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[IPV6]: Define constants for link-local multicast addresses.
[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 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
ab32ea5d 157struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 188};
189
ab32ea5d 190static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201#ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207#endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 209 .accept_ra_defrtr = 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216#endif
930d6ff2 217#endif
fbea49e1 218 .proxy_ndp = 0,
0bcbc926 219 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 220};
221
222/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 223const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 225const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
226const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 227
f24e3d65
MC		 228/* Check if a valid qdisc is available */
229static inline int addrconf_qdisc_ok(struct net_device *dev)
230{
231 return (dev->qdisc != &noop_qdisc);
232}
233
1da177e4
LT		 234static void addrconf_del_timer(struct inet6_ifaddr *ifp)
235{
236 if (del_timer(&ifp->timer))
237 __in6_ifa_put(ifp);
238}
239
240enum addrconf_timer_t
241{
242 AC_NONE,
243 AC_DAD,
244 AC_RS,
245};
246
247static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
248 enum addrconf_timer_t what,
249 unsigned long when)
250{
251 if (!del_timer(&ifp->timer))
252 in6_ifa_hold(ifp);
253
254 switch (what) {
255 case AC_DAD:
256 ifp->timer.function = addrconf_dad_timer;
257 break;
258 case AC_RS:
259 ifp->timer.function = addrconf_rs_timer;
260 break;
261 default:;
262 }
263 ifp->timer.expires = jiffies + when;
264 add_timer(&ifp->timer);
265}
266
7f7d9a6b
HX		 267static int snmp6_alloc_dev(struct inet6_dev *idev)
268{
7f7d9a6b 269 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 270 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 271 goto err_ip;
272 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 273 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 274 goto err_icmp;
14878f75 275 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 276 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 277 goto err_icmpmsg;
7f7d9a6b
HX		 278
279 return 0;
280
14878f75
DS		 281err_icmpmsg:
282 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 283err_icmp:
284 snmp_mib_free((void **)idev->stats.ipv6);
285err_ip:
aaf70ec7 286 return -ENOMEM;
7f7d9a6b
HX		 287}
288
16910b98 289static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 290{
14878f75 291 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 292 snmp_mib_free((void **)idev->stats.icmpv6);
293 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 294}
295
1da177e4
LT		 296/* Nobody refers to this device, we may destroy it. */
297
8814c4b5
YH		 298static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
299{
300 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
301 kfree(idev);
302}
303
1da177e4
LT		 304void in6_dev_finish_destroy(struct inet6_dev *idev)
305{
306 struct net_device *dev = idev->dev;
307 BUG_TRAP(idev->addr_list==NULL);
308 BUG_TRAP(idev->mc_list==NULL);
309#ifdef NET_REFCNT_DEBUG
310 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
311#endif
312 dev_put(dev);
313 if (!idev->dead) {
314 printk("Freeing alive inet6 device %p\n", idev);
315 return;
316 }
317 snmp6_free_dev(idev);
8814c4b5 318 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 319}
320
7159039a
YH		 321EXPORT_SYMBOL(in6_dev_finish_destroy);
322
1da177e4
LT		 323static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
324{
325 struct inet6_dev *ndev;
326
327 ASSERT_RTNL();
328
329 if (dev->mtu < IPV6_MIN_MTU)
330 return NULL;
331
1ab1457c 332 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 333
1ab1457c
YH		 334 if (ndev == NULL)
335 return NULL;
322f74a4
IO		 336
337 rwlock_init(&ndev->lock);
338 ndev->dev = dev;
c346dca1 339 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 340 ndev->cnf.mtu6 = dev->mtu;
341 ndev->cnf.sysctl = NULL;
342 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
343 if (ndev->nd_parms == NULL) {
344 kfree(ndev);
345 return NULL;
346 }
347 /* We refer to the device */
348 dev_hold(dev);
1da177e4 349
322f74a4
IO		 350 if (snmp6_alloc_dev(ndev) < 0) {
351 ADBG((KERN_WARNING
352 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 353 __func__, dev->name));
322f74a4
IO		 354 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 ndev->dead = 1;
356 in6_dev_finish_destroy(ndev);
357 return NULL;
358 }
1da177e4 359
322f74a4
IO		 360 if (snmp6_register_dev(ndev) < 0) {
361 ADBG((KERN_WARNING
362 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 363 __func__, dev->name));
322f74a4
IO		 364 neigh_parms_release(&nd_tbl, ndev->nd_parms);
365 ndev->dead = 1;
366 in6_dev_finish_destroy(ndev);
367 return NULL;
368 }
369
370 /* One reference from device. We must do this before
371 * we invoke __ipv6_regen_rndid().
372 */
373 in6_dev_hold(ndev);
1da177e4
LT		 374
375#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 379#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
380 dev->type == ARPHRD_SIT ||
381#endif
382 dev->type == ARPHRD_NONE) {
322f74a4
IO		 383 printk(KERN_INFO
384 "%s: Disabled Privacy Extensions\n",
385 dev->name);
386 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 387
388 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
389 printk(KERN_INFO
390 "%s: Disabled Multicast RS\n",
391 dev->name);
392 ndev->cnf.rtr_solicits = 0;
393 }
322f74a4
IO		 394 } else {
395 in6_dev_hold(ndev);
396 ipv6_regen_rndid((unsigned long) ndev);
397 }
1da177e4
LT		 398#endif
399
f24e3d65 400 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 401 ndev->if_flags |= IF_READY;
402
322f74a4
IO		 403 ipv6_mc_init_dev(ndev);
404 ndev->tstamp = jiffies;
f52295a9 405 addrconf_sysctl_register(ndev);
30c4cf57
DS		 406 /* protected by rtnl_lock */
407 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 408
409 /* Join all-node multicast group */
f3ee4010 410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 411
1da177e4
LT		 412 return ndev;
413}
414
7bc570c8 415struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
1da177e4
LT		 436
437 if (!idev)
438 return;
439 dev = idev->dev;
440 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 441 if (idev->cnf.forwarding)
f3ee4010 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 443 else
f3ee4010 444 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 445 }
446 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 447 if (ifa->flags&IFA_F_TENTATIVE)
448 continue;
1da177e4
LT		 449 if (idev->cnf.forwarding)
450 addrconf_join_anycast(ifa);
451 else
452 addrconf_leave_anycast(ifa);
453 }
454}
455
456
e186932b 457static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 458{
459 struct net_device *dev;
460 struct inet6_dev *idev;
461
462 read_lock(&dev_base_lock);
bff16c2f 463 for_each_netdev(net, dev) {
8814c4b5 464 rcu_read_lock();
1da177e4
LT		 465 idev = __in6_dev_get(dev);
466 if (idev) {
e186932b
PE		 467 int changed = (!idev->cnf.forwarding) ^ (!newf);
468 idev->cnf.forwarding = newf;
1da177e4
LT		 469 if (changed)
470 dev_forward_change(idev);
471 }
8814c4b5 472 rcu_read_unlock();
1da177e4
LT		 473 }
474 read_unlock(&dev_base_lock);
475}
c8fecf22
PE		 476
477static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
478{
bff16c2f
PE		 479 struct net *net;
480
481 net = (struct net *)table->extra2;
441fc2a2 482 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 483 return;
484
e186932b
PE		 485 if (p == &net->ipv6.devconf_all->forwarding) {
486 __s32 newf = net->ipv6.devconf_all->forwarding;
487 net->ipv6.devconf_dflt->forwarding = newf;
488 addrconf_forward_change(net, newf);
c8fecf22
PE		 489 } else if ((!*p) ^ (!old))
490 dev_forward_change((struct inet6_dev *)table->extra1);
491
492 if (*p)
7b4da532 493 rt6_purge_dflt_routers(net);
c8fecf22 494}
1da177e4
LT		 495#endif
496
497/* Nobody refers to this ifaddr, destroy it */
498
499void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
500{
501 BUG_TRAP(ifp->if_next==NULL);
502 BUG_TRAP(ifp->lst_next==NULL);
503#ifdef NET_REFCNT_DEBUG
504 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
505#endif
506
507 in6_dev_put(ifp->idev);
508
509 if (del_timer(&ifp->timer))
510 printk("Timer is still running, when freeing ifa=%p\n", ifp);
511
512 if (!ifp->dead) {
513 printk("Freeing alive inet6 address %p\n", ifp);
514 return;
515 }
516 dst_release(&ifp->rt->u.dst);
517
518 kfree(ifp);
519}
520
e55ffac6
BH		 521static void
522ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
523{
524 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 525 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 526
527 /*
528 * Each device address list is sorted in order of scope -
529 * global before linklocal.
530 */
531 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
532 ifap = &ifa->if_next) {
8a6ce0c0 533 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 534 break;
535 }
536
537 ifp->if_next = *ifap;
538 *ifap = ifp;
539}
540
3eb84f49
YH		 541/*
542 * Hash function taken from net_alias.c
543 */
544static u8 ipv6_addr_hash(const struct in6_addr *addr)
545{
546 __u32 word;
547
548 /*
549 * We perform the hash function over the last 64 bits of the address
550 * This will include the IEEE address token on links that support it.
551 */
552
553 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
554 word ^= (word >> 16);
555 word ^= (word >> 8);
556
557 return ((word ^ (word >> 4)) & 0x0f);
558}
559
1da177e4
LT		 560/* On success it returns ifp with increased reference count */
561
562static struct inet6_ifaddr *
563ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 564 int scope, u32 flags)
1da177e4
LT		 565{
566 struct inet6_ifaddr *ifa = NULL;
567 struct rt6_info *rt;
568 int hash;
569 int err = 0;
570
8814c4b5 571 rcu_read_lock_bh();
1da177e4
LT		 572 if (idev->dead) {
573 err = -ENODEV; /*XXX*/
574 goto out2;
575 }
576
577 write_lock(&addrconf_hash_lock);
578
579 /* Ignore adding duplicate addresses on an interface */
c346dca1 580 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 581 ADBG(("ipv6_add_addr: already assigned\n"));
582 err = -EEXIST;
583 goto out;
584 }
585
322f74a4 586 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 587
588 if (ifa == NULL) {
589 ADBG(("ipv6_add_addr: malloc failed\n"));
590 err = -ENOBUFS;
591 goto out;
592 }
593
594 rt = addrconf_dst_alloc(idev, addr, 0);
595 if (IS_ERR(rt)) {
596 err = PTR_ERR(rt);
597 goto out;
598 }
599
1da177e4
LT		 600 ipv6_addr_copy(&ifa->addr, addr);
601
602 spin_lock_init(&ifa->lock);
603 init_timer(&ifa->timer);
604 ifa->timer.data = (unsigned long) ifa;
605 ifa->scope = scope;
606 ifa->prefix_len = pfxlen;
607 ifa->flags = flags | IFA_F_TENTATIVE;
608 ifa->cstamp = ifa->tstamp = jiffies;
609
57f5f544
KF		 610 ifa->rt = rt;
611
95c385b4
NH		 612 /*
613 * part one of RFC 4429, section 3.3
614 * We should not configure an address as
615 * optimistic if we do not yet know the link
616 * layer address of our nexhop router
617 */
618
619 if (rt->rt6i_nexthop == NULL)
620 ifa->flags &= ~IFA_F_OPTIMISTIC;
621
1da177e4
LT		 622 ifa->idev = idev;
623 in6_dev_hold(idev);
624 /* For caller */
625 in6_ifa_hold(ifa);
626
627 /* Add to big hash table */
628 hash = ipv6_addr_hash(addr);
629
630 ifa->lst_next = inet6_addr_lst[hash];
631 inet6_addr_lst[hash] = ifa;
632 in6_ifa_hold(ifa);
633 write_unlock(&addrconf_hash_lock);
634
635 write_lock(&idev->lock);
636 /* Add to inet6_dev unicast addr list. */
e55ffac6 637 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 638
639#ifdef CONFIG_IPV6_PRIVACY
640 if (ifa->flags&IFA_F_TEMPORARY) {
641 ifa->tmp_next = idev->tempaddr_list;
642 idev->tempaddr_list = ifa;
643 in6_ifa_hold(ifa);
644 }
645#endif
646
1da177e4
LT		 647 in6_ifa_hold(ifa);
648 write_unlock(&idev->lock);
649out2:
8814c4b5 650 rcu_read_unlock_bh();
1da177e4 651
fd92833a 652 if (likely(err == 0))
e041c683 653 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 654 else {
655 kfree(ifa);
656 ifa = ERR_PTR(err);
657 }
658
659 return ifa;
660out:
661 write_unlock(&addrconf_hash_lock);
662 goto out2;
663}
664
665/* This function wants to get referenced ifp and releases it before return */
666
667static void ipv6_del_addr(struct inet6_ifaddr *ifp)
668{
669 struct inet6_ifaddr *ifa, **ifap;
670 struct inet6_dev *idev = ifp->idev;
671 int hash;
672 int deleted = 0, onlink = 0;
673 unsigned long expires = jiffies;
674
675 hash = ipv6_addr_hash(&ifp->addr);
676
677 ifp->dead = 1;
678
679 write_lock_bh(&addrconf_hash_lock);
680 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
681 ifap = &ifa->lst_next) {
682 if (ifa == ifp) {
683 *ifap = ifa->lst_next;
684 __in6_ifa_put(ifp);
685 ifa->lst_next = NULL;
686 break;
687 }
688 }
689 write_unlock_bh(&addrconf_hash_lock);
690
691 write_lock_bh(&idev->lock);
692#ifdef CONFIG_IPV6_PRIVACY
693 if (ifp->flags&IFA_F_TEMPORARY) {
694 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
695 ifap = &ifa->tmp_next) {
696 if (ifa == ifp) {
697 *ifap = ifa->tmp_next;
698 if (ifp->ifpub) {
699 in6_ifa_put(ifp->ifpub);
700 ifp->ifpub = NULL;
701 }
702 __in6_ifa_put(ifp);
703 ifa->tmp_next = NULL;
704 break;
705 }
706 }
707 }
708#endif
709
1d142804 710 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 711 if (ifa == ifp) {
712 *ifap = ifa->if_next;
713 __in6_ifa_put(ifp);
714 ifa->if_next = NULL;
715 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
716 break;
717 deleted = 1;
1d142804 718 continue;
1da177e4
LT		 719 } else if (ifp->flags & IFA_F_PERMANENT) {
720 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
721 ifp->prefix_len)) {
722 if (ifa->flags & IFA_F_PERMANENT) {
723 onlink = 1;
724 if (deleted)
725 break;
726 } else {
727 unsigned long lifetime;
728
729 if (!onlink)
730 onlink = -1;
731
732 spin_lock(&ifa->lock);
733 lifetime = min_t(unsigned long,
734 ifa->valid_lft, 0x7fffffffUL/HZ);
735 if (time_before(expires,
736 ifa->tstamp + lifetime * HZ))
737 expires = ifa->tstamp + lifetime * HZ;
738 spin_unlock(&ifa->lock);
739 }
740 }
741 }
1d142804 742 ifap = &ifa->if_next;
1da177e4
LT		 743 }
744 write_unlock_bh(&idev->lock);
745
746 ipv6_ifa_notify(RTM_DELADDR, ifp);
747
e041c683 748 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 749
750 addrconf_del_timer(ifp);
751
752 /*
753 * Purge or update corresponding prefix
754 *
755 * 1) we don't purge prefix here if address was not permanent.
756 * prefix is managed by its own lifetime.
757 * 2) if there're no addresses, delete prefix.
758 * 3) if there're still other permanent address(es),
759 * corresponding prefix is still permanent.
760 * 4) otherwise, update prefix lifetime to the
761 * longest valid lifetime among the corresponding
762 * addresses on the device.
763 * Note: subsequent RA will update lifetime.
