]> bbs.cooldavid.org Git - net-next-2.6.git/blame - net/ipv6/addrconf.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
ipv6/ndisc: join error paths
[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
1b34be74 122static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 123static int ipv6_count_addresses(struct inet6_dev *idev);
124
125/*
126 * Configured unicast address hash table
127 */
128static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
129static DEFINE_RWLOCK(addrconf_hash_lock);
130
1da177e4
LT		 131static void addrconf_verify(unsigned long);
132
8d06afab 133static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 134static DEFINE_SPINLOCK(addrconf_verify_lock);
135
136static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
137static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138
139static int addrconf_ifdown(struct net_device *dev, int how);
140
e431b8c0 141static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 142static void addrconf_dad_timer(unsigned long data);
143static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 144static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 145static void addrconf_rs_timer(unsigned long data);
146static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
147static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148
1ab1457c 149static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 150 struct prefix_info *pinfo);
06bfe655
DL		 151static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
152 struct net_device *dev);
1da177e4 153
e041c683 154static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 155
888c848e 156static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 157 .forwarding = 0,
158 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
159 .mtu6 = IPV6_MIN_MTU,
160 .accept_ra = 1,
161 .accept_redirects = 1,
162 .autoconf = 1,
163 .force_mld_version = 0,
164 .dad_transmits = 1,
165 .rtr_solicits = MAX_RTR_SOLICITATIONS,
166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
168#ifdef CONFIG_IPV6_PRIVACY
169 .use_tempaddr = 0,
170 .temp_valid_lft = TEMP_VALID_LIFETIME,
171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
172 .regen_max_retry = REGEN_MAX_RETRY,
173 .max_desync_factor = MAX_DESYNC_FACTOR,
174#endif
175 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 176 .accept_ra_defrtr = 1,
c4fd30eb 177 .accept_ra_pinfo = 1,
930d6ff2
YH		 178#ifdef CONFIG_IPV6_ROUTER_PREF
179 .accept_ra_rtr_pref = 1,
52e16356 180 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 181#ifdef CONFIG_IPV6_ROUTE_INFO
182 .accept_ra_rt_info_max_plen = 0,
183#endif
930d6ff2 184#endif
fbea49e1 185 .proxy_ndp = 0,
0bcbc926 186 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 187 .disable_ipv6 = 0,
1b34be74 188 .accept_dad = 1,
1da177e4
LT		 189};
190
ab32ea5d 191static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 192 .forwarding = 0,
193 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
194 .mtu6 = IPV6_MIN_MTU,
195 .accept_ra = 1,
196 .accept_redirects = 1,
197 .autoconf = 1,
198 .dad_transmits = 1,
199 .rtr_solicits = MAX_RTR_SOLICITATIONS,
200 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202#ifdef CONFIG_IPV6_PRIVACY
203 .use_tempaddr = 0,
204 .temp_valid_lft = TEMP_VALID_LIFETIME,
205 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
206 .regen_max_retry = REGEN_MAX_RETRY,
207 .max_desync_factor = MAX_DESYNC_FACTOR,
208#endif
209 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 210 .accept_ra_defrtr = 1,
c4fd30eb 211 .accept_ra_pinfo = 1,
930d6ff2
YH		 212#ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
52e16356 214 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 215#ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_max_plen = 0,
217#endif
930d6ff2 218#endif
fbea49e1 219 .proxy_ndp = 0,
0bcbc926 220 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 221 .disable_ipv6 = 0,
1b34be74 222 .accept_dad = 1,
1da177e4
LT		 223};
224
225/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 226const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 227const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 228const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
229const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 230
f24e3d65 231/* Check if a valid qdisc is available */
05297949 232static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 233{
05297949 234 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 235}
236
2b5ead46
YH		 237/* Check if a route is valid prefix route */
238static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
239{
240 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
241}
242
1da177e4
LT		 243static void addrconf_del_timer(struct inet6_ifaddr *ifp)
244{
245 if (del_timer(&ifp->timer))
246 __in6_ifa_put(ifp);
247}
248
249enum addrconf_timer_t
250{
251 AC_NONE,
252 AC_DAD,
253 AC_RS,
254};
255
256static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
257 enum addrconf_timer_t what,
258 unsigned long when)
259{
260 if (!del_timer(&ifp->timer))
261 in6_ifa_hold(ifp);
262
263 switch (what) {
264 case AC_DAD:
265 ifp->timer.function = addrconf_dad_timer;
266 break;
267 case AC_RS:
268 ifp->timer.function = addrconf_rs_timer;
269 break;
270 default:;
271 }
272 ifp->timer.expires = jiffies + when;
273 add_timer(&ifp->timer);
274}
275
7f7d9a6b
HX		 276static int snmp6_alloc_dev(struct inet6_dev *idev)
277{
7f7d9a6b 278 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 279 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 280 goto err_ip;
281 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 282 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 283 goto err_icmp;
14878f75 284 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 285 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 286 goto err_icmpmsg;
7f7d9a6b
HX		 287
288 return 0;
289
14878f75
DS		 290err_icmpmsg:
291 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 292err_icmp:
293 snmp_mib_free((void **)idev->stats.ipv6);
294err_ip:
aaf70ec7 295 return -ENOMEM;
7f7d9a6b
HX		 296}
297
16910b98 298static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 299{
14878f75 300 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 301 snmp_mib_free((void **)idev->stats.icmpv6);
302 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 303}
304
1da177e4
LT		 305/* Nobody refers to this device, we may destroy it. */
306
8814c4b5
YH		 307static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
308{
309 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
310 kfree(idev);
311}
312
1da177e4
LT		 313void in6_dev_finish_destroy(struct inet6_dev *idev)
314{
315 struct net_device *dev = idev->dev;
547b792c
IJ		 316
317 WARN_ON(idev->addr_list != NULL);
318 WARN_ON(idev->mc_list != NULL);
319
1da177e4
LT		 320#ifdef NET_REFCNT_DEBUG
321 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
322#endif
323 dev_put(dev);
324 if (!idev->dead) {
325 printk("Freeing alive inet6 device %p\n", idev);
326 return;
327 }
328 snmp6_free_dev(idev);
8814c4b5 329 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 330}
331
7159039a
YH		 332EXPORT_SYMBOL(in6_dev_finish_destroy);
333
1da177e4
LT		 334static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
335{
336 struct inet6_dev *ndev;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return NULL;
342
1ab1457c 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 344
1ab1457c
YH		 345 if (ndev == NULL)
346 return NULL;
322f74a4
IO		 347
348 rwlock_init(&ndev->lock);
349 ndev->dev = dev;
c346dca1 350 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 351 ndev->cnf.mtu6 = dev->mtu;
352 ndev->cnf.sysctl = NULL;
353 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
354 if (ndev->nd_parms == NULL) {
355 kfree(ndev);
356 return NULL;
357 }
0187bdfb
BH		 358 if (ndev->cnf.forwarding)
359 dev_disable_lro(dev);
322f74a4
IO		 360 /* We refer to the device */
361 dev_hold(dev);
1da177e4 362
322f74a4
IO		 363 if (snmp6_alloc_dev(ndev) < 0) {
364 ADBG((KERN_WARNING
365 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 366 __func__, dev->name));
322f74a4
IO		 367 neigh_parms_release(&nd_tbl, ndev->nd_parms);
368 ndev->dead = 1;
369 in6_dev_finish_destroy(ndev);
370 return NULL;
371 }
1da177e4 372
322f74a4
IO		 373 if (snmp6_register_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
382
383 /* One reference from device. We must do this before
384 * we invoke __ipv6_regen_rndid().
385 */
386 in6_dev_hold(ndev);
1da177e4 387
1b34be74
YH		 388 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
389 ndev->cnf.accept_dad = -1;
390
b077d7ab
YH		 391#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
392 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
393 printk(KERN_INFO
394 "%s: Disabled Multicast RS\n",
395 dev->name);
396 ndev->cnf.rtr_solicits = 0;
397 }
398#endif
399
1da177e4 400#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 401 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 402 if ((dev->flags&IFF_LOOPBACK) ||
403 dev->type == ARPHRD_TUNNEL ||
9625ed72 404 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 405 dev->type == ARPHRD_SIT ||
0be669bb 406 dev->type == ARPHRD_NONE) {
322f74a4
IO		 407 printk(KERN_INFO
408 "%s: Disabled Privacy Extensions\n",
409 dev->name);
410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
1da177e4
LT		 415#endif
416
f24e3d65 417 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 418 ndev->if_flags |= IF_READY;
419
322f74a4
IO		 420 ipv6_mc_init_dev(ndev);
421 ndev->tstamp = jiffies;
f52295a9 422 addrconf_sysctl_register(ndev);
30c4cf57
DS		 423 /* protected by rtnl_lock */
424 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 425
426 /* Join all-node multicast group */
f3ee4010 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 428
1da177e4
LT		 429 return ndev;
430}
431
cee89473 432static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 433{
434 struct inet6_dev *idev;
435
436 ASSERT_RTNL();
437
438 if ((idev = __in6_dev_get(dev)) == NULL) {
439 if ((idev = ipv6_add_dev(dev)) == NULL)
440 return NULL;
441 }
c5e33bdd 442
1da177e4
LT		 443 if (dev->flags&IFF_UP)
444 ipv6_mc_up(idev);
445 return idev;
446}
447
448#ifdef CONFIG_SYSCTL
449static void dev_forward_change(struct inet6_dev *idev)
450{
451 struct net_device *dev;
452 struct inet6_ifaddr *ifa;
1da177e4
LT		 453
454 if (!idev)
455 return;
456 dev = idev->dev;
0187bdfb
BH		 457 if (idev->cnf.forwarding)
458 dev_disable_lro(dev);
1da177e4 459 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 460 if (idev->cnf.forwarding)
f3ee4010 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 462 else
f3ee4010 463 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 464 }
465 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 466 if (ifa->flags&IFA_F_TENTATIVE)
467 continue;
1da177e4
LT		 468 if (idev->cnf.forwarding)
469 addrconf_join_anycast(ifa);
470 else
471 addrconf_leave_anycast(ifa);
472 }
473}
474
475
e186932b 476static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 477{
478 struct net_device *dev;
479 struct inet6_dev *idev;
480
481 read_lock(&dev_base_lock);
bff16c2f 482 for_each_netdev(net, dev) {
8814c4b5 483 rcu_read_lock();
1da177e4
LT		 484 idev = __in6_dev_get(dev);
485 if (idev) {
e186932b
PE		 486 int changed = (!idev->cnf.forwarding) ^ (!newf);
487 idev->cnf.forwarding = newf;
1da177e4
LT		 488 if (changed)
489 dev_forward_change(idev);
490 }
8814c4b5 491 rcu_read_unlock();
1da177e4
LT		 492 }
493 read_unlock(&dev_base_lock);
494}
c8fecf22
PE		 495
496static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
497{
bff16c2f
PE		 498 struct net *net;
499
500 net = (struct net *)table->extra2;
441fc2a2 501 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 502 return;
503
0187bdfb 504 rtnl_lock();
e186932b
PE		 505 if (p == &net->ipv6.devconf_all->forwarding) {
506 __s32 newf = net->ipv6.devconf_all->forwarding;
507 net->ipv6.devconf_dflt->forwarding = newf;
508 addrconf_forward_change(net, newf);
c8fecf22
PE		 509 } else if ((!*p) ^ (!old))
510 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 511 rtnl_unlock();
c8fecf22
PE		 512
513 if (*p)
7b4da532 514 rt6_purge_dflt_routers(net);
c8fecf22 515}
1da177e4
LT		 516#endif
517
518/* Nobody refers to this ifaddr, destroy it */
519
520void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
521{
547b792c
IJ		 522 WARN_ON(ifp->if_next != NULL);
523 WARN_ON(ifp->lst_next != NULL);
524
1da177e4
LT		 525#ifdef NET_REFCNT_DEBUG
526 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
527#endif
528
529 in6_dev_put(ifp->idev);
530
531 if (del_timer(&ifp->timer))
532 printk("Timer is still running, when freeing ifa=%p\n", ifp);
533
534 if (!ifp->dead) {
535 printk("Freeing alive inet6 address %p\n", ifp);
536 return;
537 }
538 dst_release(&ifp->rt->u.dst);
539
540 kfree(ifp);
541}
542
e55ffac6
BH		 543static void
544ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
545{
546 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 547 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 548
549 /*
550 * Each device address list is sorted in order of scope -
551 * global before linklocal.
552 */
553 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
554 ifap = &ifa->if_next) {
8a6ce0c0 555 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 556 break;
557 }
558
559 ifp->if_next = *ifap;
560 *ifap = ifp;
561}
562
3eb84f49
YH		 563/*
564 * Hash function taken from net_alias.c
565 */
566static u8 ipv6_addr_hash(const struct in6_addr *addr)
567{
568 __u32 word;
569
570 /*
571 * We perform the hash function over the last 64 bits of the address
572 * This will include the IEEE address token on links that support it.
573 */
574
575 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
576 word ^= (word >> 16);
577 word ^= (word >> 8);
578
579 return ((word ^ (word >> 4)) & 0x0f);
580}
581
1da177e4
LT		 582/* On success it returns ifp with increased reference count */
583
584static struct inet6_ifaddr *
585ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 586 int scope, u32 flags)
1da177e4
LT		 587{
588 struct inet6_ifaddr *ifa = NULL;
589 struct rt6_info *rt;
590 int hash;
591 int err = 0;
d68b8270
YH		 592 int addr_type = ipv6_addr_type(addr);
593
594 if (addr_type == IPV6_ADDR_ANY ||
595 addr_type & IPV6_ADDR_MULTICAST ||
596 (!(idev->dev->flags & IFF_LOOPBACK) &&
597 addr_type & IPV6_ADDR_LOOPBACK))
598 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 599
8814c4b5 600 rcu_read_lock_bh();
1da177e4
LT		 601 if (idev->dead) {
602 err = -ENODEV; /*XXX*/
603 goto out2;
604 }
605
606 write_lock(&addrconf_hash_lock);
607
608 /* Ignore adding duplicate addresses on an interface */
c346dca1 609 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 610 ADBG(("ipv6_add_addr: already assigned\n"));
611 err = -EEXIST;
612 goto out;
613 }
614
322f74a4 615 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 616
617 if (ifa == NULL) {
618 ADBG(("ipv6_add_addr: malloc failed\n"));
619 err = -ENOBUFS;
620 goto out;
621 }
622
623 rt = addrconf_dst_alloc(idev, addr, 0);
624 if (IS_ERR(rt)) {
625 err = PTR_ERR(rt);
626 goto out;
627 }
628
1da177e4
LT		 629 ipv6_addr_copy(&ifa->addr, addr);
630
631 spin_lock_init(&ifa->lock);
632 init_timer(&ifa->timer);
633 ifa->timer.data = (unsigned long) ifa;
634 ifa->scope = scope;
635 ifa->prefix_len = pfxlen;
636 ifa->flags = flags | IFA_F_TENTATIVE;
637 ifa->cstamp = ifa->tstamp = jiffies;
638
57f5f544
KF		 639 ifa->rt = rt;
640
95c385b4
NH		 641 /*
642 * part one of RFC 4429, section 3.3
643 * We should not configure an address as
644 * optimistic if we do not yet know the link
645 * layer address of our nexhop router
646 */
647
648 if (rt->rt6i_nexthop == NULL)
649 ifa->flags &= ~IFA_F_OPTIMISTIC;
650
1da177e4
LT		 651 ifa->idev = idev;
652 in6_dev_hold(idev);
653 /* For caller */
654 in6_ifa_hold(ifa);
655
656 /* Add to big hash table */
657 hash = ipv6_addr_hash(addr);
658
659 ifa->lst_next = inet6_addr_lst[hash];
660 inet6_addr_lst[hash] = ifa;
661 in6_ifa_hold(ifa);
662 write_unlock(&addrconf_hash_lock);
663
664 write_lock(&idev->lock);
665 /* Add to inet6_dev unicast addr list. */
e55ffac6 666 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 667
668#ifdef CONFIG_IPV6_PRIVACY
669 if (ifa->flags&IFA_F_TEMPORARY) {
670 ifa->tmp_next = idev->tempaddr_list;
671 idev->tempaddr_list = ifa;
672 in6_ifa_hold(ifa);
673 }
674#endif
675
1da177e4
LT		 676 in6_ifa_hold(ifa);
677 write_unlock(&idev->lock);
678out2:
8814c4b5 679 rcu_read_unlock_bh();
1da177e4 680
fd92833a 681 if (likely(err == 0))
e041c683 682 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 683 else {
684 kfree(ifa);
685 ifa = ERR_PTR(err);
686 }
687
688 return ifa;
689out:
690 write_unlock(&addrconf_hash_lock);
691 goto out2;
692}
693
694/* This function wants to get referenced ifp and releases it before return */
695
696static void ipv6_del_addr(struct inet6_ifaddr *ifp)
697{
698 struct inet6_ifaddr *ifa, **ifap;
699 struct inet6_dev *idev = ifp->idev;
700 int hash;
701 int deleted = 0, onlink = 0;
702 unsigned long expires = jiffies;
703
704 hash = ipv6_addr_hash(&ifp->addr);
705
706 ifp->dead = 1;
707
708 write_lock_bh(&addrconf_hash_lock);
709 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
710 ifap = &ifa->lst_next) {
711 if (ifa == ifp) {
712 *ifap = ifa->lst_next;
713 __in6_ifa_put(ifp);
714 ifa->lst_next = NULL;
715 break;
716 }
717 }
718 write_unlock_bh(&addrconf_hash_lock);
719
720 write_lock_bh(&idev->lock);
721#ifdef CONFIG_IPV6_PRIVACY
722 if (ifp->flags&IFA_F_TEMPORARY) {
723 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
724 ifap = &ifa->tmp_next) {
725 if (ifa == ifp) {
726 *ifap = ifa->tmp_next;
727 if (ifp->ifpub) {
728 in6_ifa_put(ifp->ifpub);
729 ifp->ifpub = NULL;
730 }
731 __in6_ifa_put(ifp);
732 ifa->tmp_next = NULL;
733 break;
734 }
735 }
736 }
737#endif
738
1d142804 739 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 740 if (ifa == ifp) {
741 *ifap = ifa->if_next;
742 __in6_ifa_put(ifp);
743 ifa->if_next = NULL;
744 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
745 break;
746 deleted = 1;
1d142804 747 continue;
1da177e4
LT		 748 } else if (ifp->flags & IFA_F_PERMANENT) {
749 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
750 ifp->prefix_len)) {
751 if (ifa->flags & IFA_F_PERMANENT) {
752 onlink = 1;
753 if (deleted)
754 break;
755 } else {
756 unsigned long lifetime;
757
758 if (!onlink)
759 onlink = -1;
760
761 spin_lock(&ifa->lock);
4bed72e4
YH		 762
763 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
764 /*
765 * Note: Because this address is
766 * not permanent, lifetime <
767 * LONG_MAX / HZ here.
