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ipv6: convert temporary address list to list macros
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#ifdef CONFIG_SYSCTL
57#include <linux/sysctl.h>
58#endif
4fc268d2 59#include <linux/capability.h>
1da177e4
LT		 60#include <linux/delay.h>
61#include <linux/notifier.h>
543537bd 62#include <linux/string.h>
1da177e4 63
457c4cbc 64#include <net/net_namespace.h>
1da177e4
LT		 65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
5d620266 75#include <net/netlink.h>
f24e3d65 76#include <net/pkt_sched.h>
1da177e4
LT		 77#include <linux/if_tunnel.h>
78#include <linux/rtnetlink.h>
79
80#ifdef CONFIG_IPV6_PRIVACY
81#include <linux/random.h>
1da177e4
LT		 82#endif
83
84#include <asm/uaccess.h>
7f7d9a6b 85#include <asm/unaligned.h>
1da177e4
LT		 86
87#include <linux/proc_fs.h>
88#include <linux/seq_file.h>
89
90/* Set to 3 to get tracing... */
91#define ACONF_DEBUG 2
92
93#if ACONF_DEBUG >= 3
94#define ADBG(x) printk x
95#else
96#define ADBG(x)
97#endif
98
99#define INFINITY_LIFE_TIME 0xFFFFFFFF
100#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102#ifdef CONFIG_SYSCTL
f52295a9 103static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 104static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105#else
106static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107{
108}
109
110static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111{
112}
1da177e4
LT		 113#endif
114
115#ifdef CONFIG_IPV6_PRIVACY
116static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 117static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 118static void ipv6_regen_rndid(unsigned long data);
119
120static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 121#endif
122
1b34be74 123static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
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
IJ		 530 WARN_ON(ifp->if_next != NULL);
531 WARN_ON(ifp->lst_next != NULL);
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);
646 ifa->timer.data = (unsigned long) ifa;
647 ifa->scope = scope;
648 ifa->prefix_len = pfxlen;
649 ifa->flags = flags | IFA_F_TENTATIVE;
650 ifa->cstamp = ifa->tstamp = jiffies;
651
57f5f544
KF		 652 ifa->rt = rt;
653
95c385b4
NH		 654 /*
655 * part one of RFC 4429, section 3.3
656 * We should not configure an address as
657 * optimistic if we do not yet know the link
658 * layer address of our nexhop router
659 */
660
661 if (rt->rt6i_nexthop == NULL)
662 ifa->flags &= ~IFA_F_OPTIMISTIC;
663
1da177e4
LT		 664 ifa->idev = idev;
665 in6_dev_hold(idev);
666 /* For caller */
667 in6_ifa_hold(ifa);
668
669 /* Add to big hash table */
670 hash = ipv6_addr_hash(addr);
671
672 ifa->lst_next = inet6_addr_lst[hash];
673 inet6_addr_lst[hash] = ifa;
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);
721 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
722 ifap = &ifa->lst_next) {
723 if (ifa == ifp) {
724 *ifap = ifa->lst_next;
725 __in6_ifa_put(ifp);
726 ifa->lst_next = NULL;
727 break;
728 }
729 }
730 write_unlock_bh(&addrconf_hash_lock);
731
732 write_lock_bh(&idev->lock);
733#ifdef CONFIG_IPV6_PRIVACY
734 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 735 list_del(&ifp->tmp_list);
736 if (ifp->ifpub) {
737 in6_ifa_put(ifp->ifpub);
738 ifp->ifpub = NULL;
1da177e4 739 }
372e6c8f 740 __in6_ifa_put(ifp);
1da177e4
LT		 741 }
742#endif
743
1d142804 744 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 745 if (ifa == ifp) {
746 *ifap = ifa->if_next;
747 __in6_ifa_put(ifp);
748 ifa->if_next = NULL;
749 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
750 break;
751 deleted = 1;
1d142804 752 continue;
1da177e4
LT		 753 } else if (ifp->flags & IFA_F_PERMANENT) {
754 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
755 ifp->prefix_len)) {
756 if (ifa->flags & IFA_F_PERMANENT) {
757 onlink = 1;
758 if (deleted)
759 break;
760 } else {
761 unsigned long lifetime;
762
763 if (!onlink)
764 onlink = -1;
765
766 spin_lock(&ifa->lock);
4bed72e4
YH		 767
768 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
769 /*
770 * Note: Because this address is
771 * not permanent, lifetime <
772 * LONG_MAX / HZ here.
773 */
1da177e4
LT		 774 if (time_before(expires,
775 ifa->tstamp + lifetime * HZ))
776 expires = ifa->tstamp + lifetime * HZ;
777 spin_unlock(&ifa->lock);
778 }
779 }
780 }
1d142804 781 ifap = &ifa->if_next;
1da177e4
LT		 782 }
783 write_unlock_bh(&idev->lock);
784
b2238566
AV		 785 addrconf_del_timer(ifp);
786
1da177e4
LT		 787 ipv6_ifa_notify(RTM_DELADDR, ifp);
788
e041c683 789 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 790
1da177e4
LT		 791 /*
792 * Purge or update corresponding prefix
793 *
794 * 1) we don't purge prefix here if address was not permanent.
795 * prefix is managed by its own lifetime.
796 * 2) if there're no addresses, delete prefix.
797 * 3) if there're still other permanent address(es),
798 * corresponding prefix is still permanent.
799 * 4) otherwise, update prefix lifetime to the
800 * longest valid lifetime among the corresponding
801 * addresses on the device.
802 * Note: subsequent RA will update lifetime.
803 *
804 * --yoshfuji
805 */
806 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
807 struct in6_addr prefix;
808 struct rt6_info *rt;
c346dca1 809 struct net *net = dev_net(ifp->idev->dev);
1da177e4 810 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 811 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 812
2b5ead46 813 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 814 if (onlink == 0) {
e0a1ad73 815 ip6_del_rt(rt);
1da177e4
LT		 816 rt = NULL;
817 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
818 rt->rt6i_expires = expires;
819 rt->rt6i_flags |= RTF_EXPIRES;
820 }
821 }
822 dst_release(&rt->u.dst);
823 }
824
825 in6_ifa_put(ifp);
826}
827
828#ifdef CONFIG_IPV6_PRIVACY
829static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
830{
831 struct inet6_dev *idev = ifp->idev;
832 struct in6_addr addr, *tmpaddr;
833 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 834 unsigned long regen_advance;
1da177e4
LT		 835 int tmp_plen;
836 int ret = 0;
837 int max_addresses;
95c385b4 838 u32 addr_flags;
1da177e4
LT		 839
840 write_lock(&idev->lock);
841 if (ift) {
842 spin_lock_bh(&ift->lock);
843 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
844 spin_unlock_bh(&ift->lock);
845 tmpaddr = &addr;
846 } else {
847 tmpaddr = NULL;
848 }
849retry:
850 in6_dev_hold(idev);
851 if (idev->cnf.use_tempaddr <= 0) {
852 write_unlock(&idev->lock);
853 printk(KERN_INFO
854 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
855 in6_dev_put(idev);
856 ret = -1;
857 goto out;
858 }
859 spin_lock_bh(&ifp->lock);
860 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
861 idev->cnf.use_tempaddr = -1; /*XXX*/
862 spin_unlock_bh(&ifp->lock);
863 write_unlock(&idev->lock);
864 printk(KERN_WARNING
865 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
866 in6_dev_put(idev);
867 ret = -1;
868 goto out;
869 }
870 in6_ifa_hold(ifp);
871 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
872 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
873 spin_unlock_bh(&ifp->lock);
874 write_unlock(&idev->lock);
875 printk(KERN_WARNING
876 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
877 in6_ifa_put(ifp);
878 in6_dev_put(idev);
879 ret = -1;
880 goto out;
881 }
882 memcpy(&addr.s6_addr[8], idev->rndid, 8);
883 tmp_valid_lft = min_t(__u32,
884 ifp->valid_lft,
885 idev->cnf.temp_valid_lft);
1ab1457c
YH		 886 tmp_prefered_lft = min_t(__u32,
887 ifp->prefered_lft,
1da177e4
LT		 888 idev->cnf.temp_prefered_lft - desync_factor / HZ);
889 tmp_plen = ifp->prefix_len;
890 max_addresses = idev->cnf.max_addresses;
891 tmp_cstamp = ifp->cstamp;
892 tmp_tstamp = ifp->tstamp;
893 spin_unlock_bh(&ifp->lock);
894
eac55bf9
BB		 895 regen_advance = idev->cnf.regen_max_retry *
896 idev->cnf.dad_transmits *
897 idev->nd_parms->retrans_time / HZ;
1da177e4 898 write_unlock(&idev->lock);
95c385b4 899
eac55bf9
BB		 900 /* A temporary address is created only if this calculated Preferred
901 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
902 * an implementation must not create a temporary address with a zero
903 * Preferred Lifetime.
904 */
905 if (tmp_prefered_lft <= regen_advance) {
906 in6_ifa_put(ifp);
907 in6_dev_put(idev);
908 ret = -1;
909 goto out;
910 }
911
95c385b4
NH		 912 addr_flags = IFA_F_TEMPORARY;
913 /* set in addrconf_prefix_rcv() */
914 if (ifp->flags & IFA_F_OPTIMISTIC)
915 addr_flags |= IFA_F_OPTIMISTIC;
916
1da177e4 917 ift = !max_addresses ||
1ab1457c 918 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 919 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 920 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
921 addr_flags) : NULL;
1da177e4
LT		 922 if (!ift || IS_ERR(ift)) {
923 in6_ifa_put(ifp);
924 in6_dev_put(idev);
925 printk(KERN_INFO
926 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
927 tmpaddr = &addr;
928 write_lock(&idev->lock);
929 goto retry;
930 }
931
932 spin_lock_bh(&ift->lock);
933 ift->ifpub = ifp;
934 ift->valid_lft = tmp_valid_lft;
935 ift->prefered_lft = tmp_prefered_lft;
936 ift->cstamp = tmp_cstamp;
937 ift->tstamp = tmp_tstamp;
938 spin_unlock_bh(&ift->lock);
939
940 addrconf_dad_start(ift, 0);
941 in6_ifa_put(ift);
942 in6_dev_put(idev);
943out:
944 return ret;
945}
946#endif
947
948/*
072047e4 949 * Choose an appropriate source address (RFC3484)
1da177e4 950 */
a9b05723
YH		 951enum {
952 IPV6_SADDR_RULE_INIT = 0,
953 IPV6_SADDR_RULE_LOCAL,
954 IPV6_SADDR_RULE_SCOPE,
955 IPV6_SADDR_RULE_PREFERRED,
956#ifdef CONFIG_IPV6_MIP6
957 IPV6_SADDR_RULE_HOA,
958#endif
959 IPV6_SADDR_RULE_OIF,
960 IPV6_SADDR_RULE_LABEL,
961#ifdef CONFIG_IPV6_PRIVACY
962 IPV6_SADDR_RULE_PRIVACY,
963#endif
964 IPV6_SADDR_RULE_ORCHID,
965 IPV6_SADDR_RULE_PREFIX,
966 IPV6_SADDR_RULE_MAX
967};
968
072047e4 969struct ipv6_saddr_score {
a9b05723
YH		 970 int rule;
971 int addr_type;
972 struct inet6_ifaddr *ifa;
973 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
974 int scopedist;
975 int matchlen;
072047e4
YH		 976};
977
a9b05723 978struct ipv6_saddr_dst {
9acd9f3a 979 const struct in6_addr *addr;
a9b05723
YH		 980 int ifindex;
981 int scope;
982 int label;
7cbca67c 983 unsigned int prefs;
a9b05723 984};
072047e4 985
b6f99a21 986static inline int ipv6_saddr_preferred(int type)
1da177e4 987{
45bb0060 988 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 989 return 1;
990 return 0;
1da177e4
LT		 991}
992
3de23255
BT		 993static int ipv6_get_saddr_eval(struct net *net,
994 struct ipv6_saddr_score *score,
a9b05723
YH		 995 struct ipv6_saddr_dst *dst,
996 int i)
997{
998 int ret;
999
1000 if (i <= score->rule) {
1001 switch (i) {
1002 case IPV6_SADDR_RULE_SCOPE:
1003 ret = score->scopedist;
1004 break;
1005 case IPV6_SADDR_RULE_PREFIX:
1006 ret = score->matchlen;
1007 break;
1008 default:
1009 ret = !!test_bit(i, score->scorebits);
1010 }
1011 goto out;
1012 }
1013
1014 switch (i) {
1015 case IPV6_SADDR_RULE_INIT:
1016 /* Rule 0: remember if hiscore is not ready yet */
1017 ret = !!score->ifa;
1018 break;
1019 case IPV6_SADDR_RULE_LOCAL:
1020 /* Rule 1: Prefer same address */
1021 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1022 break;
1023 case IPV6_SADDR_RULE_SCOPE:
1024 /* Rule 2: Prefer appropriate scope
1025 *
1026 * ret
1027 * ^
1028 * -1 | d 15
1029 * ---+--+-+---> scope
1030 * |
1031 * | d is scope of the destination.
1032 * B-d | \
1033 * | \ <- smaller scope is better if
1034 * B-15 | \ if scope is enough for destinaion.
1035 * | ret = B - scope (-1 <= scope >= d <= 15).
1036 * d-C-1 | /
1037 * |/ <- greater is better
1038 * -C / if scope is not enough for destination.
1039 * /| ret = scope - C (-1 <= d < scope <= 15).
1040 *
1041 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1042 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1043 * Assume B = 0 and we get C > 29.
1044 */
1045 ret = __ipv6_addr_src_scope(score->addr_type);
1046 if (ret >= dst->scope)
1047 ret = -ret;
1048 else
1049 ret -= 128; /* 30 is enough */
1050 score->scopedist = ret;
1051 break;
1052 case IPV6_SADDR_RULE_PREFERRED:
1053 /* Rule 3: Avoid deprecated and optimistic addresses */
1054 ret = ipv6_saddr_preferred(score->addr_type) ||
1055 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1056 break;
1057#ifdef CONFIG_IPV6_MIP6
1058 case IPV6_SADDR_RULE_HOA:
7cbca67c 1059 {
a9b05723 1060 /* Rule 4: Prefer home address */
7cbca67c
YH		 1061 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1062 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1063 break;
7cbca67c 1064 }
a9b05723
YH		 1065#endif
1066 case IPV6_SADDR_RULE_OIF:
1067 /* Rule 5: Prefer outgoing interface */
1068 ret = (!dst->ifindex ||
1069 dst->ifindex == score->ifa->idev->dev->ifindex);
1070 break;
1071 case IPV6_SADDR_RULE_LABEL:
1072 /* Rule 6: Prefer matching label */
3de23255
BT		 1073 ret = ipv6_addr_label(net,
1074 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1075 score->ifa->idev->dev->ifindex) == dst->label;
1076 break;
1077#ifdef CONFIG_IPV6_PRIVACY
1078 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1079 {
a9b05723
YH		 1080 /* Rule 7: Prefer public address
1081 * Note: prefer temprary address if use_tempaddr >= 2
1082 */
7cbca67c
YH		 1083 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1084 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1085 score->ifa->idev->cnf.use_tempaddr >= 2;
1086 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1087 break;
7cbca67c 1088 }
a9b05723
YH		 1089#endif
1090 case IPV6_SADDR_RULE_ORCHID:
1091 /* Rule 8-: Prefer ORCHID vs ORCHID or
1092 * non-ORCHID vs non-ORCHID
1093 */
1094 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1095 ipv6_addr_orchid(dst->addr));
1096 break;
1097 case IPV6_SADDR_RULE_PREFIX:
1098 /* Rule 8: Use longest matching prefix */
1099 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1100 dst->addr);
1101 break;
1102 default:
1103 ret = 0;
1104 }
1105
1106 if (ret)
1107 __set_bit(i, score->scorebits);
1108 score->rule = i;
1109out:
1110 return ret;
1111}
1112
191cd582 1113int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1114 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1115 struct in6_addr *saddr)
1da177e4 1116{
a9b05723
YH		 1117 struct ipv6_saddr_score scores[2],
1118 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1119 struct ipv6_saddr_dst dst;
072047e4 1120 struct net_device *dev;
a9b05723 1121 int dst_type;
1da177e4 1122
a9b05723
YH		 1123 dst_type = __ipv6_addr_type(daddr);
1124 dst.addr = daddr;
1125 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1126 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1127 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1128 dst.prefs = prefs;
a9b05723
YH		 1129
1130 hiscore->rule = -1;
1131 hiscore->ifa = NULL;
1da177e4 1132
8814c4b5 1133 rcu_read_lock();
1da177e4 1134
c6d14c84 1135 for_each_netdev_rcu(net, dev) {
072047e4 1136 struct inet6_dev *idev;
072047e4 1137
a9b05723 1138 /* Candidate Source Address (section 4)
072047e4
YH		 1139 * - multicast and link-local destination address,
1140 * the set of candidate source address MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same link as the outgoing
1143 * interface.
