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ipv6: Assume the loopback address in link-local scope.
[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 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4
LT		 45#include <linux/net.h>
46#include <linux/in6.h>
47#include <linux/netdevice.h>
1823730f 48#include <linux/if_addr.h>
1da177e4
LT		 49#include <linux/if_arp.h>
50#include <linux/if_arcnet.h>
51#include <linux/if_infiniband.h>
52#include <linux/route.h>
53#include <linux/inetdevice.h>
54#include <linux/init.h>
55#ifdef CONFIG_SYSCTL
56#include <linux/sysctl.h>
57#endif
4fc268d2 58#include <linux/capability.h>
1da177e4
LT		 59#include <linux/delay.h>
60#include <linux/notifier.h>
543537bd 61#include <linux/string.h>
1da177e4 62
457c4cbc 63#include <net/net_namespace.h>
1da177e4
LT		 64#include <net/sock.h>
65#include <net/snmp.h>
66
67#include <net/ipv6.h>
68#include <net/protocol.h>
69#include <net/ndisc.h>
70#include <net/ip6_route.h>
71#include <net/addrconf.h>
72#include <net/tcp.h>
73#include <net/ip.h>
5d620266 74#include <net/netlink.h>
f24e3d65 75#include <net/pkt_sched.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
f52295a9 102static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 103static void addrconf_sysctl_unregister(struct inet6_dev *idev);
104#else
105static inline void addrconf_sysctl_register(struct inet6_dev *idev)
106{
107}
108
109static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
110{
111}
1da177e4
LT		 112#endif
113
114#ifdef CONFIG_IPV6_PRIVACY
115static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 116static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 117static void ipv6_regen_rndid(unsigned long data);
118
119static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 120#endif
121
122static int ipv6_count_addresses(struct inet6_dev *idev);
123
124/*
125 * Configured unicast address hash table
126 */
127static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
128static DEFINE_RWLOCK(addrconf_hash_lock);
129
1da177e4
LT		 130static void addrconf_verify(unsigned long);
131
8d06afab 132static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 133static DEFINE_SPINLOCK(addrconf_verify_lock);
134
135static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
136static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
137
138static int addrconf_ifdown(struct net_device *dev, int how);
139
e431b8c0 140static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 141static void addrconf_dad_timer(unsigned long data);
142static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 143static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 144static void addrconf_rs_timer(unsigned long data);
145static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
146static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
147
1ab1457c 148static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 149 struct prefix_info *pinfo);
06bfe655
DL		 150static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
151 struct net_device *dev);
1da177e4 152
e041c683 153static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 154
ab32ea5d 155struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 156 .forwarding = 0,
157 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
158 .mtu6 = IPV6_MIN_MTU,
159 .accept_ra = 1,
160 .accept_redirects = 1,
161 .autoconf = 1,
162 .force_mld_version = 0,
163 .dad_transmits = 1,
164 .rtr_solicits = MAX_RTR_SOLICITATIONS,
165 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
166 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
167#ifdef CONFIG_IPV6_PRIVACY
168 .use_tempaddr = 0,
169 .temp_valid_lft = TEMP_VALID_LIFETIME,
170 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
171 .regen_max_retry = REGEN_MAX_RETRY,
172 .max_desync_factor = MAX_DESYNC_FACTOR,
173#endif
174 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 175 .accept_ra_defrtr = 1,
c4fd30eb 176 .accept_ra_pinfo = 1,
930d6ff2
YH		 177#ifdef CONFIG_IPV6_ROUTER_PREF
178 .accept_ra_rtr_pref = 1,
52e16356 179 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 180#ifdef CONFIG_IPV6_ROUTE_INFO
181 .accept_ra_rt_info_max_plen = 0,
182#endif
930d6ff2 183#endif
fbea49e1 184 .proxy_ndp = 0,
0bcbc926 185 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 186};
187
ab32ea5d 188static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 189 .forwarding = 0,
190 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
191 .mtu6 = IPV6_MIN_MTU,
192 .accept_ra = 1,
193 .accept_redirects = 1,
194 .autoconf = 1,
195 .dad_transmits = 1,
196 .rtr_solicits = MAX_RTR_SOLICITATIONS,
197 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
198 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
199#ifdef CONFIG_IPV6_PRIVACY
200 .use_tempaddr = 0,
201 .temp_valid_lft = TEMP_VALID_LIFETIME,
202 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
203 .regen_max_retry = REGEN_MAX_RETRY,
204 .max_desync_factor = MAX_DESYNC_FACTOR,
205#endif
206 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 207 .accept_ra_defrtr = 1,
c4fd30eb 208 .accept_ra_pinfo = 1,
930d6ff2
YH		 209#ifdef CONFIG_IPV6_ROUTER_PREF
210 .accept_ra_rtr_pref = 1,
52e16356 211 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 212#ifdef CONFIG_IPV6_ROUTE_INFO
213 .accept_ra_rt_info_max_plen = 0,
214#endif
930d6ff2 215#endif
fbea49e1 216 .proxy_ndp = 0,
0bcbc926 217 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 218};
219
220/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 221const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 222const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 223const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
224const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
2b5ead46
YH		 232/* Check if a route is valid prefix route */
233static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
234{
235 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
236}
237
1da177e4
LT		 238static void addrconf_del_timer(struct inet6_ifaddr *ifp)
239{
240 if (del_timer(&ifp->timer))
241 __in6_ifa_put(ifp);
242}
243
244enum addrconf_timer_t
245{
246 AC_NONE,
247 AC_DAD,
248 AC_RS,
249};
250
251static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
252 enum addrconf_timer_t what,
253 unsigned long when)
254{
255 if (!del_timer(&ifp->timer))
256 in6_ifa_hold(ifp);
257
258 switch (what) {
259 case AC_DAD:
260 ifp->timer.function = addrconf_dad_timer;
261 break;
262 case AC_RS:
263 ifp->timer.function = addrconf_rs_timer;
264 break;
265 default:;
266 }
267 ifp->timer.expires = jiffies + when;
268 add_timer(&ifp->timer);
269}
270
7f7d9a6b
HX		 271static int snmp6_alloc_dev(struct inet6_dev *idev)
272{
7f7d9a6b 273 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 274 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 275 goto err_ip;
276 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 277 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 278 goto err_icmp;
14878f75 279 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 280 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 281 goto err_icmpmsg;
7f7d9a6b
HX		 282
283 return 0;
284
14878f75
DS		 285err_icmpmsg:
286 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 287err_icmp:
288 snmp_mib_free((void **)idev->stats.ipv6);
289err_ip:
aaf70ec7 290 return -ENOMEM;
7f7d9a6b
HX		 291}
292
16910b98 293static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 294{
14878f75 295 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 296 snmp_mib_free((void **)idev->stats.icmpv6);
297 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 298}
299
1da177e4
LT		 300/* Nobody refers to this device, we may destroy it. */
301
8814c4b5
YH		 302static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
303{
304 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
305 kfree(idev);
306}
307
1da177e4
LT		 308void in6_dev_finish_destroy(struct inet6_dev *idev)
309{
310 struct net_device *dev = idev->dev;
311 BUG_TRAP(idev->addr_list==NULL);
312 BUG_TRAP(idev->mc_list==NULL);
313#ifdef NET_REFCNT_DEBUG
314 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
315#endif
316 dev_put(dev);
317 if (!idev->dead) {
318 printk("Freeing alive inet6 device %p\n", idev);
319 return;
320 }
321 snmp6_free_dev(idev);
8814c4b5 322 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 323}
324
7159039a
YH		 325EXPORT_SYMBOL(in6_dev_finish_destroy);
326
1da177e4
LT		 327static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
328{
329 struct inet6_dev *ndev;
330
331 ASSERT_RTNL();
332
333 if (dev->mtu < IPV6_MIN_MTU)
334 return NULL;
335
1ab1457c 336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 337
1ab1457c
YH		 338 if (ndev == NULL)
339 return NULL;
322f74a4
IO		 340
341 rwlock_init(&ndev->lock);
342 ndev->dev = dev;
c346dca1 343 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 344 ndev->cnf.mtu6 = dev->mtu;
345 ndev->cnf.sysctl = NULL;
346 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
347 if (ndev->nd_parms == NULL) {
348 kfree(ndev);
349 return NULL;
350 }
0187bdfb
BH		 351 if (ndev->cnf.forwarding)
352 dev_disable_lro(dev);
322f74a4
IO		 353 /* We refer to the device */
354 dev_hold(dev);
1da177e4 355
322f74a4
IO		 356 if (snmp6_alloc_dev(ndev) < 0) {
357 ADBG((KERN_WARNING
358 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 359 __func__, dev->name));
322f74a4
IO		 360 neigh_parms_release(&nd_tbl, ndev->nd_parms);
361 ndev->dead = 1;
362 in6_dev_finish_destroy(ndev);
363 return NULL;
364 }
1da177e4 365
322f74a4
IO		 366 if (snmp6_register_dev(ndev) < 0) {
367 ADBG((KERN_WARNING
368 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 369 __func__, dev->name));
322f74a4
IO		 370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 ndev->dead = 1;
372 in6_dev_finish_destroy(ndev);
373 return NULL;
374 }
375
376 /* One reference from device. We must do this before
377 * we invoke __ipv6_regen_rndid().
378 */
379 in6_dev_hold(ndev);
1da177e4 380
b077d7ab
YH		 381#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
382 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
383 printk(KERN_INFO
384 "%s: Disabled Multicast RS\n",
385 dev->name);
386 ndev->cnf.rtr_solicits = 0;
387 }
388#endif
389
1da177e4 390#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
9625ed72 394 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 395 dev->type == ARPHRD_SIT ||
0be669bb 396 dev->type == ARPHRD_NONE) {
322f74a4
IO		 397 printk(KERN_INFO
398 "%s: Disabled Privacy Extensions\n",
399 dev->name);
400 ndev->cnf.use_tempaddr = -1;
401 } else {
402 in6_dev_hold(ndev);
403 ipv6_regen_rndid((unsigned long) ndev);
404 }
1da177e4
LT		 405#endif
406
f24e3d65 407 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 408 ndev->if_flags |= IF_READY;
409
322f74a4
IO		 410 ipv6_mc_init_dev(ndev);
411 ndev->tstamp = jiffies;
f52295a9 412 addrconf_sysctl_register(ndev);
30c4cf57
DS		 413 /* protected by rtnl_lock */
414 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 415
416 /* Join all-node multicast group */
f3ee4010 417 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 418
1da177e4
LT		 419 return ndev;
420}
421
cee89473 422static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 423{
424 struct inet6_dev *idev;
425
426 ASSERT_RTNL();
427
428 if ((idev = __in6_dev_get(dev)) == NULL) {
429 if ((idev = ipv6_add_dev(dev)) == NULL)
430 return NULL;
431 }
c5e33bdd 432
1da177e4
LT		 433 if (dev->flags&IFF_UP)
434 ipv6_mc_up(idev);
435 return idev;
436}
437
438#ifdef CONFIG_SYSCTL
439static void dev_forward_change(struct inet6_dev *idev)
440{
441 struct net_device *dev;
442 struct inet6_ifaddr *ifa;
1da177e4
LT		 443
444 if (!idev)
445 return;
446 dev = idev->dev;
0187bdfb
BH		 447 if (idev->cnf.forwarding)
448 dev_disable_lro(dev);
1da177e4 449 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 450 if (idev->cnf.forwarding)
f3ee4010 451 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 452 else
f3ee4010 453 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 454 }
455 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 456 if (ifa->flags&IFA_F_TENTATIVE)
457 continue;
1da177e4
LT		 458 if (idev->cnf.forwarding)
459 addrconf_join_anycast(ifa);
460 else
461 addrconf_leave_anycast(ifa);
462 }
463}
464
465
e186932b 466static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 467{
468 struct net_device *dev;
469 struct inet6_dev *idev;
470
471 read_lock(&dev_base_lock);
bff16c2f 472 for_each_netdev(net, dev) {
8814c4b5 473 rcu_read_lock();
1da177e4
LT		 474 idev = __in6_dev_get(dev);
475 if (idev) {
e186932b
PE		 476 int changed = (!idev->cnf.forwarding) ^ (!newf);
477 idev->cnf.forwarding = newf;
1da177e4
LT		 478 if (changed)
479 dev_forward_change(idev);
480 }
8814c4b5 481 rcu_read_unlock();
1da177e4
LT		 482 }
483 read_unlock(&dev_base_lock);
484}
c8fecf22
PE		 485
486static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
487{
bff16c2f
PE		 488 struct net *net;
489
490 net = (struct net *)table->extra2;
441fc2a2 491 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 492 return;
493
0187bdfb 494 rtnl_lock();
e186932b
PE		 495 if (p == &net->ipv6.devconf_all->forwarding) {
496 __s32 newf = net->ipv6.devconf_all->forwarding;
497 net->ipv6.devconf_dflt->forwarding = newf;
498 addrconf_forward_change(net, newf);
c8fecf22
PE		 499 } else if ((!*p) ^ (!old))
500 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 501 rtnl_unlock();
c8fecf22
PE		 502
503 if (*p)
7b4da532 504 rt6_purge_dflt_routers(net);
c8fecf22 505}
1da177e4
LT		 506#endif
507
508/* Nobody refers to this ifaddr, destroy it */
509
510void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
511{
512 BUG_TRAP(ifp->if_next==NULL);
513 BUG_TRAP(ifp->lst_next==NULL);
514#ifdef NET_REFCNT_DEBUG
515 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
516#endif
517
518 in6_dev_put(ifp->idev);
519
520 if (del_timer(&ifp->timer))
521 printk("Timer is still running, when freeing ifa=%p\n", ifp);
522
523 if (!ifp->dead) {
524 printk("Freeing alive inet6 address %p\n", ifp);
525 return;
526 }
527 dst_release(&ifp->rt->u.dst);
528
529 kfree(ifp);
530}
531
e55ffac6
BH		 532static void
533ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
534{
535 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 536 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 537
538 /*
539 * Each device address list is sorted in order of scope -
540 * global before linklocal.
541 */
542 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
543 ifap = &ifa->if_next) {
8a6ce0c0 544 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 545 break;
546 }
547
548 ifp->if_next = *ifap;
549 *ifap = ifp;
550}
551
3eb84f49
YH		 552/*
553 * Hash function taken from net_alias.c
554 */
555static u8 ipv6_addr_hash(const struct in6_addr *addr)
556{
557 __u32 word;
558
559 /*
560 * We perform the hash function over the last 64 bits of the address
561 * This will include the IEEE address token on links that support it.
