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[IPV6] IP6TUNNEL: Use update_pmtu() of dst on xmit.
[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:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 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
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 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>
5d620266 75#include <net/netlink.h>
1da177e4
LT		 76#include <linux/if_tunnel.h>
77#include <linux/rtnetlink.h>
78
79#ifdef CONFIG_IPV6_PRIVACY
80#include <linux/random.h>
1da177e4
LT		 81#endif
82
83#include <asm/uaccess.h>
84
85#include <linux/proc_fs.h>
86#include <linux/seq_file.h>
87
88/* Set to 3 to get tracing... */
89#define ACONF_DEBUG 2
90
91#if ACONF_DEBUG >= 3
92#define ADBG(x) printk x
93#else
94#define ADBG(x)
95#endif
96
97#define INFINITY_LIFE_TIME 0xFFFFFFFF
98#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100#ifdef CONFIG_SYSCTL
101static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103#endif
104
105#ifdef CONFIG_IPV6_PRIVACY
106static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 107static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 108static void ipv6_regen_rndid(unsigned long data);
109
110static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 111#endif
112
113static int ipv6_count_addresses(struct inet6_dev *idev);
114
115/*
116 * Configured unicast address hash table
117 */
118static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119static DEFINE_RWLOCK(addrconf_hash_lock);
120
1da177e4
LT		 121static void addrconf_verify(unsigned long);
122
8d06afab 123static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 124static DEFINE_SPINLOCK(addrconf_verify_lock);
125
126static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
127static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
128
129static int addrconf_ifdown(struct net_device *dev, int how);
130
e431b8c0 131static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 132static void addrconf_dad_timer(unsigned long data);
133static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 134static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 135static void addrconf_rs_timer(unsigned long data);
136static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
137static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138
1ab1457c 139static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 140 struct prefix_info *pinfo);
141static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
142
e041c683 143static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 144
ab32ea5d 145struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 146 .forwarding = 0,
147 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
148 .mtu6 = IPV6_MIN_MTU,
149 .accept_ra = 1,
150 .accept_redirects = 1,
151 .autoconf = 1,
152 .force_mld_version = 0,
153 .dad_transmits = 1,
154 .rtr_solicits = MAX_RTR_SOLICITATIONS,
155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
157#ifdef CONFIG_IPV6_PRIVACY
158 .use_tempaddr = 0,
159 .temp_valid_lft = TEMP_VALID_LIFETIME,
160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
161 .regen_max_retry = REGEN_MAX_RETRY,
162 .max_desync_factor = MAX_DESYNC_FACTOR,
163#endif
164 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 165 .accept_ra_defrtr = 1,
c4fd30eb 166 .accept_ra_pinfo = 1,
930d6ff2
YH		 167#ifdef CONFIG_IPV6_ROUTER_PREF
168 .accept_ra_rtr_pref = 1,
52e16356 169 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 170#ifdef CONFIG_IPV6_ROUTE_INFO
171 .accept_ra_rt_info_max_plen = 0,
172#endif
930d6ff2 173#endif
fbea49e1 174 .proxy_ndp = 0,
1da177e4
LT		 175};
176
ab32ea5d 177static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .dad_transmits = 1,
185 .rtr_solicits = MAX_RTR_SOLICITATIONS,
186 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
187 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
188#ifdef CONFIG_IPV6_PRIVACY
189 .use_tempaddr = 0,
190 .temp_valid_lft = TEMP_VALID_LIFETIME,
191 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
192 .regen_max_retry = REGEN_MAX_RETRY,
193 .max_desync_factor = MAX_DESYNC_FACTOR,
194#endif
195 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 196 .accept_ra_defrtr = 1,
c4fd30eb 197 .accept_ra_pinfo = 1,
930d6ff2
YH		 198#ifdef CONFIG_IPV6_ROUTER_PREF
199 .accept_ra_rtr_pref = 1,
52e16356 200 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 201#ifdef CONFIG_IPV6_ROUTE_INFO
202 .accept_ra_rt_info_max_plen = 0,
203#endif
930d6ff2 204#endif
fbea49e1 205 .proxy_ndp = 0,
1da177e4
LT		 206};
207
208/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
209#if 0
210const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
211#endif
212const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
213
1da177e4
LT		 214static void addrconf_del_timer(struct inet6_ifaddr *ifp)
215{
216 if (del_timer(&ifp->timer))
217 __in6_ifa_put(ifp);
218}
219
220enum addrconf_timer_t
221{
222 AC_NONE,
223 AC_DAD,
224 AC_RS,
225};
226
227static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
228 enum addrconf_timer_t what,
229 unsigned long when)
230{
231 if (!del_timer(&ifp->timer))
232 in6_ifa_hold(ifp);
233
234 switch (what) {
235 case AC_DAD:
236 ifp->timer.function = addrconf_dad_timer;
237 break;
238 case AC_RS:
239 ifp->timer.function = addrconf_rs_timer;
240 break;
241 default:;
242 }
243 ifp->timer.expires = jiffies + when;
244 add_timer(&ifp->timer);
245}
246
247/* Nobody refers to this device, we may destroy it. */
248
8814c4b5
YH		 249static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
250{
251 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
252 kfree(idev);
253}
254
1da177e4
LT		 255void in6_dev_finish_destroy(struct inet6_dev *idev)
256{
257 struct net_device *dev = idev->dev;
258 BUG_TRAP(idev->addr_list==NULL);
259 BUG_TRAP(idev->mc_list==NULL);
260#ifdef NET_REFCNT_DEBUG
261 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
262#endif
263 dev_put(dev);
264 if (!idev->dead) {
265 printk("Freeing alive inet6 device %p\n", idev);
266 return;
267 }
268 snmp6_free_dev(idev);
8814c4b5 269 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 270}
271
272static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
273{
274 struct inet6_dev *ndev;
d88ae4cc 275 struct in6_addr maddr;
1da177e4
LT		 276
277 ASSERT_RTNL();
278
279 if (dev->mtu < IPV6_MIN_MTU)
280 return NULL;
281
1ab1457c 282 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 283
1ab1457c
YH		 284 if (ndev == NULL)
285 return NULL;
322f74a4
IO		 286
287 rwlock_init(&ndev->lock);
288 ndev->dev = dev;
289 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
290 ndev->cnf.mtu6 = dev->mtu;
291 ndev->cnf.sysctl = NULL;
292 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
293 if (ndev->nd_parms == NULL) {
294 kfree(ndev);
295 return NULL;
296 }
297 /* We refer to the device */
298 dev_hold(dev);
1da177e4 299
322f74a4
IO		 300 if (snmp6_alloc_dev(ndev) < 0) {
301 ADBG((KERN_WARNING
302 "%s(): cannot allocate memory for statistics; dev=%s.\n",
303 __FUNCTION__, dev->name));
304 neigh_parms_release(&nd_tbl, ndev->nd_parms);
305 ndev->dead = 1;
306 in6_dev_finish_destroy(ndev);
307 return NULL;
308 }
1da177e4 309
322f74a4
IO		 310 if (snmp6_register_dev(ndev) < 0) {
311 ADBG((KERN_WARNING
312 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
313 __FUNCTION__, dev->name));
314 neigh_parms_release(&nd_tbl, ndev->nd_parms);
315 ndev->dead = 1;
316 in6_dev_finish_destroy(ndev);
317 return NULL;
318 }
319
320 /* One reference from device. We must do this before
321 * we invoke __ipv6_regen_rndid().
322 */
323 in6_dev_hold(ndev);
1da177e4
LT		 324
325#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 326 init_timer(&ndev->regen_timer);
327 ndev->regen_timer.function = ipv6_regen_rndid;
328 ndev->regen_timer.data = (unsigned long) ndev;
329 if ((dev->flags&IFF_LOOPBACK) ||
330 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 331#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
332 dev->type == ARPHRD_SIT ||
333#endif
334 dev->type == ARPHRD_NONE) {
322f74a4
IO		 335 printk(KERN_INFO
336 "%s: Disabled Privacy Extensions\n",
337 dev->name);
338 ndev->cnf.use_tempaddr = -1;
339 } else {
340 in6_dev_hold(ndev);
341 ipv6_regen_rndid((unsigned long) ndev);
342 }
1da177e4
LT		 343#endif
344
322f74a4
IO		 345 if (netif_carrier_ok(dev))
346 ndev->if_flags |= IF_READY;
3c21edbd 347
1da177e4 348
322f74a4
IO		 349 ipv6_mc_init_dev(ndev);
350 ndev->tstamp = jiffies;
1da177e4 351#ifdef CONFIG_SYSCTL
322f74a4
IO		 352 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
353 NET_IPV6_NEIGH, "ipv6",
354 &ndisc_ifinfo_sysctl_change,
355 NULL);
356 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 357#endif
30c4cf57
DS		 358 /* protected by rtnl_lock */
359 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 360
361 /* Join all-node multicast group */
362 ipv6_addr_all_nodes(&maddr);
363 ipv6_dev_mc_inc(dev, &maddr);
364
1da177e4
LT		 365 return ndev;
366}
367
368static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
369{
370 struct inet6_dev *idev;
371
372 ASSERT_RTNL();
373
374 if ((idev = __in6_dev_get(dev)) == NULL) {
375 if ((idev = ipv6_add_dev(dev)) == NULL)
376 return NULL;
377 }
c5e33bdd 378
1da177e4
LT		 379 if (dev->flags&IFF_UP)
380 ipv6_mc_up(idev);
381 return idev;
382}
383
384#ifdef CONFIG_SYSCTL
385static void dev_forward_change(struct inet6_dev *idev)
386{
387 struct net_device *dev;
388 struct inet6_ifaddr *ifa;
389 struct in6_addr addr;
390
391 if (!idev)
392 return;
393 dev = idev->dev;
394 if (dev && (dev->flags & IFF_MULTICAST)) {
395 ipv6_addr_all_routers(&addr);
1ab1457c 396
1da177e4
LT		 397 if (idev->cnf.forwarding)
398 ipv6_dev_mc_inc(dev, &addr);
399 else
400 ipv6_dev_mc_dec(dev, &addr);
401 }
402 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
403 if (idev->cnf.forwarding)
404 addrconf_join_anycast(ifa);
405 else
406 addrconf_leave_anycast(ifa);
407 }
408}
409
410
411static void addrconf_forward_change(void)
412{
413 struct net_device *dev;
414 struct inet6_dev *idev;
415
416 read_lock(&dev_base_lock);
417 for (dev=dev_base; dev; dev=dev->next) {
8814c4b5 418 rcu_read_lock();
1da177e4
LT		 419 idev = __in6_dev_get(dev);
420 if (idev) {
421 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
422 idev->cnf.forwarding = ipv6_devconf.forwarding;
423 if (changed)
424 dev_forward_change(idev);
425 }
8814c4b5 426 rcu_read_unlock();
1da177e4
LT		 427 }
428 read_unlock(&dev_base_lock);
429}
430#endif
431
432/* Nobody refers to this ifaddr, destroy it */
433
434void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
435{
436 BUG_TRAP(ifp->if_next==NULL);
437 BUG_TRAP(ifp->lst_next==NULL);
438#ifdef NET_REFCNT_DEBUG
439 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
440#endif
441
442 in6_dev_put(ifp->idev);
443
444 if (del_timer(&ifp->timer))
445 printk("Timer is still running, when freeing ifa=%p\n", ifp);
446
447 if (!ifp->dead) {
448 printk("Freeing alive inet6 address %p\n", ifp);
449 return;
450 }
451 dst_release(&ifp->rt->u.dst);
452
453 kfree(ifp);
454}
455
e55ffac6
BH		 456static void
457ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
458{
459 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 460 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 461
462 /*
463 * Each device address list is sorted in order of scope -
464 * global before linklocal.
