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[IPV6]: Use bitfields for hop_limit and mcast_hops.
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
ab32ea5d 157struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 188};
189
ab32ea5d 190static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201#ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207#endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 209 .accept_ra_defrtr = 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216#endif
930d6ff2 217#endif
fbea49e1 218 .proxy_ndp = 0,
0bcbc926 219 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 220};
221
222/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 223const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
1da177e4
LT		 232static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233{
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236}
237
238enum addrconf_timer_t
239{
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243};
244
245static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248{
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263}
264
7f7d9a6b
HX		 265static int snmp6_alloc_dev(struct inet6_dev *idev)
266{
7f7d9a6b 267 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 268 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 271 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 272 goto err_icmp;
14878f75 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 274 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 275 goto err_icmpmsg;
7f7d9a6b
HX		 276
277 return 0;
278
14878f75
DS		 279err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 281err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283err_ip:
aaf70ec7 284 return -ENOMEM;
7f7d9a6b
HX		 285}
286
16910b98 287static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 288{
14878f75 289 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 292}
293
1da177e4
LT		 294/* Nobody refers to this device, we may destroy it. */
295
8814c4b5
YH		 296static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297{
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300}
301
1da177e4
LT		 302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
8814c4b5 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 317}
318
7159039a
YH		 319EXPORT_SYMBOL(in6_dev_finish_destroy);
320
1da177e4
LT		 321static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322{
323 struct inet6_dev *ndev;
d88ae4cc 324 struct in6_addr maddr;
1da177e4
LT		 325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
1ab1457c 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 332
1ab1457c
YH		 333 if (ndev == NULL)
334 return NULL;
322f74a4
IO		 335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
441fc2a2 338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
1da177e4 348
322f74a4
IO		 349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
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
415static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
1ab1457c 443
1da177e4
LT		 444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
1da177e4
LT		 452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457}
458
459
e186932b 460static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 461{
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
bff16c2f 466 for_each_netdev(net, dev) {
8814c4b5 467 rcu_read_lock();
1da177e4
LT		 468 idev = __in6_dev_get(dev);
469 if (idev) {
e186932b
PE		 470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
1da177e4
LT		 472 if (changed)
473 dev_forward_change(idev);
474 }
8814c4b5 475 rcu_read_unlock();
1da177e4
LT		 476 }
477 read_unlock(&dev_base_lock);
478}
c8fecf22
PE		 479
480static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481{
bff16c2f
PE		 482 struct net *net;
483
484 net = (struct net *)table->extra2;
441fc2a2 485 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 486 return;
487
e186932b
PE		 488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
c8fecf22
PE		 492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
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 */
6fda7350 564 if (ipv6_chk_same_addr(idev->dev->nd_net, addr, idev->dev)) {
1da177e4
LT		 565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
322f74a4 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
1da177e4
LT		 584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
57f5f544
KF		 594 ifa->rt = rt;
595
95c385b4
NH		 596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
1da177e4
LT		 606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
e55ffac6 621 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 622
623#ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629#endif
630
1da177e4
LT		 631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633out2:
8814c4b5 634 rcu_read_unlock_bh();
1da177e4 635
fd92833a 636 if (likely(err == 0))
e041c683 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647}
648
649/* This function wants to get referenced ifp and releases it before return */
650
651static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652{
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676#ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692#endif
