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ipv6: convert addrconf list to hlist
[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 */
c2e21293 129static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
1da177e4
LT		 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
93d9b7d7
JP		 140static void addrconf_type_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
372e6c8f 404 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 406 if ((dev->flags&IFF_LOOPBACK) ||
407 dev->type == ARPHRD_TUNNEL ||
9625ed72 408 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 409 dev->type == ARPHRD_SIT ||
0be669bb 410 dev->type == ARPHRD_NONE) {
322f74a4
IO		 411 printk(KERN_INFO
412 "%s: Disabled Privacy Extensions\n",
413 dev->name);
414 ndev->cnf.use_tempaddr = -1;
415 } else {
416 in6_dev_hold(ndev);
417 ipv6_regen_rndid((unsigned long) ndev);
418 }
1da177e4
LT		 419#endif
420
f24e3d65 421 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 422 ndev->if_flags |= IF_READY;
423
322f74a4
IO		 424 ipv6_mc_init_dev(ndev);
425 ndev->tstamp = jiffies;
f52295a9 426 addrconf_sysctl_register(ndev);
30c4cf57
DS		 427 /* protected by rtnl_lock */
428 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 429
430 /* Join all-node multicast group */
f3ee4010 431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 432
1da177e4
LT		 433 return ndev;
434}
435
cee89473 436static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 437{
438 struct inet6_dev *idev;
439
440 ASSERT_RTNL();
441
442 if ((idev = __in6_dev_get(dev)) == NULL) {
443 if ((idev = ipv6_add_dev(dev)) == NULL)
444 return NULL;
445 }
c5e33bdd 446
1da177e4
LT		 447 if (dev->flags&IFF_UP)
448 ipv6_mc_up(idev);
449 return idev;
450}
451
452#ifdef CONFIG_SYSCTL
453static void dev_forward_change(struct inet6_dev *idev)
454{
455 struct net_device *dev;
456 struct inet6_ifaddr *ifa;
1da177e4
LT		 457
458 if (!idev)
459 return;
460 dev = idev->dev;
0187bdfb
BH		 461 if (idev->cnf.forwarding)
462 dev_disable_lro(dev);
1da177e4 463 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 464 if (idev->cnf.forwarding)
f3ee4010 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 466 else
f3ee4010 467 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 468 }
469 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 470 if (ifa->flags&IFA_F_TENTATIVE)
471 continue;
1da177e4
LT		 472 if (idev->cnf.forwarding)
473 addrconf_join_anycast(ifa);
474 else
475 addrconf_leave_anycast(ifa);
476 }
477}
478
479
e186932b 480static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 481{
482 struct net_device *dev;
483 struct inet6_dev *idev;
484
c6d14c84
ED		 485 rcu_read_lock();
486 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 487 idev = __in6_dev_get(dev);
488 if (idev) {
e186932b
PE		 489 int changed = (!idev->cnf.forwarding) ^ (!newf);
490 idev->cnf.forwarding = newf;
1da177e4
LT		 491 if (changed)
492 dev_forward_change(idev);
493 }
1da177e4 494 }
c6d14c84 495 rcu_read_unlock();
1da177e4 496}
c8fecf22 497
b325fddb 498static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 499{
bff16c2f
PE		 500 struct net *net;
501
502 net = (struct net *)table->extra2;
441fc2a2 503 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 504 return 0;
505
88af182e
EB		 506 if (!rtnl_trylock()) {
507 /* Restore the original values before restarting */
508 *p = old;
5007392d 509 return restart_syscall();
88af182e 510 }
c8fecf22 511
e186932b
PE		 512 if (p == &net->ipv6.devconf_all->forwarding) {
513 __s32 newf = net->ipv6.devconf_all->forwarding;
514 net->ipv6.devconf_dflt->forwarding = newf;
515 addrconf_forward_change(net, newf);
c8fecf22
PE		 516 } else if ((!*p) ^ (!old))
517 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 518 rtnl_unlock();
c8fecf22
PE		 519
520 if (*p)
7b4da532 521 rt6_purge_dflt_routers(net);
b325fddb 522 return 1;
c8fecf22 523}
1da177e4
LT		 524#endif
525
526/* Nobody refers to this ifaddr, destroy it */
527
528void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
529{
547b792c 530 WARN_ON(ifp->if_next != NULL);
c2e21293 531 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 532
1da177e4
LT		 533#ifdef NET_REFCNT_DEBUG
534 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
535#endif
536
537 in6_dev_put(ifp->idev);
538
539 if (del_timer(&ifp->timer))
540 printk("Timer is still running, when freeing ifa=%p\n", ifp);
541
542 if (!ifp->dead) {
543 printk("Freeing alive inet6 address %p\n", ifp);
544 return;
545 }
546 dst_release(&ifp->rt->u.dst);
547
548 kfree(ifp);
549}
550
e55ffac6
BH		 551static void
552ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
553{
554 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 555 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 556
557 /*
558 * Each device address list is sorted in order of scope -
559 * global before linklocal.
560 */
561 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
562 ifap = &ifa->if_next) {
8a6ce0c0 563 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 564 break;
565 }
566
567 ifp->if_next = *ifap;
568 *ifap = ifp;
569}
570
3eb84f49
YH		 571/*
572 * Hash function taken from net_alias.c
573 */
574static u8 ipv6_addr_hash(const struct in6_addr *addr)
575{
576 __u32 word;
577
578 /*
579 * We perform the hash function over the last 64 bits of the address
580 * This will include the IEEE address token on links that support it.
581 */
582
583 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
584 word ^= (word >> 16);
585 word ^= (word >> 8);
586
587 return ((word ^ (word >> 4)) & 0x0f);
588}
589
1da177e4
LT		 590/* On success it returns ifp with increased reference count */
591
592static struct inet6_ifaddr *
593ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 594 int scope, u32 flags)
1da177e4
LT		 595{
596 struct inet6_ifaddr *ifa = NULL;
597 struct rt6_info *rt;
598 int hash;
599 int err = 0;
d68b8270
YH		 600 int addr_type = ipv6_addr_type(addr);
601
602 if (addr_type == IPV6_ADDR_ANY ||
603 addr_type & IPV6_ADDR_MULTICAST ||
604 (!(idev->dev->flags & IFF_LOOPBACK) &&
605 addr_type & IPV6_ADDR_LOOPBACK))
606 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 607
8814c4b5 608 rcu_read_lock_bh();
1da177e4
LT		 609 if (idev->dead) {
610 err = -ENODEV; /*XXX*/
611 goto out2;
612 }
613
56d417b1 614 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 615 err = -EACCES;
616 goto out2;
617 }
618
1da177e4
LT		 619 write_lock(&addrconf_hash_lock);
620
621 /* Ignore adding duplicate addresses on an interface */
c346dca1 622 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 623 ADBG(("ipv6_add_addr: already assigned\n"));
624 err = -EEXIST;
625 goto out;
626 }
627
322f74a4 628 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 629
630 if (ifa == NULL) {
631 ADBG(("ipv6_add_addr: malloc failed\n"));
632 err = -ENOBUFS;
633 goto out;
634 }
635
636 rt = addrconf_dst_alloc(idev, addr, 0);
637 if (IS_ERR(rt)) {
638 err = PTR_ERR(rt);
639 goto out;
640 }
641
1da177e4
LT		 642 ipv6_addr_copy(&ifa->addr, addr);
643
644 spin_lock_init(&ifa->lock);
645 init_timer(&ifa->timer);
c2e21293 646 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 647 ifa->timer.data = (unsigned long) ifa;
648 ifa->scope = scope;
649 ifa->prefix_len = pfxlen;
650 ifa->flags = flags | IFA_F_TENTATIVE;
651 ifa->cstamp = ifa->tstamp = jiffies;
652
57f5f544
KF		 653 ifa->rt = rt;
654
95c385b4
NH		 655 /*
656 * part one of RFC 4429, section 3.3
657 * We should not configure an address as
658 * optimistic if we do not yet know the link
659 * layer address of our nexhop router
660 */
661
662 if (rt->rt6i_nexthop == NULL)
663 ifa->flags &= ~IFA_F_OPTIMISTIC;
664
1da177e4
LT		 665 ifa->idev = idev;
666 in6_dev_hold(idev);
667 /* For caller */
668 in6_ifa_hold(ifa);
669
670 /* Add to big hash table */
671 hash = ipv6_addr_hash(addr);
672
c2e21293 673 hlist_add_head(&ifa->addr_lst, &inet6_addr_lst[hash]);
1da177e4
LT		 674 in6_ifa_hold(ifa);
675 write_unlock(&addrconf_hash_lock);
676
677 write_lock(&idev->lock);
678 /* Add to inet6_dev unicast addr list. */
e55ffac6 679 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 680
681#ifdef CONFIG_IPV6_PRIVACY
682 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 683 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 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);
c2e21293 721 hlist_del_init(&ifp->addr_lst);
722 __in6_ifa_put(ifp);
1da177e4
LT		 723 write_unlock_bh(&addrconf_hash_lock);
724
725 write_lock_bh(&idev->lock);
726#ifdef CONFIG_IPV6_PRIVACY
727 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 728 list_del(&ifp->tmp_list);
729 if (ifp->ifpub) {
730 in6_ifa_put(ifp->ifpub);
731 ifp->ifpub = NULL;
1da177e4 732 }
372e6c8f 733 __in6_ifa_put(ifp);
1da177e4
LT		 734 }
735#endif
736
1d142804 737 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 738 if (ifa == ifp) {
739 *ifap = ifa->if_next;
740 __in6_ifa_put(ifp);
741 ifa->if_next = NULL;
742 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
743 break;
744 deleted = 1;
1d142804 745 continue;
1da177e4
LT		 746 } else if (ifp->flags & IFA_F_PERMANENT) {
747 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
748 ifp->prefix_len)) {
749 if (ifa->flags & IFA_F_PERMANENT) {
750 onlink = 1;
751 if (deleted)
752 break;
753 } else {
754 unsigned long lifetime;
755
756 if (!onlink)
757 onlink = -1;
758
759 spin_lock(&ifa->lock);
4bed72e4
YH		 760
761 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
762 /*
763 * Note: Because this address is
764 * not permanent, lifetime <
765 * LONG_MAX / HZ here.
766 */
1da177e4
LT		 767 if (time_before(expires,
768 ifa->tstamp + lifetime * HZ))
769 expires = ifa->tstamp + lifetime * HZ;
770 spin_unlock(&ifa->lock);
771 }
772 }
773 }
1d142804 774 ifap = &ifa->if_next;
1da177e4
LT		 775 }
776 write_unlock_bh(&idev->lock);
777
b2238566
AV		 778 addrconf_del_timer(ifp);
779
1da177e4
LT		 780 ipv6_ifa_notify(RTM_DELADDR, ifp);
781
e041c683 782 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 783
1da177e4
LT		 784 /*
785 * Purge or update corresponding prefix
786 *
787 * 1) we don't purge prefix here if address was not permanent.
788 * prefix is managed by its own lifetime.
789 * 2) if there're no addresses, delete prefix.
790 * 3) if there're still other permanent address(es),
791 * corresponding prefix is still permanent.
792 * 4) otherwise, update prefix lifetime to the
793 * longest valid lifetime among the corresponding
794 * addresses on the device.
795 * Note: subsequent RA will update lifetime.
796 *
797 * --yoshfuji
798 */
799 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
800 struct in6_addr prefix;
801 struct rt6_info *rt;
c346dca1 802 struct net *net = dev_net(ifp->idev->dev);
1da177e4 803 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 804 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 805
2b5ead46 806 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 807 if (onlink == 0) {
e0a1ad73 808 ip6_del_rt(rt);
1da177e4
LT		 809 rt = NULL;
810 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
811 rt->rt6i_expires = expires;
812 rt->rt6i_flags |= RTF_EXPIRES;
813 }
814 }
815 dst_release(&rt->u.dst);
816 }
817
818 in6_ifa_put(ifp);
819}
820
821#ifdef CONFIG_IPV6_PRIVACY
822static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
823{
824 struct inet6_dev *idev = ifp->idev;
825 struct in6_addr addr, *tmpaddr;
826 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 827 unsigned long regen_advance;
1da177e4
LT		 828 int tmp_plen;
829 int ret = 0;
830 int max_addresses;
95c385b4 831 u32 addr_flags;
1da177e4
LT		 832
833 write_lock(&idev->lock);
834 if (ift) {
835 spin_lock_bh(&ift->lock);
836 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
837 spin_unlock_bh(&ift->lock);
838 tmpaddr = &addr;
839 } else {
840 tmpaddr = NULL;
841 }
842retry:
843 in6_dev_hold(idev);
844 if (idev->cnf.use_tempaddr <= 0) {
845 write_unlock(&idev->lock);
846 printk(KERN_INFO
847 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
848 in6_dev_put(idev);
849 ret = -1;
850 goto out;
851 }
852 spin_lock_bh(&ifp->lock);
853 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
854 idev->cnf.use_tempaddr = -1; /*XXX*/
855 spin_unlock_bh(&ifp->lock);
856 write_unlock(&idev->lock);
857 printk(KERN_WARNING
858 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
859 in6_dev_put(idev);
860 ret = -1;
861 goto out;
862 }
863 in6_ifa_hold(ifp);
864 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
865 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
866 spin_unlock_bh(&ifp->lock);
867 write_unlock(&idev->lock);
868 printk(KERN_WARNING
869 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
870 in6_ifa_put(ifp);
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 memcpy(&addr.s6_addr[8], idev->rndid, 8);
876 tmp_valid_lft = min_t(__u32,
877 ifp->valid_lft,
878 idev->cnf.temp_valid_lft);
1ab1457c
YH		 879 tmp_prefered_lft = min_t(__u32,
880 ifp->prefered_lft,
1da177e4
LT		 881 idev->cnf.temp_prefered_lft - desync_factor / HZ);
882 tmp_plen = ifp->prefix_len;
883 max_addresses = idev->cnf.max_addresses;
884 tmp_cstamp = ifp->cstamp;
885 tmp_tstamp = ifp->tstamp;
886 spin_unlock_bh(&ifp->lock);
887
eac55bf9
BB		 888 regen_advance = idev->cnf.regen_max_retry *
889 idev->cnf.dad_transmits *
890 idev->nd_parms->retrans_time / HZ;
1da177e4 891 write_unlock(&idev->lock);
95c385b4 892
eac55bf9
BB		 893 /* A temporary address is created only if this calculated Preferred
894 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
895 * an implementation must not create a temporary address with a zero
896 * Preferred Lifetime.