465 */
466 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
467 ifap = &ifa->if_next) {
8a6ce0c0 468 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 469 break;
470 }
471
472 ifp->if_next = *ifap;
473 *ifap = ifp;
474}
475
1da177e4
LT		 476/* On success it returns ifp with increased reference count */
477
478static struct inet6_ifaddr *
479ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 480 int scope, u32 flags)
1da177e4
LT		 481{
482 struct inet6_ifaddr *ifa = NULL;
483 struct rt6_info *rt;
484 int hash;
485 int err = 0;
486
8814c4b5 487 rcu_read_lock_bh();
1da177e4
LT		 488 if (idev->dead) {
489 err = -ENODEV; /*XXX*/
490 goto out2;
491 }
492
493 write_lock(&addrconf_hash_lock);
494
495 /* Ignore adding duplicate addresses on an interface */
496 if (ipv6_chk_same_addr(addr, idev->dev)) {
497 ADBG(("ipv6_add_addr: already assigned\n"));
498 err = -EEXIST;
499 goto out;
500 }
501
322f74a4 502 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 503
504 if (ifa == NULL) {
505 ADBG(("ipv6_add_addr: malloc failed\n"));
506 err = -ENOBUFS;
507 goto out;
508 }
509
510 rt = addrconf_dst_alloc(idev, addr, 0);
511 if (IS_ERR(rt)) {
512 err = PTR_ERR(rt);
513 goto out;
514 }
515
1da177e4
LT		 516 ipv6_addr_copy(&ifa->addr, addr);
517
518 spin_lock_init(&ifa->lock);
519 init_timer(&ifa->timer);
520 ifa->timer.data = (unsigned long) ifa;
521 ifa->scope = scope;
522 ifa->prefix_len = pfxlen;
523 ifa->flags = flags | IFA_F_TENTATIVE;
524 ifa->cstamp = ifa->tstamp = jiffies;
525
57f5f544
KF		 526 ifa->rt = rt;
527
1da177e4
LT		 528 ifa->idev = idev;
529 in6_dev_hold(idev);
530 /* For caller */
531 in6_ifa_hold(ifa);
532
533 /* Add to big hash table */
534 hash = ipv6_addr_hash(addr);
535
536 ifa->lst_next = inet6_addr_lst[hash];
537 inet6_addr_lst[hash] = ifa;
538 in6_ifa_hold(ifa);
539 write_unlock(&addrconf_hash_lock);
540
541 write_lock(&idev->lock);
542 /* Add to inet6_dev unicast addr list. */
e55ffac6 543 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 544
545#ifdef CONFIG_IPV6_PRIVACY
546 if (ifa->flags&IFA_F_TEMPORARY) {
547 ifa->tmp_next = idev->tempaddr_list;
548 idev->tempaddr_list = ifa;
549 in6_ifa_hold(ifa);
550 }
551#endif
552
1da177e4
LT		 553 in6_ifa_hold(ifa);
554 write_unlock(&idev->lock);
555out2:
8814c4b5 556 rcu_read_unlock_bh();
1da177e4 557
fd92833a 558 if (likely(err == 0))
e041c683 559 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 560 else {
561 kfree(ifa);
562 ifa = ERR_PTR(err);
563 }
564
565 return ifa;
566out:
567 write_unlock(&addrconf_hash_lock);
568 goto out2;
569}
570
571/* This function wants to get referenced ifp and releases it before return */
572
573static void ipv6_del_addr(struct inet6_ifaddr *ifp)
574{
575 struct inet6_ifaddr *ifa, **ifap;
576 struct inet6_dev *idev = ifp->idev;
577 int hash;
578 int deleted = 0, onlink = 0;
579 unsigned long expires = jiffies;
580
581 hash = ipv6_addr_hash(&ifp->addr);
582
583 ifp->dead = 1;
584
585 write_lock_bh(&addrconf_hash_lock);
586 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
587 ifap = &ifa->lst_next) {
588 if (ifa == ifp) {
589 *ifap = ifa->lst_next;
590 __in6_ifa_put(ifp);
591 ifa->lst_next = NULL;
592 break;
593 }
594 }
595 write_unlock_bh(&addrconf_hash_lock);
596
597 write_lock_bh(&idev->lock);
598#ifdef CONFIG_IPV6_PRIVACY
599 if (ifp->flags&IFA_F_TEMPORARY) {
600 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
601 ifap = &ifa->tmp_next) {
602 if (ifa == ifp) {
603 *ifap = ifa->tmp_next;
604 if (ifp->ifpub) {
605 in6_ifa_put(ifp->ifpub);
606 ifp->ifpub = NULL;
607 }
608 __in6_ifa_put(ifp);
609 ifa->tmp_next = NULL;
610 break;
611 }
612 }
613 }
614#endif
615
1d142804 616 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 617 if (ifa == ifp) {
618 *ifap = ifa->if_next;
619 __in6_ifa_put(ifp);
620 ifa->if_next = NULL;
621 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
622 break;
623 deleted = 1;
1d142804 624 continue;
1da177e4
LT		 625 } else if (ifp->flags & IFA_F_PERMANENT) {
626 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
627 ifp->prefix_len)) {
628 if (ifa->flags & IFA_F_PERMANENT) {
629 onlink = 1;
630 if (deleted)
631 break;
632 } else {
633 unsigned long lifetime;
634
635 if (!onlink)
636 onlink = -1;
637
638 spin_lock(&ifa->lock);
639 lifetime = min_t(unsigned long,
640 ifa->valid_lft, 0x7fffffffUL/HZ);
641 if (time_before(expires,
642 ifa->tstamp + lifetime * HZ))
643 expires = ifa->tstamp + lifetime * HZ;
644 spin_unlock(&ifa->lock);
645 }
646 }
647 }
1d142804 648 ifap = &ifa->if_next;
1da177e4
LT		 649 }
650 write_unlock_bh(&idev->lock);
651
652 ipv6_ifa_notify(RTM_DELADDR, ifp);
653
e041c683 654 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 655
656 addrconf_del_timer(ifp);
657
658 /*
659 * Purge or update corresponding prefix
660 *
661 * 1) we don't purge prefix here if address was not permanent.
662 * prefix is managed by its own lifetime.
663 * 2) if there're no addresses, delete prefix.
664 * 3) if there're still other permanent address(es),
665 * corresponding prefix is still permanent.
666 * 4) otherwise, update prefix lifetime to the
667 * longest valid lifetime among the corresponding
668 * addresses on the device.
669 * Note: subsequent RA will update lifetime.
670 *
671 * --yoshfuji
672 */
673 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
674 struct in6_addr prefix;
675 struct rt6_info *rt;
676
677 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
678 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
679
680 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
681 if (onlink == 0) {
e0a1ad73 682 ip6_del_rt(rt);
1da177e4
LT		 683 rt = NULL;
684 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
685 rt->rt6i_expires = expires;
686 rt->rt6i_flags |= RTF_EXPIRES;
687 }
688 }
689 dst_release(&rt->u.dst);
690 }
691
692 in6_ifa_put(ifp);
693}
694
695#ifdef CONFIG_IPV6_PRIVACY
696static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
697{
698 struct inet6_dev *idev = ifp->idev;
699 struct in6_addr addr, *tmpaddr;
700 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
701 int tmp_plen;
702 int ret = 0;
703 int max_addresses;
704
705 write_lock(&idev->lock);
706 if (ift) {
707 spin_lock_bh(&ift->lock);
708 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
709 spin_unlock_bh(&ift->lock);
710 tmpaddr = &addr;
711 } else {
712 tmpaddr = NULL;
713 }
714retry:
715 in6_dev_hold(idev);
716 if (idev->cnf.use_tempaddr <= 0) {
717 write_unlock(&idev->lock);
718 printk(KERN_INFO
719 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
720 in6_dev_put(idev);
721 ret = -1;
722 goto out;
723 }
724 spin_lock_bh(&ifp->lock);
725 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
726 idev->cnf.use_tempaddr = -1; /*XXX*/
727 spin_unlock_bh(&ifp->lock);
728 write_unlock(&idev->lock);
729 printk(KERN_WARNING
730 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
731 in6_dev_put(idev);
732 ret = -1;
733 goto out;
734 }
735 in6_ifa_hold(ifp);
736 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
737 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
738 spin_unlock_bh(&ifp->lock);
739 write_unlock(&idev->lock);
740 printk(KERN_WARNING
741 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
742 in6_ifa_put(ifp);
743 in6_dev_put(idev);
744 ret = -1;
745 goto out;
746 }
747 memcpy(&addr.s6_addr[8], idev->rndid, 8);
748 tmp_valid_lft = min_t(__u32,
749 ifp->valid_lft,
750 idev->cnf.temp_valid_lft);
1ab1457c
YH		 751 tmp_prefered_lft = min_t(__u32,
752 ifp->prefered_lft,
1da177e4
LT		 753 idev->cnf.temp_prefered_lft - desync_factor / HZ);
754 tmp_plen = ifp->prefix_len;
755 max_addresses = idev->cnf.max_addresses;
756 tmp_cstamp = ifp->cstamp;
757 tmp_tstamp = ifp->tstamp;
758 spin_unlock_bh(&ifp->lock);
759
760 write_unlock(&idev->lock);
761 ift = !max_addresses ||
1ab1457c 762 ipv6_count_addresses(idev) < max_addresses ?
1da177e4
LT		 763 ipv6_add_addr(idev, &addr, tmp_plen,
764 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL;
765 if (!ift || IS_ERR(ift)) {
766 in6_ifa_put(ifp);
767 in6_dev_put(idev);
768 printk(KERN_INFO
769 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
770 tmpaddr = &addr;
771 write_lock(&idev->lock);
772 goto retry;
773 }
774
775 spin_lock_bh(&ift->lock);
776 ift->ifpub = ifp;
777 ift->valid_lft = tmp_valid_lft;
778 ift->prefered_lft = tmp_prefered_lft;
779 ift->cstamp = tmp_cstamp;
780 ift->tstamp = tmp_tstamp;
781 spin_unlock_bh(&ift->lock);
782
783 addrconf_dad_start(ift, 0);
784 in6_ifa_put(ift);
785 in6_dev_put(idev);
786out:
787 return ret;
788}
789#endif
790
791/*
072047e4 792 * Choose an appropriate source address (RFC3484)
1da177e4 793 */
072047e4
YH		 794struct ipv6_saddr_score {
795 int addr_type;
796 unsigned int attrs;
797 int matchlen;
0d27b427 798 int scope;
072047e4
YH		 799 unsigned int rule;
800};
801
802#define IPV6_SADDR_SCORE_LOCAL 0x0001
803#define IPV6_SADDR_SCORE_PREFERRED 0x0004
804#define IPV6_SADDR_SCORE_HOA 0x0008
805#define IPV6_SADDR_SCORE_OIF 0x0010
806#define IPV6_SADDR_SCORE_LABEL 0x0020
807#define IPV6_SADDR_SCORE_PRIVACY 0x0040
808
809static int inline ipv6_saddr_preferred(int type)
1da177e4 810{
072047e4
YH		 811 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
812 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
813 return 1;
814 return 0;
1da177e4
LT		 815}
816
072047e4
YH		 817/* static matching label */
818static int inline ipv6_saddr_label(const struct in6_addr *addr, int type)
819{
820 /*
821 * prefix (longest match) label
822 * -----------------------------
823 * ::1/128 0
824 * ::/0 1
825 * 2002::/16 2
826 * ::/96 3
827 * ::ffff:0:0/96 4
102128e3
ŁS		 828 * fc00::/7 5
829 * 2001::/32 6
072047e4
YH		 830 */
831 if (type & IPV6_ADDR_LOOPBACK)
832 return 0;
833 else if (type & IPV6_ADDR_COMPATv4)
834 return 3;
835 else if (type & IPV6_ADDR_MAPPED)
836 return 4;
102128e3
ŁS		 837 else if (addr->s6_addr32[0] == htonl(0x20010000))
838 return 6;
072047e4
YH		 839 else if (addr->s6_addr16[0] == htons(0x2002))
840 return 2;
102128e3
ŁS		 841 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
842 return 5;
072047e4
YH		 843 return 1;
844}
1da177e4 845
072047e4 846int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 847 struct in6_addr *daddr, struct in6_addr *saddr)
848{
072047e4
YH		 849 struct ipv6_saddr_score hiscore;
850 struct inet6_ifaddr *ifa_result = NULL;
851 int daddr_type = __ipv6_addr_type(daddr);
852 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
853 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
854 struct net_device *dev;
1da177e4 855
072047e4 856 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 857
072047e4 858 read_lock(&dev_base_lock);
8814c4b5 859 rcu_read_lock();
1da177e4 860
072047e4
YH		 861 for (dev = dev_base; dev; dev=dev->next) {
862 struct inet6_dev *idev;
863 struct inet6_ifaddr *ifa;
864
865 /* Rule 0: Candidate Source Address (section 4)
866 * - multicast and link-local destination address,
867 * the set of candidate source address MUST only
868 * include addresses assigned to interfaces
869 * belonging to the same link as the outgoing
870 * interface.
871 * (- For site-local destination addresses, the
872 * set of candidate source addresses MUST only
873 * include addresses assigned to interfaces
874 * belonging to the same site as the outgoing
875 * interface.)
876 */
877 if ((daddr_type & IPV6_ADDR_MULTICAST ||
878 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
879 daddr_dev && dev != daddr_dev)
880 continue;
1da177e4 881
1da177e4 882 idev = __in6_dev_get(dev);
072047e4
YH		 883 if (!idev)
884 continue;
885
886 read_lock_bh(&idev->lock);
887 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
888 struct ipv6_saddr_score score;
889
890 score.addr_type = __ipv6_addr_type(&ifa->addr);
891
6b3ae80a
YH		 892 /* Rule 0:
893 * - Tentative Address (RFC2462 section 5.4)
894 * - A tentative address is not considered
895 * "assigned to an interface" in the traditional
896 * sense.
897 * - Candidate Source Address (section 4)
072047e4
YH		 898 * - In any case, anycast addresses, multicast
899 * addresses, and the unspecified address MUST
900 * NOT be included in a candidate set.
