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IPv6: addrconf notify when address is unavailable
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#ifdef CONFIG_SYSCTL
57#include <linux/sysctl.h>
58#endif
4fc268d2 59#include <linux/capability.h>
1da177e4
LT		 60#include <linux/delay.h>
61#include <linux/notifier.h>
543537bd 62#include <linux/string.h>
1da177e4 63
457c4cbc 64#include <net/net_namespace.h>
1da177e4
LT		 65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
5d620266 75#include <net/netlink.h>
f24e3d65 76#include <net/pkt_sched.h>
1da177e4
LT		 77#include <linux/if_tunnel.h>
78#include <linux/rtnetlink.h>
79
80#ifdef CONFIG_IPV6_PRIVACY
81#include <linux/random.h>
1da177e4
LT		 82#endif
83
84#include <asm/uaccess.h>
7f7d9a6b 85#include <asm/unaligned.h>
1da177e4
LT		 86
87#include <linux/proc_fs.h>
88#include <linux/seq_file.h>
89
90/* Set to 3 to get tracing... */
91#define ACONF_DEBUG 2
92
93#if ACONF_DEBUG >= 3
94#define ADBG(x) printk x
95#else
96#define ADBG(x)
97#endif
98
99#define INFINITY_LIFE_TIME 0xFFFFFFFF
100#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102#ifdef CONFIG_SYSCTL
f52295a9 103static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 104static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105#else
106static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107{
108}
109
110static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111{
112}
1da177e4
LT		 113#endif
114
115#ifdef CONFIG_IPV6_PRIVACY
116static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 117static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 118static void ipv6_regen_rndid(unsigned long data);
119
120static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 121#endif
122
1b34be74 123static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
75c78500
MS		 140static void addrconf_bonding_change(struct net_device *dev,
141 unsigned long event);
1da177e4
LT		 142static int addrconf_ifdown(struct net_device *dev, int how);
143
e431b8c0 144static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 145static void addrconf_dad_timer(unsigned long data);
146static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 147static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 148static void addrconf_rs_timer(unsigned long data);
149static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151
1ab1457c 152static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 153 struct prefix_info *pinfo);
06bfe655
DL		 154static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 struct net_device *dev);
1da177e4 156
e041c683 157static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 158
888c848e 159static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 160 .forwarding = 0,
161 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
162 .mtu6 = IPV6_MIN_MTU,
163 .accept_ra = 1,
164 .accept_redirects = 1,
165 .autoconf = 1,
166 .force_mld_version = 0,
167 .dad_transmits = 1,
168 .rtr_solicits = MAX_RTR_SOLICITATIONS,
169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
171#ifdef CONFIG_IPV6_PRIVACY
172 .use_tempaddr = 0,
173 .temp_valid_lft = TEMP_VALID_LIFETIME,
174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
175 .regen_max_retry = REGEN_MAX_RETRY,
176 .max_desync_factor = MAX_DESYNC_FACTOR,
177#endif
178 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 179 .accept_ra_defrtr = 1,
c4fd30eb 180 .accept_ra_pinfo = 1,
930d6ff2
YH		 181#ifdef CONFIG_IPV6_ROUTER_PREF
182 .accept_ra_rtr_pref = 1,
52e16356 183 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 184#ifdef CONFIG_IPV6_ROUTE_INFO
185 .accept_ra_rt_info_max_plen = 0,
186#endif
930d6ff2 187#endif
fbea49e1 188 .proxy_ndp = 0,
0bcbc926 189 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 190 .disable_ipv6 = 0,
1b34be74 191 .accept_dad = 1,
1da177e4
LT		 192};
193
ab32ea5d 194static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 195 .forwarding = 0,
196 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
197 .mtu6 = IPV6_MIN_MTU,
198 .accept_ra = 1,
199 .accept_redirects = 1,
200 .autoconf = 1,
201 .dad_transmits = 1,
202 .rtr_solicits = MAX_RTR_SOLICITATIONS,
203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205#ifdef CONFIG_IPV6_PRIVACY
206 .use_tempaddr = 0,
207 .temp_valid_lft = TEMP_VALID_LIFETIME,
208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
209 .regen_max_retry = REGEN_MAX_RETRY,
210 .max_desync_factor = MAX_DESYNC_FACTOR,
211#endif
212 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 213 .accept_ra_defrtr = 1,
c4fd30eb 214 .accept_ra_pinfo = 1,
930d6ff2
YH		 215#ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
52e16356 217 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 218#ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_max_plen = 0,
220#endif
930d6ff2 221#endif
fbea49e1 222 .proxy_ndp = 0,
0bcbc926 223 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 224 .disable_ipv6 = 0,
1b34be74 225 .accept_dad = 1,
1da177e4
LT		 226};
227
228/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 229const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 230const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 231const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 233
f24e3d65 234/* Check if a valid qdisc is available */
05297949 235static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 236{
05297949 237 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 238}
239
2b5ead46
YH		 240/* Check if a route is valid prefix route */
241static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242{
243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244}
245
1da177e4
LT		 246static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247{
248 if (del_timer(&ifp->timer))
249 __in6_ifa_put(ifp);
250}
251
252enum addrconf_timer_t
253{
254 AC_NONE,
255 AC_DAD,
256 AC_RS,
257};
258
259static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260 enum addrconf_timer_t what,
261 unsigned long when)
262{
263 if (!del_timer(&ifp->timer))
264 in6_ifa_hold(ifp);
265
266 switch (what) {
267 case AC_DAD:
268 ifp->timer.function = addrconf_dad_timer;
269 break;
270 case AC_RS:
271 ifp->timer.function = addrconf_rs_timer;
272 break;
273 default:;
274 }
275 ifp->timer.expires = jiffies + when;
276 add_timer(&ifp->timer);
277}
278
7f7d9a6b
HX		 279static int snmp6_alloc_dev(struct inet6_dev *idev)
280{
7d720c3e 281 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 282 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 283 goto err_ip;
7d720c3e 284 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 285 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 286 goto err_icmp;
7d720c3e 287 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 288 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 289 goto err_icmpmsg;
7f7d9a6b
HX		 290
291 return 0;
292
14878f75 293err_icmpmsg:
7d720c3e 294 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 295err_icmp:
7d720c3e 296 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 297err_ip:
aaf70ec7 298 return -ENOMEM;
7f7d9a6b
HX		 299}
300
16910b98 301static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 302{
7d720c3e
TH		 303 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 306}
307
1da177e4
LT		 308/* Nobody refers to this device, we may destroy it. */
309
8814c4b5
YH		 310static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311{
312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313 kfree(idev);
314}
315
1da177e4
LT		 316void in6_dev_finish_destroy(struct inet6_dev *idev)
317{
318 struct net_device *dev = idev->dev;
547b792c
IJ		 319
320 WARN_ON(idev->addr_list != NULL);
321 WARN_ON(idev->mc_list != NULL);
322
1da177e4
LT		 323#ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325#endif
326 dev_put(dev);
327 if (!idev->dead) {
328 printk("Freeing alive inet6 device %p\n", idev);
329 return;
330 }
331 snmp6_free_dev(idev);
8814c4b5 332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 333}
334
7159039a
YH		 335EXPORT_SYMBOL(in6_dev_finish_destroy);
336
1da177e4
LT		 337static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338{
339 struct inet6_dev *ndev;
340
341 ASSERT_RTNL();
342
343 if (dev->mtu < IPV6_MIN_MTU)
344 return NULL;
345
1ab1457c 346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 347
1ab1457c
YH		 348 if (ndev == NULL)
349 return NULL;
322f74a4
IO		 350
351 rwlock_init(&ndev->lock);
352 ndev->dev = dev;
c346dca1 353 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 354 ndev->cnf.mtu6 = dev->mtu;
355 ndev->cnf.sysctl = NULL;
356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357 if (ndev->nd_parms == NULL) {
358 kfree(ndev);
359 return NULL;
360 }
0187bdfb
BH		 361 if (ndev->cnf.forwarding)
362 dev_disable_lro(dev);
322f74a4
IO		 363 /* We refer to the device */
364 dev_hold(dev);
1da177e4 365
322f74a4
IO		 366 if (snmp6_alloc_dev(ndev) < 0) {
367 ADBG((KERN_WARNING
368 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 369 __func__, dev->name));
322f74a4
IO		 370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 ndev->dead = 1;
372 in6_dev_finish_destroy(ndev);
373 return NULL;
374 }
1da177e4 375
322f74a4
IO		 376 if (snmp6_register_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 379 __func__, dev->name));
322f74a4
IO		 380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 ndev->dead = 1;
382 in6_dev_finish_destroy(ndev);
383 return NULL;
384 }
385
386 /* One reference from device. We must do this before
387 * we invoke __ipv6_regen_rndid().
388 */
389 in6_dev_hold(ndev);
1da177e4 390
1b34be74
YH		 391 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392 ndev->cnf.accept_dad = -1;
393
b077d7ab
YH		 394#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396 printk(KERN_INFO
397 "%s: Disabled Multicast RS\n",
398 dev->name);
399 ndev->cnf.rtr_solicits = 0;
400 }
401#endif
402
1da177e4 403#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
9625ed72 407 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 408 dev->type == ARPHRD_SIT ||
0be669bb 409 dev->type == ARPHRD_NONE) {
322f74a4
IO		 410 printk(KERN_INFO
411 "%s: Disabled Privacy Extensions\n",
412 dev->name);
413 ndev->cnf.use_tempaddr = -1;
414 } else {
415 in6_dev_hold(ndev);
416 ipv6_regen_rndid((unsigned long) ndev);
417 }
1da177e4
LT		 418#endif
419
f24e3d65 420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 421 ndev->if_flags |= IF_READY;
422
322f74a4
IO		 423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
f52295a9 425 addrconf_sysctl_register(ndev);
30c4cf57
DS		 426 /* protected by rtnl_lock */
427 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 428
429 /* Join all-node multicast group */
f3ee4010 430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 431
1da177e4
LT		 432 return ndev;
433}
434
cee89473 435static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 436{
437 struct inet6_dev *idev;
438
439 ASSERT_RTNL();
440
441 if ((idev = __in6_dev_get(dev)) == NULL) {
442 if ((idev = ipv6_add_dev(dev)) == NULL)
443 return NULL;
444 }
c5e33bdd 445
1da177e4
LT		 446 if (dev->flags&IFF_UP)
447 ipv6_mc_up(idev);
448 return idev;
449}
450
451#ifdef CONFIG_SYSCTL
452static void dev_forward_change(struct inet6_dev *idev)
453{
454 struct net_device *dev;
455 struct inet6_ifaddr *ifa;
1da177e4
LT		 456
457 if (!idev)
458 return;
459 dev = idev->dev;
0187bdfb
BH		 460 if (idev->cnf.forwarding)
461 dev_disable_lro(dev);
1da177e4 462 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 463 if (idev->cnf.forwarding)
f3ee4010 464 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 465 else
f3ee4010 466 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 467 }
468 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 469 if (ifa->flags&IFA_F_TENTATIVE)
470 continue;
1da177e4
LT		 471 if (idev->cnf.forwarding)
472 addrconf_join_anycast(ifa);
473 else
474 addrconf_leave_anycast(ifa);
475 }
476}
477
478
e186932b 479static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 480{
481 struct net_device *dev;
482 struct inet6_dev *idev;
483
c6d14c84
ED		 484 rcu_read_lock();
485 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 486 idev = __in6_dev_get(dev);
487 if (idev) {
e186932b
PE		 488 int changed = (!idev->cnf.forwarding) ^ (!newf);
489 idev->cnf.forwarding = newf;
1da177e4
LT		 490 if (changed)
491 dev_forward_change(idev);
492 }
1da177e4 493 }
c6d14c84 494 rcu_read_unlock();
1da177e4 495}
c8fecf22 496
b325fddb 497static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 498{
bff16c2f
PE		 499 struct net *net;
500
501 net = (struct net *)table->extra2;
441fc2a2 502 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 503 return 0;
504
88af182e
EB		 505 if (!rtnl_trylock()) {
506 /* Restore the original values before restarting */
507 *p = old;
5007392d 508 return restart_syscall();
88af182e 509 }
c8fecf22 510
e186932b
PE		 511 if (p == &net->ipv6.devconf_all->forwarding) {
512 __s32 newf = net->ipv6.devconf_all->forwarding;
513 net->ipv6.devconf_dflt->forwarding = newf;
514 addrconf_forward_change(net, newf);
c8fecf22
PE		 515 } else if ((!*p) ^ (!old))
516 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 517 rtnl_unlock();
c8fecf22
PE		 518
519 if (*p)
7b4da532 520 rt6_purge_dflt_routers(net);
b325fddb 521 return 1;
c8fecf22 522}
1da177e4
LT		 523#endif
524
525/* Nobody refers to this ifaddr, destroy it */
526
527void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
528{
547b792c
IJ		 529 WARN_ON(ifp->if_next != NULL);
530 WARN_ON(ifp->lst_next != NULL);
531
1da177e4
LT		 532#ifdef NET_REFCNT_DEBUG
533 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
534#endif
535
536 in6_dev_put(ifp->idev);
537
538 if (del_timer(&ifp->timer))
539 printk("Timer is still running, when freeing ifa=%p\n", ifp);
540
541 if (!ifp->dead) {
542 printk("Freeing alive inet6 address %p\n", ifp);
543 return;
544 }
545 dst_release(&ifp->rt->u.dst);
546
547 kfree(ifp);
548}
549
e55ffac6
BH		 550static void
551ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
552{
553 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 554 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 555
556 /*
557 * Each device address list is sorted in order of scope -
558 * global before linklocal.
559 */
560 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
561 ifap = &ifa->if_next) {
8a6ce0c0 562 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 563 break;
564 }
565
566 ifp->if_next = *ifap;
567 *ifap = ifp;
568}
569
3eb84f49
YH		 570/*
571 * Hash function taken from net_alias.c
572 */
573static u8 ipv6_addr_hash(const struct in6_addr *addr)
574{
575 __u32 word;
576
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581
582 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
583 word ^= (word >> 16);
584 word ^= (word >> 8);
585
586 return ((word ^ (word >> 4)) & 0x0f);
587}
588
1da177e4
LT		 589/* On success it returns ifp with increased reference count */
590
591static struct inet6_ifaddr *
592ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 593 int scope, u32 flags)
1da177e4
LT		 594{
595 struct inet6_ifaddr *ifa = NULL;
596 struct rt6_info *rt;
597 int hash;
598 int err = 0;
d68b8270
YH		 599 int addr_type = ipv6_addr_type(addr);
600
601 if (addr_type == IPV6_ADDR_ANY ||
602 addr_type & IPV6_ADDR_MULTICAST ||
603 (!(idev->dev->flags & IFF_LOOPBACK) &&
604 addr_type & IPV6_ADDR_LOOPBACK))
605 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 606
8814c4b5 607 rcu_read_lock_bh();
1da177e4
LT		 608 if (idev->dead) {
609 err = -ENODEV; /*XXX*/
610 goto out2;
611 }
612
56d417b1 613 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 614 err = -EACCES;
615 goto out2;
616 }
617
1da177e4
LT		 618 write_lock(&addrconf_hash_lock);
619
620 /* Ignore adding duplicate addresses on an interface */
c346dca1 621 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 622 ADBG(("ipv6_add_addr: already assigned\n"));
623 err = -EEXIST;
624 goto out;
625 }
626
322f74a4 627 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 628
629 if (ifa == NULL) {
630 ADBG(("ipv6_add_addr: malloc failed\n"));
631 err = -ENOBUFS;
632 goto out;
633 }
634
635 rt = addrconf_dst_alloc(idev, addr, 0);
636 if (IS_ERR(rt)) {
637 err = PTR_ERR(rt);
638 goto out;
639 }
640
1da177e4
LT		 641 ipv6_addr_copy(&ifa->addr, addr);
642
643 spin_lock_init(&ifa->lock);
644 init_timer(&ifa->timer);
645 ifa->timer.data = (unsigned long) ifa;
646 ifa->scope = scope;
647 ifa->prefix_len = pfxlen;
648 ifa->flags = flags | IFA_F_TENTATIVE;
649 ifa->cstamp = ifa->tstamp = jiffies;
650
57f5f544
KF		 651 ifa->rt = rt;
652
95c385b4
NH		 653 /*
654 * part one of RFC 4429, section 3.3
655 * We should not configure an address as
656 * optimistic if we do not yet know the link
657 * layer address of our nexhop router
658 */
659
660 if (rt->rt6i_nexthop == NULL)
661 ifa->flags &= ~IFA_F_OPTIMISTIC;
662
1da177e4
LT		 663 ifa->idev = idev;
664 in6_dev_hold(idev);
665 /* For caller */
666 in6_ifa_hold(ifa);
667
668 /* Add to big hash table */
669 hash = ipv6_addr_hash(addr);
670
671 ifa->lst_next = inet6_addr_lst[hash];
672 inet6_addr_lst[hash] = ifa;
673 in6_ifa_hold(ifa);
674 write_unlock(&addrconf_hash_lock);
675
676 write_lock(&idev->lock);
677 /* Add to inet6_dev unicast addr list. */
e55ffac6 678 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 679
680#ifdef CONFIG_IPV6_PRIVACY
681 if (ifa->flags&IFA_F_TEMPORARY) {
682 ifa->tmp_next = idev->tempaddr_list;
683 idev->tempaddr_list = ifa;
684 in6_ifa_hold(ifa);
685 }
686#endif
687
1da177e4
LT		 688 in6_ifa_hold(ifa);
689 write_unlock(&idev->lock);
690out2:
8814c4b5 691 rcu_read_unlock_bh();
1da177e4 692
fd92833a 693 if (likely(err == 0))
e041c683 694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 695 else {
696 kfree(ifa);
697 ifa = ERR_PTR(err);
698 }
699
700 return ifa;
701out:
702 write_unlock(&addrconf_hash_lock);
703 goto out2;
704}
705
706/* This function wants to get referenced ifp and releases it before return */
707
708static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709{
710 struct inet6_ifaddr *ifa, **ifap;
711 struct inet6_dev *idev = ifp->idev;
712 int hash;
713 int deleted = 0, onlink = 0;
714 unsigned long expires = jiffies;
715
716 hash = ipv6_addr_hash(&ifp->addr);
717
718 ifp->dead = 1;
719
720 write_lock_bh(&addrconf_hash_lock);
721 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
722 ifap = &ifa->lst_next) {
723 if (ifa == ifp) {
724 *ifap = ifa->lst_next;
725 __in6_ifa_put(ifp);
726 ifa->lst_next = NULL;
727 break;
728 }
729 }
730 write_unlock_bh(&addrconf_hash_lock);
731
732 write_lock_bh(&idev->lock);
733#ifdef CONFIG_IPV6_PRIVACY
734 if (ifp->flags&IFA_F_TEMPORARY) {
735 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
736 ifap = &ifa->tmp_next) {
737 if (ifa == ifp) {
738 *ifap = ifa->tmp_next;
739 if (ifp->ifpub) {
740 in6_ifa_put(ifp->ifpub);
741 ifp->ifpub = NULL;
742 }
743 __in6_ifa_put(ifp);
744 ifa->tmp_next = NULL;
745 break;
746 }
747 }
748 }
749#endif
750
1d142804 751 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 752 if (ifa == ifp) {
753 *ifap = ifa->if_next;
754 __in6_ifa_put(ifp);
755 ifa->if_next = NULL;
756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 break;
758 deleted = 1;
1d142804 759 continue;
1da177e4
LT		 760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 ifp->prefix_len)) {
763 if (ifa->flags & IFA_F_PERMANENT) {
764 onlink = 1;
765 if (deleted)
766 break;
767 } else {
768 unsigned long lifetime;
769
770 if (!onlink)
771 onlink = -1;
772
773 spin_lock(&ifa->lock);
4bed72e4
YH		 774
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 /*
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
780 */
1da177e4
LT		 781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
785 }
786 }
787 }
1d142804 788 ifap = &ifa->if_next;
1da177e4
LT		 789 }
790 write_unlock_bh(&idev->lock);
791
b2238566
AV		 792 addrconf_del_timer(ifp);
793
1da177e4
LT		 794 ipv6_ifa_notify(RTM_DELADDR, ifp);
795
e041c683 796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 797
1da177e4
LT		 798 /*
799 * Purge or update corresponding prefix
800 *
801 * 1) we don't purge prefix here if address was not permanent.
