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[SCTP]: Fix sctp_getsockopt_local_addrs_old() to use local storage.
[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>
7f7d9a6b 84#include <asm/unaligned.h>
1da177e4
LT		 85
86#include <linux/proc_fs.h>
87#include <linux/seq_file.h>
88
89/* Set to 3 to get tracing... */
90#define ACONF_DEBUG 2
91
92#if ACONF_DEBUG >= 3
93#define ADBG(x) printk x
94#else
95#define ADBG(x)
96#endif
97
98#define INFINITY_LIFE_TIME 0xFFFFFFFF
99#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101#ifdef CONFIG_SYSCTL
102static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
103static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
104#endif
105
106#ifdef CONFIG_IPV6_PRIVACY
107static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 108static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 109static void ipv6_regen_rndid(unsigned long data);
110
111static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 112#endif
113
114static int ipv6_count_addresses(struct inet6_dev *idev);
115
116/*
117 * Configured unicast address hash table
118 */
119static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
120static DEFINE_RWLOCK(addrconf_hash_lock);
121
1da177e4
LT		 122static void addrconf_verify(unsigned long);
123
8d06afab 124static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 125static DEFINE_SPINLOCK(addrconf_verify_lock);
126
127static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
128static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
129
130static int addrconf_ifdown(struct net_device *dev, int how);
131
e431b8c0 132static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 133static void addrconf_dad_timer(unsigned long data);
134static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 135static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 136static void addrconf_rs_timer(unsigned long data);
137static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139
1ab1457c 140static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 141 struct prefix_info *pinfo);
142static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
143
e041c683 144static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 145
ab32ea5d 146struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 147 .forwarding = 0,
148 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
149 .mtu6 = IPV6_MIN_MTU,
150 .accept_ra = 1,
151 .accept_redirects = 1,
152 .autoconf = 1,
153 .force_mld_version = 0,
154 .dad_transmits = 1,
155 .rtr_solicits = MAX_RTR_SOLICITATIONS,
156 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
157 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
158#ifdef CONFIG_IPV6_PRIVACY
159 .use_tempaddr = 0,
160 .temp_valid_lft = TEMP_VALID_LIFETIME,
161 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
162 .regen_max_retry = REGEN_MAX_RETRY,
163 .max_desync_factor = MAX_DESYNC_FACTOR,
164#endif
165 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 166 .accept_ra_defrtr = 1,
c4fd30eb 167 .accept_ra_pinfo = 1,
930d6ff2
YH		 168#ifdef CONFIG_IPV6_ROUTER_PREF
169 .accept_ra_rtr_pref = 1,
52e16356 170 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 171#ifdef CONFIG_IPV6_ROUTE_INFO
172 .accept_ra_rt_info_max_plen = 0,
173#endif
930d6ff2 174#endif
fbea49e1 175 .proxy_ndp = 0,
0bcbc926 176 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 177};
178
ab32ea5d 179static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190#ifdef CONFIG_IPV6_PRIVACY
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196#endif
197 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 198 .accept_ra_defrtr = 1,
c4fd30eb 199 .accept_ra_pinfo = 1,
930d6ff2
YH		 200#ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
52e16356 202 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 203#ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205#endif
930d6ff2 206#endif
fbea49e1 207 .proxy_ndp = 0,
0bcbc926 208 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 209};
210
211/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 212const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 213const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
214
1da177e4
LT		 215static void addrconf_del_timer(struct inet6_ifaddr *ifp)
216{
217 if (del_timer(&ifp->timer))
218 __in6_ifa_put(ifp);
219}
220
221enum addrconf_timer_t
222{
223 AC_NONE,
224 AC_DAD,
225 AC_RS,
226};
227
228static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
229 enum addrconf_timer_t what,
230 unsigned long when)
231{
232 if (!del_timer(&ifp->timer))
233 in6_ifa_hold(ifp);
234
235 switch (what) {
236 case AC_DAD:
237 ifp->timer.function = addrconf_dad_timer;
238 break;
239 case AC_RS:
240 ifp->timer.function = addrconf_rs_timer;
241 break;
242 default:;
243 }
244 ifp->timer.expires = jiffies + when;
245 add_timer(&ifp->timer);
246}
247
7f7d9a6b
HX		 248static int snmp6_alloc_dev(struct inet6_dev *idev)
249{
250 int err = -ENOMEM;
251
252 if (!idev || !idev->dev)
253 return -EINVAL;
254
255 if (snmp_mib_init((void **)idev->stats.ipv6,
256 sizeof(struct ipstats_mib),
257 __alignof__(struct ipstats_mib)) < 0)
258 goto err_ip;
259 if (snmp_mib_init((void **)idev->stats.icmpv6,
260 sizeof(struct icmpv6_mib),
261 __alignof__(struct icmpv6_mib)) < 0)
262 goto err_icmp;
263
264 return 0;
265
266err_icmp:
267 snmp_mib_free((void **)idev->stats.ipv6);
268err_ip:
269 return err;
270}
271
272static int snmp6_free_dev(struct inet6_dev *idev)
273{
274 snmp_mib_free((void **)idev->stats.icmpv6);
275 snmp_mib_free((void **)idev->stats.ipv6);
276 return 0;
277}
278
1da177e4
LT		 279/* Nobody refers to this device, we may destroy it. */
280
8814c4b5
YH		 281static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
282{
283 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
284 kfree(idev);
285}
286
1da177e4
LT		 287void in6_dev_finish_destroy(struct inet6_dev *idev)
288{
289 struct net_device *dev = idev->dev;
290 BUG_TRAP(idev->addr_list==NULL);
291 BUG_TRAP(idev->mc_list==NULL);
292#ifdef NET_REFCNT_DEBUG
293 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
294#endif
295 dev_put(dev);
296 if (!idev->dead) {
297 printk("Freeing alive inet6 device %p\n", idev);
298 return;
299 }
300 snmp6_free_dev(idev);
8814c4b5 301 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 302}
303
7159039a
YH		 304EXPORT_SYMBOL(in6_dev_finish_destroy);
305
1da177e4
LT		 306static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
307{
308 struct inet6_dev *ndev;
d88ae4cc 309 struct in6_addr maddr;
1da177e4
LT		 310
311 ASSERT_RTNL();
312
313 if (dev->mtu < IPV6_MIN_MTU)
314 return NULL;
315
1ab1457c 316 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 317
1ab1457c
YH		 318 if (ndev == NULL)
319 return NULL;
322f74a4
IO		 320
321 rwlock_init(&ndev->lock);
322 ndev->dev = dev;
323 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
324 ndev->cnf.mtu6 = dev->mtu;
325 ndev->cnf.sysctl = NULL;
326 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
327 if (ndev->nd_parms == NULL) {
328 kfree(ndev);
329 return NULL;
330 }
331 /* We refer to the device */
332 dev_hold(dev);
1da177e4 333
322f74a4
IO		 334 if (snmp6_alloc_dev(ndev) < 0) {
335 ADBG((KERN_WARNING
336 "%s(): cannot allocate memory for statistics; dev=%s.\n",
337 __FUNCTION__, dev->name));
338 neigh_parms_release(&nd_tbl, ndev->nd_parms);
339 ndev->dead = 1;
340 in6_dev_finish_destroy(ndev);
341 return NULL;
342 }
1da177e4 343
322f74a4
IO		 344 if (snmp6_register_dev(ndev) < 0) {
345 ADBG((KERN_WARNING
346 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
347 __FUNCTION__, dev->name));
348 neigh_parms_release(&nd_tbl, ndev->nd_parms);
349 ndev->dead = 1;
350 in6_dev_finish_destroy(ndev);
351 return NULL;
352 }
353
354 /* One reference from device. We must do this before
355 * we invoke __ipv6_regen_rndid().
356 */
357 in6_dev_hold(ndev);
1da177e4
LT		 358
359#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 360 init_timer(&ndev->regen_timer);
361 ndev->regen_timer.function = ipv6_regen_rndid;
362 ndev->regen_timer.data = (unsigned long) ndev;
363 if ((dev->flags&IFF_LOOPBACK) ||
364 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 365#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
366 dev->type == ARPHRD_SIT ||
367#endif
368 dev->type == ARPHRD_NONE) {
322f74a4
IO		 369 printk(KERN_INFO
370 "%s: Disabled Privacy Extensions\n",
371 dev->name);
372 ndev->cnf.use_tempaddr = -1;
373 } else {
374 in6_dev_hold(ndev);
375 ipv6_regen_rndid((unsigned long) ndev);
376 }
1da177e4
LT		 377#endif
378
53aadcc9
HX		 379 if (netif_running(dev) && netif_carrier_ok(dev))
380 ndev->if_flags |= IF_READY;
381
322f74a4
IO		 382 ipv6_mc_init_dev(ndev);
383 ndev->tstamp = jiffies;
1da177e4 384#ifdef CONFIG_SYSCTL
322f74a4
IO		 385 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
386 NET_IPV6_NEIGH, "ipv6",
387 &ndisc_ifinfo_sysctl_change,
388 NULL);
389 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 390#endif
30c4cf57
DS		 391 /* protected by rtnl_lock */
392 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 393
394 /* Join all-node multicast group */
395 ipv6_addr_all_nodes(&maddr);
396 ipv6_dev_mc_inc(dev, &maddr);
397
1da177e4
LT		 398 return ndev;
399}
400
401static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
402{
403 struct inet6_dev *idev;
404
405 ASSERT_RTNL();
406
407 if ((idev = __in6_dev_get(dev)) == NULL) {
408 if ((idev = ipv6_add_dev(dev)) == NULL)
409 return NULL;
410 }
c5e33bdd 411
1da177e4
LT		 412 if (dev->flags&IFF_UP)
413 ipv6_mc_up(idev);
414 return idev;
415}
416
417#ifdef CONFIG_SYSCTL
418static void dev_forward_change(struct inet6_dev *idev)
419{
420 struct net_device *dev;
421 struct inet6_ifaddr *ifa;
422 struct in6_addr addr;
423
424 if (!idev)
425 return;
426 dev = idev->dev;
427 if (dev && (dev->flags & IFF_MULTICAST)) {
428 ipv6_addr_all_routers(&addr);
1ab1457c 429
1da177e4
LT		 430 if (idev->cnf.forwarding)
431 ipv6_dev_mc_inc(dev, &addr);
432 else
433 ipv6_dev_mc_dec(dev, &addr);
434 }
435 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 436 if (ifa->flags&IFA_F_TENTATIVE)
437 continue;
1da177e4
LT		 438 if (idev->cnf.forwarding)
439 addrconf_join_anycast(ifa);
440 else
441 addrconf_leave_anycast(ifa);
442 }
443}
444
445
446static void addrconf_forward_change(void)
447{
448 struct net_device *dev;
449 struct inet6_dev *idev;
450
451 read_lock(&dev_base_lock);
452 for (dev=dev_base; dev; dev=dev->next) {
8814c4b5 453 rcu_read_lock();
1da177e4
LT		 454 idev = __in6_dev_get(dev);
455 if (idev) {
456 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
457 idev->cnf.forwarding = ipv6_devconf.forwarding;
458 if (changed)
459 dev_forward_change(idev);
460 }
8814c4b5 461 rcu_read_unlock();
1da177e4
LT		 462 }
463 read_unlock(&dev_base_lock);
464}
465#endif
466
467/* Nobody refers to this ifaddr, destroy it */
468
469void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
470{
471 BUG_TRAP(ifp->if_next==NULL);
472 BUG_TRAP(ifp->lst_next==NULL);
473#ifdef NET_REFCNT_DEBUG
474 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
475#endif
476
477 in6_dev_put(ifp->idev);
478
479 if (del_timer(&ifp->timer))
480 printk("Timer is still running, when freeing ifa=%p\n", ifp);
481
482 if (!ifp->dead) {
483 printk("Freeing alive inet6 address %p\n", ifp);
484 return;
485 }
486 dst_release(&ifp->rt->u.dst);
487
488 kfree(ifp);
489}
490
e55ffac6
BH		 491static void
492ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
493{
494 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 495 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 496
497 /*
498 * Each device address list is sorted in order of scope -
499 * global before linklocal.
500 */
501 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
502 ifap = &ifa->if_next) {
8a6ce0c0 503 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 504 break;
505 }
506
507 ifp->if_next = *ifap;
508 *ifap = ifp;
509}
510
1da177e4
LT		 511/* On success it returns ifp with increased reference count */
512
513static struct inet6_ifaddr *
514ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 515 int scope, u32 flags)
1da177e4
LT		 516{
517 struct inet6_ifaddr *ifa = NULL;
518 struct rt6_info *rt;
519 int hash;
520 int err = 0;
521
8814c4b5 522 rcu_read_lock_bh();
1da177e4
LT		 523 if (idev->dead) {
524 err = -ENODEV; /*XXX*/
525 goto out2;
526 }
527
528 write_lock(&addrconf_hash_lock);
529
530 /* Ignore adding duplicate addresses on an interface */
531 if (ipv6_chk_same_addr(addr, idev->dev)) {
532 ADBG(("ipv6_add_addr: already assigned\n"));
533 err = -EEXIST;
534 goto out;
535 }
536
322f74a4 537 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 538
539 if (ifa == NULL) {
540 ADBG(("ipv6_add_addr: malloc failed\n"));
541 err = -ENOBUFS;
542 goto out;
543 }
544
545 rt = addrconf_dst_alloc(idev, addr, 0);
546 if (IS_ERR(rt)) {
547 err = PTR_ERR(rt);
548 goto out;
549 }
550
1da177e4
LT		 551 ipv6_addr_copy(&ifa->addr, addr);
552
553 spin_lock_init(&ifa->lock);
554 init_timer(&ifa->timer);
555 ifa->timer.data = (unsigned long) ifa;
556 ifa->scope = scope;
557 ifa->prefix_len = pfxlen;
558 ifa->flags = flags | IFA_F_TENTATIVE;
559 ifa->cstamp = ifa->tstamp = jiffies;
560
57f5f544
KF		 561 ifa->rt = rt;
562
95c385b4
NH		 563 /*
564 * part one of RFC 4429, section 3.3
565 * We should not configure an address as
566 * optimistic if we do not yet know the link
567 * layer address of our nexhop router
568 */
569
570 if (rt->rt6i_nexthop == NULL)
571 ifa->flags &= ~IFA_F_OPTIMISTIC;
572
1da177e4
LT		 573 ifa->idev = idev;
574 in6_dev_hold(idev);
575 /* For caller */
576 in6_ifa_hold(ifa);
577
578 /* Add to big hash table */
579 hash = ipv6_addr_hash(addr);
580
581 ifa->lst_next = inet6_addr_lst[hash];
582 inet6_addr_lst[hash] = ifa;
583 in6_ifa_hold(ifa);
584 write_unlock(&addrconf_hash_lock);
585
586 write_lock(&idev->lock);
587 /* Add to inet6_dev unicast addr list. */
e55ffac6 588 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 589
590#ifdef CONFIG_IPV6_PRIVACY
591 if (ifa->flags&IFA_F_TEMPORARY) {
592 ifa->tmp_next = idev->tempaddr_list;
593 idev->tempaddr_list = ifa;
594 in6_ifa_hold(ifa);
595 }
596#endif
597
1da177e4
LT		 598 in6_ifa_hold(ifa);
599 write_unlock(&idev->lock);
600out2:
8814c4b5 601 rcu_read_unlock_bh();
1da177e4 602
fd92833a 603 if (likely(err == 0))
e041c683 604 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 605 else {
606 kfree(ifa);
607 ifa = ERR_PTR(err);
608 }
609
610 return ifa;
611out:
612 write_unlock(&addrconf_hash_lock);
613 goto out2;
614}
615
616/* This function wants to get referenced ifp and releases it before return */
617
618static void ipv6_del_addr(struct inet6_ifaddr *ifp)
619{
620 struct inet6_ifaddr *ifa, **ifap;
621 struct inet6_dev *idev = ifp->idev;
622 int hash;
623 int deleted = 0, onlink = 0;
624 unsigned long expires = jiffies;
625
626 hash = ipv6_addr_hash(&ifp->addr);
627
628 ifp->dead = 1;
629
630 write_lock_bh(&addrconf_hash_lock);
631 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
632 ifap = &ifa->lst_next) {
633 if (ifa == ifp) {
634 *ifap = ifa->lst_next;
635 __in6_ifa_put(ifp);
636 ifa->lst_next = NULL;
637 break;
638 }
639 }
640 write_unlock_bh(&addrconf_hash_lock);
641
642 write_lock_bh(&idev->lock);
643#ifdef CONFIG_IPV6_PRIVACY
644 if (ifp->flags&IFA_F_TEMPORARY) {
645 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
646 ifap = &ifa->tmp_next) {
647 if (ifa == ifp) {
648 *ifap = ifa->tmp_next;
649 if (ifp->ifpub) {
650 in6_ifa_put(ifp->ifpub);
651 ifp->ifpub = NULL;
652 }
653 __in6_ifa_put(ifp);
654 ifa->tmp_next = NULL;
655 break;
656 }
657 }
658 }
659#endif
660
1d142804 661 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 662 if (ifa == ifp) {
663 *ifap = ifa->if_next;
664 __in6_ifa_put(ifp);
665 ifa->if_next = NULL;
666 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
667 break;
668 deleted = 1;
1d142804 669 continue;
1da177e4
LT		 670 } else if (ifp->flags & IFA_F_PERMANENT) {
671 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
672 ifp->prefix_len)) {
673 if (ifa->flags & IFA_F_PERMANENT) {
674 onlink = 1;
675 if (deleted)
676 break;
677 } else {
678 unsigned long lifetime;
679
680 if (!onlink)
681 onlink = -1;
682
683 spin_lock(&ifa->lock);
684 lifetime = min_t(unsigned long,
685 ifa->valid_lft, 0x7fffffffUL/HZ);
686 if (time_before(expires,
687 ifa->tstamp + lifetime * HZ))
688 expires = ifa->tstamp + lifetime * HZ;
689 spin_unlock(&ifa->lock);
690 }
691 }
692 }
1d142804 693 ifap = &ifa->if_next;
1da177e4
LT		 694 }
695 write_unlock_bh(&idev->lock);
696
697 ipv6_ifa_notify(RTM_DELADDR, ifp);
698
e041c683 699 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 700
701 addrconf_del_timer(ifp);
702
703 /*
704 * Purge or update corresponding prefix
705 *
706 * 1) we don't purge prefix here if address was not permanent.