1144 * (- For site-local destination addresses, the
1145 * set of candidate source addresses MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same site as the outgoing
1148 * interface.)
1149 */
a9b05723
YH		 1150 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1151 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1152 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1153 continue;
1da177e4 1154
1da177e4 1155 idev = __in6_dev_get(dev);
072047e4
YH		 1156 if (!idev)
1157 continue;
1158
1159 read_lock_bh(&idev->lock);
a9b05723
YH		 1160 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1161 int i;
072047e4 1162
a9b05723 1163 /*
6b3ae80a
YH		 1164 * - Tentative Address (RFC2462 section 5.4)
1165 * - A tentative address is not considered
1166 * "assigned to an interface" in the traditional
95c385b4 1167 * sense, unless it is also flagged as optimistic.
6b3ae80a 1168 * - Candidate Source Address (section 4)
072047e4
YH		 1169 * - In any case, anycast addresses, multicast
1170 * addresses, and the unspecified address MUST
1171 * NOT be included in a candidate set.
1172 */
a9b05723
YH		 1173 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1174 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1175 continue;
a9b05723
YH		 1176
1177 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1178
1179 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1180 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1181 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1182 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1183 "assigned as unicast address on %s",
1184 dev->name);
1185 continue;
1186 }
1187
a9b05723
YH		 1188 score->rule = -1;
1189 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1190
1191 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1192 int minihiscore, miniscore;
1193
3de23255
BT		 1194 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1195 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1196
1197 if (minihiscore > miniscore) {
1198 if (i == IPV6_SADDR_RULE_SCOPE &&
1199 score->scopedist > 0) {
1200 /*
1201 * special case:
1202 * each remaining entry
1203 * has too small (not enough)
1204 * scope, because ifa entries
1205 * are sorted by their scope
1206 * values.
1207 */
1208 goto try_nextdev;
1209 }
1210 break;
1211 } else if (minihiscore < miniscore) {
a9b05723
YH		 1212 if (hiscore->ifa)
1213 in6_ifa_put(hiscore->ifa);
1214
1215 in6_ifa_hold(score->ifa);
1216
a0bffffc 1217 swap(hiscore, score);
a9b05723
YH		 1218
1219 /* restore our iterator */
1220 score->ifa = hiscore->ifa;
1221
1222 break;
1da177e4 1223 }
072047e4 1224 }
1da177e4 1225 }
a9b05723 1226try_nextdev:
072047e4 1227 read_unlock_bh(&idev->lock);
1da177e4 1228 }
8814c4b5 1229 rcu_read_unlock();
1da177e4 1230
a9b05723 1231 if (!hiscore->ifa)
072047e4 1232 return -EADDRNOTAVAIL;
1ab1457c 1233
a9b05723
YH		 1234 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1235 in6_ifa_put(hiscore->ifa);
072047e4 1236 return 0;
1da177e4
LT		 1237}
1238
5e5f3f0f 1239EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1240
95c385b4
NH		 1241int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1242 unsigned char banned_flags)
1da177e4
LT		 1243{
1244 struct inet6_dev *idev;
1245 int err = -EADDRNOTAVAIL;
1246
8814c4b5 1247 rcu_read_lock();
1da177e4
LT		 1248 if ((idev = __in6_dev_get(dev)) != NULL) {
1249 struct inet6_ifaddr *ifp;
1250
1251 read_lock_bh(&idev->lock);
1252 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1253 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1254 ipv6_addr_copy(addr, &ifp->addr);
1255 err = 0;
1256 break;
1257 }
1258 }
1259 read_unlock_bh(&idev->lock);
1260 }
8814c4b5 1261 rcu_read_unlock();
1da177e4
LT		 1262 return err;
1263}
1264
1265static int ipv6_count_addresses(struct inet6_dev *idev)
1266{
1267 int cnt = 0;
1268 struct inet6_ifaddr *ifp;
1269
1270 read_lock_bh(&idev->lock);
1271 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1272 cnt++;
1273 read_unlock_bh(&idev->lock);
1274 return cnt;
1275}
1276
bfeade08
DL		 1277int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1278 struct net_device *dev, int strict)
1da177e4
LT		 1279{
1280 struct inet6_ifaddr * ifp;
1281 u8 hash = ipv6_addr_hash(addr);
1282
1283 read_lock_bh(&addrconf_hash_lock);
1284 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1285 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1286 continue;
1da177e4
LT		 1287 if (ipv6_addr_equal(&ifp->addr, addr) &&
1288 !(ifp->flags&IFA_F_TENTATIVE)) {
1289 if (dev == NULL || ifp->idev->dev == dev ||
1290 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1291 break;
1292 }
1293 }
1294 read_unlock_bh(&addrconf_hash_lock);
1295 return ifp != NULL;
1296}
7159039a
YH		 1297EXPORT_SYMBOL(ipv6_chk_addr);
1298
1da177e4 1299static
06bfe655
DL		 1300int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1301 struct net_device *dev)
1da177e4
LT		 1302{
1303 struct inet6_ifaddr * ifp;
1304 u8 hash = ipv6_addr_hash(addr);
1305
1306 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1307 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1308 continue;
1da177e4
LT		 1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1311 break;
1312 }
1313 }
1314 return ifp != NULL;
1315}
1316
52eeeb84
YH		 1317int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1318{
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
1328 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338}
1339
1340EXPORT_SYMBOL(ipv6_chk_prefix);
1341
9acd9f3a 1342struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1343 struct net_device *dev, int strict)
1da177e4
LT		 1344{
1345 struct inet6_ifaddr * ifp;
1346 u8 hash = ipv6_addr_hash(addr);
1347
1348 read_lock_bh(&addrconf_hash_lock);
1349 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1350 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1351 continue;
1da177e4
LT		 1352 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353 if (dev == NULL || ifp->idev->dev == dev ||
1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1355 in6_ifa_hold(ifp);
1356 break;
1357 }
1358 }
1359 }
1360 read_unlock_bh(&addrconf_hash_lock);
1361
1362 return ifp;
1363}
1364
1da177e4
LT		 1365/* Gets referenced address, destroys ifaddr */
1366
cc411d0b 1367static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1368{
1da177e4
LT		 1369 if (ifp->flags&IFA_F_PERMANENT) {
1370 spin_lock_bh(&ifp->lock);
1371 addrconf_del_timer(ifp);
1372 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1373 if (dad_failed)
1374 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1375 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1376 if (dad_failed)
1377 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1378 in6_ifa_put(ifp);
1379#ifdef CONFIG_IPV6_PRIVACY
1380 } else if (ifp->flags&IFA_F_TEMPORARY) {
1381 struct inet6_ifaddr *ifpub;
1382 spin_lock_bh(&ifp->lock);
1383 ifpub = ifp->ifpub;
1384 if (ifpub) {
1385 in6_ifa_hold(ifpub);
1386 spin_unlock_bh(&ifp->lock);
1387 ipv6_create_tempaddr(ifpub, ifp);
1388 in6_ifa_put(ifpub);
1389 } else {
1390 spin_unlock_bh(&ifp->lock);
1391 }
1392 ipv6_del_addr(ifp);
1393#endif
1394 } else
1395 ipv6_del_addr(ifp);
1396}
1397
3c21edbd
YH		 1398void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1399{
1b34be74 1400 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1401
1402 if (net_ratelimit())
0522fea6
JR		 1403 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1404 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1405
1b34be74
YH		 1406 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1407 struct in6_addr addr;
1408
1409 addr.s6_addr32[0] = htonl(0xfe800000);
1410 addr.s6_addr32[1] = 0;
1411
1412 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1413 ipv6_addr_equal(&ifp->addr, &addr)) {
1414 /* DAD failed for link-local based on MAC address */
1415 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1416
1417 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1418 ifp->idev->dev->name);
1b34be74
YH		 1419 }
1420 }
1421
cc411d0b 1422 addrconf_dad_stop(ifp, 1);
3c21edbd 1423}
1da177e4
LT		 1424
1425/* Join to solicited addr multicast group. */
1426
1427void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1428{
1429 struct in6_addr maddr;
1430
1431 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1432 return;
1433
1434 addrconf_addr_solict_mult(addr, &maddr);
1435 ipv6_dev_mc_inc(dev, &maddr);
1436}
1437
1438void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1439{
1440 struct in6_addr maddr;
1441
1442 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1443 return;
1444
1445 addrconf_addr_solict_mult(addr, &maddr);
1446 __ipv6_dev_mc_dec(idev, &maddr);
1447}
1448
20380731 1449static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1450{
1451 struct in6_addr addr;
1452 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1453 if (ipv6_addr_any(&addr))
1454 return;
1455 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1456}
1457
20380731 1458static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1459{
1460 struct in6_addr addr;
1461 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1462 if (ipv6_addr_any(&addr))
1463 return;
1464 __ipv6_dev_ac_dec(ifp->idev, &addr);
1465}
1466
073a8e0e
YH		 1467static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1468{
1469 if (dev->addr_len != ETH_ALEN)
1470 return -1;
1471 memcpy(eui, dev->dev_addr, 3);
1472 memcpy(eui + 5, dev->dev_addr + 3, 3);
1473
1474 /*
1475 * The zSeries OSA network cards can be shared among various
1476 * OS instances, but the OSA cards have only one MAC address.
1477 * This leads to duplicate address conflicts in conjunction
1478 * with IPv6 if more than one instance uses the same card.
1479 *
1480 * The driver for these cards can deliver a unique 16-bit
1481 * identifier for each instance sharing the same card. It is
1482 * placed instead of 0xFFFE in the interface identifier. The
1483 * "u" bit of the interface identifier is not inverted in this
1484 * case. Hence the resulting interface identifier has local
1485 * scope according to RFC2373.
1486 */
1487 if (dev->dev_id) {
1488 eui[3] = (dev->dev_id >> 8) & 0xFF;
1489 eui[4] = dev->dev_id & 0xFF;
1490 } else {
1491 eui[3] = 0xFF;
1492 eui[4] = 0xFE;
1493 eui[0] ^= 2;
1494 }
1495 return 0;
1496}
1497
1498static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1499{
1500 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1501 if (dev->addr_len != ARCNET_ALEN)
1502 return -1;
1503 memset(eui, 0, 7);
1504 eui[7] = *(u8*)dev->dev_addr;
1505 return 0;
1506}
1507
1508static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1509{
1510 if (dev->addr_len != INFINIBAND_ALEN)
1511 return -1;
1512 memcpy(eui, dev->dev_addr + 12, 8);
1513 eui[0] |= 2;
1514 return 0;
1515}
1516
dfd982ba
YH		 1517int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1518{
9af28511
SH		 1519 if (addr == 0)
1520 return -1;
dfd982ba
YH		 1521 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1522 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1523 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1524 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1525 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1526 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1527 eui[1] = 0;
1528 eui[2] = 0x5E;
1529 eui[3] = 0xFE;
1530 memcpy(eui + 4, &addr, 4);
1531 return 0;
1532}
1533EXPORT_SYMBOL(__ipv6_isatap_ifid);
1534
1535static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1536{
1537 if (dev->priv_flags & IFF_ISATAP)
1538 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1539 return -1;
1540}
1541
1da177e4
LT		 1542static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1543{
1544 switch (dev->type) {
1545 case ARPHRD_ETHER:
1546 case ARPHRD_FDDI:
1547 case ARPHRD_IEEE802_TR:
073a8e0e 1548 return addrconf_ifid_eui48(eui, dev);
1da177e4 1549 case ARPHRD_ARCNET:
073a8e0e 1550 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1551 case ARPHRD_INFINIBAND:
073a8e0e 1552 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1553 case ARPHRD_SIT:
dfd982ba 1554 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1555 }
1556 return -1;
1557}
1558
1559static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1560{
1561 int err = -1;
1562 struct inet6_ifaddr *ifp;
1563
1564 read_lock_bh(&idev->lock);
1565 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1566 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1567 memcpy(eui, ifp->addr.s6_addr+8, 8);
1568 err = 0;
1569 break;
1570 }
1571 }
1572 read_unlock_bh(&idev->lock);
1573 return err;
1574}
1575
1576#ifdef CONFIG_IPV6_PRIVACY
1577/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1578static int __ipv6_regen_rndid(struct inet6_dev *idev)
1579{
1da177e4 1580regen:
955189ef 1581 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1582 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1583
1584 /*
1585 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1586 * check if generated address is not inappropriate
1587 *
1588 * - Reserved subnet anycast (RFC 2526)
1589 * 11111101 11....11 1xxxxxxx
c7dc89c0 1590 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1591 * 00-00-5E-FE-xx-xx-xx-xx
1592 * - value 0
1593 * - XXX: already assigned to an address on the device
1594 */
1ab1457c 1595 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1596 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1597 (idev->rndid[7]&0x80))
1598 goto regen;
1599 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1600 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1601 goto regen;
1602 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1603 goto regen;
1604 }
1605
1606 return 0;
1607}
1608
1609static void ipv6_regen_rndid(unsigned long data)
1610{
1611 struct inet6_dev *idev = (struct inet6_dev *) data;
1612 unsigned long expires;
1613
8814c4b5 1614 rcu_read_lock_bh();
1da177e4
LT		 1615 write_lock_bh(&idev->lock);
1616
1617 if (idev->dead)
1618 goto out;
1619
1620 if (__ipv6_regen_rndid(idev) < 0)
1621 goto out;
1ab1457c 1622
1da177e4 1623 expires = jiffies +
1ab1457c 1624 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1625 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1626 if (time_before(expires, jiffies)) {
1627 printk(KERN_WARNING
1628 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1629 idev->dev->name);
1630 goto out;
1631 }
1632
1633 if (!mod_timer(&idev->regen_timer, expires))
1634 in6_dev_hold(idev);
1635
1636out:
1637 write_unlock_bh(&idev->lock);
8814c4b5 1638 rcu_read_unlock_bh();
1da177e4
LT		 1639 in6_dev_put(idev);
1640}
1641
1642static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1643 int ret = 0;
1644
1645 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1646 ret = __ipv6_regen_rndid(idev);
1647 return ret;
1648}
1649#endif
1650
1651/*
1652 * Add prefix route.
