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[IPV6]: Use XOR and OR rather than mutiple ands for ipv6 address comparisons.
[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;
c346dca1 338 memcpy(&ndev->cnf, dev_net(dev)->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",
0dc47877 352 __func__, dev->name));
322f74a4
IO		 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",
0dc47877 362 __func__, dev->name));
322f74a4
IO		 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
7bc570c8 415struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
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)
7b4da532 496 rt6_purge_dflt_routers(net);
c8fecf22 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 */
c346dca1 564 if (ipv6_chk_same_addr(dev_net(idev->dev), 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;
c346dca1 754 struct net *net = dev_net(ifp->idev->dev);
1da177e4 755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 756 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4
LT		 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 */
a9b05723
YH		 896enum {
897 IPV6_SADDR_RULE_INIT = 0,
898 IPV6_SADDR_RULE_LOCAL,
899 IPV6_SADDR_RULE_SCOPE,
900 IPV6_SADDR_RULE_PREFERRED,
901#ifdef CONFIG_IPV6_MIP6
902 IPV6_SADDR_RULE_HOA,
903#endif
904 IPV6_SADDR_RULE_OIF,
905 IPV6_SADDR_RULE_LABEL,
906#ifdef CONFIG_IPV6_PRIVACY
907 IPV6_SADDR_RULE_PRIVACY,
908#endif
909 IPV6_SADDR_RULE_ORCHID,
910 IPV6_SADDR_RULE_PREFIX,
911 IPV6_SADDR_RULE_MAX
912};
913
072047e4 914struct ipv6_saddr_score {
a9b05723
YH		 915 int rule;
916 int addr_type;
917 struct inet6_ifaddr *ifa;
918 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
919 int scopedist;
920 int matchlen;
072047e4
YH		 921};
922
a9b05723
YH		 923struct ipv6_saddr_dst {
924 struct in6_addr *addr;
925 int ifindex;
926 int scope;
927 int label;
7cbca67c 928 unsigned int prefs;
a9b05723 929};
072047e4 930
b6f99a21 931static inline int ipv6_saddr_preferred(int type)
1da177e4 932{
072047e4
YH		 933 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
934 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
935 return 1;
936 return 0;
1da177e4
LT		 937}
938
a9b05723
YH		 939static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
940 struct ipv6_saddr_dst *dst,
941 int i)
942{
943 int ret;
944
945 if (i <= score->rule) {
946 switch (i) {
947 case IPV6_SADDR_RULE_SCOPE:
948 ret = score->scopedist;
949 break;
950 case IPV6_SADDR_RULE_PREFIX:
951 ret = score->matchlen;
952 break;
953 default:
954 ret = !!test_bit(i, score->scorebits);
955 }
956 goto out;
957 }
958
959 switch (i) {
960 case IPV6_SADDR_RULE_INIT:
961 /* Rule 0: remember if hiscore is not ready yet */
962 ret = !!score->ifa;
963 break;
964 case IPV6_SADDR_RULE_LOCAL:
965 /* Rule 1: Prefer same address */
966 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
967 break;
968 case IPV6_SADDR_RULE_SCOPE:
969 /* Rule 2: Prefer appropriate scope
970 *
971 * ret
972 * ^
973 * -1 | d 15
974 * ---+--+-+---> scope
975 * |
976 * | d is scope of the destination.
977 * B-d | \
978 * | \ <- smaller scope is better if
979 * B-15 | \ if scope is enough for destinaion.
980 * | ret = B - scope (-1 <= scope >= d <= 15).
981 * d-C-1 | /
982 * |/ <- greater is better
983 * -C / if scope is not enough for destination.
984 * /| ret = scope - C (-1 <= d < scope <= 15).
985 *
986 * d - C - 1 < B -15 (for all -1 <= d <= 15).
987 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
988 * Assume B = 0 and we get C > 29.
989 */
990 ret = __ipv6_addr_src_scope(score->addr_type);
991 if (ret >= dst->scope)
992 ret = -ret;
993 else
994 ret -= 128; /* 30 is enough */
995 score->scopedist = ret;
996 break;
997 case IPV6_SADDR_RULE_PREFERRED:
998 /* Rule 3: Avoid deprecated and optimistic addresses */
999 ret = ipv6_saddr_preferred(score->addr_type) ||
1000 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1001 break;
1002#ifdef CONFIG_IPV6_MIP6
1003 case IPV6_SADDR_RULE_HOA:
7cbca67c 1004 {
a9b05723 1005 /* Rule 4: Prefer home address */
7cbca67c
YH		 1006 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1007 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1008 break;
7cbca67c 1009 }
a9b05723
YH		 1010#endif
1011 case IPV6_SADDR_RULE_OIF:
1012 /* Rule 5: Prefer outgoing interface */
1013 ret = (!dst->ifindex ||
1014 dst->ifindex == score->ifa->idev->dev->ifindex);
1015 break;
1016 case IPV6_SADDR_RULE_LABEL:
1017 /* Rule 6: Prefer matching label */
1018 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1019 score->ifa->idev->dev->ifindex) == dst->label;
1020 break;
1021#ifdef CONFIG_IPV6_PRIVACY
1022 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1023 {
a9b05723
YH		 1024 /* Rule 7: Prefer public address
1025 * Note: prefer temprary address if use_tempaddr >= 2
1026 */
7cbca67c
YH		 1027 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1028 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1029 score->ifa->idev->cnf.use_tempaddr >= 2;
1030 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1031 break;
7cbca67c 1032 }
a9b05723
YH		 1033#endif
1034 case IPV6_SADDR_RULE_ORCHID:
1035 /* Rule 8-: Prefer ORCHID vs ORCHID or
1036 * non-ORCHID vs non-ORCHID
1037 */
1038 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1039 ipv6_addr_orchid(dst->addr));
1040 break;
1041 case IPV6_SADDR_RULE_PREFIX:
1042 /* Rule 8: Use longest matching prefix */
1043 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1044 dst->addr);
1045 break;
1046 default:
1047 ret = 0;
1048 }
1049
1050 if (ret)
1051 __set_bit(i, score->scorebits);
1052 score->rule = i;
1053out:
1054 return ret;
1055}
1056
1057int ipv6_dev_get_saddr(struct net_device *dst_dev,
7cbca67c
YH		 1058 struct in6_addr *daddr, unsigned int prefs,
1059 struct in6_addr *saddr)
1da177e4 1060{
a9b05723
YH		 1061 struct ipv6_saddr_score scores[2],
1062 *score = &scores[0], *hiscore = &scores[1];
c346dca1 1063 struct net *net = dev_net(dst_dev);
a9b05723 1064 struct ipv6_saddr_dst dst;
072047e4 1065 struct net_device *dev;
a9b05723 1066 int dst_type;
1da177e4 1067
a9b05723
YH		 1068 dst_type = __ipv6_addr_type(daddr);
1069 dst.addr = daddr;
1070 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1071 dst.scope = __ipv6_addr_src_scope(dst_type);
1072 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
7cbca67c 1073 dst.prefs = prefs;
a9b05723
YH		 1074
1075 hiscore->rule = -1;
1076 hiscore->ifa = NULL;
1da177e4 1077
072047e4 1078 read_lock(&dev_base_lock);
8814c4b5 1079 rcu_read_lock();
1da177e4 1080
6fda7350 1081 for_each_netdev(net, dev) {
072047e4 1082 struct inet6_dev *idev;
072047e4 1083
a9b05723 1084 /* Candidate Source Address (section 4)
072047e4
YH		 1085 * - multicast and link-local destination address,
1086 * the set of candidate source address MUST only
1087 * include addresses assigned to interfaces
1088 * belonging to the same link as the outgoing
1089 * interface.
1090 * (- For site-local destination addresses, the
1091 * set of candidate source addresses MUST only
1092 * include addresses assigned to interfaces
1093 * belonging to the same site as the outgoing
1094 * interface.)
1095 */
a9b05723
YH		 1096 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1097 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1098 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1099 continue;
1da177e4 1100
1da177e4 1101 idev = __in6_dev_get(dev);
072047e4
YH		 1102 if (!idev)
1103 continue;
1104
1105 read_lock_bh(&idev->lock);
a9b05723
YH		 1106 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1107 int i;
072047e4 1108
a9b05723 1109 /*
6b3ae80a
YH		 1110 * - Tentative Address (RFC2462 section 5.4)
1111 * - A tentative address is not considered
1112 * "assigned to an interface" in the traditional
95c385b4 1113 * sense, unless it is also flagged as optimistic.
6b3ae80a 1114 * - Candidate Source Address (section 4)
072047e4
YH		 1115 * - In any case, anycast addresses, multicast
1116 * addresses, and the unspecified address MUST
1117 * NOT be included in a candidate set.
1118 */
a9b05723
YH		 1119 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1120 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1121 continue;
a9b05723
YH		 1122
1123 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1124
1125 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1126 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1127 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1128 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1129 "assigned as unicast address on %s",
1130 dev->name);
1131 continue;
1132 }
1133
a9b05723
YH		 1134 score->rule = -1;
1135 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1136
1137 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1138 int minihiscore, miniscore;
1139
1140 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1141 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1142
1143 if (minihiscore > miniscore) {
1144 if (i == IPV6_SADDR_RULE_SCOPE &&
1145 score->scopedist > 0) {
1146 /*
1147 * special case:
1148 * each remaining entry
1149 * has too small (not enough)
1150 * scope, because ifa entries
1151 * are sorted by their scope
1152 * values.
1153 */
1154 goto try_nextdev;
1155 }
1156 break;
1157 } else if (minihiscore < miniscore) {
1158 struct ipv6_saddr_score *tmp;
1159
1160 if (hiscore->ifa)
1161 in6_ifa_put(hiscore->ifa);
1162
1163 in6_ifa_hold(score->ifa);
1164
1165 tmp = hiscore;
1166 hiscore = score;
1167 score = tmp;
1168
1169 /* restore our iterator */
1170 score->ifa = hiscore->ifa;
1171
1172 break;
1da177e4 1173 }
072047e4 1174 }
1da177e4 1175 }
a9b05723 1176try_nextdev:
072047e4 1177 read_unlock_bh(&idev->lock);
1da177e4 1178 }
8814c4b5 1179 rcu_read_unlock();
1da177e4
LT		 1180 read_unlock(&dev_base_lock);
1181
a9b05723 1182 if (!hiscore->ifa)
072047e4 1183 return -EADDRNOTAVAIL;
1ab1457c 1184
a9b05723
YH		 1185 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1186 in6_ifa_put(hiscore->ifa);
072047e4 1187 return 0;
1da177e4
LT		 1188}
1189
5e5f3f0f 1190EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1191
95c385b4
NH		 1192int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1193 unsigned char banned_flags)
1da177e4
LT		 1194{
1195 struct inet6_dev *idev;
1196 int err = -EADDRNOTAVAIL;
1197
8814c4b5 1198 rcu_read_lock();
1da177e4
LT		 1199 if ((idev = __in6_dev_get(dev)) != NULL) {
1200 struct inet6_ifaddr *ifp;
1201
1202 read_lock_bh(&idev->lock);
1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1204 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1205 ipv6_addr_copy(addr, &ifp->addr);
1206 err = 0;
1207 break;
1208 }
1209 }
1210 read_unlock_bh(&idev->lock);
1211 }
8814c4b5 1212 rcu_read_unlock();
1da177e4
LT		 1213 return err;
1214}
1215
1216static int ipv6_count_addresses(struct inet6_dev *idev)
1217{
1218 int cnt = 0;
1219 struct inet6_ifaddr *ifp;
1220
1221 read_lock_bh(&idev->lock);
1222 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1223 cnt++;
1224 read_unlock_bh(&idev->lock);
1225 return cnt;
1226}
1227
bfeade08
DL		 1228int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1229 struct net_device *dev, int strict)
1da177e4
LT		 1230{
1231 struct inet6_ifaddr * ifp;
1232 u8 hash = ipv6_addr_hash(addr);
1233
1234 read_lock_bh(&addrconf_hash_lock);
1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1236 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1237 continue;
1da177e4
LT		 1238 if (ipv6_addr_equal(&ifp->addr, addr) &&
1239 !(ifp->flags&IFA_F_TENTATIVE)) {
1240 if (dev == NULL || ifp->idev->dev == dev ||
1241 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1242 break;
1243 }
1244 }
1245 read_unlock_bh(&addrconf_hash_lock);
1246 return ifp != NULL;
1247}
7159039a
YH		 1248EXPORT_SYMBOL(ipv6_chk_addr);
1249
1da177e4 1250static
06bfe655
DL		 1251int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1252 struct net_device *dev)
1da177e4
LT		 1253{
1254 struct inet6_ifaddr * ifp;
1255 u8 hash = ipv6_addr_hash(addr);
1256
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1258 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1259 continue;
1da177e4
LT		 1260 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 if (dev == NULL || ifp->idev->dev == dev)
1262 break;
1263 }
1264 }
1265 return ifp != NULL;
1266}
1267
52eeeb84
YH		 1268int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1269{
1270 struct inet6_dev *idev;
1271 struct inet6_ifaddr *ifa;
1272 int onlink;
1273
1274 onlink = 0;
1275 rcu_read_lock();
1276 idev = __in6_dev_get(dev);
1277 if (idev) {
1278 read_lock_bh(&idev->lock);
1279 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1280 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1281 ifa->prefix_len);
1282 if (onlink)
1283 break;
1284 }
1285 read_unlock_bh(&idev->lock);
1286 }
1287 rcu_read_unlock();
1288 return onlink;
1289}
1290
1291EXPORT_SYMBOL(ipv6_chk_prefix);
1292
1cab3da6
DL		 1293struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1294 struct net_device *dev, int strict)
1da177e4
LT		 1295{
1296 struct inet6_ifaddr * ifp;
1297 u8 hash = ipv6_addr_hash(addr);
1298
1299 read_lock_bh(&addrconf_hash_lock);
1300 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1301 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1302 continue;
1da177e4
LT		 1303 if (ipv6_addr_equal(&ifp->addr, addr)) {
1304 if (dev == NULL || ifp->idev->dev == dev ||
1305 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1306 in6_ifa_hold(ifp);
1307 break;
1308 }
1309 }
1310 }
1311 read_unlock_bh(&addrconf_hash_lock);
1312
1313 return ifp;
1314}
1315
1316int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1317{
1318 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1319 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1320 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1321 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1322 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1323 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1324 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1325 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1326
1327 if (!sk2_rcv_saddr && !sk_ipv6only)
1328 return 1;
1329
1330 if (addr_type2 == IPV6_ADDR_ANY &&
1331 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1332 return 1;
1333
1334 if (addr_type == IPV6_ADDR_ANY &&
1335 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1336 return 1;
1337
1338 if (sk2_rcv_saddr6 &&
1339 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1340 return 1;
1341
1342 if (addr_type == IPV6_ADDR_MAPPED &&
1343 !sk2_ipv6only &&
1344 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1345 return 1;
1346
1347 return 0;
1348}
1349
1350/* Gets referenced address, destroys ifaddr */
1351
9f5336e2 1352static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1353{
1da177e4
LT		 1354 if (ifp->flags&IFA_F_PERMANENT) {
1355 spin_lock_bh(&ifp->lock);
1356 addrconf_del_timer(ifp);
1357 ifp->flags |= IFA_F_TENTATIVE;
1358 spin_unlock_bh(&ifp->lock);
1359 in6_ifa_put(ifp);
1360#ifdef CONFIG_IPV6_PRIVACY
1361 } else if (ifp->flags&IFA_F_TEMPORARY) {
1362 struct inet6_ifaddr *ifpub;
1363 spin_lock_bh(&ifp->lock);
1364 ifpub = ifp->ifpub;
1365 if (ifpub) {
1366 in6_ifa_hold(ifpub);
1367 spin_unlock_bh(&ifp->lock);
1368 ipv6_create_tempaddr(ifpub, ifp);
1369 in6_ifa_put(ifpub);
1370 } else {
1371 spin_unlock_bh(&ifp->lock);
1372 }
1373 ipv6_del_addr(ifp);
1374#endif
1375 } else
1376 ipv6_del_addr(ifp);
1377}
1378
3c21edbd
YH		 1379void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1380{
1381 if (net_ratelimit())
1382 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1383 addrconf_dad_stop(ifp);
1384}
1da177e4
LT		 1385
1386/* Join to solicited addr multicast group. */
1387
1388void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1389{
1390 struct in6_addr maddr;
1391
1392 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1393 return;
1394
1395 addrconf_addr_solict_mult(addr, &maddr);
1396 ipv6_dev_mc_inc(dev, &maddr);
1397}
1398
1399void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1400{
1401 struct in6_addr maddr;
1402
1403 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1404 return;
1405
1406 addrconf_addr_solict_mult(addr, &maddr);
1407 __ipv6_dev_mc_dec(idev, &maddr);
1408}
1409
20380731 1410static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1411{
1412 struct in6_addr addr;
1413 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1414 if (ipv6_addr_any(&addr))
1415 return;
1416 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1417}
1418
20380731 1419static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1420{
1421 struct in6_addr addr;
1422 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1423 if (ipv6_addr_any(&addr))
1424 return;
1425 __ipv6_dev_ac_dec(ifp->idev, &addr);
1426}
1427
073a8e0e
YH		 1428static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1429{
1430 if (dev->addr_len != ETH_ALEN)
1431 return -1;
1432 memcpy(eui, dev->dev_addr, 3);
1433 memcpy(eui + 5, dev->dev_addr + 3, 3);
1434
1435 /*
1436 * The zSeries OSA network cards can be shared among various
1437 * OS instances, but the OSA cards have only one MAC address.