764 *
765 * --yoshfuji
766 */
767 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
768 struct in6_addr prefix;
769 struct rt6_info *rt;
c346dca1 770 struct net *net = dev_net(ifp->idev->dev);
1da177e4 771 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 772 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4
LT		 773
774 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
775 if (onlink == 0) {
e0a1ad73 776 ip6_del_rt(rt);
1da177e4
LT		 777 rt = NULL;
778 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
779 rt->rt6i_expires = expires;
780 rt->rt6i_flags |= RTF_EXPIRES;
781 }
782 }
783 dst_release(&rt->u.dst);
784 }
785
786 in6_ifa_put(ifp);
787}
788
789#ifdef CONFIG_IPV6_PRIVACY
790static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
791{
792 struct inet6_dev *idev = ifp->idev;
793 struct in6_addr addr, *tmpaddr;
794 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 795 unsigned long regen_advance;
1da177e4
LT		 796 int tmp_plen;
797 int ret = 0;
798 int max_addresses;
95c385b4 799 u32 addr_flags;
1da177e4
LT		 800
801 write_lock(&idev->lock);
802 if (ift) {
803 spin_lock_bh(&ift->lock);
804 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
805 spin_unlock_bh(&ift->lock);
806 tmpaddr = &addr;
807 } else {
808 tmpaddr = NULL;
809 }
810retry:
811 in6_dev_hold(idev);
812 if (idev->cnf.use_tempaddr <= 0) {
813 write_unlock(&idev->lock);
814 printk(KERN_INFO
815 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
816 in6_dev_put(idev);
817 ret = -1;
818 goto out;
819 }
820 spin_lock_bh(&ifp->lock);
821 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
822 idev->cnf.use_tempaddr = -1; /*XXX*/
823 spin_unlock_bh(&ifp->lock);
824 write_unlock(&idev->lock);
825 printk(KERN_WARNING
826 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
827 in6_dev_put(idev);
828 ret = -1;
829 goto out;
830 }
831 in6_ifa_hold(ifp);
832 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
833 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
834 spin_unlock_bh(&ifp->lock);
835 write_unlock(&idev->lock);
836 printk(KERN_WARNING
837 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
838 in6_ifa_put(ifp);
839 in6_dev_put(idev);
840 ret = -1;
841 goto out;
842 }
843 memcpy(&addr.s6_addr[8], idev->rndid, 8);
844 tmp_valid_lft = min_t(__u32,
845 ifp->valid_lft,
846 idev->cnf.temp_valid_lft);
1ab1457c
YH		 847 tmp_prefered_lft = min_t(__u32,
848 ifp->prefered_lft,
1da177e4
LT		 849 idev->cnf.temp_prefered_lft - desync_factor / HZ);
850 tmp_plen = ifp->prefix_len;
851 max_addresses = idev->cnf.max_addresses;
852 tmp_cstamp = ifp->cstamp;
853 tmp_tstamp = ifp->tstamp;
854 spin_unlock_bh(&ifp->lock);
855
eac55bf9
BB		 856 regen_advance = idev->cnf.regen_max_retry *
857 idev->cnf.dad_transmits *
858 idev->nd_parms->retrans_time / HZ;
1da177e4 859 write_unlock(&idev->lock);
95c385b4 860
eac55bf9
BB		 861 /* A temporary address is created only if this calculated Preferred
862 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
863 * an implementation must not create a temporary address with a zero
864 * Preferred Lifetime.
865 */
866 if (tmp_prefered_lft <= regen_advance) {
867 in6_ifa_put(ifp);
868 in6_dev_put(idev);
869 ret = -1;
870 goto out;
871 }
872
95c385b4
NH		 873 addr_flags = IFA_F_TEMPORARY;
874 /* set in addrconf_prefix_rcv() */
875 if (ifp->flags & IFA_F_OPTIMISTIC)
876 addr_flags |= IFA_F_OPTIMISTIC;
877
1da177e4 878 ift = !max_addresses ||
1ab1457c 879 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 880 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 881 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
882 addr_flags) : NULL;
1da177e4
LT		 883 if (!ift || IS_ERR(ift)) {
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 printk(KERN_INFO
887 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
888 tmpaddr = &addr;
889 write_lock(&idev->lock);
890 goto retry;
891 }
892
893 spin_lock_bh(&ift->lock);
894 ift->ifpub = ifp;
895 ift->valid_lft = tmp_valid_lft;
896 ift->prefered_lft = tmp_prefered_lft;
897 ift->cstamp = tmp_cstamp;
898 ift->tstamp = tmp_tstamp;
899 spin_unlock_bh(&ift->lock);
900
901 addrconf_dad_start(ift, 0);
902 in6_ifa_put(ift);
903 in6_dev_put(idev);
904out:
905 return ret;
906}
907#endif
908
909/*
072047e4 910 * Choose an appropriate source address (RFC3484)
1da177e4 911 */
a9b05723
YH		 912enum {
913 IPV6_SADDR_RULE_INIT = 0,
914 IPV6_SADDR_RULE_LOCAL,
915 IPV6_SADDR_RULE_SCOPE,
916 IPV6_SADDR_RULE_PREFERRED,
917#ifdef CONFIG_IPV6_MIP6
918 IPV6_SADDR_RULE_HOA,
919#endif
920 IPV6_SADDR_RULE_OIF,
921 IPV6_SADDR_RULE_LABEL,
922#ifdef CONFIG_IPV6_PRIVACY
923 IPV6_SADDR_RULE_PRIVACY,
924#endif
925 IPV6_SADDR_RULE_ORCHID,
926 IPV6_SADDR_RULE_PREFIX,
927 IPV6_SADDR_RULE_MAX
928};
929
072047e4 930struct ipv6_saddr_score {
a9b05723
YH		 931 int rule;
932 int addr_type;
933 struct inet6_ifaddr *ifa;
934 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
935 int scopedist;
936 int matchlen;
072047e4
YH		 937};
938
a9b05723 939struct ipv6_saddr_dst {
9acd9f3a 940 const struct in6_addr *addr;
a9b05723
YH		 941 int ifindex;
942 int scope;
943 int label;
7cbca67c 944 unsigned int prefs;
a9b05723 945};
072047e4 946
b6f99a21 947static inline int ipv6_saddr_preferred(int type)
1da177e4 948{
072047e4
YH		 949 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
950 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
951 return 1;
952 return 0;
1da177e4
LT		 953}
954
a9b05723
YH		 955static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
956 struct ipv6_saddr_dst *dst,
957 int i)
958{
959 int ret;
960
961 if (i <= score->rule) {
962 switch (i) {
963 case IPV6_SADDR_RULE_SCOPE:
964 ret = score->scopedist;
965 break;
966 case IPV6_SADDR_RULE_PREFIX:
967 ret = score->matchlen;
968 break;
969 default:
970 ret = !!test_bit(i, score->scorebits);
971 }
972 goto out;
973 }
974
975 switch (i) {
976 case IPV6_SADDR_RULE_INIT:
977 /* Rule 0: remember if hiscore is not ready yet */
978 ret = !!score->ifa;
979 break;
980 case IPV6_SADDR_RULE_LOCAL:
981 /* Rule 1: Prefer same address */
982 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
983 break;
984 case IPV6_SADDR_RULE_SCOPE:
985 /* Rule 2: Prefer appropriate scope
986 *
987 * ret
988 * ^
989 * -1 | d 15
990 * ---+--+-+---> scope
991 * |
992 * | d is scope of the destination.
993 * B-d | \
994 * | \ <- smaller scope is better if
995 * B-15 | \ if scope is enough for destinaion.
996 * | ret = B - scope (-1 <= scope >= d <= 15).
997 * d-C-1 | /
998 * |/ <- greater is better
999 * -C / if scope is not enough for destination.
1000 * /| ret = scope - C (-1 <= d < scope <= 15).
1001 *
1002 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1003 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1004 * Assume B = 0 and we get C > 29.
1005 */
1006 ret = __ipv6_addr_src_scope(score->addr_type);
1007 if (ret >= dst->scope)
1008 ret = -ret;
1009 else
1010 ret -= 128; /* 30 is enough */
1011 score->scopedist = ret;
1012 break;
1013 case IPV6_SADDR_RULE_PREFERRED:
1014 /* Rule 3: Avoid deprecated and optimistic addresses */
1015 ret = ipv6_saddr_preferred(score->addr_type) ||
1016 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1017 break;
1018#ifdef CONFIG_IPV6_MIP6
1019 case IPV6_SADDR_RULE_HOA:
7cbca67c 1020 {
a9b05723 1021 /* Rule 4: Prefer home address */
7cbca67c
YH		 1022 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1023 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1024 break;
7cbca67c 1025 }
a9b05723
YH		 1026#endif
1027 case IPV6_SADDR_RULE_OIF:
1028 /* Rule 5: Prefer outgoing interface */
1029 ret = (!dst->ifindex ||
1030 dst->ifindex == score->ifa->idev->dev->ifindex);
1031 break;
1032 case IPV6_SADDR_RULE_LABEL:
1033 /* Rule 6: Prefer matching label */
1034 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1035 score->ifa->idev->dev->ifindex) == dst->label;
1036 break;
1037#ifdef CONFIG_IPV6_PRIVACY
1038 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1039 {
a9b05723
YH		 1040 /* Rule 7: Prefer public address
1041 * Note: prefer temprary address if use_tempaddr >= 2
1042 */
7cbca67c
YH		 1043 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1044 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1045 score->ifa->idev->cnf.use_tempaddr >= 2;
1046 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1047 break;
7cbca67c 1048 }
a9b05723
YH		 1049#endif
1050 case IPV6_SADDR_RULE_ORCHID:
1051 /* Rule 8-: Prefer ORCHID vs ORCHID or
1052 * non-ORCHID vs non-ORCHID
1053 */
1054 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1055 ipv6_addr_orchid(dst->addr));
1056 break;
1057 case IPV6_SADDR_RULE_PREFIX:
1058 /* Rule 8: Use longest matching prefix */
1059 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1060 dst->addr);
1061 break;
1062 default:
1063 ret = 0;
1064 }
1065
1066 if (ret)
1067 __set_bit(i, score->scorebits);
1068 score->rule = i;
1069out:
1070 return ret;
1071}
1072
1073int ipv6_dev_get_saddr(struct net_device *dst_dev,
9acd9f3a 1074 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1075 struct in6_addr *saddr)
1da177e4 1076{
a9b05723
YH		 1077 struct ipv6_saddr_score scores[2],
1078 *score = &scores[0], *hiscore = &scores[1];
c346dca1 1079 struct net *net = dev_net(dst_dev);
a9b05723 1080 struct ipv6_saddr_dst dst;
072047e4 1081 struct net_device *dev;
a9b05723 1082 int dst_type;
1da177e4 1083
a9b05723
YH		 1084 dst_type = __ipv6_addr_type(daddr);
1085 dst.addr = daddr;
1086 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1087 dst.scope = __ipv6_addr_src_scope(dst_type);
1088 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
7cbca67c 1089 dst.prefs = prefs;
a9b05723
YH		 1090
1091 hiscore->rule = -1;
1092 hiscore->ifa = NULL;
1da177e4 1093
072047e4 1094 read_lock(&dev_base_lock);
8814c4b5 1095 rcu_read_lock();
1da177e4 1096
6fda7350 1097 for_each_netdev(net, dev) {
072047e4 1098 struct inet6_dev *idev;
072047e4 1099
a9b05723 1100 /* Candidate Source Address (section 4)
072047e4
YH		 1101 * - multicast and link-local destination address,
1102 * the set of candidate source address MUST only
1103 * include addresses assigned to interfaces
1104 * belonging to the same link as the outgoing
1105 * interface.
1106 * (- For site-local destination addresses, the
1107 * set of candidate source addresses MUST only
1108 * include addresses assigned to interfaces
1109 * belonging to the same site as the outgoing
1110 * interface.)
1111 */
a9b05723
YH		 1112 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1113 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1114 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1115 continue;
1da177e4 1116
1da177e4 1117 idev = __in6_dev_get(dev);
072047e4
YH		 1118 if (!idev)
1119 continue;
1120
1121 read_lock_bh(&idev->lock);
a9b05723
YH		 1122 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1123 int i;
072047e4 1124
a9b05723 1125 /*
6b3ae80a
YH		 1126 * - Tentative Address (RFC2462 section 5.4)
1127 * - A tentative address is not considered
1128 * "assigned to an interface" in the traditional
95c385b4 1129 * sense, unless it is also flagged as optimistic.
6b3ae80a 1130 * - Candidate Source Address (section 4)
072047e4
YH		 1131 * - In any case, anycast addresses, multicast
1132 * addresses, and the unspecified address MUST
1133 * NOT be included in a candidate set.
1134 */
a9b05723
YH		 1135 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1136 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1137 continue;
a9b05723
YH		 1138
1139 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1140
1141 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1142 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1143 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1144 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1145 "assigned as unicast address on %s",
1146 dev->name);
1147 continue;
1148 }
1149
a9b05723
YH		 1150 score->rule = -1;
1151 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1152
1153 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1154 int minihiscore, miniscore;
1155
1156 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1157 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1158
1159 if (minihiscore > miniscore) {
1160 if (i == IPV6_SADDR_RULE_SCOPE &&
1161 score->scopedist > 0) {
1162 /*
1163 * special case:
1164 * each remaining entry
1165 * has too small (not enough)
1166 * scope, because ifa entries
1167 * are sorted by their scope
1168 * values.