707 * prefix is managed by its own lifetime.
708 * 2) if there're no addresses, delete prefix.
709 * 3) if there're still other permanent address(es),
710 * corresponding prefix is still permanent.
711 * 4) otherwise, update prefix lifetime to the
712 * longest valid lifetime among the corresponding
713 * addresses on the device.
714 * Note: subsequent RA will update lifetime.
715 *
716 * --yoshfuji
717 */
718 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
719 struct in6_addr prefix;
720 struct rt6_info *rt;
721
722 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
723 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
724
725 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
726 if (onlink == 0) {
e0a1ad73 727 ip6_del_rt(rt);
1da177e4
LT		 728 rt = NULL;
729 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
730 rt->rt6i_expires = expires;
731 rt->rt6i_flags |= RTF_EXPIRES;
732 }
733 }
734 dst_release(&rt->u.dst);
735 }
736
737 in6_ifa_put(ifp);
738}
739
740#ifdef CONFIG_IPV6_PRIVACY
741static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
742{
743 struct inet6_dev *idev = ifp->idev;
744 struct in6_addr addr, *tmpaddr;
745 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
746 int tmp_plen;
747 int ret = 0;
748 int max_addresses;
95c385b4 749 u32 addr_flags;
1da177e4
LT		 750
751 write_lock(&idev->lock);
752 if (ift) {
753 spin_lock_bh(&ift->lock);
754 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
755 spin_unlock_bh(&ift->lock);
756 tmpaddr = &addr;
757 } else {
758 tmpaddr = NULL;
759 }
760retry:
761 in6_dev_hold(idev);
762 if (idev->cnf.use_tempaddr <= 0) {
763 write_unlock(&idev->lock);
764 printk(KERN_INFO
765 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
766 in6_dev_put(idev);
767 ret = -1;
768 goto out;
769 }
770 spin_lock_bh(&ifp->lock);
771 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
772 idev->cnf.use_tempaddr = -1; /*XXX*/
773 spin_unlock_bh(&ifp->lock);
774 write_unlock(&idev->lock);
775 printk(KERN_WARNING
776 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
777 in6_dev_put(idev);
778 ret = -1;
779 goto out;
780 }
781 in6_ifa_hold(ifp);
782 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
783 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
784 spin_unlock_bh(&ifp->lock);
785 write_unlock(&idev->lock);
786 printk(KERN_WARNING
787 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
788 in6_ifa_put(ifp);
789 in6_dev_put(idev);
790 ret = -1;
791 goto out;
792 }
793 memcpy(&addr.s6_addr[8], idev->rndid, 8);
794 tmp_valid_lft = min_t(__u32,
795 ifp->valid_lft,
796 idev->cnf.temp_valid_lft);
1ab1457c
YH		 797 tmp_prefered_lft = min_t(__u32,
798 ifp->prefered_lft,
1da177e4
LT		 799 idev->cnf.temp_prefered_lft - desync_factor / HZ);
800 tmp_plen = ifp->prefix_len;
801 max_addresses = idev->cnf.max_addresses;
802 tmp_cstamp = ifp->cstamp;
803 tmp_tstamp = ifp->tstamp;
804 spin_unlock_bh(&ifp->lock);
805
806 write_unlock(&idev->lock);
95c385b4
NH		 807
808 addr_flags = IFA_F_TEMPORARY;
809 /* set in addrconf_prefix_rcv() */
810 if (ifp->flags & IFA_F_OPTIMISTIC)
811 addr_flags |= IFA_F_OPTIMISTIC;
812
1da177e4 813 ift = !max_addresses ||
1ab1457c 814 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 815 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 816 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
817 addr_flags) : NULL;
1da177e4
LT		 818 if (!ift || IS_ERR(ift)) {
819 in6_ifa_put(ifp);
820 in6_dev_put(idev);
821 printk(KERN_INFO
822 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
823 tmpaddr = &addr;
824 write_lock(&idev->lock);
825 goto retry;
826 }
827
828 spin_lock_bh(&ift->lock);
829 ift->ifpub = ifp;
830 ift->valid_lft = tmp_valid_lft;
831 ift->prefered_lft = tmp_prefered_lft;
832 ift->cstamp = tmp_cstamp;
833 ift->tstamp = tmp_tstamp;
834 spin_unlock_bh(&ift->lock);
835
836 addrconf_dad_start(ift, 0);
837 in6_ifa_put(ift);
838 in6_dev_put(idev);
839out:
840 return ret;
841}
842#endif
843
844/*
072047e4 845 * Choose an appropriate source address (RFC3484)
1da177e4 846 */
072047e4
YH		 847struct ipv6_saddr_score {
848 int addr_type;
849 unsigned int attrs;
850 int matchlen;
0d27b427 851 int scope;
072047e4
YH		 852 unsigned int rule;
853};
854
855#define IPV6_SADDR_SCORE_LOCAL 0x0001
856#define IPV6_SADDR_SCORE_PREFERRED 0x0004
857#define IPV6_SADDR_SCORE_HOA 0x0008
858#define IPV6_SADDR_SCORE_OIF 0x0010
859#define IPV6_SADDR_SCORE_LABEL 0x0020
860#define IPV6_SADDR_SCORE_PRIVACY 0x0040
861
b6f99a21 862static inline int ipv6_saddr_preferred(int type)
1da177e4 863{
072047e4
YH		 864 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
865 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
866 return 1;
867 return 0;
1da177e4
LT		 868}
869
072047e4 870/* static matching label */
b6f99a21 871static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 872{
873 /*
874 * prefix (longest match) label
875 * -----------------------------
876 * ::1/128 0
877 * ::/0 1
878 * 2002::/16 2
879 * ::/96 3
880 * ::ffff:0:0/96 4
102128e3
ŁS		 881 * fc00::/7 5
882 * 2001::/32 6
072047e4
YH		 883 */
884 if (type & IPV6_ADDR_LOOPBACK)
885 return 0;
886 else if (type & IPV6_ADDR_COMPATv4)
887 return 3;
888 else if (type & IPV6_ADDR_MAPPED)
889 return 4;
102128e3
ŁS		 890 else if (addr->s6_addr32[0] == htonl(0x20010000))
891 return 6;
072047e4
YH		 892 else if (addr->s6_addr16[0] == htons(0x2002))
893 return 2;
102128e3
ŁS		 894 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
895 return 5;
072047e4
YH		 896 return 1;
897}
1da177e4 898
072047e4 899int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 900 struct in6_addr *daddr, struct in6_addr *saddr)
901{
072047e4
YH		 902 struct ipv6_saddr_score hiscore;
903 struct inet6_ifaddr *ifa_result = NULL;
904 int daddr_type = __ipv6_addr_type(daddr);
905 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
906 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
907 struct net_device *dev;
1da177e4 908
072047e4 909 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 910
072047e4 911 read_lock(&dev_base_lock);
8814c4b5 912 rcu_read_lock();
1da177e4 913
072047e4
YH		 914 for (dev = dev_base; dev; dev=dev->next) {
915 struct inet6_dev *idev;
916 struct inet6_ifaddr *ifa;
917
918 /* Rule 0: Candidate Source Address (section 4)
919 * - multicast and link-local destination address,
920 * the set of candidate source address MUST only
921 * include addresses assigned to interfaces
922 * belonging to the same link as the outgoing
923 * interface.
924 * (- For site-local destination addresses, the
925 * set of candidate source addresses MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same site as the outgoing
928 * interface.)
929 */
930 if ((daddr_type & IPV6_ADDR_MULTICAST ||
931 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
932 daddr_dev && dev != daddr_dev)
933 continue;
1da177e4 934
1da177e4 935 idev = __in6_dev_get(dev);
072047e4
YH		 936 if (!idev)
937 continue;
938
939 read_lock_bh(&idev->lock);
940 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
941 struct ipv6_saddr_score score;
942
943 score.addr_type = __ipv6_addr_type(&ifa->addr);
944
6b3ae80a
YH		 945 /* Rule 0:
946 * - Tentative Address (RFC2462 section 5.4)
947 * - A tentative address is not considered
948 * "assigned to an interface" in the traditional
95c385b4 949 * sense, unless it is also flagged as optimistic.
6b3ae80a 950 * - Candidate Source Address (section 4)
072047e4
YH		 951 * - In any case, anycast addresses, multicast
952 * addresses, and the unspecified address MUST
953 * NOT be included in a candidate set.
954 */
95c385b4
NH		 955 if ((ifa->flags & IFA_F_TENTATIVE) &&
956 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 957 continue;
072047e4
YH		 958 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
959 score.addr_type & IPV6_ADDR_MULTICAST)) {
960 LIMIT_NETDEBUG(KERN_DEBUG
961 "ADDRCONF: unspecified / multicast address"
962 "assigned as unicast address on %s",
963 dev->name);
964 continue;
965 }
966
967 score.attrs = 0;
968 score.matchlen = 0;
969 score.scope = 0;
970 score.rule = 0;
971
972 if (ifa_result == NULL) {
973 /* record it if the first available entry */
974 goto record_it;
975 }
976
977 /* Rule 1: Prefer same address */
978 if (hiscore.rule < 1) {
979 if (ipv6_addr_equal(&ifa_result->addr, daddr))
980 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
981 hiscore.rule++;
982 }
983 if (ipv6_addr_equal(&ifa->addr, daddr)) {
984 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
985 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
986 score.rule = 1;
987 goto record_it;
1da177e4 988 }
072047e4
YH		 989 } else {
990 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
991 continue;
1da177e4 992 }
1da177e4 993
072047e4
YH		 994 /* Rule 2: Prefer appropriate scope */
995 if (hiscore.rule < 2) {
996 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
997 hiscore.rule++;
998 }
999 score.scope = __ipv6_addr_src_scope(score.addr_type);
1000 if (hiscore.scope < score.scope) {
1001 if (hiscore.scope < daddr_scope) {
1002 score.rule = 2;
1003 goto record_it;
1004 } else
1005 continue;
1006 } else if (score.scope < hiscore.scope) {
1007 if (score.scope < daddr_scope)
e55ffac6 1008 break; /* addresses sorted by scope */
072047e4
YH		 1009 else {
1010 score.rule = 2;
1011 goto record_it;
1012 }
1013 }
1da177e4 1014
95c385b4 1015 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1016 if (hiscore.rule < 3) {
1017 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1018 (((ifa_result->flags &
1019 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1020 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1021 hiscore.rule++;
1022 }
1023 if (ipv6_saddr_preferred(score.addr_type) ||
95c385b4
NH		 1024 (((ifa_result->flags &
1025 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1026 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1027 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1028 score.rule = 3;
1029 goto record_it;
1030 }
1031 } else {
1032 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1033 continue;
1034 }
1da177e4 1035
3b9f9a1c
NT		 1036 /* Rule 4: Prefer home address */
1037#ifdef CONFIG_IPV6_MIP6
1038 if (hiscore.rule < 4) {
1039 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1040 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1041 hiscore.rule++;
1042 }
1043 if (ifa->flags & IFA_F_HOMEADDRESS) {
1044 score.attrs |= IPV6_SADDR_SCORE_HOA;
1045 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1046 score.rule = 4;
1047 goto record_it;
1048 }
1049 } else {
1050 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1051 continue;
1052 }
1053#else
220bbd74
YH		 1054 if (hiscore.rule < 4)
1055 hiscore.rule++;
3b9f9a1c 1056#endif
072047e4
YH		 1057
1058 /* Rule 5: Prefer outgoing interface */
1059 if (hiscore.rule < 5) {
1060 if (daddr_dev == NULL ||
1061 daddr_dev == ifa_result->idev->dev)
1062 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1063 hiscore.rule++;
1064 }
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa->idev->dev) {
1067 score.attrs |= IPV6_SADDR_SCORE_OIF;
1068 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1069 score.rule = 5;
1070 goto record_it;
1071 }
1072 } else {
1073 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1074 continue;
1075 }
1076
1077 /* Rule 6: Prefer matching label */
1078 if (hiscore.rule < 6) {
1079 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1080 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1081 hiscore.rule++;
1082 }
1083 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1084 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1085 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1086 score.rule = 6;
1087 goto record_it;
1da177e4 1088 }
072047e4
YH		 1089 } else {
1090 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1091 continue;
1092 }
1093
44fd0261 1094#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1095 /* Rule 7: Prefer public address
1096 * Note: prefer temprary address if use_tempaddr >= 2
1097 */
1098 if (hiscore.rule < 7) {
1099 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1100 (ifa_result->idev->cnf.use_tempaddr >= 2))
1101 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1102 hiscore.rule++;
1103 }
1104 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1105 (ifa->idev->cnf.use_tempaddr >= 2)) {
1106 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1107 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1108 score.rule = 7;
1109 goto record_it;
1110 }
1111 } else {
1112 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1113 continue;
1114 }
5e2707fa
YH		 1115#else
1116 if (hiscore.rule < 7)
1117 hiscore.rule++;
44fd0261 1118#endif
072047e4 1119 /* Rule 8: Use longest matching prefix */
12da2a43 1120 if (hiscore.rule < 8) {
072047e4 1121 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1122 hiscore.rule++;
1123 }
072047e4
YH		 1124 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1125 if (score.matchlen > hiscore.matchlen) {
1126 score.rule = 8;
1127 goto record_it;
1da177e4 1128 }
072047e4
YH		 1129#if 0
1130 else if (score.matchlen < hiscore.matchlen)
1131 continue;
1132#endif
1133
1134 /* Final Rule: choose first available one */
1135 continue;
1136record_it:
1137 if (ifa_result)
1138 in6_ifa_put(ifa_result);
1139 in6_ifa_hold(ifa);
1140 ifa_result = ifa;
1141 hiscore = score;
1da177e4 1142 }
072047e4 1143 read_unlock_bh(&idev->lock);
1da177e4 1144 }
8814c4b5 1145 rcu_read_unlock();
1da177e4
LT		 1146 read_unlock(&dev_base_lock);
1147
072047e4
YH		 1148 if (!ifa_result)
1149 return -EADDRNOTAVAIL;
1ab1457c 1150
072047e4
YH		 1151 ipv6_addr_copy(saddr, &ifa_result->addr);
1152 in6_ifa_put(ifa_result);
1153 return 0;
1da177e4
LT		 1154}
1155
1156
1157int ipv6_get_saddr(struct dst_entry *dst,
1158 struct in6_addr *daddr, struct in6_addr *saddr)
1159{
7a3025b1 1160 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1161}
1162
7159039a 1163EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1164
95c385b4
NH		 1165int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1166 unsigned char banned_flags)
1da177e4
LT		 1167{
1168 struct inet6_dev *idev;
1169 int err = -EADDRNOTAVAIL;
1170
8814c4b5 1171 rcu_read_lock();
1da177e4