768 */
1da177e4
LT		 769 if (time_before(expires,
770 ifa->tstamp + lifetime * HZ))
771 expires = ifa->tstamp + lifetime * HZ;
772 spin_unlock(&ifa->lock);
773 }
774 }
775 }
1d142804 776 ifap = &ifa->if_next;
1da177e4
LT		 777 }
778 write_unlock_bh(&idev->lock);
779
b2238566
AV		 780 addrconf_del_timer(ifp);
781
1da177e4
LT		 782 ipv6_ifa_notify(RTM_DELADDR, ifp);
783
e041c683 784 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 785
1da177e4
LT		 786 /*
787 * Purge or update corresponding prefix
788 *
789 * 1) we don't purge prefix here if address was not permanent.
790 * prefix is managed by its own lifetime.
791 * 2) if there're no addresses, delete prefix.
792 * 3) if there're still other permanent address(es),
793 * corresponding prefix is still permanent.
794 * 4) otherwise, update prefix lifetime to the
795 * longest valid lifetime among the corresponding
796 * addresses on the device.
797 * Note: subsequent RA will update lifetime.
798 *
799 * --yoshfuji
800 */
801 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
802 struct in6_addr prefix;
803 struct rt6_info *rt;
c346dca1 804 struct net *net = dev_net(ifp->idev->dev);
1da177e4 805 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 806 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 807
2b5ead46 808 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 809 if (onlink == 0) {
e0a1ad73 810 ip6_del_rt(rt);
1da177e4
LT		 811 rt = NULL;
812 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
813 rt->rt6i_expires = expires;
814 rt->rt6i_flags |= RTF_EXPIRES;
815 }
816 }
817 dst_release(&rt->u.dst);
818 }
819
820 in6_ifa_put(ifp);
821}
822
823#ifdef CONFIG_IPV6_PRIVACY
824static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
825{
826 struct inet6_dev *idev = ifp->idev;
827 struct in6_addr addr, *tmpaddr;
828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 829 unsigned long regen_advance;
1da177e4
LT		 830 int tmp_plen;
831 int ret = 0;
832 int max_addresses;
95c385b4 833 u32 addr_flags;
1da177e4
LT		 834
835 write_lock(&idev->lock);
836 if (ift) {
837 spin_lock_bh(&ift->lock);
838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
839 spin_unlock_bh(&ift->lock);
840 tmpaddr = &addr;
841 } else {
842 tmpaddr = NULL;
843 }
844retry:
845 in6_dev_hold(idev);
846 if (idev->cnf.use_tempaddr <= 0) {
847 write_unlock(&idev->lock);
848 printk(KERN_INFO
849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
850 in6_dev_put(idev);
851 ret = -1;
852 goto out;
853 }
854 spin_lock_bh(&ifp->lock);
855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
856 idev->cnf.use_tempaddr = -1; /*XXX*/
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
859 printk(KERN_WARNING
860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 in6_ifa_hold(ifp);
866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
872 in6_ifa_put(ifp);
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 memcpy(&addr.s6_addr[8], idev->rndid, 8);
878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
880 idev->cnf.temp_valid_lft);
1ab1457c
YH		 881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
1da177e4
LT		 883 idev->cnf.temp_prefered_lft - desync_factor / HZ);
884 tmp_plen = ifp->prefix_len;
885 max_addresses = idev->cnf.max_addresses;
886 tmp_cstamp = ifp->cstamp;
887 tmp_tstamp = ifp->tstamp;
888 spin_unlock_bh(&ifp->lock);
889
eac55bf9
BB		 890 regen_advance = idev->cnf.regen_max_retry *
891 idev->cnf.dad_transmits *
892 idev->nd_parms->retrans_time / HZ;
1da177e4 893 write_unlock(&idev->lock);
95c385b4 894
eac55bf9
BB		 895 /* A temporary address is created only if this calculated Preferred
896 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
897 * an implementation must not create a temporary address with a zero
898 * Preferred Lifetime.
899 */
900 if (tmp_prefered_lft <= regen_advance) {
901 in6_ifa_put(ifp);
902 in6_dev_put(idev);
903 ret = -1;
904 goto out;
905 }
906
95c385b4
NH		 907 addr_flags = IFA_F_TEMPORARY;
908 /* set in addrconf_prefix_rcv() */
909 if (ifp->flags & IFA_F_OPTIMISTIC)
910 addr_flags |= IFA_F_OPTIMISTIC;
911
1da177e4 912 ift = !max_addresses ||
1ab1457c 913 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 914 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 915 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
916 addr_flags) : NULL;
1da177e4
LT		 917 if (!ift || IS_ERR(ift)) {
918 in6_ifa_put(ifp);
919 in6_dev_put(idev);
920 printk(KERN_INFO
921 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
922 tmpaddr = &addr;
923 write_lock(&idev->lock);
924 goto retry;
925 }
926
927 spin_lock_bh(&ift->lock);
928 ift->ifpub = ifp;
929 ift->valid_lft = tmp_valid_lft;
930 ift->prefered_lft = tmp_prefered_lft;
931 ift->cstamp = tmp_cstamp;
932 ift->tstamp = tmp_tstamp;
933 spin_unlock_bh(&ift->lock);
934
935 addrconf_dad_start(ift, 0);
936 in6_ifa_put(ift);
937 in6_dev_put(idev);
938out:
939 return ret;
940}
941#endif
942
943/*
072047e4 944 * Choose an appropriate source address (RFC3484)
1da177e4 945 */
a9b05723
YH		 946enum {
947 IPV6_SADDR_RULE_INIT = 0,
948 IPV6_SADDR_RULE_LOCAL,
949 IPV6_SADDR_RULE_SCOPE,
950 IPV6_SADDR_RULE_PREFERRED,
951#ifdef CONFIG_IPV6_MIP6
952 IPV6_SADDR_RULE_HOA,
953#endif
954 IPV6_SADDR_RULE_OIF,
955 IPV6_SADDR_RULE_LABEL,
956#ifdef CONFIG_IPV6_PRIVACY
957 IPV6_SADDR_RULE_PRIVACY,
958#endif
959 IPV6_SADDR_RULE_ORCHID,
960 IPV6_SADDR_RULE_PREFIX,
961 IPV6_SADDR_RULE_MAX
962};
963
072047e4 964struct ipv6_saddr_score {
a9b05723
YH		 965 int rule;
966 int addr_type;
967 struct inet6_ifaddr *ifa;
968 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
969 int scopedist;
970 int matchlen;
072047e4
YH		 971};
972
a9b05723 973struct ipv6_saddr_dst {
9acd9f3a 974 const struct in6_addr *addr;
a9b05723
YH		 975 int ifindex;
976 int scope;
977 int label;
7cbca67c 978 unsigned int prefs;
a9b05723 979};
072047e4 980
b6f99a21 981static inline int ipv6_saddr_preferred(int type)
1da177e4 982{
072047e4
YH		 983 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
984 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
985 return 1;
986 return 0;
1da177e4
LT		 987}
988
3de23255
BT		 989static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
a9b05723
YH		 991 struct ipv6_saddr_dst *dst,
992 int i)
993{
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053#ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
7cbca67c 1055 {
a9b05723 1056 /* Rule 4: Prefer home address */
7cbca67c
YH		 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1059 break;
7cbca67c 1060 }
a9b05723
YH		 1061#endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
3de23255
BT		 1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073#ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1075 {
a9b05723
YH		 1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1078 */
7cbca67c
YH		 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1083 break;
7cbca67c 1084 }
a9b05723
YH		 1085#endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105out:
1106 return ret;
1107}
1108
191cd582 1109int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1110 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1111 struct in6_addr *saddr)
1da177e4 1112{
a9b05723
YH		 1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1115 struct ipv6_saddr_dst dst;
072047e4 1116 struct net_device *dev;
a9b05723 1117 int dst_type;
1da177e4 1118
a9b05723
YH		 1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1124 dst.prefs = prefs;
a9b05723
YH		 1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1da177e4 1128
072047e4 1129 read_lock(&dev_base_lock);
8814c4b5 1130 rcu_read_lock();
1da177e4 1131
6fda7350 1132 for_each_netdev(net, dev) {
072047e4 1133 struct inet6_dev *idev;
072047e4 1134
a9b05723 1135 /* Candidate Source Address (section 4)
072047e4
YH		 1136 * - multicast and link-local destination address,
1137 * the set of candidate source address MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same link as the outgoing
1140 * interface.
1141 * (- For site-local destination addresses, the
1142 * set of candidate source addresses MUST only
1143 * include addresses assigned to interfaces
1144 * belonging to the same site as the outgoing
1145 * interface.)
1146 */
a9b05723
YH		 1147 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1150 continue;
1da177e4 1151
1da177e4 1152 idev = __in6_dev_get(dev);
072047e4
YH		 1153 if (!idev)
1154 continue;
1155
1156 read_lock_bh(&idev->lock);
a9b05723
YH		 1157 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1158 int i;
072047e4 1159
a9b05723 1160 /*
6b3ae80a
YH		 1161 * - Tentative Address (RFC2462 section 5.4)
1162 * - A tentative address is not considered
1163 * "assigned to an interface" in the traditional
95c385b4 1164 * sense, unless it is also flagged as optimistic.
6b3ae80a 1165 * - Candidate Source Address (section 4)
072047e4
YH		 1166 * - In any case, anycast addresses, multicast
1167 * addresses, and the unspecified address MUST
1168 * NOT be included in a candidate set.
1169 */
a9b05723
YH		 1170 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1172 continue;
a9b05723
YH		 1173
1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1178 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1179 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1180 "assigned as unicast address on %s",
1181 dev->name);
1182 continue;
1183 }
1184
a9b05723
YH		 1185 score->rule = -1;
1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189 int minihiscore, miniscore;
1190
3de23255
BT		 1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1193
1194 if (minihiscore > miniscore) {
1195 if (i == IPV6_SADDR_RULE_SCOPE &&
1196 score->scopedist > 0) {
1197 /*
1198 * special case:
1199 * each remaining entry
1200 * has too small (not enough)
1201 * scope, because ifa entries
1202 * are sorted by their scope
1203 * values.