897 */
898 if (tmp_prefered_lft <= regen_advance) {
899 in6_ifa_put(ifp);
900 in6_dev_put(idev);
901 ret = -1;
902 goto out;
903 }
904
95c385b4
NH		 905 addr_flags = IFA_F_TEMPORARY;
906 /* set in addrconf_prefix_rcv() */
907 if (ifp->flags & IFA_F_OPTIMISTIC)
908 addr_flags |= IFA_F_OPTIMISTIC;
909
1da177e4 910 ift = !max_addresses ||
1ab1457c 911 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 912 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 913 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
914 addr_flags) : NULL;
1da177e4
LT		 915 if (!ift || IS_ERR(ift)) {
916 in6_ifa_put(ifp);
917 in6_dev_put(idev);
918 printk(KERN_INFO
919 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
920 tmpaddr = &addr;
921 write_lock(&idev->lock);
922 goto retry;
923 }
924
925 spin_lock_bh(&ift->lock);
926 ift->ifpub = ifp;
927 ift->valid_lft = tmp_valid_lft;
928 ift->prefered_lft = tmp_prefered_lft;
929 ift->cstamp = tmp_cstamp;
930 ift->tstamp = tmp_tstamp;
931 spin_unlock_bh(&ift->lock);
932
933 addrconf_dad_start(ift, 0);
934 in6_ifa_put(ift);
935 in6_dev_put(idev);
936out:
937 return ret;
938}
939#endif
940
941/*
072047e4 942 * Choose an appropriate source address (RFC3484)
1da177e4 943 */
a9b05723
YH		 944enum {
945 IPV6_SADDR_RULE_INIT = 0,
946 IPV6_SADDR_RULE_LOCAL,
947 IPV6_SADDR_RULE_SCOPE,
948 IPV6_SADDR_RULE_PREFERRED,
949#ifdef CONFIG_IPV6_MIP6
950 IPV6_SADDR_RULE_HOA,
951#endif
952 IPV6_SADDR_RULE_OIF,
953 IPV6_SADDR_RULE_LABEL,
954#ifdef CONFIG_IPV6_PRIVACY
955 IPV6_SADDR_RULE_PRIVACY,
956#endif
957 IPV6_SADDR_RULE_ORCHID,
958 IPV6_SADDR_RULE_PREFIX,
959 IPV6_SADDR_RULE_MAX
960};
961
072047e4 962struct ipv6_saddr_score {
a9b05723
YH		 963 int rule;
964 int addr_type;
965 struct inet6_ifaddr *ifa;
966 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
967 int scopedist;
968 int matchlen;
072047e4
YH		 969};
970
a9b05723 971struct ipv6_saddr_dst {
9acd9f3a 972 const struct in6_addr *addr;
a9b05723
YH		 973 int ifindex;
974 int scope;
975 int label;
7cbca67c 976 unsigned int prefs;
a9b05723 977};
072047e4 978
b6f99a21 979static inline int ipv6_saddr_preferred(int type)
1da177e4 980{
45bb0060 981 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 982 return 1;
983 return 0;
1da177e4
LT		 984}
985
3de23255
BT		 986static int ipv6_get_saddr_eval(struct net *net,
987 struct ipv6_saddr_score *score,
a9b05723
YH		 988 struct ipv6_saddr_dst *dst,
989 int i)
990{
991 int ret;
992
993 if (i <= score->rule) {
994 switch (i) {
995 case IPV6_SADDR_RULE_SCOPE:
996 ret = score->scopedist;
997 break;
998 case IPV6_SADDR_RULE_PREFIX:
999 ret = score->matchlen;
1000 break;
1001 default:
1002 ret = !!test_bit(i, score->scorebits);
1003 }
1004 goto out;
1005 }
1006
1007 switch (i) {
1008 case IPV6_SADDR_RULE_INIT:
1009 /* Rule 0: remember if hiscore is not ready yet */
1010 ret = !!score->ifa;
1011 break;
1012 case IPV6_SADDR_RULE_LOCAL:
1013 /* Rule 1: Prefer same address */
1014 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1015 break;
1016 case IPV6_SADDR_RULE_SCOPE:
1017 /* Rule 2: Prefer appropriate scope
1018 *
1019 * ret
1020 * ^
1021 * -1 | d 15
1022 * ---+--+-+---> scope
1023 * |
1024 * | d is scope of the destination.
1025 * B-d | \
1026 * | \ <- smaller scope is better if
1027 * B-15 | \ if scope is enough for destinaion.
1028 * | ret = B - scope (-1 <= scope >= d <= 15).
1029 * d-C-1 | /
1030 * |/ <- greater is better
1031 * -C / if scope is not enough for destination.
1032 * /| ret = scope - C (-1 <= d < scope <= 15).
1033 *
1034 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1035 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1036 * Assume B = 0 and we get C > 29.
1037 */
1038 ret = __ipv6_addr_src_scope(score->addr_type);
1039 if (ret >= dst->scope)
1040 ret = -ret;
1041 else
1042 ret -= 128; /* 30 is enough */
1043 score->scopedist = ret;
1044 break;
1045 case IPV6_SADDR_RULE_PREFERRED:
1046 /* Rule 3: Avoid deprecated and optimistic addresses */
1047 ret = ipv6_saddr_preferred(score->addr_type) ||
1048 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1049 break;
1050#ifdef CONFIG_IPV6_MIP6
1051 case IPV6_SADDR_RULE_HOA:
7cbca67c 1052 {
a9b05723 1053 /* Rule 4: Prefer home address */
7cbca67c
YH		 1054 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1055 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1056 break;
7cbca67c 1057 }
a9b05723
YH		 1058#endif
1059 case IPV6_SADDR_RULE_OIF:
1060 /* Rule 5: Prefer outgoing interface */
1061 ret = (!dst->ifindex ||
1062 dst->ifindex == score->ifa->idev->dev->ifindex);
1063 break;
1064 case IPV6_SADDR_RULE_LABEL:
1065 /* Rule 6: Prefer matching label */
3de23255
BT		 1066 ret = ipv6_addr_label(net,
1067 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1068 score->ifa->idev->dev->ifindex) == dst->label;
1069 break;
1070#ifdef CONFIG_IPV6_PRIVACY
1071 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1072 {
a9b05723
YH		 1073 /* Rule 7: Prefer public address
1074 * Note: prefer temprary address if use_tempaddr >= 2
1075 */
7cbca67c
YH		 1076 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1077 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1078 score->ifa->idev->cnf.use_tempaddr >= 2;
1079 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1080 break;
7cbca67c 1081 }
a9b05723
YH		 1082#endif
1083 case IPV6_SADDR_RULE_ORCHID:
1084 /* Rule 8-: Prefer ORCHID vs ORCHID or
1085 * non-ORCHID vs non-ORCHID
1086 */
1087 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1088 ipv6_addr_orchid(dst->addr));
1089 break;
1090 case IPV6_SADDR_RULE_PREFIX:
1091 /* Rule 8: Use longest matching prefix */
1092 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1093 dst->addr);
1094 break;
1095 default:
1096 ret = 0;
1097 }
1098
1099 if (ret)
1100 __set_bit(i, score->scorebits);
1101 score->rule = i;
1102out:
1103 return ret;
1104}
1105
191cd582 1106int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1107 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1108 struct in6_addr *saddr)
1da177e4 1109{
a9b05723
YH		 1110 struct ipv6_saddr_score scores[2],
1111 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1112 struct ipv6_saddr_dst dst;
072047e4 1113 struct net_device *dev;
a9b05723 1114 int dst_type;
1da177e4 1115
a9b05723
YH		 1116 dst_type = __ipv6_addr_type(daddr);
1117 dst.addr = daddr;
1118 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1119 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1120 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1121 dst.prefs = prefs;
a9b05723
YH		 1122
1123 hiscore->rule = -1;
1124 hiscore->ifa = NULL;
1da177e4 1125
8814c4b5 1126 rcu_read_lock();
1da177e4 1127
c6d14c84 1128 for_each_netdev_rcu(net, dev) {
072047e4 1129 struct inet6_dev *idev;
072047e4 1130
a9b05723 1131 /* Candidate Source Address (section 4)
072047e4
YH		 1132 * - multicast and link-local destination address,
1133 * the set of candidate source address MUST only
1134 * include addresses assigned to interfaces
1135 * belonging to the same link as the outgoing
1136 * interface.
1137 * (- For site-local destination addresses, the
1138 * set of candidate source addresses MUST only
1139 * include addresses assigned to interfaces
1140 * belonging to the same site as the outgoing
1141 * interface.)
1142 */
a9b05723
YH		 1143 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1144 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1145 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1146 continue;
1da177e4 1147
1da177e4 1148 idev = __in6_dev_get(dev);
072047e4
YH		 1149 if (!idev)
1150 continue;
1151
1152 read_lock_bh(&idev->lock);
a9b05723
YH		 1153 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1154 int i;
072047e4 1155
a9b05723 1156 /*
6b3ae80a
YH		 1157 * - Tentative Address (RFC2462 section 5.4)
1158 * - A tentative address is not considered
1159 * "assigned to an interface" in the traditional
95c385b4 1160 * sense, unless it is also flagged as optimistic.
6b3ae80a 1161 * - Candidate Source Address (section 4)
072047e4
YH		 1162 * - In any case, anycast addresses, multicast
1163 * addresses, and the unspecified address MUST
1164 * NOT be included in a candidate set.
1165 */
a9b05723
YH		 1166 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1167 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1168 continue;
a9b05723
YH		 1169
1170 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1171
1172 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1173 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1174 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1175 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1176 "assigned as unicast address on %s",
1177 dev->name);
1178 continue;
1179 }
1180
a9b05723
YH		 1181 score->rule = -1;
1182 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1183
1184 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1185 int minihiscore, miniscore;
1186
3de23255
BT		 1187 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1188 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1189
1190 if (minihiscore > miniscore) {
1191 if (i == IPV6_SADDR_RULE_SCOPE &&
1192 score->scopedist > 0) {
1193 /*
1194 * special case:
1195 * each remaining entry
1196 * has too small (not enough)
1197 * scope, because ifa entries
1198 * are sorted by their scope
1199 * values.
1200 */
1201 goto try_nextdev;
1202 }
1203 break;
1204 } else if (minihiscore < miniscore) {
a9b05723
YH		 1205 if (hiscore->ifa)
1206 in6_ifa_put(hiscore->ifa);
1207
1208 in6_ifa_hold(score->ifa);
1209
a0bffffc 1210 swap(hiscore, score);
a9b05723
YH		 1211
1212 /* restore our iterator */
1213 score->ifa = hiscore->ifa;
1214
1215 break;
1da177e4 1216 }
072047e4 1217 }
1da177e4 1218 }
a9b05723 1219try_nextdev:
072047e4 1220 read_unlock_bh(&idev->lock);
1da177e4 1221 }
8814c4b5 1222 rcu_read_unlock();
1da177e4 1223
a9b05723 1224 if (!hiscore->ifa)
072047e4 1225 return -EADDRNOTAVAIL;
1ab1457c 1226
a9b05723
YH		 1227 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1228 in6_ifa_put(hiscore->ifa);
072047e4 1229 return 0;
1da177e4
LT		 1230}
1231
5e5f3f0f 1232EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1233
95c385b4
NH		 1234int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1235 unsigned char banned_flags)
1da177e4
LT		 1236{
1237 struct inet6_dev *idev;
1238 int err = -EADDRNOTAVAIL;
1239
8814c4b5 1240 rcu_read_lock();
1da177e4
LT		 1241 if ((idev = __in6_dev_get(dev)) != NULL) {
1242 struct inet6_ifaddr *ifp;
1243
1244 read_lock_bh(&idev->lock);
1245 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1246 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1247 ipv6_addr_copy(addr, &ifp->addr);
1248 err = 0;
1249 break;
1250 }
1251 }
1252 read_unlock_bh(&idev->lock);
1253 }
8814c4b5 1254 rcu_read_unlock();
1da177e4
LT		 1255 return err;
1256}
1257
1258static int ipv6_count_addresses(struct inet6_dev *idev)
1259{
1260 int cnt = 0;
1261 struct inet6_ifaddr *ifp;
1262
1263 read_lock_bh(&idev->lock);
1264 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1265 cnt++;
1266 read_unlock_bh(&idev->lock);
1267 return cnt;
1268}
1269
bfeade08
DL		 1270int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1271 struct net_device *dev, int strict)
1da177e4 1272{
c2e21293 1273 struct inet6_ifaddr *ifp = NULL;
1274 struct hlist_node *node;
1da177e4
LT		 1275 u8 hash = ipv6_addr_hash(addr);
1276
1277 read_lock_bh(&addrconf_hash_lock);
c2e21293 1278 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1279 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1280 continue;
1da177e4
LT		 1281 if (ipv6_addr_equal(&ifp->addr, addr) &&
1282 !(ifp->flags&IFA_F_TENTATIVE)) {
1283 if (dev == NULL || ifp->idev->dev == dev ||
1284 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1285 break;
1286 }
1287 }
1288 read_unlock_bh(&addrconf_hash_lock);
1289 return ifp != NULL;
1290}
7159039a
YH		 1291EXPORT_SYMBOL(ipv6_chk_addr);
1292
1da177e4 1293static
06bfe655
DL		 1294int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1295 struct net_device *dev)
1da177e4 1296{
c2e21293 1297 struct inet6_ifaddr *ifp;
1298 struct hlist_node *node;
1da177e4
LT		 1299 u8 hash = ipv6_addr_hash(addr);
1300
c2e21293 1301 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1302 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1303 continue;
1da177e4
LT		 1304 if (ipv6_addr_equal(&ifp->addr, addr)) {
1305 if (dev == NULL || ifp->idev->dev == dev)
1306 break;
1307 }
1308 }
1309 return ifp != NULL;
1310}
1311
52eeeb84
YH		 1312int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1313{
1314 struct inet6_dev *idev;
1315 struct inet6_ifaddr *ifa;
1316 int onlink;
1317
1318 onlink = 0;
1319 rcu_read_lock();
1320 idev = __in6_dev_get(dev);
1321 if (idev) {
1322 read_lock_bh(&idev->lock);
1323 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1324 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1325 ifa->prefix_len);
1326 if (onlink)
1327 break;
1328 }
1329 read_unlock_bh(&idev->lock);
1330 }
1331 rcu_read_unlock();
1332 return onlink;
1333}
1334
1335EXPORT_SYMBOL(ipv6_chk_prefix);
1336
9acd9f3a 1337struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1338 struct net_device *dev, int strict)
1da177e4 1339{
c2e21293 1340 struct inet6_ifaddr *ifp = NULL;
1341 struct hlist_node *node;
1da177e4
LT		 1342 u8 hash = ipv6_addr_hash(addr);
1343
1344 read_lock_bh(&addrconf_hash_lock);
c2e21293 1345 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1346 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1347 continue;
1da177e4
LT		 1348 if (ipv6_addr_equal(&ifp->addr, addr)) {
1349 if (dev == NULL || ifp->idev->dev == dev ||
1350 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1351 in6_ifa_hold(ifp);
1352 break;
1353 }
1354 }
1355 }
1356 read_unlock_bh(&addrconf_hash_lock);
1357
1358 return ifp;
1359}
1360
1da177e4
LT		 1361/* Gets referenced address, destroys ifaddr */
1362
cc411d0b 1363static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1364{
1da177e4
LT		 1365 if (ifp->flags&IFA_F_PERMANENT) {
1366 spin_lock_bh(&ifp->lock);
1367 addrconf_del_timer(ifp);
1368 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1369 if (dad_failed)
1370 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1371 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1372 if (dad_failed)
1373 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1374 in6_ifa_put(ifp);
1375#ifdef CONFIG_IPV6_PRIVACY
1376 } else if (ifp->flags&IFA_F_TEMPORARY) {
1377 struct inet6_ifaddr *ifpub;
1378 spin_lock_bh(&ifp->lock);
1379 ifpub = ifp->ifpub;
1380 if (ifpub) {
1381 in6_ifa_hold(ifpub);
1382 spin_unlock_bh(&ifp->lock);
1383 ipv6_create_tempaddr(ifpub, ifp);
1384 in6_ifa_put(ifpub);
1385 } else {
1386 spin_unlock_bh(&ifp->lock);
1387 }
1388 ipv6_del_addr(ifp);
1389#endif
1390 } else
1391 ipv6_del_addr(ifp);
1392}
1393
3c21edbd
YH		 1394void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1395{
1b34be74 1396 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1397
1398 if (net_ratelimit())
0522fea6
JR		 1399 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1400 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1401
1b34be74
YH		 1402 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1403 struct in6_addr addr;
1404
1405 addr.s6_addr32[0] = htonl(0xfe800000);
1406 addr.s6_addr32[1] = 0;
1407
1408 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1409 ipv6_addr_equal(&ifp->addr, &addr)) {
1410 /* DAD failed for link-local based on MAC address */
1411 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1412
1413 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1414 ifp->idev->dev->name);
1b34be74
YH		 1415 }
1416 }
1417
cc411d0b 1418 addrconf_dad_stop(ifp, 1);
3c21edbd 1419}
1da177e4
LT		 1420
1421/* Join to solicited addr multicast group. */
1422
1423void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1424{
1425 struct in6_addr maddr;
1426
1427 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1428 return;
1429
1430 addrconf_addr_solict_mult(addr, &maddr);
1431 ipv6_dev_mc_inc(dev, &maddr);
1432}
1433
1434void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1435{
1436 struct in6_addr maddr;
1437
1438 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1439 return;
1440
1441 addrconf_addr_solict_mult(addr, &maddr);
1442 __ipv6_dev_mc_dec(idev, &maddr);
1443}
1444
20380731 1445static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1446{
1447 struct in6_addr addr;
1448 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1449 if (ipv6_addr_any(&addr))
1450 return;
1451 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1452}
1453
20380731 1454static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1455{
1456 struct in6_addr addr;
1457 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1458 if (ipv6_addr_any(&addr))
1459 return;
1460 __ipv6_dev_ac_dec(ifp->idev, &addr);
1461}
1462
073a8e0e
YH		 1463static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1464{
1465 if (dev->addr_len != ETH_ALEN)
1466 return -1;
1467 memcpy(eui, dev->dev_addr, 3);
1468 memcpy(eui + 5, dev->dev_addr + 3, 3);
1469
1470 /*
1471 * The zSeries OSA network cards can be shared among various
1472 * OS instances, but the OSA cards have only one MAC address.
