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[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
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
75c78500
MS		 140static void addrconf_bonding_change(struct net_device *dev,
141 unsigned long event);
1da177e4
LT		 142static int addrconf_ifdown(struct net_device *dev, int how);
143
e431b8c0 144static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 145static void addrconf_dad_timer(unsigned long data);
146static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 147static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 148static void addrconf_rs_timer(unsigned long data);
149static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151
1ab1457c 152static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 153 struct prefix_info *pinfo);
06bfe655
DL		 154static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 struct net_device *dev);
1da177e4 156
e041c683 157static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 158
888c848e 159static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 160 .forwarding = 0,
161 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
162 .mtu6 = IPV6_MIN_MTU,
163 .accept_ra = 1,
164 .accept_redirects = 1,
165 .autoconf = 1,
166 .force_mld_version = 0,
167 .dad_transmits = 1,
168 .rtr_solicits = MAX_RTR_SOLICITATIONS,
169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
171#ifdef CONFIG_IPV6_PRIVACY
172 .use_tempaddr = 0,
173 .temp_valid_lft = TEMP_VALID_LIFETIME,
174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
175 .regen_max_retry = REGEN_MAX_RETRY,
176 .max_desync_factor = MAX_DESYNC_FACTOR,
177#endif
178 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 179 .accept_ra_defrtr = 1,
c4fd30eb 180 .accept_ra_pinfo = 1,
930d6ff2
YH		 181#ifdef CONFIG_IPV6_ROUTER_PREF
182 .accept_ra_rtr_pref = 1,
52e16356 183 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 184#ifdef CONFIG_IPV6_ROUTE_INFO
185 .accept_ra_rt_info_max_plen = 0,
186#endif
930d6ff2 187#endif
fbea49e1 188 .proxy_ndp = 0,
0bcbc926 189 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 190 .disable_ipv6 = 0,
1b34be74 191 .accept_dad = 1,
1da177e4
LT		 192};
193
ab32ea5d 194static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 195 .forwarding = 0,
196 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
197 .mtu6 = IPV6_MIN_MTU,
198 .accept_ra = 1,
199 .accept_redirects = 1,
200 .autoconf = 1,
201 .dad_transmits = 1,
202 .rtr_solicits = MAX_RTR_SOLICITATIONS,
203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205#ifdef CONFIG_IPV6_PRIVACY
206 .use_tempaddr = 0,
207 .temp_valid_lft = TEMP_VALID_LIFETIME,
208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
209 .regen_max_retry = REGEN_MAX_RETRY,
210 .max_desync_factor = MAX_DESYNC_FACTOR,
211#endif
212 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 213 .accept_ra_defrtr = 1,
c4fd30eb 214 .accept_ra_pinfo = 1,
930d6ff2
YH		 215#ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
52e16356 217 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 218#ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_max_plen = 0,
220#endif
930d6ff2 221#endif
fbea49e1 222 .proxy_ndp = 0,
0bcbc926 223 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 224 .disable_ipv6 = 0,
1b34be74 225 .accept_dad = 1,
1da177e4
LT		 226};
227
228/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 229const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 230const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 231const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 233
f24e3d65 234/* Check if a valid qdisc is available */
05297949 235static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 236{
05297949 237 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 238}
239
2b5ead46
YH		 240/* Check if a route is valid prefix route */
241static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242{
243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244}
245
1da177e4
LT		 246static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247{
248 if (del_timer(&ifp->timer))
249 __in6_ifa_put(ifp);
250}
251
252enum addrconf_timer_t
253{
254 AC_NONE,
255 AC_DAD,
256 AC_RS,
257};
258
259static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260 enum addrconf_timer_t what,
261 unsigned long when)
262{
263 if (!del_timer(&ifp->timer))
264 in6_ifa_hold(ifp);
265
266 switch (what) {
267 case AC_DAD:
268 ifp->timer.function = addrconf_dad_timer;
269 break;
270 case AC_RS:
271 ifp->timer.function = addrconf_rs_timer;
272 break;
273 default:;
274 }
275 ifp->timer.expires = jiffies + when;
276 add_timer(&ifp->timer);
277}
278
7f7d9a6b
HX		 279static int snmp6_alloc_dev(struct inet6_dev *idev)
280{
7d720c3e 281 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 282 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 283 goto err_ip;
7d720c3e 284 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 285 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 286 goto err_icmp;
7d720c3e 287 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 288 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 289 goto err_icmpmsg;
7f7d9a6b
HX		 290
291 return 0;
292
14878f75 293err_icmpmsg:
7d720c3e 294 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 295err_icmp:
7d720c3e 296 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 297err_ip:
aaf70ec7 298 return -ENOMEM;
7f7d9a6b
HX		 299}
300
16910b98 301static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 302{
7d720c3e
TH		 303 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 306}
307
1da177e4
LT		 308/* Nobody refers to this device, we may destroy it. */
309
8814c4b5
YH		 310static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311{
312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313 kfree(idev);
314}
315
1da177e4
LT		 316void in6_dev_finish_destroy(struct inet6_dev *idev)
317{
318 struct net_device *dev = idev->dev;
547b792c
IJ		 319
320 WARN_ON(idev->addr_list != NULL);
321 WARN_ON(idev->mc_list != NULL);
322
1da177e4
LT		 323#ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325#endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
8814c4b5 332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 333}
334
7159039a
YH		 335EXPORT_SYMBOL(in6_dev_finish_destroy);
336
1da177e4
LT		 337static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338{
339 struct inet6_dev *ndev;
340
341 ASSERT_RTNL();
342
343 if (dev->mtu < IPV6_MIN_MTU)
344 return NULL;
345
1ab1457c 346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 347
1ab1457c
YH		 348 if (ndev == NULL)
349 return NULL;
322f74a4
IO		 350
351 rwlock_init(&ndev->lock);
352 ndev->dev = dev;
c346dca1 353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 354 ndev->cnf.mtu6 = dev->mtu;
355 ndev->cnf.sysctl = NULL;
356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357 if (ndev->nd_parms == NULL) {
358 kfree(ndev);
359 return NULL;
360 }
0187bdfb
BH		 361 if (ndev->cnf.forwarding)
362 dev_disable_lro(dev);
322f74a4
IO		 363 /* We refer to the device */
364 dev_hold(dev);
1da177e4 365
322f74a4
IO		 366 if (snmp6_alloc_dev(ndev) < 0) {
367 ADBG((KERN_WARNING
368 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 369 __func__, dev->name));
322f74a4
IO		 370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 ndev->dead = 1;
372 in6_dev_finish_destroy(ndev);
373 return NULL;
374 }
1da177e4 375
322f74a4
IO		 376 if (snmp6_register_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 379 __func__, dev->name));
322f74a4
IO		 380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 ndev->dead = 1;
382 in6_dev_finish_destroy(ndev);
383 return NULL;
384 }
385
386 /* One reference from device. We must do this before
387 * we invoke __ipv6_regen_rndid().
388 */
389 in6_dev_hold(ndev);
1da177e4 390
1b34be74
YH		 391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392 ndev->cnf.accept_dad = -1;
393
b077d7ab
YH		 394#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396 printk(KERN_INFO
397 "%s: Disabled Multicast RS\n",
398 dev->name);
399 ndev->cnf.rtr_solicits = 0;
400 }
401#endif
402
1da177e4 403#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
9625ed72 407 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 408 dev->type == ARPHRD_SIT ||
0be669bb 409 dev->type == ARPHRD_NONE) {
322f74a4
IO		 410 printk(KERN_INFO
411 "%s: Disabled Privacy Extensions\n",
412 dev->name);
413 ndev->cnf.use_tempaddr = -1;
414 } else {
415 in6_dev_hold(ndev);
416 ipv6_regen_rndid((unsigned long) ndev);
417 }
1da177e4
LT		 418#endif
419
f24e3d65 420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 421 ndev->if_flags |= IF_READY;
422
322f74a4
IO		 423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
f52295a9 425 addrconf_sysctl_register(ndev);
30c4cf57
DS		 426 /* protected by rtnl_lock */
427 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 428
429 /* Join all-node multicast group */
f3ee4010 430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 431
1da177e4
LT		 432 return ndev;
433}
434
cee89473 435static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 436{
437 struct inet6_dev *idev;
438
439 ASSERT_RTNL();
440
441 if ((idev = __in6_dev_get(dev)) == NULL) {
442 if ((idev = ipv6_add_dev(dev)) == NULL)
443 return NULL;
444 }
c5e33bdd 445
1da177e4
LT		 446 if (dev->flags&IFF_UP)
447 ipv6_mc_up(idev);
448 return idev;
449}
450
451#ifdef CONFIG_SYSCTL
452static void dev_forward_change(struct inet6_dev *idev)
453{
454 struct net_device *dev;
455 struct inet6_ifaddr *ifa;
1da177e4
LT		 456
457 if (!idev)
458 return;
459 dev = idev->dev;
0187bdfb
BH		 460 if (idev->cnf.forwarding)
461 dev_disable_lro(dev);
1da177e4 462 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 463 if (idev->cnf.forwarding)
f3ee4010 464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 465 else
f3ee4010 466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 467 }
468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 469 if (ifa->flags&IFA_F_TENTATIVE)
470 continue;
1da177e4
LT		 471 if (idev->cnf.forwarding)
472 addrconf_join_anycast(ifa);
473 else
474 addrconf_leave_anycast(ifa);
475 }
476}
477
478
e186932b 479static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 480{
481 struct net_device *dev;
482 struct inet6_dev *idev;
483
c6d14c84
ED		 484 rcu_read_lock();
485 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 486 idev = __in6_dev_get(dev);
487 if (idev) {
e186932b
PE		 488 int changed = (!idev->cnf.forwarding) ^ (!newf);
489 idev->cnf.forwarding = newf;
1da177e4
LT		 490 if (changed)
491 dev_forward_change(idev);
492 }
1da177e4 493 }
c6d14c84 494 rcu_read_unlock();
1da177e4 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
88af182e
EB		 505 if (!rtnl_trylock()) {
506 /* Restore the original values before restarting */
507 *p = old;
5007392d 508 return restart_syscall();
88af182e 509 }
c8fecf22 510
e186932b
PE		 511 if (p == &net->ipv6.devconf_all->forwarding) {
512 __s32 newf = net->ipv6.devconf_all->forwarding;
513 net->ipv6.devconf_dflt->forwarding = newf;
514 addrconf_forward_change(net, newf);
c8fecf22
PE		 515 } else if ((!*p) ^ (!old))
516 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 517 rtnl_unlock();
c8fecf22
PE		 518
519 if (*p)
7b4da532 520 rt6_purge_dflt_routers(net);
b325fddb 521 return 1;
c8fecf22 522}
1da177e4
LT		 523#endif
524
525/* Nobody refers to this ifaddr, destroy it */
526
527void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
528{
547b792c
IJ		 529 WARN_ON(ifp->if_next != NULL);
530 WARN_ON(ifp->lst_next != NULL);
531
1da177e4
LT		 532#ifdef NET_REFCNT_DEBUG
533 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
534#endif
535
536 in6_dev_put(ifp->idev);
537
538 if (del_timer(&ifp->timer))
539 printk("Timer is still running, when freeing ifa=%p\n", ifp);
540
541 if (!ifp->dead) {
542 printk("Freeing alive inet6 address %p\n", ifp);
543 return;
544 }
545 dst_release(&ifp->rt->u.dst);
546
547 kfree(ifp);
548}
549
e55ffac6
BH		 550static void
551ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
552{
553 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 554 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 555
556 /*
557 * Each device address list is sorted in order of scope -
558 * global before linklocal.
559 */
560 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
561 ifap = &ifa->if_next) {
8a6ce0c0 562 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 563 break;
564 }
565
566 ifp->if_next = *ifap;
567 *ifap = ifp;
568}
569
3eb84f49
YH		 570/*
571 * Hash function taken from net_alias.c
572 */
573static u8 ipv6_addr_hash(const struct in6_addr *addr)
574{
575 __u32 word;
576
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581
582 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
583 word ^= (word >> 16);
584 word ^= (word >> 8);
585
586 return ((word ^ (word >> 4)) & 0x0f);
587}
588
1da177e4
LT		 589/* On success it returns ifp with increased reference count */
590
591static struct inet6_ifaddr *
592ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 593 int scope, u32 flags)
1da177e4
LT		 594{
595 struct inet6_ifaddr *ifa = NULL;
596 struct rt6_info *rt;
597 int hash;
598 int err = 0;
d68b8270
YH		 599 int addr_type = ipv6_addr_type(addr);
600
601 if (addr_type == IPV6_ADDR_ANY ||
602 addr_type & IPV6_ADDR_MULTICAST ||
603 (!(idev->dev->flags & IFF_LOOPBACK) &&
604 addr_type & IPV6_ADDR_LOOPBACK))
605 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 606
8814c4b5 607 rcu_read_lock_bh();
1da177e4
LT		 608 if (idev->dead) {
609 err = -ENODEV; /*XXX*/
610 goto out2;
611 }
612
56d417b1 613 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 614 err = -EACCES;
615 goto out2;
616 }
617
1da177e4
LT		 618 write_lock(&addrconf_hash_lock);
619
620 /* Ignore adding duplicate addresses on an interface */
c346dca1 621 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 622 ADBG(("ipv6_add_addr: already assigned\n"));
623 err = -EEXIST;
624 goto out;
625 }
626
322f74a4 627 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 628
629 if (ifa == NULL) {
630 ADBG(("ipv6_add_addr: malloc failed\n"));
631 err = -ENOBUFS;
632 goto out;
633 }
634
635 rt = addrconf_dst_alloc(idev, addr, 0);
636 if (IS_ERR(rt)) {
637 err = PTR_ERR(rt);
638 goto out;
639 }
640
1da177e4
LT		 641 ipv6_addr_copy(&ifa->addr, addr);
642
643 spin_lock_init(&ifa->lock);
644 init_timer(&ifa->timer);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
57f5f544
KF		 651 ifa->rt = rt;
652
95c385b4
NH		 653 /*
654 * part one of RFC 4429, section 3.3
655 * We should not configure an address as
656 * optimistic if we do not yet know the link
657 * layer address of our nexhop router
658 */
659
660 if (rt->rt6i_nexthop == NULL)
661 ifa->flags &= ~IFA_F_OPTIMISTIC;
662
1da177e4
LT		 663 ifa->idev = idev;
664 in6_dev_hold(idev);
665 /* For caller */
666 in6_ifa_hold(ifa);
667
668 /* Add to big hash table */
669 hash = ipv6_addr_hash(addr);
670
671 ifa->lst_next = inet6_addr_lst[hash];
672 inet6_addr_lst[hash] = ifa;
673 in6_ifa_hold(ifa);
674 write_unlock(&addrconf_hash_lock);
675
676 write_lock(&idev->lock);
677 /* Add to inet6_dev unicast addr list. */
e55ffac6 678 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 679
680#ifdef CONFIG_IPV6_PRIVACY
681 if (ifa->flags&IFA_F_TEMPORARY) {
682 ifa->tmp_next = idev->tempaddr_list;
683 idev->tempaddr_list = ifa;
684 in6_ifa_hold(ifa);
685 }
686#endif
687
1da177e4
LT		 688 in6_ifa_hold(ifa);
689 write_unlock(&idev->lock);
690out2:
8814c4b5 691 rcu_read_unlock_bh();
1da177e4 692
fd92833a 693 if (likely(err == 0))
e041c683 694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 695 else {
696 kfree(ifa);
697 ifa = ERR_PTR(err);
698 }
699
700 return ifa;
701out:
702 write_unlock(&addrconf_hash_lock);
703 goto out2;
704}
705
706/* This function wants to get referenced ifp and releases it before return */
707
708static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709{
710 struct inet6_ifaddr *ifa, **ifap;
711 struct inet6_dev *idev = ifp->idev;
712 int hash;
713 int deleted = 0, onlink = 0;
714 unsigned long expires = jiffies;
715
716 hash = ipv6_addr_hash(&ifp->addr);
717
718 ifp->dead = 1;
719
720 write_lock_bh(&addrconf_hash_lock);
721 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
722 ifap = &ifa->lst_next) {
723 if (ifa == ifp) {
724 *ifap = ifa->lst_next;
725 __in6_ifa_put(ifp);
726 ifa->lst_next = NULL;
727 break;
728 }
729 }
730 write_unlock_bh(&addrconf_hash_lock);
731
732 write_lock_bh(&idev->lock);
733#ifdef CONFIG_IPV6_PRIVACY
734 if (ifp->flags&IFA_F_TEMPORARY) {
735 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
736 ifap = &ifa->tmp_next) {
737 if (ifa == ifp) {
738 *ifap = ifa->tmp_next;
739 if (ifp->ifpub) {
740 in6_ifa_put(ifp->ifpub);
741 ifp->ifpub = NULL;
742 }
743 __in6_ifa_put(ifp);
744 ifa->tmp_next = NULL;
745 break;
746 }
747 }
748 }
749#endif
750
1d142804 751 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 752 if (ifa == ifp) {
753 *ifap = ifa->if_next;
754 __in6_ifa_put(ifp);
755 ifa->if_next = NULL;
756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 break;
758 deleted = 1;
1d142804 759 continue;
1da177e4
LT		 760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 ifp->prefix_len)) {
763 if (ifa->flags & IFA_F_PERMANENT) {
764 onlink = 1;
765 if (deleted)
766 break;
767 } else {
768 unsigned long lifetime;
769
770 if (!onlink)
771 onlink = -1;
772
773 spin_lock(&ifa->lock);
4bed72e4
YH		 774
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 /*
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
780 */
1da177e4
LT		 781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
785 }
786 }
787 }
1d142804 788 ifap = &ifa->if_next;
1da177e4
LT		 789 }
790 write_unlock_bh(&idev->lock);
791
b2238566
AV		 792 addrconf_del_timer(ifp);
793
1da177e4
LT		 794 ipv6_ifa_notify(RTM_DELADDR, ifp);
795
e041c683 796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 797
1da177e4
LT		 798 /*
799 * Purge or update corresponding prefix
800 *
801 * 1) we don't purge prefix here if address was not permanent.
