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[IPV6]: Use appropriate sock tclass setting for routing lookup.
[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
LT		 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
1da177e4
LT		 232static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233{
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236}
237
238enum addrconf_timer_t
239{
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243};
244
245static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248{
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263}
264
7f7d9a6b
HX		 265static int snmp6_alloc_dev(struct inet6_dev *idev)
266{
7f7d9a6b 267 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 268 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 271 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 272 goto err_icmp;
14878f75 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 274 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 275 goto err_icmpmsg;
7f7d9a6b
HX		 276
277 return 0;
278
14878f75
DS		 279err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 281err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283err_ip:
aaf70ec7 284 return -ENOMEM;
7f7d9a6b
HX		 285}
286
16910b98 287static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 288{
14878f75 289 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 292}
293
1da177e4
LT		 294/* Nobody refers to this device, we may destroy it. */
295
8814c4b5
YH		 296static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297{
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300}
301
1da177e4
LT		 302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
8814c4b5 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 317}
318
7159039a
YH		 319EXPORT_SYMBOL(in6_dev_finish_destroy);
320
1da177e4
LT		 321static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322{
323 struct inet6_dev *ndev;
d88ae4cc 324 struct in6_addr maddr;
1da177e4
LT		 325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
1ab1457c 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 332
1ab1457c
YH		 333 if (ndev == NULL)
334 return NULL;
322f74a4
IO		 335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
441fc2a2 338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
1da177e4 348
322f74a4
IO		 349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __FUNCTION__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
1da177e4 358
322f74a4
IO		 359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __FUNCTION__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
1da177e4
LT		 373
374#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 378#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380#endif
381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
322f74a4
IO		 393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
1da177e4
LT		 397#endif
398
f24e3d65 399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 400 ndev->if_flags |= IF_READY;
401
322f74a4
IO		 402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
f52295a9 404 addrconf_sysctl_register(ndev);
30c4cf57
DS		 405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
1da177e4
LT		 412 return ndev;
413}
414
415static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
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;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
1ab1457c 443
1da177e4
LT		 444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
1da177e4
LT		 452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457}
458
459
e186932b 460static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 461{
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
bff16c2f 466 for_each_netdev(net, dev) {
8814c4b5 467 rcu_read_lock();
1da177e4
LT		 468 idev = __in6_dev_get(dev);
469 if (idev) {
e186932b
PE		 470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
1da177e4
LT		 472 if (changed)
473 dev_forward_change(idev);
474 }
8814c4b5 475 rcu_read_unlock();
1da177e4
LT		 476 }
477 read_unlock(&dev_base_lock);
478}
c8fecf22
PE		 479
480static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481{
bff16c2f
PE		 482 struct net *net;
483
484 net = (struct net *)table->extra2;
441fc2a2 485 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 486 return;
487
e186932b
PE		 488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
c8fecf22
PE		 492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
496 rt6_purge_dflt_routers();
497}
1da177e4
LT		 498#endif
499
500/* Nobody refers to this ifaddr, destroy it */
501
502void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503{
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506#ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508#endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522}
523
e55ffac6
BH		 524static void
525ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526{
527 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
8a6ce0c0 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542}
543
1da177e4
LT		 544/* On success it returns ifp with increased reference count */
545
546static struct inet6_ifaddr *
547ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 548 int scope, u32 flags)
1da177e4
LT		 549{
550 struct inet6_ifaddr *ifa = NULL;
551 struct rt6_info *rt;
552 int hash;
553 int err = 0;
554
8814c4b5 555 rcu_read_lock_bh();
1da177e4
LT		 556 if (idev->dead) {
557 err = -ENODEV; /*XXX*/
558 goto out2;
559 }
560
561 write_lock(&addrconf_hash_lock);
562
563 /* Ignore adding duplicate addresses on an interface */
06bfe655 564 if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
1da177e4
LT		 565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
322f74a4 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
1da177e4
LT		 584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
57f5f544
KF		 594 ifa->rt = rt;
595
95c385b4
NH		 596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
1da177e4
LT		 606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
e55ffac6 621 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 622
623#ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629#endif
630
1da177e4
LT		 631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633out2:
8814c4b5 634 rcu_read_unlock_bh();
1da177e4 635
fd92833a 636 if (likely(err == 0))
e041c683 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647}
648
649/* This function wants to get referenced ifp and releases it before return */
650
651static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652{
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676#ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692#endif
693
1d142804 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
1d142804 702 continue;
1da177e4
LT		 703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
1d142804 726 ifap = &ifa->if_next;
1da177e4
LT		 727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
e041c683 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
754
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
e0a1ad73 760 ip6_del_rt(rt);
1da177e4
LT		 761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771}
772
773#ifdef CONFIG_IPV6_PRIVACY
774static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775{
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 779 unsigned long regen_advance;
1da177e4
LT		 780 int tmp_plen;
781 int ret = 0;
782 int max_addresses;
95c385b4 783 u32 addr_flags;
1da177e4
LT		 784
785 write_lock(&idev->lock);
786 if (ift) {
787 spin_lock_bh(&ift->lock);
788 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
789 spin_unlock_bh(&ift->lock);
790 tmpaddr = &addr;
791 } else {
792 tmpaddr = NULL;
793 }
794retry:
795 in6_dev_hold(idev);
796 if (idev->cnf.use_tempaddr <= 0) {
797 write_unlock(&idev->lock);
798 printk(KERN_INFO
799 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
800 in6_dev_put(idev);
801 ret = -1;
802 goto out;
803 }
804 spin_lock_bh(&ifp->lock);
805 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
806 idev->cnf.use_tempaddr = -1; /*XXX*/
807 spin_unlock_bh(&ifp->lock);
808 write_unlock(&idev->lock);
809 printk(KERN_WARNING
810 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
811 in6_dev_put(idev);
812 ret = -1;
813 goto out;
814 }
815 in6_ifa_hold(ifp);
816 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
817 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
818 spin_unlock_bh(&ifp->lock);
819 write_unlock(&idev->lock);
820 printk(KERN_WARNING
821 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
822 in6_ifa_put(ifp);
823 in6_dev_put(idev);
824 ret = -1;
825 goto out;
826 }
827 memcpy(&addr.s6_addr[8], idev->rndid, 8);
828 tmp_valid_lft = min_t(__u32,
829 ifp->valid_lft,
830 idev->cnf.temp_valid_lft);
1ab1457c
YH		 831 tmp_prefered_lft = min_t(__u32,
832 ifp->prefered_lft,
1da177e4
LT		 833 idev->cnf.temp_prefered_lft - desync_factor / HZ);
834 tmp_plen = ifp->prefix_len;
835 max_addresses = idev->cnf.max_addresses;
836 tmp_cstamp = ifp->cstamp;
837 tmp_tstamp = ifp->tstamp;
838 spin_unlock_bh(&ifp->lock);
839
eac55bf9
BB		 840 regen_advance = idev->cnf.regen_max_retry *
841 idev->cnf.dad_transmits *
842 idev->nd_parms->retrans_time / HZ;
1da177e4 843 write_unlock(&idev->lock);
95c385b4 844
eac55bf9
BB		 845 /* A temporary address is created only if this calculated Preferred
846 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
847 * an implementation must not create a temporary address with a zero
848 * Preferred Lifetime.
849 */
850 if (tmp_prefered_lft <= regen_advance) {
851 in6_ifa_put(ifp);
852 in6_dev_put(idev);
853 ret = -1;
854 goto out;
855 }
856
95c385b4
NH		 857 addr_flags = IFA_F_TEMPORARY;
858 /* set in addrconf_prefix_rcv() */
859 if (ifp->flags & IFA_F_OPTIMISTIC)
860 addr_flags |= IFA_F_OPTIMISTIC;
861
1da177e4 862 ift = !max_addresses ||
1ab1457c 863 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 864 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 865 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
866 addr_flags) : NULL;
1da177e4
LT		 867 if (!ift || IS_ERR(ift)) {
868 in6_ifa_put(ifp);
869 in6_dev_put(idev);
870 printk(KERN_INFO
871 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
872 tmpaddr = &addr;
873 write_lock(&idev->lock);
874 goto retry;
875 }
876
877 spin_lock_bh(&ift->lock);
878 ift->ifpub = ifp;
879 ift->valid_lft = tmp_valid_lft;
880 ift->prefered_lft = tmp_prefered_lft;
881 ift->cstamp = tmp_cstamp;
882 ift->tstamp = tmp_tstamp;
883 spin_unlock_bh(&ift->lock);
884
885 addrconf_dad_start(ift, 0);
886 in6_ifa_put(ift);
887 in6_dev_put(idev);
888out:
889 return ret;
890}
891#endif
892
893/*
072047e4 894 * Choose an appropriate source address (RFC3484)
1da177e4 895 */
072047e4
YH		 896struct ipv6_saddr_score {
897 int addr_type;
898 unsigned int attrs;
899 int matchlen;
0d27b427 900 int scope;
072047e4
YH		 901 unsigned int rule;
902};
903
904#define IPV6_SADDR_SCORE_LOCAL 0x0001
905#define IPV6_SADDR_SCORE_PREFERRED 0x0004
906#define IPV6_SADDR_SCORE_HOA 0x0008
907#define IPV6_SADDR_SCORE_OIF 0x0010
908#define IPV6_SADDR_SCORE_LABEL 0x0020
909#define IPV6_SADDR_SCORE_PRIVACY 0x0040
910
b6f99a21 911static inline int ipv6_saddr_preferred(int type)
1da177e4 912{
072047e4
YH		 913 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
914 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
915 return 1;
916 return 0;
1da177e4
LT		 917}
918
072047e4 919int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 920 struct in6_addr *daddr, struct in6_addr *saddr)
921{
072047e4
YH		 922 struct ipv6_saddr_score hiscore;
923 struct inet6_ifaddr *ifa_result = NULL;
924 int daddr_type = __ipv6_addr_type(daddr);
925 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 926 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
927 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 928 struct net_device *dev;
1da177e4 929
072047e4 930 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 931
072047e4 932 read_lock(&dev_base_lock);
8814c4b5 933 rcu_read_lock();
1da177e4 934
881d966b 935 for_each_netdev(&init_net, dev) {
072047e4
YH		 936 struct inet6_dev *idev;
937 struct inet6_ifaddr *ifa;
938
939 /* Rule 0: Candidate Source Address (section 4)
940 * - multicast and link-local destination address,
941 * the set of candidate source address MUST only
942 * include addresses assigned to interfaces
943 * belonging to the same link as the outgoing
944 * interface.
945 * (- For site-local destination addresses, the
946 * set of candidate source addresses MUST only
947 * include addresses assigned to interfaces
948 * belonging to the same site as the outgoing
949 * interface.)
950 */
951 if ((daddr_type & IPV6_ADDR_MULTICAST ||
952 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
953 daddr_dev && dev != daddr_dev)
954 continue;
1da177e4 955
1da177e4 956 idev = __in6_dev_get(dev);
072047e4
YH		 957 if (!idev)
958 continue;
959
960 read_lock_bh(&idev->lock);
961 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
962 struct ipv6_saddr_score score;
963
964 score.addr_type = __ipv6_addr_type(&ifa->addr);
965
6b3ae80a
YH		 966 /* Rule 0:
967 * - Tentative Address (RFC2462 section 5.4)
968 * - A tentative address is not considered
969 * "assigned to an interface" in the traditional
95c385b4 970 * sense, unless it is also flagged as optimistic.
6b3ae80a 971 * - Candidate Source Address (section 4)
072047e4
YH		 972 * - In any case, anycast addresses, multicast
973 * addresses, and the unspecified address MUST
974 * NOT be included in a candidate set.