901 */
6b3ae80a
YH		 902 if (ifa->flags & IFA_F_TENTATIVE)
903 continue;
072047e4
YH		 904 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
905 score.addr_type & IPV6_ADDR_MULTICAST)) {
906 LIMIT_NETDEBUG(KERN_DEBUG
907 "ADDRCONF: unspecified / multicast address"
908 "assigned as unicast address on %s",
909 dev->name);
910 continue;
911 }
912
913 score.attrs = 0;
914 score.matchlen = 0;
915 score.scope = 0;
916 score.rule = 0;
917
918 if (ifa_result == NULL) {
919 /* record it if the first available entry */
920 goto record_it;
921 }
922
923 /* Rule 1: Prefer same address */
924 if (hiscore.rule < 1) {
925 if (ipv6_addr_equal(&ifa_result->addr, daddr))
926 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
927 hiscore.rule++;
928 }
929 if (ipv6_addr_equal(&ifa->addr, daddr)) {
930 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
931 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
932 score.rule = 1;
933 goto record_it;
1da177e4 934 }
072047e4
YH		 935 } else {
936 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
937 continue;
1da177e4 938 }
1da177e4 939
072047e4
YH		 940 /* Rule 2: Prefer appropriate scope */
941 if (hiscore.rule < 2) {
942 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
943 hiscore.rule++;
944 }
945 score.scope = __ipv6_addr_src_scope(score.addr_type);
946 if (hiscore.scope < score.scope) {
947 if (hiscore.scope < daddr_scope) {
948 score.rule = 2;
949 goto record_it;
950 } else
951 continue;
952 } else if (score.scope < hiscore.scope) {
953 if (score.scope < daddr_scope)
e55ffac6 954 break; /* addresses sorted by scope */
072047e4
YH		 955 else {
956 score.rule = 2;
957 goto record_it;
958 }
959 }
1da177e4 960
072047e4
YH		 961 /* Rule 3: Avoid deprecated address */
962 if (hiscore.rule < 3) {
963 if (ipv6_saddr_preferred(hiscore.addr_type) ||
964 !(ifa_result->flags & IFA_F_DEPRECATED))
965 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
966 hiscore.rule++;
967 }
968 if (ipv6_saddr_preferred(score.addr_type) ||
969 !(ifa->flags & IFA_F_DEPRECATED)) {
970 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
971 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
972 score.rule = 3;
973 goto record_it;
974 }
975 } else {
976 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
977 continue;
978 }
1da177e4 979
3b9f9a1c
NT		 980 /* Rule 4: Prefer home address */
981#ifdef CONFIG_IPV6_MIP6
982 if (hiscore.rule < 4) {
983 if (ifa_result->flags & IFA_F_HOMEADDRESS)
984 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
985 hiscore.rule++;
986 }
987 if (ifa->flags & IFA_F_HOMEADDRESS) {
988 score.attrs |= IPV6_SADDR_SCORE_HOA;
989 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
990 score.rule = 4;
991 goto record_it;
992 }
993 } else {
994 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
995 continue;
996 }
997#else
220bbd74
YH		 998 if (hiscore.rule < 4)
999 hiscore.rule++;
3b9f9a1c 1000#endif
072047e4
YH		 1001
1002 /* Rule 5: Prefer outgoing interface */
1003 if (hiscore.rule < 5) {
1004 if (daddr_dev == NULL ||
1005 daddr_dev == ifa_result->idev->dev)
1006 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1007 hiscore.rule++;
1008 }
1009 if (daddr_dev == NULL ||
1010 daddr_dev == ifa->idev->dev) {
1011 score.attrs |= IPV6_SADDR_SCORE_OIF;
1012 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1013 score.rule = 5;
1014 goto record_it;
1015 }
1016 } else {
1017 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1018 continue;
1019 }
1020
1021 /* Rule 6: Prefer matching label */
1022 if (hiscore.rule < 6) {
1023 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1024 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1025 hiscore.rule++;
1026 }
1027 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1028 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1029 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1030 score.rule = 6;
1031 goto record_it;
1da177e4 1032 }
072047e4
YH		 1033 } else {
1034 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1035 continue;
1036 }
1037
44fd0261 1038#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1039 /* Rule 7: Prefer public address
1040 * Note: prefer temprary address if use_tempaddr >= 2
1041 */
1042 if (hiscore.rule < 7) {
1043 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1044 (ifa_result->idev->cnf.use_tempaddr >= 2))
1045 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1046 hiscore.rule++;
1047 }
1048 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1049 (ifa->idev->cnf.use_tempaddr >= 2)) {
1050 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1051 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1052 score.rule = 7;
1053 goto record_it;
1054 }
1055 } else {
1056 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1057 continue;
1058 }
5e2707fa
YH		 1059#else
1060 if (hiscore.rule < 7)
1061 hiscore.rule++;
44fd0261 1062#endif
072047e4 1063 /* Rule 8: Use longest matching prefix */
12da2a43 1064 if (hiscore.rule < 8) {
072047e4 1065 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1066 hiscore.rule++;
1067 }
072047e4
YH		 1068 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1069 if (score.matchlen > hiscore.matchlen) {
1070 score.rule = 8;
1071 goto record_it;
1da177e4 1072 }
072047e4
YH		 1073#if 0
1074 else if (score.matchlen < hiscore.matchlen)
1075 continue;
1076#endif
1077
1078 /* Final Rule: choose first available one */
1079 continue;
1080record_it:
1081 if (ifa_result)
1082 in6_ifa_put(ifa_result);
1083 in6_ifa_hold(ifa);
1084 ifa_result = ifa;
1085 hiscore = score;
1da177e4 1086 }
072047e4 1087 read_unlock_bh(&idev->lock);
1da177e4 1088 }
8814c4b5 1089 rcu_read_unlock();
1da177e4
LT		 1090 read_unlock(&dev_base_lock);
1091
072047e4
YH		 1092 if (!ifa_result)
1093 return -EADDRNOTAVAIL;
1ab1457c 1094
072047e4
YH		 1095 ipv6_addr_copy(saddr, &ifa_result->addr);
1096 in6_ifa_put(ifa_result);
1097 return 0;
1da177e4
LT		 1098}
1099
1100
1101int ipv6_get_saddr(struct dst_entry *dst,
1102 struct in6_addr *daddr, struct in6_addr *saddr)
1103{
7a3025b1 1104 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1105}
1106
1107
1108int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr)
1109{
1110 struct inet6_dev *idev;
1111 int err = -EADDRNOTAVAIL;
1112
8814c4b5 1113 rcu_read_lock();
1da177e4
LT		 1114 if ((idev = __in6_dev_get(dev)) != NULL) {
1115 struct inet6_ifaddr *ifp;
1116
1117 read_lock_bh(&idev->lock);
1118 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1119 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1120 ipv6_addr_copy(addr, &ifp->addr);
1121 err = 0;
1122 break;
1123 }
1124 }
1125 read_unlock_bh(&idev->lock);
1126 }
8814c4b5 1127 rcu_read_unlock();
1da177e4
LT		 1128 return err;
1129}
1130
1131static int ipv6_count_addresses(struct inet6_dev *idev)
1132{
1133 int cnt = 0;
1134 struct inet6_ifaddr *ifp;
1135
1136 read_lock_bh(&idev->lock);
1137 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1138 cnt++;
1139 read_unlock_bh(&idev->lock);
1140 return cnt;
1141}
1142
1143int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1144{
1145 struct inet6_ifaddr * ifp;
1146 u8 hash = ipv6_addr_hash(addr);
1147
1148 read_lock_bh(&addrconf_hash_lock);
1149 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1150 if (ipv6_addr_equal(&ifp->addr, addr) &&
1151 !(ifp->flags&IFA_F_TENTATIVE)) {
1152 if (dev == NULL || ifp->idev->dev == dev ||
1153 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1154 break;
1155 }
1156 }
1157 read_unlock_bh(&addrconf_hash_lock);
1158 return ifp != NULL;
1159}
1160
1161static
1162int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1163{
1164 struct inet6_ifaddr * ifp;
1165 u8 hash = ipv6_addr_hash(addr);
1166
1167 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1168 if (ipv6_addr_equal(&ifp->addr, addr)) {
1169 if (dev == NULL || ifp->idev->dev == dev)
1170 break;
1171 }
1172 }
1173 return ifp != NULL;
1174}
1175
1176struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1177{
1178 struct inet6_ifaddr * ifp;
1179 u8 hash = ipv6_addr_hash(addr);
1180
1181 read_lock_bh(&addrconf_hash_lock);
1182 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1183 if (ipv6_addr_equal(&ifp->addr, addr)) {
1184 if (dev == NULL || ifp->idev->dev == dev ||
1185 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1186 in6_ifa_hold(ifp);
1187 break;
1188 }
1189 }
1190 }
1191 read_unlock_bh(&addrconf_hash_lock);
1192
1193 return ifp;
1194}
1195
1196int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1197{
1198 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1199 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1200 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1201 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1202 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1203 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1204 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1205 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1206
1207 if (!sk2_rcv_saddr && !sk_ipv6only)
1208 return 1;
1209
1210 if (addr_type2 == IPV6_ADDR_ANY &&
1211 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1212 return 1;
1213
1214 if (addr_type == IPV6_ADDR_ANY &&
1215 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1216 return 1;
1217
1218 if (sk2_rcv_saddr6 &&
1219 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1220 return 1;
1221
1222 if (addr_type == IPV6_ADDR_MAPPED &&
1223 !sk2_ipv6only &&
1224 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1225 return 1;
1226
1227 return 0;
1228}
1229
1230/* Gets referenced address, destroys ifaddr */
1231
9f5336e2 1232static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1233{
1da177e4
LT		 1234 if (ifp->flags&IFA_F_PERMANENT) {
1235 spin_lock_bh(&ifp->lock);
1236 addrconf_del_timer(ifp);
1237 ifp->flags |= IFA_F_TENTATIVE;
1238 spin_unlock_bh(&ifp->lock);
1239 in6_ifa_put(ifp);
1240#ifdef CONFIG_IPV6_PRIVACY
1241 } else if (ifp->flags&IFA_F_TEMPORARY) {
1242 struct inet6_ifaddr *ifpub;
1243 spin_lock_bh(&ifp->lock);
1244 ifpub = ifp->ifpub;
1245 if (ifpub) {
1246 in6_ifa_hold(ifpub);
1247 spin_unlock_bh(&ifp->lock);
1248 ipv6_create_tempaddr(ifpub, ifp);
1249 in6_ifa_put(ifpub);
1250 } else {
1251 spin_unlock_bh(&ifp->lock);
1252 }
1253 ipv6_del_addr(ifp);
1254#endif
1255 } else
1256 ipv6_del_addr(ifp);
1257}
1258
3c21edbd
YH		 1259void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1260{
1261 if (net_ratelimit())
1262 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1263 addrconf_dad_stop(ifp);
1264}
1da177e4
LT		 1265
1266/* Join to solicited addr multicast group. */
1267
1268void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1269{
1270 struct in6_addr maddr;
1271
1272 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1273 return;
1274
1275 addrconf_addr_solict_mult(addr, &maddr);
1276 ipv6_dev_mc_inc(dev, &maddr);
1277}
1278
1279void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1280{
1281 struct in6_addr maddr;
1282
1283 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1284 return;
1285
1286 addrconf_addr_solict_mult(addr, &maddr);
1287 __ipv6_dev_mc_dec(idev, &maddr);
1288}
1289
20380731 1290static void addrconf_join_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_inc(ifp->idev->dev, &addr);
1297}
1298
20380731 1299static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1300{
1301 struct in6_addr addr;
1302 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1303 if (ipv6_addr_any(&addr))
1304 return;
1305 __ipv6_dev_ac_dec(ifp->idev, &addr);
1306}
1307
073a8e0e
YH		 1308static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1309{
1310 if (dev->addr_len != ETH_ALEN)
1311 return -1;
1312 memcpy(eui, dev->dev_addr, 3);
1313 memcpy(eui + 5, dev->dev_addr + 3, 3);
1314
1315 /*
1316 * The zSeries OSA network cards can be shared among various
1317 * OS instances, but the OSA cards have only one MAC address.
1318 * This leads to duplicate address conflicts in conjunction
1319 * with IPv6 if more than one instance uses the same card.
1320 *
1321 * The driver for these cards can deliver a unique 16-bit
1322 * identifier for each instance sharing the same card. It is
1323 * placed instead of 0xFFFE in the interface identifier. The
1324 * "u" bit of the interface identifier is not inverted in this
1325 * case. Hence the resulting interface identifier has local
1326 * scope according to RFC2373.
1327 */
1328 if (dev->dev_id) {
1329 eui[3] = (dev->dev_id >> 8) & 0xFF;
1330 eui[4] = dev->dev_id & 0xFF;
1331 } else {
1332 eui[3] = 0xFF;
1333 eui[4] = 0xFE;
1334 eui[0] ^= 2;
1335 }
1336 return 0;
1337}
1338
1339static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1340{
1341 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1342 if (dev->addr_len != ARCNET_ALEN)
1343 return -1;
1344 memset(eui, 0, 7);
1345 eui[7] = *(u8*)dev->dev_addr;
1346 return 0;
1347}
1348
1349static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1350{
1351 if (dev->addr_len != INFINIBAND_ALEN)
1352 return -1;
1353 memcpy(eui, dev->dev_addr + 12, 8);
1354 eui[0] |= 2;
1355 return 0;
1356}
1357
1da177e4
LT		 1358static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1359{
1360 switch (dev->type) {
1361 case ARPHRD_ETHER:
1362 case ARPHRD_FDDI:
1363 case ARPHRD_IEEE802_TR:
073a8e0e 1364 return addrconf_ifid_eui48(eui, dev);
1da177e4 1365 case ARPHRD_ARCNET:
073a8e0e 1366 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1367 case ARPHRD_INFINIBAND:
073a8e0e 1368 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1369 }
1370 return -1;
1371}
1372
1373static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1374{
1375 int err = -1;
1376 struct inet6_ifaddr *ifp;
1377
1378 read_lock_bh(&idev->lock);
1379 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1380 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1381 memcpy(eui, ifp->addr.s6_addr+8, 8);
1382 err = 0;
1383 break;
1384 }
1385 }
1386 read_unlock_bh(&idev->lock);
1387 return err;
1388}
1389
1390#ifdef CONFIG_IPV6_PRIVACY
1391/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1392static int __ipv6_regen_rndid(struct inet6_dev *idev)
1393{
1da177e4 1394regen:
955189ef 1395 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1396 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1397
1398 /*
1399 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1400 * check if generated address is not inappropriate
1401 *
1402 * - Reserved subnet anycast (RFC 2526)
1403 * 11111101 11....11 1xxxxxxx
1404 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1405 * 00-00-5E-FE-xx-xx-xx-xx
1406 * - value 0
1407 * - XXX: already assigned to an address on the device
1408 */
1ab1457c 1409 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1410 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1411 (idev->rndid[7]&0x80))
1412 goto regen;
1413 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1414 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1415 goto regen;
1416 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1417 goto regen;
1418 }
1419
1420 return 0;
1421}
1422
1423static void ipv6_regen_rndid(unsigned long data)
1424{
1425 struct inet6_dev *idev = (struct inet6_dev *) data;
1426 unsigned long expires;
1427
8814c4b5 1428 rcu_read_lock_bh();
1da177e4
LT		 1429 write_lock_bh(&idev->lock);
1430
1431 if (idev->dead)
1432 goto out;
1433
1434 if (__ipv6_regen_rndid(idev) < 0)
1435 goto out;
1ab1457c 1436
1da177e4 1437 expires = jiffies +
1ab1457c 1438 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1439 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1440 if (time_before(expires, jiffies)) {
1441 printk(KERN_WARNING
1442 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1443 idev->dev->name);
1444 goto out;
1445 }
1446
1447 if (!mod_timer(&idev->regen_timer, expires))
1448 in6_dev_hold(idev);
1449
1450out:
1451 write_unlock_bh(&idev->lock);
8814c4b5 1452 rcu_read_unlock_bh();
1da177e4
LT		 1453 in6_dev_put(idev);
1454}
1455
1456static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1457 int ret = 0;
1458
1459 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1460 ret = __ipv6_regen_rndid(idev);
1461 return ret;
1462}
1463#endif
1464
1465/*
1466 * Add prefix route.
1467 */
1468
1469static void
1470addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1471 unsigned long expires, u32 flags)
1da177e4 1472{
86872cb5
TG		 1473 struct fib6_config cfg = {
1474 .fc_table = RT6_TABLE_PREFIX,
1475 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1476 .fc_ifindex = dev->ifindex,
1477 .fc_expires = expires,
1478 .fc_dst_len = plen,
1479 .fc_flags = RTF_UP | flags,
1480 };
1da177e4 1481
86872cb5 1482 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1483
1484 /* Prevent useless cloning on PtP SIT.
1485 This thing is done here expecting that the whole
1486 class of non-broadcast devices need not cloning.