693
1d142804 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
1d142804 702 continue;
1da177e4
LT		 703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
1d142804 726 ifap = &ifa->if_next;
1da177e4
LT		 727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
e041c683 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
6fda7350 754 struct net *net = ifp->idev->dev->nd_net;
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;
779 int tmp_plen;
780 int ret = 0;
781 int max_addresses;
95c385b4 782 u32 addr_flags;
1da177e4
LT		 783
784 write_lock(&idev->lock);
785 if (ift) {
786 spin_lock_bh(&ift->lock);
787 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788 spin_unlock_bh(&ift->lock);
789 tmpaddr = &addr;
790 } else {
791 tmpaddr = NULL;
792 }
793retry:
794 in6_dev_hold(idev);
795 if (idev->cnf.use_tempaddr <= 0) {
796 write_unlock(&idev->lock);
797 printk(KERN_INFO
798 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
799 in6_dev_put(idev);
800 ret = -1;
801 goto out;
802 }
803 spin_lock_bh(&ifp->lock);
804 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805 idev->cnf.use_tempaddr = -1; /*XXX*/
806 spin_unlock_bh(&ifp->lock);
807 write_unlock(&idev->lock);
808 printk(KERN_WARNING
809 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
810 in6_dev_put(idev);
811 ret = -1;
812 goto out;
813 }
814 in6_ifa_hold(ifp);
815 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817 spin_unlock_bh(&ifp->lock);
818 write_unlock(&idev->lock);
819 printk(KERN_WARNING
820 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
821 in6_ifa_put(ifp);
822 in6_dev_put(idev);
823 ret = -1;
824 goto out;
825 }
826 memcpy(&addr.s6_addr[8], idev->rndid, 8);
827 tmp_valid_lft = min_t(__u32,
828 ifp->valid_lft,
829 idev->cnf.temp_valid_lft);
1ab1457c
YH		 830 tmp_prefered_lft = min_t(__u32,
831 ifp->prefered_lft,
1da177e4
LT		 832 idev->cnf.temp_prefered_lft - desync_factor / HZ);
833 tmp_plen = ifp->prefix_len;
834 max_addresses = idev->cnf.max_addresses;
835 tmp_cstamp = ifp->cstamp;
836 tmp_tstamp = ifp->tstamp;
837 spin_unlock_bh(&ifp->lock);
838
839 write_unlock(&idev->lock);
95c385b4
NH		 840
841 addr_flags = IFA_F_TEMPORARY;
842 /* set in addrconf_prefix_rcv() */
843 if (ifp->flags & IFA_F_OPTIMISTIC)
844 addr_flags |= IFA_F_OPTIMISTIC;
845
1da177e4 846 ift = !max_addresses ||
1ab1457c 847 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 848 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 849 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
850 addr_flags) : NULL;
1da177e4
LT		 851 if (!ift || IS_ERR(ift)) {
852 in6_ifa_put(ifp);
853 in6_dev_put(idev);
854 printk(KERN_INFO
855 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
856 tmpaddr = &addr;
857 write_lock(&idev->lock);
858 goto retry;
859 }
860
861 spin_lock_bh(&ift->lock);
862 ift->ifpub = ifp;
863 ift->valid_lft = tmp_valid_lft;
864 ift->prefered_lft = tmp_prefered_lft;
865 ift->cstamp = tmp_cstamp;
866 ift->tstamp = tmp_tstamp;
867 spin_unlock_bh(&ift->lock);
868
869 addrconf_dad_start(ift, 0);
870 in6_ifa_put(ift);
871 in6_dev_put(idev);
872out:
873 return ret;
874}
875#endif
876
877/*
072047e4 878 * Choose an appropriate source address (RFC3484)
1da177e4 879 */
a9b05723
YH		 880enum {
881 IPV6_SADDR_RULE_INIT = 0,
882 IPV6_SADDR_RULE_LOCAL,
883 IPV6_SADDR_RULE_SCOPE,
884 IPV6_SADDR_RULE_PREFERRED,
885#ifdef CONFIG_IPV6_MIP6
886 IPV6_SADDR_RULE_HOA,
887#endif
888 IPV6_SADDR_RULE_OIF,
889 IPV6_SADDR_RULE_LABEL,
890#ifdef CONFIG_IPV6_PRIVACY
891 IPV6_SADDR_RULE_PRIVACY,
892#endif
893 IPV6_SADDR_RULE_ORCHID,
894 IPV6_SADDR_RULE_PREFIX,
895 IPV6_SADDR_RULE_MAX
896};
897
072047e4 898struct ipv6_saddr_score {
a9b05723
YH		 899 int rule;
900 int addr_type;
901 struct inet6_ifaddr *ifa;
902 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
903 int scopedist;
904 int matchlen;
072047e4
YH		 905};
906
a9b05723
YH		 907struct ipv6_saddr_dst {
908 struct in6_addr *addr;
909 int ifindex;
910 int scope;
911 int label;
912};
072047e4 913
b6f99a21 914static inline int ipv6_saddr_preferred(int type)
1da177e4 915{
072047e4
YH		 916 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
917 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
918 return 1;
919 return 0;
1da177e4
LT		 920}
921
a9b05723
YH		 922static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
923 struct ipv6_saddr_dst *dst,
924 int i)
925{
926 int ret;
927
928 if (i <= score->rule) {
929 switch (i) {
930 case IPV6_SADDR_RULE_SCOPE:
931 ret = score->scopedist;
932 break;
933 case IPV6_SADDR_RULE_PREFIX:
934 ret = score->matchlen;
935 break;
936 default:
937 ret = !!test_bit(i, score->scorebits);
938 }
939 goto out;
940 }
941
942 switch (i) {
943 case IPV6_SADDR_RULE_INIT:
944 /* Rule 0: remember if hiscore is not ready yet */
945 ret = !!score->ifa;
946 break;
947 case IPV6_SADDR_RULE_LOCAL:
948 /* Rule 1: Prefer same address */
949 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
950 break;
951 case IPV6_SADDR_RULE_SCOPE:
952 /* Rule 2: Prefer appropriate scope
953 *
954 * ret
955 * ^
956 * -1 | d 15
957 * ---+--+-+---> scope
958 * |
959 * | d is scope of the destination.