802 * prefix is managed by its own lifetime.
803 * 2) if there're no addresses, delete prefix.
804 * 3) if there're still other permanent address(es),
805 * corresponding prefix is still permanent.
806 * 4) otherwise, update prefix lifetime to the
807 * longest valid lifetime among the corresponding
808 * addresses on the device.
809 * Note: subsequent RA will update lifetime.
810 *
811 * --yoshfuji
812 */
813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 struct in6_addr prefix;
815 struct rt6_info *rt;
c346dca1 816 struct net *net = dev_net(ifp->idev->dev);
1da177e4 817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 819
2b5ead46 820 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 821 if (onlink == 0) {
e0a1ad73 822 ip6_del_rt(rt);
1da177e4
LT		 823 rt = NULL;
824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 rt->rt6i_expires = expires;
826 rt->rt6i_flags |= RTF_EXPIRES;
827 }
828 }
829 dst_release(&rt->u.dst);
830 }
831
832 in6_ifa_put(ifp);
833}
834
835#ifdef CONFIG_IPV6_PRIVACY
836static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837{
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 841 unsigned long regen_advance;
1da177e4
LT		 842 int tmp_plen;
843 int ret = 0;
844 int max_addresses;
95c385b4 845 u32 addr_flags;
1da177e4
LT		 846
847 write_lock(&idev->lock);
848 if (ift) {
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
852 tmpaddr = &addr;
853 } else {
854 tmpaddr = NULL;
855 }
856retry:
857 in6_dev_hold(idev);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
860 printk(KERN_INFO
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 in6_ifa_hold(ifp);
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
882 printk(KERN_WARNING
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 ret = -1;
887 goto out;
888 }
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 tmp_valid_lft = min_t(__u32,
891 ifp->valid_lft,
892 idev->cnf.temp_valid_lft);
1ab1457c
YH		 893 tmp_prefered_lft = min_t(__u32,
894 ifp->prefered_lft,
1da177e4
LT		 895 idev->cnf.temp_prefered_lft - desync_factor / HZ);
896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
901
eac55bf9
BB		 902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
1da177e4 905 write_unlock(&idev->lock);
95c385b4 906
eac55bf9
BB		 907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
911 */
912 if (tmp_prefered_lft <= regen_advance) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 ret = -1;
916 goto out;
917 }
918
95c385b4
NH		 919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
923
1da177e4 924 ift = !max_addresses ||
1ab1457c 925 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 926 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 addr_flags) : NULL;
1da177e4
LT		 929 if (!ift || IS_ERR(ift)) {
930 in6_ifa_put(ifp);
931 in6_dev_put(idev);
932 printk(KERN_INFO
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 tmpaddr = &addr;
935 write_lock(&idev->lock);
936 goto retry;
937 }
938
939 spin_lock_bh(&ift->lock);
940 ift->ifpub = ifp;
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
946
947 addrconf_dad_start(ift, 0);
948 in6_ifa_put(ift);
949 in6_dev_put(idev);
950out:
951 return ret;
952}
953#endif
954
955/*
072047e4 956 * Choose an appropriate source address (RFC3484)
1da177e4 957 */
a9b05723
YH		 958enum {
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963#ifdef CONFIG_IPV6_MIP6
964 IPV6_SADDR_RULE_HOA,
965#endif
966 IPV6_SADDR_RULE_OIF,
967 IPV6_SADDR_RULE_LABEL,
968#ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
970#endif
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
973 IPV6_SADDR_RULE_MAX
974};
975
072047e4 976struct ipv6_saddr_score {
a9b05723
YH		 977 int rule;
978 int addr_type;
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 int scopedist;
982 int matchlen;
072047e4
YH		 983};
984
a9b05723 985struct ipv6_saddr_dst {
9acd9f3a 986 const struct in6_addr *addr;
a9b05723
YH		 987 int ifindex;
988 int scope;
989 int label;
7cbca67c 990 unsigned int prefs;
a9b05723 991};
072047e4 992
b6f99a21 993static inline int ipv6_saddr_preferred(int type)
1da177e4 994{
072047e4
YH		 995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
996 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
997 return 1;
998 return 0;
1da177e4
LT		 999}
1000
3de23255
BT		 1001static int ipv6_get_saddr_eval(struct net *net,
1002 struct ipv6_saddr_score *score,
a9b05723
YH		 1003 struct ipv6_saddr_dst *dst,
1004 int i)
1005{
1006 int ret;
1007
1008 if (i <= score->rule) {
1009 switch (i) {
1010 case IPV6_SADDR_RULE_SCOPE:
1011 ret = score->scopedist;
1012 break;
1013 case IPV6_SADDR_RULE_PREFIX:
1014 ret = score->matchlen;
1015 break;
1016 default:
1017 ret = !!test_bit(i, score->scorebits);
1018 }
1019 goto out;
1020 }
1021
1022 switch (i) {
1023 case IPV6_SADDR_RULE_INIT:
1024 /* Rule 0: remember if hiscore is not ready yet */
1025 ret = !!score->ifa;
1026 break;
1027 case IPV6_SADDR_RULE_LOCAL:
1028 /* Rule 1: Prefer same address */
1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030 break;
1031 case IPV6_SADDR_RULE_SCOPE:
1032 /* Rule 2: Prefer appropriate scope
1033 *
1034 * ret
1035 * ^
1036 * -1 | d 15
1037 * ---+--+-+---> scope
1038 * |
1039 * | d is scope of the destination.
1040 * B-d | \
1041 * | \ <- smaller scope is better if
1042 * B-15 | \ if scope is enough for destinaion.
1043 * | ret = B - scope (-1 <= scope >= d <= 15).
1044 * d-C-1 | /
1045 * |/ <- greater is better
1046 * -C / if scope is not enough for destination.
1047 * /| ret = scope - C (-1 <= d < scope <= 15).
1048 *
1049 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051 * Assume B = 0 and we get C > 29.
1052 */
1053 ret = __ipv6_addr_src_scope(score->addr_type);
1054 if (ret >= dst->scope)
1055 ret = -ret;
1056 else
1057 ret -= 128; /* 30 is enough */
1058 score->scopedist = ret;
1059 break;
1060 case IPV6_SADDR_RULE_PREFERRED:
1061 /* Rule 3: Avoid deprecated and optimistic addresses */
1062 ret = ipv6_saddr_preferred(score->addr_type) ||
1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064 break;
1065#ifdef CONFIG_IPV6_MIP6
1066 case IPV6_SADDR_RULE_HOA:
7cbca67c 1067 {
a9b05723 1068 /* Rule 4: Prefer home address */
7cbca67c
YH		 1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1071 break;
7cbca67c 1072 }
a9b05723
YH		 1073#endif
1074 case IPV6_SADDR_RULE_OIF:
1075 /* Rule 5: Prefer outgoing interface */
1076 ret = (!dst->ifindex ||
1077 dst->ifindex == score->ifa->idev->dev->ifindex);
1078 break;
1079 case IPV6_SADDR_RULE_LABEL:
1080 /* Rule 6: Prefer matching label */
3de23255
BT		 1081 ret = ipv6_addr_label(net,
1082 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1083 score->ifa->idev->dev->ifindex) == dst->label;
1084 break;
1085#ifdef CONFIG_IPV6_PRIVACY
1086 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1087 {
a9b05723
YH		 1088 /* Rule 7: Prefer public address
1089 * Note: prefer temprary address if use_tempaddr >= 2
1090 */
7cbca67c
YH		 1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093 score->ifa->idev->cnf.use_tempaddr >= 2;
1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1095 break;
7cbca67c 1096 }
a9b05723
YH		 1097#endif
1098 case IPV6_SADDR_RULE_ORCHID:
1099 /* Rule 8-: Prefer ORCHID vs ORCHID or
1100 * non-ORCHID vs non-ORCHID
1101 */
1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103 ipv6_addr_orchid(dst->addr));
1104 break;
1105 case IPV6_SADDR_RULE_PREFIX:
1106 /* Rule 8: Use longest matching prefix */
1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1108 dst->addr);
1109 break;
1110 default:
1111 ret = 0;
1112 }
1113
1114 if (ret)
1115 __set_bit(i, score->scorebits);
1116 score->rule = i;
1117out:
1118 return ret;
1119}
1120
191cd582 1121int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1122 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1123 struct in6_addr *saddr)
1da177e4 1124{
a9b05723
YH		 1125 struct ipv6_saddr_score scores[2],
1126 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1127 struct ipv6_saddr_dst dst;
072047e4 1128 struct net_device *dev;
a9b05723 1129 int dst_type;
1da177e4 1130
a9b05723
YH		 1131 dst_type = __ipv6_addr_type(daddr);
1132 dst.addr = daddr;
1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1136 dst.prefs = prefs;
a9b05723
YH		 1137
1138 hiscore->rule = -1;
1139 hiscore->ifa = NULL;
1da177e4 1140
8814c4b5 1141 rcu_read_lock();
1da177e4 1142
c6d14c84 1143 for_each_netdev_rcu(net, dev) {
072047e4 1144 struct inet6_dev *idev;
072047e4 1145
a9b05723 1146 /* Candidate Source Address (section 4)
072047e4
YH		 1147 * - multicast and link-local destination address,
1148 * the set of candidate source address MUST only
1149 * include addresses assigned to interfaces
1150 * belonging to the same link as the outgoing
1151 * interface.
1152 * (- For site-local destination addresses, the
1153 * set of candidate source addresses MUST only
1154 * include addresses assigned to interfaces
1155 * belonging to the same site as the outgoing
1156 * interface.)
1157 */
a9b05723
YH		 1158 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1161 continue;
1da177e4 1162
1da177e4 1163 idev = __in6_dev_get(dev);
072047e4
YH		 1164 if (!idev)
1165 continue;
1166
1167 read_lock_bh(&idev->lock);
a9b05723
YH		 1168 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169 int i;
072047e4 1170
a9b05723 1171 /*
6b3ae80a
YH		 1172 * - Tentative Address (RFC2462 section 5.4)
1173 * - A tentative address is not considered
1174 * "assigned to an interface" in the traditional
95c385b4 1175 * sense, unless it is also flagged as optimistic.
6b3ae80a 1176 * - Candidate Source Address (section 4)
072047e4
YH		 1177 * - In any case, anycast addresses, multicast
1178 * addresses, and the unspecified address MUST
1179 * NOT be included in a candidate set.
1180 */
a9b05723
YH		 1181 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1183 continue;
a9b05723
YH		 1184
1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1189 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1190 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1191 "assigned as unicast address on %s",
1192 dev->name);
1193 continue;
1194 }
1195
a9b05723
YH		 1196 score->rule = -1;
1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200 int minihiscore, miniscore;
1201
3de23255
BT		 1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1204
1205 if (minihiscore > miniscore) {
1206 if (i == IPV6_SADDR_RULE_SCOPE &&
1207 score->scopedist > 0) {
1208 /*
1209 * special case:
1210 * each remaining entry
1211 * has too small (not enough)
1212 * scope, because ifa entries
1213 * are sorted by their scope
1214 * values.
1215 */
1216 goto try_nextdev;
1217 }
1218 break;
1219 } else if (minihiscore < miniscore) {
a9b05723
YH		 1220 if (hiscore->ifa)
1221 in6_ifa_put(hiscore->ifa);
1222
1223 in6_ifa_hold(score->ifa);
1224
a0bffffc 1225 swap(hiscore, score);
a9b05723
YH		 1226
1227 /* restore our iterator */
1228 score->ifa = hiscore->ifa;
1229
1230 break;
1da177e4 1231 }
072047e4 1232 }
1da177e4 1233 }
a9b05723 1234try_nextdev:
072047e4 1235 read_unlock_bh(&idev->lock);
1da177e4 1236 }
8814c4b5 1237 rcu_read_unlock();
1da177e4 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
1da177e4
LT		 1373/* Gets referenced address, destroys ifaddr */
1374
cc411d0b 1375static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1376{
1da177e4
LT		 1377 if (ifp->flags&IFA_F_PERMANENT) {
1378 spin_lock_bh(&ifp->lock);
1379 addrconf_del_timer(ifp);
1380 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1381 if (dad_failed)
1382 ifp->flags |= IFA_F_DADFAILED;
1da177e4
LT		 1383 spin_unlock_bh(&ifp->lock);
1384 in6_ifa_put(ifp);
1385#ifdef CONFIG_IPV6_PRIVACY
1386 } else if (ifp->flags&IFA_F_TEMPORARY) {
1387 struct inet6_ifaddr *ifpub;
1388 spin_lock_bh(&ifp->lock);
1389 ifpub = ifp->ifpub;
1390 if (ifpub) {
1391 in6_ifa_hold(ifpub);
1392 spin_unlock_bh(&ifp->lock);
1393 ipv6_create_tempaddr(ifpub, ifp);
1394 in6_ifa_put(ifpub);
1395 } else {
1396 spin_unlock_bh(&ifp->lock);
1397 }
1398 ipv6_del_addr(ifp);
1399#endif
1400 } else
1401 ipv6_del_addr(ifp);
1402}
1403
3c21edbd
YH		 1404void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1405{
1b34be74 1406 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1407
1408 if (net_ratelimit())
0522fea6
JR		 1409 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1410 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1411
1b34be74
YH		 1412 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1413 struct in6_addr addr;
1414
1415 addr.s6_addr32[0] = htonl(0xfe800000);
1416 addr.s6_addr32[1] = 0;
1417
1418 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1419 ipv6_addr_equal(&ifp->addr, &addr)) {
1420 /* DAD failed for link-local based on MAC address */
1421 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1422
1423 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1424 ifp->idev->dev->name);
1b34be74
YH		 1425 }
1426 }
1427
cc411d0b 1428 addrconf_dad_stop(ifp, 1);
3c21edbd 1429}
1da177e4
LT		 1430
1431/* Join to solicited addr multicast group. */
1432
1433void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1434{
1435 struct in6_addr maddr;
1436
1437 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1438 return;
1439
1440 addrconf_addr_solict_mult(addr, &maddr);
1441 ipv6_dev_mc_inc(dev, &maddr);
1442}
1443
1444void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1445{
1446 struct in6_addr maddr;
1447
1448 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1449 return;
1450
1451 addrconf_addr_solict_mult(addr, &maddr);
1452 __ipv6_dev_mc_dec(idev, &maddr);
1453}
1454
20380731 1455static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1456{
1457 struct in6_addr addr;
1458 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1459 if (ipv6_addr_any(&addr))
1460 return;
1461 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1462}
1463
20380731 1464static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1465{
1466 struct in6_addr addr;
1467 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1468 if (ipv6_addr_any(&addr))
1469 return;
1470 __ipv6_dev_ac_dec(ifp->idev, &addr);
1471}
1472
073a8e0e
YH		 1473static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1474{
1475 if (dev->addr_len != ETH_ALEN)
1476 return -1;
1477 memcpy(eui, dev->dev_addr, 3);
1478 memcpy(eui + 5, dev->dev_addr + 3, 3);
1479
1480 /*
1481 * The zSeries OSA network cards can be shared among various
1482 * OS instances, but the OSA cards have only one MAC address.