1653 */
1654
1655static void
1656addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1657 unsigned long expires, u32 flags)
1da177e4 1658{
86872cb5
TG		 1659 struct fib6_config cfg = {
1660 .fc_table = RT6_TABLE_PREFIX,
1661 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1662 .fc_ifindex = dev->ifindex,
1663 .fc_expires = expires,
1664 .fc_dst_len = plen,
1665 .fc_flags = RTF_UP | flags,
c346dca1 1666 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1667 .fc_protocol = RTPROT_KERNEL,
86872cb5 1668 };
1da177e4 1669
86872cb5 1670 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1671
1672 /* Prevent useless cloning on PtP SIT.
1673 This thing is done here expecting that the whole
1674 class of non-broadcast devices need not cloning.
1675 */
0be669bb 1676#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1677 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1678 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1679#endif
1da177e4 1680
86872cb5 1681 ip6_route_add(&cfg);
1da177e4
LT		 1682}
1683
1684/* Create "default" multicast route to the interface */
1685
1686static void addrconf_add_mroute(struct net_device *dev)
1687{
86872cb5
TG		 1688 struct fib6_config cfg = {
1689 .fc_table = RT6_TABLE_LOCAL,
1690 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1691 .fc_ifindex = dev->ifindex,
1692 .fc_dst_len = 8,
1693 .fc_flags = RTF_UP,
c346dca1 1694 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1695 };
1696
1697 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1698
1699 ip6_route_add(&cfg);
1da177e4
LT		 1700}
1701
0be669bb 1702#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1703static void sit_route_add(struct net_device *dev)
1704{
86872cb5
TG		 1705 struct fib6_config cfg = {
1706 .fc_table = RT6_TABLE_MAIN,
1707 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1708 .fc_ifindex = dev->ifindex,
1709 .fc_dst_len = 96,
1710 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1711 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1712 };
1da177e4
LT		 1713
1714 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1715 ip6_route_add(&cfg);
1da177e4 1716}
0be669bb 1717#endif
1da177e4
LT		 1718
1719static void addrconf_add_lroute(struct net_device *dev)
1720{
1721 struct in6_addr addr;
1722
1723 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1724 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1725}
1726
1727static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1728{
1729 struct inet6_dev *idev;
1730
1731 ASSERT_RTNL();
1732
1733 if ((idev = ipv6_find_idev(dev)) == NULL)
1734 return NULL;
1735
1736 /* Add default multicast route */
1737 addrconf_add_mroute(dev);
1738
1739 /* Add link local route */
1740 addrconf_add_lroute(dev);
1741 return idev;
1742}
1743
1744void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1745{
1746 struct prefix_info *pinfo;
1747 __u32 valid_lft;
1748 __u32 prefered_lft;
1749 int addr_type;
1da177e4 1750 struct inet6_dev *in6_dev;
56d417b1 1751 struct net *net = dev_net(dev);
1da177e4
LT		 1752
1753 pinfo = (struct prefix_info *) opt;
1ab1457c 1754
1da177e4
LT		 1755 if (len < sizeof(struct prefix_info)) {
1756 ADBG(("addrconf: prefix option too short\n"));
1757 return;
1758 }
1ab1457c 1759
1da177e4
LT		 1760 /*
1761 * Validation checks ([ADDRCONF], page 19)
1762 */
1763
1764 addr_type = ipv6_addr_type(&pinfo->prefix);
1765
1766 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1767 return;
1768
1769 valid_lft = ntohl(pinfo->valid);
1770 prefered_lft = ntohl(pinfo->prefered);
1771
1772 if (prefered_lft > valid_lft) {
1773 if (net_ratelimit())
1774 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1775 return;
1776 }
1777
1778 in6_dev = in6_dev_get(dev);
1779
1780 if (in6_dev == NULL) {
1781 if (net_ratelimit())
1782 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1783 return;
1784 }
1785
1786 /*
1787 * Two things going on here:
1788 * 1) Add routes for on-link prefixes
1789 * 2) Configure prefixes with the auto flag set
1790 */
1791
4bed72e4
YH		 1792 if (pinfo->onlink) {
1793 struct rt6_info *rt;
1794 unsigned long rt_expires;
1795
6f704992
YH		 1796 /* Avoid arithmetic overflow. Really, we could
1797 * save rt_expires in seconds, likely valid_lft,
1798 * but it would require division in fib gc, that it
1799 * not good.
1800 */
4bed72e4
YH		 1801 if (HZ > USER_HZ)
1802 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1803 else
1804 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1805
4bed72e4
YH		 1806 if (addrconf_finite_timeout(rt_expires))
1807 rt_expires *= HZ;
1da177e4 1808
56d417b1 1809 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1810 dev->ifindex, 1);
1da177e4 1811
2b5ead46 1812 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1813 /* Autoconf prefix route */
1814 if (valid_lft == 0) {
1815 ip6_del_rt(rt);
1816 rt = NULL;
4bed72e4 1817 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1818 /* not infinity */
1819 rt->rt6i_expires = jiffies + rt_expires;
1820 rt->rt6i_flags |= RTF_EXPIRES;
1821 } else {
1822 rt->rt6i_flags &= ~RTF_EXPIRES;
1823 rt->rt6i_expires = 0;
1da177e4
LT		 1824 }
1825 } else if (valid_lft) {
6f704992 1826 clock_t expires = 0;
4bed72e4
YH		 1827 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1828 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1829 /* not infinity */
1830 flags |= RTF_EXPIRES;
1831 expires = jiffies_to_clock_t(rt_expires);
1832 }
1da177e4 1833 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1834 dev, expires, flags);
1da177e4
LT		 1835 }
1836 if (rt)
1837 dst_release(&rt->u.dst);
1838 }
1839
1840 /* Try to figure out our local address for this prefix */
1841
1842 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1843 struct inet6_ifaddr * ifp;
1844 struct in6_addr addr;
1845 int create = 0, update_lft = 0;
1846
1847 if (pinfo->prefix_len == 64) {
1848 memcpy(&addr, &pinfo->prefix, 8);
1849 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1850 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1851 in6_dev_put(in6_dev);
1852 return;
1853 }
1854 goto ok;
1855 }
1856 if (net_ratelimit())
1857 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1858 pinfo->prefix_len);
1859 in6_dev_put(in6_dev);
1860 return;
1861
1862ok:
1863
53b7997f 1864 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1865
1866 if (ifp == NULL && valid_lft) {
1867 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1868 u32 addr_flags = 0;
1869
1870#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1871 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1872 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1873 addr_flags = IFA_F_OPTIMISTIC;
1874#endif
1da177e4
LT		 1875
1876 /* Do not allow to create too much of autoconfigured
1877 * addresses; this would be too easy way to crash kernel.
1878 */
1879 if (!max_addresses ||
1880 ipv6_count_addresses(in6_dev) < max_addresses)
1881 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1882 addr_type&IPV6_ADDR_SCOPE_MASK,
1883 addr_flags);
1da177e4
LT		 1884
1885 if (!ifp || IS_ERR(ifp)) {
1886 in6_dev_put(in6_dev);
1887 return;
1888 }
1889
1890 update_lft = create = 1;
1891 ifp->cstamp = jiffies;
1892 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1893 }
1894
1895 if (ifp) {
1896 int flags;
1897 unsigned long now;
1898#ifdef CONFIG_IPV6_PRIVACY
1899 struct inet6_ifaddr *ift;
1900#endif
1901 u32 stored_lft;
1902
1903 /* update lifetime (RFC2462 5.5.3 e) */
1904 spin_lock(&ifp->lock);
1905 now = jiffies;
1906 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1907 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1908 else
1909 stored_lft = 0;
1910 if (!update_lft && stored_lft) {
1911 if (valid_lft > MIN_VALID_LIFETIME ||
1912 valid_lft > stored_lft)
1913 update_lft = 1;
1914 else if (stored_lft <= MIN_VALID_LIFETIME) {
1915 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1916 /*
1917 * RFC 4862 Section 5.5.3e:
1918 * "Note that the preferred lifetime of
1919 * the corresponding address is always
1920 * reset to the Preferred Lifetime in
1921 * the received Prefix Information
1922 * option, regardless of whether the
1923 * valid lifetime is also reset or
1924 * ignored."
1925 *
1926 * So if the preferred lifetime in
1927 * this advertisement is different
1928 * than what we have stored, but the
1929 * valid lifetime is invalid, just
1930 * reset prefered_lft.
1931 *
1932 * We must set the valid lifetime
1933 * to the stored lifetime since we'll
1934 * be updating the timestamp below,
1935 * else we'll set it back to the
1936 * minumum.
1937 */
1938 if (prefered_lft != ifp->prefered_lft) {
1939 valid_lft = stored_lft;
1940 update_lft = 1;
1941 }
1da177e4
LT		 1942 } else {
1943 valid_lft = MIN_VALID_LIFETIME;
1944 if (valid_lft < prefered_lft)
1945 prefered_lft = valid_lft;
1946 update_lft = 1;
1947 }
1948 }
1949
1950 if (update_lft) {
1951 ifp->valid_lft = valid_lft;
1952 ifp->prefered_lft = prefered_lft;
1953 ifp->tstamp = now;
1954 flags = ifp->flags;
1955 ifp->flags &= ~IFA_F_DEPRECATED;
1956 spin_unlock(&ifp->lock);
1957
1958 if (!(flags&IFA_F_TENTATIVE))
1959 ipv6_ifa_notify(0, ifp);
1960 } else
1961 spin_unlock(&ifp->lock);
1962
1963#ifdef CONFIG_IPV6_PRIVACY
1964 read_lock_bh(&in6_dev->lock);
1965 /* update all temporary addresses in the list */
372e6c8f 1966 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1967 /*
1968 * When adjusting the lifetimes of an existing
1969 * temporary address, only lower the lifetimes.
1970 * Implementations must not increase the
1971 * lifetimes of an existing temporary address
1972 * when processing a Prefix Information Option.
1973 */
c6fbfac2
BB		 1974 if (ifp != ift->ifpub)
1975 continue;
1976
1da177e4
LT		 1977 spin_lock(&ift->lock);
1978 flags = ift->flags;
1979 if (ift->valid_lft > valid_lft &&
1980 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1981 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1982 if (ift->prefered_lft > prefered_lft &&
1983 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1985 spin_unlock(&ift->lock);
1986 if (!(flags&IFA_F_TENTATIVE))
1987 ipv6_ifa_notify(0, ift);
1988 }
1989
1990 if (create && in6_dev->cnf.use_tempaddr > 0) {
1991 /*
1992 * When a new public address is created as described in [ADDRCONF],
1993 * also create a new temporary address.
1994 */
1ab1457c 1995 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1996 ipv6_create_tempaddr(ifp, NULL);
1997 } else {
1998 read_unlock_bh(&in6_dev->lock);
1999 }
2000#endif
2001 in6_ifa_put(ifp);
2002 addrconf_verify(0);
2003 }
2004 }
2005 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2006 in6_dev_put(in6_dev);
2007}
2008
2009/*
2010 * Set destination address.
2011 * Special case for SIT interfaces where we create a new "virtual"
2012 * device.
2013 */
af284937 2014int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2015{
2016 struct in6_ifreq ireq;
2017 struct net_device *dev;
2018 int err = -EINVAL;
2019
2020 rtnl_lock();
2021
2022 err = -EFAULT;
2023 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024 goto err_exit;
2025
af284937 2026 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2027
2028 err = -ENODEV;
2029 if (dev == NULL)
2030 goto err_exit;
2031
0be669bb 2032#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2033 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2034 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2035 struct ifreq ifr;
1da177e4
LT		 2036 struct ip_tunnel_parm p;
2037
2038 err = -EADDRNOTAVAIL;
2039 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2040 goto err_exit;
2041
2042 memset(&p, 0, sizeof(p));
2043 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2044 p.iph.saddr = 0;
2045 p.iph.version = 4;
2046 p.iph.ihl = 5;
2047 p.iph.protocol = IPPROTO_IPV6;
2048 p.iph.ttl = 64;
d20b3109 2049 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2050
5bc3eb7e
SH		 2051 if (ops->ndo_do_ioctl) {
2052 mm_segment_t oldfs = get_fs();
2053
2054 set_fs(KERNEL_DS);
2055 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2056 set_fs(oldfs);
2057 } else
2058 err = -EOPNOTSUPP;
1da177e4
LT		 2059
2060 if (err == 0) {
2061 err = -ENOBUFS;
af284937
DL		 2062 dev = __dev_get_by_name(net, p.name);
2063 if (!dev)
1da177e4
LT		 2064 goto err_exit;
2065 err = dev_open(dev);
2066 }
2067 }
0be669bb 2068#endif
1da177e4
LT		 2069
2070err_exit:
2071 rtnl_unlock();
2072 return err;
2073}
2074
2075/*
2076 * Manual configuration of address on an interface
2077 */
af284937 2078static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2079 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2080 __u32 valid_lft)
1da177e4
LT		 2081{
2082 struct inet6_ifaddr *ifp;
2083 struct inet6_dev *idev;
2084 struct net_device *dev;
2085 int scope;
6f704992
YH		 2086 u32 flags;
2087 clock_t expires;
4bed72e4 2088 unsigned long timeout;
1da177e4
LT		 2089
2090 ASSERT_RTNL();
1ab1457c 2091
24ef0da7
TG		 2092 if (plen > 128)
2093 return -EINVAL;
2094
0778769d
NT		 2095 /* check the lifetime */
2096 if (!valid_lft || prefered_lft > valid_lft)
2097 return -EINVAL;
2098
af284937
DL		 2099 dev = __dev_get_by_index(net, ifindex);
2100 if (!dev)
1da177e4 2101 return -ENODEV;
1ab1457c 2102
1da177e4
LT		 2103 if ((idev = addrconf_add_dev(dev)) == NULL)
2104 return -ENOBUFS;
2105
2106 scope = ipv6_addr_scope(pfx);
2107
4bed72e4
YH		 2108 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2109 if (addrconf_finite_timeout(timeout)) {
2110 expires = jiffies_to_clock_t(timeout * HZ);
2111 valid_lft = timeout;
6f704992 2112 flags = RTF_EXPIRES;
4bed72e4
YH		 2113 } else {
2114 expires = 0;
2115 flags = 0;
2116 ifa_flags |= IFA_F_PERMANENT;
6f704992 2117 }
0778769d 2118
4bed72e4
YH		 2119 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2120 if (addrconf_finite_timeout(timeout)) {
2121 if (timeout == 0)
2122 ifa_flags |= IFA_F_DEPRECATED;
2123 prefered_lft = timeout;
2124 }
0778769d
NT		 2125
2126 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2127
1da177e4 2128 if (!IS_ERR(ifp)) {
06aebfb7 2129 spin_lock_bh(&ifp->lock);
0778769d
NT		 2130 ifp->valid_lft = valid_lft;
2131 ifp->prefered_lft = prefered_lft;
2132 ifp->tstamp = jiffies;
06aebfb7 2133 spin_unlock_bh(&ifp->lock);
0778769d 2134
46d48046 2135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2136 expires, flags);
95c385b4
NH		 2137 /*
2138 * Note that section 3.1 of RFC 4429 indicates
2139 * that the Optimistic flag should not be set for
2140 * manually configured addresses
2141 */
1da177e4
LT		 2142 addrconf_dad_start(ifp, 0);
2143 in6_ifa_put(ifp);
0778769d 2144 addrconf_verify(0);
1da177e4
LT		 2145 return 0;
2146 }
2147
2148 return PTR_ERR(ifp);
2149}
2150
af284937 2151static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2152 unsigned int plen)
1da177e4
LT		 2153{
2154 struct inet6_ifaddr *ifp;
2155 struct inet6_dev *idev;
2156 struct net_device *dev;
1ab1457c 2157
24ef0da7
TG		 2158 if (plen > 128)
2159 return -EINVAL;
2160
af284937
DL		 2161 dev = __dev_get_by_index(net, ifindex);
2162 if (!dev)
1da177e4
LT		 2163 return -ENODEV;
2164
2165 if ((idev = __in6_dev_get(dev)) == NULL)
2166 return -ENXIO;
2167
2168 read_lock_bh(&idev->lock);
2169 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2170 if (ifp->prefix_len == plen &&
2171 ipv6_addr_equal(pfx, &ifp->addr)) {
2172 in6_ifa_hold(ifp);
2173 read_unlock_bh(&idev->lock);
1ab1457c 2174
1da177e4
LT		 2175 ipv6_del_addr(ifp);
2176
2177 /* If the last address is deleted administratively,
2178 disable IPv6 on this interface.