LT		 1172 if ((idev = __in6_dev_get(dev)) != NULL) {
1173 struct inet6_ifaddr *ifp;
1174
1175 read_lock_bh(&idev->lock);
1176 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1177 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1178 ipv6_addr_copy(addr, &ifp->addr);
1179 err = 0;
1180 break;
1181 }
1182 }
1183 read_unlock_bh(&idev->lock);
1184 }
8814c4b5 1185 rcu_read_unlock();
1da177e4
LT		 1186 return err;
1187}
1188
1189static int ipv6_count_addresses(struct inet6_dev *idev)
1190{
1191 int cnt = 0;
1192 struct inet6_ifaddr *ifp;
1193
1194 read_lock_bh(&idev->lock);
1195 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1196 cnt++;
1197 read_unlock_bh(&idev->lock);
1198 return cnt;
1199}
1200
1201int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1202{
1203 struct inet6_ifaddr * ifp;
1204 u8 hash = ipv6_addr_hash(addr);
1205
1206 read_lock_bh(&addrconf_hash_lock);
1207 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1208 if (ipv6_addr_equal(&ifp->addr, addr) &&
1209 !(ifp->flags&IFA_F_TENTATIVE)) {
1210 if (dev == NULL || ifp->idev->dev == dev ||
1211 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1212 break;
1213 }
1214 }
1215 read_unlock_bh(&addrconf_hash_lock);
1216 return ifp != NULL;
1217}
1218
7159039a
YH		 1219EXPORT_SYMBOL(ipv6_chk_addr);
1220
1da177e4
LT		 1221static
1222int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1223{
1224 struct inet6_ifaddr * ifp;
1225 u8 hash = ipv6_addr_hash(addr);
1226
1227 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1228 if (ipv6_addr_equal(&ifp->addr, addr)) {
1229 if (dev == NULL || ifp->idev->dev == dev)
1230 break;
1231 }
1232 }
1233 return ifp != NULL;
1234}
1235
1236struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1237{
1238 struct inet6_ifaddr * ifp;
1239 u8 hash = ipv6_addr_hash(addr);
1240
1241 read_lock_bh(&addrconf_hash_lock);
1242 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1243 if (ipv6_addr_equal(&ifp->addr, addr)) {
1244 if (dev == NULL || ifp->idev->dev == dev ||
1245 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1246 in6_ifa_hold(ifp);
1247 break;
1248 }
1249 }
1250 }
1251 read_unlock_bh(&addrconf_hash_lock);
1252
1253 return ifp;
1254}
1255
1256int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1257{
1258 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1259 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1260 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1261 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1262 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1263 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1264 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1265 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1266
1267 if (!sk2_rcv_saddr && !sk_ipv6only)
1268 return 1;
1269
1270 if (addr_type2 == IPV6_ADDR_ANY &&
1271 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1272 return 1;
1273
1274 if (addr_type == IPV6_ADDR_ANY &&
1275 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1276 return 1;
1277
1278 if (sk2_rcv_saddr6 &&
1279 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1280 return 1;
1281
1282 if (addr_type == IPV6_ADDR_MAPPED &&
1283 !sk2_ipv6only &&
1284 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1285 return 1;
1286
1287 return 0;
1288}
1289
1290/* Gets referenced address, destroys ifaddr */
1291
9f5336e2 1292static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1293{
1da177e4
LT		 1294 if (ifp->flags&IFA_F_PERMANENT) {
1295 spin_lock_bh(&ifp->lock);
1296 addrconf_del_timer(ifp);
1297 ifp->flags |= IFA_F_TENTATIVE;
1298 spin_unlock_bh(&ifp->lock);
1299 in6_ifa_put(ifp);
1300#ifdef CONFIG_IPV6_PRIVACY
1301 } else if (ifp->flags&IFA_F_TEMPORARY) {
1302 struct inet6_ifaddr *ifpub;
1303 spin_lock_bh(&ifp->lock);
1304 ifpub = ifp->ifpub;
1305 if (ifpub) {
1306 in6_ifa_hold(ifpub);
1307 spin_unlock_bh(&ifp->lock);
1308 ipv6_create_tempaddr(ifpub, ifp);
1309 in6_ifa_put(ifpub);
1310 } else {
1311 spin_unlock_bh(&ifp->lock);
1312 }
1313 ipv6_del_addr(ifp);
1314#endif
1315 } else
1316 ipv6_del_addr(ifp);
1317}
1318
3c21edbd
YH		 1319void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1320{
1321 if (net_ratelimit())
1322 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1323 addrconf_dad_stop(ifp);
1324}
1da177e4
LT		 1325
1326/* Join to solicited addr multicast group. */
1327
1328void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1329{
1330 struct in6_addr maddr;
1331
1332 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1333 return;
1334
1335 addrconf_addr_solict_mult(addr, &maddr);
1336 ipv6_dev_mc_inc(dev, &maddr);
1337}
1338
1339void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1340{
1341 struct in6_addr maddr;
1342
1343 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1344 return;
1345
1346 addrconf_addr_solict_mult(addr, &maddr);
1347 __ipv6_dev_mc_dec(idev, &maddr);
1348}
1349
20380731 1350static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1351{
1352 struct in6_addr addr;
1353 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1354 if (ipv6_addr_any(&addr))
1355 return;
1356 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1357}
1358
20380731 1359static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1360{
1361 struct in6_addr addr;
1362 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1363 if (ipv6_addr_any(&addr))
1364 return;
1365 __ipv6_dev_ac_dec(ifp->idev, &addr);
1366}
1367
073a8e0e
YH		 1368static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1369{
1370 if (dev->addr_len != ETH_ALEN)
1371 return -1;
1372 memcpy(eui, dev->dev_addr, 3);
1373 memcpy(eui + 5, dev->dev_addr + 3, 3);
1374
1375 /*
1376 * The zSeries OSA network cards can be shared among various
1377 * OS instances, but the OSA cards have only one MAC address.
1378 * This leads to duplicate address conflicts in conjunction
1379 * with IPv6 if more than one instance uses the same card.
1380 *
1381 * The driver for these cards can deliver a unique 16-bit
1382 * identifier for each instance sharing the same card. It is
1383 * placed instead of 0xFFFE in the interface identifier. The
1384 * "u" bit of the interface identifier is not inverted in this
1385 * case. Hence the resulting interface identifier has local
1386 * scope according to RFC2373.
1387 */
1388 if (dev->dev_id) {
1389 eui[3] = (dev->dev_id >> 8) & 0xFF;
1390 eui[4] = dev->dev_id & 0xFF;
1391 } else {
1392 eui[3] = 0xFF;
1393 eui[4] = 0xFE;
1394 eui[0] ^= 2;
1395 }
1396 return 0;
1397}
1398
1399static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1400{
1401 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1402 if (dev->addr_len != ARCNET_ALEN)
1403 return -1;
1404 memset(eui, 0, 7);
1405 eui[7] = *(u8*)dev->dev_addr;
1406 return 0;
1407}
1408
1409static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1410{
1411 if (dev->addr_len != INFINIBAND_ALEN)
1412 return -1;
1413 memcpy(eui, dev->dev_addr + 12, 8);
1414 eui[0] |= 2;
1415 return 0;
1416}
1417
1da177e4
LT		 1418static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1419{
1420 switch (dev->type) {
1421 case ARPHRD_ETHER:
1422 case ARPHRD_FDDI:
1423 case ARPHRD_IEEE802_TR:
073a8e0e 1424 return addrconf_ifid_eui48(eui, dev);
1da177e4 1425 case ARPHRD_ARCNET:
073a8e0e 1426 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1427 case ARPHRD_INFINIBAND:
073a8e0e 1428 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1429 }
1430 return -1;
1431}
1432
1433static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1434{
1435 int err = -1;
1436 struct inet6_ifaddr *ifp;
1437
1438 read_lock_bh(&idev->lock);
1439 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1440 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1441 memcpy(eui, ifp->addr.s6_addr+8, 8);
1442 err = 0;
1443 break;
1444 }
1445 }
1446 read_unlock_bh(&idev->lock);
1447 return err;
1448}
1449
1450#ifdef CONFIG_IPV6_PRIVACY
1451/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1452static int __ipv6_regen_rndid(struct inet6_dev *idev)
1453{
1da177e4 1454regen:
955189ef 1455 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1456 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1457
1458 /*
1459 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1460 * check if generated address is not inappropriate
1461 *
1462 * - Reserved subnet anycast (RFC 2526)
1463 * 11111101 11....11 1xxxxxxx
1464 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1465 * 00-00-5E-FE-xx-xx-xx-xx
1466 * - value 0
1467 * - XXX: already assigned to an address on the device
1468 */
1ab1457c 1469 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1470 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1471 (idev->rndid[7]&0x80))
1472 goto regen;
1473 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1474 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1475 goto regen;
1476 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1477 goto regen;
1478 }
1479
1480 return 0;
1481}
1482
1483static void ipv6_regen_rndid(unsigned long data)
1484{
1485 struct inet6_dev *idev = (struct inet6_dev *) data;
1486 unsigned long expires;
1487
8814c4b5 1488 rcu_read_lock_bh();
1da177e4
LT		 1489 write_lock_bh(&idev->lock);
1490
1491 if (idev->dead)
1492 goto out;
1493
1494 if (__ipv6_regen_rndid(idev) < 0)
1495 goto out;
1ab1457c 1496
1da177e4 1497 expires = jiffies +
1ab1457c 1498 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1499 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1500 if (time_before(expires, jiffies)) {
1501 printk(KERN_WARNING
1502 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1503 idev->dev->name);
1504 goto out;
1505 }
1506
1507 if (!mod_timer(&idev->regen_timer, expires))
1508 in6_dev_hold(idev);
1509
1510out:
1511 write_unlock_bh(&idev->lock);
8814c4b5 1512 rcu_read_unlock_bh();
1da177e4
LT		 1513 in6_dev_put(idev);
1514}
1515
1516static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1517 int ret = 0;
1518
1519 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1520 ret = __ipv6_regen_rndid(idev);
1521 return ret;
1522}
1523#endif
1524
1525/*
1526 * Add prefix route.
1527 */
1528
1529static void
1530addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1531 unsigned long expires, u32 flags)
1da177e4 1532{
86872cb5
TG		 1533 struct fib6_config cfg = {
1534 .fc_table = RT6_TABLE_PREFIX,
1535 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1536 .fc_ifindex = dev->ifindex,
1537 .fc_expires = expires,
1538 .fc_dst_len = plen,
1539 .fc_flags = RTF_UP | flags,
1540 };
1da177e4 1541
86872cb5 1542 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1543
1544 /* Prevent useless cloning on PtP SIT.
1545 This thing is done here expecting that the whole
1546 class of non-broadcast devices need not cloning.
1547 */
0be669bb 1548#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1549 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1550 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1551#endif
1da177e4 1552
86872cb5 1553 ip6_route_add(&cfg);
1da177e4
LT		 1554}
1555
1556/* Create "default" multicast route to the interface */
1557
1558static void addrconf_add_mroute(struct net_device *dev)
1559{
86872cb5
TG		 1560 struct fib6_config cfg = {
1561 .fc_table = RT6_TABLE_LOCAL,
1562 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1563 .fc_ifindex = dev->ifindex,
1564 .fc_dst_len = 8,
1565 .fc_flags = RTF_UP,
1566 };
1567
1568 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1569
1570 ip6_route_add(&cfg);
1da177e4
LT		 1571}
1572
0be669bb 1573#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1574static void sit_route_add(struct net_device *dev)
1575{
86872cb5
TG		 1576 struct fib6_config cfg = {
1577 .fc_table = RT6_TABLE_MAIN,
1578 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1579 .fc_ifindex = dev->ifindex,
1580 .fc_dst_len = 96,
1581 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1582 };
1da177e4
LT		 1583
1584 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1585 ip6_route_add(&cfg);
1da177e4 1586}
0be669bb 1587#endif
1da177e4
LT		 1588
1589static void addrconf_add_lroute(struct net_device *dev)
1590{
1591 struct in6_addr addr;
1592
1593 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1594 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1595}
1596
1597static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1598{
1599 struct inet6_dev *idev;
1600
1601 ASSERT_RTNL();
1602
1603 if ((idev = ipv6_find_idev(dev)) == NULL)
1604 return NULL;
1605
1606 /* Add default multicast route */
1607 addrconf_add_mroute(dev);
1608
1609 /* Add link local route */
1610 addrconf_add_lroute(dev);
1611 return idev;
1612}
1613
1614void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1615{
1616 struct prefix_info *pinfo;
1617 __u32 valid_lft;
1618 __u32 prefered_lft;
1619 int addr_type;
1620 unsigned long rt_expires;
1621 struct inet6_dev *in6_dev;
1622
1623 pinfo = (struct prefix_info *) opt;
1ab1457c 1624
1da177e4
LT		 1625 if (len < sizeof(struct prefix_info)) {
1626 ADBG(("addrconf: prefix option too short\n"));
1627 return;
1628 }
1ab1457c 1629
1da177e4
LT		 1630 /*
1631 * Validation checks ([ADDRCONF], page 19)
1632 */
1633
1634 addr_type = ipv6_addr_type(&pinfo->prefix);
1635
1636 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1637 return;
1638
1639 valid_lft = ntohl(pinfo->valid);
1640 prefered_lft = ntohl(pinfo->prefered);
1641
1642 if (prefered_lft > valid_lft) {
1643 if (net_ratelimit())
1644 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1645 return;
1646 }
1647
1648 in6_dev = in6_dev_get(dev);
1649
1650 if (in6_dev == NULL) {
1651 if (net_ratelimit())
1652 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1653 return;
1654 }
1655
1656 /*
1657 * Two things going on here:
1658 * 1) Add routes for on-link prefixes
1659 * 2) Configure prefixes with the auto flag set
1660 */
1661
1662 /* Avoid arithmetic overflow. Really, we could
1663 save rt_expires in seconds, likely valid_lft,
1664 but it would require division in fib gc, that it
1665 not good.
1666 */
1667 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1668 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1669 else
3dd4bc68
YH		 1670 rt_expires = valid_lft * HZ;
1671
1672 /*
1673 * We convert this (in jiffies) to clock_t later.