1204 */
1205 goto try_nextdev;
1206 }
1207 break;
1208 } else if (minihiscore < miniscore) {
1209 struct ipv6_saddr_score *tmp;
1210
1211 if (hiscore->ifa)
1212 in6_ifa_put(hiscore->ifa);
1213
1214 in6_ifa_hold(score->ifa);
1215
1216 tmp = hiscore;
1217 hiscore = score;
1218 score = tmp;
1219
1220 /* restore our iterator */
1221 score->ifa = hiscore->ifa;
1222
1223 break;
1da177e4 1224 }
072047e4 1225 }
1da177e4 1226 }
a9b05723 1227try_nextdev:
072047e4 1228 read_unlock_bh(&idev->lock);
1da177e4 1229 }
8814c4b5 1230 rcu_read_unlock();
1da177e4
LT		 1231 read_unlock(&dev_base_lock);
1232
a9b05723 1233 if (!hiscore->ifa)
072047e4 1234 return -EADDRNOTAVAIL;
1ab1457c 1235
a9b05723
YH		 1236 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1237 in6_ifa_put(hiscore->ifa);
072047e4 1238 return 0;
1da177e4
LT		 1239}
1240
5e5f3f0f 1241EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1242
95c385b4
NH		 1243int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1244 unsigned char banned_flags)
1da177e4
LT		 1245{
1246 struct inet6_dev *idev;
1247 int err = -EADDRNOTAVAIL;
1248
8814c4b5 1249 rcu_read_lock();
1da177e4
LT		 1250 if ((idev = __in6_dev_get(dev)) != NULL) {
1251 struct inet6_ifaddr *ifp;
1252
1253 read_lock_bh(&idev->lock);
1254 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1255 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1256 ipv6_addr_copy(addr, &ifp->addr);
1257 err = 0;
1258 break;
1259 }
1260 }
1261 read_unlock_bh(&idev->lock);
1262 }
8814c4b5 1263 rcu_read_unlock();
1da177e4
LT		 1264 return err;
1265}
1266
1267static int ipv6_count_addresses(struct inet6_dev *idev)
1268{
1269 int cnt = 0;
1270 struct inet6_ifaddr *ifp;
1271
1272 read_lock_bh(&idev->lock);
1273 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1274 cnt++;
1275 read_unlock_bh(&idev->lock);
1276 return cnt;
1277}
1278
bfeade08
DL		 1279int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1280 struct net_device *dev, int strict)
1da177e4
LT		 1281{
1282 struct inet6_ifaddr * ifp;
1283 u8 hash = ipv6_addr_hash(addr);
1284
1285 read_lock_bh(&addrconf_hash_lock);
1286 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1287 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1288 continue;
1da177e4
LT		 1289 if (ipv6_addr_equal(&ifp->addr, addr) &&
1290 !(ifp->flags&IFA_F_TENTATIVE)) {
1291 if (dev == NULL || ifp->idev->dev == dev ||
1292 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1293 break;
1294 }
1295 }
1296 read_unlock_bh(&addrconf_hash_lock);
1297 return ifp != NULL;
1298}
7159039a
YH		 1299EXPORT_SYMBOL(ipv6_chk_addr);
1300
1da177e4 1301static
06bfe655
DL		 1302int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1303 struct net_device *dev)
1da177e4
LT		 1304{
1305 struct inet6_ifaddr * ifp;
1306 u8 hash = ipv6_addr_hash(addr);
1307
1308 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1309 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1310 continue;
1da177e4
LT		 1311 if (ipv6_addr_equal(&ifp->addr, addr)) {
1312 if (dev == NULL || ifp->idev->dev == dev)
1313 break;
1314 }
1315 }
1316 return ifp != NULL;
1317}
1318
52eeeb84
YH		 1319int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1320{
1321 struct inet6_dev *idev;
1322 struct inet6_ifaddr *ifa;
1323 int onlink;
1324
1325 onlink = 0;
1326 rcu_read_lock();
1327 idev = __in6_dev_get(dev);
1328 if (idev) {
1329 read_lock_bh(&idev->lock);
1330 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1331 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1332 ifa->prefix_len);
1333 if (onlink)
1334 break;
1335 }
1336 read_unlock_bh(&idev->lock);
1337 }
1338 rcu_read_unlock();
1339 return onlink;
1340}
1341
1342EXPORT_SYMBOL(ipv6_chk_prefix);
1343
9acd9f3a 1344struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1345 struct net_device *dev, int strict)
1da177e4
LT		 1346{
1347 struct inet6_ifaddr * ifp;
1348 u8 hash = ipv6_addr_hash(addr);
1349
1350 read_lock_bh(&addrconf_hash_lock);
1351 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1352 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1353 continue;
1da177e4
LT		 1354 if (ipv6_addr_equal(&ifp->addr, addr)) {
1355 if (dev == NULL || ifp->idev->dev == dev ||
1356 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
1362 read_unlock_bh(&addrconf_hash_lock);
1363
1364 return ifp;
1365}
1366
1367int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1368{
1369 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1370 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1371 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1372 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1373 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1374 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1375 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1376 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1377
1378 if (!sk2_rcv_saddr && !sk_ipv6only)
1379 return 1;
1380
1381 if (addr_type2 == IPV6_ADDR_ANY &&
1382 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1383 return 1;
1384
1385 if (addr_type == IPV6_ADDR_ANY &&
1386 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1387 return 1;
1388
1389 if (sk2_rcv_saddr6 &&
1390 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1391 return 1;
1392
1393 if (addr_type == IPV6_ADDR_MAPPED &&
1394 !sk2_ipv6only &&
1395 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1396 return 1;
1397
1398 return 0;
1399}
1400
1401/* Gets referenced address, destroys ifaddr */
1402
9f5336e2 1403static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1404{
1da177e4
LT		 1405 if (ifp->flags&IFA_F_PERMANENT) {
1406 spin_lock_bh(&ifp->lock);
1407 addrconf_del_timer(ifp);
1408 ifp->flags |= IFA_F_TENTATIVE;
1409 spin_unlock_bh(&ifp->lock);
1410 in6_ifa_put(ifp);
1411#ifdef CONFIG_IPV6_PRIVACY
1412 } else if (ifp->flags&IFA_F_TEMPORARY) {
1413 struct inet6_ifaddr *ifpub;
1414 spin_lock_bh(&ifp->lock);
1415 ifpub = ifp->ifpub;
1416 if (ifpub) {
1417 in6_ifa_hold(ifpub);
1418 spin_unlock_bh(&ifp->lock);
1419 ipv6_create_tempaddr(ifpub, ifp);
1420 in6_ifa_put(ifpub);
1421 } else {
1422 spin_unlock_bh(&ifp->lock);
1423 }
1424 ipv6_del_addr(ifp);
1425#endif
1426 } else
1427 ipv6_del_addr(ifp);
1428}
1429
3c21edbd
YH		 1430void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1431{
1b34be74
YH		 1432 struct inet6_dev *idev = ifp->idev;
1433 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1434 struct in6_addr addr;
1435
1436 addr.s6_addr32[0] = htonl(0xfe800000);
1437 addr.s6_addr32[1] = 0;
1438
1439 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1440 ipv6_addr_equal(&ifp->addr, &addr)) {
1441 /* DAD failed for link-local based on MAC address */
1442 idev->cnf.disable_ipv6 = 1;
1443 }
1444 }
1445
3c21edbd
YH		 1446 if (net_ratelimit())
1447 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1448 addrconf_dad_stop(ifp);
1449}
1da177e4
LT		 1450
1451/* Join to solicited addr multicast group. */
1452
1453void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1454{
1455 struct in6_addr maddr;
1456
1457 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1458 return;
1459
1460 addrconf_addr_solict_mult(addr, &maddr);
1461 ipv6_dev_mc_inc(dev, &maddr);
1462}
1463
1464void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1465{
1466 struct in6_addr maddr;
1467
1468 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469 return;
1470
1471 addrconf_addr_solict_mult(addr, &maddr);
1472 __ipv6_dev_mc_dec(idev, &maddr);
1473}
1474
20380731 1475static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1476{
1477 struct in6_addr addr;
1478 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1479 if (ipv6_addr_any(&addr))
1480 return;
1481 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1482}
1483
20380731 1484static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1485{
1486 struct in6_addr addr;
1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1488 if (ipv6_addr_any(&addr))
1489 return;
1490 __ipv6_dev_ac_dec(ifp->idev, &addr);
1491}
1492
073a8e0e
YH		 1493static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1494{
1495 if (dev->addr_len != ETH_ALEN)
1496 return -1;
1497 memcpy(eui, dev->dev_addr, 3);
1498 memcpy(eui + 5, dev->dev_addr + 3, 3);
1499
1500 /*
1501 * The zSeries OSA network cards can be shared among various
1502 * OS instances, but the OSA cards have only one MAC address.
1503 * This leads to duplicate address conflicts in conjunction
1504 * with IPv6 if more than one instance uses the same card.
1505 *
1506 * The driver for these cards can deliver a unique 16-bit
1507 * identifier for each instance sharing the same card. It is
1508 * placed instead of 0xFFFE in the interface identifier. The
1509 * "u" bit of the interface identifier is not inverted in this
1510 * case. Hence the resulting interface identifier has local
1511 * scope according to RFC2373.
1512 */
1513 if (dev->dev_id) {
1514 eui[3] = (dev->dev_id >> 8) & 0xFF;
1515 eui[4] = dev->dev_id & 0xFF;
1516 } else {
1517 eui[3] = 0xFF;
1518 eui[4] = 0xFE;
1519 eui[0] ^= 2;
1520 }
1521 return 0;
1522}
1523
1524static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1525{
1526 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1527 if (dev->addr_len != ARCNET_ALEN)
1528 return -1;
1529 memset(eui, 0, 7);
1530 eui[7] = *(u8*)dev->dev_addr;
1531 return 0;
1532}
1533
1534static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1535{
1536 if (dev->addr_len != INFINIBAND_ALEN)
1537 return -1;
1538 memcpy(eui, dev->dev_addr + 12, 8);
1539 eui[0] |= 2;
1540 return 0;
1541}
1542
dfd982ba
YH		 1543int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1544{
1545 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1546 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1547 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1548 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1549 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1550 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1551 eui[1] = 0;
1552 eui[2] = 0x5E;
1553 eui[3] = 0xFE;
1554 memcpy(eui + 4, &addr, 4);
1555 return 0;
1556}
1557EXPORT_SYMBOL(__ipv6_isatap_ifid);
1558
1559static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560{
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564}
1565
1da177e4
LT		 1566static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1567{
1568 switch (dev->type) {
1569 case ARPHRD_ETHER:
1570 case ARPHRD_FDDI:
1571 case ARPHRD_IEEE802_TR:
073a8e0e 1572 return addrconf_ifid_eui48(eui, dev);
1da177e4 1573 case ARPHRD_ARCNET:
073a8e0e 1574 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1575 case ARPHRD_INFINIBAND:
073a8e0e 1576 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1577 case ARPHRD_SIT:
dfd982ba 1578 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1579 }
1580 return -1;
1581}
1582
1583static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584{
1585 int err = -1;
1586 struct inet6_ifaddr *ifp;
1587
1588 read_lock_bh(&idev->lock);
1589 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1590 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591 memcpy(eui, ifp->addr.s6_addr+8, 8);
1592 err = 0;
1593 break;
1594 }
1595 }
1596 read_unlock_bh(&idev->lock);
1597 return err;
1598}
1599
1600#ifdef CONFIG_IPV6_PRIVACY
1601/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602static int __ipv6_regen_rndid(struct inet6_dev *idev)
1603{
1da177e4 1604regen:
955189ef 1605 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1606 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1607
1608 /*
1609 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610 * check if generated address is not inappropriate
1611 *
1612 * - Reserved subnet anycast (RFC 2526)
1613 * 11111101 11....11 1xxxxxxx
c7dc89c0 1614 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1615 * 00-00-5E-FE-xx-xx-xx-xx
1616 * - value 0
1617 * - XXX: already assigned to an address on the device
1618 */
1ab1457c 1619 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1620 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621 (idev->rndid[7]&0x80))
1622 goto regen;
1623 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625 goto regen;
1626 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627 goto regen;
1628 }
1629
1630 return 0;
1631}
1632
1633static void ipv6_regen_rndid(unsigned long data)
1634{
1635 struct inet6_dev *idev = (struct inet6_dev *) data;
1636 unsigned long expires;
1637
8814c4b5 1638 rcu_read_lock_bh();
1da177e4
LT		 1639 write_lock_bh(&idev->lock);
1640
1641 if (idev->dead)
1642 goto out;
1643
1644 if (__ipv6_regen_rndid(idev) < 0)
1645 goto out;
1ab1457c 1646
1da177e4 1647 expires = jiffies +
1ab1457c 1648 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1649 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1650 if (time_before(expires, jiffies)) {
1651 printk(KERN_WARNING
1652 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1653 idev->dev->name);
1654 goto out;
1655 }
1656
1657 if (!mod_timer(&idev->regen_timer, expires))
1658 in6_dev_hold(idev);
1659
1660out:
1661 write_unlock_bh(&idev->lock);
8814c4b5 1662 rcu_read_unlock_bh();
1da177e4
LT		 1663 in6_dev_put(idev);
1664}
1665
1666static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1667 int ret = 0;
1668
1669 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1670 ret = __ipv6_regen_rndid(idev);
1671 return ret;
1672}
1673#endif
1674
1675/*
1676 * Add prefix route.
1677 */
1678
1679static void
1680addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1681 unsigned long expires, u32 flags)
1da177e4 1682{
86872cb5
TG		 1683 struct fib6_config cfg = {
1684 .fc_table = RT6_TABLE_PREFIX,
1685 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1686 .fc_ifindex = dev->ifindex,
1687 .fc_expires = expires,
1688 .fc_dst_len = plen,
1689 .fc_flags = RTF_UP | flags,
c346dca1 1690 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1691 .fc_protocol = RTPROT_KERNEL,
86872cb5 1692 };
1da177e4 1693
86872cb5 1694 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1695
1696 /* Prevent useless cloning on PtP SIT.
1697 This thing is done here expecting that the whole
1698 class of non-broadcast devices need not cloning.
1699 */
0be669bb 1700#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1701 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1702 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1703#endif
1da177e4 1704
86872cb5 1705 ip6_route_add(&cfg);
1da177e4
LT		 1706}
1707
1708/* Create "default" multicast route to the interface */
1709
1710static void addrconf_add_mroute(struct net_device *dev)
1711{
86872cb5
TG		 1712 struct fib6_config cfg = {
1713 .fc_table = RT6_TABLE_LOCAL,
1714 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1715 .fc_ifindex = dev->ifindex,
1716 .fc_dst_len = 8,
1717 .fc_flags = RTF_UP,
c346dca1 1718 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1719 };
1720
1721 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1722
1723 ip6_route_add(&cfg);
1da177e4
LT		 1724}
1725
0be669bb 1726#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1727static void sit_route_add(struct net_device *dev)
1728{
86872cb5
TG		 1729 struct fib6_config cfg = {
1730 .fc_table = RT6_TABLE_MAIN,
1731 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1732 .fc_ifindex = dev->ifindex,
1733 .fc_dst_len = 96,
1734 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1735 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1736 };
1da177e4
LT		 1737
1738 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1739 ip6_route_add(&cfg);
1da177e4 1740}
0be669bb 1741#endif
1da177e4
LT		 1742
1743static void addrconf_add_lroute(struct net_device *dev)
1744{
1745 struct in6_addr addr;
1746
1747 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1748 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1749}
1750
1751static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1752{
1753 struct inet6_dev *idev;
1754
1755 ASSERT_RTNL();
1756
1757 if ((idev = ipv6_find_idev(dev)) == NULL)
1758 return NULL;
1759
1760 /* Add default multicast route */
1761 addrconf_add_mroute(dev);
1762
1763 /* Add link local route */
1764 addrconf_add_lroute(dev);
1765 return idev;
1766}
1767
1768void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1769{
1770 struct prefix_info *pinfo;
1771 __u32 valid_lft;
1772 __u32 prefered_lft;
1773 int addr_type;
1da177e4
LT		 1774 struct inet6_dev *in6_dev;
1775
1776 pinfo = (struct prefix_info *) opt;
1ab1457c 1777
1da177e4
LT		 1778 if (len < sizeof(struct prefix_info)) {
1779 ADBG(("addrconf: prefix option too short\n"));
1780 return;
1781 }
1ab1457c 1782
1da177e4
LT		 1783 /*
1784 * Validation checks ([ADDRCONF], page 19)
1785 */
1786
1787 addr_type = ipv6_addr_type(&pinfo->prefix);
1788
1789 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1790 return;
1791
1792 valid_lft = ntohl(pinfo->valid);
1793 prefered_lft = ntohl(pinfo->prefered);
1794
1795 if (prefered_lft > valid_lft) {
1796 if (net_ratelimit())
1797 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1798 return;
1799 }
1800
1801 in6_dev = in6_dev_get(dev);
1802
1803 if (in6_dev == NULL) {
1804 if (net_ratelimit())
1805 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1806 return;
1807 }
1808
1809 /*
1810 * Two things going on here:
1811 * 1) Add routes for on-link prefixes
1812 * 2) Configure prefixes with the auto flag set
1813 */
1814
4bed72e4
YH		 1815 if (pinfo->onlink) {
1816 struct rt6_info *rt;
1817 unsigned long rt_expires;
1818
6f704992
YH		 1819 /* Avoid arithmetic overflow. Really, we could
1820 * save rt_expires in seconds, likely valid_lft,
1821 * but it would require division in fib gc, that it
1822 * not good.
1823 */
4bed72e4
YH		 1824 if (HZ > USER_HZ)
1825 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1826 else
1827 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1828
4bed72e4
YH		 1829 if (addrconf_finite_timeout(rt_expires))
1830 rt_expires *= HZ;
1da177e4 1831
c346dca1 1832 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1833 dev->ifindex, 1);
1da177e4 1834
2b5ead46 1835 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1836 /* Autoconf prefix route */
1837 if (valid_lft == 0) {
1838 ip6_del_rt(rt);
1839 rt = NULL;
4bed72e4 1840 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1841 /* not infinity */
1842 rt->rt6i_expires = jiffies + rt_expires;
1843 rt->rt6i_flags |= RTF_EXPIRES;
1844 } else {
1845 rt->rt6i_flags &= ~RTF_EXPIRES;
1846 rt->rt6i_expires = 0;
1da177e4
LT		 1847 }
1848 } else if (valid_lft) {
6f704992 1849 clock_t expires = 0;
4bed72e4
YH		 1850 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1851 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1852 /* not infinity */
1853 flags |= RTF_EXPIRES;
1854 expires = jiffies_to_clock_t(rt_expires);
1855 }
1da177e4 1856 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1857 dev, expires, flags);
1da177e4
LT		 1858 }
1859 if (rt)
1860 dst_release(&rt->u.dst);
1861 }
1862
1863 /* Try to figure out our local address for this prefix */
1864
1865 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1866 struct inet6_ifaddr * ifp;
1867 struct in6_addr addr;
1868 int create = 0, update_lft = 0;
53b7997f 1869 struct net *net = dev_net(dev);
1da177e4
LT		 1870
1871 if (pinfo->prefix_len == 64) {
1872 memcpy(&addr, &pinfo->prefix, 8);
1873 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1874 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1875 in6_dev_put(in6_dev);
1876 return;
1877 }
1878 goto ok;
1879 }
1880 if (net_ratelimit())
1881 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1882 pinfo->prefix_len);
1883 in6_dev_put(in6_dev);
1884 return;
1885
1886ok:
1887
53b7997f 1888 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1889
1890 if (ifp == NULL && valid_lft) {
1891 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1892 u32 addr_flags = 0;
1893
1894#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1895 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1896 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1897 addr_flags = IFA_F_OPTIMISTIC;
1898#endif
1da177e4
LT		 1899
1900 /* Do not allow to create too much of autoconfigured
1901 * addresses; this would be too easy way to crash kernel.