1473 * This leads to duplicate address conflicts in conjunction
1474 * with IPv6 if more than one instance uses the same card.
1475 *
1476 * The driver for these cards can deliver a unique 16-bit
1477 * identifier for each instance sharing the same card. It is
1478 * placed instead of 0xFFFE in the interface identifier. The
1479 * "u" bit of the interface identifier is not inverted in this
1480 * case. Hence the resulting interface identifier has local
1481 * scope according to RFC2373.
1482 */
1483 if (dev->dev_id) {
1484 eui[3] = (dev->dev_id >> 8) & 0xFF;
1485 eui[4] = dev->dev_id & 0xFF;
1486 } else {
1487 eui[3] = 0xFF;
1488 eui[4] = 0xFE;
1489 eui[0] ^= 2;
1490 }
1491 return 0;
1492}
1493
1494static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1495{
1496 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1497 if (dev->addr_len != ARCNET_ALEN)
1498 return -1;
1499 memset(eui, 0, 7);
1500 eui[7] = *(u8*)dev->dev_addr;
1501 return 0;
1502}
1503
1504static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1505{
1506 if (dev->addr_len != INFINIBAND_ALEN)
1507 return -1;
1508 memcpy(eui, dev->dev_addr + 12, 8);
1509 eui[0] |= 2;
1510 return 0;
1511}
1512
dfd982ba
YH		 1513int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1514{
9af28511
SH		 1515 if (addr == 0)
1516 return -1;
dfd982ba
YH		 1517 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1518 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1519 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1520 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1521 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1522 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1523 eui[1] = 0;
1524 eui[2] = 0x5E;
1525 eui[3] = 0xFE;
1526 memcpy(eui + 4, &addr, 4);
1527 return 0;
1528}
1529EXPORT_SYMBOL(__ipv6_isatap_ifid);
1530
1531static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1532{
1533 if (dev->priv_flags & IFF_ISATAP)
1534 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1535 return -1;
1536}
1537
1da177e4
LT		 1538static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1539{
1540 switch (dev->type) {
1541 case ARPHRD_ETHER:
1542 case ARPHRD_FDDI:
1543 case ARPHRD_IEEE802_TR:
073a8e0e 1544 return addrconf_ifid_eui48(eui, dev);
1da177e4 1545 case ARPHRD_ARCNET:
073a8e0e 1546 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1547 case ARPHRD_INFINIBAND:
073a8e0e 1548 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1549 case ARPHRD_SIT:
dfd982ba 1550 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1551 }
1552 return -1;
1553}
1554
1555static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1556{
1557 int err = -1;
1558 struct inet6_ifaddr *ifp;
1559
1560 read_lock_bh(&idev->lock);
1561 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1562 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1563 memcpy(eui, ifp->addr.s6_addr+8, 8);
1564 err = 0;
1565 break;
1566 }
1567 }
1568 read_unlock_bh(&idev->lock);
1569 return err;
1570}
1571
1572#ifdef CONFIG_IPV6_PRIVACY
1573/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1574static int __ipv6_regen_rndid(struct inet6_dev *idev)
1575{
1da177e4 1576regen:
955189ef 1577 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1578 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1579
1580 /*
1581 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1582 * check if generated address is not inappropriate
1583 *
1584 * - Reserved subnet anycast (RFC 2526)
1585 * 11111101 11....11 1xxxxxxx
c7dc89c0 1586 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1587 * 00-00-5E-FE-xx-xx-xx-xx
1588 * - value 0
1589 * - XXX: already assigned to an address on the device
1590 */
1ab1457c 1591 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1592 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1593 (idev->rndid[7]&0x80))
1594 goto regen;
1595 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1596 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1597 goto regen;
1598 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1599 goto regen;
1600 }
1601
1602 return 0;
1603}
1604
1605static void ipv6_regen_rndid(unsigned long data)
1606{
1607 struct inet6_dev *idev = (struct inet6_dev *) data;
1608 unsigned long expires;
1609
8814c4b5 1610 rcu_read_lock_bh();
1da177e4
LT		 1611 write_lock_bh(&idev->lock);
1612
1613 if (idev->dead)
1614 goto out;
1615
1616 if (__ipv6_regen_rndid(idev) < 0)
1617 goto out;
1ab1457c 1618
1da177e4 1619 expires = jiffies +
1ab1457c 1620 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1621 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1622 if (time_before(expires, jiffies)) {
1623 printk(KERN_WARNING
1624 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1625 idev->dev->name);
1626 goto out;
1627 }
1628
1629 if (!mod_timer(&idev->regen_timer, expires))
1630 in6_dev_hold(idev);
1631
1632out:
1633 write_unlock_bh(&idev->lock);
8814c4b5 1634 rcu_read_unlock_bh();
1da177e4
LT		 1635 in6_dev_put(idev);
1636}
1637
1638static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1639 int ret = 0;
1640
1641 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1642 ret = __ipv6_regen_rndid(idev);
1643 return ret;
1644}
1645#endif
1646
1647/*
1648 * Add prefix route.
1649 */
1650
1651static void
1652addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1653 unsigned long expires, u32 flags)
1da177e4 1654{
86872cb5
TG		 1655 struct fib6_config cfg = {
1656 .fc_table = RT6_TABLE_PREFIX,
1657 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1658 .fc_ifindex = dev->ifindex,
1659 .fc_expires = expires,
1660 .fc_dst_len = plen,
1661 .fc_flags = RTF_UP | flags,
c346dca1 1662 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1663 .fc_protocol = RTPROT_KERNEL,
86872cb5 1664 };
1da177e4 1665
86872cb5 1666 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1667
1668 /* Prevent useless cloning on PtP SIT.
1669 This thing is done here expecting that the whole
1670 class of non-broadcast devices need not cloning.
1671 */
0be669bb 1672#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1673 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1674 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1675#endif
1da177e4 1676
86872cb5 1677 ip6_route_add(&cfg);
1da177e4
LT		 1678}
1679
1680/* Create "default" multicast route to the interface */
1681
1682static void addrconf_add_mroute(struct net_device *dev)
1683{
86872cb5
TG		 1684 struct fib6_config cfg = {
1685 .fc_table = RT6_TABLE_LOCAL,
1686 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1687 .fc_ifindex = dev->ifindex,
1688 .fc_dst_len = 8,
1689 .fc_flags = RTF_UP,
c346dca1 1690 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1691 };
1692
1693 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1694
1695 ip6_route_add(&cfg);
1da177e4
LT		 1696}
1697
0be669bb 1698#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1699static void sit_route_add(struct net_device *dev)
1700{
86872cb5
TG		 1701 struct fib6_config cfg = {
1702 .fc_table = RT6_TABLE_MAIN,
1703 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1704 .fc_ifindex = dev->ifindex,
1705 .fc_dst_len = 96,
1706 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1707 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1708 };
1da177e4
LT		 1709
1710 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1711 ip6_route_add(&cfg);
1da177e4 1712}
0be669bb 1713#endif
1da177e4
LT		 1714
1715static void addrconf_add_lroute(struct net_device *dev)
1716{
1717 struct in6_addr addr;
1718
1719 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1720 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1721}
1722
1723static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1724{
1725 struct inet6_dev *idev;
1726
1727 ASSERT_RTNL();
1728
1729 if ((idev = ipv6_find_idev(dev)) == NULL)
1730 return NULL;
1731
1732 /* Add default multicast route */
1733 addrconf_add_mroute(dev);
1734
1735 /* Add link local route */
1736 addrconf_add_lroute(dev);
1737 return idev;
1738}
1739
1740void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1741{
1742 struct prefix_info *pinfo;
1743 __u32 valid_lft;
1744 __u32 prefered_lft;
1745 int addr_type;
1da177e4 1746 struct inet6_dev *in6_dev;
56d417b1 1747 struct net *net = dev_net(dev);
1da177e4
LT		 1748
1749 pinfo = (struct prefix_info *) opt;
1ab1457c 1750
1da177e4
LT		 1751 if (len < sizeof(struct prefix_info)) {
1752 ADBG(("addrconf: prefix option too short\n"));
1753 return;
1754 }
1ab1457c 1755
1da177e4
LT		 1756 /*
1757 * Validation checks ([ADDRCONF], page 19)
1758 */
1759
1760 addr_type = ipv6_addr_type(&pinfo->prefix);
1761
1762 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1763 return;
1764
1765 valid_lft = ntohl(pinfo->valid);
1766 prefered_lft = ntohl(pinfo->prefered);
1767
1768 if (prefered_lft > valid_lft) {
1769 if (net_ratelimit())
1770 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1771 return;
1772 }
1773
1774 in6_dev = in6_dev_get(dev);
1775
1776 if (in6_dev == NULL) {
1777 if (net_ratelimit())
1778 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1779 return;
1780 }
1781
1782 /*
1783 * Two things going on here:
1784 * 1) Add routes for on-link prefixes
1785 * 2) Configure prefixes with the auto flag set
1786 */
1787
4bed72e4
YH		 1788 if (pinfo->onlink) {
1789 struct rt6_info *rt;
1790 unsigned long rt_expires;
1791
6f704992
YH		 1792 /* Avoid arithmetic overflow. Really, we could
1793 * save rt_expires in seconds, likely valid_lft,
1794 * but it would require division in fib gc, that it
1795 * not good.
1796 */
4bed72e4
YH		 1797 if (HZ > USER_HZ)
1798 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1799 else
1800 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1801
4bed72e4
YH		 1802 if (addrconf_finite_timeout(rt_expires))
1803 rt_expires *= HZ;
1da177e4 1804
56d417b1 1805 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1806 dev->ifindex, 1);
1da177e4 1807
2b5ead46 1808 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1809 /* Autoconf prefix route */
1810 if (valid_lft == 0) {
1811 ip6_del_rt(rt);
1812 rt = NULL;
4bed72e4 1813 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1814 /* not infinity */
1815 rt->rt6i_expires = jiffies + rt_expires;
1816 rt->rt6i_flags |= RTF_EXPIRES;
1817 } else {
1818 rt->rt6i_flags &= ~RTF_EXPIRES;
1819 rt->rt6i_expires = 0;
1da177e4
LT		 1820 }
1821 } else if (valid_lft) {
6f704992 1822 clock_t expires = 0;
4bed72e4
YH		 1823 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1824 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1825 /* not infinity */
1826 flags |= RTF_EXPIRES;
1827 expires = jiffies_to_clock_t(rt_expires);
1828 }
1da177e4 1829 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1830 dev, expires, flags);
1da177e4
LT		 1831 }
1832 if (rt)
1833 dst_release(&rt->u.dst);
1834 }
1835
1836 /* Try to figure out our local address for this prefix */
1837
1838 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1839 struct inet6_ifaddr * ifp;
1840 struct in6_addr addr;
1841 int create = 0, update_lft = 0;
1842
1843 if (pinfo->prefix_len == 64) {
1844 memcpy(&addr, &pinfo->prefix, 8);
1845 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1846 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1847 in6_dev_put(in6_dev);
1848 return;
1849 }
1850 goto ok;
1851 }
1852 if (net_ratelimit())
1853 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1854 pinfo->prefix_len);
1855 in6_dev_put(in6_dev);
1856 return;
1857
1858ok:
1859
53b7997f 1860 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1861
1862 if (ifp == NULL && valid_lft) {
1863 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1864 u32 addr_flags = 0;
1865
1866#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1867 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1868 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1869 addr_flags = IFA_F_OPTIMISTIC;
1870#endif
1da177e4
LT		 1871
1872 /* Do not allow to create too much of autoconfigured
1873 * addresses; this would be too easy way to crash kernel.
1874 */
1875 if (!max_addresses ||
1876 ipv6_count_addresses(in6_dev) < max_addresses)
1877 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1878 addr_type&IPV6_ADDR_SCOPE_MASK,
1879 addr_flags);
1da177e4
LT		 1880
1881 if (!ifp || IS_ERR(ifp)) {
1882 in6_dev_put(in6_dev);
1883 return;
1884 }
1885
1886 update_lft = create = 1;
1887 ifp->cstamp = jiffies;
1888 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1889 }
1890
1891 if (ifp) {
1892 int flags;
1893 unsigned long now;
1894#ifdef CONFIG_IPV6_PRIVACY
1895 struct inet6_ifaddr *ift;
1896#endif
1897 u32 stored_lft;
1898
1899 /* update lifetime (RFC2462 5.5.3 e) */
1900 spin_lock(&ifp->lock);
1901 now = jiffies;
1902 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1903 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1904 else
1905 stored_lft = 0;
1906 if (!update_lft && stored_lft) {
1907 if (valid_lft > MIN_VALID_LIFETIME ||
1908 valid_lft > stored_lft)
1909 update_lft = 1;
1910 else if (stored_lft <= MIN_VALID_LIFETIME) {
1911 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1912 /*
1913 * RFC 4862 Section 5.5.3e:
1914 * "Note that the preferred lifetime of
1915 * the corresponding address is always
1916 * reset to the Preferred Lifetime in
1917 * the received Prefix Information
1918 * option, regardless of whether the
1919 * valid lifetime is also reset or
1920 * ignored."
1921 *
1922 * So if the preferred lifetime in
1923 * this advertisement is different
1924 * than what we have stored, but the
1925 * valid lifetime is invalid, just
1926 * reset prefered_lft.
1927 *
1928 * We must set the valid lifetime
1929 * to the stored lifetime since we'll
1930 * be updating the timestamp below,
1931 * else we'll set it back to the
1932 * minumum.
1933 */
1934 if (prefered_lft != ifp->prefered_lft) {
1935 valid_lft = stored_lft;
1936 update_lft = 1;
1937 }
1da177e4
LT		 1938 } else {
1939 valid_lft = MIN_VALID_LIFETIME;
1940 if (valid_lft < prefered_lft)
1941 prefered_lft = valid_lft;
1942 update_lft = 1;
1943 }
1944 }
1945
1946 if (update_lft) {
1947 ifp->valid_lft = valid_lft;
1948 ifp->prefered_lft = prefered_lft;
1949 ifp->tstamp = now;
1950 flags = ifp->flags;
1951 ifp->flags &= ~IFA_F_DEPRECATED;
1952 spin_unlock(&ifp->lock);
1953
1954 if (!(flags&IFA_F_TENTATIVE))
1955 ipv6_ifa_notify(0, ifp);
1956 } else
1957 spin_unlock(&ifp->lock);
1958
1959#ifdef CONFIG_IPV6_PRIVACY
1960 read_lock_bh(&in6_dev->lock);
1961 /* update all temporary addresses in the list */
372e6c8f 1962 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1963 /*
1964 * When adjusting the lifetimes of an existing
1965 * temporary address, only lower the lifetimes.
1966 * Implementations must not increase the
1967 * lifetimes of an existing temporary address
1968 * when processing a Prefix Information Option.
1969 */
c6fbfac2
BB		 1970 if (ifp != ift->ifpub)
1971 continue;
1972
1da177e4
LT		 1973 spin_lock(&ift->lock);
1974 flags = ift->flags;
1975 if (ift->valid_lft > valid_lft &&
1976 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1977 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1978 if (ift->prefered_lft > prefered_lft &&
1979 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1980 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1981 spin_unlock(&ift->lock);
1982 if (!(flags&IFA_F_TENTATIVE))
1983 ipv6_ifa_notify(0, ift);
1984 }
1985
1986 if (create && in6_dev->cnf.use_tempaddr > 0) {
1987 /*
1988 * When a new public address is created as described in [ADDRCONF],
1989 * also create a new temporary address.