1674 * Avoid arithmetic overflow there as well.
1675 * Overflow can happen only if HZ < USER_HZ.
1676 */
1677 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1678 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1679
1680 if (pinfo->onlink) {
1681 struct rt6_info *rt;
1682 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1683
1684 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1685 if (rt->rt6i_flags&RTF_EXPIRES) {
1686 if (valid_lft == 0) {
e0a1ad73 1687 ip6_del_rt(rt);
1da177e4
LT		 1688 rt = NULL;
1689 } else {
3dd4bc68 1690 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1691 }
1692 }
1693 } else if (valid_lft) {
1694 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1695 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1696 }
1697 if (rt)
1698 dst_release(&rt->u.dst);
1699 }
1700
1701 /* Try to figure out our local address for this prefix */
1702
1703 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1704 struct inet6_ifaddr * ifp;
1705 struct in6_addr addr;
1706 int create = 0, update_lft = 0;
1707
1708 if (pinfo->prefix_len == 64) {
1709 memcpy(&addr, &pinfo->prefix, 8);
1710 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1711 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1712 in6_dev_put(in6_dev);
1713 return;
1714 }
1715 goto ok;
1716 }
1717 if (net_ratelimit())
1718 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1719 pinfo->prefix_len);
1720 in6_dev_put(in6_dev);
1721 return;
1722
1723ok:
1724
1725 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1726
1727 if (ifp == NULL && valid_lft) {
1728 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1729 u32 addr_flags = 0;
1730
1731#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1732 if (in6_dev->cnf.optimistic_dad &&
1733 !ipv6_devconf.forwarding)
1734 addr_flags = IFA_F_OPTIMISTIC;
1735#endif
1da177e4
LT		 1736
1737 /* Do not allow to create too much of autoconfigured
1738 * addresses; this would be too easy way to crash kernel.
1739 */
1740 if (!max_addresses ||
1741 ipv6_count_addresses(in6_dev) < max_addresses)
1742 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1743 addr_type&IPV6_ADDR_SCOPE_MASK,
1744 addr_flags);
1da177e4
LT		 1745
1746 if (!ifp || IS_ERR(ifp)) {
1747 in6_dev_put(in6_dev);
1748 return;
1749 }
1750
1751 update_lft = create = 1;
1752 ifp->cstamp = jiffies;
1753 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1754 }
1755
1756 if (ifp) {
1757 int flags;
1758 unsigned long now;
1759#ifdef CONFIG_IPV6_PRIVACY
1760 struct inet6_ifaddr *ift;
1761#endif
1762 u32 stored_lft;
1763
1764 /* update lifetime (RFC2462 5.5.3 e) */
1765 spin_lock(&ifp->lock);
1766 now = jiffies;
1767 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1768 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1769 else
1770 stored_lft = 0;
1771 if (!update_lft && stored_lft) {
1772 if (valid_lft > MIN_VALID_LIFETIME ||
1773 valid_lft > stored_lft)
1774 update_lft = 1;
1775 else if (stored_lft <= MIN_VALID_LIFETIME) {
1776 /* valid_lft <= stored_lft is always true */
1777 /* XXX: IPsec */
1778 update_lft = 0;
1779 } else {
1780 valid_lft = MIN_VALID_LIFETIME;
1781 if (valid_lft < prefered_lft)
1782 prefered_lft = valid_lft;
1783 update_lft = 1;
1784 }
1785 }
1786
1787 if (update_lft) {
1788 ifp->valid_lft = valid_lft;
1789 ifp->prefered_lft = prefered_lft;
1790 ifp->tstamp = now;
1791 flags = ifp->flags;
1792 ifp->flags &= ~IFA_F_DEPRECATED;
1793 spin_unlock(&ifp->lock);
1794
1795 if (!(flags&IFA_F_TENTATIVE))
1796 ipv6_ifa_notify(0, ifp);
1797 } else
1798 spin_unlock(&ifp->lock);
1799
1800#ifdef CONFIG_IPV6_PRIVACY
1801 read_lock_bh(&in6_dev->lock);
1802 /* update all temporary addresses in the list */
1803 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1804 /*
1805 * When adjusting the lifetimes of an existing
1806 * temporary address, only lower the lifetimes.
1807 * Implementations must not increase the
1808 * lifetimes of an existing temporary address
1809 * when processing a Prefix Information Option.
1810 */
1811 spin_lock(&ift->lock);
1812 flags = ift->flags;
1813 if (ift->valid_lft > valid_lft &&
1814 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1815 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1816 if (ift->prefered_lft > prefered_lft &&
1817 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1818 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1819 spin_unlock(&ift->lock);
1820 if (!(flags&IFA_F_TENTATIVE))
1821 ipv6_ifa_notify(0, ift);
1822 }
1823
1824 if (create && in6_dev->cnf.use_tempaddr > 0) {
1825 /*
1826 * When a new public address is created as described in [ADDRCONF],
1827 * also create a new temporary address.
1828 */
1ab1457c 1829 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1830 ipv6_create_tempaddr(ifp, NULL);
1831 } else {
1832 read_unlock_bh(&in6_dev->lock);
1833 }
1834#endif
1835 in6_ifa_put(ifp);
1836 addrconf_verify(0);
1837 }
1838 }
1839 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1840 in6_dev_put(in6_dev);
1841}
1842
1843/*
1844 * Set destination address.
1845 * Special case for SIT interfaces where we create a new "virtual"
1846 * device.
1847 */
1848int addrconf_set_dstaddr(void __user *arg)
1849{
1850 struct in6_ifreq ireq;
1851 struct net_device *dev;
1852 int err = -EINVAL;
1853
1854 rtnl_lock();
1855
1856 err = -EFAULT;
1857 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1858 goto err_exit;
1859
1860 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1861
1862 err = -ENODEV;
1863 if (dev == NULL)
1864 goto err_exit;
1865
0be669bb 1866#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1867 if (dev->type == ARPHRD_SIT) {
1868 struct ifreq ifr;
1869 mm_segment_t oldfs;
1870 struct ip_tunnel_parm p;
1871
1872 err = -EADDRNOTAVAIL;
1873 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1874 goto err_exit;
1875
1876 memset(&p, 0, sizeof(p));
1877 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1878 p.iph.saddr = 0;
1879 p.iph.version = 4;
1880 p.iph.ihl = 5;
1881 p.iph.protocol = IPPROTO_IPV6;
1882 p.iph.ttl = 64;
1883 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1884
1885 oldfs = get_fs(); set_fs(KERNEL_DS);
1886 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1887 set_fs(oldfs);
1888
1889 if (err == 0) {
1890 err = -ENOBUFS;
1891 if ((dev = __dev_get_by_name(p.name)) == NULL)
1892 goto err_exit;
1893 err = dev_open(dev);
1894 }
1895 }
0be669bb 1896#endif
1da177e4
LT		 1897
1898err_exit:
1899 rtnl_unlock();
1900 return err;
1901}
1902
1903/*
1904 * Manual configuration of address on an interface
1905 */
0778769d 1906static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1907 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1908{
1909 struct inet6_ifaddr *ifp;
1910 struct inet6_dev *idev;
1911 struct net_device *dev;
1912 int scope;
46d48046 1913 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1914
1915 ASSERT_RTNL();
1ab1457c 1916
0778769d
NT		 1917 /* check the lifetime */
1918 if (!valid_lft || prefered_lft > valid_lft)
1919 return -EINVAL;
1920
1da177e4
LT		 1921 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1922 return -ENODEV;
1ab1457c 1923
1da177e4
LT		 1924 if ((idev = addrconf_add_dev(dev)) == NULL)
1925 return -ENOBUFS;
1926
1927 scope = ipv6_addr_scope(pfx);
1928
46d48046 1929 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1930 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1931 flags = 0;
1932 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1933 valid_lft = 0x7FFFFFFF/HZ;
1934
1935 if (prefered_lft == 0)
1936 ifa_flags |= IFA_F_DEPRECATED;
1937 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1938 (prefered_lft != INFINITY_LIFE_TIME))
1939 prefered_lft = 0x7FFFFFFF/HZ;
1940
1941 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1942
1da177e4 1943 if (!IS_ERR(ifp)) {
06aebfb7 1944 spin_lock_bh(&ifp->lock);
0778769d
NT		 1945 ifp->valid_lft = valid_lft;
1946 ifp->prefered_lft = prefered_lft;
1947 ifp->tstamp = jiffies;
06aebfb7 1948 spin_unlock_bh(&ifp->lock);
0778769d 1949
46d48046
YH		 1950 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1951 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1952 /*
1953 * Note that section 3.1 of RFC 4429 indicates
1954 * that the Optimistic flag should not be set for
1955 * manually configured addresses
1956 */
1da177e4
LT		 1957 addrconf_dad_start(ifp, 0);
1958 in6_ifa_put(ifp);
0778769d 1959 addrconf_verify(0);
1da177e4
LT		 1960 return 0;
1961 }
1962
1963 return PTR_ERR(ifp);
1964}
1965
1966static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1967{
1968 struct inet6_ifaddr *ifp;
1969 struct inet6_dev *idev;
1970 struct net_device *dev;
1ab1457c 1971
1da177e4
LT		 1972 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1973 return -ENODEV;
1974
1975 if ((idev = __in6_dev_get(dev)) == NULL)
1976 return -ENXIO;
1977
1978 read_lock_bh(&idev->lock);
1979 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1980 if (ifp->prefix_len == plen &&
1981 ipv6_addr_equal(pfx, &ifp->addr)) {
1982 in6_ifa_hold(ifp);
1983 read_unlock_bh(&idev->lock);
1ab1457c 1984
1da177e4
LT		 1985 ipv6_del_addr(ifp);
1986
1987 /* If the last address is deleted administratively,
1988 disable IPv6 on this interface.
1989 */
1990 if (idev->addr_list == NULL)
1991 addrconf_ifdown(idev->dev, 1);
1992 return 0;
1993 }
1994 }
1995 read_unlock_bh(&idev->lock);
1996 return -EADDRNOTAVAIL;
1997}
1998
1999
2000int addrconf_add_ifaddr(void __user *arg)
2001{
2002 struct in6_ifreq ireq;
2003 int err;
1ab1457c 2004
1da177e4
LT		 2005 if (!capable(CAP_NET_ADMIN))
2006 return -EPERM;
1ab1457c 2007
1da177e4
LT		 2008 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2009 return -EFAULT;
2010
2011 rtnl_lock();
0778769d 2012 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2013 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2014 rtnl_unlock();
2015 return err;
2016}
2017
2018int addrconf_del_ifaddr(void __user *arg)
2019{
2020 struct in6_ifreq ireq;
2021 int err;
1ab1457c 2022
1da177e4
LT		 2023 if (!capable(CAP_NET_ADMIN))
2024 return -EPERM;
2025
2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027 return -EFAULT;
2028
2029 rtnl_lock();
2030 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2031 rtnl_unlock();
2032 return err;
2033}
2034
0be669bb 2035#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2036static void sit_add_v4_addrs(struct inet6_dev *idev)
2037{
2038 struct inet6_ifaddr * ifp;
2039 struct in6_addr addr;
2040 struct net_device *dev;
2041 int scope;
2042
2043 ASSERT_RTNL();
2044
2045 memset(&addr, 0, sizeof(struct in6_addr));
2046 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2047
2048 if (idev->dev->flags&IFF_POINTOPOINT) {
2049 addr.s6_addr32[0] = htonl(0xfe800000);
2050 scope = IFA_LINK;
2051 } else {
2052 scope = IPV6_ADDR_COMPATv4;
2053 }
2054
2055 if (addr.s6_addr32[3]) {
2056 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2057 if (!IS_ERR(ifp)) {
2058 spin_lock_bh(&ifp->lock);
2059 ifp->flags &= ~IFA_F_TENTATIVE;
2060 spin_unlock_bh(&ifp->lock);
2061 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2062 in6_ifa_put(ifp);
2063 }
2064 return;
2065 }
2066
1ab1457c 2067 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 2068 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2069 if (in_dev && (dev->flags & IFF_UP)) {
2070 struct in_ifaddr * ifa;
2071
2072 int flag = scope;
2073
2074 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2075 int plen;
2076
2077 addr.s6_addr32[3] = ifa->ifa_local;
2078
2079 if (ifa->ifa_scope == RT_SCOPE_LINK)
2080 continue;
2081 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2082 if (idev->dev->flags&IFF_POINTOPOINT)
2083 continue;
2084 flag |= IFA_HOST;
2085 }
2086 if (idev->dev->flags&IFF_POINTOPOINT)
2087 plen = 64;
2088 else
2089 plen = 96;
2090
2091 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2092 IFA_F_PERMANENT);
2093 if (!IS_ERR(ifp)) {
2094 spin_lock_bh(&ifp->lock);
2095 ifp->flags &= ~IFA_F_TENTATIVE;
2096 spin_unlock_bh(&ifp->lock);
2097 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2098 in6_ifa_put(ifp);
2099 }
2100 }
2101 }
1ab1457c 2102 }
1da177e4 2103}
0be669bb 2104#endif
1da177e4
LT		 2105
2106static void init_loopback(struct net_device *dev)
2107{
2108 struct inet6_dev *idev;
2109 struct inet6_ifaddr * ifp;
2110
2111 /* ::1 */
2112
2113 ASSERT_RTNL();
2114
2115 if ((idev = ipv6_find_idev(dev)) == NULL) {
2116 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2117 return;
2118 }
2119
2120 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2121 if (!IS_ERR(ifp)) {
2122 spin_lock_bh(&ifp->lock);
2123 ifp->flags &= ~IFA_F_TENTATIVE;
2124 spin_unlock_bh(&ifp->lock);
2125 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2126 in6_ifa_put(ifp);
2127 }
2128}
2129
2130static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2131{
2132 struct inet6_ifaddr * ifp;
95c385b4
NH		 2133 u32 addr_flags = IFA_F_PERMANENT;
2134
2135#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2136 if (idev->cnf.optimistic_dad &&
2137 !ipv6_devconf.forwarding)
2138 addr_flags |= IFA_F_OPTIMISTIC;
2139#endif
1da177e4 2140
95c385b4
NH		 2141
2142 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2143 if (!IS_ERR(ifp)) {
46d48046 2144 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2145 addrconf_dad_start(ifp, 0);
2146 in6_ifa_put(ifp);
2147 }
2148}
2149
2150static void addrconf_dev_config(struct net_device *dev)
2151{
2152 struct in6_addr addr;
2153 struct inet6_dev * idev;
2154
2155 ASSERT_RTNL();
2156
1ab1457c 2157 if ((dev->type != ARPHRD_ETHER) &&
1da177e4
LT		 2158 (dev->type != ARPHRD_FDDI) &&
2159 (dev->type != ARPHRD_IEEE802_TR) &&
2160 (dev->type != ARPHRD_ARCNET) &&
2161 (dev->type != ARPHRD_INFINIBAND)) {
2162 /* Alas, we support only Ethernet autoconfiguration. */
2163 return;
2164 }
2165
2166 idev = addrconf_add_dev(dev);
2167 if (idev == NULL)
2168 return;
2169
2170 memset(&addr, 0, sizeof(struct in6_addr));
2171 addr.s6_addr32[0] = htonl(0xFE800000);
2172
2173 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2174 addrconf_add_linklocal(idev, &addr);
2175}
2176
0be669bb 2177#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2178static void addrconf_sit_config(struct net_device *dev)
2179{
2180 struct inet6_dev *idev;
2181
2182 ASSERT_RTNL();
2183
1ab1457c
YH		 2184 /*
2185 * Configure the tunnel with one of our IPv4
2186 * addresses... we should configure all of
1da177e4
LT		 2187 * our v4 addrs in the tunnel
2188 */
2189
2190 if ((idev = ipv6_find_idev(dev)) == NULL) {
2191 printk(KERN_DEBUG "init sit: add_dev failed\n");
2192 return;
2193 }
2194
2195 sit_add_v4_addrs(idev);
2196
2197 if (dev->flags&IFF_POINTOPOINT) {
2198 addrconf_add_mroute(dev);
2199 addrconf_add_lroute(dev);
2200 } else
2201 sit_route_add(dev);
2202}
0be669bb 2203#endif
1da177e4
LT		 2204
2205static inline int
2206ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2207{
2208 struct in6_addr lladdr;
2209
95c385b4 2210 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2211 addrconf_add_linklocal(idev, &lladdr);
2212 return 0;
2213 }
2214 return -1;
2215}
2216
2217static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2218{
2219 struct net_device *link_dev;
2220
2221 /* first try to inherit the link-local address from the link device */
2222 if (idev->dev->iflink &&
2223 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2224 if (!ipv6_inherit_linklocal(idev, link_dev))
2225 return;
2226 }
2227 /* then try to inherit it from any device */
2228 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2229 if (!ipv6_inherit_linklocal(idev, link_dev))
2230 return;
2231 }
2232 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2233}
2234
2235/*
2236 * Autoconfigure tunnel with a link-local address so routing protocols,
2237 * DHCPv6, MLD etc. can be run over the virtual link
2238 */
2239
2240static void addrconf_ip6_tnl_config(struct net_device *dev)
2241{
2242 struct inet6_dev *idev;
2243
2244 ASSERT_RTNL();
2245
2246 if ((idev = addrconf_add_dev(dev)) == NULL) {
2247 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2248 return;
2249 }
2250 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2251}
2252
1ab1457c 2253static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2254 void * data)
2255{
2256 struct net_device *dev = (struct net_device *) data;
2257 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2258 int run_pending = 0;
1da177e4
LT		 2259
2260 switch(event) {
45ba9dd2
YH		 2261 case NETDEV_REGISTER:
2262 if (!idev) {
2263 idev = ipv6_add_dev(dev);
2264 if (!idev)
2265 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2266 dev->name);
2267 }
2268 break;
1da177e4 2269 case NETDEV_UP:
3c21edbd
YH		 2270 case NETDEV_CHANGE:
2271 if (event == NETDEV_UP) {
2272 if (!netif_carrier_ok(dev)) {
2273 /* device is not ready yet. */
2274 printk(KERN_INFO
2275 "ADDRCONF(NETDEV_UP): %s: "
2276 "link is not ready\n",
2277 dev->name);
2278 break;
2279 }
99081049
KS		 2280
2281 if (idev)
2282 idev->if_flags |= IF_READY;
3c21edbd
YH		 2283 } else {
2284 if (!netif_carrier_ok(dev)) {
2285 /* device is still not ready. */
2286 break;
2287 }
2288
2289 if (idev) {
2290 if (idev->if_flags & IF_READY) {
2291 /* device is already configured. */
2292 break;
2293 }
2294 idev->if_flags |= IF_READY;
2295 }
2296
2297 printk(KERN_INFO
2298 "ADDRCONF(NETDEV_CHANGE): %s: "
2299 "link becomes ready\n",
2300 dev->name);
2301
c5e33bdd 2302 run_pending = 1;
3c21edbd
YH		 2303 }
2304
1da177e4 2305 switch(dev->type) {
0be669bb 2306#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2307 case ARPHRD_SIT:
2308 addrconf_sit_config(dev);
2309 break;
0be669bb 2310#endif
1da177e4
LT		 2311 case ARPHRD_TUNNEL6:
2312 addrconf_ip6_tnl_config(dev);
2313 break;
2314 case ARPHRD_LOOPBACK:
2315 init_loopback(dev);
2316 break;
2317
2318 default:
2319 addrconf_dev_config(dev);
2320 break;
3ff50b79 2321 }
1da177e4 2322 if (idev) {
c5e33bdd
YH		 2323 if (run_pending)
2324 addrconf_dad_run(idev);
2325
1da177e4
LT		 2326 /* If the MTU changed during the interface down, when the
2327 interface up, the changed MTU must be reflected in the
2328 idev as well as routers.