960 * B-d | \
961 * | \ <- smaller scope is better if
962 * B-15 | \ if scope is enough for destinaion.
963 * | ret = B - scope (-1 <= scope >= d <= 15).
964 * d-C-1 | /
965 * |/ <- greater is better
966 * -C / if scope is not enough for destination.
967 * /| ret = scope - C (-1 <= d < scope <= 15).
968 *
969 * d - C - 1 < B -15 (for all -1 <= d <= 15).
970 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
971 * Assume B = 0 and we get C > 29.
972 */
973 ret = __ipv6_addr_src_scope(score->addr_type);
974 if (ret >= dst->scope)
975 ret = -ret;
976 else
977 ret -= 128; /* 30 is enough */
978 score->scopedist = ret;
979 break;
980 case IPV6_SADDR_RULE_PREFERRED:
981 /* Rule 3: Avoid deprecated and optimistic addresses */
982 ret = ipv6_saddr_preferred(score->addr_type) ||
983 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
984 break;
985#ifdef CONFIG_IPV6_MIP6
986 case IPV6_SADDR_RULE_HOA:
987 /* Rule 4: Prefer home address */
988 ret = !!(score->ifa->flags & IFA_F_HOMEADDRESS);
989 break;
990#endif
991 case IPV6_SADDR_RULE_OIF:
992 /* Rule 5: Prefer outgoing interface */
993 ret = (!dst->ifindex ||
994 dst->ifindex == score->ifa->idev->dev->ifindex);
995 break;
996 case IPV6_SADDR_RULE_LABEL:
997 /* Rule 6: Prefer matching label */
998 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
999 score->ifa->idev->dev->ifindex) == dst->label;
1000 break;
1001#ifdef CONFIG_IPV6_PRIVACY
1002 case IPV6_SADDR_RULE_PRIVACY:
1003 /* Rule 7: Prefer public address
1004 * Note: prefer temprary address if use_tempaddr >= 2
1005 */
1006 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ (score->ifa->idev->cnf.use_tempaddr >= 2);
1007 break;
1008#endif
1009 case IPV6_SADDR_RULE_ORCHID:
1010 /* Rule 8-: Prefer ORCHID vs ORCHID or
1011 * non-ORCHID vs non-ORCHID
1012 */
1013 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1014 ipv6_addr_orchid(dst->addr));
1015 break;
1016 case IPV6_SADDR_RULE_PREFIX:
1017 /* Rule 8: Use longest matching prefix */
1018 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1019 dst->addr);
1020 break;
1021 default:
1022 ret = 0;
1023 }
1024
1025 if (ret)
1026 __set_bit(i, score->scorebits);
1027 score->rule = i;
1028out:
1029 return ret;
1030}
1031
1032int ipv6_dev_get_saddr(struct net_device *dst_dev,
1da177e4
LT		 1033 struct in6_addr *daddr, struct in6_addr *saddr)
1034{
a9b05723
YH		 1035 struct ipv6_saddr_score scores[2],
1036 *score = &scores[0], *hiscore = &scores[1];
1037 struct net *net = dst_dev->nd_net;
1038 struct ipv6_saddr_dst dst;
072047e4 1039 struct net_device *dev;
a9b05723 1040 int dst_type;
1da177e4 1041
a9b05723
YH		 1042 dst_type = __ipv6_addr_type(daddr);
1043 dst.addr = daddr;
1044 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1045 dst.scope = __ipv6_addr_src_scope(dst_type);
1046 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1047
1048 hiscore->rule = -1;
1049 hiscore->ifa = NULL;
1da177e4 1050
072047e4 1051 read_lock(&dev_base_lock);
8814c4b5 1052 rcu_read_lock();
1da177e4 1053
6fda7350 1054 for_each_netdev(net, dev) {
072047e4 1055 struct inet6_dev *idev;
072047e4 1056
a9b05723 1057 /* Candidate Source Address (section 4)
072047e4
YH		 1058 * - multicast and link-local destination address,
1059 * the set of candidate source address MUST only
1060 * include addresses assigned to interfaces
1061 * belonging to the same link as the outgoing
1062 * interface.