1990 */
1ab1457c 1991 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1992 ipv6_create_tempaddr(ifp, NULL);
1993 } else {
1994 read_unlock_bh(&in6_dev->lock);
1995 }
1996#endif
1997 in6_ifa_put(ifp);
1998 addrconf_verify(0);
1999 }
2000 }
2001 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2002 in6_dev_put(in6_dev);
2003}
2004
2005/*
2006 * Set destination address.
2007 * Special case for SIT interfaces where we create a new "virtual"
2008 * device.
2009 */
af284937 2010int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2011{
2012 struct in6_ifreq ireq;
2013 struct net_device *dev;
2014 int err = -EINVAL;
2015
2016 rtnl_lock();
2017
2018 err = -EFAULT;
2019 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2020 goto err_exit;
2021
af284937 2022 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2023
2024 err = -ENODEV;
2025 if (dev == NULL)
2026 goto err_exit;
2027
0be669bb 2028#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2029 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2030 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2031 struct ifreq ifr;
1da177e4
LT		 2032 struct ip_tunnel_parm p;
2033
2034 err = -EADDRNOTAVAIL;
2035 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2036 goto err_exit;
2037
2038 memset(&p, 0, sizeof(p));
2039 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2040 p.iph.saddr = 0;
2041 p.iph.version = 4;
2042 p.iph.ihl = 5;
2043 p.iph.protocol = IPPROTO_IPV6;
2044 p.iph.ttl = 64;
d20b3109 2045 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2046
5bc3eb7e
SH		 2047 if (ops->ndo_do_ioctl) {
2048 mm_segment_t oldfs = get_fs();
2049
2050 set_fs(KERNEL_DS);
2051 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2052 set_fs(oldfs);
2053 } else
2054 err = -EOPNOTSUPP;
1da177e4
LT		 2055
2056 if (err == 0) {
2057 err = -ENOBUFS;
af284937
DL		 2058 dev = __dev_get_by_name(net, p.name);
2059 if (!dev)
1da177e4
LT		 2060 goto err_exit;
2061 err = dev_open(dev);
2062 }
2063 }
0be669bb 2064#endif
1da177e4
LT		 2065
2066err_exit:
2067 rtnl_unlock();
2068 return err;
2069}
2070
2071/*
2072 * Manual configuration of address on an interface
2073 */
af284937 2074static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2075 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2076 __u32 valid_lft)
1da177e4
LT		 2077{
2078 struct inet6_ifaddr *ifp;
2079 struct inet6_dev *idev;
2080 struct net_device *dev;
2081 int scope;
6f704992
YH		 2082 u32 flags;
2083 clock_t expires;
4bed72e4 2084 unsigned long timeout;
1da177e4
LT		 2085
2086 ASSERT_RTNL();
1ab1457c 2087
24ef0da7
TG		 2088 if (plen > 128)
2089 return -EINVAL;
2090
0778769d
NT		 2091 /* check the lifetime */
2092 if (!valid_lft || prefered_lft > valid_lft)
2093 return -EINVAL;
2094
af284937
DL		 2095 dev = __dev_get_by_index(net, ifindex);
2096 if (!dev)
1da177e4 2097 return -ENODEV;
1ab1457c 2098
1da177e4
LT		 2099 if ((idev = addrconf_add_dev(dev)) == NULL)
2100 return -ENOBUFS;
2101
2102 scope = ipv6_addr_scope(pfx);
2103
4bed72e4
YH		 2104 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2105 if (addrconf_finite_timeout(timeout)) {
2106 expires = jiffies_to_clock_t(timeout * HZ);
2107 valid_lft = timeout;
6f704992 2108 flags = RTF_EXPIRES;
4bed72e4
YH		 2109 } else {
2110 expires = 0;
2111 flags = 0;
2112 ifa_flags |= IFA_F_PERMANENT;
6f704992 2113 }
0778769d 2114
4bed72e4
YH		 2115 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2116 if (addrconf_finite_timeout(timeout)) {
2117 if (timeout == 0)
2118 ifa_flags |= IFA_F_DEPRECATED;
2119 prefered_lft = timeout;
2120 }
0778769d
NT		 2121
2122 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2123
1da177e4 2124 if (!IS_ERR(ifp)) {
06aebfb7 2125 spin_lock_bh(&ifp->lock);
0778769d
NT		 2126 ifp->valid_lft = valid_lft;
2127 ifp->prefered_lft = prefered_lft;
2128 ifp->tstamp = jiffies;
06aebfb7 2129 spin_unlock_bh(&ifp->lock);
0778769d 2130
46d48046 2131 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2132 expires, flags);
95c385b4
NH		 2133 /*
2134 * Note that section 3.1 of RFC 4429 indicates
2135 * that the Optimistic flag should not be set for
2136 * manually configured addresses
2137 */
1da177e4
LT		 2138 addrconf_dad_start(ifp, 0);
2139 in6_ifa_put(ifp);
0778769d 2140 addrconf_verify(0);
1da177e4
LT		 2141 return 0;
2142 }
2143
2144 return PTR_ERR(ifp);
2145}
2146
af284937 2147static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2148 unsigned int plen)
1da177e4
LT		 2149{
2150 struct inet6_ifaddr *ifp;
2151 struct inet6_dev *idev;
2152 struct net_device *dev;
1ab1457c 2153
24ef0da7
TG		 2154 if (plen > 128)
2155 return -EINVAL;
2156
af284937
DL		 2157 dev = __dev_get_by_index(net, ifindex);
2158 if (!dev)
1da177e4
LT		 2159 return -ENODEV;
2160
2161 if ((idev = __in6_dev_get(dev)) == NULL)
2162 return -ENXIO;
2163
2164 read_lock_bh(&idev->lock);
2165 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2166 if (ifp->prefix_len == plen &&
2167 ipv6_addr_equal(pfx, &ifp->addr)) {
2168 in6_ifa_hold(ifp);
2169 read_unlock_bh(&idev->lock);
1ab1457c 2170
1da177e4
LT		 2171 ipv6_del_addr(ifp);
2172
2173 /* If the last address is deleted administratively,
2174 disable IPv6 on this interface.
2175 */
2176 if (idev->addr_list == NULL)
2177 addrconf_ifdown(idev->dev, 1);
2178 return 0;
2179 }
2180 }
2181 read_unlock_bh(&idev->lock);
2182 return -EADDRNOTAVAIL;
2183}
2184
2185
af284937 2186int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2187{
2188 struct in6_ifreq ireq;
2189 int err;
1ab1457c 2190
1da177e4
LT		 2191 if (!capable(CAP_NET_ADMIN))
2192 return -EPERM;
1ab1457c 2193
1da177e4
LT		 2194 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2195 return -EFAULT;
2196
2197 rtnl_lock();
af284937
DL		 2198 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2199 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2200 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2201 rtnl_unlock();
2202 return err;
2203}
2204
af284937 2205int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2206{
2207 struct in6_ifreq ireq;
2208 int err;
1ab1457c 2209
1da177e4
LT		 2210 if (!capable(CAP_NET_ADMIN))
2211 return -EPERM;
2212
2213 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2214 return -EFAULT;
2215
2216 rtnl_lock();
af284937
DL		 2217 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2218 ireq.ifr6_prefixlen);
1da177e4
LT		 2219 rtnl_unlock();
2220 return err;
2221}
2222
b5f348e5
IJ		 2223static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2224 int plen, int scope)
2225{
2226 struct inet6_ifaddr *ifp;
2227
2228 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2229 if (!IS_ERR(ifp)) {
2230 spin_lock_bh(&ifp->lock);
2231 ifp->flags &= ~IFA_F_TENTATIVE;
2232 spin_unlock_bh(&ifp->lock);
2233 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2234 in6_ifa_put(ifp);
2235 }
2236}
2237
0be669bb 2238#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2239static void sit_add_v4_addrs(struct inet6_dev *idev)
2240{
1da177e4
LT		 2241 struct in6_addr addr;
2242 struct net_device *dev;
c346dca1 2243 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2244 int scope;
2245
2246 ASSERT_RTNL();
2247
2248 memset(&addr, 0, sizeof(struct in6_addr));
2249 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2250
2251 if (idev->dev->flags&IFF_POINTOPOINT) {
2252 addr.s6_addr32[0] = htonl(0xfe800000);
2253 scope = IFA_LINK;
2254 } else {
2255 scope = IPV6_ADDR_COMPATv4;
2256 }
2257
2258 if (addr.s6_addr32[3]) {
b5f348e5 2259 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2260 return;
2261 }
2262
6fda7350 2263 for_each_netdev(net, dev) {
e5ed6399 2264 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2265 if (in_dev && (dev->flags & IFF_UP)) {
2266 struct in_ifaddr * ifa;
2267
2268 int flag = scope;
2269
2270 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2271 int plen;
2272
2273 addr.s6_addr32[3] = ifa->ifa_local;
2274
2275 if (ifa->ifa_scope == RT_SCOPE_LINK)
2276 continue;
2277 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2278 if (idev->dev->flags&IFF_POINTOPOINT)
2279 continue;
2280 flag |= IFA_HOST;
2281 }
2282 if (idev->dev->flags&IFF_POINTOPOINT)
2283 plen = 64;
2284 else
2285 plen = 96;
2286
b5f348e5 2287 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2288 }
2289 }
1ab1457c 2290 }
1da177e4 2291}
0be669bb 2292#endif
1da177e4
LT		 2293
2294static void init_loopback(struct net_device *dev)
2295{
2296 struct inet6_dev *idev;
1da177e4
LT		 2297
2298 /* ::1 */
2299
2300 ASSERT_RTNL();
2301
2302 if ((idev = ipv6_find_idev(dev)) == NULL) {
2303 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2304 return;
2305 }
2306
b5f348e5 2307 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2308}
2309
2310static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2311{
2312 struct inet6_ifaddr * ifp;
95c385b4
NH		 2313 u32 addr_flags = IFA_F_PERMANENT;
2314
2315#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2316 if (idev->cnf.optimistic_dad &&
702beb87 2317 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2318 addr_flags |= IFA_F_OPTIMISTIC;
2319#endif
1da177e4 2320
95c385b4
NH		 2321
2322 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2323 if (!IS_ERR(ifp)) {
46d48046 2324 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2325 addrconf_dad_start(ifp, 0);
2326 in6_ifa_put(ifp);
2327 }
2328}
2329
2330static void addrconf_dev_config(struct net_device *dev)
2331{
2332 struct in6_addr addr;
2333 struct inet6_dev * idev;
2334
2335 ASSERT_RTNL();
2336
74235a25
HX		 2337 if ((dev->type != ARPHRD_ETHER) &&
2338 (dev->type != ARPHRD_FDDI) &&
2339 (dev->type != ARPHRD_IEEE802_TR) &&
2340 (dev->type != ARPHRD_ARCNET) &&
2341 (dev->type != ARPHRD_INFINIBAND)) {
2342 /* Alas, we support only Ethernet autoconfiguration. */
2343 return;
2344 }
2345
1da177e4
LT		 2346 idev = addrconf_add_dev(dev);
2347 if (idev == NULL)
2348 return;
2349
2350 memset(&addr, 0, sizeof(struct in6_addr));
2351 addr.s6_addr32[0] = htonl(0xFE800000);
2352
2353 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2354 addrconf_add_linklocal(idev, &addr);
2355}
2356
0be669bb 2357#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2358static void addrconf_sit_config(struct net_device *dev)
2359{
2360 struct inet6_dev *idev;
2361
2362 ASSERT_RTNL();
2363
1ab1457c
YH		 2364 /*
2365 * Configure the tunnel with one of our IPv4
2366 * addresses... we should configure all of
1da177e4
LT		 2367 * our v4 addrs in the tunnel
2368 */
2369
2370 if ((idev = ipv6_find_idev(dev)) == NULL) {
2371 printk(KERN_DEBUG "init sit: add_dev failed\n");
2372 return;
2373 }
2374
c7dc89c0
FT		 2375 if (dev->priv_flags & IFF_ISATAP) {
2376 struct in6_addr addr;
2377
2378 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2379 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2380 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2381 addrconf_add_linklocal(idev, &addr);
2382 return;
2383 }
2384
1da177e4
LT		 2385 sit_add_v4_addrs(idev);
2386
2387 if (dev->flags&IFF_POINTOPOINT) {
2388 addrconf_add_mroute(dev);
2389 addrconf_add_lroute(dev);
2390 } else
2391 sit_route_add(dev);
2392}
0be669bb 2393#endif
1da177e4
LT		 2394
2395static inline int
2396ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2397{
2398 struct in6_addr lladdr;
2399
95c385b4 2400 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2401 addrconf_add_linklocal(idev, &lladdr);
2402 return 0;
2403 }
2404 return -1;
2405}
2406
2407static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2408{
2409 struct net_device *link_dev;
c346dca1 2410 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2411
2412 /* first try to inherit the link-local address from the link device */
2413 if (idev->dev->iflink &&
6fda7350 2414 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2415 if (!ipv6_inherit_linklocal(idev, link_dev))
2416 return;
2417 }
2418 /* then try to inherit it from any device */
6fda7350 2419 for_each_netdev(net, link_dev) {
1da177e4
LT		 2420 if (!ipv6_inherit_linklocal(idev, link_dev))
2421 return;
2422 }
2423 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2424}
2425
2426/*
2427 * Autoconfigure tunnel with a link-local address so routing protocols,
2428 * DHCPv6, MLD etc. can be run over the virtual link
2429 */
2430
2431static void addrconf_ip6_tnl_config(struct net_device *dev)
2432{
2433 struct inet6_dev *idev;
2434
2435 ASSERT_RTNL();
2436
2437 if ((idev = addrconf_add_dev(dev)) == NULL) {
2438 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2439 return;
2440 }
2441 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2442}
2443
1ab1457c 2444static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2445 void * data)
2446{
2447 struct net_device *dev = (struct net_device *) data;
74235a25 2448 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2449 int run_pending = 0;
b217d616 2450 int err;
1da177e4
LT		 2451
2452 switch(event) {
45ba9dd2 2453 case NETDEV_REGISTER:
74235a25 2454 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2455 idev = ipv6_add_dev(dev);
2456 if (!idev)
b217d616 2457 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2458 }
2459 break;
1da177e4 2460 case NETDEV_UP:
3c21edbd 2461 case NETDEV_CHANGE:
c2edacf8
JV		 2462 if (dev->flags & IFF_SLAVE)
2463 break;
2464
3c21edbd 2465 if (event == NETDEV_UP) {
f24e3d65 2466 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2467 /* device is not ready yet. */
2468 printk(KERN_INFO
2469 "ADDRCONF(NETDEV_UP): %s: "
2470 "link is not ready\n",
2471 dev->name);
2472 break;
2473 }
99081049 2474
d31c7b8f
EP		 2475 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2476 idev = ipv6_add_dev(dev);
2477
e3ec6cfc 2478 if (idev) {
99081049 2479 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2480 run_pending = 1;
2481 }
3c21edbd 2482 } else {
f24e3d65 2483 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2484 /* device is still not ready. */
2485 break;
2486 }
2487
2488 if (idev) {
2489 if (idev->if_flags & IF_READY) {
2490 /* device is already configured. */
2491 break;
2492 }
2493 idev->if_flags |= IF_READY;
2494 }
2495
2496 printk(KERN_INFO
2497 "ADDRCONF(NETDEV_CHANGE): %s: "
2498 "link becomes ready\n",
2499 dev->name);
2500
c5e33bdd 2501 run_pending = 1;
3c21edbd
YH		 2502 }
2503
1da177e4 2504 switch(dev->type) {
0be669bb 2505#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2506 case ARPHRD_SIT:
2507 addrconf_sit_config(dev);
2508 break;
0be669bb 2509#endif
1da177e4
LT		 2510 case ARPHRD_TUNNEL6:
2511 addrconf_ip6_tnl_config(dev);
2512 break;
2513 case ARPHRD_LOOPBACK:
2514 init_loopback(dev);
2515 break;
2516
2517 default:
2518 addrconf_dev_config(dev);
2519 break;
3ff50b79 2520 }
1da177e4 2521 if (idev) {
c5e33bdd
YH		 2522 if (run_pending)
2523 addrconf_dad_run(idev);
2524
1da177e4
LT		 2525 /* If the MTU changed during the interface down, when the
2526 interface up, the changed MTU must be reflected in the
2527 idev as well as routers.