975 */
95c385b4
NH		 976 if ((ifa->flags & IFA_F_TENTATIVE) &&
977 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 978 continue;
072047e4
YH		 979 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
980 score.addr_type & IPV6_ADDR_MULTICAST)) {
981 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 982 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 983 "assigned as unicast address on %s",
984 dev->name);
985 continue;
986 }
987
988 score.attrs = 0;
989 score.matchlen = 0;
990 score.scope = 0;
991 score.rule = 0;
992
993 if (ifa_result == NULL) {
994 /* record it if the first available entry */
995 goto record_it;
996 }
997
998 /* Rule 1: Prefer same address */
999 if (hiscore.rule < 1) {
1000 if (ipv6_addr_equal(&ifa_result->addr, daddr))
1001 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
1002 hiscore.rule++;
1003 }
1004 if (ipv6_addr_equal(&ifa->addr, daddr)) {
1005 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1006 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1007 score.rule = 1;
1008 goto record_it;
1da177e4 1009 }
072047e4
YH		 1010 } else {
1011 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1012 continue;
1da177e4 1013 }
1da177e4 1014
072047e4
YH		 1015 /* Rule 2: Prefer appropriate scope */
1016 if (hiscore.rule < 2) {
1017 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1018 hiscore.rule++;
1019 }
1020 score.scope = __ipv6_addr_src_scope(score.addr_type);
1021 if (hiscore.scope < score.scope) {
1022 if (hiscore.scope < daddr_scope) {
1023 score.rule = 2;
1024 goto record_it;
1025 } else
1026 continue;
1027 } else if (score.scope < hiscore.scope) {
1028 if (score.scope < daddr_scope)
e55ffac6 1029 break; /* addresses sorted by scope */
072047e4
YH		 1030 else {
1031 score.rule = 2;
1032 goto record_it;
1033 }
1034 }
1da177e4 1035
95c385b4 1036 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1037 if (hiscore.rule < 3) {
1038 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1039 (((ifa_result->flags &
1040 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1041 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1042 hiscore.rule++;
1043 }
1044 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1045 (((ifa->flags &
95c385b4 1046 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1047 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1048 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1049 score.rule = 3;
1050 goto record_it;
1051 }
1052 } else {
1053 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1054 continue;
1055 }
1da177e4 1056
3b9f9a1c 1057 /* Rule 4: Prefer home address */
59fbb3a6 1058#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1059 if (hiscore.rule < 4) {
1060 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1061 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1062 hiscore.rule++;
1063 }
1064 if (ifa->flags & IFA_F_HOMEADDRESS) {
1065 score.attrs |= IPV6_SADDR_SCORE_HOA;
1066 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1067 score.rule = 4;
1068 goto record_it;
1069 }
1070 } else {
1071 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1072 continue;
1073 }
1074#else
220bbd74
YH		 1075 if (hiscore.rule < 4)
1076 hiscore.rule++;
3b9f9a1c 1077#endif
072047e4
YH		 1078
1079 /* Rule 5: Prefer outgoing interface */
1080 if (hiscore.rule < 5) {
1081 if (daddr_dev == NULL ||
1082 daddr_dev == ifa_result->idev->dev)
1083 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1084 hiscore.rule++;
1085 }
1086 if (daddr_dev == NULL ||
1087 daddr_dev == ifa->idev->dev) {
1088 score.attrs |= IPV6_SADDR_SCORE_OIF;
1089 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1090 score.rule = 5;
1091 goto record_it;
1092 }
1093 } else {
1094 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1095 continue;
1096 }
1097
1098 /* Rule 6: Prefer matching label */
1099 if (hiscore.rule < 6) {
c1ee656c 1100 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1101 hiscore.addr_type,
1102 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1103 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1104 hiscore.rule++;
1105 }
c1ee656c 1106 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1107 score.addr_type,
1108 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1109 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1110 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1111 score.rule = 6;
1112 goto record_it;
1da177e4 1113 }
072047e4
YH		 1114 } else {
1115 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1116 continue;
1117 }
1118
44fd0261 1119#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1120 /* Rule 7: Prefer public address
1121 * Note: prefer temprary address if use_tempaddr >= 2
1122 */
1123 if (hiscore.rule < 7) {
1124 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1125 (ifa_result->idev->cnf.use_tempaddr >= 2))
1126 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1127 hiscore.rule++;
1128 }
1129 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1130 (ifa->idev->cnf.use_tempaddr >= 2)) {
1131 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1132 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1133 score.rule = 7;
1134 goto record_it;
1135 }
1136 } else {
1137 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1138 continue;
1139 }
5e2707fa
YH		 1140#else
1141 if (hiscore.rule < 7)
1142 hiscore.rule++;
44fd0261 1143#endif
072047e4 1144 /* Rule 8: Use longest matching prefix */
12da2a43 1145 if (hiscore.rule < 8) {
072047e4 1146 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1147 hiscore.rule++;
1148 }
072047e4
YH		 1149 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1150 if (score.matchlen > hiscore.matchlen) {
1151 score.rule = 8;
1152 goto record_it;
1da177e4 1153 }
072047e4
YH		 1154#if 0
1155 else if (score.matchlen < hiscore.matchlen)
1156 continue;
1157#endif
1158
1159 /* Final Rule: choose first available one */
1160 continue;
1161record_it:
1162 if (ifa_result)
1163 in6_ifa_put(ifa_result);
1164 in6_ifa_hold(ifa);
1165 ifa_result = ifa;
1166 hiscore = score;
1da177e4 1167 }
072047e4 1168 read_unlock_bh(&idev->lock);
1da177e4 1169 }
8814c4b5 1170 rcu_read_unlock();
1da177e4
LT		 1171 read_unlock(&dev_base_lock);
1172
072047e4
YH		 1173 if (!ifa_result)
1174 return -EADDRNOTAVAIL;
1ab1457c 1175
072047e4
YH		 1176 ipv6_addr_copy(saddr, &ifa_result->addr);
1177 in6_ifa_put(ifa_result);
1178 return 0;
1da177e4
LT		 1179}
1180
1181
1182int ipv6_get_saddr(struct dst_entry *dst,
1183 struct in6_addr *daddr, struct in6_addr *saddr)
1184{
7a3025b1 1185 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1186}
1187
7159039a 1188EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1189
95c385b4
NH		 1190int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1191 unsigned char banned_flags)
1da177e4
LT		 1192{
1193 struct inet6_dev *idev;
1194 int err = -EADDRNOTAVAIL;
1195
8814c4b5 1196 rcu_read_lock();
1da177e4
LT		 1197 if ((idev = __in6_dev_get(dev)) != NULL) {
1198 struct inet6_ifaddr *ifp;
1199
1200 read_lock_bh(&idev->lock);
1201 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1202 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1203 ipv6_addr_copy(addr, &ifp->addr);
1204 err = 0;
1205 break;
1206 }
1207 }
1208 read_unlock_bh(&idev->lock);
1209 }
8814c4b5 1210 rcu_read_unlock();
1da177e4
LT		 1211 return err;
1212}
1213
1214static int ipv6_count_addresses(struct inet6_dev *idev)
1215{
1216 int cnt = 0;
1217 struct inet6_ifaddr *ifp;
1218
1219 read_lock_bh(&idev->lock);
1220 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1221 cnt++;
1222 read_unlock_bh(&idev->lock);
1223 return cnt;
1224}
1225
bfeade08
DL		 1226int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1227 struct net_device *dev, int strict)
1da177e4
LT		 1228{
1229 struct inet6_ifaddr * ifp;
1230 u8 hash = ipv6_addr_hash(addr);
1231
1232 read_lock_bh(&addrconf_hash_lock);
1233 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
bfeade08
DL		 1234 if (ifp->idev->dev->nd_net != net)
1235 continue;
1da177e4
LT		 1236 if (ipv6_addr_equal(&ifp->addr, addr) &&
1237 !(ifp->flags&IFA_F_TENTATIVE)) {
1238 if (dev == NULL || ifp->idev->dev == dev ||
1239 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1240 break;
1241 }
1242 }
1243 read_unlock_bh(&addrconf_hash_lock);
1244 return ifp != NULL;
1245}
7159039a
YH		 1246EXPORT_SYMBOL(ipv6_chk_addr);
1247
1da177e4 1248static
06bfe655
DL		 1249int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1250 struct net_device *dev)
1da177e4
LT		 1251{
1252 struct inet6_ifaddr * ifp;
1253 u8 hash = ipv6_addr_hash(addr);
1254
1255 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
06bfe655
DL		 1256 if (ifp->idev->dev->nd_net != net)
1257 continue;
1da177e4
LT		 1258 if (ipv6_addr_equal(&ifp->addr, addr)) {
1259 if (dev == NULL || ifp->idev->dev == dev)
1260 break;
1261 }
1262 }
1263 return ifp != NULL;
1264}
1265
1cab3da6
DL		 1266struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1267 struct net_device *dev, int strict)
1da177e4
LT		 1268{
1269 struct inet6_ifaddr * ifp;
1270 u8 hash = ipv6_addr_hash(addr);
1271
1272 read_lock_bh(&addrconf_hash_lock);
1273 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1cab3da6
DL		 1274 if (ifp->idev->dev->nd_net != net)
1275 continue;
1da177e4
LT		 1276 if (ipv6_addr_equal(&ifp->addr, addr)) {
1277 if (dev == NULL || ifp->idev->dev == dev ||
1278 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1279 in6_ifa_hold(ifp);
1280 break;
1281 }
1282 }
1283 }
1284 read_unlock_bh(&addrconf_hash_lock);
1285
1286 return ifp;
1287}
1288
1289int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1290{
1291 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1292 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1293 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1294 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1295 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1296 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1297 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1298 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1299
1300 if (!sk2_rcv_saddr && !sk_ipv6only)
1301 return 1;
1302
1303 if (addr_type2 == IPV6_ADDR_ANY &&
1304 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1305 return 1;
1306
1307 if (addr_type == IPV6_ADDR_ANY &&
1308 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1309 return 1;
1310
1311 if (sk2_rcv_saddr6 &&
1312 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1313 return 1;
1314
1315 if (addr_type == IPV6_ADDR_MAPPED &&
1316 !sk2_ipv6only &&
1317 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1318 return 1;
1319
1320 return 0;
1321}
1322
1323/* Gets referenced address, destroys ifaddr */
1324
9f5336e2 1325static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1326{
1da177e4
LT		 1327 if (ifp->flags&IFA_F_PERMANENT) {
1328 spin_lock_bh(&ifp->lock);
1329 addrconf_del_timer(ifp);
1330 ifp->flags |= IFA_F_TENTATIVE;
1331 spin_unlock_bh(&ifp->lock);
1332 in6_ifa_put(ifp);
1333#ifdef CONFIG_IPV6_PRIVACY
1334 } else if (ifp->flags&IFA_F_TEMPORARY) {
1335 struct inet6_ifaddr *ifpub;
1336 spin_lock_bh(&ifp->lock);
1337 ifpub = ifp->ifpub;
1338 if (ifpub) {
1339 in6_ifa_hold(ifpub);
1340 spin_unlock_bh(&ifp->lock);
1341 ipv6_create_tempaddr(ifpub, ifp);
1342 in6_ifa_put(ifpub);
1343 } else {
1344 spin_unlock_bh(&ifp->lock);
1345 }
1346 ipv6_del_addr(ifp);
1347#endif
1348 } else
1349 ipv6_del_addr(ifp);
1350}
1351
3c21edbd
YH		 1352void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1353{
1354 if (net_ratelimit())
1355 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1356 addrconf_dad_stop(ifp);
1357}
1da177e4
LT		 1358
1359/* Join to solicited addr multicast group. */
1360
1361void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1362{
1363 struct in6_addr maddr;
1364
1365 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1366 return;
1367
1368 addrconf_addr_solict_mult(addr, &maddr);
1369 ipv6_dev_mc_inc(dev, &maddr);
1370}
1371
1372void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1373{
1374 struct in6_addr maddr;
1375
1376 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1377 return;
1378
1379 addrconf_addr_solict_mult(addr, &maddr);
1380 __ipv6_dev_mc_dec(idev, &maddr);
1381}
1382
20380731 1383static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1384{
1385 struct in6_addr addr;
1386 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1387 if (ipv6_addr_any(&addr))
1388 return;
1389 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1390}
1391
20380731 1392static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1393{
1394 struct in6_addr addr;
1395 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1396 if (ipv6_addr_any(&addr))
1397 return;
1398 __ipv6_dev_ac_dec(ifp->idev, &addr);
1399}
1400
073a8e0e
YH		 1401static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1402{
1403 if (dev->addr_len != ETH_ALEN)
1404 return -1;
1405 memcpy(eui, dev->dev_addr, 3);
1406 memcpy(eui + 5, dev->dev_addr + 3, 3);
1407
1408 /*
1409 * The zSeries OSA network cards can be shared among various
1410 * OS instances, but the OSA cards have only one MAC address.
1411 * This leads to duplicate address conflicts in conjunction
1412 * with IPv6 if more than one instance uses the same card.
1413 *
1414 * The driver for these cards can deliver a unique 16-bit
1415 * identifier for each instance sharing the same card. It is
1416 * placed instead of 0xFFFE in the interface identifier. The
1417 * "u" bit of the interface identifier is not inverted in this
1418 * case. Hence the resulting interface identifier has local
1419 * scope according to RFC2373.
1420 */
1421 if (dev->dev_id) {
1422 eui[3] = (dev->dev_id >> 8) & 0xFF;
1423 eui[4] = dev->dev_id & 0xFF;
1424 } else {
1425 eui[3] = 0xFF;
1426 eui[4] = 0xFE;
1427 eui[0] ^= 2;
1428 }
1429 return 0;
1430}
1431
1432static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1433{
1434 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1435 if (dev->addr_len != ARCNET_ALEN)
1436 return -1;
1437 memset(eui, 0, 7);
1438 eui[7] = *(u8*)dev->dev_addr;
1439 return 0;
1440}
1441
1442static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1443{
1444 if (dev->addr_len != INFINIBAND_ALEN)
1445 return -1;
1446 memcpy(eui, dev->dev_addr + 12, 8);
1447 eui[0] |= 2;
1448 return 0;
1449}
1450
1da177e4
LT		 1451static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1452{
1453 switch (dev->type) {
1454 case ARPHRD_ETHER:
1455 case ARPHRD_FDDI:
1456 case ARPHRD_IEEE802_TR:
073a8e0e 1457 return addrconf_ifid_eui48(eui, dev);
1da177e4 1458 case ARPHRD_ARCNET:
073a8e0e 1459 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1460 case ARPHRD_INFINIBAND:
073a8e0e 1461 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1462 case ARPHRD_SIT:
1463 if (dev->priv_flags & IFF_ISATAP)
1464 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1465 }
1466 return -1;
1467}
1468
1469static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1470{
1471 int err = -1;
1472 struct inet6_ifaddr *ifp;
1473
1474 read_lock_bh(&idev->lock);
1475 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1476 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1477 memcpy(eui, ifp->addr.s6_addr+8, 8);
1478 err = 0;
1479 break;
1480 }
1481 }
1482 read_unlock_bh(&idev->lock);
1483 return err;
1484}
1485
1486#ifdef CONFIG_IPV6_PRIVACY
1487/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1488static int __ipv6_regen_rndid(struct inet6_dev *idev)
1489{
1da177e4 1490regen:
955189ef 1491 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1492 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1493
1494 /*
1495 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1496 * check if generated address is not inappropriate
1497 *
1498 * - Reserved subnet anycast (RFC 2526)
1499 * 11111101 11....11 1xxxxxxx
c7dc89c0 1500 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1501 * 00-00-5E-FE-xx-xx-xx-xx
1502 * - value 0
1503 * - XXX: already assigned to an address on the device
1504 */
1ab1457c 1505 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1506 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1507 (idev->rndid[7]&0x80))
1508 goto regen;
1509 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1510 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1511 goto regen;
1512 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1513 goto regen;
1514 }
1515
1516 return 0;
1517}
1518
1519static void ipv6_regen_rndid(unsigned long data)
1520{
1521 struct inet6_dev *idev = (struct inet6_dev *) data;
1522 unsigned long expires;
1523
8814c4b5 1524 rcu_read_lock_bh();
1da177e4
LT		 1525 write_lock_bh(&idev->lock);
1526
1527 if (idev->dead)
1528 goto out;
1529
1530 if (__ipv6_regen_rndid(idev) < 0)
1531 goto out;
1ab1457c 1532
1da177e4 1533 expires = jiffies +
1ab1457c 1534 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1535 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1536 if (time_before(expires, jiffies)) {
1537 printk(KERN_WARNING
1538 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1539 idev->dev->name);
1540 goto out;
1541 }
1542
1543 if (!mod_timer(&idev->regen_timer, expires))
1544 in6_dev_hold(idev);
1545
1546out:
1547 write_unlock_bh(&idev->lock);
8814c4b5 1548 rcu_read_unlock_bh();
1da177e4
LT		 1549 in6_dev_put(idev);
1550}
1551
1552static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1553 int ret = 0;
1554
1555 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1556 ret = __ipv6_regen_rndid(idev);
1557 return ret;
1558}
1559#endif
1560
1561/*
1562 * Add prefix route.
