet6 address %p\n", ifp);
493 return;
494 }
495 dst_release(&ifp->rt->u.dst);
496
497 kfree(ifp);
498}
499
500/* On success it returns ifp with increased reference count */
501
502static struct inet6_ifaddr *
503ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 504 int scope, u32 flags)
1da177e4
LT		 505{
506 struct inet6_ifaddr *ifa = NULL;
507 struct rt6_info *rt;
508 int hash;
509 int err = 0;
510
511 read_lock_bh(&addrconf_lock);
512 if (idev->dead) {
513 err = -ENODEV; /*XXX*/
514 goto out2;
515 }
516
517 write_lock(&addrconf_hash_lock);
518
519 /* Ignore adding duplicate addresses on an interface */
520 if (ipv6_chk_same_addr(addr, idev->dev)) {
521 ADBG(("ipv6_add_addr: already assigned\n"));
522 err = -EEXIST;
523 goto out;
524 }
525
526 ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
527
528 if (ifa == NULL) {
529 ADBG(("ipv6_add_addr: malloc failed\n"));
530 err = -ENOBUFS;
531 goto out;
532 }
533
534 rt = addrconf_dst_alloc(idev, addr, 0);
535 if (IS_ERR(rt)) {
536 err = PTR_ERR(rt);
537 goto out;
538 }
539
540 memset(ifa, 0, sizeof(struct inet6_ifaddr));
541 ipv6_addr_copy(&ifa->addr, addr);
542
543 spin_lock_init(&ifa->lock);
544 init_timer(&ifa->timer);
545 ifa->timer.data = (unsigned long) ifa;
546 ifa->scope = scope;
547 ifa->prefix_len = pfxlen;
548 ifa->flags = flags | IFA_F_TENTATIVE;
549 ifa->cstamp = ifa->tstamp = jiffies;
550
551 ifa->idev = idev;
552 in6_dev_hold(idev);
553 /* For caller */
554 in6_ifa_hold(ifa);
555
556 /* Add to big hash table */
557 hash = ipv6_addr_hash(addr);
558
559 ifa->lst_next = inet6_addr_lst[hash];
560 inet6_addr_lst[hash] = ifa;
561 in6_ifa_hold(ifa);
562 write_unlock(&addrconf_hash_lock);
563
564 write_lock(&idev->lock);
565 /* Add to inet6_dev unicast addr list. */
566 ifa->if_next = idev->addr_list;
567 idev->addr_list = ifa;
568
569#ifdef CONFIG_IPV6_PRIVACY
570 if (ifa->flags&IFA_F_TEMPORARY) {
571 ifa->tmp_next = idev->tempaddr_list;
572 idev->tempaddr_list = ifa;
573 in6_ifa_hold(ifa);
574 }
575#endif
576
577 ifa->rt = rt;
578
579 in6_ifa_hold(ifa);
580 write_unlock(&idev->lock);
581out2:
582 read_unlock_bh(&addrconf_lock);
583
fd92833a 584 if (likely(err == 0))
1da177e4
LT		 585 notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
586 else {
587 kfree(ifa);
588 ifa = ERR_PTR(err);
589 }
590
591 return ifa;
592out:
593 write_unlock(&addrconf_hash_lock);
594 goto out2;
595}
596
597/* This function wants to get referenced ifp and releases it before return */
598
599static void ipv6_del_addr(struct inet6_ifaddr *ifp)
600{
601 struct inet6_ifaddr *ifa, **ifap;
602 struct inet6_dev *idev = ifp->idev;
603 int hash;
604 int deleted = 0, onlink = 0;
605 unsigned long expires = jiffies;
606
607 hash = ipv6_addr_hash(&ifp->addr);
608
609 ifp->dead = 1;
610
611 write_lock_bh(&addrconf_hash_lock);
612 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
613 ifap = &ifa->lst_next) {
614 if (ifa == ifp) {
615 *ifap = ifa->lst_next;
616 __in6_ifa_put(ifp);
617 ifa->lst_next = NULL;
618 break;
619 }
620 }
621 write_unlock_bh(&addrconf_hash_lock);
622
623 write_lock_bh(&idev->lock);
624#ifdef CONFIG_IPV6_PRIVACY
625 if (ifp->flags&IFA_F_TEMPORARY) {
626 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
627 ifap = &ifa->tmp_next) {
628 if (ifa == ifp) {
629 *ifap = ifa->tmp_next;
630 if (ifp->ifpub) {
631 in6_ifa_put(ifp->ifpub);
632 ifp->ifpub = NULL;
633 }
634 __in6_ifa_put(ifp);
635 ifa->tmp_next = NULL;
636 break;
637 }
638 }
639 }
640#endif
641
642 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
643 ifap = &ifa->if_next) {
644 if (ifa == ifp) {
645 *ifap = ifa->if_next;
646 __in6_ifa_put(ifp);
647 ifa->if_next = NULL;
648 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
649 break;
650 deleted = 1;
651 } else if (ifp->flags & IFA_F_PERMANENT) {
652 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
653 ifp->prefix_len)) {
654 if (ifa->flags & IFA_F_PERMANENT) {
655 onlink = 1;
656 if (deleted)
657 break;
658 } else {
659 unsigned long lifetime;
660
661 if (!onlink)
662 onlink = -1;
663
664 spin_lock(&ifa->lock);
665 lifetime = min_t(unsigned long,
666 ifa->valid_lft, 0x7fffffffUL/HZ);
667 if (time_before(expires,
668 ifa->tstamp + lifetime * HZ))
669 expires = ifa->tstamp + lifetime * HZ;
670 spin_unlock(&ifa->lock);
671 }
672 }
673 }
674 }
675 write_unlock_bh(&idev->lock);
676
677 ipv6_ifa_notify(RTM_DELADDR, ifp);
678
679 notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
680
681 addrconf_del_timer(ifp);
682
683 /*
684 * Purge or update corresponding prefix
685 *
686 * 1) we don't purge prefix here if address was not permanent.
687 * prefix is managed by its own lifetime.
688 * 2) if there're no addresses, delete prefix.
689 * 3) if there're still other permanent address(es),
690 * corresponding prefix is still permanent.
691 * 4) otherwise, update prefix lifetime to the
692 * longest valid lifetime among the corresponding
693 * addresses on the device.
694 * Note: subsequent RA will update lifetime.
695 *
696 * --yoshfuji
697 */
698 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
699 struct in6_addr prefix;
700 struct rt6_info *rt;
701
702 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
703 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
704
705 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
706 if (onlink == 0) {
0d51aa80 707 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 708 rt = NULL;
709 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
710 rt->rt6i_expires = expires;
711 rt->rt6i_flags |= RTF_EXPIRES;
712 }
713 }
714 dst_release(&rt->u.dst);
715 }
716
717 in6_ifa_put(ifp);
718}
719
720#ifdef CONFIG_IPV6_PRIVACY
721static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
722{
723 struct inet6_dev *idev = ifp->idev;
724 struct in6_addr addr, *tmpaddr;
725 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
726 int tmp_plen;
727 int ret = 0;
728 int max_addresses;
729
730 write_lock(&idev->lock);
731 if (ift) {
732 spin_lock_bh(&ift->lock);
733 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
734 spin_unlock_bh(&ift->lock);
735 tmpaddr = &addr;
736 } else {
737 tmpaddr = NULL;
738 }
739retry:
740 in6_dev_hold(idev);
741 if (idev->cnf.use_tempaddr <= 0) {
742 write_unlock(&idev->lock);
743 printk(KERN_INFO
744 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
745 in6_dev_put(idev);
746 ret = -1;
747 goto out;
748 }
749 spin_lock_bh(&ifp->lock);
750 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
751 idev->cnf.use_tempaddr = -1; /*XXX*/
752 spin_unlock_bh(&ifp->lock);
753 write_unlock(&idev->lock);
754 printk(KERN_WARNING
755 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
756 in6_dev_put(idev);
757 ret = -1;
758 goto out;
759 }
760 in6_ifa_hold(ifp);
761 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
762 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
763 spin_unlock_bh(&ifp->lock);
764 write_unlock(&idev->lock);
765 printk(KERN_WARNING
766 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
767 in6_ifa_put(ifp);
768 in6_dev_put(idev);
769 ret = -1;
770 goto out;
771 }
772 memcpy(&addr.s6_addr[8], idev->rndid, 8);
773 tmp_valid_lft = min_t(__u32,
774 ifp->valid_lft,
775 idev->cnf.temp_valid_lft);
776 tmp_prefered_lft = min_t(__u32,
777 ifp->prefered_lft,
778 idev->cnf.temp_prefered_lft - desync_factor / HZ);
779 tmp_plen = ifp->prefix_len;
780 max_addresses = idev->cnf.max_addresses;
781 tmp_cstamp = ifp->cstamp;
782 tmp_tstamp = ifp->tstamp;
783 spin_unlock_bh(&ifp->lock);
784
785 write_unlock(&idev->lock);
786 ift = !max_addresses ||
787 ipv6_count_addresses(idev) < max_addresses ?
788 ipv6_add_addr(idev, &addr, tmp_plen,
789 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
790 if (!ift || IS_ERR(ift)) {
791 in6_ifa_put(ifp);
792 in6_dev_put(idev);
793 printk(KERN_INFO
794 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
795 tmpaddr = &addr;
796 write_lock(&idev->lock);
797 goto retry;
798 }
799
800 spin_lock_bh(&ift->lock);
801 ift->ifpub = ifp;
802 ift->valid_lft = tmp_valid_lft;
803 ift->prefered_lft = tmp_prefered_lft;
804 ift->cstamp = tmp_cstamp;
805 ift->tstamp = tmp_tstamp;
806 spin_unlock_bh(&ift->lock);
807
808 addrconf_dad_start(ift, 0);
809 in6_ifa_put(ift);
810 in6_dev_put(idev);
811out:
812 return ret;
813}
814#endif
815
816/*
072047e4 817 * Choose an appropriate source address (RFC3484)
1da177e4 818 */
072047e4
YH		 819struct ipv6_saddr_score {
820 int addr_type;
821 unsigned int attrs;
822 int matchlen;
823 unsigned int scope;
824 unsigned int rule;
825};
826
827#define IPV6_SADDR_SCORE_LOCAL 0x0001
828#define IPV6_SADDR_SCORE_PREFERRED 0x0004
829#define IPV6_SADDR_SCORE_HOA 0x0008
830#define IPV6_SADDR_SCORE_OIF 0x0010
831#define IPV6_SADDR_SCORE_LABEL 0x0020
832#define IPV6_SADDR_SCORE_PRIVACY 0x0040
833
834static int inline ipv6_saddr_preferred(int type)
1da177e4 835{
072047e4
YH		 836 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
837 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
838 return 1;
839 return 0;
1da177e4
LT		 840}
841
072047e4
YH		 842/* static matching label */
843static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
844{
845 /*
846 * prefix (longest match) label
847 * -----------------------------
848 * ::1/128 0
849 * ::/0 1
850 * 2002::/16 2
851 * ::/96 3
852 * ::ffff:0:0/96 4
853 */
854 if (type & IPV6_ADDR_LOOPBACK)
855 return 0;
856 else if (type & IPV6_ADDR_COMPATv4)
857 return 3;
858 else if (type & IPV6_ADDR_MAPPED)
859 return 4;
860 else if (addr->s6_addr16[0] == htons(0x2002))
861 return 2;
862 return 1;
863}
1da177e4 864
072047e4 865int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 866 struct in6_addr *daddr, struct in6_addr *saddr)
867{
072047e4
YH		 868 struct ipv6_saddr_score hiscore;
869 struct inet6_ifaddr *ifa_result = NULL;
870 int daddr_type = __ipv6_addr_type(daddr);
871 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
872 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
873 struct net_device *dev;
1da177e4 874
072047e4 875 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 876
072047e4
YH		 877 read_lock(&dev_base_lock);
878 read_lock(&addrconf_lock);
1da177e4 879
072047e4
YH		 880 for (dev = dev_base; dev; dev=dev->next) {
881 struct inet6_dev *idev;
882 struct inet6_ifaddr *ifa;
883
884 /* Rule 0: Candidate Source Address (section 4)
885 * - multicast and link-local destination address,
886 * the set of candidate source address MUST only
887 * include addresses assigned to interfaces
888 * belonging to the same link as the outgoing
889 * interface.
890 * (- For site-local destination addresses, the
891 * set of candidate source addresses MUST only
892 * include addresses assigned to interfaces
893 * belonging to the same site as the outgoing
894 * interface.)