2528 */
2529 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2530 rt6_mtu_change(dev, dev->mtu);
2531 idev->cnf.mtu6 = dev->mtu;
2532 }
2533 idev->tstamp = jiffies;
2534 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2535 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2536 stop IPv6 on this interface.
2537 */
2538 if (dev->mtu < IPV6_MIN_MTU)
2539 addrconf_ifdown(dev, event != NETDEV_DOWN);
2540 }
2541 break;
2542
2543 case NETDEV_CHANGEMTU:
d31c7b8f 2544 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2545 rt6_mtu_change(dev, dev->mtu);
2546 idev->cnf.mtu6 = dev->mtu;
2547 break;
2548 }
2549
d31c7b8f
EP		 2550 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2551 idev = ipv6_add_dev(dev);
2552 if (idev)
2553 break;
2554 }
2555
1da177e4
LT		 2556 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2557
2558 case NETDEV_DOWN:
2559 case NETDEV_UNREGISTER:
2560 /*
2561 * Remove all addresses from this interface.
2562 */
2563 addrconf_ifdown(dev, event != NETDEV_DOWN);
2564 break;
3c21edbd 2565
1da177e4 2566 case NETDEV_CHANGENAME:
1da177e4 2567 if (idev) {
5632c515 2568 snmp6_unregister_dev(idev);
408c4768 2569 addrconf_sysctl_unregister(idev);
f52295a9 2570 addrconf_sysctl_register(idev);
b217d616
HX		 2571 err = snmp6_register_dev(idev);
2572 if (err)
2573 return notifier_from_errno(err);
5632c515 2574 }
1da177e4 2575 break;
93d9b7d7
JP		 2576 case NETDEV_PRE_TYPE_CHANGE:
2577 case NETDEV_POST_TYPE_CHANGE:
2578 addrconf_type_change(dev, event);
75c78500 2579 break;
3ff50b79 2580 }
1da177e4
LT		 2581
2582 return NOTIFY_OK;
2583}
2584
2585/*
2586 * addrconf module should be notified of a device going up
2587 */
2588static struct notifier_block ipv6_dev_notf = {
2589 .notifier_call = addrconf_notify,
2590 .priority = 0
2591};
2592
93d9b7d7 2593static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2594{
2595 struct inet6_dev *idev;
2596 ASSERT_RTNL();
2597
2598 idev = __in6_dev_get(dev);
2599
93d9b7d7 2600 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2601 ipv6_mc_remap(idev);
93d9b7d7 2602 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2603 ipv6_mc_unmap(idev);
2604}
2605
1da177e4
LT		 2606static int addrconf_ifdown(struct net_device *dev, int how)
2607{
2608 struct inet6_dev *idev;
8f37ada5 2609 struct inet6_ifaddr *ifa, *keep_list, **bifa;
c346dca1 2610 struct net *net = dev_net(dev);
1da177e4
LT		 2611
2612 ASSERT_RTNL();
2613
f3db4851 2614 rt6_ifdown(net, dev);
1da177e4
LT		 2615 neigh_ifdown(&nd_tbl, dev);
2616
2617 idev = __in6_dev_get(dev);
2618 if (idev == NULL)
2619 return -ENODEV;
2620
2621 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2622 Do not dev_put!
1da177e4 2623 */
439e2385 2624 if (how) {
1da177e4 2625 idev->dead = 1;
8814c4b5
YH		 2626
2627 /* protected by rtnl_lock */
2628 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2629
2630 /* Step 1.5: remove snmp6 entry */
2631 snmp6_unregister_dev(idev);
2632
2633 }
2634
1da177e4
LT		 2635 write_lock_bh(&idev->lock);
2636
2637 /* Step 3: clear flags for stateless addrconf */
439e2385 2638 if (!how)
3c21edbd 2639 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2640
2641 /* Step 4: clear address list */
2642#ifdef CONFIG_IPV6_PRIVACY
439e2385 2643 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2644 in6_dev_put(idev);
2645
2646 /* clear tempaddr list */
372e6c8f 2647 while (!list_empty(&idev->tempaddr_list)) {
2648 ifa = list_first_entry(&idev->tempaddr_list,
2649 struct inet6_ifaddr, tmp_list);
2650 list_del(&ifa->tmp_list);
1da177e4
LT		 2651 ifa->dead = 1;
2652 write_unlock_bh(&idev->lock);
2653 spin_lock_bh(&ifa->lock);
2654
2655 if (ifa->ifpub) {
2656 in6_ifa_put(ifa->ifpub);
2657 ifa->ifpub = NULL;
2658 }
2659 spin_unlock_bh(&ifa->lock);
2660 in6_ifa_put(ifa);
2661 write_lock_bh(&idev->lock);
2662 }
2663#endif
8f37ada5 2664 keep_list = NULL;
2665 bifa = &keep_list;
2666 while ((ifa = idev->addr_list) != NULL) {
2667 idev->addr_list = ifa->if_next;
2668 ifa->if_next = NULL;
2669
84e8b803 2670 addrconf_del_timer(ifa);
2671
2672 /* If just doing link down, and address is permanent
2673 and not link-local, then retain it. */
2674 if (how == 0 &&
2675 (ifa->flags&IFA_F_PERMANENT) &&
2676 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
8f37ada5 2677
2678 /* Move to holding list */
2679 *bifa = ifa;
dc2b99f7 2680 bifa = &ifa->if_next;
2681
84e8b803 2682 /* If not doing DAD on this address, just keep it. */
2683 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2684 idev->cnf.accept_dad <= 0 ||
2685 (ifa->flags & IFA_F_NODAD))
2686 continue;
2687
2688 /* If it was tentative already, no need to notify */
2689 if (ifa->flags & IFA_F_TENTATIVE)
2690 continue;
2691
2692 /* Flag it for later restoration when link comes up */
2693 ifa->flags |= IFA_F_TENTATIVE;
2694 in6_ifa_hold(ifa);
dc2b99f7 2695 } else {
dc2b99f7 2696 ifa->dead = 1;
84e8b803 2697 }
2698 write_unlock_bh(&idev->lock);
1da177e4 2699
c2e21293 2700 /* clear hash table */
2701 write_lock_bh(&addrconf_hash_lock);
2702 hlist_del_init(&ifa->addr_lst);
2703 __in6_ifa_put(ifa);
2704 write_unlock_bh(&addrconf_hash_lock);
2705
84e8b803 2706 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2707 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2708 in6_ifa_put(ifa);
dc2b99f7 2709
84e8b803 2710 write_lock_bh(&idev->lock);
1da177e4 2711 }
8f37ada5 2712
2713 idev->addr_list = keep_list;
2714
1da177e4
LT		 2715 write_unlock_bh(&idev->lock);
2716
2717 /* Step 5: Discard multicast list */
2718
439e2385 2719 if (how)
1da177e4
LT		 2720 ipv6_mc_destroy_dev(idev);
2721 else
2722 ipv6_mc_down(idev);
2723
1da177e4 2724 idev->tstamp = jiffies;
1ab1457c 2725
1da177e4
LT		 2726 /* Shot the device (if unregistered) */
2727
439e2385 2728 if (how) {
408c4768 2729 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2730 neigh_parms_release(&nd_tbl, idev->nd_parms);
2731 neigh_ifdown(&nd_tbl, dev);
2732 in6_dev_put(idev);
2733 }
2734 return 0;
2735}
2736
2737static void addrconf_rs_timer(unsigned long data)
2738{
2739 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2740 struct inet6_dev *idev = ifp->idev;
1da177e4 2741
5b2a1953 2742 read_lock(&idev->lock);
2743 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2744 goto out;
2745
5b2a1953 2746 if (idev->cnf.forwarding)
2747 goto out;
2748
2749 /* Announcement received after solicitation was sent */
2750 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2751 goto out;
1da177e4
LT		 2752
2753 spin_lock(&ifp->lock);
5b2a1953 2754 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2755 /* The wait after the last probe can be shorter */
2756 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2757 (ifp->probes == idev->cnf.rtr_solicits) ?
2758 idev->cnf.rtr_solicit_delay :
2759 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2760 spin_unlock(&ifp->lock);
2761
5b2a1953 2762 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2763 } else {
2764 spin_unlock(&ifp->lock);
2765 /*
2766 * Note: we do not support deprecated "all on-link"
2767 * assumption any longer.
2768 */
2769 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2770 idev->dev->name);
1da177e4
LT		 2771 }
2772
2773out:
5b2a1953 2774 read_unlock(&idev->lock);
1da177e4
LT		 2775 in6_ifa_put(ifp);
2776}
2777
2778/*
2779 * Duplicate Address Detection
2780 */
3c21edbd
YH		 2781static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2782{
2783 unsigned long rand_num;
2784 struct inet6_dev *idev = ifp->idev;
2785
95c385b4
NH		 2786 if (ifp->flags & IFA_F_OPTIMISTIC)
2787 rand_num = 0;
2788 else
2789 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2790
3c21edbd
YH		 2791 ifp->probes = idev->cnf.dad_transmits;
2792 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2793}
2794
e431b8c0 2795static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2796{
2797 struct inet6_dev *idev = ifp->idev;
2798 struct net_device *dev = idev->dev;
1da177e4
LT		 2799
2800 addrconf_join_solict(dev, &ifp->addr);
2801
1da177e4 2802 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2803
2804 read_lock_bh(&idev->lock);
2805 if (ifp->dead)
2806 goto out;
1da177e4 2807
21809faf 2808 spin_lock(&ifp->lock);
1da177e4 2809 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2810 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2811 !(ifp->flags&IFA_F_TENTATIVE) ||
2812 ifp->flags & IFA_F_NODAD) {
cc411d0b 2813 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2814 spin_unlock(&ifp->lock);
1da177e4
LT		 2815 read_unlock_bh(&idev->lock);
2816
2817 addrconf_dad_completed(ifp);
2818 return;
2819 }
2820
6732bade 2821 if (!(idev->if_flags & IF_READY)) {
21809faf 2822 spin_unlock(&ifp->lock);
6732bade 2823 read_unlock_bh(&idev->lock);
3c21edbd 2824 /*
590a9887 2825 * If the device is not ready:
3c21edbd
YH		 2826 * - keep it tentative if it is a permanent address.
2827 * - otherwise, kill it.
2828 */
2829 in6_ifa_hold(ifp);
cc411d0b 2830 addrconf_dad_stop(ifp, 0);
6732bade 2831 return;
3c21edbd 2832 }
95c385b4
NH		 2833
2834 /*
2835 * Optimistic nodes can start receiving
2836 * Frames right away
2837 */
2838 if(ifp->flags & IFA_F_OPTIMISTIC)
2839 ip6_ins_rt(ifp->rt);
2840
6732bade 2841 addrconf_dad_kick(ifp);
21809faf 2842 spin_unlock(&ifp->lock);
1da177e4
LT		 2843out:
2844 read_unlock_bh(&idev->lock);
2845}
2846
2847static void addrconf_dad_timer(unsigned long data)
2848{
2849 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2850 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2851 struct in6_addr mcaddr;
2852
122e4519 2853 read_lock(&idev->lock);
2854 if (idev->dead || !(idev->if_flags & IF_READY)) {
2855 read_unlock(&idev->lock);
1da177e4
LT		 2856 goto out;
2857 }
21809faf 2858
2859 spin_lock(&ifp->lock);
1da177e4
LT		 2860 if (ifp->probes == 0) {
2861 /*
2862 * DAD was successful
2863 */
2864
cc411d0b 2865 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2866 spin_unlock(&ifp->lock);
122e4519 2867 read_unlock(&idev->lock);
1da177e4
LT		 2868
2869 addrconf_dad_completed(ifp);
2870
2871 goto out;
2872 }
2873
2874 ifp->probes--;
2875 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2876 spin_unlock(&ifp->lock);
122e4519 2877 read_unlock(&idev->lock);
1da177e4
LT		 2878
2879 /* send a neighbour solicitation for our addr */
1da177e4 2880 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2881 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2882out:
2883 in6_ifa_put(ifp);
2884}
2885
2886static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2887{
2888 struct net_device * dev = ifp->idev->dev;
2889
2890 /*
2891 * Configure the address for reception. Now it is valid.
2892 */
2893
2894 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2895
2896 /* If added prefix is link local and forwarding is off,
2897 start sending router solicitations.