562 */
563
564 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
565 word ^= (word >> 16);
566 word ^= (word >> 8);
567
568 return ((word ^ (word >> 4)) & 0x0f);
569}
570
1da177e4
LT		 571/* On success it returns ifp with increased reference count */
572
573static struct inet6_ifaddr *
574ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 575 int scope, u32 flags)
1da177e4
LT		 576{
577 struct inet6_ifaddr *ifa = NULL;
578 struct rt6_info *rt;
579 int hash;
580 int err = 0;
d68b8270
YH		 581 int addr_type = ipv6_addr_type(addr);
582
583 if (addr_type == IPV6_ADDR_ANY ||
584 addr_type & IPV6_ADDR_MULTICAST ||
585 (!(idev->dev->flags & IFF_LOOPBACK) &&
586 addr_type & IPV6_ADDR_LOOPBACK))
587 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 588
8814c4b5 589 rcu_read_lock_bh();
1da177e4
LT		 590 if (idev->dead) {
591 err = -ENODEV; /*XXX*/
592 goto out2;
593 }
594
595 write_lock(&addrconf_hash_lock);
596
597 /* Ignore adding duplicate addresses on an interface */
c346dca1 598 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 599 ADBG(("ipv6_add_addr: already assigned\n"));
600 err = -EEXIST;
601 goto out;
602 }
603
322f74a4 604 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 605
606 if (ifa == NULL) {
607 ADBG(("ipv6_add_addr: malloc failed\n"));
608 err = -ENOBUFS;
609 goto out;
610 }
611
612 rt = addrconf_dst_alloc(idev, addr, 0);
613 if (IS_ERR(rt)) {
614 err = PTR_ERR(rt);
615 goto out;
616 }
617
1da177e4
LT		 618 ipv6_addr_copy(&ifa->addr, addr);
619
620 spin_lock_init(&ifa->lock);
621 init_timer(&ifa->timer);
622 ifa->timer.data = (unsigned long) ifa;
623 ifa->scope = scope;
624 ifa->prefix_len = pfxlen;
625 ifa->flags = flags | IFA_F_TENTATIVE;
626 ifa->cstamp = ifa->tstamp = jiffies;
627
57f5f544
KF		 628 ifa->rt = rt;
629
95c385b4
NH		 630 /*
631 * part one of RFC 4429, section 3.3
632 * We should not configure an address as
633 * optimistic if we do not yet know the link
634 * layer address of our nexhop router
635 */
636
637 if (rt->rt6i_nexthop == NULL)
638 ifa->flags &= ~IFA_F_OPTIMISTIC;
639
1da177e4
LT		 640 ifa->idev = idev;
641 in6_dev_hold(idev);
642 /* For caller */
643 in6_ifa_hold(ifa);
644
645 /* Add to big hash table */
646 hash = ipv6_addr_hash(addr);
647
648 ifa->lst_next = inet6_addr_lst[hash];
649 inet6_addr_lst[hash] = ifa;
650 in6_ifa_hold(ifa);
651 write_unlock(&addrconf_hash_lock);
652
653 write_lock(&idev->lock);
654 /* Add to inet6_dev unicast addr list. */
e55ffac6 655 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 656
657#ifdef CONFIG_IPV6_PRIVACY
658 if (ifa->flags&IFA_F_TEMPORARY) {
659 ifa->tmp_next = idev->tempaddr_list;
660 idev->tempaddr_list = ifa;
661 in6_ifa_hold(ifa);
662 }
663#endif
664
1da177e4
LT		 665 in6_ifa_hold(ifa);
666 write_unlock(&idev->lock);
667out2:
8814c4b5 668 rcu_read_unlock_bh();
1da177e4 669
fd92833a 670 if (likely(err == 0))
e041c683 671 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 672 else {
673 kfree(ifa);
674 ifa = ERR_PTR(err);
675 }
676
677 return ifa;
678out:
679 write_unlock(&addrconf_hash_lock);
680 goto out2;
681}
682
683/* This function wants to get referenced ifp and releases it before return */
684
685static void ipv6_del_addr(struct inet6_ifaddr *ifp)
686{
687 struct inet6_ifaddr *ifa, **ifap;
688 struct inet6_dev *idev = ifp->idev;
689 int hash;
690 int deleted = 0, onlink = 0;
691 unsigned long expires = jiffies;
692
693 hash = ipv6_addr_hash(&ifp->addr);
694
695 ifp->dead = 1;
696
697 write_lock_bh(&addrconf_hash_lock);
698 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
699 ifap = &ifa->lst_next) {
700 if (ifa == ifp) {
701 *ifap = ifa->lst_next;
702 __in6_ifa_put(ifp);
703 ifa->lst_next = NULL;
704 break;
705 }
706 }
707 write_unlock_bh(&addrconf_hash_lock);
708
709 write_lock_bh(&idev->lock);
710#ifdef CONFIG_IPV6_PRIVACY
711 if (ifp->flags&IFA_F_TEMPORARY) {
712 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
713 ifap = &ifa->tmp_next) {
714 if (ifa == ifp) {
715 *ifap = ifa->tmp_next;
716 if (ifp->ifpub) {
717 in6_ifa_put(ifp->ifpub);
718 ifp->ifpub = NULL;
719 }
720 __in6_ifa_put(ifp);
721 ifa->tmp_next = NULL;
722 break;
723 }
724 }
725 }
726#endif
727
1d142804 728 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 729 if (ifa == ifp) {
730 *ifap = ifa->if_next;
731 __in6_ifa_put(ifp);
732 ifa->if_next = NULL;
733 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
734 break;
735 deleted = 1;
1d142804 736 continue;
1da177e4
LT		 737 } else if (ifp->flags & IFA_F_PERMANENT) {
738 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
739 ifp->prefix_len)) {
740 if (ifa->flags & IFA_F_PERMANENT) {
741 onlink = 1;
742 if (deleted)
743 break;
744 } else {
745 unsigned long lifetime;
746
747 if (!onlink)
748 onlink = -1;
749
750 spin_lock(&ifa->lock);
4bed72e4
YH		 751
752 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
753 /*
754 * Note: Because this address is
755 * not permanent, lifetime <
756 * LONG_MAX / HZ here.
757 */
1da177e4
LT		 758 if (time_before(expires,
759 ifa->tstamp + lifetime * HZ))
760 expires = ifa->tstamp + lifetime * HZ;
761 spin_unlock(&ifa->lock);
762 }
763 }
764 }
1d142804 765 ifap = &ifa->if_next;
1da177e4
LT		 766 }
767 write_unlock_bh(&idev->lock);
768
769 ipv6_ifa_notify(RTM_DELADDR, ifp);
770
e041c683 771 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 772
773 addrconf_del_timer(ifp);
774
775 /*
776 * Purge or update corresponding prefix
777 *
778 * 1) we don't purge prefix here if address was not permanent.
779 * prefix is managed by its own lifetime.
780 * 2) if there're no addresses, delete prefix.
781 * 3) if there're still other permanent address(es),
782 * corresponding prefix is still permanent.
783 * 4) otherwise, update prefix lifetime to the
784 * longest valid lifetime among the corresponding
785 * addresses on the device.
786 * Note: subsequent RA will update lifetime.
787 *
788 * --yoshfuji
789 */
790 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
791 struct in6_addr prefix;
792 struct rt6_info *rt;
c346dca1 793 struct net *net = dev_net(ifp->idev->dev);
1da177e4 794 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 795 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 796
2b5ead46 797 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 798 if (onlink == 0) {
e0a1ad73 799 ip6_del_rt(rt);
1da177e4
LT		 800 rt = NULL;
801 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
802 rt->rt6i_expires = expires;
803 rt->rt6i_flags |= RTF_EXPIRES;
804 }
805 }
806 dst_release(&rt->u.dst);
807 }
808
809 in6_ifa_put(ifp);
810}
811
812#ifdef CONFIG_IPV6_PRIVACY
813static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
814{
815 struct inet6_dev *idev = ifp->idev;
816 struct in6_addr addr, *tmpaddr;
817 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 818 unsigned long regen_advance;
1da177e4
LT		 819 int tmp_plen;
820 int ret = 0;
821 int max_addresses;
95c385b4 822 u32 addr_flags;
1da177e4
LT		 823
824 write_lock(&idev->lock);
825 if (ift) {
826 spin_lock_bh(&ift->lock);
827 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
828 spin_unlock_bh(&ift->lock);
829 tmpaddr = &addr;
830 } else {
831 tmpaddr = NULL;
832 }
833retry:
834 in6_dev_hold(idev);
835 if (idev->cnf.use_tempaddr <= 0) {
836 write_unlock(&idev->lock);
837 printk(KERN_INFO
838 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
839 in6_dev_put(idev);
840 ret = -1;
841 goto out;
842 }
843 spin_lock_bh(&ifp->lock);
844 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
845 idev->cnf.use_tempaddr = -1; /*XXX*/
846 spin_unlock_bh(&ifp->lock);
847 write_unlock(&idev->lock);
848 printk(KERN_WARNING
849 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
850 in6_dev_put(idev);
851 ret = -1;
852 goto out;
853 }
854 in6_ifa_hold(ifp);
855 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
856 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
859 printk(KERN_WARNING
860 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
861 in6_ifa_put(ifp);
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 memcpy(&addr.s6_addr[8], idev->rndid, 8);
867 tmp_valid_lft = min_t(__u32,
868 ifp->valid_lft,
869 idev->cnf.temp_valid_lft);
1ab1457c
YH		 870 tmp_prefered_lft = min_t(__u32,
871 ifp->prefered_lft,
1da177e4
LT		 872 idev->cnf.temp_prefered_lft - desync_factor / HZ);
873 tmp_plen = ifp->prefix_len;
874 max_addresses = idev->cnf.max_addresses;
875 tmp_cstamp = ifp->cstamp;
876 tmp_tstamp = ifp->tstamp;
877 spin_unlock_bh(&ifp->lock);
878
eac55bf9
BB		 879 regen_advance = idev->cnf.regen_max_retry *
880 idev->cnf.dad_transmits *
881 idev->nd_parms->retrans_time / HZ;
1da177e4 882 write_unlock(&idev->lock);
95c385b4 883
eac55bf9
BB		 884 /* A temporary address is created only if this calculated Preferred
885 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
886 * an implementation must not create a temporary address with a zero
887 * Preferred Lifetime.
888 */
889 if (tmp_prefered_lft <= regen_advance) {
890 in6_ifa_put(ifp);
891 in6_dev_put(idev);
892 ret = -1;
893 goto out;
894 }
895
95c385b4
NH		 896 addr_flags = IFA_F_TEMPORARY;
897 /* set in addrconf_prefix_rcv() */
898 if (ifp->flags & IFA_F_OPTIMISTIC)
899 addr_flags |= IFA_F_OPTIMISTIC;
900
1da177e4 901 ift = !max_addresses ||
1ab1457c 902 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 903 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 904 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
905 addr_flags) : NULL;
1da177e4
LT		 906 if (!ift || IS_ERR(ift)) {
907 in6_ifa_put(ifp);
908 in6_dev_put(idev);
909 printk(KERN_INFO
910 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
911 tmpaddr = &addr;
912 write_lock(&idev->lock);
913 goto retry;
914 }
915
916 spin_lock_bh(&ift->lock);
917 ift->ifpub = ifp;
918 ift->valid_lft = tmp_valid_lft;
919 ift->prefered_lft = tmp_prefered_lft;
920 ift->cstamp = tmp_cstamp;
921 ift->tstamp = tmp_tstamp;
922 spin_unlock_bh(&ift->lock);
923
924 addrconf_dad_start(ift, 0);
925 in6_ifa_put(ift);
926 in6_dev_put(idev);
927out:
928 return ret;
929}
930#endif
931
932/*
072047e4 933 * Choose an appropriate source address (RFC3484)
1da177e4 934 */
a9b05723
YH		 935enum {
936 IPV6_SADDR_RULE_INIT = 0,
937 IPV6_SADDR_RULE_LOCAL,
938 IPV6_SADDR_RULE_SCOPE,
939 IPV6_SADDR_RULE_PREFERRED,
940#ifdef CONFIG_IPV6_MIP6
941 IPV6_SADDR_RULE_HOA,
942#endif
943 IPV6_SADDR_RULE_OIF,
944 IPV6_SADDR_RULE_LABEL,
945#ifdef CONFIG_IPV6_PRIVACY
946 IPV6_SADDR_RULE_PRIVACY,
947#endif
948 IPV6_SADDR_RULE_ORCHID,
949 IPV6_SADDR_RULE_PREFIX,
950 IPV6_SADDR_RULE_MAX
951};
952
072047e4 953struct ipv6_saddr_score {
a9b05723
YH		 954 int rule;
955 int addr_type;
956 struct inet6_ifaddr *ifa;
957 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
958 int scopedist;
959 int matchlen;
072047e4
YH		 960};
961
a9b05723 962struct ipv6_saddr_dst {
9acd9f3a 963 const struct in6_addr *addr;
a9b05723
YH		 964 int ifindex;
965 int scope;
966 int label;
7cbca67c 967 unsigned int prefs;
a9b05723 968};
072047e4 969
b6f99a21 970static inline int ipv6_saddr_preferred(int type)
1da177e4 971{
072047e4
YH		 972 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
973 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
974 return 1;
975 return 0;
1da177e4
LT		 976}
977
3de23255
BT		 978static int ipv6_get_saddr_eval(struct net *net,
979 struct ipv6_saddr_score *score,
a9b05723
YH		 980 struct ipv6_saddr_dst *dst,
981 int i)
982{
983 int ret;
984
985 if (i <= score->rule) {
986 switch (i) {
987 case IPV6_SADDR_RULE_SCOPE:
988 ret = score->scopedist;
989 break;
990 case IPV6_SADDR_RULE_PREFIX:
991 ret = score->matchlen;
992 break;
993 default:
994 ret = !!test_bit(i, score->scorebits);
995 }
996 goto out;
997 }
998
999 switch (i) {
1000 case IPV6_SADDR_RULE_INIT:
1001 /* Rule 0: remember if hiscore is not ready yet */
1002 ret = !!score->ifa;
1003 break;
1004 case IPV6_SADDR_RULE_LOCAL:
1005 /* Rule 1: Prefer same address */
1006 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1007 break;
1008 case IPV6_SADDR_RULE_SCOPE:
1009 /* Rule 2: Prefer appropriate scope
1010 *
1011 * ret
1012 * ^
1013 * -1 | d 15
1014 * ---+--+-+---> scope
1015 * |
1016 * | d is scope of the destination.
1017 * B-d | \
1018 * | \ <- smaller scope is better if
1019 * B-15 | \ if scope is enough for destinaion.
1020 * | ret = B - scope (-1 <= scope >= d <= 15).
1021 * d-C-1 | /
1022 * |/ <- greater is better
1023 * -C / if scope is not enough for destination.
1024 * /| ret = scope - C (-1 <= d < scope <= 15).
1025 *
1026 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1027 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1028 * Assume B = 0 and we get C > 29.
1029 */
1030 ret = __ipv6_addr_src_scope(score->addr_type);
1031 if (ret >= dst->scope)
1032 ret = -ret;
1033 else
1034 ret -= 128; /* 30 is enough */
1035 score->scopedist = ret;
1036 break;
1037 case IPV6_SADDR_RULE_PREFERRED:
1038 /* Rule 3: Avoid deprecated and optimistic addresses */
1039 ret = ipv6_saddr_preferred(score->addr_type) ||
1040 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1041 break;
1042#ifdef CONFIG_IPV6_MIP6
1043 case IPV6_SADDR_RULE_HOA:
7cbca67c 1044 {
a9b05723 1045 /* Rule 4: Prefer home address */
7cbca67c
YH		 1046 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1047 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1048 break;
7cbca67c 1049 }
a9b05723
YH		 1050#endif
1051 case IPV6_SADDR_RULE_OIF:
1052 /* Rule 5: Prefer outgoing interface */
1053 ret = (!dst->ifindex ||
1054 dst->ifindex == score->ifa->idev->dev->ifindex);
1055 break;
1056 case IPV6_SADDR_RULE_LABEL:
1057 /* Rule 6: Prefer matching label */
3de23255
BT		 1058 ret = ipv6_addr_label(net,
1059 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1060 score->ifa->idev->dev->ifindex) == dst->label;
1061 break;
1062#ifdef CONFIG_IPV6_PRIVACY
1063 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1064 {
a9b05723
YH		 1065 /* Rule 7: Prefer public address
1066 * Note: prefer temprary address if use_tempaddr >= 2
1067 */
7cbca67c
YH		 1068 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1069 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1070 score->ifa->idev->cnf.use_tempaddr >= 2;
1071 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1072 break;
7cbca67c 1073 }
a9b05723
YH		 1074#endif
1075 case IPV6_SADDR_RULE_ORCHID:
1076 /* Rule 8-: Prefer ORCHID vs ORCHID or
1077 * non-ORCHID vs non-ORCHID
1078 */
1079 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1080 ipv6_addr_orchid(dst->addr));
1081 break;
1082 case IPV6_SADDR_RULE_PREFIX:
1083 /* Rule 8: Use longest matching prefix */
1084 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1085 dst->addr);
1086 break;
1087 default:
1088 ret = 0;
1089 }
1090
1091 if (ret)
1092 __set_bit(i, score->scorebits);
1093 score->rule = i;
1094out:
1095 return ret;
1096}
1097
1098int ipv6_dev_get_saddr(struct net_device *dst_dev,
9acd9f3a 1099 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1100 struct in6_addr *saddr)
1da177e4 1101{
a9b05723
YH		 1102 struct ipv6_saddr_score scores[2],
1103 *score = &scores[0], *hiscore = &scores[1];
c346dca1 1104 struct net *net = dev_net(dst_dev);
a9b05723 1105 struct ipv6_saddr_dst dst;
072047e4 1106 struct net_device *dev;
a9b05723 1107 int dst_type;
1da177e4 1108
a9b05723
YH		 1109 dst_type = __ipv6_addr_type(daddr);
1110 dst.addr = daddr;
1111 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1112 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1113 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1114 dst.prefs = prefs;
a9b05723
YH		 1115
1116 hiscore->rule = -1;
1117 hiscore->ifa = NULL;
1da177e4 1118
072047e4 1119 read_lock(&dev_base_lock);
8814c4b5 1120 rcu_read_lock();
1da177e4 1121
6fda7350 1122 for_each_netdev(net, dev) {
072047e4 1123 struct inet6_dev *idev;
072047e4 1124
a9b05723 1125 /* Candidate Source Address (section 4)
072047e4
YH		 1126 * - multicast and link-local destination address,
1127 * the set of candidate source address MUST only
1128 * include addresses assigned to interfaces
1129 * belonging to the same link as the outgoing
1130 * interface.
1131 * (- For site-local destination addresses, the
1132 * set of candidate source addresses MUST only
1133 * include addresses assigned to interfaces
1134 * belonging to the same site as the outgoing
1135 * interface.)
1136 */
a9b05723
YH		 1137 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1138 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1139 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1140 continue;
1da177e4 1141
1da177e4 1142 idev = __in6_dev_get(dev);
072047e4
YH		 1143 if (!idev)
1144 continue;
1145
1146 read_lock_bh(&idev->lock);
a9b05723
YH		 1147 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1148 int i;
072047e4 1149
a9b05723 1150 /*
6b3ae80a
YH		 1151 * - Tentative Address (RFC2462 section 5.4)
1152 * - A tentative address is not considered
1153 * "assigned to an interface" in the traditional
95c385b4 1154 * sense, unless it is also flagged as optimistic.
