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net/*: use linux/kernel.h swap()
[deliverable/linux.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>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#ifdef CONFIG_SYSCTL
57#include <linux/sysctl.h>
58#endif
4fc268d2 59#include <linux/capability.h>
1da177e4
LT		 60#include <linux/delay.h>
61#include <linux/notifier.h>
543537bd 62#include <linux/string.h>
1da177e4 63
457c4cbc 64#include <net/net_namespace.h>
1da177e4
LT		 65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
5d620266 75#include <net/netlink.h>
f24e3d65 76#include <net/pkt_sched.h>
1da177e4
LT		 77#include <linux/if_tunnel.h>
78#include <linux/rtnetlink.h>
79
80#ifdef CONFIG_IPV6_PRIVACY
81#include <linux/random.h>
1da177e4
LT		 82#endif
83
84#include <asm/uaccess.h>
7f7d9a6b 85#include <asm/unaligned.h>
1da177e4
LT		 86
87#include <linux/proc_fs.h>
88#include <linux/seq_file.h>
89
90/* Set to 3 to get tracing... */
91#define ACONF_DEBUG 2
92
93#if ACONF_DEBUG >= 3
94#define ADBG(x) printk x
95#else
96#define ADBG(x)
97#endif
98
99#define INFINITY_LIFE_TIME 0xFFFFFFFF
100#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102#ifdef CONFIG_SYSCTL
f52295a9 103static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 104static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105#else
106static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107{
108}
109
110static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111{
112}
1da177e4
LT		 113#endif
114
115#ifdef CONFIG_IPV6_PRIVACY
116static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 117static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 118static void ipv6_regen_rndid(unsigned long data);
119
120static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 121#endif
122
1b34be74 123static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
888c848e 157static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 188 .disable_ipv6 = 0,
1b34be74 189 .accept_dad = 1,
1da177e4
LT		 190};
191
ab32ea5d 192static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 193 .forwarding = 0,
194 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
195 .mtu6 = IPV6_MIN_MTU,
196 .accept_ra = 1,
197 .accept_redirects = 1,
198 .autoconf = 1,
199 .dad_transmits = 1,
200 .rtr_solicits = MAX_RTR_SOLICITATIONS,
201 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
202 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
203#ifdef CONFIG_IPV6_PRIVACY
204 .use_tempaddr = 0,
205 .temp_valid_lft = TEMP_VALID_LIFETIME,
206 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
207 .regen_max_retry = REGEN_MAX_RETRY,
208 .max_desync_factor = MAX_DESYNC_FACTOR,
209#endif
210 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 211 .accept_ra_defrtr = 1,
c4fd30eb 212 .accept_ra_pinfo = 1,
930d6ff2
YH		 213#ifdef CONFIG_IPV6_ROUTER_PREF
214 .accept_ra_rtr_pref = 1,
52e16356 215 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 216#ifdef CONFIG_IPV6_ROUTE_INFO
217 .accept_ra_rt_info_max_plen = 0,
218#endif
930d6ff2 219#endif
fbea49e1 220 .proxy_ndp = 0,
0bcbc926 221 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 222 .disable_ipv6 = 0,
1b34be74 223 .accept_dad = 1,
1da177e4
LT		 224};
225
226/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 227const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 228const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 229const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
230const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 231
f24e3d65 232/* Check if a valid qdisc is available */
05297949 233static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 234{
05297949 235 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 236}
237
2b5ead46
YH		 238/* Check if a route is valid prefix route */
239static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
240{
241 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
242}
243
1da177e4
LT		 244static void addrconf_del_timer(struct inet6_ifaddr *ifp)
245{
246 if (del_timer(&ifp->timer))
247 __in6_ifa_put(ifp);
248}
249
250enum addrconf_timer_t
251{
252 AC_NONE,
253 AC_DAD,
254 AC_RS,
255};
256
257static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
258 enum addrconf_timer_t what,
259 unsigned long when)
260{
261 if (!del_timer(&ifp->timer))
262 in6_ifa_hold(ifp);
263
264 switch (what) {
265 case AC_DAD:
266 ifp->timer.function = addrconf_dad_timer;
267 break;
268 case AC_RS:
269 ifp->timer.function = addrconf_rs_timer;
270 break;
271 default:;
272 }
273 ifp->timer.expires = jiffies + when;
274 add_timer(&ifp->timer);
275}
276
7f7d9a6b
HX		 277static int snmp6_alloc_dev(struct inet6_dev *idev)
278{
7f7d9a6b 279 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 280 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 281 goto err_ip;
282 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 283 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 284 goto err_icmp;
14878f75 285 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 286 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 287 goto err_icmpmsg;
7f7d9a6b
HX		 288
289 return 0;
290
14878f75
DS		 291err_icmpmsg:
292 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 293err_icmp:
294 snmp_mib_free((void **)idev->stats.ipv6);
295err_ip:
aaf70ec7 296 return -ENOMEM;
7f7d9a6b
HX		 297}
298
16910b98 299static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 300{
14878f75 301 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 302 snmp_mib_free((void **)idev->stats.icmpv6);
303 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 304}
305
1da177e4
LT		 306/* Nobody refers to this device, we may destroy it. */
307
8814c4b5
YH		 308static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
309{
310 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
311 kfree(idev);
312}
313
1da177e4
LT		 314void in6_dev_finish_destroy(struct inet6_dev *idev)
315{
316 struct net_device *dev = idev->dev;
547b792c
IJ		 317
318 WARN_ON(idev->addr_list != NULL);
319 WARN_ON(idev->mc_list != NULL);
320
1da177e4
LT		 321#ifdef NET_REFCNT_DEBUG
322 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
323#endif
324 dev_put(dev);
325 if (!idev->dead) {
326 printk("Freeing alive inet6 device %p\n", idev);
327 return;
328 }
329 snmp6_free_dev(idev);
8814c4b5 330 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 331}
332
7159039a
YH		 333EXPORT_SYMBOL(in6_dev_finish_destroy);
334
1da177e4
LT		 335static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
336{
337 struct inet6_dev *ndev;
338
339 ASSERT_RTNL();
340
341 if (dev->mtu < IPV6_MIN_MTU)
342 return NULL;
343
1ab1457c 344 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 345
1ab1457c
YH		 346 if (ndev == NULL)
347 return NULL;
322f74a4
IO		 348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
c346dca1 351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (ndev->nd_parms == NULL) {
356 kfree(ndev);
357 return NULL;
358 }
0187bdfb
BH		 359 if (ndev->cnf.forwarding)
360 dev_disable_lro(dev);
322f74a4
IO		 361 /* We refer to the device */
362 dev_hold(dev);
1da177e4 363
322f74a4
IO		 364 if (snmp6_alloc_dev(ndev) < 0) {
365 ADBG((KERN_WARNING
366 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 367 __func__, dev->name));
322f74a4
IO		 368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
369 ndev->dead = 1;
370 in6_dev_finish_destroy(ndev);
371 return NULL;
372 }
1da177e4 373
322f74a4
IO		 374 if (snmp6_register_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
376 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 377 __func__, dev->name));
322f74a4
IO		 378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379 ndev->dead = 1;
380 in6_dev_finish_destroy(ndev);
381 return NULL;
382 }
383
384 /* One reference from device. We must do this before
385 * we invoke __ipv6_regen_rndid().
386 */
387 in6_dev_hold(ndev);
1da177e4 388
1b34be74
YH		 389 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
390 ndev->cnf.accept_dad = -1;
391
b077d7ab
YH		 392#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
393 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
394 printk(KERN_INFO
395 "%s: Disabled Multicast RS\n",
396 dev->name);
397 ndev->cnf.rtr_solicits = 0;
398 }
399#endif
400
1da177e4 401#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 402 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 403 if ((dev->flags&IFF_LOOPBACK) ||
404 dev->type == ARPHRD_TUNNEL ||
9625ed72 405 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 406 dev->type == ARPHRD_SIT ||
0be669bb 407 dev->type == ARPHRD_NONE) {
322f74a4
IO		 408 printk(KERN_INFO
409 "%s: Disabled Privacy Extensions\n",
410 dev->name);
411 ndev->cnf.use_tempaddr = -1;
412 } else {
413 in6_dev_hold(ndev);
414 ipv6_regen_rndid((unsigned long) ndev);
415 }
1da177e4
LT		 416#endif
417
f24e3d65 418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 419 ndev->if_flags |= IF_READY;
420
322f74a4
IO		 421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
f52295a9 423 addrconf_sysctl_register(ndev);
30c4cf57
DS		 424 /* protected by rtnl_lock */
425 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 426
427 /* Join all-node multicast group */
f3ee4010 428 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 429
1da177e4
LT		 430 return ndev;
431}
432
cee89473 433static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 434{
435 struct inet6_dev *idev;
436
437 ASSERT_RTNL();
438
439 if ((idev = __in6_dev_get(dev)) == NULL) {
440 if ((idev = ipv6_add_dev(dev)) == NULL)
441 return NULL;
442 }
c5e33bdd 443
1da177e4
LT		 444 if (dev->flags&IFF_UP)
445 ipv6_mc_up(idev);
446 return idev;
447}
448
449#ifdef CONFIG_SYSCTL
450static void dev_forward_change(struct inet6_dev *idev)
451{
452 struct net_device *dev;
453 struct inet6_ifaddr *ifa;
1da177e4
LT		 454
455 if (!idev)
456 return;
457 dev = idev->dev;
0187bdfb
BH		 458 if (idev->cnf.forwarding)
459 dev_disable_lro(dev);
1da177e4 460 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 461 if (idev->cnf.forwarding)
f3ee4010 462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 463 else
f3ee4010 464 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 465 }
466 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 467 if (ifa->flags&IFA_F_TENTATIVE)
468 continue;
1da177e4
LT		 469 if (idev->cnf.forwarding)
470 addrconf_join_anycast(ifa);
471 else
472 addrconf_leave_anycast(ifa);
473 }
474}
475
476
e186932b 477static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 478{
479 struct net_device *dev;
480 struct inet6_dev *idev;
481
482 read_lock(&dev_base_lock);
bff16c2f 483 for_each_netdev(net, dev) {
8814c4b5 484 rcu_read_lock();
1da177e4
LT		 485 idev = __in6_dev_get(dev);
486 if (idev) {
e186932b
PE		 487 int changed = (!idev->cnf.forwarding) ^ (!newf);
488 idev->cnf.forwarding = newf;
1da177e4
LT		 489 if (changed)
490 dev_forward_change(idev);
491 }
8814c4b5 492 rcu_read_unlock();
1da177e4
LT		 493 }
494 read_unlock(&dev_base_lock);
495}
c8fecf22 496
b325fddb 497static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 498{
bff16c2f
PE		 499 struct net *net;
500
501 net = (struct net *)table->extra2;
441fc2a2 502 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 503 return 0;
504
505 if (!rtnl_trylock())
506 return -ERESTARTSYS;
c8fecf22 507
e186932b
PE		 508 if (p == &net->ipv6.devconf_all->forwarding) {
509 __s32 newf = net->ipv6.devconf_all->forwarding;
510 net->ipv6.devconf_dflt->forwarding = newf;
511 addrconf_forward_change(net, newf);
c8fecf22
PE		 512 } else if ((!*p) ^ (!old))
513 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 514 rtnl_unlock();
c8fecf22
PE		 515
516 if (*p)
7b4da532 517 rt6_purge_dflt_routers(net);
b325fddb 518 return 1;
c8fecf22 519}
1da177e4
LT		 520#endif
521
522/* Nobody refers to this ifaddr, destroy it */
523
524void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
525{
547b792c
IJ		 526 WARN_ON(ifp->if_next != NULL);
527 WARN_ON(ifp->lst_next != NULL);
528
1da177e4
LT		 529#ifdef NET_REFCNT_DEBUG
530 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
531#endif
532
533 in6_dev_put(ifp->idev);
534
535 if (del_timer(&ifp->timer))
536 printk("Timer is still running, when freeing ifa=%p\n", ifp);
537
538 if (!ifp->dead) {
539 printk("Freeing alive inet6 address %p\n", ifp);
540 return;
541 }
542 dst_release(&ifp->rt->u.dst);
543
544 kfree(ifp);
545}
546
e55ffac6
BH		 547static void
548ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
549{
550 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 551 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 552
553 /*
554 * Each device address list is sorted in order of scope -
555 * global before linklocal.
556 */
557 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
558 ifap = &ifa->if_next) {
8a6ce0c0 559 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 560 break;
561 }
562
563 ifp->if_next = *ifap;
564 *ifap = ifp;
565}
566
3eb84f49
YH		 567/*
568 * Hash function taken from net_alias.c
569 */
570static u8 ipv6_addr_hash(const struct in6_addr *addr)
571{
572 __u32 word;
573
574 /*
575 * We perform the hash function over the last 64 bits of the address
576 * This will include the IEEE address token on links that support it.