2329 */
2330 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2331 rt6_mtu_change(dev, dev->mtu);
2332 idev->cnf.mtu6 = dev->mtu;
2333 }
2334 idev->tstamp = jiffies;
2335 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2336 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2337 stop IPv6 on this interface.
2338 */
2339 if (dev->mtu < IPV6_MIN_MTU)
2340 addrconf_ifdown(dev, event != NETDEV_DOWN);
2341 }
2342 break;
2343
2344 case NETDEV_CHANGEMTU:
2345 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2346 rt6_mtu_change(dev, dev->mtu);
2347 idev->cnf.mtu6 = dev->mtu;
2348 break;
2349 }
2350
2351 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2352
2353 case NETDEV_DOWN:
2354 case NETDEV_UNREGISTER:
2355 /*
2356 * Remove all addresses from this interface.
2357 */
2358 addrconf_ifdown(dev, event != NETDEV_DOWN);
2359 break;
3c21edbd 2360
1da177e4
LT		 2361 case NETDEV_CHANGENAME:
2362#ifdef CONFIG_SYSCTL
2363 if (idev) {
2364 addrconf_sysctl_unregister(&idev->cnf);
2365 neigh_sysctl_unregister(idev->nd_parms);
2366 neigh_sysctl_register(dev, idev->nd_parms,
2367 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2368 &ndisc_ifinfo_sysctl_change,
2369 NULL);
2370 addrconf_sysctl_register(idev, &idev->cnf);
2371 }
2372#endif
2373 break;
3ff50b79 2374 }
1da177e4
LT		 2375
2376 return NOTIFY_OK;
2377}
2378
2379/*
2380 * addrconf module should be notified of a device going up
2381 */
2382static struct notifier_block ipv6_dev_notf = {
2383 .notifier_call = addrconf_notify,
2384 .priority = 0
2385};
2386
2387static int addrconf_ifdown(struct net_device *dev, int how)
2388{
2389 struct inet6_dev *idev;
2390 struct inet6_ifaddr *ifa, **bifa;
2391 int i;
2392
2393 ASSERT_RTNL();
2394
2395 if (dev == &loopback_dev && how == 1)
2396 how = 0;
2397
2398 rt6_ifdown(dev);
2399 neigh_ifdown(&nd_tbl, dev);
2400
2401 idev = __in6_dev_get(dev);
2402 if (idev == NULL)
2403 return -ENODEV;
2404
2405 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2406 Do not dev_put!
1da177e4
LT		 2407 */
2408 if (how == 1) {
1da177e4 2409 idev->dead = 1;
8814c4b5
YH		 2410
2411 /* protected by rtnl_lock */
2412 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2413
2414 /* Step 1.5: remove snmp6 entry */
2415 snmp6_unregister_dev(idev);
2416
2417 }
2418
2419 /* Step 2: clear hash table */
2420 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2421 bifa = &inet6_addr_lst[i];
2422
2423 write_lock_bh(&addrconf_hash_lock);
2424 while ((ifa = *bifa) != NULL) {
2425 if (ifa->idev == idev) {
2426 *bifa = ifa->lst_next;
2427 ifa->lst_next = NULL;
2428 addrconf_del_timer(ifa);
2429 in6_ifa_put(ifa);
2430 continue;
2431 }
2432 bifa = &ifa->lst_next;
2433 }
2434 write_unlock_bh(&addrconf_hash_lock);
2435 }
2436
2437 write_lock_bh(&idev->lock);
2438
2439 /* Step 3: clear flags for stateless addrconf */
2440 if (how != 1)
3c21edbd 2441 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2442
2443 /* Step 4: clear address list */
2444#ifdef CONFIG_IPV6_PRIVACY
2445 if (how == 1 && del_timer(&idev->regen_timer))
2446 in6_dev_put(idev);
2447
2448 /* clear tempaddr list */
2449 while ((ifa = idev->tempaddr_list) != NULL) {
2450 idev->tempaddr_list = ifa->tmp_next;
2451 ifa->tmp_next = NULL;
2452 ifa->dead = 1;
2453 write_unlock_bh(&idev->lock);
2454 spin_lock_bh(&ifa->lock);
2455
2456 if (ifa->ifpub) {
2457 in6_ifa_put(ifa->ifpub);
2458 ifa->ifpub = NULL;
2459 }
2460 spin_unlock_bh(&ifa->lock);
2461 in6_ifa_put(ifa);
2462 write_lock_bh(&idev->lock);
2463 }
2464#endif
2465 while ((ifa = idev->addr_list) != NULL) {
2466 idev->addr_list = ifa->if_next;
2467 ifa->if_next = NULL;
2468 ifa->dead = 1;
2469 addrconf_del_timer(ifa);
2470 write_unlock_bh(&idev->lock);
2471
2472 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2473 in6_ifa_put(ifa);
2474
2475 write_lock_bh(&idev->lock);
2476 }
2477 write_unlock_bh(&idev->lock);
2478
2479 /* Step 5: Discard multicast list */
2480
2481 if (how == 1)
2482 ipv6_mc_destroy_dev(idev);
2483 else
2484 ipv6_mc_down(idev);
2485
2486 /* Step 5: netlink notification of this interface */
2487 idev->tstamp = jiffies;
979ad663 2488 inet6_ifinfo_notify(RTM_DELLINK, idev);
1ab1457c 2489
1da177e4
LT		 2490 /* Shot the device (if unregistered) */
2491
2492 if (how == 1) {
2493#ifdef CONFIG_SYSCTL
2494 addrconf_sysctl_unregister(&idev->cnf);
2495 neigh_sysctl_unregister(idev->nd_parms);
2496#endif
2497 neigh_parms_release(&nd_tbl, idev->nd_parms);
2498 neigh_ifdown(&nd_tbl, dev);
2499 in6_dev_put(idev);
2500 }
2501 return 0;
2502}
2503
2504static void addrconf_rs_timer(unsigned long data)
2505{
2506 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2507
2508 if (ifp->idev->cnf.forwarding)
2509 goto out;
2510
2511 if (ifp->idev->if_flags & IF_RA_RCVD) {
2512 /*
2513 * Announcement received after solicitation
2514 * was sent
2515 */
2516 goto out;
2517 }
2518
2519 spin_lock(&ifp->lock);
2520 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2521 struct in6_addr all_routers;
2522
2523 /* The wait after the last probe can be shorter */
2524 addrconf_mod_timer(ifp, AC_RS,
2525 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2526 ifp->idev->cnf.rtr_solicit_delay :
2527 ifp->idev->cnf.rtr_solicit_interval);
2528 spin_unlock(&ifp->lock);
2529
2530 ipv6_addr_all_routers(&all_routers);
2531
2532 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2533 } else {
2534 spin_unlock(&ifp->lock);
2535 /*
2536 * Note: we do not support deprecated "all on-link"
2537 * assumption any longer.
2538 */
2539 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2540 ifp->idev->dev->name);
2541 }
2542
2543out:
2544 in6_ifa_put(ifp);
2545}
2546
2547/*
2548 * Duplicate Address Detection
2549 */
3c21edbd
YH		 2550static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2551{
2552 unsigned long rand_num;
2553 struct inet6_dev *idev = ifp->idev;
2554
95c385b4
NH		 2555 if (ifp->flags & IFA_F_OPTIMISTIC)
2556 rand_num = 0;
2557 else
2558 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2559
3c21edbd
YH		 2560 ifp->probes = idev->cnf.dad_transmits;
2561 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2562}
2563
e431b8c0 2564static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2565{
2566 struct inet6_dev *idev = ifp->idev;
2567 struct net_device *dev = idev->dev;
1da177e4
LT		 2568
2569 addrconf_join_solict(dev, &ifp->addr);
2570
1da177e4 2571 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2572
2573 read_lock_bh(&idev->lock);
2574 if (ifp->dead)
2575 goto out;
2576 spin_lock_bh(&ifp->lock);
2577
2578 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2579 !(ifp->flags&IFA_F_TENTATIVE) ||
2580 ifp->flags & IFA_F_NODAD) {
95c385b4 2581 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2582 spin_unlock_bh(&ifp->lock);
2583 read_unlock_bh(&idev->lock);
2584
2585 addrconf_dad_completed(ifp);
2586 return;
2587 }
2588
6732bade 2589 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2590 spin_unlock_bh(&ifp->lock);
6732bade 2591 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2592 /*
2593 * If the defice is not ready:
2594 * - keep it tentative if it is a permanent address.
2595 * - otherwise, kill it.
2596 */
2597 in6_ifa_hold(ifp);
2598 addrconf_dad_stop(ifp);
6732bade 2599 return;
3c21edbd 2600 }
95c385b4
NH		 2601
2602 /*
2603 * Optimistic nodes can start receiving
2604 * Frames right away
2605 */
2606 if(ifp->flags & IFA_F_OPTIMISTIC)
2607 ip6_ins_rt(ifp->rt);
2608
6732bade
YH		 2609 addrconf_dad_kick(ifp);
2610 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2611out:
2612 read_unlock_bh(&idev->lock);
2613}
2614
2615static void addrconf_dad_timer(unsigned long data)
2616{
2617 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2618 struct inet6_dev *idev = ifp->idev;
2619 struct in6_addr unspec;
2620 struct in6_addr mcaddr;
2621
2622 read_lock_bh(&idev->lock);
2623 if (idev->dead) {
2624 read_unlock_bh(&idev->lock);
2625 goto out;
2626 }
2627 spin_lock_bh(&ifp->lock);
2628 if (ifp->probes == 0) {
2629 /*
2630 * DAD was successful
2631 */
2632
95c385b4 2633 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2634 spin_unlock_bh(&ifp->lock);
2635 read_unlock_bh(&idev->lock);
2636
2637 addrconf_dad_completed(ifp);
2638
2639 goto out;
2640 }
2641
2642 ifp->probes--;
2643 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2644 spin_unlock_bh(&ifp->lock);
2645 read_unlock_bh(&idev->lock);
2646
2647 /* send a neighbour solicitation for our addr */
2648 memset(&unspec, 0, sizeof(unspec));
2649 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2650 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2651out:
2652 in6_ifa_put(ifp);
2653}
2654
2655static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2656{
2657 struct net_device * dev = ifp->idev->dev;
2658
2659 /*
2660 * Configure the address for reception. Now it is valid.
2661 */
2662
2663 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2664
2665 /* If added prefix is link local and forwarding is off,
2666 start sending router solicitations.