6b3ae80a 1155 * - Candidate Source Address (section 4)
072047e4
YH		 1156 * - In any case, anycast addresses, multicast
1157 * addresses, and the unspecified address MUST
1158 * NOT be included in a candidate set.
1159 */
a9b05723
YH		 1160 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1161 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1162 continue;
a9b05723
YH		 1163
1164 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1165
1166 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1167 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1168 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1169 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1170 "assigned as unicast address on %s",
1171 dev->name);
1172 continue;
1173 }
1174
a9b05723
YH		 1175 score->rule = -1;
1176 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1177
1178 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1179 int minihiscore, miniscore;
1180
3de23255
BT		 1181 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1182 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1183
1184 if (minihiscore > miniscore) {
1185 if (i == IPV6_SADDR_RULE_SCOPE &&
1186 score->scopedist > 0) {
1187 /*
1188 * special case:
1189 * each remaining entry
1190 * has too small (not enough)
1191 * scope, because ifa entries
1192 * are sorted by their scope
1193 * values.
1194 */
1195 goto try_nextdev;
1196 }
1197 break;
1198 } else if (minihiscore < miniscore) {
1199 struct ipv6_saddr_score *tmp;
1200
1201 if (hiscore->ifa)
1202 in6_ifa_put(hiscore->ifa);
1203
1204 in6_ifa_hold(score->ifa);
1205
1206 tmp = hiscore;
1207 hiscore = score;
1208 score = tmp;
1209
1210 /* restore our iterator */
1211 score->ifa = hiscore->ifa;
1212
1213 break;
1da177e4 1214 }
072047e4 1215 }
1da177e4 1216 }
a9b05723 1217try_nextdev:
072047e4 1218 read_unlock_bh(&idev->lock);
1da177e4 1219 }
8814c4b5 1220 rcu_read_unlock();
1da177e4
LT		 1221 read_unlock(&dev_base_lock);
1222
a9b05723 1223 if (!hiscore->ifa)
072047e4 1224 return -EADDRNOTAVAIL;
1ab1457c 1225
a9b05723
YH		 1226 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1227 in6_ifa_put(hiscore->ifa);
072047e4 1228 return 0;
1da177e4
LT		 1229}
1230
5e5f3f0f 1231EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1232
95c385b4
NH		 1233int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1234 unsigned char banned_flags)
1da177e4
LT		 1235{
1236 struct inet6_dev *idev;
1237 int err = -EADDRNOTAVAIL;
1238
8814c4b5 1239 rcu_read_lock();
1da177e4
LT		 1240 if ((idev = __in6_dev_get(dev)) != NULL) {
1241 struct inet6_ifaddr *ifp;
1242
1243 read_lock_bh(&idev->lock);
1244 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1245 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1246 ipv6_addr_copy(addr, &ifp->addr);
1247 err = 0;
1248 break;
1249 }
1250 }
1251 read_unlock_bh(&idev->lock);
1252 }
8814c4b5 1253 rcu_read_unlock();
1da177e4
LT		 1254 return err;
1255}
1256
1257static int ipv6_count_addresses(struct inet6_dev *idev)
1258{
1259 int cnt = 0;
1260 struct inet6_ifaddr *ifp;
1261
1262 read_lock_bh(&idev->lock);
1263 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1264 cnt++;
1265 read_unlock_bh(&idev->lock);
1266 return cnt;
1267}
1268
bfeade08
DL		 1269int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1270 struct net_device *dev, int strict)
1da177e4
LT		 1271{
1272 struct inet6_ifaddr * ifp;
1273 u8 hash = ipv6_addr_hash(addr);
1274
1275 read_lock_bh(&addrconf_hash_lock);
1276 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1277 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1278 continue;
1da177e4
LT		 1279 if (ipv6_addr_equal(&ifp->addr, addr) &&
1280 !(ifp->flags&IFA_F_TENTATIVE)) {
1281 if (dev == NULL || ifp->idev->dev == dev ||
1282 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1283 break;
1284 }
1285 }
1286 read_unlock_bh(&addrconf_hash_lock);
1287 return ifp != NULL;
1288}
7159039a
YH		 1289EXPORT_SYMBOL(ipv6_chk_addr);
1290
1da177e4 1291static
06bfe655
DL		 1292int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1293 struct net_device *dev)
1da177e4
LT		 1294{
1295 struct inet6_ifaddr * ifp;
1296 u8 hash = ipv6_addr_hash(addr);
1297
1298 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1299 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1300 continue;
1da177e4
LT		 1301 if (ipv6_addr_equal(&ifp->addr, addr)) {
1302 if (dev == NULL || ifp->idev->dev == dev)
1303 break;
1304 }
1305 }
1306 return ifp != NULL;
1307}
1308
52eeeb84
YH		 1309int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1310{
1311 struct inet6_dev *idev;
1312 struct inet6_ifaddr *ifa;
1313 int onlink;
1314
1315 onlink = 0;
1316 rcu_read_lock();
1317 idev = __in6_dev_get(dev);
1318 if (idev) {
1319 read_lock_bh(&idev->lock);
1320 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1321 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1322 ifa->prefix_len);
1323 if (onlink)
1324 break;
1325 }
1326 read_unlock_bh(&idev->lock);
1327 }
1328 rcu_read_unlock();
1329 return onlink;
1330}
1331
1332EXPORT_SYMBOL(ipv6_chk_prefix);
1333
9acd9f3a 1334struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1335 struct net_device *dev, int strict)
1da177e4
LT		 1336{
1337 struct inet6_ifaddr * ifp;
1338 u8 hash = ipv6_addr_hash(addr);
1339
1340 read_lock_bh(&addrconf_hash_lock);
1341 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1342 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1343 continue;
1da177e4
LT		 1344 if (ipv6_addr_equal(&ifp->addr, addr)) {
1345 if (dev == NULL || ifp->idev->dev == dev ||
1346 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1347 in6_ifa_hold(ifp);
1348 break;
1349 }
1350 }
1351 }
1352 read_unlock_bh(&addrconf_hash_lock);
1353
1354 return ifp;
1355}
1356
1357int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1358{
1359 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1360 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1361 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1362 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1363 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1364 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1365 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1366 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1367
1368 if (!sk2_rcv_saddr && !sk_ipv6only)
1369 return 1;
1370
1371 if (addr_type2 == IPV6_ADDR_ANY &&
1372 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1373 return 1;
1374
1375 if (addr_type == IPV6_ADDR_ANY &&
1376 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1377 return 1;
1378
1379 if (sk2_rcv_saddr6 &&
1380 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1381 return 1;
1382
1383 if (addr_type == IPV6_ADDR_MAPPED &&
1384 !sk2_ipv6only &&
1385 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1386 return 1;
1387
1388 return 0;
1389}
1390
1391/* Gets referenced address, destroys ifaddr */
1392
9f5336e2 1393static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1394{
1da177e4
LT		 1395 if (ifp->flags&IFA_F_PERMANENT) {
1396 spin_lock_bh(&ifp->lock);
1397 addrconf_del_timer(ifp);
1398 ifp->flags |= IFA_F_TENTATIVE;
1399 spin_unlock_bh(&ifp->lock);
1400 in6_ifa_put(ifp);
1401#ifdef CONFIG_IPV6_PRIVACY
1402 } else if (ifp->flags&IFA_F_TEMPORARY) {
1403 struct inet6_ifaddr *ifpub;
1404 spin_lock_bh(&ifp->lock);
1405 ifpub = ifp->ifpub;
1406 if (ifpub) {
1407 in6_ifa_hold(ifpub);
1408 spin_unlock_bh(&ifp->lock);
1409 ipv6_create_tempaddr(ifpub, ifp);
1410 in6_ifa_put(ifpub);
1411 } else {
1412 spin_unlock_bh(&ifp->lock);
1413 }
1414 ipv6_del_addr(ifp);
1415#endif
1416 } else
1417 ipv6_del_addr(ifp);
1418}
1419
3c21edbd
YH		 1420void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1421{
1422 if (net_ratelimit())
1423 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1424 addrconf_dad_stop(ifp);
1425}
1da177e4
LT		 1426
1427/* Join to solicited addr multicast group. */
1428
1429void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1430{
1431 struct in6_addr maddr;
1432
1433 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1434 return;
1435
1436 addrconf_addr_solict_mult(addr, &maddr);
1437 ipv6_dev_mc_inc(dev, &maddr);
1438}
1439
1440void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1441{
1442 struct in6_addr maddr;
1443
1444 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1445 return;
1446
1447 addrconf_addr_solict_mult(addr, &maddr);
1448 __ipv6_dev_mc_dec(idev, &maddr);
1449}
1450
20380731 1451static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1452{
1453 struct in6_addr addr;
1454 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1455 if (ipv6_addr_any(&addr))
1456 return;
1457 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1458}
1459
20380731 1460static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1461{
1462 struct in6_addr addr;
1463 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1464 if (ipv6_addr_any(&addr))
1465 return;
1466 __ipv6_dev_ac_dec(ifp->idev, &addr);
1467}
1468
073a8e0e
YH		 1469static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1470{
1471 if (dev->addr_len != ETH_ALEN)
1472 return -1;
1473 memcpy(eui, dev->dev_addr, 3);
1474 memcpy(eui + 5, dev->dev_addr + 3, 3);
1475
1476 /*
1477 * The zSeries OSA network cards can be shared among various
1478 * OS instances, but the OSA cards have only one MAC address.
1479 * This leads to duplicate address conflicts in conjunction
1480 * with IPv6 if more than one instance uses the same card.
1481 *
1482 * The driver for these cards can deliver a unique 16-bit
1483 * identifier for each instance sharing the same card. It is
1484 * placed instead of 0xFFFE in the interface identifier. The
1485 * "u" bit of the interface identifier is not inverted in this
1486 * case. Hence the resulting interface identifier has local
1487 * scope according to RFC2373.
1488 */
1489 if (dev->dev_id) {
1490 eui[3] = (dev->dev_id >> 8) & 0xFF;
1491 eui[4] = dev->dev_id & 0xFF;
1492 } else {
1493 eui[3] = 0xFF;
1494 eui[4] = 0xFE;
1495 eui[0] ^= 2;
1496 }
1497 return 0;
1498}
1499
1500static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1501{
1502 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1503 if (dev->addr_len != ARCNET_ALEN)
1504 return -1;
1505 memset(eui, 0, 7);
1506 eui[7] = *(u8*)dev->dev_addr;
1507 return 0;
1508}
1509
1510static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1511{
1512 if (dev->addr_len != INFINIBAND_ALEN)
1513 return -1;
1514 memcpy(eui, dev->dev_addr + 12, 8);
1515 eui[0] |= 2;
1516 return 0;
1517}
1518
dfd982ba
YH		 1519int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1520{
1521 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1522 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1523 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1524 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1525 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1526 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1527 eui[1] = 0;
1528 eui[2] = 0x5E;
1529 eui[3] = 0xFE;
1530 memcpy(eui + 4, &addr, 4);
1531 return 0;
1532}
1533EXPORT_SYMBOL(__ipv6_isatap_ifid);
1534
1535static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1536{
1537 if (dev->priv_flags & IFF_ISATAP)
1538 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1539 return -1;
1540}
1541
1da177e4
LT		 1542static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1543{
1544 switch (dev->type) {
1545 case ARPHRD_ETHER:
1546 case ARPHRD_FDDI:
1547 case ARPHRD_IEEE802_TR:
073a8e0e 1548 return addrconf_ifid_eui48(eui, dev);
1da177e4 1549 case ARPHRD_ARCNET:
073a8e0e 1550 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1551 case ARPHRD_INFINIBAND:
073a8e0e 1552 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1553 case ARPHRD_SIT:
dfd982ba 1554 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1555 }
1556 return -1;
1557}
1558
1559static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1560{
1561 int err = -1;
1562 struct inet6_ifaddr *ifp;
1563
1564 read_lock_bh(&idev->lock);
1565 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1566 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1567 memcpy(eui, ifp->addr.s6_addr+8, 8);
1568 err = 0;
1569 break;
1570 }
1571 }
1572 read_unlock_bh(&idev->lock);
1573 return err;
1574}
1575
1576#ifdef CONFIG_IPV6_PRIVACY
1577/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1578static int __ipv6_regen_rndid(struct inet6_dev *idev)
1579{
1da177e4 1580regen:
955189ef 1581 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1582 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1583
1584 /*
1585 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1586 * check if generated address is not inappropriate
1587 *
1588 * - Reserved subnet anycast (RFC 2526)
1589 * 11111101 11....11 1xxxxxxx
c7dc89c0 1590 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1591 * 00-00-5E-FE-xx-xx-xx-xx
1592 * - value 0
1593 * - XXX: already assigned to an address on the device
1594 */
1ab1457c 1595 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1596 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1597 (idev->rndid[7]&0x80))
1598 goto regen;
1599 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1600 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1601 goto regen;
1602 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1603 goto regen;
1604 }
1605
1606 return 0;
1607}
1608
1609static void ipv6_regen_rndid(unsigned long data)
1610{
1611 struct inet6_dev *idev = (struct inet6_dev *) data;
1612 unsigned long expires;
1613
8814c4b5 1614 rcu_read_lock_bh();
1da177e4
LT		 1615 write_lock_bh(&idev->lock);
1616
1617 if (idev->dead)
1618 goto out;
1619
1620 if (__ipv6_regen_rndid(idev) < 0)
1621 goto out;
1ab1457c 1622
1da177e4 1623 expires = jiffies +
1ab1457c 1624 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1625 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1626 if (time_before(expires, jiffies)) {
1627 printk(KERN_WARNING
1628 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1629 idev->dev->name);
1630 goto out;
1631 }
1632
1633 if (!mod_timer(&idev->regen_timer, expires))
1634 in6_dev_hold(idev);
1635
1636out:
1637 write_unlock_bh(&idev->lock);
8814c4b5 1638 rcu_read_unlock_bh();
1da177e4
LT		 1639 in6_dev_put(idev);
1640}
1641
1642static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1643 int ret = 0;
1644
1645 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1646 ret = __ipv6_regen_rndid(idev);
1647 return ret;
1648}
1649#endif
1650
1651/*
1652 * Add prefix route.
1653 */
1654
1655static void
1656addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1657 unsigned long expires, u32 flags)
1da177e4 1658{
86872cb5
TG		 1659 struct fib6_config cfg = {
1660 .fc_table = RT6_TABLE_PREFIX,
1661 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1662 .fc_ifindex = dev->ifindex,
1663 .fc_expires = expires,
1664 .fc_dst_len = plen,
1665 .fc_flags = RTF_UP | flags,
c346dca1 1666 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1667 };
1da177e4 1668
86872cb5 1669 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1670
1671 /* Prevent useless cloning on PtP SIT.
1672 This thing is done here expecting that the whole
1673 class of non-broadcast devices need not cloning.
1674 */
0be669bb 1675#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1676 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1677 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1678#endif
1da177e4 1679
86872cb5 1680 ip6_route_add(&cfg);
1da177e4
LT		 1681}
1682
1683/* Create "default" multicast route to the interface */
1684
1685static void addrconf_add_mroute(struct net_device *dev)
1686{
86872cb5
TG		 1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_LOCAL,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_dst_len = 8,
1692 .fc_flags = RTF_UP,
c346dca1 1693 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1694 };
1695
1696 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1697
1698 ip6_route_add(&cfg);
1da177e4
LT		 1699}
1700
0be669bb 1701#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1702static void sit_route_add(struct net_device *dev)
1703{
86872cb5
TG		 1704 struct fib6_config cfg = {
1705 .fc_table = RT6_TABLE_MAIN,
1706 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1707 .fc_ifindex = dev->ifindex,
1708 .fc_dst_len = 96,
1709 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1710 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1711 };
1da177e4
LT		 1712
1713 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1714 ip6_route_add(&cfg);
1da177e4 1715}
0be669bb 1716#endif
1da177e4
LT		 1717
1718static void addrconf_add_lroute(struct net_device *dev)
1719{
1720 struct in6_addr addr;
1721
1722 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1723 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1724}
1725
1726static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1727{
1728 struct inet6_dev *idev;
1729
1730 ASSERT_RTNL();
1731
1732 if ((idev = ipv6_find_idev(dev)) == NULL)
1733 return NULL;
1734
1735 /* Add default multicast route */
1736 addrconf_add_mroute(dev);
1737
1738 /* Add link local route */
1739 addrconf_add_lroute(dev);
1740 return idev;
1741}
1742
1743void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1744{
1745 struct prefix_info *pinfo;
1746 __u32 valid_lft;
1747 __u32 prefered_lft;
1748 int addr_type;
1da177e4
LT		 1749 struct inet6_dev *in6_dev;
1750
1751 pinfo = (struct prefix_info *) opt;
1ab1457c 1752
1da177e4
LT		 1753 if (len < sizeof(struct prefix_info)) {
1754 ADBG(("addrconf: prefix option too short\n"));
1755 return;
1756 }
1ab1457c 1757
1da177e4
LT		 1758 /*
1759 * Validation checks ([ADDRCONF], page 19)
1760 */
1761
1762 addr_type = ipv6_addr_type(&pinfo->prefix);
1763
1764 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1765 return;
1766
1767 valid_lft = ntohl(pinfo->valid);
1768 prefered_lft = ntohl(pinfo->prefered);
1769
1770 if (prefered_lft > valid_lft) {
1771 if (net_ratelimit())
1772 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1773 return;
1774 }
1775
1776 in6_dev = in6_dev_get(dev);
1777
1778 if (in6_dev == NULL) {
1779 if (net_ratelimit())
1780 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1781 return;
1782 }
1783
1784 /*
1785 * Two things going on here:
1786 * 1) Add routes for on-link prefixes
1787 * 2) Configure prefixes with the auto flag set
1788 */
1789
4bed72e4
YH		 1790 if (pinfo->onlink) {
1791 struct rt6_info *rt;
1792 unsigned long rt_expires;
1793
6f704992
YH		 1794 /* Avoid arithmetic overflow. Really, we could
1795 * save rt_expires in seconds, likely valid_lft,
1796 * but it would require division in fib gc, that it
1797 * not good.