802 * prefix is managed by its own lifetime.
803 * 2) if there're no addresses, delete prefix.
804 * 3) if there're still other permanent address(es),
805 * corresponding prefix is still permanent.
806 * 4) otherwise, update prefix lifetime to the
807 * longest valid lifetime among the corresponding
808 * addresses on the device.
809 * Note: subsequent RA will update lifetime.
810 *
811 * --yoshfuji
812 */
813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 struct in6_addr prefix;
815 struct rt6_info *rt;
c346dca1 816 struct net *net = dev_net(ifp->idev->dev);
1da177e4 817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 819
2b5ead46 820 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 821 if (onlink == 0) {
e0a1ad73 822 ip6_del_rt(rt);
1da177e4
LT		 823 rt = NULL;
824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 rt->rt6i_expires = expires;
826 rt->rt6i_flags |= RTF_EXPIRES;
827 }
828 }
829 dst_release(&rt->u.dst);
830 }
831
832 in6_ifa_put(ifp);
833}
834
835#ifdef CONFIG_IPV6_PRIVACY
836static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837{
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 841 unsigned long regen_advance;
1da177e4
LT		 842 int tmp_plen;
843 int ret = 0;
844 int max_addresses;
95c385b4 845 u32 addr_flags;
1da177e4
LT		 846
847 write_lock(&idev->lock);
848 if (ift) {
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
852 tmpaddr = &addr;
853 } else {
854 tmpaddr = NULL;
855 }
856retry:
857 in6_dev_hold(idev);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
860 printk(KERN_INFO
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 in6_ifa_hold(ifp);
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
882 printk(KERN_WARNING
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 ret = -1;
887 goto out;
888 }
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 tmp_valid_lft = min_t(__u32,
891 ifp->valid_lft,
892 idev->cnf.temp_valid_lft);
1ab1457c
YH		 893 tmp_prefered_lft = min_t(__u32,
894 ifp->prefered_lft,
1da177e4
LT		 895 idev->cnf.temp_prefered_lft - desync_factor / HZ);
896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
901
eac55bf9
BB		 902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
1da177e4 905 write_unlock(&idev->lock);
95c385b4 906
eac55bf9
BB		 907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
911 */
912 if (tmp_prefered_lft <= regen_advance) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 ret = -1;
916 goto out;
917 }
918
95c385b4
NH		 919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
923
1da177e4 924 ift = !max_addresses ||
1ab1457c 925 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 926 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 addr_flags) : NULL;
1da177e4
LT		 929 if (!ift || IS_ERR(ift)) {
930 in6_ifa_put(ifp);
931 in6_dev_put(idev);
932 printk(KERN_INFO
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 tmpaddr = &addr;
935 write_lock(&idev->lock);
936 goto retry;
937 }
938
939 spin_lock_bh(&ift->lock);
940 ift->ifpub = ifp;
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
946
947 addrconf_dad_start(ift, 0);
948 in6_ifa_put(ift);
949 in6_dev_put(idev);
950out:
951 return ret;
952}
953#endif
954
955/*
072047e4 956 * Choose an appropriate source address (RFC3484)
1da177e4 957 */
a9b05723
YH		 958enum {
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963#ifdef CONFIG_IPV6_MIP6
964 IPV6_SADDR_RULE_HOA,
965#endif
966 IPV6_SADDR_RULE_OIF,
967 IPV6_SADDR_RULE_LABEL,
968#ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
970#endif
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
973 IPV6_SADDR_RULE_MAX
974};
975
072047e4 976struct ipv6_saddr_score {
a9b05723
YH		 977 int rule;
978 int addr_type;
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 int scopedist;
982 int matchlen;
072047e4
YH		 983};
984
a9b05723 985struct ipv6_saddr_dst {
9acd9f3a 986 const struct in6_addr *addr;
a9b05723
YH		 987 int ifindex;
988 int scope;
989 int label;
7cbca67c 990 unsigned int prefs;
a9b05723 991};
072047e4 992
b6f99a21 993static inline int ipv6_saddr_preferred(int type)
1da177e4 994{
45bb0060 995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 996 return 1;
997 return 0;
1da177e4
LT		 998}
999
3de23255
BT		 1000static int ipv6_get_saddr_eval(struct net *net,
1001 struct ipv6_saddr_score *score,
a9b05723
YH		 1002 struct ipv6_saddr_dst *dst,
1003 int i)
1004{
1005 int ret;
1006
1007 if (i <= score->rule) {
1008 switch (i) {
1009 case IPV6_SADDR_RULE_SCOPE:
1010 ret = score->scopedist;
1011 break;
1012 case IPV6_SADDR_RULE_PREFIX:
1013 ret = score->matchlen;
1014 break;
1015 default:
1016 ret = !!test_bit(i, score->scorebits);
1017 }
1018 goto out;
1019 }
1020
1021 switch (i) {
1022 case IPV6_SADDR_RULE_INIT:
1023 /* Rule 0: remember if hiscore is not ready yet */
1024 ret = !!score->ifa;
1025 break;
1026 case IPV6_SADDR_RULE_LOCAL:
1027 /* Rule 1: Prefer same address */
1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029 break;
1030 case IPV6_SADDR_RULE_SCOPE:
1031 /* Rule 2: Prefer appropriate scope
1032 *
1033 * ret
1034 * ^
1035 * -1 | d 15
1036 * ---+--+-+---> scope
1037 * |
1038 * | d is scope of the destination.
1039 * B-d | \
1040 * | \ <- smaller scope is better if
1041 * B-15 | \ if scope is enough for destinaion.
1042 * | ret = B - scope (-1 <= scope >= d <= 15).
1043 * d-C-1 | /
1044 * |/ <- greater is better
1045 * -C / if scope is not enough for destination.
1046 * /| ret = scope - C (-1 <= d < scope <= 15).
1047 *
1048 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050 * Assume B = 0 and we get C > 29.
1051 */
1052 ret = __ipv6_addr_src_scope(score->addr_type);
1053 if (ret >= dst->scope)
1054 ret = -ret;
1055 else
1056 ret -= 128; /* 30 is enough */
1057 score->scopedist = ret;
1058 break;
1059 case IPV6_SADDR_RULE_PREFERRED:
1060 /* Rule 3: Avoid deprecated and optimistic addresses */
1061 ret = ipv6_saddr_preferred(score->addr_type) ||
1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063 break;
1064#ifdef CONFIG_IPV6_MIP6
1065 case IPV6_SADDR_RULE_HOA:
7cbca67c 1066 {
a9b05723 1067 /* Rule 4: Prefer home address */
7cbca67c
YH		 1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1070 break;
7cbca67c 1071 }
a9b05723
YH		 1072#endif
1073 case IPV6_SADDR_RULE_OIF:
1074 /* Rule 5: Prefer outgoing interface */
1075 ret = (!dst->ifindex ||
1076 dst->ifindex == score->ifa->idev->dev->ifindex);
1077 break;
1078 case IPV6_SADDR_RULE_LABEL:
1079 /* Rule 6: Prefer matching label */
3de23255
BT		 1080 ret = ipv6_addr_label(net,
1081 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1082 score->ifa->idev->dev->ifindex) == dst->label;
1083 break;
1084#ifdef CONFIG_IPV6_PRIVACY
1085 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1086 {
a9b05723
YH		 1087 /* Rule 7: Prefer public address
1088 * Note: prefer temprary address if use_tempaddr >= 2
1089 */
7cbca67c
YH		 1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092 score->ifa->idev->cnf.use_tempaddr >= 2;
1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1094 break;
7cbca67c 1095 }
a9b05723
YH		 1096#endif
1097 case IPV6_SADDR_RULE_ORCHID:
1098 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099 * non-ORCHID vs non-ORCHID
1100 */
1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102 ipv6_addr_orchid(dst->addr));
1103 break;
1104 case IPV6_SADDR_RULE_PREFIX:
1105 /* Rule 8: Use longest matching prefix */
1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107 dst->addr);
1108 break;
1109 default:
1110 ret = 0;
1111 }
1112
1113 if (ret)
1114 __set_bit(i, score->scorebits);
1115 score->rule = i;
1116out:
1117 return ret;
1118}
1119
191cd582 1120int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1121 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1122 struct in6_addr *saddr)
1da177e4 1123{
a9b05723
YH		 1124 struct ipv6_saddr_score scores[2],
1125 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1126 struct ipv6_saddr_dst dst;
072047e4 1127 struct net_device *dev;
a9b05723 1128 int dst_type;
1da177e4 1129
a9b05723
YH		 1130 dst_type = __ipv6_addr_type(daddr);
1131 dst.addr = daddr;
1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1135 dst.prefs = prefs;
a9b05723
YH		 1136
1137 hiscore->rule = -1;
1138 hiscore->ifa = NULL;
1da177e4 1139
8814c4b5 1140 rcu_read_lock();
1da177e4 1141
c6d14c84 1142 for_each_netdev_rcu(net, dev) {
072047e4 1143 struct inet6_dev *idev;
072047e4 1144
a9b05723 1145 /* Candidate Source Address (section 4)
072047e4
YH		 1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
a9b05723
YH		 1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1160 continue;
1da177e4 1161
1da177e4 1162 idev = __in6_dev_get(dev);
072047e4
YH		 1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
a9b05723
YH		 1167 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1168 int i;
072047e4 1169
a9b05723 1170 /*
6b3ae80a
YH		 1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
95c385b4 1174 * sense, unless it is also flagged as optimistic.
6b3ae80a 1175 * - Candidate Source Address (section 4)
072047e4
YH		 1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
a9b05723
YH		 1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1182 continue;
a9b05723
YH		 1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1188 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1189 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
a9b05723
YH		 1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
3de23255
BT		 1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
a9b05723
YH		 1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
a0bffffc 1224 swap(hiscore, score);
a9b05723
YH		 1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1da177e4 1230 }
072047e4 1231 }
1da177e4 1232 }
a9b05723 1233try_nextdev:
072047e4 1234 read_unlock_bh(&idev->lock);
1da177e4 1235 }
8814c4b5 1236 rcu_read_unlock();
1da177e4 1237
a9b05723 1238 if (!hiscore->ifa)
072047e4 1239 return -EADDRNOTAVAIL;
1ab1457c 1240
a9b05723
YH		 1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
072047e4 1243 return 0;
1da177e4
LT		 1244}
1245
5e5f3f0f 1246EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1247
95c385b4
NH		 1248int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249 unsigned char banned_flags)
1da177e4
LT		 1250{
1251 struct inet6_dev *idev;
1252 int err = -EADDRNOTAVAIL;
1253
8814c4b5 1254 rcu_read_lock();
1da177e4
LT		 1255 if ((idev = __in6_dev_get(dev)) != NULL) {
1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
1259 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1260 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1261 ipv6_addr_copy(addr, &ifp->addr);
1262 err = 0;
1263 break;
1264 }
1265 }
1266 read_unlock_bh(&idev->lock);
1267 }
8814c4b5 1268 rcu_read_unlock();
1da177e4
LT		 1269 return err;
1270}
1271
1272static int ipv6_count_addresses(struct inet6_dev *idev)
1273{
1274 int cnt = 0;
1275 struct inet6_ifaddr *ifp;
1276
1277 read_lock_bh(&idev->lock);
1278 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1279 cnt++;
1280 read_unlock_bh(&idev->lock);
1281 return cnt;
1282}
1283
bfeade08
DL		 1284int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285 struct net_device *dev, int strict)
1da177e4
LT		 1286{
1287 struct inet6_ifaddr * ifp;
1288 u8 hash = ipv6_addr_hash(addr);
1289
1290 read_lock_bh(&addrconf_hash_lock);
1291 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1292 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1293 continue;
1da177e4
LT		 1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295 !(ifp->flags&IFA_F_TENTATIVE)) {
1296 if (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1298 break;
1299 }
1300 }
1301 read_unlock_bh(&addrconf_hash_lock);
1302 return ifp != NULL;
1303}
7159039a
YH		 1304EXPORT_SYMBOL(ipv6_chk_addr);
1305
1da177e4 1306static
06bfe655
DL		 1307int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1308 struct net_device *dev)
1da177e4
LT		 1309{
1310 struct inet6_ifaddr * ifp;
1311 u8 hash = ipv6_addr_hash(addr);
1312
1313 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1314 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1315 continue;
1da177e4
LT		 1316 if (ipv6_addr_equal(&ifp->addr, addr)) {
1317 if (dev == NULL || ifp->idev->dev == dev)
1318 break;
1319 }
1320 }
1321 return ifp != NULL;
1322}
1323
52eeeb84
YH		 1324int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1325{
1326 struct inet6_dev *idev;
1327 struct inet6_ifaddr *ifa;
1328 int onlink;
1329
1330 onlink = 0;
1331 rcu_read_lock();
1332 idev = __in6_dev_get(dev);
1333 if (idev) {
1334 read_lock_bh(&idev->lock);
1335 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1336 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1337 ifa->prefix_len);
1338 if (onlink)
1339 break;
1340 }
1341 read_unlock_bh(&idev->lock);
1342 }
1343 rcu_read_unlock();
1344 return onlink;
1345}
1346
1347EXPORT_SYMBOL(ipv6_chk_prefix);
1348
9acd9f3a 1349struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1350 struct net_device *dev, int strict)
1da177e4
LT		 1351{
1352 struct inet6_ifaddr * ifp;
1353 u8 hash = ipv6_addr_hash(addr);
1354
1355 read_lock_bh(&addrconf_hash_lock);
1356 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1357 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1358 continue;
1da177e4
LT		 1359 if (ipv6_addr_equal(&ifp->addr, addr)) {
1360 if (dev == NULL || ifp->idev->dev == dev ||
1361 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362 in6_ifa_hold(ifp);
1363 break;
1364 }
1365 }
1366 }
1367 read_unlock_bh(&addrconf_hash_lock);
1368
1369 return ifp;
1370}
1371
1da177e4
LT		 1372/* Gets referenced address, destroys ifaddr */
1373
cc411d0b 1374static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1375{
1da177e4
LT		 1376 if (ifp->flags&IFA_F_PERMANENT) {
1377 spin_lock_bh(&ifp->lock);
1378 addrconf_del_timer(ifp);
1379 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1380 if (dad_failed)
1381 ifp->flags |= IFA_F_DADFAILED;
1da177e4
LT		 1382 spin_unlock_bh(&ifp->lock);
1383 in6_ifa_put(ifp);
1384#ifdef CONFIG_IPV6_PRIVACY
1385 } else if (ifp->flags&IFA_F_TEMPORARY) {
1386 struct inet6_ifaddr *ifpub;
1387 spin_lock_bh(&ifp->lock);
1388 ifpub = ifp->ifpub;
1389 if (ifpub) {
1390 in6_ifa_hold(ifpub);
1391 spin_unlock_bh(&ifp->lock);
1392 ipv6_create_tempaddr(ifpub, ifp);
1393 in6_ifa_put(ifpub);
1394 } else {
1395 spin_unlock_bh(&ifp->lock);
1396 }
1397 ipv6_del_addr(ifp);
1398#endif
1399 } else
1400 ipv6_del_addr(ifp);
1401}
1402
3c21edbd
YH		 1403void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1404{
1b34be74 1405 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1406
1407 if (net_ratelimit())
0522fea6
JR		 1408 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1409 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1410
1b34be74
YH		 1411 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1412 struct in6_addr addr;
1413
1414 addr.s6_addr32[0] = htonl(0xfe800000);
1415 addr.s6_addr32[1] = 0;
1416
1417 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1418 ipv6_addr_equal(&ifp->addr, &addr)) {
1419 /* DAD failed for link-local based on MAC address */
1420 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1421
1422 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1423 ifp->idev->dev->name);
1b34be74
YH		 1424 }
1425 }
1426
cc411d0b 1427 addrconf_dad_stop(ifp, 1);
3c21edbd 1428}
1da177e4
LT		 1429
1430/* Join to solicited addr multicast group. */
1431
1432void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1433{
1434 struct in6_addr maddr;
1435
1436 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1437 return;
1438
1439 addrconf_addr_solict_mult(addr, &maddr);
1440 ipv6_dev_mc_inc(dev, &maddr);
1441}
1442
1443void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1444{
1445 struct in6_addr maddr;
1446
1447 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1448 return;
1449
1450 addrconf_addr_solict_mult(addr, &maddr);
1451 __ipv6_dev_mc_dec(idev, &maddr);
1452}
1453
20380731 1454static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1455{
1456 struct in6_addr addr;
1457 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1458 if (ipv6_addr_any(&addr))
1459 return;
1460 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1461}
1462
20380731 1463static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1464{
1465 struct in6_addr addr;
1466 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1467 if (ipv6_addr_any(&addr))
1468 return;
1469 __ipv6_dev_ac_dec(ifp->idev, &addr);
1470}
1471
073a8e0e
YH		 1472static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1473{
1474 if (dev->addr_len != ETH_ALEN)
1475 return -1;
1476 memcpy(eui, dev->dev_addr, 3);
1477 memcpy(eui + 5, dev->dev_addr + 3, 3);
1478
1479 /*
1480 * The zSeries OSA network cards can be shared among various
1481 * OS instances, but the OSA cards have only one MAC address.