1902 */
1903 if (!max_addresses ||
1904 ipv6_count_addresses(in6_dev) < max_addresses)
1905 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1906 addr_type&IPV6_ADDR_SCOPE_MASK,
1907 addr_flags);
1da177e4
LT		 1908
1909 if (!ifp || IS_ERR(ifp)) {
1910 in6_dev_put(in6_dev);
1911 return;
1912 }
1913
1914 update_lft = create = 1;
1915 ifp->cstamp = jiffies;
1916 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1917 }
1918
1919 if (ifp) {
1920 int flags;
1921 unsigned long now;
1922#ifdef CONFIG_IPV6_PRIVACY
1923 struct inet6_ifaddr *ift;
1924#endif
1925 u32 stored_lft;
1926
1927 /* update lifetime (RFC2462 5.5.3 e) */
1928 spin_lock(&ifp->lock);
1929 now = jiffies;
1930 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1931 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1932 else
1933 stored_lft = 0;
1934 if (!update_lft && stored_lft) {
1935 if (valid_lft > MIN_VALID_LIFETIME ||
1936 valid_lft > stored_lft)
1937 update_lft = 1;
1938 else if (stored_lft <= MIN_VALID_LIFETIME) {
1939 /* valid_lft <= stored_lft is always true */
1940 /* XXX: IPsec */
1941 update_lft = 0;
1942 } else {
1943 valid_lft = MIN_VALID_LIFETIME;
1944 if (valid_lft < prefered_lft)
1945 prefered_lft = valid_lft;
1946 update_lft = 1;
1947 }
1948 }
1949
1950 if (update_lft) {
1951 ifp->valid_lft = valid_lft;
1952 ifp->prefered_lft = prefered_lft;
1953 ifp->tstamp = now;
1954 flags = ifp->flags;
1955 ifp->flags &= ~IFA_F_DEPRECATED;
1956 spin_unlock(&ifp->lock);
1957
1958 if (!(flags&IFA_F_TENTATIVE))
1959 ipv6_ifa_notify(0, ifp);
1960 } else
1961 spin_unlock(&ifp->lock);
1962
1963#ifdef CONFIG_IPV6_PRIVACY
1964 read_lock_bh(&in6_dev->lock);
1965 /* update all temporary addresses in the list */
1966 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1967 /*
1968 * When adjusting the lifetimes of an existing
1969 * temporary address, only lower the lifetimes.
1970 * Implementations must not increase the
1971 * lifetimes of an existing temporary address
1972 * when processing a Prefix Information Option.
1973 */
c6fbfac2
BB		 1974 if (ifp != ift->ifpub)
1975 continue;
1976
1da177e4
LT		 1977 spin_lock(&ift->lock);
1978 flags = ift->flags;
1979 if (ift->valid_lft > valid_lft &&
1980 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1981 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1982 if (ift->prefered_lft > prefered_lft &&
1983 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1985 spin_unlock(&ift->lock);
1986 if (!(flags&IFA_F_TENTATIVE))
1987 ipv6_ifa_notify(0, ift);
1988 }
1989
1990 if (create && in6_dev->cnf.use_tempaddr > 0) {
1991 /*
1992 * When a new public address is created as described in [ADDRCONF],
1993 * also create a new temporary address.
1994 */
1ab1457c 1995 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1996 ipv6_create_tempaddr(ifp, NULL);
1997 } else {
1998 read_unlock_bh(&in6_dev->lock);
1999 }
2000#endif
2001 in6_ifa_put(ifp);
2002 addrconf_verify(0);
2003 }
2004 }
2005 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2006 in6_dev_put(in6_dev);
2007}
2008
2009/*
2010 * Set destination address.
2011 * Special case for SIT interfaces where we create a new "virtual"
2012 * device.
2013 */
af284937 2014int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2015{
2016 struct in6_ifreq ireq;
2017 struct net_device *dev;
2018 int err = -EINVAL;
2019
2020 rtnl_lock();
2021
2022 err = -EFAULT;
2023 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024 goto err_exit;
2025
af284937 2026 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2027
2028 err = -ENODEV;
2029 if (dev == NULL)
2030 goto err_exit;
2031
0be669bb 2032#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2033 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2034 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2035 struct ifreq ifr;
1da177e4
LT		 2036 struct ip_tunnel_parm p;
2037
2038 err = -EADDRNOTAVAIL;
2039 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2040 goto err_exit;
2041
2042 memset(&p, 0, sizeof(p));
2043 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2044 p.iph.saddr = 0;
2045 p.iph.version = 4;
2046 p.iph.ihl = 5;
2047 p.iph.protocol = IPPROTO_IPV6;
2048 p.iph.ttl = 64;
d20b3109 2049 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2050
5bc3eb7e
SH		 2051 if (ops->ndo_do_ioctl) {
2052 mm_segment_t oldfs = get_fs();
2053
2054 set_fs(KERNEL_DS);
2055 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2056 set_fs(oldfs);
2057 } else
2058 err = -EOPNOTSUPP;
1da177e4
LT		 2059
2060 if (err == 0) {
2061 err = -ENOBUFS;
af284937
DL		 2062 dev = __dev_get_by_name(net, p.name);
2063 if (!dev)
1da177e4
LT		 2064 goto err_exit;
2065 err = dev_open(dev);
2066 }
2067 }
0be669bb 2068#endif
1da177e4
LT		 2069
2070err_exit:
2071 rtnl_unlock();
2072 return err;
2073}
2074
2075/*
2076 * Manual configuration of address on an interface
2077 */
af284937 2078static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2079 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2080 __u32 valid_lft)
1da177e4
LT		 2081{
2082 struct inet6_ifaddr *ifp;
2083 struct inet6_dev *idev;
2084 struct net_device *dev;
2085 int scope;
6f704992
YH		 2086 u32 flags;
2087 clock_t expires;
4bed72e4 2088 unsigned long timeout;
1da177e4
LT		 2089
2090 ASSERT_RTNL();
1ab1457c 2091
24ef0da7
TG		 2092 if (plen > 128)
2093 return -EINVAL;
2094
0778769d
NT		 2095 /* check the lifetime */
2096 if (!valid_lft || prefered_lft > valid_lft)
2097 return -EINVAL;
2098
af284937
DL		 2099 dev = __dev_get_by_index(net, ifindex);
2100 if (!dev)
1da177e4 2101 return -ENODEV;
1ab1457c 2102
1da177e4
LT		 2103 if ((idev = addrconf_add_dev(dev)) == NULL)
2104 return -ENOBUFS;
2105
2106 scope = ipv6_addr_scope(pfx);
2107
4bed72e4
YH		 2108 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2109 if (addrconf_finite_timeout(timeout)) {
2110 expires = jiffies_to_clock_t(timeout * HZ);
2111 valid_lft = timeout;
6f704992 2112 flags = RTF_EXPIRES;
4bed72e4
YH		 2113 } else {
2114 expires = 0;
2115 flags = 0;
2116 ifa_flags |= IFA_F_PERMANENT;
6f704992 2117 }
0778769d 2118
4bed72e4
YH		 2119 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2120 if (addrconf_finite_timeout(timeout)) {
2121 if (timeout == 0)
2122 ifa_flags |= IFA_F_DEPRECATED;
2123 prefered_lft = timeout;
2124 }
0778769d
NT		 2125
2126 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2127
1da177e4 2128 if (!IS_ERR(ifp)) {
06aebfb7 2129 spin_lock_bh(&ifp->lock);
0778769d
NT		 2130 ifp->valid_lft = valid_lft;
2131 ifp->prefered_lft = prefered_lft;
2132 ifp->tstamp = jiffies;
06aebfb7 2133 spin_unlock_bh(&ifp->lock);
0778769d 2134
46d48046 2135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2136 expires, flags);
95c385b4
NH		 2137 /*
2138 * Note that section 3.1 of RFC 4429 indicates
2139 * that the Optimistic flag should not be set for
2140 * manually configured addresses
2141 */
1da177e4
LT		 2142 addrconf_dad_start(ifp, 0);
2143 in6_ifa_put(ifp);
0778769d 2144 addrconf_verify(0);
1da177e4
LT		 2145 return 0;
2146 }
2147
2148 return PTR_ERR(ifp);
2149}
2150
af284937 2151static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2152 unsigned int plen)
1da177e4
LT		 2153{
2154 struct inet6_ifaddr *ifp;
2155 struct inet6_dev *idev;
2156 struct net_device *dev;
1ab1457c 2157
24ef0da7
TG		 2158 if (plen > 128)
2159 return -EINVAL;
2160
af284937
DL		 2161 dev = __dev_get_by_index(net, ifindex);
2162 if (!dev)
1da177e4
LT		 2163 return -ENODEV;
2164
2165 if ((idev = __in6_dev_get(dev)) == NULL)
2166 return -ENXIO;
2167
2168 read_lock_bh(&idev->lock);
2169 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2170 if (ifp->prefix_len == plen &&
2171 ipv6_addr_equal(pfx, &ifp->addr)) {
2172 in6_ifa_hold(ifp);
2173 read_unlock_bh(&idev->lock);
1ab1457c 2174
1da177e4
LT		 2175 ipv6_del_addr(ifp);
2176
2177 /* If the last address is deleted administratively,
2178 disable IPv6 on this interface.
2179 */
2180 if (idev->addr_list == NULL)
2181 addrconf_ifdown(idev->dev, 1);
2182 return 0;
2183 }
2184 }
2185 read_unlock_bh(&idev->lock);
2186 return -EADDRNOTAVAIL;
2187}
2188
2189
af284937 2190int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2191{
2192 struct in6_ifreq ireq;
2193 int err;
1ab1457c 2194
1da177e4
LT		 2195 if (!capable(CAP_NET_ADMIN))
2196 return -EPERM;
1ab1457c 2197
1da177e4
LT		 2198 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2199 return -EFAULT;
2200
2201 rtnl_lock();
af284937
DL		 2202 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2203 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2204 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2205 rtnl_unlock();
2206 return err;
2207}
2208
af284937 2209int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2210{
2211 struct in6_ifreq ireq;
2212 int err;
1ab1457c 2213
1da177e4
LT		 2214 if (!capable(CAP_NET_ADMIN))
2215 return -EPERM;
2216
2217 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2218 return -EFAULT;
2219
2220 rtnl_lock();
af284937
DL		 2221 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2222 ireq.ifr6_prefixlen);
1da177e4
LT		 2223 rtnl_unlock();
2224 return err;
2225}
2226
0be669bb 2227#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2228static void sit_add_v4_addrs(struct inet6_dev *idev)
2229{
2230 struct inet6_ifaddr * ifp;
2231 struct in6_addr addr;
2232 struct net_device *dev;
c346dca1 2233 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2234 int scope;
2235
2236 ASSERT_RTNL();
2237
2238 memset(&addr, 0, sizeof(struct in6_addr));
2239 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2240
2241 if (idev->dev->flags&IFF_POINTOPOINT) {
2242 addr.s6_addr32[0] = htonl(0xfe800000);
2243 scope = IFA_LINK;
2244 } else {
2245 scope = IPV6_ADDR_COMPATv4;
2246 }
2247
2248 if (addr.s6_addr32[3]) {
2249 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2250 if (!IS_ERR(ifp)) {
2251 spin_lock_bh(&ifp->lock);
2252 ifp->flags &= ~IFA_F_TENTATIVE;
2253 spin_unlock_bh(&ifp->lock);
2254 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2255 in6_ifa_put(ifp);
2256 }
2257 return;
2258 }
2259
6fda7350 2260 for_each_netdev(net, dev) {
e5ed6399 2261 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2262 if (in_dev && (dev->flags & IFF_UP)) {
2263 struct in_ifaddr * ifa;
2264
2265 int flag = scope;
2266
2267 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2268 int plen;
2269
2270 addr.s6_addr32[3] = ifa->ifa_local;
2271
2272 if (ifa->ifa_scope == RT_SCOPE_LINK)
2273 continue;
2274 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2275 if (idev->dev->flags&IFF_POINTOPOINT)
2276 continue;
2277 flag |= IFA_HOST;
2278 }
2279 if (idev->dev->flags&IFF_POINTOPOINT)
2280 plen = 64;
2281 else
2282 plen = 96;
2283
2284 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2285 IFA_F_PERMANENT);
2286 if (!IS_ERR(ifp)) {
2287 spin_lock_bh(&ifp->lock);
2288 ifp->flags &= ~IFA_F_TENTATIVE;
2289 spin_unlock_bh(&ifp->lock);
2290 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2291 in6_ifa_put(ifp);
2292 }
2293 }
2294 }
1ab1457c 2295 }
1da177e4 2296}
0be669bb 2297#endif
1da177e4
LT		 2298
2299static void init_loopback(struct net_device *dev)
2300{
2301 struct inet6_dev *idev;
2302 struct inet6_ifaddr * ifp;
2303
2304 /* ::1 */
2305
2306 ASSERT_RTNL();
2307
2308 if ((idev = ipv6_find_idev(dev)) == NULL) {
2309 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2310 return;
2311 }
2312
2313 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2314 if (!IS_ERR(ifp)) {
2315 spin_lock_bh(&ifp->lock);
2316 ifp->flags &= ~IFA_F_TENTATIVE;
2317 spin_unlock_bh(&ifp->lock);
2318 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2319 in6_ifa_put(ifp);
2320 }
2321}
2322
2323static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2324{
2325 struct inet6_ifaddr * ifp;
95c385b4
NH		 2326 u32 addr_flags = IFA_F_PERMANENT;
2327
2328#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2329 if (idev->cnf.optimistic_dad &&
702beb87 2330 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2331 addr_flags |= IFA_F_OPTIMISTIC;
2332#endif
1da177e4 2333
95c385b4
NH		 2334
2335 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2336 if (!IS_ERR(ifp)) {
46d48046 2337 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2338 addrconf_dad_start(ifp, 0);
2339 in6_ifa_put(ifp);
2340 }
2341}
2342
2343static void addrconf_dev_config(struct net_device *dev)
2344{
2345 struct in6_addr addr;
2346 struct inet6_dev * idev;
2347
2348 ASSERT_RTNL();
2349
74235a25
HX		 2350 if ((dev->type != ARPHRD_ETHER) &&
2351 (dev->type != ARPHRD_FDDI) &&
2352 (dev->type != ARPHRD_IEEE802_TR) &&
2353 (dev->type != ARPHRD_ARCNET) &&
2354 (dev->type != ARPHRD_INFINIBAND)) {
2355 /* Alas, we support only Ethernet autoconfiguration. */
2356 return;
2357 }
2358
1da177e4
LT		 2359 idev = addrconf_add_dev(dev);
2360 if (idev == NULL)
2361 return;
2362
2363 memset(&addr, 0, sizeof(struct in6_addr));
2364 addr.s6_addr32[0] = htonl(0xFE800000);
2365
2366 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2367 addrconf_add_linklocal(idev, &addr);
2368}
2369
0be669bb 2370#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2371static void addrconf_sit_config(struct net_device *dev)
2372{
2373 struct inet6_dev *idev;
2374
2375 ASSERT_RTNL();
2376
1ab1457c
YH		 2377 /*
2378 * Configure the tunnel with one of our IPv4
2379 * addresses... we should configure all of
1da177e4
LT		 2380 * our v4 addrs in the tunnel
2381 */
2382
2383 if ((idev = ipv6_find_idev(dev)) == NULL) {
2384 printk(KERN_DEBUG "init sit: add_dev failed\n");
2385 return;
2386 }
2387
c7dc89c0
FT		 2388 if (dev->priv_flags & IFF_ISATAP) {
2389 struct in6_addr addr;
2390
2391 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2392 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2393 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2394 addrconf_add_linklocal(idev, &addr);
2395 return;
2396 }
2397
1da177e4
LT		 2398 sit_add_v4_addrs(idev);
2399
2400 if (dev->flags&IFF_POINTOPOINT) {
2401 addrconf_add_mroute(dev);
2402 addrconf_add_lroute(dev);
2403 } else
2404 sit_route_add(dev);
2405}
0be669bb 2406#endif
1da177e4
LT		 2407
2408static inline int
2409ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2410{
2411 struct in6_addr lladdr;
2412
95c385b4 2413 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2414 addrconf_add_linklocal(idev, &lladdr);
2415 return 0;
2416 }
2417 return -1;
2418}
2419
2420static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2421{
2422 struct net_device *link_dev;
c346dca1 2423 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2424
2425 /* first try to inherit the link-local address from the link device */
2426 if (idev->dev->iflink &&
6fda7350 2427 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2428 if (!ipv6_inherit_linklocal(idev, link_dev))
2429 return;
2430 }
2431 /* then try to inherit it from any device */
6fda7350 2432 for_each_netdev(net, link_dev) {
1da177e4
LT		 2433 if (!ipv6_inherit_linklocal(idev, link_dev))
2434 return;
2435 }
2436 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2437}
2438
2439/*
2440 * Autoconfigure tunnel with a link-local address so routing protocols,
2441 * DHCPv6, MLD etc. can be run over the virtual link
2442 */
2443
2444static void addrconf_ip6_tnl_config(struct net_device *dev)
2445{
2446 struct inet6_dev *idev;
2447
2448 ASSERT_RTNL();
2449
2450 if ((idev = addrconf_add_dev(dev)) == NULL) {
2451 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2452 return;
2453 }
2454 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2455}
2456
1ab1457c 2457static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2458 void * data)
2459{
2460 struct net_device *dev = (struct net_device *) data;
74235a25 2461 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2462 int run_pending = 0;
b217d616 2463 int err;
1da177e4
LT		 2464
2465 switch(event) {
45ba9dd2 2466 case NETDEV_REGISTER:
74235a25 2467 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2468 idev = ipv6_add_dev(dev);
2469 if (!idev)
b217d616 2470 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2471 }
2472 break;
1da177e4 2473 case NETDEV_UP:
3c21edbd 2474 case NETDEV_CHANGE:
c2edacf8
JV		 2475 if (dev->flags & IFF_SLAVE)
2476 break;
2477
3c21edbd 2478 if (event == NETDEV_UP) {
f24e3d65 2479 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2480 /* device is not ready yet. */
2481 printk(KERN_INFO
2482 "ADDRCONF(NETDEV_UP): %s: "
2483 "link is not ready\n",
2484 dev->name);
2485 break;
2486 }
99081049 2487
d31c7b8f
EP		 2488 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2489 idev = ipv6_add_dev(dev);
2490
e3ec6cfc 2491 if (idev) {
99081049 2492 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2493 run_pending = 1;
2494 }
3c21edbd 2495 } else {
f24e3d65 2496 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2497 /* device is still not ready. */
2498 break;
2499 }
2500
2501 if (idev) {
2502 if (idev->if_flags & IF_READY) {
2503 /* device is already configured. */
2504 break;
2505 }
2506 idev->if_flags |= IF_READY;
2507 }
2508
2509 printk(KERN_INFO
2510 "ADDRCONF(NETDEV_CHANGE): %s: "
2511 "link becomes ready\n",
2512 dev->name);
2513
c5e33bdd 2514 run_pending = 1;
3c21edbd
YH		 2515 }
2516
1da177e4 2517 switch(dev->type) {
0be669bb 2518#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2519 case ARPHRD_SIT:
2520 addrconf_sit_config(dev);
2521 break;
0be669bb 2522#endif
1da177e4
LT		 2523 case ARPHRD_TUNNEL6:
2524 addrconf_ip6_tnl_config(dev);
2525 break;
2526 case ARPHRD_LOOPBACK:
2527 init_loopback(dev);
2528 break;
2529
2530 default:
2531 addrconf_dev_config(dev);
2532 break;
3ff50b79 2533 }
1da177e4 2534 if (idev) {
c5e33bdd
YH		 2535 if (run_pending)
2536 addrconf_dad_run(idev);
2537
1da177e4
LT		 2538 /* If the MTU changed during the interface down, when the
2539 interface up, the changed MTU must be reflected in the
2540 idev as well as routers.