1438 * This leads to duplicate address conflicts in conjunction
1439 * with IPv6 if more than one instance uses the same card.
1440 *
1441 * The driver for these cards can deliver a unique 16-bit
1442 * identifier for each instance sharing the same card. It is
1443 * placed instead of 0xFFFE in the interface identifier. The
1444 * "u" bit of the interface identifier is not inverted in this
1445 * case. Hence the resulting interface identifier has local
1446 * scope according to RFC2373.
1447 */
1448 if (dev->dev_id) {
1449 eui[3] = (dev->dev_id >> 8) & 0xFF;
1450 eui[4] = dev->dev_id & 0xFF;
1451 } else {
1452 eui[3] = 0xFF;
1453 eui[4] = 0xFE;
1454 eui[0] ^= 2;
1455 }
1456 return 0;
1457}
1458
1459static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1460{
1461 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1462 if (dev->addr_len != ARCNET_ALEN)
1463 return -1;
1464 memset(eui, 0, 7);
1465 eui[7] = *(u8*)dev->dev_addr;
1466 return 0;
1467}
1468
1469static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1470{
1471 if (dev->addr_len != INFINIBAND_ALEN)
1472 return -1;
1473 memcpy(eui, dev->dev_addr + 12, 8);
1474 eui[0] |= 2;
1475 return 0;
1476}
1477
1da177e4
LT		 1478static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1479{
1480 switch (dev->type) {
1481 case ARPHRD_ETHER:
1482 case ARPHRD_FDDI:
1483 case ARPHRD_IEEE802_TR:
073a8e0e 1484 return addrconf_ifid_eui48(eui, dev);
1da177e4 1485 case ARPHRD_ARCNET:
073a8e0e 1486 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1487 case ARPHRD_INFINIBAND:
073a8e0e 1488 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1489 case ARPHRD_SIT:
1490 if (dev->priv_flags & IFF_ISATAP)
1491 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1492 }
1493 return -1;
1494}
1495
1496static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1497{
1498 int err = -1;
1499 struct inet6_ifaddr *ifp;
1500
1501 read_lock_bh(&idev->lock);
1502 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1503 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1504 memcpy(eui, ifp->addr.s6_addr+8, 8);
1505 err = 0;
1506 break;
1507 }
1508 }
1509 read_unlock_bh(&idev->lock);
1510 return err;
1511}
1512
1513#ifdef CONFIG_IPV6_PRIVACY
1514/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1515static int __ipv6_regen_rndid(struct inet6_dev *idev)
1516{
1da177e4 1517regen:
955189ef 1518 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1519 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1520
1521 /*
1522 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1523 * check if generated address is not inappropriate
1524 *
1525 * - Reserved subnet anycast (RFC 2526)
1526 * 11111101 11....11 1xxxxxxx
c7dc89c0 1527 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1528 * 00-00-5E-FE-xx-xx-xx-xx
1529 * - value 0
1530 * - XXX: already assigned to an address on the device
1531 */
1ab1457c 1532 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1533 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1534 (idev->rndid[7]&0x80))
1535 goto regen;
1536 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1537 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1538 goto regen;
1539 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1540 goto regen;
1541 }
1542
1543 return 0;
1544}
1545
1546static void ipv6_regen_rndid(unsigned long data)
1547{
1548 struct inet6_dev *idev = (struct inet6_dev *) data;
1549 unsigned long expires;
1550
8814c4b5 1551 rcu_read_lock_bh();
1da177e4
LT		 1552 write_lock_bh(&idev->lock);
1553
1554 if (idev->dead)
1555 goto out;
1556
1557 if (__ipv6_regen_rndid(idev) < 0)
1558 goto out;
1ab1457c 1559
1da177e4 1560 expires = jiffies +
1ab1457c 1561 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1562 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1563 if (time_before(expires, jiffies)) {
1564 printk(KERN_WARNING
1565 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1566 idev->dev->name);
1567 goto out;
1568 }
1569
1570 if (!mod_timer(&idev->regen_timer, expires))
1571 in6_dev_hold(idev);
1572
1573out:
1574 write_unlock_bh(&idev->lock);
8814c4b5 1575 rcu_read_unlock_bh();
1da177e4
LT		 1576 in6_dev_put(idev);
1577}
1578
1579static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1580 int ret = 0;
1581
1582 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1583 ret = __ipv6_regen_rndid(idev);
1584 return ret;
1585}
1586#endif
1587
1588/*
1589 * Add prefix route.
1590 */
1591
1592static void
1593addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1594 unsigned long expires, u32 flags)
1da177e4 1595{
86872cb5
TG		 1596 struct fib6_config cfg = {
1597 .fc_table = RT6_TABLE_PREFIX,
1598 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1599 .fc_ifindex = dev->ifindex,
1600 .fc_expires = expires,
1601 .fc_dst_len = plen,
1602 .fc_flags = RTF_UP | flags,
c346dca1 1603 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1604 };
1da177e4 1605
86872cb5 1606 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1607
1608 /* Prevent useless cloning on PtP SIT.
1609 This thing is done here expecting that the whole
1610 class of non-broadcast devices need not cloning.
1611 */
0be669bb 1612#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1613 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1614 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1615#endif
1da177e4 1616
86872cb5 1617 ip6_route_add(&cfg);
1da177e4
LT		 1618}
1619
1620/* Create "default" multicast route to the interface */
1621
1622static void addrconf_add_mroute(struct net_device *dev)
1623{
86872cb5
TG		 1624 struct fib6_config cfg = {
1625 .fc_table = RT6_TABLE_LOCAL,
1626 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1627 .fc_ifindex = dev->ifindex,
1628 .fc_dst_len = 8,
1629 .fc_flags = RTF_UP,
c346dca1 1630 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1631 };
1632
1633 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1634
1635 ip6_route_add(&cfg);
1da177e4
LT		 1636}
1637
0be669bb 1638#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1639static void sit_route_add(struct net_device *dev)
1640{
86872cb5
TG		 1641 struct fib6_config cfg = {
1642 .fc_table = RT6_TABLE_MAIN,
1643 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1644 .fc_ifindex = dev->ifindex,
1645 .fc_dst_len = 96,
1646 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1647 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1648 };
1da177e4
LT		 1649
1650 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1651 ip6_route_add(&cfg);
1da177e4 1652}
0be669bb 1653#endif
1da177e4
LT		 1654
1655static void addrconf_add_lroute(struct net_device *dev)
1656{
1657 struct in6_addr addr;
1658
1659 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1660 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1661}
1662
1663static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1664{
1665 struct inet6_dev *idev;
1666
1667 ASSERT_RTNL();
1668
1669 if ((idev = ipv6_find_idev(dev)) == NULL)
1670 return NULL;
1671
1672 /* Add default multicast route */
1673 addrconf_add_mroute(dev);
1674
1675 /* Add link local route */
1676 addrconf_add_lroute(dev);
1677 return idev;
1678}
1679
1680void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1681{
1682 struct prefix_info *pinfo;
1683 __u32 valid_lft;
1684 __u32 prefered_lft;
1685 int addr_type;
1686 unsigned long rt_expires;
1687 struct inet6_dev *in6_dev;
1688
1689 pinfo = (struct prefix_info *) opt;
1ab1457c 1690
1da177e4
LT		 1691 if (len < sizeof(struct prefix_info)) {
1692 ADBG(("addrconf: prefix option too short\n"));
1693 return;
1694 }
1ab1457c 1695
1da177e4
LT		 1696 /*
1697 * Validation checks ([ADDRCONF], page 19)
1698 */
1699
1700 addr_type = ipv6_addr_type(&pinfo->prefix);
1701
1702 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1703 return;
1704
1705 valid_lft = ntohl(pinfo->valid);
1706 prefered_lft = ntohl(pinfo->prefered);
1707
1708 if (prefered_lft > valid_lft) {
1709 if (net_ratelimit())
1710 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1711 return;
1712 }
1713
1714 in6_dev = in6_dev_get(dev);
1715
1716 if (in6_dev == NULL) {
1717 if (net_ratelimit())
1718 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1719 return;
1720 }
1721
1722 /*
1723 * Two things going on here:
1724 * 1) Add routes for on-link prefixes
1725 * 2) Configure prefixes with the auto flag set
1726 */
1727
1728 /* Avoid arithmetic overflow. Really, we could
1729 save rt_expires in seconds, likely valid_lft,
1730 but it would require division in fib gc, that it
1731 not good.
1732 */
1733 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1734 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1735 else
3dd4bc68
YH		 1736 rt_expires = valid_lft * HZ;
1737
1738 /*
1739 * We convert this (in jiffies) to clock_t later.
1740 * Avoid arithmetic overflow there as well.
1741 * Overflow can happen only if HZ < USER_HZ.
1742 */
1743 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1744 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1745
1746 if (pinfo->onlink) {
1747 struct rt6_info *rt;
c346dca1 1748 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1749 dev->ifindex, 1);
1da177e4
LT		 1750
1751 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1752 if (rt->rt6i_flags&RTF_EXPIRES) {
1753 if (valid_lft == 0) {
e0a1ad73 1754 ip6_del_rt(rt);
1da177e4
LT		 1755 rt = NULL;
1756 } else {
3dd4bc68 1757 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1758 }
1759 }
1760 } else if (valid_lft) {
1761 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1762 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1763 }
1764 if (rt)
1765 dst_release(&rt->u.dst);
1766 }
1767
1768 /* Try to figure out our local address for this prefix */
1769
1770 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1771 struct inet6_ifaddr * ifp;
1772 struct in6_addr addr;
1773 int create = 0, update_lft = 0;
1774
1775 if (pinfo->prefix_len == 64) {
1776 memcpy(&addr, &pinfo->prefix, 8);
1777 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1778 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1779 in6_dev_put(in6_dev);
1780 return;
1781 }
1782 goto ok;
1783 }
1784 if (net_ratelimit())
1785 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1786 pinfo->prefix_len);
1787 in6_dev_put(in6_dev);
1788 return;
1789
1790ok:
1791
c346dca1 1792 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1da177e4
LT		 1793
1794 if (ifp == NULL && valid_lft) {
1795 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1796 u32 addr_flags = 0;
1797
1798#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1799 if (in6_dev->cnf.optimistic_dad &&
1800 !ipv6_devconf.forwarding)
1801 addr_flags = IFA_F_OPTIMISTIC;
1802#endif
1da177e4
LT		 1803
1804 /* Do not allow to create too much of autoconfigured
1805 * addresses; this would be too easy way to crash kernel.