577 */
578
579 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
580 word ^= (word >> 16);
581 word ^= (word >> 8);
582
583 return ((word ^ (word >> 4)) & 0x0f);
584}
585
1da177e4
LT		 586/* On success it returns ifp with increased reference count */
587
588static struct inet6_ifaddr *
589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 590 int scope, u32 flags)
1da177e4
LT		 591{
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
9bdd8d40 594 struct net *net = dev_net(idev->dev);
1da177e4
LT		 595 int hash;
596 int err = 0;
d68b8270
YH		 597 int addr_type = ipv6_addr_type(addr);
598
599 if (addr_type == IPV6_ADDR_ANY ||
600 addr_type & IPV6_ADDR_MULTICAST ||
601 (!(idev->dev->flags & IFF_LOOPBACK) &&
602 addr_type & IPV6_ADDR_LOOPBACK))
603 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 604
8814c4b5 605 rcu_read_lock_bh();
1da177e4
LT		 606 if (idev->dead) {
607 err = -ENODEV; /*XXX*/
608 goto out2;
609 }
610
9bdd8d40
BH		 611 if (idev->cnf.disable_ipv6 || net->ipv6.devconf_all->disable_ipv6) {
612 err = -EACCES;
613 goto out2;
614 }
615
1da177e4
LT		 616 write_lock(&addrconf_hash_lock);
617
618 /* Ignore adding duplicate addresses on an interface */
c346dca1 619 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 620 ADBG(("ipv6_add_addr: already assigned\n"));
621 err = -EEXIST;
622 goto out;
623 }
624
322f74a4 625 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 626
627 if (ifa == NULL) {
628 ADBG(("ipv6_add_addr: malloc failed\n"));
629 err = -ENOBUFS;
630 goto out;
631 }
632
633 rt = addrconf_dst_alloc(idev, addr, 0);
634 if (IS_ERR(rt)) {
635 err = PTR_ERR(rt);
636 goto out;
637 }
638
1da177e4
LT		 639 ipv6_addr_copy(&ifa->addr, addr);
640
641 spin_lock_init(&ifa->lock);
642 init_timer(&ifa->timer);
643 ifa->timer.data = (unsigned long) ifa;
644 ifa->scope = scope;
645 ifa->prefix_len = pfxlen;
646 ifa->flags = flags | IFA_F_TENTATIVE;
647 ifa->cstamp = ifa->tstamp = jiffies;
648
57f5f544
KF		 649 ifa->rt = rt;
650
95c385b4
NH		 651 /*
652 * part one of RFC 4429, section 3.3
653 * We should not configure an address as
654 * optimistic if we do not yet know the link
655 * layer address of our nexhop router
656 */
657
658 if (rt->rt6i_nexthop == NULL)
659 ifa->flags &= ~IFA_F_OPTIMISTIC;
660
1da177e4
LT		 661 ifa->idev = idev;
662 in6_dev_hold(idev);
663 /* For caller */
664 in6_ifa_hold(ifa);
665
666 /* Add to big hash table */
667 hash = ipv6_addr_hash(addr);
668
669 ifa->lst_next = inet6_addr_lst[hash];
670 inet6_addr_lst[hash] = ifa;
671 in6_ifa_hold(ifa);
672 write_unlock(&addrconf_hash_lock);
673
674 write_lock(&idev->lock);
675 /* Add to inet6_dev unicast addr list. */
e55ffac6 676 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 677
678#ifdef CONFIG_IPV6_PRIVACY
679 if (ifa->flags&IFA_F_TEMPORARY) {
680 ifa->tmp_next = idev->tempaddr_list;
681 idev->tempaddr_list = ifa;
682 in6_ifa_hold(ifa);
683 }
684#endif
685
1da177e4
LT		 686 in6_ifa_hold(ifa);
687 write_unlock(&idev->lock);
688out2:
8814c4b5 689 rcu_read_unlock_bh();
1da177e4 690
fd92833a 691 if (likely(err == 0))
e041c683 692 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 693 else {
694 kfree(ifa);
695 ifa = ERR_PTR(err);
696 }
697
698 return ifa;
699out:
700 write_unlock(&addrconf_hash_lock);
701 goto out2;
702}
703
704/* This function wants to get referenced ifp and releases it before return */
705
706static void ipv6_del_addr(struct inet6_ifaddr *ifp)
707{
708 struct inet6_ifaddr *ifa, **ifap;
709 struct inet6_dev *idev = ifp->idev;
710 int hash;
711 int deleted = 0, onlink = 0;
712 unsigned long expires = jiffies;
713
714 hash = ipv6_addr_hash(&ifp->addr);
715
716 ifp->dead = 1;
717
718 write_lock_bh(&addrconf_hash_lock);
719 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
720 ifap = &ifa->lst_next) {
721 if (ifa == ifp) {
722 *ifap = ifa->lst_next;
723 __in6_ifa_put(ifp);
724 ifa->lst_next = NULL;
725 break;
726 }
727 }
728 write_unlock_bh(&addrconf_hash_lock);
729
730 write_lock_bh(&idev->lock);
731#ifdef CONFIG_IPV6_PRIVACY
732 if (ifp->flags&IFA_F_TEMPORARY) {
733 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
734 ifap = &ifa->tmp_next) {
735 if (ifa == ifp) {
736 *ifap = ifa->tmp_next;
737 if (ifp->ifpub) {
738 in6_ifa_put(ifp->ifpub);
739 ifp->ifpub = NULL;
740 }
741 __in6_ifa_put(ifp);
742 ifa->tmp_next = NULL;
743 break;
744 }
745 }
746 }
747#endif
748
1d142804 749 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 750 if (ifa == ifp) {
751 *ifap = ifa->if_next;
752 __in6_ifa_put(ifp);
753 ifa->if_next = NULL;
754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
755 break;
756 deleted = 1;
1d142804 757 continue;
1da177e4
LT		 758 } else if (ifp->flags & IFA_F_PERMANENT) {
759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
760 ifp->prefix_len)) {
761 if (ifa->flags & IFA_F_PERMANENT) {
762 onlink = 1;
763 if (deleted)
764 break;
765 } else {
766 unsigned long lifetime;
767
768 if (!onlink)
769 onlink = -1;
770
771 spin_lock(&ifa->lock);
4bed72e4
YH		 772
773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
774 /*
775 * Note: Because this address is
776 * not permanent, lifetime <
777 * LONG_MAX / HZ here.
778 */
1da177e4
LT		 779 if (time_before(expires,
780 ifa->tstamp + lifetime * HZ))
781 expires = ifa->tstamp + lifetime * HZ;
782 spin_unlock(&ifa->lock);
783 }
784 }
785 }
1d142804 786 ifap = &ifa->if_next;
1da177e4
LT		 787 }
788 write_unlock_bh(&idev->lock);
789
b2238566
AV		 790 addrconf_del_timer(ifp);
791
1da177e4
LT		 792 ipv6_ifa_notify(RTM_DELADDR, ifp);
793
e041c683 794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 795
1da177e4
LT		 796 /*
797 * Purge or update corresponding prefix
798 *
799 * 1) we don't purge prefix here if address was not permanent.
800 * prefix is managed by its own lifetime.
801 * 2) if there're no addresses, delete prefix.
802 * 3) if there're still other permanent address(es),
803 * corresponding prefix is still permanent.
804 * 4) otherwise, update prefix lifetime to the
805 * longest valid lifetime among the corresponding
806 * addresses on the device.
807 * Note: subsequent RA will update lifetime.
808 *
809 * --yoshfuji
810 */
811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
812 struct in6_addr prefix;
813 struct rt6_info *rt;
c346dca1 814 struct net *net = dev_net(ifp->idev->dev);
1da177e4 815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 817
2b5ead46 818 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 819 if (onlink == 0) {
e0a1ad73 820 ip6_del_rt(rt);
1da177e4
LT		 821 rt = NULL;
822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
823 rt->rt6i_expires = expires;
824 rt->rt6i_flags |= RTF_EXPIRES;
825 }
826 }
827 dst_release(&rt->u.dst);
828 }
829
830 in6_ifa_put(ifp);
831}
832
833#ifdef CONFIG_IPV6_PRIVACY
834static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
835{
836 struct inet6_dev *idev = ifp->idev;
837 struct in6_addr addr, *tmpaddr;
838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 839 unsigned long regen_advance;
1da177e4
LT		 840 int tmp_plen;
841 int ret = 0;
842 int max_addresses;
95c385b4 843 u32 addr_flags;
1da177e4
LT		 844
845 write_lock(&idev->lock);
846 if (ift) {
847 spin_lock_bh(&ift->lock);
848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
849 spin_unlock_bh(&ift->lock);
850 tmpaddr = &addr;
851 } else {
852 tmpaddr = NULL;
853 }
854retry:
855 in6_dev_hold(idev);
856 if (idev->cnf.use_tempaddr <= 0) {
857 write_unlock(&idev->lock);
858 printk(KERN_INFO
859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 spin_lock_bh(&ifp->lock);
865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
866 idev->cnf.use_tempaddr = -1; /*XXX*/
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 in6_ifa_hold(ifp);
876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
878 spin_unlock_bh(&ifp->lock);
879 write_unlock(&idev->lock);
880 printk(KERN_WARNING
881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 in6_ifa_put(ifp);
883 in6_dev_put(idev);
884 ret = -1;
885 goto out;
886 }
887 memcpy(&addr.s6_addr[8], idev->rndid, 8);
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft);
1ab1457c
YH		 891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
1da177e4
LT		 893 idev->cnf.temp_prefered_lft - desync_factor / HZ);
894 tmp_plen = ifp->prefix_len;
895 max_addresses = idev->cnf.max_addresses;
896 tmp_cstamp = ifp->cstamp;
897 tmp_tstamp = ifp->tstamp;
898 spin_unlock_bh(&ifp->lock);
899
eac55bf9
BB		 900 regen_advance = idev->cnf.regen_max_retry *
901 idev->cnf.dad_transmits *
902 idev->nd_parms->retrans_time / HZ;
1da177e4 903 write_unlock(&idev->lock);
95c385b4 904
eac55bf9
BB		 905 /* A temporary address is created only if this calculated Preferred
906 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
907 * an implementation must not create a temporary address with a zero
908 * Preferred Lifetime.
909 */
910 if (tmp_prefered_lft <= regen_advance) {
911 in6_ifa_put(ifp);
912 in6_dev_put(idev);
913 ret = -1;
914 goto out;
915 }
916
95c385b4
NH		 917 addr_flags = IFA_F_TEMPORARY;
918 /* set in addrconf_prefix_rcv() */
919 if (ifp->flags & IFA_F_OPTIMISTIC)
920 addr_flags |= IFA_F_OPTIMISTIC;
921
1da177e4 922 ift = !max_addresses ||
1ab1457c 923 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 924 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 addr_flags) : NULL;
1da177e4
LT		 927 if (!ift || IS_ERR(ift)) {
928 in6_ifa_put(ifp);
929 in6_dev_put(idev);
930 printk(KERN_INFO
931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
932 tmpaddr = &addr;
933 write_lock(&idev->lock);
934 goto retry;
935 }
936
937 spin_lock_bh(&ift->lock);
938 ift->ifpub = ifp;
939 ift->valid_lft = tmp_valid_lft;
940 ift->prefered_lft = tmp_prefered_lft;
941 ift->cstamp = tmp_cstamp;
942 ift->tstamp = tmp_tstamp;
943 spin_unlock_bh(&ift->lock);
944
945 addrconf_dad_start(ift, 0);
946 in6_ifa_put(ift);
947 in6_dev_put(idev);
948out:
949 return ret;
950}
951#endif
952
953/*
072047e4 954 * Choose an appropriate source address (RFC3484)
1da177e4 955 */
a9b05723
YH		 956enum {
957 IPV6_SADDR_RULE_INIT = 0,
958 IPV6_SADDR_RULE_LOCAL,
959 IPV6_SADDR_RULE_SCOPE,
960 IPV6_SADDR_RULE_PREFERRED,
961#ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_HOA,
963#endif
964 IPV6_SADDR_RULE_OIF,
965 IPV6_SADDR_RULE_LABEL,
966#ifdef CONFIG_IPV6_PRIVACY
967 IPV6_SADDR_RULE_PRIVACY,
968#endif
969 IPV6_SADDR_RULE_ORCHID,
970 IPV6_SADDR_RULE_PREFIX,
971 IPV6_SADDR_RULE_MAX
972};
973
072047e4 974struct ipv6_saddr_score {
a9b05723
YH		 975 int rule;
976 int addr_type;
977 struct inet6_ifaddr *ifa;
978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
979 int scopedist;
980 int matchlen;
072047e4
YH		 981};
982
a9b05723 983struct ipv6_saddr_dst {
9acd9f3a 984 const struct in6_addr *addr;
a9b05723
YH		 985 int ifindex;
986 int scope;
987 int label;
7cbca67c 988 unsigned int prefs;
a9b05723 989};
072047e4 990
b6f99a21 991static inline int ipv6_saddr_preferred(int type)
1da177e4 992{
072047e4
YH		 993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
994 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
995 return 1;
996 return 0;
1da177e4
LT		 997}
998
3de23255
BT		 999static int ipv6_get_saddr_eval(struct net *net,
1000 struct ipv6_saddr_score *score,
a9b05723
YH		 1001 struct ipv6_saddr_dst *dst,
1002 int i)
1003{
1004 int ret;
1005
1006 if (i <= score->rule) {
1007 switch (i) {
1008 case IPV6_SADDR_RULE_SCOPE:
1009 ret = score->scopedist;
1010 break;
1011 case IPV6_SADDR_RULE_PREFIX:
1012 ret = score->matchlen;
1013 break;
1014 default:
1015 ret = !!test_bit(i, score->scorebits);
1016 }
1017 goto out;
1018 }
1019
1020 switch (i) {
1021 case IPV6_SADDR_RULE_INIT:
1022 /* Rule 0: remember if hiscore is not ready yet */
1023 ret = !!score->ifa;
1024 break;
1025 case IPV6_SADDR_RULE_LOCAL:
1026 /* Rule 1: Prefer same address */
1027 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1028 break;
1029 case IPV6_SADDR_RULE_SCOPE:
1030 /* Rule 2: Prefer appropriate scope
1031 *
1032 * ret
1033 * ^
1034 * -1 | d 15
1035 * ---+--+-+---> scope
1036 * |
1037 * | d is scope of the destination.
1038 * B-d | \
1039 * | \ <- smaller scope is better if
1040 * B-15 | \ if scope is enough for destinaion.
1041 * | ret = B - scope (-1 <= scope >= d <= 15).
1042 * d-C-1 | /
1043 * |/ <- greater is better
1044 * -C / if scope is not enough for destination.
1045 * /| ret = scope - C (-1 <= d < scope <= 15).
1046 *
1047 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1048 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1049 * Assume B = 0 and we get C > 29.
1050 */
1051 ret = __ipv6_addr_src_scope(score->addr_type);
1052 if (ret >= dst->scope)
1053 ret = -ret;
1054 else
1055 ret -= 128; /* 30 is enough */
1056 score->scopedist = ret;
1057 break;
1058 case IPV6_SADDR_RULE_PREFERRED:
1059 /* Rule 3: Avoid deprecated and optimistic addresses */
1060 ret = ipv6_saddr_preferred(score->addr_type) ||
1061 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1062 break;
1063#ifdef CONFIG_IPV6_MIP6
1064 case IPV6_SADDR_RULE_HOA:
7cbca67c 1065 {
a9b05723 1066 /* Rule 4: Prefer home address */
7cbca67c
YH		 1067 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1068 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1069 break;
7cbca67c 1070 }
a9b05723
YH		 1071#endif
1072 case IPV6_SADDR_RULE_OIF:
1073 /* Rule 5: Prefer outgoing interface */
1074 ret = (!dst->ifindex ||
1075 dst->ifindex == score->ifa->idev->dev->ifindex);
1076 break;
1077 case IPV6_SADDR_RULE_LABEL:
1078 /* Rule 6: Prefer matching label */
3de23255
BT		 1079 ret = ipv6_addr_label(net,
1080 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1081 score->ifa->idev->dev->ifindex) == dst->label;
1082 break;
1083#ifdef CONFIG_IPV6_PRIVACY
1084 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1085 {
a9b05723
YH		 1086 /* Rule 7: Prefer public address
1087 * Note: prefer temprary address if use_tempaddr >= 2
1088 */
7cbca67c
YH		 1089 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1090 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1091 score->ifa->idev->cnf.use_tempaddr >= 2;
1092 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1093 break;
7cbca67c 1094 }
a9b05723
YH		 1095#endif
1096 case IPV6_SADDR_RULE_ORCHID:
1097 /* Rule 8-: Prefer ORCHID vs ORCHID or
1098 * non-ORCHID vs non-ORCHID
1099 */
1100 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1101 ipv6_addr_orchid(dst->addr));
1102 break;
1103 case IPV6_SADDR_RULE_PREFIX:
1104 /* Rule 8: Use longest matching prefix */
1105 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1106 dst->addr);
1107 break;
1108 default:
1109 ret = 0;
1110 }
1111
1112 if (ret)
1113 __set_bit(i, score->scorebits);
1114 score->rule = i;
1115out:
1116 return ret;
1117}
1118
191cd582 1119int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1120 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1121 struct in6_addr *saddr)
1da177e4 1122{
a9b05723
YH		 1123 struct ipv6_saddr_score scores[2],
1124 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1125 struct ipv6_saddr_dst dst;
072047e4 1126 struct net_device *dev;
a9b05723 1127 int dst_type;
1da177e4 1128
a9b05723
YH		 1129 dst_type = __ipv6_addr_type(daddr);
1130 dst.addr = daddr;
1131 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1132 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1133 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1134 dst.prefs = prefs;
a9b05723
YH		 1135
1136 hiscore->rule = -1;
1137 hiscore->ifa = NULL;
1da177e4 1138
072047e4 1139 read_lock(&dev_base_lock);
8814c4b5 1140 rcu_read_lock();
1da177e4 1141
6fda7350 1142 for_each_netdev(net, dev) {
072047e4 1143 struct inet6_dev *idev;
072047e4 1144
a9b05723 1145 /* Candidate Source Address (section 4)
072047e4
YH		 1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
a9b05723
YH		 1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1160 continue;
1da177e4 1161
1da177e4 1162 idev = __in6_dev_get(dev);
072047e4
YH		 1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
a9b05723
YH		 1167 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1168 int i;
072047e4 1169
a9b05723 1170 /*
6b3ae80a
YH		 1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
95c385b4 1174 * sense, unless it is also flagged as optimistic.