2541 */
2542 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2543 rt6_mtu_change(dev, dev->mtu);
2544 idev->cnf.mtu6 = dev->mtu;
2545 }
2546 idev->tstamp = jiffies;
2547 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2548 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2549 stop IPv6 on this interface.
2550 */
2551 if (dev->mtu < IPV6_MIN_MTU)
2552 addrconf_ifdown(dev, event != NETDEV_DOWN);
2553 }
2554 break;
2555
2556 case NETDEV_CHANGEMTU:
d31c7b8f 2557 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2558 rt6_mtu_change(dev, dev->mtu);
2559 idev->cnf.mtu6 = dev->mtu;
2560 break;
2561 }
2562
d31c7b8f
EP		 2563 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2564 idev = ipv6_add_dev(dev);
2565 if (idev)
2566 break;
2567 }
2568
1da177e4
LT		 2569 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2570
2571 case NETDEV_DOWN:
2572 case NETDEV_UNREGISTER:
2573 /*
2574 * Remove all addresses from this interface.
2575 */
2576 addrconf_ifdown(dev, event != NETDEV_DOWN);
2577 break;
3c21edbd 2578
1da177e4 2579 case NETDEV_CHANGENAME:
1da177e4 2580 if (idev) {
5632c515 2581 snmp6_unregister_dev(idev);
408c4768 2582 addrconf_sysctl_unregister(idev);
f52295a9 2583 addrconf_sysctl_register(idev);
b217d616
HX		 2584 err = snmp6_register_dev(idev);
2585 if (err)
2586 return notifier_from_errno(err);
5632c515 2587 }
1da177e4 2588 break;
3ff50b79 2589 }
1da177e4
LT		 2590
2591 return NOTIFY_OK;
2592}
2593
2594/*
2595 * addrconf module should be notified of a device going up
2596 */
2597static struct notifier_block ipv6_dev_notf = {
2598 .notifier_call = addrconf_notify,
2599 .priority = 0
2600};
2601
2602static int addrconf_ifdown(struct net_device *dev, int how)
2603{
2604 struct inet6_dev *idev;
2605 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2606 struct net *net = dev_net(dev);
1da177e4
LT		 2607 int i;
2608
2609 ASSERT_RTNL();
2610
eb867579 2611 if ((dev->flags & IFF_LOOPBACK) && how == 1)
1da177e4
LT		 2612 how = 0;
2613
f3db4851 2614 rt6_ifdown(net, dev);
1da177e4
LT		 2615 neigh_ifdown(&nd_tbl, dev);
2616
2617 idev = __in6_dev_get(dev);
2618 if (idev == NULL)
2619 return -ENODEV;
2620
2621 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2622 Do not dev_put!
1da177e4 2623 */
439e2385 2624 if (how) {
1da177e4 2625 idev->dead = 1;
8814c4b5
YH		 2626
2627 /* protected by rtnl_lock */
2628 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2629
2630 /* Step 1.5: remove snmp6 entry */
2631 snmp6_unregister_dev(idev);
2632
2633 }
2634
2635 /* Step 2: clear hash table */
2636 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2637 bifa = &inet6_addr_lst[i];
2638
2639 write_lock_bh(&addrconf_hash_lock);
2640 while ((ifa = *bifa) != NULL) {
2641 if (ifa->idev == idev) {
2642 *bifa = ifa->lst_next;
2643 ifa->lst_next = NULL;
2644 addrconf_del_timer(ifa);
2645 in6_ifa_put(ifa);
2646 continue;
2647 }
2648 bifa = &ifa->lst_next;
2649 }
2650 write_unlock_bh(&addrconf_hash_lock);
2651 }
2652
2653 write_lock_bh(&idev->lock);
2654
2655 /* Step 3: clear flags for stateless addrconf */
439e2385 2656 if (!how)
3c21edbd 2657 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2658
2659 /* Step 4: clear address list */
2660#ifdef CONFIG_IPV6_PRIVACY
439e2385 2661 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2662 in6_dev_put(idev);
2663
2664 /* clear tempaddr list */
2665 while ((ifa = idev->tempaddr_list) != NULL) {
2666 idev->tempaddr_list = ifa->tmp_next;
2667 ifa->tmp_next = NULL;
2668 ifa->dead = 1;
2669 write_unlock_bh(&idev->lock);
2670 spin_lock_bh(&ifa->lock);
2671
2672 if (ifa->ifpub) {
2673 in6_ifa_put(ifa->ifpub);
2674 ifa->ifpub = NULL;
2675 }
2676 spin_unlock_bh(&ifa->lock);
2677 in6_ifa_put(ifa);
2678 write_lock_bh(&idev->lock);
2679 }
2680#endif
2681 while ((ifa = idev->addr_list) != NULL) {
2682 idev->addr_list = ifa->if_next;
2683 ifa->if_next = NULL;
2684 ifa->dead = 1;
2685 addrconf_del_timer(ifa);
2686 write_unlock_bh(&idev->lock);
2687
2688 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2689 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2690 in6_ifa_put(ifa);
2691
2692 write_lock_bh(&idev->lock);
2693 }
2694 write_unlock_bh(&idev->lock);
2695
2696 /* Step 5: Discard multicast list */
2697
439e2385 2698 if (how)
1da177e4
LT		 2699 ipv6_mc_destroy_dev(idev);
2700 else
2701 ipv6_mc_down(idev);
2702
1da177e4 2703 idev->tstamp = jiffies;
1ab1457c 2704
1da177e4
LT		 2705 /* Shot the device (if unregistered) */
2706
439e2385 2707 if (how) {
408c4768 2708 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2709 neigh_parms_release(&nd_tbl, idev->nd_parms);
2710 neigh_ifdown(&nd_tbl, dev);
2711 in6_dev_put(idev);
2712 }
2713 return 0;
2714}
2715
2716static void addrconf_rs_timer(unsigned long data)
2717{
2718 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2719
2720 if (ifp->idev->cnf.forwarding)
2721 goto out;
2722
2723 if (ifp->idev->if_flags & IF_RA_RCVD) {
2724 /*
2725 * Announcement received after solicitation
2726 * was sent
2727 */
2728 goto out;
2729 }
2730
2731 spin_lock(&ifp->lock);
2732 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
1da177e4
LT		 2733 /* The wait after the last probe can be shorter */
2734 addrconf_mod_timer(ifp, AC_RS,
2735 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2736 ifp->idev->cnf.rtr_solicit_delay :
2737 ifp->idev->cnf.rtr_solicit_interval);
2738 spin_unlock(&ifp->lock);
2739
f3ee4010 2740 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2741 } else {
2742 spin_unlock(&ifp->lock);
2743 /*
2744 * Note: we do not support deprecated "all on-link"
2745 * assumption any longer.
2746 */
2747 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2748 ifp->idev->dev->name);
2749 }
2750
2751out:
2752 in6_ifa_put(ifp);
2753}
2754
2755/*
2756 * Duplicate Address Detection
2757 */
3c21edbd
YH		 2758static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2759{
2760 unsigned long rand_num;
2761 struct inet6_dev *idev = ifp->idev;
2762
95c385b4
NH		 2763 if (ifp->flags & IFA_F_OPTIMISTIC)
2764 rand_num = 0;
2765 else
2766 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2767
3c21edbd
YH		 2768 ifp->probes = idev->cnf.dad_transmits;
2769 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2770}
2771
e431b8c0 2772static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2773{
2774 struct inet6_dev *idev = ifp->idev;
2775 struct net_device *dev = idev->dev;
1da177e4
LT		 2776
2777 addrconf_join_solict(dev, &ifp->addr);
2778
1da177e4 2779 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2780
2781 read_lock_bh(&idev->lock);
2782 if (ifp->dead)
2783 goto out;
2784 spin_lock_bh(&ifp->lock);
2785
2786 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2787 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2788 !(ifp->flags&IFA_F_TENTATIVE) ||
2789 ifp->flags & IFA_F_NODAD) {
95c385b4 2790 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2791 spin_unlock_bh(&ifp->lock);
2792 read_unlock_bh(&idev->lock);
2793
2794 addrconf_dad_completed(ifp);
2795 return;
2796 }
2797
6732bade 2798 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2799 spin_unlock_bh(&ifp->lock);
6732bade 2800 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2801 /*
2802 * If the defice is not ready:
2803 * - keep it tentative if it is a permanent address.
2804 * - otherwise, kill it.
2805 */
2806 in6_ifa_hold(ifp);
2807 addrconf_dad_stop(ifp);
6732bade 2808 return;
3c21edbd 2809 }
95c385b4
NH		 2810
2811 /*
2812 * Optimistic nodes can start receiving
2813 * Frames right away
2814 */
2815 if(ifp->flags & IFA_F_OPTIMISTIC)
2816 ip6_ins_rt(ifp->rt);
2817
6732bade
YH		 2818 addrconf_dad_kick(ifp);
2819 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2820out:
2821 read_unlock_bh(&idev->lock);
2822}
2823
2824static void addrconf_dad_timer(unsigned long data)
2825{
2826 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2827 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2828 struct in6_addr mcaddr;
2829
2830 read_lock_bh(&idev->lock);
2831 if (idev->dead) {
2832 read_unlock_bh(&idev->lock);
2833 goto out;
2834 }
1b34be74
YH		 2835 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2836 read_unlock_bh(&idev->lock);
2837 addrconf_dad_failure(ifp);
2838 return;
2839 }
1da177e4
LT		 2840 spin_lock_bh(&ifp->lock);
2841 if (ifp->probes == 0) {
2842 /*
2843 * DAD was successful
2844 */
2845
95c385b4 2846 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2847 spin_unlock_bh(&ifp->lock);
2848 read_unlock_bh(&idev->lock);
2849
2850 addrconf_dad_completed(ifp);
2851
2852 goto out;
2853 }
2854
2855 ifp->probes--;
2856 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2857 spin_unlock_bh(&ifp->lock);
2858 read_unlock_bh(&idev->lock);
2859
2860 /* send a neighbour solicitation for our addr */
1da177e4 2861 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2862 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2863out:
2864 in6_ifa_put(ifp);
2865}
2866
2867static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2868{
2869 struct net_device * dev = ifp->idev->dev;
2870
2871 /*
2872 * Configure the address for reception. Now it is valid.
2873 */
2874
2875 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2876
2877 /* If added prefix is link local and forwarding is off,
2878 start sending router solicitations.