1487 */
0be669bb 1488#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1489 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1490 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1491#endif
1da177e4 1492
86872cb5 1493 ip6_route_add(&cfg);
1da177e4
LT		 1494}
1495
1496/* Create "default" multicast route to the interface */
1497
1498static void addrconf_add_mroute(struct net_device *dev)
1499{
86872cb5
TG		 1500 struct fib6_config cfg = {
1501 .fc_table = RT6_TABLE_LOCAL,
1502 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1503 .fc_ifindex = dev->ifindex,
1504 .fc_dst_len = 8,
1505 .fc_flags = RTF_UP,
1506 };
1507
1508 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1509
1510 ip6_route_add(&cfg);
1da177e4
LT		 1511}
1512
0be669bb 1513#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1514static void sit_route_add(struct net_device *dev)
1515{
86872cb5
TG		 1516 struct fib6_config cfg = {
1517 .fc_table = RT6_TABLE_MAIN,
1518 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1519 .fc_ifindex = dev->ifindex,
1520 .fc_dst_len = 96,
1521 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1522 };
1da177e4
LT		 1523
1524 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1525 ip6_route_add(&cfg);
1da177e4 1526}
0be669bb 1527#endif
1da177e4
LT		 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;
1ab1457c 1564
1da177e4
LT		 1565 if (len < sizeof(struct prefix_info)) {
1566 ADBG(("addrconf: prefix option too short\n"));
1567 return;
1568 }
1ab1457c 1569
1da177e4
LT		 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) {
e0a1ad73 1627 ip6_del_rt(rt);
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 */
1ab1457c 1761 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 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
0be669bb 1798#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1799 if (dev->type == ARPHRD_SIT) {
1800 struct ifreq ifr;
1801 mm_segment_t oldfs;
1802 struct ip_tunnel_parm p;
1803
1804 err = -EADDRNOTAVAIL;
1805 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1806 goto err_exit;
1807
1808 memset(&p, 0, sizeof(p));
1809 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1810 p.iph.saddr = 0;
1811 p.iph.version = 4;
1812 p.iph.ihl = 5;
1813 p.iph.protocol = IPPROTO_IPV6;
1814 p.iph.ttl = 64;
1815 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1816
1817 oldfs = get_fs(); set_fs(KERNEL_DS);
1818 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1819 set_fs(oldfs);
1820
1821 if (err == 0) {
1822 err = -ENOBUFS;
1823 if ((dev = __dev_get_by_name(p.name)) == NULL)
1824 goto err_exit;
1825 err = dev_open(dev);
1826 }
1827 }
0be669bb 1828#endif
1da177e4
LT		 1829
1830err_exit:
1831 rtnl_unlock();
1832 return err;
1833}
1834
1835/*
1836 * Manual configuration of address on an interface
1837 */
0778769d 1838static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1839 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1840{
1841 struct inet6_ifaddr *ifp;
1842 struct inet6_dev *idev;
1843 struct net_device *dev;
1844 int scope;
1845
1846 ASSERT_RTNL();
1ab1457c 1847
0778769d
NT		 1848 /* check the lifetime */
1849 if (!valid_lft || prefered_lft > valid_lft)
1850 return -EINVAL;
1851
1da177e4
LT		 1852 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1853 return -ENODEV;
1ab1457c 1854
1da177e4
LT		 1855 if ((idev = addrconf_add_dev(dev)) == NULL)
1856 return -ENOBUFS;
1857
1858 scope = ipv6_addr_scope(pfx);
1859
0778769d
NT		 1860 if (valid_lft == INFINITY_LIFE_TIME)
1861 ifa_flags |= IFA_F_PERMANENT;
1862 else if (valid_lft >= 0x7FFFFFFF/HZ)
1863 valid_lft = 0x7FFFFFFF/HZ;
1864
1865 if (prefered_lft == 0)
1866 ifa_flags |= IFA_F_DEPRECATED;
1867 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1868 (prefered_lft != INFINITY_LIFE_TIME))
1869 prefered_lft = 0x7FFFFFFF/HZ;
1870
1871 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1872
1da177e4 1873 if (!IS_ERR(ifp)) {
06aebfb7 1874 spin_lock_bh(&ifp->lock);
0778769d
NT		 1875 ifp->valid_lft = valid_lft;
1876 ifp->prefered_lft = prefered_lft;
1877 ifp->tstamp = jiffies;
06aebfb7 1878 spin_unlock_bh(&ifp->lock);
0778769d 1879
1da177e4
LT		 1880 addrconf_dad_start(ifp, 0);
1881 in6_ifa_put(ifp);
0778769d 1882 addrconf_verify(0);
1da177e4
LT		 1883 return 0;
1884 }
1885
1886 return PTR_ERR(ifp);
1887}
1888
1889static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1890{
1891 struct inet6_ifaddr *ifp;
1892 struct inet6_dev *idev;
1893 struct net_device *dev;
1ab1457c 1894
1da177e4
LT		 1895 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1896 return -ENODEV;
1897
1898 if ((idev = __in6_dev_get(dev)) == NULL)
1899 return -ENXIO;
1900
1901 read_lock_bh(&idev->lock);
1902 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1903 if (ifp->prefix_len == plen &&
1904 ipv6_addr_equal(pfx, &ifp->addr)) {
1905 in6_ifa_hold(ifp);
1906 read_unlock_bh(&idev->lock);
1ab1457c 1907
1da177e4
LT		 1908 ipv6_del_addr(ifp);
1909
1910 /* If the last address is deleted administratively,
1911 disable IPv6 on this interface.
1912 */
1913 if (idev->addr_list == NULL)
1914 addrconf_ifdown(idev->dev, 1);
1915 return 0;
1916 }
1917 }
1918 read_unlock_bh(&idev->lock);
1919 return -EADDRNOTAVAIL;
1920}
1921
1922
1923int addrconf_add_ifaddr(void __user *arg)
1924{
1925 struct in6_ifreq ireq;
1926 int err;
1ab1457c 1927
1da177e4
LT		 1928 if (!capable(CAP_NET_ADMIN))
1929 return -EPERM;
1ab1457c 1930
1da177e4
LT		 1931 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1932 return -EFAULT;
1933
1934 rtnl_lock();
0778769d 1935 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 1936 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1937 rtnl_unlock();
1938 return err;
1939}
1940
1941int addrconf_del_ifaddr(void __user *arg)
1942{
1943 struct in6_ifreq ireq;
1944 int err;
1ab1457c 1945
1da177e4
LT		 1946 if (!capable(CAP_NET_ADMIN))
1947 return -EPERM;
1948
1949 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1950 return -EFAULT;
1951
1952 rtnl_lock();
1953 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
1954 rtnl_unlock();
1955 return err;
1956}
1957
0be669bb 1958#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1959static void sit_add_v4_addrs(struct inet6_dev *idev)
1960{
1961 struct inet6_ifaddr * ifp;
1962 struct in6_addr addr;
1963 struct net_device *dev;
1964 int scope;
1965
1966 ASSERT_RTNL();
1967
1968 memset(&addr, 0, sizeof(struct in6_addr));
1969 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
1970
1971 if (idev->dev->flags&IFF_POINTOPOINT) {
1972 addr.s6_addr32[0] = htonl(0xfe800000);
1973 scope = IFA_LINK;
1974 } else {
1975 scope = IPV6_ADDR_COMPATv4;
1976 }
1977
1978 if (addr.s6_addr32[3]) {
1979 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
1980 if (!IS_ERR(ifp)) {
1981 spin_lock_bh(&ifp->lock);
1982 ifp->flags &= ~IFA_F_TENTATIVE;
1983 spin_unlock_bh(&ifp->lock);
1984 ipv6_ifa_notify(RTM_NEWADDR, ifp);
1985 in6_ifa_put(ifp);
1986 }
1987 return;
1988 }
1989
1ab1457c 1990 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 1991 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 1992 if (in_dev && (dev->flags & IFF_UP)) {
1993 struct in_ifaddr * ifa;
1994
1995 int flag = scope;
1996
1997 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
1998 int plen;
1999
2000 addr.s6_addr32[3] = ifa->ifa_local;
2001
2002 if (ifa->ifa_scope == RT_SCOPE_LINK)
2003 continue;
2004 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2005 if (idev->dev->flags&IFF_POINTOPOINT)
2006 continue;
2007 flag |= IFA_HOST;
2008 }
2009 if (idev->dev->flags&IFF_POINTOPOINT)
2010 plen = 64;
2011 else
2012 plen = 96;
2013
2014 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2015 IFA_F_PERMANENT);
2016 if (!IS_ERR(ifp)) {
2017 spin_lock_bh(&ifp->lock);
2018 ifp->flags &= ~IFA_F_TENTATIVE;
2019 spin_unlock_bh(&ifp->lock);
2020 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2021 in6_ifa_put(ifp);
2022 }
2023 }
2024 }
1ab1457c 2025 }
1da177e4 2026}
0be669bb 2027#endif
1da177e4
LT		 2028
2029static void init_loopback(struct net_device *dev)
2030{
2031 struct inet6_dev *idev;
2032 struct inet6_ifaddr * ifp;
2033
2034 /* ::1 */
2035
2036 ASSERT_RTNL();
2037
2038 if ((idev = ipv6_find_idev(dev)) == NULL) {
2039 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2040 return;
2041 }
2042
2043 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2044 if (!IS_ERR(ifp)) {
2045 spin_lock_bh(&ifp->lock);
2046 ifp->flags &= ~IFA_F_TENTATIVE;
2047 spin_unlock_bh(&ifp->lock);
2048 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2049 in6_ifa_put(ifp);
2050 }
2051}
2052
2053static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2054{
2055 struct inet6_ifaddr * ifp;
2056
2057 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT);
2058 if (!IS_ERR(ifp)) {
2059 addrconf_dad_start(ifp, 0);
2060 in6_ifa_put(ifp);
2061 }
2062}
2063
2064static void addrconf_dev_config(struct net_device *dev)
2065{
2066 struct in6_addr addr;
2067 struct inet6_dev * idev;
2068
2069 ASSERT_RTNL();
2070
1ab1457c 2071 if ((dev->type != ARPHRD_ETHER) &&
1da177e4
LT		 2072 (dev->type != ARPHRD_FDDI) &&
2073 (dev->type != ARPHRD_IEEE802_TR) &&
2074 (dev->type != ARPHRD_ARCNET) &&
2075 (dev->type != ARPHRD_INFINIBAND)) {
2076 /* Alas, we support only Ethernet autoconfiguration. */
2077 return;
2078 }
2079
2080 idev = addrconf_add_dev(dev);
2081 if (idev == NULL)
2082 return;
2083
2084 memset(&addr, 0, sizeof(struct in6_addr));
2085 addr.s6_addr32[0] = htonl(0xFE800000);
2086
2087 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2088 addrconf_add_linklocal(idev, &addr);
2089}
2090
0be669bb 2091#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2092static void addrconf_sit_config(struct net_device *dev)
2093{
2094 struct inet6_dev *idev;
2095
2096 ASSERT_RTNL();
2097
1ab1457c
YH		 2098 /*
2099 * Configure the tunnel with one of our IPv4
2100 * addresses... we should configure all of
1da177e4
LT		 2101 * our v4 addrs in the tunnel
2102 */
2103
2104 if ((idev = ipv6_find_idev(dev)) == NULL) {
2105 printk(KERN_DEBUG "init sit: add_dev failed\n");
2106 return;
2107 }
2108
2109 sit_add_v4_addrs(idev);
2110
2111 if (dev->flags&IFF_POINTOPOINT) {
2112 addrconf_add_mroute(dev);
2113 addrconf_add_lroute(dev);
2114 } else
2115 sit_route_add(dev);
2116}
0be669bb 2117#endif
1da177e4
LT		 2118
2119static inline int
2120ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2121{
2122 struct in6_addr lladdr;
2123
2124 if (!ipv6_get_lladdr(link_dev, &lladdr)) {
2125 addrconf_add_linklocal(idev, &lladdr);
2126 return 0;
2127 }
2128 return -1;
2129}
2130
2131static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2132{
2133 struct net_device *link_dev;
2134
2135 /* first try to inherit the link-local address from the link device */
2136 if (idev->dev->iflink &&
2137 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2138 if (!ipv6_inherit_linklocal(idev, link_dev))
2139 return;
2140 }
2141 /* then try to inherit it from any device */
2142 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2143 if (!ipv6_inherit_linklocal(idev, link_dev))
2144 return;
2145 }
2146 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2147}
2148
2149/*
2150 * Autoconfigure tunnel with a link-local address so routing protocols,
2151 * DHCPv6, MLD etc. can be run over the virtual link
2152 */
2153
2154static void addrconf_ip6_tnl_config(struct net_device *dev)
2155{
2156 struct inet6_dev *idev;
2157
2158 ASSERT_RTNL();
2159
2160 if ((idev = addrconf_add_dev(dev)) == NULL) {
2161 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2162 return;
2163 }
2164 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2165}
2166
1ab1457c 2167static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2168 void * data)
2169{
2170 struct net_device *dev = (struct net_device *) data;
2171 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2172 int run_pending = 0;
1da177e4
LT		 2173
2174 switch(event) {
2175 case NETDEV_UP:
3c21edbd
YH		 2176 case NETDEV_CHANGE:
2177 if (event == NETDEV_UP) {
2178 if (!netif_carrier_ok(dev)) {
2179 /* device is not ready yet. */
2180 printk(KERN_INFO
2181 "ADDRCONF(NETDEV_UP): %s: "
2182 "link is not ready\n",
2183 dev->name);
2184 break;
2185 }
99081049
KS		 2186
2187 if (idev)
2188 idev->if_flags |= IF_READY;
3c21edbd
YH		 2189 } else {
2190 if (!netif_carrier_ok(dev)) {
2191 /* device is still not ready. */
2192 break;
2193 }
2194
2195 if (idev) {
2196 if (idev->if_flags & IF_READY) {
2197 /* device is already configured. */
2198 break;
2199 }
2200 idev->if_flags |= IF_READY;
2201 }
2202
2203 printk(KERN_INFO
2204 "ADDRCONF(NETDEV_CHANGE): %s: "
2205 "link becomes ready\n",
2206 dev->name);
2207
c5e33bdd 2208 run_pending = 1;
3c21edbd
YH		 2209 }
2210
1da177e4 2211 switch(dev->type) {
0be669bb 2212#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2213 case ARPHRD_SIT:
2214 addrconf_sit_config(dev);
2215 break;
0be669bb 2216#endif
1da177e4
LT		 2217 case ARPHRD_TUNNEL6:
2218 addrconf_ip6_tnl_config(dev);
2219 break;
2220 case ARPHRD_LOOPBACK:
2221 init_loopback(dev);
2222 break;
2223
2224 default:
2225 addrconf_dev_config(dev);
2226 break;
2227 };
2228 if (idev) {
c5e33bdd
YH		 2229 if (run_pending)
2230 addrconf_dad_run(idev);
2231
1da177e4
LT		 2232 /* If the MTU changed during the interface down, when the
2233 interface up, the changed MTU must be reflected in the
2234 idev as well as routers.