6b3ae80a 1175 * - Candidate Source Address (section 4)
072047e4
YH		 1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
a9b05723
YH		 1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1182 continue;
a9b05723
YH		 1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1188 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1189 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
a9b05723
YH		 1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
3de23255
BT		 1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
a9b05723
YH		 1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
a0bffffc 1224 swap(hiscore, score);
a9b05723
YH		 1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1da177e4 1230 }
072047e4 1231 }
1da177e4 1232 }
a9b05723 1233try_nextdev:
072047e4 1234 read_unlock_bh(&idev->lock);
1da177e4 1235 }
8814c4b5 1236 rcu_read_unlock();
1da177e4
LT		 1237 read_unlock(&dev_base_lock);
1238
a9b05723 1239 if (!hiscore->ifa)
072047e4 1240 return -EADDRNOTAVAIL;
1ab1457c 1241
a9b05723
YH		 1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243 in6_ifa_put(hiscore->ifa);
072047e4 1244 return 0;
1da177e4
LT		 1245}
1246
5e5f3f0f 1247EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1248
95c385b4
NH		 1249int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250 unsigned char banned_flags)
1da177e4
LT		 1251{
1252 struct inet6_dev *idev;
1253 int err = -EADDRNOTAVAIL;
1254
8814c4b5 1255 rcu_read_lock();
1da177e4
LT		 1256 if ((idev = __in6_dev_get(dev)) != NULL) {
1257 struct inet6_ifaddr *ifp;
1258
1259 read_lock_bh(&idev->lock);
1260 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1261 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1262 ipv6_addr_copy(addr, &ifp->addr);
1263 err = 0;
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&idev->lock);
1268 }
8814c4b5 1269 rcu_read_unlock();
1da177e4
LT		 1270 return err;
1271}
1272
1273static int ipv6_count_addresses(struct inet6_dev *idev)
1274{
1275 int cnt = 0;
1276 struct inet6_ifaddr *ifp;
1277
1278 read_lock_bh(&idev->lock);
1279 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1280 cnt++;
1281 read_unlock_bh(&idev->lock);
1282 return cnt;
1283}
1284
bfeade08
DL		 1285int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 struct net_device *dev, int strict)
1da177e4
LT		 1287{
1288 struct inet6_ifaddr * ifp;
1289 u8 hash = ipv6_addr_hash(addr);
1290
1291 read_lock_bh(&addrconf_hash_lock);
1292 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1293 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1294 continue;
1da177e4
LT		 1295 if (ipv6_addr_equal(&ifp->addr, addr) &&
1296 !(ifp->flags&IFA_F_TENTATIVE)) {
1297 if (dev == NULL || ifp->idev->dev == dev ||
1298 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1299 break;
1300 }
1301 }
1302 read_unlock_bh(&addrconf_hash_lock);
1303 return ifp != NULL;
1304}
7159039a
YH		 1305EXPORT_SYMBOL(ipv6_chk_addr);
1306
1da177e4 1307static
06bfe655
DL		 1308int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1da177e4
LT		 1310{
1311 struct inet6_ifaddr * ifp;
1312 u8 hash = ipv6_addr_hash(addr);
1313
1314 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1315 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1316 continue;
1da177e4
LT		 1317 if (ipv6_addr_equal(&ifp->addr, addr)) {
1318 if (dev == NULL || ifp->idev->dev == dev)
1319 break;
1320 }
1321 }
1322 return ifp != NULL;
1323}
1324
52eeeb84
YH		 1325int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1326{
1327 struct inet6_dev *idev;
1328 struct inet6_ifaddr *ifa;
1329 int onlink;
1330
1331 onlink = 0;
1332 rcu_read_lock();
1333 idev = __in6_dev_get(dev);
1334 if (idev) {
1335 read_lock_bh(&idev->lock);
1336 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1337 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1338 ifa->prefix_len);
1339 if (onlink)
1340 break;
1341 }
1342 read_unlock_bh(&idev->lock);
1343 }
1344 rcu_read_unlock();
1345 return onlink;
1346}
1347
1348EXPORT_SYMBOL(ipv6_chk_prefix);
1349
9acd9f3a 1350struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1351 struct net_device *dev, int strict)
1da177e4
LT		 1352{
1353 struct inet6_ifaddr * ifp;
1354 u8 hash = ipv6_addr_hash(addr);
1355
1356 read_lock_bh(&addrconf_hash_lock);
1357 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1358 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1359 continue;
1da177e4
LT		 1360 if (ipv6_addr_equal(&ifp->addr, addr)) {
1361 if (dev == NULL || ifp->idev->dev == dev ||
1362 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1363 in6_ifa_hold(ifp);
1364 break;
1365 }
1366 }
1367 }
1368 read_unlock_bh(&addrconf_hash_lock);
1369
1370 return ifp;
1371}
1372
1373int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1374{
1375 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1376 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1377 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1378 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1379 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1380 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1381 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1382 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1383
1384 if (!sk2_rcv_saddr && !sk_ipv6only)
1385 return 1;
1386
1387 if (addr_type2 == IPV6_ADDR_ANY &&
1388 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1389 return 1;
1390
1391 if (addr_type == IPV6_ADDR_ANY &&
1392 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1393 return 1;
1394
1395 if (sk2_rcv_saddr6 &&
1396 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1397 return 1;
1398
1399 if (addr_type == IPV6_ADDR_MAPPED &&
1400 !sk2_ipv6only &&
1401 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1402 return 1;
1403
1404 return 0;
1405}
1406
1407/* Gets referenced address, destroys ifaddr */
1408
9f5336e2 1409static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1410{
1da177e4
LT		 1411 if (ifp->flags&IFA_F_PERMANENT) {
1412 spin_lock_bh(&ifp->lock);
1413 addrconf_del_timer(ifp);
1414 ifp->flags |= IFA_F_TENTATIVE;
1415 spin_unlock_bh(&ifp->lock);
1416 in6_ifa_put(ifp);
1417#ifdef CONFIG_IPV6_PRIVACY
1418 } else if (ifp->flags&IFA_F_TEMPORARY) {
1419 struct inet6_ifaddr *ifpub;
1420 spin_lock_bh(&ifp->lock);
1421 ifpub = ifp->ifpub;
1422 if (ifpub) {
1423 in6_ifa_hold(ifpub);
1424 spin_unlock_bh(&ifp->lock);
1425 ipv6_create_tempaddr(ifpub, ifp);
1426 in6_ifa_put(ifpub);
1427 } else {
1428 spin_unlock_bh(&ifp->lock);
1429 }
1430 ipv6_del_addr(ifp);
1431#endif
1432 } else
1433 ipv6_del_addr(ifp);
1434}
1435
3c21edbd
YH		 1436void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1437{
1b34be74 1438 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1439
1440 if (net_ratelimit())
1441 printk(KERN_INFO "%s: IPv6 duplicate address detected!\n",
1442 ifp->idev->dev->name);
1443
1b34be74
YH		 1444 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1445 struct in6_addr addr;
1446
1447 addr.s6_addr32[0] = htonl(0xfe800000);
1448 addr.s6_addr32[1] = 0;
1449
1450 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1451 ipv6_addr_equal(&ifp->addr, &addr)) {
1452 /* DAD failed for link-local based on MAC address */
1453 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1454
1455 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1456 ifp->idev->dev->name);
1b34be74
YH		 1457 }
1458 }
1459
3c21edbd
YH		 1460 addrconf_dad_stop(ifp);
1461}
1da177e4
LT		 1462
1463/* Join to solicited addr multicast group. */
1464
1465void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1466{
1467 struct in6_addr maddr;
1468
1469 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1470 return;
1471
1472 addrconf_addr_solict_mult(addr, &maddr);
1473 ipv6_dev_mc_inc(dev, &maddr);
1474}
1475
1476void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1477{
1478 struct in6_addr maddr;
1479
1480 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1481 return;
1482
1483 addrconf_addr_solict_mult(addr, &maddr);
1484 __ipv6_dev_mc_dec(idev, &maddr);
1485}
1486
20380731 1487static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1488{
1489 struct in6_addr addr;
1490 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1491 if (ipv6_addr_any(&addr))
1492 return;
1493 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1494}
1495
20380731 1496static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1497{
1498 struct in6_addr addr;
1499 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1500 if (ipv6_addr_any(&addr))
1501 return;
1502 __ipv6_dev_ac_dec(ifp->idev, &addr);
1503}
1504
073a8e0e
YH		 1505static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1506{
1507 if (dev->addr_len != ETH_ALEN)
1508 return -1;
1509 memcpy(eui, dev->dev_addr, 3);
1510 memcpy(eui + 5, dev->dev_addr + 3, 3);
1511
1512 /*
1513 * The zSeries OSA network cards can be shared among various
1514 * OS instances, but the OSA cards have only one MAC address.
1515 * This leads to duplicate address conflicts in conjunction
1516 * with IPv6 if more than one instance uses the same card.
1517 *
1518 * The driver for these cards can deliver a unique 16-bit
1519 * identifier for each instance sharing the same card. It is
1520 * placed instead of 0xFFFE in the interface identifier. The
1521 * "u" bit of the interface identifier is not inverted in this
1522 * case. Hence the resulting interface identifier has local
1523 * scope according to RFC2373.
1524 */
1525 if (dev->dev_id) {
1526 eui[3] = (dev->dev_id >> 8) & 0xFF;
1527 eui[4] = dev->dev_id & 0xFF;
1528 } else {
1529 eui[3] = 0xFF;
1530 eui[4] = 0xFE;
1531 eui[0] ^= 2;
1532 }
1533 return 0;
1534}
1535
1536static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1537{
1538 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1539 if (dev->addr_len != ARCNET_ALEN)
1540 return -1;
1541 memset(eui, 0, 7);
1542 eui[7] = *(u8*)dev->dev_addr;
1543 return 0;
1544}
1545
1546static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1547{
1548 if (dev->addr_len != INFINIBAND_ALEN)
1549 return -1;
1550 memcpy(eui, dev->dev_addr + 12, 8);
1551 eui[0] |= 2;
1552 return 0;
1553}
1554
dfd982ba
YH		 1555int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1556{
1557 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1558 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1559 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1560 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1561 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1562 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1563 eui[1] = 0;
1564 eui[2] = 0x5E;
1565 eui[3] = 0xFE;
1566 memcpy(eui + 4, &addr, 4);
1567 return 0;
1568}
1569EXPORT_SYMBOL(__ipv6_isatap_ifid);
1570
1571static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1572{
1573 if (dev->priv_flags & IFF_ISATAP)
1574 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1575 return -1;
1576}
1577
1da177e4
LT		 1578static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1579{
1580 switch (dev->type) {
1581 case ARPHRD_ETHER:
1582 case ARPHRD_FDDI:
1583 case ARPHRD_IEEE802_TR:
073a8e0e 1584 return addrconf_ifid_eui48(eui, dev);
1da177e4 1585 case ARPHRD_ARCNET:
073a8e0e 1586 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1587 case ARPHRD_INFINIBAND:
073a8e0e 1588 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1589 case ARPHRD_SIT:
dfd982ba 1590 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1591 }
1592 return -1;
1593}
1594
1595static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1596{
1597 int err = -1;
1598 struct inet6_ifaddr *ifp;
1599
1600 read_lock_bh(&idev->lock);
1601 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1602 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1603 memcpy(eui, ifp->addr.s6_addr+8, 8);
1604 err = 0;
1605 break;
1606 }
1607 }
1608 read_unlock_bh(&idev->lock);
1609 return err;
1610}
1611
1612#ifdef CONFIG_IPV6_PRIVACY
1613/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1614static int __ipv6_regen_rndid(struct inet6_dev *idev)
1615{
1da177e4 1616regen:
955189ef 1617 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1618 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1619
1620 /*
1621 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1622 * check if generated address is not inappropriate
1623 *
1624 * - Reserved subnet anycast (RFC 2526)
1625 * 11111101 11....11 1xxxxxxx
c7dc89c0 1626 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1627 * 00-00-5E-FE-xx-xx-xx-xx
1628 * - value 0
1629 * - XXX: already assigned to an address on the device
1630 */
1ab1457c 1631 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1632 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1633 (idev->rndid[7]&0x80))
1634 goto regen;
1635 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1636 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1637 goto regen;
1638 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1639 goto regen;
1640 }
1641
1642 return 0;
1643}
1644
1645static void ipv6_regen_rndid(unsigned long data)
1646{
1647 struct inet6_dev *idev = (struct inet6_dev *) data;
1648 unsigned long expires;
1649
8814c4b5 1650 rcu_read_lock_bh();
1da177e4
LT		 1651 write_lock_bh(&idev->lock);
1652
1653 if (idev->dead)
1654 goto out;
1655
1656 if (__ipv6_regen_rndid(idev) < 0)
1657 goto out;
1ab1457c 1658
1da177e4 1659 expires = jiffies +
1ab1457c 1660 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1661 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1662 if (time_before(expires, jiffies)) {
1663 printk(KERN_WARNING
1664 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1665 idev->dev->name);
1666 goto out;
1667 }
1668
1669 if (!mod_timer(&idev->regen_timer, expires))
1670 in6_dev_hold(idev);
1671
1672out:
1673 write_unlock_bh(&idev->lock);
8814c4b5 1674 rcu_read_unlock_bh();
1da177e4
LT		 1675 in6_dev_put(idev);
1676}
1677
1678static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1679 int ret = 0;
1680
1681 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1682 ret = __ipv6_regen_rndid(idev);
1683 return ret;
1684}
1685#endif
1686
1687/*
1688 * Add prefix route.
1689 */
1690
1691static void
1692addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1693 unsigned long expires, u32 flags)
1da177e4 1694{
86872cb5
TG		 1695 struct fib6_config cfg = {
1696 .fc_table = RT6_TABLE_PREFIX,
1697 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1698 .fc_ifindex = dev->ifindex,
1699 .fc_expires = expires,
1700 .fc_dst_len = plen,
1701 .fc_flags = RTF_UP | flags,
c346dca1 1702 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1703 .fc_protocol = RTPROT_KERNEL,
86872cb5 1704 };
1da177e4 1705
86872cb5 1706 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1707
1708 /* Prevent useless cloning on PtP SIT.
1709 This thing is done here expecting that the whole
1710 class of non-broadcast devices need not cloning.
1711 */
0be669bb 1712#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1713 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1714 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1715#endif
1da177e4 1716
86872cb5 1717 ip6_route_add(&cfg);
1da177e4
LT		 1718}
1719
1720/* Create "default" multicast route to the interface */
1721
1722static void addrconf_add_mroute(struct net_device *dev)
1723{
86872cb5
TG		 1724 struct fib6_config cfg = {
1725 .fc_table = RT6_TABLE_LOCAL,
1726 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1727 .fc_ifindex = dev->ifindex,
1728 .fc_dst_len = 8,
1729 .fc_flags = RTF_UP,
c346dca1 1730 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1731 };
1732
1733 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1734
1735 ip6_route_add(&cfg);
1da177e4
LT		 1736}
1737
0be669bb 1738#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1739static void sit_route_add(struct net_device *dev)
1740{
86872cb5
TG		 1741 struct fib6_config cfg = {
1742 .fc_table = RT6_TABLE_MAIN,
1743 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1744 .fc_ifindex = dev->ifindex,
1745 .fc_dst_len = 96,
1746 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1747 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1748 };
1da177e4
LT		 1749
1750 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1751 ip6_route_add(&cfg);
1da177e4 1752}
0be669bb 1753#endif
1da177e4
LT		 1754
1755static void addrconf_add_lroute(struct net_device *dev)
1756{
1757 struct in6_addr addr;
1758
1759 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1760 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1761}
1762
1763static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1764{
1765 struct inet6_dev *idev;
1766
1767 ASSERT_RTNL();
1768
1769 if ((idev = ipv6_find_idev(dev)) == NULL)
1770 return NULL;
1771
1772 /* Add default multicast route */
1773 addrconf_add_mroute(dev);
1774
1775 /* Add link local route */
1776 addrconf_add_lroute(dev);
1777 return idev;
1778}
1779
1780void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781{
1782 struct prefix_info *pinfo;
1783 __u32 valid_lft;
1784 __u32 prefered_lft;
1785 int addr_type;
1da177e4
LT		 1786 struct inet6_dev *in6_dev;
1787
1788 pinfo = (struct prefix_info *) opt;
1ab1457c 1789
1da177e4
LT		 1790 if (len < sizeof(struct prefix_info)) {
1791 ADBG(("addrconf: prefix option too short\n"));
1792 return;
1793 }
1ab1457c 1794
1da177e4
LT		 1795 /*
1796 * Validation checks ([ADDRCONF], page 19)
1797 */
1798
1799 addr_type = ipv6_addr_type(&pinfo->prefix);
1800
1801 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1802 return;
1803
1804 valid_lft = ntohl(pinfo->valid);
1805 prefered_lft = ntohl(pinfo->prefered);
1806
1807 if (prefered_lft > valid_lft) {
1808 if (net_ratelimit())
1809 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1810 return;
1811 }
1812
1813 in6_dev = in6_dev_get(dev);
1814
1815 if (in6_dev == NULL) {
1816 if (net_ratelimit())
1817 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1818 return;
1819 }
1820
1821 /*
1822 * Two things going on here:
1823 * 1) Add routes for on-link prefixes
1824 * 2) Configure prefixes with the auto flag set
1825 */
1826
4bed72e4
YH		 1827 if (pinfo->onlink) {
1828 struct rt6_info *rt;
1829 unsigned long rt_expires;
1830
6f704992
YH		 1831 /* Avoid arithmetic overflow. Really, we could
1832 * save rt_expires in seconds, likely valid_lft,
1833 * but it would require division in fib gc, that it
1834 * not good.