1483 * This leads to duplicate address conflicts in conjunction
1484 * with IPv6 if more than one instance uses the same card.
1485 *
1486 * The driver for these cards can deliver a unique 16-bit
1487 * identifier for each instance sharing the same card. It is
1488 * placed instead of 0xFFFE in the interface identifier. The
1489 * "u" bit of the interface identifier is not inverted in this
1490 * case. Hence the resulting interface identifier has local
1491 * scope according to RFC2373.
1492 */
1493 if (dev->dev_id) {
1494 eui[3] = (dev->dev_id >> 8) & 0xFF;
1495 eui[4] = dev->dev_id & 0xFF;
1496 } else {
1497 eui[3] = 0xFF;
1498 eui[4] = 0xFE;
1499 eui[0] ^= 2;
1500 }
1501 return 0;
1502}
1503
1504static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1505{
1506 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1507 if (dev->addr_len != ARCNET_ALEN)
1508 return -1;
1509 memset(eui, 0, 7);
1510 eui[7] = *(u8*)dev->dev_addr;
1511 return 0;
1512}
1513
1514static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1515{
1516 if (dev->addr_len != INFINIBAND_ALEN)
1517 return -1;
1518 memcpy(eui, dev->dev_addr + 12, 8);
1519 eui[0] |= 2;
1520 return 0;
1521}
1522
dfd982ba
YH		 1523int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1524{
9af28511
SH		 1525 if (addr == 0)
1526 return -1;
dfd982ba
YH		 1527 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1528 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1529 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1530 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1531 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1532 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1533 eui[1] = 0;
1534 eui[2] = 0x5E;
1535 eui[3] = 0xFE;
1536 memcpy(eui + 4, &addr, 4);
1537 return 0;
1538}
1539EXPORT_SYMBOL(__ipv6_isatap_ifid);
1540
1541static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1542{
1543 if (dev->priv_flags & IFF_ISATAP)
1544 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1545 return -1;
1546}
1547
1da177e4
LT		 1548static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1549{
1550 switch (dev->type) {
1551 case ARPHRD_ETHER:
1552 case ARPHRD_FDDI:
1553 case ARPHRD_IEEE802_TR:
073a8e0e 1554 return addrconf_ifid_eui48(eui, dev);
1da177e4 1555 case ARPHRD_ARCNET:
073a8e0e 1556 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1557 case ARPHRD_INFINIBAND:
073a8e0e 1558 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1559 case ARPHRD_SIT:
dfd982ba 1560 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1561 }
1562 return -1;
1563}
1564
1565static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1566{
1567 int err = -1;
1568 struct inet6_ifaddr *ifp;
1569
1570 read_lock_bh(&idev->lock);
1571 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1572 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1573 memcpy(eui, ifp->addr.s6_addr+8, 8);
1574 err = 0;
1575 break;
1576 }
1577 }
1578 read_unlock_bh(&idev->lock);
1579 return err;
1580}
1581
1582#ifdef CONFIG_IPV6_PRIVACY
1583/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1584static int __ipv6_regen_rndid(struct inet6_dev *idev)
1585{
1da177e4 1586regen:
955189ef 1587 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1588 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1589
1590 /*
1591 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1592 * check if generated address is not inappropriate
1593 *
1594 * - Reserved subnet anycast (RFC 2526)
1595 * 11111101 11....11 1xxxxxxx
c7dc89c0 1596 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1597 * 00-00-5E-FE-xx-xx-xx-xx
1598 * - value 0
1599 * - XXX: already assigned to an address on the device
1600 */
1ab1457c 1601 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1602 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1603 (idev->rndid[7]&0x80))
1604 goto regen;
1605 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1606 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1607 goto regen;
1608 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1609 goto regen;
1610 }
1611
1612 return 0;
1613}
1614
1615static void ipv6_regen_rndid(unsigned long data)
1616{
1617 struct inet6_dev *idev = (struct inet6_dev *) data;
1618 unsigned long expires;
1619
8814c4b5 1620 rcu_read_lock_bh();
1da177e4
LT		 1621 write_lock_bh(&idev->lock);
1622
1623 if (idev->dead)
1624 goto out;
1625
1626 if (__ipv6_regen_rndid(idev) < 0)
1627 goto out;
1ab1457c 1628
1da177e4 1629 expires = jiffies +
1ab1457c 1630 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1631 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1632 if (time_before(expires, jiffies)) {
1633 printk(KERN_WARNING
1634 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1635 idev->dev->name);
1636 goto out;
1637 }
1638
1639 if (!mod_timer(&idev->regen_timer, expires))
1640 in6_dev_hold(idev);
1641
1642out:
1643 write_unlock_bh(&idev->lock);
8814c4b5 1644 rcu_read_unlock_bh();
1da177e4
LT		 1645 in6_dev_put(idev);
1646}
1647
1648static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1649 int ret = 0;
1650
1651 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1652 ret = __ipv6_regen_rndid(idev);
1653 return ret;
1654}
1655#endif
1656
1657/*
1658 * Add prefix route.
1659 */
1660
1661static void
1662addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1663 unsigned long expires, u32 flags)
1da177e4 1664{
86872cb5
TG		 1665 struct fib6_config cfg = {
1666 .fc_table = RT6_TABLE_PREFIX,
1667 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1668 .fc_ifindex = dev->ifindex,
1669 .fc_expires = expires,
1670 .fc_dst_len = plen,
1671 .fc_flags = RTF_UP | flags,
c346dca1 1672 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1673 .fc_protocol = RTPROT_KERNEL,
86872cb5 1674 };
1da177e4 1675
86872cb5 1676 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1677
1678 /* Prevent useless cloning on PtP SIT.
1679 This thing is done here expecting that the whole
1680 class of non-broadcast devices need not cloning.
1681 */
0be669bb 1682#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1683 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1684 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1685#endif
1da177e4 1686
86872cb5 1687 ip6_route_add(&cfg);
1da177e4
LT		 1688}
1689
1690/* Create "default" multicast route to the interface */
1691
1692static void addrconf_add_mroute(struct net_device *dev)
1693{
86872cb5
TG		 1694 struct fib6_config cfg = {
1695 .fc_table = RT6_TABLE_LOCAL,
1696 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1697 .fc_ifindex = dev->ifindex,
1698 .fc_dst_len = 8,
1699 .fc_flags = RTF_UP,
c346dca1 1700 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1701 };
1702
1703 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1704
1705 ip6_route_add(&cfg);
1da177e4
LT		 1706}
1707
0be669bb 1708#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1709static void sit_route_add(struct net_device *dev)
1710{
86872cb5
TG		 1711 struct fib6_config cfg = {
1712 .fc_table = RT6_TABLE_MAIN,
1713 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1714 .fc_ifindex = dev->ifindex,
1715 .fc_dst_len = 96,
1716 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1717 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1718 };
1da177e4
LT		 1719
1720 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1721 ip6_route_add(&cfg);
1da177e4 1722}
0be669bb 1723#endif
1da177e4
LT		 1724
1725static void addrconf_add_lroute(struct net_device *dev)
1726{
1727 struct in6_addr addr;
1728
1729 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1730 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1731}
1732
1733static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1734{
1735 struct inet6_dev *idev;
1736
1737 ASSERT_RTNL();
1738
1739 if ((idev = ipv6_find_idev(dev)) == NULL)
1740 return NULL;
1741
1742 /* Add default multicast route */
1743 addrconf_add_mroute(dev);
1744
1745 /* Add link local route */
1746 addrconf_add_lroute(dev);
1747 return idev;
1748}
1749
1750void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1751{
1752 struct prefix_info *pinfo;
1753 __u32 valid_lft;
1754 __u32 prefered_lft;
1755 int addr_type;
1da177e4 1756 struct inet6_dev *in6_dev;
56d417b1 1757 struct net *net = dev_net(dev);
1da177e4
LT		 1758
1759 pinfo = (struct prefix_info *) opt;
1ab1457c 1760
1da177e4
LT		 1761 if (len < sizeof(struct prefix_info)) {
1762 ADBG(("addrconf: prefix option too short\n"));
1763 return;
1764 }
1ab1457c 1765
1da177e4
LT		 1766 /*
1767 * Validation checks ([ADDRCONF], page 19)
1768 */
1769
1770 addr_type = ipv6_addr_type(&pinfo->prefix);
1771
1772 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1773 return;
1774
1775 valid_lft = ntohl(pinfo->valid);
1776 prefered_lft = ntohl(pinfo->prefered);
1777
1778 if (prefered_lft > valid_lft) {
1779 if (net_ratelimit())
1780 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1781 return;
1782 }
1783
1784 in6_dev = in6_dev_get(dev);
1785
1786 if (in6_dev == NULL) {
1787 if (net_ratelimit())
1788 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1789 return;
1790 }
1791
1792 /*
1793 * Two things going on here:
1794 * 1) Add routes for on-link prefixes
1795 * 2) Configure prefixes with the auto flag set
1796 */
1797
4bed72e4
YH		 1798 if (pinfo->onlink) {
1799 struct rt6_info *rt;
1800 unsigned long rt_expires;
1801
6f704992
YH		 1802 /* Avoid arithmetic overflow. Really, we could
1803 * save rt_expires in seconds, likely valid_lft,
1804 * but it would require division in fib gc, that it
1805 * not good.
1806 */
4bed72e4
YH		 1807 if (HZ > USER_HZ)
1808 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1809 else
1810 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1811
4bed72e4
YH		 1812 if (addrconf_finite_timeout(rt_expires))
1813 rt_expires *= HZ;
1da177e4 1814
56d417b1 1815 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1816 dev->ifindex, 1);
1da177e4 1817
2b5ead46 1818 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1819 /* Autoconf prefix route */
1820 if (valid_lft == 0) {
1821 ip6_del_rt(rt);
1822 rt = NULL;
4bed72e4 1823 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1824 /* not infinity */
1825 rt->rt6i_expires = jiffies + rt_expires;
1826 rt->rt6i_flags |= RTF_EXPIRES;
1827 } else {
1828 rt->rt6i_flags &= ~RTF_EXPIRES;
1829 rt->rt6i_expires = 0;
1da177e4
LT		 1830 }
1831 } else if (valid_lft) {
6f704992 1832 clock_t expires = 0;
4bed72e4
YH		 1833 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1834 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1835 /* not infinity */
1836 flags |= RTF_EXPIRES;
1837 expires = jiffies_to_clock_t(rt_expires);
1838 }
1da177e4 1839 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1840 dev, expires, flags);
1da177e4
LT		 1841 }
1842 if (rt)
1843 dst_release(&rt->u.dst);
1844 }
1845
1846 /* Try to figure out our local address for this prefix */
1847
1848 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1849 struct inet6_ifaddr * ifp;
1850 struct in6_addr addr;
1851 int create = 0, update_lft = 0;
1852
1853 if (pinfo->prefix_len == 64) {
1854 memcpy(&addr, &pinfo->prefix, 8);
1855 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1856 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1857 in6_dev_put(in6_dev);
1858 return;
1859 }
1860 goto ok;
1861 }
1862 if (net_ratelimit())
1863 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1864 pinfo->prefix_len);
1865 in6_dev_put(in6_dev);
1866 return;
1867
1868ok:
1869
53b7997f 1870 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1871
1872 if (ifp == NULL && valid_lft) {
1873 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1874 u32 addr_flags = 0;
1875
1876#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1877 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1878 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1879 addr_flags = IFA_F_OPTIMISTIC;
1880#endif
1da177e4
LT		 1881
1882 /* Do not allow to create too much of autoconfigured
1883 * addresses; this would be too easy way to crash kernel.
1884 */
1885 if (!max_addresses ||
1886 ipv6_count_addresses(in6_dev) < max_addresses)
1887 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1888 addr_type&IPV6_ADDR_SCOPE_MASK,
1889 addr_flags);
1da177e4
LT		 1890
1891 if (!ifp || IS_ERR(ifp)) {
1892 in6_dev_put(in6_dev);
1893 return;
1894 }
1895
1896 update_lft = create = 1;
1897 ifp->cstamp = jiffies;
1898 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1899 }
1900
1901 if (ifp) {
1902 int flags;
1903 unsigned long now;
1904#ifdef CONFIG_IPV6_PRIVACY
1905 struct inet6_ifaddr *ift;
1906#endif
1907 u32 stored_lft;
1908
1909 /* update lifetime (RFC2462 5.5.3 e) */
1910 spin_lock(&ifp->lock);
1911 now = jiffies;
1912 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1913 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1914 else
1915 stored_lft = 0;
1916 if (!update_lft && stored_lft) {
1917 if (valid_lft > MIN_VALID_LIFETIME ||
1918 valid_lft > stored_lft)
1919 update_lft = 1;
1920 else if (stored_lft <= MIN_VALID_LIFETIME) {
1921 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1922 /*
1923 * RFC 4862 Section 5.5.3e:
1924 * "Note that the preferred lifetime of
1925 * the corresponding address is always
1926 * reset to the Preferred Lifetime in
1927 * the received Prefix Information
1928 * option, regardless of whether the
1929 * valid lifetime is also reset or
1930 * ignored."
1931 *
1932 * So if the preferred lifetime in
1933 * this advertisement is different
1934 * than what we have stored, but the
1935 * valid lifetime is invalid, just
1936 * reset prefered_lft.
1937 *
1938 * We must set the valid lifetime
1939 * to the stored lifetime since we'll
1940 * be updating the timestamp below,
1941 * else we'll set it back to the
1942 * minumum.
1943 */
1944 if (prefered_lft != ifp->prefered_lft) {
1945 valid_lft = stored_lft;
1946 update_lft = 1;
1947 }
1da177e4
LT		 1948 } else {
1949 valid_lft = MIN_VALID_LIFETIME;
1950 if (valid_lft < prefered_lft)
1951 prefered_lft = valid_lft;
1952 update_lft = 1;
1953 }
1954 }
1955
1956 if (update_lft) {
1957 ifp->valid_lft = valid_lft;
1958 ifp->prefered_lft = prefered_lft;
1959 ifp->tstamp = now;
1960 flags = ifp->flags;
1961 ifp->flags &= ~IFA_F_DEPRECATED;
1962 spin_unlock(&ifp->lock);
1963
1964 if (!(flags&IFA_F_TENTATIVE))
1965 ipv6_ifa_notify(0, ifp);
1966 } else
1967 spin_unlock(&ifp->lock);
1968
1969#ifdef CONFIG_IPV6_PRIVACY
1970 read_lock_bh(&in6_dev->lock);
1971 /* update all temporary addresses in the list */
1972 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1973 /*
1974 * When adjusting the lifetimes of an existing
1975 * temporary address, only lower the lifetimes.
1976 * Implementations must not increase the
1977 * lifetimes of an existing temporary address
1978 * when processing a Prefix Information Option.
1979 */
c6fbfac2
BB		 1980 if (ifp != ift->ifpub)
1981 continue;
1982
1da177e4
LT		 1983 spin_lock(&ift->lock);
1984 flags = ift->flags;
1985 if (ift->valid_lft > valid_lft &&
1986 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1987 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1988 if (ift->prefered_lft > prefered_lft &&
1989 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1990 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1991 spin_unlock(&ift->lock);
1992 if (!(flags&IFA_F_TENTATIVE))
1993 ipv6_ifa_notify(0, ift);
1994 }
1995
1996 if (create && in6_dev->cnf.use_tempaddr > 0) {
1997 /*
1998 * When a new public address is created as described in [ADDRCONF],
1999 * also create a new temporary address.
2000 */
1ab1457c 2001 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2002 ipv6_create_tempaddr(ifp, NULL);
2003 } else {
2004 read_unlock_bh(&in6_dev->lock);
2005 }
2006#endif
2007 in6_ifa_put(ifp);
2008 addrconf_verify(0);
2009 }
2010 }
2011 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2012 in6_dev_put(in6_dev);
2013}
2014
2015/*
2016 * Set destination address.
2017 * Special case for SIT interfaces where we create a new "virtual"
2018 * device.