2235 */
2236 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2237 rt6_mtu_change(dev, dev->mtu);
2238 idev->cnf.mtu6 = dev->mtu;
2239 }
2240 idev->tstamp = jiffies;
2241 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2242 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2243 stop IPv6 on this interface.
2244 */
2245 if (dev->mtu < IPV6_MIN_MTU)
2246 addrconf_ifdown(dev, event != NETDEV_DOWN);
2247 }
2248 break;
2249
2250 case NETDEV_CHANGEMTU:
2251 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2252 rt6_mtu_change(dev, dev->mtu);
2253 idev->cnf.mtu6 = dev->mtu;
2254 break;
2255 }
2256
2257 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2258
2259 case NETDEV_DOWN:
2260 case NETDEV_UNREGISTER:
2261 /*
2262 * Remove all addresses from this interface.
2263 */
2264 addrconf_ifdown(dev, event != NETDEV_DOWN);
2265 break;
3c21edbd 2266
1da177e4
LT		 2267 case NETDEV_CHANGENAME:
2268#ifdef CONFIG_SYSCTL
2269 if (idev) {
2270 addrconf_sysctl_unregister(&idev->cnf);
2271 neigh_sysctl_unregister(idev->nd_parms);
2272 neigh_sysctl_register(dev, idev->nd_parms,
2273 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2274 &ndisc_ifinfo_sysctl_change,
2275 NULL);
2276 addrconf_sysctl_register(idev, &idev->cnf);
2277 }
2278#endif
2279 break;
2280 };
2281
2282 return NOTIFY_OK;
2283}
2284
2285/*
2286 * addrconf module should be notified of a device going up
2287 */
2288static struct notifier_block ipv6_dev_notf = {
2289 .notifier_call = addrconf_notify,
2290 .priority = 0
2291};
2292
2293static int addrconf_ifdown(struct net_device *dev, int how)
2294{
2295 struct inet6_dev *idev;
2296 struct inet6_ifaddr *ifa, **bifa;
2297 int i;
2298
2299 ASSERT_RTNL();
2300
2301 if (dev == &loopback_dev && how == 1)
2302 how = 0;
2303
2304 rt6_ifdown(dev);
2305 neigh_ifdown(&nd_tbl, dev);
2306
2307 idev = __in6_dev_get(dev);
2308 if (idev == NULL)
2309 return -ENODEV;
2310
2311 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2312 Do not dev_put!
1da177e4
LT		 2313 */
2314 if (how == 1) {
1da177e4 2315 idev->dead = 1;
8814c4b5
YH		 2316
2317 /* protected by rtnl_lock */
2318 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2319
2320 /* Step 1.5: remove snmp6 entry */
2321 snmp6_unregister_dev(idev);
2322
2323 }
2324
2325 /* Step 2: clear hash table */
2326 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2327 bifa = &inet6_addr_lst[i];
2328
2329 write_lock_bh(&addrconf_hash_lock);
2330 while ((ifa = *bifa) != NULL) {
2331 if (ifa->idev == idev) {
2332 *bifa = ifa->lst_next;
2333 ifa->lst_next = NULL;
2334 addrconf_del_timer(ifa);
2335 in6_ifa_put(ifa);
2336 continue;
2337 }
2338 bifa = &ifa->lst_next;
2339 }
2340 write_unlock_bh(&addrconf_hash_lock);
2341 }
2342
2343 write_lock_bh(&idev->lock);
2344
2345 /* Step 3: clear flags for stateless addrconf */
2346 if (how != 1)
3c21edbd 2347 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2348
2349 /* Step 4: clear address list */
2350#ifdef CONFIG_IPV6_PRIVACY
2351 if (how == 1 && del_timer(&idev->regen_timer))
2352 in6_dev_put(idev);
2353
2354 /* clear tempaddr list */
2355 while ((ifa = idev->tempaddr_list) != NULL) {
2356 idev->tempaddr_list = ifa->tmp_next;
2357 ifa->tmp_next = NULL;
2358 ifa->dead = 1;
2359 write_unlock_bh(&idev->lock);
2360 spin_lock_bh(&ifa->lock);
2361
2362 if (ifa->ifpub) {
2363 in6_ifa_put(ifa->ifpub);
2364 ifa->ifpub = NULL;
2365 }
2366 spin_unlock_bh(&ifa->lock);
2367 in6_ifa_put(ifa);
2368 write_lock_bh(&idev->lock);
2369 }
2370#endif
2371 while ((ifa = idev->addr_list) != NULL) {
2372 idev->addr_list = ifa->if_next;
2373 ifa->if_next = NULL;
2374 ifa->dead = 1;
2375 addrconf_del_timer(ifa);
2376 write_unlock_bh(&idev->lock);
2377
2378 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2379 in6_ifa_put(ifa);
2380
2381 write_lock_bh(&idev->lock);
2382 }
2383 write_unlock_bh(&idev->lock);
2384
2385 /* Step 5: Discard multicast list */
2386
2387 if (how == 1)
2388 ipv6_mc_destroy_dev(idev);
2389 else
2390 ipv6_mc_down(idev);
2391
2392 /* Step 5: netlink notification of this interface */
2393 idev->tstamp = jiffies;
979ad663 2394 inet6_ifinfo_notify(RTM_DELLINK, idev);
1ab1457c 2395
1da177e4
LT		 2396 /* Shot the device (if unregistered) */
2397
2398 if (how == 1) {
2399#ifdef CONFIG_SYSCTL
2400 addrconf_sysctl_unregister(&idev->cnf);
2401 neigh_sysctl_unregister(idev->nd_parms);
2402#endif
2403 neigh_parms_release(&nd_tbl, idev->nd_parms);
2404 neigh_ifdown(&nd_tbl, dev);
2405 in6_dev_put(idev);
2406 }
2407 return 0;
2408}
2409
2410static void addrconf_rs_timer(unsigned long data)
2411{
2412 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2413
2414 if (ifp->idev->cnf.forwarding)
2415 goto out;
2416
2417 if (ifp->idev->if_flags & IF_RA_RCVD) {
2418 /*
2419 * Announcement received after solicitation
2420 * was sent
2421 */
2422 goto out;
2423 }
2424
2425 spin_lock(&ifp->lock);
2426 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2427 struct in6_addr all_routers;
2428
2429 /* The wait after the last probe can be shorter */
2430 addrconf_mod_timer(ifp, AC_RS,
2431 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2432 ifp->idev->cnf.rtr_solicit_delay :
2433 ifp->idev->cnf.rtr_solicit_interval);
2434 spin_unlock(&ifp->lock);
2435
2436 ipv6_addr_all_routers(&all_routers);
2437
2438 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2439 } else {
2440 spin_unlock(&ifp->lock);
2441 /*
2442 * Note: we do not support deprecated "all on-link"
2443 * assumption any longer.
2444 */
2445 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2446 ifp->idev->dev->name);
2447 }
2448
2449out:
2450 in6_ifa_put(ifp);
2451}
2452
2453/*
2454 * Duplicate Address Detection
2455 */
3c21edbd
YH		 2456static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2457{
2458 unsigned long rand_num;
2459 struct inet6_dev *idev = ifp->idev;
2460
2461 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2462 ifp->probes = idev->cnf.dad_transmits;
2463 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2464}
2465
e431b8c0 2466static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2467{
2468 struct inet6_dev *idev = ifp->idev;
2469 struct net_device *dev = idev->dev;
1da177e4
LT		 2470
2471 addrconf_join_solict(dev, &ifp->addr);
2472
2473 if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT))
2474 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0,
2475 flags);
2476
2477 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2478
2479 read_lock_bh(&idev->lock);
2480 if (ifp->dead)
2481 goto out;
2482 spin_lock_bh(&ifp->lock);
2483
2484 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2485 !(ifp->flags&IFA_F_TENTATIVE) ||
2486 ifp->flags & IFA_F_NODAD) {
1da177e4
LT		 2487 ifp->flags &= ~IFA_F_TENTATIVE;
2488 spin_unlock_bh(&ifp->lock);
2489 read_unlock_bh(&idev->lock);
2490
2491 addrconf_dad_completed(ifp);
2492 return;
2493 }
2494
6732bade 2495 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2496 spin_unlock_bh(&ifp->lock);
6732bade 2497 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2498 /*
2499 * If the defice is not ready:
2500 * - keep it tentative if it is a permanent address.
2501 * - otherwise, kill it.
2502 */
2503 in6_ifa_hold(ifp);
2504 addrconf_dad_stop(ifp);
6732bade 2505 return;
3c21edbd 2506 }
6732bade
YH		 2507 addrconf_dad_kick(ifp);
2508 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2509out:
2510 read_unlock_bh(&idev->lock);
2511}
2512
2513static void addrconf_dad_timer(unsigned long data)
2514{
2515 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2516 struct inet6_dev *idev = ifp->idev;
2517 struct in6_addr unspec;
2518 struct in6_addr mcaddr;
2519
2520 read_lock_bh(&idev->lock);
2521 if (idev->dead) {
2522 read_unlock_bh(&idev->lock);
2523 goto out;
2524 }
2525 spin_lock_bh(&ifp->lock);
2526 if (ifp->probes == 0) {
2527 /*
2528 * DAD was successful
2529 */
2530
2531 ifp->flags &= ~IFA_F_TENTATIVE;
2532 spin_unlock_bh(&ifp->lock);
2533 read_unlock_bh(&idev->lock);
2534
2535 addrconf_dad_completed(ifp);
2536
2537 goto out;
2538 }
2539
2540 ifp->probes--;
2541 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2542 spin_unlock_bh(&ifp->lock);
2543 read_unlock_bh(&idev->lock);
2544
2545 /* send a neighbour solicitation for our addr */
2546 memset(&unspec, 0, sizeof(unspec));
2547 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2548 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2549out:
2550 in6_ifa_put(ifp);
2551}
2552
2553static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2554{
2555 struct net_device * dev = ifp->idev->dev;
2556
2557 /*
2558 * Configure the address for reception. Now it is valid.
2559 */
2560
2561 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2562
2563 /* If added prefix is link local and forwarding is off,
2564 start sending router solicitations.