1835 */
4bed72e4
YH		 1836 if (HZ > USER_HZ)
1837 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1838 else
1839 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1840
4bed72e4
YH		 1841 if (addrconf_finite_timeout(rt_expires))
1842 rt_expires *= HZ;
1da177e4 1843
c346dca1 1844 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1845 dev->ifindex, 1);
1da177e4 1846
2b5ead46 1847 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1848 /* Autoconf prefix route */
1849 if (valid_lft == 0) {
1850 ip6_del_rt(rt);
1851 rt = NULL;
4bed72e4 1852 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1853 /* not infinity */
1854 rt->rt6i_expires = jiffies + rt_expires;
1855 rt->rt6i_flags |= RTF_EXPIRES;
1856 } else {
1857 rt->rt6i_flags &= ~RTF_EXPIRES;
1858 rt->rt6i_expires = 0;
1da177e4
LT		 1859 }
1860 } else if (valid_lft) {
6f704992 1861 clock_t expires = 0;
4bed72e4
YH		 1862 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1863 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1864 /* not infinity */
1865 flags |= RTF_EXPIRES;
1866 expires = jiffies_to_clock_t(rt_expires);
1867 }
1da177e4 1868 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1869 dev, expires, flags);
1da177e4
LT		 1870 }
1871 if (rt)
1872 dst_release(&rt->u.dst);
1873 }
1874
1875 /* Try to figure out our local address for this prefix */
1876
1877 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1878 struct inet6_ifaddr * ifp;
1879 struct in6_addr addr;
1880 int create = 0, update_lft = 0;
53b7997f 1881 struct net *net = dev_net(dev);
1da177e4
LT		 1882
1883 if (pinfo->prefix_len == 64) {
1884 memcpy(&addr, &pinfo->prefix, 8);
1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890 goto ok;
1891 }
1892 if (net_ratelimit())
1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 pinfo->prefix_len);
1895 in6_dev_put(in6_dev);
1896 return;
1897
1898ok:
1899
53b7997f 1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1901
1902 if (ifp == NULL && valid_lft) {
1903 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1904 u32 addr_flags = 0;
1905
1906#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1907 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1908 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1909 addr_flags = IFA_F_OPTIMISTIC;
1910#endif
1da177e4
LT		 1911
1912 /* Do not allow to create too much of autoconfigured
1913 * addresses; this would be too easy way to crash kernel.
1914 */
1915 if (!max_addresses ||
1916 ipv6_count_addresses(in6_dev) < max_addresses)
1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1918 addr_type&IPV6_ADDR_SCOPE_MASK,
1919 addr_flags);
1da177e4
LT		 1920
1921 if (!ifp || IS_ERR(ifp)) {
1922 in6_dev_put(in6_dev);
1923 return;
1924 }
1925
1926 update_lft = create = 1;
1927 ifp->cstamp = jiffies;
1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1929 }
1930
1931 if (ifp) {
1932 int flags;
1933 unsigned long now;
1934#ifdef CONFIG_IPV6_PRIVACY
1935 struct inet6_ifaddr *ift;
1936#endif
1937 u32 stored_lft;
1938
1939 /* update lifetime (RFC2462 5.5.3 e) */
1940 spin_lock(&ifp->lock);
1941 now = jiffies;
1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1944 else
1945 stored_lft = 0;
1946 if (!update_lft && stored_lft) {
1947 if (valid_lft > MIN_VALID_LIFETIME ||
1948 valid_lft > stored_lft)
1949 update_lft = 1;
1950 else if (stored_lft <= MIN_VALID_LIFETIME) {
1951 /* valid_lft <= stored_lft is always true */
1952 /* XXX: IPsec */
1953 update_lft = 0;
1954 } else {
1955 valid_lft = MIN_VALID_LIFETIME;
1956 if (valid_lft < prefered_lft)
1957 prefered_lft = valid_lft;
1958 update_lft = 1;
1959 }
1960 }
1961
1962 if (update_lft) {
1963 ifp->valid_lft = valid_lft;
1964 ifp->prefered_lft = prefered_lft;
1965 ifp->tstamp = now;
1966 flags = ifp->flags;
1967 ifp->flags &= ~IFA_F_DEPRECATED;
1968 spin_unlock(&ifp->lock);
1969
1970 if (!(flags&IFA_F_TENTATIVE))
1971 ipv6_ifa_notify(0, ifp);
1972 } else
1973 spin_unlock(&ifp->lock);
1974
1975#ifdef CONFIG_IPV6_PRIVACY
1976 read_lock_bh(&in6_dev->lock);
1977 /* update all temporary addresses in the list */
1978 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1979 /*
1980 * When adjusting the lifetimes of an existing
1981 * temporary address, only lower the lifetimes.
1982 * Implementations must not increase the
1983 * lifetimes of an existing temporary address
1984 * when processing a Prefix Information Option.
1985 */
c6fbfac2
BB		 1986 if (ifp != ift->ifpub)
1987 continue;
1988
1da177e4
LT		 1989 spin_lock(&ift->lock);
1990 flags = ift->flags;
1991 if (ift->valid_lft > valid_lft &&
1992 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1993 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1994 if (ift->prefered_lft > prefered_lft &&
1995 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1996 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1997 spin_unlock(&ift->lock);
1998 if (!(flags&IFA_F_TENTATIVE))
1999 ipv6_ifa_notify(0, ift);
2000 }
2001
2002 if (create && in6_dev->cnf.use_tempaddr > 0) {
2003 /*
2004 * When a new public address is created as described in [ADDRCONF],
2005 * also create a new temporary address.
2006 */
1ab1457c 2007 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2008 ipv6_create_tempaddr(ifp, NULL);
2009 } else {
2010 read_unlock_bh(&in6_dev->lock);
2011 }
2012#endif
2013 in6_ifa_put(ifp);
2014 addrconf_verify(0);
2015 }
2016 }
2017 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2018 in6_dev_put(in6_dev);
2019}
2020
2021/*
2022 * Set destination address.
2023 * Special case for SIT interfaces where we create a new "virtual"
2024 * device.
2025 */
af284937 2026int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2027{
2028 struct in6_ifreq ireq;
2029 struct net_device *dev;
2030 int err = -EINVAL;
2031
2032 rtnl_lock();
2033
2034 err = -EFAULT;
2035 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2036 goto err_exit;
2037
af284937 2038 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2039
2040 err = -ENODEV;
2041 if (dev == NULL)
2042 goto err_exit;
2043
0be669bb 2044#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2045 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2046 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2047 struct ifreq ifr;
1da177e4
LT		 2048 struct ip_tunnel_parm p;
2049
2050 err = -EADDRNOTAVAIL;
2051 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2052 goto err_exit;
2053
2054 memset(&p, 0, sizeof(p));
2055 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2056 p.iph.saddr = 0;
2057 p.iph.version = 4;
2058 p.iph.ihl = 5;
2059 p.iph.protocol = IPPROTO_IPV6;
2060 p.iph.ttl = 64;
d20b3109 2061 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2062
5bc3eb7e
SH		 2063 if (ops->ndo_do_ioctl) {
2064 mm_segment_t oldfs = get_fs();
2065
2066 set_fs(KERNEL_DS);
2067 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2068 set_fs(oldfs);
2069 } else
2070 err = -EOPNOTSUPP;
1da177e4
LT		 2071
2072 if (err == 0) {
2073 err = -ENOBUFS;
af284937
DL		 2074 dev = __dev_get_by_name(net, p.name);
2075 if (!dev)
1da177e4
LT		 2076 goto err_exit;
2077 err = dev_open(dev);
2078 }
2079 }
0be669bb 2080#endif
1da177e4
LT		 2081
2082err_exit:
2083 rtnl_unlock();
2084 return err;
2085}
2086
2087/*
2088 * Manual configuration of address on an interface
2089 */
af284937 2090static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2091 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2092 __u32 valid_lft)
1da177e4
LT		 2093{
2094 struct inet6_ifaddr *ifp;
2095 struct inet6_dev *idev;
2096 struct net_device *dev;
2097 int scope;
6f704992
YH		 2098 u32 flags;
2099 clock_t expires;
4bed72e4 2100 unsigned long timeout;
1da177e4
LT		 2101
2102 ASSERT_RTNL();
1ab1457c 2103
24ef0da7
TG		 2104 if (plen > 128)
2105 return -EINVAL;
2106
0778769d
NT		 2107 /* check the lifetime */
2108 if (!valid_lft || prefered_lft > valid_lft)
2109 return -EINVAL;
2110
af284937
DL		 2111 dev = __dev_get_by_index(net, ifindex);
2112 if (!dev)
1da177e4 2113 return -ENODEV;
1ab1457c 2114
1da177e4
LT		 2115 if ((idev = addrconf_add_dev(dev)) == NULL)
2116 return -ENOBUFS;
2117
2118 scope = ipv6_addr_scope(pfx);
2119
4bed72e4
YH		 2120 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2121 if (addrconf_finite_timeout(timeout)) {
2122 expires = jiffies_to_clock_t(timeout * HZ);
2123 valid_lft = timeout;
6f704992 2124 flags = RTF_EXPIRES;
4bed72e4
YH		 2125 } else {
2126 expires = 0;
2127 flags = 0;
2128 ifa_flags |= IFA_F_PERMANENT;
6f704992 2129 }
0778769d 2130
4bed72e4
YH		 2131 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2132 if (addrconf_finite_timeout(timeout)) {
2133 if (timeout == 0)
2134 ifa_flags |= IFA_F_DEPRECATED;
2135 prefered_lft = timeout;
2136 }
0778769d
NT		 2137
2138 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2139
1da177e4 2140 if (!IS_ERR(ifp)) {
06aebfb7 2141 spin_lock_bh(&ifp->lock);
0778769d
NT		 2142 ifp->valid_lft = valid_lft;
2143 ifp->prefered_lft = prefered_lft;
2144 ifp->tstamp = jiffies;
06aebfb7 2145 spin_unlock_bh(&ifp->lock);
0778769d 2146
46d48046 2147 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2148 expires, flags);
95c385b4
NH		 2149 /*
2150 * Note that section 3.1 of RFC 4429 indicates
2151 * that the Optimistic flag should not be set for
2152 * manually configured addresses
2153 */
1da177e4
LT		 2154 addrconf_dad_start(ifp, 0);
2155 in6_ifa_put(ifp);
0778769d 2156 addrconf_verify(0);
1da177e4
LT		 2157 return 0;
2158 }
2159
2160 return PTR_ERR(ifp);
2161}
2162
af284937 2163static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2164 unsigned int plen)
1da177e4
LT		 2165{
2166 struct inet6_ifaddr *ifp;
2167 struct inet6_dev *idev;
2168 struct net_device *dev;
1ab1457c 2169
24ef0da7
TG		 2170 if (plen > 128)
2171 return -EINVAL;
2172
af284937
DL		 2173 dev = __dev_get_by_index(net, ifindex);
2174 if (!dev)
1da177e4
LT		 2175 return -ENODEV;
2176
2177 if ((idev = __in6_dev_get(dev)) == NULL)
2178 return -ENXIO;
2179
2180 read_lock_bh(&idev->lock);
2181 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2182 if (ifp->prefix_len == plen &&
2183 ipv6_addr_equal(pfx, &ifp->addr)) {
2184 in6_ifa_hold(ifp);
2185 read_unlock_bh(&idev->lock);
1ab1457c 2186
1da177e4
LT		 2187 ipv6_del_addr(ifp);
2188
2189 /* If the last address is deleted administratively,
2190 disable IPv6 on this interface.