1063 * (- For site-local destination addresses, the
1064 * set of candidate source addresses MUST only
1065 * include addresses assigned to interfaces
1066 * belonging to the same site as the outgoing
1067 * interface.)
1068 */
a9b05723
YH		 1069 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1070 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1071 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1072 continue;
1da177e4 1073
1da177e4 1074 idev = __in6_dev_get(dev);
072047e4
YH		 1075 if (!idev)
1076 continue;
1077
1078 read_lock_bh(&idev->lock);
a9b05723
YH		 1079 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1080 int i;
072047e4 1081
a9b05723 1082 /*
6b3ae80a
YH		 1083 * - Tentative Address (RFC2462 section 5.4)
1084 * - A tentative address is not considered
1085 * "assigned to an interface" in the traditional
95c385b4 1086 * sense, unless it is also flagged as optimistic.
6b3ae80a 1087 * - Candidate Source Address (section 4)
072047e4
YH		 1088 * - In any case, anycast addresses, multicast
1089 * addresses, and the unspecified address MUST
1090 * NOT be included in a candidate set.
1091 */
a9b05723
YH		 1092 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1093 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1094 continue;
a9b05723
YH		 1095
1096 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1097
1098 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1099 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1100 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1101 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1102 "assigned as unicast address on %s",
1103 dev->name);
1104 continue;
1105 }
1106
a9b05723
YH		 1107 score->rule = -1;
1108 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1109
1110 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1111 int minihiscore, miniscore;
1112
1113 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1114 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1115
1116 if (minihiscore > miniscore) {
1117 if (i == IPV6_SADDR_RULE_SCOPE &&
1118 score->scopedist > 0) {
1119 /*
1120 * special case:
1121 * each remaining entry
1122 * has too small (not enough)
1123 * scope, because ifa entries
1124 * are sorted by their scope
1125 * values.
1126 */
1127 goto try_nextdev;
1128 }
1129 break;
1130 } else if (minihiscore < miniscore) {
1131 struct ipv6_saddr_score *tmp;
1132
1133 if (hiscore->ifa)
1134 in6_ifa_put(hiscore->ifa);
1135
1136 in6_ifa_hold(score->ifa);
1137
1138 tmp = hiscore;
1139 hiscore = score;
1140 score = tmp;
1141
1142 /* restore our iterator */
1143 score->ifa = hiscore->ifa;
1144
1145 break;
1da177e4 1146 }
072047e4 1147 }
1da177e4 1148 }
a9b05723 1149try_nextdev:
072047e4 1150 read_unlock_bh(&idev->lock);
1da177e4 1151 }
8814c4b5 1152 rcu_read_unlock();
1da177e4
LT		 1153 read_unlock(&dev_base_lock);
1154
a9b05723 1155 if (!hiscore->ifa)
072047e4 1156 return -EADDRNOTAVAIL;
1ab1457c 1157
a9b05723
YH		 1158 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1159 in6_ifa_put(hiscore->ifa);
072047e4 1160 return 0;
1da177e4
LT		 1161}
1162
5e5f3f0f 1163EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1164
95c385b4
NH		 1165int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1166 unsigned char banned_flags)
1da177e4
LT		 1167{
1168 struct inet6_dev *idev;
1169 int err = -EADDRNOTAVAIL;
1170
8814c4b5 1171 rcu_read_lock();
1da177e4
LT		 1172 if ((idev = __in6_dev_get(dev)) != NULL) {
1173 struct inet6_ifaddr *ifp;
1174
1175 read_lock_bh(&idev->lock);
1176 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1177 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1178 ipv6_addr_copy(addr, &ifp->addr);
1179 err = 0;
1180 break;
1181 }
1182 }
1183 read_unlock_bh(&idev->lock);
1184 }
8814c4b5 1185 rcu_read_unlock();
1da177e4
LT		 1186 return err;
1187}
1188
1189static int ipv6_count_addresses(struct inet6_dev *idev)
1190{
1191 int cnt = 0;
1192 struct inet6_ifaddr *ifp;
1193
1194 read_lock_bh(&idev->lock);
1195 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1196 cnt++;
1197 read_unlock_bh(&idev->lock);
1198 return cnt;
1199}
1200
bfeade08
DL		 1201int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1202 struct net_device *dev, int strict)
1da177e4
LT		 1203{
1204 struct inet6_ifaddr * ifp;
1205 u8 hash = ipv6_addr_hash(addr);
1206
1207 read_lock_bh(&addrconf_hash_lock);
1208 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
bfeade08
DL		 1209 if (ifp->idev->dev->nd_net != net)
1210 continue;
1da177e4
LT		 1211 if (ipv6_addr_equal(&ifp->addr, addr) &&
1212 !(ifp->flags&IFA_F_TENTATIVE)) {
1213 if (dev == NULL || ifp->idev->dev == dev ||
1214 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1215 break;
1216 }
1217 }
1218 read_unlock_bh(&addrconf_hash_lock);
1219 return ifp != NULL;
1220}
7159039a