895 */
896 if ((daddr_type & IPV6_ADDR_MULTICAST ||
897 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
898 daddr_dev && dev != daddr_dev)
899 continue;
1da177e4 900
1da177e4 901 idev = __in6_dev_get(dev);
072047e4
YH		 902 if (!idev)
903 continue;
904
905 read_lock_bh(&idev->lock);
906 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
907 struct ipv6_saddr_score score;
908
909 score.addr_type = __ipv6_addr_type(&ifa->addr);
910
911 /* Rule 0: Candidate Source Address (section 4)
912 * - In any case, anycast addresses, multicast
913 * addresses, and the unspecified address MUST
914 * NOT be included in a candidate set.
915 */
916 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
917 score.addr_type & IPV6_ADDR_MULTICAST)) {
918 LIMIT_NETDEBUG(KERN_DEBUG
919 "ADDRCONF: unspecified / multicast address"
920 "assigned as unicast address on %s",
921 dev->name);
922 continue;
923 }
924
925 score.attrs = 0;
926 score.matchlen = 0;
927 score.scope = 0;
928 score.rule = 0;
929
930 if (ifa_result == NULL) {
931 /* record it if the first available entry */
932 goto record_it;
933 }
934
935 /* Rule 1: Prefer same address */
936 if (hiscore.rule < 1) {
937 if (ipv6_addr_equal(&ifa_result->addr, daddr))
938 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
939 hiscore.rule++;
940 }
941 if (ipv6_addr_equal(&ifa->addr, daddr)) {
942 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
943 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
944 score.rule = 1;
945 goto record_it;
1da177e4 946 }
072047e4
YH		 947 } else {
948 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
949 continue;
1da177e4 950 }
1da177e4 951
072047e4
YH		 952 /* Rule 2: Prefer appropriate scope */
953 if (hiscore.rule < 2) {
954 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
955 hiscore.rule++;
956 }
957 score.scope = __ipv6_addr_src_scope(score.addr_type);
958 if (hiscore.scope < score.scope) {
959 if (hiscore.scope < daddr_scope) {
960 score.rule = 2;
961 goto record_it;
962 } else
963 continue;
964 } else if (score.scope < hiscore.scope) {
965 if (score.scope < daddr_scope)
966 continue;
967 else {
968 score.rule = 2;
969 goto record_it;
970 }
971 }
1da177e4 972
072047e4
YH		 973 /* Rule 3: Avoid deprecated address */
974 if (hiscore.rule < 3) {
975 if (ipv6_saddr_preferred(hiscore.addr_type) ||
976 !(ifa_result->flags & IFA_F_DEPRECATED))
977 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
978 hiscore.rule++;
979 }
980 if (ipv6_saddr_preferred(score.addr_type) ||
981 !(ifa->flags & IFA_F_DEPRECATED)) {
982 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
983 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
984 score.rule = 3;
985 goto record_it;
986 }
987 } else {
988 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
989 continue;
990 }
1da177e4 991
072047e4 992 /* Rule 4: Prefer home address -- not implemented yet */
220bbd74
YH		 993 if (hiscore.rule < 4)
994 hiscore.rule++;
072047e4
YH		 995
996 /* Rule 5: Prefer outgoing interface */
997 if (hiscore.rule < 5) {
998 if (daddr_dev == NULL ||
999 daddr_dev == ifa_result->idev->dev)
1000 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1001 hiscore.rule++;
1002 }
1003 if (daddr_dev == NULL ||
1004 daddr_dev == ifa->idev->dev) {
1005 score.attrs |= IPV6_SADDR_SCORE_OIF;
1006 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1007 score.rule = 5;
1008 goto record_it;
1009 }
1010 } else {
1011 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1012 continue;
1013 }
1014
1015 /* Rule 6: Prefer matching label */
1016 if (hiscore.rule < 6) {
1017 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1018 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1019 hiscore.rule++;
1020 }
1021 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1022 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1023 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1024 score.rule = 6;
1025 goto record_it;
1da177e4 1026 }
072047e4
YH		 1027 } else {
1028 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1029 continue;
1030 }
1031
44fd0261 1032#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1033 /* Rule 7: Prefer public address
1034 * Note: prefer temprary address if use_tempaddr >= 2
1035 */
1036 if (hiscore.rule < 7) {
1037 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1038 (ifa_result->idev->cnf.use_tempaddr >= 2))
1039 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1040 hiscore.rule++;
1041 }
1042 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1043 (ifa->idev->cnf.use_tempaddr >= 2)) {
1044 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1045 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1046 score.rule = 7;
1047 goto record_it;
1048 }
1049 } else {
1050 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1051 continue;
1052 }
44fd0261 1053#endif
072047e4 1054 /* Rule 8: Use longest matching prefix */
12da2a43 1055 if (hiscore.rule < 8) {
072047e4 1056 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1057 hiscore.rule++;
1058 }
072047e4
YH		 1059 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1060 if (score.matchlen > hiscore.matchlen) {
1061 score.rule = 8;
1062 goto record_it;
1da177e4 1063 }
072047e4
YH		 1064#if 0
1065 else if (score.matchlen < hiscore.matchlen)
1066 continue;
1067#endif
1068
1069 /* Final Rule: choose first available one */
1070 continue;
1071record_it:
1072 if (ifa_result)
1073 in6_ifa_put(ifa_result);
1074 in6_ifa_hold(ifa);
1075 ifa_result = ifa;
1076 hiscore = score;
1da177e4 1077 }
072047e4 1078 read_unlock_bh(&idev->lock);
1da177e4 1079 }
1da177e4
LT		 1080 read_unlock(&addrconf_lock);
1081 read_unlock(&dev_base_lock);
1082
072047e4
YH		 1083 if (!ifa_result)
1084 return -EADDRNOTAVAIL;
1085
1086 ipv6_addr_copy(saddr, &ifa_result->addr);
1087 in6_ifa_put(ifa_result);
1088 return 0;
1da177e4
LT		 1089}
1090
1091
1092int ipv6_get_saddr(struct dst_entry *dst,
1093 struct in6_addr *daddr, struct in6_addr *saddr)
1094{
1095 return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr);
1096}
1097
1098
1099int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1100{
1101 struct inet6_dev *idev;
1102 int err = -EADDRNOTAVAIL;
1103
1104 read_lock(&addrconf_lock);
1105 if ((idev = __in6_dev_get(dev)) != NULL) {
1106 struct inet6_ifaddr *ifp;
1107
1108 read_lock_bh(&idev->lock);
1109 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1110 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1111 ipv6_addr_copy(addr, &ifp->addr);
1112 err = 0;
1113 break;
1114 }
1115 }
1116 read_unlock_bh(&idev->lock);
1117 }
1118 read_unlock(&addrconf_lock);
1119 return err;
1120}
1121
1122static int ipv6_count_addresses(struct inet6_dev *idev)
1123{
1124 int cnt = 0;
1125 struct inet6_ifaddr *ifp;
1126
1127 read_lock_bh(&idev->lock);
1128 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1129 cnt++;
1130 read_unlock_bh(&idev->lock);
1131 return cnt;
1132}
1133
1134int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1135{
1136 struct inet6_ifaddr * ifp;
1137 u8 hash = ipv6_addr_hash(addr);
1138
1139 read_lock_bh(&addrconf_hash_lock);
1140 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1141 if (ipv6_addr_equal(&ifp->addr, addr) &&
1142 !(ifp->flags&IFA_F_TENTATIVE)) {
1143 if (dev == NULL || ifp->idev->dev == dev ||
1144 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1145 break;
1146 }
1147 }
1148 read_unlock_bh(&addrconf_hash_lock);
1149 return ifp != NULL;
1150}
1151
1152static
1153int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1154{
1155 struct inet6_ifaddr * ifp;
1156 u8 hash = ipv6_addr_hash(addr);
1157
1158 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1159 if (ipv6_addr_equal(&ifp->addr, addr)) {
1160 if (dev == NULL || ifp->idev->dev == dev)
1161 break;
1162 }
1163 }
1164 return ifp != NULL;
1165}
1166
1167struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1168{
1169 struct inet6_ifaddr * ifp;
1170 u8 hash = ipv6_addr_hash(addr);
1171
1172 read_lock_bh(&addrconf_hash_lock);
1173 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1174 if (ipv6_addr_equal(&ifp->addr, addr)) {
1175 if (dev == NULL || ifp->idev->dev == dev ||
1176 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1177 in6_ifa_hold(ifp);
1178 break;
1179 }
1180 }
1181 }
1182 read_unlock_bh(&addrconf_hash_lock);
1183
1184 return ifp;
1185}
1186
1187int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1188{
1189 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1190 const struct in6_addr *sk2_rcv_saddr6 = tcp_v6_rcv_saddr(sk2);
1191 u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
8feaf0c0 1192 u32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1193 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1194 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1195 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1196 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1197
1198 if (!sk2_rcv_saddr && !sk_ipv6only)
1199 return 1;
1200
1201 if (addr_type2 == IPV6_ADDR_ANY &&
1202 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1203 return 1;
1204
1205 if (addr_type == IPV6_ADDR_ANY &&
1206 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1207 return 1;
1208
1209 if (sk2_rcv_saddr6 &&
1210 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1211 return 1;
1212
1213 if (addr_type == IPV6_ADDR_MAPPED &&
1214 !sk2_ipv6only &&
1215 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1216 return 1;
1217
1218 return 0;
1219}
1220
1221/* Gets referenced address, destroys ifaddr */
1222
3c21edbd 1223void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1224{
1da177e4
LT		 1225 if (ifp->flags&IFA_F_PERMANENT) {
1226 spin_lock_bh(&ifp->lock);
1227 addrconf_del_timer(ifp);
1228 ifp->flags |= IFA_F_TENTATIVE;
1229 spin_unlock_bh(&ifp->lock);
1230 in6_ifa_put(ifp);
1231#ifdef CONFIG_IPV6_PRIVACY
1232 } else if (ifp->flags&IFA_F_TEMPORARY) {
1233 struct inet6_ifaddr *ifpub;
1234 spin_lock_bh(&ifp->lock);
1235 ifpub = ifp->ifpub;
1236 if (ifpub) {
1237 in6_ifa_hold(ifpub);
1238 spin_unlock_bh(&ifp->lock);
1239 ipv6_create_tempaddr(ifpub, ifp);
1240 in6_ifa_put(ifpub);
1241 } else {
1242 spin_unlock_bh(&ifp->lock);
1243 }
1244 ipv6_del_addr(ifp);
1245#endif
1246 } else
1247 ipv6_del_addr(ifp);
1248}
1249
3c21edbd
YH		 1250void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1251{
1252 if (net_ratelimit())
1253 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1254 addrconf_dad_stop(ifp);
1255}
1da177e4
LT		 1256
1257/* Join to solicited addr multicast group. */
1258
1259void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1260{
1261 struct in6_addr maddr;
1262
1263 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1264 return;
1265
1266 addrconf_addr_solict_mult(addr, &maddr);
1267 ipv6_dev_mc_inc(dev, &maddr);
1268}
1269
1270void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1271{
1272 struct in6_addr maddr;
1273
1274 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1275 return;
1276
1277 addrconf_addr_solict_mult(addr, &maddr);
1278 __ipv6_dev_mc_dec(idev, &maddr);
1279}
1280
20380731 1281static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1282{
1283 struct in6_addr addr;
1284 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1285 if (ipv6_addr_any(&addr))
1286 return;
1287 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1288}
1289
20380731 1290static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1291{
1292 struct in6_addr addr;
1293 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1294 if (ipv6_addr_any(&addr))
1295 return;
1296 __ipv6_dev_ac_dec(ifp->idev, &addr);
1297}
1298
1299static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1300{
1301 switch (dev->type) {
1302 case ARPHRD_ETHER:
1303 case ARPHRD_FDDI:
1304 case ARPHRD_IEEE802_TR:
1305 if (dev->addr_len != ETH_ALEN)
1306 return -1;
1307 memcpy(eui, dev->dev_addr, 3);
1308 memcpy(eui + 5, dev->dev_addr + 3, 3);
1309
1310 /*
1311 * The zSeries OSA network cards can be shared among various
1312 * OS instances, but the OSA cards have only one MAC address.
1313 * This leads to duplicate address conflicts in conjunction
1314 * with IPv6 if more than one instance uses the same card.
1315 *
1316 * The driver for these cards can deliver a unique 16-bit
1317 * identifier for each instance sharing the same card. It is
1318 * placed instead of 0xFFFE in the interface identifier. The
1319 * "u" bit of the interface identifier is not inverted in this
1320 * case. Hence the resulting interface identifier has local
1321 * scope according to RFC2373.