1798 */
4bed72e4
YH		 1799 if (HZ > USER_HZ)
1800 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1801 else
1802 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1803
4bed72e4
YH		 1804 if (addrconf_finite_timeout(rt_expires))
1805 rt_expires *= HZ;
1da177e4 1806
c346dca1 1807 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1808 dev->ifindex, 1);
1da177e4 1809
2b5ead46 1810 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1811 /* Autoconf prefix route */
1812 if (valid_lft == 0) {
1813 ip6_del_rt(rt);
1814 rt = NULL;
4bed72e4 1815 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1816 /* not infinity */
1817 rt->rt6i_expires = jiffies + rt_expires;
1818 rt->rt6i_flags |= RTF_EXPIRES;
1819 } else {
1820 rt->rt6i_flags &= ~RTF_EXPIRES;
1821 rt->rt6i_expires = 0;
1da177e4
LT		 1822 }
1823 } else if (valid_lft) {
6f704992 1824 clock_t expires = 0;
4bed72e4
YH		 1825 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1826 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1827 /* not infinity */
1828 flags |= RTF_EXPIRES;
1829 expires = jiffies_to_clock_t(rt_expires);
1830 }
1da177e4 1831 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1832 dev, expires, flags);
1da177e4
LT		 1833 }
1834 if (rt)
1835 dst_release(&rt->u.dst);
1836 }
1837
1838 /* Try to figure out our local address for this prefix */
1839
1840 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1841 struct inet6_ifaddr * ifp;
1842 struct in6_addr addr;
1843 int create = 0, update_lft = 0;
1844
1845 if (pinfo->prefix_len == 64) {
1846 memcpy(&addr, &pinfo->prefix, 8);
1847 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1848 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1849 in6_dev_put(in6_dev);
1850 return;
1851 }
1852 goto ok;
1853 }
1854 if (net_ratelimit())
1855 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1856 pinfo->prefix_len);
1857 in6_dev_put(in6_dev);
1858 return;
1859
1860ok:
1861
c346dca1 1862 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1da177e4
LT		 1863
1864 if (ifp == NULL && valid_lft) {
1865 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1866 u32 addr_flags = 0;
1867
1868#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1869 if (in6_dev->cnf.optimistic_dad &&
1870 !ipv6_devconf.forwarding)
1871 addr_flags = IFA_F_OPTIMISTIC;
1872#endif
1da177e4
LT		 1873
1874 /* Do not allow to create too much of autoconfigured
1875 * addresses; this would be too easy way to crash kernel.
1876 */
1877 if (!max_addresses ||
1878 ipv6_count_addresses(in6_dev) < max_addresses)
1879 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1880 addr_type&IPV6_ADDR_SCOPE_MASK,
1881 addr_flags);
1da177e4
LT		 1882
1883 if (!ifp || IS_ERR(ifp)) {
1884 in6_dev_put(in6_dev);
1885 return;
1886 }
1887
1888 update_lft = create = 1;
1889 ifp->cstamp = jiffies;
1890 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1891 }
1892
1893 if (ifp) {
1894 int flags;
1895 unsigned long now;
1896#ifdef CONFIG_IPV6_PRIVACY
1897 struct inet6_ifaddr *ift;
1898#endif
1899 u32 stored_lft;
1900
1901 /* update lifetime (RFC2462 5.5.3 e) */
1902 spin_lock(&ifp->lock);
1903 now = jiffies;
1904 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1905 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1906 else
1907 stored_lft = 0;
1908 if (!update_lft && stored_lft) {
1909 if (valid_lft > MIN_VALID_LIFETIME ||
1910 valid_lft > stored_lft)
1911 update_lft = 1;
1912 else if (stored_lft <= MIN_VALID_LIFETIME) {
1913 /* valid_lft <= stored_lft is always true */
1914 /* XXX: IPsec */
1915 update_lft = 0;
1916 } else {
1917 valid_lft = MIN_VALID_LIFETIME;
1918 if (valid_lft < prefered_lft)
1919 prefered_lft = valid_lft;
1920 update_lft = 1;
1921 }
1922 }
1923
1924 if (update_lft) {
1925 ifp->valid_lft = valid_lft;
1926 ifp->prefered_lft = prefered_lft;
1927 ifp->tstamp = now;
1928 flags = ifp->flags;
1929 ifp->flags &= ~IFA_F_DEPRECATED;
1930 spin_unlock(&ifp->lock);
1931
1932 if (!(flags&IFA_F_TENTATIVE))
1933 ipv6_ifa_notify(0, ifp);
1934 } else
1935 spin_unlock(&ifp->lock);
1936
1937#ifdef CONFIG_IPV6_PRIVACY
1938 read_lock_bh(&in6_dev->lock);
1939 /* update all temporary addresses in the list */
1940 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1941 /*
1942 * When adjusting the lifetimes of an existing
1943 * temporary address, only lower the lifetimes.
1944 * Implementations must not increase the
1945 * lifetimes of an existing temporary address
1946 * when processing a Prefix Information Option.
1947 */
c6fbfac2
BB		 1948 if (ifp != ift->ifpub)
1949 continue;
1950
1da177e4
LT		 1951 spin_lock(&ift->lock);
1952 flags = ift->flags;
1953 if (ift->valid_lft > valid_lft &&
1954 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1955 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1956 if (ift->prefered_lft > prefered_lft &&
1957 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1958 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1959 spin_unlock(&ift->lock);
1960 if (!(flags&IFA_F_TENTATIVE))
1961 ipv6_ifa_notify(0, ift);
1962 }
1963
1964 if (create && in6_dev->cnf.use_tempaddr > 0) {
1965 /*
1966 * When a new public address is created as described in [ADDRCONF],
1967 * also create a new temporary address.
1968 */
1ab1457c 1969 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1970 ipv6_create_tempaddr(ifp, NULL);
1971 } else {
1972 read_unlock_bh(&in6_dev->lock);
1973 }
1974#endif
1975 in6_ifa_put(ifp);
1976 addrconf_verify(0);
1977 }
1978 }
1979 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1980 in6_dev_put(in6_dev);
1981}
1982
1983/*
1984 * Set destination address.
1985 * Special case for SIT interfaces where we create a new "virtual"
1986 * device.
1987 */
af284937 1988int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 1989{
1990 struct in6_ifreq ireq;
1991 struct net_device *dev;
1992 int err = -EINVAL;
1993
1994 rtnl_lock();
1995
1996 err = -EFAULT;
1997 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1998 goto err_exit;
1999
af284937 2000 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2001
2002 err = -ENODEV;
2003 if (dev == NULL)
2004 goto err_exit;
2005
0be669bb 2006#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2007 if (dev->type == ARPHRD_SIT) {
2008 struct ifreq ifr;
2009 mm_segment_t oldfs;
2010 struct ip_tunnel_parm p;
2011
2012 err = -EADDRNOTAVAIL;
2013 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2014 goto err_exit;
2015
2016 memset(&p, 0, sizeof(p));
2017 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2018 p.iph.saddr = 0;
2019 p.iph.version = 4;
2020 p.iph.ihl = 5;
2021 p.iph.protocol = IPPROTO_IPV6;
2022 p.iph.ttl = 64;
d20b3109 2023 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 2024
2025 oldfs = get_fs(); set_fs(KERNEL_DS);
2026 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2027 set_fs(oldfs);
2028
2029 if (err == 0) {
2030 err = -ENOBUFS;
af284937
DL		 2031 dev = __dev_get_by_name(net, p.name);
2032 if (!dev)
1da177e4
LT		 2033 goto err_exit;
2034 err = dev_open(dev);
2035 }
2036 }
0be669bb 2037#endif
1da177e4
LT		 2038
2039err_exit:
2040 rtnl_unlock();
2041 return err;
2042}
2043
2044/*
2045 * Manual configuration of address on an interface
2046 */
af284937 2047static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2048 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2049 __u32 valid_lft)
1da177e4
LT		 2050{
2051 struct inet6_ifaddr *ifp;
2052 struct inet6_dev *idev;
2053 struct net_device *dev;
2054 int scope;
6f704992
YH		 2055 u32 flags;
2056 clock_t expires;
4bed72e4 2057 unsigned long timeout;
1da177e4
LT		 2058
2059 ASSERT_RTNL();
1ab1457c 2060
24ef0da7
TG		 2061 if (plen > 128)
2062 return -EINVAL;
2063
0778769d
NT		 2064 /* check the lifetime */
2065 if (!valid_lft || prefered_lft > valid_lft)
2066 return -EINVAL;
2067
af284937
DL		 2068 dev = __dev_get_by_index(net, ifindex);
2069 if (!dev)
1da177e4 2070 return -ENODEV;
1ab1457c 2071
1da177e4
LT		 2072 if ((idev = addrconf_add_dev(dev)) == NULL)
2073 return -ENOBUFS;
2074
2075 scope = ipv6_addr_scope(pfx);
2076
4bed72e4
YH		 2077 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2078 if (addrconf_finite_timeout(timeout)) {
2079 expires = jiffies_to_clock_t(timeout * HZ);
2080 valid_lft = timeout;
6f704992 2081 flags = RTF_EXPIRES;
4bed72e4
YH		 2082 } else {
2083 expires = 0;
2084 flags = 0;
2085 ifa_flags |= IFA_F_PERMANENT;
6f704992 2086 }
0778769d 2087
4bed72e4
YH		 2088 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2089 if (addrconf_finite_timeout(timeout)) {
2090 if (timeout == 0)
2091 ifa_flags |= IFA_F_DEPRECATED;
2092 prefered_lft = timeout;
2093 }
0778769d
NT		 2094
2095 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2096
1da177e4 2097 if (!IS_ERR(ifp)) {
06aebfb7 2098 spin_lock_bh(&ifp->lock);
0778769d
NT		 2099 ifp->valid_lft = valid_lft;
2100 ifp->prefered_lft = prefered_lft;
2101 ifp->tstamp = jiffies;
06aebfb7 2102 spin_unlock_bh(&ifp->lock);
0778769d 2103
46d48046 2104 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2105 expires, flags);
95c385b4
NH		 2106 /*
2107 * Note that section 3.1 of RFC 4429 indicates
2108 * that the Optimistic flag should not be set for
2109 * manually configured addresses
2110 */
1da177e4
LT		 2111 addrconf_dad_start(ifp, 0);
2112 in6_ifa_put(ifp);
0778769d 2113 addrconf_verify(0);
1da177e4
LT		 2114 return 0;
2115 }
2116
2117 return PTR_ERR(ifp);
2118}
2119
af284937 2120static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2121 unsigned int plen)
1da177e4
LT		 2122{
2123 struct inet6_ifaddr *ifp;
2124 struct inet6_dev *idev;
2125 struct net_device *dev;
1ab1457c 2126
24ef0da7
TG		 2127 if (plen > 128)
2128 return -EINVAL;
2129
af284937
DL		 2130 dev = __dev_get_by_index(net, ifindex);
2131 if (!dev)
1da177e4
LT		 2132 return -ENODEV;
2133
2134 if ((idev = __in6_dev_get(dev)) == NULL)
2135 return -ENXIO;
2136
2137 read_lock_bh(&idev->lock);
2138 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2139 if (ifp->prefix_len == plen &&
2140 ipv6_addr_equal(pfx, &ifp->addr)) {
2141 in6_ifa_hold(ifp);
2142 read_unlock_bh(&idev->lock);
1ab1457c 2143
1da177e4
LT		 2144 ipv6_del_addr(ifp);
2145
2146 /* If the last address is deleted administratively,
2147 disable IPv6 on this interface.