1563 */
1564
1565static void
1566addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1567 unsigned long expires, u32 flags)
1da177e4 1568{
86872cb5
TG		 1569 struct fib6_config cfg = {
1570 .fc_table = RT6_TABLE_PREFIX,
1571 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1572 .fc_ifindex = dev->ifindex,
1573 .fc_expires = expires,
1574 .fc_dst_len = plen,
1575 .fc_flags = RTF_UP | flags,
f1243c2d 1576 .fc_nlinfo.nl_net = &init_net,
86872cb5 1577 };
1da177e4 1578
86872cb5 1579 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1580
1581 /* Prevent useless cloning on PtP SIT.
1582 This thing is done here expecting that the whole
1583 class of non-broadcast devices need not cloning.
1584 */
0be669bb 1585#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1586 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1587 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1588#endif
1da177e4 1589
86872cb5 1590 ip6_route_add(&cfg);
1da177e4
LT		 1591}
1592
1593/* Create "default" multicast route to the interface */
1594
1595static void addrconf_add_mroute(struct net_device *dev)
1596{
86872cb5
TG		 1597 struct fib6_config cfg = {
1598 .fc_table = RT6_TABLE_LOCAL,
1599 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1600 .fc_ifindex = dev->ifindex,
1601 .fc_dst_len = 8,
1602 .fc_flags = RTF_UP,
f1243c2d 1603 .fc_nlinfo.nl_net = &init_net,
86872cb5
TG		 1604 };
1605
1606 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1607
1608 ip6_route_add(&cfg);
1da177e4
LT		 1609}
1610
0be669bb 1611#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1612static void sit_route_add(struct net_device *dev)
1613{
86872cb5
TG		 1614 struct fib6_config cfg = {
1615 .fc_table = RT6_TABLE_MAIN,
1616 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1617 .fc_ifindex = dev->ifindex,
1618 .fc_dst_len = 96,
1619 .fc_flags = RTF_UP | RTF_NONEXTHOP,
f1243c2d 1620 .fc_nlinfo.nl_net = &init_net,
86872cb5 1621 };
1da177e4
LT		 1622
1623 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1624 ip6_route_add(&cfg);
1da177e4 1625}
0be669bb 1626#endif
1da177e4
LT		 1627
1628static void addrconf_add_lroute(struct net_device *dev)
1629{
1630 struct in6_addr addr;
1631
1632 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1633 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1634}
1635
1636static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1637{
1638 struct inet6_dev *idev;
1639
1640 ASSERT_RTNL();
1641
1642 if ((idev = ipv6_find_idev(dev)) == NULL)
1643 return NULL;
1644
1645 /* Add default multicast route */
1646 addrconf_add_mroute(dev);
1647
1648 /* Add link local route */
1649 addrconf_add_lroute(dev);
1650 return idev;
1651}
1652
1653void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1654{
1655 struct prefix_info *pinfo;
1656 __u32 valid_lft;
1657 __u32 prefered_lft;
1658 int addr_type;
1659 unsigned long rt_expires;
1660 struct inet6_dev *in6_dev;
1661
1662 pinfo = (struct prefix_info *) opt;
1ab1457c 1663
1da177e4
LT		 1664 if (len < sizeof(struct prefix_info)) {
1665 ADBG(("addrconf: prefix option too short\n"));
1666 return;
1667 }
1ab1457c 1668
1da177e4
LT		 1669 /*
1670 * Validation checks ([ADDRCONF], page 19)
1671 */
1672
1673 addr_type = ipv6_addr_type(&pinfo->prefix);
1674
1675 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1676 return;
1677
1678 valid_lft = ntohl(pinfo->valid);
1679 prefered_lft = ntohl(pinfo->prefered);
1680
1681 if (prefered_lft > valid_lft) {
1682 if (net_ratelimit())
1683 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1684 return;
1685 }
1686
1687 in6_dev = in6_dev_get(dev);
1688
1689 if (in6_dev == NULL) {
1690 if (net_ratelimit())
1691 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1692 return;
1693 }
1694
1695 /*
1696 * Two things going on here:
1697 * 1) Add routes for on-link prefixes
1698 * 2) Configure prefixes with the auto flag set
1699 */
1700
1701 /* Avoid arithmetic overflow. Really, we could
1702 save rt_expires in seconds, likely valid_lft,
1703 but it would require division in fib gc, that it
1704 not good.
1705 */
1706 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1707 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1708 else
3dd4bc68
YH		 1709 rt_expires = valid_lft * HZ;
1710
1711 /*
1712 * We convert this (in jiffies) to clock_t later.
1713 * Avoid arithmetic overflow there as well.
1714 * Overflow can happen only if HZ < USER_HZ.
1715 */
1716 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1717 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1718
1719 if (pinfo->onlink) {
1720 struct rt6_info *rt;
1721 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1722
1723 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1724 if (rt->rt6i_flags&RTF_EXPIRES) {
1725 if (valid_lft == 0) {
e0a1ad73 1726 ip6_del_rt(rt);
1da177e4
LT		 1727 rt = NULL;
1728 } else {
3dd4bc68 1729 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1730 }
1731 }
1732 } else if (valid_lft) {
1733 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1734 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1735 }
1736 if (rt)
1737 dst_release(&rt->u.dst);
1738 }
1739
1740 /* Try to figure out our local address for this prefix */
1741
1742 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1743 struct inet6_ifaddr * ifp;
1744 struct in6_addr addr;
1745 int create = 0, update_lft = 0;
1746
1747 if (pinfo->prefix_len == 64) {
1748 memcpy(&addr, &pinfo->prefix, 8);
1749 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1750 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1751 in6_dev_put(in6_dev);
1752 return;
1753 }
1754 goto ok;
1755 }
1756 if (net_ratelimit())
1757 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1758 pinfo->prefix_len);
1759 in6_dev_put(in6_dev);
1760 return;
1761
1762ok:
1763
1cab3da6 1764 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1da177e4
LT		 1765
1766 if (ifp == NULL && valid_lft) {
1767 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1768 u32 addr_flags = 0;
1769
1770#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1771 if (in6_dev->cnf.optimistic_dad &&
1772 !ipv6_devconf.forwarding)
1773 addr_flags = IFA_F_OPTIMISTIC;
1774#endif
1da177e4
LT		 1775
1776 /* Do not allow to create too much of autoconfigured
1777 * addresses; this would be too easy way to crash kernel.
1778 */
1779 if (!max_addresses ||
1780 ipv6_count_addresses(in6_dev) < max_addresses)
1781 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1782 addr_type&IPV6_ADDR_SCOPE_MASK,
1783 addr_flags);
1da177e4
LT		 1784
1785 if (!ifp || IS_ERR(ifp)) {
1786 in6_dev_put(in6_dev);
1787 return;
1788 }
1789
1790 update_lft = create = 1;
1791 ifp->cstamp = jiffies;
1792 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1793 }
1794
1795 if (ifp) {
1796 int flags;
1797 unsigned long now;
1798#ifdef CONFIG_IPV6_PRIVACY
1799 struct inet6_ifaddr *ift;
1800#endif
1801 u32 stored_lft;
1802
1803 /* update lifetime (RFC2462 5.5.3 e) */
1804 spin_lock(&ifp->lock);
1805 now = jiffies;
1806 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1807 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1808 else
1809 stored_lft = 0;
1810 if (!update_lft && stored_lft) {
1811 if (valid_lft > MIN_VALID_LIFETIME ||
1812 valid_lft > stored_lft)
1813 update_lft = 1;
1814 else if (stored_lft <= MIN_VALID_LIFETIME) {
1815 /* valid_lft <= stored_lft is always true */
1816 /* XXX: IPsec */
1817 update_lft = 0;
1818 } else {
1819 valid_lft = MIN_VALID_LIFETIME;
1820 if (valid_lft < prefered_lft)
1821 prefered_lft = valid_lft;
1822 update_lft = 1;
1823 }
1824 }
1825
1826 if (update_lft) {
1827 ifp->valid_lft = valid_lft;
1828 ifp->prefered_lft = prefered_lft;
1829 ifp->tstamp = now;
1830 flags = ifp->flags;
1831 ifp->flags &= ~IFA_F_DEPRECATED;
1832 spin_unlock(&ifp->lock);
1833
1834 if (!(flags&IFA_F_TENTATIVE))
1835 ipv6_ifa_notify(0, ifp);
1836 } else
1837 spin_unlock(&ifp->lock);
1838
1839#ifdef CONFIG_IPV6_PRIVACY
1840 read_lock_bh(&in6_dev->lock);
1841 /* update all temporary addresses in the list */
1842 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1843 /*
1844 * When adjusting the lifetimes of an existing
1845 * temporary address, only lower the lifetimes.
1846 * Implementations must not increase the
1847 * lifetimes of an existing temporary address
1848 * when processing a Prefix Information Option.
1849 */
c6fbfac2
BB		 1850 if (ifp != ift->ifpub)
1851 continue;
1852
1da177e4
LT		 1853 spin_lock(&ift->lock);
1854 flags = ift->flags;
1855 if (ift->valid_lft > valid_lft &&
1856 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1857 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1858 if (ift->prefered_lft > prefered_lft &&
1859 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1860 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1861 spin_unlock(&ift->lock);
1862 if (!(flags&IFA_F_TENTATIVE))
1863 ipv6_ifa_notify(0, ift);
1864 }
1865
1866 if (create && in6_dev->cnf.use_tempaddr > 0) {
1867 /*
1868 * When a new public address is created as described in [ADDRCONF],
1869 * also create a new temporary address.
1870 */
1ab1457c 1871 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1872 ipv6_create_tempaddr(ifp, NULL);
1873 } else {
1874 read_unlock_bh(&in6_dev->lock);
1875 }
1876#endif
1877 in6_ifa_put(ifp);
1878 addrconf_verify(0);
1879 }
1880 }
1881 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1882 in6_dev_put(in6_dev);
1883}
1884
1885/*
1886 * Set destination address.
1887 * Special case for SIT interfaces where we create a new "virtual"
1888 * device.
1889 */
1890int addrconf_set_dstaddr(void __user *arg)
1891{
1892 struct in6_ifreq ireq;
1893 struct net_device *dev;
1894 int err = -EINVAL;
1895
1896 rtnl_lock();
1897
1898 err = -EFAULT;
1899 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1900 goto err_exit;
1901
881d966b 1902 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1903
1904 err = -ENODEV;
1905 if (dev == NULL)
1906 goto err_exit;
1907
0be669bb 1908#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1909 if (dev->type == ARPHRD_SIT) {
1910 struct ifreq ifr;
1911 mm_segment_t oldfs;
1912 struct ip_tunnel_parm p;
1913
1914 err = -EADDRNOTAVAIL;
1915 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1916 goto err_exit;
1917
1918 memset(&p, 0, sizeof(p));
1919 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1920 p.iph.saddr = 0;
1921 p.iph.version = 4;
1922 p.iph.ihl = 5;
1923 p.iph.protocol = IPPROTO_IPV6;
1924 p.iph.ttl = 64;
d20b3109 1925 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1926
1927 oldfs = get_fs(); set_fs(KERNEL_DS);
1928 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1929 set_fs(oldfs);
1930
1931 if (err == 0) {
1932 err = -ENOBUFS;
881d966b 1933 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1934 goto err_exit;
1935 err = dev_open(dev);
1936 }
1937 }
0be669bb 1938#endif
1da177e4
LT		 1939
1940err_exit:
1941 rtnl_unlock();
1942 return err;
1943}
1944
1945/*
1946 * Manual configuration of address on an interface
1947 */
0778769d 1948static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1949 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1950{
1951 struct inet6_ifaddr *ifp;
1952 struct inet6_dev *idev;
1953 struct net_device *dev;
1954 int scope;
46d48046 1955 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1956
1957 ASSERT_RTNL();
1ab1457c 1958
0778769d
NT		 1959 /* check the lifetime */
1960 if (!valid_lft || prefered_lft > valid_lft)
1961 return -EINVAL;
1962
881d966b 1963 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1964 return -ENODEV;
1ab1457c 1965
1da177e4
LT		 1966 if ((idev = addrconf_add_dev(dev)) == NULL)
1967 return -ENOBUFS;
1968
1969 scope = ipv6_addr_scope(pfx);
1970
46d48046 1971 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1972 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1973 flags = 0;
1974 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1975 valid_lft = 0x7FFFFFFF/HZ;
1976
1977 if (prefered_lft == 0)
1978 ifa_flags |= IFA_F_DEPRECATED;
1979 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1980 (prefered_lft != INFINITY_LIFE_TIME))
1981 prefered_lft = 0x7FFFFFFF/HZ;
1982
1983 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1984
1da177e4 1985 if (!IS_ERR(ifp)) {
06aebfb7 1986 spin_lock_bh(&ifp->lock);
0778769d
NT		 1987 ifp->valid_lft = valid_lft;
1988 ifp->prefered_lft = prefered_lft;
1989 ifp->tstamp = jiffies;
06aebfb7 1990 spin_unlock_bh(&ifp->lock);
0778769d 1991
46d48046
YH		 1992 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1993 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1994 /*
1995 * Note that section 3.1 of RFC 4429 indicates
1996 * that the Optimistic flag should not be set for
1997 * manually configured addresses
1998 */
1da177e4
LT		 1999 addrconf_dad_start(ifp, 0);
2000 in6_ifa_put(ifp);
0778769d 2001 addrconf_verify(0);
1da177e4
LT		 2002 return 0;
2003 }
2004
2005 return PTR_ERR(ifp);
2006}
2007
2008static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
2009{
2010 struct inet6_ifaddr *ifp;
2011 struct inet6_dev *idev;
2012 struct net_device *dev;
1ab1457c 2013
881d966b 2014 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 2015 return -ENODEV;
2016
2017 if ((idev = __in6_dev_get(dev)) == NULL)
2018 return -ENXIO;
2019
2020 read_lock_bh(&idev->lock);
2021 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2022 if (ifp->prefix_len == plen &&
2023 ipv6_addr_equal(pfx, &ifp->addr)) {
2024 in6_ifa_hold(ifp);
2025 read_unlock_bh(&idev->lock);
1ab1457c 2026
1da177e4
LT		 2027 ipv6_del_addr(ifp);
2028
2029 /* If the last address is deleted administratively,
2030 disable IPv6 on this interface.