YH		 1221EXPORT_SYMBOL(ipv6_chk_addr);
1222
1da177e4 1223static
06bfe655
DL		 1224int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1225 struct net_device *dev)
1da177e4
LT		 1226{
1227 struct inet6_ifaddr * ifp;
1228 u8 hash = ipv6_addr_hash(addr);
1229
1230 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
06bfe655
DL		 1231 if (ifp->idev->dev->nd_net != net)
1232 continue;
1da177e4
LT		 1233 if (ipv6_addr_equal(&ifp->addr, addr)) {
1234 if (dev == NULL || ifp->idev->dev == dev)
1235 break;
1236 }
1237 }
1238 return ifp != NULL;
1239}
1240
1cab3da6
DL		 1241struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1242 struct net_device *dev, int strict)
1da177e4
LT		 1243{
1244 struct inet6_ifaddr * ifp;
1245 u8 hash = ipv6_addr_hash(addr);
1246
1247 read_lock_bh(&addrconf_hash_lock);
1248 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1cab3da6
DL		 1249 if (ifp->idev->dev->nd_net != net)
1250 continue;
1da177e4
LT		 1251 if (ipv6_addr_equal(&ifp->addr, addr)) {
1252 if (dev == NULL || ifp->idev->dev == dev ||
1253 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1254 in6_ifa_hold(ifp);
1255 break;
1256 }
1257 }
1258 }
1259 read_unlock_bh(&addrconf_hash_lock);
1260
1261 return ifp;
1262}
1263
1264int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1265{
1266 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1267 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1268 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1269 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1270 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1271 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1272 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1273 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1274
1275 if (!sk2_rcv_saddr && !sk_ipv6only)
1276 return 1;
1277
1278 if (addr_type2 == IPV6_ADDR_ANY &&
1279 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1280 return 1;
1281
1282 if (addr_type == IPV6_ADDR_ANY &&
1283 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1284 return 1;
1285
1286 if (sk2_rcv_saddr6 &&
1287 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1288 return 1;
1289
1290 if (addr_type == IPV6_ADDR_MAPPED &&
1291 !sk2_ipv6only &&
1292 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1293 return 1;
1294
1295 return 0;
1296}
1297
1298/* Gets referenced address, destroys ifaddr */
1299
9f5336e2 1300static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1301{
1da177e4
LT		 1302 if (ifp->flags&IFA_F_PERMANENT) {
1303 spin_lock_bh(&ifp->lock);
1304 addrconf_del_timer(ifp);
1305 ifp->flags |= IFA_F_TENTATIVE;
1306 spin_unlock_bh(&ifp->lock);
1307 in6_ifa_put(ifp);
1308#ifdef CONFIG_IPV6_PRIVACY
1309 } else if (ifp->flags&IFA_F_TEMPORARY) {
1310 struct inet6_ifaddr *ifpub;
1311 spin_lock_bh(&ifp->lock);
1312 ifpub = ifp->ifpub;
1313 if (ifpub) {
1314 in6_ifa_hold(ifpub);
1315 spin_unlock_bh(&ifp->lock);
1316 ipv6_create_tempaddr(ifpub, ifp);
1317 in6_ifa_put(ifpub);
1318 } else {
1319 spin_unlock_bh(&ifp->lock);
1320 }
1321 ipv6_del_addr(ifp);
1322#endif
1323 } else
1324 ipv6_del_addr(ifp);
1325}
1326
3c21edbd
YH		 1327void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1328{
1329 if (net_ratelimit())
1330 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1331 addrconf_dad_stop(ifp);
1332}
1da177e4
LT		 1333
1334/* Join to solicited addr multicast group. */
1335
1336void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1337{
1338 struct in6_addr maddr;
1339
1340 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1341 return;
1342
1343 addrconf_addr_solict_mult(addr, &maddr);
1344 ipv6_dev_mc_inc(dev, &maddr);
1345}
1346
1347void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1348{
1349 struct in6_addr maddr;
1350
1351 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1352 return;
1353
1354 addrconf_addr_solict_mult(addr, &maddr);
1355 __ipv6_dev_mc_dec(idev, &maddr);
1356}
1357
20380731 1358static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1359{
1360 struct in6_addr addr;
1361 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1362 if (ipv6_addr_any(&addr))
1363 return;
1364 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1365}
1366
20380731 1367static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1368{
1369 struct in6_addr addr;
1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371 if (ipv6_addr_any(&addr))
1372 return;
1373 __ipv6_dev_ac_dec(ifp->idev, &addr);
1374}
1375
073a8e0e
YH		 1376static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1377{
1378 if (dev->addr_len != ETH_ALEN)
1379 return -1;
1380 memcpy(eui, dev->dev_addr, 3);
1381 memcpy(eui + 5, dev->dev_addr + 3, 3);
1382
1383 /*
1384 * The zSeries OSA network cards can be shared among various
1385 * OS instances, but the OSA cards have only one MAC address.