1322 */
1323 if (dev->dev_id) {
1324 eui[3] = (dev->dev_id >> 8) & 0xFF;
1325 eui[4] = dev->dev_id & 0xFF;
1326 } else {
1327 eui[3] = 0xFF;
1328 eui[4] = 0xFE;
1329 eui[0] ^= 2;
1330 }
1331 return 0;
1332 case ARPHRD_ARCNET:
1333 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1334 if (dev->addr_len != ARCNET_ALEN)
1335 return -1;
1336 memset(eui, 0, 7);
1337 eui[7] = *(u8*)dev->dev_addr;
1338 return 0;
1339 case ARPHRD_INFINIBAND:
1340 if (dev->addr_len != INFINIBAND_ALEN)
1341 return -1;
1342 memcpy(eui, dev->dev_addr + 12, 8);
1343 eui[0] |= 2;
1344 return 0;
1345 }
1346 return -1;
1347}
1348
1349static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1350{
1351 int err = -1;
1352 struct inet6_ifaddr *ifp;
1353
1354 read_lock_bh(&idev->lock);
1355 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1356 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1357 memcpy(eui, ifp->addr.s6_addr+8, 8);
1358 err = 0;
1359 break;
1360 }
1361 }
1362 read_unlock_bh(&idev->lock);
1363 return err;
1364}
1365
1366#ifdef CONFIG_IPV6_PRIVACY
1367/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1368static int __ipv6_regen_rndid(struct inet6_dev *idev)
1369{
1370 struct net_device *dev;
1371 struct scatterlist sg[2];
1372
378f058c
DH		 1373 sg_set_buf(&sg[0], idev->entropy, 8);
1374 sg_set_buf(&sg[1], idev->work_eui64, 8);
1da177e4
LT		 1375
1376 dev = idev->dev;
1377
1378 if (ipv6_generate_eui64(idev->work_eui64, dev)) {
1379 printk(KERN_INFO
1380 "__ipv6_regen_rndid(idev=%p): cannot get EUI64 identifier; use random bytes.\n",
1381 idev);
1382 get_random_bytes(idev->work_eui64, sizeof(idev->work_eui64));
1383 }
1384regen:
1385 spin_lock(&md5_tfm_lock);
1386 if (unlikely(md5_tfm == NULL)) {
1387 spin_unlock(&md5_tfm_lock);
1388 return -1;
1389 }
1390 crypto_digest_init(md5_tfm);
1391 crypto_digest_update(md5_tfm, sg, 2);
1392 crypto_digest_final(md5_tfm, idev->work_digest);
1393 spin_unlock(&md5_tfm_lock);
1394
1395 memcpy(idev->rndid, &idev->work_digest[0], 8);
1396 idev->rndid[0] &= ~0x02;
1397 memcpy(idev->entropy, &idev->work_digest[8], 8);
1398
1399 /*
1400 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1401 * check if generated address is not inappropriate
1402 *
1403 * - Reserved subnet anycast (RFC 2526)
1404 * 11111101 11....11 1xxxxxxx
1405 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1406 * 00-00-5E-FE-xx-xx-xx-xx
1407 * - value 0
1408 * - XXX: already assigned to an address on the device
1409 */
1410 if (idev->rndid[0] == 0xfd &&
1411 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1412 (idev->rndid[7]&0x80))
1413 goto regen;
1414 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1415 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1416 goto regen;
1417 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1418 goto regen;
1419 }
1420
1421 return 0;
1422}
1423
1424static void ipv6_regen_rndid(unsigned long data)
1425{
1426 struct inet6_dev *idev = (struct inet6_dev *) data;
1427 unsigned long expires;
1428
1429 read_lock_bh(&addrconf_lock);
1430 write_lock_bh(&idev->lock);
1431
1432 if (idev->dead)
1433 goto out;
1434
1435 if (__ipv6_regen_rndid(idev) < 0)
1436 goto out;
1437
1438 expires = jiffies +
1439 idev->cnf.temp_prefered_lft * HZ -
1440 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1441 if (time_before(expires, jiffies)) {
1442 printk(KERN_WARNING
1443 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1444 idev->dev->name);
1445 goto out;
1446 }
1447
1448 if (!mod_timer(&idev->regen_timer, expires))
1449 in6_dev_hold(idev);
1450
1451out:
1452 write_unlock_bh(&idev->lock);
1453 read_unlock_bh(&addrconf_lock);
1454 in6_dev_put(idev);
1455}
1456
1457static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1458 int ret = 0;
1459
1460 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1461 ret = __ipv6_regen_rndid(idev);
1462 return ret;
1463}
1464#endif
1465
1466/*
1467 * Add prefix route.
1468 */
1469
1470static void
1471addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1472 unsigned long expires, u32 flags)
1da177e4
LT		 1473{
1474 struct in6_rtmsg rtmsg;
1475
1476 memset(&rtmsg, 0, sizeof(rtmsg));
1477 ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx);
1478 rtmsg.rtmsg_dst_len = plen;
1479 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1480 rtmsg.rtmsg_ifindex = dev->ifindex;
1481 rtmsg.rtmsg_info = expires;
1482 rtmsg.rtmsg_flags = RTF_UP|flags;
1483 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1484
1485 /* Prevent useless cloning on PtP SIT.
1486 This thing is done here expecting that the whole
1487 class of non-broadcast devices need not cloning.
1488 */
1489 if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT))
1490 rtmsg.rtmsg_flags |= RTF_NONEXTHOP;
1491
0d51aa80 1492 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1493}
1494
1495/* Create "default" multicast route to the interface */
1496
1497static void addrconf_add_mroute(struct net_device *dev)
1498{
1499 struct in6_rtmsg rtmsg;
1500
1501 memset(&rtmsg, 0, sizeof(rtmsg));
1502 ipv6_addr_set(&rtmsg.rtmsg_dst,
1503 htonl(0xFF000000), 0, 0, 0);
1504 rtmsg.rtmsg_dst_len = 8;
1505 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1506 rtmsg.rtmsg_ifindex = dev->ifindex;
1507 rtmsg.rtmsg_flags = RTF_UP;
1508 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
0d51aa80 1509 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1510}
1511
1512static void sit_route_add(struct net_device *dev)
1513{
1514 struct in6_rtmsg rtmsg;
1515
1516 memset(&rtmsg, 0, sizeof(rtmsg));
1517
1518 rtmsg.rtmsg_type = RTMSG_NEWROUTE;
1519 rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
1520
1521 /* prefix length - 96 bits "::d.d.d.d" */
1522 rtmsg.rtmsg_dst_len = 96;
1523 rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP;
1524 rtmsg.rtmsg_ifindex = dev->ifindex;
1525
0d51aa80 1526 ip6_route_add(&rtmsg, NULL, NULL, NULL);
1da177e4
LT		 1527}
1528
1529static void addrconf_add_lroute(struct net_device *dev)
1530{
1531 struct in6_addr addr;
1532
1533 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1534 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1535}
1536
1537static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1538{
1539 struct inet6_dev *idev;
1540
1541 ASSERT_RTNL();
1542
1543 if ((idev = ipv6_find_idev(dev)) == NULL)
1544 return NULL;
1545
1546 /* Add default multicast route */
1547 addrconf_add_mroute(dev);
1548
1549 /* Add link local route */
1550 addrconf_add_lroute(dev);
1551 return idev;
1552}
1553
1554void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1555{
1556 struct prefix_info *pinfo;
1557 __u32 valid_lft;
1558 __u32 prefered_lft;
1559 int addr_type;
1560 unsigned long rt_expires;
1561 struct inet6_dev *in6_dev;
1562
1563 pinfo = (struct prefix_info *) opt;
1564
1565 if (len < sizeof(struct prefix_info)) {
1566 ADBG(("addrconf: prefix option too short\n"));
1567 return;
1568 }
1569
1570 /*
1571 * Validation checks ([ADDRCONF], page 19)
1572 */
1573
1574 addr_type = ipv6_addr_type(&pinfo->prefix);
1575
1576 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1577 return;
1578
1579 valid_lft = ntohl(pinfo->valid);
1580 prefered_lft = ntohl(pinfo->prefered);
1581
1582 if (prefered_lft > valid_lft) {
1583 if (net_ratelimit())
1584 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1585 return;
1586 }
1587
1588 in6_dev = in6_dev_get(dev);
1589
1590 if (in6_dev == NULL) {
1591 if (net_ratelimit())
1592 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1593 return;
1594 }
1595
1596 /*
1597 * Two things going on here:
1598 * 1) Add routes for on-link prefixes
1599 * 2) Configure prefixes with the auto flag set
1600 */
1601
1602 /* Avoid arithmetic overflow. Really, we could
1603 save rt_expires in seconds, likely valid_lft,
1604 but it would require division in fib gc, that it
1605 not good.
1606 */
1607 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1608 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1609 else
3dd4bc68
YH		 1610 rt_expires = valid_lft * HZ;
1611
1612 /*
1613 * We convert this (in jiffies) to clock_t later.
1614 * Avoid arithmetic overflow there as well.
1615 * Overflow can happen only if HZ < USER_HZ.
1616 */
1617 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1618 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1619
1620 if (pinfo->onlink) {
1621 struct rt6_info *rt;
1622 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1623
1624 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1625 if (rt->rt6i_flags&RTF_EXPIRES) {
1626 if (valid_lft == 0) {
0d51aa80 1627 ip6_del_rt(rt, NULL, NULL, NULL);
1da177e4
LT		 1628 rt = NULL;
1629 } else {
3dd4bc68 1630 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1631 }
1632 }
1633 } else if (valid_lft) {
1634 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1635 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1636 }
1637 if (rt)
1638 dst_release(&rt->u.dst);
1639 }
1640
1641 /* Try to figure out our local address for this prefix */
1642
1643 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1644 struct inet6_ifaddr * ifp;
1645 struct in6_addr addr;
1646 int create = 0, update_lft = 0;
1647
1648 if (pinfo->prefix_len == 64) {
1649 memcpy(&addr, &pinfo->prefix, 8);
1650 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1651 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1652 in6_dev_put(in6_dev);
1653 return;
1654 }
1655 goto ok;
1656 }
1657 if (net_ratelimit())
1658 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1659 pinfo->prefix_len);
1660 in6_dev_put(in6_dev);
1661 return;
1662
1663ok:
1664
1665 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1666
1667 if (ifp == NULL && valid_lft) {
1668 int max_addresses = in6_dev->cnf.max_addresses;
1669
1670 /* Do not allow to create too much of autoconfigured
1671 * addresses; this would be too easy way to crash kernel.
1672 */
1673 if (!max_addresses ||
1674 ipv6_count_addresses(in6_dev) < max_addresses)
1675 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1676 addr_type&IPV6_ADDR_SCOPE_MASK, 0);
1677
1678 if (!ifp || IS_ERR(ifp)) {
1679 in6_dev_put(in6_dev);
1680 return;
1681 }
1682
1683 update_lft = create = 1;
1684 ifp->cstamp = jiffies;
1685 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1686 }
1687
1688 if (ifp) {
1689 int flags;
1690 unsigned long now;
1691#ifdef CONFIG_IPV6_PRIVACY
1692 struct inet6_ifaddr *ift;
1693#endif
1694 u32 stored_lft;
1695
1696 /* update lifetime (RFC2462 5.5.3 e) */
1697 spin_lock(&ifp->lock);
1698 now = jiffies;
1699 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1700 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1701 else
1702 stored_lft = 0;
1703 if (!update_lft && stored_lft) {
1704 if (valid_lft > MIN_VALID_LIFETIME ||
1705 valid_lft > stored_lft)
1706 update_lft = 1;
1707 else if (stored_lft <= MIN_VALID_LIFETIME) {
1708 /* valid_lft <= stored_lft is always true */
1709 /* XXX: IPsec */
1710 update_lft = 0;
1711 } else {
1712 valid_lft = MIN_VALID_LIFETIME;
1713 if (valid_lft < prefered_lft)
1714 prefered_lft = valid_lft;
1715 update_lft = 1;
1716 }
1717 }
1718
1719 if (update_lft) {
1720 ifp->valid_lft = valid_lft;
1721 ifp->prefered_lft = prefered_lft;
1722 ifp->tstamp = now;
1723 flags = ifp->flags;
1724 ifp->flags &= ~IFA_F_DEPRECATED;
1725 spin_unlock(&ifp->lock);
1726
1727 if (!(flags&IFA_F_TENTATIVE))
1728 ipv6_ifa_notify(0, ifp);
1729 } else
1730 spin_unlock(&ifp->lock);
1731
1732#ifdef CONFIG_IPV6_PRIVACY
1733 read_lock_bh(&in6_dev->lock);
1734 /* update all temporary addresses in the list */
1735 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1736 /*
1737 * When adjusting the lifetimes of an existing
1738 * temporary address, only lower the lifetimes.
1739 * Implementations must not increase the
1740 * lifetimes of an existing temporary address
1741 * when processing a Prefix Information Option.