2031 */
2032 if (idev->addr_list == NULL)
2033 addrconf_ifdown(idev->dev, 1);
2034 return 0;
2035 }
2036 }
2037 read_unlock_bh(&idev->lock);
2038 return -EADDRNOTAVAIL;
2039}
2040
2041
2042int addrconf_add_ifaddr(void __user *arg)
2043{
2044 struct in6_ifreq ireq;
2045 int err;
1ab1457c 2046
1da177e4
LT		 2047 if (!capable(CAP_NET_ADMIN))
2048 return -EPERM;
1ab1457c 2049
1da177e4
LT		 2050 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2051 return -EFAULT;
2052
2053 rtnl_lock();
0778769d 2054 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2055 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2056 rtnl_unlock();
2057 return err;
2058}
2059
2060int addrconf_del_ifaddr(void __user *arg)
2061{
2062 struct in6_ifreq ireq;
2063 int err;
1ab1457c 2064
1da177e4
LT		 2065 if (!capable(CAP_NET_ADMIN))
2066 return -EPERM;
2067
2068 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2069 return -EFAULT;
2070
2071 rtnl_lock();
2072 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2073 rtnl_unlock();
2074 return err;
2075}
2076
0be669bb 2077#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2078static void sit_add_v4_addrs(struct inet6_dev *idev)
2079{
2080 struct inet6_ifaddr * ifp;
2081 struct in6_addr addr;
2082 struct net_device *dev;
2083 int scope;
2084
2085 ASSERT_RTNL();
2086
2087 memset(&addr, 0, sizeof(struct in6_addr));
2088 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2089
2090 if (idev->dev->flags&IFF_POINTOPOINT) {
2091 addr.s6_addr32[0] = htonl(0xfe800000);
2092 scope = IFA_LINK;
2093 } else {
2094 scope = IPV6_ADDR_COMPATv4;
2095 }
2096
2097 if (addr.s6_addr32[3]) {
2098 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2099 if (!IS_ERR(ifp)) {
2100 spin_lock_bh(&ifp->lock);
2101 ifp->flags &= ~IFA_F_TENTATIVE;
2102 spin_unlock_bh(&ifp->lock);
2103 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2104 in6_ifa_put(ifp);
2105 }
2106 return;
2107 }
2108
881d966b 2109 for_each_netdev(&init_net, dev) {
e5ed6399 2110 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2111 if (in_dev && (dev->flags & IFF_UP)) {
2112 struct in_ifaddr * ifa;
2113
2114 int flag = scope;
2115
2116 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2117 int plen;
2118
2119 addr.s6_addr32[3] = ifa->ifa_local;
2120
2121 if (ifa->ifa_scope == RT_SCOPE_LINK)
2122 continue;
2123 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2124 if (idev->dev->flags&IFF_POINTOPOINT)
2125 continue;
2126 flag |= IFA_HOST;
2127 }
2128 if (idev->dev->flags&IFF_POINTOPOINT)
2129 plen = 64;
2130 else
2131 plen = 96;
2132
2133 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2134 IFA_F_PERMANENT);
2135 if (!IS_ERR(ifp)) {
2136 spin_lock_bh(&ifp->lock);
2137 ifp->flags &= ~IFA_F_TENTATIVE;
2138 spin_unlock_bh(&ifp->lock);
2139 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2140 in6_ifa_put(ifp);
2141 }
2142 }
2143 }
1ab1457c 2144 }
1da177e4 2145}
0be669bb 2146#endif
1da177e4
LT		 2147
2148static void init_loopback(struct net_device *dev)
2149{
2150 struct inet6_dev *idev;
2151 struct inet6_ifaddr * ifp;
2152
2153 /* ::1 */
2154
2155 ASSERT_RTNL();
2156
2157 if ((idev = ipv6_find_idev(dev)) == NULL) {
2158 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2159 return;
2160 }
2161
2162 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2163 if (!IS_ERR(ifp)) {
2164 spin_lock_bh(&ifp->lock);
2165 ifp->flags &= ~IFA_F_TENTATIVE;
2166 spin_unlock_bh(&ifp->lock);
2167 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2168 in6_ifa_put(ifp);
2169 }
2170}
2171
2172static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2173{
2174 struct inet6_ifaddr * ifp;
95c385b4
NH		 2175 u32 addr_flags = IFA_F_PERMANENT;
2176
2177#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2178 if (idev->cnf.optimistic_dad &&
2179 !ipv6_devconf.forwarding)
2180 addr_flags |= IFA_F_OPTIMISTIC;
2181#endif
1da177e4 2182
95c385b4
NH		 2183
2184 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2185 if (!IS_ERR(ifp)) {
46d48046 2186 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2187 addrconf_dad_start(ifp, 0);
2188 in6_ifa_put(ifp);
2189 }
2190}
2191
2192static void addrconf_dev_config(struct net_device *dev)
2193{
2194 struct in6_addr addr;
2195 struct inet6_dev * idev;
2196
2197 ASSERT_RTNL();
2198
74235a25
HX		 2199 if ((dev->type != ARPHRD_ETHER) &&
2200 (dev->type != ARPHRD_FDDI) &&
2201 (dev->type != ARPHRD_IEEE802_TR) &&
2202 (dev->type != ARPHRD_ARCNET) &&
2203 (dev->type != ARPHRD_INFINIBAND)) {
2204 /* Alas, we support only Ethernet autoconfiguration. */
2205 return;
2206 }
2207
1da177e4
LT		 2208 idev = addrconf_add_dev(dev);
2209 if (idev == NULL)
2210 return;
2211
2212 memset(&addr, 0, sizeof(struct in6_addr));
2213 addr.s6_addr32[0] = htonl(0xFE800000);
2214
2215 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2216 addrconf_add_linklocal(idev, &addr);
2217}
2218
0be669bb 2219#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2220static void addrconf_sit_config(struct net_device *dev)
2221{
2222 struct inet6_dev *idev;
2223
2224 ASSERT_RTNL();
2225
1ab1457c
YH		 2226 /*
2227 * Configure the tunnel with one of our IPv4
2228 * addresses... we should configure all of
1da177e4
LT		 2229 * our v4 addrs in the tunnel
2230 */
2231
2232 if ((idev = ipv6_find_idev(dev)) == NULL) {
2233 printk(KERN_DEBUG "init sit: add_dev failed\n");
2234 return;
2235 }
2236
c7dc89c0
FT		 2237 if (dev->priv_flags & IFF_ISATAP) {
2238 struct in6_addr addr;
2239
2240 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2241 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2242 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2243 addrconf_add_linklocal(idev, &addr);
2244 return;
2245 }
2246
1da177e4
LT		 2247 sit_add_v4_addrs(idev);
2248
2249 if (dev->flags&IFF_POINTOPOINT) {
2250 addrconf_add_mroute(dev);
2251 addrconf_add_lroute(dev);
2252 } else
2253 sit_route_add(dev);
2254}
0be669bb 2255#endif
1da177e4
LT		 2256
2257static inline int
2258ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2259{
2260 struct in6_addr lladdr;
2261
95c385b4 2262 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2263 addrconf_add_linklocal(idev, &lladdr);
2264 return 0;
2265 }
2266 return -1;
2267}
2268
2269static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2270{
2271 struct net_device *link_dev;
2272
2273 /* first try to inherit the link-local address from the link device */
2274 if (idev->dev->iflink &&
881d966b 2275 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2276 if (!ipv6_inherit_linklocal(idev, link_dev))
2277 return;
2278 }
2279 /* then try to inherit it from any device */
881d966b 2280 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2281 if (!ipv6_inherit_linklocal(idev, link_dev))
2282 return;
2283 }
2284 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2285}
2286
2287/*
2288 * Autoconfigure tunnel with a link-local address so routing protocols,
2289 * DHCPv6, MLD etc. can be run over the virtual link
2290 */
2291
2292static void addrconf_ip6_tnl_config(struct net_device *dev)
2293{
2294 struct inet6_dev *idev;
2295
2296 ASSERT_RTNL();
2297
2298 if ((idev = addrconf_add_dev(dev)) == NULL) {
2299 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2300 return;
2301 }
2302 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2303}
2304
1ab1457c 2305static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2306 void * data)
2307{
2308 struct net_device *dev = (struct net_device *) data;
74235a25 2309 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2310 int run_pending = 0;
b217d616 2311 int err;
1da177e4 2312
e9dc8653
EB		 2313 if (dev->nd_net != &init_net)
2314 return NOTIFY_DONE;
2315
1da177e4 2316 switch(event) {
45ba9dd2 2317 case NETDEV_REGISTER:
74235a25 2318 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2319 idev = ipv6_add_dev(dev);
2320 if (!idev)
b217d616 2321 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2322 }
2323 break;
1da177e4 2324 case NETDEV_UP:
3c21edbd 2325 case NETDEV_CHANGE:
c2edacf8
JV		 2326 if (dev->flags & IFF_SLAVE)
2327 break;
2328
3c21edbd 2329 if (event == NETDEV_UP) {
f24e3d65 2330 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2331 /* device is not ready yet. */
2332 printk(KERN_INFO
2333 "ADDRCONF(NETDEV_UP): %s: "
2334 "link is not ready\n",
2335 dev->name);
2336 break;
2337 }
99081049 2338
d31c7b8f
EP		 2339 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2340 idev = ipv6_add_dev(dev);
2341
99081049
KS		 2342 if (idev)
2343 idev->if_flags |= IF_READY;
3c21edbd 2344 } else {
f24e3d65 2345 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2346 /* device is still not ready. */
2347 break;
2348 }
2349
2350 if (idev) {
2351 if (idev->if_flags & IF_READY) {
2352 /* device is already configured. */
2353 break;
2354 }
2355 idev->if_flags |= IF_READY;
2356 }
2357
2358 printk(KERN_INFO
2359 "ADDRCONF(NETDEV_CHANGE): %s: "
2360 "link becomes ready\n",
2361 dev->name);
2362
c5e33bdd 2363 run_pending = 1;
3c21edbd
YH		 2364 }
2365
1da177e4 2366 switch(dev->type) {
0be669bb 2367#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2368 case ARPHRD_SIT:
2369 addrconf_sit_config(dev);
2370 break;
0be669bb 2371#endif
1da177e4
LT		 2372 case ARPHRD_TUNNEL6:
2373 addrconf_ip6_tnl_config(dev);
2374 break;
2375 case ARPHRD_LOOPBACK:
2376 init_loopback(dev);
2377 break;
2378
2379 default:
2380 addrconf_dev_config(dev);
2381 break;
3ff50b79 2382 }
1da177e4 2383 if (idev) {
c5e33bdd
YH		 2384 if (run_pending)
2385 addrconf_dad_run(idev);
2386
1da177e4
LT		 2387 /* If the MTU changed during the interface down, when the
2388 interface up, the changed MTU must be reflected in the
2389 idev as well as routers.
2390 */
2391 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2392 rt6_mtu_change(dev, dev->mtu);
2393 idev->cnf.mtu6 = dev->mtu;
2394 }
2395 idev->tstamp = jiffies;
2396 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2397 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2398 stop IPv6 on this interface.
2399 */
2400 if (dev->mtu < IPV6_MIN_MTU)
2401 addrconf_ifdown(dev, event != NETDEV_DOWN);
2402 }
2403 break;
2404
2405 case NETDEV_CHANGEMTU:
d31c7b8f 2406 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2407 rt6_mtu_change(dev, dev->mtu);
2408 idev->cnf.mtu6 = dev->mtu;
2409 break;
2410 }
2411
d31c7b8f
EP		 2412 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2413 idev = ipv6_add_dev(dev);
2414 if (idev)
2415 break;
2416 }
2417
1da177e4
LT		 2418 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2419
2420 case NETDEV_DOWN:
2421 case NETDEV_UNREGISTER:
2422 /*
2423 * Remove all addresses from this interface.
2424 */
2425 addrconf_ifdown(dev, event != NETDEV_DOWN);
2426 break;
3c21edbd 2427
1da177e4 2428 case NETDEV_CHANGENAME:
1da177e4 2429 if (idev) {
5632c515 2430 snmp6_unregister_dev(idev);
408c4768 2431 addrconf_sysctl_unregister(idev);
f52295a9 2432 addrconf_sysctl_register(idev);
b217d616
HX		 2433 err = snmp6_register_dev(idev);
2434 if (err)
2435 return notifier_from_errno(err);
5632c515 2436 }
1da177e4 2437 break;
3ff50b79 2438 }
1da177e4
LT		 2439
2440 return NOTIFY_OK;
2441}
2442
2443/*
2444 * addrconf module should be notified of a device going up
2445 */
2446static struct notifier_block ipv6_dev_notf = {
2447 .notifier_call = addrconf_notify,
2448 .priority = 0
2449};
2450
2451static int addrconf_ifdown(struct net_device *dev, int how)
2452{
2453 struct inet6_dev *idev;
2454 struct inet6_ifaddr *ifa, **bifa;
2455 int i;
2456
2457 ASSERT_RTNL();
2458
eb867579 2459 if ((dev->flags & IFF_LOOPBACK) && how == 1)
1da177e4
LT		 2460 how = 0;
2461
2462 rt6_ifdown(dev);
2463 neigh_ifdown(&nd_tbl, dev);
2464
2465 idev = __in6_dev_get(dev);
2466 if (idev == NULL)
2467 return -ENODEV;
2468
2469 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2470 Do not dev_put!