2148 */
2149 if (idev->addr_list == NULL)
2150 addrconf_ifdown(idev->dev, 1);
2151 return 0;
2152 }
2153 }
2154 read_unlock_bh(&idev->lock);
2155 return -EADDRNOTAVAIL;
2156}
2157
2158
af284937 2159int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2160{
2161 struct in6_ifreq ireq;
2162 int err;
1ab1457c 2163
1da177e4
LT		 2164 if (!capable(CAP_NET_ADMIN))
2165 return -EPERM;
1ab1457c 2166
1da177e4
LT		 2167 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2168 return -EFAULT;
2169
2170 rtnl_lock();
af284937
DL		 2171 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2172 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2173 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2174 rtnl_unlock();
2175 return err;
2176}
2177
af284937 2178int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2179{
2180 struct in6_ifreq ireq;
2181 int err;
1ab1457c 2182
1da177e4
LT		 2183 if (!capable(CAP_NET_ADMIN))
2184 return -EPERM;
2185
2186 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2187 return -EFAULT;
2188
2189 rtnl_lock();
af284937
DL		 2190 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2191 ireq.ifr6_prefixlen);
1da177e4
LT		 2192 rtnl_unlock();
2193 return err;
2194}
2195
0be669bb 2196#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2197static void sit_add_v4_addrs(struct inet6_dev *idev)
2198{
2199 struct inet6_ifaddr * ifp;
2200 struct in6_addr addr;
2201 struct net_device *dev;
c346dca1 2202 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2203 int scope;
2204
2205 ASSERT_RTNL();
2206
2207 memset(&addr, 0, sizeof(struct in6_addr));
2208 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2209
2210 if (idev->dev->flags&IFF_POINTOPOINT) {
2211 addr.s6_addr32[0] = htonl(0xfe800000);
2212 scope = IFA_LINK;
2213 } else {
2214 scope = IPV6_ADDR_COMPATv4;
2215 }
2216
2217 if (addr.s6_addr32[3]) {
2218 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2219 if (!IS_ERR(ifp)) {
2220 spin_lock_bh(&ifp->lock);
2221 ifp->flags &= ~IFA_F_TENTATIVE;
2222 spin_unlock_bh(&ifp->lock);
2223 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2224 in6_ifa_put(ifp);
2225 }
2226 return;
2227 }
2228
6fda7350 2229 for_each_netdev(net, dev) {
e5ed6399 2230 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2231 if (in_dev && (dev->flags & IFF_UP)) {
2232 struct in_ifaddr * ifa;
2233
2234 int flag = scope;
2235
2236 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2237 int plen;
2238
2239 addr.s6_addr32[3] = ifa->ifa_local;
2240
2241 if (ifa->ifa_scope == RT_SCOPE_LINK)
2242 continue;
2243 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2244 if (idev->dev->flags&IFF_POINTOPOINT)
2245 continue;
2246 flag |= IFA_HOST;
2247 }
2248 if (idev->dev->flags&IFF_POINTOPOINT)
2249 plen = 64;
2250 else
2251 plen = 96;
2252
2253 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2254 IFA_F_PERMANENT);
2255 if (!IS_ERR(ifp)) {
2256 spin_lock_bh(&ifp->lock);
2257 ifp->flags &= ~IFA_F_TENTATIVE;
2258 spin_unlock_bh(&ifp->lock);
2259 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2260 in6_ifa_put(ifp);
2261 }
2262 }
2263 }
1ab1457c 2264 }
1da177e4 2265}
0be669bb 2266#endif
1da177e4
LT		 2267
2268static void init_loopback(struct net_device *dev)
2269{
2270 struct inet6_dev *idev;
2271 struct inet6_ifaddr * ifp;
2272
2273 /* ::1 */
2274
2275 ASSERT_RTNL();
2276
2277 if ((idev = ipv6_find_idev(dev)) == NULL) {
2278 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2279 return;
2280 }
2281
2282 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2283 if (!IS_ERR(ifp)) {
2284 spin_lock_bh(&ifp->lock);
2285 ifp->flags &= ~IFA_F_TENTATIVE;
2286 spin_unlock_bh(&ifp->lock);
2287 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2288 in6_ifa_put(ifp);
2289 }
2290}
2291
2292static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2293{
2294 struct inet6_ifaddr * ifp;
95c385b4
NH		 2295 u32 addr_flags = IFA_F_PERMANENT;
2296
2297#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2298 if (idev->cnf.optimistic_dad &&
2299 !ipv6_devconf.forwarding)
2300 addr_flags |= IFA_F_OPTIMISTIC;
2301#endif
1da177e4 2302
95c385b4
NH		 2303
2304 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2305 if (!IS_ERR(ifp)) {
46d48046 2306 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2307 addrconf_dad_start(ifp, 0);
2308 in6_ifa_put(ifp);
2309 }
2310}
2311
2312static void addrconf_dev_config(struct net_device *dev)
2313{
2314 struct in6_addr addr;
2315 struct inet6_dev * idev;
2316
2317 ASSERT_RTNL();
2318
74235a25
HX		 2319 if ((dev->type != ARPHRD_ETHER) &&
2320 (dev->type != ARPHRD_FDDI) &&
2321 (dev->type != ARPHRD_IEEE802_TR) &&
2322 (dev->type != ARPHRD_ARCNET) &&
2323 (dev->type != ARPHRD_INFINIBAND)) {
2324 /* Alas, we support only Ethernet autoconfiguration. */
2325 return;
2326 }
2327
1da177e4
LT		 2328 idev = addrconf_add_dev(dev);
2329 if (idev == NULL)
2330 return;
2331
2332 memset(&addr, 0, sizeof(struct in6_addr));
2333 addr.s6_addr32[0] = htonl(0xFE800000);
2334
2335 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2336 addrconf_add_linklocal(idev, &addr);
2337}
2338
0be669bb 2339#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2340static void addrconf_sit_config(struct net_device *dev)
2341{
2342 struct inet6_dev *idev;
2343
2344 ASSERT_RTNL();
2345
1ab1457c
YH		 2346 /*
2347 * Configure the tunnel with one of our IPv4
2348 * addresses... we should configure all of
1da177e4
LT		 2349 * our v4 addrs in the tunnel
2350 */
2351
2352 if ((idev = ipv6_find_idev(dev)) == NULL) {
2353 printk(KERN_DEBUG "init sit: add_dev failed\n");
2354 return;
2355 }
2356
c7dc89c0
FT		 2357 if (dev->priv_flags & IFF_ISATAP) {
2358 struct in6_addr addr;
2359
2360 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2361 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2362 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2363 addrconf_add_linklocal(idev, &addr);
2364 return;
2365 }
2366
1da177e4
LT		 2367 sit_add_v4_addrs(idev);
2368
2369 if (dev->flags&IFF_POINTOPOINT) {
2370 addrconf_add_mroute(dev);
2371 addrconf_add_lroute(dev);
2372 } else
2373 sit_route_add(dev);
2374}
0be669bb 2375#endif
1da177e4
LT		 2376
2377static inline int
2378ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2379{
2380 struct in6_addr lladdr;
2381
95c385b4 2382 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2383 addrconf_add_linklocal(idev, &lladdr);
2384 return 0;
2385 }
2386 return -1;
2387}
2388
2389static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2390{
2391 struct net_device *link_dev;
c346dca1 2392 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2393
2394 /* first try to inherit the link-local address from the link device */
2395 if (idev->dev->iflink &&
6fda7350 2396 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2397 if (!ipv6_inherit_linklocal(idev, link_dev))
2398 return;
2399 }
2400 /* then try to inherit it from any device */
6fda7350 2401 for_each_netdev(net, link_dev) {
1da177e4
LT		 2402 if (!ipv6_inherit_linklocal(idev, link_dev))
2403 return;
2404 }
2405 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2406}
2407
2408/*
2409 * Autoconfigure tunnel with a link-local address so routing protocols,
2410 * DHCPv6, MLD etc. can be run over the virtual link
2411 */
2412
2413static void addrconf_ip6_tnl_config(struct net_device *dev)
2414{
2415 struct inet6_dev *idev;
2416
2417 ASSERT_RTNL();
2418
2419 if ((idev = addrconf_add_dev(dev)) == NULL) {
2420 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2421 return;
2422 }
2423 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2424}
2425
1ab1457c 2426static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2427 void * data)
2428{
2429 struct net_device *dev = (struct net_device *) data;
74235a25 2430 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2431 int run_pending = 0;
b217d616 2432 int err;
1da177e4
LT		 2433
2434 switch(event) {
45ba9dd2 2435 case NETDEV_REGISTER:
74235a25 2436 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2437 idev = ipv6_add_dev(dev);
2438 if (!idev)
b217d616 2439 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2440 }
2441 break;
1da177e4 2442 case NETDEV_UP:
3c21edbd 2443 case NETDEV_CHANGE:
c2edacf8
JV		 2444 if (dev->flags & IFF_SLAVE)
2445 break;
2446
3c21edbd 2447 if (event == NETDEV_UP) {
f24e3d65 2448 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2449 /* device is not ready yet. */
2450 printk(KERN_INFO
2451 "ADDRCONF(NETDEV_UP): %s: "
2452 "link is not ready\n",
2453 dev->name);
2454 break;
2455 }
99081049 2456
d31c7b8f
EP		 2457 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2458 idev = ipv6_add_dev(dev);
2459
99081049
KS		 2460 if (idev)
2461 idev->if_flags |= IF_READY;
3c21edbd 2462 } else {
f24e3d65 2463 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2464 /* device is still not ready. */
2465 break;
2466 }
2467
2468 if (idev) {
2469 if (idev->if_flags & IF_READY) {
2470 /* device is already configured. */
2471 break;
2472 }
2473 idev->if_flags |= IF_READY;
2474 }
2475
2476 printk(KERN_INFO
2477 "ADDRCONF(NETDEV_CHANGE): %s: "
2478 "link becomes ready\n",
2479 dev->name);
2480
c5e33bdd 2481 run_pending = 1;
3c21edbd
YH		 2482 }
2483
1da177e4 2484 switch(dev->type) {
0be669bb 2485#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2486 case ARPHRD_SIT:
2487 addrconf_sit_config(dev);
2488 break;
0be669bb 2489#endif
1da177e4
LT		 2490 case ARPHRD_TUNNEL6:
2491 addrconf_ip6_tnl_config(dev);
2492 break;
2493 case ARPHRD_LOOPBACK:
2494 init_loopback(dev);
2495 break;
2496
2497 default:
2498 addrconf_dev_config(dev);
2499 break;
3ff50b79 2500 }
1da177e4 2501 if (idev) {
c5e33bdd
YH		 2502 if (run_pending)
2503 addrconf_dad_run(idev);
2504
1da177e4
LT		 2505 /* If the MTU changed during the interface down, when the
2506 interface up, the changed MTU must be reflected in the
2507 idev as well as routers.
2508 */
2509 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2510 rt6_mtu_change(dev, dev->mtu);
2511 idev->cnf.mtu6 = dev->mtu;
2512 }
2513 idev->tstamp = jiffies;
2514 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2515 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2516 stop IPv6 on this interface.
2517 */
2518 if (dev->mtu < IPV6_MIN_MTU)
2519 addrconf_ifdown(dev, event != NETDEV_DOWN);
2520 }
2521 break;
2522
2523 case NETDEV_CHANGEMTU:
d31c7b8f 2524 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2525 rt6_mtu_change(dev, dev->mtu);
2526 idev->cnf.mtu6 = dev->mtu;
2527 break;
2528 }
2529
d31c7b8f
EP		 2530 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2531 idev = ipv6_add_dev(dev);
2532 if (idev)
2533 break;
2534 }
2535
1da177e4
LT		 2536 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2537
2538 case NETDEV_DOWN:
2539 case NETDEV_UNREGISTER:
2540 /*
2541 * Remove all addresses from this interface.
2542 */
2543 addrconf_ifdown(dev, event != NETDEV_DOWN);
2544 break;
3c21edbd 2545
1da177e4 2546 case NETDEV_CHANGENAME:
1da177e4 2547 if (idev) {
5632c515 2548 snmp6_unregister_dev(idev);
408c4768 2549 addrconf_sysctl_unregister(idev);
f52295a9 2550 addrconf_sysctl_register(idev);
b217d616
HX		 2551 err = snmp6_register_dev(idev);
2552 if (err)
2553 return notifier_from_errno(err);
5632c515 2554 }
1da177e4 2555 break;
3ff50b79 2556 }
1da177e4
LT		 2557
2558 return NOTIFY_OK;
2559}
2560
2561/*
2562 * addrconf module should be notified of a device going up
2563 */
2564static struct notifier_block ipv6_dev_notf = {
2565 .notifier_call = addrconf_notify,
2566 .priority = 0
2567};
2568
2569static int addrconf_ifdown(struct net_device *dev, int how)
2570{
2571 struct inet6_dev *idev;
2572 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2573 struct net *net = dev_net(dev);
1da177e4
LT		 2574 int i;
2575
2576 ASSERT_RTNL();
2577
eb867579 2578 if ((dev->flags & IFF_LOOPBACK) && how == 1)
1da177e4
LT		 2579 how = 0;
2580
f3db4851 2581 rt6_ifdown(net, dev);
1da177e4
LT		 2582 neigh_ifdown(&nd_tbl, dev);
2583
2584 idev = __in6_dev_get(dev);
2585 if (idev == NULL)
2586 return -ENODEV;
2587
2588 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2589 Do not dev_put!
1da177e4 2590 */
439e2385 2591 if (how) {
1da177e4 2592 idev->dead = 1;
8814c4b5
YH		 2593
2594 /* protected by rtnl_lock */
2595 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2596
2597 /* Step 1.5: remove snmp6 entry */
2598 snmp6_unregister_dev(idev);
2599
2600 }
2601
2602 /* Step 2: clear hash table */
2603 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2604 bifa = &inet6_addr_lst[i];
2605
2606 write_lock_bh(&addrconf_hash_lock);
2607 while ((ifa = *bifa) != NULL) {
2608 if (ifa->idev == idev) {
2609 *bifa = ifa->lst_next;
2610 ifa->lst_next = NULL;
2611 addrconf_del_timer(ifa);
2612 in6_ifa_put(ifa);
2613 continue;
2614 }
2615 bifa = &ifa->lst_next;
2616 }
2617 write_unlock_bh(&addrconf_hash_lock);
2618 }
2619
2620 write_lock_bh(&idev->lock);
2621
2622 /* Step 3: clear flags for stateless addrconf */
439e2385 2623 if (!how)
3c21edbd 2624 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2625
2626 /* Step 4: clear address list */
2627#ifdef CONFIG_IPV6_PRIVACY
439e2385 2628 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2629 in6_dev_put(idev);
2630
2631 /* clear tempaddr list */
2632 while ((ifa = idev->tempaddr_list) != NULL) {
2633 idev->tempaddr_list = ifa->tmp_next;
2634 ifa->tmp_next = NULL;
2635 ifa->dead = 1;
2636 write_unlock_bh(&idev->lock);
2637 spin_lock_bh(&ifa->lock);
2638
2639 if (ifa->ifpub) {
2640 in6_ifa_put(ifa->ifpub);
2641 ifa->ifpub = NULL;
2642 }
2643 spin_unlock_bh(&ifa->lock);
2644 in6_ifa_put(ifa);
2645 write_lock_bh(&idev->lock);
2646 }
2647#endif
2648 while ((ifa = idev->addr_list) != NULL) {
2649 idev->addr_list = ifa->if_next;
2650 ifa->if_next = NULL;
2651 ifa->dead = 1;
2652 addrconf_del_timer(ifa);
2653 write_unlock_bh(&idev->lock);
2654
2655 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2656 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2657 in6_ifa_put(ifa);
2658
2659 write_lock_bh(&idev->lock);
2660 }
2661 write_unlock_bh(&idev->lock);
2662
2663 /* Step 5: Discard multicast list */
2664
439e2385 2665 if (how)
1da177e4
LT		 2666 ipv6_mc_destroy_dev(idev);
2667 else
2668 ipv6_mc_down(idev);
2669
1da177e4 2670 idev->tstamp = jiffies;
1ab1457c 2671
1da177e4
LT		 2672 /* Shot the device (if unregistered) */
2673
439e2385 2674 if (how) {
408c4768 2675 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2676 neigh_parms_release(&nd_tbl, idev->nd_parms);
2677 neigh_ifdown(&nd_tbl, dev);
2678 in6_dev_put(idev);
2679 }
2680 return 0;
2681}
2682
2683static void addrconf_rs_timer(unsigned long data)
2684{
2685 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2686
2687 if (ifp->idev->cnf.forwarding)
2688 goto out;
2689
2690 if (ifp->idev->if_flags & IF_RA_RCVD) {
2691 /*
2692 * Announcement received after solicitation
2693 * was sent
2694 */
2695 goto out;
2696 }
2697
2698 spin_lock(&ifp->lock);
2699 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
1da177e4
LT		 2700 /* The wait after the last probe can be shorter */
2701 addrconf_mod_timer(ifp, AC_RS,
2702 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2703 ifp->idev->cnf.rtr_solicit_delay :
2704 ifp->idev->cnf.rtr_solicit_interval);
2705 spin_unlock(&ifp->lock);
2706
f3ee4010 2707 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2708 } else {
2709 spin_unlock(&ifp->lock);
2710 /*
2711 * Note: we do not support deprecated "all on-link"
2712 * assumption any longer.
2713 */
2714 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2715 ifp->idev->dev->name);
2716 }
2717
2718out:
2719 in6_ifa_put(ifp);
2720}
2721
2722/*
2723 * Duplicate Address Detection
2724 */
3c21edbd
YH		 2725static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2726{
2727 unsigned long rand_num;
2728 struct inet6_dev *idev = ifp->idev;
2729
95c385b4
NH		 2730 if (ifp->flags & IFA_F_OPTIMISTIC)
2731 rand_num = 0;
2732 else
2733 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2734
3c21edbd
YH		 2735 ifp->probes = idev->cnf.dad_transmits;
2736 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2737}
2738
e431b8c0 2739static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2740{
2741 struct inet6_dev *idev = ifp->idev;
2742 struct net_device *dev = idev->dev;
1da177e4
LT		 2743
2744 addrconf_join_solict(dev, &ifp->addr);
2745
1da177e4 2746 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2747
2748 read_lock_bh(&idev->lock);
2749 if (ifp->dead)
2750 goto out;
2751 spin_lock_bh(&ifp->lock);
2752
2753 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2754 !(ifp->flags&IFA_F_TENTATIVE) ||
2755 ifp->flags & IFA_F_NODAD) {
95c385b4 2756 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2757 spin_unlock_bh(&ifp->lock);
2758 read_unlock_bh(&idev->lock);
2759
2760 addrconf_dad_completed(ifp);
2761 return;
2762 }
2763
6732bade 2764 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2765 spin_unlock_bh(&ifp->lock);
6732bade 2766 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2767 /*
2768 * If the defice is not ready:
2769 * - keep it tentative if it is a permanent address.
2770 * - otherwise, kill it.
2771 */
2772 in6_ifa_hold(ifp);
2773 addrconf_dad_stop(ifp);
6732bade 2774 return;
3c21edbd 2775 }
95c385b4
NH		 2776
2777 /*
2778 * Optimistic nodes can start receiving
2779 * Frames right away
2780 */
2781 if(ifp->flags & IFA_F_OPTIMISTIC)
2782 ip6_ins_rt(ifp->rt);
2783
6732bade
YH		 2784 addrconf_dad_kick(ifp);
2785 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2786out:
2787 read_unlock_bh(&idev->lock);
2788}
2789
2790static void addrconf_dad_timer(unsigned long data)
2791{
2792 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2793 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2794 struct in6_addr mcaddr;
2795
2796 read_lock_bh(&idev->lock);
2797 if (idev->dead) {
2798 read_unlock_bh(&idev->lock);
2799 goto out;
2800 }
2801 spin_lock_bh(&ifp->lock);
2802 if (ifp->probes == 0) {
2803 /*
2804 * DAD was successful
2805 */
2806
95c385b4 2807 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2808 spin_unlock_bh(&ifp->lock);
2809 read_unlock_bh(&idev->lock);
2810
2811 addrconf_dad_completed(ifp);
2812
2813 goto out;
2814 }
2815
2816 ifp->probes--;
2817 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2818 spin_unlock_bh(&ifp->lock);
2819 read_unlock_bh(&idev->lock);
2820
2821 /* send a neighbour solicitation for our addr */
1da177e4 2822 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2823 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2824out:
2825 in6_ifa_put(ifp);
2826}
2827
2828static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2829{
2830 struct net_device * dev = ifp->idev->dev;
2831
2832 /*
2833 * Configure the address for reception. Now it is valid.
2834 */
2835
2836 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2837
2838 /* If added prefix is link local and forwarding is off,
2839 start sending router solicitations.