2667 */
2668
2669 if (ifp->idev->cnf.forwarding == 0 &&
2670 ifp->idev->cnf.rtr_solicits > 0 &&
2671 (dev->flags&IFF_LOOPBACK) == 0 &&
2672 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2673 struct in6_addr all_routers;
2674
2675 ipv6_addr_all_routers(&all_routers);
2676
2677 /*
2678 * If a host as already performed a random delay
2679 * [...] as part of DAD [...] there is no need
2680 * to delay again before sending the first RS
2681 */
2682 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2683
2684 spin_lock_bh(&ifp->lock);
2685 ifp->probes = 1;
2686 ifp->idev->if_flags |= IF_RS_SENT;
2687 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2688 spin_unlock_bh(&ifp->lock);
2689 }
2690}
2691
c5e33bdd
YH		 2692static void addrconf_dad_run(struct inet6_dev *idev) {
2693 struct inet6_ifaddr *ifp;
2694
2695 read_lock_bh(&idev->lock);
2696 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2697 spin_lock_bh(&ifp->lock);
2698 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2699 spin_unlock_bh(&ifp->lock);
2700 continue;
2701 }
2702 spin_unlock_bh(&ifp->lock);
2703 addrconf_dad_kick(ifp);
2704 }
2705 read_unlock_bh(&idev->lock);
2706}
2707
1da177e4
LT		 2708#ifdef CONFIG_PROC_FS
2709struct if6_iter_state {
2710 int bucket;
2711};
2712
2713static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2714{
2715 struct inet6_ifaddr *ifa = NULL;
2716 struct if6_iter_state *state = seq->private;
2717
2718 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2719 ifa = inet6_addr_lst[state->bucket];
2720 if (ifa)
2721 break;
2722 }
2723 return ifa;
2724}
2725
2726static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2727{
2728 struct if6_iter_state *state = seq->private;
2729
2730 ifa = ifa->lst_next;
2731try_again:
2732 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2733 ifa = inet6_addr_lst[state->bucket];
2734 goto try_again;
2735 }
2736 return ifa;
2737}
2738
2739static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2740{
2741 struct inet6_ifaddr *ifa = if6_get_first(seq);
2742
2743 if (ifa)
2744 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2745 --pos;
2746 return pos ? NULL : ifa;
2747}
2748
2749static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2750{
2751 read_lock_bh(&addrconf_hash_lock);
2752 return if6_get_idx(seq, *pos);
2753}
2754
2755static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2756{
2757 struct inet6_ifaddr *ifa;
2758
2759 ifa = if6_get_next(seq, v);
2760 ++*pos;
2761 return ifa;
2762}
2763
2764static void if6_seq_stop(struct seq_file *seq, void *v)
2765{
2766 read_unlock_bh(&addrconf_hash_lock);
2767}
2768
2769static int if6_seq_show(struct seq_file *seq, void *v)
2770{
2771 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2772 seq_printf(seq,
9343e79a 2773 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2774 NIP6(ifp->addr),
2775 ifp->idev->dev->ifindex,
2776 ifp->prefix_len,
2777 ifp->scope,
2778 ifp->flags,
2779 ifp->idev->dev->name);
2780 return 0;
2781}
2782
2783static struct seq_operations if6_seq_ops = {
2784 .start = if6_seq_start,
2785 .next = if6_seq_next,
2786 .show = if6_seq_show,
2787 .stop = if6_seq_stop,
2788};
2789
2790static int if6_seq_open(struct inode *inode, struct file *file)
2791{
2792 struct seq_file *seq;
2793 int rc = -ENOMEM;
322f74a4 2794 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2795
2796 if (!s)
2797 goto out;
1da177e4
LT		 2798
2799 rc = seq_open(file, &if6_seq_ops);
2800 if (rc)
2801 goto out_kfree;
2802
2803 seq = file->private_data;
2804 seq->private = s;
2805out:
2806 return rc;
2807out_kfree:
2808 kfree(s);
2809 goto out;
2810}
2811
9a32144e 2812static const struct file_operations if6_fops = {
1da177e4
LT		 2813 .owner = THIS_MODULE,
2814 .open = if6_seq_open,
2815 .read = seq_read,
2816 .llseek = seq_lseek,
2817 .release = seq_release_private,
2818};
2819
2820int __init if6_proc_init(void)
2821{
2822 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2823 return -ENOMEM;
2824 return 0;
2825}
2826
2827void if6_proc_exit(void)
2828{
2829 proc_net_remove("if_inet6");
2830}
2831#endif /* CONFIG_PROC_FS */
2832
3b9f9a1c
NT		 2833#ifdef CONFIG_IPV6_MIP6
2834/* Check if address is a home address configured on any interface. */
2835int ipv6_chk_home_addr(struct in6_addr *addr)
2836{
2837 int ret = 0;
2838 struct inet6_ifaddr * ifp;
2839 u8 hash = ipv6_addr_hash(addr);
2840 read_lock_bh(&addrconf_hash_lock);
2841 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2842 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2843 (ifp->flags & IFA_F_HOMEADDRESS)) {
2844 ret = 1;
2845 break;
2846 }
2847 }
2848 read_unlock_bh(&addrconf_hash_lock);
2849 return ret;
2850}
2851#endif
2852
1da177e4
LT		 2853/*
2854 * Periodic address status verification
2855 */
2856
2857static void addrconf_verify(unsigned long foo)
2858{
2859 struct inet6_ifaddr *ifp;
2860 unsigned long now, next;
2861 int i;
2862
2863 spin_lock_bh(&addrconf_verify_lock);
2864 now = jiffies;
2865 next = now + ADDR_CHECK_FREQUENCY;
2866
2867 del_timer(&addr_chk_timer);
2868
2869 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2870
2871restart:
5d5780df 2872 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2873 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2874 unsigned long age;
2875#ifdef CONFIG_IPV6_PRIVACY
2876 unsigned long regen_advance;
2877#endif
2878
2879 if (ifp->flags & IFA_F_PERMANENT)
2880 continue;
2881
2882 spin_lock(&ifp->lock);
2883 age = (now - ifp->tstamp) / HZ;
2884
2885#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2886 regen_advance = ifp->idev->cnf.regen_max_retry *
2887 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2888 ifp->idev->nd_parms->retrans_time / HZ;
2889#endif
2890
8f27ebb9
YH		 2891 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2892 age >= ifp->valid_lft) {
1da177e4
LT		 2893 spin_unlock(&ifp->lock);
2894 in6_ifa_hold(ifp);
5d5780df 2895 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2896 ipv6_del_addr(ifp);
2897 goto restart;
8f27ebb9
YH		 2898 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2899 spin_unlock(&ifp->lock);
2900 continue;
1da177e4
LT		 2901 } else if (age >= ifp->prefered_lft) {
2902 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2903 int deprecate = 0;
2904
2905 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2906 deprecate = 1;
2907 ifp->flags |= IFA_F_DEPRECATED;
2908 }
2909
2910 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2911 next = ifp->tstamp + ifp->valid_lft * HZ;
2912
2913 spin_unlock(&ifp->lock);
2914
2915 if (deprecate) {
2916 in6_ifa_hold(ifp);
5d5780df 2917 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2918
2919 ipv6_ifa_notify(0, ifp);
2920 in6_ifa_put(ifp);
2921 goto restart;
2922 }
2923#ifdef CONFIG_IPV6_PRIVACY
2924 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2925 !(ifp->flags&IFA_F_TENTATIVE)) {
2926 if (age >= ifp->prefered_lft - regen_advance) {
2927 struct inet6_ifaddr *ifpub = ifp->ifpub;
2928 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2929 next = ifp->tstamp + ifp->prefered_lft * HZ;
2930 if (!ifp->regen_count && ifpub) {
2931 ifp->regen_count++;
2932 in6_ifa_hold(ifp);
2933 in6_ifa_hold(ifpub);
2934 spin_unlock(&ifp->lock);
5d5780df 2935 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2936 spin_lock(&ifpub->lock);
2937 ifpub->regen_count = 0;
2938 spin_unlock(&ifpub->lock);
1da177e4
LT		 2939 ipv6_create_tempaddr(ifpub, ifp);
2940 in6_ifa_put(ifpub);
2941 in6_ifa_put(ifp);
2942 goto restart;
2943 }
2944 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2945 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2946 spin_unlock(&ifp->lock);
2947#endif
2948 } else {
2949 /* ifp->prefered_lft <= ifp->valid_lft */
2950 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2951 next = ifp->tstamp + ifp->prefered_lft * HZ;
2952 spin_unlock(&ifp->lock);
2953 }
2954 }
5d5780df 2955 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2956 }
2957
2958 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2959 add_timer(&addr_chk_timer);
2960 spin_unlock_bh(&addrconf_verify_lock);
2961}
2962
461d8837
TG		 2963static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2964{
2965 struct in6_addr *pfx = NULL;
2966
2967 if (addr)
2968 pfx = nla_data(addr);
2969
2970 if (local) {
2971 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2972 pfx = NULL;
2973 else
2974 pfx = nla_data(local);
2975 }
2976
2977 return pfx;
2978}
2979
2980static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2981 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2982 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2983 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2984};
2985
1da177e4
LT		 2986static int
2987inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2988{
b933f716
TG		 2989 struct ifaddrmsg *ifm;
2990 struct nlattr *tb[IFA_MAX+1];
1da177e4 2991 struct in6_addr *pfx;
b933f716 2992 int err;
1da177e4 2993
b933f716
TG		 2994 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2995 if (err < 0)
2996 return err;
2997
2998 ifm = nlmsg_data(nlh);
2999 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3000 if (pfx == NULL)
3001 return -EINVAL;
3002
3003 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3004}
3005
55ebaef1
NT		 3006static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3007 u32 prefered_lft, u32 valid_lft)
081bba5b 3008{
46d48046
YH		 3009 u32 flags = RTF_EXPIRES;
3010
081bba5b
NT		 3011 if (!valid_lft || (prefered_lft > valid_lft))
3012 return -EINVAL;
3013
46d48046 3014 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3015 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3016 flags = 0;
3017 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3018 valid_lft = 0x7FFFFFFF/HZ;
3019
3020 if (prefered_lft == 0)
55ebaef1 3021 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3022 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3023 (prefered_lft != INFINITY_LIFE_TIME))
3024 prefered_lft = 0x7FFFFFFF/HZ;
3025
3026 spin_lock_bh(&ifp->lock);
3b9f9a1c 3027 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3028 ifp->tstamp = jiffies;
3029 ifp->valid_lft = valid_lft;
3030 ifp->prefered_lft = prefered_lft;
3031
3032 spin_unlock_bh(&ifp->lock);
3033 if (!(ifp->flags&IFA_F_TENTATIVE))
3034 ipv6_ifa_notify(0, ifp);
081bba5b 3035
46d48046
YH		 3036 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3037 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3038 addrconf_verify(0);
3039
3040 return 0;
3041}
3042
1da177e4
LT		 3043static int
3044inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3045{
461d8837
TG		 3046 struct ifaddrmsg *ifm;
3047 struct nlattr *tb[IFA_MAX+1];
1da177e4 3048 struct in6_addr *pfx;
7198f8ce
TG		 3049 struct inet6_ifaddr *ifa;
3050 struct net_device *dev;
55ebaef1
NT		 3051 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3052 u8 ifa_flags;
461d8837 3053 int err;
1da177e4 3054
461d8837
TG		 3055 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3056 if (err < 0)
3057 return err;
3058
3059 ifm = nlmsg_data(nlh);
3060 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3061 if (pfx == NULL)
3062 return -EINVAL;
3063
461d8837 3064 if (tb[IFA_CACHEINFO]) {
0778769d 3065 struct ifa_cacheinfo *ci;
461d8837
TG		 3066
3067 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3068 valid_lft = ci->ifa_valid;
461d8837
TG		 3069 preferred_lft = ci->ifa_prefered;
3070 } else {
3071 preferred_lft = INFINITY_LIFE_TIME;
3072 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3073 }
3074
7198f8ce
TG		 3075 dev = __dev_get_by_index(ifm->ifa_index);
3076 if (dev == NULL)
3077 return -ENODEV;
3078
55ebaef1 3079 /* We ignore other flags so far. */
3b9f9a1c 3080 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3081
7198f8ce
TG		 3082 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3083 if (ifa == NULL) {
3084 /*
3085 * It would be best to check for !NLM_F_CREATE here but
3086 * userspace alreay relies on not having to provide this.