2179 */
2180 if (idev->addr_list == NULL)
2181 addrconf_ifdown(idev->dev, 1);
2182 return 0;
2183 }
2184 }
2185 read_unlock_bh(&idev->lock);
2186 return -EADDRNOTAVAIL;
2187}
2188
2189
af284937 2190int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2191{
2192 struct in6_ifreq ireq;
2193 int err;
1ab1457c 2194
1da177e4
LT		 2195 if (!capable(CAP_NET_ADMIN))
2196 return -EPERM;
1ab1457c 2197
1da177e4
LT		 2198 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2199 return -EFAULT;
2200
2201 rtnl_lock();
af284937
DL		 2202 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2203 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2204 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2205 rtnl_unlock();
2206 return err;
2207}
2208
af284937 2209int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2210{
2211 struct in6_ifreq ireq;
2212 int err;
1ab1457c 2213
1da177e4
LT		 2214 if (!capable(CAP_NET_ADMIN))
2215 return -EPERM;
2216
2217 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2218 return -EFAULT;
2219
2220 rtnl_lock();
af284937
DL		 2221 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2222 ireq.ifr6_prefixlen);
1da177e4
LT		 2223 rtnl_unlock();
2224 return err;
2225}
2226
b5f348e5
IJ		 2227static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2228 int plen, int scope)
2229{
2230 struct inet6_ifaddr *ifp;
2231
2232 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2233 if (!IS_ERR(ifp)) {
2234 spin_lock_bh(&ifp->lock);
2235 ifp->flags &= ~IFA_F_TENTATIVE;
2236 spin_unlock_bh(&ifp->lock);
2237 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2238 in6_ifa_put(ifp);
2239 }
2240}
2241
0be669bb 2242#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2243static void sit_add_v4_addrs(struct inet6_dev *idev)
2244{
1da177e4
LT		 2245 struct in6_addr addr;
2246 struct net_device *dev;
c346dca1 2247 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2248 int scope;
2249
2250 ASSERT_RTNL();
2251
2252 memset(&addr, 0, sizeof(struct in6_addr));
2253 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2254
2255 if (idev->dev->flags&IFF_POINTOPOINT) {
2256 addr.s6_addr32[0] = htonl(0xfe800000);
2257 scope = IFA_LINK;
2258 } else {
2259 scope = IPV6_ADDR_COMPATv4;
2260 }
2261
2262 if (addr.s6_addr32[3]) {
b5f348e5 2263 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2264 return;
2265 }
2266
6fda7350 2267 for_each_netdev(net, dev) {
e5ed6399 2268 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2269 if (in_dev && (dev->flags & IFF_UP)) {
2270 struct in_ifaddr * ifa;
2271
2272 int flag = scope;
2273
2274 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2275 int plen;
2276
2277 addr.s6_addr32[3] = ifa->ifa_local;
2278
2279 if (ifa->ifa_scope == RT_SCOPE_LINK)
2280 continue;
2281 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2282 if (idev->dev->flags&IFF_POINTOPOINT)
2283 continue;
2284 flag |= IFA_HOST;
2285 }
2286 if (idev->dev->flags&IFF_POINTOPOINT)
2287 plen = 64;
2288 else
2289 plen = 96;
2290
b5f348e5 2291 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2292 }
2293 }
1ab1457c 2294 }
1da177e4 2295}
0be669bb 2296#endif
1da177e4
LT		 2297
2298static void init_loopback(struct net_device *dev)
2299{
2300 struct inet6_dev *idev;
1da177e4
LT		 2301
2302 /* ::1 */
2303
2304 ASSERT_RTNL();
2305
2306 if ((idev = ipv6_find_idev(dev)) == NULL) {
2307 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2308 return;
2309 }
2310
b5f348e5 2311 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2312}
2313
2314static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2315{
2316 struct inet6_ifaddr * ifp;
95c385b4
NH		 2317 u32 addr_flags = IFA_F_PERMANENT;
2318
2319#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2320 if (idev->cnf.optimistic_dad &&
702beb87 2321 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2322 addr_flags |= IFA_F_OPTIMISTIC;
2323#endif
1da177e4 2324
95c385b4
NH		 2325
2326 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2327 if (!IS_ERR(ifp)) {
46d48046 2328 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2329 addrconf_dad_start(ifp, 0);
2330 in6_ifa_put(ifp);
2331 }
2332}
2333
2334static void addrconf_dev_config(struct net_device *dev)
2335{
2336 struct in6_addr addr;
2337 struct inet6_dev * idev;
2338
2339 ASSERT_RTNL();
2340
74235a25
HX		 2341 if ((dev->type != ARPHRD_ETHER) &&
2342 (dev->type != ARPHRD_FDDI) &&
2343 (dev->type != ARPHRD_IEEE802_TR) &&
2344 (dev->type != ARPHRD_ARCNET) &&
2345 (dev->type != ARPHRD_INFINIBAND)) {
2346 /* Alas, we support only Ethernet autoconfiguration. */
2347 return;
2348 }
2349
1da177e4
LT		 2350 idev = addrconf_add_dev(dev);
2351 if (idev == NULL)
2352 return;
2353
2354 memset(&addr, 0, sizeof(struct in6_addr));
2355 addr.s6_addr32[0] = htonl(0xFE800000);
2356
2357 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2358 addrconf_add_linklocal(idev, &addr);
2359}
2360
0be669bb 2361#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2362static void addrconf_sit_config(struct net_device *dev)
2363{
2364 struct inet6_dev *idev;
2365
2366 ASSERT_RTNL();
2367
1ab1457c
YH		 2368 /*
2369 * Configure the tunnel with one of our IPv4
2370 * addresses... we should configure all of
1da177e4
LT		 2371 * our v4 addrs in the tunnel
2372 */
2373
2374 if ((idev = ipv6_find_idev(dev)) == NULL) {
2375 printk(KERN_DEBUG "init sit: add_dev failed\n");
2376 return;
2377 }
2378
c7dc89c0
FT		 2379 if (dev->priv_flags & IFF_ISATAP) {
2380 struct in6_addr addr;
2381
2382 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2383 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2384 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2385 addrconf_add_linklocal(idev, &addr);
2386 return;
2387 }
2388
1da177e4
LT		 2389 sit_add_v4_addrs(idev);
2390
2391 if (dev->flags&IFF_POINTOPOINT) {
2392 addrconf_add_mroute(dev);
2393 addrconf_add_lroute(dev);
2394 } else
2395 sit_route_add(dev);
2396}
0be669bb 2397#endif
1da177e4
LT		 2398
2399static inline int
2400ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2401{
2402 struct in6_addr lladdr;
2403
95c385b4 2404 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2405 addrconf_add_linklocal(idev, &lladdr);
2406 return 0;
2407 }
2408 return -1;
2409}
2410
2411static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2412{
2413 struct net_device *link_dev;
c346dca1 2414 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2415
2416 /* first try to inherit the link-local address from the link device */
2417 if (idev->dev->iflink &&
6fda7350 2418 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2419 if (!ipv6_inherit_linklocal(idev, link_dev))
2420 return;
2421 }
2422 /* then try to inherit it from any device */
6fda7350 2423 for_each_netdev(net, link_dev) {
1da177e4
LT		 2424 if (!ipv6_inherit_linklocal(idev, link_dev))
2425 return;
2426 }
2427 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2428}
2429
2430/*
2431 * Autoconfigure tunnel with a link-local address so routing protocols,
2432 * DHCPv6, MLD etc. can be run over the virtual link
2433 */
2434
2435static void addrconf_ip6_tnl_config(struct net_device *dev)
2436{
2437 struct inet6_dev *idev;
2438
2439 ASSERT_RTNL();
2440
2441 if ((idev = addrconf_add_dev(dev)) == NULL) {
2442 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2443 return;
2444 }
2445 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2446}
2447
1ab1457c 2448static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2449 void * data)
2450{
2451 struct net_device *dev = (struct net_device *) data;
74235a25 2452 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2453 int run_pending = 0;
b217d616 2454 int err;
1da177e4
LT		 2455
2456 switch(event) {
45ba9dd2 2457 case NETDEV_REGISTER:
74235a25 2458 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2459 idev = ipv6_add_dev(dev);
2460 if (!idev)
b217d616 2461 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2462 }
2463 break;
1da177e4 2464 case NETDEV_UP:
3c21edbd 2465 case NETDEV_CHANGE:
c2edacf8
JV		 2466 if (dev->flags & IFF_SLAVE)
2467 break;
2468
3c21edbd 2469 if (event == NETDEV_UP) {
f24e3d65 2470 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2471 /* device is not ready yet. */
2472 printk(KERN_INFO
2473 "ADDRCONF(NETDEV_UP): %s: "
2474 "link is not ready\n",
2475 dev->name);
2476 break;
2477 }
99081049 2478
d31c7b8f
EP		 2479 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2480 idev = ipv6_add_dev(dev);
2481
e3ec6cfc 2482 if (idev) {
99081049 2483 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2484 run_pending = 1;
2485 }
3c21edbd 2486 } else {
f24e3d65 2487 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2488 /* device is still not ready. */
2489 break;
2490 }
2491
2492 if (idev) {
2493 if (idev->if_flags & IF_READY) {
2494 /* device is already configured. */
2495 break;
2496 }
2497 idev->if_flags |= IF_READY;
2498 }
2499
2500 printk(KERN_INFO
2501 "ADDRCONF(NETDEV_CHANGE): %s: "
2502 "link becomes ready\n",
2503 dev->name);
2504
c5e33bdd 2505 run_pending = 1;
3c21edbd
YH		 2506 }
2507
1da177e4 2508 switch(dev->type) {
0be669bb 2509#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2510 case ARPHRD_SIT:
2511 addrconf_sit_config(dev);
2512 break;
0be669bb 2513#endif
1da177e4
LT		 2514 case ARPHRD_TUNNEL6:
2515 addrconf_ip6_tnl_config(dev);
2516 break;
2517 case ARPHRD_LOOPBACK:
2518 init_loopback(dev);
2519 break;
2520
2521 default:
2522 addrconf_dev_config(dev);
2523 break;
3ff50b79 2524 }
1da177e4 2525 if (idev) {
c5e33bdd
YH		 2526 if (run_pending)
2527 addrconf_dad_run(idev);
2528
1da177e4
LT		 2529 /* If the MTU changed during the interface down, when the
2530 interface up, the changed MTU must be reflected in the
2531 idev as well as routers.
2532 */
2533 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2534 rt6_mtu_change(dev, dev->mtu);
2535 idev->cnf.mtu6 = dev->mtu;
2536 }
2537 idev->tstamp = jiffies;
2538 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2539 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2540 stop IPv6 on this interface.
2541 */
2542 if (dev->mtu < IPV6_MIN_MTU)
2543 addrconf_ifdown(dev, event != NETDEV_DOWN);
2544 }
2545 break;
2546
2547 case NETDEV_CHANGEMTU:
d31c7b8f 2548 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2549 rt6_mtu_change(dev, dev->mtu);
2550 idev->cnf.mtu6 = dev->mtu;
2551 break;
2552 }
2553
d31c7b8f
EP		 2554 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2555 idev = ipv6_add_dev(dev);
2556 if (idev)
2557 break;
2558 }
2559
1da177e4
LT		 2560 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2561
2562 case NETDEV_DOWN:
2563 case NETDEV_UNREGISTER:
2564 /*
2565 * Remove all addresses from this interface.
2566 */
2567 addrconf_ifdown(dev, event != NETDEV_DOWN);
2568 break;
3c21edbd 2569
1da177e4 2570 case NETDEV_CHANGENAME:
1da177e4 2571 if (idev) {
5632c515 2572 snmp6_unregister_dev(idev);
408c4768 2573 addrconf_sysctl_unregister(idev);
f52295a9 2574 addrconf_sysctl_register(idev);
b217d616
HX		 2575 err = snmp6_register_dev(idev);
2576 if (err)
2577 return notifier_from_errno(err);
5632c515 2578 }
1da177e4 2579 break;
93d9b7d7
JP		 2580 case NETDEV_PRE_TYPE_CHANGE:
2581 case NETDEV_POST_TYPE_CHANGE:
2582 addrconf_type_change(dev, event);
75c78500 2583 break;
3ff50b79 2584 }
1da177e4
LT		 2585
2586 return NOTIFY_OK;
2587}
2588
2589/*
2590 * addrconf module should be notified of a device going up
2591 */
2592static struct notifier_block ipv6_dev_notf = {
2593 .notifier_call = addrconf_notify,
2594 .priority = 0
2595};
2596
93d9b7d7 2597static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2598{
2599 struct inet6_dev *idev;
2600 ASSERT_RTNL();
2601
2602 idev = __in6_dev_get(dev);
2603
93d9b7d7 2604 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2605 ipv6_mc_remap(idev);
93d9b7d7 2606 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2607 ipv6_mc_unmap(idev);
2608}
2609
1da177e4
LT		 2610static int addrconf_ifdown(struct net_device *dev, int how)
2611{
2612 struct inet6_dev *idev;
8f37ada5 2613 struct inet6_ifaddr *ifa, *keep_list, **bifa;
c346dca1 2614 struct net *net = dev_net(dev);
1da177e4
LT		 2615 int i;
2616
2617 ASSERT_RTNL();
2618
f3db4851 2619 rt6_ifdown(net, dev);
1da177e4
LT		 2620 neigh_ifdown(&nd_tbl, dev);
2621
2622 idev = __in6_dev_get(dev);
2623 if (idev == NULL)
2624 return -ENODEV;
2625
2626 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2627 Do not dev_put!