1169 */
1170 goto try_nextdev;
1171 }
1172 break;
1173 } else if (minihiscore < miniscore) {
1174 struct ipv6_saddr_score *tmp;
1175
1176 if (hiscore->ifa)
1177 in6_ifa_put(hiscore->ifa);
1178
1179 in6_ifa_hold(score->ifa);
1180
1181 tmp = hiscore;
1182 hiscore = score;
1183 score = tmp;
1184
1185 /* restore our iterator */
1186 score->ifa = hiscore->ifa;
1187
1188 break;
1da177e4 1189 }
072047e4 1190 }
1da177e4 1191 }
a9b05723 1192try_nextdev:
072047e4 1193 read_unlock_bh(&idev->lock);
1da177e4 1194 }
8814c4b5 1195 rcu_read_unlock();
1da177e4
LT		 1196 read_unlock(&dev_base_lock);
1197
a9b05723 1198 if (!hiscore->ifa)
072047e4 1199 return -EADDRNOTAVAIL;
1ab1457c 1200
a9b05723
YH		 1201 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1202 in6_ifa_put(hiscore->ifa);
072047e4 1203 return 0;
1da177e4
LT		 1204}
1205
5e5f3f0f 1206EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1207
95c385b4
NH		 1208int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1209 unsigned char banned_flags)
1da177e4
LT		 1210{
1211 struct inet6_dev *idev;
1212 int err = -EADDRNOTAVAIL;
1213
8814c4b5 1214 rcu_read_lock();
1da177e4
LT		 1215 if ((idev = __in6_dev_get(dev)) != NULL) {
1216 struct inet6_ifaddr *ifp;
1217
1218 read_lock_bh(&idev->lock);
1219 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1220 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1221 ipv6_addr_copy(addr, &ifp->addr);
1222 err = 0;
1223 break;
1224 }
1225 }
1226 read_unlock_bh(&idev->lock);
1227 }
8814c4b5 1228 rcu_read_unlock();
1da177e4
LT		 1229 return err;
1230}
1231
1232static int ipv6_count_addresses(struct inet6_dev *idev)
1233{
1234 int cnt = 0;
1235 struct inet6_ifaddr *ifp;
1236
1237 read_lock_bh(&idev->lock);
1238 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1239 cnt++;
1240 read_unlock_bh(&idev->lock);
1241 return cnt;
1242}
1243
bfeade08
DL		 1244int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1245 struct net_device *dev, int strict)
1da177e4
LT		 1246{
1247 struct inet6_ifaddr * ifp;
1248 u8 hash = ipv6_addr_hash(addr);
1249
1250 read_lock_bh(&addrconf_hash_lock);
1251 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1252 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1253 continue;
1da177e4
LT		 1254 if (ipv6_addr_equal(&ifp->addr, addr) &&
1255 !(ifp->flags&IFA_F_TENTATIVE)) {
1256 if (dev == NULL || ifp->idev->dev == dev ||
1257 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1258 break;
1259 }
1260 }
1261 read_unlock_bh(&addrconf_hash_lock);
1262 return ifp != NULL;
1263}
7159039a
YH		 1264EXPORT_SYMBOL(ipv6_chk_addr);
1265
1da177e4 1266static
06bfe655
DL		 1267int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1268 struct net_device *dev)
1da177e4
LT		 1269{
1270 struct inet6_ifaddr * ifp;
1271 u8 hash = ipv6_addr_hash(addr);
1272
1273 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1274 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1275 continue;
1da177e4
LT		 1276 if (ipv6_addr_equal(&ifp->addr, addr)) {
1277 if (dev == NULL || ifp->idev->dev == dev)
1278 break;
1279 }
1280 }
1281 return ifp != NULL;
1282}
1283
52eeeb84
YH		 1284int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1285{
1286 struct inet6_dev *idev;
1287 struct inet6_ifaddr *ifa;
1288 int onlink;
1289
1290 onlink = 0;
1291 rcu_read_lock();
1292 idev = __in6_dev_get(dev);
1293 if (idev) {
1294 read_lock_bh(&idev->lock);
1295 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1296 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1297 ifa->prefix_len);
1298 if (onlink)
1299 break;
1300 }
1301 read_unlock_bh(&idev->lock);
1302 }
1303 rcu_read_unlock();
1304 return onlink;
1305}
1306
1307EXPORT_SYMBOL(ipv6_chk_prefix);
1308
9acd9f3a 1309struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1310 struct net_device *dev, int strict)
1da177e4
LT		 1311{
1312 struct inet6_ifaddr * ifp;
1313 u8 hash = ipv6_addr_hash(addr);
1314
1315 read_lock_bh(&addrconf_hash_lock);
1316 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1317 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1318 continue;
1da177e4
LT		 1319 if (ipv6_addr_equal(&ifp->addr, addr)) {
1320 if (dev == NULL || ifp->idev->dev == dev ||
1321 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1322 in6_ifa_hold(ifp);
1323 break;
1324 }
1325 }
1326 }
1327 read_unlock_bh(&addrconf_hash_lock);
1328
1329 return ifp;
1330}
1331
1332int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1333{
1334 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1335 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1336 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1337 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1338 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1339 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1340 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1341 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1342
1343 if (!sk2_rcv_saddr && !sk_ipv6only)
1344 return 1;
1345
1346 if (addr_type2 == IPV6_ADDR_ANY &&
1347 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1348 return 1;
1349
1350 if (addr_type == IPV6_ADDR_ANY &&
1351 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1352 return 1;
1353
1354 if (sk2_rcv_saddr6 &&
1355 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1356 return 1;
1357
1358 if (addr_type == IPV6_ADDR_MAPPED &&
1359 !sk2_ipv6only &&
1360 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1361 return 1;
1362
1363 return 0;
1364}
1365
1366/* Gets referenced address, destroys ifaddr */
1367
9f5336e2 1368static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1369{
1da177e4
LT		 1370 if (ifp->flags&IFA_F_PERMANENT) {
1371 spin_lock_bh(&ifp->lock);
1372 addrconf_del_timer(ifp);
1373 ifp->flags |= IFA_F_TENTATIVE;
1374 spin_unlock_bh(&ifp->lock);
1375 in6_ifa_put(ifp);
1376#ifdef CONFIG_IPV6_PRIVACY
1377 } else if (ifp->flags&IFA_F_TEMPORARY) {
1378 struct inet6_ifaddr *ifpub;
1379 spin_lock_bh(&ifp->lock);
1380 ifpub = ifp->ifpub;
1381 if (ifpub) {
1382 in6_ifa_hold(ifpub);
1383 spin_unlock_bh(&ifp->lock);
1384 ipv6_create_tempaddr(ifpub, ifp);
1385 in6_ifa_put(ifpub);
1386 } else {
1387 spin_unlock_bh(&ifp->lock);
1388 }
1389 ipv6_del_addr(ifp);
1390#endif
1391 } else
1392 ipv6_del_addr(ifp);
1393}
1394
3c21edbd
YH		 1395void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1396{
1397 if (net_ratelimit())
1398 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1399 addrconf_dad_stop(ifp);
1400}
1da177e4
LT		 1401
1402/* Join to solicited addr multicast group. */
1403
1404void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1405{
1406 struct in6_addr maddr;
1407
1408 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1409 return;
1410
1411 addrconf_addr_solict_mult(addr, &maddr);
1412 ipv6_dev_mc_inc(dev, &maddr);
1413}
1414
1415void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1416{
1417 struct in6_addr maddr;
1418
1419 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1420 return;
1421
1422 addrconf_addr_solict_mult(addr, &maddr);
1423 __ipv6_dev_mc_dec(idev, &maddr);
1424}
1425
20380731 1426static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1427{
1428 struct in6_addr addr;
1429 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1430 if (ipv6_addr_any(&addr))
1431 return;
1432 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1433}
1434
20380731 1435static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1436{
1437 struct in6_addr addr;
1438 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1439 if (ipv6_addr_any(&addr))
1440 return;
1441 __ipv6_dev_ac_dec(ifp->idev, &addr);
1442}
1443
073a8e0e
YH		 1444static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1445{
1446 if (dev->addr_len != ETH_ALEN)
1447 return -1;
1448 memcpy(eui, dev->dev_addr, 3);
1449 memcpy(eui + 5, dev->dev_addr + 3, 3);
1450
1451 /*
1452 * The zSeries OSA network cards can be shared among various
1453 * OS instances, but the OSA cards have only one MAC address.
1454 * This leads to duplicate address conflicts in conjunction
1455 * with IPv6 if more than one instance uses the same card.
1456 *
1457 * The driver for these cards can deliver a unique 16-bit
1458 * identifier for each instance sharing the same card. It is
1459 * placed instead of 0xFFFE in the interface identifier. The
1460 * "u" bit of the interface identifier is not inverted in this
1461 * case. Hence the resulting interface identifier has local
1462 * scope according to RFC2373.
1463 */
1464 if (dev->dev_id) {
1465 eui[3] = (dev->dev_id >> 8) & 0xFF;
1466 eui[4] = dev->dev_id & 0xFF;
1467 } else {
1468 eui[3] = 0xFF;
1469 eui[4] = 0xFE;
1470 eui[0] ^= 2;
1471 }
1472 return 0;
1473}
1474
1475static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1476{
1477 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1478 if (dev->addr_len != ARCNET_ALEN)
1479 return -1;
1480 memset(eui, 0, 7);
1481 eui[7] = *(u8*)dev->dev_addr;
1482 return 0;
1483}
1484
1485static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1486{
1487 if (dev->addr_len != INFINIBAND_ALEN)
1488 return -1;
1489 memcpy(eui, dev->dev_addr + 12, 8);
1490 eui[0] |= 2;
1491 return 0;
1492}
1493
dfd982ba
YH		 1494int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1495{
1496 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1497 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1498 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1499 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1500 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1501 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1502 eui[1] = 0;
1503 eui[2] = 0x5E;
1504 eui[3] = 0xFE;
1505 memcpy(eui + 4, &addr, 4);
1506 return 0;
1507}
1508EXPORT_SYMBOL(__ipv6_isatap_ifid);
1509
1510static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1511{
1512 if (dev->priv_flags & IFF_ISATAP)
1513 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1514 return -1;
1515}
1516
1da177e4
LT		 1517static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1518{
1519 switch (dev->type) {
1520 case ARPHRD_ETHER:
1521 case ARPHRD_FDDI:
1522 case ARPHRD_IEEE802_TR:
073a8e0e 1523 return addrconf_ifid_eui48(eui, dev);
1da177e4 1524 case ARPHRD_ARCNET:
073a8e0e 1525 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1526 case ARPHRD_INFINIBAND:
073a8e0e 1527 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1528 case ARPHRD_SIT:
dfd982ba 1529 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1530 }
1531 return -1;
1532}
1533
1534static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1535{
1536 int err = -1;
1537 struct inet6_ifaddr *ifp;
1538
1539 read_lock_bh(&idev->lock);
1540 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1541 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1542 memcpy(eui, ifp->addr.s6_addr+8, 8);
1543 err = 0;
1544 break;
1545 }
1546 }
1547 read_unlock_bh(&idev->lock);
1548 return err;
1549}
1550
1551#ifdef CONFIG_IPV6_PRIVACY
1552/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1553static int __ipv6_regen_rndid(struct inet6_dev *idev)
1554{
1da177e4 1555regen:
955189ef 1556 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1557 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1558
1559 /*
1560 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1561 * check if generated address is not inappropriate
1562 *
1563 * - Reserved subnet anycast (RFC 2526)
1564 * 11111101 11....11 1xxxxxxx
c7dc89c0 1565 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1566 * 00-00-5E-FE-xx-xx-xx-xx
1567 * - value 0
1568 * - XXX: already assigned to an address on the device
1569 */
1ab1457c 1570 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1571 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1572 (idev->rndid[7]&0x80))
1573 goto regen;
1574 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1575 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1576 goto regen;
1577 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1578 goto regen;
1579 }
1580
1581 return 0;
1582}
1583
1584static void ipv6_regen_rndid(unsigned long data)
1585{
1586 struct inet6_dev *idev = (struct inet6_dev *) data;
1587 unsigned long expires;
1588
8814c4b5 1589 rcu_read_lock_bh();
1da177e4
LT		 1590 write_lock_bh(&idev->lock);
1591
1592 if (idev->dead)
1593 goto out;
1594
1595 if (__ipv6_regen_rndid(idev) < 0)
1596 goto out;
1ab1457c 1597
1da177e4 1598 expires = jiffies +
1ab1457c 1599 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1600 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1601 if (time_before(expires, jiffies)) {
1602 printk(KERN_WARNING
1603 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1604 idev->dev->name);
1605 goto out;
1606 }
1607
1608 if (!mod_timer(&idev->regen_timer, expires))
1609 in6_dev_hold(idev);
1610
1611out:
1612 write_unlock_bh(&idev->lock);
8814c4b5 1613 rcu_read_unlock_bh();
1da177e4
LT		 1614 in6_dev_put(idev);
1615}
1616
1617static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1618 int ret = 0;
1619
1620 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1621 ret = __ipv6_regen_rndid(idev);
1622 return ret;
1623}
1624#endif
1625
1626/*
1627 * Add prefix route.
1628 */
1629
1630static void
1631addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1632 unsigned long expires, u32 flags)
1da177e4 1633{
86872cb5
TG		 1634 struct fib6_config cfg = {
1635 .fc_table = RT6_TABLE_PREFIX,
1636 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1637 .fc_ifindex = dev->ifindex,
1638 .fc_expires = expires,
1639 .fc_dst_len = plen,
1640 .fc_flags = RTF_UP | flags,
c346dca1 1641 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1642 };
1da177e4 1643
86872cb5 1644 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1645
1646 /* Prevent useless cloning on PtP SIT.
1647 This thing is done here expecting that the whole
1648 class of non-broadcast devices need not cloning.
1649 */
0be669bb 1650#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1651 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1652 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1653#endif
1da177e4 1654
86872cb5 1655 ip6_route_add(&cfg);
1da177e4
LT		 1656}
1657
1658/* Create "default" multicast route to the interface */
1659
1660static void addrconf_add_mroute(struct net_device *dev)
1661{
86872cb5
TG		 1662 struct fib6_config cfg = {
1663 .fc_table = RT6_TABLE_LOCAL,
1664 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1665 .fc_ifindex = dev->ifindex,
1666 .fc_dst_len = 8,
1667 .fc_flags = RTF_UP,
c346dca1 1668 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1669 };
1670
1671 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1672
1673 ip6_route_add(&cfg);
1da177e4
LT		 1674}
1675
0be669bb 1676#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1677static void sit_route_add(struct net_device *dev)
1678{
86872cb5
TG		 1679 struct fib6_config cfg = {
1680 .fc_table = RT6_TABLE_MAIN,
1681 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1682 .fc_ifindex = dev->ifindex,
1683 .fc_dst_len = 96,
1684 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1685 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1686 };
1da177e4
LT		 1687
1688 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1689 ip6_route_add(&cfg);
1da177e4 1690}
0be669bb 1691#endif
1da177e4
LT		 1692
1693static void addrconf_add_lroute(struct net_device *dev)
1694{
1695 struct in6_addr addr;
1696
1697 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1698 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1699}
1700
1701static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1702{
1703 struct inet6_dev *idev;
1704
1705 ASSERT_RTNL();
1706
1707 if ((idev = ipv6_find_idev(dev)) == NULL)
1708 return NULL;
1709
1710 /* Add default multicast route */
1711 addrconf_add_mroute(dev);
1712
1713 /* Add link local route */
1714 addrconf_add_lroute(dev);
1715 return idev;
1716}
1717
1718void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1719{
1720 struct prefix_info *pinfo;
1721 __u32 valid_lft;
1722 __u32 prefered_lft;
1723 int addr_type;
1724 unsigned long rt_expires;
1725 struct inet6_dev *in6_dev;
1726
1727 pinfo = (struct prefix_info *) opt;
1ab1457c 1728
1da177e4
LT		 1729 if (len < sizeof(struct prefix_info)) {
1730 ADBG(("addrconf: prefix option too short\n"));
1731 return;
1732 }
1ab1457c 1733
1da177e4
LT		 1734 /*
1735 * Validation checks ([ADDRCONF], page 19)
1736 */
1737
1738 addr_type = ipv6_addr_type(&pinfo->prefix);
1739
1740 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1741 return;
1742
1743 valid_lft = ntohl(pinfo->valid);
1744 prefered_lft = ntohl(pinfo->prefered);
1745
1746 if (prefered_lft > valid_lft) {
1747 if (net_ratelimit())
1748 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1749 return;
1750 }
1751
1752 in6_dev = in6_dev_get(dev);
1753
1754 if (in6_dev == NULL) {
1755 if (net_ratelimit())
1756 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1757 return;
1758 }
1759
1760 /*
1761 * Two things going on here:
1762 * 1) Add routes for on-link prefixes
1763 * 2) Configure prefixes with the auto flag set
1764 */
1765
1766 /* Avoid arithmetic overflow. Really, we could
1767 save rt_expires in seconds, likely valid_lft,
1768 but it would require division in fib gc, that it
1769 not good.
1770 */
1771 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1772 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1773 else
3dd4bc68
YH		 1774 rt_expires = valid_lft * HZ;
1775
1776 /*
1777 * We convert this (in jiffies) to clock_t later.
1778 * Avoid arithmetic overflow there as well.
1779 * Overflow can happen only if HZ < USER_HZ.
1780 */
1781 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1782 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1783
1784 if (pinfo->onlink) {
1785 struct rt6_info *rt;
c346dca1 1786 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1787 dev->ifindex, 1);
1da177e4
LT		 1788
1789 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1790 if (rt->rt6i_flags&RTF_EXPIRES) {
1791 if (valid_lft == 0) {
e0a1ad73 1792 ip6_del_rt(rt);
1da177e4
LT		 1793 rt = NULL;
1794 } else {
3dd4bc68 1795 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1796 }
1797 }
1798 } else if (valid_lft) {
1799 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1800 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1801 }
1802 if (rt)
1803 dst_release(&rt->u.dst);
1804 }
1805
1806 /* Try to figure out our local address for this prefix */
1807
1808 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1809 struct inet6_ifaddr * ifp;
1810 struct in6_addr addr;
1811 int create = 0, update_lft = 0;
1812
1813 if (pinfo->prefix_len == 64) {
1814 memcpy(&addr, &pinfo->prefix, 8);
1815 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1816 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1817 in6_dev_put(in6_dev);
1818 return;
1819 }
1820 goto ok;
1821 }
1822 if (net_ratelimit())
1823 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1824 pinfo->prefix_len);
1825 in6_dev_put(in6_dev);
1826 return;
1827
1828ok:
1829
c346dca1 1830 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1da177e4
LT		 1831
1832 if (ifp == NULL && valid_lft) {
1833 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1834 u32 addr_flags = 0;
1835
1836#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1837 if (in6_dev->cnf.optimistic_dad &&
1838 !ipv6_devconf.forwarding)
1839 addr_flags = IFA_F_OPTIMISTIC;
1840#endif
1da177e4
LT		 1841
1842 /* Do not allow to create too much of autoconfigured
1843 * addresses; this would be too easy way to crash kernel.