1742 */
1743 spin_lock(&ift->lock);
1744 flags = ift->flags;
1745 if (ift->valid_lft > valid_lft &&
1746 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1747 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1748 if (ift->prefered_lft > prefered_lft &&
1749 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1750 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1751 spin_unlock(&ift->lock);
1752 if (!(flags&IFA_F_TENTATIVE))
1753 ipv6_ifa_notify(0, ift);
1754 }
1755
1756 if (create && in6_dev->cnf.use_tempaddr > 0) {
1757 /*
1758 * When a new public address is created as described in [ADDRCONF],
1759 * also create a new temporary address.
1760 */
1761 read_unlock_bh(&in6_dev->lock);
1762 ipv6_create_tempaddr(ifp, NULL);
1763 } else {
1764 read_unlock_bh(&in6_dev->lock);
1765 }
1766#endif
1767 in6_ifa_put(ifp);
1768 addrconf_verify(0);
1769 }
1770 }
1771 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1772 in6_dev_put(in6_dev);
1773}
1774
1775/*
1776 * Set destination address.
1777 * Special case for SIT interfaces where we create a new "virtual"
1778 * device.
1779 */
1780int addrconf_set_dstaddr(void __user *arg)
1781{
1782 struct in6_ifreq ireq;
1783 struct net_device *dev;
1784 int err = -EINVAL;
1785
1786 rtnl_lock();
1787
1788 err = -EFAULT;
1789 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1790 goto err_exit;
1791
1792 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1793
1794 err = -ENODEV;
1795 if (dev == NULL)
1796 goto err_exit;
1797
1798 if (dev->type == ARPHRD_SIT) {
1799 struct ifreq ifr;
1800 mm_segment_t oldfs;
1801 struct ip_tunnel_parm p;
1802
1803 err = -EADDRNOTAVAIL;
1804 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1805 goto err_exit;
1806
1807 memset(&p, 0, sizeof(p));
1808 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1809 p.iph.saddr = 0;
1810 p.iph.version = 4;
1811 p.iph.ihl = 5;
1812 p.iph.protocol = IPPROTO_IPV6;
1813 p.iph.ttl = 64;
1814 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1815
1816 oldfs = get_fs(); set_fs(KERNEL_DS);
1817 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1818 set_fs(oldfs);
1819
1820 if (err == 0) {
1821 err = -ENOBUFS;
1822 if ((dev = __dev_get_by_name(p.name)) == NULL)
1823 goto err_exit;
1824 err = dev_open(dev);
1825 }
1826 }
1827
1828err_exit:
1829 rtnl_unlock();
1830 return err;
1831}
1832
1833/*
1834 * Manual configuration of address on an interface
1835 */
1836static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen)
1837{
1838 struct inet6_ifaddr *ifp;
1839 struct inet6_dev *idev;
1840 struct net_device *dev;
1841 int scope;
1842
1843 ASSERT_RTNL();
1844
1845 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1846 return -ENODEV;
1847
1848 if (!(dev->flags&IFF_UP))
1849 return -ENETDOWN;
1850
1851 if ((idev = addrconf_add_dev(dev)) == NULL)
1852 return -ENOBUFS;
1853
1854 scope = ipv6_addr_scope(pfx);
1855
1856 ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT);
1857 if (!IS_ERR(ifp)) {
1858 addrconf_dad_start(ifp, 0);
1859 in6_ifa_put(ifp);
1860 return 0;
1861 }
1862
1863 return PTR_ERR(ifp);
1864}
1865
1866static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1867{
1868 struct inet6_ifaddr *ifp;
1869 struct inet6_dev *idev;
1870 struct net_device *dev;
1871
1872 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1873 return -ENODEV;
1874
1875 if ((idev = __in6_dev_get(dev)) == NULL)
1876 return -ENXIO;
1877
1878 read_lock_bh(&idev->lock);
1879 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1880 if (ifp->prefix_len == plen &&
1881 ipv6_addr_equal(pfx, &ifp->addr)) {
1882 in6_ifa_hold(ifp);
1883 read_unlock_bh(&idev->lock);
1884
1885 ipv6_del_addr(ifp);
1886
1887 /* If the last address is deleted administratively,
1888 disable IPv6 on this interface.
1889 */
1890 if (idev->addr_list == NULL)
1891 addrconf_ifdown(idev->dev, 1);
1892 return 0;
1893 }
1894 }
1895 read_unlock_bh(&idev->lock);
1896 return -EADDRNOTAVAIL;
1897}
1898
1899
1900int addrconf_add_ifaddr(void __user *arg)
1901{
1902 struct in6_ifreq ireq;
1903 int err;
1904
1905 if (!capable(CAP_NET_ADMIN))
1906 return -EPERM;
1907
1908 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1909 return -EFAULT;
1910
1911 rtnl_lock();
1912 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1913 rtnl_unlock();
1914 return err;
1915}
1916
1917int addrconf_del_ifaddr(void __user *arg)
1918{
1919 struct in6_ifreq ireq;
1920 int err;
1921
1922 if (!capable(CAP_NET_ADMIN))
1923 return -EPERM;
1924
1925 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1926 return -EFAULT;
1927
1928 rtnl_lock();
1929 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1930 rtnl_unlock();
1931 return err;
1932}
1933
1934static void sit_add_v4_addrs(struct inet6_dev *idev)
1935{
1936 struct inet6_ifaddr * ifp;
1937 struct in6_addr addr;
1938 struct net_device *dev;
1939 int scope;
1940
1941 ASSERT_RTNL();
1942
1943 memset(&addr, 0, sizeof(struct in6_addr));
1944 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1945
1946 if (idev->dev->flags&IFF_POINTOPOINT) {
1947 addr.s6_addr32[0] = htonl(0xfe800000);
1948 scope = IFA_LINK;
1949 } else {
1950 scope = IPV6_ADDR_COMPATv4;
1951 }
1952
1953 if (addr.s6_addr32[3]) {
1954 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1955 if (!IS_ERR(ifp)) {
1956 spin_lock_bh(&ifp->lock);
1957 ifp->flags &= ~IFA_F_TENTATIVE;
1958 spin_unlock_bh(&ifp->lock);
1959 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1960 in6_ifa_put(ifp);
1961 }
1962 return;
1963 }
1964
1965 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 1966 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1967 if (in_dev && (dev->flags & IFF_UP)) {
1968 struct in_ifaddr * ifa;
1969
1970 int flag = scope;
1971
1972 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1973 int plen;
1974
1975 addr.s6_addr32[3] = ifa->ifa_local;
1976
1977 if (ifa->ifa_scope == RT_SCOPE_LINK)
1978 continue;
1979 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
1980 if (idev->dev->flags&IFF_POINTOPOINT)
1981 continue;
1982 flag |= IFA_HOST;
1983 }
1984 if (idev->dev->flags&IFF_POINTOPOINT)
1985 plen = 64;
1986 else
1987 plen = 96;
1988
1989 ifp = ipv6_add_addr(idev, &addr, plen, flag,
1990 IFA_F_PERMANENT);
1991 if (!IS_ERR(ifp)) {
1992 spin_lock_bh(&ifp->lock);
1993 ifp->flags &= ~IFA_F_TENTATIVE;
1994 spin_unlock_bh(&ifp->lock);
1995 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1996 in6_ifa_put(ifp);
1997 }
1998 }
1999 }
2000 }
2001}
2002
2003static void init_loopback(struct net_device *dev)
2004{
2005 struct inet6_dev *idev;
2006 struct inet6_ifaddr * ifp;
2007
2008 /* ::1 */
2009
2010 ASSERT_RTNL();
2011
2012 if ((idev = ipv6_find_idev(dev)) == NULL) {
2013 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2014 return;
2015 }
2016
2017 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2018 if (!IS_ERR(ifp)) {
2019 spin_lock_bh(&ifp->lock);
2020 ifp->flags &= ~IFA_F_TENTATIVE;
2021 spin_unlock_bh(&ifp->lock);
2022 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2023 in6_ifa_put(ifp);
2024 }
2025}
2026
2027static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2028{
2029 struct inet6_ifaddr * ifp;
2030
2031 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2032 if (!IS_ERR(ifp)) {
2033 addrconf_dad_start(ifp, 0);
2034 in6_ifa_put(ifp);
2035 }
2036}
2037
2038static void addrconf_dev_config(struct net_device *dev)
2039{
2040 struct in6_addr addr;
2041 struct inet6_dev * idev;
2042
2043 ASSERT_RTNL();
2044
2045 if ((dev->type != ARPHRD_ETHER) &&
2046 (dev->type != ARPHRD_FDDI) &&
2047 (dev->type != ARPHRD_IEEE802_TR) &&
2048 (dev->type != ARPHRD_ARCNET) &&
2049 (dev->type != ARPHRD_INFINIBAND)) {
2050 /* Alas, we support only Ethernet autoconfiguration. */
2051 return;
2052 }
2053
2054 idev = addrconf_add_dev(dev);
2055 if (idev == NULL)
2056 return;
2057
2058 memset(&addr, 0, sizeof(struct in6_addr));
2059 addr.s6_addr32[0] = htonl(0xFE800000);
2060
2061 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2062 addrconf_add_linklocal(idev, &addr);
2063}
2064
2065static void addrconf_sit_config(struct net_device *dev)
2066{
2067 struct inet6_dev *idev;
2068
2069 ASSERT_RTNL();
2070
2071 /*
2072 * Configure the tunnel with one of our IPv4
2073 * addresses... we should configure all of
2074 * our v4 addrs in the tunnel
2075 */
2076
2077 if ((idev = ipv6_find_idev(dev)) == NULL) {
2078 printk(KERN_DEBUG "init sit: add_dev failed\n");
2079 return;
2080 }
2081
2082 sit_add_v4_addrs(idev);
2083
2084 if (dev->flags&IFF_POINTOPOINT) {
2085 addrconf_add_mroute(dev);
2086 addrconf_add_lroute(dev);
2087 } else
2088 sit_route_add(dev);
2089}
2090
2091static inline int
2092ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2093{
2094 struct in6_addr lladdr;
2095
2096 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2097 addrconf_add_linklocal(idev, &lladdr);
2098 return 0;
2099 }
2100 return -1;
2101}
2102
2103static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2104{
2105 struct net_device *link_dev;
2106
2107 /* first try to inherit the link-local address from the link device */
2108 if (idev->dev->iflink &&
2109 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2110 if (!ipv6_inherit_linklocal(idev, link_dev))
2111 return;
2112 }
2113 /* then try to inherit it from any device */
2114 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2115 if (!ipv6_inherit_linklocal(idev, link_dev))
2116 return;
2117 }
2118 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2119}
2120
2121/*
2122 * Autoconfigure tunnel with a link-local address so routing protocols,
2123 * DHCPv6, MLD etc. can be run over the virtual link
2124 */
2125
2126static void addrconf_ip6_tnl_config(struct net_device *dev)
2127{
2128 struct inet6_dev *idev;
2129
2130 ASSERT_RTNL();
2131
2132 if ((idev = addrconf_add_dev(dev)) == NULL) {
2133 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2134 return;
2135 }
2136 ip6_tnl_add_linklocal(idev);
2137 addrconf_add_mroute(dev);
2138}
2139
2140static int addrconf_notify(struct notifier_block *this, unsigned long event,
2141 void * data)
2142{
2143 struct net_device *dev = (struct net_device *) data;
2144 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2145 int run_pending = 0;
1da177e4
LT		 2146
2147 switch(event) {
2148 case NETDEV_UP:
3c21edbd
YH		 2149 case NETDEV_CHANGE:
2150 if (event == NETDEV_UP) {
2151 if (!netif_carrier_ok(dev)) {
2152 /* device is not ready yet. */
2153 printk(KERN_INFO
2154 "ADDRCONF(NETDEV_UP): %s: "
2155 "link is not ready\n",
2156 dev->name);
2157 break;
2158 }
2159 } else {
2160 if (!netif_carrier_ok(dev)) {
2161 /* device is still not ready. */
2162 break;
2163 }
2164
2165 if (idev) {
2166 if (idev->if_flags & IF_READY) {
2167 /* device is already configured. */
2168 break;
2169 }
2170 idev->if_flags |= IF_READY;
2171 }
2172
2173 printk(KERN_INFO
2174 "ADDRCONF(NETDEV_CHANGE): %s: "
2175 "link becomes ready\n",
2176 dev->name);
2177
c5e33bdd 2178 run_pending = 1;
3c21edbd
YH		 2179 }
2180
1da177e4
LT		 2181 switch(dev->type) {
2182 case ARPHRD_SIT:
2183 addrconf_sit_config(dev);
2184 break;
2185 case ARPHRD_TUNNEL6:
2186 addrconf_ip6_tnl_config(dev);
2187 break;
2188 case ARPHRD_LOOPBACK:
2189 init_loopback(dev);
2190 break;
2191
2192 default:
2193 addrconf_dev_config(dev);
2194 break;
2195 };
2196 if (idev) {
c5e33bdd
YH		 2197 if (run_pending)
2198 addrconf_dad_run(idev);
2199
1da177e4
LT		 2200 /* If the MTU changed during the interface down, when the
2201 interface up, the changed MTU must be reflected in the
2202 idev as well as routers.