1386 * This leads to duplicate address conflicts in conjunction
1387 * with IPv6 if more than one instance uses the same card.
1388 *
1389 * The driver for these cards can deliver a unique 16-bit
1390 * identifier for each instance sharing the same card. It is
1391 * placed instead of 0xFFFE in the interface identifier. The
1392 * "u" bit of the interface identifier is not inverted in this
1393 * case. Hence the resulting interface identifier has local
1394 * scope according to RFC2373.
1395 */
1396 if (dev->dev_id) {
1397 eui[3] = (dev->dev_id >> 8) & 0xFF;
1398 eui[4] = dev->dev_id & 0xFF;
1399 } else {
1400 eui[3] = 0xFF;
1401 eui[4] = 0xFE;
1402 eui[0] ^= 2;
1403 }
1404 return 0;
1405}
1406
1407static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1408{
1409 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1410 if (dev->addr_len != ARCNET_ALEN)
1411 return -1;
1412 memset(eui, 0, 7);
1413 eui[7] = *(u8*)dev->dev_addr;
1414 return 0;
1415}
1416
1417static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1418{
1419 if (dev->addr_len != INFINIBAND_ALEN)
1420 return -1;
1421 memcpy(eui, dev->dev_addr + 12, 8);
1422 eui[0] |= 2;
1423 return 0;
1424}
1425
1da177e4
LT		 1426static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1427{
1428 switch (dev->type) {
1429 case ARPHRD_ETHER:
1430 case ARPHRD_FDDI:
1431 case ARPHRD_IEEE802_TR:
073a8e0e 1432 return addrconf_ifid_eui48(eui, dev);
1da177e4 1433 case ARPHRD_ARCNET:
073a8e0e 1434 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1435 case ARPHRD_INFINIBAND:
073a8e0e 1436 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1437 case ARPHRD_SIT:
1438 if (dev->priv_flags & IFF_ISATAP)
1439 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1440 }
1441 return -1;
1442}
1443
1444static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1445{
1446 int err = -1;
1447 struct inet6_ifaddr *ifp;
1448
1449 read_lock_bh(&idev->lock);
1450 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1451 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1452 memcpy(eui, ifp->addr.s6_addr+8, 8);
1453 err = 0;
1454 break;
1455 }
1456 }
1457 read_unlock_bh(&idev->lock);
1458 return err;
1459}
1460
1461#ifdef CONFIG_IPV6_PRIVACY
1462/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1463static int __ipv6_regen_rndid(struct inet6_dev *idev)
1464{
1da177e4 1465regen:
955189ef 1466 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1467 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1468
1469 /*
1470 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1471 * check if generated address is not inappropriate
1472 *
1473 * - Reserved subnet anycast (RFC 2526)
1474 * 11111101 11....11 1xxxxxxx
c7dc89c0 1475 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1476 * 00-00-5E-FE-xx-xx-xx-xx
1477 * - value 0
1478 * - XXX: already assigned to an address on the device
1479 */
1ab1457c 1480 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1481 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1482 (idev->rndid[7]&0x80))
1483 goto regen;
1484 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1485 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1486 goto regen;
1487 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1488 goto regen;
1489 }
1490
1491 return 0;
1492}
1493
1494static void ipv6_regen_rndid(unsigned long data)
1495{
1496 struct inet6_dev *idev = (struct inet6_dev *) data;
1497 unsigned long expires;
1498
8814c4b5 1499 rcu_read_lock_bh();
1da177e4
LT		 1500 write_lock_bh(&idev->lock);
1501
1502 if (idev->dead)
1503 goto out;
1504
1505 if (__ipv6_regen_rndid(idev) < 0)
1506 goto out;
1ab1457c 1507
1da177e4 1508 expires = jiffies +
1ab1457c 1509 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1510 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1511 if (time_before(expires, jiffies)) {
1512 printk(KERN_WARNING
1513 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1514 idev->dev->name);
1515 goto out;
1516 }
1517
1518 if (!mod_timer(&idev->regen_timer, expires))
1519 in6_dev_hold(idev);
1520
1521out:
1522 write_unlock_bh(&idev->lock);
8814c4b5 1523 rcu_read_unlock_bh();
1da177e4
LT		 1524 in6_dev_put(idev);
1525}
1526
1527static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1528 int ret = 0;
1529
1530 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1531 ret = __ipv6_regen_rndid(idev);
1532 return ret;
1533}
1534#endif
1535
1536/*
1537 * Add prefix route.