1482 * This leads to duplicate address conflicts in conjunction
1483 * with IPv6 if more than one instance uses the same card.
1484 *
1485 * The driver for these cards can deliver a unique 16-bit
1486 * identifier for each instance sharing the same card. It is
1487 * placed instead of 0xFFFE in the interface identifier. The
1488 * "u" bit of the interface identifier is not inverted in this
1489 * case. Hence the resulting interface identifier has local
1490 * scope according to RFC2373.
1491 */
1492 if (dev->dev_id) {
1493 eui[3] = (dev->dev_id >> 8) & 0xFF;
1494 eui[4] = dev->dev_id & 0xFF;
1495 } else {
1496 eui[3] = 0xFF;
1497 eui[4] = 0xFE;
1498 eui[0] ^= 2;
1499 }
1500 return 0;
1501}
1502
1503static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1504{
1505 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1506 if (dev->addr_len != ARCNET_ALEN)
1507 return -1;
1508 memset(eui, 0, 7);
1509 eui[7] = *(u8*)dev->dev_addr;
1510 return 0;
1511}
1512
1513static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1514{
1515 if (dev->addr_len != INFINIBAND_ALEN)
1516 return -1;
1517 memcpy(eui, dev->dev_addr + 12, 8);
1518 eui[0] |= 2;
1519 return 0;
1520}
1521
dfd982ba
YH		 1522int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1523{
9af28511
SH		 1524 if (addr == 0)
1525 return -1;
dfd982ba
YH		 1526 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1527 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1528 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1529 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1530 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1531 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1532 eui[1] = 0;
1533 eui[2] = 0x5E;
1534 eui[3] = 0xFE;
1535 memcpy(eui + 4, &addr, 4);
1536 return 0;
1537}
1538EXPORT_SYMBOL(__ipv6_isatap_ifid);
1539
1540static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1541{
1542 if (dev->priv_flags & IFF_ISATAP)
1543 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1544 return -1;
1545}
1546
1da177e4
LT		 1547static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1548{
1549 switch (dev->type) {
1550 case ARPHRD_ETHER:
1551 case ARPHRD_FDDI:
1552 case ARPHRD_IEEE802_TR:
073a8e0e 1553 return addrconf_ifid_eui48(eui, dev);
1da177e4 1554 case ARPHRD_ARCNET:
073a8e0e 1555 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1556 case ARPHRD_INFINIBAND:
073a8e0e 1557 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1558 case ARPHRD_SIT:
dfd982ba 1559 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1560 }
1561 return -1;
1562}
1563
1564static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1565{
1566 int err = -1;
1567 struct inet6_ifaddr *ifp;
1568
1569 read_lock_bh(&idev->lock);
1570 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1571 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1572 memcpy(eui, ifp->addr.s6_addr+8, 8);
1573 err = 0;
1574 break;
1575 }
1576 }
1577 read_unlock_bh(&idev->lock);
1578 return err;
1579}
1580
1581#ifdef CONFIG_IPV6_PRIVACY
1582/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1583static int __ipv6_regen_rndid(struct inet6_dev *idev)
1584{
1da177e4 1585regen:
955189ef 1586 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1587 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1588
1589 /*
1590 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1591 * check if generated address is not inappropriate
1592 *
1593 * - Reserved subnet anycast (RFC 2526)
1594 * 11111101 11....11 1xxxxxxx
c7dc89c0 1595 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1596 * 00-00-5E-FE-xx-xx-xx-xx
1597 * - value 0
1598 * - XXX: already assigned to an address on the device
1599 */
1ab1457c 1600 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1601 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1602 (idev->rndid[7]&0x80))
1603 goto regen;
1604 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1605 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1606 goto regen;
1607 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1608 goto regen;
1609 }
1610
1611 return 0;
1612}
1613
1614static void ipv6_regen_rndid(unsigned long data)
1615{
1616 struct inet6_dev *idev = (struct inet6_dev *) data;
1617 unsigned long expires;
1618
8814c4b5 1619 rcu_read_lock_bh();
1da177e4
LT		 1620 write_lock_bh(&idev->lock);
1621
1622 if (idev->dead)
1623 goto out;
1624
1625 if (__ipv6_regen_rndid(idev) < 0)
1626 goto out;
1ab1457c 1627
1da177e4 1628 expires = jiffies +
1ab1457c 1629 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1630 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1631 if (time_before(expires, jiffies)) {
1632 printk(KERN_WARNING
1633 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1634 idev->dev->name);
1635 goto out;
1636 }
1637
1638 if (!mod_timer(&idev->regen_timer, expires))
1639 in6_dev_hold(idev);
1640
1641out:
1642 write_unlock_bh(&idev->lock);
8814c4b5 1643 rcu_read_unlock_bh();
1da177e4
LT		 1644 in6_dev_put(idev);
1645}
1646
1647static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1648 int ret = 0;
1649
1650 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1651 ret = __ipv6_regen_rndid(idev);
1652 return ret;
1653}
1654#endif
1655
1656/*
1657 * Add prefix route.
1658 */
1659
1660static void
1661addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1662 unsigned long expires, u32 flags)
1da177e4 1663{
86872cb5
TG		 1664 struct fib6_config cfg = {
1665 .fc_table = RT6_TABLE_PREFIX,
1666 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1667 .fc_ifindex = dev->ifindex,
1668 .fc_expires = expires,
1669 .fc_dst_len = plen,
1670 .fc_flags = RTF_UP | flags,
c346dca1 1671 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1672 .fc_protocol = RTPROT_KERNEL,
86872cb5 1673 };
1da177e4 1674
86872cb5 1675 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1676
1677 /* Prevent useless cloning on PtP SIT.
1678 This thing is done here expecting that the whole
1679 class of non-broadcast devices need not cloning.
1680 */
0be669bb 1681#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1682 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1683 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1684#endif
1da177e4 1685
86872cb5 1686 ip6_route_add(&cfg);
1da177e4
LT		 1687}
1688
1689/* Create "default" multicast route to the interface */
1690
1691static void addrconf_add_mroute(struct net_device *dev)
1692{
86872cb5
TG		 1693 struct fib6_config cfg = {
1694 .fc_table = RT6_TABLE_LOCAL,
1695 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1696 .fc_ifindex = dev->ifindex,
1697 .fc_dst_len = 8,
1698 .fc_flags = RTF_UP,
c346dca1 1699 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1700 };
1701
1702 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1703
1704 ip6_route_add(&cfg);
1da177e4
LT		 1705}
1706
0be669bb 1707#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1708static void sit_route_add(struct net_device *dev)
1709{
86872cb5
TG		 1710 struct fib6_config cfg = {
1711 .fc_table = RT6_TABLE_MAIN,
1712 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1713 .fc_ifindex = dev->ifindex,
1714 .fc_dst_len = 96,
1715 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1716 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1717 };
1da177e4
LT		 1718
1719 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1720 ip6_route_add(&cfg);
1da177e4 1721}
0be669bb 1722#endif
1da177e4
LT		 1723
1724static void addrconf_add_lroute(struct net_device *dev)
1725{
1726 struct in6_addr addr;
1727
1728 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1729 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1730}
1731
1732static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1733{
1734 struct inet6_dev *idev;
1735
1736 ASSERT_RTNL();
1737
1738 if ((idev = ipv6_find_idev(dev)) == NULL)
1739 return NULL;
1740
1741 /* Add default multicast route */
1742 addrconf_add_mroute(dev);
1743
1744 /* Add link local route */
1745 addrconf_add_lroute(dev);
1746 return idev;
1747}
1748
1749void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1750{
1751 struct prefix_info *pinfo;
1752 __u32 valid_lft;
1753 __u32 prefered_lft;
1754 int addr_type;
1da177e4 1755 struct inet6_dev *in6_dev;
56d417b1 1756 struct net *net = dev_net(dev);
1da177e4
LT		 1757
1758 pinfo = (struct prefix_info *) opt;
1ab1457c 1759
1da177e4
LT		 1760 if (len < sizeof(struct prefix_info)) {
1761 ADBG(("addrconf: prefix option too short\n"));
1762 return;
1763 }
1ab1457c 1764
1da177e4
LT		 1765 /*
1766 * Validation checks ([ADDRCONF], page 19)
1767 */
1768
1769 addr_type = ipv6_addr_type(&pinfo->prefix);
1770
1771 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1772 return;
1773
1774 valid_lft = ntohl(pinfo->valid);
1775 prefered_lft = ntohl(pinfo->prefered);
1776
1777 if (prefered_lft > valid_lft) {
1778 if (net_ratelimit())
1779 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1780 return;
1781 }
1782
1783 in6_dev = in6_dev_get(dev);
1784
1785 if (in6_dev == NULL) {
1786 if (net_ratelimit())
1787 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1788 return;
1789 }
1790
1791 /*
1792 * Two things going on here:
1793 * 1) Add routes for on-link prefixes
1794 * 2) Configure prefixes with the auto flag set
1795 */
1796
4bed72e4
YH		 1797 if (pinfo->onlink) {
1798 struct rt6_info *rt;
1799 unsigned long rt_expires;
1800
6f704992
YH		 1801 /* Avoid arithmetic overflow. Really, we could
1802 * save rt_expires in seconds, likely valid_lft,
1803 * but it would require division in fib gc, that it
1804 * not good.
1805 */
4bed72e4
YH		 1806 if (HZ > USER_HZ)
1807 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1808 else
1809 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1810
4bed72e4
YH		 1811 if (addrconf_finite_timeout(rt_expires))
1812 rt_expires *= HZ;
1da177e4 1813
56d417b1 1814 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1815 dev->ifindex, 1);
1da177e4 1816
2b5ead46 1817 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1818 /* Autoconf prefix route */
1819 if (valid_lft == 0) {
1820 ip6_del_rt(rt);
1821 rt = NULL;
4bed72e4 1822 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1823 /* not infinity */
1824 rt->rt6i_expires = jiffies + rt_expires;
1825 rt->rt6i_flags |= RTF_EXPIRES;
1826 } else {
1827 rt->rt6i_flags &= ~RTF_EXPIRES;
1828 rt->rt6i_expires = 0;
1da177e4
LT		 1829 }
1830 } else if (valid_lft) {
6f704992 1831 clock_t expires = 0;
4bed72e4
YH		 1832 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1833 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1834 /* not infinity */
1835 flags |= RTF_EXPIRES;
1836 expires = jiffies_to_clock_t(rt_expires);
1837 }
1da177e4 1838 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1839 dev, expires, flags);
1da177e4
LT		 1840 }
1841 if (rt)
1842 dst_release(&rt->u.dst);
1843 }
1844
1845 /* Try to figure out our local address for this prefix */
1846
1847 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1848 struct inet6_ifaddr * ifp;
1849 struct in6_addr addr;
1850 int create = 0, update_lft = 0;
1851
1852 if (pinfo->prefix_len == 64) {
1853 memcpy(&addr, &pinfo->prefix, 8);
1854 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1855 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1856 in6_dev_put(in6_dev);
1857 return;
1858 }
1859 goto ok;
1860 }
1861 if (net_ratelimit())
1862 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1863 pinfo->prefix_len);
1864 in6_dev_put(in6_dev);
1865 return;
1866
1867ok:
1868
53b7997f 1869 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1870
1871 if (ifp == NULL && valid_lft) {
1872 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1873 u32 addr_flags = 0;
1874
1875#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1876 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1877 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1878 addr_flags = IFA_F_OPTIMISTIC;
1879#endif
1da177e4
LT		 1880
1881 /* Do not allow to create too much of autoconfigured
1882 * addresses; this would be too easy way to crash kernel.
1883 */
1884 if (!max_addresses ||
1885 ipv6_count_addresses(in6_dev) < max_addresses)
1886 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1887 addr_type&IPV6_ADDR_SCOPE_MASK,
1888 addr_flags);
1da177e4
LT		 1889
1890 if (!ifp || IS_ERR(ifp)) {
1891 in6_dev_put(in6_dev);
1892 return;
1893 }
1894
1895 update_lft = create = 1;
1896 ifp->cstamp = jiffies;
1897 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1898 }
1899
1900 if (ifp) {
1901 int flags;
1902 unsigned long now;
1903#ifdef CONFIG_IPV6_PRIVACY
1904 struct inet6_ifaddr *ift;
1905#endif
1906 u32 stored_lft;
1907
1908 /* update lifetime (RFC2462 5.5.3 e) */
1909 spin_lock(&ifp->lock);
1910 now = jiffies;
1911 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1912 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1913 else
1914 stored_lft = 0;
1915 if (!update_lft && stored_lft) {
1916 if (valid_lft > MIN_VALID_LIFETIME ||
1917 valid_lft > stored_lft)
1918 update_lft = 1;
1919 else if (stored_lft <= MIN_VALID_LIFETIME) {
1920 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1921 /*
1922 * RFC 4862 Section 5.5.3e:
1923 * "Note that the preferred lifetime of
1924 * the corresponding address is always
1925 * reset to the Preferred Lifetime in
1926 * the received Prefix Information
1927 * option, regardless of whether the
1928 * valid lifetime is also reset or
1929 * ignored."
1930 *
1931 * So if the preferred lifetime in
1932 * this advertisement is different
1933 * than what we have stored, but the
1934 * valid lifetime is invalid, just
1935 * reset prefered_lft.
1936 *
1937 * We must set the valid lifetime
1938 * to the stored lifetime since we'll
1939 * be updating the timestamp below,
1940 * else we'll set it back to the
1941 * minumum.