2191 */
2192 if (idev->addr_list == NULL)
2193 addrconf_ifdown(idev->dev, 1);
2194 return 0;
2195 }
2196 }
2197 read_unlock_bh(&idev->lock);
2198 return -EADDRNOTAVAIL;
2199}
2200
2201
af284937 2202int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2203{
2204 struct in6_ifreq ireq;
2205 int err;
1ab1457c 2206
1da177e4
LT		 2207 if (!capable(CAP_NET_ADMIN))
2208 return -EPERM;
1ab1457c 2209
1da177e4
LT		 2210 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2211 return -EFAULT;
2212
2213 rtnl_lock();
af284937
DL		 2214 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2215 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2216 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2217 rtnl_unlock();
2218 return err;
2219}
2220
af284937 2221int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2222{
2223 struct in6_ifreq ireq;
2224 int err;
1ab1457c 2225
1da177e4
LT		 2226 if (!capable(CAP_NET_ADMIN))
2227 return -EPERM;
2228
2229 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2230 return -EFAULT;
2231
2232 rtnl_lock();
af284937
DL		 2233 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2234 ireq.ifr6_prefixlen);
1da177e4
LT		 2235 rtnl_unlock();
2236 return err;
2237}
2238
b5f348e5
IJ		 2239static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2240 int plen, int scope)
2241{
2242 struct inet6_ifaddr *ifp;
2243
2244 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2245 if (!IS_ERR(ifp)) {
2246 spin_lock_bh(&ifp->lock);
2247 ifp->flags &= ~IFA_F_TENTATIVE;
2248 spin_unlock_bh(&ifp->lock);
2249 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2250 in6_ifa_put(ifp);
2251 }
2252}
2253
0be669bb 2254#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2255static void sit_add_v4_addrs(struct inet6_dev *idev)
2256{
1da177e4
LT		 2257 struct in6_addr addr;
2258 struct net_device *dev;
c346dca1 2259 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2260 int scope;
2261
2262 ASSERT_RTNL();
2263
2264 memset(&addr, 0, sizeof(struct in6_addr));
2265 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2266
2267 if (idev->dev->flags&IFF_POINTOPOINT) {
2268 addr.s6_addr32[0] = htonl(0xfe800000);
2269 scope = IFA_LINK;
2270 } else {
2271 scope = IPV6_ADDR_COMPATv4;
2272 }
2273
2274 if (addr.s6_addr32[3]) {
b5f348e5 2275 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2276 return;
2277 }
2278
6fda7350 2279 for_each_netdev(net, dev) {
e5ed6399 2280 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2281 if (in_dev && (dev->flags & IFF_UP)) {
2282 struct in_ifaddr * ifa;
2283
2284 int flag = scope;
2285
2286 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2287 int plen;
2288
2289 addr.s6_addr32[3] = ifa->ifa_local;
2290
2291 if (ifa->ifa_scope == RT_SCOPE_LINK)
2292 continue;
2293 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2294 if (idev->dev->flags&IFF_POINTOPOINT)
2295 continue;
2296 flag |= IFA_HOST;
2297 }
2298 if (idev->dev->flags&IFF_POINTOPOINT)
2299 plen = 64;
2300 else
2301 plen = 96;
2302
b5f348e5 2303 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2304 }
2305 }
1ab1457c 2306 }
1da177e4 2307}
0be669bb 2308#endif
1da177e4
LT		 2309
2310static void init_loopback(struct net_device *dev)
2311{
2312 struct inet6_dev *idev;
1da177e4
LT		 2313
2314 /* ::1 */
2315
2316 ASSERT_RTNL();
2317
2318 if ((idev = ipv6_find_idev(dev)) == NULL) {
2319 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2320 return;
2321 }
2322
b5f348e5 2323 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2324}
2325
2326static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2327{
2328 struct inet6_ifaddr * ifp;
95c385b4
NH		 2329 u32 addr_flags = IFA_F_PERMANENT;
2330
2331#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2332 if (idev->cnf.optimistic_dad &&
702beb87 2333 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2334 addr_flags |= IFA_F_OPTIMISTIC;
2335#endif
1da177e4 2336
95c385b4
NH		 2337
2338 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2339 if (!IS_ERR(ifp)) {
46d48046 2340 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2341 addrconf_dad_start(ifp, 0);
2342 in6_ifa_put(ifp);
2343 }
2344}
2345
2346static void addrconf_dev_config(struct net_device *dev)
2347{
2348 struct in6_addr addr;
2349 struct inet6_dev * idev;
2350
2351 ASSERT_RTNL();
2352
74235a25
HX		 2353 if ((dev->type != ARPHRD_ETHER) &&
2354 (dev->type != ARPHRD_FDDI) &&
2355 (dev->type != ARPHRD_IEEE802_TR) &&
2356 (dev->type != ARPHRD_ARCNET) &&
2357 (dev->type != ARPHRD_INFINIBAND)) {
2358 /* Alas, we support only Ethernet autoconfiguration. */
2359 return;
2360 }
2361
1da177e4
LT		 2362 idev = addrconf_add_dev(dev);
2363 if (idev == NULL)
2364 return;
2365
2366 memset(&addr, 0, sizeof(struct in6_addr));
2367 addr.s6_addr32[0] = htonl(0xFE800000);
2368
2369 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2370 addrconf_add_linklocal(idev, &addr);
2371}
2372
0be669bb 2373#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2374static void addrconf_sit_config(struct net_device *dev)
2375{
2376 struct inet6_dev *idev;
2377
2378 ASSERT_RTNL();
2379
1ab1457c
YH		 2380 /*
2381 * Configure the tunnel with one of our IPv4
2382 * addresses... we should configure all of
1da177e4
LT		 2383 * our v4 addrs in the tunnel
2384 */
2385
2386 if ((idev = ipv6_find_idev(dev)) == NULL) {
2387 printk(KERN_DEBUG "init sit: add_dev failed\n");
2388 return;
2389 }
2390
c7dc89c0
FT		 2391 if (dev->priv_flags & IFF_ISATAP) {
2392 struct in6_addr addr;
2393
2394 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2395 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2396 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2397 addrconf_add_linklocal(idev, &addr);
2398 return;
2399 }
2400
1da177e4
LT		 2401 sit_add_v4_addrs(idev);
2402
2403 if (dev->flags&IFF_POINTOPOINT) {
2404 addrconf_add_mroute(dev);
2405 addrconf_add_lroute(dev);
2406 } else
2407 sit_route_add(dev);
2408}
0be669bb 2409#endif
1da177e4
LT		 2410
2411static inline int
2412ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2413{
2414 struct in6_addr lladdr;
2415
95c385b4 2416 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2417 addrconf_add_linklocal(idev, &lladdr);
2418 return 0;
2419 }
2420 return -1;
2421}
2422
2423static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2424{
2425 struct net_device *link_dev;
c346dca1 2426 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2427
2428 /* first try to inherit the link-local address from the link device */
2429 if (idev->dev->iflink &&
6fda7350 2430 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2431 if (!ipv6_inherit_linklocal(idev, link_dev))
2432 return;
2433 }
2434 /* then try to inherit it from any device */
6fda7350 2435 for_each_netdev(net, link_dev) {
1da177e4
LT		 2436 if (!ipv6_inherit_linklocal(idev, link_dev))
2437 return;
2438 }
2439 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2440}
2441
2442/*
2443 * Autoconfigure tunnel with a link-local address so routing protocols,
2444 * DHCPv6, MLD etc. can be run over the virtual link
2445 */
2446
2447static void addrconf_ip6_tnl_config(struct net_device *dev)
2448{
2449 struct inet6_dev *idev;
2450
2451 ASSERT_RTNL();
2452
2453 if ((idev = addrconf_add_dev(dev)) == NULL) {
2454 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2455 return;
2456 }
2457 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2458}
2459
1ab1457c 2460static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2461 void * data)
2462{
2463 struct net_device *dev = (struct net_device *) data;
74235a25 2464 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2465 int run_pending = 0;
b217d616 2466 int err;
1da177e4
LT		 2467
2468 switch(event) {
45ba9dd2 2469 case NETDEV_REGISTER:
74235a25 2470 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2471 idev = ipv6_add_dev(dev);
2472 if (!idev)
b217d616 2473 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2474 }
2475 break;
1da177e4 2476 case NETDEV_UP:
3c21edbd 2477 case NETDEV_CHANGE:
c2edacf8
JV		 2478 if (dev->flags & IFF_SLAVE)
2479 break;
2480
3c21edbd 2481 if (event == NETDEV_UP) {
f24e3d65 2482 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2483 /* device is not ready yet. */
2484 printk(KERN_INFO
2485 "ADDRCONF(NETDEV_UP): %s: "
2486 "link is not ready\n",
2487 dev->name);
2488 break;
2489 }
99081049 2490
d31c7b8f
EP		 2491 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2492 idev = ipv6_add_dev(dev);
2493
e3ec6cfc 2494 if (idev) {
99081049 2495 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2496 run_pending = 1;
2497 }
3c21edbd 2498 } else {
f24e3d65 2499 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2500 /* device is still not ready. */
2501 break;
2502 }
2503
2504 if (idev) {
2505 if (idev->if_flags & IF_READY) {
2506 /* device is already configured. */
2507 break;
2508 }
2509 idev->if_flags |= IF_READY;
2510 }
2511
2512 printk(KERN_INFO
2513 "ADDRCONF(NETDEV_CHANGE): %s: "
2514 "link becomes ready\n",
2515 dev->name);
2516
c5e33bdd 2517 run_pending = 1;
3c21edbd
YH		 2518 }
2519
1da177e4 2520 switch(dev->type) {
0be669bb 2521#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2522 case ARPHRD_SIT:
2523 addrconf_sit_config(dev);
2524 break;
0be669bb 2525#endif
1da177e4
LT		 2526 case ARPHRD_TUNNEL6:
2527 addrconf_ip6_tnl_config(dev);
2528 break;
2529 case ARPHRD_LOOPBACK:
2530 init_loopback(dev);
2531 break;
2532
2533 default:
2534 addrconf_dev_config(dev);
2535 break;
3ff50b79 2536 }
1da177e4 2537 if (idev) {
c5e33bdd
YH		 2538 if (run_pending)
2539 addrconf_dad_run(idev);
2540
1da177e4
LT		 2541 /* If the MTU changed during the interface down, when the
2542 interface up, the changed MTU must be reflected in the
2543 idev as well as routers.
2544 */
2545 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2546 rt6_mtu_change(dev, dev->mtu);
2547 idev->cnf.mtu6 = dev->mtu;
2548 }
2549 idev->tstamp = jiffies;
2550 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2551 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2552 stop IPv6 on this interface.
2553 */
2554 if (dev->mtu < IPV6_MIN_MTU)
2555 addrconf_ifdown(dev, event != NETDEV_DOWN);
2556 }
2557 break;
2558
2559 case NETDEV_CHANGEMTU:
d31c7b8f 2560 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2561 rt6_mtu_change(dev, dev->mtu);
2562 idev->cnf.mtu6 = dev->mtu;
2563 break;
2564 }
2565
d31c7b8f
EP		 2566 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2567 idev = ipv6_add_dev(dev);
2568 if (idev)
2569 break;
2570 }
2571
1da177e4
LT		 2572 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2573
2574 case NETDEV_DOWN:
2575 case NETDEV_UNREGISTER:
2576 /*
2577 * Remove all addresses from this interface.
2578 */
2579 addrconf_ifdown(dev, event != NETDEV_DOWN);
2580 break;
3c21edbd 2581
1da177e4 2582 case NETDEV_CHANGENAME:
1da177e4 2583 if (idev) {
5632c515 2584 snmp6_unregister_dev(idev);
408c4768 2585 addrconf_sysctl_unregister(idev);
f52295a9 2586 addrconf_sysctl_register(idev);
b217d616
HX		 2587 err = snmp6_register_dev(idev);
2588 if (err)
2589 return notifier_from_errno(err);
5632c515 2590 }
1da177e4 2591 break;
3ff50b79 2592 }
1da177e4
LT		 2593
2594 return NOTIFY_OK;
2595}
2596
2597/*
2598 * addrconf module should be notified of a device going up
2599 */
2600static struct notifier_block ipv6_dev_notf = {
2601 .notifier_call = addrconf_notify,
2602 .priority = 0
2603};
2604
2605static int addrconf_ifdown(struct net_device *dev, int how)
2606{
2607 struct inet6_dev *idev;
2608 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2609 struct net *net = dev_net(dev);
1da177e4
LT		 2610 int i;
2611
2612 ASSERT_RTNL();
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 }
2835 spin_lock_bh(&ifp->lock);
2836 if (ifp->probes == 0) {
2837 /*
2838 * DAD was successful
2839 */
2840
95c385b4 2841 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2842 spin_unlock_bh(&ifp->lock);
2843 read_unlock_bh(&idev->lock);
2844
2845 addrconf_dad_completed(ifp);
2846
2847 goto out;
2848 }
2849
2850 ifp->probes--;
2851 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2852 spin_unlock_bh(&ifp->lock);
2853 read_unlock_bh(&idev->lock);
2854
2855 /* send a neighbour solicitation for our addr */
1da177e4 2856 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2857 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2858out:
2859 in6_ifa_put(ifp);
2860}
2861
2862static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2863{
2864 struct net_device * dev = ifp->idev->dev;
2865
2866 /*
2867 * Configure the address for reception. Now it is valid.
2868 */
2869
2870 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2871
2872 /* If added prefix is link local and forwarding is off,
2873 start sending router solicitations.
2874 */
2875
2876 if (ifp->idev->cnf.forwarding == 0 &&
2877 ifp->idev->cnf.rtr_solicits > 0 &&
2878 (dev->flags&IFF_LOOPBACK) == 0 &&
2879 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2880 /*
2881 * If a host as already performed a random delay
2882 * [...] as part of DAD [...] there is no need
2883 * to delay again before sending the first RS
2884 */
f3ee4010 2885 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2886
2887 spin_lock_bh(&ifp->lock);
2888 ifp->probes = 1;
2889 ifp->idev->if_flags |= IF_RS_SENT;
2890 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2891 spin_unlock_bh(&ifp->lock);
2892 }
2893}
2894
c5e33bdd
YH		 2895static void addrconf_dad_run(struct inet6_dev *idev) {
2896 struct inet6_ifaddr *ifp;
2897
2898 read_lock_bh(&idev->lock);
2899 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2900 spin_lock_bh(&ifp->lock);
2901 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2902 spin_unlock_bh(&ifp->lock);
2903 continue;
2904 }
2905 spin_unlock_bh(&ifp->lock);
2906 addrconf_dad_kick(ifp);
2907 }
2908 read_unlock_bh(&idev->lock);
2909}
2910
1da177e4
LT		 2911#ifdef CONFIG_PROC_FS
2912struct if6_iter_state {
3c40090a 2913 struct seq_net_private p;
1da177e4
LT		 2914 int bucket;
2915};
2916
2917static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2918{
2919 struct inet6_ifaddr *ifa = NULL;
2920 struct if6_iter_state *state = seq->private;
1218854a 2921 struct net *net = seq_file_net(seq);
1da177e4
LT		 2922
2923 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2924 ifa = inet6_addr_lst[state->bucket];
3c40090a 2925
878628fb 2926 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2927 ifa = ifa->lst_next;
1da177e4
LT		 2928 if (ifa)
2929 break;
2930 }
2931 return ifa;
2932}
2933
2934static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2935{
2936 struct if6_iter_state *state = seq->private;
1218854a 2937 struct net *net = seq_file_net(seq);
1da177e4
LT		 2938
2939 ifa = ifa->lst_next;
2940try_again:
3c40090a 2941 if (ifa) {
878628fb 2942 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2943 ifa = ifa->lst_next;
2944 goto try_again;
2945 }
2946 }
2947
1da177e4
LT		 2948 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2949 ifa = inet6_addr_lst[state->bucket];
2950 goto try_again;
2951 }
3c40090a 2952
1da177e4
LT		 2953 return ifa;
2954}
2955
2956static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2957{
2958 struct inet6_ifaddr *ifa = if6_get_first(seq);
2959
2960 if (ifa)
2961 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2962 --pos;
2963 return pos ? NULL : ifa;
2964}
2965
2966static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2967 __acquires(addrconf_hash_lock)
1da177e4
LT		 2968{
2969 read_lock_bh(&addrconf_hash_lock);
2970 return if6_get_idx(seq, *pos);
2971}
2972
2973static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2974{
2975 struct inet6_ifaddr *ifa;
2976
2977 ifa = if6_get_next(seq, v);
2978 ++*pos;
2979 return ifa;
2980}
2981
2982static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2983 __releases(addrconf_hash_lock)
1da177e4
LT		 2984{
2985 read_unlock_bh(&addrconf_hash_lock);
2986}
2987
2988static int if6_seq_show(struct seq_file *seq, void *v)
2989{
2990 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 2991 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 2992 &ifp->addr,
1da177e4
LT		 2993 ifp->idev->dev->ifindex,
2994 ifp->prefix_len,
2995 ifp->scope,
2996 ifp->flags,
2997 ifp->idev->dev->name);
2998 return 0;
2999}
3000
56b3d975 3001static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3002 .start = if6_seq_start,