1806 */
1807 if (!max_addresses ||
1808 ipv6_count_addresses(in6_dev) < max_addresses)
1809 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1810 addr_type&IPV6_ADDR_SCOPE_MASK,
1811 addr_flags);
1da177e4
LT		 1812
1813 if (!ifp || IS_ERR(ifp)) {
1814 in6_dev_put(in6_dev);
1815 return;
1816 }
1817
1818 update_lft = create = 1;
1819 ifp->cstamp = jiffies;
1820 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1821 }
1822
1823 if (ifp) {
1824 int flags;
1825 unsigned long now;
1826#ifdef CONFIG_IPV6_PRIVACY
1827 struct inet6_ifaddr *ift;
1828#endif
1829 u32 stored_lft;
1830
1831 /* update lifetime (RFC2462 5.5.3 e) */
1832 spin_lock(&ifp->lock);
1833 now = jiffies;
1834 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1835 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1836 else
1837 stored_lft = 0;
1838 if (!update_lft && stored_lft) {
1839 if (valid_lft > MIN_VALID_LIFETIME ||
1840 valid_lft > stored_lft)
1841 update_lft = 1;
1842 else if (stored_lft <= MIN_VALID_LIFETIME) {
1843 /* valid_lft <= stored_lft is always true */
1844 /* XXX: IPsec */
1845 update_lft = 0;
1846 } else {
1847 valid_lft = MIN_VALID_LIFETIME;
1848 if (valid_lft < prefered_lft)
1849 prefered_lft = valid_lft;
1850 update_lft = 1;
1851 }
1852 }
1853
1854 if (update_lft) {
1855 ifp->valid_lft = valid_lft;
1856 ifp->prefered_lft = prefered_lft;
1857 ifp->tstamp = now;
1858 flags = ifp->flags;
1859 ifp->flags &= ~IFA_F_DEPRECATED;
1860 spin_unlock(&ifp->lock);
1861
1862 if (!(flags&IFA_F_TENTATIVE))
1863 ipv6_ifa_notify(0, ifp);
1864 } else
1865 spin_unlock(&ifp->lock);
1866
1867#ifdef CONFIG_IPV6_PRIVACY
1868 read_lock_bh(&in6_dev->lock);
1869 /* update all temporary addresses in the list */
1870 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1871 /*
1872 * When adjusting the lifetimes of an existing
1873 * temporary address, only lower the lifetimes.
1874 * Implementations must not increase the
1875 * lifetimes of an existing temporary address
1876 * when processing a Prefix Information Option.
1877 */
c6fbfac2
BB		 1878 if (ifp != ift->ifpub)
1879 continue;
1880
1da177e4
LT		 1881 spin_lock(&ift->lock);
1882 flags = ift->flags;
1883 if (ift->valid_lft > valid_lft &&
1884 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1885 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1886 if (ift->prefered_lft > prefered_lft &&
1887 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1888 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1889 spin_unlock(&ift->lock);
1890 if (!(flags&IFA_F_TENTATIVE))
1891 ipv6_ifa_notify(0, ift);
1892 }
1893
1894 if (create && in6_dev->cnf.use_tempaddr > 0) {
1895 /*
1896 * When a new public address is created as described in [ADDRCONF],
1897 * also create a new temporary address.
1898 */
1ab1457c 1899 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1900 ipv6_create_tempaddr(ifp, NULL);
1901 } else {
1902 read_unlock_bh(&in6_dev->lock);
1903 }
1904#endif
1905 in6_ifa_put(ifp);
1906 addrconf_verify(0);
1907 }
1908 }
1909 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1910 in6_dev_put(in6_dev);
1911}
1912
1913/*
1914 * Set destination address.
1915 * Special case for SIT interfaces where we create a new "virtual"
1916 * device.
1917 */
af284937 1918int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 1919{
1920 struct in6_ifreq ireq;
1921 struct net_device *dev;
1922 int err = -EINVAL;
1923
1924 rtnl_lock();
1925
1926 err = -EFAULT;
1927 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1928 goto err_exit;
1929
af284937 1930 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 1931
1932 err = -ENODEV;
1933 if (dev == NULL)
1934 goto err_exit;
1935
0be669bb 1936#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1937 if (dev->type == ARPHRD_SIT) {
1938 struct ifreq ifr;
1939 mm_segment_t oldfs;
1940 struct ip_tunnel_parm p;
1941
1942 err = -EADDRNOTAVAIL;
1943 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1944 goto err_exit;
1945
1946 memset(&p, 0, sizeof(p));
1947 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1948 p.iph.saddr = 0;
1949 p.iph.version = 4;
1950 p.iph.ihl = 5;
1951 p.iph.protocol = IPPROTO_IPV6;
1952 p.iph.ttl = 64;
d20b3109 1953 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1954
1955 oldfs = get_fs(); set_fs(KERNEL_DS);
1956 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1957 set_fs(oldfs);
1958
1959 if (err == 0) {
1960 err = -ENOBUFS;
af284937
DL		 1961 dev = __dev_get_by_name(net, p.name);
1962 if (!dev)
1da177e4
LT		 1963 goto err_exit;
1964 err = dev_open(dev);
1965 }
1966 }
0be669bb 1967#endif
1da177e4
LT		 1968
1969err_exit:
1970 rtnl_unlock();
1971 return err;
1972}
1973
1974/*
1975 * Manual configuration of address on an interface
1976 */
af284937
DL		 1977static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1978 int plen, __u8 ifa_flags, __u32 prefered_lft,
1979 __u32 valid_lft)
1da177e4
LT		 1980{
1981 struct inet6_ifaddr *ifp;
1982 struct inet6_dev *idev;
1983 struct net_device *dev;
1984 int scope;
46d48046 1985 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1986
1987 ASSERT_RTNL();
1ab1457c 1988
0778769d
NT		 1989 /* check the lifetime */
1990 if (!valid_lft || prefered_lft > valid_lft)
1991 return -EINVAL;
1992
af284937
DL		 1993 dev = __dev_get_by_index(net, ifindex);
1994 if (!dev)
1da177e4 1995 return -ENODEV;
1ab1457c 1996
1da177e4
LT		 1997 if ((idev = addrconf_add_dev(dev)) == NULL)
1998 return -ENOBUFS;
1999
2000 scope = ipv6_addr_scope(pfx);
2001
46d48046 2002 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 2003 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 2004 flags = 0;
2005 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 2006 valid_lft = 0x7FFFFFFF/HZ;
2007
2008 if (prefered_lft == 0)
2009 ifa_flags |= IFA_F_DEPRECATED;
2010 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2011 (prefered_lft != INFINITY_LIFE_TIME))
2012 prefered_lft = 0x7FFFFFFF/HZ;
2013
2014 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2015
1da177e4 2016 if (!IS_ERR(ifp)) {
06aebfb7 2017 spin_lock_bh(&ifp->lock);
0778769d
NT		 2018 ifp->valid_lft = valid_lft;
2019 ifp->prefered_lft = prefered_lft;
2020 ifp->tstamp = jiffies;
06aebfb7 2021 spin_unlock_bh(&ifp->lock);
0778769d 2022
46d48046
YH		 2023 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2024 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 2025 /*
2026 * Note that section 3.1 of RFC 4429 indicates
2027 * that the Optimistic flag should not be set for
2028 * manually configured addresses
2029 */
1da177e4
LT		 2030 addrconf_dad_start(ifp, 0);
2031 in6_ifa_put(ifp);
0778769d 2032 addrconf_verify(0);
1da177e4
LT		 2033 return 0;
2034 }
2035
2036 return PTR_ERR(ifp);
2037}
2038
af284937
DL		 2039static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2040 int plen)
1da177e4
LT		 2041{
2042 struct inet6_ifaddr *ifp;
2043 struct inet6_dev *idev;
2044 struct net_device *dev;
1ab1457c 2045
af284937
DL		 2046 dev = __dev_get_by_index(net, ifindex);
2047 if (!dev)
1da177e4
LT		 2048 return -ENODEV;
2049
2050 if ((idev = __in6_dev_get(dev)) == NULL)
2051 return -ENXIO;
2052
2053 read_lock_bh(&idev->lock);
2054 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2055 if (ifp->prefix_len == plen &&
2056 ipv6_addr_equal(pfx, &ifp->addr)) {
2057 in6_ifa_hold(ifp);
2058 read_unlock_bh(&idev->lock);
1ab1457c 2059
1da177e4
LT		 2060 ipv6_del_addr(ifp);
2061
2062 /* If the last address is deleted administratively,
2063 disable IPv6 on this interface.
2064 */
2065 if (idev->addr_list == NULL)
2066 addrconf_ifdown(idev->dev, 1);
2067 return 0;
2068 }
2069 }
2070 read_unlock_bh(&idev->lock);
2071 return -EADDRNOTAVAIL;
2072}
2073
2074
af284937 2075int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2076{
2077 struct in6_ifreq ireq;
2078 int err;
1ab1457c 2079
1da177e4
LT		 2080 if (!capable(CAP_NET_ADMIN))
2081 return -EPERM;
1ab1457c 2082
1da177e4
LT		 2083 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2084 return -EFAULT;
2085
2086 rtnl_lock();
af284937
DL		 2087 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2088 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2089 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2090 rtnl_unlock();
2091 return err;
2092}
2093
af284937 2094int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2095{
2096 struct in6_ifreq ireq;
2097 int err;
1ab1457c 2098
1da177e4
LT		 2099 if (!capable(CAP_NET_ADMIN))
2100 return -EPERM;
2101
2102 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2103 return -EFAULT;
2104
2105 rtnl_lock();
af284937
DL		 2106 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2107 ireq.ifr6_prefixlen);
1da177e4
LT		 2108 rtnl_unlock();
2109 return err;
2110}
2111
0be669bb 2112#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2113static void sit_add_v4_addrs(struct inet6_dev *idev)
2114{
2115 struct inet6_ifaddr * ifp;
2116 struct in6_addr addr;
2117 struct net_device *dev;
c346dca1 2118 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2119 int scope;
2120
2121 ASSERT_RTNL();
2122
2123 memset(&addr, 0, sizeof(struct in6_addr));
2124 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2125
2126 if (idev->dev->flags&IFF_POINTOPOINT) {
2127 addr.s6_addr32[0] = htonl(0xfe800000);
2128 scope = IFA_LINK;
2129 } else {
2130 scope = IPV6_ADDR_COMPATv4;
2131 }
2132
2133 if (addr.s6_addr32[3]) {
2134 ifp = ipv6_add_addr(idev, &addr, 128, scope, 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 return;
2143 }
2144
6fda7350 2145 for_each_netdev(net, dev) {
e5ed6399 2146 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2147 if (in_dev && (dev->flags & IFF_UP)) {
2148 struct in_ifaddr * ifa;
2149
2150 int flag = scope;
2151
2152 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2153 int plen;
2154
2155 addr.s6_addr32[3] = ifa->ifa_local;
2156
2157 if (ifa->ifa_scope == RT_SCOPE_LINK)
2158 continue;
2159 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2160 if (idev->dev->flags&IFF_POINTOPOINT)
2161 continue;
2162 flag |= IFA_HOST;
2163 }
2164 if (idev->dev->flags&IFF_POINTOPOINT)
2165 plen = 64;
2166 else
2167 plen = 96;
2168
2169 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2170 IFA_F_PERMANENT);
2171 if (!IS_ERR(ifp)) {
2172 spin_lock_bh(&ifp->lock);
2173 ifp->flags &= ~IFA_F_TENTATIVE;
2174 spin_unlock_bh(&ifp->lock);
2175 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2176 in6_ifa_put(ifp);
2177 }
2178 }
2179 }
1ab1457c 2180 }
1da177e4 2181}
0be669bb 2182#endif
1da177e4
LT		 2183
2184static void init_loopback(struct net_device *dev)
2185{
2186 struct inet6_dev *idev;
2187 struct inet6_ifaddr * ifp;
2188
2189 /* ::1 */
2190
2191 ASSERT_RTNL();
2192
2193 if ((idev = ipv6_find_idev(dev)) == NULL) {
2194 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2195 return;
2196 }
2197
2198 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2199 if (!IS_ERR(ifp)) {
2200 spin_lock_bh(&ifp->lock);
2201 ifp->flags &= ~IFA_F_TENTATIVE;
2202 spin_unlock_bh(&ifp->lock);
2203 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2204 in6_ifa_put(ifp);
2205 }
2206}
2207
2208static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2209{
2210 struct inet6_ifaddr * ifp;
95c385b4
NH		 2211 u32 addr_flags = IFA_F_PERMANENT;
2212
2213#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2214 if (idev->cnf.optimistic_dad &&
2215 !ipv6_devconf.forwarding)
2216 addr_flags |= IFA_F_OPTIMISTIC;
2217#endif
1da177e4 2218
95c385b4
NH		 2219
2220 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2221 if (!IS_ERR(ifp)) {
46d48046 2222 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2223 addrconf_dad_start(ifp, 0);
2224 in6_ifa_put(ifp);
2225 }
2226}
2227
2228static void addrconf_dev_config(struct net_device *dev)
2229{
2230 struct in6_addr addr;
2231 struct inet6_dev * idev;
2232
2233 ASSERT_RTNL();
2234
74235a25
HX		 2235 if ((dev->type != ARPHRD_ETHER) &&
2236 (dev->type != ARPHRD_FDDI) &&
2237 (dev->type != ARPHRD_IEEE802_TR) &&
2238 (dev->type != ARPHRD_ARCNET) &&
2239 (dev->type != ARPHRD_INFINIBAND)) {
2240 /* Alas, we support only Ethernet autoconfiguration. */
2241 return;
2242 }
2243
1da177e4
LT		 2244 idev = addrconf_add_dev(dev);
2245 if (idev == NULL)
2246 return;
2247