1942 */
1943 if (prefered_lft != ifp->prefered_lft) {
1944 valid_lft = stored_lft;
1945 update_lft = 1;
1946 }
1da177e4
LT		 1947 } else {
1948 valid_lft = MIN_VALID_LIFETIME;
1949 if (valid_lft < prefered_lft)
1950 prefered_lft = valid_lft;
1951 update_lft = 1;
1952 }
1953 }
1954
1955 if (update_lft) {
1956 ifp->valid_lft = valid_lft;
1957 ifp->prefered_lft = prefered_lft;
1958 ifp->tstamp = now;
1959 flags = ifp->flags;
1960 ifp->flags &= ~IFA_F_DEPRECATED;
1961 spin_unlock(&ifp->lock);
1962
1963 if (!(flags&IFA_F_TENTATIVE))
1964 ipv6_ifa_notify(0, ifp);
1965 } else
1966 spin_unlock(&ifp->lock);
1967
1968#ifdef CONFIG_IPV6_PRIVACY
1969 read_lock_bh(&in6_dev->lock);
1970 /* update all temporary addresses in the list */
1971 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1972 /*
1973 * When adjusting the lifetimes of an existing
1974 * temporary address, only lower the lifetimes.
1975 * Implementations must not increase the
1976 * lifetimes of an existing temporary address
1977 * when processing a Prefix Information Option.
1978 */
c6fbfac2
BB		 1979 if (ifp != ift->ifpub)
1980 continue;
1981
1da177e4
LT		 1982 spin_lock(&ift->lock);
1983 flags = ift->flags;
1984 if (ift->valid_lft > valid_lft &&
1985 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1986 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1987 if (ift->prefered_lft > prefered_lft &&
1988 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1989 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1990 spin_unlock(&ift->lock);
1991 if (!(flags&IFA_F_TENTATIVE))
1992 ipv6_ifa_notify(0, ift);
1993 }
1994
1995 if (create && in6_dev->cnf.use_tempaddr > 0) {
1996 /*
1997 * When a new public address is created as described in [ADDRCONF],
1998 * also create a new temporary address.
1999 */
1ab1457c 2000 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2001 ipv6_create_tempaddr(ifp, NULL);
2002 } else {
2003 read_unlock_bh(&in6_dev->lock);
2004 }
2005#endif
2006 in6_ifa_put(ifp);
2007 addrconf_verify(0);
2008 }
2009 }
2010 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2011 in6_dev_put(in6_dev);
2012}
2013
2014/*
2015 * Set destination address.
2016 * Special case for SIT interfaces where we create a new "virtual"
2017 * device.
2018 */
af284937 2019int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2020{
2021 struct in6_ifreq ireq;
2022 struct net_device *dev;
2023 int err = -EINVAL;
2024
2025 rtnl_lock();
2026
2027 err = -EFAULT;
2028 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029 goto err_exit;
2030
af284937 2031 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2032
2033 err = -ENODEV;
2034 if (dev == NULL)
2035 goto err_exit;
2036
0be669bb 2037#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2038 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2039 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2040 struct ifreq ifr;
1da177e4
LT		 2041 struct ip_tunnel_parm p;
2042
2043 err = -EADDRNOTAVAIL;
2044 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2045 goto err_exit;
2046
2047 memset(&p, 0, sizeof(p));
2048 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2049 p.iph.saddr = 0;
2050 p.iph.version = 4;
2051 p.iph.ihl = 5;
2052 p.iph.protocol = IPPROTO_IPV6;
2053 p.iph.ttl = 64;
d20b3109 2054 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2055
5bc3eb7e
SH		 2056 if (ops->ndo_do_ioctl) {
2057 mm_segment_t oldfs = get_fs();
2058
2059 set_fs(KERNEL_DS);
2060 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2061 set_fs(oldfs);
2062 } else
2063 err = -EOPNOTSUPP;
1da177e4
LT		 2064
2065 if (err == 0) {
2066 err = -ENOBUFS;
af284937
DL		 2067 dev = __dev_get_by_name(net, p.name);
2068 if (!dev)
1da177e4
LT		 2069 goto err_exit;
2070 err = dev_open(dev);
2071 }
2072 }
0be669bb 2073#endif
1da177e4
LT		 2074
2075err_exit:
2076 rtnl_unlock();
2077 return err;
2078}
2079
2080/*
2081 * Manual configuration of address on an interface
2082 */
af284937 2083static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2084 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2085 __u32 valid_lft)
1da177e4
LT		 2086{
2087 struct inet6_ifaddr *ifp;
2088 struct inet6_dev *idev;
2089 struct net_device *dev;
2090 int scope;
6f704992
YH		 2091 u32 flags;
2092 clock_t expires;
4bed72e4 2093 unsigned long timeout;
1da177e4
LT		 2094
2095 ASSERT_RTNL();
1ab1457c 2096
24ef0da7
TG		 2097 if (plen > 128)
2098 return -EINVAL;
2099
0778769d
NT		 2100 /* check the lifetime */
2101 if (!valid_lft || prefered_lft > valid_lft)
2102 return -EINVAL;
2103
af284937
DL		 2104 dev = __dev_get_by_index(net, ifindex);
2105 if (!dev)
1da177e4 2106 return -ENODEV;
1ab1457c 2107
1da177e4
LT		 2108 if ((idev = addrconf_add_dev(dev)) == NULL)
2109 return -ENOBUFS;
2110
2111 scope = ipv6_addr_scope(pfx);
2112
4bed72e4
YH		 2113 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2114 if (addrconf_finite_timeout(timeout)) {
2115 expires = jiffies_to_clock_t(timeout * HZ);
2116 valid_lft = timeout;
6f704992 2117 flags = RTF_EXPIRES;
4bed72e4
YH		 2118 } else {
2119 expires = 0;
2120 flags = 0;
2121 ifa_flags |= IFA_F_PERMANENT;
6f704992 2122 }
0778769d 2123
4bed72e4
YH		 2124 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2125 if (addrconf_finite_timeout(timeout)) {
2126 if (timeout == 0)
2127 ifa_flags |= IFA_F_DEPRECATED;
2128 prefered_lft = timeout;
2129 }
0778769d
NT		 2130
2131 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2132
1da177e4 2133 if (!IS_ERR(ifp)) {
06aebfb7 2134 spin_lock_bh(&ifp->lock);
0778769d
NT		 2135 ifp->valid_lft = valid_lft;
2136 ifp->prefered_lft = prefered_lft;
2137 ifp->tstamp = jiffies;
06aebfb7 2138 spin_unlock_bh(&ifp->lock);
0778769d 2139
46d48046 2140 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2141 expires, flags);
95c385b4
NH		 2142 /*
2143 * Note that section 3.1 of RFC 4429 indicates
2144 * that the Optimistic flag should not be set for
2145 * manually configured addresses
2146 */
1da177e4
LT		 2147 addrconf_dad_start(ifp, 0);
2148 in6_ifa_put(ifp);
0778769d 2149 addrconf_verify(0);
1da177e4
LT		 2150 return 0;
2151 }
2152
2153 return PTR_ERR(ifp);
2154}
2155
af284937 2156static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2157 unsigned int plen)
1da177e4
LT		 2158{
2159 struct inet6_ifaddr *ifp;
2160 struct inet6_dev *idev;
2161 struct net_device *dev;
1ab1457c 2162
24ef0da7
TG		 2163 if (plen > 128)
2164 return -EINVAL;
2165
af284937
DL		 2166 dev = __dev_get_by_index(net, ifindex);
2167 if (!dev)
1da177e4
LT		 2168 return -ENODEV;
2169
2170 if ((idev = __in6_dev_get(dev)) == NULL)
2171 return -ENXIO;
2172
2173 read_lock_bh(&idev->lock);
2174 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2175 if (ifp->prefix_len == plen &&
2176 ipv6_addr_equal(pfx, &ifp->addr)) {
2177 in6_ifa_hold(ifp);
2178 read_unlock_bh(&idev->lock);
1ab1457c 2179
1da177e4
LT		 2180 ipv6_del_addr(ifp);
2181
2182 /* If the last address is deleted administratively,
2183 disable IPv6 on this interface.
2184 */
2185 if (idev->addr_list == NULL)
2186 addrconf_ifdown(idev->dev, 1);
2187 return 0;
2188 }
2189 }
2190 read_unlock_bh(&idev->lock);
2191 return -EADDRNOTAVAIL;
2192}
2193
2194
af284937 2195int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2196{
2197 struct in6_ifreq ireq;
2198 int err;
1ab1457c 2199
1da177e4
LT		 2200 if (!capable(CAP_NET_ADMIN))
2201 return -EPERM;
1ab1457c 2202
1da177e4
LT		 2203 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2204 return -EFAULT;
2205
2206 rtnl_lock();
af284937
DL		 2207 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2208 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2209 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2210 rtnl_unlock();
2211 return err;
2212}
2213
af284937 2214int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2215{
2216 struct in6_ifreq ireq;
2217 int err;
1ab1457c 2218
1da177e4
LT		 2219 if (!capable(CAP_NET_ADMIN))
2220 return -EPERM;
2221
2222 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2223 return -EFAULT;
2224
2225 rtnl_lock();
af284937
DL		 2226 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2227 ireq.ifr6_prefixlen);
1da177e4
LT		 2228 rtnl_unlock();
2229 return err;
2230}
2231
b5f348e5
IJ		 2232static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2233 int plen, int scope)
2234{
2235 struct inet6_ifaddr *ifp;
2236
2237 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2238 if (!IS_ERR(ifp)) {
2239 spin_lock_bh(&ifp->lock);
2240 ifp->flags &= ~IFA_F_TENTATIVE;
2241 spin_unlock_bh(&ifp->lock);
2242 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2243 in6_ifa_put(ifp);
2244 }
2245}
2246
0be669bb 2247#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2248static void sit_add_v4_addrs(struct inet6_dev *idev)
2249{
1da177e4
LT		 2250 struct in6_addr addr;
2251 struct net_device *dev;
c346dca1 2252 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2253 int scope;
2254
2255 ASSERT_RTNL();
2256
2257 memset(&addr, 0, sizeof(struct in6_addr));
2258 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2259
2260 if (idev->dev->flags&IFF_POINTOPOINT) {
2261 addr.s6_addr32[0] = htonl(0xfe800000);
2262 scope = IFA_LINK;
2263 } else {
2264 scope = IPV6_ADDR_COMPATv4;
2265 }
2266
2267 if (addr.s6_addr32[3]) {
b5f348e5 2268 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2269 return;
2270 }
2271
6fda7350 2272 for_each_netdev(net, dev) {
e5ed6399 2273 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2274 if (in_dev && (dev->flags & IFF_UP)) {
2275 struct in_ifaddr * ifa;
2276
2277 int flag = scope;
2278
2279 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2280 int plen;
2281
2282 addr.s6_addr32[3] = ifa->ifa_local;
2283
2284 if (ifa->ifa_scope == RT_SCOPE_LINK)
2285 continue;
2286 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2287 if (idev->dev->flags&IFF_POINTOPOINT)
2288 continue;
2289 flag |= IFA_HOST;
2290 }
2291 if (idev->dev->flags&IFF_POINTOPOINT)
2292 plen = 64;
2293 else
2294 plen = 96;
2295
b5f348e5 2296 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2297 }
2298 }
1ab1457c 2299 }
1da177e4 2300}
0be669bb 2301#endif
1da177e4
LT		 2302
2303static void init_loopback(struct net_device *dev)
2304{
2305 struct inet6_dev *idev;
1da177e4
LT		 2306
2307 /* ::1 */
2308
2309 ASSERT_RTNL();
2310
2311 if ((idev = ipv6_find_idev(dev)) == NULL) {
2312 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2313 return;
2314 }
2315
b5f348e5 2316 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2317}
2318
2319static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2320{
2321 struct inet6_ifaddr * ifp;
95c385b4
NH		 2322 u32 addr_flags = IFA_F_PERMANENT;
2323
2324#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2325 if (idev->cnf.optimistic_dad &&
702beb87 2326 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2327 addr_flags |= IFA_F_OPTIMISTIC;
2328#endif
1da177e4 2329
95c385b4
NH		 2330
2331 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2332 if (!IS_ERR(ifp)) {
46d48046 2333 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2334 addrconf_dad_start(ifp, 0);
2335 in6_ifa_put(ifp);
2336 }
2337}
2338
2339static void addrconf_dev_config(struct net_device *dev)
2340{
2341 struct in6_addr addr;
2342 struct inet6_dev * idev;
2343
2344 ASSERT_RTNL();
2345
74235a25
HX		 2346 if ((dev->type != ARPHRD_ETHER) &&
2347 (dev->type != ARPHRD_FDDI) &&
2348 (dev->type != ARPHRD_IEEE802_TR) &&
2349 (dev->type != ARPHRD_ARCNET) &&
2350 (dev->type != ARPHRD_INFINIBAND)) {
2351 /* Alas, we support only Ethernet autoconfiguration. */
2352 return;
2353 }
2354
1da177e4
LT		 2355 idev = addrconf_add_dev(dev);
2356 if (idev == NULL)
2357 return;
2358
2359 memset(&addr, 0, sizeof(struct in6_addr));
2360 addr.s6_addr32[0] = htonl(0xFE800000);
2361
2362 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2363 addrconf_add_linklocal(idev, &addr);
2364}
2365
0be669bb 2366#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2367static void addrconf_sit_config(struct net_device *dev)
2368{
2369 struct inet6_dev *idev;
2370
2371 ASSERT_RTNL();
2372
1ab1457c
YH		 2373 /*
2374 * Configure the tunnel with one of our IPv4
2375 * addresses... we should configure all of
1da177e4
LT		 2376 * our v4 addrs in the tunnel
2377 */
2378
2379 if ((idev = ipv6_find_idev(dev)) == NULL) {
2380 printk(KERN_DEBUG "init sit: add_dev failed\n");
2381 return;
2382 }
2383
c7dc89c0
FT		 2384 if (dev->priv_flags & IFF_ISATAP) {
2385 struct in6_addr addr;
2386
2387 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2388 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2389 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2390 addrconf_add_linklocal(idev, &addr);
2391 return;
2392 }
2393
1da177e4
LT		 2394 sit_add_v4_addrs(idev);
2395
2396 if (dev->flags&IFF_POINTOPOINT) {
2397 addrconf_add_mroute(dev);
2398 addrconf_add_lroute(dev);
2399 } else
2400 sit_route_add(dev);
2401}
0be669bb 2402#endif
1da177e4
LT		 2403
2404static inline int
2405ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2406{
2407 struct in6_addr lladdr;
2408
95c385b4 2409 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2410 addrconf_add_linklocal(idev, &lladdr);
2411 return 0;
2412 }
2413 return -1;
2414}
2415
2416static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2417{
2418 struct net_device *link_dev;
c346dca1 2419 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2420
2421 /* first try to inherit the link-local address from the link device */
2422 if (idev->dev->iflink &&
6fda7350 2423 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2424 if (!ipv6_inherit_linklocal(idev, link_dev))
2425 return;
2426 }
2427 /* then try to inherit it from any device */
6fda7350 2428 for_each_netdev(net, link_dev) {
1da177e4
LT		 2429 if (!ipv6_inherit_linklocal(idev, link_dev))
2430 return;
2431 }
2432 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2433}
2434
2435/*
2436 * Autoconfigure tunnel with a link-local address so routing protocols,
2437 * DHCPv6, MLD etc. can be run over the virtual link
2438 */
2439
2440static void addrconf_ip6_tnl_config(struct net_device *dev)
2441{
2442 struct inet6_dev *idev;
2443
2444 ASSERT_RTNL();
2445
2446 if ((idev = addrconf_add_dev(dev)) == NULL) {
2447 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2448 return;
2449 }
2450 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2451}
2452
1ab1457c 2453static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2454 void * data)
2455{
2456 struct net_device *dev = (struct net_device *) data;
74235a25 2457 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2458 int run_pending = 0;
b217d616 2459 int err;
1da177e4
LT		 2460
2461 switch(event) {
45ba9dd2 2462 case NETDEV_REGISTER:
74235a25 2463 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2464 idev = ipv6_add_dev(dev);
2465 if (!idev)
b217d616 2466 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2467 }
2468 break;
1da177e4 2469 case NETDEV_UP:
3c21edbd 2470 case NETDEV_CHANGE:
c2edacf8
JV		 2471 if (dev->flags & IFF_SLAVE)
2472 break;
2473
3c21edbd 2474 if (event == NETDEV_UP) {
f24e3d65 2475 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2476 /* device is not ready yet. */
2477 printk(KERN_INFO
2478 "ADDRCONF(NETDEV_UP): %s: "
2479 "link is not ready\n",
2480 dev->name);
2481 break;
2482 }
99081049 2483
d31c7b8f
EP		 2484 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2485 idev = ipv6_add_dev(dev);
2486
e3ec6cfc 2487 if (idev) {
99081049 2488 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2489 run_pending = 1;
2490 }
3c21edbd 2491 } else {
f24e3d65 2492 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2493 /* device is still not ready. */
2494 break;
2495 }
2496
2497 if (idev) {
2498 if (idev->if_flags & IF_READY) {
2499 /* device is already configured. */
2500 break;
2501 }
2502 idev->if_flags |= IF_READY;
2503 }
2504
2505 printk(KERN_INFO
2506 "ADDRCONF(NETDEV_CHANGE): %s: "
2507 "link becomes ready\n",
2508 dev->name);
2509
c5e33bdd 2510 run_pending = 1;
3c21edbd
YH		 2511 }
2512
1da177e4 2513 switch(dev->type) {
0be669bb 2514#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2515 case ARPHRD_SIT:
2516 addrconf_sit_config(dev);
2517 break;
0be669bb 2518#endif
1da177e4
LT		 2519 case ARPHRD_TUNNEL6:
2520 addrconf_ip6_tnl_config(dev);
2521 break;
2522 case ARPHRD_LOOPBACK:
2523 init_loopback(dev);
2524 break;
2525
2526 default:
2527 addrconf_dev_config(dev);
2528 break;
3ff50b79 2529 }
1da177e4 2530 if (idev) {
c5e33bdd
YH		 2531 if (run_pending)
2532 addrconf_dad_run(idev);
2533
1da177e4
LT		 2534 /* If the MTU changed during the interface down, when the
2535 interface up, the changed MTU must be reflected in the
2536 idev as well as routers.