2019 */
af284937 2020int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2021{
2022 struct in6_ifreq ireq;
2023 struct net_device *dev;
2024 int err = -EINVAL;
2025
2026 rtnl_lock();
2027
2028 err = -EFAULT;
2029 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2030 goto err_exit;
2031
af284937 2032 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2033
2034 err = -ENODEV;
2035 if (dev == NULL)
2036 goto err_exit;
2037
0be669bb 2038#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2039 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2040 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2041 struct ifreq ifr;
1da177e4
LT		 2042 struct ip_tunnel_parm p;
2043
2044 err = -EADDRNOTAVAIL;
2045 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2046 goto err_exit;
2047
2048 memset(&p, 0, sizeof(p));
2049 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2050 p.iph.saddr = 0;
2051 p.iph.version = 4;
2052 p.iph.ihl = 5;
2053 p.iph.protocol = IPPROTO_IPV6;
2054 p.iph.ttl = 64;
d20b3109 2055 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2056
5bc3eb7e
SH		 2057 if (ops->ndo_do_ioctl) {
2058 mm_segment_t oldfs = get_fs();
2059
2060 set_fs(KERNEL_DS);
2061 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2062 set_fs(oldfs);
2063 } else
2064 err = -EOPNOTSUPP;
1da177e4
LT		 2065
2066 if (err == 0) {
2067 err = -ENOBUFS;
af284937
DL		 2068 dev = __dev_get_by_name(net, p.name);
2069 if (!dev)
1da177e4
LT		 2070 goto err_exit;
2071 err = dev_open(dev);
2072 }
2073 }
0be669bb 2074#endif
1da177e4
LT		 2075
2076err_exit:
2077 rtnl_unlock();
2078 return err;
2079}
2080
2081/*
2082 * Manual configuration of address on an interface
2083 */
af284937 2084static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2085 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2086 __u32 valid_lft)
1da177e4
LT		 2087{
2088 struct inet6_ifaddr *ifp;
2089 struct inet6_dev *idev;
2090 struct net_device *dev;
2091 int scope;
6f704992
YH		 2092 u32 flags;
2093 clock_t expires;
4bed72e4 2094 unsigned long timeout;
1da177e4
LT		 2095
2096 ASSERT_RTNL();
1ab1457c 2097
24ef0da7
TG		 2098 if (plen > 128)
2099 return -EINVAL;
2100
0778769d
NT		 2101 /* check the lifetime */
2102 if (!valid_lft || prefered_lft > valid_lft)
2103 return -EINVAL;
2104
af284937
DL		 2105 dev = __dev_get_by_index(net, ifindex);
2106 if (!dev)
1da177e4 2107 return -ENODEV;
1ab1457c 2108
1da177e4
LT		 2109 if ((idev = addrconf_add_dev(dev)) == NULL)
2110 return -ENOBUFS;
2111
2112 scope = ipv6_addr_scope(pfx);
2113
4bed72e4
YH		 2114 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2115 if (addrconf_finite_timeout(timeout)) {
2116 expires = jiffies_to_clock_t(timeout * HZ);
2117 valid_lft = timeout;
6f704992 2118 flags = RTF_EXPIRES;
4bed72e4
YH		 2119 } else {
2120 expires = 0;
2121 flags = 0;
2122 ifa_flags |= IFA_F_PERMANENT;
6f704992 2123 }
0778769d 2124
4bed72e4
YH		 2125 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2126 if (addrconf_finite_timeout(timeout)) {
2127 if (timeout == 0)
2128 ifa_flags |= IFA_F_DEPRECATED;
2129 prefered_lft = timeout;
2130 }
0778769d
NT		 2131
2132 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2133
1da177e4 2134 if (!IS_ERR(ifp)) {
06aebfb7 2135 spin_lock_bh(&ifp->lock);
0778769d
NT		 2136 ifp->valid_lft = valid_lft;
2137 ifp->prefered_lft = prefered_lft;
2138 ifp->tstamp = jiffies;
06aebfb7 2139 spin_unlock_bh(&ifp->lock);
0778769d 2140
46d48046 2141 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2142 expires, flags);
95c385b4
NH		 2143 /*
2144 * Note that section 3.1 of RFC 4429 indicates
2145 * that the Optimistic flag should not be set for
2146 * manually configured addresses
2147 */
1da177e4
LT		 2148 addrconf_dad_start(ifp, 0);
2149 in6_ifa_put(ifp);
0778769d 2150 addrconf_verify(0);
1da177e4
LT		 2151 return 0;
2152 }
2153
2154 return PTR_ERR(ifp);
2155}
2156
af284937 2157static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2158 unsigned int plen)
1da177e4
LT		 2159{
2160 struct inet6_ifaddr *ifp;
2161 struct inet6_dev *idev;
2162 struct net_device *dev;
1ab1457c 2163
24ef0da7
TG		 2164 if (plen > 128)
2165 return -EINVAL;
2166
af284937
DL		 2167 dev = __dev_get_by_index(net, ifindex);
2168 if (!dev)
1da177e4
LT		 2169 return -ENODEV;
2170
2171 if ((idev = __in6_dev_get(dev)) == NULL)
2172 return -ENXIO;
2173
2174 read_lock_bh(&idev->lock);
2175 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2176 if (ifp->prefix_len == plen &&
2177 ipv6_addr_equal(pfx, &ifp->addr)) {
2178 in6_ifa_hold(ifp);
2179 read_unlock_bh(&idev->lock);
1ab1457c 2180
1da177e4
LT		 2181 ipv6_del_addr(ifp);
2182
2183 /* If the last address is deleted administratively,
2184 disable IPv6 on this interface.
2185 */
2186 if (idev->addr_list == NULL)
2187 addrconf_ifdown(idev->dev, 1);
2188 return 0;
2189 }
2190 }
2191 read_unlock_bh(&idev->lock);
2192 return -EADDRNOTAVAIL;
2193}
2194
2195
af284937 2196int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2197{
2198 struct in6_ifreq ireq;
2199 int err;
1ab1457c 2200
1da177e4
LT		 2201 if (!capable(CAP_NET_ADMIN))
2202 return -EPERM;
1ab1457c 2203
1da177e4
LT		 2204 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2205 return -EFAULT;
2206
2207 rtnl_lock();
af284937
DL		 2208 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2209 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2210 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2211 rtnl_unlock();
2212 return err;
2213}
2214
af284937 2215int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2216{
2217 struct in6_ifreq ireq;
2218 int err;
1ab1457c 2219
1da177e4
LT		 2220 if (!capable(CAP_NET_ADMIN))
2221 return -EPERM;
2222
2223 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2224 return -EFAULT;
2225
2226 rtnl_lock();
af284937
DL		 2227 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2228 ireq.ifr6_prefixlen);
1da177e4
LT		 2229 rtnl_unlock();
2230 return err;
2231}
2232
b5f348e5
IJ		 2233static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2234 int plen, int scope)
2235{
2236 struct inet6_ifaddr *ifp;
2237
2238 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2239 if (!IS_ERR(ifp)) {
2240 spin_lock_bh(&ifp->lock);
2241 ifp->flags &= ~IFA_F_TENTATIVE;
2242 spin_unlock_bh(&ifp->lock);
2243 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2244 in6_ifa_put(ifp);
2245 }
2246}
2247
0be669bb 2248#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2249static void sit_add_v4_addrs(struct inet6_dev *idev)
2250{
1da177e4
LT		 2251 struct in6_addr addr;
2252 struct net_device *dev;
c346dca1 2253 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2254 int scope;
2255
2256 ASSERT_RTNL();
2257
2258 memset(&addr, 0, sizeof(struct in6_addr));
2259 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2260
2261 if (idev->dev->flags&IFF_POINTOPOINT) {
2262 addr.s6_addr32[0] = htonl(0xfe800000);
2263 scope = IFA_LINK;
2264 } else {
2265 scope = IPV6_ADDR_COMPATv4;
2266 }
2267
2268 if (addr.s6_addr32[3]) {
b5f348e5 2269 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2270 return;
2271 }
2272
6fda7350 2273 for_each_netdev(net, dev) {
e5ed6399 2274 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2275 if (in_dev && (dev->flags & IFF_UP)) {
2276 struct in_ifaddr * ifa;
2277
2278 int flag = scope;
2279
2280 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2281 int plen;
2282
2283 addr.s6_addr32[3] = ifa->ifa_local;
2284
2285 if (ifa->ifa_scope == RT_SCOPE_LINK)
2286 continue;
2287 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2288 if (idev->dev->flags&IFF_POINTOPOINT)
2289 continue;
2290 flag |= IFA_HOST;
2291 }
2292 if (idev->dev->flags&IFF_POINTOPOINT)
2293 plen = 64;
2294 else
2295 plen = 96;
2296
b5f348e5 2297 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2298 }
2299 }
1ab1457c 2300 }
1da177e4 2301}
0be669bb 2302#endif
1da177e4
LT		 2303
2304static void init_loopback(struct net_device *dev)
2305{
2306 struct inet6_dev *idev;
1da177e4
LT		 2307
2308 /* ::1 */
2309
2310 ASSERT_RTNL();
2311
2312 if ((idev = ipv6_find_idev(dev)) == NULL) {
2313 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2314 return;
2315 }
2316
b5f348e5 2317 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2318}
2319
2320static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2321{
2322 struct inet6_ifaddr * ifp;
95c385b4
NH		 2323 u32 addr_flags = IFA_F_PERMANENT;
2324
2325#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2326 if (idev->cnf.optimistic_dad &&
702beb87 2327 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2328 addr_flags |= IFA_F_OPTIMISTIC;
2329#endif
1da177e4 2330
95c385b4
NH		 2331
2332 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2333 if (!IS_ERR(ifp)) {
46d48046 2334 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2335 addrconf_dad_start(ifp, 0);
2336 in6_ifa_put(ifp);
2337 }
2338}
2339
2340static void addrconf_dev_config(struct net_device *dev)
2341{
2342 struct in6_addr addr;
2343 struct inet6_dev * idev;
2344
2345 ASSERT_RTNL();
2346
74235a25
HX		 2347 if ((dev->type != ARPHRD_ETHER) &&
2348 (dev->type != ARPHRD_FDDI) &&
2349 (dev->type != ARPHRD_IEEE802_TR) &&
2350 (dev->type != ARPHRD_ARCNET) &&
2351 (dev->type != ARPHRD_INFINIBAND)) {
2352 /* Alas, we support only Ethernet autoconfiguration. */
2353 return;
2354 }
2355
1da177e4
LT		 2356 idev = addrconf_add_dev(dev);
2357 if (idev == NULL)
2358 return;
2359
2360 memset(&addr, 0, sizeof(struct in6_addr));
2361 addr.s6_addr32[0] = htonl(0xFE800000);
2362
2363 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2364 addrconf_add_linklocal(idev, &addr);
2365}
2366
0be669bb 2367#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2368static void addrconf_sit_config(struct net_device *dev)
2369{
2370 struct inet6_dev *idev;
2371
2372 ASSERT_RTNL();
2373
1ab1457c
YH		 2374 /*
2375 * Configure the tunnel with one of our IPv4
2376 * addresses... we should configure all of
1da177e4
LT		 2377 * our v4 addrs in the tunnel
2378 */
2379
2380 if ((idev = ipv6_find_idev(dev)) == NULL) {
2381 printk(KERN_DEBUG "init sit: add_dev failed\n");
2382 return;
2383 }
2384
c7dc89c0
FT		 2385 if (dev->priv_flags & IFF_ISATAP) {
2386 struct in6_addr addr;
2387
2388 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2389 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2390 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2391 addrconf_add_linklocal(idev, &addr);
2392 return;
2393 }
2394
1da177e4
LT		 2395 sit_add_v4_addrs(idev);
2396
2397 if (dev->flags&IFF_POINTOPOINT) {
2398 addrconf_add_mroute(dev);
2399 addrconf_add_lroute(dev);
2400 } else
2401 sit_route_add(dev);
2402}
0be669bb 2403#endif
1da177e4
LT		 2404
2405static inline int
2406ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2407{
2408 struct in6_addr lladdr;
2409
95c385b4 2410 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2411 addrconf_add_linklocal(idev, &lladdr);
2412 return 0;
2413 }
2414 return -1;
2415}
2416
2417static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2418{
2419 struct net_device *link_dev;
c346dca1 2420 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2421
2422 /* first try to inherit the link-local address from the link device */
2423 if (idev->dev->iflink &&
6fda7350 2424 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2425 if (!ipv6_inherit_linklocal(idev, link_dev))
2426 return;
2427 }
2428 /* then try to inherit it from any device */
6fda7350 2429 for_each_netdev(net, link_dev) {
1da177e4
LT		 2430 if (!ipv6_inherit_linklocal(idev, link_dev))
2431 return;
2432 }
2433 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2434}
2435
2436/*
2437 * Autoconfigure tunnel with a link-local address so routing protocols,
2438 * DHCPv6, MLD etc. can be run over the virtual link
2439 */
2440
2441static void addrconf_ip6_tnl_config(struct net_device *dev)
2442{
2443 struct inet6_dev *idev;
2444
2445 ASSERT_RTNL();
2446
2447 if ((idev = addrconf_add_dev(dev)) == NULL) {
2448 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2449 return;
2450 }
2451 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2452}
2453
1ab1457c 2454static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2455 void * data)
2456{
2457 struct net_device *dev = (struct net_device *) data;
74235a25 2458 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2459 int run_pending = 0;
b217d616 2460 int err;
1da177e4
LT		 2461
2462 switch(event) {
45ba9dd2 2463 case NETDEV_REGISTER:
74235a25 2464 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2465 idev = ipv6_add_dev(dev);
2466 if (!idev)
b217d616 2467 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2468 }
2469 break;
1da177e4 2470 case NETDEV_UP:
3c21edbd 2471 case NETDEV_CHANGE:
c2edacf8
JV		 2472 if (dev->flags & IFF_SLAVE)
2473 break;
2474
3c21edbd 2475 if (event == NETDEV_UP) {
f24e3d65 2476 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2477 /* device is not ready yet. */
2478 printk(KERN_INFO
2479 "ADDRCONF(NETDEV_UP): %s: "
2480 "link is not ready\n",
2481 dev->name);
2482 break;
2483 }
99081049 2484
d31c7b8f
EP		 2485 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2486 idev = ipv6_add_dev(dev);
2487
e3ec6cfc 2488 if (idev) {
99081049 2489 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2490 run_pending = 1;
2491 }
3c21edbd 2492 } else {
f24e3d65 2493 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2494 /* device is still not ready. */
2495 break;
2496 }
2497
2498 if (idev) {
2499 if (idev->if_flags & IF_READY) {
2500 /* device is already configured. */
2501 break;
2502 }
2503 idev->if_flags |= IF_READY;
2504 }
2505
2506 printk(KERN_INFO
2507 "ADDRCONF(NETDEV_CHANGE): %s: "
2508 "link becomes ready\n",
2509 dev->name);
2510
c5e33bdd 2511 run_pending = 1;
3c21edbd
YH		 2512 }
2513
1da177e4 2514 switch(dev->type) {
0be669bb 2515#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2516 case ARPHRD_SIT:
2517 addrconf_sit_config(dev);
2518 break;
0be669bb 2519#endif
1da177e4
LT		 2520 case ARPHRD_TUNNEL6:
2521 addrconf_ip6_tnl_config(dev);
2522 break;
2523 case ARPHRD_LOOPBACK:
2524 init_loopback(dev);
2525 break;
2526
2527 default:
2528 addrconf_dev_config(dev);
2529 break;
3ff50b79 2530 }
1da177e4 2531 if (idev) {
c5e33bdd
YH		 2532 if (run_pending)
2533 addrconf_dad_run(idev);
2534
1da177e4
LT		 2535 /* If the MTU changed during the interface down, when the
2536 interface up, the changed MTU must be reflected in the
2537 idev as well as routers.
2538 */
2539 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2540 rt6_mtu_change(dev, dev->mtu);
2541 idev->cnf.mtu6 = dev->mtu;
2542 }
2543 idev->tstamp = jiffies;
2544 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2545 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2546 stop IPv6 on this interface.
2547 */
2548 if (dev->mtu < IPV6_MIN_MTU)
2549 addrconf_ifdown(dev, event != NETDEV_DOWN);
2550 }
2551 break;
2552
2553 case NETDEV_CHANGEMTU:
d31c7b8f 2554 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2555 rt6_mtu_change(dev, dev->mtu);
2556 idev->cnf.mtu6 = dev->mtu;
2557 break;
2558 }
2559
d31c7b8f
EP		 2560 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2561 idev = ipv6_add_dev(dev);
2562 if (idev)
2563 break;
2564 }
2565
1da177e4
LT		 2566 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2567
2568 case NETDEV_DOWN:
2569 case NETDEV_UNREGISTER:
2570 /*
2571 * Remove all addresses from this interface.