2248 memset(&addr, 0, sizeof(struct in6_addr));
2249 addr.s6_addr32[0] = htonl(0xFE800000);
2250
2251 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2252 addrconf_add_linklocal(idev, &addr);
2253}
2254
0be669bb 2255#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2256static void addrconf_sit_config(struct net_device *dev)
2257{
2258 struct inet6_dev *idev;
2259
2260 ASSERT_RTNL();
2261
1ab1457c
YH		 2262 /*
2263 * Configure the tunnel with one of our IPv4
2264 * addresses... we should configure all of
1da177e4
LT		 2265 * our v4 addrs in the tunnel
2266 */
2267
2268 if ((idev = ipv6_find_idev(dev)) == NULL) {
2269 printk(KERN_DEBUG "init sit: add_dev failed\n");
2270 return;
2271 }
2272
c7dc89c0
FT		 2273 if (dev->priv_flags & IFF_ISATAP) {
2274 struct in6_addr addr;
2275
2276 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2277 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2278 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2279 addrconf_add_linklocal(idev, &addr);
2280 return;
2281 }
2282
1da177e4
LT		 2283 sit_add_v4_addrs(idev);
2284
2285 if (dev->flags&IFF_POINTOPOINT) {
2286 addrconf_add_mroute(dev);
2287 addrconf_add_lroute(dev);
2288 } else
2289 sit_route_add(dev);
2290}
0be669bb 2291#endif
1da177e4
LT		 2292
2293static inline int
2294ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2295{
2296 struct in6_addr lladdr;
2297
95c385b4 2298 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2299 addrconf_add_linklocal(idev, &lladdr);
2300 return 0;
2301 }
2302 return -1;
2303}
2304
2305static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2306{
2307 struct net_device *link_dev;
c346dca1 2308 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2309
2310 /* first try to inherit the link-local address from the link device */
2311 if (idev->dev->iflink &&
6fda7350 2312 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2313 if (!ipv6_inherit_linklocal(idev, link_dev))
2314 return;
2315 }
2316 /* then try to inherit it from any device */
6fda7350 2317 for_each_netdev(net, link_dev) {
1da177e4
LT		 2318 if (!ipv6_inherit_linklocal(idev, link_dev))
2319 return;
2320 }
2321 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2322}
2323
2324/*
2325 * Autoconfigure tunnel with a link-local address so routing protocols,
2326 * DHCPv6, MLD etc. can be run over the virtual link
2327 */
2328
2329static void addrconf_ip6_tnl_config(struct net_device *dev)
2330{
2331 struct inet6_dev *idev;
2332
2333 ASSERT_RTNL();
2334
2335 if ((idev = addrconf_add_dev(dev)) == NULL) {
2336 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2337 return;
2338 }
2339 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2340}
2341
1ab1457c 2342static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2343 void * data)
2344{
2345 struct net_device *dev = (struct net_device *) data;
74235a25 2346 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2347 int run_pending = 0;
b217d616 2348 int err;
1da177e4
LT		 2349
2350 switch(event) {
45ba9dd2 2351 case NETDEV_REGISTER:
74235a25 2352 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2353 idev = ipv6_add_dev(dev);
2354 if (!idev)
b217d616 2355 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2356 }
2357 break;
1da177e4 2358 case NETDEV_UP:
3c21edbd 2359 case NETDEV_CHANGE:
c2edacf8
JV		 2360 if (dev->flags & IFF_SLAVE)
2361 break;
2362
3c21edbd 2363 if (event == NETDEV_UP) {
f24e3d65 2364 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2365 /* device is not ready yet. */
2366 printk(KERN_INFO
2367 "ADDRCONF(NETDEV_UP): %s: "
2368 "link is not ready\n",
2369 dev->name);
2370 break;
2371 }
99081049 2372
d31c7b8f
EP		 2373 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2374 idev = ipv6_add_dev(dev);
2375
99081049
KS		 2376 if (idev)
2377 idev->if_flags |= IF_READY;
3c21edbd 2378 } else {
f24e3d65 2379 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2380 /* device is still not ready. */
2381 break;
2382 }
2383
2384 if (idev) {
2385 if (idev->if_flags & IF_READY) {
2386 /* device is already configured. */
2387 break;
2388 }
2389 idev->if_flags |= IF_READY;
2390 }
2391
2392 printk(KERN_INFO
2393 "ADDRCONF(NETDEV_CHANGE): %s: "
2394 "link becomes ready\n",
2395 dev->name);
2396
c5e33bdd 2397 run_pending = 1;
3c21edbd
YH		 2398 }
2399
1da177e4 2400 switch(dev->type) {
0be669bb 2401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2402 case ARPHRD_SIT:
2403 addrconf_sit_config(dev);
2404 break;
0be669bb 2405#endif
1da177e4
LT		 2406 case ARPHRD_TUNNEL6:
2407 addrconf_ip6_tnl_config(dev);
2408 break;
2409 case ARPHRD_LOOPBACK:
2410 init_loopback(dev);
2411 break;
2412
2413 default:
2414 addrconf_dev_config(dev);
2415 break;
3ff50b79 2416 }
1da177e4 2417 if (idev) {
c5e33bdd
YH		 2418 if (run_pending)
2419 addrconf_dad_run(idev);
2420
1da177e4
LT		 2421 /* If the MTU changed during the interface down, when the
2422 interface up, the changed MTU must be reflected in the
2423 idev as well as routers.
2424 */
2425 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2426 rt6_mtu_change(dev, dev->mtu);
2427 idev->cnf.mtu6 = dev->mtu;
2428 }
2429 idev->tstamp = jiffies;
2430 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2431 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2432 stop IPv6 on this interface.
2433 */
2434 if (dev->mtu < IPV6_MIN_MTU)
2435 addrconf_ifdown(dev, event != NETDEV_DOWN);
2436 }
2437 break;
2438
2439 case NETDEV_CHANGEMTU:
d31c7b8f 2440 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2441 rt6_mtu_change(dev, dev->mtu);
2442 idev->cnf.mtu6 = dev->mtu;
2443 break;
2444 }
2445
d31c7b8f
EP		 2446 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2447 idev = ipv6_add_dev(dev);
2448 if (idev)
2449 break;
2450 }
2451
1da177e4
LT		 2452 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2453
2454 case NETDEV_DOWN:
2455 case NETDEV_UNREGISTER:
2456 /*
2457 * Remove all addresses from this interface.
2458 */
2459 addrconf_ifdown(dev, event != NETDEV_DOWN);
2460 break;
3c21edbd 2461
1da177e4 2462 case NETDEV_CHANGENAME:
1da177e4 2463 if (idev) {
5632c515 2464 snmp6_unregister_dev(idev);
408c4768 2465 addrconf_sysctl_unregister(idev);
f52295a9 2466 addrconf_sysctl_register(idev);
b217d616
HX		 2467 err = snmp6_register_dev(idev);
2468 if (err)
2469 return notifier_from_errno(err);
5632c515 2470 }
1da177e4 2471 break;
3ff50b79 2472 }
1da177e4
LT		 2473
2474 return NOTIFY_OK;
2475}
2476
2477/*
2478 * addrconf module should be notified of a device going up
2479 */
2480static struct notifier_block ipv6_dev_notf = {
2481 .notifier_call = addrconf_notify,
2482 .priority = 0
2483};
2484
2485static int addrconf_ifdown(struct net_device *dev, int how)
2486{
2487 struct inet6_dev *idev;
2488 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2489 struct net *net = dev_net(dev);
1da177e4
LT		 2490 int i;
2491
2492 ASSERT_RTNL();
2493
2774c7ab 2494 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2495 how = 0;
2496
f3db4851 2497 rt6_ifdown(net, dev);
1da177e4
LT		 2498 neigh_ifdown(&nd_tbl, dev);
2499
2500 idev = __in6_dev_get(dev);
2501 if (idev == NULL)
2502 return -ENODEV;
2503
2504 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2505 Do not dev_put!
1da177e4
LT		 2506 */
2507 if (how == 1) {
1da177e4 2508 idev->dead = 1;
8814c4b5
YH		 2509
2510 /* protected by rtnl_lock */
2511 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2512
2513 /* Step 1.5: remove snmp6 entry */
2514 snmp6_unregister_dev(idev);
2515
2516 }
2517
2518 /* Step 2: clear hash table */
2519 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2520 bifa = &inet6_addr_lst[i];
2521
2522 write_lock_bh(&addrconf_hash_lock);
2523 while ((ifa = *bifa) != NULL) {
2524 if (ifa->idev == idev) {
2525 *bifa = ifa->lst_next;
2526 ifa->lst_next = NULL;
2527 addrconf_del_timer(ifa);
2528 in6_ifa_put(ifa);
2529 continue;
2530 }
2531 bifa = &ifa->lst_next;
2532 }
2533 write_unlock_bh(&addrconf_hash_lock);
2534 }
2535
2536 write_lock_bh(&idev->lock);
2537
2538 /* Step 3: clear flags for stateless addrconf */
2539 if (how != 1)
3c21edbd 2540 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2541
2542 /* Step 4: clear address list */
2543#ifdef CONFIG_IPV6_PRIVACY
2544 if (how == 1 && del_timer(&idev->regen_timer))
2545 in6_dev_put(idev);
2546
2547 /* clear tempaddr list */
2548 while ((ifa = idev->tempaddr_list) != NULL) {
2549 idev->tempaddr_list = ifa->tmp_next;
2550 ifa->tmp_next = NULL;
2551 ifa->dead = 1;
2552 write_unlock_bh(&idev->lock);
2553 spin_lock_bh(&ifa->lock);
2554
2555 if (ifa->ifpub) {
2556 in6_ifa_put(ifa->ifpub);
2557 ifa->ifpub = NULL;
2558 }
2559 spin_unlock_bh(&ifa->lock);
2560 in6_ifa_put(ifa);
2561 write_lock_bh(&idev->lock);
2562 }
2563#endif
2564 while ((ifa = idev->addr_list) != NULL) {
2565 idev->addr_list = ifa->if_next;
2566 ifa->if_next = NULL;
2567 ifa->dead = 1;
2568 addrconf_del_timer(ifa);
2569 write_unlock_bh(&idev->lock);
2570
2571 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2572 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2573 in6_ifa_put(ifa);
2574
2575 write_lock_bh(&idev->lock);
2576 }
2577 write_unlock_bh(&idev->lock);
2578
2579 /* Step 5: Discard multicast list */
2580
2581 if (how == 1)
2582 ipv6_mc_destroy_dev(idev);
2583 else
2584 ipv6_mc_down(idev);
2585
1da177e4 2586 idev->tstamp = jiffies;
1ab1457c 2587
1da177e4
LT		 2588 /* Shot the device (if unregistered) */
2589
2590 if (how == 1) {
408c4768 2591 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2592 neigh_parms_release(&nd_tbl, idev->nd_parms);
2593 neigh_ifdown(&nd_tbl, dev);
2594 in6_dev_put(idev);
2595 }
2596 return 0;
2597}
2598
2599static void addrconf_rs_timer(unsigned long data)
2600{
2601 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2602
2603 if (ifp->idev->cnf.forwarding)
2604 goto out;
2605
2606 if (ifp->idev->if_flags & IF_RA_RCVD) {
2607 /*
2608 * Announcement received after solicitation
2609 * was sent
2610 */
2611 goto out;
2612 }
2613
2614 spin_lock(&ifp->lock);
2615 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2616 struct in6_addr all_routers;
2617
2618 /* The wait after the last probe can be shorter */
2619 addrconf_mod_timer(ifp, AC_RS,
2620 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2621 ifp->idev->cnf.rtr_solicit_delay :
2622 ifp->idev->cnf.rtr_solicit_interval);
2623 spin_unlock(&ifp->lock);
2624
2625 ipv6_addr_all_routers(&all_routers);
2626
2627 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2628 } else {
2629 spin_unlock(&ifp->lock);
2630 /*
2631 * Note: we do not support deprecated "all on-link"
2632 * assumption any longer.
2633 */
2634 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2635 ifp->idev->dev->name);
2636 }
2637
2638out:
2639 in6_ifa_put(ifp);
2640}
2641
2642/*
2643 * Duplicate Address Detection
2644 */
3c21edbd
YH		 2645static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2646{
2647 unsigned long rand_num;
2648 struct inet6_dev *idev = ifp->idev;
2649
95c385b4
NH		 2650 if (ifp->flags & IFA_F_OPTIMISTIC)
2651 rand_num = 0;
2652 else
2653 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2654
3c21edbd
YH		 2655 ifp->probes = idev->cnf.dad_transmits;
2656 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2657}
2658
e431b8c0 2659static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2660{
2661 struct inet6_dev *idev = ifp->idev;
2662 struct net_device *dev = idev->dev;
1da177e4
LT		 2663
2664 addrconf_join_solict(dev, &ifp->addr);
2665
1da177e4 2666 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2667
2668 read_lock_bh(&idev->lock);
2669 if (ifp->dead)
2670 goto out;
2671 spin_lock_bh(&ifp->lock);
2672
2673 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2674 !(ifp->flags&IFA_F_TENTATIVE) ||
2675 ifp->flags & IFA_F_NODAD) {
95c385b4 2676 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2677 spin_unlock_bh(&ifp->lock);
2678 read_unlock_bh(&idev->lock);
2679
2680 addrconf_dad_completed(ifp);
2681 return;
2682 }
2683
6732bade 2684 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2685 spin_unlock_bh(&ifp->lock);
6732bade 2686 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2687 /*
2688 * If the defice is not ready:
2689 * - keep it tentative if it is a permanent address.