1da177e4 2628 */
439e2385 2629 if (how) {
1da177e4 2630 idev->dead = 1;
8814c4b5
YH		 2631
2632 /* protected by rtnl_lock */
2633 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2634
2635 /* Step 1.5: remove snmp6 entry */
2636 snmp6_unregister_dev(idev);
2637
2638 }
2639
2640 /* Step 2: clear hash table */
2641 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2642 bifa = &inet6_addr_lst[i];
2643
2644 write_lock_bh(&addrconf_hash_lock);
2645 while ((ifa = *bifa) != NULL) {
dc2b99f7 2646 if (ifa->idev == idev &&
84e8b803 2647 (how || !(ifa->flags&IFA_F_PERMANENT) ||
2648 ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2649 *bifa = ifa->lst_next;
2650 ifa->lst_next = NULL;
84e8b803 2651 __in6_ifa_put(ifa);
1da177e4
LT		 2652 continue;
2653 }
2654 bifa = &ifa->lst_next;
2655 }
2656 write_unlock_bh(&addrconf_hash_lock);
2657 }
2658
2659 write_lock_bh(&idev->lock);
2660
2661 /* Step 3: clear flags for stateless addrconf */
439e2385 2662 if (!how)
3c21edbd 2663 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2664
2665 /* Step 4: clear address list */
2666#ifdef CONFIG_IPV6_PRIVACY
439e2385 2667 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2668 in6_dev_put(idev);
2669
2670 /* clear tempaddr list */
372e6c8f 2671 while (!list_empty(&idev->tempaddr_list)) {
2672 ifa = list_first_entry(&idev->tempaddr_list,
2673 struct inet6_ifaddr, tmp_list);
2674 list_del(&ifa->tmp_list);
1da177e4
LT		 2675 ifa->dead = 1;
2676 write_unlock_bh(&idev->lock);
2677 spin_lock_bh(&ifa->lock);
2678
2679 if (ifa->ifpub) {
2680 in6_ifa_put(ifa->ifpub);
2681 ifa->ifpub = NULL;
2682 }
2683 spin_unlock_bh(&ifa->lock);
2684 in6_ifa_put(ifa);
2685 write_lock_bh(&idev->lock);
2686 }
2687#endif
8f37ada5 2688 keep_list = NULL;
2689 bifa = &keep_list;
2690 while ((ifa = idev->addr_list) != NULL) {
2691 idev->addr_list = ifa->if_next;
2692 ifa->if_next = NULL;
2693
84e8b803 2694 addrconf_del_timer(ifa);
2695
2696 /* If just doing link down, and address is permanent
2697 and not link-local, then retain it. */
2698 if (how == 0 &&
2699 (ifa->flags&IFA_F_PERMANENT) &&
2700 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
8f37ada5 2701
2702 /* Move to holding list */
2703 *bifa = ifa;
dc2b99f7 2704 bifa = &ifa->if_next;
2705
84e8b803 2706 /* If not doing DAD on this address, just keep it. */
2707 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2708 idev->cnf.accept_dad <= 0 ||
2709 (ifa->flags & IFA_F_NODAD))
2710 continue;
2711
2712 /* If it was tentative already, no need to notify */
2713 if (ifa->flags & IFA_F_TENTATIVE)
2714 continue;
2715
2716 /* Flag it for later restoration when link comes up */
2717 ifa->flags |= IFA_F_TENTATIVE;
2718 in6_ifa_hold(ifa);
dc2b99f7 2719 } else {
dc2b99f7 2720 ifa->dead = 1;
84e8b803 2721 }
2722 write_unlock_bh(&idev->lock);
1da177e4 2723
84e8b803 2724 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2725 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2726 in6_ifa_put(ifa);
dc2b99f7 2727
84e8b803 2728 write_lock_bh(&idev->lock);
1da177e4 2729 }
8f37ada5 2730
2731 idev->addr_list = keep_list;
2732
1da177e4
LT		 2733 write_unlock_bh(&idev->lock);
2734
2735 /* Step 5: Discard multicast list */
2736
439e2385 2737 if (how)
1da177e4
LT		 2738 ipv6_mc_destroy_dev(idev);
2739 else
2740 ipv6_mc_down(idev);
2741
1da177e4 2742 idev->tstamp = jiffies;
1ab1457c 2743
1da177e4
LT		 2744 /* Shot the device (if unregistered) */
2745
439e2385 2746 if (how) {
408c4768 2747 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2748 neigh_parms_release(&nd_tbl, idev->nd_parms);
2749 neigh_ifdown(&nd_tbl, dev);
2750 in6_dev_put(idev);
2751 }
2752 return 0;
2753}
2754
2755static void addrconf_rs_timer(unsigned long data)
2756{
2757 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2758 struct inet6_dev *idev = ifp->idev;
1da177e4 2759
5b2a1953 2760 read_lock(&idev->lock);
2761 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2762 goto out;
2763
5b2a1953 2764 if (idev->cnf.forwarding)
2765 goto out;
2766
2767 /* Announcement received after solicitation was sent */
2768 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2769 goto out;
1da177e4
LT		 2770
2771 spin_lock(&ifp->lock);
5b2a1953 2772 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2773 /* The wait after the last probe can be shorter */
2774 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2775 (ifp->probes == idev->cnf.rtr_solicits) ?
2776 idev->cnf.rtr_solicit_delay :
2777 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2778 spin_unlock(&ifp->lock);
2779
5b2a1953 2780 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2781 } else {
2782 spin_unlock(&ifp->lock);
2783 /*
2784 * Note: we do not support deprecated "all on-link"
2785 * assumption any longer.
2786 */
2787 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2788 idev->dev->name);
1da177e4
LT		 2789 }
2790
2791out:
5b2a1953 2792 read_unlock(&idev->lock);
1da177e4
LT		 2793 in6_ifa_put(ifp);
2794}
2795
2796/*
2797 * Duplicate Address Detection
2798 */
3c21edbd
YH		 2799static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2800{
2801 unsigned long rand_num;
2802 struct inet6_dev *idev = ifp->idev;
2803
95c385b4
NH		 2804 if (ifp->flags & IFA_F_OPTIMISTIC)
2805 rand_num = 0;
2806 else
2807 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2808
3c21edbd
YH		 2809 ifp->probes = idev->cnf.dad_transmits;
2810 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2811}
2812
e431b8c0 2813static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2814{
2815 struct inet6_dev *idev = ifp->idev;
2816 struct net_device *dev = idev->dev;
1da177e4
LT		 2817
2818 addrconf_join_solict(dev, &ifp->addr);
2819
1da177e4 2820 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2821
2822 read_lock_bh(&idev->lock);
2823 if (ifp->dead)
2824 goto out;
1da177e4 2825
21809faf 2826 spin_lock(&ifp->lock);
1da177e4 2827 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2828 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2829 !(ifp->flags&IFA_F_TENTATIVE) ||
2830 ifp->flags & IFA_F_NODAD) {
cc411d0b 2831 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2832 spin_unlock(&ifp->lock);
1da177e4
LT		 2833 read_unlock_bh(&idev->lock);
2834
2835 addrconf_dad_completed(ifp);
2836 return;
2837 }
2838
6732bade 2839 if (!(idev->if_flags & IF_READY)) {
21809faf 2840 spin_unlock(&ifp->lock);
6732bade 2841 read_unlock_bh(&idev->lock);
3c21edbd 2842 /*
590a9887 2843 * If the device is not ready:
3c21edbd
YH		 2844 * - keep it tentative if it is a permanent address.
2845 * - otherwise, kill it.
2846 */
2847 in6_ifa_hold(ifp);
cc411d0b 2848 addrconf_dad_stop(ifp, 0);
6732bade 2849 return;
3c21edbd 2850 }
95c385b4
NH		 2851
2852 /*
2853 * Optimistic nodes can start receiving
2854 * Frames right away
2855 */
2856 if(ifp->flags & IFA_F_OPTIMISTIC)
2857 ip6_ins_rt(ifp->rt);
2858
6732bade 2859 addrconf_dad_kick(ifp);
21809faf 2860 spin_unlock(&ifp->lock);
1da177e4
LT		 2861out:
2862 read_unlock_bh(&idev->lock);
2863}
2864
2865static void addrconf_dad_timer(unsigned long data)
2866{
2867 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2868 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2869 struct in6_addr mcaddr;
2870
122e4519 2871 read_lock(&idev->lock);
2872 if (idev->dead || !(idev->if_flags & IF_READY)) {
2873 read_unlock(&idev->lock);
1da177e4
LT		 2874 goto out;
2875 }
21809faf 2876
2877 spin_lock(&ifp->lock);
1da177e4
LT		 2878 if (ifp->probes == 0) {
2879 /*
2880 * DAD was successful
2881 */
2882
cc411d0b 2883 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2884 spin_unlock(&ifp->lock);
122e4519 2885 read_unlock(&idev->lock);
1da177e4
LT		 2886
2887 addrconf_dad_completed(ifp);
2888
2889 goto out;
2890 }
2891
2892 ifp->probes--;
2893 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2894 spin_unlock(&ifp->lock);
122e4519 2895 read_unlock(&idev->lock);
1da177e4
LT		 2896
2897 /* send a neighbour solicitation for our addr */
1da177e4 2898 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2899 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2900out:
2901 in6_ifa_put(ifp);
2902}
2903
2904static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2905{
2906 struct net_device * dev = ifp->idev->dev;
2907
2908 /*
2909 * Configure the address for reception. Now it is valid.
2910 */
2911
2912 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2913
2914 /* If added prefix is link local and forwarding is off,
2915 start sending router solicitations.
2916 */
2917
2918 if (ifp->idev->cnf.forwarding == 0 &&
2919 ifp->idev->cnf.rtr_solicits > 0 &&
2920 (dev->flags&IFF_LOOPBACK) == 0 &&
2921 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2922 /*
2923 * If a host as already performed a random delay
2924 * [...] as part of DAD [...] there is no need
2925 * to delay again before sending the first RS
2926 */
f3ee4010 2927 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2928
2929 spin_lock_bh(&ifp->lock);
2930 ifp->probes = 1;
2931 ifp->idev->if_flags |= IF_RS_SENT;
2932 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2933 spin_unlock_bh(&ifp->lock);
2934 }
2935}
2936
c5e33bdd
YH		 2937static void addrconf_dad_run(struct inet6_dev *idev) {
2938 struct inet6_ifaddr *ifp;
2939
2940 read_lock_bh(&idev->lock);
2941 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
21809faf 2942 spin_lock(&ifp->lock);
c5e33bdd 2943 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2944 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2945 continue;
2946 }
21809faf 2947 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2948 addrconf_dad_kick(ifp);
2949 }
2950 read_unlock_bh(&idev->lock);
2951}
2952
1da177e4
LT		 2953#ifdef CONFIG_PROC_FS
2954struct if6_iter_state {
3c40090a 2955 struct seq_net_private p;
1da177e4
LT		 2956 int bucket;
2957};
2958
2959static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2960{
2961 struct inet6_ifaddr *ifa = NULL;
2962 struct if6_iter_state *state = seq->private;
1218854a 2963 struct net *net = seq_file_net(seq);
1da177e4
LT		 2964
2965 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2966 ifa = inet6_addr_lst[state->bucket];
3c40090a 2967
878628fb 2968 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2969 ifa = ifa->lst_next;
1da177e4
LT		 2970 if (ifa)
2971 break;
2972 }
2973 return ifa;
2974}
2975
2976static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2977{
2978 struct if6_iter_state *state = seq->private;
1218854a 2979 struct net *net = seq_file_net(seq);
1da177e4
LT		 2980
2981 ifa = ifa->lst_next;
2982try_again:
3c40090a 2983 if (ifa) {
878628fb 2984 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2985 ifa = ifa->lst_next;
2986 goto try_again;
2987 }
2988 }
2989
1da177e4
LT		 2990 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2991 ifa = inet6_addr_lst[state->bucket];
2992 goto try_again;
2993 }
3c40090a 2994
1da177e4
LT		 2995 return ifa;
2996}
2997
2998static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2999{
3000 struct inet6_ifaddr *ifa = if6_get_first(seq);
3001
3002 if (ifa)
3003 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3004 --pos;
3005 return pos ? NULL : ifa;
3006}
3007
3008static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 3009 __acquires(addrconf_hash_lock)
1da177e4
LT		 3010{
3011 read_lock_bh(&addrconf_hash_lock);
3012 return if6_get_idx(seq, *pos);
3013}
3014
3015static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3016{
3017 struct inet6_ifaddr *ifa;
3018
3019 ifa = if6_get_next(seq, v);
3020 ++*pos;
3021 return ifa;
3022}
3023
3024static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 3025 __releases(addrconf_hash_lock)
1da177e4
LT		 3026{
3027 read_unlock_bh(&addrconf_hash_lock);
3028}
3029
3030static int if6_seq_show(struct seq_file *seq, void *v)
3031{
3032 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3033 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3034 &ifp->addr,
1da177e4
LT		 3035 ifp->idev->dev->ifindex,
3036 ifp->prefix_len,
3037 ifp->scope,
3038 ifp->flags,
3039 ifp->idev->dev->name);
3040 return 0;
3041}
3042
56b3d975 3043static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3044 .start = if6_seq_start,
3045 .next = if6_seq_next,
3046 .show = if6_seq_show,
3047 .stop = if6_seq_stop,
3048};
3049
3050static int if6_seq_open(struct inode *inode, struct file *file)
3051{
3c40090a
DL		 3052 return seq_open_net(inode, file, &if6_seq_ops,
3053 sizeof(struct if6_iter_state));
1da177e4
LT		 3054}
3055
9a32144e 3056static const struct file_operations if6_fops = {
1da177e4
LT		 3057 .owner = THIS_MODULE,
3058 .open = if6_seq_open,
3059 .read = seq_read,
3060 .llseek = seq_lseek,
3c40090a 3061 .release = seq_release_net,
1da177e4
LT		 3062};
3063
2c8c1e72 3064static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3065{
3c40090a 3066 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3067 return -ENOMEM;
3068 return 0;
3069}
3070
2c8c1e72 3071static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3072{
3073 proc_net_remove(net, "if_inet6");
3074}
3075
3076static struct pernet_operations if6_proc_net_ops = {
3077 .init = if6_proc_net_init,
3078 .exit = if6_proc_net_exit,
3079};
3080
3081int __init if6_proc_init(void)
3082{
3083 return register_pernet_subsys(&if6_proc_net_ops);
3084}
3085
1da177e4
LT		 3086void if6_proc_exit(void)
3087{
3c40090a 3088 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3089}
3090#endif /* CONFIG_PROC_FS */
3091
59fbb3a6 3092#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3093/* Check if address is a home address configured on any interface. */
389f6612 3094int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3095{
3096 int ret = 0;
3097 struct inet6_ifaddr * ifp;
3098 u8 hash = ipv6_addr_hash(addr);
3099 read_lock_bh(&addrconf_hash_lock);
3100 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3101 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3102 continue;
caad295f 3103 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3104 (ifp->flags & IFA_F_HOMEADDRESS)) {
3105 ret = 1;
3106 break;
3107 }
3108 }
3109 read_unlock_bh(&addrconf_hash_lock);
3110 return ret;
3111}
3112#endif
3113
1da177e4
LT		 3114/*
3115 * Periodic address status verification
3116 */
3117
3118static void addrconf_verify(unsigned long foo)
3119{
3120 struct inet6_ifaddr *ifp;
3121 unsigned long now, next;
3122 int i;
3123
3124 spin_lock_bh(&addrconf_verify_lock);
3125 now = jiffies;
3126 next = now + ADDR_CHECK_FREQUENCY;
3127
3128 del_timer(&addr_chk_timer);
3129
3130 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3131
3132restart:
5d5780df 3133 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3134 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3135 unsigned long age;
3136#ifdef CONFIG_IPV6_PRIVACY
3137 unsigned long regen_advance;
3138#endif
3139
3140 if (ifp->flags & IFA_F_PERMANENT)
3141 continue;
3142
3143 spin_lock(&ifp->lock);
3144 age = (now - ifp->tstamp) / HZ;
3145
3146#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3147 regen_advance = ifp->idev->cnf.regen_max_retry *
3148 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3149 ifp->idev->nd_parms->retrans_time / HZ;
3150#endif
3151
8f27ebb9
YH		 3152 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3153 age >= ifp->valid_lft) {
1da177e4
LT		 3154 spin_unlock(&ifp->lock);
3155 in6_ifa_hold(ifp);
5d5780df 3156 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3157 ipv6_del_addr(ifp);
3158 goto restart;
8f27ebb9
YH		 3159 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3160 spin_unlock(&ifp->lock);
3161 continue;