3003 .next = if6_seq_next,
3004 .show = if6_seq_show,
3005 .stop = if6_seq_stop,
3006};
3007
3008static int if6_seq_open(struct inode *inode, struct file *file)
3009{
3c40090a
DL		 3010 return seq_open_net(inode, file, &if6_seq_ops,
3011 sizeof(struct if6_iter_state));
1da177e4
LT		 3012}
3013
9a32144e 3014static const struct file_operations if6_fops = {
1da177e4
LT		 3015 .owner = THIS_MODULE,
3016 .open = if6_seq_open,
3017 .read = seq_read,
3018 .llseek = seq_lseek,
3c40090a 3019 .release = seq_release_net,
1da177e4
LT		 3020};
3021
3c40090a 3022static int if6_proc_net_init(struct net *net)
1da177e4 3023{
3c40090a 3024 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3025 return -ENOMEM;
3026 return 0;
3027}
3028
3c40090a
DL		 3029static void if6_proc_net_exit(struct net *net)
3030{
3031 proc_net_remove(net, "if_inet6");
3032}
3033
3034static struct pernet_operations if6_proc_net_ops = {
3035 .init = if6_proc_net_init,
3036 .exit = if6_proc_net_exit,
3037};
3038
3039int __init if6_proc_init(void)
3040{
3041 return register_pernet_subsys(&if6_proc_net_ops);
3042}
3043
1da177e4
LT		 3044void if6_proc_exit(void)
3045{
3c40090a 3046 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3047}
3048#endif /* CONFIG_PROC_FS */
3049
59fbb3a6 3050#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3051/* Check if address is a home address configured on any interface. */
389f6612 3052int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3053{
3054 int ret = 0;
3055 struct inet6_ifaddr * ifp;
3056 u8 hash = ipv6_addr_hash(addr);
3057 read_lock_bh(&addrconf_hash_lock);
3058 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3059 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3060 continue;
caad295f 3061 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3062 (ifp->flags & IFA_F_HOMEADDRESS)) {
3063 ret = 1;
3064 break;
3065 }
3066 }
3067 read_unlock_bh(&addrconf_hash_lock);
3068 return ret;
3069}
3070#endif
3071
1da177e4
LT		 3072/*
3073 * Periodic address status verification
3074 */
3075
3076static void addrconf_verify(unsigned long foo)
3077{
3078 struct inet6_ifaddr *ifp;
3079 unsigned long now, next;
3080 int i;
3081
3082 spin_lock_bh(&addrconf_verify_lock);
3083 now = jiffies;
3084 next = now + ADDR_CHECK_FREQUENCY;
3085
3086 del_timer(&addr_chk_timer);
3087
3088 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3089
3090restart:
5d5780df 3091 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3092 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3093 unsigned long age;
3094#ifdef CONFIG_IPV6_PRIVACY
3095 unsigned long regen_advance;
3096#endif
3097
3098 if (ifp->flags & IFA_F_PERMANENT)
3099 continue;
3100
3101 spin_lock(&ifp->lock);
3102 age = (now - ifp->tstamp) / HZ;
3103
3104#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3105 regen_advance = ifp->idev->cnf.regen_max_retry *
3106 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3107 ifp->idev->nd_parms->retrans_time / HZ;
3108#endif
3109
8f27ebb9
YH		 3110 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3111 age >= ifp->valid_lft) {
1da177e4
LT		 3112 spin_unlock(&ifp->lock);
3113 in6_ifa_hold(ifp);
5d5780df 3114 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3115 ipv6_del_addr(ifp);
3116 goto restart;
8f27ebb9
YH		 3117 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3118 spin_unlock(&ifp->lock);
3119 continue;
1da177e4
LT		 3120 } else if (age >= ifp->prefered_lft) {
3121 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3122 int deprecate = 0;
3123
3124 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3125 deprecate = 1;
3126 ifp->flags |= IFA_F_DEPRECATED;
3127 }
3128
3129 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3130 next = ifp->tstamp + ifp->valid_lft * HZ;
3131
3132 spin_unlock(&ifp->lock);
3133
3134 if (deprecate) {
3135 in6_ifa_hold(ifp);
5d5780df 3136 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3137
3138 ipv6_ifa_notify(0, ifp);
3139 in6_ifa_put(ifp);
3140 goto restart;
3141 }
3142#ifdef CONFIG_IPV6_PRIVACY
3143 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3144 !(ifp->flags&IFA_F_TENTATIVE)) {
3145 if (age >= ifp->prefered_lft - regen_advance) {
3146 struct inet6_ifaddr *ifpub = ifp->ifpub;
3147 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3148 next = ifp->tstamp + ifp->prefered_lft * HZ;
3149 if (!ifp->regen_count && ifpub) {
3150 ifp->regen_count++;
3151 in6_ifa_hold(ifp);
3152 in6_ifa_hold(ifpub);
3153 spin_unlock(&ifp->lock);
5d5780df 3154 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3155 spin_lock(&ifpub->lock);
3156 ifpub->regen_count = 0;
3157 spin_unlock(&ifpub->lock);
1da177e4
LT		 3158 ipv6_create_tempaddr(ifpub, ifp);
3159 in6_ifa_put(ifpub);
3160 in6_ifa_put(ifp);
3161 goto restart;
3162 }
3163 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3164 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3165 spin_unlock(&ifp->lock);
3166#endif
3167 } else {
3168 /* ifp->prefered_lft <= ifp->valid_lft */
3169 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3170 next = ifp->tstamp + ifp->prefered_lft * HZ;
3171 spin_unlock(&ifp->lock);
3172 }
3173 }
5d5780df 3174 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3175 }
3176
3177 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3178 add_timer(&addr_chk_timer);
3179 spin_unlock_bh(&addrconf_verify_lock);
3180}
3181
461d8837
TG		 3182static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3183{
3184 struct in6_addr *pfx = NULL;
3185
3186 if (addr)
3187 pfx = nla_data(addr);
3188
3189 if (local) {
3190 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3191 pfx = NULL;
3192 else
3193 pfx = nla_data(local);
3194 }
3195
3196 return pfx;
3197}
3198
ef7c79ed 3199static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3200 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3201 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3202 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3203};
3204
1da177e4
LT		 3205static int
3206inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3207{
3b1e0a65 3208 struct net *net = sock_net(skb->sk);
b933f716
TG		 3209 struct ifaddrmsg *ifm;
3210 struct nlattr *tb[IFA_MAX+1];
1da177e4 3211 struct in6_addr *pfx;
b933f716 3212 int err;
1da177e4 3213
b933f716
TG		 3214 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3215 if (err < 0)
3216 return err;
3217
3218 ifm = nlmsg_data(nlh);
3219 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3220 if (pfx == NULL)
3221 return -EINVAL;
3222
af284937 3223 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3224}
3225
55ebaef1
NT		 3226static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3227 u32 prefered_lft, u32 valid_lft)
081bba5b 3228{
6f704992
YH		 3229 u32 flags;
3230 clock_t expires;
4bed72e4 3231 unsigned long timeout;
46d48046 3232
081bba5b
NT		 3233 if (!valid_lft || (prefered_lft > valid_lft))
3234 return -EINVAL;
3235
4bed72e4
YH		 3236 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3237 if (addrconf_finite_timeout(timeout)) {
3238 expires = jiffies_to_clock_t(timeout * HZ);
3239 valid_lft = timeout;
6f704992 3240 flags = RTF_EXPIRES;
4bed72e4
YH		 3241 } else {
3242 expires = 0;
3243 flags = 0;
3244 ifa_flags |= IFA_F_PERMANENT;
6f704992 3245 }
081bba5b 3246
4bed72e4
YH		 3247 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3248 if (addrconf_finite_timeout(timeout)) {
3249 if (timeout == 0)
3250 ifa_flags |= IFA_F_DEPRECATED;
3251 prefered_lft = timeout;
3252 }
081bba5b
NT		 3253
3254 spin_lock_bh(&ifp->lock);
3b9f9a1c 3255 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3256 ifp->tstamp = jiffies;
3257 ifp->valid_lft = valid_lft;
3258 ifp->prefered_lft = prefered_lft;
3259
3260 spin_unlock_bh(&ifp->lock);
3261 if (!(ifp->flags&IFA_F_TENTATIVE))
3262 ipv6_ifa_notify(0, ifp);
081bba5b 3263
46d48046 3264 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3265 expires, flags);
081bba5b
NT		 3266 addrconf_verify(0);
3267
3268 return 0;
3269}
3270
1da177e4
LT		 3271static int
3272inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3273{
3b1e0a65 3274 struct net *net = sock_net(skb->sk);
461d8837
TG		 3275 struct ifaddrmsg *ifm;
3276 struct nlattr *tb[IFA_MAX+1];
1da177e4 3277 struct in6_addr *pfx;
7198f8ce
TG		 3278 struct inet6_ifaddr *ifa;
3279 struct net_device *dev;
55ebaef1
NT		 3280 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3281 u8 ifa_flags;
461d8837 3282 int err;
1da177e4 3283
461d8837
TG		 3284 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3285 if (err < 0)
3286 return err;
3287
3288 ifm = nlmsg_data(nlh);
3289 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3290 if (pfx == NULL)
3291 return -EINVAL;
3292
461d8837 3293 if (tb[IFA_CACHEINFO]) {
0778769d 3294 struct ifa_cacheinfo *ci;
461d8837
TG		 3295
3296 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3297 valid_lft = ci->ifa_valid;
461d8837
TG		 3298 preferred_lft = ci->ifa_prefered;
3299 } else {
3300 preferred_lft = INFINITY_LIFE_TIME;
3301 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3302 }
3303
af284937 3304 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3305 if (dev == NULL)
3306 return -ENODEV;
3307
55ebaef1 3308 /* We ignore other flags so far. */
3b9f9a1c 3309 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3310
1cab3da6 3311 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3312 if (ifa == NULL) {
3313 /*
3314 * It would be best to check for !NLM_F_CREATE here but
3315 * userspace alreay relies on not having to provide this.
3316 */
af284937
DL		 3317 return inet6_addr_add(net, ifm->ifa_index, pfx,
3318 ifm->ifa_prefixlen, ifa_flags,
3319 preferred_lft, valid_lft);
081bba5b
NT		 3320 }
3321
7198f8ce
TG		 3322 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3323 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3324 err = -EEXIST;
3325 else
55ebaef1 3326 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3327
3328 in6_ifa_put(ifa);
3329
3330 return err;
1da177e4
LT		 3331}
3332
101bb229
TG		 3333static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3334 u8 scope, int ifindex)
3335{
3336 struct ifaddrmsg *ifm;
3337
3338 ifm = nlmsg_data(nlh);
3339 ifm->ifa_family = AF_INET6;
3340 ifm->ifa_prefixlen = prefixlen;
3341 ifm->ifa_flags = flags;
3342 ifm->ifa_scope = scope;
3343 ifm->ifa_index = ifindex;
3344}
3345
85486af0
TG		 3346static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3347 unsigned long tstamp, u32 preferred, u32 valid)
3348{
3349 struct ifa_cacheinfo ci;
3350
3351 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3352 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3353 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3354 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3355 ci.ifa_prefered = preferred;
3356 ci.ifa_valid = valid;
3357
3358 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3359}
3360
101bb229
TG		 3361static inline int rt_scope(int ifa_scope)
3362{
3363 if (ifa_scope & IFA_HOST)
3364 return RT_SCOPE_HOST;
3365 else if (ifa_scope & IFA_LINK)
3366 return RT_SCOPE_LINK;
3367 else if (ifa_scope & IFA_SITE)
3368 return RT_SCOPE_SITE;
3369 else
3370 return RT_SCOPE_UNIVERSE;
3371}
3372
0ab6803b
TG		 3373static inline int inet6_ifaddr_msgsize(void)
3374{
339bf98f
TG		 3375 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3376 + nla_total_size(16) /* IFA_ADDRESS */
3377 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3378}
c5396a31 3379
1da177e4 3380static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3381 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3382{
1da177e4 3383 struct nlmsghdr *nlh;
85486af0 3384 u32 preferred, valid;
1da177e4 3385
0ab6803b
TG		 3386 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3387 if (nlh == NULL)
26932566 3388 return -EMSGSIZE;
0ab6803b 3389
101bb229
TG		 3390 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3391 ifa->idev->dev->ifindex);
3392
1da177e4 3393 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3394 preferred = ifa->prefered_lft;
3395 valid = ifa->valid_lft;
3396 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3397 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3398 preferred -= tval;
3399 if (valid != INFINITY_LIFE_TIME)
3400 valid -= tval;
1da177e4
LT		 3401 }
3402 } else {
85486af0
TG		 3403 preferred = INFINITY_LIFE_TIME;
3404 valid = INFINITY_LIFE_TIME;
3405 }
3406
0ab6803b 3407 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3408 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3409 nlmsg_cancel(skb, nlh);
3410 return -EMSGSIZE;
3411 }
1da177e4 3412
0ab6803b 3413 return nlmsg_end(skb, nlh);
1da177e4
LT		 3414}
3415
3416static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3417 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3418{
1da177e4 3419 struct nlmsghdr *nlh;
101bb229
TG		 3420 u8 scope = RT_SCOPE_UNIVERSE;
3421 int ifindex = ifmca->idev->dev->ifindex;
3422
3423 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3424 scope = RT_SCOPE_SITE;
1da177e4 3425
0ab6803b
TG		 3426 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3427 if (nlh == NULL)
26932566 3428 return -EMSGSIZE;
85486af0 3429
0ab6803b
TG		 3430 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3431 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3432 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3433 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3434 nlmsg_cancel(skb, nlh);
3435 return -EMSGSIZE;
3436 }
85486af0 3437
0ab6803b 3438 return nlmsg_end(skb, nlh);
1da177e4
LT		 3439}
3440
3441static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3442 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3443{
1da177e4 3444 struct nlmsghdr *nlh;
101bb229
TG		 3445 u8 scope = RT_SCOPE_UNIVERSE;
3446 int ifindex = ifaca->aca_idev->dev->ifindex;
3447
3448 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3449 scope = RT_SCOPE_SITE;
1da177e4 3450
0ab6803b
TG		 3451 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3452 if (nlh == NULL)
26932566 3453 return -EMSGSIZE;
85486af0 3454
0ab6803b
TG		 3455 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3456 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3457 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3458 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3459 nlmsg_cancel(skb, nlh);
3460 return -EMSGSIZE;
3461 }
1da177e4 3462
0ab6803b 3463 return nlmsg_end(skb, nlh);
1da177e4
LT		 3464}
3465
3466enum addr_type_t
3467{
3468 UNICAST_ADDR,
3469 MULTICAST_ADDR,
3470 ANYCAST_ADDR,
3471};
3472
3473static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3474 enum addr_type_t type)
3475{
3476 int idx, ip_idx;
3477 int s_idx, s_ip_idx;
3478 int err = 1;
3479 struct net_device *dev;
3480 struct inet6_dev *idev = NULL;
3481 struct inet6_ifaddr *ifa;
3482 struct ifmcaddr6 *ifmca;
3483 struct ifacaddr6 *ifaca;
3b1e0a65 3484 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3485
3486 s_idx = cb->args[0];
3487 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3488
7562f876 3489 idx = 0;
6fda7350 3490 for_each_netdev(net, dev) {
1da177e4 3491 if (idx < s_idx)
7562f876 3492 goto cont;
1da177e4
LT		 3493 if (idx > s_idx)
3494 s_ip_idx = 0;
3495 ip_idx = 0;
3496 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3497 goto cont;
1da177e4
LT		 3498 read_lock_bh(&idev->lock);
3499 switch (type) {
3500 case UNICAST_ADDR:
ae9cda5d 3501 /* unicast address incl. temp addr */
1da177e4
LT		 3502 for (ifa = idev->addr_list; ifa;
3503 ifa = ifa->if_next, ip_idx++) {
3504 if (ip_idx < s_ip_idx)
3505 continue;
5d5619b4
YH		 3506 err = inet6_fill_ifaddr(skb, ifa,
3507 NETLINK_CB(cb->skb).pid,
3508 cb->nlh->nlmsg_seq,
3509 RTM_NEWADDR,
3510 NLM_F_MULTI);
1da177e4 3511 }
1da177e4
LT		 3512 break;
3513 case MULTICAST_ADDR:
3514 /* multicast address */
1ab1457c 3515 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3516 ifmca = ifmca->next, ip_idx++) {
3517 if (ip_idx < s_ip_idx)
3518 continue;
5d5619b4
YH		 3519 err = inet6_fill_ifmcaddr(skb, ifmca,
3520 NETLINK_CB(cb->skb).pid,
3521 cb->nlh->nlmsg_seq,
3522 RTM_GETMULTICAST,
3523 NLM_F_MULTI);
1da177e4
LT		 3524 }
3525 break;
3526 case ANYCAST_ADDR:
3527 /* anycast address */
3528 for (ifaca = idev->ac_list; ifaca;
3529 ifaca = ifaca->aca_next, ip_idx++) {
3530 if (ip_idx < s_ip_idx)