1538 */
1539
1540static void
1541addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1542 unsigned long expires, u32 flags)
1da177e4 1543{
86872cb5
TG		 1544 struct fib6_config cfg = {
1545 .fc_table = RT6_TABLE_PREFIX,
1546 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1547 .fc_ifindex = dev->ifindex,
1548 .fc_expires = expires,
1549 .fc_dst_len = plen,
1550 .fc_flags = RTF_UP | flags,
6fda7350 1551 .fc_nlinfo.nl_net = dev->nd_net,
86872cb5 1552 };
1da177e4 1553
86872cb5 1554 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1555
1556 /* Prevent useless cloning on PtP SIT.
1557 This thing is done here expecting that the whole
1558 class of non-broadcast devices need not cloning.
1559 */
0be669bb 1560#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1561 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1562 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1563#endif
1da177e4 1564
86872cb5 1565 ip6_route_add(&cfg);
1da177e4
LT		 1566}
1567
1568/* Create "default" multicast route to the interface */
1569
1570static void addrconf_add_mroute(struct net_device *dev)
1571{
86872cb5
TG		 1572 struct fib6_config cfg = {
1573 .fc_table = RT6_TABLE_LOCAL,
1574 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1575 .fc_ifindex = dev->ifindex,
1576 .fc_dst_len = 8,
1577 .fc_flags = RTF_UP,
6fda7350 1578 .fc_nlinfo.nl_net = dev->nd_net,
86872cb5
TG		 1579 };
1580
1581 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1582
1583 ip6_route_add(&cfg);
1da177e4
LT		 1584}
1585
0be669bb 1586#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1587static void sit_route_add(struct net_device *dev)
1588{
86872cb5
TG		 1589 struct fib6_config cfg = {
1590 .fc_table = RT6_TABLE_MAIN,
1591 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1592 .fc_ifindex = dev->ifindex,
1593 .fc_dst_len = 96,
1594 .fc_flags = RTF_UP | RTF_NONEXTHOP,
6fda7350 1595 .fc_nlinfo.nl_net = dev->nd_net,
86872cb5 1596 };
1da177e4
LT		 1597
1598 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1599 ip6_route_add(&cfg);
1da177e4 1600}
0be669bb 1601#endif
1da177e4
LT		 1602
1603static void addrconf_add_lroute(struct net_device *dev)
1604{
1605 struct in6_addr addr;
1606
1607 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1608 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1609}
1610
1611static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1612{
1613 struct inet6_dev *idev;
1614
1615 ASSERT_RTNL();
1616
1617 if ((idev = ipv6_find_idev(dev)) == NULL)
1618 return NULL;
1619
1620 /* Add default multicast route */
1621 addrconf_add_mroute(dev);
1622
1623 /* Add link local route */
1624 addrconf_add_lroute(dev);
1625 return idev;
1626}
1627
1628void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1629{
1630 struct prefix_info *pinfo;
1631 __u32 valid_lft;
1632 __u32 prefered_lft;
1633 int addr_type;
1634 unsigned long rt_expires;
1635 struct inet6_dev *in6_dev;
1636
1637 pinfo = (struct prefix_info *) opt;
1ab1457c 1638
1da177e4
LT		 1639 if (len < sizeof(struct prefix_info)) {
1640 ADBG(("addrconf: prefix option too short\n"));
1641 return;
1642 }
1ab1457c 1643
1da177e4
LT		 1644 /*
1645 * Validation checks ([ADDRCONF], page 19)
1646 */
1647
1648 addr_type = ipv6_addr_type(&pinfo->prefix);
1649
1650 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1651 return;
1652
1653 valid_lft = ntohl(pinfo->valid);
1654 prefered_lft = ntohl(pinfo->prefered);
1655
1656 if (prefered_lft > valid_lft) {
1657 if (net_ratelimit())
1658 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1659 return;
1660 }
1661
1662 in6_dev = in6_dev_get(dev);
1663
1664 if (in6_dev == NULL) {
1665 if (net_ratelimit())
1666 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1667 return;
1668 }
1669
1670 /*
1671 * Two things going on here:
1672 * 1) Add routes for on-link prefixes
1673 * 2) Configure prefixes with the auto flag set
1674 */
1675
1676 /* Avoid arithmetic overflow. Really, we could
1677 save rt_expires in seconds, likely valid_lft,
1678 but it would require division in fib gc, that it
1679 not good.