1da177e4 2471 */
439e2385 2472 if (how) {
1da177e4 2473 idev->dead = 1;
8814c4b5
YH		 2474
2475 /* protected by rtnl_lock */
2476 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2477
2478 /* Step 1.5: remove snmp6 entry */
2479 snmp6_unregister_dev(idev);
2480
2481 }
2482
2483 /* Step 2: clear hash table */
2484 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2485 bifa = &inet6_addr_lst[i];
2486
2487 write_lock_bh(&addrconf_hash_lock);
2488 while ((ifa = *bifa) != NULL) {
2489 if (ifa->idev == idev) {
2490 *bifa = ifa->lst_next;
2491 ifa->lst_next = NULL;
2492 addrconf_del_timer(ifa);
2493 in6_ifa_put(ifa);
2494 continue;
2495 }
2496 bifa = &ifa->lst_next;
2497 }
2498 write_unlock_bh(&addrconf_hash_lock);
2499 }
2500
2501 write_lock_bh(&idev->lock);
2502
2503 /* Step 3: clear flags for stateless addrconf */
439e2385 2504 if (!how)
3c21edbd 2505 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2506
2507 /* Step 4: clear address list */
2508#ifdef CONFIG_IPV6_PRIVACY
439e2385 2509 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2510 in6_dev_put(idev);
2511
2512 /* clear tempaddr list */
2513 while ((ifa = idev->tempaddr_list) != NULL) {
2514 idev->tempaddr_list = ifa->tmp_next;
2515 ifa->tmp_next = NULL;
2516 ifa->dead = 1;
2517 write_unlock_bh(&idev->lock);
2518 spin_lock_bh(&ifa->lock);
2519
2520 if (ifa->ifpub) {
2521 in6_ifa_put(ifa->ifpub);
2522 ifa->ifpub = NULL;
2523 }
2524 spin_unlock_bh(&ifa->lock);
2525 in6_ifa_put(ifa);
2526 write_lock_bh(&idev->lock);
2527 }
2528#endif
2529 while ((ifa = idev->addr_list) != NULL) {
2530 idev->addr_list = ifa->if_next;
2531 ifa->if_next = NULL;
2532 ifa->dead = 1;
2533 addrconf_del_timer(ifa);
2534 write_unlock_bh(&idev->lock);
2535
2536 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2537 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2538 in6_ifa_put(ifa);
2539
2540 write_lock_bh(&idev->lock);
2541 }
2542 write_unlock_bh(&idev->lock);
2543
2544 /* Step 5: Discard multicast list */
2545
439e2385 2546 if (how)
1da177e4
LT		 2547 ipv6_mc_destroy_dev(idev);
2548 else
2549 ipv6_mc_down(idev);
2550
1da177e4 2551 idev->tstamp = jiffies;
1ab1457c 2552
1da177e4
LT		 2553 /* Shot the device (if unregistered) */
2554
439e2385 2555 if (how) {
408c4768 2556 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2557 neigh_parms_release(&nd_tbl, idev->nd_parms);
2558 neigh_ifdown(&nd_tbl, dev);
2559 in6_dev_put(idev);
2560 }
2561 return 0;
2562}
2563
2564static void addrconf_rs_timer(unsigned long data)
2565{
2566 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2567
2568 if (ifp->idev->cnf.forwarding)
2569 goto out;
2570
2571 if (ifp->idev->if_flags & IF_RA_RCVD) {
2572 /*
2573 * Announcement received after solicitation
2574 * was sent
2575 */
2576 goto out;
2577 }
2578
2579 spin_lock(&ifp->lock);
2580 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2581 struct in6_addr all_routers;
2582
2583 /* The wait after the last probe can be shorter */
2584 addrconf_mod_timer(ifp, AC_RS,
2585 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2586 ifp->idev->cnf.rtr_solicit_delay :
2587 ifp->idev->cnf.rtr_solicit_interval);
2588 spin_unlock(&ifp->lock);
2589
2590 ipv6_addr_all_routers(&all_routers);
2591
2592 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2593 } else {
2594 spin_unlock(&ifp->lock);
2595 /*
2596 * Note: we do not support deprecated "all on-link"
2597 * assumption any longer.
2598 */
2599 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2600 ifp->idev->dev->name);
2601 }
2602
2603out:
2604 in6_ifa_put(ifp);
2605}
2606
2607/*
2608 * Duplicate Address Detection
2609 */
3c21edbd
YH		 2610static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2611{
2612 unsigned long rand_num;
2613 struct inet6_dev *idev = ifp->idev;
2614
95c385b4
NH		 2615 if (ifp->flags & IFA_F_OPTIMISTIC)
2616 rand_num = 0;
2617 else
2618 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2619
3c21edbd
YH		 2620 ifp->probes = idev->cnf.dad_transmits;
2621 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2622}
2623
e431b8c0 2624static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2625{
2626 struct inet6_dev *idev = ifp->idev;
2627 struct net_device *dev = idev->dev;
1da177e4
LT		 2628
2629 addrconf_join_solict(dev, &ifp->addr);
2630
1da177e4 2631 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2632
2633 read_lock_bh(&idev->lock);
2634 if (ifp->dead)
2635 goto out;
2636 spin_lock_bh(&ifp->lock);
2637
2638 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2639 !(ifp->flags&IFA_F_TENTATIVE) ||
2640 ifp->flags & IFA_F_NODAD) {
95c385b4 2641 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2642 spin_unlock_bh(&ifp->lock);
2643 read_unlock_bh(&idev->lock);
2644
2645 addrconf_dad_completed(ifp);
2646 return;
2647 }
2648
6732bade 2649 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2650 spin_unlock_bh(&ifp->lock);
6732bade 2651 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2652 /*
2653 * If the defice is not ready:
2654 * - keep it tentative if it is a permanent address.
2655 * - otherwise, kill it.
2656 */
2657 in6_ifa_hold(ifp);
2658 addrconf_dad_stop(ifp);
6732bade 2659 return;
3c21edbd 2660 }
95c385b4
NH		 2661
2662 /*
2663 * Optimistic nodes can start receiving
2664 * Frames right away
2665 */
2666 if(ifp->flags & IFA_F_OPTIMISTIC)
2667 ip6_ins_rt(ifp->rt);
2668
6732bade
YH		 2669 addrconf_dad_kick(ifp);
2670 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2671out:
2672 read_unlock_bh(&idev->lock);
2673}
2674
2675static void addrconf_dad_timer(unsigned long data)
2676{
2677 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2678 struct inet6_dev *idev = ifp->idev;
2679 struct in6_addr unspec;
2680 struct in6_addr mcaddr;
2681
2682 read_lock_bh(&idev->lock);
2683 if (idev->dead) {
2684 read_unlock_bh(&idev->lock);
2685 goto out;
2686 }
2687 spin_lock_bh(&ifp->lock);
2688 if (ifp->probes == 0) {
2689 /*
2690 * DAD was successful
2691 */
2692
95c385b4 2693 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2694 spin_unlock_bh(&ifp->lock);
2695 read_unlock_bh(&idev->lock);
2696
2697 addrconf_dad_completed(ifp);
2698
2699 goto out;
2700 }
2701
2702 ifp->probes--;
2703 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2704 spin_unlock_bh(&ifp->lock);
2705 read_unlock_bh(&idev->lock);
2706
2707 /* send a neighbour solicitation for our addr */
2708 memset(&unspec, 0, sizeof(unspec));
2709 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2710 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2711out:
2712 in6_ifa_put(ifp);
2713}
2714
2715static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2716{
2717 struct net_device * dev = ifp->idev->dev;
2718
2719 /*
2720 * Configure the address for reception. Now it is valid.
2721 */
2722
2723 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2724
2725 /* If added prefix is link local and forwarding is off,
2726 start sending router solicitations.
2727 */
2728
2729 if (ifp->idev->cnf.forwarding == 0 &&
2730 ifp->idev->cnf.rtr_solicits > 0 &&
2731 (dev->flags&IFF_LOOPBACK) == 0 &&
2732 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2733 struct in6_addr all_routers;
2734
2735 ipv6_addr_all_routers(&all_routers);
2736
2737 /*
2738 * If a host as already performed a random delay
2739 * [...] as part of DAD [...] there is no need
2740 * to delay again before sending the first RS
2741 */
2742 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2743
2744 spin_lock_bh(&ifp->lock);
2745 ifp->probes = 1;
2746 ifp->idev->if_flags |= IF_RS_SENT;
2747 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2748 spin_unlock_bh(&ifp->lock);
2749 }
2750}
2751
c5e33bdd
YH		 2752static void addrconf_dad_run(struct inet6_dev *idev) {
2753 struct inet6_ifaddr *ifp;
2754
2755 read_lock_bh(&idev->lock);
2756 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2757 spin_lock_bh(&ifp->lock);
2758 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2759 spin_unlock_bh(&ifp->lock);
2760 continue;
2761 }
2762 spin_unlock_bh(&ifp->lock);
2763 addrconf_dad_kick(ifp);
2764 }
2765 read_unlock_bh(&idev->lock);
2766}
2767
1da177e4
LT		 2768#ifdef CONFIG_PROC_FS
2769struct if6_iter_state {
3c40090a 2770 struct seq_net_private p;
1da177e4
LT		 2771 int bucket;
2772};
2773
2774static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2775{
2776 struct inet6_ifaddr *ifa = NULL;
2777 struct if6_iter_state *state = seq->private;
3c40090a 2778 struct net *net = state->p.net;
1da177e4
LT		 2779
2780 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2781 ifa = inet6_addr_lst[state->bucket];
3c40090a
DL		 2782
2783 while (ifa && ifa->idev->dev->nd_net != net)
2784 ifa = ifa->lst_next;
1da177e4
LT		 2785 if (ifa)
2786 break;
2787 }
2788 return ifa;
2789}
2790
2791static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2792{
2793 struct if6_iter_state *state = seq->private;
3c40090a 2794 struct net *net = state->p.net;
1da177e4
LT		 2795
2796 ifa = ifa->lst_next;
2797try_again:
3c40090a
DL		 2798 if (ifa) {
2799 if (ifa->idev->dev->nd_net != net) {
2800 ifa = ifa->lst_next;
2801 goto try_again;
2802 }
2803 }
2804
1da177e4
LT		 2805 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2806 ifa = inet6_addr_lst[state->bucket];
2807 goto try_again;
2808 }
3c40090a 2809
1da177e4
LT		 2810 return ifa;
2811}
2812
2813static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2814{
2815 struct inet6_ifaddr *ifa = if6_get_first(seq);
2816
2817 if (ifa)
2818 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2819 --pos;
2820 return pos ? NULL : ifa;
2821}
2822
2823static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2824 __acquires(addrconf_hash_lock)
1da177e4
LT		 2825{
2826 read_lock_bh(&addrconf_hash_lock);
2827 return if6_get_idx(seq, *pos);
2828}
2829
2830static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2831{
2832 struct inet6_ifaddr *ifa;
2833
2834 ifa = if6_get_next(seq, v);
2835 ++*pos;
2836 return ifa;
2837}
2838
2839static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2840 __releases(addrconf_hash_lock)
1da177e4
LT		 2841{
2842 read_unlock_bh(&addrconf_hash_lock);
2843}
2844
2845static int if6_seq_show(struct seq_file *seq, void *v)
2846{
2847 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2848 seq_printf(seq,
9343e79a 2849 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2850 NIP6(ifp->addr),
2851 ifp->idev->dev->ifindex,
2852 ifp->prefix_len,
2853 ifp->scope,
2854 ifp->flags,
2855 ifp->idev->dev->name);
2856 return 0;
2857}
2858
56b3d975 2859static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2860 .start = if6_seq_start,
2861 .next = if6_seq_next,
2862 .show = if6_seq_show,
2863 .stop = if6_seq_stop,
2864};
2865
2866static int if6_seq_open(struct inode *inode, struct file *file)
2867{
3c40090a
DL		 2868 return seq_open_net(inode, file, &if6_seq_ops,
2869 sizeof(struct if6_iter_state));
1da177e4
LT		 2870}
2871
9a32144e 2872static const struct file_operations if6_fops = {
1da177e4
LT		 2873 .owner = THIS_MODULE,
2874 .open = if6_seq_open,
2875 .read = seq_read,
2876 .llseek = seq_lseek,
3c40090a 2877 .release = seq_release_net,
1da177e4
LT		 2878};
2879
3c40090a 2880static int if6_proc_net_init(struct net *net)
1da177e4 2881{
3c40090a 2882 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2883 return -ENOMEM;
2884 return 0;
2885}
2886
3c40090a
DL		 2887static void if6_proc_net_exit(struct net *net)
2888{
2889 proc_net_remove(net, "if_inet6");
2890}
2891
2892static struct pernet_operations if6_proc_net_ops = {
2893 .init = if6_proc_net_init,
2894 .exit = if6_proc_net_exit,
2895};
2896
2897int __init if6_proc_init(void)
2898{
2899 return register_pernet_subsys(&if6_proc_net_ops);
2900}
2901
1da177e4
LT		 2902void if6_proc_exit(void)
2903{
3c40090a 2904 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2905}
2906#endif /* CONFIG_PROC_FS */
2907
59fbb3a6 2908#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2909/* Check if address is a home address configured on any interface. */
389f6612 2910int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2911{
2912 int ret = 0;
2913 struct inet6_ifaddr * ifp;
2914 u8 hash = ipv6_addr_hash(addr);
2915 read_lock_bh(&addrconf_hash_lock);
2916 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
389f6612
DL		 2917 if (ifp->idev->dev->nd_net != net)
2918 continue;
3b9f9a1c
NT		 2919 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2920 (ifp->flags & IFA_F_HOMEADDRESS)) {
2921 ret = 1;
2922 break;
2923 }
2924 }
2925 read_unlock_bh(&addrconf_hash_lock);
2926 return ret;
2927}
2928#endif
2929
1da177e4
LT		 2930/*
2931 * Periodic address status verification
2932 */
2933
2934static void addrconf_verify(unsigned long foo)
2935{
2936 struct inet6_ifaddr *ifp;
2937 unsigned long now, next;
2938 int i;
2939
2940 spin_lock_bh(&addrconf_verify_lock);
2941 now = jiffies;
2942 next = now + ADDR_CHECK_FREQUENCY;
2943
2944 del_timer(&addr_chk_timer);
2945
2946 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2947
2948restart:
5d5780df 2949 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2950 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2951 unsigned long age;
2952#ifdef CONFIG_IPV6_PRIVACY
2953 unsigned long regen_advance;
2954#endif
2955
2956 if (ifp->flags & IFA_F_PERMANENT)
2957 continue;
2958
2959 spin_lock(&ifp->lock);
2960 age = (now - ifp->tstamp) / HZ;
2961
2962#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2963 regen_advance = ifp->idev->cnf.regen_max_retry *
2964 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2965 ifp->idev->nd_parms->retrans_time / HZ;
2966#endif
2967
8f27ebb9
YH		 2968 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2969 age >= ifp->valid_lft) {
1da177e4
LT		 2970 spin_unlock(&ifp->lock);
2971 in6_ifa_hold(ifp);
5d5780df 2972 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2973 ipv6_del_addr(ifp);
2974 goto restart;
8f27ebb9
YH		 2975 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2976 spin_unlock(&ifp->lock);
2977 continue;
1da177e4
LT		 2978 } else if (age >= ifp->prefered_lft) {
2979 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2980 int deprecate = 0;
2981
2982 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2983 deprecate = 1;
2984 ifp->flags |= IFA_F_DEPRECATED;
2985 }
2986
2987 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2988 next = ifp->tstamp + ifp->valid_lft * HZ;
2989
2990 spin_unlock(&ifp->lock);
2991
2992 if (deprecate) {
2993 in6_ifa_hold(ifp);
5d5780df 2994 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2995
2996 ipv6_ifa_notify(0, ifp);
2997 in6_ifa_put(ifp);
2998 goto restart;
2999 }
3000#ifdef CONFIG_IPV6_PRIVACY
3001 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3002 !(ifp->flags&IFA_F_TENTATIVE)) {