3531 continue;
5d5619b4
YH		 3532 err = inet6_fill_ifacaddr(skb, ifaca,
3533 NETLINK_CB(cb->skb).pid,
3534 cb->nlh->nlmsg_seq,
3535 RTM_GETANYCAST,
3536 NLM_F_MULTI);
1da177e4
LT		 3537 }
3538 break;
3539 default:
3540 break;
3541 }
3542 read_unlock_bh(&idev->lock);
3543 in6_dev_put(idev);
5d5619b4
YH		 3544
3545 if (err <= 0)
3546 break;
7562f876
PE		 3547cont:
3548 idx++;
1da177e4 3549 }
1da177e4
LT		 3550 cb->args[0] = idx;
3551 cb->args[1] = ip_idx;
3552 return skb->len;
3553}
3554
3555static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3556{
3557 enum addr_type_t type = UNICAST_ADDR;
b854272b 3558
1da177e4
LT		 3559 return inet6_dump_addr(skb, cb, type);
3560}
3561
3562static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3563{
3564 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3565
1da177e4
LT		 3566 return inet6_dump_addr(skb, cb, type);
3567}
3568
3569
3570static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3571{
3572 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3573
1da177e4
LT		 3574 return inet6_dump_addr(skb, cb, type);
3575}
3576
1b29fc2c
TG		 3577static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3578 void *arg)
6c223828 3579{
3b1e0a65 3580 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3581 struct ifaddrmsg *ifm;
3582 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3583 struct in6_addr *addr = NULL;
3584 struct net_device *dev = NULL;
3585 struct inet6_ifaddr *ifa;
3586 struct sk_buff *skb;
6c223828
NT		 3587 int err;
3588
1b29fc2c
TG		 3589 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3590 if (err < 0)
3591 goto errout;
3592
3593 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3594 if (addr == NULL) {
3595 err = -EINVAL;
3596 goto errout;
6c223828 3597 }
6c223828 3598
1b29fc2c 3599 ifm = nlmsg_data(nlh);
6c223828 3600 if (ifm->ifa_index)
6fda7350 3601 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3602
1cab3da6 3603 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3604 err = -EADDRNOTAVAIL;
3605 goto errout;
3606 }
6c223828 3607
0ab6803b 3608 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3609 err = -ENOBUFS;
1b29fc2c 3610 goto errout_ifa;
6c223828
NT		 3611 }
3612
6c223828
NT		 3613 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3614 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3615 if (err < 0) {
3616 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3617 WARN_ON(err == -EMSGSIZE);
3618 kfree_skb(skb);
3619 goto errout_ifa;
3620 }
6fda7350 3621 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3622errout_ifa:
6c223828 3623 in6_ifa_put(ifa);
1b29fc2c 3624errout:
6c223828 3625 return err;
6c223828
NT		 3626}
3627
1da177e4
LT		 3628static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3629{
3630 struct sk_buff *skb;
c346dca1 3631 struct net *net = dev_net(ifa->idev->dev);
5d620266 3632 int err = -ENOBUFS;
1da177e4 3633
0ab6803b 3634 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3635 if (skb == NULL)
3636 goto errout;
3637
3638 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3639 if (err < 0) {
3640 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3641 WARN_ON(err == -EMSGSIZE);
3642 kfree_skb(skb);
3643 goto errout;
3644 }
1ce85fe4
PNA		 3645 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3646 return;
5d620266
TG		 3647errout:
3648 if (err < 0)
6fda7350 3649 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3650}
3651
b6f99a21 3652static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3653 __s32 *array, int bytes)
3654{
04561c1f
TG		 3655 BUG_ON(bytes < (DEVCONF_MAX * 4));
3656
1da177e4
LT		 3657 memset(array, 0, bytes);
3658 array[DEVCONF_FORWARDING] = cnf->forwarding;
3659 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3660 array[DEVCONF_MTU6] = cnf->mtu6;
3661 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3662 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3663 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3664 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3665 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3666 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3667 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3668 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3669#ifdef CONFIG_IPV6_PRIVACY
3670 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3671 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3672 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3673 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3674 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3675#endif
3676 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3677 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3678 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3679#ifdef CONFIG_IPV6_ROUTER_PREF
3680 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3681 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3682#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3683 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3684#endif
930d6ff2 3685#endif
fbea49e1 3686 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3687 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3688#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3689 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3690#endif
7bc570c8
YH		 3691#ifdef CONFIG_IPV6_MROUTE
3692 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3693#endif
778d80be 3694 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3695 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
1da177e4
LT		 3696}
3697
339bf98f
TG		 3698static inline size_t inet6_if_nlmsg_size(void)
3699{
3700 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3701 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3702 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3703 + nla_total_size(4) /* IFLA_MTU */
3704 + nla_total_size(4) /* IFLA_LINK */
3705 + nla_total_size( /* IFLA_PROTINFO */
3706 nla_total_size(4) /* IFLA_INET6_FLAGS */
3707 + nla_total_size(sizeof(struct ifla_cacheinfo))
3708 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3709 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3710 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3711 );
3712}
c5396a31 3713
7f7d9a6b
HX		 3714static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3715 int bytes)
3716{
3717 int i;
3718 int pad = bytes - sizeof(u64) * items;
3719 BUG_ON(pad < 0);
3720
3721 /* Use put_unaligned() because stats may not be aligned for u64. */
3722 put_unaligned(items, &stats[0]);
3723 for (i = 1; i < items; i++)
3724 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3725
3726 memset(&stats[items], 0, pad);
3727}
3728
3729static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3730 int bytes)
3731{
3732 switch(attrtype) {
3733 case IFLA_INET6_STATS:
3734 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3735 break;
3736 case IFLA_INET6_ICMP6STATS:
3737 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3738 break;
3739 }
3740}
3741
1ab1457c 3742static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3743 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3744{
04561c1f 3745 struct net_device *dev = idev->dev;
bf99f1bd 3746 struct nlattr *nla;
04561c1f
TG		 3747 struct ifinfomsg *hdr;
3748 struct nlmsghdr *nlh;
3749 void *protoinfo;
3750 struct ifla_cacheinfo ci;
3751
3752 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3753 if (nlh == NULL)
26932566 3754 return -EMSGSIZE;
04561c1f
TG		 3755
3756 hdr = nlmsg_data(nlh);
3757 hdr->ifi_family = AF_INET6;
3758 hdr->__ifi_pad = 0;
3759 hdr->ifi_type = dev->type;
3760 hdr->ifi_index = dev->ifindex;
3761 hdr->ifi_flags = dev_get_flags(dev);
3762 hdr->ifi_change = 0;
3763
3764 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3765
3766 if (dev->addr_len)
04561c1f 3767 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3768
04561c1f 3769 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3770 if (dev->ifindex != dev->iflink)
04561c1f 3771 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3772
04561c1f
TG		 3773 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3774 if (protoinfo == NULL)
3775 goto nla_put_failure;
1da177e4 3776
04561c1f 3777 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3778
1da177e4
LT		 3779 ci.max_reasm_len = IPV6_MAXPLEN;
3780 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3781 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3782 ci.reachable_time = idev->nd_parms->reachable_time;
3783 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3784 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3785
bf99f1bd
YH		 3786 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3787 if (nla == NULL)
04561c1f 3788 goto nla_put_failure;
bf99f1bd 3789 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3790
bf99f1bd
YH		 3791 /* XXX - MC not implemented */
3792
3793 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3794 if (nla == NULL)
3795 goto nla_put_failure;
3796 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3797
3798 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3799 if (nla == NULL)
3800 goto nla_put_failure;
3801 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3802
04561c1f
TG		 3803 nla_nest_end(skb, protoinfo);
3804 return nlmsg_end(skb, nlh);
1da177e4 3805
04561c1f 3806nla_put_failure:
26932566
PM		 3807 nlmsg_cancel(skb, nlh);
3808 return -EMSGSIZE;
1da177e4
LT		 3809}
3810
3811static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3812{
3b1e0a65 3813 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3814 int idx, err;
3815 int s_idx = cb->args[0];
3816 struct net_device *dev;
3817 struct inet6_dev *idev;
3818
3819 read_lock(&dev_base_lock);
7562f876 3820 idx = 0;
6fda7350 3821 for_each_netdev(net, dev) {
1da177e4 3822 if (idx < s_idx)
7562f876 3823 goto cont;
1da177e4 3824 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3825 goto cont;
1ab1457c 3826 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3827 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3828 in6_dev_put(idev);
3829 if (err <= 0)
3830 break;
7562f876
PE		 3831cont:
3832 idx++;
1da177e4
LT		 3833 }
3834 read_unlock(&dev_base_lock);
3835 cb->args[0] = idx;
3836
3837 return skb->len;
3838}
3839
3840void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3841{
3842 struct sk_buff *skb;
c346dca1 3843 struct net *net = dev_net(idev->dev);
8d7a76c9 3844 int err = -ENOBUFS;
1ab1457c 3845
339bf98f 3846 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3847 if (skb == NULL)
3848 goto errout;
3849
3850 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3851 if (err < 0) {
3852 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3853 WARN_ON(err == -EMSGSIZE);
3854 kfree_skb(skb);
3855 goto errout;
3856 }
1ce85fe4
PNA		 3857 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3858 return;
8d7a76c9
TG		 3859errout:
3860 if (err < 0)
6fda7350 3861 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3862}
3863
339bf98f
TG		 3864static inline size_t inet6_prefix_nlmsg_size(void)
3865{
3866 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3867 + nla_total_size(sizeof(struct in6_addr))
3868 + nla_total_size(sizeof(struct prefix_cacheinfo));
3869}
c5396a31 3870
1da177e4 3871static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3872 struct prefix_info *pinfo, u32 pid, u32 seq,
3873 int event, unsigned int flags)
1da177e4 3874{
6051e2f4
TG		 3875 struct prefixmsg *pmsg;
3876 struct nlmsghdr *nlh;
1da177e4
LT		 3877 struct prefix_cacheinfo ci;
3878
6051e2f4
TG		 3879 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3880 if (nlh == NULL)
26932566 3881 return -EMSGSIZE;
6051e2f4
TG		 3882
3883 pmsg = nlmsg_data(nlh);
1da177e4 3884 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3885 pmsg->prefix_pad1 = 0;
3886 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3887 pmsg->prefix_ifindex = idev->dev->ifindex;
3888 pmsg->prefix_len = pinfo->prefix_len;
3889 pmsg->prefix_type = pinfo->type;
8a47077a 3890 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3891 pmsg->prefix_flags = 0;
3892 if (pinfo->onlink)
3893 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3894 if (pinfo->autoconf)
3895 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3896
6051e2f4 3897 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3898
3899 ci.preferred_time = ntohl(pinfo->prefered);
3900 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3901 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3902
6051e2f4 3903 return nlmsg_end(skb, nlh);
1da177e4 3904
6051e2f4 3905nla_put_failure:
26932566
PM		 3906 nlmsg_cancel(skb, nlh);
3907 return -EMSGSIZE;
1da177e4
LT		 3908}
3909
1ab1457c 3910static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3911 struct prefix_info *pinfo)
3912{
3913 struct sk_buff *skb;
c346dca1 3914 struct net *net = dev_net(idev->dev);
8c384bfa 3915 int err = -ENOBUFS;
1da177e4 3916
339bf98f 3917 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3918 if (skb == NULL)
3919 goto errout;
3920
3921 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3922 if (err < 0) {
3923 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3924 WARN_ON(err == -EMSGSIZE);
3925 kfree_skb(skb);
3926 goto errout;
3927 }
1ce85fe4
PNA		 3928 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3929 return;
8c384bfa
TG		 3930errout:
3931 if (err < 0)
6fda7350 3932 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3933}
3934
1da177e4
LT		 3935static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3936{
3937 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3938
3939 switch (event) {
3940 case RTM_NEWADDR:
95c385b4
NH		 3941 /*
3942 * If the address was optimistic
3943 * we inserted the route at the start of
3944 * our DAD process, so we don't need
3945 * to do it again
3946 */
3947 if (!(ifp->rt->rt6i_node))
3948 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3949 if (ifp->idev->cnf.forwarding)
3950 addrconf_join_anycast(ifp);
3951 break;
3952 case RTM_DELADDR:
3953 if (ifp->idev->cnf.forwarding)
3954 addrconf_leave_anycast(ifp);
3955 addrconf_leave_solict(ifp->idev, &ifp->addr);
3956 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3957 if (ip6_del_rt(ifp->rt))
1da177e4 3958 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3959 break;
3960 }
3961}
3962
3963static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3964{
8814c4b5 3965 rcu_read_lock_bh();
1da177e4
LT		 3966 if (likely(ifp->idev->dead == 0))
3967 __ipv6_ifa_notify(event, ifp);
8814c4b5 3968 rcu_read_unlock_bh();
1da177e4
LT		 3969}
3970
3971#ifdef CONFIG_SYSCTL
3972
3973static
3974int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3975 void __user *buffer, size_t *lenp, loff_t *ppos)
3976{
3977 int *valp = ctl->data;
3978 int val = *valp;
3979 int ret;
3980
3981 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3982
c8fecf22 3983 if (write)
b325fddb 3984 ret = addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3985 return ret;
1da177e4
LT		 3986}
3987
1ab1457c 3988static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3989 void __user *oldval,
3990 size_t __user *oldlenp,
1f29bcd7 3991 void __user *newval, size_t newlen)
1da177e4
LT		 3992{
3993 int *valp = table->data;
c8fecf22 3994 int val = *valp;
1da177e4
LT		 3995 int new;
3996
3997 if (!newval || !newlen)
3998 return 0;
3999 if (newlen != sizeof(int))
4000 return -EINVAL;
4001 if (get_user(new, (int __user *)newval))
4002 return -EFAULT;
4003 if (new == *valp)
4004 return 0;
4005 if (oldval && oldlenp) {
4006 size_t len;
4007 if (get_user(len, oldlenp))
4008 return -EFAULT;
4009 if (len) {
4010 if (len > table->maxlen)
4011 len = table->maxlen;
4012 if (copy_to_user(oldval, valp, len))
4013 return -EFAULT;
4014 if (put_user(len, oldlenp))
4015 return -EFAULT;
4016 }
4017 }
4018
c8fecf22 4019 *valp = new;
b325fddb 4020 return addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 4021}
4022
4023static struct addrconf_sysctl_table
4024{
4025 struct ctl_table_header *sysctl_header;
f6a07b29 4026 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4027 char *dev_name;
ab32ea5d 4028} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4029 .sysctl_header = NULL,
4030 .addrconf_vars = {
1ab1457c 4031 {
1da177e4
LT		 4032 .ctl_name = NET_IPV6_FORWARDING,