2840 */
2841
2842 if (ifp->idev->cnf.forwarding == 0 &&
2843 ifp->idev->cnf.rtr_solicits > 0 &&
2844 (dev->flags&IFF_LOOPBACK) == 0 &&
2845 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2846 /*
2847 * If a host as already performed a random delay
2848 * [...] as part of DAD [...] there is no need
2849 * to delay again before sending the first RS
2850 */
f3ee4010 2851 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2852
2853 spin_lock_bh(&ifp->lock);
2854 ifp->probes = 1;
2855 ifp->idev->if_flags |= IF_RS_SENT;
2856 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2857 spin_unlock_bh(&ifp->lock);
2858 }
2859}
2860
c5e33bdd
YH		 2861static void addrconf_dad_run(struct inet6_dev *idev) {
2862 struct inet6_ifaddr *ifp;
2863
2864 read_lock_bh(&idev->lock);
2865 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2866 spin_lock_bh(&ifp->lock);
2867 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2868 spin_unlock_bh(&ifp->lock);
2869 continue;
2870 }
2871 spin_unlock_bh(&ifp->lock);
2872 addrconf_dad_kick(ifp);
2873 }
2874 read_unlock_bh(&idev->lock);
2875}
2876
1da177e4
LT		 2877#ifdef CONFIG_PROC_FS
2878struct if6_iter_state {
3c40090a 2879 struct seq_net_private p;
1da177e4
LT		 2880 int bucket;
2881};
2882
2883static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2884{
2885 struct inet6_ifaddr *ifa = NULL;
2886 struct if6_iter_state *state = seq->private;
1218854a 2887 struct net *net = seq_file_net(seq);
1da177e4
LT		 2888
2889 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2890 ifa = inet6_addr_lst[state->bucket];
3c40090a 2891
878628fb 2892 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2893 ifa = ifa->lst_next;
1da177e4
LT		 2894 if (ifa)
2895 break;
2896 }
2897 return ifa;
2898}
2899
2900static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2901{
2902 struct if6_iter_state *state = seq->private;
1218854a 2903 struct net *net = seq_file_net(seq);
1da177e4
LT		 2904
2905 ifa = ifa->lst_next;
2906try_again:
3c40090a 2907 if (ifa) {
878628fb 2908 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2909 ifa = ifa->lst_next;
2910 goto try_again;
2911 }
2912 }
2913
1da177e4
LT		 2914 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2915 ifa = inet6_addr_lst[state->bucket];
2916 goto try_again;
2917 }
3c40090a 2918
1da177e4
LT		 2919 return ifa;
2920}
2921
2922static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2923{
2924 struct inet6_ifaddr *ifa = if6_get_first(seq);
2925
2926 if (ifa)
2927 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2928 --pos;
2929 return pos ? NULL : ifa;
2930}
2931
2932static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2933 __acquires(addrconf_hash_lock)
1da177e4
LT		 2934{
2935 read_lock_bh(&addrconf_hash_lock);
2936 return if6_get_idx(seq, *pos);
2937}
2938
2939static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2940{
2941 struct inet6_ifaddr *ifa;
2942
2943 ifa = if6_get_next(seq, v);
2944 ++*pos;
2945 return ifa;
2946}
2947
2948static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2949 __releases(addrconf_hash_lock)
1da177e4
LT		 2950{
2951 read_unlock_bh(&addrconf_hash_lock);
2952}
2953
2954static int if6_seq_show(struct seq_file *seq, void *v)
2955{
2956 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2957 seq_printf(seq,
9343e79a 2958 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2959 NIP6(ifp->addr),
2960 ifp->idev->dev->ifindex,
2961 ifp->prefix_len,
2962 ifp->scope,
2963 ifp->flags,
2964 ifp->idev->dev->name);
2965 return 0;
2966}
2967
56b3d975 2968static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2969 .start = if6_seq_start,
2970 .next = if6_seq_next,
2971 .show = if6_seq_show,
2972 .stop = if6_seq_stop,
2973};
2974
2975static int if6_seq_open(struct inode *inode, struct file *file)
2976{
3c40090a
DL		 2977 return seq_open_net(inode, file, &if6_seq_ops,
2978 sizeof(struct if6_iter_state));
1da177e4
LT		 2979}
2980
9a32144e 2981static const struct file_operations if6_fops = {
1da177e4
LT		 2982 .owner = THIS_MODULE,
2983 .open = if6_seq_open,
2984 .read = seq_read,
2985 .llseek = seq_lseek,
3c40090a 2986 .release = seq_release_net,
1da177e4
LT		 2987};
2988
3c40090a 2989static int if6_proc_net_init(struct net *net)
1da177e4 2990{
3c40090a 2991 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2992 return -ENOMEM;
2993 return 0;
2994}
2995
3c40090a
DL		 2996static void if6_proc_net_exit(struct net *net)
2997{
2998 proc_net_remove(net, "if_inet6");
2999}
3000
3001static struct pernet_operations if6_proc_net_ops = {
3002 .init = if6_proc_net_init,
3003 .exit = if6_proc_net_exit,
3004};
3005
3006int __init if6_proc_init(void)
3007{
3008 return register_pernet_subsys(&if6_proc_net_ops);
3009}
3010
1da177e4
LT		 3011void if6_proc_exit(void)
3012{
3c40090a 3013 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3014}
3015#endif /* CONFIG_PROC_FS */
3016
59fbb3a6 3017#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3018/* Check if address is a home address configured on any interface. */
389f6612 3019int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3020{
3021 int ret = 0;
3022 struct inet6_ifaddr * ifp;
3023 u8 hash = ipv6_addr_hash(addr);
3024 read_lock_bh(&addrconf_hash_lock);
3025 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3026 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3027 continue;
caad295f 3028 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3029 (ifp->flags & IFA_F_HOMEADDRESS)) {
3030 ret = 1;
3031 break;
3032 }
3033 }
3034 read_unlock_bh(&addrconf_hash_lock);
3035 return ret;
3036}
3037#endif
3038
1da177e4
LT		 3039/*
3040 * Periodic address status verification
3041 */
3042
3043static void addrconf_verify(unsigned long foo)
3044{
3045 struct inet6_ifaddr *ifp;
3046 unsigned long now, next;
3047 int i;
3048
3049 spin_lock_bh(&addrconf_verify_lock);
3050 now = jiffies;
3051 next = now + ADDR_CHECK_FREQUENCY;
3052
3053 del_timer(&addr_chk_timer);
3054
3055 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3056
3057restart:
5d5780df 3058 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3059 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3060 unsigned long age;
3061#ifdef CONFIG_IPV6_PRIVACY
3062 unsigned long regen_advance;
3063#endif
3064
3065 if (ifp->flags & IFA_F_PERMANENT)
3066 continue;
3067
3068 spin_lock(&ifp->lock);
3069 age = (now - ifp->tstamp) / HZ;
3070
3071#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3072 regen_advance = ifp->idev->cnf.regen_max_retry *
3073 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3074 ifp->idev->nd_parms->retrans_time / HZ;
3075#endif
3076
8f27ebb9
YH		 3077 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3078 age >= ifp->valid_lft) {
1da177e4
LT		 3079 spin_unlock(&ifp->lock);
3080 in6_ifa_hold(ifp);
5d5780df 3081 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3082 ipv6_del_addr(ifp);
3083 goto restart;
8f27ebb9
YH		 3084 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3085 spin_unlock(&ifp->lock);
3086 continue;
1da177e4
LT		 3087 } else if (age >= ifp->prefered_lft) {
3088 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3089 int deprecate = 0;
3090
3091 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3092 deprecate = 1;
3093 ifp->flags |= IFA_F_DEPRECATED;
3094 }
3095
3096 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3097 next = ifp->tstamp + ifp->valid_lft * HZ;
3098
3099 spin_unlock(&ifp->lock);
3100
3101 if (deprecate) {
3102 in6_ifa_hold(ifp);
5d5780df 3103 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3104
3105 ipv6_ifa_notify(0, ifp);
3106 in6_ifa_put(ifp);
3107 goto restart;
3108 }
3109#ifdef CONFIG_IPV6_PRIVACY
3110 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3111 !(ifp->flags&IFA_F_TENTATIVE)) {
3112 if (age >= ifp->prefered_lft - regen_advance) {
3113 struct inet6_ifaddr *ifpub = ifp->ifpub;
3114 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3115 next = ifp->tstamp + ifp->prefered_lft * HZ;
3116 if (!ifp->regen_count && ifpub) {
3117 ifp->regen_count++;
3118 in6_ifa_hold(ifp);
3119 in6_ifa_hold(ifpub);
3120 spin_unlock(&ifp->lock);
5d5780df 3121 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3122 spin_lock(&ifpub->lock);
3123 ifpub->regen_count = 0;
3124 spin_unlock(&ifpub->lock);
1da177e4
LT		 3125 ipv6_create_tempaddr(ifpub, ifp);
3126 in6_ifa_put(ifpub);
3127 in6_ifa_put(ifp);
3128 goto restart;
3129 }
3130 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3131 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3132 spin_unlock(&ifp->lock);
3133#endif
3134 } else {
3135 /* ifp->prefered_lft <= ifp->valid_lft */
3136 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3137 next = ifp->tstamp + ifp->prefered_lft * HZ;
3138 spin_unlock(&ifp->lock);
3139 }
3140 }
5d5780df 3141 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3142 }
3143
3144 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3145 add_timer(&addr_chk_timer);
3146 spin_unlock_bh(&addrconf_verify_lock);
3147}
3148
461d8837
TG		 3149static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3150{
3151 struct in6_addr *pfx = NULL;
3152
3153 if (addr)
3154 pfx = nla_data(addr);
3155
3156 if (local) {
3157 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3158 pfx = NULL;
3159 else
3160 pfx = nla_data(local);
3161 }
3162
3163 return pfx;
3164}
3165
ef7c79ed 3166static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3167 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3168 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3169 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3170};
3171
1da177e4
LT		 3172static int
3173inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3174{
3b1e0a65 3175 struct net *net = sock_net(skb->sk);
b933f716
TG		 3176 struct ifaddrmsg *ifm;
3177 struct nlattr *tb[IFA_MAX+1];
1da177e4 3178 struct in6_addr *pfx;
b933f716 3179 int err;
1da177e4 3180
b933f716
TG		 3181 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3182 if (err < 0)
3183 return err;
3184
3185 ifm = nlmsg_data(nlh);
3186 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3187 if (pfx == NULL)
3188 return -EINVAL;
3189
af284937 3190 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3191}
3192
55ebaef1
NT		 3193static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3194 u32 prefered_lft, u32 valid_lft)
081bba5b 3195{
6f704992
YH		 3196 u32 flags;
3197 clock_t expires;
4bed72e4 3198 unsigned long timeout;
46d48046 3199
081bba5b
NT		 3200 if (!valid_lft || (prefered_lft > valid_lft))
3201 return -EINVAL;
3202
4bed72e4
YH		 3203 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3204 if (addrconf_finite_timeout(timeout)) {
3205 expires = jiffies_to_clock_t(timeout * HZ);
3206 valid_lft = timeout;
6f704992 3207 flags = RTF_EXPIRES;
4bed72e4
YH		 3208 } else {
3209 expires = 0;
3210 flags = 0;
3211 ifa_flags |= IFA_F_PERMANENT;
6f704992 3212 }
081bba5b 3213
4bed72e4
YH		 3214 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3215 if (addrconf_finite_timeout(timeout)) {
3216 if (timeout == 0)
3217 ifa_flags |= IFA_F_DEPRECATED;
3218 prefered_lft = timeout;
3219 }
081bba5b
NT		 3220
3221 spin_lock_bh(&ifp->lock);
3b9f9a1c 3222 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3223 ifp->tstamp = jiffies;
3224 ifp->valid_lft = valid_lft;
3225 ifp->prefered_lft = prefered_lft;
3226
3227 spin_unlock_bh(&ifp->lock);
3228 if (!(ifp->flags&IFA_F_TENTATIVE))
3229 ipv6_ifa_notify(0, ifp);
081bba5b 3230
46d48046 3231 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3232 expires, flags);
081bba5b
NT		 3233 addrconf_verify(0);
3234
3235 return 0;
3236}
3237
1da177e4
LT		 3238static int
3239inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3240{
3b1e0a65 3241 struct net *net = sock_net(skb->sk);
461d8837
TG		 3242 struct ifaddrmsg *ifm;
3243 struct nlattr *tb[IFA_MAX+1];
1da177e4 3244 struct in6_addr *pfx;
7198f8ce
TG		 3245 struct inet6_ifaddr *ifa;
3246 struct net_device *dev;
55ebaef1
NT		 3247 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3248 u8 ifa_flags;
461d8837 3249 int err;
1da177e4 3250
461d8837
TG		 3251 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3252 if (err < 0)
3253 return err;
3254
3255 ifm = nlmsg_data(nlh);
3256 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3257 if (pfx == NULL)
3258 return -EINVAL;
3259
461d8837 3260 if (tb[IFA_CACHEINFO]) {
0778769d 3261 struct ifa_cacheinfo *ci;
461d8837
TG		 3262
3263 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3264 valid_lft = ci->ifa_valid;
461d8837
TG		 3265 preferred_lft = ci->ifa_prefered;
3266 } else {
3267 preferred_lft = INFINITY_LIFE_TIME;
3268 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3269 }
3270
af284937 3271 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3272 if (dev == NULL)
3273 return -ENODEV;
3274
55ebaef1 3275 /* We ignore other flags so far. */
3b9f9a1c 3276 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3277
1cab3da6 3278 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3279 if (ifa == NULL) {
3280 /*
3281 * It would be best to check for !NLM_F_CREATE here but
3282 * userspace alreay relies on not having to provide this.