3087 */
3088 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3089 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3090 }
3091
7198f8ce
TG		 3092 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3093 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3094 err = -EEXIST;
3095 else
55ebaef1 3096 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3097
3098 in6_ifa_put(ifa);
3099
3100 return err;
1da177e4
LT		 3101}
3102
101bb229
TG		 3103static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3104 u8 scope, int ifindex)
3105{
3106 struct ifaddrmsg *ifm;
3107
3108 ifm = nlmsg_data(nlh);
3109 ifm->ifa_family = AF_INET6;
3110 ifm->ifa_prefixlen = prefixlen;
3111 ifm->ifa_flags = flags;
3112 ifm->ifa_scope = scope;
3113 ifm->ifa_index = ifindex;
3114}
3115
85486af0
TG		 3116static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3117 unsigned long tstamp, u32 preferred, u32 valid)
3118{
3119 struct ifa_cacheinfo ci;
3120
3121 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3122 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3123 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3124 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3125 ci.ifa_prefered = preferred;
3126 ci.ifa_valid = valid;
3127
3128 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3129}
3130
101bb229
TG		 3131static inline int rt_scope(int ifa_scope)
3132{
3133 if (ifa_scope & IFA_HOST)
3134 return RT_SCOPE_HOST;
3135 else if (ifa_scope & IFA_LINK)
3136 return RT_SCOPE_LINK;
3137 else if (ifa_scope & IFA_SITE)
3138 return RT_SCOPE_SITE;
3139 else
3140 return RT_SCOPE_UNIVERSE;
3141}
3142
0ab6803b
TG		 3143static inline int inet6_ifaddr_msgsize(void)
3144{
339bf98f
TG		 3145 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3146 + nla_total_size(16) /* IFA_ADDRESS */
3147 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3148}
c5396a31 3149
1da177e4 3150static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3151 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3152{
1da177e4 3153 struct nlmsghdr *nlh;
85486af0 3154 u32 preferred, valid;
1da177e4 3155
0ab6803b
TG		 3156 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3157 if (nlh == NULL)
26932566 3158 return -EMSGSIZE;
0ab6803b 3159
101bb229
TG		 3160 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3161 ifa->idev->dev->ifindex);
3162
1da177e4 3163 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3164 preferred = ifa->prefered_lft;
3165 valid = ifa->valid_lft;
3166 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3167 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3168 preferred -= tval;
3169 if (valid != INFINITY_LIFE_TIME)
3170 valid -= tval;
1da177e4
LT		 3171 }
3172 } else {
85486af0
TG		 3173 preferred = INFINITY_LIFE_TIME;
3174 valid = INFINITY_LIFE_TIME;
3175 }
3176
0ab6803b 3177 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3178 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3179 nlmsg_cancel(skb, nlh);
3180 return -EMSGSIZE;
3181 }
1da177e4 3182
0ab6803b 3183 return nlmsg_end(skb, nlh);
1da177e4
LT		 3184}
3185
3186static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3187 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3188{
1da177e4 3189 struct nlmsghdr *nlh;
101bb229
TG		 3190 u8 scope = RT_SCOPE_UNIVERSE;
3191 int ifindex = ifmca->idev->dev->ifindex;
3192
3193 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3194 scope = RT_SCOPE_SITE;
1da177e4 3195
0ab6803b
TG		 3196 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3197 if (nlh == NULL)
26932566 3198 return -EMSGSIZE;
85486af0 3199
0ab6803b
TG		 3200 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3201 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3202 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3203 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3204 nlmsg_cancel(skb, nlh);
3205 return -EMSGSIZE;
3206 }
85486af0 3207
0ab6803b 3208 return nlmsg_end(skb, nlh);
1da177e4
LT		 3209}
3210
3211static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3212 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3213{
1da177e4 3214 struct nlmsghdr *nlh;
101bb229
TG		 3215 u8 scope = RT_SCOPE_UNIVERSE;
3216 int ifindex = ifaca->aca_idev->dev->ifindex;
3217
3218 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3219 scope = RT_SCOPE_SITE;
1da177e4 3220
0ab6803b
TG		 3221 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3222 if (nlh == NULL)
26932566 3223 return -EMSGSIZE;
85486af0 3224
0ab6803b
TG		 3225 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3226 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3227 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3228 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3229 nlmsg_cancel(skb, nlh);
3230 return -EMSGSIZE;
3231 }
1da177e4 3232
0ab6803b 3233 return nlmsg_end(skb, nlh);
1da177e4
LT		 3234}
3235
3236enum addr_type_t
3237{
3238 UNICAST_ADDR,
3239 MULTICAST_ADDR,
3240 ANYCAST_ADDR,
3241};
3242
3243static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3244 enum addr_type_t type)
3245{
3246 int idx, ip_idx;
3247 int s_idx, s_ip_idx;
3248 int err = 1;
3249 struct net_device *dev;
3250 struct inet6_dev *idev = NULL;
3251 struct inet6_ifaddr *ifa;
3252 struct ifmcaddr6 *ifmca;
3253 struct ifacaddr6 *ifaca;
3254
3255 s_idx = cb->args[0];
3256 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3257
1da177e4
LT		 3258 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3259 if (idx < s_idx)
3260 continue;
3261 if (idx > s_idx)
3262 s_ip_idx = 0;
3263 ip_idx = 0;
3264 if ((idev = in6_dev_get(dev)) == NULL)
3265 continue;
3266 read_lock_bh(&idev->lock);
3267 switch (type) {
3268 case UNICAST_ADDR:
ae9cda5d 3269 /* unicast address incl. temp addr */
1da177e4
LT		 3270 for (ifa = idev->addr_list; ifa;
3271 ifa = ifa->if_next, ip_idx++) {
3272 if (ip_idx < s_ip_idx)
3273 continue;
1ab1457c
YH		 3274 if ((err = inet6_fill_ifaddr(skb, ifa,
3275 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3276 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3277 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3278 goto done;
3279 }
1da177e4
LT		 3280 break;
3281 case MULTICAST_ADDR:
3282 /* multicast address */
1ab1457c 3283 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3284 ifmca = ifmca->next, ip_idx++) {
3285 if (ip_idx < s_ip_idx)
3286 continue;
1ab1457c
YH		 3287 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3288 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3289 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3290 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3291 goto done;
3292 }
3293 break;
3294 case ANYCAST_ADDR:
3295 /* anycast address */
3296 for (ifaca = idev->ac_list; ifaca;
3297 ifaca = ifaca->aca_next, ip_idx++) {
3298 if (ip_idx < s_ip_idx)
3299 continue;
1ab1457c
YH		 3300 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3301 NETLINK_CB(cb->skb).pid,
b6544c0b 3302 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3303 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3304 goto done;
3305 }
3306 break;
3307 default:
3308 break;
3309 }
3310 read_unlock_bh(&idev->lock);
3311 in6_dev_put(idev);
3312 }
3313done:
3314 if (err <= 0) {
3315 read_unlock_bh(&idev->lock);
3316 in6_dev_put(idev);
3317 }
1da177e4
LT		 3318 cb->args[0] = idx;
3319 cb->args[1] = ip_idx;
3320 return skb->len;
3321}
3322
3323static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3324{
3325 enum addr_type_t type = UNICAST_ADDR;
3326 return inet6_dump_addr(skb, cb, type);
3327}
3328
3329static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3330{
3331 enum addr_type_t type = MULTICAST_ADDR;
3332 return inet6_dump_addr(skb, cb, type);
3333}
3334
3335
3336static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3337{
3338 enum addr_type_t type = ANYCAST_ADDR;
3339 return inet6_dump_addr(skb, cb, type);
3340}
3341
1b29fc2c
TG		 3342static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3343 void *arg)
6c223828 3344{
1b29fc2c
TG		 3345 struct ifaddrmsg *ifm;
3346 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3347 struct in6_addr *addr = NULL;
3348 struct net_device *dev = NULL;
3349 struct inet6_ifaddr *ifa;
3350 struct sk_buff *skb;
6c223828
NT		 3351 int err;
3352
1b29fc2c
TG		 3353 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3354 if (err < 0)
3355 goto errout;
3356
3357 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3358 if (addr == NULL) {
3359 err = -EINVAL;
3360 goto errout;
6c223828 3361 }
6c223828 3362
1b29fc2c 3363 ifm = nlmsg_data(nlh);
6c223828
NT		 3364 if (ifm->ifa_index)
3365 dev = __dev_get_by_index(ifm->ifa_index);
3366
1b29fc2c
TG		 3367 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3368 err = -EADDRNOTAVAIL;
3369 goto errout;
3370 }
6c223828 3371
0ab6803b 3372 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3373 err = -ENOBUFS;
1b29fc2c 3374 goto errout_ifa;
6c223828
NT		 3375 }
3376
6c223828
NT		 3377 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3378 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3379 if (err < 0) {
3380 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3381 WARN_ON(err == -EMSGSIZE);
3382 kfree_skb(skb);
3383 goto errout_ifa;
3384 }
2942e900 3385 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3386errout_ifa:
6c223828 3387 in6_ifa_put(ifa);
1b29fc2c 3388errout:
6c223828 3389 return err;
6c223828
NT		 3390}
3391
1da177e4
LT		 3392static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3393{
3394 struct sk_buff *skb;
5d620266 3395 int err = -ENOBUFS;
1da177e4 3396
0ab6803b 3397 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3398 if (skb == NULL)
3399 goto errout;
3400
3401 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3402 if (err < 0) {
3403 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3404 WARN_ON(err == -EMSGSIZE);
3405 kfree_skb(skb);
3406 goto errout;
3407 }
5d620266
TG		 3408 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3409errout:
3410 if (err < 0)
3411 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3412}
3413
b6f99a21 3414static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3415 __s32 *array, int bytes)
3416{
04561c1f
TG		 3417 BUG_ON(bytes < (DEVCONF_MAX * 4));
3418
1da177e4
LT		 3419 memset(array, 0, bytes);
3420 array[DEVCONF_FORWARDING] = cnf->forwarding;
3421 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3422 array[DEVCONF_MTU6] = cnf->mtu6;
3423 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3424 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3425 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3426 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3427 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3428 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3429 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3430 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3431#ifdef CONFIG_IPV6_PRIVACY
3432 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3433 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3434 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3435 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3436 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3437#endif
3438 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3439 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3440 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3441#ifdef CONFIG_IPV6_ROUTER_PREF
3442 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3443 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3444#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3445 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3446#endif
930d6ff2 3447#endif
fbea49e1 3448 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3449 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3450#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3451 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3452#endif
1da177e4
LT		 3453}
3454
339bf98f
TG		 3455static inline size_t inet6_if_nlmsg_size(void)
3456{
3457 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3458 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3459 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3460 + nla_total_size(4) /* IFLA_MTU */
3461 + nla_total_size(4) /* IFLA_LINK */
3462 + nla_total_size( /* IFLA_PROTINFO */
3463 nla_total_size(4) /* IFLA_INET6_FLAGS */
3464 + nla_total_size(sizeof(struct ifla_cacheinfo))
3465 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3466 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3467 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3468 );
3469}
c5396a31 3470
7f7d9a6b
HX		 3471static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3472 int bytes)
3473{
3474 int i;
3475 int pad = bytes - sizeof(u64) * items;
3476 BUG_ON(pad < 0);
3477
3478 /* Use put_unaligned() because stats may not be aligned for u64. */
3479 put_unaligned(items, &stats[0]);
3480 for (i = 1; i < items; i++)
3481 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3482
3483 memset(&stats[items], 0, pad);
3484}
3485
3486static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3487 int bytes)
3488{
3489 switch(attrtype) {
3490 case IFLA_INET6_STATS:
3491 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3492 break;
3493 case IFLA_INET6_ICMP6STATS:
3494 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3495 break;
3496 }
3497}
3498
1ab1457c 3499static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3500 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3501{
04561c1f 3502 struct net_device *dev = idev->dev;
bf99f1bd 3503 struct nlattr *nla;
04561c1f
TG		 3504 struct ifinfomsg *hdr;
3505 struct nlmsghdr *nlh;
3506 void *protoinfo;
3507 struct ifla_cacheinfo ci;
3508
3509 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3510 if (nlh == NULL)
26932566 3511 return -EMSGSIZE;
04561c1f
TG		 3512
3513 hdr = nlmsg_data(nlh);
3514 hdr->ifi_family = AF_INET6;
3515 hdr->__ifi_pad = 0;
3516 hdr->ifi_type = dev->type;
3517 hdr->ifi_index = dev->ifindex;
3518 hdr->ifi_flags = dev_get_flags(dev);
3519 hdr->ifi_change = 0;
3520
3521 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3522
3523 if (dev->addr_len)
04561c1f 3524 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3525
04561c1f 3526 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3527 if (dev->ifindex != dev->iflink)
04561c1f 3528 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3529
04561c1f
TG		 3530 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3531 if (protoinfo == NULL)
3532 goto nla_put_failure;
1da177e4 3533
04561c1f 3534 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3535
1da177e4
LT		 3536 ci.max_reasm_len = IPV6_MAXPLEN;
3537 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3538 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3539 ci.reachable_time = idev->nd_parms->reachable_time;
3540 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3541 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3542
bf99f1bd
YH		 3543 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3544 if (nla == NULL)
04561c1f 3545 goto nla_put_failure;
bf99f1bd 3546 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3547
bf99f1bd
YH		 3548 /* XXX - MC not implemented */
3549
3550 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3551 if (nla == NULL)
3552 goto nla_put_failure;
3553 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3554
3555 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3556 if (nla == NULL)
3557 goto nla_put_failure;
3558 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3559
04561c1f
TG		 3560 nla_nest_end(skb, protoinfo);
3561 return nlmsg_end(skb, nlh);
1da177e4 3562
04561c1f 3563nla_put_failure:
26932566
PM		 3564 nlmsg_cancel(skb, nlh);
3565 return -EMSGSIZE;
1da177e4
LT		 3566}
3567
3568static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3569{
3570 int idx, err;
3571 int s_idx = cb->args[0];
3572 struct net_device *dev;
3573 struct inet6_dev *idev;
3574
3575 read_lock(&dev_base_lock);
3576 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3577 if (idx < s_idx)
3578 continue;
3579 if ((idev = in6_dev_get(dev)) == NULL)
3580 continue;
1ab1457c 3581 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3582 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3583 in6_dev_put(idev);
3584 if (err <= 0)
3585 break;
3586 }
3587 read_unlock(&dev_base_lock);
3588 cb->args[0] = idx;
3589
3590 return skb->len;
3591}
3592
3593void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3594{
3595 struct sk_buff *skb;
8d7a76c9 3596 int err = -ENOBUFS;
1ab1457c 3597
339bf98f 3598 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3599 if (skb == NULL)
3600 goto errout;
3601
3602 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3603 if (err < 0) {
3604 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3605 WARN_ON(err == -EMSGSIZE);
3606 kfree_skb(skb);
3607 goto errout;
3608 }
8d7a76c9
TG		 3609 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3610errout:
3611 if (err < 0)
3612 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3613}
3614
339bf98f
TG		 3615static inline size_t inet6_prefix_nlmsg_size(void)
3616{
3617 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3618 + nla_total_size(sizeof(struct in6_addr))
3619 + nla_total_size(sizeof(struct prefix_cacheinfo));
3620}
c5396a31 3621
1da177e4 3622static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3623 struct prefix_info *pinfo, u32 pid, u32 seq,
3624 int event, unsigned int flags)
1da177e4 3625{
6051e2f4
TG		 3626 struct prefixmsg *pmsg;
3627 struct nlmsghdr *nlh;
1da177e4
LT		 3628 struct prefix_cacheinfo ci;
3629
6051e2f4
TG		 3630 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3631 if (nlh == NULL)
26932566 3632 return -EMSGSIZE;
6051e2f4
TG		 3633
3634 pmsg = nlmsg_data(nlh);
1da177e4 3635 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3636 pmsg->prefix_pad1 = 0;
3637 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3638 pmsg->prefix_ifindex = idev->dev->ifindex;
3639 pmsg->prefix_len = pinfo->prefix_len;
3640 pmsg->prefix_type = pinfo->type;
8a47077a 3641 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3642 pmsg->prefix_flags = 0;
3643 if (pinfo->onlink)
3644 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3645 if (pinfo->autoconf)
3646 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3647
6051e2f4 3648 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3649
3650 ci.preferred_time = ntohl(pinfo->prefered);