2565 */
2566
2567 if (ifp->idev->cnf.forwarding == 0 &&
2568 ifp->idev->cnf.rtr_solicits > 0 &&
2569 (dev->flags&IFF_LOOPBACK) == 0 &&
2570 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2571 struct in6_addr all_routers;
2572
2573 ipv6_addr_all_routers(&all_routers);
2574
2575 /*
2576 * If a host as already performed a random delay
2577 * [...] as part of DAD [...] there is no need
2578 * to delay again before sending the first RS
2579 */
2580 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2581
2582 spin_lock_bh(&ifp->lock);
2583 ifp->probes = 1;
2584 ifp->idev->if_flags |= IF_RS_SENT;
2585 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2586 spin_unlock_bh(&ifp->lock);
2587 }
2588}
2589
c5e33bdd
YH		 2590static void addrconf_dad_run(struct inet6_dev *idev) {
2591 struct inet6_ifaddr *ifp;
2592
2593 read_lock_bh(&idev->lock);
2594 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2595 spin_lock_bh(&ifp->lock);
2596 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2597 spin_unlock_bh(&ifp->lock);
2598 continue;
2599 }
2600 spin_unlock_bh(&ifp->lock);
2601 addrconf_dad_kick(ifp);
2602 }
2603 read_unlock_bh(&idev->lock);
2604}
2605
1da177e4
LT		 2606#ifdef CONFIG_PROC_FS
2607struct if6_iter_state {
2608 int bucket;
2609};
2610
2611static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2612{
2613 struct inet6_ifaddr *ifa = NULL;
2614 struct if6_iter_state *state = seq->private;
2615
2616 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2617 ifa = inet6_addr_lst[state->bucket];
2618 if (ifa)
2619 break;
2620 }
2621 return ifa;
2622}
2623
2624static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2625{
2626 struct if6_iter_state *state = seq->private;
2627
2628 ifa = ifa->lst_next;
2629try_again:
2630 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2631 ifa = inet6_addr_lst[state->bucket];
2632 goto try_again;
2633 }
2634 return ifa;
2635}
2636
2637static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2638{
2639 struct inet6_ifaddr *ifa = if6_get_first(seq);
2640
2641 if (ifa)
2642 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2643 --pos;
2644 return pos ? NULL : ifa;
2645}
2646
2647static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2648{
2649 read_lock_bh(&addrconf_hash_lock);
2650 return if6_get_idx(seq, *pos);
2651}
2652
2653static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2654{
2655 struct inet6_ifaddr *ifa;
2656
2657 ifa = if6_get_next(seq, v);
2658 ++*pos;
2659 return ifa;
2660}
2661
2662static void if6_seq_stop(struct seq_file *seq, void *v)
2663{
2664 read_unlock_bh(&addrconf_hash_lock);
2665}
2666
2667static int if6_seq_show(struct seq_file *seq, void *v)
2668{
2669 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2670 seq_printf(seq,
9343e79a 2671 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2672 NIP6(ifp->addr),
2673 ifp->idev->dev->ifindex,
2674 ifp->prefix_len,
2675 ifp->scope,
2676 ifp->flags,
2677 ifp->idev->dev->name);
2678 return 0;
2679}
2680
2681static struct seq_operations if6_seq_ops = {
2682 .start = if6_seq_start,
2683 .next = if6_seq_next,
2684 .show = if6_seq_show,
2685 .stop = if6_seq_stop,
2686};
2687
2688static int if6_seq_open(struct inode *inode, struct file *file)
2689{
2690 struct seq_file *seq;
2691 int rc = -ENOMEM;
322f74a4 2692 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2693
2694 if (!s)
2695 goto out;
1da177e4
LT		 2696
2697 rc = seq_open(file, &if6_seq_ops);
2698 if (rc)
2699 goto out_kfree;
2700
2701 seq = file->private_data;
2702 seq->private = s;
2703out:
2704 return rc;
2705out_kfree:
2706 kfree(s);
2707 goto out;
2708}
2709
9a32144e 2710static const struct file_operations if6_fops = {
1da177e4
LT		 2711 .owner = THIS_MODULE,
2712 .open = if6_seq_open,
2713 .read = seq_read,
2714 .llseek = seq_lseek,
2715 .release = seq_release_private,
2716};
2717
2718int __init if6_proc_init(void)
2719{
2720 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2721 return -ENOMEM;
2722 return 0;
2723}
2724
2725void if6_proc_exit(void)
2726{
2727 proc_net_remove("if_inet6");
2728}
2729#endif /* CONFIG_PROC_FS */
2730
3b9f9a1c
NT		 2731#ifdef CONFIG_IPV6_MIP6
2732/* Check if address is a home address configured on any interface. */
2733int ipv6_chk_home_addr(struct in6_addr *addr)
2734{
2735 int ret = 0;
2736 struct inet6_ifaddr * ifp;
2737 u8 hash = ipv6_addr_hash(addr);
2738 read_lock_bh(&addrconf_hash_lock);
2739 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2740 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2741 (ifp->flags & IFA_F_HOMEADDRESS)) {
2742 ret = 1;
2743 break;
2744 }
2745 }
2746 read_unlock_bh(&addrconf_hash_lock);
2747 return ret;
2748}
2749#endif
2750
1da177e4
LT		 2751/*
2752 * Periodic address status verification
2753 */
2754
2755static void addrconf_verify(unsigned long foo)
2756{
2757 struct inet6_ifaddr *ifp;
2758 unsigned long now, next;
2759 int i;
2760
2761 spin_lock_bh(&addrconf_verify_lock);
2762 now = jiffies;
2763 next = now + ADDR_CHECK_FREQUENCY;
2764
2765 del_timer(&addr_chk_timer);
2766
2767 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2768
2769restart:
5d5780df 2770 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2771 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2772 unsigned long age;
2773#ifdef CONFIG_IPV6_PRIVACY
2774 unsigned long regen_advance;
2775#endif
2776
2777 if (ifp->flags & IFA_F_PERMANENT)
2778 continue;
2779
2780 spin_lock(&ifp->lock);
2781 age = (now - ifp->tstamp) / HZ;
2782
2783#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2784 regen_advance = ifp->idev->cnf.regen_max_retry *
2785 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2786 ifp->idev->nd_parms->retrans_time / HZ;
2787#endif
2788
8f27ebb9
YH		 2789 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2790 age >= ifp->valid_lft) {
1da177e4
LT		 2791 spin_unlock(&ifp->lock);
2792 in6_ifa_hold(ifp);
5d5780df 2793 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2794 ipv6_del_addr(ifp);
2795 goto restart;
8f27ebb9
YH		 2796 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2797 spin_unlock(&ifp->lock);
2798 continue;
1da177e4
LT		 2799 } else if (age >= ifp->prefered_lft) {
2800 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2801 int deprecate = 0;
2802
2803 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2804 deprecate = 1;
2805 ifp->flags |= IFA_F_DEPRECATED;
2806 }
2807
2808 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2809 next = ifp->tstamp + ifp->valid_lft * HZ;
2810
2811 spin_unlock(&ifp->lock);
2812
2813 if (deprecate) {
2814 in6_ifa_hold(ifp);
5d5780df 2815 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2816
2817 ipv6_ifa_notify(0, ifp);
2818 in6_ifa_put(ifp);
2819 goto restart;
2820 }
2821#ifdef CONFIG_IPV6_PRIVACY
2822 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2823 !(ifp->flags&IFA_F_TENTATIVE)) {
2824 if (age >= ifp->prefered_lft - regen_advance) {
2825 struct inet6_ifaddr *ifpub = ifp->ifpub;
2826 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2827 next = ifp->tstamp + ifp->prefered_lft * HZ;
2828 if (!ifp->regen_count && ifpub) {
2829 ifp->regen_count++;
2830 in6_ifa_hold(ifp);
2831 in6_ifa_hold(ifpub);
2832 spin_unlock(&ifp->lock);
5d5780df 2833 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2834 spin_lock(&ifpub->lock);
2835 ifpub->regen_count = 0;
2836 spin_unlock(&ifpub->lock);
1da177e4
LT		 2837 ipv6_create_tempaddr(ifpub, ifp);
2838 in6_ifa_put(ifpub);
2839 in6_ifa_put(ifp);
2840 goto restart;
2841 }
2842 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2843 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2844 spin_unlock(&ifp->lock);
2845#endif
2846 } else {
2847 /* ifp->prefered_lft <= ifp->valid_lft */
2848 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2849 next = ifp->tstamp + ifp->prefered_lft * HZ;
2850 spin_unlock(&ifp->lock);
2851 }
2852 }
5d5780df 2853 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2854 }
2855
2856 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2857 add_timer(&addr_chk_timer);
2858 spin_unlock_bh(&addrconf_verify_lock);
2859}
2860
461d8837
TG		 2861static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2862{
2863 struct in6_addr *pfx = NULL;
2864
2865 if (addr)
2866 pfx = nla_data(addr);
2867
2868 if (local) {
2869 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2870 pfx = NULL;
2871 else
2872 pfx = nla_data(local);
2873 }
2874
2875 return pfx;
2876}
2877
2878static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2879 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2880 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2881 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2882};
2883
1da177e4
LT		 2884static int
2885inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2886{
b933f716
TG		 2887 struct ifaddrmsg *ifm;
2888 struct nlattr *tb[IFA_MAX+1];
1da177e4 2889 struct in6_addr *pfx;
b933f716 2890 int err;
1da177e4 2891
b933f716
TG		 2892 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2893 if (err < 0)
2894 return err;
2895
2896 ifm = nlmsg_data(nlh);
2897 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 2898 if (pfx == NULL)
2899 return -EINVAL;
2900
2901 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2902}
2903
55ebaef1
NT		 2904static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2905 u32 prefered_lft, u32 valid_lft)
081bba5b 2906{
081bba5b
NT		 2907 if (!valid_lft || (prefered_lft > valid_lft))
2908 return -EINVAL;
2909
081bba5b 2910 if (valid_lft == INFINITY_LIFE_TIME)
55ebaef1 2911 ifa_flags |= IFA_F_PERMANENT;
081bba5b
NT		 2912 else if (valid_lft >= 0x7FFFFFFF/HZ)
2913 valid_lft = 0x7FFFFFFF/HZ;
2914
2915 if (prefered_lft == 0)
55ebaef1 2916 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 2917 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2918 (prefered_lft != INFINITY_LIFE_TIME))
2919 prefered_lft = 0x7FFFFFFF/HZ;
2920
2921 spin_lock_bh(&ifp->lock);
3b9f9a1c 2922 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 2923 ifp->tstamp = jiffies;
2924 ifp->valid_lft = valid_lft;
2925 ifp->prefered_lft = prefered_lft;
2926
2927 spin_unlock_bh(&ifp->lock);
2928 if (!(ifp->flags&IFA_F_TENTATIVE))
2929 ipv6_ifa_notify(0, ifp);
081bba5b
NT		 2930
2931 addrconf_verify(0);
2932
2933 return 0;
2934}
2935
1da177e4
LT		 2936static int
2937inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2938{
461d8837
TG		 2939 struct ifaddrmsg *ifm;
2940 struct nlattr *tb[IFA_MAX+1];
1da177e4 2941 struct in6_addr *pfx;
7198f8ce
TG		 2942 struct inet6_ifaddr *ifa;
2943 struct net_device *dev;
55ebaef1
NT		 2944 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
2945 u8 ifa_flags;
461d8837 2946 int err;
1da177e4 2947
461d8837
TG		 2948 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2949 if (err < 0)
2950 return err;
2951
2952 ifm = nlmsg_data(nlh);
2953 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 2954 if (pfx == NULL)
2955 return -EINVAL;
2956
461d8837 2957 if (tb[IFA_CACHEINFO]) {
0778769d 2958 struct ifa_cacheinfo *ci;
461d8837
TG		 2959
2960 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 2961 valid_lft = ci->ifa_valid;
461d8837
TG		 2962 preferred_lft = ci->ifa_prefered;
2963 } else {
2964 preferred_lft = INFINITY_LIFE_TIME;
2965 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 2966 }
2967
7198f8ce
TG		 2968 dev = __dev_get_by_index(ifm->ifa_index);
2969 if (dev == NULL)
2970 return -ENODEV;
2971
55ebaef1 2972 /* We ignore other flags so far. */
3b9f9a1c 2973 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 2974
7198f8ce
TG		 2975 ifa = ipv6_get_ifaddr(pfx, dev, 1);
2976 if (ifa == NULL) {
2977 /*
2978 * It would be best to check for !NLM_F_CREATE here but
2979 * userspace alreay relies on not having to provide this.
2980 */
2981 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 2982 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 2983 }
2984
7198f8ce
TG		 2985 if (nlh->nlmsg_flags & NLM_F_EXCL ||
2986 !(nlh->nlmsg_flags & NLM_F_REPLACE))
2987 err = -EEXIST;
2988 else
55ebaef1 2989 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 2990
2991 in6_ifa_put(ifa);
2992
2993 return err;
1da177e4
LT		 2994}
2995
101bb229
TG		 2996static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
2997 u8 scope, int ifindex)
2998{
2999 struct ifaddrmsg *ifm;
3000
3001 ifm = nlmsg_data(nlh);
3002 ifm->ifa_family = AF_INET6;
3003 ifm->ifa_prefixlen = prefixlen;
3004 ifm->ifa_flags = flags;
3005 ifm->ifa_scope = scope;
3006 ifm->ifa_index = ifindex;
3007}
3008
85486af0
TG		 3009static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3010 unsigned long tstamp, u32 preferred, u32 valid)
3011{
3012 struct ifa_cacheinfo ci;
3013
3014 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3015 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3016 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3017 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3018 ci.ifa_prefered = preferred;
3019 ci.ifa_valid = valid;
3020
3021 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3022}
3023
101bb229
TG		 3024static inline int rt_scope(int ifa_scope)
3025{
3026 if (ifa_scope & IFA_HOST)
3027 return RT_SCOPE_HOST;
3028 else if (ifa_scope & IFA_LINK)
3029 return RT_SCOPE_LINK;
3030 else if (ifa_scope & IFA_SITE)
3031 return RT_SCOPE_SITE;
3032 else
3033 return RT_SCOPE_UNIVERSE;
3034}
3035
0ab6803b
TG		 3036static inline int inet6_ifaddr_msgsize(void)
3037{
339bf98f
TG		 3038 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3039 + nla_total_size(16) /* IFA_ADDRESS */
3040 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3041}
c5396a31 3042
1da177e4 3043static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3044 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3045{
1da177e4 3046 struct nlmsghdr *nlh;
85486af0 3047 u32 preferred, valid;
1da177e4 3048
0ab6803b
TG		 3049 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3050 if (nlh == NULL)
26932566 3051 return -EMSGSIZE;
0ab6803b 3052
101bb229
TG		 3053 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3054 ifa->idev->dev->ifindex);
3055
1da177e4 3056 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3057 preferred = ifa->prefered_lft;
3058 valid = ifa->valid_lft;
3059 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3060 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3061 preferred -= tval;
3062 if (valid != INFINITY_LIFE_TIME)
3063 valid -= tval;
1da177e4
LT		 3064 }
3065 } else {
85486af0
TG		 3066 preferred = INFINITY_LIFE_TIME;
3067 valid = INFINITY_LIFE_TIME;
3068 }
3069
0ab6803b 3070 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3071 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3072 nlmsg_cancel(skb, nlh);
3073 return -EMSGSIZE;
3074 }
1da177e4 3075
0ab6803b 3076 return nlmsg_end(skb, nlh);
1da177e4
LT		 3077}
3078
3079static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3080 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3081{
1da177e4 3082 struct nlmsghdr *nlh;
101bb229
TG		 3083 u8 scope = RT_SCOPE_UNIVERSE;
3084 int ifindex = ifmca->idev->dev->ifindex;
3085
3086 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3087 scope = RT_SCOPE_SITE;
1da177e4 3088
0ab6803b
TG		 3089 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3090 if (nlh == NULL)
26932566 3091 return -EMSGSIZE;
85486af0 3092
0ab6803b
TG		 3093 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3094 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3095 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3096 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3097 nlmsg_cancel(skb, nlh);
3098 return -EMSGSIZE;
3099 }
85486af0 3100