1844 */
1845 if (!max_addresses ||
1846 ipv6_count_addresses(in6_dev) < max_addresses)
1847 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1848 addr_type&IPV6_ADDR_SCOPE_MASK,
1849 addr_flags);
1da177e4
LT		 1850
1851 if (!ifp || IS_ERR(ifp)) {
1852 in6_dev_put(in6_dev);
1853 return;
1854 }
1855
1856 update_lft = create = 1;
1857 ifp->cstamp = jiffies;
1858 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1859 }
1860
1861 if (ifp) {
1862 int flags;
1863 unsigned long now;
1864#ifdef CONFIG_IPV6_PRIVACY
1865 struct inet6_ifaddr *ift;
1866#endif
1867 u32 stored_lft;
1868
1869 /* update lifetime (RFC2462 5.5.3 e) */
1870 spin_lock(&ifp->lock);
1871 now = jiffies;
1872 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1873 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1874 else
1875 stored_lft = 0;
1876 if (!update_lft && stored_lft) {
1877 if (valid_lft > MIN_VALID_LIFETIME ||
1878 valid_lft > stored_lft)
1879 update_lft = 1;
1880 else if (stored_lft <= MIN_VALID_LIFETIME) {
1881 /* valid_lft <= stored_lft is always true */
1882 /* XXX: IPsec */
1883 update_lft = 0;
1884 } else {
1885 valid_lft = MIN_VALID_LIFETIME;
1886 if (valid_lft < prefered_lft)
1887 prefered_lft = valid_lft;
1888 update_lft = 1;
1889 }
1890 }
1891
1892 if (update_lft) {
1893 ifp->valid_lft = valid_lft;
1894 ifp->prefered_lft = prefered_lft;
1895 ifp->tstamp = now;
1896 flags = ifp->flags;
1897 ifp->flags &= ~IFA_F_DEPRECATED;
1898 spin_unlock(&ifp->lock);
1899
1900 if (!(flags&IFA_F_TENTATIVE))
1901 ipv6_ifa_notify(0, ifp);
1902 } else
1903 spin_unlock(&ifp->lock);
1904
1905#ifdef CONFIG_IPV6_PRIVACY
1906 read_lock_bh(&in6_dev->lock);
1907 /* update all temporary addresses in the list */
1908 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1909 /*
1910 * When adjusting the lifetimes of an existing
1911 * temporary address, only lower the lifetimes.
1912 * Implementations must not increase the
1913 * lifetimes of an existing temporary address
1914 * when processing a Prefix Information Option.
1915 */
c6fbfac2
BB		 1916 if (ifp != ift->ifpub)
1917 continue;
1918
1da177e4
LT		 1919 spin_lock(&ift->lock);
1920 flags = ift->flags;
1921 if (ift->valid_lft > valid_lft &&
1922 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1923 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1924 if (ift->prefered_lft > prefered_lft &&
1925 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1926 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1927 spin_unlock(&ift->lock);
1928 if (!(flags&IFA_F_TENTATIVE))
1929 ipv6_ifa_notify(0, ift);
1930 }
1931
1932 if (create && in6_dev->cnf.use_tempaddr > 0) {
1933 /*
1934 * When a new public address is created as described in [ADDRCONF],
1935 * also create a new temporary address.
1936 */
1ab1457c 1937 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1938 ipv6_create_tempaddr(ifp, NULL);
1939 } else {
1940 read_unlock_bh(&in6_dev->lock);
1941 }
1942#endif
1943 in6_ifa_put(ifp);
1944 addrconf_verify(0);
1945 }
1946 }
1947 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1948 in6_dev_put(in6_dev);
1949}
1950
1951/*
1952 * Set destination address.
1953 * Special case for SIT interfaces where we create a new "virtual"
1954 * device.
1955 */
af284937 1956int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 1957{
1958 struct in6_ifreq ireq;
1959 struct net_device *dev;
1960 int err = -EINVAL;
1961
1962 rtnl_lock();
1963
1964 err = -EFAULT;
1965 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1966 goto err_exit;
1967
af284937 1968 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 1969
1970 err = -ENODEV;
1971 if (dev == NULL)
1972 goto err_exit;
1973
0be669bb 1974#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1975 if (dev->type == ARPHRD_SIT) {
1976 struct ifreq ifr;
1977 mm_segment_t oldfs;
1978 struct ip_tunnel_parm p;
1979
1980 err = -EADDRNOTAVAIL;
1981 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1982 goto err_exit;
1983
1984 memset(&p, 0, sizeof(p));
1985 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1986 p.iph.saddr = 0;
1987 p.iph.version = 4;
1988 p.iph.ihl = 5;
1989 p.iph.protocol = IPPROTO_IPV6;
1990 p.iph.ttl = 64;
d20b3109 1991 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1992
1993 oldfs = get_fs(); set_fs(KERNEL_DS);
1994 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1995 set_fs(oldfs);
1996
1997 if (err == 0) {
1998 err = -ENOBUFS;
af284937
DL		 1999 dev = __dev_get_by_name(net, p.name);
2000 if (!dev)
1da177e4
LT		 2001 goto err_exit;
2002 err = dev_open(dev);
2003 }
2004 }
0be669bb 2005#endif
1da177e4
LT		 2006
2007err_exit:
2008 rtnl_unlock();
2009 return err;
2010}
2011
2012/*
2013 * Manual configuration of address on an interface
2014 */
af284937
DL		 2015static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2016 int plen, __u8 ifa_flags, __u32 prefered_lft,
2017 __u32 valid_lft)
1da177e4
LT		 2018{
2019 struct inet6_ifaddr *ifp;
2020 struct inet6_dev *idev;
2021 struct net_device *dev;
2022 int scope;
46d48046 2023 u32 flags = RTF_EXPIRES;
1da177e4
LT		 2024
2025 ASSERT_RTNL();
1ab1457c 2026
0778769d
NT		 2027 /* check the lifetime */
2028 if (!valid_lft || prefered_lft > valid_lft)
2029 return -EINVAL;
2030
af284937
DL		 2031 dev = __dev_get_by_index(net, ifindex);
2032 if (!dev)
1da177e4 2033 return -ENODEV;
1ab1457c 2034
1da177e4
LT		 2035 if ((idev = addrconf_add_dev(dev)) == NULL)
2036 return -ENOBUFS;
2037
2038 scope = ipv6_addr_scope(pfx);
2039
46d48046 2040 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 2041 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 2042 flags = 0;
2043 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 2044 valid_lft = 0x7FFFFFFF/HZ;
2045
2046 if (prefered_lft == 0)
2047 ifa_flags |= IFA_F_DEPRECATED;
2048 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2049 (prefered_lft != INFINITY_LIFE_TIME))
2050 prefered_lft = 0x7FFFFFFF/HZ;
2051
2052 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2053
1da177e4 2054 if (!IS_ERR(ifp)) {
06aebfb7 2055 spin_lock_bh(&ifp->lock);
0778769d
NT		 2056 ifp->valid_lft = valid_lft;
2057 ifp->prefered_lft = prefered_lft;
2058 ifp->tstamp = jiffies;
06aebfb7 2059 spin_unlock_bh(&ifp->lock);
0778769d 2060
46d48046
YH		 2061 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2062 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 2063 /*
2064 * Note that section 3.1 of RFC 4429 indicates
2065 * that the Optimistic flag should not be set for
2066 * manually configured addresses
2067 */
1da177e4
LT		 2068 addrconf_dad_start(ifp, 0);
2069 in6_ifa_put(ifp);
0778769d 2070 addrconf_verify(0);
1da177e4
LT		 2071 return 0;
2072 }
2073
2074 return PTR_ERR(ifp);
2075}
2076
af284937
DL		 2077static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2078 int plen)
1da177e4
LT		 2079{
2080 struct inet6_ifaddr *ifp;
2081 struct inet6_dev *idev;
2082 struct net_device *dev;
1ab1457c 2083
af284937
DL		 2084 dev = __dev_get_by_index(net, ifindex);
2085 if (!dev)
1da177e4
LT		 2086 return -ENODEV;
2087
2088 if ((idev = __in6_dev_get(dev)) == NULL)
2089 return -ENXIO;
2090
2091 read_lock_bh(&idev->lock);
2092 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2093 if (ifp->prefix_len == plen &&
2094 ipv6_addr_equal(pfx, &ifp->addr)) {
2095 in6_ifa_hold(ifp);
2096 read_unlock_bh(&idev->lock);
1ab1457c 2097
1da177e4
LT		 2098 ipv6_del_addr(ifp);
2099
2100 /* If the last address is deleted administratively,
2101 disable IPv6 on this interface.
2102 */
2103 if (idev->addr_list == NULL)
2104 addrconf_ifdown(idev->dev, 1);
2105 return 0;
2106 }
2107 }
2108 read_unlock_bh(&idev->lock);
2109 return -EADDRNOTAVAIL;
2110}
2111
2112
af284937 2113int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2114{
2115 struct in6_ifreq ireq;
2116 int err;
1ab1457c 2117
1da177e4
LT		 2118 if (!capable(CAP_NET_ADMIN))
2119 return -EPERM;
1ab1457c 2120
1da177e4
LT		 2121 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2122 return -EFAULT;
2123
2124 rtnl_lock();
af284937
DL		 2125 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2126 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2127 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2128 rtnl_unlock();
2129 return err;
2130}
2131
af284937 2132int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2133{
2134 struct in6_ifreq ireq;
2135 int err;
1ab1457c 2136
1da177e4
LT		 2137 if (!capable(CAP_NET_ADMIN))
2138 return -EPERM;
2139
2140 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2141 return -EFAULT;
2142
2143 rtnl_lock();
af284937
DL		 2144 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2145 ireq.ifr6_prefixlen);
1da177e4
LT		 2146 rtnl_unlock();
2147 return err;
2148}
2149
0be669bb 2150#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2151static void sit_add_v4_addrs(struct inet6_dev *idev)
2152{
2153 struct inet6_ifaddr * ifp;
2154 struct in6_addr addr;
2155 struct net_device *dev;
c346dca1 2156 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2157 int scope;
2158
2159 ASSERT_RTNL();
2160
2161 memset(&addr, 0, sizeof(struct in6_addr));
2162 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2163
2164 if (idev->dev->flags&IFF_POINTOPOINT) {
2165 addr.s6_addr32[0] = htonl(0xfe800000);
2166 scope = IFA_LINK;
2167 } else {
2168 scope = IPV6_ADDR_COMPATv4;
2169 }
2170
2171 if (addr.s6_addr32[3]) {
2172 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2173 if (!IS_ERR(ifp)) {
2174 spin_lock_bh(&ifp->lock);
2175 ifp->flags &= ~IFA_F_TENTATIVE;
2176 spin_unlock_bh(&ifp->lock);
2177 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2178 in6_ifa_put(ifp);
2179 }
2180 return;
2181 }
2182
6fda7350 2183 for_each_netdev(net, dev) {
e5ed6399 2184 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2185 if (in_dev && (dev->flags & IFF_UP)) {
2186 struct in_ifaddr * ifa;
2187
2188 int flag = scope;
2189
2190 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2191 int plen;
2192
2193 addr.s6_addr32[3] = ifa->ifa_local;
2194
2195 if (ifa->ifa_scope == RT_SCOPE_LINK)
2196 continue;
2197 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2198 if (idev->dev->flags&IFF_POINTOPOINT)
2199 continue;
2200 flag |= IFA_HOST;
2201 }
2202 if (idev->dev->flags&IFF_POINTOPOINT)
2203 plen = 64;
2204 else
2205 plen = 96;
2206
2207 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2208 IFA_F_PERMANENT);
2209 if (!IS_ERR(ifp)) {
2210 spin_lock_bh(&ifp->lock);
2211 ifp->flags &= ~IFA_F_TENTATIVE;
2212 spin_unlock_bh(&ifp->lock);
2213 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2214 in6_ifa_put(ifp);
2215 }
2216 }
2217 }
1ab1457c 2218 }
1da177e4 2219}
0be669bb 2220#endif
1da177e4
LT		 2221
2222static void init_loopback(struct net_device *dev)
2223{
2224 struct inet6_dev *idev;
2225 struct inet6_ifaddr * ifp;
2226
2227 /* ::1 */
2228
2229 ASSERT_RTNL();
2230
2231 if ((idev = ipv6_find_idev(dev)) == NULL) {
2232 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2233 return;
2234 }
2235
2236 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2237 if (!IS_ERR(ifp)) {
2238 spin_lock_bh(&ifp->lock);
2239 ifp->flags &= ~IFA_F_TENTATIVE;
2240 spin_unlock_bh(&ifp->lock);
2241 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2242 in6_ifa_put(ifp);
2243 }
2244}
2245
2246static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2247{
2248 struct inet6_ifaddr * ifp;
95c385b4
NH		 2249 u32 addr_flags = IFA_F_PERMANENT;
2250
2251#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2252 if (idev->cnf.optimistic_dad &&
2253 !ipv6_devconf.forwarding)
2254 addr_flags |= IFA_F_OPTIMISTIC;
2255#endif
1da177e4 2256
95c385b4
NH		 2257
2258 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2259 if (!IS_ERR(ifp)) {
46d48046 2260 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2261 addrconf_dad_start(ifp, 0);
2262 in6_ifa_put(ifp);
2263 }
2264}
2265
2266static void addrconf_dev_config(struct net_device *dev)
2267{
2268 struct in6_addr addr;
2269 struct inet6_dev * idev;
2270
2271 ASSERT_RTNL();
2272
74235a25
HX		 2273 if ((dev->type != ARPHRD_ETHER) &&
2274 (dev->type != ARPHRD_FDDI) &&
2275 (dev->type != ARPHRD_IEEE802_TR) &&
2276 (dev->type != ARPHRD_ARCNET) &&
2277 (dev->type != ARPHRD_INFINIBAND)) {
2278 /* Alas, we support only Ethernet autoconfiguration. */
2279 return;
2280 }
2281
1da177e4
LT		 2282 idev = addrconf_add_dev(dev);
2283 if (idev == NULL)
2284 return;
2285
2286 memset(&addr, 0, sizeof(struct in6_addr));
2287 addr.s6_addr32[0] = htonl(0xFE800000);
2288
2289 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2290 addrconf_add_linklocal(idev, &addr);
2291}
2292
0be669bb 2293#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2294static void addrconf_sit_config(struct net_device *dev)
2295{
2296 struct inet6_dev *idev;
2297
2298 ASSERT_RTNL();
2299
1ab1457c
YH		 2300 /*
2301 * Configure the tunnel with one of our IPv4
2302 * addresses... we should configure all of
1da177e4
LT		 2303 * our v4 addrs in the tunnel
2304 */
2305
2306 if ((idev = ipv6_find_idev(dev)) == NULL) {
2307 printk(KERN_DEBUG "init sit: add_dev failed\n");
2308 return;
2309 }
2310
c7dc89c0
FT		 2311 if (dev->priv_flags & IFF_ISATAP) {
2312 struct in6_addr addr;
2313
2314 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2315 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2316 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2317 addrconf_add_linklocal(idev, &addr);
2318 return;
2319 }
2320
1da177e4
LT		 2321 sit_add_v4_addrs(idev);
2322
2323 if (dev->flags&IFF_POINTOPOINT) {
2324 addrconf_add_mroute(dev);
2325 addrconf_add_lroute(dev);
2326 } else
2327 sit_route_add(dev);
2328}
0be669bb 2329#endif
1da177e4
LT		 2330
2331static inline int
2332ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2333{
2334 struct in6_addr lladdr;
2335
95c385b4 2336 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2337 addrconf_add_linklocal(idev, &lladdr);
2338 return 0;
2339 }
2340 return -1;
2341}
2342
2343static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2344{
2345 struct net_device *link_dev;
c346dca1 2346 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2347
2348 /* first try to inherit the link-local address from the link device */
2349 if (idev->dev->iflink &&
6fda7350 2350 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2351 if (!ipv6_inherit_linklocal(idev, link_dev))
2352 return;
2353 }
2354 /* then try to inherit it from any device */
6fda7350 2355 for_each_netdev(net, link_dev) {
1da177e4
LT		 2356 if (!ipv6_inherit_linklocal(idev, link_dev))
2357 return;
2358 }
2359 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2360}
2361
2362/*
2363 * Autoconfigure tunnel with a link-local address so routing protocols,
2364 * DHCPv6, MLD etc. can be run over the virtual link
2365 */
2366
2367static void addrconf_ip6_tnl_config(struct net_device *dev)
2368{
2369 struct inet6_dev *idev;
2370
2371 ASSERT_RTNL();
2372
2373 if ((idev = addrconf_add_dev(dev)) == NULL) {
2374 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2375 return;
2376 }
2377 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2378}
2379
1ab1457c 2380static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2381 void * data)
2382{
2383 struct net_device *dev = (struct net_device *) data;
74235a25 2384 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2385 int run_pending = 0;
b217d616 2386 int err;
1da177e4
LT		 2387
2388 switch(event) {
45ba9dd2 2389 case NETDEV_REGISTER:
74235a25 2390 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2391 idev = ipv6_add_dev(dev);
2392 if (!idev)
b217d616 2393 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2394 }
2395 break;
1da177e4 2396 case NETDEV_UP:
3c21edbd 2397 case NETDEV_CHANGE:
c2edacf8
JV		 2398 if (dev->flags & IFF_SLAVE)
2399 break;
2400
3c21edbd 2401 if (event == NETDEV_UP) {
f24e3d65 2402 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2403 /* device is not ready yet. */
2404 printk(KERN_INFO
2405 "ADDRCONF(NETDEV_UP): %s: "
2406 "link is not ready\n",
2407 dev->name);
2408 break;
2409 }
99081049 2410
d31c7b8f
EP		 2411 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2412 idev = ipv6_add_dev(dev);
2413
99081049
KS		 2414 if (idev)
2415 idev->if_flags |= IF_READY;
3c21edbd 2416 } else {
f24e3d65 2417 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2418 /* device is still not ready. */
2419 break;
2420 }
2421
2422 if (idev) {
2423 if (idev->if_flags & IF_READY) {
2424 /* device is already configured. */
2425 break;
2426 }
2427 idev->if_flags |= IF_READY;
2428 }
2429
2430 printk(KERN_INFO
2431 "ADDRCONF(NETDEV_CHANGE): %s: "
2432 "link becomes ready\n",
2433 dev->name);
2434
c5e33bdd 2435 run_pending = 1;
3c21edbd
YH		 2436 }
2437
1da177e4 2438 switch(dev->type) {
0be669bb 2439#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2440 case ARPHRD_SIT:
2441 addrconf_sit_config(dev);
2442 break;
0be669bb 2443#endif
1da177e4
LT		 2444 case ARPHRD_TUNNEL6:
2445 addrconf_ip6_tnl_config(dev);
2446 break;
2447 case ARPHRD_LOOPBACK:
2448 init_loopback(dev);
2449 break;
2450
2451 default:
2452 addrconf_dev_config(dev);
2453 break;
3ff50b79 2454 }
1da177e4 2455 if (idev) {
c5e33bdd
YH		 2456 if (run_pending)
2457 addrconf_dad_run(idev);
2458
1da177e4
LT		 2459 /* If the MTU changed during the interface down, when the
2460 interface up, the changed MTU must be reflected in the
2461 idev as well as routers.