2572 */
2573 addrconf_ifdown(dev, event != NETDEV_DOWN);
2574 break;
3c21edbd 2575
1da177e4 2576 case NETDEV_CHANGENAME:
1da177e4 2577 if (idev) {
5632c515 2578 snmp6_unregister_dev(idev);
408c4768 2579 addrconf_sysctl_unregister(idev);
f52295a9 2580 addrconf_sysctl_register(idev);
b217d616
HX		 2581 err = snmp6_register_dev(idev);
2582 if (err)
2583 return notifier_from_errno(err);
5632c515 2584 }
1da177e4 2585 break;
75c78500
MS		 2586 case NETDEV_BONDING_OLDTYPE:
2587 case NETDEV_BONDING_NEWTYPE:
2588 addrconf_bonding_change(dev, event);
2589 break;
3ff50b79 2590 }
1da177e4
LT		 2591
2592 return NOTIFY_OK;
2593}
2594
2595/*
2596 * addrconf module should be notified of a device going up
2597 */
2598static struct notifier_block ipv6_dev_notf = {
2599 .notifier_call = addrconf_notify,
2600 .priority = 0
2601};
2602
75c78500
MS		 2603static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2604{
2605 struct inet6_dev *idev;
2606 ASSERT_RTNL();
2607
2608 idev = __in6_dev_get(dev);
2609
2610 if (event == NETDEV_BONDING_NEWTYPE)
2611 ipv6_mc_remap(idev);
2612 else if (event == NETDEV_BONDING_OLDTYPE)
2613 ipv6_mc_unmap(idev);
2614}
2615
1da177e4
LT		 2616static int addrconf_ifdown(struct net_device *dev, int how)
2617{
2618 struct inet6_dev *idev;
2619 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2620 struct net *net = dev_net(dev);
1da177e4
LT		 2621 int i;
2622
2623 ASSERT_RTNL();
2624
f3db4851 2625 rt6_ifdown(net, dev);
1da177e4
LT		 2626 neigh_ifdown(&nd_tbl, dev);
2627
2628 idev = __in6_dev_get(dev);
2629 if (idev == NULL)
2630 return -ENODEV;
2631
2632 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2633 Do not dev_put!
1da177e4 2634 */
439e2385 2635 if (how) {
1da177e4 2636 idev->dead = 1;
8814c4b5
YH		 2637
2638 /* protected by rtnl_lock */
2639 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2640
2641 /* Step 1.5: remove snmp6 entry */
2642 snmp6_unregister_dev(idev);
2643
2644 }
2645
2646 /* Step 2: clear hash table */
2647 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2648 bifa = &inet6_addr_lst[i];
2649
2650 write_lock_bh(&addrconf_hash_lock);
2651 while ((ifa = *bifa) != NULL) {
dc2b99f7 2652 if (ifa->idev == idev &&
2653 (how || !(ifa->flags&IFA_F_PERMANENT))) {
1da177e4
LT		 2654 *bifa = ifa->lst_next;
2655 ifa->lst_next = NULL;
2656 addrconf_del_timer(ifa);
2657 in6_ifa_put(ifa);
2658 continue;
2659 }
2660 bifa = &ifa->lst_next;
2661 }
2662 write_unlock_bh(&addrconf_hash_lock);
2663 }
2664
2665 write_lock_bh(&idev->lock);
2666
2667 /* Step 3: clear flags for stateless addrconf */
439e2385 2668 if (!how)
3c21edbd 2669 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2670
2671 /* Step 4: clear address list */
2672#ifdef CONFIG_IPV6_PRIVACY
439e2385 2673 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2674 in6_dev_put(idev);
2675
2676 /* clear tempaddr list */
2677 while ((ifa = idev->tempaddr_list) != NULL) {
2678 idev->tempaddr_list = ifa->tmp_next;
2679 ifa->tmp_next = NULL;
2680 ifa->dead = 1;
2681 write_unlock_bh(&idev->lock);
2682 spin_lock_bh(&ifa->lock);
2683
2684 if (ifa->ifpub) {
2685 in6_ifa_put(ifa->ifpub);
2686 ifa->ifpub = NULL;
2687 }
2688 spin_unlock_bh(&ifa->lock);
2689 in6_ifa_put(ifa);
2690 write_lock_bh(&idev->lock);
2691 }
2692#endif
dc2b99f7 2693 bifa = &idev->addr_list;
2694 while ((ifa = *bifa) != NULL) {
2695 if (how == 0 && (ifa->flags&IFA_F_PERMANENT)) {
2696 /* Retain permanent address on admin down */
2697 bifa = &ifa->if_next;
2698
2699 /* Restart DAD if needed when link comes back up */
2700 if ( !((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2701 idev->cnf.accept_dad <= 0 ||
2702 (ifa->flags & IFA_F_NODAD)))
2703 ifa->flags |= IFA_F_TENTATIVE;
2704 } else {
2705 *bifa = ifa->if_next;
2706 ifa->if_next = NULL;
1da177e4 2707
dc2b99f7 2708 ifa->dead = 1;
2709 write_unlock_bh(&idev->lock);
1da177e4 2710
dc2b99f7 2711 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2712 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2713 in6_ifa_put(ifa);
2714
2715 write_lock_bh(&idev->lock);
2716 }
1da177e4
LT		 2717 }
2718 write_unlock_bh(&idev->lock);
2719
2720 /* Step 5: Discard multicast list */
2721
439e2385 2722 if (how)
1da177e4
LT		 2723 ipv6_mc_destroy_dev(idev);
2724 else
2725 ipv6_mc_down(idev);
2726
1da177e4 2727 idev->tstamp = jiffies;
1ab1457c 2728
1da177e4
LT		 2729 /* Shot the device (if unregistered) */
2730
439e2385 2731 if (how) {
408c4768 2732 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2733 neigh_parms_release(&nd_tbl, idev->nd_parms);
2734 neigh_ifdown(&nd_tbl, dev);
2735 in6_dev_put(idev);
2736 }
2737 return 0;
2738}
2739
2740static void addrconf_rs_timer(unsigned long data)
2741{
2742 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2743
2744 if (ifp->idev->cnf.forwarding)
2745 goto out;
2746
2747 if (ifp->idev->if_flags & IF_RA_RCVD) {
2748 /*
2749 * Announcement received after solicitation
2750 * was sent
2751 */
2752 goto out;
2753 }
2754
2755 spin_lock(&ifp->lock);
2756 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
1da177e4
LT		 2757 /* The wait after the last probe can be shorter */
2758 addrconf_mod_timer(ifp, AC_RS,
2759 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2760 ifp->idev->cnf.rtr_solicit_delay :
2761 ifp->idev->cnf.rtr_solicit_interval);
2762 spin_unlock(&ifp->lock);
2763
f3ee4010 2764 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2765 } else {
2766 spin_unlock(&ifp->lock);
2767 /*
2768 * Note: we do not support deprecated "all on-link"
2769 * assumption any longer.
2770 */
2771 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2772 ifp->idev->dev->name);
2773 }
2774
2775out:
2776 in6_ifa_put(ifp);
2777}
2778
2779/*
2780 * Duplicate Address Detection
2781 */
3c21edbd
YH		 2782static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2783{
2784 unsigned long rand_num;
2785 struct inet6_dev *idev = ifp->idev;
2786
95c385b4
NH		 2787 if (ifp->flags & IFA_F_OPTIMISTIC)
2788 rand_num = 0;
2789 else
2790 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2791
3c21edbd
YH		 2792 ifp->probes = idev->cnf.dad_transmits;
2793 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2794}
2795
e431b8c0 2796static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2797{
2798 struct inet6_dev *idev = ifp->idev;
2799 struct net_device *dev = idev->dev;
1da177e4
LT		 2800
2801 addrconf_join_solict(dev, &ifp->addr);
2802
1da177e4 2803 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2804
2805 read_lock_bh(&idev->lock);
2806 if (ifp->dead)
2807 goto out;
1da177e4 2808
21809faf 2809 spin_lock(&ifp->lock);
1da177e4 2810 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2811 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2812 !(ifp->flags&IFA_F_TENTATIVE) ||
2813 ifp->flags & IFA_F_NODAD) {
cc411d0b 2814 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2815 spin_unlock(&ifp->lock);
1da177e4
LT		 2816 read_unlock_bh(&idev->lock);
2817
2818 addrconf_dad_completed(ifp);
2819 return;
2820 }
2821
6732bade 2822 if (!(idev->if_flags & IF_READY)) {
21809faf 2823 spin_unlock(&ifp->lock);
6732bade 2824 read_unlock_bh(&idev->lock);
3c21edbd 2825 /*
590a9887 2826 * If the device is not ready:
3c21edbd
YH		 2827 * - keep it tentative if it is a permanent address.
2828 * - otherwise, kill it.
2829 */
2830 in6_ifa_hold(ifp);
cc411d0b 2831 addrconf_dad_stop(ifp, 0);
6732bade 2832 return;
3c21edbd 2833 }
95c385b4
NH		 2834
2835 /*
2836 * Optimistic nodes can start receiving
2837 * Frames right away
2838 */
2839 if(ifp->flags & IFA_F_OPTIMISTIC)
2840 ip6_ins_rt(ifp->rt);
2841
6732bade 2842 addrconf_dad_kick(ifp);
21809faf 2843 spin_unlock(&ifp->lock);
1da177e4
LT		 2844out:
2845 read_unlock_bh(&idev->lock);
2846}
2847
2848static void addrconf_dad_timer(unsigned long data)
2849{
2850 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2851 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2852 struct in6_addr mcaddr;
2853
2854 read_lock_bh(&idev->lock);
2855 if (idev->dead) {
2856 read_unlock_bh(&idev->lock);
2857 goto out;
2858 }
21809faf 2859
2860 spin_lock(&ifp->lock);
1da177e4
LT		 2861 if (ifp->probes == 0) {
2862 /*
2863 * DAD was successful
2864 */
2865
cc411d0b 2866 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2867 spin_unlock(&ifp->lock);
1da177e4
LT		 2868 read_unlock_bh(&idev->lock);
2869
2870 addrconf_dad_completed(ifp);
2871
2872 goto out;
2873 }
2874
2875 ifp->probes--;
2876 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2877 spin_unlock(&ifp->lock);
1da177e4
LT		 2878 read_unlock_bh(&idev->lock);
2879
2880 /* send a neighbour solicitation for our addr */
1da177e4 2881 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2882 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2883out:
2884 in6_ifa_put(ifp);
2885}
2886
2887static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2888{
2889 struct net_device * dev = ifp->idev->dev;
2890
2891 /*
2892 * Configure the address for reception. Now it is valid.
2893 */
2894
2895 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2896
2897 /* If added prefix is link local and forwarding is off,
2898 start sending router solicitations.
2899 */
2900
2901 if (ifp->idev->cnf.forwarding == 0 &&
2902 ifp->idev->cnf.rtr_solicits > 0 &&
2903 (dev->flags&IFF_LOOPBACK) == 0 &&
2904 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2905 /*
2906 * If a host as already performed a random delay
2907 * [...] as part of DAD [...] there is no need
2908 * to delay again before sending the first RS
2909 */
f3ee4010 2910 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2911
2912 spin_lock_bh(&ifp->lock);
2913 ifp->probes = 1;
2914 ifp->idev->if_flags |= IF_RS_SENT;
2915 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2916 spin_unlock_bh(&ifp->lock);
2917 }
2918}
2919
c5e33bdd
YH		 2920static void addrconf_dad_run(struct inet6_dev *idev) {
2921 struct inet6_ifaddr *ifp;
2922
2923 read_lock_bh(&idev->lock);
2924 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
21809faf 2925 spin_lock(&ifp->lock);
c5e33bdd 2926 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2927 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2928 continue;
2929 }
21809faf 2930 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2931 addrconf_dad_kick(ifp);
2932 }
2933 read_unlock_bh(&idev->lock);
2934}
2935
1da177e4
LT		 2936#ifdef CONFIG_PROC_FS
2937struct if6_iter_state {
3c40090a 2938 struct seq_net_private p;
1da177e4
LT		 2939 int bucket;
2940};
2941
2942static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2943{
2944 struct inet6_ifaddr *ifa = NULL;
2945 struct if6_iter_state *state = seq->private;
1218854a 2946 struct net *net = seq_file_net(seq);
1da177e4
LT		 2947
2948 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2949 ifa = inet6_addr_lst[state->bucket];
3c40090a 2950
878628fb 2951 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2952 ifa = ifa->lst_next;
1da177e4
LT		 2953 if (ifa)
2954 break;
2955 }
2956 return ifa;
2957}
2958
2959static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2960{
2961 struct if6_iter_state *state = seq->private;
1218854a 2962 struct net *net = seq_file_net(seq);
1da177e4
LT		 2963
2964 ifa = ifa->lst_next;
2965try_again:
3c40090a 2966 if (ifa) {
878628fb 2967 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2968 ifa = ifa->lst_next;
2969 goto try_again;
2970 }
2971 }
2972
1da177e4
LT		 2973 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2974 ifa = inet6_addr_lst[state->bucket];
2975 goto try_again;
2976 }
3c40090a 2977
1da177e4
LT		 2978 return ifa;
2979}
2980
2981static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2982{
2983 struct inet6_ifaddr *ifa = if6_get_first(seq);
2984
2985 if (ifa)
2986 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2987 --pos;
2988 return pos ? NULL : ifa;
2989}
2990
2991static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2992 __acquires(addrconf_hash_lock)
1da177e4
LT		 2993{
2994 read_lock_bh(&addrconf_hash_lock);
2995 return if6_get_idx(seq, *pos);
2996}
2997
2998static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2999{
3000 struct inet6_ifaddr *ifa;
3001
3002 ifa = if6_get_next(seq, v);
3003 ++*pos;
3004 return ifa;
3005}
3006
3007static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 3008 __releases(addrconf_hash_lock)
1da177e4
LT		 3009{
3010 read_unlock_bh(&addrconf_hash_lock);
3011}
3012
3013static int if6_seq_show(struct seq_file *seq, void *v)
3014{
3015 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3016 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3017 &ifp->addr,
1da177e4
LT		 3018 ifp->idev->dev->ifindex,
3019 ifp->prefix_len,
3020 ifp->scope,
3021 ifp->flags,
3022 ifp->idev->dev->name);
3023 return 0;
3024}
3025
56b3d975 3026static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3027 .start = if6_seq_start,
3028 .next = if6_seq_next,
3029 .show = if6_seq_show,
3030 .stop = if6_seq_stop,
3031};
3032
3033static int if6_seq_open(struct inode *inode, struct file *file)
3034{
3c40090a
DL		 3035 return seq_open_net(inode, file, &if6_seq_ops,
3036 sizeof(struct if6_iter_state));
1da177e4
LT		 3037}
3038
9a32144e 3039static const struct file_operations if6_fops = {
1da177e4
LT		 3040 .owner = THIS_MODULE,
3041 .open = if6_seq_open,
3042 .read = seq_read,
3043 .llseek = seq_lseek,
3c40090a 3044 .release = seq_release_net,
1da177e4
LT		 3045};
3046
2c8c1e72 3047static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3048{
3c40090a 3049 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3050 return -ENOMEM;
3051 return 0;
3052}
3053
2c8c1e72 3054static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3055{
3056 proc_net_remove(net, "if_inet6");
3057}
3058
3059static struct pernet_operations if6_proc_net_ops = {
3060 .init = if6_proc_net_init,
3061 .exit = if6_proc_net_exit,
3062};
3063
3064int __init if6_proc_init(void)
3065{
3066 return register_pernet_subsys(&if6_proc_net_ops);
3067}
3068
1da177e4
LT		 3069void if6_proc_exit(void)
3070{
3c40090a 3071 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3072}
3073#endif /* CONFIG_PROC_FS */
3074
59fbb3a6 3075#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3076/* Check if address is a home address configured on any interface. */
389f6612 3077int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3078{
3079 int ret = 0;
3080 struct inet6_ifaddr * ifp;
3081 u8 hash = ipv6_addr_hash(addr);
3082 read_lock_bh(&addrconf_hash_lock);
3083 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3084 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3085 continue;
caad295f 3086 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3087 (ifp->flags & IFA_F_HOMEADDRESS)) {
3088 ret = 1;
3089 break;
3090 }
3091 }
3092 read_unlock_bh(&addrconf_hash_lock);
3093 return ret;
3094}
3095#endif
3096
1da177e4
LT		 3097/*
3098 * Periodic address status verification
3099 */
3100
3101static void addrconf_verify(unsigned long foo)
3102{
3103 struct inet6_ifaddr *ifp;
3104 unsigned long now, next;
3105 int i;
3106
3107 spin_lock_bh(&addrconf_verify_lock);
3108 now = jiffies;
3109 next = now + ADDR_CHECK_FREQUENCY;
3110
3111 del_timer(&addr_chk_timer);
3112
3113 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3114
3115restart:
5d5780df 3116 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3117 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3118 unsigned long age;
3119#ifdef CONFIG_IPV6_PRIVACY
3120 unsigned long regen_advance;
3121#endif
3122
3123 if (ifp->flags & IFA_F_PERMANENT)
3124 continue;
3125
3126 spin_lock(&ifp->lock);
3127 age = (now - ifp->tstamp) / HZ;
3128
3129#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3130 regen_advance = ifp->idev->cnf.regen_max_retry *