2879 */
2880
2881 if (ifp->idev->cnf.forwarding == 0 &&
2882 ifp->idev->cnf.rtr_solicits > 0 &&
2883 (dev->flags&IFF_LOOPBACK) == 0 &&
2884 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2885 /*
2886 * If a host as already performed a random delay
2887 * [...] as part of DAD [...] there is no need
2888 * to delay again before sending the first RS
2889 */
f3ee4010 2890 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2891
2892 spin_lock_bh(&ifp->lock);
2893 ifp->probes = 1;
2894 ifp->idev->if_flags |= IF_RS_SENT;
2895 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2896 spin_unlock_bh(&ifp->lock);
2897 }
2898}
2899
c5e33bdd
YH		 2900static void addrconf_dad_run(struct inet6_dev *idev) {
2901 struct inet6_ifaddr *ifp;
2902
2903 read_lock_bh(&idev->lock);
2904 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2905 spin_lock_bh(&ifp->lock);
2906 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2907 spin_unlock_bh(&ifp->lock);
2908 continue;
2909 }
2910 spin_unlock_bh(&ifp->lock);
2911 addrconf_dad_kick(ifp);
2912 }
2913 read_unlock_bh(&idev->lock);
2914}
2915
1da177e4
LT		 2916#ifdef CONFIG_PROC_FS
2917struct if6_iter_state {
3c40090a 2918 struct seq_net_private p;
1da177e4
LT		 2919 int bucket;
2920};
2921
2922static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2923{
2924 struct inet6_ifaddr *ifa = NULL;
2925 struct if6_iter_state *state = seq->private;
1218854a 2926 struct net *net = seq_file_net(seq);
1da177e4
LT		 2927
2928 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2929 ifa = inet6_addr_lst[state->bucket];
3c40090a 2930
878628fb 2931 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2932 ifa = ifa->lst_next;
1da177e4
LT		 2933 if (ifa)
2934 break;
2935 }
2936 return ifa;
2937}
2938
2939static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2940{
2941 struct if6_iter_state *state = seq->private;
1218854a 2942 struct net *net = seq_file_net(seq);
1da177e4
LT		 2943
2944 ifa = ifa->lst_next;
2945try_again:
3c40090a 2946 if (ifa) {
878628fb 2947 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2948 ifa = ifa->lst_next;
2949 goto try_again;
2950 }
2951 }
2952
1da177e4
LT		 2953 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2954 ifa = inet6_addr_lst[state->bucket];
2955 goto try_again;
2956 }
3c40090a 2957
1da177e4
LT		 2958 return ifa;
2959}
2960
2961static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2962{
2963 struct inet6_ifaddr *ifa = if6_get_first(seq);
2964
2965 if (ifa)
2966 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2967 --pos;
2968 return pos ? NULL : ifa;
2969}
2970
2971static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2972 __acquires(addrconf_hash_lock)
1da177e4
LT		 2973{
2974 read_lock_bh(&addrconf_hash_lock);
2975 return if6_get_idx(seq, *pos);
2976}
2977
2978static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2979{
2980 struct inet6_ifaddr *ifa;
2981
2982 ifa = if6_get_next(seq, v);
2983 ++*pos;
2984 return ifa;
2985}
2986
2987static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2988 __releases(addrconf_hash_lock)
1da177e4
LT		 2989{
2990 read_unlock_bh(&addrconf_hash_lock);
2991}
2992
2993static int if6_seq_show(struct seq_file *seq, void *v)
2994{
2995 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 2996 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 2997 &ifp->addr,
1da177e4
LT		 2998 ifp->idev->dev->ifindex,
2999 ifp->prefix_len,
3000 ifp->scope,
3001 ifp->flags,
3002 ifp->idev->dev->name);
3003 return 0;
3004}
3005
56b3d975 3006static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3007 .start = if6_seq_start,
3008 .next = if6_seq_next,
3009 .show = if6_seq_show,
3010 .stop = if6_seq_stop,
3011};
3012
3013static int if6_seq_open(struct inode *inode, struct file *file)
3014{
3c40090a
DL		 3015 return seq_open_net(inode, file, &if6_seq_ops,
3016 sizeof(struct if6_iter_state));
1da177e4
LT		 3017}
3018
9a32144e 3019static const struct file_operations if6_fops = {
1da177e4
LT		 3020 .owner = THIS_MODULE,
3021 .open = if6_seq_open,
3022 .read = seq_read,
3023 .llseek = seq_lseek,
3c40090a 3024 .release = seq_release_net,
1da177e4
LT		 3025};
3026
3c40090a 3027static int if6_proc_net_init(struct net *net)
1da177e4 3028{
3c40090a 3029 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3030 return -ENOMEM;
3031 return 0;
3032}
3033
3c40090a
DL		 3034static void if6_proc_net_exit(struct net *net)
3035{
3036 proc_net_remove(net, "if_inet6");
3037}
3038
3039static struct pernet_operations if6_proc_net_ops = {
3040 .init = if6_proc_net_init,
3041 .exit = if6_proc_net_exit,
3042};
3043
3044int __init if6_proc_init(void)
3045{
3046 return register_pernet_subsys(&if6_proc_net_ops);
3047}
3048
1da177e4
LT		 3049void if6_proc_exit(void)
3050{
3c40090a 3051 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3052}
3053#endif /* CONFIG_PROC_FS */
3054
59fbb3a6 3055#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3056/* Check if address is a home address configured on any interface. */
389f6612 3057int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3058{
3059 int ret = 0;
3060 struct inet6_ifaddr * ifp;
3061 u8 hash = ipv6_addr_hash(addr);
3062 read_lock_bh(&addrconf_hash_lock);
3063 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3064 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3065 continue;
caad295f 3066 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3067 (ifp->flags & IFA_F_HOMEADDRESS)) {
3068 ret = 1;
3069 break;
3070 }
3071 }
3072 read_unlock_bh(&addrconf_hash_lock);
3073 return ret;
3074}
3075#endif
3076
1da177e4
LT		 3077/*
3078 * Periodic address status verification
3079 */
3080
3081static void addrconf_verify(unsigned long foo)
3082{
3083 struct inet6_ifaddr *ifp;
3084 unsigned long now, next;
3085 int i;
3086
3087 spin_lock_bh(&addrconf_verify_lock);
3088 now = jiffies;
3089 next = now + ADDR_CHECK_FREQUENCY;
3090
3091 del_timer(&addr_chk_timer);
3092
3093 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3094
3095restart:
5d5780df 3096 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3097 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3098 unsigned long age;
3099#ifdef CONFIG_IPV6_PRIVACY
3100 unsigned long regen_advance;
3101#endif
3102
3103 if (ifp->flags & IFA_F_PERMANENT)
3104 continue;
3105
3106 spin_lock(&ifp->lock);
3107 age = (now - ifp->tstamp) / HZ;
3108
3109#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3110 regen_advance = ifp->idev->cnf.regen_max_retry *
3111 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3112 ifp->idev->nd_parms->retrans_time / HZ;
3113#endif
3114
8f27ebb9
YH		 3115 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3116 age >= ifp->valid_lft) {
1da177e4
LT		 3117 spin_unlock(&ifp->lock);
3118 in6_ifa_hold(ifp);
5d5780df 3119 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3120 ipv6_del_addr(ifp);
3121 goto restart;
8f27ebb9
YH		 3122 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3123 spin_unlock(&ifp->lock);
3124 continue;
1da177e4
LT		 3125 } else if (age >= ifp->prefered_lft) {
3126 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3127 int deprecate = 0;
3128
3129 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3130 deprecate = 1;
3131 ifp->flags |= IFA_F_DEPRECATED;
3132 }
3133
3134 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3135 next = ifp->tstamp + ifp->valid_lft * HZ;
3136
3137 spin_unlock(&ifp->lock);
3138
3139 if (deprecate) {
3140 in6_ifa_hold(ifp);
5d5780df 3141 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3142
3143 ipv6_ifa_notify(0, ifp);
3144 in6_ifa_put(ifp);
3145 goto restart;
3146 }
3147#ifdef CONFIG_IPV6_PRIVACY
3148 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3149 !(ifp->flags&IFA_F_TENTATIVE)) {
3150 if (age >= ifp->prefered_lft - regen_advance) {
3151 struct inet6_ifaddr *ifpub = ifp->ifpub;
3152 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3153 next = ifp->tstamp + ifp->prefered_lft * HZ;
3154 if (!ifp->regen_count && ifpub) {
3155 ifp->regen_count++;
3156 in6_ifa_hold(ifp);
3157 in6_ifa_hold(ifpub);
3158 spin_unlock(&ifp->lock);
5d5780df 3159 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3160 spin_lock(&ifpub->lock);
3161 ifpub->regen_count = 0;
3162 spin_unlock(&ifpub->lock);
1da177e4
LT		 3163 ipv6_create_tempaddr(ifpub, ifp);
3164 in6_ifa_put(ifpub);
3165 in6_ifa_put(ifp);
3166 goto restart;
3167 }
3168 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3169 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3170 spin_unlock(&ifp->lock);
3171#endif
3172 } else {
3173 /* ifp->prefered_lft <= ifp->valid_lft */
3174 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3175 next = ifp->tstamp + ifp->prefered_lft * HZ;
3176 spin_unlock(&ifp->lock);
3177 }
3178 }
5d5780df 3179 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3180 }
3181
3182 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3183 add_timer(&addr_chk_timer);
3184 spin_unlock_bh(&addrconf_verify_lock);
3185}
3186
461d8837
TG		 3187static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3188{
3189 struct in6_addr *pfx = NULL;
3190
3191 if (addr)
3192 pfx = nla_data(addr);
3193
3194 if (local) {
3195 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3196 pfx = NULL;
3197 else
3198 pfx = nla_data(local);
3199 }
3200
3201 return pfx;
3202}
3203
ef7c79ed 3204static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3205 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3206 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3207 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3208};
3209
1da177e4
LT		 3210static int
3211inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3212{
3b1e0a65 3213 struct net *net = sock_net(skb->sk);
b933f716
TG		 3214 struct ifaddrmsg *ifm;
3215 struct nlattr *tb[IFA_MAX+1];
1da177e4 3216 struct in6_addr *pfx;
b933f716 3217 int err;
1da177e4 3218
b933f716
TG		 3219 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3220 if (err < 0)
3221 return err;
3222
3223 ifm = nlmsg_data(nlh);
3224 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3225 if (pfx == NULL)
3226 return -EINVAL;
3227
af284937 3228 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3229}
3230
55ebaef1
NT		 3231static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3232 u32 prefered_lft, u32 valid_lft)
081bba5b 3233{
6f704992
YH		 3234 u32 flags;
3235 clock_t expires;
4bed72e4 3236 unsigned long timeout;
46d48046 3237
081bba5b
NT		 3238 if (!valid_lft || (prefered_lft > valid_lft))
3239 return -EINVAL;
3240
4bed72e4
YH		 3241 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3242 if (addrconf_finite_timeout(timeout)) {
3243 expires = jiffies_to_clock_t(timeout * HZ);
3244 valid_lft = timeout;
6f704992 3245 flags = RTF_EXPIRES;
4bed72e4
YH		 3246 } else {
3247 expires = 0;
3248 flags = 0;
3249 ifa_flags |= IFA_F_PERMANENT;
6f704992 3250 }
081bba5b 3251
4bed72e4
YH		 3252 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3253 if (addrconf_finite_timeout(timeout)) {
3254 if (timeout == 0)
3255 ifa_flags |= IFA_F_DEPRECATED;
3256 prefered_lft = timeout;
3257 }
081bba5b
NT		 3258
3259 spin_lock_bh(&ifp->lock);
3b9f9a1c 3260 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3261 ifp->tstamp = jiffies;
3262 ifp->valid_lft = valid_lft;
3263 ifp->prefered_lft = prefered_lft;
3264
3265 spin_unlock_bh(&ifp->lock);
3266 if (!(ifp->flags&IFA_F_TENTATIVE))
3267 ipv6_ifa_notify(0, ifp);
081bba5b 3268
46d48046 3269 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3270 expires, flags);
081bba5b
NT		 3271 addrconf_verify(0);
3272
3273 return 0;
3274}
3275
1da177e4
LT		 3276static int
3277inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3278{
3b1e0a65 3279 struct net *net = sock_net(skb->sk);
461d8837
TG		 3280 struct ifaddrmsg *ifm;
3281 struct nlattr *tb[IFA_MAX+1];
1da177e4 3282 struct in6_addr *pfx;
7198f8ce
TG		 3283 struct inet6_ifaddr *ifa;
3284 struct net_device *dev;
55ebaef1
NT		 3285 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3286 u8 ifa_flags;
461d8837 3287 int err;
1da177e4 3288
461d8837
TG		 3289 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3290 if (err < 0)
3291 return err;
3292
3293 ifm = nlmsg_data(nlh);
3294 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3295 if (pfx == NULL)
3296 return -EINVAL;
3297
461d8837 3298 if (tb[IFA_CACHEINFO]) {
0778769d 3299 struct ifa_cacheinfo *ci;
461d8837
TG		 3300
3301 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3302 valid_lft = ci->ifa_valid;
461d8837
TG		 3303 preferred_lft = ci->ifa_prefered;
3304 } else {
3305 preferred_lft = INFINITY_LIFE_TIME;
3306 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3307 }
3308
af284937 3309 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3310 if (dev == NULL)
3311 return -ENODEV;
3312
55ebaef1 3313 /* We ignore other flags so far. */
3b9f9a1c 3314 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3315
1cab3da6 3316 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3317 if (ifa == NULL) {
3318 /*
3319 * It would be best to check for !NLM_F_CREATE here but
3320 * userspace alreay relies on not having to provide this.
3321 */
af284937
DL		 3322 return inet6_addr_add(net, ifm->ifa_index, pfx,
3323 ifm->ifa_prefixlen, ifa_flags,
3324 preferred_lft, valid_lft);
081bba5b
NT		 3325 }
3326
7198f8ce
TG		 3327 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3328 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3329 err = -EEXIST;
3330 else
55ebaef1 3331 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3332
3333 in6_ifa_put(ifa);
3334
3335 return err;
1da177e4
LT		 3336}
3337
101bb229
TG		 3338static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3339 u8 scope, int ifindex)
3340{
3341 struct ifaddrmsg *ifm;
3342
3343 ifm = nlmsg_data(nlh);
3344 ifm->ifa_family = AF_INET6;
3345 ifm->ifa_prefixlen = prefixlen;
3346 ifm->ifa_flags = flags;
3347 ifm->ifa_scope = scope;
3348 ifm->ifa_index = ifindex;
3349}
3350
85486af0
TG		 3351static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3352 unsigned long tstamp, u32 preferred, u32 valid)
3353{
3354 struct ifa_cacheinfo ci;
3355
3356 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3357 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3358 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3359 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3360 ci.ifa_prefered = preferred;
3361 ci.ifa_valid = valid;
3362
3363 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3364}
3365
101bb229
TG		 3366static inline int rt_scope(int ifa_scope)
3367{
3368 if (ifa_scope & IFA_HOST)
3369 return RT_SCOPE_HOST;
3370 else if (ifa_scope & IFA_LINK)
3371 return RT_SCOPE_LINK;
3372 else if (ifa_scope & IFA_SITE)
3373 return RT_SCOPE_SITE;
3374 else
3375 return RT_SCOPE_UNIVERSE;
3376}
3377
0ab6803b
TG		 3378static inline int inet6_ifaddr_msgsize(void)
3379{
339bf98f
TG		 3380 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3381 + nla_total_size(16) /* IFA_ADDRESS */
3382 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3383}
c5396a31 3384
1da177e4 3385static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3386 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3387{
1da177e4 3388 struct nlmsghdr *nlh;
85486af0 3389 u32 preferred, valid;
1da177e4 3390
0ab6803b
TG		 3391 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3392 if (nlh == NULL)
26932566 3393 return -EMSGSIZE;
0ab6803b 3394
101bb229
TG		 3395 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3396 ifa->idev->dev->ifindex);
3397
1da177e4 3398 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3399 preferred = ifa->prefered_lft;
3400 valid = ifa->valid_lft;
3401 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3402 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3403 preferred -= tval;
3404 if (valid != INFINITY_LIFE_TIME)
3405 valid -= tval;
1da177e4
LT		 3406 }
3407 } else {
85486af0
TG		 3408 preferred = INFINITY_LIFE_TIME;
3409 valid = INFINITY_LIFE_TIME;
3410 }
3411
0ab6803b 3412 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3413 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3414 nlmsg_cancel(skb, nlh);
3415 return -EMSGSIZE;
3416 }
1da177e4 3417
0ab6803b 3418 return nlmsg_end(skb, nlh);
1da177e4
LT		 3419}
3420
3421static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3422 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3423{
1da177e4 3424 struct nlmsghdr *nlh;
101bb229
TG		 3425 u8 scope = RT_SCOPE_UNIVERSE;
3426 int ifindex = ifmca->idev->dev->ifindex;
3427
3428 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3429 scope = RT_SCOPE_SITE;
1da177e4 3430
0ab6803b
TG		 3431 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3432 if (nlh == NULL)
26932566 3433 return -EMSGSIZE;
85486af0 3434
0ab6803b
TG		 3435 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3436 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3437 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3438 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3439 nlmsg_cancel(skb, nlh);
3440 return -EMSGSIZE;
3441 }
85486af0 3442
0ab6803b 3443 return nlmsg_end(skb, nlh);
1da177e4
LT		 3444}
3445
3446static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3447 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3448{
1da177e4 3449 struct nlmsghdr *nlh;
101bb229
TG		 3450 u8 scope = RT_SCOPE_UNIVERSE;
3451 int ifindex = ifaca->aca_idev->dev->ifindex;
3452
3453 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3454 scope = RT_SCOPE_SITE;
1da177e4 3455
0ab6803b
TG		 3456 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3457 if (nlh == NULL)
26932566 3458 return -EMSGSIZE;