3003 if (age >= ifp->prefered_lft - regen_advance) {
3004 struct inet6_ifaddr *ifpub = ifp->ifpub;
3005 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3006 next = ifp->tstamp + ifp->prefered_lft * HZ;
3007 if (!ifp->regen_count && ifpub) {
3008 ifp->regen_count++;
3009 in6_ifa_hold(ifp);
3010 in6_ifa_hold(ifpub);
3011 spin_unlock(&ifp->lock);
5d5780df 3012 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3013 spin_lock(&ifpub->lock);
3014 ifpub->regen_count = 0;
3015 spin_unlock(&ifpub->lock);
1da177e4
LT		 3016 ipv6_create_tempaddr(ifpub, ifp);
3017 in6_ifa_put(ifpub);
3018 in6_ifa_put(ifp);
3019 goto restart;
3020 }
3021 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3022 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3023 spin_unlock(&ifp->lock);
3024#endif
3025 } else {
3026 /* ifp->prefered_lft <= ifp->valid_lft */
3027 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3028 next = ifp->tstamp + ifp->prefered_lft * HZ;
3029 spin_unlock(&ifp->lock);
3030 }
3031 }
5d5780df 3032 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3033 }
3034
3035 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3036 add_timer(&addr_chk_timer);
3037 spin_unlock_bh(&addrconf_verify_lock);
3038}
3039
461d8837
TG		 3040static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3041{
3042 struct in6_addr *pfx = NULL;
3043
3044 if (addr)
3045 pfx = nla_data(addr);
3046
3047 if (local) {
3048 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3049 pfx = NULL;
3050 else
3051 pfx = nla_data(local);
3052 }
3053
3054 return pfx;
3055}
3056
ef7c79ed 3057static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3058 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3059 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3060 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3061};
3062
1da177e4
LT		 3063static int
3064inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3065{
b854272b 3066 struct net *net = skb->sk->sk_net;
b933f716
TG		 3067 struct ifaddrmsg *ifm;
3068 struct nlattr *tb[IFA_MAX+1];
1da177e4 3069 struct in6_addr *pfx;
b933f716 3070 int err;
1da177e4 3071
b854272b
DL		 3072 if (net != &init_net)
3073 return -EINVAL;
3074
b933f716
TG		 3075 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3076 if (err < 0)
3077 return err;
3078
3079 ifm = nlmsg_data(nlh);
3080 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3081 if (pfx == NULL)
3082 return -EINVAL;
3083
3084 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3085}
3086
55ebaef1
NT		 3087static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3088 u32 prefered_lft, u32 valid_lft)
081bba5b 3089{
46d48046
YH		 3090 u32 flags = RTF_EXPIRES;
3091
081bba5b
NT		 3092 if (!valid_lft || (prefered_lft > valid_lft))
3093 return -EINVAL;
3094
46d48046 3095 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3096 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3097 flags = 0;
3098 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3099 valid_lft = 0x7FFFFFFF/HZ;
3100
3101 if (prefered_lft == 0)
55ebaef1 3102 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3103 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3104 (prefered_lft != INFINITY_LIFE_TIME))
3105 prefered_lft = 0x7FFFFFFF/HZ;
3106
3107 spin_lock_bh(&ifp->lock);
3b9f9a1c 3108 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3109 ifp->tstamp = jiffies;
3110 ifp->valid_lft = valid_lft;
3111 ifp->prefered_lft = prefered_lft;
3112
3113 spin_unlock_bh(&ifp->lock);
3114 if (!(ifp->flags&IFA_F_TENTATIVE))
3115 ipv6_ifa_notify(0, ifp);
081bba5b 3116
46d48046
YH		 3117 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3118 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3119 addrconf_verify(0);
3120
3121 return 0;
3122}
3123
1da177e4
LT		 3124static int
3125inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3126{
b854272b 3127 struct net *net = skb->sk->sk_net;
461d8837
TG		 3128 struct ifaddrmsg *ifm;
3129 struct nlattr *tb[IFA_MAX+1];
1da177e4 3130 struct in6_addr *pfx;
7198f8ce
TG		 3131 struct inet6_ifaddr *ifa;
3132 struct net_device *dev;
55ebaef1
NT		 3133 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3134 u8 ifa_flags;
461d8837 3135 int err;
1da177e4 3136
b854272b
DL		 3137 if (net != &init_net)
3138 return -EINVAL;
3139
461d8837
TG		 3140 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3141 if (err < 0)
3142 return err;
3143
3144 ifm = nlmsg_data(nlh);
3145 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3146 if (pfx == NULL)
3147 return -EINVAL;
3148
461d8837 3149 if (tb[IFA_CACHEINFO]) {
0778769d 3150 struct ifa_cacheinfo *ci;
461d8837
TG		 3151
3152 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3153 valid_lft = ci->ifa_valid;
461d8837
TG		 3154 preferred_lft = ci->ifa_prefered;
3155 } else {
3156 preferred_lft = INFINITY_LIFE_TIME;
3157 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3158 }
3159
881d966b 3160 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3161 if (dev == NULL)
3162 return -ENODEV;
3163
55ebaef1 3164 /* We ignore other flags so far. */
3b9f9a1c 3165 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3166
1cab3da6 3167 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3168 if (ifa == NULL) {
3169 /*
3170 * It would be best to check for !NLM_F_CREATE here but
3171 * userspace alreay relies on not having to provide this.
3172 */
3173 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3174 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3175 }
3176
7198f8ce
TG		 3177 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3178 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3179 err = -EEXIST;
3180 else
55ebaef1 3181 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3182
3183 in6_ifa_put(ifa);
3184
3185 return err;
1da177e4
LT		 3186}
3187
101bb229
TG		 3188static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3189 u8 scope, int ifindex)
3190{
3191 struct ifaddrmsg *ifm;
3192
3193 ifm = nlmsg_data(nlh);
3194 ifm->ifa_family = AF_INET6;
3195 ifm->ifa_prefixlen = prefixlen;
3196 ifm->ifa_flags = flags;
3197 ifm->ifa_scope = scope;
3198 ifm->ifa_index = ifindex;
3199}
3200
85486af0
TG		 3201static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3202 unsigned long tstamp, u32 preferred, u32 valid)
3203{
3204 struct ifa_cacheinfo ci;
3205
3206 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3207 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3208 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3209 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3210 ci.ifa_prefered = preferred;
3211 ci.ifa_valid = valid;
3212
3213 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3214}
3215
101bb229
TG		 3216static inline int rt_scope(int ifa_scope)
3217{
3218 if (ifa_scope & IFA_HOST)
3219 return RT_SCOPE_HOST;
3220 else if (ifa_scope & IFA_LINK)
3221 return RT_SCOPE_LINK;
3222 else if (ifa_scope & IFA_SITE)
3223 return RT_SCOPE_SITE;
3224 else
3225 return RT_SCOPE_UNIVERSE;
3226}
3227
0ab6803b
TG		 3228static inline int inet6_ifaddr_msgsize(void)
3229{
339bf98f
TG		 3230 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3231 + nla_total_size(16) /* IFA_ADDRESS */
3232 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3233}
c5396a31 3234
1da177e4 3235static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3236 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3237{
1da177e4 3238 struct nlmsghdr *nlh;
85486af0 3239 u32 preferred, valid;
1da177e4 3240
0ab6803b
TG		 3241 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3242 if (nlh == NULL)
26932566 3243 return -EMSGSIZE;
0ab6803b 3244
101bb229
TG		 3245 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3246 ifa->idev->dev->ifindex);
3247
1da177e4 3248 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3249 preferred = ifa->prefered_lft;
3250 valid = ifa->valid_lft;
3251 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3252 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3253 preferred -= tval;
3254 if (valid != INFINITY_LIFE_TIME)
3255 valid -= tval;
1da177e4
LT		 3256 }
3257 } else {
85486af0
TG		 3258 preferred = INFINITY_LIFE_TIME;
3259 valid = INFINITY_LIFE_TIME;
3260 }
3261
0ab6803b 3262 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3263 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3264 nlmsg_cancel(skb, nlh);
3265 return -EMSGSIZE;
3266 }
1da177e4 3267
0ab6803b 3268 return nlmsg_end(skb, nlh);
1da177e4
LT		 3269}
3270
3271static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3272 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3273{
1da177e4 3274 struct nlmsghdr *nlh;
101bb229
TG		 3275 u8 scope = RT_SCOPE_UNIVERSE;
3276 int ifindex = ifmca->idev->dev->ifindex;
3277
3278 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3279 scope = RT_SCOPE_SITE;
1da177e4 3280
0ab6803b
TG		 3281 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3282 if (nlh == NULL)
26932566 3283 return -EMSGSIZE;
85486af0 3284
0ab6803b
TG		 3285 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3286 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3287 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3288 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3289 nlmsg_cancel(skb, nlh);
3290 return -EMSGSIZE;
3291 }
85486af0 3292
0ab6803b 3293 return nlmsg_end(skb, nlh);
1da177e4
LT		 3294}
3295
3296static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3297 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3298{
1da177e4 3299 struct nlmsghdr *nlh;
101bb229
TG		 3300 u8 scope = RT_SCOPE_UNIVERSE;
3301 int ifindex = ifaca->aca_idev->dev->ifindex;
3302
3303 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3304 scope = RT_SCOPE_SITE;
1da177e4 3305
0ab6803b
TG		 3306 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3307 if (nlh == NULL)
26932566 3308 return -EMSGSIZE;
85486af0 3309
0ab6803b
TG		 3310 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3311 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3312 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3313 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3314 nlmsg_cancel(skb, nlh);
3315 return -EMSGSIZE;
3316 }
1da177e4 3317
0ab6803b 3318 return nlmsg_end(skb, nlh);
1da177e4
LT		 3319}
3320
3321enum addr_type_t
3322{
3323 UNICAST_ADDR,
3324 MULTICAST_ADDR,
3325 ANYCAST_ADDR,
3326};
3327
3328static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3329 enum addr_type_t type)
3330{
3331 int idx, ip_idx;
3332 int s_idx, s_ip_idx;
3333 int err = 1;
3334 struct net_device *dev;
3335 struct inet6_dev *idev = NULL;
3336 struct inet6_ifaddr *ifa;
3337 struct ifmcaddr6 *ifmca;
3338 struct ifacaddr6 *ifaca;
3339
3340 s_idx = cb->args[0];
3341 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3342
7562f876 3343 idx = 0;
881d966b 3344 for_each_netdev(&init_net, dev) {
1da177e4 3345 if (idx < s_idx)
7562f876 3346 goto cont;
1da177e4
LT		 3347 if (idx > s_idx)
3348 s_ip_idx = 0;
3349 ip_idx = 0;
3350 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3351 goto cont;
1da177e4
LT		 3352 read_lock_bh(&idev->lock);
3353 switch (type) {
3354 case UNICAST_ADDR:
ae9cda5d 3355 /* unicast address incl. temp addr */
1da177e4
LT		 3356 for (ifa = idev->addr_list; ifa;
3357 ifa = ifa->if_next, ip_idx++) {
3358 if (ip_idx < s_ip_idx)
3359 continue;
5d5619b4
YH		 3360 err = inet6_fill_ifaddr(skb, ifa,
3361 NETLINK_CB(cb->skb).pid,
3362 cb->nlh->nlmsg_seq,
3363 RTM_NEWADDR,
3364 NLM_F_MULTI);
1da177e4 3365 }
1da177e4
LT		 3366 break;
3367 case MULTICAST_ADDR:
3368 /* multicast address */
1ab1457c 3369 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3370 ifmca = ifmca->next, ip_idx++) {
3371 if (ip_idx < s_ip_idx)
3372 continue;
5d5619b4
YH		 3373 err = inet6_fill_ifmcaddr(skb, ifmca,
3374 NETLINK_CB(cb->skb).pid,
3375 cb->nlh->nlmsg_seq,
3376 RTM_GETMULTICAST,
3377 NLM_F_MULTI);
1da177e4
LT		 3378 }
3379 break;
3380 case ANYCAST_ADDR:
3381 /* anycast address */
3382 for (ifaca = idev->ac_list; ifaca;
3383 ifaca = ifaca->aca_next, ip_idx++) {
3384 if (ip_idx < s_ip_idx)
3385 continue;
5d5619b4
YH		 3386 err = inet6_fill_ifacaddr(skb, ifaca,
3387 NETLINK_CB(cb->skb).pid,
3388 cb->nlh->nlmsg_seq,
3389 RTM_GETANYCAST,
3390 NLM_F_MULTI);
1da177e4
LT		 3391 }
3392 break;
3393 default:
3394 break;
3395 }
3396 read_unlock_bh(&idev->lock);
3397 in6_dev_put(idev);
5d5619b4
YH		 3398
3399 if (err <= 0)
3400 break;
7562f876
PE		 3401cont:
3402 idx++;
1da177e4 3403 }
1da177e4
LT		 3404 cb->args[0] = idx;
3405 cb->args[1] = ip_idx;
3406 return skb->len;
3407}
3408
3409static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3410{
b854272b 3411 struct net *net = skb->sk->sk_net;
1da177e4 3412 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3413
3414 if (net != &init_net)
3415 return 0;
3416
1da177e4
LT		 3417 return inet6_dump_addr(skb, cb, type);
3418}
3419
3420static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3421{
b854272b 3422 struct net *net = skb->sk->sk_net;
1da177e4 3423 enum addr_type_t type = MULTICAST_ADDR;
b854272b
DL		 3424
3425 if (net != &init_net)
3426 return 0;
3427
1da177e4
LT		 3428 return inet6_dump_addr(skb, cb, type);
3429}
3430
3431
3432static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3433{
b854272b 3434 struct net *net = skb->sk->sk_net;
1da177e4 3435 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3436
3437 if (net != &init_net)
3438 return 0;
3439
1da177e4
LT		 3440 return inet6_dump_addr(skb, cb, type);
3441}
3442
1b29fc2c
TG		 3443static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3444 void *arg)
6c223828 3445{
b854272b 3446 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3447 struct ifaddrmsg *ifm;
3448 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3449 struct in6_addr *addr = NULL;
3450 struct net_device *dev = NULL;
3451 struct inet6_ifaddr *ifa;
3452 struct sk_buff *skb;
6c223828
NT		 3453 int err;
3454
b854272b
DL		 3455 if (net != &init_net)
3456 return -EINVAL;
3457
1b29fc2c
TG		 3458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3459 if (err < 0)
3460 goto errout;
3461
3462 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3463 if (addr == NULL) {
3464 err = -EINVAL;
3465 goto errout;
6c223828 3466 }
6c223828 3467
1b29fc2c 3468 ifm = nlmsg_data(nlh);
6c223828 3469 if (ifm->ifa_index)
881d966b 3470 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3471
1cab3da6 3472 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3473 err = -EADDRNOTAVAIL;
3474 goto errout;
3475 }
6c223828 3476
0ab6803b 3477 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3478 err = -ENOBUFS;
1b29fc2c 3479 goto errout_ifa;
6c223828
NT		 3480 }
3481
6c223828