2898 */
2899
2900 if (ifp->idev->cnf.forwarding == 0 &&
2901 ifp->idev->cnf.rtr_solicits > 0 &&
2902 (dev->flags&IFF_LOOPBACK) == 0 &&
2903 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2904 /*
2905 * If a host as already performed a random delay
2906 * [...] as part of DAD [...] there is no need
2907 * to delay again before sending the first RS
2908 */
f3ee4010 2909 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2910
2911 spin_lock_bh(&ifp->lock);
2912 ifp->probes = 1;
2913 ifp->idev->if_flags |= IF_RS_SENT;
2914 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2915 spin_unlock_bh(&ifp->lock);
2916 }
2917}
2918
c5e33bdd
YH		 2919static void addrconf_dad_run(struct inet6_dev *idev) {
2920 struct inet6_ifaddr *ifp;
2921
2922 read_lock_bh(&idev->lock);
2923 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
21809faf 2924 spin_lock(&ifp->lock);
c5e33bdd 2925 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2926 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2927 continue;
2928 }
21809faf 2929 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2930 addrconf_dad_kick(ifp);
2931 }
2932 read_unlock_bh(&idev->lock);
2933}
2934
1da177e4
LT		 2935#ifdef CONFIG_PROC_FS
2936struct if6_iter_state {
3c40090a 2937 struct seq_net_private p;
1da177e4
LT		 2938 int bucket;
2939};
2940
2941static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2942{
2943 struct inet6_ifaddr *ifa = NULL;
2944 struct if6_iter_state *state = seq->private;
1218854a 2945 struct net *net = seq_file_net(seq);
1da177e4
LT		 2946
2947 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 2948 struct hlist_node *n;
2949 hlist_for_each_entry(ifa, n,
2950 &inet6_addr_lst[state->bucket], addr_lst) {
2951 if (net_eq(dev_net(ifa->idev->dev), net))
2952 return ifa;
2953 }
1da177e4 2954 }
c2e21293 2955 return NULL;
1da177e4
LT		 2956}
2957
c2e21293 2958static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2959 struct inet6_ifaddr *ifa)
1da177e4
LT		 2960{
2961 struct if6_iter_state *state = seq->private;
1218854a 2962 struct net *net = seq_file_net(seq);
c2e21293 2963 struct hlist_node *n = &ifa->addr_lst;
1da177e4 2964
c2e21293 2965 hlist_for_each_entry_continue(ifa, n, addr_lst) {
2966 if (net_eq(dev_net(ifa->idev->dev), net))
2967 return ifa;
3c40090a
DL		 2968 }
2969
c2e21293 2970 while (++state->bucket < IN6_ADDR_HSIZE) {
2971 hlist_for_each_entry(ifa, n,
2972 &inet6_addr_lst[state->bucket], addr_lst) {
2973 if (net_eq(dev_net(ifa->idev->dev), net))
2974 return ifa;
2975 }
1da177e4 2976 }
3c40090a 2977
c2e21293 2978 return NULL;
1da177e4
LT		 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;
c2e21293 3080 struct inet6_ifaddr *ifp = NULL;
3081 struct hlist_node *n;
3b9f9a1c 3082 u8 hash = ipv6_addr_hash(addr);
c2e21293 3083
3b9f9a1c 3084 read_lock_bh(&addrconf_hash_lock);
c2e21293 3085 hlist_for_each_entry(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3086 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3087 continue;
caad295f 3088 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3089 (ifp->flags & IFA_F_HOMEADDRESS)) {
3090 ret = 1;
3091 break;
3092 }
3093 }
3094 read_unlock_bh(&addrconf_hash_lock);
3095 return ret;
3096}
3097#endif
3098
1da177e4
LT		 3099/*
3100 * Periodic address status verification
3101 */
3102
3103static void addrconf_verify(unsigned long foo)
3104{
3105 struct inet6_ifaddr *ifp;
c2e21293 3106 struct hlist_node *node;
1da177e4
LT		 3107 unsigned long now, next;
3108 int i;
3109
3110 spin_lock_bh(&addrconf_verify_lock);
3111 now = jiffies;
3112 next = now + ADDR_CHECK_FREQUENCY;
3113
3114 del_timer(&addr_chk_timer);
3115
3116 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3117
3118restart:
5d5780df 3119 read_lock(&addrconf_hash_lock);
c2e21293 3120 hlist_for_each_entry(ifp, node, &inet6_addr_lst[i], addr_lst) {
1da177e4
LT		 3121 unsigned long age;
3122#ifdef CONFIG_IPV6_PRIVACY
3123 unsigned long regen_advance;
3124#endif
3125
3126 if (ifp->flags & IFA_F_PERMANENT)
3127 continue;
3128
3129 spin_lock(&ifp->lock);
3130 age = (now - ifp->tstamp) / HZ;
3131
3132#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3133 regen_advance = ifp->idev->cnf.regen_max_retry *
3134 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3135 ifp->idev->nd_parms->retrans_time / HZ;
3136#endif
3137
8f27ebb9
YH		 3138 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3139 age >= ifp->valid_lft) {
1da177e4
LT		 3140 spin_unlock(&ifp->lock);
3141 in6_ifa_hold(ifp);
5d5780df 3142 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3143 ipv6_del_addr(ifp);
3144 goto restart;
8f27ebb9
YH		 3145 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3146 spin_unlock(&ifp->lock);
3147 continue;
1da177e4 3148 } else if (age >= ifp->prefered_lft) {
a1ed0526 3149 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3150 int deprecate = 0;
3151
3152 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3153 deprecate = 1;
3154 ifp->flags |= IFA_F_DEPRECATED;
3155 }
3156
3157 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3158 next = ifp->tstamp + ifp->valid_lft * HZ;
3159
3160 spin_unlock(&ifp->lock);
3161
3162 if (deprecate) {
3163 in6_ifa_hold(ifp);
5d5780df 3164 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3165
3166 ipv6_ifa_notify(0, ifp);
3167 in6_ifa_put(ifp);
3168 goto restart;
3169 }
3170#ifdef CONFIG_IPV6_PRIVACY
3171 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3172 !(ifp->flags&IFA_F_TENTATIVE)) {
3173 if (age >= ifp->prefered_lft - regen_advance) {
3174 struct inet6_ifaddr *ifpub = ifp->ifpub;
3175 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3176 next = ifp->tstamp + ifp->prefered_lft * HZ;
3177 if (!ifp->regen_count && ifpub) {
3178 ifp->regen_count++;
3179 in6_ifa_hold(ifp);
3180 in6_ifa_hold(ifpub);
3181 spin_unlock(&ifp->lock);
5d5780df 3182 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3183 spin_lock(&ifpub->lock);
3184 ifpub->regen_count = 0;
3185 spin_unlock(&ifpub->lock);
1da177e4
LT		 3186 ipv6_create_tempaddr(ifpub, ifp);
3187 in6_ifa_put(ifpub);
3188 in6_ifa_put(ifp);
3189 goto restart;
3190 }
3191 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3192 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3193 spin_unlock(&ifp->lock);
3194#endif
3195 } else {
3196 /* ifp->prefered_lft <= ifp->valid_lft */
3197 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3198 next = ifp->tstamp + ifp->prefered_lft * HZ;
3199 spin_unlock(&ifp->lock);
3200 }
3201 }
5d5780df 3202 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3203 }
3204
3205 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3206 add_timer(&addr_chk_timer);
3207 spin_unlock_bh(&addrconf_verify_lock);
3208}
3209
461d8837
TG		 3210static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3211{
3212 struct in6_addr *pfx = NULL;
3213
3214 if (addr)
3215 pfx = nla_data(addr);
3216
3217 if (local) {
3218 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3219 pfx = NULL;
3220 else
3221 pfx = nla_data(local);
3222 }
3223
3224 return pfx;
3225}
3226
ef7c79ed 3227static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3228 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3229 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3230 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3231};
3232
1da177e4
LT		 3233static int
3234inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3235{
3b1e0a65 3236 struct net *net = sock_net(skb->sk);
b933f716
TG		 3237 struct ifaddrmsg *ifm;
3238 struct nlattr *tb[IFA_MAX+1];
1da177e4 3239 struct in6_addr *pfx;
b933f716 3240 int err;
1da177e4 3241
b933f716
TG		 3242 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3243 if (err < 0)
3244 return err;
3245
3246 ifm = nlmsg_data(nlh);
3247 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3248 if (pfx == NULL)
3249 return -EINVAL;
3250
af284937 3251 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3252}
3253
55ebaef1
NT		 3254static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3255 u32 prefered_lft, u32 valid_lft)
081bba5b 3256{
6f704992
YH		 3257 u32 flags;
3258 clock_t expires;
4bed72e4 3259 unsigned long timeout;
46d48046 3260
081bba5b
NT		 3261 if (!valid_lft || (prefered_lft > valid_lft))
3262 return -EINVAL;
3263
4bed72e4
YH		 3264 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3265 if (addrconf_finite_timeout(timeout)) {
3266 expires = jiffies_to_clock_t(timeout * HZ);
3267 valid_lft = timeout;
6f704992 3268 flags = RTF_EXPIRES;
4bed72e4
YH		 3269 } else {
3270 expires = 0;
3271 flags = 0;
3272 ifa_flags |= IFA_F_PERMANENT;
6f704992 3273 }
081bba5b 3274
4bed72e4
YH		 3275 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3276 if (addrconf_finite_timeout(timeout)) {
3277 if (timeout == 0)
3278 ifa_flags |= IFA_F_DEPRECATED;
3279 prefered_lft = timeout;
3280 }
081bba5b
NT		 3281
3282 spin_lock_bh(&ifp->lock);
3b9f9a1c 3283 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3284 ifp->tstamp = jiffies;
3285 ifp->valid_lft = valid_lft;
3286 ifp->prefered_lft = prefered_lft;
3287
3288 spin_unlock_bh(&ifp->lock);
3289 if (!(ifp->flags&IFA_F_TENTATIVE))
3290 ipv6_ifa_notify(0, ifp);
081bba5b 3291
46d48046 3292 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3293 expires, flags);
081bba5b
NT		 3294 addrconf_verify(0);
3295
3296 return 0;
3297}
3298
1da177e4
LT		 3299static int
3300inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3301{
3b1e0a65 3302 struct net *net = sock_net(skb->sk);
461d8837
TG		 3303 struct ifaddrmsg *ifm;
3304 struct nlattr *tb[IFA_MAX+1];
1da177e4 3305 struct in6_addr *pfx;
7198f8ce
TG		 3306 struct inet6_ifaddr *ifa;
3307 struct net_device *dev;
55ebaef1
NT		 3308 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3309 u8 ifa_flags;
461d8837 3310 int err;
1da177e4 3311
461d8837
TG		 3312 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3313 if (err < 0)
3314 return err;
3315
3316 ifm = nlmsg_data(nlh);
3317 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3318 if (pfx == NULL)
3319 return -EINVAL;
3320
461d8837 3321 if (tb[IFA_CACHEINFO]) {
0778769d 3322 struct ifa_cacheinfo *ci;
461d8837
TG		 3323
3324 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3325 valid_lft = ci->ifa_valid;
461d8837
TG		 3326 preferred_lft = ci->ifa_prefered;
3327 } else {
3328 preferred_lft = INFINITY_LIFE_TIME;
3329 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3330 }
3331
af284937 3332 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3333 if (dev == NULL)
3334 return -ENODEV;
3335
55ebaef1 3336 /* We ignore other flags so far. */
3b9f9a1c 3337 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3338
1cab3da6 3339 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3340 if (ifa == NULL) {
3341 /*
3342 * It would be best to check for !NLM_F_CREATE here but
3343 * userspace alreay relies on not having to provide this.
3344 */
af284937
DL		 3345 return inet6_addr_add(net, ifm->ifa_index, pfx,
3346 ifm->ifa_prefixlen, ifa_flags,
3347 preferred_lft, valid_lft);
081bba5b
NT		 3348 }
3349
7198f8ce
TG		 3350 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3351 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3352 err = -EEXIST;
3353 else
55ebaef1 3354 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3355
3356 in6_ifa_put(ifa);
3357
3358 return err;
1da177e4
LT		 3359}
3360
101bb229
TG		 3361static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3362 u8 scope, int ifindex)
3363{
3364 struct ifaddrmsg *ifm;
3365
3366 ifm = nlmsg_data(nlh);
3367 ifm->ifa_family = AF_INET6;
3368 ifm->ifa_prefixlen = prefixlen;
3369 ifm->ifa_flags = flags;
3370 ifm->ifa_scope = scope;
3371 ifm->ifa_index = ifindex;
3372}
3373
85486af0
TG		 3374static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3375 unsigned long tstamp, u32 preferred, u32 valid)
3376{
3377 struct ifa_cacheinfo ci;
3378
3379 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3380 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3381 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3382 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3383 ci.ifa_prefered = preferred;
3384 ci.ifa_valid = valid;
3385
3386 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3387}
3388
101bb229
TG		 3389static inline int rt_scope(int ifa_scope)
3390{
3391 if (ifa_scope & IFA_HOST)
3392 return RT_SCOPE_HOST;
3393 else if (ifa_scope & IFA_LINK)
3394 return RT_SCOPE_LINK;
3395 else if (ifa_scope & IFA_SITE)
3396 return RT_SCOPE_SITE;
3397 else
3398 return RT_SCOPE_UNIVERSE;
3399}
3400
0ab6803b
TG		 3401static inline int inet6_ifaddr_msgsize(void)
3402{
339bf98f
TG		 3403 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3404 + nla_total_size(16) /* IFA_ADDRESS */
3405 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3406}
c5396a31 3407
1da177e4 3408static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3409 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3410{
1da177e4 3411 struct nlmsghdr *nlh;
85486af0 3412 u32 preferred, valid;
1da177e4 3413
0ab6803b
TG		 3414 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3415 if (nlh == NULL)
26932566 3416 return -EMSGSIZE;
0ab6803b 3417
101bb229
TG		 3418 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3419 ifa->idev->dev->ifindex);
3420
1da177e4 3421 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3422 preferred = ifa->prefered_lft;
3423 valid = ifa->valid_lft;
3424 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3425 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3426 if (preferred > tval)
3427 preferred -= tval;
3428 else
3429 preferred = 0;
85486af0
TG		 3430 if (valid != INFINITY_LIFE_TIME)
3431 valid -= tval;
1da177e4
LT		 3432 }
3433 } else {
85486af0
TG		 3434 preferred = INFINITY_LIFE_TIME;
3435 valid = INFINITY_LIFE_TIME;
3436 }
3437
0ab6803b 3438 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3439 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3440 nlmsg_cancel(skb, nlh);
3441 return -EMSGSIZE;
3442 }
1da177e4 3443
0ab6803b 3444 return nlmsg_end(skb, nlh);
1da177e4
LT		 3445}
3446
3447static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3448 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3449{
1da177e4 3450 struct nlmsghdr *nlh;
101bb229
TG		 3451 u8 scope = RT_SCOPE_UNIVERSE;
3452 int ifindex = ifmca->idev->dev->ifindex;
3453
3454 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3455 scope = RT_SCOPE_SITE;
1da177e4 3456
0ab6803b
TG		 3457 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3458 if (nlh == NULL)
26932566 3459 return -EMSGSIZE;
85486af0 3460
0ab6803b
TG		 3461 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3462 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3463 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3464 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3465 nlmsg_cancel(skb, nlh);
3466 return -EMSGSIZE;
3467 }
85486af0 3468
0ab6803b 3469 return nlmsg_end(skb, nlh);
1da177e4
LT		 3470}
3471
3472static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3473 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3474{
1da177e4 3475 struct nlmsghdr *nlh;
101bb229
TG		 3476 u8 scope = RT_SCOPE_UNIVERSE;
3477 int ifindex = ifaca->aca_idev->dev->ifindex;
3478
3479 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3480 scope = RT_SCOPE_SITE;
1da177e4 3481
0ab6803b
TG		 3482 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3483 if (nlh == NULL)
26932566 3484 return -EMSGSIZE;
85486af0 3485
0ab6803b
TG		 3486 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3487 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3488 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3489 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3490 nlmsg_cancel(skb, nlh);
3491 return -EMSGSIZE;
3492 }
1da177e4 3493
0ab6803b 3494 return nlmsg_end(skb, nlh);
1da177e4
LT		 3495}
3496
3497enum addr_type_t
3498{
3499 UNICAST_ADDR,
3500 MULTICAST_ADDR,
3501 ANYCAST_ADDR,
3502};
3503
234b27c3
ED		 3504/* called with rcu_read_lock() */
3505static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3506 struct netlink_callback *cb, enum addr_type_t type,
3507 int s_ip_idx, int *p_ip_idx)
3508{
3509 struct inet6_ifaddr *ifa;
3510 struct ifmcaddr6 *ifmca;
3511 struct ifacaddr6 *ifaca;
3512 int err = 1;
3513 int ip_idx = *p_ip_idx;
3514
3515 read_lock_bh(&idev->lock);
3516 switch (type) {
3517 case UNICAST_ADDR:
3518 /* unicast address incl. temp addr */
3519 for (ifa = idev->addr_list; ifa;
3520 ifa = ifa->if_next, ip_idx++) {
3521 if (ip_idx < s_ip_idx)
3522 continue;
3523 err = inet6_fill_ifaddr(skb, ifa,
3524 NETLINK_CB(cb->skb).pid,
3525 cb->nlh->nlmsg_seq,
3526 RTM_NEWADDR,
3527 NLM_F_MULTI);
3528 if (err <= 0)
3529 break;
3530 }
3531 break;
3532 case MULTICAST_ADDR:
3533 /* multicast address */
3534 for (ifmca = idev->mc_list; ifmca;
3535 ifmca = ifmca->next, ip_idx++) {
3536 if (ip_idx < s_ip_idx)
3537 continue;
3538 err = inet6_fill_ifmcaddr(skb, ifmca,
3539 NETLINK_CB(cb->skb).pid,
3540 cb->nlh->nlmsg_seq,
3541 RTM_GETMULTICAST,
3542 NLM_F_MULTI);
3543 if (err <= 0)
3544 break;
3545 }
3546 break;
3547 case ANYCAST_ADDR:
3548 /* anycast address */