2690 * - otherwise, kill it.
2691 */
2692 in6_ifa_hold(ifp);
2693 addrconf_dad_stop(ifp);
6732bade 2694 return;
3c21edbd 2695 }
95c385b4
NH		 2696
2697 /*
2698 * Optimistic nodes can start receiving
2699 * Frames right away
2700 */
2701 if(ifp->flags & IFA_F_OPTIMISTIC)
2702 ip6_ins_rt(ifp->rt);
2703
6732bade
YH		 2704 addrconf_dad_kick(ifp);
2705 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2706out:
2707 read_unlock_bh(&idev->lock);
2708}
2709
2710static void addrconf_dad_timer(unsigned long data)
2711{
2712 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2713 struct inet6_dev *idev = ifp->idev;
2714 struct in6_addr unspec;
2715 struct in6_addr mcaddr;
2716
2717 read_lock_bh(&idev->lock);
2718 if (idev->dead) {
2719 read_unlock_bh(&idev->lock);
2720 goto out;
2721 }
2722 spin_lock_bh(&ifp->lock);
2723 if (ifp->probes == 0) {
2724 /*
2725 * DAD was successful
2726 */
2727
95c385b4 2728 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2729 spin_unlock_bh(&ifp->lock);
2730 read_unlock_bh(&idev->lock);
2731
2732 addrconf_dad_completed(ifp);
2733
2734 goto out;
2735 }
2736
2737 ifp->probes--;
2738 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2739 spin_unlock_bh(&ifp->lock);
2740 read_unlock_bh(&idev->lock);
2741
2742 /* send a neighbour solicitation for our addr */
2743 memset(&unspec, 0, sizeof(unspec));
2744 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2745 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2746out:
2747 in6_ifa_put(ifp);
2748}
2749
2750static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2751{
2752 struct net_device * dev = ifp->idev->dev;
2753
2754 /*
2755 * Configure the address for reception. Now it is valid.
2756 */
2757
2758 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2759
2760 /* If added prefix is link local and forwarding is off,
2761 start sending router solicitations.
2762 */
2763
2764 if (ifp->idev->cnf.forwarding == 0 &&
2765 ifp->idev->cnf.rtr_solicits > 0 &&
2766 (dev->flags&IFF_LOOPBACK) == 0 &&
2767 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2768 struct in6_addr all_routers;
2769
2770 ipv6_addr_all_routers(&all_routers);
2771
2772 /*
2773 * If a host as already performed a random delay
2774 * [...] as part of DAD [...] there is no need
2775 * to delay again before sending the first RS
2776 */
2777 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2778
2779 spin_lock_bh(&ifp->lock);
2780 ifp->probes = 1;
2781 ifp->idev->if_flags |= IF_RS_SENT;
2782 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2783 spin_unlock_bh(&ifp->lock);
2784 }
2785}
2786
c5e33bdd
YH		 2787static void addrconf_dad_run(struct inet6_dev *idev) {
2788 struct inet6_ifaddr *ifp;
2789
2790 read_lock_bh(&idev->lock);
2791 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2792 spin_lock_bh(&ifp->lock);
2793 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2794 spin_unlock_bh(&ifp->lock);
2795 continue;
2796 }
2797 spin_unlock_bh(&ifp->lock);
2798 addrconf_dad_kick(ifp);
2799 }
2800 read_unlock_bh(&idev->lock);
2801}
2802
1da177e4
LT		 2803#ifdef CONFIG_PROC_FS
2804struct if6_iter_state {
3c40090a 2805 struct seq_net_private p;
1da177e4
LT		 2806 int bucket;
2807};
2808
2809static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2810{
2811 struct inet6_ifaddr *ifa = NULL;
2812 struct if6_iter_state *state = seq->private;
1218854a 2813 struct net *net = seq_file_net(seq);
1da177e4
LT		 2814
2815 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2816 ifa = inet6_addr_lst[state->bucket];
3c40090a 2817
878628fb 2818 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2819 ifa = ifa->lst_next;
1da177e4
LT		 2820 if (ifa)
2821 break;
2822 }
2823 return ifa;
2824}
2825
2826static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2827{
2828 struct if6_iter_state *state = seq->private;
1218854a 2829 struct net *net = seq_file_net(seq);
1da177e4
LT		 2830
2831 ifa = ifa->lst_next;
2832try_again:
3c40090a 2833 if (ifa) {
878628fb 2834 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2835 ifa = ifa->lst_next;
2836 goto try_again;
2837 }
2838 }
2839
1da177e4
LT		 2840 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2841 ifa = inet6_addr_lst[state->bucket];
2842 goto try_again;
2843 }
3c40090a 2844
1da177e4
LT		 2845 return ifa;
2846}
2847
2848static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2849{
2850 struct inet6_ifaddr *ifa = if6_get_first(seq);
2851
2852 if (ifa)
2853 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2854 --pos;
2855 return pos ? NULL : ifa;
2856}
2857
2858static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2859 __acquires(addrconf_hash_lock)
1da177e4
LT		 2860{
2861 read_lock_bh(&addrconf_hash_lock);
2862 return if6_get_idx(seq, *pos);
2863}
2864
2865static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2866{
2867 struct inet6_ifaddr *ifa;
2868
2869 ifa = if6_get_next(seq, v);
2870 ++*pos;
2871 return ifa;
2872}
2873
2874static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2875 __releases(addrconf_hash_lock)
1da177e4
LT		 2876{
2877 read_unlock_bh(&addrconf_hash_lock);
2878}
2879
2880static int if6_seq_show(struct seq_file *seq, void *v)
2881{
2882 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2883 seq_printf(seq,
9343e79a 2884 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2885 NIP6(ifp->addr),
2886 ifp->idev->dev->ifindex,
2887 ifp->prefix_len,
2888 ifp->scope,
2889 ifp->flags,
2890 ifp->idev->dev->name);
2891 return 0;
2892}
2893
56b3d975 2894static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2895 .start = if6_seq_start,
2896 .next = if6_seq_next,
2897 .show = if6_seq_show,
2898 .stop = if6_seq_stop,
2899};
2900
2901static int if6_seq_open(struct inode *inode, struct file *file)
2902{
3c40090a
DL		 2903 return seq_open_net(inode, file, &if6_seq_ops,
2904 sizeof(struct if6_iter_state));
1da177e4
LT		 2905}
2906
9a32144e 2907static const struct file_operations if6_fops = {
1da177e4
LT		 2908 .owner = THIS_MODULE,
2909 .open = if6_seq_open,
2910 .read = seq_read,
2911 .llseek = seq_lseek,
3c40090a 2912 .release = seq_release_net,
1da177e4
LT		 2913};
2914
3c40090a 2915static int if6_proc_net_init(struct net *net)
1da177e4 2916{
3c40090a 2917 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2918 return -ENOMEM;
2919 return 0;
2920}
2921
3c40090a
DL		 2922static void if6_proc_net_exit(struct net *net)
2923{
2924 proc_net_remove(net, "if_inet6");
2925}
2926
2927static struct pernet_operations if6_proc_net_ops = {
2928 .init = if6_proc_net_init,
2929 .exit = if6_proc_net_exit,
2930};
2931
2932int __init if6_proc_init(void)
2933{
2934 return register_pernet_subsys(&if6_proc_net_ops);
2935}
2936
1da177e4
LT		 2937void if6_proc_exit(void)
2938{
3c40090a 2939 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2940}
2941#endif /* CONFIG_PROC_FS */
2942
59fbb3a6 2943#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2944/* Check if address is a home address configured on any interface. */
389f6612 2945int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2946{
2947 int ret = 0;
2948 struct inet6_ifaddr * ifp;
2949 u8 hash = ipv6_addr_hash(addr);
2950 read_lock_bh(&addrconf_hash_lock);
2951 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 2952 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 2953 continue;
caad295f 2954 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 2955 (ifp->flags & IFA_F_HOMEADDRESS)) {
2956 ret = 1;
2957 break;
2958 }
2959 }
2960 read_unlock_bh(&addrconf_hash_lock);
2961 return ret;
2962}
2963#endif
2964
1da177e4
LT		 2965/*
2966 * Periodic address status verification
2967 */
2968
2969static void addrconf_verify(unsigned long foo)
2970{
2971 struct inet6_ifaddr *ifp;
2972 unsigned long now, next;
2973 int i;
2974
2975 spin_lock_bh(&addrconf_verify_lock);
2976 now = jiffies;
2977 next = now + ADDR_CHECK_FREQUENCY;
2978
2979 del_timer(&addr_chk_timer);
2980
2981 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2982
2983restart:
5d5780df 2984 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2985 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2986 unsigned long age;
2987#ifdef CONFIG_IPV6_PRIVACY
2988 unsigned long regen_advance;
2989#endif
2990
2991 if (ifp->flags & IFA_F_PERMANENT)
2992 continue;
2993
2994 spin_lock(&ifp->lock);
2995 age = (now - ifp->tstamp) / HZ;
2996
2997#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2998 regen_advance = ifp->idev->cnf.regen_max_retry *
2999 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3000 ifp->idev->nd_parms->retrans_time / HZ;
3001#endif
3002
8f27ebb9
YH		 3003 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3004 age >= ifp->valid_lft) {
1da177e4
LT		 3005 spin_unlock(&ifp->lock);
3006 in6_ifa_hold(ifp);
5d5780df 3007 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3008 ipv6_del_addr(ifp);
3009 goto restart;
8f27ebb9
YH		 3010 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3011 spin_unlock(&ifp->lock);
3012 continue;
1da177e4
LT		 3013 } else if (age >= ifp->prefered_lft) {
3014 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3015 int deprecate = 0;
3016
3017 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3018 deprecate = 1;
3019 ifp->flags |= IFA_F_DEPRECATED;
3020 }
3021
3022 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3023 next = ifp->tstamp + ifp->valid_lft * HZ;
3024
3025 spin_unlock(&ifp->lock);
3026
3027 if (deprecate) {
3028 in6_ifa_hold(ifp);
5d5780df 3029 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3030
3031 ipv6_ifa_notify(0, ifp);
3032 in6_ifa_put(ifp);
3033 goto restart;
3034 }
3035#ifdef CONFIG_IPV6_PRIVACY
3036 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3037 !(ifp->flags&IFA_F_TENTATIVE)) {
3038 if (age >= ifp->prefered_lft - regen_advance) {
3039 struct inet6_ifaddr *ifpub = ifp->ifpub;
3040 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3041 next = ifp->tstamp + ifp->prefered_lft * HZ;
3042 if (!ifp->regen_count && ifpub) {
3043 ifp->regen_count++;
3044 in6_ifa_hold(ifp);
3045 in6_ifa_hold(ifpub);
3046 spin_unlock(&ifp->lock);
5d5780df 3047 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3048 spin_lock(&ifpub->lock);
3049 ifpub->regen_count = 0;
3050 spin_unlock(&ifpub->lock);
1da177e4
LT		 3051 ipv6_create_tempaddr(ifpub, ifp);
3052 in6_ifa_put(ifpub);
3053 in6_ifa_put(ifp);
3054 goto restart;
3055 }
3056 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3057 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3058 spin_unlock(&ifp->lock);
3059#endif
3060 } else {
3061 /* ifp->prefered_lft <= ifp->valid_lft */
3062 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3063 next = ifp->tstamp + ifp->prefered_lft * HZ;
3064 spin_unlock(&ifp->lock);
3065 }
3066 }
5d5780df 3067 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3068 }
3069
3070 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3071 add_timer(&addr_chk_timer);
3072 spin_unlock_bh(&addrconf_verify_lock);
3073}
3074
461d8837
TG		 3075static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3076{
3077 struct in6_addr *pfx = NULL;
3078
3079 if (addr)
3080 pfx = nla_data(addr);
3081
3082 if (local) {
3083 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3084 pfx = NULL;
3085 else
3086 pfx = nla_data(local);
3087 }
3088
3089 return pfx;
3090}
3091
ef7c79ed 3092static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3093 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3094 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3095 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3096};
3097
1da177e4
LT		 3098static int
3099inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3100{
3b1e0a65 3101 struct net *net = sock_net(skb->sk);
b933f716
TG		 3102 struct ifaddrmsg *ifm;
3103 struct nlattr *tb[IFA_MAX+1];
1da177e4 3104 struct in6_addr *pfx;
b933f716 3105 int err;
1da177e4 3106
b933f716
TG		 3107 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3108 if (err < 0)
3109 return err;
3110
3111 ifm = nlmsg_data(nlh);
3112 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3113 if (pfx == NULL)
3114 return -EINVAL;
3115
af284937 3116 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3117}
3118
55ebaef1
NT		 3119static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3120 u32 prefered_lft, u32 valid_lft)
081bba5b 3121{
46d48046
YH		 3122 u32 flags = RTF_EXPIRES;
3123
081bba5b
NT		 3124 if (!valid_lft || (prefered_lft > valid_lft))
3125 return -EINVAL;
3126
46d48046 3127 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3128 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3129 flags = 0;
3130 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3131 valid_lft = 0x7FFFFFFF/HZ;
3132
3133 if (prefered_lft == 0)
55ebaef1 3134 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3135 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3136 (prefered_lft != INFINITY_LIFE_TIME))
3137 prefered_lft = 0x7FFFFFFF/HZ;
3138
3139 spin_lock_bh(&ifp->lock);
3b9f9a1c 3140 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3141 ifp->tstamp = jiffies;
3142 ifp->valid_lft = valid_lft;
3143 ifp->prefered_lft = prefered_lft;
3144
3145 spin_unlock_bh(&ifp->lock);
3146 if (!(ifp->flags&IFA_F_TENTATIVE))
3147 ipv6_ifa_notify(0, ifp);
081bba5b 3148
46d48046
YH		 3149 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3150 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3151 addrconf_verify(0);
3152
3153 return 0;
3154}
3155
1da177e4
LT		 3156static int
3157inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3158{
3b1e0a65 3159 struct net *net = sock_net(skb->sk);
461d8837
TG		 3160 struct ifaddrmsg *ifm;
3161 struct nlattr *tb[IFA_MAX+1];
1da177e4 3162 struct in6_addr *pfx;
7198f8ce
TG		 3163 struct inet6_ifaddr *ifa;
3164 struct net_device *dev;
55ebaef1
NT		 3165 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3166 u8 ifa_flags;
461d8837 3167 int err;
1da177e4 3168
461d8837
TG		 3169 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3170 if (err < 0)
3171 return err;
3172
3173 ifm = nlmsg_data(nlh);
3174 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3175 if (pfx == NULL)
3176 return -EINVAL;
3177
461d8837 3178 if (tb[IFA_CACHEINFO]) {
0778769d 3179 struct ifa_cacheinfo *ci;
461d8837
TG		 3180
3181 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3182 valid_lft = ci->ifa_valid;
461d8837
TG		 3183 preferred_lft = ci->ifa_prefered;
3184 } else {
3185 preferred_lft = INFINITY_LIFE_TIME;
3186 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3187 }
3188
af284937 3189 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3190 if (dev == NULL)
3191 return -ENODEV;
3192
55ebaef1 3193 /* We ignore other flags so far. */
3b9f9a1c 3194 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3195
1cab3da6 3196 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3197 if (ifa == NULL) {
3198 /*
3199 * It would be best to check for !NLM_F_CREATE here but
3200 * userspace alreay relies on not having to provide this.