3131 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3132 ifp->idev->nd_parms->retrans_time / HZ;
3133#endif
3134
8f27ebb9
YH		 3135 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3136 age >= ifp->valid_lft) {
1da177e4
LT		 3137 spin_unlock(&ifp->lock);
3138 in6_ifa_hold(ifp);
5d5780df 3139 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3140 ipv6_del_addr(ifp);
3141 goto restart;
8f27ebb9
YH		 3142 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3143 spin_unlock(&ifp->lock);
3144 continue;
1da177e4 3145 } else if (age >= ifp->prefered_lft) {
a1ed0526 3146 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3147 int deprecate = 0;
3148
3149 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3150 deprecate = 1;
3151 ifp->flags |= IFA_F_DEPRECATED;
3152 }
3153
3154 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3155 next = ifp->tstamp + ifp->valid_lft * HZ;
3156
3157 spin_unlock(&ifp->lock);
3158
3159 if (deprecate) {
3160 in6_ifa_hold(ifp);
5d5780df 3161 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3162
3163 ipv6_ifa_notify(0, ifp);
3164 in6_ifa_put(ifp);
3165 goto restart;
3166 }
3167#ifdef CONFIG_IPV6_PRIVACY
3168 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3169 !(ifp->flags&IFA_F_TENTATIVE)) {
3170 if (age >= ifp->prefered_lft - regen_advance) {
3171 struct inet6_ifaddr *ifpub = ifp->ifpub;
3172 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3173 next = ifp->tstamp + ifp->prefered_lft * HZ;
3174 if (!ifp->regen_count && ifpub) {
3175 ifp->regen_count++;
3176 in6_ifa_hold(ifp);
3177 in6_ifa_hold(ifpub);
3178 spin_unlock(&ifp->lock);
5d5780df 3179 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3180 spin_lock(&ifpub->lock);
3181 ifpub->regen_count = 0;
3182 spin_unlock(&ifpub->lock);
1da177e4
LT		 3183 ipv6_create_tempaddr(ifpub, ifp);
3184 in6_ifa_put(ifpub);
3185 in6_ifa_put(ifp);
3186 goto restart;
3187 }
3188 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3189 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3190 spin_unlock(&ifp->lock);
3191#endif
3192 } else {
3193 /* ifp->prefered_lft <= ifp->valid_lft */
3194 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3195 next = ifp->tstamp + ifp->prefered_lft * HZ;
3196 spin_unlock(&ifp->lock);
3197 }
3198 }
5d5780df 3199 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3200 }
3201
3202 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3203 add_timer(&addr_chk_timer);
3204 spin_unlock_bh(&addrconf_verify_lock);
3205}
3206
461d8837
TG		 3207static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3208{
3209 struct in6_addr *pfx = NULL;
3210
3211 if (addr)
3212 pfx = nla_data(addr);
3213
3214 if (local) {
3215 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3216 pfx = NULL;
3217 else
3218 pfx = nla_data(local);
3219 }
3220
3221 return pfx;
3222}
3223
ef7c79ed 3224static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3225 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3226 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3227 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3228};
3229
1da177e4
LT		 3230static int
3231inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3232{
3b1e0a65 3233 struct net *net = sock_net(skb->sk);
b933f716
TG		 3234 struct ifaddrmsg *ifm;
3235 struct nlattr *tb[IFA_MAX+1];
1da177e4 3236 struct in6_addr *pfx;
b933f716 3237 int err;
1da177e4 3238
b933f716
TG		 3239 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3240 if (err < 0)
3241 return err;
3242
3243 ifm = nlmsg_data(nlh);
3244 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3245 if (pfx == NULL)
3246 return -EINVAL;
3247
af284937 3248 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3249}
3250
55ebaef1
NT		 3251static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3252 u32 prefered_lft, u32 valid_lft)
081bba5b 3253{
6f704992
YH		 3254 u32 flags;
3255 clock_t expires;
4bed72e4 3256 unsigned long timeout;
46d48046 3257
081bba5b
NT		 3258 if (!valid_lft || (prefered_lft > valid_lft))
3259 return -EINVAL;
3260
4bed72e4
YH		 3261 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3262 if (addrconf_finite_timeout(timeout)) {
3263 expires = jiffies_to_clock_t(timeout * HZ);
3264 valid_lft = timeout;
6f704992 3265 flags = RTF_EXPIRES;
4bed72e4
YH		 3266 } else {
3267 expires = 0;
3268 flags = 0;
3269 ifa_flags |= IFA_F_PERMANENT;
6f704992 3270 }
081bba5b 3271
4bed72e4
YH		 3272 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3273 if (addrconf_finite_timeout(timeout)) {
3274 if (timeout == 0)
3275 ifa_flags |= IFA_F_DEPRECATED;
3276 prefered_lft = timeout;
3277 }
081bba5b
NT		 3278
3279 spin_lock_bh(&ifp->lock);
3b9f9a1c 3280 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3281 ifp->tstamp = jiffies;
3282 ifp->valid_lft = valid_lft;
3283 ifp->prefered_lft = prefered_lft;
3284
3285 spin_unlock_bh(&ifp->lock);
3286 if (!(ifp->flags&IFA_F_TENTATIVE))
3287 ipv6_ifa_notify(0, ifp);
081bba5b 3288
46d48046 3289 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3290 expires, flags);
081bba5b
NT		 3291 addrconf_verify(0);
3292
3293 return 0;
3294}
3295
1da177e4
LT		 3296static int
3297inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3298{
3b1e0a65 3299 struct net *net = sock_net(skb->sk);
461d8837
TG		 3300 struct ifaddrmsg *ifm;
3301 struct nlattr *tb[IFA_MAX+1];
1da177e4 3302 struct in6_addr *pfx;
7198f8ce
TG		 3303 struct inet6_ifaddr *ifa;
3304 struct net_device *dev;
55ebaef1
NT		 3305 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3306 u8 ifa_flags;
461d8837 3307 int err;
1da177e4 3308
461d8837
TG		 3309 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3310 if (err < 0)
3311 return err;
3312
3313 ifm = nlmsg_data(nlh);
3314 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3315 if (pfx == NULL)
3316 return -EINVAL;
3317
461d8837 3318 if (tb[IFA_CACHEINFO]) {
0778769d 3319 struct ifa_cacheinfo *ci;
461d8837
TG		 3320
3321 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3322 valid_lft = ci->ifa_valid;
461d8837
TG		 3323 preferred_lft = ci->ifa_prefered;
3324 } else {
3325 preferred_lft = INFINITY_LIFE_TIME;
3326 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3327 }
3328
af284937 3329 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3330 if (dev == NULL)
3331 return -ENODEV;
3332
55ebaef1 3333 /* We ignore other flags so far. */
3b9f9a1c 3334 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3335
1cab3da6 3336 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3337 if (ifa == NULL) {
3338 /*
3339 * It would be best to check for !NLM_F_CREATE here but
3340 * userspace alreay relies on not having to provide this.
3341 */
af284937
DL		 3342 return inet6_addr_add(net, ifm->ifa_index, pfx,
3343 ifm->ifa_prefixlen, ifa_flags,
3344 preferred_lft, valid_lft);
081bba5b
NT		 3345 }
3346
7198f8ce
TG		 3347 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3348 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3349 err = -EEXIST;
3350 else
55ebaef1 3351 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3352
3353 in6_ifa_put(ifa);
3354
3355 return err;
1da177e4
LT		 3356}
3357
101bb229
TG		 3358static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3359 u8 scope, int ifindex)
3360{
3361 struct ifaddrmsg *ifm;
3362
3363 ifm = nlmsg_data(nlh);
3364 ifm->ifa_family = AF_INET6;
3365 ifm->ifa_prefixlen = prefixlen;
3366 ifm->ifa_flags = flags;
3367 ifm->ifa_scope = scope;
3368 ifm->ifa_index = ifindex;
3369}
3370
85486af0
TG		 3371static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3372 unsigned long tstamp, u32 preferred, u32 valid)
3373{
3374 struct ifa_cacheinfo ci;
3375
3376 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3377 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3378 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3379 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3380 ci.ifa_prefered = preferred;
3381 ci.ifa_valid = valid;
3382
3383 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3384}
3385
101bb229
TG		 3386static inline int rt_scope(int ifa_scope)
3387{
3388 if (ifa_scope & IFA_HOST)
3389 return RT_SCOPE_HOST;
3390 else if (ifa_scope & IFA_LINK)
3391 return RT_SCOPE_LINK;
3392 else if (ifa_scope & IFA_SITE)
3393 return RT_SCOPE_SITE;
3394 else
3395 return RT_SCOPE_UNIVERSE;
3396}
3397
0ab6803b
TG		 3398static inline int inet6_ifaddr_msgsize(void)
3399{
339bf98f
TG		 3400 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3401 + nla_total_size(16) /* IFA_ADDRESS */
3402 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3403}
c5396a31 3404
1da177e4 3405static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3406 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3407{
1da177e4 3408 struct nlmsghdr *nlh;
85486af0 3409 u32 preferred, valid;
1da177e4 3410
0ab6803b
TG		 3411 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3412 if (nlh == NULL)
26932566 3413 return -EMSGSIZE;
0ab6803b 3414
101bb229
TG		 3415 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3416 ifa->idev->dev->ifindex);
3417
1da177e4 3418 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3419 preferred = ifa->prefered_lft;
3420 valid = ifa->valid_lft;
3421 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3422 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3423 if (preferred > tval)
3424 preferred -= tval;
3425 else
3426 preferred = 0;
85486af0
TG		 3427 if (valid != INFINITY_LIFE_TIME)
3428 valid -= tval;
1da177e4
LT		 3429 }
3430 } else {
85486af0
TG		 3431 preferred = INFINITY_LIFE_TIME;
3432 valid = INFINITY_LIFE_TIME;
3433 }
3434
0ab6803b 3435 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3436 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3437 nlmsg_cancel(skb, nlh);
3438 return -EMSGSIZE;
3439 }
1da177e4 3440
0ab6803b 3441 return nlmsg_end(skb, nlh);
1da177e4
LT		 3442}
3443
3444static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3445 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3446{
1da177e4 3447 struct nlmsghdr *nlh;
101bb229
TG		 3448 u8 scope = RT_SCOPE_UNIVERSE;
3449 int ifindex = ifmca->idev->dev->ifindex;
3450
3451 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3452 scope = RT_SCOPE_SITE;
1da177e4 3453
0ab6803b
TG		 3454 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3455 if (nlh == NULL)
26932566 3456 return -EMSGSIZE;
85486af0 3457
0ab6803b
TG		 3458 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3459 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3460 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3461 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3462 nlmsg_cancel(skb, nlh);
3463 return -EMSGSIZE;
3464 }
85486af0 3465
0ab6803b 3466 return nlmsg_end(skb, nlh);
1da177e4
LT		 3467}
3468
3469static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3470 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3471{
1da177e4 3472 struct nlmsghdr *nlh;
101bb229
TG		 3473 u8 scope = RT_SCOPE_UNIVERSE;
3474 int ifindex = ifaca->aca_idev->dev->ifindex;
3475
3476 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3477 scope = RT_SCOPE_SITE;
1da177e4 3478
0ab6803b
TG		 3479 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3480 if (nlh == NULL)
26932566 3481 return -EMSGSIZE;
85486af0 3482
0ab6803b
TG		 3483 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3484 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3485 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3486 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3487 nlmsg_cancel(skb, nlh);
3488 return -EMSGSIZE;
3489 }
1da177e4 3490
0ab6803b 3491 return nlmsg_end(skb, nlh);
1da177e4
LT		 3492}
3493
3494enum addr_type_t
3495{
3496 UNICAST_ADDR,
3497 MULTICAST_ADDR,
3498 ANYCAST_ADDR,
3499};
3500
234b27c3
ED		 3501/* called with rcu_read_lock() */
3502static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3503 struct netlink_callback *cb, enum addr_type_t type,
3504 int s_ip_idx, int *p_ip_idx)
3505{
3506 struct inet6_ifaddr *ifa;
3507 struct ifmcaddr6 *ifmca;
3508 struct ifacaddr6 *ifaca;
3509 int err = 1;
3510 int ip_idx = *p_ip_idx;
3511
3512 read_lock_bh(&idev->lock);
3513 switch (type) {
3514 case UNICAST_ADDR:
3515 /* unicast address incl. temp addr */
3516 for (ifa = idev->addr_list; ifa;
3517 ifa = ifa->if_next, ip_idx++) {
3518 if (ip_idx < s_ip_idx)
3519 continue;
3520 err = inet6_fill_ifaddr(skb, ifa,
3521 NETLINK_CB(cb->skb).pid,
3522 cb->nlh->nlmsg_seq,
3523 RTM_NEWADDR,
3524 NLM_F_MULTI);
3525 if (err <= 0)
3526 break;
3527 }
3528 break;
3529 case MULTICAST_ADDR:
3530 /* multicast address */
3531 for (ifmca = idev->mc_list; ifmca;
3532 ifmca = ifmca->next, ip_idx++) {
3533 if (ip_idx < s_ip_idx)
3534 continue;
3535 err = inet6_fill_ifmcaddr(skb, ifmca,
3536 NETLINK_CB(cb->skb).pid,
3537 cb->nlh->nlmsg_seq,
3538 RTM_GETMULTICAST,
3539 NLM_F_MULTI);
3540 if (err <= 0)
3541 break;
3542 }
3543 break;
3544 case ANYCAST_ADDR:
3545 /* anycast address */
3546 for (ifaca = idev->ac_list; ifaca;
3547 ifaca = ifaca->aca_next, ip_idx++) {
3548 if (ip_idx < s_ip_idx)
3549 continue;
3550 err = inet6_fill_ifacaddr(skb, ifaca,
3551 NETLINK_CB(cb->skb).pid,
3552 cb->nlh->nlmsg_seq,
3553 RTM_GETANYCAST,
3554 NLM_F_MULTI);
3555 if (err <= 0)
3556 break;
3557 }
3558 break;
3559 default:
3560 break;
3561 }
3562 read_unlock_bh(&idev->lock);
3563 *p_ip_idx = ip_idx;
3564 return err;
3565}
3566
1da177e4
LT		 3567static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3568 enum addr_type_t type)
3569{
234b27c3
ED		 3570 struct net *net = sock_net(skb->sk);
3571 int h, s_h;
1da177e4
LT		 3572 int idx, ip_idx;
3573 int s_idx, s_ip_idx;
1da177e4 3574 struct net_device *dev;
234b27c3
ED		 3575 struct inet6_dev *idev;
3576 struct hlist_head *head;
3577 struct hlist_node *node;
1ab1457c 3578
234b27c3
ED		 3579 s_h = cb->args[0];
3580 s_idx = idx = cb->args[1];
3581 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3582
234b27c3
ED		 3583 rcu_read_lock();
3584 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3585 idx = 0;
3586 head = &net->dev_index_head[h];
3587 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3588 if (idx < s_idx)
3589 goto cont;
3590 if (idx > s_idx)
3591 s_ip_idx = 0;
3592 ip_idx = 0;
3593 if ((idev = __in6_dev_get(dev)) == NULL)
3594 goto cont;
3595
3596 if (in6_dump_addrs(idev, skb, cb, type,
3597 s_ip_idx, &ip_idx) <= 0)
3598 goto done;
7562f876 3599cont:
234b27c3
ED		 3600 idx++;
3601 }
1da177e4 3602 }
234b27c3
ED		 3603done:
3604 rcu_read_unlock();
3605 cb->args[0] = h;
3606 cb->args[1] = idx;
3607 cb->args[2] = ip_idx;
3608
1da177e4
LT		 3609 return skb->len;
3610}
3611
3612static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3613{
3614 enum addr_type_t type = UNICAST_ADDR;
b854272b 3615
1da177e4
LT		 3616 return inet6_dump_addr(skb, cb, type);
3617}
3618
3619static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3620{
3621 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3622
1da177e4
LT		 3623 return inet6_dump_addr(skb, cb, type);
3624}
3625
3626
3627static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3628{
3629 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3630
1da177e4
LT		 3631 return inet6_dump_addr(skb, cb, type);
3632}
3633
1b29fc2c
TG		 3634static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3635 void *arg)
6c223828 3636{
3b1e0a65 3637 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3638 struct ifaddrmsg *ifm;
3639 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3640 struct in6_addr *addr = NULL;
3641 struct net_device *dev = NULL;
3642 struct inet6_ifaddr *ifa;
3643 struct sk_buff *skb;
6c223828
NT		 3644 int err;
3645
1b29fc2c
TG		 3646 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3647 if (err < 0)
3648 goto errout;
3649