3549 for (ifaca = idev->ac_list; ifaca;
3550 ifaca = ifaca->aca_next, ip_idx++) {
3551 if (ip_idx < s_ip_idx)
3552 continue;
3553 err = inet6_fill_ifacaddr(skb, ifaca,
3554 NETLINK_CB(cb->skb).pid,
3555 cb->nlh->nlmsg_seq,
3556 RTM_GETANYCAST,
3557 NLM_F_MULTI);
3558 if (err <= 0)
3559 break;
3560 }
3561 break;
3562 default:
3563 break;
3564 }
3565 read_unlock_bh(&idev->lock);
3566 *p_ip_idx = ip_idx;
3567 return err;
3568}
3569
1da177e4
LT		 3570static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3571 enum addr_type_t type)
3572{
234b27c3
ED		 3573 struct net *net = sock_net(skb->sk);
3574 int h, s_h;
1da177e4
LT		 3575 int idx, ip_idx;
3576 int s_idx, s_ip_idx;
1da177e4 3577 struct net_device *dev;
234b27c3
ED		 3578 struct inet6_dev *idev;
3579 struct hlist_head *head;
3580 struct hlist_node *node;
1ab1457c 3581
234b27c3
ED		 3582 s_h = cb->args[0];
3583 s_idx = idx = cb->args[1];
3584 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3585
234b27c3
ED		 3586 rcu_read_lock();
3587 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3588 idx = 0;
3589 head = &net->dev_index_head[h];
3590 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3591 if (idx < s_idx)
3592 goto cont;
3593 if (idx > s_idx)
3594 s_ip_idx = 0;
3595 ip_idx = 0;
3596 if ((idev = __in6_dev_get(dev)) == NULL)
3597 goto cont;
3598
3599 if (in6_dump_addrs(idev, skb, cb, type,
3600 s_ip_idx, &ip_idx) <= 0)
3601 goto done;
7562f876 3602cont:
234b27c3
ED		 3603 idx++;
3604 }
1da177e4 3605 }
234b27c3
ED		 3606done:
3607 rcu_read_unlock();
3608 cb->args[0] = h;
3609 cb->args[1] = idx;
3610 cb->args[2] = ip_idx;
3611
1da177e4
LT		 3612 return skb->len;
3613}
3614
3615static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3616{
3617 enum addr_type_t type = UNICAST_ADDR;
b854272b 3618
1da177e4
LT		 3619 return inet6_dump_addr(skb, cb, type);
3620}
3621
3622static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3623{
3624 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3625
1da177e4
LT		 3626 return inet6_dump_addr(skb, cb, type);
3627}
3628
3629
3630static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3631{
3632 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3633
1da177e4
LT		 3634 return inet6_dump_addr(skb, cb, type);
3635}
3636
1b29fc2c
TG		 3637static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3638 void *arg)
6c223828 3639{
3b1e0a65 3640 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3641 struct ifaddrmsg *ifm;
3642 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3643 struct in6_addr *addr = NULL;
3644 struct net_device *dev = NULL;
3645 struct inet6_ifaddr *ifa;
3646 struct sk_buff *skb;
6c223828
NT		 3647 int err;
3648
1b29fc2c
TG		 3649 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3650 if (err < 0)
3651 goto errout;
3652
3653 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3654 if (addr == NULL) {
3655 err = -EINVAL;
3656 goto errout;
6c223828 3657 }
6c223828 3658
1b29fc2c 3659 ifm = nlmsg_data(nlh);
6c223828 3660 if (ifm->ifa_index)
6fda7350 3661 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3662
1cab3da6 3663 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3664 err = -EADDRNOTAVAIL;
3665 goto errout;
3666 }
6c223828 3667
0ab6803b 3668 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3669 err = -ENOBUFS;
1b29fc2c 3670 goto errout_ifa;
6c223828
NT		 3671 }
3672
6c223828
NT		 3673 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3674 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3675 if (err < 0) {
3676 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3677 WARN_ON(err == -EMSGSIZE);
3678 kfree_skb(skb);
3679 goto errout_ifa;
3680 }
6fda7350 3681 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3682errout_ifa:
6c223828 3683 in6_ifa_put(ifa);
1b29fc2c 3684errout:
6c223828 3685 return err;
6c223828
NT		 3686}
3687
1da177e4
LT		 3688static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3689{
3690 struct sk_buff *skb;
c346dca1 3691 struct net *net = dev_net(ifa->idev->dev);
5d620266 3692 int err = -ENOBUFS;
1da177e4 3693
0ab6803b 3694 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3695 if (skb == NULL)
3696 goto errout;
3697
3698 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3699 if (err < 0) {
3700 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3701 WARN_ON(err == -EMSGSIZE);
3702 kfree_skb(skb);
3703 goto errout;
3704 }
1ce85fe4
PNA		 3705 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3706 return;
5d620266
TG		 3707errout:
3708 if (err < 0)
6fda7350 3709 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3710}
3711
b6f99a21 3712static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3713 __s32 *array, int bytes)
3714{
04561c1f
TG		 3715 BUG_ON(bytes < (DEVCONF_MAX * 4));
3716
1da177e4
LT		 3717 memset(array, 0, bytes);
3718 array[DEVCONF_FORWARDING] = cnf->forwarding;
3719 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3720 array[DEVCONF_MTU6] = cnf->mtu6;
3721 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3722 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3723 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3724 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3725 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3726 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3727 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3728 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3729#ifdef CONFIG_IPV6_PRIVACY
3730 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3731 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3732 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3733 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3734 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3735#endif
3736 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3737 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3738 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3739#ifdef CONFIG_IPV6_ROUTER_PREF
3740 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3741 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3742#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3743 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3744#endif
930d6ff2 3745#endif
fbea49e1 3746 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3747 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3748#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3749 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3750#endif
7bc570c8
YH		 3751#ifdef CONFIG_IPV6_MROUTE
3752 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3753#endif
778d80be 3754 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3755 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3756 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3757}
3758
339bf98f
TG		 3759static inline size_t inet6_if_nlmsg_size(void)
3760{
3761 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3762 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3763 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3764 + nla_total_size(4) /* IFLA_MTU */
3765 + nla_total_size(4) /* IFLA_LINK */
3766 + nla_total_size( /* IFLA_PROTINFO */
3767 nla_total_size(4) /* IFLA_INET6_FLAGS */
3768 + nla_total_size(sizeof(struct ifla_cacheinfo))
3769 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3770 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3771 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3772 );
3773}
c5396a31 3774
7d720c3e
TH		 3775static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3776 int items, int bytes)
7f7d9a6b
HX		 3777{
3778 int i;
3779 int pad = bytes - sizeof(u64) * items;
3780 BUG_ON(pad < 0);
3781
3782 /* Use put_unaligned() because stats may not be aligned for u64. */
3783 put_unaligned(items, &stats[0]);
3784 for (i = 1; i < items; i++)
3785 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3786
3787 memset(&stats[items], 0, pad);
3788}
3789
3790static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3791 int bytes)
3792{
3793 switch(attrtype) {
3794 case IFLA_INET6_STATS:
7d720c3e 3795 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3796 break;
3797 case IFLA_INET6_ICMP6STATS:
7d720c3e 3798 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3799 break;
3800 }
3801}
3802
1ab1457c 3803static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3804 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3805{
04561c1f 3806 struct net_device *dev = idev->dev;
bf99f1bd 3807 struct nlattr *nla;
04561c1f
TG		 3808 struct ifinfomsg *hdr;
3809 struct nlmsghdr *nlh;
3810 void *protoinfo;
3811 struct ifla_cacheinfo ci;
3812
3813 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3814 if (nlh == NULL)
26932566 3815 return -EMSGSIZE;
04561c1f
TG		 3816
3817 hdr = nlmsg_data(nlh);
3818 hdr->ifi_family = AF_INET6;
3819 hdr->__ifi_pad = 0;
3820 hdr->ifi_type = dev->type;
3821 hdr->ifi_index = dev->ifindex;
3822 hdr->ifi_flags = dev_get_flags(dev);
3823 hdr->ifi_change = 0;
3824
3825 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3826
3827 if (dev->addr_len)
04561c1f 3828 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3829
04561c1f 3830 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3831 if (dev->ifindex != dev->iflink)
04561c1f 3832 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3833
04561c1f
TG		 3834 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3835 if (protoinfo == NULL)
3836 goto nla_put_failure;
1da177e4 3837
04561c1f 3838 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3839
1da177e4
LT		 3840 ci.max_reasm_len = IPV6_MAXPLEN;
3841 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3842 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3843 ci.reachable_time = idev->nd_parms->reachable_time;
3844 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3845 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3846
bf99f1bd
YH		 3847 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3848 if (nla == NULL)
04561c1f 3849 goto nla_put_failure;
bf99f1bd 3850 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3851
bf99f1bd
YH		 3852 /* XXX - MC not implemented */
3853
3854 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3855 if (nla == NULL)
3856 goto nla_put_failure;
3857 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3858
3859 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3860 if (nla == NULL)
3861 goto nla_put_failure;
3862 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3863
04561c1f
TG		 3864 nla_nest_end(skb, protoinfo);
3865 return nlmsg_end(skb, nlh);
1da177e4 3866
04561c1f 3867nla_put_failure:
26932566
PM		 3868 nlmsg_cancel(skb, nlh);
3869 return -EMSGSIZE;
1da177e4
LT		 3870}
3871
3872static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3873{
3b1e0a65 3874 struct net *net = sock_net(skb->sk);
84d2697d 3875 int h, s_h;
434a8a58 3876 int idx = 0, s_idx;
1da177e4
LT		 3877 struct net_device *dev;
3878 struct inet6_dev *idev;
84d2697d
ED		 3879 struct hlist_head *head;
3880 struct hlist_node *node;
1da177e4 3881
84d2697d
ED		 3882 s_h = cb->args[0];
3883 s_idx = cb->args[1];
3884
3885 rcu_read_lock();
3886 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3887 idx = 0;
3888 head = &net->dev_index_head[h];
3889 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3890 if (idx < s_idx)
3891 goto cont;
3892 idev = __in6_dev_get(dev);
3893 if (!idev)
3894 goto cont;
3895 if (inet6_fill_ifinfo(skb, idev,
3896 NETLINK_CB(cb->skb).pid,
3897 cb->nlh->nlmsg_seq,
3898 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3899 goto out;
7562f876 3900cont:
84d2697d
ED		 3901 idx++;
3902 }
1da177e4 3903 }
84d2697d
ED		 3904out:
3905 rcu_read_unlock();
3906 cb->args[1] = idx;
3907 cb->args[0] = h;
1da177e4
LT		 3908
3909 return skb->len;
3910}
3911
3912void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3913{
3914 struct sk_buff *skb;
c346dca1 3915 struct net *net = dev_net(idev->dev);
8d7a76c9 3916 int err = -ENOBUFS;
1ab1457c 3917
339bf98f 3918 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3919 if (skb == NULL)
3920 goto errout;
3921
3922 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3923 if (err < 0) {
3924 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3925 WARN_ON(err == -EMSGSIZE);
3926 kfree_skb(skb);
3927 goto errout;
3928 }
1ce85fe4
PNA		 3929 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3930 return;
8d7a76c9
TG		 3931errout:
3932 if (err < 0)
6fda7350 3933 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3934}
3935
339bf98f
TG		 3936static inline size_t inet6_prefix_nlmsg_size(void)
3937{
3938 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3939 + nla_total_size(sizeof(struct in6_addr))
3940 + nla_total_size(sizeof(struct prefix_cacheinfo));
3941}
c5396a31 3942
1da177e4 3943static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3944 struct prefix_info *pinfo, u32 pid, u32 seq,
3945 int event, unsigned int flags)
1da177e4 3946{
6051e2f4
TG		 3947 struct prefixmsg *pmsg;
3948 struct nlmsghdr *nlh;
1da177e4
LT		 3949 struct prefix_cacheinfo ci;
3950
6051e2f4
TG		 3951 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3952 if (nlh == NULL)
26932566 3953 return -EMSGSIZE;
6051e2f4
TG		 3954
3955 pmsg = nlmsg_data(nlh);
1da177e4 3956 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3957 pmsg->prefix_pad1 = 0;
3958 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3959 pmsg->prefix_ifindex = idev->dev->ifindex;
3960 pmsg->prefix_len = pinfo->prefix_len;
3961 pmsg->prefix_type = pinfo->type;
8a47077a 3962 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3963 pmsg->prefix_flags = 0;
3964 if (pinfo->onlink)
3965 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3966 if (pinfo->autoconf)
3967 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3968
6051e2f4 3969 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3970
3971 ci.preferred_time = ntohl(pinfo->prefered);
3972 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3973 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3974
6051e2f4 3975 return nlmsg_end(skb, nlh);
1da177e4 3976
6051e2f4 3977nla_put_failure:
26932566
PM		 3978 nlmsg_cancel(skb, nlh);
3979 return -EMSGSIZE;
1da177e4
LT		 3980}
3981
1ab1457c 3982static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3983 struct prefix_info *pinfo)
3984{
3985 struct sk_buff *skb;
c346dca1 3986 struct net *net = dev_net(idev->dev);
8c384bfa 3987 int err = -ENOBUFS;
1da177e4 3988
339bf98f 3989 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3990 if (skb == NULL)
3991 goto errout;
3992
3993 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3994 if (err < 0) {
3995 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3996 WARN_ON(err == -EMSGSIZE);
3997 kfree_skb(skb);
3998 goto errout;
3999 }
1ce85fe4
PNA		 4000 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4001 return;
8c384bfa
TG		 4002errout:
4003 if (err < 0)
6fda7350 4004 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4005}
4006
1da177e4
LT		 4007static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4008{
4009 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4010
4011 switch (event) {
4012 case RTM_NEWADDR:
95c385b4
NH		 4013 /*
4014 * If the address was optimistic
4015 * we inserted the route at the start of
4016 * our DAD process, so we don't need
4017 * to do it again
4018 */
4019 if (!(ifp->rt->rt6i_node))
4020 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4021 if (ifp->idev->cnf.forwarding)
4022 addrconf_join_anycast(ifp);
4023 break;
4024 case RTM_DELADDR:
4025 if (ifp->idev->cnf.forwarding)
4026 addrconf_leave_anycast(ifp);
4027 addrconf_leave_solict(ifp->idev, &ifp->addr);
4028 dst_hold(&ifp->rt->u.dst);
e0a1ad73 4029 if (ip6_del_rt(ifp->rt))
1da177e4 4030 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4031 break;
4032 }
4033}
4034
4035static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4036{
8814c4b5 4037 rcu_read_lock_bh();
1da177e4
LT		 4038 if (likely(ifp->idev->dead == 0))
4039 __ipv6_ifa_notify(event, ifp);
8814c4b5 4040 rcu_read_unlock_bh();
1da177e4
LT		 4041}
4042
4043#ifdef CONFIG_SYSCTL
4044
4045static
8d65af78 4046int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4047 void __user *buffer, size_t *lenp, loff_t *ppos)
4048{
4049 int *valp = ctl->data;
4050 int val = *valp;
88af182e 4051 loff_t pos = *ppos;
1da177e4
LT		 4052 int ret;
4053
8d65af78 4054 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4055
c8fecf22 4056 if (write)
b325fddb 4057 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4058 if (ret)
4059 *ppos = pos;
1ab1457c 4060 return ret;
1da177e4
LT		 4061}
4062
56d417b1
BH		 4063static void dev_disable_change(struct inet6_dev *idev)
4064{
4065 if (!idev || !idev->dev)
4066 return;
4067
4068 if (idev->cnf.disable_ipv6)
4069 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4070 else
4071 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4072}
4073
4074static void addrconf_disable_change(struct net *net, __s32 newf)
4075{
4076 struct net_device *dev;
4077 struct inet6_dev *idev;
4078
c6d14c84
ED		 4079 rcu_read_lock();