4033 .procname = "forwarding",
1ab1457c 4034 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4035 .maxlen = sizeof(int),
4036 .mode = 0644,
6d9f239a
AD		 4037 .proc_handler = addrconf_sysctl_forward,
4038 .strategy = addrconf_sysctl_forward_strategy,
1da177e4
LT		 4039 },
4040 {
4041 .ctl_name = NET_IPV6_HOP_LIMIT,
4042 .procname = "hop_limit",
1ab1457c 4043 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4044 .maxlen = sizeof(int),
4045 .mode = 0644,
4046 .proc_handler = proc_dointvec,
4047 },
4048 {
4049 .ctl_name = NET_IPV6_MTU,
4050 .procname = "mtu",
4051 .data = &ipv6_devconf.mtu6,
1ab1457c 4052 .maxlen = sizeof(int),
1da177e4 4053 .mode = 0644,
6d9f239a 4054 .proc_handler = proc_dointvec,
1da177e4
LT		 4055 },
4056 {
4057 .ctl_name = NET_IPV6_ACCEPT_RA,
4058 .procname = "accept_ra",
1ab1457c 4059 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4060 .maxlen = sizeof(int),
4061 .mode = 0644,
6d9f239a 4062 .proc_handler = proc_dointvec,
1da177e4
LT		 4063 },
4064 {
4065 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4066 .procname = "accept_redirects",
1ab1457c 4067 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4068 .maxlen = sizeof(int),
4069 .mode = 0644,
6d9f239a 4070 .proc_handler = proc_dointvec,
1da177e4
LT		 4071 },
4072 {
4073 .ctl_name = NET_IPV6_AUTOCONF,
4074 .procname = "autoconf",
1ab1457c 4075 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4076 .maxlen = sizeof(int),
4077 .mode = 0644,
6d9f239a 4078 .proc_handler = proc_dointvec,
1da177e4
LT		 4079 },
4080 {
4081 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4082 .procname = "dad_transmits",
1ab1457c 4083 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4084 .maxlen = sizeof(int),
4085 .mode = 0644,
6d9f239a 4086 .proc_handler = proc_dointvec,
1da177e4
LT		 4087 },
4088 {
4089 .ctl_name = NET_IPV6_RTR_SOLICITS,
4090 .procname = "router_solicitations",
1ab1457c 4091 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4092 .maxlen = sizeof(int),
4093 .mode = 0644,
6d9f239a 4094 .proc_handler = proc_dointvec,
1da177e4
LT		 4095 },
4096 {
4097 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4098 .procname = "router_solicitation_interval",
1ab1457c 4099 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4100 .maxlen = sizeof(int),
4101 .mode = 0644,
6d9f239a
AD		 4102 .proc_handler = proc_dointvec_jiffies,
4103 .strategy = sysctl_jiffies,
1da177e4
LT		 4104 },
4105 {
4106 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4107 .procname = "router_solicitation_delay",
1ab1457c 4108 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4109 .maxlen = sizeof(int),
4110 .mode = 0644,
6d9f239a
AD		 4111 .proc_handler = proc_dointvec_jiffies,
4112 .strategy = sysctl_jiffies,
1da177e4
LT		 4113 },
4114 {
4115 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4116 .procname = "force_mld_version",
1ab1457c 4117 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4118 .maxlen = sizeof(int),
4119 .mode = 0644,
6d9f239a 4120 .proc_handler = proc_dointvec,
1da177e4
LT		 4121 },
4122#ifdef CONFIG_IPV6_PRIVACY
4123 {
4124 .ctl_name = NET_IPV6_USE_TEMPADDR,
4125 .procname = "use_tempaddr",
1ab1457c 4126 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4127 .maxlen = sizeof(int),
4128 .mode = 0644,
6d9f239a 4129 .proc_handler = proc_dointvec,
1da177e4
LT		 4130 },
4131 {
4132 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4133 .procname = "temp_valid_lft",
1ab1457c 4134 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4135 .maxlen = sizeof(int),
4136 .mode = 0644,
6d9f239a 4137 .proc_handler = proc_dointvec,
1da177e4
LT		 4138 },
4139 {
4140 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4141 .procname = "temp_prefered_lft",
1ab1457c 4142 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4143 .maxlen = sizeof(int),
4144 .mode = 0644,
6d9f239a 4145 .proc_handler = proc_dointvec,
1da177e4
LT		 4146 },
4147 {
4148 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4149 .procname = "regen_max_retry",
1ab1457c 4150 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4151 .maxlen = sizeof(int),
4152 .mode = 0644,
6d9f239a 4153 .proc_handler = proc_dointvec,
1da177e4
LT		 4154 },
4155 {
4156 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4157 .procname = "max_desync_factor",
1ab1457c 4158 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4159 .maxlen = sizeof(int),
4160 .mode = 0644,
6d9f239a 4161 .proc_handler = proc_dointvec,
1da177e4
LT		 4162 },
4163#endif
4164 {
4165 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4166 .procname = "max_addresses",
4167 .data = &ipv6_devconf.max_addresses,
4168 .maxlen = sizeof(int),
4169 .mode = 0644,
6d9f239a 4170 .proc_handler = proc_dointvec,
1da177e4 4171 },
65f5c7c1
YH		 4172 {
4173 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4174 .procname = "accept_ra_defrtr",
1ab1457c 4175 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4176 .maxlen = sizeof(int),
4177 .mode = 0644,
6d9f239a 4178 .proc_handler = proc_dointvec,
65f5c7c1 4179 },
c4fd30eb
YH		 4180 {
4181 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4182 .procname = "accept_ra_pinfo",
1ab1457c 4183 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4184 .maxlen = sizeof(int),
4185 .mode = 0644,
6d9f239a 4186 .proc_handler = proc_dointvec,
c4fd30eb 4187 },
930d6ff2
YH		 4188#ifdef CONFIG_IPV6_ROUTER_PREF
4189 {
4190 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4191 .procname = "accept_ra_rtr_pref",
4192 .data = &ipv6_devconf.accept_ra_rtr_pref,
4193 .maxlen = sizeof(int),
4194 .mode = 0644,
6d9f239a 4195 .proc_handler = proc_dointvec,
930d6ff2 4196 },
52e16356
YH		 4197 {
4198 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4199 .procname = "router_probe_interval",
4200 .data = &ipv6_devconf.rtr_probe_interval,
4201 .maxlen = sizeof(int),
4202 .mode = 0644,
6d9f239a
AD		 4203 .proc_handler = proc_dointvec_jiffies,
4204 .strategy = sysctl_jiffies,
52e16356 4205 },
fa03ef38 4206#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4207 {
4208 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4209 .procname = "accept_ra_rt_info_max_plen",
4210 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4211 .maxlen = sizeof(int),
4212 .mode = 0644,
6d9f239a 4213 .proc_handler = proc_dointvec,
09c884d4
YH		 4214 },
4215#endif
930d6ff2 4216#endif
fbea49e1
YH		 4217 {
4218 .ctl_name = NET_IPV6_PROXY_NDP,
4219 .procname = "proxy_ndp",
4220 .data = &ipv6_devconf.proxy_ndp,
4221 .maxlen = sizeof(int),
4222 .mode = 0644,
6d9f239a 4223 .proc_handler = proc_dointvec,
fbea49e1 4224 },
0bcbc926
YH		 4225 {
4226 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4227 .procname = "accept_source_route",
4228 .data = &ipv6_devconf.accept_source_route,
4229 .maxlen = sizeof(int),
4230 .mode = 0644,
6d9f239a 4231 .proc_handler = proc_dointvec,
0bcbc926 4232 },
95c385b4
NH		 4233#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4234 {
4235 .ctl_name = CTL_UNNUMBERED,
4236 .procname = "optimistic_dad",
4237 .data = &ipv6_devconf.optimistic_dad,
4238 .maxlen = sizeof(int),
4239 .mode = 0644,
6d9f239a 4240 .proc_handler = proc_dointvec,
95c385b4
NH		 4241
4242 },
7bc570c8
YH		 4243#endif
4244#ifdef CONFIG_IPV6_MROUTE
4245 {
4246 .ctl_name = CTL_UNNUMBERED,
4247 .procname = "mc_forwarding",
4248 .data = &ipv6_devconf.mc_forwarding,
4249 .maxlen = sizeof(int),
a4e6db07 4250 .mode = 0444,
6d9f239a 4251 .proc_handler = proc_dointvec,
7bc570c8 4252 },
95c385b4 4253#endif
778d80be
YH		 4254 {
4255 .ctl_name = CTL_UNNUMBERED,
4256 .procname = "disable_ipv6",
4257 .data = &ipv6_devconf.disable_ipv6,
4258 .maxlen = sizeof(int),
4259 .mode = 0644,
6d9f239a 4260 .proc_handler = proc_dointvec,
778d80be 4261 },
1b34be74
YH		 4262 {
4263 .ctl_name = CTL_UNNUMBERED,
4264 .procname = "accept_dad",
4265 .data = &ipv6_devconf.accept_dad,
4266 .maxlen = sizeof(int),
4267 .mode = 0644,
6d9f239a 4268 .proc_handler = proc_dointvec,
1b34be74 4269 },
1da177e4
LT		 4270 {
4271 .ctl_name = 0, /* sentinel */
4272 }
4273 },
1da177e4
LT		 4274};
4275
bff16c2f
PE		 4276static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4277 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4278{
4279 int i;
1da177e4 4280 struct addrconf_sysctl_table *t;
1da177e4 4281
1dab6222
PE		 4282#define ADDRCONF_CTL_PATH_DEV 3
4283
4284 struct ctl_path addrconf_ctl_path[] = {
4285 { .procname = "net", .ctl_name = CTL_NET, },
4286 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4287 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4288 { /* to be set */ },
4289 { },
4290 };
4291
4292
af879cc7 4293 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4294 if (t == NULL)
f68635e6
PE		 4295 goto out;
4296
1da177e4
LT		 4297 for (i=0; t->addrconf_vars[i].data; i++) {
4298 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4299 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4300 t->addrconf_vars[i].extra2 = net;
1da177e4 4301 }
1da177e4 4302
1ab1457c
YH		 4303 /*
4304 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4305 * by sysctl and we wouldn't want anyone to change it under our feet
4306 * (see SIOCSIFNAME).
1ab1457c 4307 */
1dab6222
PE		 4308 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4309 if (!t->dev_name)
f68635e6 4310 goto free;
1da177e4 4311
1dab6222
PE		 4312 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4313 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4314
bff16c2f 4315 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4316 t->addrconf_vars);
1da177e4
LT		 4317 if (t->sysctl_header == NULL)
4318 goto free_procname;
f68635e6
PE		 4319
4320 p->sysctl = t;
95897312 4321 return 0;
1da177e4 4322
f68635e6 4323free_procname:
1dab6222 4324 kfree(t->dev_name);
f68635e6 4325free:
1da177e4 4326 kfree(t);
f68635e6 4327out:
95897312 4328 return -ENOBUFS;
1da177e4
LT		 4329}
4330
408c4768
PE		 4331static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4332{
4333 struct addrconf_sysctl_table *t;
4334
4335 if (p->sysctl == NULL)
4336 return;
4337
4338 t = p->sysctl;
4339 p->sysctl = NULL;
4340 unregister_sysctl_table(t->sysctl_header);
4341 kfree(t->dev_name);
4342 kfree(t);
4343}
4344
f52295a9
PE		 4345static void addrconf_sysctl_register(struct inet6_dev *idev)
4346{
408c4768
PE		 4347 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4348 NET_IPV6_NEIGH, "ipv6",
4349 &ndisc_ifinfo_sysctl_change,
0686caa3 4350 ndisc_ifinfo_sysctl_strategy);
c346dca1 4351 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4352 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4353}
4354
408c4768 4355static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4356{
408c4768
PE		 4357 __addrconf_sysctl_unregister(&idev->cnf);
4358 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4359}
4360
4361
4362#endif
4363
e0da5a48
PE		 4364static int addrconf_init_net(struct net *net)
4365{
4366 int err;
4367 struct ipv6_devconf *all, *dflt;
4368
4369 err = -ENOMEM;
4370 all = &ipv6_devconf;
4371 dflt = &ipv6_devconf_dflt;
4372
4373 if (net != &init_net) {
4374 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4375 if (all == NULL)
4376 goto err_alloc_all;
4377
4378 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4379 if (dflt == NULL)
4380 goto err_alloc_dflt;
4381 }
4382
4383 net->ipv6.devconf_all = all;
4384 net->ipv6.devconf_dflt = dflt;
4385
4386#ifdef CONFIG_SYSCTL
4387 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4388 NULL, all);
4389 if (err < 0)
4390 goto err_reg_all;
4391
4392 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4393 NULL, dflt);
4394 if (err < 0)
4395 goto err_reg_dflt;
4396#endif
4397 return 0;
4398
4399#ifdef CONFIG_SYSCTL
4400err_reg_dflt:
4401 __addrconf_sysctl_unregister(all);
4402err_reg_all:
4403 kfree(dflt);
4404#endif
4405err_alloc_dflt:
4406 kfree(all);
4407err_alloc_all:
4408 return err;
4409}
4410
4411static void addrconf_exit_net(struct net *net)
4412{
4413#ifdef CONFIG_SYSCTL
4414 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4415 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4416#endif
4417 if (net != &init_net) {
4418 kfree(net->ipv6.devconf_dflt);
4419 kfree(net->ipv6.devconf_all);
4420 }
4421}
4422
4423static struct pernet_operations addrconf_ops = {
4424 .init = addrconf_init_net,
4425 .exit = addrconf_exit_net,
4426};
4427
1da177e4
LT		 4428/*
4429 * Device notifier
4430 */
4431
4432int register_inet6addr_notifier(struct notifier_block *nb)
4433{
1ab1457c 4434 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4435}
4436
7159039a
YH		 4437EXPORT_SYMBOL(register_inet6addr_notifier);
4438
1da177e4
LT		 4439int unregister_inet6addr_notifier(struct notifier_block *nb)
4440{
1ab1457c 4441 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4442}
4443
7159039a
YH		 4444EXPORT_SYMBOL(unregister_inet6addr_notifier);
4445
1da177e4
LT		 4446/*
4447 * Init / cleanup code
4448 */
4449
4450int __init addrconf_init(void)
4451{
2a8cc6c8
YH		 4452 int err;
4453
4454 if ((err = ipv6_addr_label_init()) < 0) {
4455 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4456 err);
4457 return err;
4458 }
1da177e4 4459
e0da5a48
PE		 4460 register_pernet_subsys(&addrconf_ops);
4461
1da177e4
LT		 4462 /* The addrconf netdev notifier requires that loopback_dev
4463 * has it's ipv6 private information allocated and setup
4464 * before it can bring up and give link-local addresses
4465 * to other devices which are up.
4466 *
4467 * Unfortunately, loopback_dev is not necessarily the first
4468 * entry in the global dev_base list of net devices. In fact,
4469 * it is likely to be the very last entry on that list.
4470 * So this causes the notifier registry below to try and
4471 * give link-local addresses to all devices besides loopback_dev
4472 * first, then loopback_dev, which cases all the non-loopback_dev
4473 * devices to fail to get a link-local address.
4474 *
4475 * So, as a temporary fix, allocate the ipv6 structure for
4476 * loopback_dev first by hand.
4477 * Longer term, all of the dependencies ipv6 has upon the loopback
4478 * device and it being up should be removed.
4479 */
4480 rtnl_lock();
2774c7ab 4481 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4482 err = -ENOMEM;
4483 rtnl_unlock();
4484 if (err)
e0da5a48 4485 goto errlo;
1da177e4
LT		 4486
4487 register_netdevice_notifier(&ipv6_dev_notf);
4488
1da177e4 4489 addrconf_verify(0);
c127ea2c
TG		 4490
4491 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4492 if (err < 0)
4493 goto errout;
4494
4495 /* Only the first call to __rtnl_register can fail */
4496 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4497 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4498 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4499 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4500 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4501
2a8cc6c8
YH		 4502 ipv6_addr_label_rtnl_register();
4503
1da177e4 4504 return 0;
c127ea2c
TG		 4505errout:
4506 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4507errlo:
4508 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4509
4510 return err;
1da177e4
LT		 4511}
4512
09f7709f 4513void addrconf_cleanup(void)
1da177e4 4514{
1ab1457c 4515 struct inet6_ifaddr *ifa;
176c39af 4516 struct net_device *dev;
1da177e4
LT		 4517 int i;
4518
4519 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4520 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4521
4522 rtnl_lock();
4523
176c39af
DL		 4524 /* clean dev list */
4525 for_each_netdev(&init_net, dev) {
4526 if (__in6_dev_get(dev) == NULL)
4527 continue;
4528 addrconf_ifdown(dev, 1);
4529 }
4530 addrconf_ifdown(init_net.loopback_dev, 2);
4531
1da177e4
LT		 4532 /*
4533 * Check hash table.
4534 */
1da177e4
LT		 4535 write_lock_bh(&addrconf_hash_lock);
4536 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4537 for (ifa=inet6_addr_lst[i]; ifa; ) {
4538 struct inet6_ifaddr *bifa;
4539
4540 bifa = ifa;
4541 ifa = ifa->lst_next;
4542 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4543 /* Do not free it; something is wrong.
4544 Now we can investigate it with debugger.
4545 */
4546 }
4547 }
4548 write_unlock_bh(&addrconf_hash_lock);
4549
4550 del_timer(&addr_chk_timer);
1da177e4 4551 rtnl_unlock();
1da177e4 4552}
Linux kernel - Deliverables
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