NT		 3482 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3483 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3484 if (err < 0) {
3485 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3486 WARN_ON(err == -EMSGSIZE);
3487 kfree_skb(skb);
3488 goto errout_ifa;
3489 }
97c53cac 3490 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3491errout_ifa:
6c223828 3492 in6_ifa_put(ifa);
1b29fc2c 3493errout:
6c223828 3494 return err;
6c223828
NT		 3495}
3496
1da177e4
LT		 3497static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3498{
3499 struct sk_buff *skb;
5d620266 3500 int err = -ENOBUFS;
1da177e4 3501
0ab6803b 3502 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3503 if (skb == NULL)
3504 goto errout;
3505
3506 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3507 if (err < 0) {
3508 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3509 WARN_ON(err == -EMSGSIZE);
3510 kfree_skb(skb);
3511 goto errout;
3512 }
97c53cac 3513 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3514errout:
3515 if (err < 0)
97c53cac 3516 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3517}
3518
b6f99a21 3519static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3520 __s32 *array, int bytes)
3521{
04561c1f
TG		 3522 BUG_ON(bytes < (DEVCONF_MAX * 4));
3523
1da177e4
LT		 3524 memset(array, 0, bytes);
3525 array[DEVCONF_FORWARDING] = cnf->forwarding;
3526 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3527 array[DEVCONF_MTU6] = cnf->mtu6;
3528 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3529 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3530 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3531 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3532 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3533 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3534 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3535 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3536#ifdef CONFIG_IPV6_PRIVACY
3537 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3538 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3539 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3540 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3541 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3542#endif
3543 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3544 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3545 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3546#ifdef CONFIG_IPV6_ROUTER_PREF
3547 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3548 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3549#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3550 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3551#endif
930d6ff2 3552#endif
fbea49e1 3553 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3554 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3555#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3556 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3557#endif
1da177e4
LT		 3558}
3559
339bf98f
TG		 3560static inline size_t inet6_if_nlmsg_size(void)
3561{
3562 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3563 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3564 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3565 + nla_total_size(4) /* IFLA_MTU */
3566 + nla_total_size(4) /* IFLA_LINK */
3567 + nla_total_size( /* IFLA_PROTINFO */
3568 nla_total_size(4) /* IFLA_INET6_FLAGS */
3569 + nla_total_size(sizeof(struct ifla_cacheinfo))
3570 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3571 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3572 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3573 );
3574}
c5396a31 3575
7f7d9a6b
HX		 3576static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3577 int bytes)
3578{
3579 int i;
3580 int pad = bytes - sizeof(u64) * items;
3581 BUG_ON(pad < 0);
3582
3583 /* Use put_unaligned() because stats may not be aligned for u64. */
3584 put_unaligned(items, &stats[0]);
3585 for (i = 1; i < items; i++)
3586 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3587
3588 memset(&stats[items], 0, pad);
3589}
3590
3591static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3592 int bytes)
3593{
3594 switch(attrtype) {
3595 case IFLA_INET6_STATS:
3596 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3597 break;
3598 case IFLA_INET6_ICMP6STATS:
3599 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3600 break;
3601 }
3602}
3603
1ab1457c 3604static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3605 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3606{
04561c1f 3607 struct net_device *dev = idev->dev;
bf99f1bd 3608 struct nlattr *nla;
04561c1f
TG		 3609 struct ifinfomsg *hdr;
3610 struct nlmsghdr *nlh;
3611 void *protoinfo;
3612 struct ifla_cacheinfo ci;
3613
3614 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3615 if (nlh == NULL)
26932566 3616 return -EMSGSIZE;
04561c1f
TG		 3617
3618 hdr = nlmsg_data(nlh);
3619 hdr->ifi_family = AF_INET6;
3620 hdr->__ifi_pad = 0;
3621 hdr->ifi_type = dev->type;
3622 hdr->ifi_index = dev->ifindex;
3623 hdr->ifi_flags = dev_get_flags(dev);
3624 hdr->ifi_change = 0;
3625
3626 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3627
3628 if (dev->addr_len)
04561c1f 3629 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3630
04561c1f 3631 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3632 if (dev->ifindex != dev->iflink)
04561c1f 3633 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3634
04561c1f
TG		 3635 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3636 if (protoinfo == NULL)
3637 goto nla_put_failure;
1da177e4 3638
04561c1f 3639 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3640
1da177e4
LT		 3641 ci.max_reasm_len = IPV6_MAXPLEN;
3642 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3643 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3644 ci.reachable_time = idev->nd_parms->reachable_time;
3645 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3646 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3647
bf99f1bd
YH		 3648 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3649 if (nla == NULL)
04561c1f 3650 goto nla_put_failure;
bf99f1bd 3651 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3652
bf99f1bd
YH		 3653 /* XXX - MC not implemented */
3654
3655 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3656 if (nla == NULL)
3657 goto nla_put_failure;
3658 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3659
3660 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3661 if (nla == NULL)
3662 goto nla_put_failure;
3663 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3664
04561c1f
TG		 3665 nla_nest_end(skb, protoinfo);
3666 return nlmsg_end(skb, nlh);
1da177e4 3667
04561c1f 3668nla_put_failure:
26932566
PM		 3669 nlmsg_cancel(skb, nlh);
3670 return -EMSGSIZE;
1da177e4
LT		 3671}
3672
3673static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3674{
b854272b 3675 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3676 int idx, err;
3677 int s_idx = cb->args[0];
3678 struct net_device *dev;
3679 struct inet6_dev *idev;
3680
b854272b
DL		 3681 if (net != &init_net)
3682 return 0;
3683
1da177e4 3684 read_lock(&dev_base_lock);
7562f876 3685 idx = 0;
881d966b 3686 for_each_netdev(&init_net, dev) {
1da177e4 3687 if (idx < s_idx)
7562f876 3688 goto cont;
1da177e4 3689 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3690 goto cont;
1ab1457c 3691 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3692 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3693 in6_dev_put(idev);
3694 if (err <= 0)
3695 break;
7562f876
PE		 3696cont:
3697 idx++;
1da177e4
LT		 3698 }
3699 read_unlock(&dev_base_lock);
3700 cb->args[0] = idx;
3701
3702 return skb->len;
3703}
3704
3705void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3706{
3707 struct sk_buff *skb;
8d7a76c9 3708 int err = -ENOBUFS;
1ab1457c 3709
339bf98f 3710 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3711 if (skb == NULL)
3712 goto errout;
3713
3714 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3715 if (err < 0) {
3716 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3717 WARN_ON(err == -EMSGSIZE);
3718 kfree_skb(skb);
3719 goto errout;
3720 }
97c53cac 3721 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3722errout:
3723 if (err < 0)
97c53cac 3724 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3725}
3726
339bf98f
TG		 3727static inline size_t inet6_prefix_nlmsg_size(void)
3728{
3729 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3730 + nla_total_size(sizeof(struct in6_addr))
3731 + nla_total_size(sizeof(struct prefix_cacheinfo));
3732}
c5396a31 3733
1da177e4 3734static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3735 struct prefix_info *pinfo, u32 pid, u32 seq,
3736 int event, unsigned int flags)
1da177e4 3737{
6051e2f4
TG		 3738 struct prefixmsg *pmsg;
3739 struct nlmsghdr *nlh;
1da177e4
LT		 3740 struct prefix_cacheinfo ci;
3741
6051e2f4
TG		 3742 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3743 if (nlh == NULL)
26932566 3744 return -EMSGSIZE;
6051e2f4
TG		 3745
3746 pmsg = nlmsg_data(nlh);
1da177e4 3747 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3748 pmsg->prefix_pad1 = 0;
3749 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3750 pmsg->prefix_ifindex = idev->dev->ifindex;
3751 pmsg->prefix_len = pinfo->prefix_len;
3752 pmsg->prefix_type = pinfo->type;
8a47077a 3753 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3754 pmsg->prefix_flags = 0;
3755 if (pinfo->onlink)
3756 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3757 if (pinfo->autoconf)
3758 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3759
6051e2f4 3760 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3761
3762 ci.preferred_time = ntohl(pinfo->prefered);
3763 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3764 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3765
6051e2f4 3766 return nlmsg_end(skb, nlh);
1da177e4 3767
6051e2f4 3768nla_put_failure:
26932566
PM		 3769 nlmsg_cancel(skb, nlh);
3770 return -EMSGSIZE;
1da177e4
LT		 3771}
3772
1ab1457c 3773static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3774 struct prefix_info *pinfo)
3775{
3776 struct sk_buff *skb;
8c384bfa 3777 int err = -ENOBUFS;
1da177e4 3778
339bf98f 3779 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3780 if (skb == NULL)
3781 goto errout;
3782
3783 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3784 if (err < 0) {
3785 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3786 WARN_ON(err == -EMSGSIZE);
3787 kfree_skb(skb);
3788 goto errout;
3789 }
97c53cac 3790 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3791errout:
3792 if (err < 0)
97c53cac 3793 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3794}
3795
1da177e4
LT		 3796static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3797{
3798 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3799
3800 switch (event) {
3801 case RTM_NEWADDR:
95c385b4
NH		 3802 /*
3803 * If the address was optimistic
3804 * we inserted the route at the start of
3805 * our DAD process, so we don't need
3806 * to do it again
3807 */
3808 if (!(ifp->rt->rt6i_node))
3809 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3810 if (ifp->idev->cnf.forwarding)
3811 addrconf_join_anycast(ifp);
3812 break;
3813 case RTM_DELADDR:
3814 if (ifp->idev->cnf.forwarding)
3815 addrconf_leave_anycast(ifp);
3816 addrconf_leave_solict(ifp->idev, &ifp->addr);
3817 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3818 if (ip6_del_rt(ifp->rt))
1da177e4 3819 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3820 break;
3821 }
3822}
3823
3824static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3825{
8814c4b5 3826 rcu_read_lock_bh();
1da177e4
LT		 3827 if (likely(ifp->idev->dead == 0))
3828 __ipv6_ifa_notify(event, ifp);
8814c4b5 3829 rcu_read_unlock_bh();
1da177e4
LT		 3830}
3831
3832#ifdef CONFIG_SYSCTL
3833
3834static
3835int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3836 void __user *buffer, size_t *lenp, loff_t *ppos)
3837{
3838 int *valp = ctl->data;
3839 int val = *valp;
3840 int ret;
3841
3842 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3843
c8fecf22
PE		 3844 if (write)
3845 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3846 return ret;
1da177e4
LT		 3847}
3848
1ab1457c 3849static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3850 int __user *name, int nlen,
3851 void __user *oldval,
3852 size_t __user *oldlenp,
1f29bcd7 3853 void __user *newval, size_t newlen)
1da177e4
LT		 3854{
3855 int *valp = table->data;
c8fecf22 3856 int val = *valp;
1da177e4
LT		 3857 int new;
3858
3859 if (!newval || !newlen)
3860 return 0;
3861 if (newlen != sizeof(int))
3862 return -EINVAL;
3863 if (get_user(new, (int __user *)newval))
3864 return -EFAULT;
3865 if (new == *valp)
3866 return 0;
3867 if (oldval && oldlenp) {
3868 size_t len;
3869 if (get_user(len, oldlenp))
3870 return -EFAULT;
3871 if (len) {
3872 if (len > table->maxlen)
3873 len = table->maxlen;
3874 if (copy_to_user(oldval, valp, len))
3875 return -EFAULT;
3876 if (put_user(len, oldlenp))
3877 return -EFAULT;
3878 }
3879 }
3880
c8fecf22
PE		 3881 *valp = new;
3882 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3883 return 1;
3884}
3885
3886static struct addrconf_sysctl_table
3887{
3888 struct ctl_table_header *sysctl_header;
3889 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3890 char *dev_name;
ab32ea5d 3891} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3892 .sysctl_header = NULL,
3893 .addrconf_vars = {
1ab1457c 3894 {
1da177e4
LT		 3895 .ctl_name = NET_IPV6_FORWARDING,
3896 .procname = "forwarding",
1ab1457c 3897 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3898 .maxlen = sizeof(int),
3899 .mode = 0644,
1ab1457c 3900 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3901 .strategy = &addrconf_sysctl_forward_strategy,
3902 },
3903 {
3904 .ctl_name = NET_IPV6_HOP_LIMIT,
3905 .procname = "hop_limit",
1ab1457c 3906 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3907 .maxlen = sizeof(int),
3908 .mode = 0644,
3909 .proc_handler = proc_dointvec,
3910 },
3911 {
3912 .ctl_name = NET_IPV6_MTU,
3913 .procname = "mtu",
3914 .data = &ipv6_devconf.mtu6,
1ab1457c 3915 .maxlen = sizeof(int),
1da177e4 3916 .mode = 0644,
1ab1457c 3917 .proc_handler = &proc_dointvec,
1da177e4
LT		 3918 },
3919 {
3920 .ctl_name = NET_IPV6_ACCEPT_RA,
3921 .procname = "accept_ra",
1ab1457c 3922 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3923 .maxlen = sizeof(int),
3924 .mode = 0644,
1ab1457c 3925 .proc_handler = &proc_dointvec,
1da177e4
LT		 3926 },
3927 {
3928 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3929 .procname = "accept_redirects",