2462 */
2463 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2464 rt6_mtu_change(dev, dev->mtu);
2465 idev->cnf.mtu6 = dev->mtu;
2466 }
2467 idev->tstamp = jiffies;
2468 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2469 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2470 stop IPv6 on this interface.
2471 */
2472 if (dev->mtu < IPV6_MIN_MTU)
2473 addrconf_ifdown(dev, event != NETDEV_DOWN);
2474 }
2475 break;
2476
2477 case NETDEV_CHANGEMTU:
d31c7b8f 2478 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2479 rt6_mtu_change(dev, dev->mtu);
2480 idev->cnf.mtu6 = dev->mtu;
2481 break;
2482 }
2483
d31c7b8f
EP		 2484 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2485 idev = ipv6_add_dev(dev);
2486 if (idev)
2487 break;
2488 }
2489
1da177e4
LT		 2490 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2491
2492 case NETDEV_DOWN:
2493 case NETDEV_UNREGISTER:
2494 /*
2495 * Remove all addresses from this interface.
2496 */
2497 addrconf_ifdown(dev, event != NETDEV_DOWN);
2498 break;
3c21edbd 2499
1da177e4 2500 case NETDEV_CHANGENAME:
1da177e4 2501 if (idev) {
5632c515 2502 snmp6_unregister_dev(idev);
408c4768 2503 addrconf_sysctl_unregister(idev);
f52295a9 2504 addrconf_sysctl_register(idev);
b217d616
HX		 2505 err = snmp6_register_dev(idev);
2506 if (err)
2507 return notifier_from_errno(err);
5632c515 2508 }
1da177e4 2509 break;
3ff50b79 2510 }
1da177e4
LT		 2511
2512 return NOTIFY_OK;
2513}
2514
2515/*
2516 * addrconf module should be notified of a device going up
2517 */
2518static struct notifier_block ipv6_dev_notf = {
2519 .notifier_call = addrconf_notify,
2520 .priority = 0
2521};
2522
2523static int addrconf_ifdown(struct net_device *dev, int how)
2524{
2525 struct inet6_dev *idev;
2526 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2527 struct net *net = dev_net(dev);
1da177e4
LT		 2528 int i;
2529
2530 ASSERT_RTNL();
2531
2774c7ab 2532 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2533 how = 0;
2534
f3db4851 2535 rt6_ifdown(net, dev);
1da177e4
LT		 2536 neigh_ifdown(&nd_tbl, dev);
2537
2538 idev = __in6_dev_get(dev);
2539 if (idev == NULL)
2540 return -ENODEV;
2541
2542 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2543 Do not dev_put!
1da177e4
LT		 2544 */
2545 if (how == 1) {
1da177e4 2546 idev->dead = 1;
8814c4b5
YH		 2547
2548 /* protected by rtnl_lock */
2549 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2550
2551 /* Step 1.5: remove snmp6 entry */
2552 snmp6_unregister_dev(idev);
2553
2554 }
2555
2556 /* Step 2: clear hash table */
2557 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2558 bifa = &inet6_addr_lst[i];
2559
2560 write_lock_bh(&addrconf_hash_lock);
2561 while ((ifa = *bifa) != NULL) {
2562 if (ifa->idev == idev) {
2563 *bifa = ifa->lst_next;
2564 ifa->lst_next = NULL;
2565 addrconf_del_timer(ifa);
2566 in6_ifa_put(ifa);
2567 continue;
2568 }
2569 bifa = &ifa->lst_next;
2570 }
2571 write_unlock_bh(&addrconf_hash_lock);
2572 }
2573
2574 write_lock_bh(&idev->lock);
2575
2576 /* Step 3: clear flags for stateless addrconf */
2577 if (how != 1)
3c21edbd 2578 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2579
2580 /* Step 4: clear address list */
2581#ifdef CONFIG_IPV6_PRIVACY
2582 if (how == 1 && del_timer(&idev->regen_timer))
2583 in6_dev_put(idev);
2584
2585 /* clear tempaddr list */
2586 while ((ifa = idev->tempaddr_list) != NULL) {
2587 idev->tempaddr_list = ifa->tmp_next;
2588 ifa->tmp_next = NULL;
2589 ifa->dead = 1;
2590 write_unlock_bh(&idev->lock);
2591 spin_lock_bh(&ifa->lock);
2592
2593 if (ifa->ifpub) {
2594 in6_ifa_put(ifa->ifpub);
2595 ifa->ifpub = NULL;
2596 }
2597 spin_unlock_bh(&ifa->lock);
2598 in6_ifa_put(ifa);
2599 write_lock_bh(&idev->lock);
2600 }
2601#endif
2602 while ((ifa = idev->addr_list) != NULL) {
2603 idev->addr_list = ifa->if_next;
2604 ifa->if_next = NULL;
2605 ifa->dead = 1;
2606 addrconf_del_timer(ifa);
2607 write_unlock_bh(&idev->lock);
2608
2609 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2610 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2611 in6_ifa_put(ifa);
2612
2613 write_lock_bh(&idev->lock);
2614 }
2615 write_unlock_bh(&idev->lock);
2616
2617 /* Step 5: Discard multicast list */
2618
2619 if (how == 1)
2620 ipv6_mc_destroy_dev(idev);
2621 else
2622 ipv6_mc_down(idev);
2623
1da177e4 2624 idev->tstamp = jiffies;
1ab1457c 2625
1da177e4
LT		 2626 /* Shot the device (if unregistered) */
2627
2628 if (how == 1) {
408c4768 2629 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2630 neigh_parms_release(&nd_tbl, idev->nd_parms);
2631 neigh_ifdown(&nd_tbl, dev);
2632 in6_dev_put(idev);
2633 }
2634 return 0;
2635}
2636
2637static void addrconf_rs_timer(unsigned long data)
2638{
2639 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2640
2641 if (ifp->idev->cnf.forwarding)
2642 goto out;
2643
2644 if (ifp->idev->if_flags & IF_RA_RCVD) {
2645 /*
2646 * Announcement received after solicitation
2647 * was sent
2648 */
2649 goto out;
2650 }
2651
2652 spin_lock(&ifp->lock);
2653 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
1da177e4
LT		 2654 /* The wait after the last probe can be shorter */
2655 addrconf_mod_timer(ifp, AC_RS,
2656 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2657 ifp->idev->cnf.rtr_solicit_delay :
2658 ifp->idev->cnf.rtr_solicit_interval);
2659 spin_unlock(&ifp->lock);
2660
f3ee4010 2661 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2662 } else {
2663 spin_unlock(&ifp->lock);
2664 /*
2665 * Note: we do not support deprecated "all on-link"
2666 * assumption any longer.
2667 */
2668 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2669 ifp->idev->dev->name);
2670 }
2671
2672out:
2673 in6_ifa_put(ifp);
2674}
2675
2676/*
2677 * Duplicate Address Detection
2678 */
3c21edbd
YH		 2679static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2680{
2681 unsigned long rand_num;
2682 struct inet6_dev *idev = ifp->idev;
2683
95c385b4
NH		 2684 if (ifp->flags & IFA_F_OPTIMISTIC)
2685 rand_num = 0;
2686 else
2687 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2688
3c21edbd
YH		 2689 ifp->probes = idev->cnf.dad_transmits;
2690 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2691}
2692
e431b8c0 2693static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2694{
2695 struct inet6_dev *idev = ifp->idev;
2696 struct net_device *dev = idev->dev;
1da177e4
LT		 2697
2698 addrconf_join_solict(dev, &ifp->addr);
2699
1da177e4 2700 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2701
2702 read_lock_bh(&idev->lock);
2703 if (ifp->dead)
2704 goto out;
2705 spin_lock_bh(&ifp->lock);
2706
2707 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2708 !(ifp->flags&IFA_F_TENTATIVE) ||
2709 ifp->flags & IFA_F_NODAD) {
95c385b4 2710 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2711 spin_unlock_bh(&ifp->lock);
2712 read_unlock_bh(&idev->lock);
2713
2714 addrconf_dad_completed(ifp);
2715 return;
2716 }
2717
6732bade 2718 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2719 spin_unlock_bh(&ifp->lock);
6732bade 2720 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2721 /*
2722 * If the defice is not ready:
2723 * - keep it tentative if it is a permanent address.
2724 * - otherwise, kill it.
2725 */
2726 in6_ifa_hold(ifp);
2727 addrconf_dad_stop(ifp);
6732bade 2728 return;
3c21edbd 2729 }
95c385b4
NH		 2730
2731 /*
2732 * Optimistic nodes can start receiving
2733 * Frames right away
2734 */
2735 if(ifp->flags & IFA_F_OPTIMISTIC)
2736 ip6_ins_rt(ifp->rt);
2737
6732bade
YH		 2738 addrconf_dad_kick(ifp);
2739 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2740out:
2741 read_unlock_bh(&idev->lock);
2742}
2743
2744static void addrconf_dad_timer(unsigned long data)
2745{
2746 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2747 struct inet6_dev *idev = ifp->idev;
2748 struct in6_addr unspec;
2749 struct in6_addr mcaddr;
2750
2751 read_lock_bh(&idev->lock);
2752 if (idev->dead) {
2753 read_unlock_bh(&idev->lock);
2754 goto out;
2755 }
2756 spin_lock_bh(&ifp->lock);
2757 if (ifp->probes == 0) {
2758 /*
2759 * DAD was successful
2760 */
2761
95c385b4 2762 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2763 spin_unlock_bh(&ifp->lock);
2764 read_unlock_bh(&idev->lock);
2765
2766 addrconf_dad_completed(ifp);
2767
2768 goto out;
2769 }
2770
2771 ifp->probes--;
2772 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2773 spin_unlock_bh(&ifp->lock);
2774 read_unlock_bh(&idev->lock);
2775
2776 /* send a neighbour solicitation for our addr */
2777 memset(&unspec, 0, sizeof(unspec));
2778 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2779 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2780out:
2781 in6_ifa_put(ifp);
2782}
2783
2784static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2785{
2786 struct net_device * dev = ifp->idev->dev;
2787
2788 /*
2789 * Configure the address for reception. Now it is valid.
2790 */
2791
2792 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2793
2794 /* If added prefix is link local and forwarding is off,
2795 start sending router solicitations.