2537 */
2538 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2539 rt6_mtu_change(dev, dev->mtu);
2540 idev->cnf.mtu6 = dev->mtu;
2541 }
2542 idev->tstamp = jiffies;
2543 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2544 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2545 stop IPv6 on this interface.
2546 */
2547 if (dev->mtu < IPV6_MIN_MTU)
2548 addrconf_ifdown(dev, event != NETDEV_DOWN);
2549 }
2550 break;
2551
2552 case NETDEV_CHANGEMTU:
d31c7b8f 2553 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2554 rt6_mtu_change(dev, dev->mtu);
2555 idev->cnf.mtu6 = dev->mtu;
2556 break;
2557 }
2558
d31c7b8f
EP		 2559 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2560 idev = ipv6_add_dev(dev);
2561 if (idev)
2562 break;
2563 }
2564
1da177e4
LT		 2565 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2566
2567 case NETDEV_DOWN:
2568 case NETDEV_UNREGISTER:
2569 /*
2570 * Remove all addresses from this interface.
2571 */
2572 addrconf_ifdown(dev, event != NETDEV_DOWN);
2573 break;
3c21edbd 2574
1da177e4 2575 case NETDEV_CHANGENAME:
1da177e4 2576 if (idev) {
5632c515 2577 snmp6_unregister_dev(idev);
408c4768 2578 addrconf_sysctl_unregister(idev);
f52295a9 2579 addrconf_sysctl_register(idev);
b217d616
HX		 2580 err = snmp6_register_dev(idev);
2581 if (err)
2582 return notifier_from_errno(err);
5632c515 2583 }
1da177e4 2584 break;
75c78500
MS		 2585 case NETDEV_BONDING_OLDTYPE:
2586 case NETDEV_BONDING_NEWTYPE:
2587 addrconf_bonding_change(dev, event);
2588 break;
3ff50b79 2589 }
1da177e4
LT		 2590
2591 return NOTIFY_OK;
2592}
2593
2594/*
2595 * addrconf module should be notified of a device going up
2596 */
2597static struct notifier_block ipv6_dev_notf = {
2598 .notifier_call = addrconf_notify,
2599 .priority = 0
2600};
2601
75c78500
MS		 2602static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2603{
2604 struct inet6_dev *idev;
2605 ASSERT_RTNL();
2606
2607 idev = __in6_dev_get(dev);
2608
2609 if (event == NETDEV_BONDING_NEWTYPE)
2610 ipv6_mc_remap(idev);
2611 else if (event == NETDEV_BONDING_OLDTYPE)
2612 ipv6_mc_unmap(idev);
2613}
2614
1da177e4
LT		 2615static int addrconf_ifdown(struct net_device *dev, int how)
2616{
2617 struct inet6_dev *idev;
2618 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2619 struct net *net = dev_net(dev);
1da177e4
LT		 2620 int i;
2621
2622 ASSERT_RTNL();
2623
f3db4851 2624 rt6_ifdown(net, dev);
1da177e4
LT		 2625 neigh_ifdown(&nd_tbl, dev);
2626
2627 idev = __in6_dev_get(dev);
2628 if (idev == NULL)
2629 return -ENODEV;
2630
2631 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2632 Do not dev_put!
1da177e4 2633 */
439e2385 2634 if (how) {
1da177e4 2635 idev->dead = 1;
8814c4b5
YH		 2636
2637 /* protected by rtnl_lock */
2638 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2639
2640 /* Step 1.5: remove snmp6 entry */
2641 snmp6_unregister_dev(idev);
2642
2643 }
2644
2645 /* Step 2: clear hash table */
2646 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2647 bifa = &inet6_addr_lst[i];
2648
2649 write_lock_bh(&addrconf_hash_lock);
2650 while ((ifa = *bifa) != NULL) {
dc2b99f7 2651 if (ifa->idev == idev &&
84e8b803 2652 (how || !(ifa->flags&IFA_F_PERMANENT) ||
2653 ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2654 *bifa = ifa->lst_next;
2655 ifa->lst_next = NULL;
84e8b803 2656 __in6_ifa_put(ifa);
1da177e4
LT		 2657 continue;
2658 }
2659 bifa = &ifa->lst_next;
2660 }
2661 write_unlock_bh(&addrconf_hash_lock);
2662 }
2663
2664 write_lock_bh(&idev->lock);
2665
2666 /* Step 3: clear flags for stateless addrconf */
439e2385 2667 if (!how)
3c21edbd 2668 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2669
2670 /* Step 4: clear address list */
2671#ifdef CONFIG_IPV6_PRIVACY
439e2385 2672 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2673 in6_dev_put(idev);
2674
2675 /* clear tempaddr list */
2676 while ((ifa = idev->tempaddr_list) != NULL) {
2677 idev->tempaddr_list = ifa->tmp_next;
2678 ifa->tmp_next = NULL;
2679 ifa->dead = 1;
2680 write_unlock_bh(&idev->lock);
2681 spin_lock_bh(&ifa->lock);
2682
2683 if (ifa->ifpub) {
2684 in6_ifa_put(ifa->ifpub);
2685 ifa->ifpub = NULL;
2686 }
2687 spin_unlock_bh(&ifa->lock);
2688 in6_ifa_put(ifa);
2689 write_lock_bh(&idev->lock);
2690 }
2691#endif
dc2b99f7 2692 bifa = &idev->addr_list;
2693 while ((ifa = *bifa) != NULL) {
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)) {
dc2b99f7 2701 bifa = &ifa->if_next;
2702
84e8b803 2703 /* If not doing DAD on this address, just keep it. */
2704 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2705 idev->cnf.accept_dad <= 0 ||
2706 (ifa->flags & IFA_F_NODAD))
2707 continue;
2708
2709 /* If it was tentative already, no need to notify */
2710 if (ifa->flags & IFA_F_TENTATIVE)
2711 continue;
2712
2713 /* Flag it for later restoration when link comes up */
2714 ifa->flags |= IFA_F_TENTATIVE;
2715 in6_ifa_hold(ifa);
dc2b99f7 2716 } else {
2717 *bifa = ifa->if_next;
2718 ifa->if_next = NULL;
dc2b99f7 2719 ifa->dead = 1;
84e8b803 2720 }
2721 write_unlock_bh(&idev->lock);
1da177e4 2722
84e8b803 2723 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2724 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2725 in6_ifa_put(ifa);
dc2b99f7 2726
84e8b803 2727 write_lock_bh(&idev->lock);
1da177e4
LT		 2728 }
2729 write_unlock_bh(&idev->lock);
2730
2731 /* Step 5: Discard multicast list */
2732
439e2385 2733 if (how)
1da177e4
LT		 2734 ipv6_mc_destroy_dev(idev);
2735 else
2736 ipv6_mc_down(idev);
2737
1da177e4 2738 idev->tstamp = jiffies;
1ab1457c 2739
1da177e4
LT		 2740 /* Shot the device (if unregistered) */
2741
439e2385 2742 if (how) {
408c4768 2743 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2744 neigh_parms_release(&nd_tbl, idev->nd_parms);
2745 neigh_ifdown(&nd_tbl, dev);
2746 in6_dev_put(idev);
2747 }
2748 return 0;
2749}
2750
2751static void addrconf_rs_timer(unsigned long data)
2752{
2753 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2754 struct inet6_dev *idev = ifp->idev;
1da177e4 2755
5b2a1953 2756 read_lock(&idev->lock);
2757 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2758 goto out;
2759
5b2a1953 2760 if (idev->cnf.forwarding)
2761 goto out;
2762
2763 /* Announcement received after solicitation was sent */
2764 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2765 goto out;
1da177e4
LT		 2766
2767 spin_lock(&ifp->lock);
5b2a1953 2768 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2769 /* The wait after the last probe can be shorter */
2770 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2771 (ifp->probes == idev->cnf.rtr_solicits) ?
2772 idev->cnf.rtr_solicit_delay :
2773 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2774 spin_unlock(&ifp->lock);
2775
5b2a1953 2776 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2777 } else {
2778 spin_unlock(&ifp->lock);
2779 /*
2780 * Note: we do not support deprecated "all on-link"
2781 * assumption any longer.
2782 */
2783 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2784 idev->dev->name);
1da177e4
LT		 2785 }
2786
2787out:
5b2a1953 2788 read_unlock(&idev->lock);
1da177e4
LT		 2789 in6_ifa_put(ifp);
2790}
2791
2792/*
2793 * Duplicate Address Detection
2794 */
3c21edbd
YH		 2795static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2796{
2797 unsigned long rand_num;
2798 struct inet6_dev *idev = ifp->idev;
2799
95c385b4
NH		 2800 if (ifp->flags & IFA_F_OPTIMISTIC)
2801 rand_num = 0;
2802 else
2803 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2804
3c21edbd
YH		 2805 ifp->probes = idev->cnf.dad_transmits;
2806 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2807}
2808
e431b8c0 2809static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2810{
2811 struct inet6_dev *idev = ifp->idev;
2812 struct net_device *dev = idev->dev;
1da177e4
LT		 2813
2814 addrconf_join_solict(dev, &ifp->addr);
2815
1da177e4 2816 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2817
2818 read_lock_bh(&idev->lock);
2819 if (ifp->dead)
2820 goto out;
1da177e4 2821
21809faf 2822 spin_lock(&ifp->lock);
1da177e4 2823 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2824 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2825 !(ifp->flags&IFA_F_TENTATIVE) ||
2826 ifp->flags & IFA_F_NODAD) {
cc411d0b 2827 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2828 spin_unlock(&ifp->lock);
1da177e4
LT		 2829 read_unlock_bh(&idev->lock);
2830
2831 addrconf_dad_completed(ifp);
2832 return;
2833 }
2834
6732bade 2835 if (!(idev->if_flags & IF_READY)) {
21809faf 2836 spin_unlock(&ifp->lock);
6732bade 2837 read_unlock_bh(&idev->lock);
3c21edbd 2838 /*
590a9887 2839 * If the device is not ready:
3c21edbd
YH		 2840 * - keep it tentative if it is a permanent address.
2841 * - otherwise, kill it.
2842 */
2843 in6_ifa_hold(ifp);
cc411d0b 2844 addrconf_dad_stop(ifp, 0);
6732bade 2845 return;
3c21edbd 2846 }
95c385b4
NH		 2847
2848 /*
2849 * Optimistic nodes can start receiving
2850 * Frames right away
2851 */
2852 if(ifp->flags & IFA_F_OPTIMISTIC)
2853 ip6_ins_rt(ifp->rt);
2854
6732bade 2855 addrconf_dad_kick(ifp);
21809faf 2856 spin_unlock(&ifp->lock);
1da177e4
LT		 2857out:
2858 read_unlock_bh(&idev->lock);
2859}
2860
2861static void addrconf_dad_timer(unsigned long data)
2862{
2863 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2864 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2865 struct in6_addr mcaddr;
2866
122e4519 2867 read_lock(&idev->lock);
2868 if (idev->dead || !(idev->if_flags & IF_READY)) {
2869 read_unlock(&idev->lock);
1da177e4
LT		 2870 goto out;
2871 }
21809faf 2872
2873 spin_lock(&ifp->lock);
1da177e4
LT		 2874 if (ifp->probes == 0) {
2875 /*
2876 * DAD was successful
2877 */
2878
cc411d0b 2879 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2880 spin_unlock(&ifp->lock);
122e4519 2881 read_unlock(&idev->lock);
1da177e4
LT		 2882
2883 addrconf_dad_completed(ifp);
2884
2885 goto out;
2886 }
2887
2888 ifp->probes--;
2889 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2890 spin_unlock(&ifp->lock);
122e4519 2891 read_unlock(&idev->lock);
1da177e4
LT		 2892
2893 /* send a neighbour solicitation for our addr */
1da177e4 2894 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2895 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2896out:
2897 in6_ifa_put(ifp);
2898}
2899
2900static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2901{
2902 struct net_device * dev = ifp->idev->dev;
2903
2904 /*
2905 * Configure the address for reception. Now it is valid.
2906 */
2907
2908 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2909
2910 /* If added prefix is link local and forwarding is off,
2911 start sending router solicitations.