2203 */
2204 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2205 rt6_mtu_change(dev, dev->mtu);
2206 idev->cnf.mtu6 = dev->mtu;
2207 }
2208 idev->tstamp = jiffies;
2209 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2210 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2211 stop IPv6 on this interface.
2212 */
2213 if (dev->mtu < IPV6_MIN_MTU)
2214 addrconf_ifdown(dev, event != NETDEV_DOWN);
2215 }
2216 break;
2217
2218 case NETDEV_CHANGEMTU:
2219 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2220 rt6_mtu_change(dev, dev->mtu);
2221 idev->cnf.mtu6 = dev->mtu;
2222 break;
2223 }
2224
2225 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2226
2227 case NETDEV_DOWN:
2228 case NETDEV_UNREGISTER:
2229 /*
2230 * Remove all addresses from this interface.
2231 */
2232 addrconf_ifdown(dev, event != NETDEV_DOWN);
2233 break;
3c21edbd 2234
1da177e4
LT		 2235 case NETDEV_CHANGENAME:
2236#ifdef CONFIG_SYSCTL
2237 if (idev) {
2238 addrconf_sysctl_unregister(&idev->cnf);
2239 neigh_sysctl_unregister(idev->nd_parms);
2240 neigh_sysctl_register(dev, idev->nd_parms,
2241 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2242 &ndisc_ifinfo_sysctl_change,
2243 NULL);
2244 addrconf_sysctl_register(idev, &idev->cnf);
2245 }
2246#endif
2247 break;
2248 };
2249
2250 return NOTIFY_OK;
2251}
2252
2253/*
2254 * addrconf module should be notified of a device going up
2255 */
2256static struct notifier_block ipv6_dev_notf = {
2257 .notifier_call = addrconf_notify,
2258 .priority = 0
2259};
2260
2261static int addrconf_ifdown(struct net_device *dev, int how)
2262{
2263 struct inet6_dev *idev;
2264 struct inet6_ifaddr *ifa, **bifa;
2265 int i;
2266
2267 ASSERT_RTNL();
2268
2269 if (dev == &loopback_dev && how == 1)
2270 how = 0;
2271
2272 rt6_ifdown(dev);
2273 neigh_ifdown(&nd_tbl, dev);
2274
2275 idev = __in6_dev_get(dev);
2276 if (idev == NULL)
2277 return -ENODEV;
2278
2279 /* Step 1: remove reference to ipv6 device from parent device.
2280 Do not dev_put!
2281 */
2282 if (how == 1) {
2283 write_lock_bh(&addrconf_lock);
2284 dev->ip6_ptr = NULL;
2285 idev->dead = 1;
2286 write_unlock_bh(&addrconf_lock);
2287
2288 /* Step 1.5: remove snmp6 entry */
2289 snmp6_unregister_dev(idev);
2290
2291 }
2292
2293 /* Step 2: clear hash table */
2294 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2295 bifa = &inet6_addr_lst[i];
2296
2297 write_lock_bh(&addrconf_hash_lock);
2298 while ((ifa = *bifa) != NULL) {
2299 if (ifa->idev == idev) {
2300 *bifa = ifa->lst_next;
2301 ifa->lst_next = NULL;
2302 addrconf_del_timer(ifa);
2303 in6_ifa_put(ifa);
2304 continue;
2305 }
2306 bifa = &ifa->lst_next;
2307 }
2308 write_unlock_bh(&addrconf_hash_lock);
2309 }
2310
2311 write_lock_bh(&idev->lock);
2312
2313 /* Step 3: clear flags for stateless addrconf */
2314 if (how != 1)
3c21edbd 2315 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2316
2317 /* Step 4: clear address list */
2318#ifdef CONFIG_IPV6_PRIVACY
2319 if (how == 1 && del_timer(&idev->regen_timer))
2320 in6_dev_put(idev);
2321
2322 /* clear tempaddr list */
2323 while ((ifa = idev->tempaddr_list) != NULL) {
2324 idev->tempaddr_list = ifa->tmp_next;
2325 ifa->tmp_next = NULL;
2326 ifa->dead = 1;
2327 write_unlock_bh(&idev->lock);
2328 spin_lock_bh(&ifa->lock);
2329
2330 if (ifa->ifpub) {
2331 in6_ifa_put(ifa->ifpub);
2332 ifa->ifpub = NULL;
2333 }
2334 spin_unlock_bh(&ifa->lock);
2335 in6_ifa_put(ifa);
2336 write_lock_bh(&idev->lock);
2337 }
2338#endif
2339 while ((ifa = idev->addr_list) != NULL) {
2340 idev->addr_list = ifa->if_next;
2341 ifa->if_next = NULL;
2342 ifa->dead = 1;
2343 addrconf_del_timer(ifa);
2344 write_unlock_bh(&idev->lock);
2345
2346 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2347 in6_ifa_put(ifa);
2348
2349 write_lock_bh(&idev->lock);
2350 }
2351 write_unlock_bh(&idev->lock);
2352
2353 /* Step 5: Discard multicast list */
2354
2355 if (how == 1)
2356 ipv6_mc_destroy_dev(idev);
2357 else
2358 ipv6_mc_down(idev);
2359
2360 /* Step 5: netlink notification of this interface */
2361 idev->tstamp = jiffies;
979ad663 2362 inet6_ifinfo_notify(RTM_DELLINK, idev);
1da177e4
LT		 2363
2364 /* Shot the device (if unregistered) */
2365
2366 if (how == 1) {
2367#ifdef CONFIG_SYSCTL
2368 addrconf_sysctl_unregister(&idev->cnf);
2369 neigh_sysctl_unregister(idev->nd_parms);
2370#endif
2371 neigh_parms_release(&nd_tbl, idev->nd_parms);
2372 neigh_ifdown(&nd_tbl, dev);
2373 in6_dev_put(idev);
2374 }
2375 return 0;
2376}
2377
2378static void addrconf_rs_timer(unsigned long data)
2379{
2380 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2381
2382 if (ifp->idev->cnf.forwarding)
2383 goto out;
2384
2385 if (ifp->idev->if_flags & IF_RA_RCVD) {
2386 /*
2387 * Announcement received after solicitation
2388 * was sent
2389 */
2390 goto out;
2391 }
2392
2393 spin_lock(&ifp->lock);
2394 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2395 struct in6_addr all_routers;
2396
2397 /* The wait after the last probe can be shorter */
2398 addrconf_mod_timer(ifp, AC_RS,
2399 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2400 ifp->idev->cnf.rtr_solicit_delay :
2401 ifp->idev->cnf.rtr_solicit_interval);
2402 spin_unlock(&ifp->lock);
2403
2404 ipv6_addr_all_routers(&all_routers);
2405
2406 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2407 } else {
2408 spin_unlock(&ifp->lock);
2409 /*
2410 * Note: we do not support deprecated "all on-link"
2411 * assumption any longer.
2412 */
2413 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2414 ifp->idev->dev->name);
2415 }
2416
2417out:
2418 in6_ifa_put(ifp);
2419}
2420
2421/*
2422 * Duplicate Address Detection
2423 */
3c21edbd
YH		 2424static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2425{
2426 unsigned long rand_num;
2427 struct inet6_dev *idev = ifp->idev;
2428
2429 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2430 ifp->probes = idev->cnf.dad_transmits;
2431 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2432}
2433
e431b8c0 2434static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2435{
2436 struct inet6_dev *idev = ifp->idev;
2437 struct net_device *dev = idev->dev;
1da177e4
LT		 2438
2439 addrconf_join_solict(dev, &ifp->addr);
2440
2441 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2442 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2443 flags);
2444
2445 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2446
2447 read_lock_bh(&idev->lock);
2448 if (ifp->dead)
2449 goto out;
2450 spin_lock_bh(&ifp->lock);
2451
2452 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2453 !(ifp->flags&IFA_F_TENTATIVE)) {
2454 ifp->flags &= ~IFA_F_TENTATIVE;
2455 spin_unlock_bh(&ifp->lock);
2456 read_unlock_bh(&idev->lock);
2457
2458 addrconf_dad_completed(ifp);
2459 return;
2460 }
2461
3c21edbd
YH		 2462 if (idev->if_flags & IF_READY)
2463 addrconf_dad_kick(ifp);
2464 else {
2465 /*
2466 * If the defice is not ready:
2467 * - keep it tentative if it is a permanent address.
2468 * - otherwise, kill it.
2469 */
2470 in6_ifa_hold(ifp);
2471 addrconf_dad_stop(ifp);
2472 }
1da177e4
LT		 2473
2474 spin_unlock_bh(&ifp->lock);
2475out:
2476 read_unlock_bh(&idev->lock);
2477}
2478
2479static void addrconf_dad_timer(unsigned long data)
2480{
2481 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2482 struct inet6_dev *idev = ifp->idev;
2483 struct in6_addr unspec;
2484 struct in6_addr mcaddr;
2485
2486 read_lock_bh(&idev->lock);
2487 if (idev->dead) {
2488 read_unlock_bh(&idev->lock);
2489 goto out;
2490 }
2491 spin_lock_bh(&ifp->lock);
2492 if (ifp->probes == 0) {
2493 /*
2494 * DAD was successful
2495 */
2496
2497 ifp->flags &= ~IFA_F_TENTATIVE;
2498 spin_unlock_bh(&ifp->lock);
2499 read_unlock_bh(&idev->lock);
2500
2501 addrconf_dad_completed(ifp);
2502
2503 goto out;
2504 }
2505
2506 ifp->probes--;
2507 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2508 spin_unlock_bh(&ifp->lock);
2509 read_unlock_bh(&idev->lock);
2510
2511 /* send a neighbour solicitation for our addr */
2512 memset(&unspec, 0, sizeof(unspec));
2513 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2514 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2515out:
2516 in6_ifa_put(ifp);
2517}
2518
2519static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2520{
2521 struct net_device * dev = ifp->idev->dev;
2522
2523 /*
2524 * Configure the address for reception. Now it is valid.
2525 */
2526
2527 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2528
2529 /* If added prefix is link local and forwarding is off,
2530 start sending router solicitations.