3283 */
af284937
DL		 3284 return inet6_addr_add(net, ifm->ifa_index, pfx,
3285 ifm->ifa_prefixlen, ifa_flags,
3286 preferred_lft, valid_lft);
081bba5b
NT		 3287 }
3288
7198f8ce
TG		 3289 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3290 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3291 err = -EEXIST;
3292 else
55ebaef1 3293 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3294
3295 in6_ifa_put(ifa);
3296
3297 return err;
1da177e4
LT		 3298}
3299
101bb229
TG		 3300static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3301 u8 scope, int ifindex)
3302{
3303 struct ifaddrmsg *ifm;
3304
3305 ifm = nlmsg_data(nlh);
3306 ifm->ifa_family = AF_INET6;
3307 ifm->ifa_prefixlen = prefixlen;
3308 ifm->ifa_flags = flags;
3309 ifm->ifa_scope = scope;
3310 ifm->ifa_index = ifindex;
3311}
3312
85486af0
TG		 3313static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3314 unsigned long tstamp, u32 preferred, u32 valid)
3315{
3316 struct ifa_cacheinfo ci;
3317
3318 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3319 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3320 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3321 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3322 ci.ifa_prefered = preferred;
3323 ci.ifa_valid = valid;
3324
3325 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3326}
3327
101bb229
TG		 3328static inline int rt_scope(int ifa_scope)
3329{
3330 if (ifa_scope & IFA_HOST)
3331 return RT_SCOPE_HOST;
3332 else if (ifa_scope & IFA_LINK)
3333 return RT_SCOPE_LINK;
3334 else if (ifa_scope & IFA_SITE)
3335 return RT_SCOPE_SITE;
3336 else
3337 return RT_SCOPE_UNIVERSE;
3338}
3339
0ab6803b
TG		 3340static inline int inet6_ifaddr_msgsize(void)
3341{
339bf98f
TG		 3342 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3343 + nla_total_size(16) /* IFA_ADDRESS */
3344 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3345}
c5396a31 3346
1da177e4 3347static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3348 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3349{
1da177e4 3350 struct nlmsghdr *nlh;
85486af0 3351 u32 preferred, valid;
1da177e4 3352
0ab6803b
TG		 3353 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3354 if (nlh == NULL)
26932566 3355 return -EMSGSIZE;
0ab6803b 3356
101bb229
TG		 3357 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3358 ifa->idev->dev->ifindex);
3359
1da177e4 3360 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3361 preferred = ifa->prefered_lft;
3362 valid = ifa->valid_lft;
3363 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3364 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3365 preferred -= tval;
3366 if (valid != INFINITY_LIFE_TIME)
3367 valid -= tval;
1da177e4
LT		 3368 }
3369 } else {
85486af0
TG		 3370 preferred = INFINITY_LIFE_TIME;
3371 valid = INFINITY_LIFE_TIME;
3372 }
3373
0ab6803b 3374 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3375 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3376 nlmsg_cancel(skb, nlh);
3377 return -EMSGSIZE;
3378 }
1da177e4 3379
0ab6803b 3380 return nlmsg_end(skb, nlh);
1da177e4
LT		 3381}
3382
3383static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3384 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3385{
1da177e4 3386 struct nlmsghdr *nlh;
101bb229
TG		 3387 u8 scope = RT_SCOPE_UNIVERSE;
3388 int ifindex = ifmca->idev->dev->ifindex;
3389
3390 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3391 scope = RT_SCOPE_SITE;
1da177e4 3392
0ab6803b
TG		 3393 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3394 if (nlh == NULL)
26932566 3395 return -EMSGSIZE;
85486af0 3396
0ab6803b
TG		 3397 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3398 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3399 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3400 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3401 nlmsg_cancel(skb, nlh);
3402 return -EMSGSIZE;
3403 }
85486af0 3404
0ab6803b 3405 return nlmsg_end(skb, nlh);
1da177e4
LT		 3406}
3407
3408static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3409 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3410{
1da177e4 3411 struct nlmsghdr *nlh;
101bb229
TG		 3412 u8 scope = RT_SCOPE_UNIVERSE;
3413 int ifindex = ifaca->aca_idev->dev->ifindex;
3414
3415 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3416 scope = RT_SCOPE_SITE;
1da177e4 3417
0ab6803b
TG		 3418 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3419 if (nlh == NULL)
26932566 3420 return -EMSGSIZE;
85486af0 3421
0ab6803b
TG		 3422 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3423 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3424 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3425 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3426 nlmsg_cancel(skb, nlh);
3427 return -EMSGSIZE;
3428 }
1da177e4 3429
0ab6803b 3430 return nlmsg_end(skb, nlh);
1da177e4
LT		 3431}
3432
3433enum addr_type_t
3434{
3435 UNICAST_ADDR,
3436 MULTICAST_ADDR,
3437 ANYCAST_ADDR,
3438};
3439
3440static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3441 enum addr_type_t type)
3442{
3443 int idx, ip_idx;
3444 int s_idx, s_ip_idx;
3445 int err = 1;
3446 struct net_device *dev;
3447 struct inet6_dev *idev = NULL;
3448 struct inet6_ifaddr *ifa;
3449 struct ifmcaddr6 *ifmca;
3450 struct ifacaddr6 *ifaca;
3b1e0a65 3451 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3452
3453 s_idx = cb->args[0];
3454 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3455
7562f876 3456 idx = 0;
6fda7350 3457 for_each_netdev(net, dev) {
1da177e4 3458 if (idx < s_idx)
7562f876 3459 goto cont;
1da177e4
LT		 3460 if (idx > s_idx)
3461 s_ip_idx = 0;
3462 ip_idx = 0;
3463 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3464 goto cont;
1da177e4
LT		 3465 read_lock_bh(&idev->lock);
3466 switch (type) {
3467 case UNICAST_ADDR:
ae9cda5d 3468 /* unicast address incl. temp addr */
1da177e4
LT		 3469 for (ifa = idev->addr_list; ifa;
3470 ifa = ifa->if_next, ip_idx++) {
3471 if (ip_idx < s_ip_idx)
3472 continue;
5d5619b4
YH		 3473 err = inet6_fill_ifaddr(skb, ifa,
3474 NETLINK_CB(cb->skb).pid,
3475 cb->nlh->nlmsg_seq,
3476 RTM_NEWADDR,
3477 NLM_F_MULTI);
1da177e4 3478 }
1da177e4
LT		 3479 break;
3480 case MULTICAST_ADDR:
3481 /* multicast address */
1ab1457c 3482 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3483 ifmca = ifmca->next, ip_idx++) {
3484 if (ip_idx < s_ip_idx)
3485 continue;
5d5619b4
YH		 3486 err = inet6_fill_ifmcaddr(skb, ifmca,
3487 NETLINK_CB(cb->skb).pid,
3488 cb->nlh->nlmsg_seq,
3489 RTM_GETMULTICAST,
3490 NLM_F_MULTI);
1da177e4
LT		 3491 }
3492 break;
3493 case ANYCAST_ADDR:
3494 /* anycast address */
3495 for (ifaca = idev->ac_list; ifaca;
3496 ifaca = ifaca->aca_next, ip_idx++) {
3497 if (ip_idx < s_ip_idx)
3498 continue;
5d5619b4
YH		 3499 err = inet6_fill_ifacaddr(skb, ifaca,
3500 NETLINK_CB(cb->skb).pid,
3501 cb->nlh->nlmsg_seq,
3502 RTM_GETANYCAST,
3503 NLM_F_MULTI);
1da177e4
LT		 3504 }
3505 break;
3506 default:
3507 break;
3508 }
3509 read_unlock_bh(&idev->lock);
3510 in6_dev_put(idev);
5d5619b4
YH		 3511
3512 if (err <= 0)
3513 break;
7562f876
PE		 3514cont:
3515 idx++;
1da177e4 3516 }
1da177e4
LT		 3517 cb->args[0] = idx;
3518 cb->args[1] = ip_idx;
3519 return skb->len;
3520}
3521
3522static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3523{
3524 enum addr_type_t type = UNICAST_ADDR;
b854272b 3525
1da177e4
LT		 3526 return inet6_dump_addr(skb, cb, type);
3527}
3528
3529static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3530{
3531 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3532
1da177e4
LT		 3533 return inet6_dump_addr(skb, cb, type);
3534}
3535
3536
3537static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3538{
3539 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3540
1da177e4
LT		 3541 return inet6_dump_addr(skb, cb, type);
3542}
3543
1b29fc2c
TG		 3544static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3545 void *arg)
6c223828 3546{
3b1e0a65 3547 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3548 struct ifaddrmsg *ifm;
3549 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3550 struct in6_addr *addr = NULL;
3551 struct net_device *dev = NULL;
3552 struct inet6_ifaddr *ifa;
3553 struct sk_buff *skb;
6c223828
NT		 3554 int err;
3555
1b29fc2c
TG		 3556 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3557 if (err < 0)
3558 goto errout;
3559
3560 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3561 if (addr == NULL) {
3562 err = -EINVAL;
3563 goto errout;
6c223828 3564 }
6c223828 3565
1b29fc2c 3566 ifm = nlmsg_data(nlh);
6c223828 3567 if (ifm->ifa_index)
6fda7350 3568 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3569
1cab3da6 3570 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3571 err = -EADDRNOTAVAIL;
3572 goto errout;
3573 }
6c223828 3574
0ab6803b 3575 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3576 err = -ENOBUFS;
1b29fc2c 3577 goto errout_ifa;
6c223828
NT		 3578 }
3579
6c223828
NT		 3580 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3581 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3582 if (err < 0) {
3583 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3584 WARN_ON(err == -EMSGSIZE);
3585 kfree_skb(skb);
3586 goto errout_ifa;
3587 }
6fda7350 3588 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3589errout_ifa:
6c223828 3590 in6_ifa_put(ifa);
1b29fc2c 3591errout:
6c223828 3592 return err;
6c223828
NT		 3593}
3594
1da177e4
LT		 3595static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3596{
3597 struct sk_buff *skb;
c346dca1 3598 struct net *net = dev_net(ifa->idev->dev);
5d620266 3599 int err = -ENOBUFS;
1da177e4 3600
0ab6803b 3601 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3602 if (skb == NULL)
3603 goto errout;
3604
3605 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3606 if (err < 0) {
3607 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3608 WARN_ON(err == -EMSGSIZE);
3609 kfree_skb(skb);
3610 goto errout;
3611 }
6fda7350 3612 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3613errout:
3614 if (err < 0)
6fda7350 3615 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3616}
3617
b6f99a21 3618static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3619 __s32 *array, int bytes)
3620{
04561c1f
TG		 3621 BUG_ON(bytes < (DEVCONF_MAX * 4));
3622
1da177e4
LT		 3623 memset(array, 0, bytes);
3624 array[DEVCONF_FORWARDING] = cnf->forwarding;
3625 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3626 array[DEVCONF_MTU6] = cnf->mtu6;
3627 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3628 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3629 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3630 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3631 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3632 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3633 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3634 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3635#ifdef CONFIG_IPV6_PRIVACY
3636 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3637 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3638 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3639 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3640 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3641#endif
3642 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3643 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3644 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3645#ifdef CONFIG_IPV6_ROUTER_PREF
3646 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3647 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3648#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3649 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3650#endif
930d6ff2 3651#endif
fbea49e1 3652 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3653 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3654#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3655 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3656#endif
7bc570c8
YH		 3657#ifdef CONFIG_IPV6_MROUTE
3658 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3659#endif
1da177e4
LT		 3660}
3661
339bf98f
TG		 3662static inline size_t inet6_if_nlmsg_size(void)
3663{
3664 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3665 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3666 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3667 + nla_total_size(4) /* IFLA_MTU */
3668 + nla_total_size(4) /* IFLA_LINK */
3669 + nla_total_size( /* IFLA_PROTINFO */
3670 nla_total_size(4) /* IFLA_INET6_FLAGS */
3671 + nla_total_size(sizeof(struct ifla_cacheinfo))
3672 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3673 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3674 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3675 );
3676}
c5396a31 3677
7f7d9a6b
HX		 3678static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3679 int bytes)
3680{
3681 int i;
3682 int pad = bytes - sizeof(u64) * items;
3683 BUG_ON(pad < 0);
3684
3685 /* Use put_unaligned() because stats may not be aligned for u64. */
3686 put_unaligned(items, &stats[0]);
3687 for (i = 1; i < items; i++)
3688 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3689
3690 memset(&stats[items], 0, pad);
3691}
3692
3693static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3694 int bytes)
3695{
3696 switch(attrtype) {
3697 case IFLA_INET6_STATS:
3698 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3699 break;
3700 case IFLA_INET6_ICMP6STATS:
3701 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3702 break;
3703 }
3704}
3705
1ab1457c 3706static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3707 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3708{
04561c1f 3709 struct net_device *dev = idev->dev;
bf99f1bd 3710 struct nlattr *nla;
04561c1f
TG		 3711 struct ifinfomsg *hdr;
3712 struct nlmsghdr *nlh;
3713 void *protoinfo;
3714 struct ifla_cacheinfo ci;
3715
3716 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3717 if (nlh == NULL)
26932566 3718 return -EMSGSIZE;
04561c1f
TG		 3719
3720 hdr = nlmsg_data(nlh);
3721 hdr->ifi_family = AF_INET6;
3722 hdr->__ifi_pad = 0;
3723 hdr->ifi_type = dev->type;
3724 hdr->ifi_index = dev->ifindex;
3725 hdr->ifi_flags = dev_get_flags(dev);
3726 hdr->ifi_change = 0;
3727
3728 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3729
3730 if (dev->addr_len)
04561c1f 3731 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3732
04561c1f 3733 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3734 if (dev->ifindex != dev->iflink)
04561c1f 3735 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3736
04561c1f
TG		 3737 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3738 if (protoinfo == NULL)
3739 goto nla_put_failure;
1da177e4 3740
04561c1f 3741 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3742
1da177e4
LT		 3743 ci.max_reasm_len = IPV6_MAXPLEN;
3744 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3745 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3746 ci.reachable_time = idev->nd_parms->reachable_time;
3747 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3748 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3749
bf99f1bd
YH		 3750 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3751 if (nla == NULL)
04561c1f 3752 goto nla_put_failure;
bf99f1bd 3753 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3754
bf99f1bd
YH		 3755 /* XXX - MC not implemented */
3756
3757 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3758 if (nla == NULL)
3759 goto nla_put_failure;
3760 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3761
3762 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3763 if (nla == NULL)
3764 goto nla_put_failure;
3765 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3766
04561c1f
TG		 3767 nla_nest_end(skb, protoinfo);
3768 return nlmsg_end(skb, nlh);
1da177e4 3769
04561c1f 3770nla_put_failure:
26932566
PM		 3771 nlmsg_cancel(skb, nlh);
3772 return -EMSGSIZE;
1da177e4
LT		 3773}
3774
3775static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3776{
3b1e0a65 3777 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3778 int idx, err;
3779 int s_idx = cb->args[0];
3780 struct net_device *dev;
3781 struct inet6_dev *idev;
3782
3783 read_lock(&dev_base_lock);
7562f876 3784 idx = 0;
6fda7350 3785 for_each_netdev(net, dev) {
1da177e4 3786 if (idx < s_idx)
7562f876 3787 goto cont;
1da177e4 3788 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3789 goto cont;
1ab1457c 3790 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3791 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3792 in6_dev_put(idev);
3793 if (err <= 0)
3794 break;
7562f876
PE		 3795cont:
3796 idx++;
1da177e4
LT		 3797 }
3798 read_unlock(&dev_base_lock);
3799 cb->args[0] = idx;
3800
3801 return skb->len;
3802}
3803
3804void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3805{
3806 struct sk_buff *skb;
c346dca1 3807 struct net *net = dev_net(idev->dev);
8d7a76c9 3808 int err = -ENOBUFS;
1ab1457c 3809
339bf98f 3810 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3811 if (skb == NULL)
3812 goto errout;
3813
3814 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3815 if (err < 0) {
3816 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3817 WARN_ON(err == -EMSGSIZE);
3818 kfree_skb(skb);
3819 goto errout;
3820 }
6fda7350 3821 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3822errout:
3823 if (err < 0)
6fda7350 3824 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3825}
3826
339bf98f
TG		 3827static inline size_t inet6_prefix_nlmsg_size(void)
3828{
3829 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3830 + nla_total_size(sizeof(struct in6_addr))
3831 + nla_total_size(sizeof(struct prefix_cacheinfo));
3832}
c5396a31 3833
1da177e4 3834static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3835 struct prefix_info *pinfo, u32 pid, u32 seq,
3836 int event, unsigned int flags)
1da177e4 3837{
6051e2f4
TG		 3838 struct prefixmsg *pmsg;
3839 struct nlmsghdr *nlh;
1da177e4
LT		 3840 struct prefix_cacheinfo ci;
3841
6051e2f4
TG		 3842 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3843 if (nlh == NULL)
26932566 3844 return -EMSGSIZE;
6051e2f4
TG		 3845
3846 pmsg = nlmsg_data(nlh);
1da177e4 3847 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3848 pmsg->prefix_pad1 = 0;
3849 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3850 pmsg->prefix_ifindex = idev->dev->ifindex;
3851 pmsg->prefix_len = pinfo->prefix_len;
3852 pmsg->prefix_type = pinfo->type;
8a47077a 3853 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3854 pmsg->prefix_flags = 0;
3855 if (pinfo->onlink)
3856 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3857 if (pinfo->autoconf)
3858 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3859
6051e2f4 3860 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3861
3862 ci.preferred_time = ntohl(pinfo->prefered);
3863 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3864 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3865
6051e2f4 3866 return nlmsg_end(skb, nlh);
1da177e4 3867
6051e2f4 3868nla_put_failure:
26932566
PM		 3869 nlmsg_cancel(skb, nlh);
3870 return -EMSGSIZE;
1da177e4
LT		 3871}
3872
1ab1457c 3873static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3874 struct prefix_info *pinfo)
3875{
3876 struct sk_buff *skb;
c346dca1 3877 struct net *net = dev_net(idev->dev);
8c384bfa 3878 int err = -ENOBUFS;
1da177e4 3879