1da177e4 3162 } else if (age >= ifp->prefered_lft) {
a1ed0526 3163 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3164 int deprecate = 0;
3165
3166 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3167 deprecate = 1;
3168 ifp->flags |= IFA_F_DEPRECATED;
3169 }
3170
3171 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3172 next = ifp->tstamp + ifp->valid_lft * HZ;
3173
3174 spin_unlock(&ifp->lock);
3175
3176 if (deprecate) {
3177 in6_ifa_hold(ifp);
5d5780df 3178 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3179
3180 ipv6_ifa_notify(0, ifp);
3181 in6_ifa_put(ifp);
3182 goto restart;
3183 }
3184#ifdef CONFIG_IPV6_PRIVACY
3185 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3186 !(ifp->flags&IFA_F_TENTATIVE)) {
3187 if (age >= ifp->prefered_lft - regen_advance) {
3188 struct inet6_ifaddr *ifpub = ifp->ifpub;
3189 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3190 next = ifp->tstamp + ifp->prefered_lft * HZ;
3191 if (!ifp->regen_count && ifpub) {
3192 ifp->regen_count++;
3193 in6_ifa_hold(ifp);
3194 in6_ifa_hold(ifpub);
3195 spin_unlock(&ifp->lock);
5d5780df 3196 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3197 spin_lock(&ifpub->lock);
3198 ifpub->regen_count = 0;
3199 spin_unlock(&ifpub->lock);
1da177e4
LT		 3200 ipv6_create_tempaddr(ifpub, ifp);
3201 in6_ifa_put(ifpub);
3202 in6_ifa_put(ifp);
3203 goto restart;
3204 }
3205 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3206 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3207 spin_unlock(&ifp->lock);
3208#endif
3209 } else {
3210 /* ifp->prefered_lft <= ifp->valid_lft */
3211 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3212 next = ifp->tstamp + ifp->prefered_lft * HZ;
3213 spin_unlock(&ifp->lock);
3214 }
3215 }
5d5780df 3216 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3217 }
3218
3219 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3220 add_timer(&addr_chk_timer);
3221 spin_unlock_bh(&addrconf_verify_lock);
3222}
3223
461d8837
TG		 3224static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3225{
3226 struct in6_addr *pfx = NULL;
3227
3228 if (addr)
3229 pfx = nla_data(addr);
3230
3231 if (local) {
3232 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3233 pfx = NULL;
3234 else
3235 pfx = nla_data(local);
3236 }
3237
3238 return pfx;
3239}
3240
ef7c79ed 3241static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3242 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3243 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3244 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3245};
3246
1da177e4
LT		 3247static int
3248inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3249{
3b1e0a65 3250 struct net *net = sock_net(skb->sk);
b933f716
TG		 3251 struct ifaddrmsg *ifm;
3252 struct nlattr *tb[IFA_MAX+1];
1da177e4 3253 struct in6_addr *pfx;
b933f716 3254 int err;
1da177e4 3255
b933f716
TG		 3256 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3257 if (err < 0)
3258 return err;
3259
3260 ifm = nlmsg_data(nlh);
3261 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3262 if (pfx == NULL)
3263 return -EINVAL;
3264
af284937 3265 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3266}
3267
55ebaef1
NT		 3268static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3269 u32 prefered_lft, u32 valid_lft)
081bba5b 3270{
6f704992
YH		 3271 u32 flags;
3272 clock_t expires;
4bed72e4 3273 unsigned long timeout;
46d48046 3274
081bba5b
NT		 3275 if (!valid_lft || (prefered_lft > valid_lft))
3276 return -EINVAL;
3277
4bed72e4
YH		 3278 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3279 if (addrconf_finite_timeout(timeout)) {
3280 expires = jiffies_to_clock_t(timeout * HZ);
3281 valid_lft = timeout;
6f704992 3282 flags = RTF_EXPIRES;
4bed72e4
YH		 3283 } else {
3284 expires = 0;
3285 flags = 0;
3286 ifa_flags |= IFA_F_PERMANENT;
6f704992 3287 }
081bba5b 3288
4bed72e4
YH		 3289 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3290 if (addrconf_finite_timeout(timeout)) {
3291 if (timeout == 0)
3292 ifa_flags |= IFA_F_DEPRECATED;
3293 prefered_lft = timeout;
3294 }
081bba5b
NT		 3295
3296 spin_lock_bh(&ifp->lock);
3b9f9a1c 3297 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3298 ifp->tstamp = jiffies;
3299 ifp->valid_lft = valid_lft;
3300 ifp->prefered_lft = prefered_lft;
3301
3302 spin_unlock_bh(&ifp->lock);
3303 if (!(ifp->flags&IFA_F_TENTATIVE))
3304 ipv6_ifa_notify(0, ifp);
081bba5b 3305
46d48046 3306 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3307 expires, flags);
081bba5b
NT		 3308 addrconf_verify(0);
3309
3310 return 0;
3311}
3312
1da177e4
LT		 3313static int
3314inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3315{
3b1e0a65 3316 struct net *net = sock_net(skb->sk);
461d8837
TG		 3317 struct ifaddrmsg *ifm;
3318 struct nlattr *tb[IFA_MAX+1];
1da177e4 3319 struct in6_addr *pfx;
7198f8ce
TG		 3320 struct inet6_ifaddr *ifa;
3321 struct net_device *dev;
55ebaef1
NT		 3322 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3323 u8 ifa_flags;
461d8837 3324 int err;
1da177e4 3325
461d8837
TG		 3326 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3327 if (err < 0)
3328 return err;
3329
3330 ifm = nlmsg_data(nlh);
3331 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3332 if (pfx == NULL)
3333 return -EINVAL;
3334
461d8837 3335 if (tb[IFA_CACHEINFO]) {
0778769d 3336 struct ifa_cacheinfo *ci;
461d8837
TG		 3337
3338 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3339 valid_lft = ci->ifa_valid;
461d8837
TG		 3340 preferred_lft = ci->ifa_prefered;
3341 } else {
3342 preferred_lft = INFINITY_LIFE_TIME;
3343 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3344 }
3345
af284937 3346 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3347 if (dev == NULL)
3348 return -ENODEV;
3349
55ebaef1 3350 /* We ignore other flags so far. */
3b9f9a1c 3351 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3352
1cab3da6 3353 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3354 if (ifa == NULL) {
3355 /*
3356 * It would be best to check for !NLM_F_CREATE here but
3357 * userspace alreay relies on not having to provide this.
3358 */
af284937
DL		 3359 return inet6_addr_add(net, ifm->ifa_index, pfx,
3360 ifm->ifa_prefixlen, ifa_flags,
3361 preferred_lft, valid_lft);
081bba5b
NT		 3362 }
3363
7198f8ce
TG		 3364 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3365 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3366 err = -EEXIST;
3367 else
55ebaef1 3368 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3369
3370 in6_ifa_put(ifa);
3371
3372 return err;
1da177e4
LT		 3373}
3374
101bb229
TG		 3375static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3376 u8 scope, int ifindex)
3377{
3378 struct ifaddrmsg *ifm;
3379
3380 ifm = nlmsg_data(nlh);
3381 ifm->ifa_family = AF_INET6;
3382 ifm->ifa_prefixlen = prefixlen;
3383 ifm->ifa_flags = flags;
3384 ifm->ifa_scope = scope;
3385 ifm->ifa_index = ifindex;
3386}
3387
85486af0
TG		 3388static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3389 unsigned long tstamp, u32 preferred, u32 valid)
3390{
3391 struct ifa_cacheinfo ci;
3392
3393 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3394 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3395 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3396 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3397 ci.ifa_prefered = preferred;
3398 ci.ifa_valid = valid;
3399
3400 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3401}
3402
101bb229
TG		 3403static inline int rt_scope(int ifa_scope)
3404{
3405 if (ifa_scope & IFA_HOST)
3406 return RT_SCOPE_HOST;
3407 else if (ifa_scope & IFA_LINK)
3408 return RT_SCOPE_LINK;
3409 else if (ifa_scope & IFA_SITE)
3410 return RT_SCOPE_SITE;
3411 else
3412 return RT_SCOPE_UNIVERSE;
3413}
3414
0ab6803b
TG		 3415static inline int inet6_ifaddr_msgsize(void)
3416{
339bf98f
TG		 3417 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3418 + nla_total_size(16) /* IFA_ADDRESS */
3419 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3420}
c5396a31 3421
1da177e4 3422static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3423 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3424{
1da177e4 3425 struct nlmsghdr *nlh;
85486af0 3426 u32 preferred, valid;
1da177e4 3427
0ab6803b
TG		 3428 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3429 if (nlh == NULL)
26932566 3430 return -EMSGSIZE;
0ab6803b 3431
101bb229
TG		 3432 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3433 ifa->idev->dev->ifindex);
3434
1da177e4 3435 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3436 preferred = ifa->prefered_lft;
3437 valid = ifa->valid_lft;
3438 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3439 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3440 if (preferred > tval)
3441 preferred -= tval;
3442 else
3443 preferred = 0;
85486af0
TG		 3444 if (valid != INFINITY_LIFE_TIME)
3445 valid -= tval;
1da177e4
LT		 3446 }
3447 } else {
85486af0
TG		 3448 preferred = INFINITY_LIFE_TIME;
3449 valid = INFINITY_LIFE_TIME;
3450 }
3451
0ab6803b 3452 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3453 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3454 nlmsg_cancel(skb, nlh);
3455 return -EMSGSIZE;
3456 }
1da177e4 3457
0ab6803b 3458 return nlmsg_end(skb, nlh);
1da177e4
LT		 3459}
3460
3461static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3462 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3463{
1da177e4 3464 struct nlmsghdr *nlh;
101bb229
TG		 3465 u8 scope = RT_SCOPE_UNIVERSE;
3466 int ifindex = ifmca->idev->dev->ifindex;
3467
3468 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3469 scope = RT_SCOPE_SITE;
1da177e4 3470
0ab6803b
TG		 3471 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3472 if (nlh == NULL)
26932566 3473 return -EMSGSIZE;
85486af0 3474
0ab6803b
TG		 3475 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3476 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3477 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3478 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3479 nlmsg_cancel(skb, nlh);
3480 return -EMSGSIZE;
3481 }
85486af0 3482
0ab6803b 3483 return nlmsg_end(skb, nlh);
1da177e4
LT		 3484}
3485
3486static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3487 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3488{
1da177e4 3489 struct nlmsghdr *nlh;
101bb229
TG		 3490 u8 scope = RT_SCOPE_UNIVERSE;
3491 int ifindex = ifaca->aca_idev->dev->ifindex;
3492
3493 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3494 scope = RT_SCOPE_SITE;
1da177e4 3495
0ab6803b
TG		 3496 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3497 if (nlh == NULL)
26932566 3498 return -EMSGSIZE;
85486af0 3499
0ab6803b
TG		 3500 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3501 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3502 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3503 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3504 nlmsg_cancel(skb, nlh);
3505 return -EMSGSIZE;
3506 }
1da177e4 3507
0ab6803b 3508 return nlmsg_end(skb, nlh);
1da177e4
LT		 3509}
3510
3511enum addr_type_t
3512{
3513 UNICAST_ADDR,
3514 MULTICAST_ADDR,
3515 ANYCAST_ADDR,
3516};
3517
234b27c3
ED		 3518/* called with rcu_read_lock() */
3519static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3520 struct netlink_callback *cb, enum addr_type_t type,
3521 int s_ip_idx, int *p_ip_idx)
3522{
3523 struct inet6_ifaddr *ifa;
3524 struct ifmcaddr6 *ifmca;
3525 struct ifacaddr6 *ifaca;
3526 int err = 1;
3527 int ip_idx = *p_ip_idx;
3528
3529 read_lock_bh(&idev->lock);
3530 switch (type) {
3531 case UNICAST_ADDR:
3532 /* unicast address incl. temp addr */
3533 for (ifa = idev->addr_list; ifa;
3534 ifa = ifa->if_next, ip_idx++) {
3535 if (ip_idx < s_ip_idx)
3536 continue;
3537 err = inet6_fill_ifaddr(skb, ifa,
3538 NETLINK_CB(cb->skb).pid,
3539 cb->nlh->nlmsg_seq,
3540 RTM_NEWADDR,
3541 NLM_F_MULTI);
3542 if (err <= 0)
3543 break;
3544 }
3545 break;
3546 case MULTICAST_ADDR:
3547 /* multicast address */
3548 for (ifmca = idev->mc_list; ifmca;
3549 ifmca = ifmca->next, ip_idx++) {
3550 if (ip_idx < s_ip_idx)
3551 continue;
3552 err = inet6_fill_ifmcaddr(skb, ifmca,
3553 NETLINK_CB(cb->skb).pid,
3554 cb->nlh->nlmsg_seq,
3555 RTM_GETMULTICAST,
3556 NLM_F_MULTI);
3557 if (err <= 0)
3558 break;
3559 }
3560 break;
3561 case ANYCAST_ADDR:
3562 /* anycast address */
3563 for (ifaca = idev->ac_list; ifaca;
3564 ifaca = ifaca->aca_next, ip_idx++) {
3565 if (ip_idx < s_ip_idx)
3566 continue;
3567 err = inet6_fill_ifacaddr(skb, ifaca,
3568 NETLINK_CB(cb->skb).pid,
3569 cb->nlh->nlmsg_seq,
3570 RTM_GETANYCAST,
3571 NLM_F_MULTI);
3572 if (err <= 0)
3573 break;
3574 }
3575 break;
3576 default:
3577 break;
3578 }
3579 read_unlock_bh(&idev->lock);
3580 *p_ip_idx = ip_idx;
3581 return err;
3582}
3583
1da177e4
LT		 3584static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3585 enum addr_type_t type)
3586{
234b27c3
ED		 3587 struct net *net = sock_net(skb->sk);
3588 int h, s_h;
1da177e4
LT		 3589 int idx, ip_idx;
3590 int s_idx, s_ip_idx;
1da177e4 3591 struct net_device *dev;
234b27c3
ED		 3592 struct inet6_dev *idev;
3593 struct hlist_head *head;
3594 struct hlist_node *node;
1ab1457c 3595
234b27c3
ED		 3596 s_h = cb->args[0];
3597 s_idx = idx = cb->args[1];
3598 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3599
234b27c3
ED		 3600 rcu_read_lock();
3601 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3602 idx = 0;
3603 head = &net->dev_index_head[h];
3604 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3605 if (idx < s_idx)
3606 goto cont;
3607 if (idx > s_idx)
3608 s_ip_idx = 0;
3609 ip_idx = 0;
3610 if ((idev = __in6_dev_get(dev)) == NULL)
3611 goto cont;
3612
3613 if (in6_dump_addrs(idev, skb, cb, type,
3614 s_ip_idx, &ip_idx) <= 0)
3615 goto done;
7562f876 3616cont:
234b27c3
ED		 3617 idx++;
3618 }
1da177e4 3619 }
234b27c3
ED		 3620done:
3621 rcu_read_unlock();
3622 cb->args[0] = h;
3623 cb->args[1] = idx;
3624 cb->args[2] = ip_idx;
3625
1da177e4
LT		 3626 return skb->len;
3627}
3628
3629static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3630{
3631 enum addr_type_t type = UNICAST_ADDR;
b854272b 3632
1da177e4
LT		 3633 return inet6_dump_addr(skb, cb, type);
3634}
3635
3636static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3637{
3638 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3639
1da177e4
LT		 3640 return inet6_dump_addr(skb, cb, type);
3641}
3642
3643
3644static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3645{
3646 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3647
1da177e4
LT		 3648 return inet6_dump_addr(skb, cb, type);
3649}
3650
1b29fc2c
TG		 3651static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3652 void *arg)
6c223828 3653{
3b1e0a65 3654 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3655 struct ifaddrmsg *ifm;
3656 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3657 struct in6_addr *addr = NULL;
3658 struct net_device *dev = NULL;
3659 struct inet6_ifaddr *ifa;
3660 struct sk_buff *skb;
6c223828
NT		 3661 int err;
3662
1b29fc2c
TG		 3663 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3664 if (err < 0)
3665 goto errout;
3666
3667 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3668 if (addr == NULL) {
3669 err = -EINVAL;
3670 goto errout;
6c223828 3671 }
6c223828 3672
1b29fc2c 3673 ifm = nlmsg_data(nlh);
6c223828 3674 if (ifm->ifa_index)
6fda7350 3675 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3676
1cab3da6 3677 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3678 err = -EADDRNOTAVAIL;