2531 */
2532
2533 if (ifp->idev->cnf.forwarding == 0 &&
2534 ifp->idev->cnf.rtr_solicits > 0 &&
2535 (dev->flags&IFF_LOOPBACK) == 0 &&
2536 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2537 struct in6_addr all_routers;
2538
2539 ipv6_addr_all_routers(&all_routers);
2540
2541 /*
2542 * If a host as already performed a random delay
2543 * [...] as part of DAD [...] there is no need
2544 * to delay again before sending the first RS
2545 */
2546 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2547
2548 spin_lock_bh(&ifp->lock);
2549 ifp->probes = 1;
2550 ifp->idev->if_flags |= IF_RS_SENT;
2551 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2552 spin_unlock_bh(&ifp->lock);
2553 }
2554}
2555
c5e33bdd
YH		 2556static void addrconf_dad_run(struct inet6_dev *idev) {
2557 struct inet6_ifaddr *ifp;
2558
2559 read_lock_bh(&idev->lock);
2560 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2561 spin_lock_bh(&ifp->lock);
2562 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2563 spin_unlock_bh(&ifp->lock);
2564 continue;
2565 }
2566 spin_unlock_bh(&ifp->lock);
2567 addrconf_dad_kick(ifp);
2568 }
2569 read_unlock_bh(&idev->lock);
2570}
2571
1da177e4
LT		 2572#ifdef CONFIG_PROC_FS
2573struct if6_iter_state {
2574 int bucket;
2575};
2576
2577static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2578{
2579 struct inet6_ifaddr *ifa = NULL;
2580 struct if6_iter_state *state = seq->private;
2581
2582 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2583 ifa = inet6_addr_lst[state->bucket];
2584 if (ifa)
2585 break;
2586 }
2587 return ifa;
2588}
2589
2590static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2591{
2592 struct if6_iter_state *state = seq->private;
2593
2594 ifa = ifa->lst_next;
2595try_again:
2596 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2597 ifa = inet6_addr_lst[state->bucket];
2598 goto try_again;
2599 }
2600 return ifa;
2601}
2602
2603static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2604{
2605 struct inet6_ifaddr *ifa = if6_get_first(seq);
2606
2607 if (ifa)
2608 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2609 --pos;
2610 return pos ? NULL : ifa;
2611}
2612
2613static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2614{
2615 read_lock_bh(&addrconf_hash_lock);
2616 return if6_get_idx(seq, *pos);
2617}
2618
2619static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2620{
2621 struct inet6_ifaddr *ifa;
2622
2623 ifa = if6_get_next(seq, v);
2624 ++*pos;
2625 return ifa;
2626}
2627
2628static void if6_seq_stop(struct seq_file *seq, void *v)
2629{
2630 read_unlock_bh(&addrconf_hash_lock);
2631}
2632
2633static int if6_seq_show(struct seq_file *seq, void *v)
2634{
2635 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2636 seq_printf(seq,
2637 "%04x%04x%04x%04x%04x%04x%04x%04x %02x %02x %02x %02x %8s\n",
2638 NIP6(ifp->addr),
2639 ifp->idev->dev->ifindex,
2640 ifp->prefix_len,
2641 ifp->scope,
2642 ifp->flags,
2643 ifp->idev->dev->name);
2644 return 0;
2645}
2646
2647static struct seq_operations if6_seq_ops = {
2648 .start = if6_seq_start,
2649 .next = if6_seq_next,
2650 .show = if6_seq_show,
2651 .stop = if6_seq_stop,
2652};
2653
2654static int if6_seq_open(struct inode *inode, struct file *file)
2655{
2656 struct seq_file *seq;
2657 int rc = -ENOMEM;
2658 struct if6_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2659
2660 if (!s)
2661 goto out;
2662 memset(s, 0, sizeof(*s));
2663
2664 rc = seq_open(file, &if6_seq_ops);
2665 if (rc)
2666 goto out_kfree;
2667
2668 seq = file->private_data;
2669 seq->private = s;
2670out:
2671 return rc;
2672out_kfree:
2673 kfree(s);
2674 goto out;
2675}
2676
2677static struct file_operations if6_fops = {
2678 .owner = THIS_MODULE,
2679 .open = if6_seq_open,
2680 .read = seq_read,
2681 .llseek = seq_lseek,
2682 .release = seq_release_private,
2683};
2684
2685int __init if6_proc_init(void)
2686{
2687 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2688 return -ENOMEM;
2689 return 0;
2690}
2691
2692void if6_proc_exit(void)
2693{
2694 proc_net_remove("if_inet6");
2695}
2696#endif /* CONFIG_PROC_FS */
2697
2698/*
2699 * Periodic address status verification
2700 */
2701
2702static void addrconf_verify(unsigned long foo)
2703{
2704 struct inet6_ifaddr *ifp;
2705 unsigned long now, next;
2706 int i;
2707
2708 spin_lock_bh(&addrconf_verify_lock);
2709 now = jiffies;
2710 next = now + ADDR_CHECK_FREQUENCY;
2711
2712 del_timer(&addr_chk_timer);
2713
2714 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2715
2716restart:
5d5780df 2717 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2718 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2719 unsigned long age;
2720#ifdef CONFIG_IPV6_PRIVACY
2721 unsigned long regen_advance;
2722#endif
2723
2724 if (ifp->flags & IFA_F_PERMANENT)
2725 continue;
2726
2727 spin_lock(&ifp->lock);
2728 age = (now - ifp->tstamp) / HZ;
2729
2730#ifdef CONFIG_IPV6_PRIVACY
2731 regen_advance = ifp->idev->cnf.regen_max_retry *
2732 ifp->idev->cnf.dad_transmits *
2733 ifp->idev->nd_parms->retrans_time / HZ;
2734#endif
2735
2736 if (age >= ifp->valid_lft) {
2737 spin_unlock(&ifp->lock);
2738 in6_ifa_hold(ifp);
5d5780df 2739 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2740 ipv6_del_addr(ifp);
2741 goto restart;
2742 } else if (age >= ifp->prefered_lft) {
2743 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2744 int deprecate = 0;
2745
2746 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2747 deprecate = 1;
2748 ifp->flags |= IFA_F_DEPRECATED;
2749 }
2750
2751 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2752 next = ifp->tstamp + ifp->valid_lft * HZ;
2753
2754 spin_unlock(&ifp->lock);
2755
2756 if (deprecate) {
2757 in6_ifa_hold(ifp);
5d5780df 2758 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2759
2760 ipv6_ifa_notify(0, ifp);
2761 in6_ifa_put(ifp);
2762 goto restart;
2763 }
2764#ifdef CONFIG_IPV6_PRIVACY
2765 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2766 !(ifp->flags&IFA_F_TENTATIVE)) {
2767 if (age >= ifp->prefered_lft - regen_advance) {
2768 struct inet6_ifaddr *ifpub = ifp->ifpub;
2769 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2770 next = ifp->tstamp + ifp->prefered_lft * HZ;
2771 if (!ifp->regen_count && ifpub) {
2772 ifp->regen_count++;
2773 in6_ifa_hold(ifp);
2774 in6_ifa_hold(ifpub);
2775 spin_unlock(&ifp->lock);
5d5780df 2776 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2777 ipv6_create_tempaddr(ifpub, ifp);
2778 in6_ifa_put(ifpub);
2779 in6_ifa_put(ifp);
2780 goto restart;
2781 }
2782 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2783 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2784 spin_unlock(&ifp->lock);
2785#endif
2786 } else {
2787 /* ifp->prefered_lft <= ifp->valid_lft */
2788 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2789 next = ifp->tstamp + ifp->prefered_lft * HZ;
2790 spin_unlock(&ifp->lock);
2791 }
2792 }
5d5780df 2793 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2794 }
2795
2796 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2797 add_timer(&addr_chk_timer);
2798 spin_unlock_bh(&addrconf_verify_lock);
2799}
2800
2801static int
2802inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2803{
2804 struct rtattr **rta = arg;
2805 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2806 struct in6_addr *pfx;
2807
2808 pfx = NULL;
2809 if (rta[IFA_ADDRESS-1]) {
2810 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2811 return -EINVAL;
2812 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2813 }
2814 if (rta[IFA_LOCAL-1]) {
2815 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2816 return -EINVAL;
2817 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2818 }
2819 if (pfx == NULL)
2820 return -EINVAL;
2821
2822 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2823}
2824
2825static int
2826inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2827{
2828 struct rtattr **rta = arg;
2829 struct ifaddrmsg *ifm = NLMSG_DATA(nlh);
2830 struct in6_addr *pfx;
2831
2832 pfx = NULL;
2833 if (rta[IFA_ADDRESS-1]) {
2834 if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx))
2835 return -EINVAL;
2836 pfx = RTA_DATA(rta[IFA_ADDRESS-1]);
2837 }
2838 if (rta[IFA_LOCAL-1]) {
2839 if (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))
2840 return -EINVAL;
2841 pfx = RTA_DATA(rta[IFA_LOCAL-1]);
2842 }
2843 if (pfx == NULL)
2844 return -EINVAL;
2845
2846 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2847}
2848
2849static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 2850 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 2851{
2852 struct ifaddrmsg *ifm;
2853 struct nlmsghdr *nlh;
2854 struct ifa_cacheinfo ci;
2855 unsigned char *b = skb->tail;
2856
b6544c0b 2857 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2858 ifm = NLMSG_DATA(nlh);
2859 ifm->ifa_family = AF_INET6;
2860 ifm->ifa_prefixlen = ifa->prefix_len;
2861 ifm->ifa_flags = ifa->flags;
2862 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2863 if (ifa->scope&IFA_HOST)
2864 ifm->ifa_scope = RT_SCOPE_HOST;
2865 else if (ifa->scope&IFA_LINK)
2866 ifm->ifa_scope = RT_SCOPE_LINK;
2867 else if (ifa->scope&IFA_SITE)
2868 ifm->ifa_scope = RT_SCOPE_SITE;
2869 ifm->ifa_index = ifa->idev->dev->ifindex;
2870 RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr);
2871 if (!(ifa->flags&IFA_F_PERMANENT)) {
2872 ci.ifa_prefered = ifa->prefered_lft;
2873 ci.ifa_valid = ifa->valid_lft;
2874 if (ci.ifa_prefered != INFINITY_LIFE_TIME) {
2875 long tval = (jiffies - ifa->tstamp)/HZ;
2876 ci.ifa_prefered -= tval;
2877 if (ci.ifa_valid != INFINITY_LIFE_TIME)
2878 ci.ifa_valid -= tval;
2879 }
2880 } else {
2881 ci.ifa_prefered = INFINITY_LIFE_TIME;
2882 ci.ifa_valid = INFINITY_LIFE_TIME;
2883 }
2884 ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100
2885 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2886 ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100
2887 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
2888 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2889 nlh->nlmsg_len = skb->tail - b;
2890 return skb->len;
2891
2892nlmsg_failure:
2893rtattr_failure:
2894 skb_trim(skb, b - skb->data);
2895 return -1;
2896}
2897
2898static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 2899 u32 pid, u32 seq, int event, u16 flags)
1da177e4
LT		 2900{
2901 struct ifaddrmsg *ifm;
2902 struct nlmsghdr *nlh;
2903 struct ifa_cacheinfo ci;
2904 unsigned char *b = skb->tail;
2905
b6544c0b 2906 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2907 ifm = NLMSG_DATA(nlh);
2908 ifm->ifa_family = AF_INET6;
2909 ifm->ifa_prefixlen = 128;
2910 ifm->ifa_flags = IFA_F_PERMANENT;
2911 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2912 if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE)
2913 ifm->ifa_scope = RT_SCOPE_SITE;
2914 ifm->ifa_index = ifmca->idev->dev->ifindex;
2915 RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr);
2916 ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ
2917 * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ
2918 * 100 / HZ);
2919 ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ
2920 * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ
2921 * 100 / HZ);
2922 ci.ifa_prefered = INFINITY_LIFE_TIME;
2923 ci.ifa_valid = INFINITY_LIFE_TIME;
2924 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2925 nlh->nlmsg_len = skb->tail - b;
2926 return skb->len;
2927
2928nlmsg_failure:
2929rtattr_failure:
2930 skb_trim(skb, b - skb->data);
2931 return -1;
2932}
2933
2934static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 2935 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 2936{
2937 struct ifaddrmsg *ifm;
2938 struct nlmsghdr *nlh;
2939 struct ifa_cacheinfo ci;
2940 unsigned char *b = skb->tail;
2941
b6544c0b 2942 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags);
1da177e4
LT		 2943 ifm = NLMSG_DATA(nlh);
2944 ifm->ifa_family = AF_INET6;
2945 ifm->ifa_prefixlen = 128;
2946 ifm->ifa_flags = IFA_F_PERMANENT;
2947 ifm->ifa_scope = RT_SCOPE_UNIVERSE;
2948 if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE)
2949 ifm->ifa_scope = RT_SCOPE_SITE;
2950 ifm->ifa_index = ifaca->aca_idev->dev->ifindex;
2951 RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr);
2952 ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ
2953 * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ
2954 * 100 / HZ);
2955 ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ
2956 * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ
2957 * 100 / HZ);
2958 ci.ifa_prefered = INFINITY_LIFE_TIME;
2959 ci.ifa_valid = INFINITY_LIFE_TIME;
2960 RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci);