0ab6803b 3101 return nlmsg_end(skb, nlh);
1da177e4
LT		 3102}
3103
3104static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3105 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3106{
1da177e4 3107 struct nlmsghdr *nlh;
101bb229
TG		 3108 u8 scope = RT_SCOPE_UNIVERSE;
3109 int ifindex = ifaca->aca_idev->dev->ifindex;
3110
3111 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3112 scope = RT_SCOPE_SITE;
1da177e4 3113
0ab6803b
TG		 3114 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3115 if (nlh == NULL)
26932566 3116 return -EMSGSIZE;
85486af0 3117
0ab6803b
TG		 3118 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3119 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3120 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3121 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3122 nlmsg_cancel(skb, nlh);
3123 return -EMSGSIZE;
3124 }
1da177e4 3125
0ab6803b 3126 return nlmsg_end(skb, nlh);
1da177e4
LT		 3127}
3128
3129enum addr_type_t
3130{
3131 UNICAST_ADDR,
3132 MULTICAST_ADDR,
3133 ANYCAST_ADDR,
3134};
3135
3136static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3137 enum addr_type_t type)
3138{
3139 int idx, ip_idx;
3140 int s_idx, s_ip_idx;
3141 int err = 1;
3142 struct net_device *dev;
3143 struct inet6_dev *idev = NULL;
3144 struct inet6_ifaddr *ifa;
3145 struct ifmcaddr6 *ifmca;
3146 struct ifacaddr6 *ifaca;
3147
3148 s_idx = cb->args[0];
3149 s_ip_idx = ip_idx = cb->args[1];
3150 read_lock(&dev_base_lock);
1ab1457c 3151
1da177e4
LT		 3152 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3153 if (idx < s_idx)
3154 continue;
3155 if (idx > s_idx)
3156 s_ip_idx = 0;
3157 ip_idx = 0;
3158 if ((idev = in6_dev_get(dev)) == NULL)
3159 continue;
3160 read_lock_bh(&idev->lock);
3161 switch (type) {
3162 case UNICAST_ADDR:
ae9cda5d 3163 /* unicast address incl. temp addr */
1da177e4
LT		 3164 for (ifa = idev->addr_list; ifa;
3165 ifa = ifa->if_next, ip_idx++) {
3166 if (ip_idx < s_ip_idx)
3167 continue;
1ab1457c
YH		 3168 if ((err = inet6_fill_ifaddr(skb, ifa,
3169 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3170 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3171 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3172 goto done;
3173 }
1da177e4
LT		 3174 break;
3175 case MULTICAST_ADDR:
3176 /* multicast address */
1ab1457c 3177 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3178 ifmca = ifmca->next, ip_idx++) {
3179 if (ip_idx < s_ip_idx)
3180 continue;
1ab1457c
YH		 3181 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3182 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3183 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3184 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3185 goto done;
3186 }
3187 break;
3188 case ANYCAST_ADDR:
3189 /* anycast address */
3190 for (ifaca = idev->ac_list; ifaca;
3191 ifaca = ifaca->aca_next, ip_idx++) {
3192 if (ip_idx < s_ip_idx)
3193 continue;
1ab1457c
YH		 3194 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3195 NETLINK_CB(cb->skb).pid,
b6544c0b 3196 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3197 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3198 goto done;
3199 }
3200 break;
3201 default:
3202 break;
3203 }
3204 read_unlock_bh(&idev->lock);
3205 in6_dev_put(idev);
3206 }
3207done:
3208 if (err <= 0) {
3209 read_unlock_bh(&idev->lock);
3210 in6_dev_put(idev);
3211 }
3212 read_unlock(&dev_base_lock);
3213 cb->args[0] = idx;
3214 cb->args[1] = ip_idx;
3215 return skb->len;
3216}
3217
3218static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3219{
3220 enum addr_type_t type = UNICAST_ADDR;
3221 return inet6_dump_addr(skb, cb, type);
3222}
3223
3224static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3225{
3226 enum addr_type_t type = MULTICAST_ADDR;
3227 return inet6_dump_addr(skb, cb, type);
3228}
3229
3230
3231static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3232{
3233 enum addr_type_t type = ANYCAST_ADDR;
3234 return inet6_dump_addr(skb, cb, type);
3235}
3236
1b29fc2c
TG		 3237static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3238 void *arg)
6c223828 3239{
1b29fc2c
TG		 3240 struct ifaddrmsg *ifm;
3241 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3242 struct in6_addr *addr = NULL;
3243 struct net_device *dev = NULL;
3244 struct inet6_ifaddr *ifa;
3245 struct sk_buff *skb;
6c223828
NT		 3246 int err;
3247
1b29fc2c
TG		 3248 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3249 if (err < 0)
3250 goto errout;
3251
3252 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3253 if (addr == NULL) {
3254 err = -EINVAL;
3255 goto errout;
6c223828 3256 }
6c223828 3257
1b29fc2c 3258 ifm = nlmsg_data(nlh);
6c223828
NT		 3259 if (ifm->ifa_index)
3260 dev = __dev_get_by_index(ifm->ifa_index);
3261
1b29fc2c
TG		 3262 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3263 err = -EADDRNOTAVAIL;
3264 goto errout;
3265 }
6c223828 3266
0ab6803b 3267 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3268 err = -ENOBUFS;
1b29fc2c 3269 goto errout_ifa;
6c223828
NT		 3270 }
3271
6c223828
NT		 3272 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3273 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3274 if (err < 0) {
3275 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3276 WARN_ON(err == -EMSGSIZE);
3277 kfree_skb(skb);
3278 goto errout_ifa;
3279 }
2942e900 3280 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3281errout_ifa:
6c223828 3282 in6_ifa_put(ifa);
1b29fc2c 3283errout:
6c223828 3284 return err;
6c223828
NT		 3285}
3286
1da177e4
LT		 3287static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3288{
3289 struct sk_buff *skb;
5d620266 3290 int err = -ENOBUFS;
1da177e4 3291
0ab6803b 3292 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3293 if (skb == NULL)
3294 goto errout;
3295
3296 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3297 if (err < 0) {
3298 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3299 WARN_ON(err == -EMSGSIZE);
3300 kfree_skb(skb);
3301 goto errout;
3302 }
5d620266
TG		 3303 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3304errout:
3305 if (err < 0)
3306 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3307}
3308
3309static void inline ipv6_store_devconf(struct ipv6_devconf *cnf,
3310 __s32 *array, int bytes)
3311{
04561c1f
TG		 3312 BUG_ON(bytes < (DEVCONF_MAX * 4));
3313
1da177e4
LT		 3314 memset(array, 0, bytes);
3315 array[DEVCONF_FORWARDING] = cnf->forwarding;
3316 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3317 array[DEVCONF_MTU6] = cnf->mtu6;
3318 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3319 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3320 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3321 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3322 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3323 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3324 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3325 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3326#ifdef CONFIG_IPV6_PRIVACY
3327 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3328 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3329 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3330 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3331 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3332#endif
3333 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3334 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3335 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3336#ifdef CONFIG_IPV6_ROUTER_PREF
3337 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3338 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3339#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3340 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3341#endif
930d6ff2 3342#endif
fbea49e1 3343 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
1da177e4
LT		 3344}
3345
339bf98f
TG		 3346static inline size_t inet6_if_nlmsg_size(void)
3347{
3348 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3349 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3350 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3351 + nla_total_size(4) /* IFLA_MTU */
3352 + nla_total_size(4) /* IFLA_LINK */
3353 + nla_total_size( /* IFLA_PROTINFO */
3354 nla_total_size(4) /* IFLA_INET6_FLAGS */
3355 + nla_total_size(sizeof(struct ifla_cacheinfo))
3356 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3357 );
3358}
c5396a31 3359
1ab1457c 3360static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3361 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3362{
04561c1f
TG		 3363 struct net_device *dev = idev->dev;
3364 struct nlattr *conf;
3365 struct ifinfomsg *hdr;
3366 struct nlmsghdr *nlh;
3367 void *protoinfo;
3368 struct ifla_cacheinfo ci;
3369
3370 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3371 if (nlh == NULL)
26932566 3372 return -EMSGSIZE;
04561c1f
TG		 3373
3374 hdr = nlmsg_data(nlh);
3375 hdr->ifi_family = AF_INET6;
3376 hdr->__ifi_pad = 0;
3377 hdr->ifi_type = dev->type;
3378 hdr->ifi_index = dev->ifindex;
3379 hdr->ifi_flags = dev_get_flags(dev);
3380 hdr->ifi_change = 0;
3381
3382 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3383
3384 if (dev->addr_len)
04561c1f 3385 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3386
04561c1f 3387 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3388 if (dev->ifindex != dev->iflink)
04561c1f 3389 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3390
04561c1f
TG		 3391 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3392 if (protoinfo == NULL)
3393 goto nla_put_failure;
1da177e4 3394
04561c1f 3395 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3396
1da177e4
LT		 3397 ci.max_reasm_len = IPV6_MAXPLEN;
3398 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3399 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3400 ci.reachable_time = idev->nd_parms->reachable_time;
3401 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3402 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3403
3404 conf = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3405 if (conf == NULL)
3406 goto nla_put_failure;
3407 ipv6_store_devconf(&idev->cnf, nla_data(conf), nla_len(conf));
1da177e4
LT		 3408
3409 /* XXX - Statistics/MC not implemented */
1da177e4 3410
04561c1f
TG		 3411 nla_nest_end(skb, protoinfo);
3412 return nlmsg_end(skb, nlh);
1da177e4 3413
04561c1f 3414nla_put_failure:
26932566
PM		 3415 nlmsg_cancel(skb, nlh);
3416 return -EMSGSIZE;
1da177e4
LT		 3417}
3418
3419static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3420{
3421 int idx, err;
3422 int s_idx = cb->args[0];
3423 struct net_device *dev;
3424 struct inet6_dev *idev;
3425
3426 read_lock(&dev_base_lock);
3427 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3428 if (idx < s_idx)
3429 continue;
3430 if ((idev = in6_dev_get(dev)) == NULL)
3431 continue;
1ab1457c 3432 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3433 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3434 in6_dev_put(idev);
3435 if (err <= 0)
3436 break;
3437 }
3438 read_unlock(&dev_base_lock);
3439 cb->args[0] = idx;
3440
3441 return skb->len;
3442}
3443
3444void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3445{
3446 struct sk_buff *skb;
8d7a76c9 3447 int err = -ENOBUFS;
1ab1457c 3448
339bf98f 3449 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3450 if (skb == NULL)
3451 goto errout;
3452
3453 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3454 if (err < 0) {
3455 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3456 WARN_ON(err == -EMSGSIZE);
3457 kfree_skb(skb);
3458 goto errout;
3459 }
8d7a76c9
TG		 3460 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3461errout:
3462 if (err < 0)
3463 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3464}
3465
339bf98f
TG		 3466static inline size_t inet6_prefix_nlmsg_size(void)
3467{
3468 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3469 + nla_total_size(sizeof(struct in6_addr))
3470 + nla_total_size(sizeof(struct prefix_cacheinfo));
3471}
c5396a31 3472
1da177e4 3473static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3474 struct prefix_info *pinfo, u32 pid, u32 seq,
3475 int event, unsigned int flags)
1da177e4 3476{
6051e2f4
TG		 3477 struct prefixmsg *pmsg;
3478 struct nlmsghdr *nlh;
1da177e4
LT		 3479 struct prefix_cacheinfo ci;
3480
6051e2f4
TG		 3481 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3482 if (nlh == NULL)
26932566 3483 return -EMSGSIZE;
6051e2f4
TG		 3484
3485 pmsg = nlmsg_data(nlh);
1da177e4 3486 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3487 pmsg->prefix_pad1 = 0;
3488 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3489 pmsg->prefix_ifindex = idev->dev->ifindex;
3490 pmsg->prefix_len = pinfo->prefix_len;
3491 pmsg->prefix_type = pinfo->type;
8a47077a 3492 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3493 pmsg->prefix_flags = 0;
3494 if (pinfo->onlink)
3495 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3496 if (pinfo->autoconf)
3497 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3498
6051e2f4 3499 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3500
3501 ci.preferred_time = ntohl(pinfo->prefered);
3502 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3503 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3504
6051e2f4 3505 return nlmsg_end(skb, nlh);
1da177e4 3506
6051e2f4 3507nla_put_failure:
26932566
PM		 3508 nlmsg_cancel(skb, nlh);
3509 return -EMSGSIZE;
1da177e4
LT		 3510}
3511
1ab1457c 3512static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3513 struct prefix_info *pinfo)
3514{
3515 struct sk_buff *skb;
8c384bfa 3516 int err = -ENOBUFS;
1da177e4 3517
339bf98f 3518 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3519 if (skb == NULL)
3520 goto errout;
3521
3522 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3523 if (err < 0) {
3524 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3525 WARN_ON(err == -EMSGSIZE);
3526 kfree_skb(skb);
3527 goto errout;
3528 }
8c384bfa
TG		 3529 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3530errout:
3531 if (err < 0)
3532 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3533}
3534
db46edc6 3535static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = {
1da177e4
LT		 3536 [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, },
3537 [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, },
3538 [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, },
6c223828
NT		 3539 [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr,
3540 .dumpit = inet6_dump_ifaddr, },
1da177e4
LT		 3541 [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, },
3542 [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, },
3543 [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, },
3544 [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, },
3545 [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute,
3546 .dumpit = inet6_dump_fib, },
8423a9aa 3547#ifdef CONFIG_IPV6_MULTIPLE_TABLES
101367c2 3548 [RTM_GETRULE - RTM_BASE] = { .dumpit = fib6_rules_dump, },
8423a9aa 3549#endif
1da177e4
LT		 3550};
3551
3552static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3553{
3554 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3555
3556 switch (event) {
3557 case RTM_NEWADDR:
40e22e8f 3558 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3559 if (ifp->idev->cnf.forwarding)
3560 addrconf_join_anycast(ifp);
3561 break;
3562 case RTM_DELADDR:
3563 if (ifp->idev->cnf.forwarding)
3564 addrconf_leave_anycast(ifp);
3565 addrconf_leave_solict(ifp->idev, &ifp->addr);
3566 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3567 if (ip6_del_rt(ifp->rt))