1ab1457c 3930 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3931 .maxlen = sizeof(int),
3932 .mode = 0644,
1ab1457c 3933 .proc_handler = &proc_dointvec,
1da177e4
LT		 3934 },
3935 {
3936 .ctl_name = NET_IPV6_AUTOCONF,
3937 .procname = "autoconf",
1ab1457c 3938 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3939 .maxlen = sizeof(int),
3940 .mode = 0644,
1ab1457c 3941 .proc_handler = &proc_dointvec,
1da177e4
LT		 3942 },
3943 {
3944 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3945 .procname = "dad_transmits",
1ab1457c 3946 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3947 .maxlen = sizeof(int),
3948 .mode = 0644,
1ab1457c 3949 .proc_handler = &proc_dointvec,
1da177e4
LT		 3950 },
3951 {
3952 .ctl_name = NET_IPV6_RTR_SOLICITS,
3953 .procname = "router_solicitations",
1ab1457c 3954 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3955 .maxlen = sizeof(int),
3956 .mode = 0644,
1ab1457c 3957 .proc_handler = &proc_dointvec,
1da177e4
LT		 3958 },
3959 {
3960 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3961 .procname = "router_solicitation_interval",
1ab1457c 3962 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3963 .maxlen = sizeof(int),
3964 .mode = 0644,
1ab1457c 3965 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3966 .strategy = &sysctl_jiffies,
3967 },
3968 {
3969 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3970 .procname = "router_solicitation_delay",
1ab1457c 3971 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3972 .maxlen = sizeof(int),
3973 .mode = 0644,
1ab1457c 3974 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3975 .strategy = &sysctl_jiffies,
3976 },
3977 {
3978 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3979 .procname = "force_mld_version",
1ab1457c 3980 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3981 .maxlen = sizeof(int),
3982 .mode = 0644,
1ab1457c 3983 .proc_handler = &proc_dointvec,
1da177e4
LT		 3984 },
3985#ifdef CONFIG_IPV6_PRIVACY
3986 {
3987 .ctl_name = NET_IPV6_USE_TEMPADDR,
3988 .procname = "use_tempaddr",
1ab1457c 3989 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3990 .maxlen = sizeof(int),
3991 .mode = 0644,
1ab1457c 3992 .proc_handler = &proc_dointvec,
1da177e4
LT		 3993 },
3994 {
3995 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3996 .procname = "temp_valid_lft",
1ab1457c 3997 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3998 .maxlen = sizeof(int),
3999 .mode = 0644,
1ab1457c 4000 .proc_handler = &proc_dointvec,
1da177e4
LT		 4001 },
4002 {
4003 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4004 .procname = "temp_prefered_lft",
1ab1457c 4005 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4006 .maxlen = sizeof(int),
4007 .mode = 0644,
1ab1457c 4008 .proc_handler = &proc_dointvec,
1da177e4
LT		 4009 },
4010 {
4011 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4012 .procname = "regen_max_retry",
1ab1457c 4013 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4014 .maxlen = sizeof(int),
4015 .mode = 0644,
1ab1457c 4016 .proc_handler = &proc_dointvec,
1da177e4
LT		 4017 },
4018 {
4019 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4020 .procname = "max_desync_factor",
1ab1457c 4021 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4022 .maxlen = sizeof(int),
4023 .mode = 0644,
1ab1457c 4024 .proc_handler = &proc_dointvec,
1da177e4
LT		 4025 },
4026#endif
4027 {
4028 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4029 .procname = "max_addresses",
4030 .data = &ipv6_devconf.max_addresses,
4031 .maxlen = sizeof(int),
4032 .mode = 0644,
4033 .proc_handler = &proc_dointvec,
4034 },
65f5c7c1
YH		 4035 {
4036 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4037 .procname = "accept_ra_defrtr",
1ab1457c 4038 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4039 .maxlen = sizeof(int),
4040 .mode = 0644,
1ab1457c 4041 .proc_handler = &proc_dointvec,
65f5c7c1 4042 },
c4fd30eb
YH		 4043 {
4044 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4045 .procname = "accept_ra_pinfo",
1ab1457c 4046 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4047 .maxlen = sizeof(int),
4048 .mode = 0644,
1ab1457c 4049 .proc_handler = &proc_dointvec,
c4fd30eb 4050 },
930d6ff2
YH		 4051#ifdef CONFIG_IPV6_ROUTER_PREF
4052 {
4053 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4054 .procname = "accept_ra_rtr_pref",
4055 .data = &ipv6_devconf.accept_ra_rtr_pref,
4056 .maxlen = sizeof(int),
4057 .mode = 0644,
4058 .proc_handler = &proc_dointvec,
4059 },
52e16356
YH		 4060 {
4061 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4062 .procname = "router_probe_interval",
4063 .data = &ipv6_devconf.rtr_probe_interval,
4064 .maxlen = sizeof(int),
4065 .mode = 0644,
4066 .proc_handler = &proc_dointvec_jiffies,
4067 .strategy = &sysctl_jiffies,
4068 },
fa03ef38 4069#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4070 {
4071 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4072 .procname = "accept_ra_rt_info_max_plen",
4073 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4074 .maxlen = sizeof(int),
4075 .mode = 0644,
4076 .proc_handler = &proc_dointvec,
4077 },
4078#endif
930d6ff2 4079#endif
fbea49e1
YH		 4080 {
4081 .ctl_name = NET_IPV6_PROXY_NDP,
4082 .procname = "proxy_ndp",
4083 .data = &ipv6_devconf.proxy_ndp,
4084 .maxlen = sizeof(int),
4085 .mode = 0644,
4086 .proc_handler = &proc_dointvec,
4087 },
0bcbc926
YH		 4088 {
4089 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4090 .procname = "accept_source_route",
4091 .data = &ipv6_devconf.accept_source_route,
4092 .maxlen = sizeof(int),
4093 .mode = 0644,
4094 .proc_handler = &proc_dointvec,
4095 },
95c385b4
NH		 4096#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4097 {
4098 .ctl_name = CTL_UNNUMBERED,
4099 .procname = "optimistic_dad",
4100 .data = &ipv6_devconf.optimistic_dad,
4101 .maxlen = sizeof(int),
4102 .mode = 0644,
4103 .proc_handler = &proc_dointvec,
4104
4105 },
4106#endif
1da177e4
LT		 4107 {
4108 .ctl_name = 0, /* sentinel */
4109 }
4110 },
1da177e4
LT		 4111};
4112
bff16c2f
PE		 4113static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4114 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4115{
4116 int i;
1da177e4 4117 struct addrconf_sysctl_table *t;
1da177e4 4118
1dab6222
PE		 4119#define ADDRCONF_CTL_PATH_DEV 3
4120
4121 struct ctl_path addrconf_ctl_path[] = {
4122 { .procname = "net", .ctl_name = CTL_NET, },
4123 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4124 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4125 { /* to be set */ },
4126 { },
4127 };
4128
4129
af879cc7 4130 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4131 if (t == NULL)
f68635e6
PE		 4132 goto out;
4133
1da177e4
LT		 4134 for (i=0; t->addrconf_vars[i].data; i++) {
4135 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4136 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4137 t->addrconf_vars[i].extra2 = net;
1da177e4 4138 }
1da177e4 4139
1ab1457c
YH		 4140 /*
4141 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4142 * by sysctl and we wouldn't want anyone to change it under our feet
4143 * (see SIOCSIFNAME).
1ab1457c 4144 */
1dab6222
PE		 4145 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4146 if (!t->dev_name)
f68635e6 4147 goto free;
1da177e4 4148
1dab6222
PE		 4149 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4150 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4151
bff16c2f 4152 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4153 t->addrconf_vars);
1da177e4
LT		 4154 if (t->sysctl_header == NULL)
4155 goto free_procname;
f68635e6
PE		 4156
4157 p->sysctl = t;
95897312 4158 return 0;
1da177e4 4159
f68635e6 4160free_procname:
1dab6222 4161 kfree(t->dev_name);
f68635e6 4162free:
1da177e4 4163 kfree(t);
f68635e6 4164out:
95897312 4165 return -ENOBUFS;
1da177e4
LT		 4166}
4167
408c4768
PE		 4168static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4169{
4170 struct addrconf_sysctl_table *t;
4171
4172 if (p->sysctl == NULL)
4173 return;
4174
4175 t = p->sysctl;
4176 p->sysctl = NULL;
4177 unregister_sysctl_table(t->sysctl_header);
4178 kfree(t->dev_name);
4179 kfree(t);
4180}
4181
f52295a9
PE		 4182static void addrconf_sysctl_register(struct inet6_dev *idev)
4183{
408c4768
PE		 4184 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4185 NET_IPV6_NEIGH, "ipv6",
4186 &ndisc_ifinfo_sysctl_change,
4187 NULL);
bff16c2f
PE		 4188 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4189 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4190}
4191
408c4768 4192static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4193{
408c4768
PE		 4194 __addrconf_sysctl_unregister(&idev->cnf);
4195 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4196}
4197
4198
4199#endif
4200
e0da5a48
PE		 4201static int addrconf_init_net(struct net *net)
4202{
4203 int err;
4204 struct ipv6_devconf *all, *dflt;
4205
4206 err = -ENOMEM;
4207 all = &ipv6_devconf;
4208 dflt = &ipv6_devconf_dflt;
4209
4210 if (net != &init_net) {
4211 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4212 if (all == NULL)
4213 goto err_alloc_all;
4214
4215 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4216 if (dflt == NULL)
4217 goto err_alloc_dflt;
4218 }
4219
4220 net->ipv6.devconf_all = all;
4221 net->ipv6.devconf_dflt = dflt;
4222
4223#ifdef CONFIG_SYSCTL
4224 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4225 NULL, all);
4226 if (err < 0)
4227 goto err_reg_all;
4228
4229 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4230 NULL, dflt);
4231 if (err < 0)
4232 goto err_reg_dflt;
4233#endif
4234 return 0;
4235
4236#ifdef CONFIG_SYSCTL
4237err_reg_dflt:
4238 __addrconf_sysctl_unregister(all);
4239err_reg_all:
4240 kfree(dflt);
4241#endif
4242err_alloc_dflt:
4243 kfree(all);
4244err_alloc_all:
4245 return err;
4246}
4247
4248static void addrconf_exit_net(struct net *net)
4249{
4250#ifdef CONFIG_SYSCTL
4251 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4252 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4253#endif
4254 if (net != &init_net) {
4255 kfree(net->ipv6.devconf_dflt);
4256 kfree(net->ipv6.devconf_all);
4257 }
4258}
4259
4260static struct pernet_operations addrconf_ops = {
4261 .init = addrconf_init_net,
4262 .exit = addrconf_exit_net,
4263};
4264
1da177e4
LT		 4265/*
4266 * Device notifier
4267 */
4268
4269int register_inet6addr_notifier(struct notifier_block *nb)
4270{
1ab1457c 4271 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4272}
4273
7159039a
YH		 4274EXPORT_SYMBOL(register_inet6addr_notifier);
4275
1da177e4
LT		 4276int unregister_inet6addr_notifier(struct notifier_block *nb)
4277{
1ab1457c 4278 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4279}
4280
7159039a
YH		 4281EXPORT_SYMBOL(unregister_inet6addr_notifier);
4282
1da177e4
LT		 4283/*
4284 * Init / cleanup code
4285 */
4286
4287int __init addrconf_init(void)
4288{
2a8cc6c8
YH		 4289 int err;
4290
4291 if ((err = ipv6_addr_label_init()) < 0) {
4292 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4293 err);
4294 return err;
4295 }
1da177e4 4296
e0da5a48
PE		 4297 register_pernet_subsys(&addrconf_ops);
4298
1da177e4
LT		 4299 /* The addrconf netdev notifier requires that loopback_dev
4300 * has it's ipv6 private information allocated and setup
4301 * before it can bring up and give link-local addresses
4302 * to other devices which are up.
4303 *
4304 * Unfortunately, loopback_dev is not necessarily the first
4305 * entry in the global dev_base list of net devices. In fact,
4306 * it is likely to be the very last entry on that list.
4307 * So this causes the notifier registry below to try and
4308 * give link-local addresses to all devices besides loopback_dev
4309 * first, then loopback_dev, which cases all the non-loopback_dev
4310 * devices to fail to get a link-local address.
4311 *
4312 * So, as a temporary fix, allocate the ipv6 structure for
4313 * loopback_dev first by hand.
4314 * Longer term, all of the dependencies ipv6 has upon the loopback
4315 * device and it being up should be removed.
4316 */
4317 rtnl_lock();
2774c7ab 4318 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4319 err = -ENOMEM;
4320 rtnl_unlock();
4321 if (err)
e0da5a48 4322 goto errlo;
1da177e4 4323
2774c7ab
EB		 4324 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4325 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4326#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4327 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4328 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4329 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4330 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4331#endif
c62dba90 4332
1da177e4
LT		 4333 register_netdevice_notifier(&ipv6_dev_notf);
4334
1da177e4 4335 addrconf_verify(0);
c127ea2c
TG		 4336
4337 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4338 if (err < 0)
4339 goto errout;
4340
4341 /* Only the first call to __rtnl_register can fail */
4342 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4343 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4344 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4345 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4346 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4347
2a8cc6c8
YH		 4348 ipv6_addr_label_rtnl_register();
4349
1da177e4 4350 return 0;
c127ea2c
TG		 4351errout:
4352 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4353errlo:
4354 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4355
4356 return err;
1da177e4
LT		 4357}
4358
09f7709f 4359void addrconf_cleanup(void)
1da177e4 4360{
1ab1457c 4361 struct net_device *dev;
1ab1457c 4362 struct inet6_ifaddr *ifa;
1da177e4
LT		 4363 int i;
4364
4365 unregister_netdevice_notifier(&ipv6_dev_notf);
4366
e0da5a48 4367 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4368
4369 rtnl_lock();
4370
4371 /*
4372 * clean dev list.
4373 */
4374
881d966b 4375 for_each_netdev(&init_net, dev) {
dffe4f04 4376 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4377 continue;
4378 addrconf_ifdown(dev, 1);
4379 }
2774c7ab 4380 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4381
4382 /*
4383 * Check hash table.
4384 */
4385
4386 write_lock_bh(&addrconf_hash_lock);
4387 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4388 for (ifa=inet6_addr_lst[i]; ifa; ) {
4389 struct inet6_ifaddr *bifa;
4390
4391 bifa = ifa;
4392 ifa = ifa->lst_next;
4393 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4394 /* Do not free it; something is wrong.
4395 Now we can investigate it with debugger.
4396 */
4397 }
4398 }
4399 write_unlock_bh(&addrconf_hash_lock);
4400
4401 del_timer(&addr_chk_timer);
4402
4403 rtnl_unlock();
1da177e4 4404}
Clone of davem's net-next-2.6 tree