2912 */
2913
2914 if (ifp->idev->cnf.forwarding == 0 &&
2915 ifp->idev->cnf.rtr_solicits > 0 &&
2916 (dev->flags&IFF_LOOPBACK) == 0 &&
2917 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2918 /*
2919 * If a host as already performed a random delay
2920 * [...] as part of DAD [...] there is no need
2921 * to delay again before sending the first RS
2922 */
f3ee4010 2923 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2924
2925 spin_lock_bh(&ifp->lock);
2926 ifp->probes = 1;
2927 ifp->idev->if_flags |= IF_RS_SENT;
2928 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2929 spin_unlock_bh(&ifp->lock);
2930 }
2931}
2932
c5e33bdd
YH		 2933static void addrconf_dad_run(struct inet6_dev *idev) {
2934 struct inet6_ifaddr *ifp;
2935
2936 read_lock_bh(&idev->lock);
2937 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
21809faf 2938 spin_lock(&ifp->lock);
c5e33bdd 2939 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2940 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2941 continue;
2942 }
21809faf 2943 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2944 addrconf_dad_kick(ifp);
2945 }
2946 read_unlock_bh(&idev->lock);
2947}
2948
1da177e4
LT		 2949#ifdef CONFIG_PROC_FS
2950struct if6_iter_state {
3c40090a 2951 struct seq_net_private p;
1da177e4
LT		 2952 int bucket;
2953};
2954
2955static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2956{
2957 struct inet6_ifaddr *ifa = NULL;
2958 struct if6_iter_state *state = seq->private;
1218854a 2959 struct net *net = seq_file_net(seq);
1da177e4
LT		 2960
2961 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2962 ifa = inet6_addr_lst[state->bucket];
3c40090a 2963
878628fb 2964 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2965 ifa = ifa->lst_next;
1da177e4
LT		 2966 if (ifa)
2967 break;
2968 }
2969 return ifa;
2970}
2971
2972static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2973{
2974 struct if6_iter_state *state = seq->private;
1218854a 2975 struct net *net = seq_file_net(seq);
1da177e4
LT		 2976
2977 ifa = ifa->lst_next;
2978try_again:
3c40090a 2979 if (ifa) {
878628fb 2980 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2981 ifa = ifa->lst_next;
2982 goto try_again;
2983 }
2984 }
2985
1da177e4
LT		 2986 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2987 ifa = inet6_addr_lst[state->bucket];
2988 goto try_again;
2989 }
3c40090a 2990
1da177e4
LT		 2991 return ifa;
2992}
2993
2994static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2995{
2996 struct inet6_ifaddr *ifa = if6_get_first(seq);
2997
2998 if (ifa)
2999 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3000 --pos;
3001 return pos ? NULL : ifa;
3002}
3003
3004static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 3005 __acquires(addrconf_hash_lock)
1da177e4
LT		 3006{
3007 read_lock_bh(&addrconf_hash_lock);
3008 return if6_get_idx(seq, *pos);
3009}
3010
3011static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3012{
3013 struct inet6_ifaddr *ifa;
3014
3015 ifa = if6_get_next(seq, v);
3016 ++*pos;
3017 return ifa;
3018}
3019
3020static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 3021 __releases(addrconf_hash_lock)
1da177e4
LT		 3022{
3023 read_unlock_bh(&addrconf_hash_lock);
3024}
3025
3026static int if6_seq_show(struct seq_file *seq, void *v)
3027{
3028 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3029 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3030 &ifp->addr,
1da177e4
LT		 3031 ifp->idev->dev->ifindex,
3032 ifp->prefix_len,
3033 ifp->scope,
3034 ifp->flags,
3035 ifp->idev->dev->name);
3036 return 0;
3037}
3038
56b3d975 3039static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3040 .start = if6_seq_start,
3041 .next = if6_seq_next,
3042 .show = if6_seq_show,
3043 .stop = if6_seq_stop,
3044};
3045
3046static int if6_seq_open(struct inode *inode, struct file *file)
3047{
3c40090a
DL		 3048 return seq_open_net(inode, file, &if6_seq_ops,
3049 sizeof(struct if6_iter_state));
1da177e4
LT		 3050}
3051
9a32144e 3052static const struct file_operations if6_fops = {
1da177e4
LT		 3053 .owner = THIS_MODULE,
3054 .open = if6_seq_open,
3055 .read = seq_read,
3056 .llseek = seq_lseek,
3c40090a 3057 .release = seq_release_net,
1da177e4
LT		 3058};
3059
2c8c1e72 3060static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3061{
3c40090a 3062 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3063 return -ENOMEM;
3064 return 0;
3065}
3066
2c8c1e72 3067static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3068{
3069 proc_net_remove(net, "if_inet6");
3070}
3071
3072static struct pernet_operations if6_proc_net_ops = {
3073 .init = if6_proc_net_init,
3074 .exit = if6_proc_net_exit,
3075};
3076
3077int __init if6_proc_init(void)
3078{
3079 return register_pernet_subsys(&if6_proc_net_ops);
3080}
3081
1da177e4
LT		 3082void if6_proc_exit(void)
3083{
3c40090a 3084 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3085}
3086#endif /* CONFIG_PROC_FS */
3087
59fbb3a6 3088#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3089/* Check if address is a home address configured on any interface. */
389f6612 3090int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3091{
3092 int ret = 0;
3093 struct inet6_ifaddr * ifp;
3094 u8 hash = ipv6_addr_hash(addr);
3095 read_lock_bh(&addrconf_hash_lock);
3096 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3097 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3098 continue;
caad295f 3099 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3100 (ifp->flags & IFA_F_HOMEADDRESS)) {
3101 ret = 1;
3102 break;
3103 }
3104 }
3105 read_unlock_bh(&addrconf_hash_lock);
3106 return ret;
3107}
3108#endif
3109
1da177e4
LT		 3110/*
3111 * Periodic address status verification
3112 */
3113
3114static void addrconf_verify(unsigned long foo)
3115{
3116 struct inet6_ifaddr *ifp;
3117 unsigned long now, next;
3118 int i;
3119
3120 spin_lock_bh(&addrconf_verify_lock);
3121 now = jiffies;
3122 next = now + ADDR_CHECK_FREQUENCY;
3123
3124 del_timer(&addr_chk_timer);
3125
3126 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3127
3128restart:
5d5780df 3129 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3130 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3131 unsigned long age;
3132#ifdef CONFIG_IPV6_PRIVACY
3133 unsigned long regen_advance;
3134#endif
3135
3136 if (ifp->flags & IFA_F_PERMANENT)
3137 continue;
3138
3139 spin_lock(&ifp->lock);
3140 age = (now - ifp->tstamp) / HZ;
3141
3142#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3143 regen_advance = ifp->idev->cnf.regen_max_retry *
3144 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3145 ifp->idev->nd_parms->retrans_time / HZ;
3146#endif
3147
8f27ebb9
YH		 3148 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3149 age >= ifp->valid_lft) {
1da177e4
LT		 3150 spin_unlock(&ifp->lock);
3151 in6_ifa_hold(ifp);
5d5780df 3152 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3153 ipv6_del_addr(ifp);
3154 goto restart;
8f27ebb9
YH		 3155 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3156 spin_unlock(&ifp->lock);
3157 continue;
1da177e4 3158 } else if (age >= ifp->prefered_lft) {
a1ed0526 3159 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3160 int deprecate = 0;
3161
3162 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3163 deprecate = 1;
3164 ifp->flags |= IFA_F_DEPRECATED;
3165 }
3166
3167 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3168 next = ifp->tstamp + ifp->valid_lft * HZ;
3169
3170 spin_unlock(&ifp->lock);
3171
3172 if (deprecate) {
3173 in6_ifa_hold(ifp);
5d5780df 3174 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3175
3176 ipv6_ifa_notify(0, ifp);
3177 in6_ifa_put(ifp);
3178 goto restart;
3179 }
3180#ifdef CONFIG_IPV6_PRIVACY
3181 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3182 !(ifp->flags&IFA_F_TENTATIVE)) {
3183 if (age >= ifp->prefered_lft - regen_advance) {
3184 struct inet6_ifaddr *ifpub = ifp->ifpub;
3185 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3186 next = ifp->tstamp + ifp->prefered_lft * HZ;
3187 if (!ifp->regen_count && ifpub) {
3188 ifp->regen_count++;
3189 in6_ifa_hold(ifp);
3190 in6_ifa_hold(ifpub);
3191 spin_unlock(&ifp->lock);
5d5780df 3192 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3193 spin_lock(&ifpub->lock);
3194 ifpub->regen_count = 0;
3195 spin_unlock(&ifpub->lock);
1da177e4
LT		 3196 ipv6_create_tempaddr(ifpub, ifp);
3197 in6_ifa_put(ifpub);
3198 in6_ifa_put(ifp);
3199 goto restart;
3200 }
3201 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3202 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3203 spin_unlock(&ifp->lock);
3204#endif
3205 } else {
3206 /* ifp->prefered_lft <= ifp->valid_lft */
3207 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3208 next = ifp->tstamp + ifp->prefered_lft * HZ;
3209 spin_unlock(&ifp->lock);
3210 }
3211 }
5d5780df 3212 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3213 }
3214
3215 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3216 add_timer(&addr_chk_timer);
3217 spin_unlock_bh(&addrconf_verify_lock);
3218}
3219
461d8837
TG		 3220static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3221{
3222 struct in6_addr *pfx = NULL;
3223
3224 if (addr)
3225 pfx = nla_data(addr);
3226
3227 if (local) {
3228 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3229 pfx = NULL;
3230 else
3231 pfx = nla_data(local);
3232 }
3233
3234 return pfx;
3235}
3236
ef7c79ed 3237static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3238 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3239 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3240 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3241};
3242
1da177e4
LT		 3243static int
3244inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3245{
3b1e0a65 3246 struct net *net = sock_net(skb->sk);
b933f716
TG		 3247 struct ifaddrmsg *ifm;
3248 struct nlattr *tb[IFA_MAX+1];
1da177e4 3249 struct in6_addr *pfx;
b933f716 3250 int err;
1da177e4 3251
b933f716
TG		 3252 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3253 if (err < 0)
3254 return err;
3255
3256 ifm = nlmsg_data(nlh);
3257 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3258 if (pfx == NULL)
3259 return -EINVAL;
3260
af284937 3261 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3262}
3263
55ebaef1
NT		 3264static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3265 u32 prefered_lft, u32 valid_lft)
081bba5b 3266{
6f704992
YH		 3267 u32 flags;
3268 clock_t expires;
4bed72e4 3269 unsigned long timeout;
46d48046 3270
081bba5b
NT		 3271 if (!valid_lft || (prefered_lft > valid_lft))
3272 return -EINVAL;
3273
4bed72e4
YH		 3274 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3275 if (addrconf_finite_timeout(timeout)) {
3276 expires = jiffies_to_clock_t(timeout * HZ);
3277 valid_lft = timeout;
6f704992 3278 flags = RTF_EXPIRES;
4bed72e4
YH		 3279 } else {
3280 expires = 0;
3281 flags = 0;
3282 ifa_flags |= IFA_F_PERMANENT;
6f704992 3283 }
081bba5b 3284
4bed72e4
YH		 3285 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3286 if (addrconf_finite_timeout(timeout)) {
3287 if (timeout == 0)
3288 ifa_flags |= IFA_F_DEPRECATED;
3289 prefered_lft = timeout;
3290 }
081bba5b
NT		 3291
3292 spin_lock_bh(&ifp->lock);
3b9f9a1c 3293 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3294 ifp->tstamp = jiffies;
3295 ifp->valid_lft = valid_lft;
3296 ifp->prefered_lft = prefered_lft;
3297
3298 spin_unlock_bh(&ifp->lock);
3299 if (!(ifp->flags&IFA_F_TENTATIVE))
3300 ipv6_ifa_notify(0, ifp);
081bba5b 3301
46d48046 3302 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3303 expires, flags);
081bba5b
NT		 3304 addrconf_verify(0);
3305
3306 return 0;
3307}
3308
1da177e4
LT		 3309static int
3310inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3311{
3b1e0a65 3312 struct net *net = sock_net(skb->sk);
461d8837
TG		 3313 struct ifaddrmsg *ifm;
3314 struct nlattr *tb[IFA_MAX+1];
1da177e4 3315 struct in6_addr *pfx;
7198f8ce
TG		 3316 struct inet6_ifaddr *ifa;
3317 struct net_device *dev;
55ebaef1
NT		 3318 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3319 u8 ifa_flags;
461d8837 3320 int err;
1da177e4 3321
461d8837
TG		 3322 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3323 if (err < 0)
3324 return err;
3325
3326 ifm = nlmsg_data(nlh);
3327 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3328 if (pfx == NULL)
3329 return -EINVAL;
3330
461d8837 3331 if (tb[IFA_CACHEINFO]) {
0778769d 3332 struct ifa_cacheinfo *ci;
461d8837
TG		 3333
3334 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3335 valid_lft = ci->ifa_valid;
461d8837
TG		 3336 preferred_lft = ci->ifa_prefered;
3337 } else {
3338 preferred_lft = INFINITY_LIFE_TIME;
3339 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3340 }
3341
af284937 3342 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3343 if (dev == NULL)
3344 return -ENODEV;
3345
55ebaef1 3346 /* We ignore other flags so far. */
3b9f9a1c 3347 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3348
1cab3da6 3349 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3350 if (ifa == NULL) {
3351 /*
3352 * It would be best to check for !NLM_F_CREATE here but
3353 * userspace alreay relies on not having to provide this.
3354 */
af284937
DL		 3355 return inet6_addr_add(net, ifm->ifa_index, pfx,
3356 ifm->ifa_prefixlen, ifa_flags,
3357 preferred_lft, valid_lft);
081bba5b
NT		 3358 }
3359
7198f8ce
TG		 3360 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3361 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3362 err = -EEXIST;
3363 else
55ebaef1 3364 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3365
3366 in6_ifa_put(ifa);
3367
3368 return err;
1da177e4
LT		 3369}
3370
101bb229
TG		 3371static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3372 u8 scope, int ifindex)
3373{
3374 struct ifaddrmsg *ifm;
3375
3376 ifm = nlmsg_data(nlh);
3377 ifm->ifa_family = AF_INET6;
3378 ifm->ifa_prefixlen = prefixlen;
3379 ifm->ifa_flags = flags;
3380 ifm->ifa_scope = scope;
3381 ifm->ifa_index = ifindex;
3382}
3383
85486af0
TG		 3384static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3385 unsigned long tstamp, u32 preferred, u32 valid)
3386{
3387 struct ifa_cacheinfo ci;
3388
3389 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3390 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3391 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3392 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3393 ci.ifa_prefered = preferred;
3394 ci.ifa_valid = valid;
3395
3396 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3397}
3398
101bb229
TG		 3399static inline int rt_scope(int ifa_scope)
3400{
3401 if (ifa_scope & IFA_HOST)
3402 return RT_SCOPE_HOST;
3403 else if (ifa_scope & IFA_LINK)
3404 return RT_SCOPE_LINK;
3405 else if (ifa_scope & IFA_SITE)
3406 return RT_SCOPE_SITE;
3407 else
3408 return RT_SCOPE_UNIVERSE;
3409}
3410
0ab6803b
TG		 3411static inline int inet6_ifaddr_msgsize(void)
3412{
339bf98f
TG		 3413 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3414 + nla_total_size(16) /* IFA_ADDRESS */
3415 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3416}
c5396a31 3417
1da177e4 3418static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3419 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3420{
1da177e4 3421 struct nlmsghdr *nlh;
85486af0 3422 u32 preferred, valid;
1da177e4 3423
0ab6803b
TG		 3424 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3425 if (nlh == NULL)
26932566 3426 return -EMSGSIZE;
0ab6803b 3427
101bb229
TG		 3428 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3429 ifa->idev->dev->ifindex);
3430
1da177e4 3431 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3432 preferred = ifa->prefered_lft;
3433 valid = ifa->valid_lft;
3434 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3435 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3436 if (preferred > tval)
3437 preferred -= tval;
3438 else
3439 preferred = 0;
85486af0
TG		 3440 if (valid != INFINITY_LIFE_TIME)
3441 valid -= tval;
1da177e4
LT		 3442 }
3443 } else {
85486af0
TG		 3444 preferred = INFINITY_LIFE_TIME;
3445 valid = INFINITY_LIFE_TIME;
3446 }
3447
0ab6803b 3448 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3449 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3450 nlmsg_cancel(skb, nlh);
3451 return -EMSGSIZE;
3452 }
1da177e4 3453
0ab6803b 3454 return nlmsg_end(skb, nlh);
1da177e4
LT		 3455}
3456
3457static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3458 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3459{
1da177e4 3460 struct nlmsghdr *nlh;
101bb229
TG		 3461 u8 scope = RT_SCOPE_UNIVERSE;
3462 int ifindex = ifmca->idev->dev->ifindex;
3463
3464 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3465 scope = RT_SCOPE_SITE;
1da177e4 3466
0ab6803b
TG		 3467 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3468 if (nlh == NULL)
26932566 3469 return -EMSGSIZE;
85486af0 3470
0ab6803b
TG		 3471 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3472 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3473 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3474 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3475 nlmsg_cancel(skb, nlh);
3476 return -EMSGSIZE;
3477 }
85486af0 3478
0ab6803b 3479 return nlmsg_end(skb, nlh);
1da177e4
LT		 3480}
3481
3482static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3483 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3484{
1da177e4 3485 struct nlmsghdr *nlh;
101bb229
TG		 3486 u8 scope = RT_SCOPE_UNIVERSE;
3487 int ifindex = ifaca->aca_idev->dev->ifindex;
3488
3489 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3490 scope = RT_SCOPE_SITE;
1da177e4 3491
0ab6803b
TG		 3492 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3493 if (nlh == NULL)
26932566 3494 return -EMSGSIZE;
85486af0 3495
0ab6803b