3651 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3652 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3653
6051e2f4 3654 return nlmsg_end(skb, nlh);
1da177e4 3655
6051e2f4 3656nla_put_failure:
26932566
PM		 3657 nlmsg_cancel(skb, nlh);
3658 return -EMSGSIZE;
1da177e4
LT		 3659}
3660
1ab1457c 3661static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3662 struct prefix_info *pinfo)
3663{
3664 struct sk_buff *skb;
8c384bfa 3665 int err = -ENOBUFS;
1da177e4 3666
339bf98f 3667 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3668 if (skb == NULL)
3669 goto errout;
3670
3671 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3672 if (err < 0) {
3673 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3674 WARN_ON(err == -EMSGSIZE);
3675 kfree_skb(skb);
3676 goto errout;
3677 }
8c384bfa
TG		 3678 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3679errout:
3680 if (err < 0)
3681 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3682}
3683
1da177e4
LT		 3684static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3685{
3686 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3687
3688 switch (event) {
3689 case RTM_NEWADDR:
95c385b4
NH		 3690 /*
3691 * If the address was optimistic
3692 * we inserted the route at the start of
3693 * our DAD process, so we don't need
3694 * to do it again
3695 */
3696 if (!(ifp->rt->rt6i_node))
3697 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3698 if (ifp->idev->cnf.forwarding)
3699 addrconf_join_anycast(ifp);
3700 break;
3701 case RTM_DELADDR:
3702 if (ifp->idev->cnf.forwarding)
3703 addrconf_leave_anycast(ifp);
3704 addrconf_leave_solict(ifp->idev, &ifp->addr);
3705 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3706 if (ip6_del_rt(ifp->rt))
1da177e4 3707 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3708 break;
3709 }
3710}
3711
3712static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3713{
8814c4b5 3714 rcu_read_lock_bh();
1da177e4
LT		 3715 if (likely(ifp->idev->dead == 0))
3716 __ipv6_ifa_notify(event, ifp);
8814c4b5 3717 rcu_read_unlock_bh();
1da177e4
LT		 3718}
3719
3720#ifdef CONFIG_SYSCTL
3721
3722static
3723int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3724 void __user *buffer, size_t *lenp, loff_t *ppos)
3725{
3726 int *valp = ctl->data;
3727 int val = *valp;
3728 int ret;
3729
3730 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3731
3732 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3733 if (valp != &ipv6_devconf.forwarding) {
3734 if ((!*valp) ^ (!val)) {
3735 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3736 if (idev == NULL)
3737 return ret;
3738 dev_forward_change(idev);
3739 }
3740 } else {
3741 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3742 addrconf_forward_change();
3743 }
3744 if (*valp)
3745 rt6_purge_dflt_routers();
3746 }
3747
1ab1457c 3748 return ret;
1da177e4
LT		 3749}
3750
1ab1457c 3751static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3752 int __user *name, int nlen,
3753 void __user *oldval,
3754 size_t __user *oldlenp,
1f29bcd7 3755 void __user *newval, size_t newlen)
1da177e4
LT		 3756{
3757 int *valp = table->data;
3758 int new;
3759
3760 if (!newval || !newlen)
3761 return 0;
3762 if (newlen != sizeof(int))
3763 return -EINVAL;
3764 if (get_user(new, (int __user *)newval))
3765 return -EFAULT;
3766 if (new == *valp)
3767 return 0;
3768 if (oldval && oldlenp) {
3769 size_t len;
3770 if (get_user(len, oldlenp))
3771 return -EFAULT;
3772 if (len) {
3773 if (len > table->maxlen)
3774 len = table->maxlen;
3775 if (copy_to_user(oldval, valp, len))
3776 return -EFAULT;
3777 if (put_user(len, oldlenp))
3778 return -EFAULT;
3779 }
3780 }
3781
3782 if (valp != &ipv6_devconf_dflt.forwarding) {
3783 if (valp != &ipv6_devconf.forwarding) {
3784 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3785 int changed;
3786 if (unlikely(idev == NULL))
3787 return -ENODEV;
3788 changed = (!*valp) ^ (!new);
3789 *valp = new;
3790 if (changed)
3791 dev_forward_change(idev);
3792 } else {
3793 *valp = new;
3794 addrconf_forward_change();
3795 }
3796
3797 if (*valp)
3798 rt6_purge_dflt_routers();
3799 } else
3800 *valp = new;
3801
3802 return 1;
3803}
3804
3805static struct addrconf_sysctl_table
3806{
3807 struct ctl_table_header *sysctl_header;
3808 ctl_table addrconf_vars[__NET_IPV6_MAX];
3809 ctl_table addrconf_dev[2];
3810 ctl_table addrconf_conf_dir[2];
3811 ctl_table addrconf_proto_dir[2];
3812 ctl_table addrconf_root_dir[2];
ab32ea5d 3813} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3814 .sysctl_header = NULL,
3815 .addrconf_vars = {
1ab1457c 3816 {
1da177e4
LT		 3817 .ctl_name = NET_IPV6_FORWARDING,
3818 .procname = "forwarding",
1ab1457c 3819 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3820 .maxlen = sizeof(int),
3821 .mode = 0644,
1ab1457c 3822 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3823 .strategy = &addrconf_sysctl_forward_strategy,
3824 },
3825 {
3826 .ctl_name = NET_IPV6_HOP_LIMIT,
3827 .procname = "hop_limit",
1ab1457c 3828 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3829 .maxlen = sizeof(int),
3830 .mode = 0644,
3831 .proc_handler = proc_dointvec,
3832 },
3833 {
3834 .ctl_name = NET_IPV6_MTU,
3835 .procname = "mtu",
3836 .data = &ipv6_devconf.mtu6,
1ab1457c 3837 .maxlen = sizeof(int),
1da177e4 3838 .mode = 0644,
1ab1457c 3839 .proc_handler = &proc_dointvec,
1da177e4
LT		 3840 },
3841 {
3842 .ctl_name = NET_IPV6_ACCEPT_RA,
3843 .procname = "accept_ra",
1ab1457c 3844 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3845 .maxlen = sizeof(int),
3846 .mode = 0644,
1ab1457c 3847 .proc_handler = &proc_dointvec,
1da177e4
LT		 3848 },
3849 {
3850 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3851 .procname = "accept_redirects",
1ab1457c 3852 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3853 .maxlen = sizeof(int),
3854 .mode = 0644,
1ab1457c 3855 .proc_handler = &proc_dointvec,
1da177e4
LT		 3856 },
3857 {
3858 .ctl_name = NET_IPV6_AUTOCONF,
3859 .procname = "autoconf",
1ab1457c 3860 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3861 .maxlen = sizeof(int),
3862 .mode = 0644,
1ab1457c 3863 .proc_handler = &proc_dointvec,
1da177e4
LT		 3864 },
3865 {
3866 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3867 .procname = "dad_transmits",
1ab1457c 3868 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3869 .maxlen = sizeof(int),
3870 .mode = 0644,
1ab1457c 3871 .proc_handler = &proc_dointvec,
1da177e4
LT		 3872 },
3873 {
3874 .ctl_name = NET_IPV6_RTR_SOLICITS,
3875 .procname = "router_solicitations",
1ab1457c 3876 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3877 .maxlen = sizeof(int),
3878 .mode = 0644,
1ab1457c 3879 .proc_handler = &proc_dointvec,
1da177e4
LT		 3880 },
3881 {
3882 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3883 .procname = "router_solicitation_interval",
1ab1457c 3884 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3885 .maxlen = sizeof(int),
3886 .mode = 0644,
1ab1457c 3887 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3888 .strategy = &sysctl_jiffies,
3889 },
3890 {
3891 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3892 .procname = "router_solicitation_delay",
1ab1457c 3893 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3894 .maxlen = sizeof(int),
3895 .mode = 0644,
1ab1457c 3896 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3897 .strategy = &sysctl_jiffies,
3898 },
3899 {
3900 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3901 .procname = "force_mld_version",
1ab1457c 3902 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3903 .maxlen = sizeof(int),
3904 .mode = 0644,
1ab1457c 3905 .proc_handler = &proc_dointvec,
1da177e4
LT		 3906 },
3907#ifdef CONFIG_IPV6_PRIVACY
3908 {
3909 .ctl_name = NET_IPV6_USE_TEMPADDR,
3910 .procname = "use_tempaddr",
1ab1457c 3911 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3912 .maxlen = sizeof(int),
3913 .mode = 0644,
1ab1457c 3914 .proc_handler = &proc_dointvec,
1da177e4
LT		 3915 },
3916 {
3917 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3918 .procname = "temp_valid_lft",
1ab1457c 3919 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3920 .maxlen = sizeof(int),
3921 .mode = 0644,
1ab1457c 3922 .proc_handler = &proc_dointvec,
1da177e4
LT		 3923 },
3924 {
3925 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3926 .procname = "temp_prefered_lft",
1ab1457c 3927 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3928 .maxlen = sizeof(int),
3929 .mode = 0644,
1ab1457c 3930 .proc_handler = &proc_dointvec,
1da177e4
LT		 3931 },
3932 {
3933 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3934 .procname = "regen_max_retry",
1ab1457c 3935 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3936 .maxlen = sizeof(int),
3937 .mode = 0644,
1ab1457c 3938 .proc_handler = &proc_dointvec,
1da177e4
LT		 3939 },
3940 {
3941 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3942 .procname = "max_desync_factor",
1ab1457c 3943 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3944 .maxlen = sizeof(int),
3945 .mode = 0644,
1ab1457c 3946 .proc_handler = &proc_dointvec,
1da177e4
LT		 3947 },
3948#endif
3949 {
3950 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3951 .procname = "max_addresses",
3952 .data = &ipv6_devconf.max_addresses,
3953 .maxlen = sizeof(int),
3954 .mode = 0644,
3955 .proc_handler = &proc_dointvec,
3956 },
65f5c7c1
YH		 3957 {
3958 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3959 .procname = "accept_ra_defrtr",
1ab1457c 3960 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3961 .maxlen = sizeof(int),
3962 .mode = 0644,
1ab1457c 3963 .proc_handler = &proc_dointvec,
65f5c7c1 3964 },
c4fd30eb
YH		 3965 {
3966 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3967 .procname = "accept_ra_pinfo",
1ab1457c 3968 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3969 .maxlen = sizeof(int),
3970 .mode = 0644,
1ab1457c 3971 .proc_handler = &proc_dointvec,
c4fd30eb 3972 },
930d6ff2
YH		 3973#ifdef CONFIG_IPV6_ROUTER_PREF
3974 {
3975 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3976 .procname = "accept_ra_rtr_pref",
3977 .data = &ipv6_devconf.accept_ra_rtr_pref,
3978 .maxlen = sizeof(int),
3979 .mode = 0644,
3980 .proc_handler = &proc_dointvec,
3981 },
52e16356
YH		 3982 {
3983 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3984 .procname = "router_probe_interval",
3985 .data = &ipv6_devconf.rtr_probe_interval,
3986 .maxlen = sizeof(int),
3987 .mode = 0644,
3988 .proc_handler = &proc_dointvec_jiffies,
3989 .strategy = &sysctl_jiffies,
3990 },
fa03ef38 3991#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3992 {
3993 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3994 .procname = "accept_ra_rt_info_max_plen",
3995 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3996 .maxlen = sizeof(int),
3997 .mode = 0644,
3998 .proc_handler = &proc_dointvec,
3999 },
4000#endif
930d6ff2 4001#endif
fbea49e1
YH		 4002 {
4003 .ctl_name = NET_IPV6_PROXY_NDP,
4004 .procname = "proxy_ndp",
4005 .data = &ipv6_devconf.proxy_ndp,
4006 .maxlen = sizeof(int),
4007 .mode = 0644,
4008 .proc_handler = &proc_dointvec,
4009 },
0bcbc926
YH		 4010 {
4011 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4012 .procname = "accept_source_route",
4013 .data = &ipv6_devconf.accept_source_route,
4014 .maxlen = sizeof(int),
4015 .mode = 0644,
4016 .proc_handler = &proc_dointvec,
4017 },
95c385b4
NH		 4018#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4019 {
4020 .ctl_name = CTL_UNNUMBERED,
4021 .procname = "optimistic_dad",
4022 .data = &ipv6_devconf.optimistic_dad,
4023 .maxlen = sizeof(int),
4024 .mode = 0644,
4025 .proc_handler = &proc_dointvec,
4026
4027 },
4028#endif
1da177e4
LT		 4029 {
4030 .ctl_name = 0, /* sentinel */
4031 }
4032 },
4033 .addrconf_dev = {
4034 {
4035 .ctl_name = NET_PROTO_CONF_ALL,
4036 .procname = "all",
4037 .mode = 0555,
4038 .child = addrconf_sysctl.addrconf_vars,
4039 },
4040 {
4041 .ctl_name = 0, /* sentinel */
4042 }
4043 },
4044 .addrconf_conf_dir = {
4045 {
4046 .ctl_name = NET_IPV6_CONF,
4047 .procname = "conf",
4048 .mode = 0555,
4049 .child = addrconf_sysctl.addrconf_dev,
4050 },
4051 {
4052 .ctl_name = 0, /* sentinel */
4053 }
4054 },
4055 .addrconf_proto_dir = {
4056 {
4057 .ctl_name = NET_IPV6,
4058 .procname = "ipv6",
4059 .mode = 0555,
4060 .child = addrconf_sysctl.addrconf_conf_dir,
4061 },
4062 {
4063 .ctl_name = 0, /* sentinel */
4064 }
4065 },
4066 .addrconf_root_dir = {
4067 {
4068 .ctl_name = CTL_NET,
4069 .procname = "net",
4070 .mode = 0555,
4071 .child = addrconf_sysctl.addrconf_proto_dir,
4072 },
4073 {
4074 .ctl_name = 0, /* sentinel */
4075 }
4076 },
4077};
4078
4079static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4080{
4081 int i;
4082 struct net_device *dev = idev ? idev->dev : NULL;
4083 struct addrconf_sysctl_table *t;
4084 char *dev_name = NULL;
4085
af879cc7 4086 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4087 if (t == NULL)
4088 return;
1da177e4
LT		 4089 for (i=0; t->addrconf_vars[i].data; i++) {
4090 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4091 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4092 }
4093 if (dev) {
1ab1457c 4094 dev_name = dev->name;
1da177e4
LT		 4095 t->addrconf_dev[0].ctl_name = dev->ifindex;
4096 } else {
4097 dev_name = "default";
4098 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4099 }
4100
1ab1457c
YH		 4101 /*
4102 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4103 * by sysctl and we wouldn't want anyone to change it under our feet
4104 * (see SIOCSIFNAME).
1ab1457c 4105 */
543537bd 4106 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4107 if (!dev_name)
4108 goto free;
4109
4110 t->addrconf_dev[0].procname = dev_name;
4111
4112 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4113 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4114 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4115 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4116
0b4d4147 4117 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4118 if (t->sysctl_header == NULL)
4119 goto free_procname;
4120 else
4121 p->sysctl = t;
4122 return;
4123
4124 /* error path */
4125 free_procname:
4126 kfree(dev_name);
4127 free:
4128 kfree(t);
4129
4130 return;
4131}
4132
4133static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4134{
4135 if (p->sysctl) {
4136 struct addrconf_sysctl_table *t = p->sysctl;
4137 p->sysctl = NULL;
4138 unregister_sysctl_table(t->sysctl_header);
4139 kfree(t->addrconf_dev[0].procname);
4140 kfree(t);
4141 }
4142}
4143
4144
4145#endif
4146
4147/*
4148 * Device notifier
4149 */
4150
4151int register_inet6addr_notifier(struct notifier_block *nb)
4152{
1ab1457c 4153 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4154}
4155
7159039a
YH		 4156EXPORT_SYMBOL(register_inet6addr_notifier);
4157
1da177e4
LT		 4158int unregister_inet6addr_notifier(struct notifier_block *nb)
4159{
1ab1457c 4160 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4161}
4162
7159039a
YH		 4163EXPORT_SYMBOL(unregister_inet6addr_notifier);
4164
1da177e4
LT		 4165/*
4166 * Init / cleanup code
4167 */
4168
4169int __init addrconf_init(void)
4170{
4171 int err = 0;
4172
4173 /* The addrconf netdev notifier requires that loopback_dev
4174 * has it's ipv6 private information allocated and setup
4175 * before it can bring up and give link-local addresses
4176 * to other devices which are up.
4177 *
4178 * Unfortunately, loopback_dev is not necessarily the first
4179 * entry in the global dev_base list of net devices. In fact,
4180 * it is likely to be the very last entry on that list.
4181 * So this causes the notifier registry below to try and
4182 * give link-local addresses to all devices besides loopback_dev
4183 * first, then loopback_dev, which cases all the non-loopback_dev
4184 * devices to fail to get a link-local address.
4185 *
4186 * So, as a temporary fix, allocate the ipv6 structure for
4187 * loopback_dev first by hand.
4188 * Longer term, all of the dependencies ipv6 has upon the loopback
4189 * device and it being up should be removed.
4190 */
4191 rtnl_lock();
4192 if (!ipv6_add_dev(&loopback_dev))
4193 err = -ENOMEM;
4194 rtnl_unlock();
4195 if (err)
4196 return err;
4197
c62dba90
HX		 4198 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4199
1da177e4
LT		 4200 register_netdevice_notifier(&ipv6_dev_notf);
4201
1da177e4 4202 addrconf_verify(0);
c127ea2c
TG		 4203
4204 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4205 if (err < 0)
4206 goto errout;
4207
4208 /* Only the first call to __rtnl_register can fail */
4209 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4210 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4211 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4212 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4213 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4214
1da177e4
LT		 4215#ifdef CONFIG_SYSCTL
4216 addrconf_sysctl.sysctl_header =
0b4d4147 4217 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4218 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4219#endif
4220
4221 return 0;
c127ea2c
TG		 4222errout:
4223 unregister_netdevice_notifier(&ipv6_dev_notf);
4224
4225 return err;
1da177e4
LT		 4226}
4227
4228void __exit addrconf_cleanup(void)
4229{
1ab1457c
YH		 4230 struct net_device *dev;
4231 struct inet6_dev *idev;
4232 struct inet6_ifaddr *ifa;
1da177e4
LT		 4233 int i;
4234
4235 unregister_netdevice_notifier(&ipv6_dev_notf);
4236
1da177e4
LT		 4237#ifdef CONFIG_SYSCTL
4238 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4239 addrconf_sysctl_unregister(&ipv6_devconf);
4240#endif
4241
4242 rtnl_lock();
4243
4244 /*
4245 * clean dev list.
4246 */
4247
4248 for (dev=dev_base; dev; dev=dev->next) {
4249 if ((idev = __in6_dev_get(dev)) == NULL)
4250 continue;
4251 addrconf_ifdown(dev, 1);
4252 }
4253 addrconf_ifdown(&loopback_dev, 2);
4254
4255 /*
4256 * Check hash table.
4257 */
4258
4259 write_lock_bh(&addrconf_hash_lock);
4260 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4261 for (ifa=inet6_addr_lst[i]; ifa; ) {
4262 struct inet6_ifaddr *bifa;
4263
4264 bifa = ifa;
4265 ifa = ifa->lst_next;
4266 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4267 /* Do not free it; something is wrong.
4268 Now we can investigate it with debugger.
4269 */
4270 }
4271 }
4272 write_unlock_bh(&addrconf_hash_lock);
4273
4274 del_timer(&addr_chk_timer);
4275
4276 rtnl_unlock();
4277
1da177e4
LT		 4278#ifdef CONFIG_PROC_FS
4279 proc_net_remove("if_inet6");
4280#endif
4281}
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