3679 goto errout;
3680 }
6c223828 3681
0ab6803b 3682 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3683 err = -ENOBUFS;
1b29fc2c 3684 goto errout_ifa;
6c223828
NT		 3685 }
3686
6c223828
NT		 3687 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3688 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3689 if (err < 0) {
3690 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3691 WARN_ON(err == -EMSGSIZE);
3692 kfree_skb(skb);
3693 goto errout_ifa;
3694 }
6fda7350 3695 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3696errout_ifa:
6c223828 3697 in6_ifa_put(ifa);
1b29fc2c 3698errout:
6c223828 3699 return err;
6c223828
NT		 3700}
3701
1da177e4
LT		 3702static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3703{
3704 struct sk_buff *skb;
c346dca1 3705 struct net *net = dev_net(ifa->idev->dev);
5d620266 3706 int err = -ENOBUFS;
1da177e4 3707
0ab6803b 3708 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3709 if (skb == NULL)
3710 goto errout;
3711
3712 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3713 if (err < 0) {
3714 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3715 WARN_ON(err == -EMSGSIZE);
3716 kfree_skb(skb);
3717 goto errout;
3718 }
1ce85fe4
PNA		 3719 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3720 return;
5d620266
TG		 3721errout:
3722 if (err < 0)
6fda7350 3723 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3724}
3725
b6f99a21 3726static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3727 __s32 *array, int bytes)
3728{
04561c1f
TG		 3729 BUG_ON(bytes < (DEVCONF_MAX * 4));
3730
1da177e4
LT		 3731 memset(array, 0, bytes);
3732 array[DEVCONF_FORWARDING] = cnf->forwarding;
3733 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3734 array[DEVCONF_MTU6] = cnf->mtu6;
3735 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3736 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3737 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3738 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3739 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3740 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3741 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3742 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3743#ifdef CONFIG_IPV6_PRIVACY
3744 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3745 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3746 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3747 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3748 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3749#endif
3750 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3751 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3752 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3753#ifdef CONFIG_IPV6_ROUTER_PREF
3754 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3755 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3756#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3757 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3758#endif
930d6ff2 3759#endif
fbea49e1 3760 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3761 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3762#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3763 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3764#endif
7bc570c8
YH		 3765#ifdef CONFIG_IPV6_MROUTE
3766 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3767#endif
778d80be 3768 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3769 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3770 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3771}
3772
339bf98f
TG		 3773static inline size_t inet6_if_nlmsg_size(void)
3774{
3775 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3776 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3777 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3778 + nla_total_size(4) /* IFLA_MTU */
3779 + nla_total_size(4) /* IFLA_LINK */
3780 + nla_total_size( /* IFLA_PROTINFO */
3781 nla_total_size(4) /* IFLA_INET6_FLAGS */
3782 + nla_total_size(sizeof(struct ifla_cacheinfo))
3783 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3784 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3785 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3786 );
3787}
c5396a31 3788
7d720c3e
TH		 3789static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3790 int items, int bytes)
7f7d9a6b
HX		 3791{
3792 int i;
3793 int pad = bytes - sizeof(u64) * items;
3794 BUG_ON(pad < 0);
3795
3796 /* Use put_unaligned() because stats may not be aligned for u64. */
3797 put_unaligned(items, &stats[0]);
3798 for (i = 1; i < items; i++)
3799 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3800
3801 memset(&stats[items], 0, pad);
3802}
3803
3804static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3805 int bytes)
3806{
3807 switch(attrtype) {
3808 case IFLA_INET6_STATS:
7d720c3e 3809 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3810 break;
3811 case IFLA_INET6_ICMP6STATS:
7d720c3e 3812 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3813 break;
3814 }
3815}
3816
1ab1457c 3817static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3818 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3819{
04561c1f 3820 struct net_device *dev = idev->dev;
bf99f1bd 3821 struct nlattr *nla;
04561c1f
TG		 3822 struct ifinfomsg *hdr;
3823 struct nlmsghdr *nlh;
3824 void *protoinfo;
3825 struct ifla_cacheinfo ci;
3826
3827 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3828 if (nlh == NULL)
26932566 3829 return -EMSGSIZE;
04561c1f
TG		 3830
3831 hdr = nlmsg_data(nlh);
3832 hdr->ifi_family = AF_INET6;
3833 hdr->__ifi_pad = 0;
3834 hdr->ifi_type = dev->type;
3835 hdr->ifi_index = dev->ifindex;
3836 hdr->ifi_flags = dev_get_flags(dev);
3837 hdr->ifi_change = 0;
3838
3839 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3840
3841 if (dev->addr_len)
04561c1f 3842 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3843
04561c1f 3844 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3845 if (dev->ifindex != dev->iflink)
04561c1f 3846 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3847
04561c1f
TG		 3848 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3849 if (protoinfo == NULL)
3850 goto nla_put_failure;
1da177e4 3851
04561c1f 3852 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3853
1da177e4
LT		 3854 ci.max_reasm_len = IPV6_MAXPLEN;
3855 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3856 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3857 ci.reachable_time = idev->nd_parms->reachable_time;
3858 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3859 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3860
bf99f1bd
YH		 3861 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3862 if (nla == NULL)
04561c1f 3863 goto nla_put_failure;
bf99f1bd 3864 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3865
bf99f1bd
YH		 3866 /* XXX - MC not implemented */
3867
3868 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3869 if (nla == NULL)
3870 goto nla_put_failure;
3871 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3872
3873 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3874 if (nla == NULL)
3875 goto nla_put_failure;
3876 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3877
04561c1f
TG		 3878 nla_nest_end(skb, protoinfo);
3879 return nlmsg_end(skb, nlh);
1da177e4 3880
04561c1f 3881nla_put_failure:
26932566
PM		 3882 nlmsg_cancel(skb, nlh);
3883 return -EMSGSIZE;
1da177e4
LT		 3884}
3885
3886static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3887{
3b1e0a65 3888 struct net *net = sock_net(skb->sk);
84d2697d 3889 int h, s_h;
434a8a58 3890 int idx = 0, s_idx;
1da177e4
LT		 3891 struct net_device *dev;
3892 struct inet6_dev *idev;
84d2697d
ED		 3893 struct hlist_head *head;
3894 struct hlist_node *node;
1da177e4 3895
84d2697d
ED		 3896 s_h = cb->args[0];
3897 s_idx = cb->args[1];
3898
3899 rcu_read_lock();
3900 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3901 idx = 0;
3902 head = &net->dev_index_head[h];
3903 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3904 if (idx < s_idx)
3905 goto cont;
3906 idev = __in6_dev_get(dev);
3907 if (!idev)
3908 goto cont;
3909 if (inet6_fill_ifinfo(skb, idev,
3910 NETLINK_CB(cb->skb).pid,
3911 cb->nlh->nlmsg_seq,
3912 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3913 goto out;
7562f876 3914cont:
84d2697d
ED		 3915 idx++;
3916 }
1da177e4 3917 }
84d2697d
ED		 3918out:
3919 rcu_read_unlock();
3920 cb->args[1] = idx;
3921 cb->args[0] = h;
1da177e4
LT		 3922
3923 return skb->len;
3924}
3925
3926void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3927{
3928 struct sk_buff *skb;
c346dca1 3929 struct net *net = dev_net(idev->dev);
8d7a76c9 3930 int err = -ENOBUFS;
1ab1457c 3931
339bf98f 3932 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3933 if (skb == NULL)
3934 goto errout;
3935
3936 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3937 if (err < 0) {
3938 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3939 WARN_ON(err == -EMSGSIZE);
3940 kfree_skb(skb);
3941 goto errout;
3942 }
1ce85fe4
PNA		 3943 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3944 return;
8d7a76c9
TG		 3945errout:
3946 if (err < 0)
6fda7350 3947 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3948}
3949
339bf98f
TG		 3950static inline size_t inet6_prefix_nlmsg_size(void)
3951{
3952 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3953 + nla_total_size(sizeof(struct in6_addr))
3954 + nla_total_size(sizeof(struct prefix_cacheinfo));
3955}
c5396a31 3956
1da177e4 3957static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3958 struct prefix_info *pinfo, u32 pid, u32 seq,
3959 int event, unsigned int flags)
1da177e4 3960{
6051e2f4
TG		 3961 struct prefixmsg *pmsg;
3962 struct nlmsghdr *nlh;
1da177e4
LT		 3963 struct prefix_cacheinfo ci;
3964
6051e2f4
TG		 3965 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3966 if (nlh == NULL)
26932566 3967 return -EMSGSIZE;
6051e2f4
TG		 3968
3969 pmsg = nlmsg_data(nlh);
1da177e4 3970 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3971 pmsg->prefix_pad1 = 0;
3972 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3973 pmsg->prefix_ifindex = idev->dev->ifindex;
3974 pmsg->prefix_len = pinfo->prefix_len;
3975 pmsg->prefix_type = pinfo->type;
8a47077a 3976 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3977 pmsg->prefix_flags = 0;
3978 if (pinfo->onlink)
3979 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3980 if (pinfo->autoconf)
3981 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3982
6051e2f4 3983 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3984
3985 ci.preferred_time = ntohl(pinfo->prefered);
3986 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3987 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3988
6051e2f4 3989 return nlmsg_end(skb, nlh);
1da177e4 3990
6051e2f4 3991nla_put_failure:
26932566
PM		 3992 nlmsg_cancel(skb, nlh);
3993 return -EMSGSIZE;
1da177e4
LT		 3994}
3995
1ab1457c 3996static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3997 struct prefix_info *pinfo)
3998{
3999 struct sk_buff *skb;
c346dca1 4000 struct net *net = dev_net(idev->dev);
8c384bfa 4001 int err = -ENOBUFS;
1da177e4 4002
339bf98f 4003 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4004 if (skb == NULL)
4005 goto errout;
4006
4007 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4008 if (err < 0) {
4009 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4010 WARN_ON(err == -EMSGSIZE);
4011 kfree_skb(skb);
4012 goto errout;
4013 }
1ce85fe4
PNA		 4014 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4015 return;
8c384bfa
TG		 4016errout:
4017 if (err < 0)
6fda7350 4018 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4019}
4020
1da177e4
LT		 4021static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4022{
4023 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4024
4025 switch (event) {
4026 case RTM_NEWADDR:
95c385b4
NH		 4027 /*
4028 * If the address was optimistic
4029 * we inserted the route at the start of
4030 * our DAD process, so we don't need
4031 * to do it again
4032 */
4033 if (!(ifp->rt->rt6i_node))
4034 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4035 if (ifp->idev->cnf.forwarding)
4036 addrconf_join_anycast(ifp);
4037 break;
4038 case RTM_DELADDR:
4039 if (ifp->idev->cnf.forwarding)
4040 addrconf_leave_anycast(ifp);
4041 addrconf_leave_solict(ifp->idev, &ifp->addr);
4042 dst_hold(&ifp->rt->u.dst);
e0a1ad73 4043 if (ip6_del_rt(ifp->rt))
1da177e4 4044 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4045 break;
4046 }
4047}
4048
4049static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4050{
8814c4b5 4051 rcu_read_lock_bh();
1da177e4
LT		 4052 if (likely(ifp->idev->dead == 0))
4053 __ipv6_ifa_notify(event, ifp);
8814c4b5 4054 rcu_read_unlock_bh();
1da177e4
LT		 4055}
4056
4057#ifdef CONFIG_SYSCTL
4058
4059static
8d65af78 4060int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4061 void __user *buffer, size_t *lenp, loff_t *ppos)
4062{
4063 int *valp = ctl->data;
4064 int val = *valp;
88af182e 4065 loff_t pos = *ppos;
1da177e4
LT		 4066 int ret;
4067
8d65af78 4068 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4069
c8fecf22 4070 if (write)
b325fddb 4071 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4072 if (ret)
4073 *ppos = pos;
1ab1457c 4074 return ret;
1da177e4
LT		 4075}
4076
56d417b1
BH		 4077static void dev_disable_change(struct inet6_dev *idev)
4078{
4079 if (!idev || !idev->dev)
4080 return;
4081
4082 if (idev->cnf.disable_ipv6)
4083 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4084 else
4085 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4086}
4087
4088static void addrconf_disable_change(struct net *net, __s32 newf)
4089{
4090 struct net_device *dev;
4091 struct inet6_dev *idev;
4092
c6d14c84
ED		 4093 rcu_read_lock();
4094 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4095 idev = __in6_dev_get(dev);
4096 if (idev) {
4097 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4098 idev->cnf.disable_ipv6 = newf;
4099 if (changed)
4100 dev_disable_change(idev);
4101 }
56d417b1 4102 }
c6d14c84 4103 rcu_read_unlock();
56d417b1
BH		 4104}
4105
4106static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4107{
4108 struct net *net;
4109
4110 net = (struct net *)table->extra2;
4111
4112 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4113 return 0;
4114
88af182e
EB		 4115 if (!rtnl_trylock()) {
4116 /* Restore the original values before restarting */
4117 *p = old;
56d417b1 4118 return restart_syscall();
88af182e 4119 }
56d417b1
BH		 4120
4121 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4122 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4123 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4124 addrconf_disable_change(net, newf);
4125 } else if ((!*p) ^ (!old))
4126 dev_disable_change((struct inet6_dev *)table->extra1);
4127
4128 rtnl_unlock();
4129 return 0;
4130}
4131
4132static
8d65af78 4133int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4134 void __user *buffer, size_t *lenp, loff_t *ppos)
4135{
4136 int *valp = ctl->data;
4137 int val = *valp;
88af182e 4138 loff_t pos = *ppos;
56d417b1
BH		 4139 int ret;
4140
8d65af78 4141 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4142
4143 if (write)
4144 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4145 if (ret)
4146 *ppos = pos;
56d417b1
BH		 4147 return ret;
4148}
4149
1da177e4
LT		 4150static struct addrconf_sysctl_table
4151{