85486af0 3459
0ab6803b
TG		 3460 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3461 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3462 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3463 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3464 nlmsg_cancel(skb, nlh);
3465 return -EMSGSIZE;
3466 }
1da177e4 3467
0ab6803b 3468 return nlmsg_end(skb, nlh);
1da177e4
LT		 3469}
3470
3471enum addr_type_t
3472{
3473 UNICAST_ADDR,
3474 MULTICAST_ADDR,
3475 ANYCAST_ADDR,
3476};
3477
3478static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3479 enum addr_type_t type)
3480{
3481 int idx, ip_idx;
3482 int s_idx, s_ip_idx;
3483 int err = 1;
3484 struct net_device *dev;
3485 struct inet6_dev *idev = NULL;
3486 struct inet6_ifaddr *ifa;
3487 struct ifmcaddr6 *ifmca;
3488 struct ifacaddr6 *ifaca;
3b1e0a65 3489 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3490
3491 s_idx = cb->args[0];
3492 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3493
7562f876 3494 idx = 0;
6fda7350 3495 for_each_netdev(net, dev) {
1da177e4 3496 if (idx < s_idx)
7562f876 3497 goto cont;
1da177e4
LT		 3498 if (idx > s_idx)
3499 s_ip_idx = 0;
3500 ip_idx = 0;
3501 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3502 goto cont;
1da177e4
LT		 3503 read_lock_bh(&idev->lock);
3504 switch (type) {
3505 case UNICAST_ADDR:
ae9cda5d 3506 /* unicast address incl. temp addr */
1da177e4
LT		 3507 for (ifa = idev->addr_list; ifa;
3508 ifa = ifa->if_next, ip_idx++) {
3509 if (ip_idx < s_ip_idx)
3510 continue;
5d5619b4
YH		 3511 err = inet6_fill_ifaddr(skb, ifa,
3512 NETLINK_CB(cb->skb).pid,
3513 cb->nlh->nlmsg_seq,
3514 RTM_NEWADDR,
3515 NLM_F_MULTI);
1da177e4 3516 }
1da177e4
LT		 3517 break;
3518 case MULTICAST_ADDR:
3519 /* multicast address */
1ab1457c 3520 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3521 ifmca = ifmca->next, ip_idx++) {
3522 if (ip_idx < s_ip_idx)
3523 continue;
5d5619b4
YH		 3524 err = inet6_fill_ifmcaddr(skb, ifmca,
3525 NETLINK_CB(cb->skb).pid,
3526 cb->nlh->nlmsg_seq,
3527 RTM_GETMULTICAST,
3528 NLM_F_MULTI);
1da177e4
LT		 3529 }
3530 break;
3531 case ANYCAST_ADDR:
3532 /* anycast address */
3533 for (ifaca = idev->ac_list; ifaca;
3534 ifaca = ifaca->aca_next, ip_idx++) {
3535 if (ip_idx < s_ip_idx)
3536 continue;
5d5619b4
YH		 3537 err = inet6_fill_ifacaddr(skb, ifaca,
3538 NETLINK_CB(cb->skb).pid,
3539 cb->nlh->nlmsg_seq,
3540 RTM_GETANYCAST,
3541 NLM_F_MULTI);
1da177e4
LT		 3542 }
3543 break;
3544 default:
3545 break;
3546 }
3547 read_unlock_bh(&idev->lock);
3548 in6_dev_put(idev);
5d5619b4
YH		 3549
3550 if (err <= 0)
3551 break;
7562f876
PE		 3552cont:
3553 idx++;
1da177e4 3554 }
1da177e4
LT		 3555 cb->args[0] = idx;
3556 cb->args[1] = ip_idx;
3557 return skb->len;
3558}
3559
3560static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3561{
3562 enum addr_type_t type = UNICAST_ADDR;
b854272b 3563
1da177e4
LT		 3564 return inet6_dump_addr(skb, cb, type);
3565}
3566
3567static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3568{
3569 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3570
1da177e4
LT		 3571 return inet6_dump_addr(skb, cb, type);
3572}
3573
3574
3575static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3576{
3577 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3578
1da177e4
LT		 3579 return inet6_dump_addr(skb, cb, type);
3580}
3581
1b29fc2c
TG		 3582static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3583 void *arg)
6c223828 3584{
3b1e0a65 3585 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3586 struct ifaddrmsg *ifm;
3587 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3588 struct in6_addr *addr = NULL;
3589 struct net_device *dev = NULL;
3590 struct inet6_ifaddr *ifa;
3591 struct sk_buff *skb;
6c223828
NT		 3592 int err;
3593
1b29fc2c
TG		 3594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3595 if (err < 0)
3596 goto errout;
3597
3598 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3599 if (addr == NULL) {
3600 err = -EINVAL;
3601 goto errout;
6c223828 3602 }
6c223828 3603
1b29fc2c 3604 ifm = nlmsg_data(nlh);
6c223828 3605 if (ifm->ifa_index)
6fda7350 3606 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3607
1cab3da6 3608 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3609 err = -EADDRNOTAVAIL;
3610 goto errout;
3611 }
6c223828 3612
0ab6803b 3613 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3614 err = -ENOBUFS;
1b29fc2c 3615 goto errout_ifa;
6c223828
NT		 3616 }
3617
6c223828
NT		 3618 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3619 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3620 if (err < 0) {
3621 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3622 WARN_ON(err == -EMSGSIZE);
3623 kfree_skb(skb);
3624 goto errout_ifa;
3625 }
6fda7350 3626 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3627errout_ifa:
6c223828 3628 in6_ifa_put(ifa);
1b29fc2c 3629errout:
6c223828 3630 return err;
6c223828
NT		 3631}
3632
1da177e4
LT		 3633static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3634{
3635 struct sk_buff *skb;
c346dca1 3636 struct net *net = dev_net(ifa->idev->dev);
5d620266 3637 int err = -ENOBUFS;
1da177e4 3638
0ab6803b 3639 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3640 if (skb == NULL)
3641 goto errout;
3642
3643 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3644 if (err < 0) {
3645 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3646 WARN_ON(err == -EMSGSIZE);
3647 kfree_skb(skb);
3648 goto errout;
3649 }
6fda7350 3650 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3651errout:
3652 if (err < 0)
6fda7350 3653 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3654}
3655
b6f99a21 3656static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3657 __s32 *array, int bytes)
3658{
04561c1f
TG		 3659 BUG_ON(bytes < (DEVCONF_MAX * 4));
3660
1da177e4
LT		 3661 memset(array, 0, bytes);
3662 array[DEVCONF_FORWARDING] = cnf->forwarding;
3663 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3664 array[DEVCONF_MTU6] = cnf->mtu6;
3665 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3666 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3667 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3668 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3669 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3670 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3671 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3672 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3673#ifdef CONFIG_IPV6_PRIVACY
3674 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3675 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3676 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3677 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3678 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3679#endif
3680 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3681 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3682 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3683#ifdef CONFIG_IPV6_ROUTER_PREF
3684 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3685 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3686#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3687 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3688#endif
930d6ff2 3689#endif
fbea49e1 3690 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3691 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3692#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3693 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3694#endif
7bc570c8
YH		 3695#ifdef CONFIG_IPV6_MROUTE
3696 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3697#endif
778d80be 3698 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3699 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
1da177e4
LT		 3700}
3701
339bf98f
TG		 3702static inline size_t inet6_if_nlmsg_size(void)
3703{
3704 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3705 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3706 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3707 + nla_total_size(4) /* IFLA_MTU */
3708 + nla_total_size(4) /* IFLA_LINK */
3709 + nla_total_size( /* IFLA_PROTINFO */
3710 nla_total_size(4) /* IFLA_INET6_FLAGS */
3711 + nla_total_size(sizeof(struct ifla_cacheinfo))
3712 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3713 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3714 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3715 );
3716}
c5396a31 3717
7f7d9a6b
HX		 3718static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3719 int bytes)
3720{
3721 int i;
3722 int pad = bytes - sizeof(u64) * items;
3723 BUG_ON(pad < 0);
3724
3725 /* Use put_unaligned() because stats may not be aligned for u64. */
3726 put_unaligned(items, &stats[0]);
3727 for (i = 1; i < items; i++)
3728 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3729
3730 memset(&stats[items], 0, pad);
3731}
3732
3733static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3734 int bytes)
3735{
3736 switch(attrtype) {
3737 case IFLA_INET6_STATS:
3738 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3739 break;
3740 case IFLA_INET6_ICMP6STATS:
3741 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3742 break;
3743 }
3744}
3745
1ab1457c 3746static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3747 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3748{
04561c1f 3749 struct net_device *dev = idev->dev;
bf99f1bd 3750 struct nlattr *nla;
04561c1f
TG		 3751 struct ifinfomsg *hdr;
3752 struct nlmsghdr *nlh;
3753 void *protoinfo;
3754 struct ifla_cacheinfo ci;
3755
3756 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3757 if (nlh == NULL)
26932566 3758 return -EMSGSIZE;
04561c1f
TG		 3759
3760 hdr = nlmsg_data(nlh);
3761 hdr->ifi_family = AF_INET6;
3762 hdr->__ifi_pad = 0;
3763 hdr->ifi_type = dev->type;
3764 hdr->ifi_index = dev->ifindex;
3765 hdr->ifi_flags = dev_get_flags(dev);
3766 hdr->ifi_change = 0;
3767
3768 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3769
3770 if (dev->addr_len)
04561c1f 3771 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3772
04561c1f 3773 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3774 if (dev->ifindex != dev->iflink)
04561c1f 3775 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3776
04561c1f
TG		 3777 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3778 if (protoinfo == NULL)
3779 goto nla_put_failure;
1da177e4 3780
04561c1f 3781 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3782
1da177e4
LT		 3783 ci.max_reasm_len = IPV6_MAXPLEN;
3784 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3785 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3786 ci.reachable_time = idev->nd_parms->reachable_time;
3787 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3788 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3789
bf99f1bd
YH		 3790 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3791 if (nla == NULL)
04561c1f 3792 goto nla_put_failure;
bf99f1bd 3793 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3794
bf99f1bd
YH		 3795 /* XXX - MC not implemented */
3796
3797 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3798 if (nla == NULL)
3799 goto nla_put_failure;
3800 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3801
3802 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3803 if (nla == NULL)
3804 goto nla_put_failure;
3805 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3806
04561c1f
TG		 3807 nla_nest_end(skb, protoinfo);
3808 return nlmsg_end(skb, nlh);
1da177e4 3809
04561c1f 3810nla_put_failure:
26932566
PM		 3811 nlmsg_cancel(skb, nlh);
3812 return -EMSGSIZE;
1da177e4
LT		 3813}
3814
3815static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3816{
3b1e0a65 3817 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3818 int idx, err;
3819 int s_idx = cb->args[0];
3820 struct net_device *dev;
3821 struct inet6_dev *idev;
3822
3823 read_lock(&dev_base_lock);
7562f876 3824 idx = 0;
6fda7350 3825 for_each_netdev(net, dev) {
1da177e4 3826 if (idx < s_idx)
7562f876 3827 goto cont;
1da177e4 3828 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3829 goto cont;
1ab1457c 3830 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3831 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3832 in6_dev_put(idev);
3833 if (err <= 0)
3834 break;
7562f876
PE		 3835cont:
3836 idx++;
1da177e4
LT		 3837 }
3838 read_unlock(&dev_base_lock);
3839 cb->args[0] = idx;
3840
3841 return skb->len;
3842}
3843
3844void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3845{
3846 struct sk_buff *skb;
c346dca1 3847 struct net *net = dev_net(idev->dev);
8d7a76c9 3848 int err = -ENOBUFS;
1ab1457c 3849
339bf98f 3850 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3851 if (skb == NULL)
3852 goto errout;
3853
3854 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3855 if (err < 0) {
3856 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3857 WARN_ON(err == -EMSGSIZE);
3858 kfree_skb(skb);
3859 goto errout;
3860 }
6fda7350 3861 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3862errout:
3863 if (err < 0)
6fda7350 3864 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3865}
3866
339bf98f
TG		 3867static inline size_t inet6_prefix_nlmsg_size(void)
3868{
3869 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3870 + nla_total_size(sizeof(struct in6_addr))
3871 + nla_total_size(sizeof(struct prefix_cacheinfo));
3872}
c5396a31 3873
1da177e4 3874static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3875 struct prefix_info *pinfo, u32 pid, u32 seq,
3876 int event, unsigned int flags)
1da177e4 3877{
6051e2f4
TG		 3878 struct prefixmsg *pmsg;
3879 struct nlmsghdr *nlh;
1da177e4
LT		 3880 struct prefix_cacheinfo ci;
3881
6051e2f4
TG		 3882 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3883 if (nlh == NULL)
26932566 3884 return -EMSGSIZE;
6051e2f4
TG		 3885
3886 pmsg = nlmsg_data(nlh);
1da177e4 3887 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3888 pmsg->prefix_pad1 = 0;
3889 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3890 pmsg->prefix_ifindex = idev->dev->ifindex;
3891 pmsg->prefix_len = pinfo->prefix_len;
3892 pmsg->prefix_type = pinfo->type;
8a47077a 3893 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3894 pmsg->prefix_flags = 0;
3895 if (pinfo->onlink)
3896 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3897 if (pinfo->autoconf)
3898 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3899
6051e2f4 3900 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3901
3902 ci.preferred_time = ntohl(pinfo->prefered);
3903 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3904 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3905
6051e2f4 3906 return nlmsg_end(skb, nlh);
1da177e4 3907
6051e2f4 3908nla_put_failure:
26932566
PM		 3909 nlmsg_cancel(skb, nlh);
3910 return -EMSGSIZE;
1da177e4
LT		 3911}
3912
1ab1457c 3913static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3914 struct prefix_info *pinfo)
3915{
3916 struct sk_buff *skb;
c346dca1 3917 struct net *net = dev_net(idev->dev);
8c384bfa 3918 int err = -ENOBUFS;
1da177e4 3919
339bf98f 3920 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3921 if (skb == NULL)
3922 goto errout;
3923
3924 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3925 if (err < 0) {
3926 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3927 WARN_ON(err == -EMSGSIZE);
3928 kfree_skb(skb);
3929 goto errout;
3930 }
6fda7350 3931 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3932errout:
3933 if (err < 0)
6fda7350 3934 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3935}
3936
1da177e4
LT		 3937static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3938{
3939 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3940
3941 switch (event) {
3942 case RTM_NEWADDR:
95c385b4
NH		 3943 /*
3944 * If the address was optimistic
3945 * we inserted the route at the start of
3946 * our DAD process, so we don't need
3947 * to do it again
3948 */
3949 if (!(ifp->rt->rt6i_node))
3950 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3951 if (ifp->idev->cnf.forwarding)
3952 addrconf_join_anycast(ifp);
3953 break;
3954 case RTM_DELADDR:
3955 if (ifp->idev->cnf.forwarding)
3956 addrconf_leave_anycast(ifp);
3957 addrconf_leave_solict(ifp->idev, &ifp->addr);
3958 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3959 if (ip6_del_rt(ifp->rt))
1da177e4 3960 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3961 break;
3962 }
3963}
3964
3965static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3966{
8814c4b5 3967 rcu_read_lock_bh();
1da177e4
LT		 3968 if (likely(ifp->idev->dead == 0))
3969 __ipv6_ifa_notify(event, ifp);
8814c4b5 3970 rcu_read_unlock_bh();
1da177e4
LT		 3971}
3972
3973#ifdef CONFIG_SYSCTL
3974
3975static
3976int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3977 void __user *buffer, size_t *lenp, loff_t *ppos)
3978{
3979 int *valp = ctl->data;
3980 int val = *valp;
3981 int ret;
3982
3983 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3984
c8fecf22
PE		 3985 if (write)
3986 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3987 return ret;
1da177e4
LT		 3988}
3989
1ab1457c 3990static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3991 void __user *oldval,
3992 size_t __user *oldlenp,
1f29bcd7 3993 void __user *newval, size_t newlen)
1da177e4
LT		 3994{
3995 int *valp = table->data;
c8fecf22 3996 int val = *valp;
1da177e4
LT		 3997 int new;
3998
3999 if (!newval || !newlen)
4000 return 0;
4001 if (newlen != sizeof(int))
4002 return -EINVAL;
4003 if (get_user(new, (int __user *)newval))