3650 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3651 if (addr == NULL) {
3652 err = -EINVAL;
3653 goto errout;
6c223828 3654 }
6c223828 3655
1b29fc2c 3656 ifm = nlmsg_data(nlh);
6c223828 3657 if (ifm->ifa_index)
6fda7350 3658 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3659
1cab3da6 3660 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3661 err = -EADDRNOTAVAIL;
3662 goto errout;
3663 }
6c223828 3664
0ab6803b 3665 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3666 err = -ENOBUFS;
1b29fc2c 3667 goto errout_ifa;
6c223828
NT		 3668 }
3669
6c223828
NT		 3670 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3671 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3672 if (err < 0) {
3673 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3674 WARN_ON(err == -EMSGSIZE);
3675 kfree_skb(skb);
3676 goto errout_ifa;
3677 }
6fda7350 3678 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3679errout_ifa:
6c223828 3680 in6_ifa_put(ifa);
1b29fc2c 3681errout:
6c223828 3682 return err;
6c223828
NT		 3683}
3684
1da177e4
LT		 3685static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3686{
3687 struct sk_buff *skb;
c346dca1 3688 struct net *net = dev_net(ifa->idev->dev);
5d620266 3689 int err = -ENOBUFS;
1da177e4 3690
0ab6803b 3691 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3692 if (skb == NULL)
3693 goto errout;
3694
3695 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3696 if (err < 0) {
3697 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3698 WARN_ON(err == -EMSGSIZE);
3699 kfree_skb(skb);
3700 goto errout;
3701 }
1ce85fe4
PNA		 3702 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3703 return;
5d620266
TG		 3704errout:
3705 if (err < 0)
6fda7350 3706 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3707}
3708
b6f99a21 3709static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3710 __s32 *array, int bytes)
3711{
04561c1f
TG		 3712 BUG_ON(bytes < (DEVCONF_MAX * 4));
3713
1da177e4
LT		 3714 memset(array, 0, bytes);
3715 array[DEVCONF_FORWARDING] = cnf->forwarding;
3716 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3717 array[DEVCONF_MTU6] = cnf->mtu6;
3718 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3719 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3720 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3721 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3722 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3723 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3724 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3725 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3726#ifdef CONFIG_IPV6_PRIVACY
3727 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3728 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3729 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3730 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3731 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3732#endif
3733 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3734 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3735 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3736#ifdef CONFIG_IPV6_ROUTER_PREF
3737 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3738 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3739#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3740 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3741#endif
930d6ff2 3742#endif
fbea49e1 3743 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3744 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3745#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3746 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3747#endif
7bc570c8
YH		 3748#ifdef CONFIG_IPV6_MROUTE
3749 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3750#endif
778d80be 3751 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3752 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3753 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3754}
3755
339bf98f
TG		 3756static inline size_t inet6_if_nlmsg_size(void)
3757{
3758 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3759 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3760 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3761 + nla_total_size(4) /* IFLA_MTU */
3762 + nla_total_size(4) /* IFLA_LINK */
3763 + nla_total_size( /* IFLA_PROTINFO */
3764 nla_total_size(4) /* IFLA_INET6_FLAGS */
3765 + nla_total_size(sizeof(struct ifla_cacheinfo))
3766 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3767 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3768 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3769 );
3770}
c5396a31 3771
7d720c3e
TH		 3772static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3773 int items, int bytes)
7f7d9a6b
HX		 3774{
3775 int i;
3776 int pad = bytes - sizeof(u64) * items;
3777 BUG_ON(pad < 0);
3778
3779 /* Use put_unaligned() because stats may not be aligned for u64. */
3780 put_unaligned(items, &stats[0]);
3781 for (i = 1; i < items; i++)
3782 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3783
3784 memset(&stats[items], 0, pad);
3785}
3786
3787static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3788 int bytes)
3789{
3790 switch(attrtype) {
3791 case IFLA_INET6_STATS:
7d720c3e 3792 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3793 break;
3794 case IFLA_INET6_ICMP6STATS:
7d720c3e 3795 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3796 break;
3797 }
3798}
3799
1ab1457c 3800static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3801 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3802{
04561c1f 3803 struct net_device *dev = idev->dev;
bf99f1bd 3804 struct nlattr *nla;
04561c1f
TG		 3805 struct ifinfomsg *hdr;
3806 struct nlmsghdr *nlh;
3807 void *protoinfo;
3808 struct ifla_cacheinfo ci;
3809
3810 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3811 if (nlh == NULL)
26932566 3812 return -EMSGSIZE;
04561c1f
TG		 3813
3814 hdr = nlmsg_data(nlh);
3815 hdr->ifi_family = AF_INET6;
3816 hdr->__ifi_pad = 0;
3817 hdr->ifi_type = dev->type;
3818 hdr->ifi_index = dev->ifindex;
3819 hdr->ifi_flags = dev_get_flags(dev);
3820 hdr->ifi_change = 0;
3821
3822 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3823
3824 if (dev->addr_len)
04561c1f 3825 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3826
04561c1f 3827 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3828 if (dev->ifindex != dev->iflink)
04561c1f 3829 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3830
04561c1f
TG		 3831 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3832 if (protoinfo == NULL)
3833 goto nla_put_failure;
1da177e4 3834
04561c1f 3835 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3836
1da177e4
LT		 3837 ci.max_reasm_len = IPV6_MAXPLEN;
3838 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3839 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3840 ci.reachable_time = idev->nd_parms->reachable_time;
3841 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3842 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3843
bf99f1bd
YH		 3844 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3845 if (nla == NULL)
04561c1f 3846 goto nla_put_failure;
bf99f1bd 3847 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3848
bf99f1bd
YH		 3849 /* XXX - MC not implemented */
3850
3851 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3852 if (nla == NULL)
3853 goto nla_put_failure;
3854 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3855
3856 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3857 if (nla == NULL)
3858 goto nla_put_failure;
3859 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3860
04561c1f
TG		 3861 nla_nest_end(skb, protoinfo);
3862 return nlmsg_end(skb, nlh);
1da177e4 3863
04561c1f 3864nla_put_failure:
26932566
PM		 3865 nlmsg_cancel(skb, nlh);
3866 return -EMSGSIZE;
1da177e4
LT		 3867}
3868
3869static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3870{
3b1e0a65 3871 struct net *net = sock_net(skb->sk);
84d2697d 3872 int h, s_h;
434a8a58 3873 int idx = 0, s_idx;
1da177e4
LT		 3874 struct net_device *dev;
3875 struct inet6_dev *idev;
84d2697d
ED		 3876 struct hlist_head *head;
3877 struct hlist_node *node;
1da177e4 3878
84d2697d
ED		 3879 s_h = cb->args[0];
3880 s_idx = cb->args[1];
3881
3882 rcu_read_lock();
3883 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3884 idx = 0;
3885 head = &net->dev_index_head[h];
3886 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3887 if (idx < s_idx)
3888 goto cont;
3889 idev = __in6_dev_get(dev);
3890 if (!idev)
3891 goto cont;
3892 if (inet6_fill_ifinfo(skb, idev,
3893 NETLINK_CB(cb->skb).pid,
3894 cb->nlh->nlmsg_seq,
3895 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3896 goto out;
7562f876 3897cont:
84d2697d
ED		 3898 idx++;
3899 }
1da177e4 3900 }
84d2697d
ED		 3901out:
3902 rcu_read_unlock();
3903 cb->args[1] = idx;
3904 cb->args[0] = h;
1da177e4
LT		 3905
3906 return skb->len;
3907}
3908
3909void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3910{
3911 struct sk_buff *skb;
c346dca1 3912 struct net *net = dev_net(idev->dev);
8d7a76c9 3913 int err = -ENOBUFS;
1ab1457c 3914
339bf98f 3915 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3916 if (skb == NULL)
3917 goto errout;
3918
3919 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3920 if (err < 0) {
3921 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3922 WARN_ON(err == -EMSGSIZE);
3923 kfree_skb(skb);
3924 goto errout;
3925 }
1ce85fe4
PNA		 3926 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3927 return;
8d7a76c9
TG		 3928errout:
3929 if (err < 0)
6fda7350 3930 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3931}
3932
339bf98f
TG		 3933static inline size_t inet6_prefix_nlmsg_size(void)
3934{
3935 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3936 + nla_total_size(sizeof(struct in6_addr))
3937 + nla_total_size(sizeof(struct prefix_cacheinfo));
3938}
c5396a31 3939
1da177e4 3940static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3941 struct prefix_info *pinfo, u32 pid, u32 seq,
3942 int event, unsigned int flags)
1da177e4 3943{
6051e2f4
TG		 3944 struct prefixmsg *pmsg;
3945 struct nlmsghdr *nlh;
1da177e4
LT		 3946 struct prefix_cacheinfo ci;
3947
6051e2f4
TG		 3948 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3949 if (nlh == NULL)
26932566 3950 return -EMSGSIZE;
6051e2f4
TG		 3951
3952 pmsg = nlmsg_data(nlh);
1da177e4 3953 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3954 pmsg->prefix_pad1 = 0;
3955 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3956 pmsg->prefix_ifindex = idev->dev->ifindex;
3957 pmsg->prefix_len = pinfo->prefix_len;
3958 pmsg->prefix_type = pinfo->type;
8a47077a 3959 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3960 pmsg->prefix_flags = 0;
3961 if (pinfo->onlink)
3962 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3963 if (pinfo->autoconf)
3964 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3965
6051e2f4 3966 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3967
3968 ci.preferred_time = ntohl(pinfo->prefered);
3969 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3970 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3971
6051e2f4 3972 return nlmsg_end(skb, nlh);
1da177e4 3973
6051e2f4 3974nla_put_failure:
26932566
PM		 3975 nlmsg_cancel(skb, nlh);
3976 return -EMSGSIZE;
1da177e4
LT		 3977}
3978
1ab1457c 3979static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3980 struct prefix_info *pinfo)
3981{
3982 struct sk_buff *skb;
c346dca1 3983 struct net *net = dev_net(idev->dev);
8c384bfa 3984 int err = -ENOBUFS;
1da177e4 3985
339bf98f 3986 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3987 if (skb == NULL)
3988 goto errout;
3989
3990 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3991 if (err < 0) {
3992 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3993 WARN_ON(err == -EMSGSIZE);
3994 kfree_skb(skb);
3995 goto errout;
3996 }
1ce85fe4
PNA		 3997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3998 return;
8c384bfa
TG		 3999errout:
4000 if (err < 0)
6fda7350 4001 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4002}
4003
1da177e4
LT		 4004static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4005{
4006 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4007
4008 switch (event) {
4009 case RTM_NEWADDR:
95c385b4
NH		 4010 /*
4011 * If the address was optimistic
4012 * we inserted the route at the start of
4013 * our DAD process, so we don't need
4014 * to do it again
4015 */
4016 if (!(ifp->rt->rt6i_node))
4017 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4018 if (ifp->idev->cnf.forwarding)
4019 addrconf_join_anycast(ifp);
4020 break;
4021 case RTM_DELADDR:
4022 if (ifp->idev->cnf.forwarding)
4023 addrconf_leave_anycast(ifp);
4024 addrconf_leave_solict(ifp->idev, &ifp->addr);
4025 dst_hold(&ifp->rt->u.dst);
e0a1ad73 4026 if (ip6_del_rt(ifp->rt))
1da177e4 4027 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4028 break;
4029 }
4030}
4031
4032static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4033{
8814c4b5 4034 rcu_read_lock_bh();
1da177e4
LT		 4035 if (likely(ifp->idev->dead == 0))
4036 __ipv6_ifa_notify(event, ifp);
8814c4b5 4037 rcu_read_unlock_bh();
1da177e4
LT		 4038}
4039
4040#ifdef CONFIG_SYSCTL
4041
4042static
8d65af78 4043int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4044 void __user *buffer, size_t *lenp, loff_t *ppos)
4045{
4046 int *valp = ctl->data;
4047 int val = *valp;
88af182e 4048 loff_t pos = *ppos;
1da177e4
LT		 4049 int ret;
4050
8d65af78 4051 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4052
c8fecf22 4053 if (write)
b325fddb 4054 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4055 if (ret)
4056 *ppos = pos;
1ab1457c 4057 return ret;
1da177e4
LT		 4058}
4059
56d417b1
BH		 4060static void dev_disable_change(struct inet6_dev *idev)
4061{
4062 if (!idev || !idev->dev)
4063 return;
4064
4065 if (idev->cnf.disable_ipv6)
4066 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4067 else
4068 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4069}
4070
4071static void addrconf_disable_change(struct net *net, __s32 newf)
4072{
4073 struct net_device *dev;
4074 struct inet6_dev *idev;
4075
c6d14c84
ED		 4076 rcu_read_lock();
4077 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4078 idev = __in6_dev_get(dev);
4079 if (idev) {
4080 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4081 idev->cnf.disable_ipv6 = newf;
4082 if (changed)
4083 dev_disable_change(idev);
4084 }
56d417b1 4085 }
c6d14c84 4086 rcu_read_unlock();
56d417b1
BH		 4087}
4088
4089static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4090{
4091 struct net *net;
4092
4093 net = (struct net *)table->extra2;
4094
4095 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4096 return 0;
4097
88af182e
EB		 4098 if (!rtnl_trylock()) {
4099 /* Restore the original values before restarting */
4100 *p = old;
56d417b1 4101 return restart_syscall();
88af182e 4102 }
56d417b1
BH		 4103
4104 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4105 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4106 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4107 addrconf_disable_change(net, newf);
4108 } else if ((!*p) ^ (!old))
4109 dev_disable_change((struct inet6_dev *)table->extra1);
4110
4111 rtnl_unlock();
4112 return 0;
4113}
4114
4115static
8d65af78 4116int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4117 void __user *buffer, size_t *lenp, loff_t *ppos)
4118{
4119 int *valp = ctl->data;
4120 int val = *valp;
88af182e 4121 loff_t pos = *ppos;
56d417b1
BH		 4122 int ret;
4123
8d65af78 4124 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4125
4126 if (write)