TG		 3496 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3497 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3498 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3499 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3500 nlmsg_cancel(skb, nlh);
3501 return -EMSGSIZE;
3502 }
1da177e4 3503
0ab6803b 3504 return nlmsg_end(skb, nlh);
1da177e4
LT		 3505}
3506
3507enum addr_type_t
3508{
3509 UNICAST_ADDR,
3510 MULTICAST_ADDR,
3511 ANYCAST_ADDR,
3512};
3513
234b27c3
ED		 3514/* called with rcu_read_lock() */
3515static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3516 struct netlink_callback *cb, enum addr_type_t type,
3517 int s_ip_idx, int *p_ip_idx)
3518{
3519 struct inet6_ifaddr *ifa;
3520 struct ifmcaddr6 *ifmca;
3521 struct ifacaddr6 *ifaca;
3522 int err = 1;
3523 int ip_idx = *p_ip_idx;
3524
3525 read_lock_bh(&idev->lock);
3526 switch (type) {
3527 case UNICAST_ADDR:
3528 /* unicast address incl. temp addr */
3529 for (ifa = idev->addr_list; ifa;
3530 ifa = ifa->if_next, ip_idx++) {
3531 if (ip_idx < s_ip_idx)
3532 continue;
3533 err = inet6_fill_ifaddr(skb, ifa,
3534 NETLINK_CB(cb->skb).pid,
3535 cb->nlh->nlmsg_seq,
3536 RTM_NEWADDR,
3537 NLM_F_MULTI);
3538 if (err <= 0)
3539 break;
3540 }
3541 break;
3542 case MULTICAST_ADDR:
3543 /* multicast address */
3544 for (ifmca = idev->mc_list; ifmca;
3545 ifmca = ifmca->next, ip_idx++) {
3546 if (ip_idx < s_ip_idx)
3547 continue;
3548 err = inet6_fill_ifmcaddr(skb, ifmca,
3549 NETLINK_CB(cb->skb).pid,
3550 cb->nlh->nlmsg_seq,
3551 RTM_GETMULTICAST,
3552 NLM_F_MULTI);
3553 if (err <= 0)
3554 break;
3555 }
3556 break;
3557 case ANYCAST_ADDR:
3558 /* anycast address */
3559 for (ifaca = idev->ac_list; ifaca;
3560 ifaca = ifaca->aca_next, ip_idx++) {
3561 if (ip_idx < s_ip_idx)
3562 continue;
3563 err = inet6_fill_ifacaddr(skb, ifaca,
3564 NETLINK_CB(cb->skb).pid,
3565 cb->nlh->nlmsg_seq,
3566 RTM_GETANYCAST,
3567 NLM_F_MULTI);
3568 if (err <= 0)
3569 break;
3570 }
3571 break;
3572 default:
3573 break;
3574 }
3575 read_unlock_bh(&idev->lock);
3576 *p_ip_idx = ip_idx;
3577 return err;
3578}
3579
1da177e4
LT		 3580static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3581 enum addr_type_t type)
3582{
234b27c3
ED		 3583 struct net *net = sock_net(skb->sk);
3584 int h, s_h;
1da177e4
LT		 3585 int idx, ip_idx;
3586 int s_idx, s_ip_idx;
1da177e4 3587 struct net_device *dev;
234b27c3
ED		 3588 struct inet6_dev *idev;
3589 struct hlist_head *head;
3590 struct hlist_node *node;
1ab1457c 3591
234b27c3
ED		 3592 s_h = cb->args[0];
3593 s_idx = idx = cb->args[1];
3594 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3595
234b27c3
ED		 3596 rcu_read_lock();
3597 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3598 idx = 0;
3599 head = &net->dev_index_head[h];
3600 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3601 if (idx < s_idx)
3602 goto cont;
3603 if (idx > s_idx)
3604 s_ip_idx = 0;
3605 ip_idx = 0;
3606 if ((idev = __in6_dev_get(dev)) == NULL)
3607 goto cont;
3608
3609 if (in6_dump_addrs(idev, skb, cb, type,
3610 s_ip_idx, &ip_idx) <= 0)
3611 goto done;
7562f876 3612cont:
234b27c3
ED		 3613 idx++;
3614 }
1da177e4 3615 }
234b27c3
ED		 3616done:
3617 rcu_read_unlock();
3618 cb->args[0] = h;
3619 cb->args[1] = idx;
3620 cb->args[2] = ip_idx;
3621
1da177e4
LT		 3622 return skb->len;
3623}
3624
3625static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3626{
3627 enum addr_type_t type = UNICAST_ADDR;
b854272b 3628
1da177e4
LT		 3629 return inet6_dump_addr(skb, cb, type);
3630}
3631
3632static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3633{
3634 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3635
1da177e4
LT		 3636 return inet6_dump_addr(skb, cb, type);
3637}
3638
3639
3640static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3641{
3642 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3643
1da177e4
LT		 3644 return inet6_dump_addr(skb, cb, type);
3645}
3646
1b29fc2c
TG		 3647static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3648 void *arg)
6c223828 3649{
3b1e0a65 3650 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3651 struct ifaddrmsg *ifm;
3652 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3653 struct in6_addr *addr = NULL;
3654 struct net_device *dev = NULL;
3655 struct inet6_ifaddr *ifa;
3656 struct sk_buff *skb;
6c223828
NT		 3657 int err;
3658
1b29fc2c
TG		 3659 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3660 if (err < 0)
3661 goto errout;
3662
3663 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3664 if (addr == NULL) {
3665 err = -EINVAL;
3666 goto errout;
6c223828 3667 }
6c223828 3668
1b29fc2c 3669 ifm = nlmsg_data(nlh);
6c223828 3670 if (ifm->ifa_index)
6fda7350 3671 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3672
1cab3da6 3673 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3674 err = -EADDRNOTAVAIL;
3675 goto errout;
3676 }
6c223828 3677
0ab6803b 3678 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3679 err = -ENOBUFS;
1b29fc2c 3680 goto errout_ifa;
6c223828
NT		 3681 }
3682
6c223828
NT		 3683 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3684 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3685 if (err < 0) {
3686 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3687 WARN_ON(err == -EMSGSIZE);
3688 kfree_skb(skb);
3689 goto errout_ifa;
3690 }
6fda7350 3691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3692errout_ifa:
6c223828 3693 in6_ifa_put(ifa);
1b29fc2c 3694errout:
6c223828 3695 return err;
6c223828
NT		 3696}
3697
1da177e4
LT		 3698static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3699{
3700 struct sk_buff *skb;
c346dca1 3701 struct net *net = dev_net(ifa->idev->dev);
5d620266 3702 int err = -ENOBUFS;
1da177e4 3703
0ab6803b 3704 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3705 if (skb == NULL)
3706 goto errout;
3707
3708 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3709 if (err < 0) {
3710 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3711 WARN_ON(err == -EMSGSIZE);
3712 kfree_skb(skb);
3713 goto errout;
3714 }
1ce85fe4
PNA		 3715 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3716 return;
5d620266
TG		 3717errout:
3718 if (err < 0)
6fda7350 3719 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3720}
3721
b6f99a21 3722static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3723 __s32 *array, int bytes)
3724{
04561c1f
TG		 3725 BUG_ON(bytes < (DEVCONF_MAX * 4));
3726
1da177e4
LT		 3727 memset(array, 0, bytes);
3728 array[DEVCONF_FORWARDING] = cnf->forwarding;
3729 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3730 array[DEVCONF_MTU6] = cnf->mtu6;
3731 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3732 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3733 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3734 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3735 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3736 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3737 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3738 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3739#ifdef CONFIG_IPV6_PRIVACY
3740 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3741 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3742 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3743 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3744 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3745#endif
3746 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3747 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3748 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3749#ifdef CONFIG_IPV6_ROUTER_PREF
3750 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3751 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3752#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3753 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3754#endif
930d6ff2 3755#endif
fbea49e1 3756 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3757 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3758#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3759 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3760#endif
7bc570c8
YH		 3761#ifdef CONFIG_IPV6_MROUTE
3762 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3763#endif
778d80be 3764 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3765 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3766 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3767}
3768
339bf98f
TG		 3769static inline size_t inet6_if_nlmsg_size(void)
3770{
3771 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3772 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3773 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3774 + nla_total_size(4) /* IFLA_MTU */
3775 + nla_total_size(4) /* IFLA_LINK */
3776 + nla_total_size( /* IFLA_PROTINFO */
3777 nla_total_size(4) /* IFLA_INET6_FLAGS */
3778 + nla_total_size(sizeof(struct ifla_cacheinfo))
3779 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3780 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3781 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3782 );
3783}
c5396a31 3784
7d720c3e
TH		 3785static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3786 int items, int bytes)
7f7d9a6b
HX		 3787{
3788 int i;
3789 int pad = bytes - sizeof(u64) * items;
3790 BUG_ON(pad < 0);
3791
3792 /* Use put_unaligned() because stats may not be aligned for u64. */
3793 put_unaligned(items, &stats[0]);
3794 for (i = 1; i < items; i++)
3795 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3796
3797 memset(&stats[items], 0, pad);
3798}
3799
3800static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3801 int bytes)
3802{
3803 switch(attrtype) {
3804 case IFLA_INET6_STATS:
7d720c3e 3805 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3806 break;
3807 case IFLA_INET6_ICMP6STATS:
7d720c3e 3808 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3809 break;
3810 }
3811}
3812
1ab1457c 3813static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3814 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3815{
04561c1f 3816 struct net_device *dev = idev->dev;
bf99f1bd 3817 struct nlattr *nla;
04561c1f
TG		 3818 struct ifinfomsg *hdr;
3819 struct nlmsghdr *nlh;
3820 void *protoinfo;
3821 struct ifla_cacheinfo ci;
3822
3823 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3824 if (nlh == NULL)
26932566 3825 return -EMSGSIZE;
04561c1f
TG		 3826
3827 hdr = nlmsg_data(nlh);
3828 hdr->ifi_family = AF_INET6;
3829 hdr->__ifi_pad = 0;
3830 hdr->ifi_type = dev->type;
3831 hdr->ifi_index = dev->ifindex;
3832 hdr->ifi_flags = dev_get_flags(dev);
3833 hdr->ifi_change = 0;
3834
3835 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3836
3837 if (dev->addr_len)
04561c1f 3838 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3839
04561c1f 3840 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3841 if (dev->ifindex != dev->iflink)
04561c1f 3842 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3843
04561c1f
TG		 3844 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3845 if (protoinfo == NULL)
3846 goto nla_put_failure;
1da177e4 3847
04561c1f 3848 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3849
1da177e4
LT		 3850 ci.max_reasm_len = IPV6_MAXPLEN;
3851 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3852 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3853 ci.reachable_time = idev->nd_parms->reachable_time;
3854 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3855 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3856
bf99f1bd
YH		 3857 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3858 if (nla == NULL)
04561c1f 3859 goto nla_put_failure;
bf99f1bd 3860 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3861
bf99f1bd
YH		 3862 /* XXX - MC not implemented */
3863
3864 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3865 if (nla == NULL)
3866 goto nla_put_failure;
3867 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3868
3869 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3870 if (nla == NULL)
3871 goto nla_put_failure;
3872 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3873
04561c1f
TG		 3874 nla_nest_end(skb, protoinfo);
3875 return nlmsg_end(skb, nlh);
1da177e4 3876
04561c1f 3877nla_put_failure:
26932566
PM		 3878 nlmsg_cancel(skb, nlh);
3879 return -EMSGSIZE;
1da177e4
LT		 3880}
3881
3882static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3883{
3b1e0a65 3884 struct net *net = sock_net(skb->sk);
84d2697d 3885 int h, s_h;
434a8a58 3886 int idx = 0, s_idx;
1da177e4
LT		 3887 struct net_device *dev;
3888 struct inet6_dev *idev;
84d2697d
ED		 3889 struct hlist_head *head;
3890 struct hlist_node *node;
1da177e4 3891
84d2697d
ED		 3892 s_h = cb->args[0];
3893 s_idx = cb->args[1];
3894
3895 rcu_read_lock();
3896 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3897 idx = 0;
3898 head = &net->dev_index_head[h];
3899 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3900 if (idx < s_idx)
3901 goto cont;
3902 idev = __in6_dev_get(dev);
3903 if (!idev)
3904 goto cont;
3905 if (inet6_fill_ifinfo(skb, idev,
3906 NETLINK_CB(cb->skb).pid,
3907 cb->nlh->nlmsg_seq,
3908 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3909 goto out;
7562f876 3910cont:
84d2697d
ED		 3911 idx++;
3912 }
1da177e4 3913 }
84d2697d
ED		 3914out:
3915 rcu_read_unlock();
3916 cb->args[1] = idx;
3917 cb->args[0] = h;
1da177e4
LT		 3918
3919 return skb->len;
3920}
3921
3922void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3923{
3924 struct sk_buff *skb;
c346dca1 3925 struct net *net = dev_net(idev->dev);
8d7a76c9 3926 int err = -ENOBUFS;
1ab1457c 3927
339bf98f 3928 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3929 if (skb == NULL)
3930 goto errout;
3931
3932 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3933 if (err < 0) {
3934 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3935 WARN_ON(err == -EMSGSIZE);
3936 kfree_skb(skb);
3937 goto errout;
3938 }
1ce85fe4
PNA		 3939 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3940 return;
8d7a76c9
TG		 3941errout:
3942 if (err < 0)
6fda7350 3943 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3944}
3945
339bf98f
TG		 3946static inline size_t inet6_prefix_nlmsg_size(void)
3947{
3948 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3949 + nla_total_size(sizeof(struct in6_addr))
3950 + nla_total_size(sizeof(struct prefix_cacheinfo));
3951}
c5396a31 3952
1da177e4 3953static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3954 struct prefix_info *pinfo, u32 pid, u32 seq,
3955 int event, unsigned int flags)
1da177e4 3956{
6051e2f4
TG		 3957 struct prefixmsg *pmsg;
3958 struct nlmsghdr *nlh;
1da177e4
LT		 3959 struct prefix_cacheinfo ci;
3960
6051e2f4
TG		 3961 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3962 if (nlh == NULL)
26932566 3963 return -EMSGSIZE;
6051e2f4
TG		 3964
3965 pmsg = nlmsg_data(nlh);
1da177e4 3966 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3967 pmsg->prefix_pad1 = 0;
3968 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3969 pmsg->prefix_ifindex = idev->dev->ifindex;
3970 pmsg->prefix_len = pinfo->prefix_len;
3971 pmsg->prefix_type = pinfo->type;
8a47077a 3972 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3973 pmsg->prefix_flags = 0;
3974 if (pinfo->onlink)
3975 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3976 if (pinfo->autoconf)
3977 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3978
6051e2f4 3979 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3980
3981 ci.preferred_time = ntohl(pinfo->prefered);
3982 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3983 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3984
6051e2f4 3985 return nlmsg_end(skb, nlh);
1da177e4 3986
6051e2f4 3987nla_put_failure:
26932566
PM		 3988 nlmsg_cancel(skb, nlh);
3989 return -EMSGSIZE;
1da177e4
LT		 3990}
3991
1ab1457c 3992static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3993 struct prefix_info *pinfo)
3994{
3995 struct sk_buff *skb;
c346dca1 3996 struct net *net = dev_net(idev->dev);
8c384bfa 3997 int err = -ENOBUFS;
1da177e4 3998
339bf98f 3999 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4000 if (skb == NULL)
4001 goto errout;
4002
4003 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4004 if (err < 0) {
4005 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4006 WARN_ON(err == -EMSGSIZE);
4007 kfree_skb(skb);
4008 goto errout;
4009 }
1ce85fe4
PNA		 4010 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4011 return;
8c384bfa
TG		 4012errout:
4013 if (err < 0)
6fda7350 4014 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4015}
4016
1da177e4
LT		 4017static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4018{
4019 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4020
4021 switch (event) {
4022 case RTM_NEWADDR:
95c385b4
NH		 4023 /*
4024 * If the address was optimistic
4025 * we inserted the route at the start of
4026 * our DAD process, so we don't need
4027 * to do it again
4028 */
4029 if (!(ifp->rt->rt6i_node))
4030 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4031 if (ifp->idev->cnf.forwarding)
4032 addrconf_join_anycast(ifp);
4033 break;
4034 case RTM_DELADDR:
4035 if (ifp->idev->cnf.forwarding)
4036 addrconf_leave_anycast(ifp);
4037 addrconf_leave_solict(ifp->idev, &ifp->addr);
4038 dst_hold(&ifp->rt->u.dst);
e0a1ad73 4039 if (ip6_del_rt(ifp->rt))
1da177e4 4040 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4041 break;
4042 }
4043}
4044
4045static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4046{
8814c4b5 4047 rcu_read_lock_bh();
1da177e4
LT		 4048 if (likely(ifp->idev->dead == 0))
4049 __ipv6_ifa_notify(event, ifp);
8814c4b5 4050 rcu_read_unlock_bh();
1da177e4
LT		 4051}
4052
4053#ifdef CONFIG_SYSCTL
4054
4055static
8d65af78 4056int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4057 void __user *buffer, size_t *lenp, loff_t *ppos)
4058{
4059 int *valp = ctl->data;
4060 int val = *valp;
88af182e 4061 loff_t pos = *ppos;
1da177e4
LT		 4062 int ret;