3201 */
af284937
DL		 3202 return inet6_addr_add(net, ifm->ifa_index, pfx,
3203 ifm->ifa_prefixlen, ifa_flags,
3204 preferred_lft, valid_lft);
081bba5b
NT		 3205 }
3206
7198f8ce
TG		 3207 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3208 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3209 err = -EEXIST;
3210 else
55ebaef1 3211 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3212
3213 in6_ifa_put(ifa);
3214
3215 return err;
1da177e4
LT		 3216}
3217
101bb229
TG		 3218static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3219 u8 scope, int ifindex)
3220{
3221 struct ifaddrmsg *ifm;
3222
3223 ifm = nlmsg_data(nlh);
3224 ifm->ifa_family = AF_INET6;
3225 ifm->ifa_prefixlen = prefixlen;
3226 ifm->ifa_flags = flags;
3227 ifm->ifa_scope = scope;
3228 ifm->ifa_index = ifindex;
3229}
3230
85486af0
TG		 3231static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3232 unsigned long tstamp, u32 preferred, u32 valid)
3233{
3234 struct ifa_cacheinfo ci;
3235
3236 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3237 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3238 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3239 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3240 ci.ifa_prefered = preferred;
3241 ci.ifa_valid = valid;
3242
3243 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3244}
3245
101bb229
TG		 3246static inline int rt_scope(int ifa_scope)
3247{
3248 if (ifa_scope & IFA_HOST)
3249 return RT_SCOPE_HOST;
3250 else if (ifa_scope & IFA_LINK)
3251 return RT_SCOPE_LINK;
3252 else if (ifa_scope & IFA_SITE)
3253 return RT_SCOPE_SITE;
3254 else
3255 return RT_SCOPE_UNIVERSE;
3256}
3257
0ab6803b
TG		 3258static inline int inet6_ifaddr_msgsize(void)
3259{
339bf98f
TG		 3260 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3261 + nla_total_size(16) /* IFA_ADDRESS */
3262 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3263}
c5396a31 3264
1da177e4 3265static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3266 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3267{
1da177e4 3268 struct nlmsghdr *nlh;
85486af0 3269 u32 preferred, valid;
1da177e4 3270
0ab6803b
TG		 3271 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3272 if (nlh == NULL)
26932566 3273 return -EMSGSIZE;
0ab6803b 3274
101bb229
TG		 3275 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3276 ifa->idev->dev->ifindex);
3277
1da177e4 3278 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3279 preferred = ifa->prefered_lft;
3280 valid = ifa->valid_lft;
3281 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3282 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3283 preferred -= tval;
3284 if (valid != INFINITY_LIFE_TIME)
3285 valid -= tval;
1da177e4
LT		 3286 }
3287 } else {
85486af0
TG		 3288 preferred = INFINITY_LIFE_TIME;
3289 valid = INFINITY_LIFE_TIME;
3290 }
3291
0ab6803b 3292 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3293 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3294 nlmsg_cancel(skb, nlh);
3295 return -EMSGSIZE;
3296 }
1da177e4 3297
0ab6803b 3298 return nlmsg_end(skb, nlh);
1da177e4
LT		 3299}
3300
3301static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3302 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3303{
1da177e4 3304 struct nlmsghdr *nlh;
101bb229
TG		 3305 u8 scope = RT_SCOPE_UNIVERSE;
3306 int ifindex = ifmca->idev->dev->ifindex;
3307
3308 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3309 scope = RT_SCOPE_SITE;
1da177e4 3310
0ab6803b
TG		 3311 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3312 if (nlh == NULL)
26932566 3313 return -EMSGSIZE;
85486af0 3314
0ab6803b
TG		 3315 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3316 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3317 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3318 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3319 nlmsg_cancel(skb, nlh);
3320 return -EMSGSIZE;
3321 }
85486af0 3322
0ab6803b 3323 return nlmsg_end(skb, nlh);
1da177e4
LT		 3324}
3325
3326static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3327 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3328{
1da177e4 3329 struct nlmsghdr *nlh;
101bb229
TG		 3330 u8 scope = RT_SCOPE_UNIVERSE;
3331 int ifindex = ifaca->aca_idev->dev->ifindex;
3332
3333 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3334 scope = RT_SCOPE_SITE;
1da177e4 3335
0ab6803b
TG		 3336 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3337 if (nlh == NULL)
26932566 3338 return -EMSGSIZE;
85486af0 3339
0ab6803b
TG		 3340 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3341 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3342 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3343 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3344 nlmsg_cancel(skb, nlh);
3345 return -EMSGSIZE;
3346 }
1da177e4 3347
0ab6803b 3348 return nlmsg_end(skb, nlh);
1da177e4
LT		 3349}
3350
3351enum addr_type_t
3352{
3353 UNICAST_ADDR,
3354 MULTICAST_ADDR,
3355 ANYCAST_ADDR,
3356};
3357
3358static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3359 enum addr_type_t type)
3360{
3361 int idx, ip_idx;
3362 int s_idx, s_ip_idx;
3363 int err = 1;
3364 struct net_device *dev;
3365 struct inet6_dev *idev = NULL;
3366 struct inet6_ifaddr *ifa;
3367 struct ifmcaddr6 *ifmca;
3368 struct ifacaddr6 *ifaca;
3b1e0a65 3369 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3370
3371 s_idx = cb->args[0];
3372 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3373
7562f876 3374 idx = 0;
6fda7350 3375 for_each_netdev(net, dev) {
1da177e4 3376 if (idx < s_idx)
7562f876 3377 goto cont;
1da177e4
LT		 3378 if (idx > s_idx)
3379 s_ip_idx = 0;
3380 ip_idx = 0;
3381 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3382 goto cont;
1da177e4
LT		 3383 read_lock_bh(&idev->lock);
3384 switch (type) {
3385 case UNICAST_ADDR:
ae9cda5d 3386 /* unicast address incl. temp addr */
1da177e4
LT		 3387 for (ifa = idev->addr_list; ifa;
3388 ifa = ifa->if_next, ip_idx++) {
3389 if (ip_idx < s_ip_idx)
3390 continue;
5d5619b4
YH		 3391 err = inet6_fill_ifaddr(skb, ifa,
3392 NETLINK_CB(cb->skb).pid,
3393 cb->nlh->nlmsg_seq,
3394 RTM_NEWADDR,
3395 NLM_F_MULTI);
1da177e4 3396 }
1da177e4
LT		 3397 break;
3398 case MULTICAST_ADDR:
3399 /* multicast address */
1ab1457c 3400 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3401 ifmca = ifmca->next, ip_idx++) {
3402 if (ip_idx < s_ip_idx)
3403 continue;
5d5619b4
YH		 3404 err = inet6_fill_ifmcaddr(skb, ifmca,
3405 NETLINK_CB(cb->skb).pid,
3406 cb->nlh->nlmsg_seq,
3407 RTM_GETMULTICAST,
3408 NLM_F_MULTI);
1da177e4
LT		 3409 }
3410 break;
3411 case ANYCAST_ADDR:
3412 /* anycast address */
3413 for (ifaca = idev->ac_list; ifaca;
3414 ifaca = ifaca->aca_next, ip_idx++) {
3415 if (ip_idx < s_ip_idx)
3416 continue;
5d5619b4
YH		 3417 err = inet6_fill_ifacaddr(skb, ifaca,
3418 NETLINK_CB(cb->skb).pid,
3419 cb->nlh->nlmsg_seq,
3420 RTM_GETANYCAST,
3421 NLM_F_MULTI);
1da177e4
LT		 3422 }
3423 break;
3424 default:
3425 break;
3426 }
3427 read_unlock_bh(&idev->lock);
3428 in6_dev_put(idev);
5d5619b4
YH		 3429
3430 if (err <= 0)
3431 break;
7562f876
PE		 3432cont:
3433 idx++;
1da177e4 3434 }
1da177e4
LT		 3435 cb->args[0] = idx;
3436 cb->args[1] = ip_idx;
3437 return skb->len;
3438}
3439
3440static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3441{
3442 enum addr_type_t type = UNICAST_ADDR;
b854272b 3443
1da177e4
LT		 3444 return inet6_dump_addr(skb, cb, type);
3445}
3446
3447static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3448{
3449 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3450
1da177e4
LT		 3451 return inet6_dump_addr(skb, cb, type);
3452}
3453
3454
3455static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3456{
3457 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3458
1da177e4
LT		 3459 return inet6_dump_addr(skb, cb, type);
3460}
3461
1b29fc2c
TG		 3462static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3463 void *arg)
6c223828 3464{
3b1e0a65 3465 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3466 struct ifaddrmsg *ifm;
3467 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3468 struct in6_addr *addr = NULL;
3469 struct net_device *dev = NULL;
3470 struct inet6_ifaddr *ifa;
3471 struct sk_buff *skb;
6c223828
NT		 3472 int err;
3473
1b29fc2c
TG		 3474 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3475 if (err < 0)
3476 goto errout;
3477
3478 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3479 if (addr == NULL) {
3480 err = -EINVAL;
3481 goto errout;
6c223828 3482 }
6c223828 3483
1b29fc2c 3484 ifm = nlmsg_data(nlh);
6c223828 3485 if (ifm->ifa_index)
6fda7350 3486 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3487
1cab3da6 3488 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3489 err = -EADDRNOTAVAIL;
3490 goto errout;
3491 }
6c223828 3492
0ab6803b 3493 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3494 err = -ENOBUFS;
1b29fc2c 3495 goto errout_ifa;
6c223828
NT		 3496 }
3497
6c223828
NT		 3498 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3499 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3500 if (err < 0) {
3501 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3502 WARN_ON(err == -EMSGSIZE);
3503 kfree_skb(skb);
3504 goto errout_ifa;
3505 }
6fda7350 3506 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3507errout_ifa:
6c223828 3508 in6_ifa_put(ifa);
1b29fc2c 3509errout:
6c223828 3510 return err;
6c223828
NT		 3511}
3512
1da177e4
LT		 3513static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3514{
3515 struct sk_buff *skb;
c346dca1 3516 struct net *net = dev_net(ifa->idev->dev);
5d620266 3517 int err = -ENOBUFS;
1da177e4 3518
0ab6803b 3519 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3520 if (skb == NULL)
3521 goto errout;
3522
3523 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3524 if (err < 0) {
3525 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3526 WARN_ON(err == -EMSGSIZE);
3527 kfree_skb(skb);
3528 goto errout;
3529 }
6fda7350 3530 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3531errout:
3532 if (err < 0)
6fda7350 3533 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3534}
3535
b6f99a21 3536static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3537 __s32 *array, int bytes)
3538{
04561c1f
TG		 3539 BUG_ON(bytes < (DEVCONF_MAX * 4));
3540
1da177e4
LT		 3541 memset(array, 0, bytes);
3542 array[DEVCONF_FORWARDING] = cnf->forwarding;
3543 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3544 array[DEVCONF_MTU6] = cnf->mtu6;
3545 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3546 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3547 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3548 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3549 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3550 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3551 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3552 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3553#ifdef CONFIG_IPV6_PRIVACY
3554 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3555 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3556 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3557 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3558 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3559#endif
3560 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3561 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3562 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3563#ifdef CONFIG_IPV6_ROUTER_PREF
3564 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3565 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3566#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3567 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3568#endif
930d6ff2 3569#endif
fbea49e1 3570 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3571 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3572#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3573 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3574#endif
7bc570c8
YH		 3575#ifdef CONFIG_IPV6_MROUTE
3576 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3577#endif
1da177e4
LT		 3578}
3579
339bf98f
TG		 3580static inline size_t inet6_if_nlmsg_size(void)
3581{
3582 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3583 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3584 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3585 + nla_total_size(4) /* IFLA_MTU */
3586 + nla_total_size(4) /* IFLA_LINK */
3587 + nla_total_size( /* IFLA_PROTINFO */
3588 nla_total_size(4) /* IFLA_INET6_FLAGS */
3589 + nla_total_size(sizeof(struct ifla_cacheinfo))
3590 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3591 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3592 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3593 );
3594}
c5396a31 3595
7f7d9a6b
HX		 3596static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3597 int bytes)
3598{
3599 int i;
3600 int pad = bytes - sizeof(u64) * items;