2796 */
2797
2798 if (ifp->idev->cnf.forwarding == 0 &&
2799 ifp->idev->cnf.rtr_solicits > 0 &&
2800 (dev->flags&IFF_LOOPBACK) == 0 &&
2801 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2802 /*
2803 * If a host as already performed a random delay
2804 * [...] as part of DAD [...] there is no need
2805 * to delay again before sending the first RS
2806 */
f3ee4010 2807 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2808
2809 spin_lock_bh(&ifp->lock);
2810 ifp->probes = 1;
2811 ifp->idev->if_flags |= IF_RS_SENT;
2812 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2813 spin_unlock_bh(&ifp->lock);
2814 }
2815}
2816
c5e33bdd
YH		 2817static void addrconf_dad_run(struct inet6_dev *idev) {
2818 struct inet6_ifaddr *ifp;
2819
2820 read_lock_bh(&idev->lock);
2821 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2822 spin_lock_bh(&ifp->lock);
2823 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2824 spin_unlock_bh(&ifp->lock);
2825 continue;
2826 }
2827 spin_unlock_bh(&ifp->lock);
2828 addrconf_dad_kick(ifp);
2829 }
2830 read_unlock_bh(&idev->lock);
2831}
2832
1da177e4
LT		 2833#ifdef CONFIG_PROC_FS
2834struct if6_iter_state {
3c40090a 2835 struct seq_net_private p;
1da177e4
LT		 2836 int bucket;
2837};
2838
2839static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2840{
2841 struct inet6_ifaddr *ifa = NULL;
2842 struct if6_iter_state *state = seq->private;
1218854a 2843 struct net *net = seq_file_net(seq);
1da177e4
LT		 2844
2845 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2846 ifa = inet6_addr_lst[state->bucket];
3c40090a 2847
878628fb 2848 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2849 ifa = ifa->lst_next;
1da177e4
LT		 2850 if (ifa)
2851 break;
2852 }
2853 return ifa;
2854}
2855
2856static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2857{
2858 struct if6_iter_state *state = seq->private;
1218854a 2859 struct net *net = seq_file_net(seq);
1da177e4
LT		 2860
2861 ifa = ifa->lst_next;
2862try_again:
3c40090a 2863 if (ifa) {
878628fb 2864 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2865 ifa = ifa->lst_next;
2866 goto try_again;
2867 }
2868 }
2869
1da177e4
LT		 2870 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2871 ifa = inet6_addr_lst[state->bucket];
2872 goto try_again;
2873 }
3c40090a 2874
1da177e4
LT		 2875 return ifa;
2876}
2877
2878static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2879{
2880 struct inet6_ifaddr *ifa = if6_get_first(seq);
2881
2882 if (ifa)
2883 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2884 --pos;
2885 return pos ? NULL : ifa;
2886}
2887
2888static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2889 __acquires(addrconf_hash_lock)
1da177e4
LT		 2890{
2891 read_lock_bh(&addrconf_hash_lock);
2892 return if6_get_idx(seq, *pos);
2893}
2894
2895static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2896{
2897 struct inet6_ifaddr *ifa;
2898
2899 ifa = if6_get_next(seq, v);
2900 ++*pos;
2901 return ifa;
2902}
2903
2904static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2905 __releases(addrconf_hash_lock)
1da177e4
LT		 2906{
2907 read_unlock_bh(&addrconf_hash_lock);
2908}
2909
2910static int if6_seq_show(struct seq_file *seq, void *v)
2911{
2912 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2913 seq_printf(seq,
9343e79a 2914 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2915 NIP6(ifp->addr),
2916 ifp->idev->dev->ifindex,
2917 ifp->prefix_len,
2918 ifp->scope,
2919 ifp->flags,
2920 ifp->idev->dev->name);
2921 return 0;
2922}
2923
56b3d975 2924static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2925 .start = if6_seq_start,
2926 .next = if6_seq_next,
2927 .show = if6_seq_show,
2928 .stop = if6_seq_stop,
2929};
2930
2931static int if6_seq_open(struct inode *inode, struct file *file)
2932{
3c40090a
DL		 2933 return seq_open_net(inode, file, &if6_seq_ops,
2934 sizeof(struct if6_iter_state));
1da177e4
LT		 2935}
2936
9a32144e 2937static const struct file_operations if6_fops = {
1da177e4
LT		 2938 .owner = THIS_MODULE,
2939 .open = if6_seq_open,
2940 .read = seq_read,
2941 .llseek = seq_lseek,
3c40090a 2942 .release = seq_release_net,
1da177e4
LT		 2943};
2944
3c40090a 2945static int if6_proc_net_init(struct net *net)
1da177e4 2946{
3c40090a 2947 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2948 return -ENOMEM;
2949 return 0;
2950}
2951
3c40090a
DL		 2952static void if6_proc_net_exit(struct net *net)
2953{
2954 proc_net_remove(net, "if_inet6");
2955}
2956
2957static struct pernet_operations if6_proc_net_ops = {
2958 .init = if6_proc_net_init,
2959 .exit = if6_proc_net_exit,
2960};
2961
2962int __init if6_proc_init(void)
2963{
2964 return register_pernet_subsys(&if6_proc_net_ops);
2965}
2966
1da177e4
LT		 2967void if6_proc_exit(void)
2968{
3c40090a 2969 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2970}
2971#endif /* CONFIG_PROC_FS */
2972
59fbb3a6 2973#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2974/* Check if address is a home address configured on any interface. */
389f6612 2975int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2976{
2977 int ret = 0;
2978 struct inet6_ifaddr * ifp;
2979 u8 hash = ipv6_addr_hash(addr);
2980 read_lock_bh(&addrconf_hash_lock);
2981 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 2982 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 2983 continue;
caad295f 2984 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 2985 (ifp->flags & IFA_F_HOMEADDRESS)) {
2986 ret = 1;
2987 break;
2988 }
2989 }
2990 read_unlock_bh(&addrconf_hash_lock);
2991 return ret;
2992}
2993#endif
2994
1da177e4
LT		 2995/*
2996 * Periodic address status verification
2997 */
2998
2999static void addrconf_verify(unsigned long foo)
3000{
3001 struct inet6_ifaddr *ifp;
3002 unsigned long now, next;
3003 int i;
3004
3005 spin_lock_bh(&addrconf_verify_lock);
3006 now = jiffies;
3007 next = now + ADDR_CHECK_FREQUENCY;
3008
3009 del_timer(&addr_chk_timer);
3010
3011 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3012
3013restart:
5d5780df 3014 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3015 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3016 unsigned long age;
3017#ifdef CONFIG_IPV6_PRIVACY
3018 unsigned long regen_advance;
3019#endif
3020
3021 if (ifp->flags & IFA_F_PERMANENT)
3022 continue;
3023
3024 spin_lock(&ifp->lock);
3025 age = (now - ifp->tstamp) / HZ;
3026
3027#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3028 regen_advance = ifp->idev->cnf.regen_max_retry *
3029 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3030 ifp->idev->nd_parms->retrans_time / HZ;
3031#endif
3032
8f27ebb9
YH		 3033 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3034 age >= ifp->valid_lft) {
1da177e4
LT		 3035 spin_unlock(&ifp->lock);
3036 in6_ifa_hold(ifp);
5d5780df 3037 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3038 ipv6_del_addr(ifp);
3039 goto restart;
8f27ebb9
YH		 3040 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3041 spin_unlock(&ifp->lock);
3042 continue;
1da177e4
LT		 3043 } else if (age >= ifp->prefered_lft) {
3044 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3045 int deprecate = 0;
3046
3047 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3048 deprecate = 1;
3049 ifp->flags |= IFA_F_DEPRECATED;
3050 }
3051
3052 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3053 next = ifp->tstamp + ifp->valid_lft * HZ;
3054
3055 spin_unlock(&ifp->lock);
3056
3057 if (deprecate) {
3058 in6_ifa_hold(ifp);
5d5780df 3059 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3060
3061 ipv6_ifa_notify(0, ifp);
3062 in6_ifa_put(ifp);
3063 goto restart;
3064 }
3065#ifdef CONFIG_IPV6_PRIVACY
3066 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3067 !(ifp->flags&IFA_F_TENTATIVE)) {
3068 if (age >= ifp->prefered_lft - regen_advance) {
3069 struct inet6_ifaddr *ifpub = ifp->ifpub;
3070 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3071 next = ifp->tstamp + ifp->prefered_lft * HZ;
3072 if (!ifp->regen_count && ifpub) {
3073 ifp->regen_count++;
3074 in6_ifa_hold(ifp);
3075 in6_ifa_hold(ifpub);
3076 spin_unlock(&ifp->lock);
5d5780df 3077 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3078 spin_lock(&ifpub->lock);
3079 ifpub->regen_count = 0;
3080 spin_unlock(&ifpub->lock);
1da177e4
LT		 3081 ipv6_create_tempaddr(ifpub, ifp);
3082 in6_ifa_put(ifpub);
3083 in6_ifa_put(ifp);
3084 goto restart;
3085 }
3086 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3087 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3088 spin_unlock(&ifp->lock);
3089#endif
3090 } else {
3091 /* ifp->prefered_lft <= ifp->valid_lft */
3092 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3093 next = ifp->tstamp + ifp->prefered_lft * HZ;
3094 spin_unlock(&ifp->lock);
3095 }
3096 }
5d5780df 3097 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3098 }
3099
3100 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3101 add_timer(&addr_chk_timer);
3102 spin_unlock_bh(&addrconf_verify_lock);
3103}
3104
461d8837
TG		 3105static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3106{
3107 struct in6_addr *pfx = NULL;
3108
3109 if (addr)
3110 pfx = nla_data(addr);
3111
3112 if (local) {
3113 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3114 pfx = NULL;
3115 else
3116 pfx = nla_data(local);
3117 }
3118
3119 return pfx;
3120}
3121
ef7c79ed 3122static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3123 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3124 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3125 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3126};
3127
1da177e4
LT		 3128static int
3129inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3130{
3b1e0a65 3131 struct net *net = sock_net(skb->sk);
b933f716
TG		 3132 struct ifaddrmsg *ifm;
3133 struct nlattr *tb[IFA_MAX+1];
1da177e4 3134 struct in6_addr *pfx;
b933f716 3135 int err;
1da177e4 3136
b933f716
TG		 3137 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3138 if (err < 0)
3139 return err;
3140
3141 ifm = nlmsg_data(nlh);
3142 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3143 if (pfx == NULL)
3144 return -EINVAL;
3145
af284937 3146 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3147}
3148
55ebaef1
NT		 3149static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3150 u32 prefered_lft, u32 valid_lft)
081bba5b 3151{
46d48046
YH		 3152 u32 flags = RTF_EXPIRES;
3153
081bba5b
NT		 3154 if (!valid_lft || (prefered_lft > valid_lft))
3155 return -EINVAL;
3156
46d48046 3157 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3158 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3159 flags = 0;
3160 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3161 valid_lft = 0x7FFFFFFF/HZ;
3162
3163 if (prefered_lft == 0)
55ebaef1 3164 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3165 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3166 (prefered_lft != INFINITY_LIFE_TIME))
3167 prefered_lft = 0x7FFFFFFF/HZ;
3168
3169 spin_lock_bh(&ifp->lock);
3b9f9a1c 3170 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3171 ifp->tstamp = jiffies;
3172 ifp->valid_lft = valid_lft;
3173 ifp->prefered_lft = prefered_lft;
3174
3175 spin_unlock_bh(&ifp->lock);
3176 if (!(ifp->flags&IFA_F_TENTATIVE))
3177 ipv6_ifa_notify(0, ifp);
081bba5b 3178
46d48046
YH		 3179 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3180 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3181 addrconf_verify(0);
3182
3183 return 0;
3184}
3185
1da177e4
LT		 3186static int
3187inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3188{
3b1e0a65 3189 struct net *net = sock_net(skb->sk);
461d8837
TG		 3190 struct ifaddrmsg *ifm;
3191 struct nlattr *tb[IFA_MAX+1];
1da177e4 3192 struct in6_addr *pfx;
7198f8ce
TG		 3193 struct inet6_ifaddr *ifa;
3194 struct net_device *dev;
55ebaef1
NT		 3195 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3196 u8 ifa_flags;
461d8837 3197 int err;
1da177e4 3198
461d8837
TG		 3199 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3200 if (err < 0)
3201 return err;
3202
3203 ifm = nlmsg_data(nlh);
3204 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3205 if (pfx == NULL)
3206 return -EINVAL;
3207
461d8837 3208 if (tb[IFA_CACHEINFO]) {
0778769d 3209 struct ifa_cacheinfo *ci;
461d8837
TG		 3210
3211 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3212 valid_lft = ci->ifa_valid;
461d8837
TG		 3213 preferred_lft = ci->ifa_prefered;
3214 } else {
3215 preferred_lft = INFINITY_LIFE_TIME;
3216 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3217 }
3218
af284937 3219 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3220 if (dev == NULL)
3221 return -ENODEV;
3222
55ebaef1 3223 /* We ignore other flags so far. */
3b9f9a1c 3224 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3225
1cab3da6 3226 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3227 if (ifa == NULL) {
3228 /*
3229 * It would be best to check for !NLM_F_CREATE here but
3230 * userspace alreay relies on not having to provide this.
3231 */
af284937
DL		 3232 return inet6_addr_add(net, ifm->ifa_index, pfx,
3233 ifm->ifa_prefixlen, ifa_flags,
3234 preferred_lft, valid_lft);
081bba5b
NT		 3235 }
3236
7198f8ce
TG		 3237 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3238 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3239 err = -EEXIST;
3240 else
55ebaef1 3241 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3242
3243 in6_ifa_put(ifa);
3244
3245 return err;
1da177e4
LT		 3246}
3247
101bb229
TG		 3248static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3249 u8 scope, int ifindex)
3250{
3251 struct ifaddrmsg *ifm;
3252
3253 ifm = nlmsg_data(nlh);
3254 ifm->ifa_family = AF_INET6;
3255 ifm->ifa_prefixlen = prefixlen;
3256 ifm->ifa_flags = flags;
3257 ifm->ifa_scope = scope;
3258 ifm->ifa_index = ifindex;
3259}
3260
85486af0
TG		 3261static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3262 unsigned long tstamp, u32 preferred, u32 valid)
3263{
3264 struct ifa_cacheinfo ci;
3265
3266 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3267 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3268 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3269 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3270 ci.ifa_prefered = preferred;
3271 ci.ifa_valid = valid;
3272
3273 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3274}
3275
101bb229
TG		 3276static inline int rt_scope(int ifa_scope)
3277{
3278 if (ifa_scope & IFA_HOST)
3279 return RT_SCOPE_HOST;
3280 else if (ifa_scope & IFA_LINK)
3281 return RT_SCOPE_LINK;
3282 else if (ifa_scope & IFA_SITE)
3283 return RT_SCOPE_SITE;
3284 else
3285 return RT_SCOPE_UNIVERSE;
3286}
3287
0ab6803b
TG		 3288static inline int inet6_ifaddr_msgsize(void)
3289{
339bf98f
TG		 3290 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3291 + nla_total_size(16) /* IFA_ADDRESS */
3292 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3293}
c5396a31 3294
1da177e4 3295static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3296 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3297{
1da177e4 3298 struct nlmsghdr *nlh;
85486af0 3299 u32 preferred, valid;
1da177e4 3300
0ab6803b
TG		 3301 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3302 if (nlh == NULL)
26932566 3303 return -EMSGSIZE;
0ab6803b 3304
101bb229
TG		 3305 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3306 ifa->idev->dev->ifindex);
3307
1da177e4 3308 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3309 preferred = ifa->prefered_lft;
3310 valid = ifa->valid_lft;
3311 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3312 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3313 preferred -= tval;
3314 if (valid != INFINITY_LIFE_TIME)
3315 valid -= tval;
1da177e4
LT		 3316 }
3317 } else {
85486af0
TG		 3318 preferred = INFINITY_LIFE_TIME;
3319 valid = INFINITY_LIFE_TIME;
3320 }
3321
0ab6803b 3322 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3323 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3324 nlmsg_cancel(skb, nlh);
3325 return -EMSGSIZE;
3326 }
1da177e4 3327
0ab6803b 3328 return nlmsg_end(skb, nlh);
1da177e4
LT		 3329}
3330
3331static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3332 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3333{
1da177e4 3334 struct nlmsghdr *nlh;
101bb229
TG		 3335 u8 scope = RT_SCOPE_UNIVERSE;
3336 int ifindex = ifmca->idev->dev->ifindex;
3337
3338 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3339 scope = RT_SCOPE_SITE;
1da177e4 3340
0ab6803b
TG		 3341 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3342 if (nlh == NULL)
26932566 3343 return -EMSGSIZE;
85486af0 3344
0ab6803b
TG		 3345 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3346 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3347 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3348 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3349 nlmsg_cancel(skb, nlh);
3350 return -EMSGSIZE;
3351 }
85486af0 3352
0ab6803b 3353 return nlmsg_end(skb, nlh);
1da177e4
LT		 3354}
3355
3356static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3357 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3358{
1da177e4 3359 struct nlmsghdr *nlh;
101bb229
TG		 3360 u8 scope = RT_SCOPE_UNIVERSE;
3361 int ifindex = ifaca->aca_idev->dev->ifindex;
3362
3363 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3364 scope = RT_SCOPE_SITE;