2961 nlh->nlmsg_len = skb->tail - b;
2962 return skb->len;
2963
2964nlmsg_failure:
2965rtattr_failure:
2966 skb_trim(skb, b - skb->data);
2967 return -1;
2968}
2969
2970enum addr_type_t
2971{
2972 UNICAST_ADDR,
2973 MULTICAST_ADDR,
2974 ANYCAST_ADDR,
2975};
2976
2977static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
2978 enum addr_type_t type)
2979{
2980 int idx, ip_idx;
2981 int s_idx, s_ip_idx;
2982 int err = 1;
2983 struct net_device *dev;
2984 struct inet6_dev *idev = NULL;
2985 struct inet6_ifaddr *ifa;
2986 struct ifmcaddr6 *ifmca;
2987 struct ifacaddr6 *ifaca;
2988
2989 s_idx = cb->args[0];
2990 s_ip_idx = ip_idx = cb->args[1];
2991 read_lock(&dev_base_lock);
2992
2993 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
2994 if (idx < s_idx)
2995 continue;
2996 if (idx > s_idx)
2997 s_ip_idx = 0;
2998 ip_idx = 0;
2999 if ((idev = in6_dev_get(dev)) == NULL)
3000 continue;
3001 read_lock_bh(&idev->lock);
3002 switch (type) {
3003 case UNICAST_ADDR:
ae9cda5d 3004 /* unicast address incl. temp addr */
1da177e4
LT		 3005 for (ifa = idev->addr_list; ifa;
3006 ifa = ifa->if_next, ip_idx++) {
3007 if (ip_idx < s_ip_idx)
3008 continue;
3009 if ((err = inet6_fill_ifaddr(skb, ifa,
3010 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3011 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3012 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3013 goto done;
3014 }
1da177e4
LT		 3015 break;
3016 case MULTICAST_ADDR:
3017 /* multicast address */
3018 for (ifmca = idev->mc_list; ifmca;
3019 ifmca = ifmca->next, ip_idx++) {
3020 if (ip_idx < s_ip_idx)
3021 continue;
3022 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3023 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3024 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3025 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3026 goto done;
3027 }
3028 break;
3029 case ANYCAST_ADDR:
3030 /* anycast address */
3031 for (ifaca = idev->ac_list; ifaca;
3032 ifaca = ifaca->aca_next, ip_idx++) {
3033 if (ip_idx < s_ip_idx)
3034 continue;
3035 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3036 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3037 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3038 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3039 goto done;
3040 }
3041 break;
3042 default:
3043 break;
3044 }
3045 read_unlock_bh(&idev->lock);
3046 in6_dev_put(idev);
3047 }
3048done:
3049 if (err <= 0) {
3050 read_unlock_bh(&idev->lock);
3051 in6_dev_put(idev);
3052 }
3053 read_unlock(&dev_base_lock);
3054 cb->args[0] = idx;
3055 cb->args[1] = ip_idx;
3056 return skb->len;
3057}
3058
3059static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3060{
3061 enum addr_type_t type = UNICAST_ADDR;
3062 return inet6_dump_addr(skb, cb, type);
3063}
3064
3065static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3066{
3067 enum addr_type_t type = MULTICAST_ADDR;
3068 return inet6_dump_addr(skb, cb, type);
3069}
3070
3071
3072static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3073{
3074 enum addr_type_t type = ANYCAST_ADDR;
3075 return inet6_dump_addr(skb, cb, type);
3076}
3077
3078static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3079{
3080 struct sk_buff *skb;
3081 int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
3082
3083 skb = alloc_skb(size, GFP_ATOMIC);
3084 if (!skb) {
ac6d439d 3085 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS);
1da177e4
LT		 3086 return;
3087 }
9ed19f33 3088 if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) {
1da177e4 3089 kfree_skb(skb);
ac6d439d 3090 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL);
1da177e4
LT		 3091 return;
3092 }
ac6d439d
PM		 3093 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR;
3094 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC);
1da177e4
LT		 3095}
3096
3097static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3098 __s32 *array, int bytes)
3099{
3100 memset(array, 0, bytes);
3101 array[DEVCONF_FORWARDING] = cnf->forwarding;
3102 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3103 array[DEVCONF_MTU6] = cnf->mtu6;
3104 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3105 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3106 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3107 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3108 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3109 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3110 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3111 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3112#ifdef CONFIG_IPV6_PRIVACY
3113 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3114 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3115 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3116 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3117 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3118#endif
3119 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3120}
3121
3122static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3123 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4
LT		 3124{
3125 struct net_device *dev = idev->dev;
3126 __s32 *array = NULL;
3127 struct ifinfomsg *r;
3128 struct nlmsghdr *nlh;
3129 unsigned char *b = skb->tail;
3130 struct rtattr *subattr;
3131 __u32 mtu = dev->mtu;
3132 struct ifla_cacheinfo ci;
3133
b6544c0b 3134 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
1da177e4
LT		 3135 r = NLMSG_DATA(nlh);
3136 r->ifi_family = AF_INET6;
9ef1d4c7 3137 r->__ifi_pad = 0;
1da177e4
LT		 3138 r->ifi_type = dev->type;
3139 r->ifi_index = dev->ifindex;
3140 r->ifi_flags = dev_get_flags(dev);
3141 r->ifi_change = 0;
3142
3143 RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
3144
3145 if (dev->addr_len)
3146 RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3147
3148 RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
3149 if (dev->ifindex != dev->iflink)
3150 RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
3151
3152 subattr = (struct rtattr*)skb->tail;
3153
3154 RTA_PUT(skb, IFLA_PROTINFO, 0, NULL);
3155
3156 /* return the device flags */
3157 RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags);
3158
3159 /* return interface cacheinfo */
3160 ci.max_reasm_len = IPV6_MAXPLEN;
3161 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3162 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3163 ci.reachable_time = idev->nd_parms->reachable_time;
3164 ci.retrans_time = idev->nd_parms->retrans_time;
3165 RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3166
3167 /* return the device sysctl params */
3168 if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL)
3169 goto rtattr_failure;
3170 ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array));
3171 RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array);
3172
3173 /* XXX - Statistics/MC not implemented */
3174 subattr->rta_len = skb->tail - (u8*)subattr;
3175
3176 nlh->nlmsg_len = skb->tail - b;
3177 kfree(array);
3178 return skb->len;
3179
3180nlmsg_failure:
3181rtattr_failure:
a51482bd 3182 kfree(array);
1da177e4
LT		 3183 skb_trim(skb, b - skb->data);
3184 return -1;
3185}
3186
3187static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3188{
3189 int idx, err;
3190 int s_idx = cb->args[0];
3191 struct net_device *dev;
3192 struct inet6_dev *idev;
3193
3194 read_lock(&dev_base_lock);
3195 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3196 if (idx < s_idx)
3197 continue;
3198 if ((idev = in6_dev_get(dev)) == NULL)
3199 continue;
3200 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3201 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3202 in6_dev_put(idev);
3203 if (err <= 0)
3204 break;
3205 }
3206 read_unlock(&dev_base_lock);
3207 cb->args[0] = idx;
3208
3209 return skb->len;
3210}
3211
3212void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3213{
3214 struct sk_buff *skb;
3215 /* 128 bytes ?? */
3216 int size = NLMSG_SPACE(sizeof(struct ifinfomsg)+128);
3217
3218 skb = alloc_skb(size, GFP_ATOMIC);
3219 if (!skb) {
ac6d439d 3220 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS);
1da177e4
LT		 3221 return;
3222 }
9ed19f33 3223 if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) {
1da177e4 3224 kfree_skb(skb);
ac6d439d 3225 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL);
1da177e4
LT		 3226 return;
3227 }
ac6d439d
PM		 3228 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO;
3229 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC);
1da177e4
LT		 3230}
3231
3232static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b
JHS		 3233 struct prefix_info *pinfo, u32 pid, u32 seq,
3234 int event, unsigned int flags)
1da177e4
LT		 3235{
3236 struct prefixmsg *pmsg;
3237 struct nlmsghdr *nlh;
3238 unsigned char *b = skb->tail;
3239 struct prefix_cacheinfo ci;
3240
b6544c0b 3241 nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags);
1da177e4
LT		 3242 pmsg = NLMSG_DATA(nlh);
3243 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3244 pmsg->prefix_pad1 = 0;
3245 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3246 pmsg->prefix_ifindex = idev->dev->ifindex;
3247 pmsg->prefix_len = pinfo->prefix_len;
3248 pmsg->prefix_type = pinfo->type;
8a47077a 3249 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3250
3251 pmsg->prefix_flags = 0;
3252 if (pinfo->onlink)
3253 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3254 if (pinfo->autoconf)
3255 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3256
3257 RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3258
3259 ci.preferred_time = ntohl(pinfo->prefered);
3260 ci.valid_time = ntohl(pinfo->valid);
3261 RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3262
3263 nlh->nlmsg_len = skb->tail - b;
3264 return skb->len;
3265
3266nlmsg_failure:
3267rtattr_failure:
3268 skb_trim(skb, b - skb->data);
3269 return -1;
3270}
3271
3272static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3273 struct prefix_info *pinfo)
3274{
3275 struct sk_buff *skb;
3276 int size = NLMSG_SPACE(sizeof(struct prefixmsg)+128);
3277
3278 skb = alloc_skb(size, GFP_ATOMIC);
3279 if (!skb) {
ac6d439d 3280 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS);
1da177e4
LT		 3281 return;
3282 }
9ed19f33 3283 if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) {
1da177e4 3284 kfree_skb(skb);
ac6d439d 3285 netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL);
1da177e4
LT		 3286 return;
3287 }
ac6d439d
PM		 3288 NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX;
3289 netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC);
1da177e4
LT		 3290}
3291
db46edc6 3292static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
1da177e4
LT		 3293 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3294 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3295 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
3296 [RTM_GETADDR - RTM_BASE] = { .dumpit = inet6_dump_ifaddr, },
3297 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3298 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3299 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3300 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3301 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3302 .dumpit = inet6_dump_fib, },
3303};
3304
3305static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3306{
3307 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3308
3309 switch (event) {
3310 case RTM_NEWADDR:
3311 dst_hold(&ifp->rt->u.dst);
0d51aa80 3312 if (ip6_ins_rt(ifp->rt, NULL, NULL, NULL))
1da177e4
LT		 3313 dst_release(&ifp->rt->u.dst);
3314 if (ifp->idev->cnf.forwarding)
3315 addrconf_join_anycast(ifp);
3316 break;
3317 case RTM_DELADDR:
3318 if (ifp->idev->cnf.forwarding)
3319 addrconf_leave_anycast(ifp);
3320 addrconf_leave_solict(ifp->idev, &ifp->addr);
3321 dst_hold(&ifp->rt->u.dst);
0d51aa80 3322 if (ip6_del_rt(ifp->rt, NULL, NULL, NULL))
1da177e4
LT		 3323 dst_free(&ifp->rt->u.dst);
3324 else
3325 dst_release(&ifp->rt->u.dst);
3326 break;
3327 }
3328}
3329
3330static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3331{
3332 read_lock_bh(&addrconf_lock);
3333 if (likely(ifp->idev->dead == 0))
3334 __ipv6_ifa_notify(event, ifp);
3335 read_unlock_bh(&addrconf_lock);
3336}
3337
3338#ifdef CONFIG_SYSCTL
3339
3340static
3341int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3342 void __user *buffer, size_t *lenp, loff_t *ppos)
3343{
3344 int *valp = ctl->data;
3345 int val = *valp;
3346 int ret;
3347
3348 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3349
3350 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3351 if (valp != &ipv6_devconf.forwarding) {