3601 BUG_ON(pad < 0);
3602
3603 /* Use put_unaligned() because stats may not be aligned for u64. */
3604 put_unaligned(items, &stats[0]);
3605 for (i = 1; i < items; i++)
3606 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3607
3608 memset(&stats[items], 0, pad);
3609}
3610
3611static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3612 int bytes)
3613{
3614 switch(attrtype) {
3615 case IFLA_INET6_STATS:
3616 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3617 break;
3618 case IFLA_INET6_ICMP6STATS:
3619 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3620 break;
3621 }
3622}
3623
1ab1457c 3624static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3625 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3626{
04561c1f 3627 struct net_device *dev = idev->dev;
bf99f1bd 3628 struct nlattr *nla;
04561c1f
TG		 3629 struct ifinfomsg *hdr;
3630 struct nlmsghdr *nlh;
3631 void *protoinfo;
3632 struct ifla_cacheinfo ci;
3633
3634 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3635 if (nlh == NULL)
26932566 3636 return -EMSGSIZE;
04561c1f
TG		 3637
3638 hdr = nlmsg_data(nlh);
3639 hdr->ifi_family = AF_INET6;
3640 hdr->__ifi_pad = 0;
3641 hdr->ifi_type = dev->type;
3642 hdr->ifi_index = dev->ifindex;
3643 hdr->ifi_flags = dev_get_flags(dev);
3644 hdr->ifi_change = 0;
3645
3646 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3647
3648 if (dev->addr_len)
04561c1f 3649 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3650
04561c1f 3651 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3652 if (dev->ifindex != dev->iflink)
04561c1f 3653 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3654
04561c1f
TG		 3655 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3656 if (protoinfo == NULL)
3657 goto nla_put_failure;
1da177e4 3658
04561c1f 3659 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3660
1da177e4
LT		 3661 ci.max_reasm_len = IPV6_MAXPLEN;
3662 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3663 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3664 ci.reachable_time = idev->nd_parms->reachable_time;
3665 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3666 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3667
bf99f1bd
YH		 3668 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3669 if (nla == NULL)
04561c1f 3670 goto nla_put_failure;
bf99f1bd 3671 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3672
bf99f1bd
YH		 3673 /* XXX - MC not implemented */
3674
3675 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3676 if (nla == NULL)
3677 goto nla_put_failure;
3678 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3679
3680 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3681 if (nla == NULL)
3682 goto nla_put_failure;
3683 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3684
04561c1f
TG		 3685 nla_nest_end(skb, protoinfo);
3686 return nlmsg_end(skb, nlh);
1da177e4 3687
04561c1f 3688nla_put_failure:
26932566
PM		 3689 nlmsg_cancel(skb, nlh);
3690 return -EMSGSIZE;
1da177e4
LT		 3691}
3692
3693static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3694{
3b1e0a65 3695 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3696 int idx, err;
3697 int s_idx = cb->args[0];
3698 struct net_device *dev;
3699 struct inet6_dev *idev;
3700
3701 read_lock(&dev_base_lock);
7562f876 3702 idx = 0;
6fda7350 3703 for_each_netdev(net, dev) {
1da177e4 3704 if (idx < s_idx)
7562f876 3705 goto cont;
1da177e4 3706 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3707 goto cont;
1ab1457c 3708 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3709 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3710 in6_dev_put(idev);
3711 if (err <= 0)
3712 break;
7562f876
PE		 3713cont:
3714 idx++;
1da177e4
LT		 3715 }
3716 read_unlock(&dev_base_lock);
3717 cb->args[0] = idx;
3718
3719 return skb->len;
3720}
3721
3722void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3723{
3724 struct sk_buff *skb;
c346dca1 3725 struct net *net = dev_net(idev->dev);
8d7a76c9 3726 int err = -ENOBUFS;
1ab1457c 3727
339bf98f 3728 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3729 if (skb == NULL)
3730 goto errout;
3731
3732 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3733 if (err < 0) {
3734 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3735 WARN_ON(err == -EMSGSIZE);
3736 kfree_skb(skb);
3737 goto errout;
3738 }
6fda7350 3739 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3740errout:
3741 if (err < 0)
6fda7350 3742 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3743}
3744
339bf98f
TG		 3745static inline size_t inet6_prefix_nlmsg_size(void)
3746{
3747 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3748 + nla_total_size(sizeof(struct in6_addr))
3749 + nla_total_size(sizeof(struct prefix_cacheinfo));
3750}
c5396a31 3751
1da177e4 3752static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3753 struct prefix_info *pinfo, u32 pid, u32 seq,
3754 int event, unsigned int flags)
1da177e4 3755{
6051e2f4
TG		 3756 struct prefixmsg *pmsg;
3757 struct nlmsghdr *nlh;
1da177e4
LT		 3758 struct prefix_cacheinfo ci;
3759
6051e2f4
TG		 3760 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3761 if (nlh == NULL)
26932566 3762 return -EMSGSIZE;
6051e2f4
TG		 3763
3764 pmsg = nlmsg_data(nlh);
1da177e4 3765 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3766 pmsg->prefix_pad1 = 0;
3767 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3768 pmsg->prefix_ifindex = idev->dev->ifindex;
3769 pmsg->prefix_len = pinfo->prefix_len;
3770 pmsg->prefix_type = pinfo->type;
8a47077a 3771 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3772 pmsg->prefix_flags = 0;
3773 if (pinfo->onlink)
3774 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3775 if (pinfo->autoconf)
3776 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3777
6051e2f4 3778 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3779
3780 ci.preferred_time = ntohl(pinfo->prefered);
3781 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3782 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3783
6051e2f4 3784 return nlmsg_end(skb, nlh);
1da177e4 3785
6051e2f4 3786nla_put_failure:
26932566
PM		 3787 nlmsg_cancel(skb, nlh);
3788 return -EMSGSIZE;
1da177e4
LT		 3789}
3790
1ab1457c 3791static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3792 struct prefix_info *pinfo)
3793{
3794 struct sk_buff *skb;
c346dca1 3795 struct net *net = dev_net(idev->dev);
8c384bfa 3796 int err = -ENOBUFS;
1da177e4 3797
339bf98f 3798 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3799 if (skb == NULL)
3800 goto errout;
3801
3802 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3803 if (err < 0) {
3804 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3805 WARN_ON(err == -EMSGSIZE);
3806 kfree_skb(skb);
3807 goto errout;
3808 }
6fda7350 3809 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3810errout:
3811 if (err < 0)
6fda7350 3812 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3813}
3814
1da177e4
LT		 3815static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3816{
3817 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3818
3819 switch (event) {
3820 case RTM_NEWADDR:
95c385b4
NH		 3821 /*
3822 * If the address was optimistic
3823 * we inserted the route at the start of
3824 * our DAD process, so we don't need
3825 * to do it again
3826 */
3827 if (!(ifp->rt->rt6i_node))
3828 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3829 if (ifp->idev->cnf.forwarding)
3830 addrconf_join_anycast(ifp);
3831 break;
3832 case RTM_DELADDR:
3833 if (ifp->idev->cnf.forwarding)
3834 addrconf_leave_anycast(ifp);
3835 addrconf_leave_solict(ifp->idev, &ifp->addr);
3836 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3837 if (ip6_del_rt(ifp->rt))
1da177e4 3838 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3839 break;
3840 }
3841}
3842
3843static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3844{
8814c4b5 3845 rcu_read_lock_bh();
1da177e4
LT		 3846 if (likely(ifp->idev->dead == 0))
3847 __ipv6_ifa_notify(event, ifp);
8814c4b5 3848 rcu_read_unlock_bh();
1da177e4
LT		 3849}
3850
3851#ifdef CONFIG_SYSCTL
3852
3853static
3854int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3855 void __user *buffer, size_t *lenp, loff_t *ppos)
3856{
3857 int *valp = ctl->data;
3858 int val = *valp;
3859 int ret;
3860
3861 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3862
c8fecf22
PE		 3863 if (write)
3864 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3865 return ret;
1da177e4
LT		 3866}
3867
1ab1457c 3868static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3869 int __user *name, int nlen,
3870 void __user *oldval,
3871 size_t __user *oldlenp,
1f29bcd7 3872 void __user *newval, size_t newlen)
1da177e4
LT		 3873{
3874 int *valp = table->data;
c8fecf22 3875 int val = *valp;
1da177e4
LT		 3876 int new;
3877
3878 if (!newval || !newlen)
3879 return 0;
3880 if (newlen != sizeof(int))
3881 return -EINVAL;
3882 if (get_user(new, (int __user *)newval))
3883 return -EFAULT;
3884 if (new == *valp)
3885 return 0;
3886 if (oldval && oldlenp) {
3887 size_t len;
3888 if (get_user(len, oldlenp))
3889 return -EFAULT;
3890 if (len) {
3891 if (len > table->maxlen)
3892 len = table->maxlen;
3893 if (copy_to_user(oldval, valp, len))
3894 return -EFAULT;
3895 if (put_user(len, oldlenp))
3896 return -EFAULT;
3897 }
3898 }
3899
c8fecf22
PE		 3900 *valp = new;
3901 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3902 return 1;
3903}
3904
3905static struct addrconf_sysctl_table
3906{
3907 struct ctl_table_header *sysctl_header;
f6a07b29 3908 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 3909 char *dev_name;
ab32ea5d 3910} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3911 .sysctl_header = NULL,
3912 .addrconf_vars = {
1ab1457c 3913 {
1da177e4
LT		 3914 .ctl_name = NET_IPV6_FORWARDING,
3915 .procname = "forwarding",
1ab1457c 3916 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3917 .maxlen = sizeof(int),
3918 .mode = 0644,
1ab1457c 3919 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3920 .strategy = &addrconf_sysctl_forward_strategy,
3921 },
3922 {
3923 .ctl_name = NET_IPV6_HOP_LIMIT,
3924 .procname = "hop_limit",
1ab1457c 3925 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3926 .maxlen = sizeof(int),
3927 .mode = 0644,
3928 .proc_handler = proc_dointvec,
3929 },
3930 {
3931 .ctl_name = NET_IPV6_MTU,
3932 .procname = "mtu",
3933 .data = &ipv6_devconf.mtu6,
1ab1457c 3934 .maxlen = sizeof(int),
1da177e4 3935 .mode = 0644,
1ab1457c 3936 .proc_handler = &proc_dointvec,
1da177e4
LT		 3937 },
3938 {
3939 .ctl_name = NET_IPV6_ACCEPT_RA,
3940 .procname = "accept_ra",
1ab1457c 3941 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3942 .maxlen = sizeof(int),
3943 .mode = 0644,
1ab1457c 3944 .proc_handler = &proc_dointvec,
1da177e4
LT		 3945 },
3946 {
3947 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3948 .procname = "accept_redirects",
1ab1457c 3949 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3950 .maxlen = sizeof(int),
3951 .mode = 0644,
1ab1457c 3952 .proc_handler = &proc_dointvec,
1da177e4
LT		 3953 },
3954 {
3955 .ctl_name = NET_IPV6_AUTOCONF,
3956 .procname = "autoconf",
1ab1457c 3957 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3958 .maxlen = sizeof(int),
3959 .mode = 0644,
1ab1457c 3960 .proc_handler = &proc_dointvec,
1da177e4
LT		 3961 },
3962 {
3963 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3964 .procname = "dad_transmits",
1ab1457c 3965 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3966 .maxlen = sizeof(int),
3967 .mode = 0644,
1ab1457c 3968 .proc_handler = &proc_dointvec,
1da177e4
LT		 3969 },
3970 {
3971 .ctl_name = NET_IPV6_RTR_SOLICITS,
3972 .procname = "router_solicitations",
1ab1457c 3973 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3974 .maxlen = sizeof(int),
3975 .mode = 0644,
1ab1457c 3976 .proc_handler = &proc_dointvec,
1da177e4
LT		 3977 },
3978 {
3979 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3980 .procname = "router_solicitation_interval",
1ab1457c 3981 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3982 .maxlen = sizeof(int),
3983 .mode = 0644,
1ab1457c 3984 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3985 .strategy = &sysctl_jiffies,
3986 },
3987 {
3988 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3989 .procname = "router_solicitation_delay",
1ab1457c 3990 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3991 .maxlen = sizeof(int),
3992 .mode = 0644,
1ab1457c 3993 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3994 .strategy = &sysctl_jiffies,
3995 },
3996 {
3997 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3998 .procname = "force_mld_version",
1ab1457c 3999 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4000 .maxlen = sizeof(int),
4001 .mode = 0644,
1ab1457c 4002 .proc_handler = &proc_dointvec,
1da177e4
LT		 4003 },
4004#ifdef CONFIG_IPV6_PRIVACY
4005 {
4006 .ctl_name = NET_IPV6_USE_TEMPADDR,
4007 .procname = "use_tempaddr",