1da177e4 3365
0ab6803b
TG		 3366 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3367 if (nlh == NULL)
26932566 3368 return -EMSGSIZE;
85486af0 3369
0ab6803b
TG		 3370 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3371 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3372 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3373 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3374 nlmsg_cancel(skb, nlh);
3375 return -EMSGSIZE;
3376 }
1da177e4 3377
0ab6803b 3378 return nlmsg_end(skb, nlh);
1da177e4
LT		 3379}
3380
3381enum addr_type_t
3382{
3383 UNICAST_ADDR,
3384 MULTICAST_ADDR,
3385 ANYCAST_ADDR,
3386};
3387
3388static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3389 enum addr_type_t type)
3390{
3391 int idx, ip_idx;
3392 int s_idx, s_ip_idx;
3393 int err = 1;
3394 struct net_device *dev;
3395 struct inet6_dev *idev = NULL;
3396 struct inet6_ifaddr *ifa;
3397 struct ifmcaddr6 *ifmca;
3398 struct ifacaddr6 *ifaca;
3b1e0a65 3399 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3400
3401 s_idx = cb->args[0];
3402 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3403
7562f876 3404 idx = 0;
6fda7350 3405 for_each_netdev(net, dev) {
1da177e4 3406 if (idx < s_idx)
7562f876 3407 goto cont;
1da177e4
LT		 3408 if (idx > s_idx)
3409 s_ip_idx = 0;
3410 ip_idx = 0;
3411 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3412 goto cont;
1da177e4
LT		 3413 read_lock_bh(&idev->lock);
3414 switch (type) {
3415 case UNICAST_ADDR:
ae9cda5d 3416 /* unicast address incl. temp addr */
1da177e4
LT		 3417 for (ifa = idev->addr_list; ifa;
3418 ifa = ifa->if_next, ip_idx++) {
3419 if (ip_idx < s_ip_idx)
3420 continue;
5d5619b4
YH		 3421 err = inet6_fill_ifaddr(skb, ifa,
3422 NETLINK_CB(cb->skb).pid,
3423 cb->nlh->nlmsg_seq,
3424 RTM_NEWADDR,
3425 NLM_F_MULTI);
1da177e4 3426 }
1da177e4
LT		 3427 break;
3428 case MULTICAST_ADDR:
3429 /* multicast address */
1ab1457c 3430 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3431 ifmca = ifmca->next, ip_idx++) {
3432 if (ip_idx < s_ip_idx)
3433 continue;
5d5619b4
YH		 3434 err = inet6_fill_ifmcaddr(skb, ifmca,
3435 NETLINK_CB(cb->skb).pid,
3436 cb->nlh->nlmsg_seq,
3437 RTM_GETMULTICAST,
3438 NLM_F_MULTI);
1da177e4
LT		 3439 }
3440 break;
3441 case ANYCAST_ADDR:
3442 /* anycast address */
3443 for (ifaca = idev->ac_list; ifaca;
3444 ifaca = ifaca->aca_next, ip_idx++) {
3445 if (ip_idx < s_ip_idx)
3446 continue;
5d5619b4
YH		 3447 err = inet6_fill_ifacaddr(skb, ifaca,
3448 NETLINK_CB(cb->skb).pid,
3449 cb->nlh->nlmsg_seq,
3450 RTM_GETANYCAST,
3451 NLM_F_MULTI);
1da177e4
LT		 3452 }
3453 break;
3454 default:
3455 break;
3456 }
3457 read_unlock_bh(&idev->lock);
3458 in6_dev_put(idev);
5d5619b4
YH		 3459
3460 if (err <= 0)
3461 break;
7562f876
PE		 3462cont:
3463 idx++;
1da177e4 3464 }
1da177e4
LT		 3465 cb->args[0] = idx;
3466 cb->args[1] = ip_idx;
3467 return skb->len;
3468}
3469
3470static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3471{
3472 enum addr_type_t type = UNICAST_ADDR;
b854272b 3473
1da177e4
LT		 3474 return inet6_dump_addr(skb, cb, type);
3475}
3476
3477static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3478{
3479 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3480
1da177e4
LT		 3481 return inet6_dump_addr(skb, cb, type);
3482}
3483
3484
3485static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3486{
3487 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3488
1da177e4
LT		 3489 return inet6_dump_addr(skb, cb, type);
3490}
3491
1b29fc2c
TG		 3492static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3493 void *arg)
6c223828 3494{
3b1e0a65 3495 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3496 struct ifaddrmsg *ifm;
3497 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3498 struct in6_addr *addr = NULL;
3499 struct net_device *dev = NULL;
3500 struct inet6_ifaddr *ifa;
3501 struct sk_buff *skb;
6c223828
NT		 3502 int err;
3503
1b29fc2c
TG		 3504 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3505 if (err < 0)
3506 goto errout;
3507
3508 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3509 if (addr == NULL) {
3510 err = -EINVAL;
3511 goto errout;
6c223828 3512 }
6c223828 3513
1b29fc2c 3514 ifm = nlmsg_data(nlh);
6c223828 3515 if (ifm->ifa_index)
6fda7350 3516 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3517
1cab3da6 3518 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3519 err = -EADDRNOTAVAIL;
3520 goto errout;
3521 }
6c223828 3522
0ab6803b 3523 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3524 err = -ENOBUFS;
1b29fc2c 3525 goto errout_ifa;
6c223828
NT		 3526 }
3527
6c223828
NT		 3528 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3529 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3530 if (err < 0) {
3531 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3532 WARN_ON(err == -EMSGSIZE);
3533 kfree_skb(skb);
3534 goto errout_ifa;
3535 }
6fda7350 3536 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3537errout_ifa:
6c223828 3538 in6_ifa_put(ifa);
1b29fc2c 3539errout:
6c223828 3540 return err;
6c223828
NT		 3541}
3542
1da177e4
LT		 3543static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3544{
3545 struct sk_buff *skb;
c346dca1 3546 struct net *net = dev_net(ifa->idev->dev);
5d620266 3547 int err = -ENOBUFS;
1da177e4 3548
0ab6803b 3549 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3550 if (skb == NULL)
3551 goto errout;
3552
3553 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3554 if (err < 0) {
3555 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3556 WARN_ON(err == -EMSGSIZE);
3557 kfree_skb(skb);
3558 goto errout;
3559 }
6fda7350 3560 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3561errout:
3562 if (err < 0)
6fda7350 3563 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3564}
3565
b6f99a21 3566static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3567 __s32 *array, int bytes)
3568{
04561c1f
TG		 3569 BUG_ON(bytes < (DEVCONF_MAX * 4));
3570
1da177e4
LT		 3571 memset(array, 0, bytes);
3572 array[DEVCONF_FORWARDING] = cnf->forwarding;
3573 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3574 array[DEVCONF_MTU6] = cnf->mtu6;
3575 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3576 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3577 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3578 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3579 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3580 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3581 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3582 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3583#ifdef CONFIG_IPV6_PRIVACY
3584 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3585 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3586 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3587 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3588 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3589#endif
3590 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3591 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3592 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3593#ifdef CONFIG_IPV6_ROUTER_PREF
3594 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3595 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3596#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3597 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3598#endif
930d6ff2 3599#endif
fbea49e1 3600 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3601 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3602#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3603 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3604#endif
7bc570c8
YH		 3605#ifdef CONFIG_IPV6_MROUTE
3606 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3607#endif
1da177e4
LT		 3608}
3609
339bf98f
TG		 3610static inline size_t inet6_if_nlmsg_size(void)
3611{
3612 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3613 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3614 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3615 + nla_total_size(4) /* IFLA_MTU */
3616 + nla_total_size(4) /* IFLA_LINK */
3617 + nla_total_size( /* IFLA_PROTINFO */
3618 nla_total_size(4) /* IFLA_INET6_FLAGS */
3619 + nla_total_size(sizeof(struct ifla_cacheinfo))
3620 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3621 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3622 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3623 );
3624}
c5396a31 3625
7f7d9a6b
HX		 3626static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3627 int bytes)
3628{
3629 int i;
3630 int pad = bytes - sizeof(u64) * items;
3631 BUG_ON(pad < 0);
3632
3633 /* Use put_unaligned() because stats may not be aligned for u64. */
3634 put_unaligned(items, &stats[0]);
3635 for (i = 1; i < items; i++)
3636 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3637
3638 memset(&stats[items], 0, pad);
3639}
3640
3641static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3642 int bytes)
3643{
3644 switch(attrtype) {
3645 case IFLA_INET6_STATS:
3646 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3647 break;
3648 case IFLA_INET6_ICMP6STATS:
3649 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3650 break;
3651 }
3652}
3653
1ab1457c 3654static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3655 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3656{
04561c1f 3657 struct net_device *dev = idev->dev;
bf99f1bd 3658 struct nlattr *nla;
04561c1f
TG		 3659 struct ifinfomsg *hdr;
3660 struct nlmsghdr *nlh;
3661 void *protoinfo;
3662 struct ifla_cacheinfo ci;
3663
3664 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3665 if (nlh == NULL)
26932566 3666 return -EMSGSIZE;
04561c1f
TG		 3667
3668 hdr = nlmsg_data(nlh);
3669 hdr->ifi_family = AF_INET6;
3670 hdr->__ifi_pad = 0;
3671 hdr->ifi_type = dev->type;
3672 hdr->ifi_index = dev->ifindex;
3673 hdr->ifi_flags = dev_get_flags(dev);
3674 hdr->ifi_change = 0;
3675
3676 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3677
3678 if (dev->addr_len)
04561c1f 3679 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3680
04561c1f 3681 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3682 if (dev->ifindex != dev->iflink)
04561c1f 3683 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3684
04561c1f
TG		 3685 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3686 if (protoinfo == NULL)
3687 goto nla_put_failure;
1da177e4 3688
04561c1f 3689 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3690
1da177e4
LT		 3691 ci.max_reasm_len = IPV6_MAXPLEN;
3692 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3693 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3694 ci.reachable_time = idev->nd_parms->reachable_time;
3695 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3696 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3697
bf99f1bd
YH		 3698 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3699 if (nla == NULL)
04561c1f 3700 goto nla_put_failure;
bf99f1bd 3701 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3702
bf99f1bd
YH		 3703 /* XXX - MC not implemented */
3704
3705 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3706 if (nla == NULL)
3707 goto nla_put_failure;
3708 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3709
3710 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3711 if (nla == NULL)
3712 goto nla_put_failure;
3713 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3714
04561c1f
TG		 3715 nla_nest_end(skb, protoinfo);
3716 return nlmsg_end(skb, nlh);
1da177e4 3717
04561c1f 3718nla_put_failure:
26932566
PM		 3719 nlmsg_cancel(skb, nlh);
3720 return -EMSGSIZE;
1da177e4
LT		 3721}
3722
3723static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3724{
3b1e0a65 3725 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3726 int idx, err;
3727 int s_idx = cb->args[0];
3728 struct net_device *dev;
3729 struct inet6_dev *idev;
3730
3731 read_lock(&dev_base_lock);
7562f876 3732 idx = 0;
6fda7350 3733 for_each_netdev(net, dev) {
1da177e4 3734 if (idx < s_idx)
7562f876 3735 goto cont;
1da177e4 3736 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3737 goto cont;
1ab1457c 3738 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3739 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3740 in6_dev_put(idev);
3741 if (err <= 0)
3742 break;
7562f876
PE		 3743cont:
3744 idx++;
1da177e4
LT		 3745 }
3746 read_unlock(&dev_base_lock);
3747 cb->args[0] = idx;
3748
3749 return skb->len;
3750}
3751
3752void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3753{
3754 struct sk_buff *skb;
c346dca1 3755 struct net *net = dev_net(idev->dev);
8d7a76c9 3756 int err = -ENOBUFS;
1ab1457c 3757
339bf98f 3758 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3759 if (skb == NULL)
3760 goto errout;
3761
3762 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3763 if (err < 0) {
3764 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3765 WARN_ON(err == -EMSGSIZE);
3766 kfree_skb(skb);
3767 goto errout;
3768 }
6fda7350 3769 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3770errout:
3771 if (err < 0)
6fda7350 3772 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3773}
3774
339bf98f
TG		 3775static inline size_t inet6_prefix_nlmsg_size(void)
3776{
3777 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3778 + nla_total_size(sizeof(struct in6_addr))
3779 + nla_total_size(sizeof(struct prefix_cacheinfo));
3780}
c5396a31 3781
1da177e4 3782static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3783 struct prefix_info *pinfo, u32 pid, u32 seq,
3784 int event, unsigned int flags)
1da177e4 3785{
6051e2f4
TG		 3786 struct prefixmsg *pmsg;
3787 struct nlmsghdr *nlh;
1da177e4
LT		 3788 struct prefix_cacheinfo ci;
3789
6051e2f4
TG		 3790 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3791 if (nlh == NULL)
26932566 3792 return -EMSGSIZE;
6051e2f4
TG		 3793
3794 pmsg = nlmsg_data(nlh);
1da177e4 3795 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3796 pmsg->prefix_pad1 = 0;
3797 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3798 pmsg->prefix_ifindex = idev->dev->ifindex;
3799 pmsg->prefix_len = pinfo->prefix_len;
3800 pmsg->prefix_type = pinfo->type;
8a47077a 3801 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3802 pmsg->prefix_flags = 0;
3803 if (pinfo->onlink)
3804 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3805 if (pinfo->autoconf)
3806 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3807
6051e2f4 3808 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3809
3810 ci.preferred_time = ntohl(pinfo->prefered);
3811 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3812 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3813
6051e2f4 3814 return nlmsg_end(skb, nlh);
1da177e4 3815
6051e2f4 3816nla_put_failure:
26932566
PM		 3817 nlmsg_cancel(skb, nlh);
3818 return -EMSGSIZE;
1da177e4
LT		 3819}
3820
1ab1457c 3821static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3822 struct prefix_info *pinfo)
3823{
3824 struct sk_buff *skb;
c346dca1 3825 struct net *net = dev_net(idev->dev);
8c384bfa 3826 int err = -ENOBUFS;
1da177e4 3827
339bf98f 3828 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3829 if (skb == NULL)
3830 goto errout;
3831
3832 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3833 if (err < 0) {
3834 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3835 WARN_ON(err == -EMSGSIZE);
3836 kfree_skb(skb);
3837 goto errout;
3838 }
6fda7350 3839 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3840errout:
3841 if (err < 0)
6fda7350 3842 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3843}
3844
1da177e4
LT		 3845static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3846{
3847 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3848
3849 switch (event) {
3850 case RTM_NEWADDR:
95c385b4
NH		 3851 /*
3852 * If the address was optimistic
3853 * we inserted the route at the start of
3854 * our DAD process, so we don't need
3855 * to do it again
3856 */
3857 if (!(ifp->rt->rt6i_node))
3858 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3859 if (ifp->idev->cnf.forwarding)
3860 addrconf_join_anycast(ifp);
3861 break;
3862 case RTM_DELADDR:
3863 if (ifp->idev->cnf.forwarding)
3864 addrconf_leave_anycast(ifp);
3865 addrconf_leave_solict(ifp->idev, &ifp->addr);
3866 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3867 if (ip6_del_rt(ifp->rt))
1da177e4 3868 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3869 break;
3870 }
3871}
3872
3873static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3874{
8814c4b5 3875 rcu_read_lock_bh();
1da177e4
LT		 3876 if (likely(ifp->idev->dead == 0))
3877 __ipv6_ifa_notify(event, ifp);
8814c4b5 3878 rcu_read_unlock_bh();
1da177e4
LT		 3879}
3880
3881#ifdef CONFIG_SYSCTL
3882
3883static
3884int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3885 void __user *buffer, size_t *lenp, loff_t *ppos)
3886{
3887 int *valp = ctl->data;
3888 int val = *valp;
3889 int ret;
3890
3891 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3892
c8fecf22
PE		 3893 if (write)
3894 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3895 return ret;
1da177e4
LT		 3896}
3897
1ab1457c 3898static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3899 int __user *name, int nlen,
3900 void __user *oldval,
3901 size_t __user *oldlenp,