1da177e4 3568 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3569 break;
3570 }
3571}
3572
3573static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3574{
8814c4b5 3575 rcu_read_lock_bh();
1da177e4
LT		 3576 if (likely(ifp->idev->dead == 0))
3577 __ipv6_ifa_notify(event, ifp);
8814c4b5 3578 rcu_read_unlock_bh();
1da177e4
LT		 3579}
3580
3581#ifdef CONFIG_SYSCTL
3582
3583static
3584int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3585 void __user *buffer, size_t *lenp, loff_t *ppos)
3586{
3587 int *valp = ctl->data;
3588 int val = *valp;
3589 int ret;
3590
3591 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3592
3593 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3594 if (valp != &ipv6_devconf.forwarding) {
3595 if ((!*valp) ^ (!val)) {
3596 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3597 if (idev == NULL)
3598 return ret;
3599 dev_forward_change(idev);
3600 }
3601 } else {
3602 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3603 addrconf_forward_change();
3604 }
3605 if (*valp)
3606 rt6_purge_dflt_routers();
3607 }
3608
1ab1457c 3609 return ret;
1da177e4
LT		 3610}
3611
1ab1457c 3612static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3613 int __user *name, int nlen,
3614 void __user *oldval,
3615 size_t __user *oldlenp,
1f29bcd7 3616 void __user *newval, size_t newlen)
1da177e4
LT		 3617{
3618 int *valp = table->data;
3619 int new;
3620
3621 if (!newval || !newlen)
3622 return 0;
3623 if (newlen != sizeof(int))
3624 return -EINVAL;
3625 if (get_user(new, (int __user *)newval))
3626 return -EFAULT;
3627 if (new == *valp)
3628 return 0;
3629 if (oldval && oldlenp) {
3630 size_t len;
3631 if (get_user(len, oldlenp))
3632 return -EFAULT;
3633 if (len) {
3634 if (len > table->maxlen)
3635 len = table->maxlen;
3636 if (copy_to_user(oldval, valp, len))
3637 return -EFAULT;
3638 if (put_user(len, oldlenp))
3639 return -EFAULT;
3640 }
3641 }
3642
3643 if (valp != &ipv6_devconf_dflt.forwarding) {
3644 if (valp != &ipv6_devconf.forwarding) {
3645 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3646 int changed;
3647 if (unlikely(idev == NULL))
3648 return -ENODEV;
3649 changed = (!*valp) ^ (!new);
3650 *valp = new;
3651 if (changed)
3652 dev_forward_change(idev);
3653 } else {
3654 *valp = new;
3655 addrconf_forward_change();
3656 }
3657
3658 if (*valp)
3659 rt6_purge_dflt_routers();
3660 } else
3661 *valp = new;
3662
3663 return 1;
3664}
3665
3666static struct addrconf_sysctl_table
3667{
3668 struct ctl_table_header *sysctl_header;
3669 ctl_table addrconf_vars[__NET_IPV6_MAX];
3670 ctl_table addrconf_dev[2];
3671 ctl_table addrconf_conf_dir[2];
3672 ctl_table addrconf_proto_dir[2];
3673 ctl_table addrconf_root_dir[2];
ab32ea5d 3674} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3675 .sysctl_header = NULL,
3676 .addrconf_vars = {
1ab1457c 3677 {
1da177e4
LT		 3678 .ctl_name = NET_IPV6_FORWARDING,
3679 .procname = "forwarding",
1ab1457c 3680 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3681 .maxlen = sizeof(int),
3682 .mode = 0644,
1ab1457c 3683 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3684 .strategy = &addrconf_sysctl_forward_strategy,
3685 },
3686 {
3687 .ctl_name = NET_IPV6_HOP_LIMIT,
3688 .procname = "hop_limit",
1ab1457c 3689 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3690 .maxlen = sizeof(int),
3691 .mode = 0644,
3692 .proc_handler = proc_dointvec,
3693 },
3694 {
3695 .ctl_name = NET_IPV6_MTU,
3696 .procname = "mtu",
3697 .data = &ipv6_devconf.mtu6,
1ab1457c 3698 .maxlen = sizeof(int),
1da177e4 3699 .mode = 0644,
1ab1457c 3700 .proc_handler = &proc_dointvec,
1da177e4
LT		 3701 },
3702 {
3703 .ctl_name = NET_IPV6_ACCEPT_RA,
3704 .procname = "accept_ra",
1ab1457c 3705 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3706 .maxlen = sizeof(int),
3707 .mode = 0644,
1ab1457c 3708 .proc_handler = &proc_dointvec,
1da177e4
LT		 3709 },
3710 {
3711 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3712 .procname = "accept_redirects",
1ab1457c 3713 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3714 .maxlen = sizeof(int),
3715 .mode = 0644,
1ab1457c 3716 .proc_handler = &proc_dointvec,
1da177e4
LT		 3717 },
3718 {
3719 .ctl_name = NET_IPV6_AUTOCONF,
3720 .procname = "autoconf",
1ab1457c 3721 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3722 .maxlen = sizeof(int),
3723 .mode = 0644,
1ab1457c 3724 .proc_handler = &proc_dointvec,
1da177e4
LT		 3725 },
3726 {
3727 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3728 .procname = "dad_transmits",
1ab1457c 3729 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3730 .maxlen = sizeof(int),
3731 .mode = 0644,
1ab1457c 3732 .proc_handler = &proc_dointvec,
1da177e4
LT		 3733 },
3734 {
3735 .ctl_name = NET_IPV6_RTR_SOLICITS,
3736 .procname = "router_solicitations",
1ab1457c 3737 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3738 .maxlen = sizeof(int),
3739 .mode = 0644,
1ab1457c 3740 .proc_handler = &proc_dointvec,
1da177e4
LT		 3741 },
3742 {
3743 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3744 .procname = "router_solicitation_interval",
1ab1457c 3745 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3746 .maxlen = sizeof(int),
3747 .mode = 0644,
1ab1457c 3748 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3749 .strategy = &sysctl_jiffies,
3750 },
3751 {
3752 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3753 .procname = "router_solicitation_delay",
1ab1457c 3754 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3755 .maxlen = sizeof(int),
3756 .mode = 0644,
1ab1457c 3757 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3758 .strategy = &sysctl_jiffies,
3759 },
3760 {
3761 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3762 .procname = "force_mld_version",
1ab1457c 3763 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3764 .maxlen = sizeof(int),
3765 .mode = 0644,
1ab1457c 3766 .proc_handler = &proc_dointvec,
1da177e4
LT		 3767 },
3768#ifdef CONFIG_IPV6_PRIVACY
3769 {
3770 .ctl_name = NET_IPV6_USE_TEMPADDR,
3771 .procname = "use_tempaddr",
1ab1457c 3772 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3773 .maxlen = sizeof(int),
3774 .mode = 0644,
1ab1457c 3775 .proc_handler = &proc_dointvec,
1da177e4
LT		 3776 },
3777 {
3778 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3779 .procname = "temp_valid_lft",
1ab1457c 3780 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3781 .maxlen = sizeof(int),
3782 .mode = 0644,
1ab1457c 3783 .proc_handler = &proc_dointvec,
1da177e4
LT		 3784 },
3785 {
3786 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3787 .procname = "temp_prefered_lft",
1ab1457c 3788 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3789 .maxlen = sizeof(int),
3790 .mode = 0644,
1ab1457c 3791 .proc_handler = &proc_dointvec,
1da177e4
LT		 3792 },
3793 {
3794 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3795 .procname = "regen_max_retry",
1ab1457c 3796 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3797 .maxlen = sizeof(int),
3798 .mode = 0644,
1ab1457c 3799 .proc_handler = &proc_dointvec,
1da177e4
LT		 3800 },
3801 {
3802 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3803 .procname = "max_desync_factor",
1ab1457c 3804 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3805 .maxlen = sizeof(int),
3806 .mode = 0644,
1ab1457c 3807 .proc_handler = &proc_dointvec,
1da177e4
LT		 3808 },
3809#endif
3810 {
3811 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3812 .procname = "max_addresses",
3813 .data = &ipv6_devconf.max_addresses,
3814 .maxlen = sizeof(int),
3815 .mode = 0644,
3816 .proc_handler = &proc_dointvec,
3817 },
65f5c7c1
YH		 3818 {
3819 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3820 .procname = "accept_ra_defrtr",
1ab1457c 3821 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3822 .maxlen = sizeof(int),
3823 .mode = 0644,
1ab1457c 3824 .proc_handler = &proc_dointvec,
65f5c7c1 3825 },
c4fd30eb
YH		 3826 {
3827 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3828 .procname = "accept_ra_pinfo",
1ab1457c 3829 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3830 .maxlen = sizeof(int),
3831 .mode = 0644,
1ab1457c 3832 .proc_handler = &proc_dointvec,
c4fd30eb 3833 },
930d6ff2
YH		 3834#ifdef CONFIG_IPV6_ROUTER_PREF
3835 {
3836 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3837 .procname = "accept_ra_rtr_pref",
3838 .data = &ipv6_devconf.accept_ra_rtr_pref,
3839 .maxlen = sizeof(int),
3840 .mode = 0644,
3841 .proc_handler = &proc_dointvec,
3842 },
52e16356
YH		 3843 {
3844 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3845 .procname = "router_probe_interval",
3846 .data = &ipv6_devconf.rtr_probe_interval,
3847 .maxlen = sizeof(int),
3848 .mode = 0644,
3849 .proc_handler = &proc_dointvec_jiffies,
3850 .strategy = &sysctl_jiffies,
3851 },
fa03ef38 3852#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3853 {
3854 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3855 .procname = "accept_ra_rt_info_max_plen",
3856 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3857 .maxlen = sizeof(int),
3858 .mode = 0644,
3859 .proc_handler = &proc_dointvec,
3860 },
3861#endif
930d6ff2 3862#endif
fbea49e1
YH		 3863 {
3864 .ctl_name = NET_IPV6_PROXY_NDP,
3865 .procname = "proxy_ndp",
3866 .data = &ipv6_devconf.proxy_ndp,
3867 .maxlen = sizeof(int),
3868 .mode = 0644,
3869 .proc_handler = &proc_dointvec,
3870 },
1da177e4
LT		 3871 {
3872 .ctl_name = 0, /* sentinel */
3873 }
3874 },
3875 .addrconf_dev = {
3876 {
3877 .ctl_name = NET_PROTO_CONF_ALL,
3878 .procname = "all",
3879 .mode = 0555,
3880 .child = addrconf_sysctl.addrconf_vars,
3881 },
3882 {
3883 .ctl_name = 0, /* sentinel */
3884 }
3885 },
3886 .addrconf_conf_dir = {
3887 {
3888 .ctl_name = NET_IPV6_CONF,
3889 .procname = "conf",
3890 .mode = 0555,
3891 .child = addrconf_sysctl.addrconf_dev,
3892 },
3893 {
3894 .ctl_name = 0, /* sentinel */
3895 }
3896 },
3897 .addrconf_proto_dir = {
3898 {
3899 .ctl_name = NET_IPV6,
3900 .procname = "ipv6",
3901 .mode = 0555,
3902 .child = addrconf_sysctl.addrconf_conf_dir,
3903 },
3904 {
3905 .ctl_name = 0, /* sentinel */
3906 }
3907 },
3908 .addrconf_root_dir = {
3909 {
3910 .ctl_name = CTL_NET,
3911 .procname = "net",
3912 .mode = 0555,
3913 .child = addrconf_sysctl.addrconf_proto_dir,
3914 },
3915 {
3916 .ctl_name = 0, /* sentinel */
3917 }
3918 },
3919};
3920
3921static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
3922{
3923 int i;
3924 struct net_device *dev = idev ? idev->dev : NULL;
3925 struct addrconf_sysctl_table *t;
3926 char *dev_name = NULL;
3927
af879cc7 3928 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 3929 if (t == NULL)
3930 return;
1da177e4
LT		 3931 for (i=0; t->addrconf_vars[i].data; i++) {
3932 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 3933 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
3934 }
3935 if (dev) {
1ab1457c 3936 dev_name = dev->name;
1da177e4
LT		 3937 t->addrconf_dev[0].ctl_name = dev->ifindex;
3938 } else {
3939 dev_name = "default";
3940 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
3941 }
3942
1ab1457c
YH		 3943 /*
3944 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 3945 * by sysctl and we wouldn't want anyone to change it under our feet
3946 * (see SIOCSIFNAME).
1ab1457c 3947 */
543537bd 3948 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 3949 if (!dev_name)
3950 goto free;
3951
3952 t->addrconf_dev[0].procname = dev_name;
3953
3954 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 3955 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 3956 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 3957 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 3958
0b4d4147 3959 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 3960 if (t->sysctl_header == NULL)
3961 goto free_procname;
3962 else
3963 p->sysctl = t;
3964 return;
3965
3966 /* error path */
3967 free_procname:
3968 kfree(dev_name);
3969 free:
3970 kfree(t);
3971
3972 return;
3973}
3974
3975static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
3976{
3977 if (p->sysctl) {
3978 struct addrconf_sysctl_table *t = p->sysctl;
3979 p->sysctl = NULL;
3980 unregister_sysctl_table(t->sysctl_header);
3981 kfree(t->addrconf_dev[0].procname);
3982 kfree(t);
3983 }
3984}
3985
3986
3987#endif
3988
3989/*
3990 * Device notifier
3991 */
3992
3993int register_inet6addr_notifier(struct notifier_block *nb)
3994{
1ab1457c 3995 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 3996}
3997
3998int unregister_inet6addr_notifier(struct notifier_block *nb)
3999{
1ab1457c 4000 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4001}
4002
4003/*
4004 * Init / cleanup code
4005 */
4006
4007int __init addrconf_init(void)
4008{
4009 int err = 0;
4010
4011 /* The addrconf netdev notifier requires that loopback_dev
4012 * has it's ipv6 private information allocated and setup
4013 * before it can bring up and give link-local addresses
4014 * to other devices which are up.
4015 *
4016 * Unfortunately, loopback_dev is not necessarily the first
4017 * entry in the global dev_base list of net devices. In fact,
4018 * it is likely to be the very last entry on that list.
4019 * So this causes the notifier registry below to try and
4020 * give link-local addresses to all devices besides loopback_dev
4021 * first, then loopback_dev, which cases all the non-loopback_dev
4022 * devices to fail to get a link-local address.
4023 *
4024 * So, as a temporary fix, allocate the ipv6 structure for
4025 * loopback_dev first by hand.
4026 * Longer term, all of the dependencies ipv6 has upon the loopback
4027 * device and it being up should be removed.
4028 */
4029 rtnl_lock();
4030 if (!ipv6_add_dev(&loopback_dev))
4031 err = -ENOMEM;
4032 rtnl_unlock();
4033 if (err)
4034 return err;
4035
c62dba90
HX		 4036 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4037
1da177e4
LT		 4038 register_netdevice_notifier(&ipv6_dev_notf);
4039
1da177e4
LT		 4040 addrconf_verify(0);
4041 rtnetlink_links[PF_INET6] = inet6_rtnetlink_table;
4042#ifdef CONFIG_SYSCTL
4043 addrconf_sysctl.sysctl_header =
0b4d4147 4044 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4045 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4046#endif
4047
4048 return 0;
4049}
4050
4051void __exit addrconf_cleanup(void)
4052{
1ab1457c
YH		 4053 struct net_device *dev;
4054 struct inet6_dev *idev;
4055 struct inet6_ifaddr *ifa;
1da177e4
LT		 4056 int i;
4057
4058 unregister_netdevice_notifier(&ipv6_dev_notf);
4059
4060 rtnetlink_links[PF_INET6] = NULL;
4061#ifdef CONFIG_SYSCTL
4062 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4063 addrconf_sysctl_unregister(&ipv6_devconf);
4064#endif
4065
4066 rtnl_lock();
4067
4068 /*
4069 * clean dev list.
4070 */
4071
4072 for (dev=dev_base; dev; dev=dev->next) {
4073 if ((idev = __in6_dev_get(dev)) == NULL)
4074 continue;
4075 addrconf_ifdown(dev, 1);
4076 }
4077 addrconf_ifdown(&loopback_dev, 2);
4078
4079 /*
4080 * Check hash table.
4081 */
4082
4083 write_lock_bh(&addrconf_hash_lock);
4084 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4085 for (ifa=inet6_addr_lst[i]; ifa; ) {
4086 struct inet6_ifaddr *bifa;
4087
4088 bifa = ifa;
4089 ifa = ifa->lst_next;
4090 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4091 /* Do not free it; something is wrong.
4092 Now we can investigate it with debugger.
4093 */
4094 }
4095 }
4096 write_unlock_bh(&addrconf_hash_lock);
4097
4098 del_timer(&addr_chk_timer);
4099
4100 rtnl_unlock();
4101
1da177e4
LT		 4102#ifdef CONFIG_PROC_FS
4103 proc_net_remove("if_inet6");
4104#endif
4105}
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