4063
8d65af78 4064 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4065
c8fecf22 4066 if (write)
b325fddb 4067 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4068 if (ret)
4069 *ppos = pos;
1ab1457c 4070 return ret;
1da177e4
LT		 4071}
4072
56d417b1
BH		 4073static void dev_disable_change(struct inet6_dev *idev)
4074{
4075 if (!idev || !idev->dev)
4076 return;
4077
4078 if (idev->cnf.disable_ipv6)
4079 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4080 else
4081 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4082}
4083
4084static void addrconf_disable_change(struct net *net, __s32 newf)
4085{
4086 struct net_device *dev;
4087 struct inet6_dev *idev;
4088
c6d14c84
ED		 4089 rcu_read_lock();
4090 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4091 idev = __in6_dev_get(dev);
4092 if (idev) {
4093 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4094 idev->cnf.disable_ipv6 = newf;
4095 if (changed)
4096 dev_disable_change(idev);
4097 }
56d417b1 4098 }
c6d14c84 4099 rcu_read_unlock();
56d417b1
BH		 4100}
4101
4102static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4103{
4104 struct net *net;
4105
4106 net = (struct net *)table->extra2;
4107
4108 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4109 return 0;
4110
88af182e
EB		 4111 if (!rtnl_trylock()) {
4112 /* Restore the original values before restarting */
4113 *p = old;
56d417b1 4114 return restart_syscall();
88af182e 4115 }
56d417b1
BH		 4116
4117 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4118 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4119 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4120 addrconf_disable_change(net, newf);
4121 } else if ((!*p) ^ (!old))
4122 dev_disable_change((struct inet6_dev *)table->extra1);
4123
4124 rtnl_unlock();
4125 return 0;
4126}
4127
4128static
8d65af78 4129int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4130 void __user *buffer, size_t *lenp, loff_t *ppos)
4131{
4132 int *valp = ctl->data;
4133 int val = *valp;
88af182e 4134 loff_t pos = *ppos;
56d417b1
BH		 4135 int ret;
4136
8d65af78 4137 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4138
4139 if (write)
4140 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4141 if (ret)
4142 *ppos = pos;
56d417b1
BH		 4143 return ret;
4144}
4145
1da177e4
LT		 4146static struct addrconf_sysctl_table
4147{
4148 struct ctl_table_header *sysctl_header;
f6a07b29 4149 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4150 char *dev_name;
ab32ea5d 4151} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4152 .sysctl_header = NULL,
4153 .addrconf_vars = {
1ab1457c 4154 {
1da177e4 4155 .procname = "forwarding",
1ab1457c 4156 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4157 .maxlen = sizeof(int),
4158 .mode = 0644,
6d9f239a 4159 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4160 },
4161 {
1da177e4 4162 .procname = "hop_limit",
1ab1457c 4163 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4164 .maxlen = sizeof(int),
4165 .mode = 0644,
4166 .proc_handler = proc_dointvec,
4167 },
4168 {
1da177e4
LT		 4169 .procname = "mtu",
4170 .data = &ipv6_devconf.mtu6,
1ab1457c 4171 .maxlen = sizeof(int),
1da177e4 4172 .mode = 0644,
6d9f239a 4173 .proc_handler = proc_dointvec,
1da177e4
LT		 4174 },
4175 {
1da177e4 4176 .procname = "accept_ra",
1ab1457c 4177 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4178 .maxlen = sizeof(int),
4179 .mode = 0644,
6d9f239a 4180 .proc_handler = proc_dointvec,
1da177e4
LT		 4181 },
4182 {
1da177e4 4183 .procname = "accept_redirects",
1ab1457c 4184 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4185 .maxlen = sizeof(int),
4186 .mode = 0644,
6d9f239a 4187 .proc_handler = proc_dointvec,
1da177e4
LT		 4188 },
4189 {
1da177e4 4190 .procname = "autoconf",
1ab1457c 4191 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4192 .maxlen = sizeof(int),
4193 .mode = 0644,
6d9f239a 4194 .proc_handler = proc_dointvec,
1da177e4
LT		 4195 },
4196 {
1da177e4 4197 .procname = "dad_transmits",
1ab1457c 4198 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4199 .maxlen = sizeof(int),
4200 .mode = 0644,
6d9f239a 4201 .proc_handler = proc_dointvec,
1da177e4
LT		 4202 },
4203 {
1da177e4 4204 .procname = "router_solicitations",
1ab1457c 4205 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4206 .maxlen = sizeof(int),
4207 .mode = 0644,
6d9f239a 4208 .proc_handler = proc_dointvec,
1da177e4
LT		 4209 },
4210 {
1da177e4 4211 .procname = "router_solicitation_interval",
1ab1457c 4212 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4213 .maxlen = sizeof(int),
4214 .mode = 0644,
6d9f239a 4215 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4216 },
4217 {
1da177e4 4218 .procname = "router_solicitation_delay",
1ab1457c 4219 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4220 .maxlen = sizeof(int),
4221 .mode = 0644,
6d9f239a 4222 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4223 },
4224 {
1da177e4 4225 .procname = "force_mld_version",
1ab1457c 4226 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4227 .maxlen = sizeof(int),
4228 .mode = 0644,
6d9f239a 4229 .proc_handler = proc_dointvec,
1da177e4
LT		 4230 },
4231#ifdef CONFIG_IPV6_PRIVACY
4232 {
1da177e4 4233 .procname = "use_tempaddr",
1ab1457c 4234 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4235 .maxlen = sizeof(int),
4236 .mode = 0644,
6d9f239a 4237 .proc_handler = proc_dointvec,
1da177e4
LT		 4238 },
4239 {
1da177e4 4240 .procname = "temp_valid_lft",
1ab1457c 4241 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4242 .maxlen = sizeof(int),
4243 .mode = 0644,
6d9f239a 4244 .proc_handler = proc_dointvec,
1da177e4
LT		 4245 },
4246 {
1da177e4 4247 .procname = "temp_prefered_lft",
1ab1457c 4248 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4249 .maxlen = sizeof(int),
4250 .mode = 0644,
6d9f239a 4251 .proc_handler = proc_dointvec,
1da177e4
LT		 4252 },
4253 {
1da177e4 4254 .procname = "regen_max_retry",
1ab1457c 4255 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4256 .maxlen = sizeof(int),
4257 .mode = 0644,
6d9f239a 4258 .proc_handler = proc_dointvec,
1da177e4
LT		 4259 },
4260 {
1da177e4 4261 .procname = "max_desync_factor",
1ab1457c 4262 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4263 .maxlen = sizeof(int),
4264 .mode = 0644,
6d9f239a 4265 .proc_handler = proc_dointvec,
1da177e4
LT		 4266 },
4267#endif
4268 {
1da177e4
LT		 4269 .procname = "max_addresses",
4270 .data = &ipv6_devconf.max_addresses,
4271 .maxlen = sizeof(int),
4272 .mode = 0644,
6d9f239a 4273 .proc_handler = proc_dointvec,
1da177e4 4274 },
65f5c7c1 4275 {
65f5c7c1 4276 .procname = "accept_ra_defrtr",
1ab1457c 4277 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4278 .maxlen = sizeof(int),
4279 .mode = 0644,
6d9f239a 4280 .proc_handler = proc_dointvec,
65f5c7c1 4281 },
c4fd30eb 4282 {
c4fd30eb 4283 .procname = "accept_ra_pinfo",
1ab1457c 4284 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4285 .maxlen = sizeof(int),
4286 .mode = 0644,
6d9f239a 4287 .proc_handler = proc_dointvec,
c4fd30eb 4288 },
930d6ff2
YH		 4289#ifdef CONFIG_IPV6_ROUTER_PREF
4290 {
930d6ff2
YH		 4291 .procname = "accept_ra_rtr_pref",
4292 .data = &ipv6_devconf.accept_ra_rtr_pref,
4293 .maxlen = sizeof(int),
4294 .mode = 0644,
6d9f239a 4295 .proc_handler = proc_dointvec,
930d6ff2 4296 },
52e16356 4297 {
52e16356
YH		 4298 .procname = "router_probe_interval",
4299 .data = &ipv6_devconf.rtr_probe_interval,
4300 .maxlen = sizeof(int),
4301 .mode = 0644,
6d9f239a 4302 .proc_handler = proc_dointvec_jiffies,
52e16356 4303 },
fa03ef38 4304#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4305 {
09c884d4
YH		 4306 .procname = "accept_ra_rt_info_max_plen",
4307 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4308 .maxlen = sizeof(int),
4309 .mode = 0644,
6d9f239a 4310 .proc_handler = proc_dointvec,
09c884d4
YH		 4311 },
4312#endif
930d6ff2 4313#endif
fbea49e1 4314 {
fbea49e1
YH		 4315 .procname = "proxy_ndp",
4316 .data = &ipv6_devconf.proxy_ndp,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
6d9f239a 4319 .proc_handler = proc_dointvec,
fbea49e1 4320 },
0bcbc926 4321 {
0bcbc926
YH		 4322 .procname = "accept_source_route",
4323 .data = &ipv6_devconf.accept_source_route,
4324 .maxlen = sizeof(int),
4325 .mode = 0644,
6d9f239a 4326 .proc_handler = proc_dointvec,
0bcbc926 4327 },
95c385b4
NH		 4328#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4329 {
95c385b4
NH		 4330 .procname = "optimistic_dad",
4331 .data = &ipv6_devconf.optimistic_dad,
4332 .maxlen = sizeof(int),
4333 .mode = 0644,
6d9f239a 4334 .proc_handler = proc_dointvec,
95c385b4
NH		 4335
4336 },
7bc570c8
YH		 4337#endif
4338#ifdef CONFIG_IPV6_MROUTE
4339 {
7bc570c8
YH		 4340 .procname = "mc_forwarding",
4341 .data = &ipv6_devconf.mc_forwarding,
4342 .maxlen = sizeof(int),
a4e6db07 4343 .mode = 0444,
6d9f239a 4344 .proc_handler = proc_dointvec,
7bc570c8 4345 },
95c385b4 4346#endif
778d80be 4347 {
778d80be
YH		 4348 .procname = "disable_ipv6",
4349 .data = &ipv6_devconf.disable_ipv6,
4350 .maxlen = sizeof(int),
4351 .mode = 0644,
56d417b1 4352 .proc_handler = addrconf_sysctl_disable,
778d80be 4353 },
1b34be74 4354 {
1b34be74
YH		 4355 .procname = "accept_dad",
4356 .data = &ipv6_devconf.accept_dad,
4357 .maxlen = sizeof(int),
4358 .mode = 0644,
6d9f239a 4359 .proc_handler = proc_dointvec,
1b34be74 4360 },
f7734fdf 4361 {
f7734fdf
OP		 4362 .procname = "force_tllao",
4363 .data = &ipv6_devconf.force_tllao,
4364 .maxlen = sizeof(int),
4365 .mode = 0644,
4366 .proc_handler = proc_dointvec
4367 },
1da177e4 4368 {
f8572d8f 4369 /* sentinel */
1da177e4
LT		 4370 }
4371 },
1da177e4
LT		 4372};
4373
bff16c2f 4374static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4375 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4376{
4377 int i;
1da177e4 4378 struct addrconf_sysctl_table *t;
1da177e4 4379
1dab6222
PE		 4380#define ADDRCONF_CTL_PATH_DEV 3
4381
4382 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4383 { .procname = "net", },
4384 { .procname = "ipv6", },
4385 { .procname = "conf", },
1dab6222
PE		 4386 { /* to be set */ },
4387 { },
4388 };
4389
4390
af879cc7 4391 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4392 if (t == NULL)
f68635e6
PE		 4393 goto out;
4394
1da177e4
LT		 4395 for (i=0; t->addrconf_vars[i].data; i++) {
4396 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4397 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4398 t->addrconf_vars[i].extra2 = net;
1da177e4 4399 }
1da177e4 4400
1ab1457c
YH		 4401 /*
4402 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4403 * by sysctl and we wouldn't want anyone to change it under our feet
4404 * (see SIOCSIFNAME).
1ab1457c 4405 */
1dab6222
PE		 4406 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4407 if (!t->dev_name)
f68635e6 4408 goto free;
1da177e4 4409
1dab6222 4410 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4411
bff16c2f 4412 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4413 t->addrconf_vars);
1da177e4
LT		 4414 if (t->sysctl_header == NULL)
4415 goto free_procname;
f68635e6
PE		 4416
4417 p->sysctl = t;
95897312 4418 return 0;
1da177e4 4419
f68635e6 4420free_procname:
1dab6222 4421 kfree(t->dev_name);
f68635e6 4422free:
1da177e4 4423 kfree(t);
f68635e6 4424out:
95897312 4425 return -ENOBUFS;
1da177e4
LT		 4426}
4427
408c4768
PE		 4428static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4429{
4430 struct addrconf_sysctl_table *t;
4431
4432 if (p->sysctl == NULL)
4433 return;
4434
4435 t = p->sysctl;
4436 p->sysctl = NULL;
4437 unregister_sysctl_table(t->sysctl_header);
4438 kfree(t->dev_name);
4439 kfree(t);
4440}
4441
f52295a9
PE		 4442static void addrconf_sysctl_register(struct inet6_dev *idev)
4443{
54716e3b 4444 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4445 &ndisc_ifinfo_sysctl_change);
c346dca1 4446 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4447 idev, &idev->cnf);
f52295a9
PE		 4448}
4449
408c4768 4450static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4451{
408c4768
PE		 4452 __addrconf_sysctl_unregister(&idev->cnf);
4453 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4454}
4455
4456
4457#endif
4458
2c8c1e72 4459static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4460{
4461 int err;
4462 struct ipv6_devconf *all, *dflt;
4463
4464 err = -ENOMEM;
4465 all = &ipv6_devconf;
4466 dflt = &ipv6_devconf_dflt;
4467
09ad9bc7 4468 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4469 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4470 if (all == NULL)
4471 goto err_alloc_all;
4472
4473 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4474 if (dflt == NULL)
4475 goto err_alloc_dflt;
56d417b1
BH		 4476 } else {
4477 /* these will be inherited by all namespaces */
4478 dflt->autoconf = ipv6_defaults.autoconf;
4479 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4480 }
4481
4482 net->ipv6.devconf_all = all;
4483 net->ipv6.devconf_dflt = dflt;
4484
4485#ifdef CONFIG_SYSCTL
f8572d8f 4486 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4487 if (err < 0)
4488 goto err_reg_all;
4489
f8572d8f 4490 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4491 if (err < 0)
4492 goto err_reg_dflt;
4493#endif
4494 return 0;
4495
4496#ifdef CONFIG_SYSCTL
4497err_reg_dflt:
4498 __addrconf_sysctl_unregister(all);
4499err_reg_all:
4500 kfree(dflt);
4501#endif
4502err_alloc_dflt:
4503 kfree(all);
4504err_alloc_all:
4505 return err;
4506}
4507
2c8c1e72 4508static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4509{
4510#ifdef CONFIG_SYSCTL
4511 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4512 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4513#endif
09ad9bc7 4514 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4515 kfree(net->ipv6.devconf_dflt);
4516 kfree(net->ipv6.devconf_all);
4517 }
4518}
4519
4520static struct pernet_operations addrconf_ops = {
4521 .init = addrconf_init_net,
4522 .exit = addrconf_exit_net,
4523};
4524
1da177e4
LT		 4525/*
4526 * Device notifier
4527 */
4528
4529int register_inet6addr_notifier(struct notifier_block *nb)
4530{
1ab1457c 4531 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4532}
4533
7159039a
YH		 4534EXPORT_SYMBOL(register_inet6addr_notifier);
4535
1da177e4
LT		 4536int unregister_inet6addr_notifier(struct notifier_block *nb)
4537{
1ab1457c 4538 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4539}
4540
7159039a
YH		 4541EXPORT_SYMBOL(unregister_inet6addr_notifier);
4542
1da177e4
LT		 4543/*
4544 * Init / cleanup code
4545 */
4546
4547int __init addrconf_init(void)
4548{
2a8cc6c8
YH		 4549 int err;
4550
4551 if ((err = ipv6_addr_label_init()) < 0) {
4552 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4553 err);
4554 return err;
4555 }
1da177e4 4556
e0da5a48
PE		 4557 register_pernet_subsys(&addrconf_ops);
4558
1da177e4
LT		 4559 /* The addrconf netdev notifier requires that loopback_dev
4560 * has it's ipv6 private information allocated and setup
4561 * before it can bring up and give link-local addresses
4562 * to other devices which are up.
4563 *
4564 * Unfortunately, loopback_dev is not necessarily the first
4565 * entry in the global dev_base list of net devices. In fact,
4566 * it is likely to be the very last entry on that list.
4567 * So this causes the notifier registry below to try and
4568 * give link-local addresses to all devices besides loopback_dev
4569 * first, then loopback_dev, which cases all the non-loopback_dev
4570 * devices to fail to get a link-local address.
4571 *
4572 * So, as a temporary fix, allocate the ipv6 structure for
4573 * loopback_dev first by hand.
4574 * Longer term, all of the dependencies ipv6 has upon the loopback
4575 * device and it being up should be removed.
4576 */
4577 rtnl_lock();
2774c7ab 4578 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4579 err = -ENOMEM;
4580 rtnl_unlock();
4581 if (err)
e0da5a48 4582 goto errlo;
1da177e4
LT		 4583
4584 register_netdevice_notifier(&ipv6_dev_notf);
4585
1da177e4 4586 addrconf_verify(0);
c127ea2c
TG		 4587
4588 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4589 if (err < 0)
4590 goto errout;
4591
4592 /* Only the first call to __rtnl_register can fail */
4593 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4594 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4595 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4596 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4597 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4598
2a8cc6c8
YH		 4599 ipv6_addr_label_rtnl_register();
4600
1da177e4 4601 return 0;
c127ea2c
TG		 4602errout:
4603 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4604errlo:
4605 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4606
4607 return err;
1da177e4
LT		 4608}
4609
09f7709f 4610void addrconf_cleanup(void)
1da177e4 4611{
1ab1457c 4612 struct inet6_ifaddr *ifa;
176c39af 4613 struct net_device *dev;
1da177e4
LT		 4614 int i;
4615
4616 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4617 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4618
4619 rtnl_lock();
4620
176c39af
DL		 4621 /* clean dev list */
4622 for_each_netdev(&init_net, dev) {
4623 if (__in6_dev_get(dev) == NULL)
4624 continue;
4625 addrconf_ifdown(dev, 1);
4626 }
4627 addrconf_ifdown(init_net.loopback_dev, 2);
4628
1da177e4
LT		 4629 /*
4630 * Check hash table.
4631 */
1da177e4
LT		 4632 write_lock_bh(&addrconf_hash_lock);
4633 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4634 for (ifa=inet6_addr_lst[i]; ifa; ) {
4635 struct inet6_ifaddr *bifa;
4636
4637 bifa = ifa;
4638 ifa = ifa->lst_next;
4639 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4640 /* Do not free it; something is wrong.
4641 Now we can investigate it with debugger.
4642 */
4643 }
4644 }
4645 write_unlock_bh(&addrconf_hash_lock);
4646
4647 del_timer(&addr_chk_timer);
1da177e4 4648 rtnl_unlock();
1da177e4 4649}
Clone of davem's net-next-2.6 tree