4127 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4128 if (ret)
4129 *ppos = pos;
56d417b1
BH		 4130 return ret;
4131}
4132
1da177e4
LT		 4133static struct addrconf_sysctl_table
4134{
4135 struct ctl_table_header *sysctl_header;
f6a07b29 4136 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4137 char *dev_name;
ab32ea5d 4138} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4139 .sysctl_header = NULL,
4140 .addrconf_vars = {
1ab1457c 4141 {
1da177e4 4142 .procname = "forwarding",
1ab1457c 4143 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4144 .maxlen = sizeof(int),
4145 .mode = 0644,
6d9f239a 4146 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4147 },
4148 {
1da177e4 4149 .procname = "hop_limit",
1ab1457c 4150 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4151 .maxlen = sizeof(int),
4152 .mode = 0644,
4153 .proc_handler = proc_dointvec,
4154 },
4155 {
1da177e4
LT		 4156 .procname = "mtu",
4157 .data = &ipv6_devconf.mtu6,
1ab1457c 4158 .maxlen = sizeof(int),
1da177e4 4159 .mode = 0644,
6d9f239a 4160 .proc_handler = proc_dointvec,
1da177e4
LT		 4161 },
4162 {
1da177e4 4163 .procname = "accept_ra",
1ab1457c 4164 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4165 .maxlen = sizeof(int),
4166 .mode = 0644,
6d9f239a 4167 .proc_handler = proc_dointvec,
1da177e4
LT		 4168 },
4169 {
1da177e4 4170 .procname = "accept_redirects",
1ab1457c 4171 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4172 .maxlen = sizeof(int),
4173 .mode = 0644,
6d9f239a 4174 .proc_handler = proc_dointvec,
1da177e4
LT		 4175 },
4176 {
1da177e4 4177 .procname = "autoconf",
1ab1457c 4178 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4179 .maxlen = sizeof(int),
4180 .mode = 0644,
6d9f239a 4181 .proc_handler = proc_dointvec,
1da177e4
LT		 4182 },
4183 {
1da177e4 4184 .procname = "dad_transmits",
1ab1457c 4185 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4186 .maxlen = sizeof(int),
4187 .mode = 0644,
6d9f239a 4188 .proc_handler = proc_dointvec,
1da177e4
LT		 4189 },
4190 {
1da177e4 4191 .procname = "router_solicitations",
1ab1457c 4192 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4193 .maxlen = sizeof(int),
4194 .mode = 0644,
6d9f239a 4195 .proc_handler = proc_dointvec,
1da177e4
LT		 4196 },
4197 {
1da177e4 4198 .procname = "router_solicitation_interval",
1ab1457c 4199 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4200 .maxlen = sizeof(int),
4201 .mode = 0644,
6d9f239a 4202 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4203 },
4204 {
1da177e4 4205 .procname = "router_solicitation_delay",
1ab1457c 4206 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4207 .maxlen = sizeof(int),
4208 .mode = 0644,
6d9f239a 4209 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4210 },
4211 {
1da177e4 4212 .procname = "force_mld_version",
1ab1457c 4213 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4214 .maxlen = sizeof(int),
4215 .mode = 0644,
6d9f239a 4216 .proc_handler = proc_dointvec,
1da177e4
LT		 4217 },
4218#ifdef CONFIG_IPV6_PRIVACY
4219 {
1da177e4 4220 .procname = "use_tempaddr",
1ab1457c 4221 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4222 .maxlen = sizeof(int),
4223 .mode = 0644,
6d9f239a 4224 .proc_handler = proc_dointvec,
1da177e4
LT		 4225 },
4226 {
1da177e4 4227 .procname = "temp_valid_lft",
1ab1457c 4228 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4229 .maxlen = sizeof(int),
4230 .mode = 0644,
6d9f239a 4231 .proc_handler = proc_dointvec,
1da177e4
LT		 4232 },
4233 {
1da177e4 4234 .procname = "temp_prefered_lft",
1ab1457c 4235 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4236 .maxlen = sizeof(int),
4237 .mode = 0644,
6d9f239a 4238 .proc_handler = proc_dointvec,
1da177e4
LT		 4239 },
4240 {
1da177e4 4241 .procname = "regen_max_retry",
1ab1457c 4242 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4243 .maxlen = sizeof(int),
4244 .mode = 0644,
6d9f239a 4245 .proc_handler = proc_dointvec,
1da177e4
LT		 4246 },
4247 {
1da177e4 4248 .procname = "max_desync_factor",
1ab1457c 4249 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4250 .maxlen = sizeof(int),
4251 .mode = 0644,
6d9f239a 4252 .proc_handler = proc_dointvec,
1da177e4
LT		 4253 },
4254#endif
4255 {
1da177e4
LT		 4256 .procname = "max_addresses",
4257 .data = &ipv6_devconf.max_addresses,
4258 .maxlen = sizeof(int),
4259 .mode = 0644,
6d9f239a 4260 .proc_handler = proc_dointvec,
1da177e4 4261 },
65f5c7c1 4262 {
65f5c7c1 4263 .procname = "accept_ra_defrtr",
1ab1457c 4264 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4265 .maxlen = sizeof(int),
4266 .mode = 0644,
6d9f239a 4267 .proc_handler = proc_dointvec,
65f5c7c1 4268 },
c4fd30eb 4269 {
c4fd30eb 4270 .procname = "accept_ra_pinfo",
1ab1457c 4271 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4272 .maxlen = sizeof(int),
4273 .mode = 0644,
6d9f239a 4274 .proc_handler = proc_dointvec,
c4fd30eb 4275 },
930d6ff2
YH		 4276#ifdef CONFIG_IPV6_ROUTER_PREF
4277 {
930d6ff2
YH		 4278 .procname = "accept_ra_rtr_pref",
4279 .data = &ipv6_devconf.accept_ra_rtr_pref,
4280 .maxlen = sizeof(int),
4281 .mode = 0644,
6d9f239a 4282 .proc_handler = proc_dointvec,
930d6ff2 4283 },
52e16356 4284 {
52e16356
YH		 4285 .procname = "router_probe_interval",
4286 .data = &ipv6_devconf.rtr_probe_interval,
4287 .maxlen = sizeof(int),
4288 .mode = 0644,
6d9f239a 4289 .proc_handler = proc_dointvec_jiffies,
52e16356 4290 },
fa03ef38 4291#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4292 {
09c884d4
YH		 4293 .procname = "accept_ra_rt_info_max_plen",
4294 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4295 .maxlen = sizeof(int),
4296 .mode = 0644,
6d9f239a 4297 .proc_handler = proc_dointvec,
09c884d4
YH		 4298 },
4299#endif
930d6ff2 4300#endif
fbea49e1 4301 {
fbea49e1
YH		 4302 .procname = "proxy_ndp",
4303 .data = &ipv6_devconf.proxy_ndp,
4304 .maxlen = sizeof(int),
4305 .mode = 0644,
6d9f239a 4306 .proc_handler = proc_dointvec,
fbea49e1 4307 },
0bcbc926 4308 {
0bcbc926
YH		 4309 .procname = "accept_source_route",
4310 .data = &ipv6_devconf.accept_source_route,
4311 .maxlen = sizeof(int),
4312 .mode = 0644,
6d9f239a 4313 .proc_handler = proc_dointvec,
0bcbc926 4314 },
95c385b4
NH		 4315#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4316 {
95c385b4
NH		 4317 .procname = "optimistic_dad",
4318 .data = &ipv6_devconf.optimistic_dad,
4319 .maxlen = sizeof(int),
4320 .mode = 0644,
6d9f239a 4321 .proc_handler = proc_dointvec,
95c385b4
NH		 4322
4323 },
7bc570c8
YH		 4324#endif
4325#ifdef CONFIG_IPV6_MROUTE
4326 {
7bc570c8
YH		 4327 .procname = "mc_forwarding",
4328 .data = &ipv6_devconf.mc_forwarding,
4329 .maxlen = sizeof(int),
a4e6db07 4330 .mode = 0444,
6d9f239a 4331 .proc_handler = proc_dointvec,
7bc570c8 4332 },
95c385b4 4333#endif
778d80be 4334 {
778d80be
YH		 4335 .procname = "disable_ipv6",
4336 .data = &ipv6_devconf.disable_ipv6,
4337 .maxlen = sizeof(int),
4338 .mode = 0644,
56d417b1 4339 .proc_handler = addrconf_sysctl_disable,
778d80be 4340 },
1b34be74 4341 {
1b34be74
YH		 4342 .procname = "accept_dad",
4343 .data = &ipv6_devconf.accept_dad,
4344 .maxlen = sizeof(int),
4345 .mode = 0644,
6d9f239a 4346 .proc_handler = proc_dointvec,
1b34be74 4347 },
f7734fdf 4348 {
f7734fdf
OP		 4349 .procname = "force_tllao",
4350 .data = &ipv6_devconf.force_tllao,
4351 .maxlen = sizeof(int),
4352 .mode = 0644,
4353 .proc_handler = proc_dointvec
4354 },
1da177e4 4355 {
f8572d8f 4356 /* sentinel */
1da177e4
LT		 4357 }
4358 },
1da177e4
LT		 4359};
4360
bff16c2f 4361static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4362 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4363{
4364 int i;
1da177e4 4365 struct addrconf_sysctl_table *t;
1da177e4 4366
1dab6222
PE		 4367#define ADDRCONF_CTL_PATH_DEV 3
4368
4369 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4370 { .procname = "net", },
4371 { .procname = "ipv6", },
4372 { .procname = "conf", },
1dab6222
PE		 4373 { /* to be set */ },
4374 { },
4375 };
4376
4377
af879cc7 4378 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4379 if (t == NULL)
f68635e6
PE		 4380 goto out;
4381
1da177e4
LT		 4382 for (i=0; t->addrconf_vars[i].data; i++) {
4383 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4384 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4385 t->addrconf_vars[i].extra2 = net;
1da177e4 4386 }
1da177e4 4387
1ab1457c
YH		 4388 /*
4389 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4390 * by sysctl and we wouldn't want anyone to change it under our feet
4391 * (see SIOCSIFNAME).
1ab1457c 4392 */
1dab6222
PE		 4393 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4394 if (!t->dev_name)
f68635e6 4395 goto free;
1da177e4 4396
1dab6222 4397 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4398
bff16c2f 4399 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4400 t->addrconf_vars);
1da177e4
LT		 4401 if (t->sysctl_header == NULL)
4402 goto free_procname;
f68635e6
PE		 4403
4404 p->sysctl = t;
95897312 4405 return 0;
1da177e4 4406
f68635e6 4407free_procname:
1dab6222 4408 kfree(t->dev_name);
f68635e6 4409free:
1da177e4 4410 kfree(t);
f68635e6 4411out:
95897312 4412 return -ENOBUFS;
1da177e4
LT		 4413}
4414
408c4768
PE		 4415static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4416{
4417 struct addrconf_sysctl_table *t;
4418
4419 if (p->sysctl == NULL)
4420 return;
4421
4422 t = p->sysctl;
4423 p->sysctl = NULL;
4424 unregister_sysctl_table(t->sysctl_header);
4425 kfree(t->dev_name);
4426 kfree(t);
4427}
4428
f52295a9
PE		 4429static void addrconf_sysctl_register(struct inet6_dev *idev)
4430{
54716e3b 4431 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4432 &ndisc_ifinfo_sysctl_change);
c346dca1 4433 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4434 idev, &idev->cnf);
f52295a9
PE		 4435}
4436
408c4768 4437static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4438{
408c4768
PE		 4439 __addrconf_sysctl_unregister(&idev->cnf);
4440 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4441}
4442
4443
4444#endif
4445
2c8c1e72 4446static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4447{
4448 int err;
4449 struct ipv6_devconf *all, *dflt;
4450
4451 err = -ENOMEM;
4452 all = &ipv6_devconf;
4453 dflt = &ipv6_devconf_dflt;
4454
09ad9bc7 4455 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4456 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4457 if (all == NULL)
4458 goto err_alloc_all;
4459
4460 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4461 if (dflt == NULL)
4462 goto err_alloc_dflt;
56d417b1
BH		 4463 } else {
4464 /* these will be inherited by all namespaces */
4465 dflt->autoconf = ipv6_defaults.autoconf;
4466 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4467 }
4468
4469 net->ipv6.devconf_all = all;
4470 net->ipv6.devconf_dflt = dflt;
4471
4472#ifdef CONFIG_SYSCTL
f8572d8f 4473 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4474 if (err < 0)
4475 goto err_reg_all;
4476
f8572d8f 4477 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4478 if (err < 0)
4479 goto err_reg_dflt;
4480#endif
4481 return 0;
4482
4483#ifdef CONFIG_SYSCTL
4484err_reg_dflt:
4485 __addrconf_sysctl_unregister(all);
4486err_reg_all:
4487 kfree(dflt);
4488#endif
4489err_alloc_dflt:
4490 kfree(all);
4491err_alloc_all:
4492 return err;
4493}
4494
2c8c1e72 4495static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4496{
4497#ifdef CONFIG_SYSCTL
4498 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4499 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4500#endif
09ad9bc7 4501 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4502 kfree(net->ipv6.devconf_dflt);
4503 kfree(net->ipv6.devconf_all);
4504 }
4505}
4506
4507static struct pernet_operations addrconf_ops = {
4508 .init = addrconf_init_net,
4509 .exit = addrconf_exit_net,
4510};
4511
1da177e4
LT		 4512/*
4513 * Device notifier
4514 */
4515
4516int register_inet6addr_notifier(struct notifier_block *nb)
4517{
1ab1457c 4518 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4519}
4520
7159039a
YH		 4521EXPORT_SYMBOL(register_inet6addr_notifier);
4522
1da177e4
LT		 4523int unregister_inet6addr_notifier(struct notifier_block *nb)
4524{
1ab1457c 4525 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4526}
4527
7159039a
YH		 4528EXPORT_SYMBOL(unregister_inet6addr_notifier);
4529
1da177e4
LT		 4530/*
4531 * Init / cleanup code
4532 */
4533
4534int __init addrconf_init(void)
4535{
2a8cc6c8
YH		 4536 int err;
4537
4538 if ((err = ipv6_addr_label_init()) < 0) {
4539 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4540 err);
4541 return err;
4542 }
1da177e4 4543
e0da5a48
PE		 4544 register_pernet_subsys(&addrconf_ops);
4545
1da177e4
LT		 4546 /* The addrconf netdev notifier requires that loopback_dev
4547 * has it's ipv6 private information allocated and setup
4548 * before it can bring up and give link-local addresses
4549 * to other devices which are up.
4550 *
4551 * Unfortunately, loopback_dev is not necessarily the first
4552 * entry in the global dev_base list of net devices. In fact,
4553 * it is likely to be the very last entry on that list.
4554 * So this causes the notifier registry below to try and
4555 * give link-local addresses to all devices besides loopback_dev
4556 * first, then loopback_dev, which cases all the non-loopback_dev
4557 * devices to fail to get a link-local address.
4558 *
4559 * So, as a temporary fix, allocate the ipv6 structure for
4560 * loopback_dev first by hand.
4561 * Longer term, all of the dependencies ipv6 has upon the loopback
4562 * device and it being up should be removed.
4563 */
4564 rtnl_lock();
2774c7ab 4565 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4566 err = -ENOMEM;
4567 rtnl_unlock();
4568 if (err)
e0da5a48 4569 goto errlo;
1da177e4
LT		 4570
4571 register_netdevice_notifier(&ipv6_dev_notf);
4572
1da177e4 4573 addrconf_verify(0);
c127ea2c
TG		 4574
4575 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4576 if (err < 0)
4577 goto errout;
4578
4579 /* Only the first call to __rtnl_register can fail */
4580 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4581 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4582 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4583 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4584 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4585
2a8cc6c8
YH		 4586 ipv6_addr_label_rtnl_register();
4587
1da177e4 4588 return 0;
c127ea2c
TG		 4589errout:
4590 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4591errlo:
4592 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4593
4594 return err;
1da177e4
LT		 4595}
4596
09f7709f 4597void addrconf_cleanup(void)
1da177e4 4598{
1ab1457c 4599 struct inet6_ifaddr *ifa;
176c39af 4600 struct net_device *dev;
1da177e4
LT		 4601 int i;
4602
4603 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4604 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4605
4606 rtnl_lock();
4607
176c39af
DL		 4608 /* clean dev list */
4609 for_each_netdev(&init_net, dev) {
4610 if (__in6_dev_get(dev) == NULL)
4611 continue;
4612 addrconf_ifdown(dev, 1);
4613 }
4614 addrconf_ifdown(init_net.loopback_dev, 2);
4615
1da177e4
LT		 4616 /*
4617 * Check hash table.
4618 */
1da177e4
LT		 4619 write_lock_bh(&addrconf_hash_lock);
4620 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4621 for (ifa=inet6_addr_lst[i]; ifa; ) {
4622 struct inet6_ifaddr *bifa;
4623
4624 bifa = ifa;
4625 ifa = ifa->lst_next;
4626 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4627 /* Do not free it; something is wrong.
4628 Now we can investigate it with debugger.
4629 */
4630 }
4631 }
4632 write_unlock_bh(&addrconf_hash_lock);
4633
4634 del_timer(&addr_chk_timer);
1da177e4 4635 rtnl_unlock();
1da177e4 4636}
Clone of davem's net-next-2.6 tree