1ab1457c 4008 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4009 .maxlen = sizeof(int),
4010 .mode = 0644,
1ab1457c 4011 .proc_handler = &proc_dointvec,
1da177e4
LT		 4012 },
4013 {
4014 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4015 .procname = "temp_valid_lft",
1ab1457c 4016 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4017 .maxlen = sizeof(int),
4018 .mode = 0644,
1ab1457c 4019 .proc_handler = &proc_dointvec,
1da177e4
LT		 4020 },
4021 {
4022 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4023 .procname = "temp_prefered_lft",
1ab1457c 4024 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4025 .maxlen = sizeof(int),
4026 .mode = 0644,
1ab1457c 4027 .proc_handler = &proc_dointvec,
1da177e4
LT		 4028 },
4029 {
4030 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4031 .procname = "regen_max_retry",
1ab1457c 4032 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4033 .maxlen = sizeof(int),
4034 .mode = 0644,
1ab1457c 4035 .proc_handler = &proc_dointvec,
1da177e4
LT		 4036 },
4037 {
4038 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4039 .procname = "max_desync_factor",
1ab1457c 4040 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4041 .maxlen = sizeof(int),
4042 .mode = 0644,
1ab1457c 4043 .proc_handler = &proc_dointvec,
1da177e4
LT		 4044 },
4045#endif
4046 {
4047 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4048 .procname = "max_addresses",
4049 .data = &ipv6_devconf.max_addresses,
4050 .maxlen = sizeof(int),
4051 .mode = 0644,
4052 .proc_handler = &proc_dointvec,
4053 },
65f5c7c1
YH		 4054 {
4055 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4056 .procname = "accept_ra_defrtr",
1ab1457c 4057 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4058 .maxlen = sizeof(int),
4059 .mode = 0644,
1ab1457c 4060 .proc_handler = &proc_dointvec,
65f5c7c1 4061 },
c4fd30eb
YH		 4062 {
4063 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4064 .procname = "accept_ra_pinfo",
1ab1457c 4065 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4066 .maxlen = sizeof(int),
4067 .mode = 0644,
1ab1457c 4068 .proc_handler = &proc_dointvec,
c4fd30eb 4069 },
930d6ff2
YH		 4070#ifdef CONFIG_IPV6_ROUTER_PREF
4071 {
4072 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4073 .procname = "accept_ra_rtr_pref",
4074 .data = &ipv6_devconf.accept_ra_rtr_pref,
4075 .maxlen = sizeof(int),
4076 .mode = 0644,
4077 .proc_handler = &proc_dointvec,
4078 },
52e16356
YH		 4079 {
4080 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4081 .procname = "router_probe_interval",
4082 .data = &ipv6_devconf.rtr_probe_interval,
4083 .maxlen = sizeof(int),
4084 .mode = 0644,
4085 .proc_handler = &proc_dointvec_jiffies,
4086 .strategy = &sysctl_jiffies,
4087 },
fa03ef38 4088#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4089 {
4090 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4091 .procname = "accept_ra_rt_info_max_plen",
4092 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4093 .maxlen = sizeof(int),
4094 .mode = 0644,
4095 .proc_handler = &proc_dointvec,
4096 },
4097#endif
930d6ff2 4098#endif
fbea49e1
YH		 4099 {
4100 .ctl_name = NET_IPV6_PROXY_NDP,
4101 .procname = "proxy_ndp",
4102 .data = &ipv6_devconf.proxy_ndp,
4103 .maxlen = sizeof(int),
4104 .mode = 0644,
4105 .proc_handler = &proc_dointvec,
4106 },
0bcbc926
YH		 4107 {
4108 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4109 .procname = "accept_source_route",
4110 .data = &ipv6_devconf.accept_source_route,
4111 .maxlen = sizeof(int),
4112 .mode = 0644,
4113 .proc_handler = &proc_dointvec,
4114 },
95c385b4
NH		 4115#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4116 {
4117 .ctl_name = CTL_UNNUMBERED,
4118 .procname = "optimistic_dad",
4119 .data = &ipv6_devconf.optimistic_dad,
4120 .maxlen = sizeof(int),
4121 .mode = 0644,
4122 .proc_handler = &proc_dointvec,
4123
4124 },
7bc570c8
YH		 4125#endif
4126#ifdef CONFIG_IPV6_MROUTE
4127 {
4128 .ctl_name = CTL_UNNUMBERED,
4129 .procname = "mc_forwarding",
4130 .data = &ipv6_devconf.mc_forwarding,
4131 .maxlen = sizeof(int),
4132 .mode = 0644,
4133 .proc_handler = &proc_dointvec,
4134 },
95c385b4 4135#endif
1da177e4
LT		 4136 {
4137 .ctl_name = 0, /* sentinel */
4138 }
4139 },
1da177e4
LT		 4140};
4141
bff16c2f
PE		 4142static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4143 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4144{
4145 int i;
1da177e4 4146 struct addrconf_sysctl_table *t;
1da177e4 4147
1dab6222
PE		 4148#define ADDRCONF_CTL_PATH_DEV 3
4149
4150 struct ctl_path addrconf_ctl_path[] = {
4151 { .procname = "net", .ctl_name = CTL_NET, },
4152 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4153 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4154 { /* to be set */ },
4155 { },
4156 };
4157
4158
af879cc7 4159 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4160 if (t == NULL)
f68635e6
PE		 4161 goto out;
4162
1da177e4
LT		 4163 for (i=0; t->addrconf_vars[i].data; i++) {
4164 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4165 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4166 t->addrconf_vars[i].extra2 = net;
1da177e4 4167 }
1da177e4 4168
1ab1457c
YH		 4169 /*
4170 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4171 * by sysctl and we wouldn't want anyone to change it under our feet
4172 * (see SIOCSIFNAME).
1ab1457c 4173 */
1dab6222
PE		 4174 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4175 if (!t->dev_name)
f68635e6 4176 goto free;
1da177e4 4177
1dab6222
PE		 4178 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4179 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4180
bff16c2f 4181 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4182 t->addrconf_vars);
1da177e4
LT		 4183 if (t->sysctl_header == NULL)
4184 goto free_procname;
f68635e6
PE		 4185
4186 p->sysctl = t;
95897312 4187 return 0;
1da177e4 4188
f68635e6 4189free_procname:
1dab6222 4190 kfree(t->dev_name);
f68635e6 4191free:
1da177e4 4192 kfree(t);
f68635e6 4193out:
95897312 4194 return -ENOBUFS;
1da177e4
LT		 4195}
4196
408c4768
PE		 4197static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4198{
4199 struct addrconf_sysctl_table *t;
4200
4201 if (p->sysctl == NULL)
4202 return;
4203
4204 t = p->sysctl;
4205 p->sysctl = NULL;
4206 unregister_sysctl_table(t->sysctl_header);
4207 kfree(t->dev_name);
4208 kfree(t);
4209}
4210
f52295a9
PE		 4211static void addrconf_sysctl_register(struct inet6_dev *idev)
4212{
408c4768
PE		 4213 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4214 NET_IPV6_NEIGH, "ipv6",
4215 &ndisc_ifinfo_sysctl_change,
4216 NULL);
c346dca1 4217 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4218 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4219}
4220
408c4768 4221static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4222{
408c4768
PE		 4223 __addrconf_sysctl_unregister(&idev->cnf);
4224 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4225}
4226
4227
4228#endif
4229
e0da5a48
PE		 4230static int addrconf_init_net(struct net *net)
4231{
4232 int err;
4233 struct ipv6_devconf *all, *dflt;
4234
4235 err = -ENOMEM;
4236 all = &ipv6_devconf;
4237 dflt = &ipv6_devconf_dflt;
4238
4239 if (net != &init_net) {
4240 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4241 if (all == NULL)
4242 goto err_alloc_all;
4243
4244 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4245 if (dflt == NULL)
4246 goto err_alloc_dflt;
4247 }
4248
4249 net->ipv6.devconf_all = all;
4250 net->ipv6.devconf_dflt = dflt;
4251
4252#ifdef CONFIG_SYSCTL
4253 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4254 NULL, all);
4255 if (err < 0)
4256 goto err_reg_all;
4257
4258 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4259 NULL, dflt);
4260 if (err < 0)
4261 goto err_reg_dflt;
4262#endif
4263 return 0;
4264
4265#ifdef CONFIG_SYSCTL
4266err_reg_dflt:
4267 __addrconf_sysctl_unregister(all);
4268err_reg_all:
4269 kfree(dflt);
4270#endif
4271err_alloc_dflt:
4272 kfree(all);
4273err_alloc_all:
4274 return err;
4275}
4276
4277static void addrconf_exit_net(struct net *net)
4278{
4279#ifdef CONFIG_SYSCTL
4280 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4281 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4282#endif
4283 if (net != &init_net) {
4284 kfree(net->ipv6.devconf_dflt);
4285 kfree(net->ipv6.devconf_all);
4286 }
4287}
4288
4289static struct pernet_operations addrconf_ops = {
4290 .init = addrconf_init_net,
4291 .exit = addrconf_exit_net,
4292};
4293
1da177e4
LT		 4294/*
4295 * Device notifier
4296 */
4297
4298int register_inet6addr_notifier(struct notifier_block *nb)
4299{
1ab1457c 4300 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4301}
4302
7159039a
YH		 4303EXPORT_SYMBOL(register_inet6addr_notifier);
4304
1da177e4
LT		 4305int unregister_inet6addr_notifier(struct notifier_block *nb)
4306{
1ab1457c 4307 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4308}
4309
7159039a
YH		 4310EXPORT_SYMBOL(unregister_inet6addr_notifier);
4311
af284937
DL		 4312
4313static int addrconf_net_init(struct net *net)
4314{
4315 return 0;
4316}
4317
4318static void addrconf_net_exit(struct net *net)
4319{
6fda7350
BT		 4320 struct net_device *dev;
4321
6fda7350
BT		 4322 rtnl_lock();
4323 /* clean dev list */
4324 for_each_netdev(net, dev) {
4325 if (__in6_dev_get(dev) == NULL)
4326 continue;
4327 addrconf_ifdown(dev, 1);
4328 }
4329 addrconf_ifdown(net->loopback_dev, 2);
4330 rtnl_unlock();
af284937
DL		 4331}
4332
4333static struct pernet_operations addrconf_net_ops = {
4334 .init = addrconf_net_init,
4335 .exit = addrconf_net_exit,
4336};
4337
1da177e4
LT		 4338/*
4339 * Init / cleanup code
4340 */
4341
4342int __init addrconf_init(void)
4343{
2a8cc6c8
YH		 4344 int err;
4345
4346 if ((err = ipv6_addr_label_init()) < 0) {
4347 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4348 err);
4349 return err;
4350 }
1da177e4 4351
e0da5a48
PE		 4352 register_pernet_subsys(&addrconf_ops);
4353
1da177e4
LT		 4354 /* The addrconf netdev notifier requires that loopback_dev
4355 * has it's ipv6 private information allocated and setup
4356 * before it can bring up and give link-local addresses
4357 * to other devices which are up.
4358 *
4359 * Unfortunately, loopback_dev is not necessarily the first
4360 * entry in the global dev_base list of net devices. In fact,
4361 * it is likely to be the very last entry on that list.
4362 * So this causes the notifier registry below to try and
4363 * give link-local addresses to all devices besides loopback_dev
4364 * first, then loopback_dev, which cases all the non-loopback_dev
4365 * devices to fail to get a link-local address.
4366 *
4367 * So, as a temporary fix, allocate the ipv6 structure for
4368 * loopback_dev first by hand.
4369 * Longer term, all of the dependencies ipv6 has upon the loopback
4370 * device and it being up should be removed.
4371 */
4372 rtnl_lock();
2774c7ab 4373 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4374 err = -ENOMEM;
4375 rtnl_unlock();
4376 if (err)
e0da5a48 4377 goto errlo;
1da177e4 4378
af284937
DL		 4379 err = register_pernet_device(&addrconf_net_ops);
4380 if (err)
4381 return err;
4382
1da177e4
LT		 4383 register_netdevice_notifier(&ipv6_dev_notf);
4384
1da177e4 4385 addrconf_verify(0);
c127ea2c
TG		 4386
4387 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4388 if (err < 0)
4389 goto errout;
4390
4391 /* Only the first call to __rtnl_register can fail */
4392 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4393 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4394 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4395 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4396 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4397
2a8cc6c8
YH		 4398 ipv6_addr_label_rtnl_register();
4399
1da177e4 4400 return 0;
c127ea2c
TG		 4401errout:
4402 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4403errlo:
4404 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4405
4406 return err;
1da177e4
LT		 4407}
4408
09f7709f 4409void addrconf_cleanup(void)
1da177e4 4410{
1ab1457c 4411 struct inet6_ifaddr *ifa;
1da177e4
LT		 4412 int i;
4413
4414 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4415 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4416
e0da5a48 4417 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4418
4419 rtnl_lock();
4420
1da177e4
LT		 4421 /*
4422 * Check hash table.
4423 */
1da177e4
LT		 4424 write_lock_bh(&addrconf_hash_lock);
4425 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4426 for (ifa=inet6_addr_lst[i]; ifa; ) {
4427 struct inet6_ifaddr *bifa;
4428
4429 bifa = ifa;
4430 ifa = ifa->lst_next;
4431 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4432 /* Do not free it; something is wrong.
4433 Now we can investigate it with debugger.
4434 */
4435 }
4436 }
4437 write_unlock_bh(&addrconf_hash_lock);
4438
4439 del_timer(&addr_chk_timer);
1da177e4 4440 rtnl_unlock();
af284937
DL		 4441
4442 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4443}
Clone of davem's net-next-2.6 tree