4080 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4081 idev = __in6_dev_get(dev);
4082 if (idev) {
4083 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4084 idev->cnf.disable_ipv6 = newf;
4085 if (changed)
4086 dev_disable_change(idev);
4087 }
56d417b1 4088 }
c6d14c84 4089 rcu_read_unlock();
56d417b1
BH		 4090}
4091
4092static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4093{
4094 struct net *net;
4095
4096 net = (struct net *)table->extra2;
4097
4098 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4099 return 0;
4100
88af182e
EB		 4101 if (!rtnl_trylock()) {
4102 /* Restore the original values before restarting */
4103 *p = old;
56d417b1 4104 return restart_syscall();
88af182e 4105 }
56d417b1
BH		 4106
4107 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4108 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4109 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4110 addrconf_disable_change(net, newf);
4111 } else if ((!*p) ^ (!old))
4112 dev_disable_change((struct inet6_dev *)table->extra1);
4113
4114 rtnl_unlock();
4115 return 0;
4116}
4117
4118static
8d65af78 4119int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4120 void __user *buffer, size_t *lenp, loff_t *ppos)
4121{
4122 int *valp = ctl->data;
4123 int val = *valp;
88af182e 4124 loff_t pos = *ppos;
56d417b1
BH		 4125 int ret;
4126
8d65af78 4127 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4128
4129 if (write)
4130 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4131 if (ret)
4132 *ppos = pos;
56d417b1
BH		 4133 return ret;
4134}
4135
1da177e4
LT		 4136static struct addrconf_sysctl_table
4137{
4138 struct ctl_table_header *sysctl_header;
f6a07b29 4139 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4140 char *dev_name;
ab32ea5d 4141} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4142 .sysctl_header = NULL,
4143 .addrconf_vars = {
1ab1457c 4144 {
1da177e4 4145 .procname = "forwarding",
1ab1457c 4146 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4147 .maxlen = sizeof(int),
4148 .mode = 0644,
6d9f239a 4149 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4150 },
4151 {
1da177e4 4152 .procname = "hop_limit",
1ab1457c 4153 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4154 .maxlen = sizeof(int),
4155 .mode = 0644,
4156 .proc_handler = proc_dointvec,
4157 },
4158 {
1da177e4
LT		 4159 .procname = "mtu",
4160 .data = &ipv6_devconf.mtu6,
1ab1457c 4161 .maxlen = sizeof(int),
1da177e4 4162 .mode = 0644,
6d9f239a 4163 .proc_handler = proc_dointvec,
1da177e4
LT		 4164 },
4165 {
1da177e4 4166 .procname = "accept_ra",
1ab1457c 4167 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4168 .maxlen = sizeof(int),
4169 .mode = 0644,
6d9f239a 4170 .proc_handler = proc_dointvec,
1da177e4
LT		 4171 },
4172 {
1da177e4 4173 .procname = "accept_redirects",
1ab1457c 4174 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4175 .maxlen = sizeof(int),
4176 .mode = 0644,
6d9f239a 4177 .proc_handler = proc_dointvec,
1da177e4
LT		 4178 },
4179 {
1da177e4 4180 .procname = "autoconf",
1ab1457c 4181 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4182 .maxlen = sizeof(int),
4183 .mode = 0644,
6d9f239a 4184 .proc_handler = proc_dointvec,
1da177e4
LT		 4185 },
4186 {
1da177e4 4187 .procname = "dad_transmits",
1ab1457c 4188 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4189 .maxlen = sizeof(int),
4190 .mode = 0644,
6d9f239a 4191 .proc_handler = proc_dointvec,
1da177e4
LT		 4192 },
4193 {
1da177e4 4194 .procname = "router_solicitations",
1ab1457c 4195 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4196 .maxlen = sizeof(int),
4197 .mode = 0644,
6d9f239a 4198 .proc_handler = proc_dointvec,
1da177e4
LT		 4199 },
4200 {
1da177e4 4201 .procname = "router_solicitation_interval",
1ab1457c 4202 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4203 .maxlen = sizeof(int),
4204 .mode = 0644,
6d9f239a 4205 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4206 },
4207 {
1da177e4 4208 .procname = "router_solicitation_delay",
1ab1457c 4209 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4210 .maxlen = sizeof(int),
4211 .mode = 0644,
6d9f239a 4212 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4213 },
4214 {
1da177e4 4215 .procname = "force_mld_version",
1ab1457c 4216 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4217 .maxlen = sizeof(int),
4218 .mode = 0644,
6d9f239a 4219 .proc_handler = proc_dointvec,
1da177e4
LT		 4220 },
4221#ifdef CONFIG_IPV6_PRIVACY
4222 {
1da177e4 4223 .procname = "use_tempaddr",
1ab1457c 4224 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4225 .maxlen = sizeof(int),
4226 .mode = 0644,
6d9f239a 4227 .proc_handler = proc_dointvec,
1da177e4
LT		 4228 },
4229 {
1da177e4 4230 .procname = "temp_valid_lft",
1ab1457c 4231 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4232 .maxlen = sizeof(int),
4233 .mode = 0644,
6d9f239a 4234 .proc_handler = proc_dointvec,
1da177e4
LT		 4235 },
4236 {
1da177e4 4237 .procname = "temp_prefered_lft",
1ab1457c 4238 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4239 .maxlen = sizeof(int),
4240 .mode = 0644,
6d9f239a 4241 .proc_handler = proc_dointvec,
1da177e4
LT		 4242 },
4243 {
1da177e4 4244 .procname = "regen_max_retry",
1ab1457c 4245 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4246 .maxlen = sizeof(int),
4247 .mode = 0644,
6d9f239a 4248 .proc_handler = proc_dointvec,
1da177e4
LT		 4249 },
4250 {
1da177e4 4251 .procname = "max_desync_factor",
1ab1457c 4252 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4253 .maxlen = sizeof(int),
4254 .mode = 0644,
6d9f239a 4255 .proc_handler = proc_dointvec,
1da177e4
LT		 4256 },
4257#endif
4258 {
1da177e4
LT		 4259 .procname = "max_addresses",
4260 .data = &ipv6_devconf.max_addresses,
4261 .maxlen = sizeof(int),
4262 .mode = 0644,
6d9f239a 4263 .proc_handler = proc_dointvec,
1da177e4 4264 },
65f5c7c1 4265 {
65f5c7c1 4266 .procname = "accept_ra_defrtr",
1ab1457c 4267 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4268 .maxlen = sizeof(int),
4269 .mode = 0644,
6d9f239a 4270 .proc_handler = proc_dointvec,
65f5c7c1 4271 },
c4fd30eb 4272 {
c4fd30eb 4273 .procname = "accept_ra_pinfo",
1ab1457c 4274 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4275 .maxlen = sizeof(int),
4276 .mode = 0644,
6d9f239a 4277 .proc_handler = proc_dointvec,
c4fd30eb 4278 },
930d6ff2
YH		 4279#ifdef CONFIG_IPV6_ROUTER_PREF
4280 {
930d6ff2
YH		 4281 .procname = "accept_ra_rtr_pref",
4282 .data = &ipv6_devconf.accept_ra_rtr_pref,
4283 .maxlen = sizeof(int),
4284 .mode = 0644,
6d9f239a 4285 .proc_handler = proc_dointvec,
930d6ff2 4286 },
52e16356 4287 {
52e16356
YH		 4288 .procname = "router_probe_interval",
4289 .data = &ipv6_devconf.rtr_probe_interval,
4290 .maxlen = sizeof(int),
4291 .mode = 0644,
6d9f239a 4292 .proc_handler = proc_dointvec_jiffies,
52e16356 4293 },
fa03ef38 4294#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4295 {
09c884d4
YH		 4296 .procname = "accept_ra_rt_info_max_plen",
4297 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4298 .maxlen = sizeof(int),
4299 .mode = 0644,
6d9f239a 4300 .proc_handler = proc_dointvec,
09c884d4
YH		 4301 },
4302#endif
930d6ff2 4303#endif
fbea49e1 4304 {
fbea49e1
YH		 4305 .procname = "proxy_ndp",
4306 .data = &ipv6_devconf.proxy_ndp,
4307 .maxlen = sizeof(int),
4308 .mode = 0644,
6d9f239a 4309 .proc_handler = proc_dointvec,
fbea49e1 4310 },
0bcbc926 4311 {
0bcbc926
YH		 4312 .procname = "accept_source_route",
4313 .data = &ipv6_devconf.accept_source_route,
4314 .maxlen = sizeof(int),
4315 .mode = 0644,
6d9f239a 4316 .proc_handler = proc_dointvec,
0bcbc926 4317 },
95c385b4
NH		 4318#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4319 {
95c385b4
NH		 4320 .procname = "optimistic_dad",
4321 .data = &ipv6_devconf.optimistic_dad,
4322 .maxlen = sizeof(int),
4323 .mode = 0644,
6d9f239a 4324 .proc_handler = proc_dointvec,
95c385b4
NH		 4325
4326 },
7bc570c8
YH		 4327#endif
4328#ifdef CONFIG_IPV6_MROUTE
4329 {
7bc570c8
YH		 4330 .procname = "mc_forwarding",
4331 .data = &ipv6_devconf.mc_forwarding,
4332 .maxlen = sizeof(int),
a4e6db07 4333 .mode = 0444,
6d9f239a 4334 .proc_handler = proc_dointvec,
7bc570c8 4335 },
95c385b4 4336#endif
778d80be 4337 {
778d80be
YH		 4338 .procname = "disable_ipv6",
4339 .data = &ipv6_devconf.disable_ipv6,
4340 .maxlen = sizeof(int),
4341 .mode = 0644,
56d417b1 4342 .proc_handler = addrconf_sysctl_disable,
778d80be 4343 },
1b34be74 4344 {
1b34be74
YH		 4345 .procname = "accept_dad",
4346 .data = &ipv6_devconf.accept_dad,
4347 .maxlen = sizeof(int),
4348 .mode = 0644,
6d9f239a 4349 .proc_handler = proc_dointvec,
1b34be74 4350 },
f7734fdf 4351 {
f7734fdf
OP		 4352 .procname = "force_tllao",
4353 .data = &ipv6_devconf.force_tllao,
4354 .maxlen = sizeof(int),
4355 .mode = 0644,
4356 .proc_handler = proc_dointvec
4357 },
1da177e4 4358 {
f8572d8f 4359 /* sentinel */
1da177e4
LT		 4360 }
4361 },
1da177e4
LT		 4362};
4363
bff16c2f 4364static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4365 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4366{
4367 int i;
1da177e4 4368 struct addrconf_sysctl_table *t;
1da177e4 4369
1dab6222
PE		 4370#define ADDRCONF_CTL_PATH_DEV 3
4371
4372 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4373 { .procname = "net", },
4374 { .procname = "ipv6", },
4375 { .procname = "conf", },
1dab6222
PE		 4376 { /* to be set */ },
4377 { },
4378 };
4379
4380
af879cc7 4381 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4382 if (t == NULL)
f68635e6
PE		 4383 goto out;
4384
1da177e4
LT		 4385 for (i=0; t->addrconf_vars[i].data; i++) {
4386 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4387 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4388 t->addrconf_vars[i].extra2 = net;
1da177e4 4389 }
1da177e4 4390
1ab1457c
YH		 4391 /*
4392 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4393 * by sysctl and we wouldn't want anyone to change it under our feet
4394 * (see SIOCSIFNAME).
1ab1457c 4395 */
1dab6222
PE		 4396 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4397 if (!t->dev_name)
f68635e6 4398 goto free;
1da177e4 4399
1dab6222 4400 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4401
bff16c2f 4402 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4403 t->addrconf_vars);
1da177e4
LT		 4404 if (t->sysctl_header == NULL)
4405 goto free_procname;
f68635e6
PE		 4406
4407 p->sysctl = t;
95897312 4408 return 0;
1da177e4 4409
f68635e6 4410free_procname:
1dab6222 4411 kfree(t->dev_name);
f68635e6 4412free:
1da177e4 4413 kfree(t);
f68635e6 4414out:
95897312 4415 return -ENOBUFS;
1da177e4
LT		 4416}
4417
408c4768
PE		 4418static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4419{
4420 struct addrconf_sysctl_table *t;
4421
4422 if (p->sysctl == NULL)
4423 return;
4424
4425 t = p->sysctl;
4426 p->sysctl = NULL;
4427 unregister_sysctl_table(t->sysctl_header);
4428 kfree(t->dev_name);
4429 kfree(t);
4430}
4431
f52295a9
PE		 4432static void addrconf_sysctl_register(struct inet6_dev *idev)
4433{
54716e3b 4434 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4435 &ndisc_ifinfo_sysctl_change);
c346dca1 4436 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4437 idev, &idev->cnf);
f52295a9
PE		 4438}
4439
408c4768 4440static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4441{
408c4768
PE		 4442 __addrconf_sysctl_unregister(&idev->cnf);
4443 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4444}
4445
4446
4447#endif
4448
2c8c1e72 4449static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4450{
4451 int err;
4452 struct ipv6_devconf *all, *dflt;
4453
4454 err = -ENOMEM;
4455 all = &ipv6_devconf;
4456 dflt = &ipv6_devconf_dflt;
4457
09ad9bc7 4458 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4459 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4460 if (all == NULL)
4461 goto err_alloc_all;
4462
4463 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4464 if (dflt == NULL)
4465 goto err_alloc_dflt;
56d417b1
BH		 4466 } else {
4467 /* these will be inherited by all namespaces */
4468 dflt->autoconf = ipv6_defaults.autoconf;
4469 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4470 }
4471
4472 net->ipv6.devconf_all = all;
4473 net->ipv6.devconf_dflt = dflt;
4474
4475#ifdef CONFIG_SYSCTL
f8572d8f 4476 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4477 if (err < 0)
4478 goto err_reg_all;
4479
f8572d8f 4480 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4481 if (err < 0)
4482 goto err_reg_dflt;
4483#endif
4484 return 0;
4485
4486#ifdef CONFIG_SYSCTL
4487err_reg_dflt:
4488 __addrconf_sysctl_unregister(all);
4489err_reg_all:
4490 kfree(dflt);
4491#endif
4492err_alloc_dflt:
4493 kfree(all);
4494err_alloc_all:
4495 return err;
4496}
4497
2c8c1e72 4498static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4499{
4500#ifdef CONFIG_SYSCTL
4501 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4502 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4503#endif
09ad9bc7 4504 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4505 kfree(net->ipv6.devconf_dflt);
4506 kfree(net->ipv6.devconf_all);
4507 }
4508}
4509
4510static struct pernet_operations addrconf_ops = {
4511 .init = addrconf_init_net,
4512 .exit = addrconf_exit_net,
4513};
4514
1da177e4
LT		 4515/*
4516 * Device notifier
4517 */
4518
4519int register_inet6addr_notifier(struct notifier_block *nb)
4520{
1ab1457c 4521 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4522}
4523
7159039a
YH		 4524EXPORT_SYMBOL(register_inet6addr_notifier);
4525
1da177e4
LT		 4526int unregister_inet6addr_notifier(struct notifier_block *nb)
4527{
1ab1457c 4528 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4529}
4530
7159039a
YH		 4531EXPORT_SYMBOL(unregister_inet6addr_notifier);
4532
1da177e4
LT		 4533/*
4534 * Init / cleanup code
4535 */
4536
4537int __init addrconf_init(void)
4538{
c2e21293 4539 int i, err;
2a8cc6c8
YH		 4540
4541 if ((err = ipv6_addr_label_init()) < 0) {
4542 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4543 err);
4544 return err;
4545 }
1da177e4 4546
e0da5a48
PE		 4547 register_pernet_subsys(&addrconf_ops);
4548
1da177e4
LT		 4549 /* The addrconf netdev notifier requires that loopback_dev
4550 * has it's ipv6 private information allocated and setup
4551 * before it can bring up and give link-local addresses
4552 * to other devices which are up.
4553 *
4554 * Unfortunately, loopback_dev is not necessarily the first
4555 * entry in the global dev_base list of net devices. In fact,
4556 * it is likely to be the very last entry on that list.
4557 * So this causes the notifier registry below to try and
4558 * give link-local addresses to all devices besides loopback_dev
4559 * first, then loopback_dev, which cases all the non-loopback_dev
4560 * devices to fail to get a link-local address.
4561 *
4562 * So, as a temporary fix, allocate the ipv6 structure for
4563 * loopback_dev first by hand.
4564 * Longer term, all of the dependencies ipv6 has upon the loopback
4565 * device and it being up should be removed.
4566 */
4567 rtnl_lock();
2774c7ab 4568 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4569 err = -ENOMEM;
4570 rtnl_unlock();
4571 if (err)
e0da5a48 4572 goto errlo;
1da177e4 4573
c2e21293 4574 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4575 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4576
1da177e4
LT		 4577 register_netdevice_notifier(&ipv6_dev_notf);
4578
1da177e4 4579 addrconf_verify(0);
c127ea2c
TG		 4580
4581 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4582 if (err < 0)
4583 goto errout;
4584
4585 /* Only the first call to __rtnl_register can fail */
4586 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4587 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4588 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4589 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4590 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4591
2a8cc6c8
YH		 4592 ipv6_addr_label_rtnl_register();
4593
1da177e4 4594 return 0;
c127ea2c
TG		 4595errout:
4596 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4597errlo:
4598 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4599
4600 return err;
1da177e4
LT		 4601}
4602
09f7709f 4603void addrconf_cleanup(void)
1da177e4 4604{
176c39af 4605 struct net_device *dev;
1da177e4
LT		 4606 int i;
4607
4608 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4609 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4610
4611 rtnl_lock();
4612
176c39af
DL		 4613 /* clean dev list */
4614 for_each_netdev(&init_net, dev) {
4615 if (__in6_dev_get(dev) == NULL)
4616 continue;
4617 addrconf_ifdown(dev, 1);
4618 }
4619 addrconf_ifdown(init_net.loopback_dev, 2);
4620
1da177e4
LT		 4621 /*
4622 * Check hash table.
4623 */
1da177e4 4624 write_lock_bh(&addrconf_hash_lock);
c2e21293 4625 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4626 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
1da177e4
LT		 4627 write_unlock_bh(&addrconf_hash_lock);
4628
4629 del_timer(&addr_chk_timer);
1da177e4 4630 rtnl_unlock();
1da177e4 4631}
Clone of davem's net-next-2.6 tree