1f29bcd7 3902 void __user *newval, size_t newlen)
1da177e4
LT		 3903{
3904 int *valp = table->data;
c8fecf22 3905 int val = *valp;
1da177e4
LT		 3906 int new;
3907
3908 if (!newval || !newlen)
3909 return 0;
3910 if (newlen != sizeof(int))
3911 return -EINVAL;
3912 if (get_user(new, (int __user *)newval))
3913 return -EFAULT;
3914 if (new == *valp)
3915 return 0;
3916 if (oldval && oldlenp) {
3917 size_t len;
3918 if (get_user(len, oldlenp))
3919 return -EFAULT;
3920 if (len) {
3921 if (len > table->maxlen)
3922 len = table->maxlen;
3923 if (copy_to_user(oldval, valp, len))
3924 return -EFAULT;
3925 if (put_user(len, oldlenp))
3926 return -EFAULT;
3927 }
3928 }
3929
c8fecf22
PE		 3930 *valp = new;
3931 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3932 return 1;
3933}
3934
3935static struct addrconf_sysctl_table
3936{
3937 struct ctl_table_header *sysctl_header;
f6a07b29 3938 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 3939 char *dev_name;
ab32ea5d 3940} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3941 .sysctl_header = NULL,
3942 .addrconf_vars = {
1ab1457c 3943 {
1da177e4
LT		 3944 .ctl_name = NET_IPV6_FORWARDING,
3945 .procname = "forwarding",
1ab1457c 3946 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3947 .maxlen = sizeof(int),
3948 .mode = 0644,
1ab1457c 3949 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3950 .strategy = &addrconf_sysctl_forward_strategy,
3951 },
3952 {
3953 .ctl_name = NET_IPV6_HOP_LIMIT,
3954 .procname = "hop_limit",
1ab1457c 3955 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3956 .maxlen = sizeof(int),
3957 .mode = 0644,
3958 .proc_handler = proc_dointvec,
3959 },
3960 {
3961 .ctl_name = NET_IPV6_MTU,
3962 .procname = "mtu",
3963 .data = &ipv6_devconf.mtu6,
1ab1457c 3964 .maxlen = sizeof(int),
1da177e4 3965 .mode = 0644,
1ab1457c 3966 .proc_handler = &proc_dointvec,
1da177e4
LT		 3967 },
3968 {
3969 .ctl_name = NET_IPV6_ACCEPT_RA,
3970 .procname = "accept_ra",
1ab1457c 3971 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3972 .maxlen = sizeof(int),
3973 .mode = 0644,
1ab1457c 3974 .proc_handler = &proc_dointvec,
1da177e4
LT		 3975 },
3976 {
3977 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3978 .procname = "accept_redirects",
1ab1457c 3979 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3980 .maxlen = sizeof(int),
3981 .mode = 0644,
1ab1457c 3982 .proc_handler = &proc_dointvec,
1da177e4
LT		 3983 },
3984 {
3985 .ctl_name = NET_IPV6_AUTOCONF,
3986 .procname = "autoconf",
1ab1457c 3987 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3988 .maxlen = sizeof(int),
3989 .mode = 0644,
1ab1457c 3990 .proc_handler = &proc_dointvec,
1da177e4
LT		 3991 },
3992 {
3993 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3994 .procname = "dad_transmits",
1ab1457c 3995 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3996 .maxlen = sizeof(int),
3997 .mode = 0644,
1ab1457c 3998 .proc_handler = &proc_dointvec,
1da177e4
LT		 3999 },
4000 {
4001 .ctl_name = NET_IPV6_RTR_SOLICITS,
4002 .procname = "router_solicitations",
1ab1457c 4003 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4004 .maxlen = sizeof(int),
4005 .mode = 0644,
1ab1457c 4006 .proc_handler = &proc_dointvec,
1da177e4
LT		 4007 },
4008 {
4009 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4010 .procname = "router_solicitation_interval",
1ab1457c 4011 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4012 .maxlen = sizeof(int),
4013 .mode = 0644,
1ab1457c 4014 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 4015 .strategy = &sysctl_jiffies,
4016 },
4017 {
4018 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4019 .procname = "router_solicitation_delay",
1ab1457c 4020 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4021 .maxlen = sizeof(int),
4022 .mode = 0644,
1ab1457c 4023 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 4024 .strategy = &sysctl_jiffies,
4025 },
4026 {
4027 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4028 .procname = "force_mld_version",
1ab1457c 4029 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4030 .maxlen = sizeof(int),
4031 .mode = 0644,
1ab1457c 4032 .proc_handler = &proc_dointvec,
1da177e4
LT		 4033 },
4034#ifdef CONFIG_IPV6_PRIVACY
4035 {
4036 .ctl_name = NET_IPV6_USE_TEMPADDR,
4037 .procname = "use_tempaddr",
1ab1457c 4038 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4039 .maxlen = sizeof(int),
4040 .mode = 0644,
1ab1457c 4041 .proc_handler = &proc_dointvec,
1da177e4
LT		 4042 },
4043 {
4044 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4045 .procname = "temp_valid_lft",
1ab1457c 4046 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4047 .maxlen = sizeof(int),
4048 .mode = 0644,
1ab1457c 4049 .proc_handler = &proc_dointvec,
1da177e4
LT		 4050 },
4051 {
4052 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4053 .procname = "temp_prefered_lft",
1ab1457c 4054 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4055 .maxlen = sizeof(int),
4056 .mode = 0644,
1ab1457c 4057 .proc_handler = &proc_dointvec,
1da177e4
LT		 4058 },
4059 {
4060 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4061 .procname = "regen_max_retry",
1ab1457c 4062 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4063 .maxlen = sizeof(int),
4064 .mode = 0644,
1ab1457c 4065 .proc_handler = &proc_dointvec,
1da177e4
LT		 4066 },
4067 {
4068 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4069 .procname = "max_desync_factor",
1ab1457c 4070 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4071 .maxlen = sizeof(int),
4072 .mode = 0644,
1ab1457c 4073 .proc_handler = &proc_dointvec,
1da177e4
LT		 4074 },
4075#endif
4076 {
4077 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4078 .procname = "max_addresses",
4079 .data = &ipv6_devconf.max_addresses,
4080 .maxlen = sizeof(int),
4081 .mode = 0644,
4082 .proc_handler = &proc_dointvec,
4083 },
65f5c7c1
YH		 4084 {
4085 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4086 .procname = "accept_ra_defrtr",
1ab1457c 4087 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4088 .maxlen = sizeof(int),
4089 .mode = 0644,
1ab1457c 4090 .proc_handler = &proc_dointvec,
65f5c7c1 4091 },
c4fd30eb
YH		 4092 {
4093 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4094 .procname = "accept_ra_pinfo",
1ab1457c 4095 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4096 .maxlen = sizeof(int),
4097 .mode = 0644,
1ab1457c 4098 .proc_handler = &proc_dointvec,
c4fd30eb 4099 },
930d6ff2
YH		 4100#ifdef CONFIG_IPV6_ROUTER_PREF
4101 {
4102 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4103 .procname = "accept_ra_rtr_pref",
4104 .data = &ipv6_devconf.accept_ra_rtr_pref,
4105 .maxlen = sizeof(int),
4106 .mode = 0644,
4107 .proc_handler = &proc_dointvec,
4108 },
52e16356
YH		 4109 {
4110 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4111 .procname = "router_probe_interval",
4112 .data = &ipv6_devconf.rtr_probe_interval,
4113 .maxlen = sizeof(int),
4114 .mode = 0644,
4115 .proc_handler = &proc_dointvec_jiffies,
4116 .strategy = &sysctl_jiffies,
4117 },
fa03ef38 4118#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4119 {
4120 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4121 .procname = "accept_ra_rt_info_max_plen",
4122 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4123 .maxlen = sizeof(int),
4124 .mode = 0644,
4125 .proc_handler = &proc_dointvec,
4126 },
4127#endif
930d6ff2 4128#endif
fbea49e1
YH		 4129 {
4130 .ctl_name = NET_IPV6_PROXY_NDP,
4131 .procname = "proxy_ndp",
4132 .data = &ipv6_devconf.proxy_ndp,
4133 .maxlen = sizeof(int),
4134 .mode = 0644,
4135 .proc_handler = &proc_dointvec,
4136 },
0bcbc926
YH		 4137 {
4138 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4139 .procname = "accept_source_route",
4140 .data = &ipv6_devconf.accept_source_route,
4141 .maxlen = sizeof(int),
4142 .mode = 0644,
4143 .proc_handler = &proc_dointvec,
4144 },
95c385b4
NH		 4145#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4146 {
4147 .ctl_name = CTL_UNNUMBERED,
4148 .procname = "optimistic_dad",
4149 .data = &ipv6_devconf.optimistic_dad,
4150 .maxlen = sizeof(int),
4151 .mode = 0644,
4152 .proc_handler = &proc_dointvec,
4153
4154 },
7bc570c8
YH		 4155#endif
4156#ifdef CONFIG_IPV6_MROUTE
4157 {
4158 .ctl_name = CTL_UNNUMBERED,
4159 .procname = "mc_forwarding",
4160 .data = &ipv6_devconf.mc_forwarding,
4161 .maxlen = sizeof(int),
4162 .mode = 0644,
4163 .proc_handler = &proc_dointvec,
4164 },
95c385b4 4165#endif
1da177e4
LT		 4166 {
4167 .ctl_name = 0, /* sentinel */
4168 }
4169 },
1da177e4
LT		 4170};
4171
bff16c2f
PE		 4172static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4173 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4174{
4175 int i;
1da177e4 4176 struct addrconf_sysctl_table *t;
1da177e4 4177
1dab6222
PE		 4178#define ADDRCONF_CTL_PATH_DEV 3
4179
4180 struct ctl_path addrconf_ctl_path[] = {
4181 { .procname = "net", .ctl_name = CTL_NET, },
4182 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4183 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4184 { /* to be set */ },
4185 { },
4186 };
4187
4188
af879cc7 4189 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4190 if (t == NULL)
f68635e6
PE		 4191 goto out;
4192
1da177e4
LT		 4193 for (i=0; t->addrconf_vars[i].data; i++) {
4194 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4195 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4196 t->addrconf_vars[i].extra2 = net;
1da177e4 4197 }
1da177e4 4198
1ab1457c
YH		 4199 /*
4200 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4201 * by sysctl and we wouldn't want anyone to change it under our feet
4202 * (see SIOCSIFNAME).
1ab1457c 4203 */
1dab6222
PE		 4204 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4205 if (!t->dev_name)
f68635e6 4206 goto free;
1da177e4 4207
1dab6222
PE		 4208 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4209 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4210
bff16c2f 4211 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4212 t->addrconf_vars);
1da177e4
LT		 4213 if (t->sysctl_header == NULL)
4214 goto free_procname;
f68635e6
PE		 4215
4216 p->sysctl = t;
95897312 4217 return 0;
1da177e4 4218
f68635e6 4219free_procname:
1dab6222 4220 kfree(t->dev_name);
f68635e6 4221free:
1da177e4 4222 kfree(t);
f68635e6 4223out:
95897312 4224 return -ENOBUFS;
1da177e4
LT		 4225}
4226
408c4768
PE		 4227static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4228{
4229 struct addrconf_sysctl_table *t;
4230
4231 if (p->sysctl == NULL)
4232 return;
4233
4234 t = p->sysctl;
4235 p->sysctl = NULL;
4236 unregister_sysctl_table(t->sysctl_header);
4237 kfree(t->dev_name);
4238 kfree(t);
4239}
4240
f52295a9
PE		 4241static void addrconf_sysctl_register(struct inet6_dev *idev)
4242{
408c4768
PE		 4243 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4244 NET_IPV6_NEIGH, "ipv6",
4245 &ndisc_ifinfo_sysctl_change,
4246 NULL);
c346dca1 4247 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4248 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4249}
4250
408c4768 4251static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4252{
408c4768
PE		 4253 __addrconf_sysctl_unregister(&idev->cnf);
4254 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4255}
4256
4257
4258#endif
4259
e0da5a48
PE		 4260static int addrconf_init_net(struct net *net)
4261{
4262 int err;
4263 struct ipv6_devconf *all, *dflt;
4264
4265 err = -ENOMEM;
4266 all = &ipv6_devconf;
4267 dflt = &ipv6_devconf_dflt;
4268
4269 if (net != &init_net) {
4270 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4271 if (all == NULL)
4272 goto err_alloc_all;
4273
4274 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4275 if (dflt == NULL)
4276 goto err_alloc_dflt;
4277 }
4278
4279 net->ipv6.devconf_all = all;
4280 net->ipv6.devconf_dflt = dflt;
4281
4282#ifdef CONFIG_SYSCTL
4283 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4284 NULL, all);
4285 if (err < 0)
4286 goto err_reg_all;
4287
4288 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4289 NULL, dflt);
4290 if (err < 0)
4291 goto err_reg_dflt;
4292#endif
4293 return 0;
4294
4295#ifdef CONFIG_SYSCTL
4296err_reg_dflt:
4297 __addrconf_sysctl_unregister(all);
4298err_reg_all:
4299 kfree(dflt);
4300#endif
4301err_alloc_dflt:
4302 kfree(all);
4303err_alloc_all:
4304 return err;
4305}
4306
4307static void addrconf_exit_net(struct net *net)
4308{
4309#ifdef CONFIG_SYSCTL
4310 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4311 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4312#endif
4313 if (net != &init_net) {
4314 kfree(net->ipv6.devconf_dflt);
4315 kfree(net->ipv6.devconf_all);
4316 }
4317}
4318
4319static struct pernet_operations addrconf_ops = {
4320 .init = addrconf_init_net,
4321 .exit = addrconf_exit_net,
4322};
4323
1da177e4
LT		 4324/*
4325 * Device notifier
4326 */
4327
4328int register_inet6addr_notifier(struct notifier_block *nb)
4329{
1ab1457c 4330 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4331}
4332
7159039a
YH		 4333EXPORT_SYMBOL(register_inet6addr_notifier);
4334
1da177e4
LT		 4335int unregister_inet6addr_notifier(struct notifier_block *nb)
4336{
1ab1457c 4337 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4338}
4339
7159039a
YH		 4340EXPORT_SYMBOL(unregister_inet6addr_notifier);
4341
af284937
DL		 4342
4343static int addrconf_net_init(struct net *net)
4344{
4345 return 0;
4346}
4347
4348static void addrconf_net_exit(struct net *net)
4349{
6fda7350
BT		 4350 struct net_device *dev;
4351
6fda7350
BT		 4352 rtnl_lock();
4353 /* clean dev list */
4354 for_each_netdev(net, dev) {
4355 if (__in6_dev_get(dev) == NULL)
4356 continue;
4357 addrconf_ifdown(dev, 1);
4358 }
4359 addrconf_ifdown(net->loopback_dev, 2);
4360 rtnl_unlock();
af284937
DL		 4361}
4362
4363static struct pernet_operations addrconf_net_ops = {
4364 .init = addrconf_net_init,
4365 .exit = addrconf_net_exit,
4366};
4367
1da177e4
LT		 4368/*
4369 * Init / cleanup code
4370 */
4371
4372int __init addrconf_init(void)
4373{
2a8cc6c8
YH		 4374 int err;
4375
4376 if ((err = ipv6_addr_label_init()) < 0) {
4377 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4378 err);
4379 return err;
4380 }
1da177e4 4381
e0da5a48
PE		 4382 register_pernet_subsys(&addrconf_ops);
4383
1da177e4
LT		 4384 /* The addrconf netdev notifier requires that loopback_dev
4385 * has it's ipv6 private information allocated and setup
4386 * before it can bring up and give link-local addresses
4387 * to other devices which are up.
4388 *
4389 * Unfortunately, loopback_dev is not necessarily the first
4390 * entry in the global dev_base list of net devices. In fact,
4391 * it is likely to be the very last entry on that list.
4392 * So this causes the notifier registry below to try and
4393 * give link-local addresses to all devices besides loopback_dev
4394 * first, then loopback_dev, which cases all the non-loopback_dev
4395 * devices to fail to get a link-local address.
4396 *
4397 * So, as a temporary fix, allocate the ipv6 structure for
4398 * loopback_dev first by hand.
4399 * Longer term, all of the dependencies ipv6 has upon the loopback
4400 * device and it being up should be removed.
4401 */
4402 rtnl_lock();
2774c7ab 4403 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4404 err = -ENOMEM;
4405 rtnl_unlock();
4406 if (err)
e0da5a48 4407 goto errlo;
1da177e4 4408
af284937
DL		 4409 err = register_pernet_device(&addrconf_net_ops);
4410 if (err)
4411 return err;
4412
1da177e4
LT		 4413 register_netdevice_notifier(&ipv6_dev_notf);
4414
1da177e4 4415 addrconf_verify(0);
c127ea2c
TG		 4416
4417 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4418 if (err < 0)
4419 goto errout;
4420
4421 /* Only the first call to __rtnl_register can fail */
4422 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4423 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4424 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4425 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4426 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4427
2a8cc6c8
YH		 4428 ipv6_addr_label_rtnl_register();
4429
1da177e4 4430 return 0;
c127ea2c
TG		 4431errout:
4432 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4433errlo:
4434 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4435
4436 return err;
1da177e4
LT		 4437}
4438
09f7709f 4439void addrconf_cleanup(void)
1da177e4 4440{
1ab1457c 4441 struct inet6_ifaddr *ifa;
1da177e4
LT		 4442 int i;
4443
4444 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4445 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4446
e0da5a48 4447 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4448
4449 rtnl_lock();
4450
1da177e4
LT		 4451 /*
4452 * Check hash table.
4453 */
1da177e4
LT		 4454 write_lock_bh(&addrconf_hash_lock);
4455 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4456 for (ifa=inet6_addr_lst[i]; ifa; ) {
4457 struct inet6_ifaddr *bifa;
4458
4459 bifa = ifa;
4460 ifa = ifa->lst_next;
4461 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4462 /* Do not free it; something is wrong.
4463 Now we can investigate it with debugger.
4464 */
4465 }
4466 }
4467 write_unlock_bh(&addrconf_hash_lock);
4468
4469 del_timer(&addr_chk_timer);
1da177e4 4470 rtnl_unlock();
af284937
DL		 4471
4472 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4473}
Clone of davem's net-next-2.6 tree