4004 return -EFAULT;
4005 if (new == *valp)
4006 return 0;
4007 if (oldval && oldlenp) {
4008 size_t len;
4009 if (get_user(len, oldlenp))
4010 return -EFAULT;
4011 if (len) {
4012 if (len > table->maxlen)
4013 len = table->maxlen;
4014 if (copy_to_user(oldval, valp, len))
4015 return -EFAULT;
4016 if (put_user(len, oldlenp))
4017 return -EFAULT;
4018 }
4019 }
4020
c8fecf22
PE		 4021 *valp = new;
4022 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 4023 return 1;
4024}
4025
4026static struct addrconf_sysctl_table
4027{
4028 struct ctl_table_header *sysctl_header;
f6a07b29 4029 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4030 char *dev_name;
ab32ea5d 4031} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4032 .sysctl_header = NULL,
4033 .addrconf_vars = {
1ab1457c 4034 {
1da177e4
LT		 4035 .ctl_name = NET_IPV6_FORWARDING,
4036 .procname = "forwarding",
1ab1457c 4037 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4038 .maxlen = sizeof(int),
4039 .mode = 0644,
6d9f239a
AD		 4040 .proc_handler = addrconf_sysctl_forward,
4041 .strategy = addrconf_sysctl_forward_strategy,
1da177e4
LT		 4042 },
4043 {
4044 .ctl_name = NET_IPV6_HOP_LIMIT,
4045 .procname = "hop_limit",
1ab1457c 4046 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4047 .maxlen = sizeof(int),
4048 .mode = 0644,
4049 .proc_handler = proc_dointvec,
4050 },
4051 {
4052 .ctl_name = NET_IPV6_MTU,
4053 .procname = "mtu",
4054 .data = &ipv6_devconf.mtu6,
1ab1457c 4055 .maxlen = sizeof(int),
1da177e4 4056 .mode = 0644,
6d9f239a 4057 .proc_handler = proc_dointvec,
1da177e4
LT		 4058 },
4059 {
4060 .ctl_name = NET_IPV6_ACCEPT_RA,
4061 .procname = "accept_ra",
1ab1457c 4062 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4063 .maxlen = sizeof(int),
4064 .mode = 0644,
6d9f239a 4065 .proc_handler = proc_dointvec,
1da177e4
LT		 4066 },
4067 {
4068 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4069 .procname = "accept_redirects",
1ab1457c 4070 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4071 .maxlen = sizeof(int),
4072 .mode = 0644,
6d9f239a 4073 .proc_handler = proc_dointvec,
1da177e4
LT		 4074 },
4075 {
4076 .ctl_name = NET_IPV6_AUTOCONF,
4077 .procname = "autoconf",
1ab1457c 4078 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4079 .maxlen = sizeof(int),
4080 .mode = 0644,
6d9f239a 4081 .proc_handler = proc_dointvec,
1da177e4
LT		 4082 },
4083 {
4084 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4085 .procname = "dad_transmits",
1ab1457c 4086 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4087 .maxlen = sizeof(int),
4088 .mode = 0644,
6d9f239a 4089 .proc_handler = proc_dointvec,
1da177e4
LT		 4090 },
4091 {
4092 .ctl_name = NET_IPV6_RTR_SOLICITS,
4093 .procname = "router_solicitations",
1ab1457c 4094 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4095 .maxlen = sizeof(int),
4096 .mode = 0644,
6d9f239a 4097 .proc_handler = proc_dointvec,
1da177e4
LT		 4098 },
4099 {
4100 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4101 .procname = "router_solicitation_interval",
1ab1457c 4102 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4103 .maxlen = sizeof(int),
4104 .mode = 0644,
6d9f239a
AD		 4105 .proc_handler = proc_dointvec_jiffies,
4106 .strategy = sysctl_jiffies,
1da177e4
LT		 4107 },
4108 {
4109 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4110 .procname = "router_solicitation_delay",
1ab1457c 4111 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4112 .maxlen = sizeof(int),
4113 .mode = 0644,
6d9f239a
AD		 4114 .proc_handler = proc_dointvec_jiffies,
4115 .strategy = sysctl_jiffies,
1da177e4
LT		 4116 },
4117 {
4118 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4119 .procname = "force_mld_version",
1ab1457c 4120 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4121 .maxlen = sizeof(int),
4122 .mode = 0644,
6d9f239a 4123 .proc_handler = proc_dointvec,
1da177e4
LT		 4124 },
4125#ifdef CONFIG_IPV6_PRIVACY
4126 {
4127 .ctl_name = NET_IPV6_USE_TEMPADDR,
4128 .procname = "use_tempaddr",
1ab1457c 4129 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4130 .maxlen = sizeof(int),
4131 .mode = 0644,
6d9f239a 4132 .proc_handler = proc_dointvec,
1da177e4
LT		 4133 },
4134 {
4135 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4136 .procname = "temp_valid_lft",
1ab1457c 4137 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4138 .maxlen = sizeof(int),
4139 .mode = 0644,
6d9f239a 4140 .proc_handler = proc_dointvec,
1da177e4
LT		 4141 },
4142 {
4143 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4144 .procname = "temp_prefered_lft",
1ab1457c 4145 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4146 .maxlen = sizeof(int),
4147 .mode = 0644,
6d9f239a 4148 .proc_handler = proc_dointvec,
1da177e4
LT		 4149 },
4150 {
4151 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4152 .procname = "regen_max_retry",
1ab1457c 4153 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4154 .maxlen = sizeof(int),
4155 .mode = 0644,
6d9f239a 4156 .proc_handler = proc_dointvec,
1da177e4
LT		 4157 },
4158 {
4159 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4160 .procname = "max_desync_factor",
1ab1457c 4161 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4162 .maxlen = sizeof(int),
4163 .mode = 0644,
6d9f239a 4164 .proc_handler = proc_dointvec,
1da177e4
LT		 4165 },
4166#endif
4167 {
4168 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4169 .procname = "max_addresses",
4170 .data = &ipv6_devconf.max_addresses,
4171 .maxlen = sizeof(int),
4172 .mode = 0644,
6d9f239a 4173 .proc_handler = proc_dointvec,
1da177e4 4174 },
65f5c7c1
YH		 4175 {
4176 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4177 .procname = "accept_ra_defrtr",
1ab1457c 4178 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4179 .maxlen = sizeof(int),
4180 .mode = 0644,
6d9f239a 4181 .proc_handler = proc_dointvec,
65f5c7c1 4182 },
c4fd30eb
YH		 4183 {
4184 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4185 .procname = "accept_ra_pinfo",
1ab1457c 4186 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4187 .maxlen = sizeof(int),
4188 .mode = 0644,
6d9f239a 4189 .proc_handler = proc_dointvec,
c4fd30eb 4190 },
930d6ff2
YH		 4191#ifdef CONFIG_IPV6_ROUTER_PREF
4192 {
4193 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4194 .procname = "accept_ra_rtr_pref",
4195 .data = &ipv6_devconf.accept_ra_rtr_pref,
4196 .maxlen = sizeof(int),
4197 .mode = 0644,
6d9f239a 4198 .proc_handler = proc_dointvec,
930d6ff2 4199 },
52e16356
YH		 4200 {
4201 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4202 .procname = "router_probe_interval",
4203 .data = &ipv6_devconf.rtr_probe_interval,
4204 .maxlen = sizeof(int),
4205 .mode = 0644,
6d9f239a
AD		 4206 .proc_handler = proc_dointvec_jiffies,
4207 .strategy = sysctl_jiffies,
52e16356 4208 },
fa03ef38 4209#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4210 {
4211 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4212 .procname = "accept_ra_rt_info_max_plen",
4213 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4214 .maxlen = sizeof(int),
4215 .mode = 0644,
6d9f239a 4216 .proc_handler = proc_dointvec,
09c884d4
YH		 4217 },
4218#endif
930d6ff2 4219#endif
fbea49e1
YH		 4220 {
4221 .ctl_name = NET_IPV6_PROXY_NDP,
4222 .procname = "proxy_ndp",
4223 .data = &ipv6_devconf.proxy_ndp,
4224 .maxlen = sizeof(int),
4225 .mode = 0644,
6d9f239a 4226 .proc_handler = proc_dointvec,
fbea49e1 4227 },
0bcbc926
YH		 4228 {
4229 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4230 .procname = "accept_source_route",
4231 .data = &ipv6_devconf.accept_source_route,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
6d9f239a 4234 .proc_handler = proc_dointvec,
0bcbc926 4235 },
95c385b4
NH		 4236#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4237 {
4238 .ctl_name = CTL_UNNUMBERED,
4239 .procname = "optimistic_dad",
4240 .data = &ipv6_devconf.optimistic_dad,
4241 .maxlen = sizeof(int),
4242 .mode = 0644,
6d9f239a 4243 .proc_handler = proc_dointvec,
95c385b4
NH		 4244
4245 },
7bc570c8
YH		 4246#endif
4247#ifdef CONFIG_IPV6_MROUTE
4248 {
4249 .ctl_name = CTL_UNNUMBERED,
4250 .procname = "mc_forwarding",
4251 .data = &ipv6_devconf.mc_forwarding,
4252 .maxlen = sizeof(int),
a4e6db07 4253 .mode = 0444,
6d9f239a 4254 .proc_handler = proc_dointvec,
7bc570c8 4255 },
95c385b4 4256#endif
778d80be
YH		 4257 {
4258 .ctl_name = CTL_UNNUMBERED,
4259 .procname = "disable_ipv6",
4260 .data = &ipv6_devconf.disable_ipv6,
4261 .maxlen = sizeof(int),
4262 .mode = 0644,
6d9f239a 4263 .proc_handler = proc_dointvec,
778d80be 4264 },
1b34be74
YH		 4265 {
4266 .ctl_name = CTL_UNNUMBERED,
4267 .procname = "accept_dad",
4268 .data = &ipv6_devconf.accept_dad,
4269 .maxlen = sizeof(int),
4270 .mode = 0644,
6d9f239a 4271 .proc_handler = proc_dointvec,
1b34be74 4272 },
1da177e4
LT		 4273 {
4274 .ctl_name = 0, /* sentinel */
4275 }
4276 },
1da177e4
LT		 4277};
4278
bff16c2f
PE		 4279static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4280 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4281{
4282 int i;
1da177e4 4283 struct addrconf_sysctl_table *t;
1da177e4 4284
1dab6222
PE		 4285#define ADDRCONF_CTL_PATH_DEV 3
4286
4287 struct ctl_path addrconf_ctl_path[] = {
4288 { .procname = "net", .ctl_name = CTL_NET, },
4289 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4290 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4291 { /* to be set */ },
4292 { },
4293 };
4294
4295
af879cc7 4296 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4297 if (t == NULL)
f68635e6
PE		 4298 goto out;
4299
1da177e4
LT		 4300 for (i=0; t->addrconf_vars[i].data; i++) {
4301 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4302 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4303 t->addrconf_vars[i].extra2 = net;
1da177e4 4304 }
1da177e4 4305
1ab1457c
YH		 4306 /*
4307 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4308 * by sysctl and we wouldn't want anyone to change it under our feet
4309 * (see SIOCSIFNAME).
1ab1457c 4310 */
1dab6222
PE		 4311 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4312 if (!t->dev_name)
f68635e6 4313 goto free;
1da177e4 4314
1dab6222
PE		 4315 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4316 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4317
bff16c2f 4318 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4319 t->addrconf_vars);
1da177e4
LT		 4320 if (t->sysctl_header == NULL)
4321 goto free_procname;
f68635e6
PE		 4322
4323 p->sysctl = t;
95897312 4324 return 0;
1da177e4 4325
f68635e6 4326free_procname:
1dab6222 4327 kfree(t->dev_name);
f68635e6 4328free:
1da177e4 4329 kfree(t);
f68635e6 4330out:
95897312 4331 return -ENOBUFS;
1da177e4
LT		 4332}
4333
408c4768
PE		 4334static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4335{
4336 struct addrconf_sysctl_table *t;
4337
4338 if (p->sysctl == NULL)
4339 return;
4340
4341 t = p->sysctl;
4342 p->sysctl = NULL;
4343 unregister_sysctl_table(t->sysctl_header);
4344 kfree(t->dev_name);
4345 kfree(t);
4346}
4347
f52295a9
PE		 4348static void addrconf_sysctl_register(struct inet6_dev *idev)
4349{
408c4768
PE		 4350 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4351 NET_IPV6_NEIGH, "ipv6",
4352 &ndisc_ifinfo_sysctl_change,
0686caa3 4353 ndisc_ifinfo_sysctl_strategy);
c346dca1 4354 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4355 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4356}
4357
408c4768 4358static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4359{
408c4768
PE		 4360 __addrconf_sysctl_unregister(&idev->cnf);
4361 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4362}
4363
4364
4365#endif
4366
e0da5a48
PE		 4367static int addrconf_init_net(struct net *net)
4368{
4369 int err;
4370 struct ipv6_devconf *all, *dflt;
4371
4372 err = -ENOMEM;
4373 all = &ipv6_devconf;
4374 dflt = &ipv6_devconf_dflt;
4375
4376 if (net != &init_net) {
4377 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4378 if (all == NULL)
4379 goto err_alloc_all;
4380
4381 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4382 if (dflt == NULL)
4383 goto err_alloc_dflt;
4384 }
4385
4386 net->ipv6.devconf_all = all;
4387 net->ipv6.devconf_dflt = dflt;
4388
4389#ifdef CONFIG_SYSCTL
4390 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4391 NULL, all);
4392 if (err < 0)
4393 goto err_reg_all;
4394
4395 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4396 NULL, dflt);
4397 if (err < 0)
4398 goto err_reg_dflt;
4399#endif
4400 return 0;
4401
4402#ifdef CONFIG_SYSCTL
4403err_reg_dflt:
4404 __addrconf_sysctl_unregister(all);
4405err_reg_all:
4406 kfree(dflt);
4407#endif
4408err_alloc_dflt:
4409 kfree(all);
4410err_alloc_all:
4411 return err;
4412}
4413
4414static void addrconf_exit_net(struct net *net)
4415{
4416#ifdef CONFIG_SYSCTL
4417 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4418 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4419#endif
4420 if (net != &init_net) {
4421 kfree(net->ipv6.devconf_dflt);
4422 kfree(net->ipv6.devconf_all);
4423 }
4424}
4425
4426static struct pernet_operations addrconf_ops = {
4427 .init = addrconf_init_net,
4428 .exit = addrconf_exit_net,
4429};
4430
1da177e4
LT		 4431/*
4432 * Device notifier
4433 */
4434
4435int register_inet6addr_notifier(struct notifier_block *nb)
4436{
1ab1457c 4437 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4438}
4439
7159039a
YH		 4440EXPORT_SYMBOL(register_inet6addr_notifier);
4441
1da177e4
LT		 4442int unregister_inet6addr_notifier(struct notifier_block *nb)
4443{
1ab1457c 4444 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4445}
4446
7159039a
YH		 4447EXPORT_SYMBOL(unregister_inet6addr_notifier);
4448
af284937
DL		 4449static void addrconf_net_exit(struct net *net)
4450{
6fda7350
BT		 4451 struct net_device *dev;
4452
6fda7350
BT		 4453 rtnl_lock();
4454 /* clean dev list */
4455 for_each_netdev(net, dev) {
4456 if (__in6_dev_get(dev) == NULL)
4457 continue;
4458 addrconf_ifdown(dev, 1);
4459 }
4460 addrconf_ifdown(net->loopback_dev, 2);
4461 rtnl_unlock();
af284937
DL		 4462}
4463
4464static struct pernet_operations addrconf_net_ops = {
af284937
DL		 4465 .exit = addrconf_net_exit,
4466};
4467
1da177e4
LT		 4468/*
4469 * Init / cleanup code
4470 */
4471
4472int __init addrconf_init(void)
4473{
2a8cc6c8
YH		 4474 int err;
4475
4476 if ((err = ipv6_addr_label_init()) < 0) {
4477 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4478 err);
4479 return err;
4480 }
1da177e4 4481
e0da5a48
PE		 4482 register_pernet_subsys(&addrconf_ops);
4483
1da177e4
LT		 4484 /* The addrconf netdev notifier requires that loopback_dev
4485 * has it's ipv6 private information allocated and setup
4486 * before it can bring up and give link-local addresses
4487 * to other devices which are up.
4488 *
4489 * Unfortunately, loopback_dev is not necessarily the first
4490 * entry in the global dev_base list of net devices. In fact,
4491 * it is likely to be the very last entry on that list.
4492 * So this causes the notifier registry below to try and
4493 * give link-local addresses to all devices besides loopback_dev
4494 * first, then loopback_dev, which cases all the non-loopback_dev
4495 * devices to fail to get a link-local address.
4496 *
4497 * So, as a temporary fix, allocate the ipv6 structure for
4498 * loopback_dev first by hand.
4499 * Longer term, all of the dependencies ipv6 has upon the loopback
4500 * device and it being up should be removed.
4501 */
4502 rtnl_lock();
2774c7ab 4503 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4504 err = -ENOMEM;
4505 rtnl_unlock();
4506 if (err)
e0da5a48 4507 goto errlo;
1da177e4 4508
af284937
DL		 4509 err = register_pernet_device(&addrconf_net_ops);
4510 if (err)
4511 return err;
4512
1da177e4
LT		 4513 register_netdevice_notifier(&ipv6_dev_notf);
4514
1da177e4 4515 addrconf_verify(0);
c127ea2c
TG		 4516
4517 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4518 if (err < 0)
4519 goto errout;
4520
4521 /* Only the first call to __rtnl_register can fail */
4522 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4523 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4524 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4525 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4526 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4527
2a8cc6c8
YH		 4528 ipv6_addr_label_rtnl_register();
4529
1da177e4 4530 return 0;
c127ea2c
TG		 4531errout:
4532 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4533errlo:
4534 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4535
4536 return err;
1da177e4
LT		 4537}
4538
09f7709f 4539void addrconf_cleanup(void)
1da177e4 4540{
1ab1457c 4541 struct inet6_ifaddr *ifa;
1da177e4
LT		 4542 int i;
4543
4544 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4545 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4546
e0da5a48 4547 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4548
4549 rtnl_lock();
4550
1da177e4
LT		 4551 /*
4552 * Check hash table.
4553 */
1da177e4
LT		 4554 write_lock_bh(&addrconf_hash_lock);
4555 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4556 for (ifa=inet6_addr_lst[i]; ifa; ) {
4557 struct inet6_ifaddr *bifa;
4558
4559 bifa = ifa;
4560 ifa = ifa->lst_next;
4561 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4562 /* Do not free it; something is wrong.
4563 Now we can investigate it with debugger.
4564 */
4565 }
4566 }
4567 write_unlock_bh(&addrconf_hash_lock);
4568
4569 del_timer(&addr_chk_timer);
1da177e4 4570 rtnl_unlock();
af284937
DL		 4571
4572 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4573}
Clone of davem's net-next-2.6 tree