3352 if ((!*valp) ^ (!val)) {
3353 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3354 if (idev == NULL)
3355 return ret;
3356 dev_forward_change(idev);
3357 }
3358 } else {
3359 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3360 addrconf_forward_change();
3361 }
3362 if (*valp)
3363 rt6_purge_dflt_routers();
3364 }
3365
3366 return ret;
3367}
3368
3369static int addrconf_sysctl_forward_strategy(ctl_table *table,
3370 int __user *name, int nlen,
3371 void __user *oldval,
3372 size_t __user *oldlenp,
3373 void __user *newval, size_t newlen,
3374 void **context)
3375{
3376 int *valp = table->data;
3377 int new;
3378
3379 if (!newval || !newlen)
3380 return 0;
3381 if (newlen != sizeof(int))
3382 return -EINVAL;
3383 if (get_user(new, (int __user *)newval))
3384 return -EFAULT;
3385 if (new == *valp)
3386 return 0;
3387 if (oldval && oldlenp) {
3388 size_t len;
3389 if (get_user(len, oldlenp))
3390 return -EFAULT;
3391 if (len) {
3392 if (len > table->maxlen)
3393 len = table->maxlen;
3394 if (copy_to_user(oldval, valp, len))
3395 return -EFAULT;
3396 if (put_user(len, oldlenp))
3397 return -EFAULT;
3398 }
3399 }
3400
3401 if (valp != &ipv6_devconf_dflt.forwarding) {
3402 if (valp != &ipv6_devconf.forwarding) {
3403 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3404 int changed;
3405 if (unlikely(idev == NULL))
3406 return -ENODEV;
3407 changed = (!*valp) ^ (!new);
3408 *valp = new;
3409 if (changed)
3410 dev_forward_change(idev);
3411 } else {
3412 *valp = new;
3413 addrconf_forward_change();
3414 }
3415
3416 if (*valp)
3417 rt6_purge_dflt_routers();
3418 } else
3419 *valp = new;
3420
3421 return 1;
3422}
3423
3424static struct addrconf_sysctl_table
3425{
3426 struct ctl_table_header *sysctl_header;
3427 ctl_table addrconf_vars[__NET_IPV6_MAX];
3428 ctl_table addrconf_dev[2];
3429 ctl_table addrconf_conf_dir[2];
3430 ctl_table addrconf_proto_dir[2];
3431 ctl_table addrconf_root_dir[2];
3432} addrconf_sysctl = {
3433 .sysctl_header = NULL,
3434 .addrconf_vars = {
3435 {
3436 .ctl_name = NET_IPV6_FORWARDING,
3437 .procname = "forwarding",
3438 .data = &ipv6_devconf.forwarding,
3439 .maxlen = sizeof(int),
3440 .mode = 0644,
3441 .proc_handler = &addrconf_sysctl_forward,
3442 .strategy = &addrconf_sysctl_forward_strategy,
3443 },
3444 {
3445 .ctl_name = NET_IPV6_HOP_LIMIT,
3446 .procname = "hop_limit",
3447 .data = &ipv6_devconf.hop_limit,
3448 .maxlen = sizeof(int),
3449 .mode = 0644,
3450 .proc_handler = proc_dointvec,
3451 },
3452 {
3453 .ctl_name = NET_IPV6_MTU,
3454 .procname = "mtu",
3455 .data = &ipv6_devconf.mtu6,
3456 .maxlen = sizeof(int),
3457 .mode = 0644,
3458 .proc_handler = &proc_dointvec,
3459 },
3460 {
3461 .ctl_name = NET_IPV6_ACCEPT_RA,
3462 .procname = "accept_ra",
3463 .data = &ipv6_devconf.accept_ra,
3464 .maxlen = sizeof(int),
3465 .mode = 0644,
3466 .proc_handler = &proc_dointvec,
3467 },
3468 {
3469 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3470 .procname = "accept_redirects",
3471 .data = &ipv6_devconf.accept_redirects,
3472 .maxlen = sizeof(int),
3473 .mode = 0644,
3474 .proc_handler = &proc_dointvec,
3475 },
3476 {
3477 .ctl_name = NET_IPV6_AUTOCONF,
3478 .procname = "autoconf",
3479 .data = &ipv6_devconf.autoconf,
3480 .maxlen = sizeof(int),
3481 .mode = 0644,
3482 .proc_handler = &proc_dointvec,
3483 },
3484 {
3485 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3486 .procname = "dad_transmits",
3487 .data = &ipv6_devconf.dad_transmits,
3488 .maxlen = sizeof(int),
3489 .mode = 0644,
3490 .proc_handler = &proc_dointvec,
3491 },
3492 {
3493 .ctl_name = NET_IPV6_RTR_SOLICITS,
3494 .procname = "router_solicitations",
3495 .data = &ipv6_devconf.rtr_solicits,
3496 .maxlen = sizeof(int),
3497 .mode = 0644,
3498 .proc_handler = &proc_dointvec,
3499 },
3500 {
3501 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3502 .procname = "router_solicitation_interval",
3503 .data = &ipv6_devconf.rtr_solicit_interval,
3504 .maxlen = sizeof(int),
3505 .mode = 0644,
3506 .proc_handler = &proc_dointvec_jiffies,
3507 .strategy = &sysctl_jiffies,
3508 },
3509 {
3510 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3511 .procname = "router_solicitation_delay",
3512 .data = &ipv6_devconf.rtr_solicit_delay,
3513 .maxlen = sizeof(int),
3514 .mode = 0644,
3515 .proc_handler = &proc_dointvec_jiffies,
3516 .strategy = &sysctl_jiffies,
3517 },
3518 {
3519 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3520 .procname = "force_mld_version",
3521 .data = &ipv6_devconf.force_mld_version,
3522 .maxlen = sizeof(int),
3523 .mode = 0644,
3524 .proc_handler = &proc_dointvec,
3525 },
3526#ifdef CONFIG_IPV6_PRIVACY
3527 {
3528 .ctl_name = NET_IPV6_USE_TEMPADDR,
3529 .procname = "use_tempaddr",
3530 .data = &ipv6_devconf.use_tempaddr,
3531 .maxlen = sizeof(int),
3532 .mode = 0644,
3533 .proc_handler = &proc_dointvec,
3534 },
3535 {
3536 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3537 .procname = "temp_valid_lft",
3538 .data = &ipv6_devconf.temp_valid_lft,
3539 .maxlen = sizeof(int),
3540 .mode = 0644,
3541 .proc_handler = &proc_dointvec,
3542 },
3543 {
3544 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3545 .procname = "temp_prefered_lft",
3546 .data = &ipv6_devconf.temp_prefered_lft,
3547 .maxlen = sizeof(int),
3548 .mode = 0644,
3549 .proc_handler = &proc_dointvec,
3550 },
3551 {
3552 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3553 .procname = "regen_max_retry",
3554 .data = &ipv6_devconf.regen_max_retry,
3555 .maxlen = sizeof(int),
3556 .mode = 0644,
3557 .proc_handler = &proc_dointvec,
3558 },
3559 {
3560 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3561 .procname = "max_desync_factor",
3562 .data = &ipv6_devconf.max_desync_factor,
3563 .maxlen = sizeof(int),
3564 .mode = 0644,
3565 .proc_handler = &proc_dointvec,
3566 },
3567#endif
3568 {
3569 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3570 .procname = "max_addresses",
3571 .data = &ipv6_devconf.max_addresses,
3572 .maxlen = sizeof(int),
3573 .mode = 0644,
3574 .proc_handler = &proc_dointvec,
3575 },
3576 {
3577 .ctl_name = 0, /* sentinel */
3578 }
3579 },
3580 .addrconf_dev = {
3581 {
3582 .ctl_name = NET_PROTO_CONF_ALL,
3583 .procname = "all",
3584 .mode = 0555,
3585 .child = addrconf_sysctl.addrconf_vars,
3586 },
3587 {
3588 .ctl_name = 0, /* sentinel */
3589 }
3590 },
3591 .addrconf_conf_dir = {
3592 {
3593 .ctl_name = NET_IPV6_CONF,
3594 .procname = "conf",
3595 .mode = 0555,
3596 .child = addrconf_sysctl.addrconf_dev,
3597 },
3598 {
3599 .ctl_name = 0, /* sentinel */
3600 }
3601 },
3602 .addrconf_proto_dir = {
3603 {
3604 .ctl_name = NET_IPV6,
3605 .procname = "ipv6",
3606 .mode = 0555,
3607 .child = addrconf_sysctl.addrconf_conf_dir,
3608 },
3609 {
3610 .ctl_name = 0, /* sentinel */
3611 }
3612 },
3613 .addrconf_root_dir = {
3614 {
3615 .ctl_name = CTL_NET,
3616 .procname = "net",
3617 .mode = 0555,
3618 .child = addrconf_sysctl.addrconf_proto_dir,
3619 },
3620 {
3621 .ctl_name = 0, /* sentinel */
3622 }
3623 },
3624};
3625
3626static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3627{
3628 int i;
3629 struct net_device *dev = idev ? idev->dev : NULL;
3630 struct addrconf_sysctl_table *t;
3631 char *dev_name = NULL;
3632
3633 t = kmalloc(sizeof(*t), GFP_KERNEL);
3634 if (t == NULL)
3635 return;
3636 memcpy(t, &addrconf_sysctl, sizeof(*t));
3637 for (i=0; t->addrconf_vars[i].data; i++) {
3638 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
3639 t->addrconf_vars[i].de = NULL;
3640 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3641 }
3642 if (dev) {
3643 dev_name = dev->name;
3644 t->addrconf_dev[0].ctl_name = dev->ifindex;
3645 } else {
3646 dev_name = "default";
3647 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3648 }
3649
3650 /*
3651 * Make a copy of dev_name, because '.procname' is regarded as const
3652 * by sysctl and we wouldn't want anyone to change it under our feet
3653 * (see SIOCSIFNAME).
3654 */
543537bd 3655 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 3656 if (!dev_name)
3657 goto free;
3658
3659 t->addrconf_dev[0].procname = dev_name;
3660
3661 t->addrconf_dev[0].child = t->addrconf_vars;
3662 t->addrconf_dev[0].de = NULL;
3663 t->addrconf_conf_dir[0].child = t->addrconf_dev;
3664 t->addrconf_conf_dir[0].de = NULL;
3665 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
3666 t->addrconf_proto_dir[0].de = NULL;
3667 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
3668 t->addrconf_root_dir[0].de = NULL;
3669
3670 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0);
3671 if (t->sysctl_header == NULL)
3672 goto free_procname;
3673 else
3674 p->sysctl = t;
3675 return;
3676
3677 /* error path */
3678 free_procname:
3679 kfree(dev_name);
3680 free:
3681 kfree(t);
3682
3683 return;
3684}
3685
3686static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3687{
3688 if (p->sysctl) {
3689 struct addrconf_sysctl_table *t = p->sysctl;
3690 p->sysctl = NULL;
3691 unregister_sysctl_table(t->sysctl_header);
3692 kfree(t->addrconf_dev[0].procname);
3693 kfree(t);
3694 }
3695}
3696
3697
3698#endif
3699
3700/*
3701 * Device notifier
3702 */
3703
3704int register_inet6addr_notifier(struct notifier_block *nb)
3705{
3706 return notifier_chain_register(&inet6addr_chain, nb);
3707}
3708
3709int unregister_inet6addr_notifier(struct notifier_block *nb)
3710{
3711 return notifier_chain_unregister(&inet6addr_chain,nb);
3712}
3713
3714/*
3715 * Init / cleanup code
3716 */
3717
3718int __init addrconf_init(void)
3719{
3720 int err = 0;
3721
3722 /* The addrconf netdev notifier requires that loopback_dev
3723 * has it's ipv6 private information allocated and setup
3724 * before it can bring up and give link-local addresses
3725 * to other devices which are up.
3726 *
3727 * Unfortunately, loopback_dev is not necessarily the first
3728 * entry in the global dev_base list of net devices. In fact,
3729 * it is likely to be the very last entry on that list.
3730 * So this causes the notifier registry below to try and
3731 * give link-local addresses to all devices besides loopback_dev
3732 * first, then loopback_dev, which cases all the non-loopback_dev
3733 * devices to fail to get a link-local address.
3734 *
3735 * So, as a temporary fix, allocate the ipv6 structure for
3736 * loopback_dev first by hand.
3737 * Longer term, all of the dependencies ipv6 has upon the loopback
3738 * device and it being up should be removed.
3739 */
3740 rtnl_lock();
3741 if (!ipv6_add_dev(&loopback_dev))
3742 err = -ENOMEM;
3743 rtnl_unlock();
3744 if (err)
3745 return err;
3746
c62dba90
HX		 3747 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
3748
1da177e4
LT		 3749 register_netdevice_notifier(&ipv6_dev_notf);
3750
3751#ifdef CONFIG_IPV6_PRIVACY
3752 md5_tfm = crypto_alloc_tfm("md5", 0);
3753 if (unlikely(md5_tfm == NULL))
3754 printk(KERN_WARNING
3755 "failed to load transform for md5\n");
3756#endif
3757
3758 addrconf_verify(0);
3759 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
3760#ifdef CONFIG_SYSCTL
3761 addrconf_sysctl.sysctl_header =
3762 register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0);
3763 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
3764#endif
3765
3766 return 0;
3767}
3768
3769void __exit addrconf_cleanup(void)
3770{
3771 struct net_device *dev;
3772 struct inet6_dev *idev;
3773 struct inet6_ifaddr *ifa;
3774 int i;
3775
3776 unregister_netdevice_notifier(&ipv6_dev_notf);
3777
3778 rtnetlink_links[PF_INET6] = NULL;
3779#ifdef CONFIG_SYSCTL
3780 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
3781 addrconf_sysctl_unregister(&ipv6_devconf);
3782#endif
3783
3784 rtnl_lock();
3785
3786 /*
3787 * clean dev list.
3788 */
3789
3790 for (dev=dev_base; dev; dev=dev->next) {
3791 if ((idev = __in6_dev_get(dev)) == NULL)
3792 continue;
3793 addrconf_ifdown(dev, 1);
3794 }
3795 addrconf_ifdown(&loopback_dev, 2);
3796
3797 /*
3798 * Check hash table.
3799 */
3800
3801 write_lock_bh(&addrconf_hash_lock);
3802 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3803 for (ifa=inet6_addr_lst[i]; ifa; ) {
3804 struct inet6_ifaddr *bifa;
3805
3806 bifa = ifa;
3807 ifa = ifa->lst_next;
3808 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
3809 /* Do not free it; something is wrong.
3810 Now we can investigate it with debugger.
3811 */
3812 }
3813 }
3814 write_unlock_bh(&addrconf_hash_lock);
3815
3816 del_timer(&addr_chk_timer);
3817
3818 rtnl_unlock();
3819
3820#ifdef CONFIG_IPV6_PRIVACY
573dbd95
JJ		 3821 crypto_free_tfm(md5_tfm);
3822 md5_tfm = NULL;
1da177e4
LT		 3823#endif
3824
3825#ifdef CONFIG_PROC_FS
3826 proc_net_remove("if_inet6");
3827#endif
3828}
Clone of davem's net-next-2.6 tree