4152 struct ctl_table_header *sysctl_header;
f6a07b29 4153 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4154 char *dev_name;
ab32ea5d 4155} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4156 .sysctl_header = NULL,
4157 .addrconf_vars = {
1ab1457c 4158 {
1da177e4 4159 .procname = "forwarding",
1ab1457c 4160 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4161 .maxlen = sizeof(int),
4162 .mode = 0644,
6d9f239a 4163 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4164 },
4165 {
1da177e4 4166 .procname = "hop_limit",
1ab1457c 4167 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4168 .maxlen = sizeof(int),
4169 .mode = 0644,
4170 .proc_handler = proc_dointvec,
4171 },
4172 {
1da177e4
LT		 4173 .procname = "mtu",
4174 .data = &ipv6_devconf.mtu6,
1ab1457c 4175 .maxlen = sizeof(int),
1da177e4 4176 .mode = 0644,
6d9f239a 4177 .proc_handler = proc_dointvec,
1da177e4
LT		 4178 },
4179 {
1da177e4 4180 .procname = "accept_ra",
1ab1457c 4181 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4182 .maxlen = sizeof(int),
4183 .mode = 0644,
6d9f239a 4184 .proc_handler = proc_dointvec,
1da177e4
LT		 4185 },
4186 {
1da177e4 4187 .procname = "accept_redirects",
1ab1457c 4188 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4189 .maxlen = sizeof(int),
4190 .mode = 0644,
6d9f239a 4191 .proc_handler = proc_dointvec,
1da177e4
LT		 4192 },
4193 {
1da177e4 4194 .procname = "autoconf",
1ab1457c 4195 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4196 .maxlen = sizeof(int),
4197 .mode = 0644,
6d9f239a 4198 .proc_handler = proc_dointvec,
1da177e4
LT		 4199 },
4200 {
1da177e4 4201 .procname = "dad_transmits",
1ab1457c 4202 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4203 .maxlen = sizeof(int),
4204 .mode = 0644,
6d9f239a 4205 .proc_handler = proc_dointvec,
1da177e4
LT		 4206 },
4207 {
1da177e4 4208 .procname = "router_solicitations",
1ab1457c 4209 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4210 .maxlen = sizeof(int),
4211 .mode = 0644,
6d9f239a 4212 .proc_handler = proc_dointvec,
1da177e4
LT		 4213 },
4214 {
1da177e4 4215 .procname = "router_solicitation_interval",
1ab1457c 4216 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4217 .maxlen = sizeof(int),
4218 .mode = 0644,
6d9f239a 4219 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4220 },
4221 {
1da177e4 4222 .procname = "router_solicitation_delay",
1ab1457c 4223 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4224 .maxlen = sizeof(int),
4225 .mode = 0644,
6d9f239a 4226 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4227 },
4228 {
1da177e4 4229 .procname = "force_mld_version",
1ab1457c 4230 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4231 .maxlen = sizeof(int),
4232 .mode = 0644,
6d9f239a 4233 .proc_handler = proc_dointvec,
1da177e4
LT		 4234 },
4235#ifdef CONFIG_IPV6_PRIVACY
4236 {
1da177e4 4237 .procname = "use_tempaddr",
1ab1457c 4238 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4239 .maxlen = sizeof(int),
4240 .mode = 0644,
6d9f239a 4241 .proc_handler = proc_dointvec,
1da177e4
LT		 4242 },
4243 {
1da177e4 4244 .procname = "temp_valid_lft",
1ab1457c 4245 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4246 .maxlen = sizeof(int),
4247 .mode = 0644,
6d9f239a 4248 .proc_handler = proc_dointvec,
1da177e4
LT		 4249 },
4250 {
1da177e4 4251 .procname = "temp_prefered_lft",
1ab1457c 4252 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4253 .maxlen = sizeof(int),
4254 .mode = 0644,
6d9f239a 4255 .proc_handler = proc_dointvec,
1da177e4
LT		 4256 },
4257 {
1da177e4 4258 .procname = "regen_max_retry",
1ab1457c 4259 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4260 .maxlen = sizeof(int),
4261 .mode = 0644,
6d9f239a 4262 .proc_handler = proc_dointvec,
1da177e4
LT		 4263 },
4264 {
1da177e4 4265 .procname = "max_desync_factor",
1ab1457c 4266 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4267 .maxlen = sizeof(int),
4268 .mode = 0644,
6d9f239a 4269 .proc_handler = proc_dointvec,
1da177e4
LT		 4270 },
4271#endif
4272 {
1da177e4
LT		 4273 .procname = "max_addresses",
4274 .data = &ipv6_devconf.max_addresses,
4275 .maxlen = sizeof(int),
4276 .mode = 0644,
6d9f239a 4277 .proc_handler = proc_dointvec,
1da177e4 4278 },
65f5c7c1 4279 {
65f5c7c1 4280 .procname = "accept_ra_defrtr",
1ab1457c 4281 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4282 .maxlen = sizeof(int),
4283 .mode = 0644,
6d9f239a 4284 .proc_handler = proc_dointvec,
65f5c7c1 4285 },
c4fd30eb 4286 {
c4fd30eb 4287 .procname = "accept_ra_pinfo",
1ab1457c 4288 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4289 .maxlen = sizeof(int),
4290 .mode = 0644,
6d9f239a 4291 .proc_handler = proc_dointvec,
c4fd30eb 4292 },
930d6ff2
YH		 4293#ifdef CONFIG_IPV6_ROUTER_PREF
4294 {
930d6ff2
YH		 4295 .procname = "accept_ra_rtr_pref",
4296 .data = &ipv6_devconf.accept_ra_rtr_pref,
4297 .maxlen = sizeof(int),
4298 .mode = 0644,
6d9f239a 4299 .proc_handler = proc_dointvec,
930d6ff2 4300 },
52e16356 4301 {
52e16356
YH		 4302 .procname = "router_probe_interval",
4303 .data = &ipv6_devconf.rtr_probe_interval,
4304 .maxlen = sizeof(int),
4305 .mode = 0644,
6d9f239a 4306 .proc_handler = proc_dointvec_jiffies,
52e16356 4307 },
fa03ef38 4308#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4309 {
09c884d4
YH		 4310 .procname = "accept_ra_rt_info_max_plen",
4311 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4312 .maxlen = sizeof(int),
4313 .mode = 0644,
6d9f239a 4314 .proc_handler = proc_dointvec,
09c884d4
YH		 4315 },
4316#endif
930d6ff2 4317#endif
fbea49e1 4318 {
fbea49e1
YH		 4319 .procname = "proxy_ndp",
4320 .data = &ipv6_devconf.proxy_ndp,
4321 .maxlen = sizeof(int),
4322 .mode = 0644,
6d9f239a 4323 .proc_handler = proc_dointvec,
fbea49e1 4324 },
0bcbc926 4325 {
0bcbc926
YH		 4326 .procname = "accept_source_route",
4327 .data = &ipv6_devconf.accept_source_route,
4328 .maxlen = sizeof(int),
4329 .mode = 0644,
6d9f239a 4330 .proc_handler = proc_dointvec,
0bcbc926 4331 },
95c385b4
NH		 4332#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4333 {
95c385b4
NH		 4334 .procname = "optimistic_dad",
4335 .data = &ipv6_devconf.optimistic_dad,
4336 .maxlen = sizeof(int),
4337 .mode = 0644,
6d9f239a 4338 .proc_handler = proc_dointvec,
95c385b4
NH		 4339
4340 },
7bc570c8
YH		 4341#endif
4342#ifdef CONFIG_IPV6_MROUTE
4343 {
7bc570c8
YH		 4344 .procname = "mc_forwarding",
4345 .data = &ipv6_devconf.mc_forwarding,
4346 .maxlen = sizeof(int),
a4e6db07 4347 .mode = 0444,
6d9f239a 4348 .proc_handler = proc_dointvec,
7bc570c8 4349 },
95c385b4 4350#endif
778d80be 4351 {
778d80be
YH		 4352 .procname = "disable_ipv6",
4353 .data = &ipv6_devconf.disable_ipv6,
4354 .maxlen = sizeof(int),
4355 .mode = 0644,
56d417b1 4356 .proc_handler = addrconf_sysctl_disable,
778d80be 4357 },
1b34be74 4358 {
1b34be74
YH		 4359 .procname = "accept_dad",
4360 .data = &ipv6_devconf.accept_dad,
4361 .maxlen = sizeof(int),
4362 .mode = 0644,
6d9f239a 4363 .proc_handler = proc_dointvec,
1b34be74 4364 },
f7734fdf 4365 {
f7734fdf
OP		 4366 .procname = "force_tllao",
4367 .data = &ipv6_devconf.force_tllao,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
4370 .proc_handler = proc_dointvec
4371 },
1da177e4 4372 {
f8572d8f 4373 /* sentinel */
1da177e4
LT		 4374 }
4375 },
1da177e4
LT		 4376};
4377
bff16c2f 4378static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4379 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4380{
4381 int i;
1da177e4 4382 struct addrconf_sysctl_table *t;
1da177e4 4383
1dab6222
PE		 4384#define ADDRCONF_CTL_PATH_DEV 3
4385
4386 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4387 { .procname = "net", },
4388 { .procname = "ipv6", },
4389 { .procname = "conf", },
1dab6222
PE		 4390 { /* to be set */ },
4391 { },
4392 };
4393
4394
af879cc7 4395 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4396 if (t == NULL)
f68635e6
PE		 4397 goto out;
4398
1da177e4
LT		 4399 for (i=0; t->addrconf_vars[i].data; i++) {
4400 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4401 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4402 t->addrconf_vars[i].extra2 = net;
1da177e4 4403 }
1da177e4 4404
1ab1457c
YH		 4405 /*
4406 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4407 * by sysctl and we wouldn't want anyone to change it under our feet
4408 * (see SIOCSIFNAME).
1ab1457c 4409 */
1dab6222
PE		 4410 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4411 if (!t->dev_name)
f68635e6 4412 goto free;
1da177e4 4413
1dab6222 4414 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4415
bff16c2f 4416 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4417 t->addrconf_vars);
1da177e4
LT		 4418 if (t->sysctl_header == NULL)
4419 goto free_procname;
f68635e6
PE		 4420
4421 p->sysctl = t;
95897312 4422 return 0;
1da177e4 4423
f68635e6 4424free_procname:
1dab6222 4425 kfree(t->dev_name);
f68635e6 4426free:
1da177e4 4427 kfree(t);
f68635e6 4428out:
95897312 4429 return -ENOBUFS;
1da177e4
LT		 4430}
4431
408c4768
PE		 4432static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4433{
4434 struct addrconf_sysctl_table *t;
4435
4436 if (p->sysctl == NULL)
4437 return;
4438
4439 t = p->sysctl;
4440 p->sysctl = NULL;
4441 unregister_sysctl_table(t->sysctl_header);
4442 kfree(t->dev_name);
4443 kfree(t);
4444}
4445
f52295a9
PE		 4446static void addrconf_sysctl_register(struct inet6_dev *idev)
4447{
54716e3b 4448 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4449 &ndisc_ifinfo_sysctl_change);
c346dca1 4450 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4451 idev, &idev->cnf);
f52295a9
PE		 4452}
4453
408c4768 4454static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4455{
408c4768
PE		 4456 __addrconf_sysctl_unregister(&idev->cnf);
4457 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4458}
4459
4460
4461#endif
4462
2c8c1e72 4463static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4464{
4465 int err;
4466 struct ipv6_devconf *all, *dflt;
4467
4468 err = -ENOMEM;
4469 all = &ipv6_devconf;
4470 dflt = &ipv6_devconf_dflt;
4471
09ad9bc7 4472 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4473 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4474 if (all == NULL)
4475 goto err_alloc_all;
4476
4477 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4478 if (dflt == NULL)
4479 goto err_alloc_dflt;
56d417b1
BH		 4480 } else {
4481 /* these will be inherited by all namespaces */
4482 dflt->autoconf = ipv6_defaults.autoconf;
4483 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4484 }
4485
4486 net->ipv6.devconf_all = all;
4487 net->ipv6.devconf_dflt = dflt;
4488
4489#ifdef CONFIG_SYSCTL
f8572d8f 4490 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4491 if (err < 0)
4492 goto err_reg_all;
4493
f8572d8f 4494 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4495 if (err < 0)
4496 goto err_reg_dflt;
4497#endif
4498 return 0;
4499
4500#ifdef CONFIG_SYSCTL
4501err_reg_dflt:
4502 __addrconf_sysctl_unregister(all);
4503err_reg_all:
4504 kfree(dflt);
4505#endif
4506err_alloc_dflt:
4507 kfree(all);
4508err_alloc_all:
4509 return err;
4510}
4511
2c8c1e72 4512static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4513{
4514#ifdef CONFIG_SYSCTL
4515 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4516 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4517#endif
09ad9bc7 4518 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4519 kfree(net->ipv6.devconf_dflt);
4520 kfree(net->ipv6.devconf_all);
4521 }
4522}
4523
4524static struct pernet_operations addrconf_ops = {
4525 .init = addrconf_init_net,
4526 .exit = addrconf_exit_net,
4527};
4528
1da177e4
LT		 4529/*
4530 * Device notifier
4531 */
4532
4533int register_inet6addr_notifier(struct notifier_block *nb)
4534{
1ab1457c 4535 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4536}
4537
7159039a
YH		 4538EXPORT_SYMBOL(register_inet6addr_notifier);
4539
1da177e4
LT		 4540int unregister_inet6addr_notifier(struct notifier_block *nb)
4541{
1ab1457c 4542 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4543}
4544
7159039a
YH		 4545EXPORT_SYMBOL(unregister_inet6addr_notifier);
4546
1da177e4
LT		 4547/*
4548 * Init / cleanup code
4549 */
4550
4551int __init addrconf_init(void)
4552{
2a8cc6c8
YH		 4553 int err;
4554
4555 if ((err = ipv6_addr_label_init()) < 0) {
4556 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4557 err);
4558 return err;
4559 }
1da177e4 4560
e0da5a48
PE		 4561 register_pernet_subsys(&addrconf_ops);
4562
1da177e4
LT		 4563 /* The addrconf netdev notifier requires that loopback_dev
4564 * has it's ipv6 private information allocated and setup
4565 * before it can bring up and give link-local addresses
4566 * to other devices which are up.
4567 *
4568 * Unfortunately, loopback_dev is not necessarily the first
4569 * entry in the global dev_base list of net devices. In fact,
4570 * it is likely to be the very last entry on that list.
4571 * So this causes the notifier registry below to try and
4572 * give link-local addresses to all devices besides loopback_dev
4573 * first, then loopback_dev, which cases all the non-loopback_dev
4574 * devices to fail to get a link-local address.
4575 *
4576 * So, as a temporary fix, allocate the ipv6 structure for
4577 * loopback_dev first by hand.
4578 * Longer term, all of the dependencies ipv6 has upon the loopback
4579 * device and it being up should be removed.
4580 */
4581 rtnl_lock();
2774c7ab 4582 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4583 err = -ENOMEM;
4584 rtnl_unlock();
4585 if (err)
e0da5a48 4586 goto errlo;
1da177e4
LT		 4587
4588 register_netdevice_notifier(&ipv6_dev_notf);
4589
1da177e4 4590 addrconf_verify(0);
c127ea2c
TG		 4591
4592 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4593 if (err < 0)
4594 goto errout;
4595
4596 /* Only the first call to __rtnl_register can fail */
4597 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4598 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4599 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4600 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4601 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4602
2a8cc6c8
YH		 4603 ipv6_addr_label_rtnl_register();
4604
1da177e4 4605 return 0;
c127ea2c
TG		 4606errout:
4607 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4608errlo:
4609 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4610
4611 return err;
1da177e4
LT		 4612}
4613
09f7709f 4614void addrconf_cleanup(void)
1da177e4 4615{
1ab1457c 4616 struct inet6_ifaddr *ifa;
176c39af 4617 struct net_device *dev;
1da177e4
LT		 4618 int i;
4619
4620 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4621 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4622
4623 rtnl_lock();
4624
176c39af
DL		 4625 /* clean dev list */
4626 for_each_netdev(&init_net, dev) {
4627 if (__in6_dev_get(dev) == NULL)
4628 continue;
4629 addrconf_ifdown(dev, 1);
4630 }
4631 addrconf_ifdown(init_net.loopback_dev, 2);
4632
1da177e4
LT		 4633 /*
4634 * Check hash table.
4635 */
1da177e4
LT		 4636 write_lock_bh(&addrconf_hash_lock);
4637 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4638 for (ifa=inet6_addr_lst[i]; ifa; ) {
4639 struct inet6_ifaddr *bifa;
4640
4641 bifa = ifa;
4642 ifa = ifa->lst_next;
4643 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4644 /* Do not free it; something is wrong.
4645 Now we can investigate it with debugger.
4646 */
4647 }
4648 }
4649 write_unlock_bh(&addrconf_hash_lock);
4650
4651 del_timer(&addr_chk_timer);
1da177e4 4652 rtnl_unlock();
1da177e4 4653}
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