339bf98f 3880 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3881 if (skb == NULL)
3882 goto errout;
3883
3884 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3885 if (err < 0) {
3886 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3887 WARN_ON(err == -EMSGSIZE);
3888 kfree_skb(skb);
3889 goto errout;
3890 }
6fda7350 3891 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3892errout:
3893 if (err < 0)
6fda7350 3894 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3895}
3896
1da177e4
LT		 3897static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3898{
3899 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3900
3901 switch (event) {
3902 case RTM_NEWADDR:
95c385b4
NH		 3903 /*
3904 * If the address was optimistic
3905 * we inserted the route at the start of
3906 * our DAD process, so we don't need
3907 * to do it again
3908 */
3909 if (!(ifp->rt->rt6i_node))
3910 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3911 if (ifp->idev->cnf.forwarding)
3912 addrconf_join_anycast(ifp);
3913 break;
3914 case RTM_DELADDR:
3915 if (ifp->idev->cnf.forwarding)
3916 addrconf_leave_anycast(ifp);
3917 addrconf_leave_solict(ifp->idev, &ifp->addr);
3918 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3919 if (ip6_del_rt(ifp->rt))
1da177e4 3920 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3921 break;
3922 }
3923}
3924
3925static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3926{
8814c4b5 3927 rcu_read_lock_bh();
1da177e4
LT		 3928 if (likely(ifp->idev->dead == 0))
3929 __ipv6_ifa_notify(event, ifp);
8814c4b5 3930 rcu_read_unlock_bh();
1da177e4
LT		 3931}
3932
3933#ifdef CONFIG_SYSCTL
3934
3935static
3936int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3937 void __user *buffer, size_t *lenp, loff_t *ppos)
3938{
3939 int *valp = ctl->data;
3940 int val = *valp;
3941 int ret;
3942
3943 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3944
c8fecf22
PE		 3945 if (write)
3946 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3947 return ret;
1da177e4
LT		 3948}
3949
1ab1457c 3950static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3951 int __user *name, int nlen,
3952 void __user *oldval,
3953 size_t __user *oldlenp,
1f29bcd7 3954 void __user *newval, size_t newlen)
1da177e4
LT		 3955{
3956 int *valp = table->data;
c8fecf22 3957 int val = *valp;
1da177e4
LT		 3958 int new;
3959
3960 if (!newval || !newlen)
3961 return 0;
3962 if (newlen != sizeof(int))
3963 return -EINVAL;
3964 if (get_user(new, (int __user *)newval))
3965 return -EFAULT;
3966 if (new == *valp)
3967 return 0;
3968 if (oldval && oldlenp) {
3969 size_t len;
3970 if (get_user(len, oldlenp))
3971 return -EFAULT;
3972 if (len) {
3973 if (len > table->maxlen)
3974 len = table->maxlen;
3975 if (copy_to_user(oldval, valp, len))
3976 return -EFAULT;
3977 if (put_user(len, oldlenp))
3978 return -EFAULT;
3979 }
3980 }
3981
c8fecf22
PE		 3982 *valp = new;
3983 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3984 return 1;
3985}
3986
3987static struct addrconf_sysctl_table
3988{
3989 struct ctl_table_header *sysctl_header;
f6a07b29 3990 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 3991 char *dev_name;
ab32ea5d 3992} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3993 .sysctl_header = NULL,
3994 .addrconf_vars = {
1ab1457c 3995 {
1da177e4
LT		 3996 .ctl_name = NET_IPV6_FORWARDING,
3997 .procname = "forwarding",
1ab1457c 3998 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3999 .maxlen = sizeof(int),
4000 .mode = 0644,
1ab1457c 4001 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 4002 .strategy = &addrconf_sysctl_forward_strategy,
4003 },
4004 {
4005 .ctl_name = NET_IPV6_HOP_LIMIT,
4006 .procname = "hop_limit",
1ab1457c 4007 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4008 .maxlen = sizeof(int),
4009 .mode = 0644,
4010 .proc_handler = proc_dointvec,
4011 },
4012 {
4013 .ctl_name = NET_IPV6_MTU,
4014 .procname = "mtu",
4015 .data = &ipv6_devconf.mtu6,
1ab1457c 4016 .maxlen = sizeof(int),
1da177e4 4017 .mode = 0644,
1ab1457c 4018 .proc_handler = &proc_dointvec,
1da177e4
LT		 4019 },
4020 {
4021 .ctl_name = NET_IPV6_ACCEPT_RA,
4022 .procname = "accept_ra",
1ab1457c 4023 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4024 .maxlen = sizeof(int),
4025 .mode = 0644,
1ab1457c 4026 .proc_handler = &proc_dointvec,
1da177e4
LT		 4027 },
4028 {
4029 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4030 .procname = "accept_redirects",
1ab1457c 4031 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4032 .maxlen = sizeof(int),
4033 .mode = 0644,
1ab1457c 4034 .proc_handler = &proc_dointvec,
1da177e4
LT		 4035 },
4036 {
4037 .ctl_name = NET_IPV6_AUTOCONF,
4038 .procname = "autoconf",
1ab1457c 4039 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4040 .maxlen = sizeof(int),
4041 .mode = 0644,
1ab1457c 4042 .proc_handler = &proc_dointvec,
1da177e4
LT		 4043 },
4044 {
4045 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4046 .procname = "dad_transmits",
1ab1457c 4047 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4048 .maxlen = sizeof(int),
4049 .mode = 0644,
1ab1457c 4050 .proc_handler = &proc_dointvec,
1da177e4
LT		 4051 },
4052 {
4053 .ctl_name = NET_IPV6_RTR_SOLICITS,
4054 .procname = "router_solicitations",
1ab1457c 4055 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4056 .maxlen = sizeof(int),
4057 .mode = 0644,
1ab1457c 4058 .proc_handler = &proc_dointvec,
1da177e4
LT		 4059 },
4060 {
4061 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4062 .procname = "router_solicitation_interval",
1ab1457c 4063 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4064 .maxlen = sizeof(int),
4065 .mode = 0644,
1ab1457c 4066 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 4067 .strategy = &sysctl_jiffies,
4068 },
4069 {
4070 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4071 .procname = "router_solicitation_delay",
1ab1457c 4072 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4073 .maxlen = sizeof(int),
4074 .mode = 0644,
1ab1457c 4075 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 4076 .strategy = &sysctl_jiffies,
4077 },
4078 {
4079 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4080 .procname = "force_mld_version",
1ab1457c 4081 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4082 .maxlen = sizeof(int),
4083 .mode = 0644,
1ab1457c 4084 .proc_handler = &proc_dointvec,
1da177e4
LT		 4085 },
4086#ifdef CONFIG_IPV6_PRIVACY
4087 {
4088 .ctl_name = NET_IPV6_USE_TEMPADDR,
4089 .procname = "use_tempaddr",
1ab1457c 4090 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4091 .maxlen = sizeof(int),
4092 .mode = 0644,
1ab1457c 4093 .proc_handler = &proc_dointvec,
1da177e4
LT		 4094 },
4095 {
4096 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4097 .procname = "temp_valid_lft",
1ab1457c 4098 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4099 .maxlen = sizeof(int),
4100 .mode = 0644,
1ab1457c 4101 .proc_handler = &proc_dointvec,
1da177e4
LT		 4102 },
4103 {
4104 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4105 .procname = "temp_prefered_lft",
1ab1457c 4106 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4107 .maxlen = sizeof(int),
4108 .mode = 0644,
1ab1457c 4109 .proc_handler = &proc_dointvec,
1da177e4
LT		 4110 },
4111 {
4112 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4113 .procname = "regen_max_retry",
1ab1457c 4114 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4115 .maxlen = sizeof(int),
4116 .mode = 0644,
1ab1457c 4117 .proc_handler = &proc_dointvec,
1da177e4
LT		 4118 },
4119 {
4120 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4121 .procname = "max_desync_factor",
1ab1457c 4122 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4123 .maxlen = sizeof(int),
4124 .mode = 0644,
1ab1457c 4125 .proc_handler = &proc_dointvec,
1da177e4
LT		 4126 },
4127#endif
4128 {
4129 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4130 .procname = "max_addresses",
4131 .data = &ipv6_devconf.max_addresses,
4132 .maxlen = sizeof(int),
4133 .mode = 0644,
4134 .proc_handler = &proc_dointvec,
4135 },
65f5c7c1
YH		 4136 {
4137 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4138 .procname = "accept_ra_defrtr",
1ab1457c 4139 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4140 .maxlen = sizeof(int),
4141 .mode = 0644,
1ab1457c 4142 .proc_handler = &proc_dointvec,
65f5c7c1 4143 },
c4fd30eb
YH		 4144 {
4145 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4146 .procname = "accept_ra_pinfo",
1ab1457c 4147 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4148 .maxlen = sizeof(int),
4149 .mode = 0644,
1ab1457c 4150 .proc_handler = &proc_dointvec,
c4fd30eb 4151 },
930d6ff2
YH		 4152#ifdef CONFIG_IPV6_ROUTER_PREF
4153 {
4154 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4155 .procname = "accept_ra_rtr_pref",
4156 .data = &ipv6_devconf.accept_ra_rtr_pref,
4157 .maxlen = sizeof(int),
4158 .mode = 0644,
4159 .proc_handler = &proc_dointvec,
4160 },
52e16356
YH		 4161 {
4162 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4163 .procname = "router_probe_interval",
4164 .data = &ipv6_devconf.rtr_probe_interval,
4165 .maxlen = sizeof(int),
4166 .mode = 0644,
4167 .proc_handler = &proc_dointvec_jiffies,
4168 .strategy = &sysctl_jiffies,
4169 },
fa03ef38 4170#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4171 {
4172 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4173 .procname = "accept_ra_rt_info_max_plen",
4174 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4175 .maxlen = sizeof(int),
4176 .mode = 0644,
4177 .proc_handler = &proc_dointvec,
4178 },
4179#endif
930d6ff2 4180#endif
fbea49e1
YH		 4181 {
4182 .ctl_name = NET_IPV6_PROXY_NDP,
4183 .procname = "proxy_ndp",
4184 .data = &ipv6_devconf.proxy_ndp,
4185 .maxlen = sizeof(int),
4186 .mode = 0644,
4187 .proc_handler = &proc_dointvec,
4188 },
0bcbc926
YH		 4189 {
4190 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4191 .procname = "accept_source_route",
4192 .data = &ipv6_devconf.accept_source_route,
4193 .maxlen = sizeof(int),
4194 .mode = 0644,
4195 .proc_handler = &proc_dointvec,
4196 },
95c385b4
NH		 4197#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4198 {
4199 .ctl_name = CTL_UNNUMBERED,
4200 .procname = "optimistic_dad",
4201 .data = &ipv6_devconf.optimistic_dad,
4202 .maxlen = sizeof(int),
4203 .mode = 0644,
4204 .proc_handler = &proc_dointvec,
4205
4206 },
7bc570c8
YH		 4207#endif
4208#ifdef CONFIG_IPV6_MROUTE
4209 {
4210 .ctl_name = CTL_UNNUMBERED,
4211 .procname = "mc_forwarding",
4212 .data = &ipv6_devconf.mc_forwarding,
4213 .maxlen = sizeof(int),
4214 .mode = 0644,
4215 .proc_handler = &proc_dointvec,
4216 },
95c385b4 4217#endif
1da177e4
LT		 4218 {
4219 .ctl_name = 0, /* sentinel */
4220 }
4221 },
1da177e4
LT		 4222};
4223
bff16c2f
PE		 4224static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4225 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4226{
4227 int i;
1da177e4 4228 struct addrconf_sysctl_table *t;
1da177e4 4229
1dab6222
PE		 4230#define ADDRCONF_CTL_PATH_DEV 3
4231
4232 struct ctl_path addrconf_ctl_path[] = {
4233 { .procname = "net", .ctl_name = CTL_NET, },
4234 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4235 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4236 { /* to be set */ },
4237 { },
4238 };
4239
4240
af879cc7 4241 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4242 if (t == NULL)
f68635e6
PE		 4243 goto out;
4244
1da177e4
LT		 4245 for (i=0; t->addrconf_vars[i].data; i++) {
4246 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4247 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4248 t->addrconf_vars[i].extra2 = net;
1da177e4 4249 }
1da177e4 4250
1ab1457c
YH		 4251 /*
4252 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4253 * by sysctl and we wouldn't want anyone to change it under our feet
4254 * (see SIOCSIFNAME).
1ab1457c 4255 */
1dab6222
PE		 4256 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4257 if (!t->dev_name)
f68635e6 4258 goto free;
1da177e4 4259
1dab6222
PE		 4260 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4261 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4262
bff16c2f 4263 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4264 t->addrconf_vars);
1da177e4
LT		 4265 if (t->sysctl_header == NULL)
4266 goto free_procname;
f68635e6
PE		 4267
4268 p->sysctl = t;
95897312 4269 return 0;
1da177e4 4270
f68635e6 4271free_procname:
1dab6222 4272 kfree(t->dev_name);
f68635e6 4273free:
1da177e4 4274 kfree(t);
f68635e6 4275out:
95897312 4276 return -ENOBUFS;
1da177e4
LT		 4277}
4278
408c4768
PE		 4279static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4280{
4281 struct addrconf_sysctl_table *t;
4282
4283 if (p->sysctl == NULL)
4284 return;
4285
4286 t = p->sysctl;
4287 p->sysctl = NULL;
4288 unregister_sysctl_table(t->sysctl_header);
4289 kfree(t->dev_name);
4290 kfree(t);
4291}
4292
f52295a9
PE		 4293static void addrconf_sysctl_register(struct inet6_dev *idev)
4294{
408c4768
PE		 4295 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4296 NET_IPV6_NEIGH, "ipv6",
4297 &ndisc_ifinfo_sysctl_change,
0686caa3 4298 ndisc_ifinfo_sysctl_strategy);
c346dca1 4299 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4300 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4301}
4302
408c4768 4303static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4304{
408c4768
PE		 4305 __addrconf_sysctl_unregister(&idev->cnf);
4306 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4307}
4308
4309
4310#endif
4311
e0da5a48
PE		 4312static int addrconf_init_net(struct net *net)
4313{
4314 int err;
4315 struct ipv6_devconf *all, *dflt;
4316
4317 err = -ENOMEM;
4318 all = &ipv6_devconf;
4319 dflt = &ipv6_devconf_dflt;
4320
4321 if (net != &init_net) {
4322 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4323 if (all == NULL)
4324 goto err_alloc_all;
4325
4326 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4327 if (dflt == NULL)
4328 goto err_alloc_dflt;
4329 }
4330
4331 net->ipv6.devconf_all = all;
4332 net->ipv6.devconf_dflt = dflt;
4333
4334#ifdef CONFIG_SYSCTL
4335 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4336 NULL, all);
4337 if (err < 0)
4338 goto err_reg_all;
4339
4340 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4341 NULL, dflt);
4342 if (err < 0)
4343 goto err_reg_dflt;
4344#endif
4345 return 0;
4346
4347#ifdef CONFIG_SYSCTL
4348err_reg_dflt:
4349 __addrconf_sysctl_unregister(all);
4350err_reg_all:
4351 kfree(dflt);
4352#endif
4353err_alloc_dflt:
4354 kfree(all);
4355err_alloc_all:
4356 return err;
4357}
4358
4359static void addrconf_exit_net(struct net *net)
4360{
4361#ifdef CONFIG_SYSCTL
4362 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4363 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4364#endif
4365 if (net != &init_net) {
4366 kfree(net->ipv6.devconf_dflt);
4367 kfree(net->ipv6.devconf_all);
4368 }
4369}
4370
4371static struct pernet_operations addrconf_ops = {
4372 .init = addrconf_init_net,
4373 .exit = addrconf_exit_net,
4374};
4375
1da177e4
LT		 4376/*
4377 * Device notifier
4378 */
4379
4380int register_inet6addr_notifier(struct notifier_block *nb)
4381{
1ab1457c 4382 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4383}
4384
7159039a
YH		 4385EXPORT_SYMBOL(register_inet6addr_notifier);
4386
1da177e4
LT		 4387int unregister_inet6addr_notifier(struct notifier_block *nb)
4388{
1ab1457c 4389 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4390}
4391
7159039a
YH		 4392EXPORT_SYMBOL(unregister_inet6addr_notifier);
4393
af284937
DL		 4394static void addrconf_net_exit(struct net *net)
4395{
6fda7350
BT		 4396 struct net_device *dev;
4397
6fda7350
BT		 4398 rtnl_lock();
4399 /* clean dev list */
4400 for_each_netdev(net, dev) {
4401 if (__in6_dev_get(dev) == NULL)
4402 continue;
4403 addrconf_ifdown(dev, 1);
4404 }
4405 addrconf_ifdown(net->loopback_dev, 2);
4406 rtnl_unlock();
af284937
DL		 4407}
4408
4409static struct pernet_operations addrconf_net_ops = {
af284937
DL		 4410 .exit = addrconf_net_exit,
4411};
4412
1da177e4
LT		 4413/*
4414 * Init / cleanup code
4415 */
4416
4417int __init addrconf_init(void)
4418{
2a8cc6c8
YH		 4419 int err;
4420
4421 if ((err = ipv6_addr_label_init()) < 0) {
4422 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4423 err);
4424 return err;
4425 }
1da177e4 4426
e0da5a48
PE		 4427 register_pernet_subsys(&addrconf_ops);
4428
1da177e4
LT		 4429 /* The addrconf netdev notifier requires that loopback_dev
4430 * has it's ipv6 private information allocated and setup
4431 * before it can bring up and give link-local addresses
4432 * to other devices which are up.
4433 *
4434 * Unfortunately, loopback_dev is not necessarily the first
4435 * entry in the global dev_base list of net devices. In fact,
4436 * it is likely to be the very last entry on that list.
4437 * So this causes the notifier registry below to try and
4438 * give link-local addresses to all devices besides loopback_dev
4439 * first, then loopback_dev, which cases all the non-loopback_dev
4440 * devices to fail to get a link-local address.
4441 *
4442 * So, as a temporary fix, allocate the ipv6 structure for
4443 * loopback_dev first by hand.
4444 * Longer term, all of the dependencies ipv6 has upon the loopback
4445 * device and it being up should be removed.
4446 */
4447 rtnl_lock();
2774c7ab 4448 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4449 err = -ENOMEM;
4450 rtnl_unlock();
4451 if (err)
e0da5a48 4452 goto errlo;
1da177e4 4453
af284937
DL		 4454 err = register_pernet_device(&addrconf_net_ops);
4455 if (err)
4456 return err;
4457
1da177e4
LT		 4458 register_netdevice_notifier(&ipv6_dev_notf);
4459
1da177e4 4460 addrconf_verify(0);
c127ea2c
TG		 4461
4462 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4463 if (err < 0)
4464 goto errout;
4465
4466 /* Only the first call to __rtnl_register can fail */
4467 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4468 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4469 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4470 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4471 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4472
2a8cc6c8
YH		 4473 ipv6_addr_label_rtnl_register();
4474
1da177e4 4475 return 0;
c127ea2c
TG		 4476errout:
4477 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4478errlo:
4479 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4480
4481 return err;
1da177e4
LT		 4482}
4483
09f7709f 4484void addrconf_cleanup(void)
1da177e4 4485{
1ab1457c 4486 struct inet6_ifaddr *ifa;
1da177e4
LT		 4487 int i;
4488
4489 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4490 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4491
e0da5a48 4492 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4493
4494 rtnl_lock();
4495
1da177e4
LT		 4496 /*
4497 * Check hash table.
4498 */
1da177e4
LT		 4499 write_lock_bh(&addrconf_hash_lock);
4500 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4501 for (ifa=inet6_addr_lst[i]; ifa; ) {
4502 struct inet6_ifaddr *bifa;
4503
4504 bifa = ifa;
4505 ifa = ifa->lst_next;
4506 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4507 /* Do not free it; something is wrong.
4508 Now we can investigate it with debugger.
4509 */
4510 }
4511 }
4512 write_unlock_bh(&addrconf_hash_lock);
4513
4514 del_timer(&addr_chk_timer);
1da177e4 4515 rtnl_unlock();
af284937
DL		 4516
4517 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4518}
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