1680 */
1681 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1682 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1683 else
3dd4bc68
YH		 1684 rt_expires = valid_lft * HZ;
1685
1686 /*
1687 * We convert this (in jiffies) to clock_t later.
1688 * Avoid arithmetic overflow there as well.
1689 * Overflow can happen only if HZ < USER_HZ.
1690 */
1691 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1692 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1693
1694 if (pinfo->onlink) {
1695 struct rt6_info *rt;
6fda7350
BT		 1696 rt = rt6_lookup(dev->nd_net, &pinfo->prefix, NULL,
1697 dev->ifindex, 1);
1da177e4
LT		 1698
1699 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1700 if (rt->rt6i_flags&RTF_EXPIRES) {
1701 if (valid_lft == 0) {
e0a1ad73 1702 ip6_del_rt(rt);
1da177e4
LT		 1703 rt = NULL;
1704 } else {
3dd4bc68 1705 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1706 }
1707 }
1708 } else if (valid_lft) {
1709 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1710 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1711 }
1712 if (rt)
1713 dst_release(&rt->u.dst);
1714 }
1715
1716 /* Try to figure out our local address for this prefix */
1717
1718 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1719 struct inet6_ifaddr * ifp;
1720 struct in6_addr addr;
1721 int create = 0, update_lft = 0;
1722
1723 if (pinfo->prefix_len == 64) {
1724 memcpy(&addr, &pinfo->prefix, 8);
1725 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1726 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1727 in6_dev_put(in6_dev);
1728 return;
1729 }
1730 goto ok;
1731 }
1732 if (net_ratelimit())
1733 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1734 pinfo->prefix_len);
1735 in6_dev_put(in6_dev);
1736 return;
1737
1738ok:
1739
6fda7350 1740 ifp = ipv6_get_ifaddr(dev->nd_net, &addr, dev, 1);
1da177e4
LT		 1741
1742 if (ifp == NULL && valid_lft) {
1743 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1744 u32 addr_flags = 0;
1745
1746#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1747 if (in6_dev->cnf.optimistic_dad &&
1748 !ipv6_devconf.forwarding)
1749 addr_flags = IFA_F_OPTIMISTIC;
1750#endif
1da177e4
LT		 1751
1752 /* Do not allow to create too much of autoconfigured
1753 * addresses; this would be too easy way to crash kernel.
1754 */
1755 if (!max_addresses ||
1756 ipv6_count_addresses(in6_dev) < max_addresses)
1757 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1758 addr_type&IPV6_ADDR_SCOPE_MASK,
1759 addr_flags);
1da177e4
LT		 1760
1761 if (!ifp || IS_ERR(ifp)) {
1762 in6_dev_put(in6_dev);
1763 return;
1764 }
1765
1766 update_lft = create = 1;
1767 ifp->cstamp = jiffies;
1768 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1769 }
1770
1771 if (ifp) {
1772 int flags;
1773 unsigned long now;
1774#ifdef CONFIG_IPV6_PRIVACY
1775 struct inet6_ifaddr *ift;
1776#endif
1777 u32 stored_lft;
1778
1779 /* update lifetime (RFC2462 5.5.3 e) */
1780 spin_lock(&ifp->lock);
1781 now = jiffies;
1782 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1783 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1784 else
1785 stored_lft = 0;
1786 if (!update_lft && stored_lft) {
1787 if (valid_lft > MIN_VALID_LIFETIME ||
1788 valid_lft > stored_lft)
1789 update_lft = 1;
1790 else if (stored_lft <= MIN_VALID_LIFETIME) {
1791 /* valid_lft <= stored_lft is always true */
1792 /* XXX: IPsec */
1793 update_lft = 0;
1794 } else {
1795 valid_lft = MIN_VALID_LIFETIME;
1796 if (valid_lft < prefered_lft)
1797 prefered_lft = valid_lft;
1798 update_lft = 1;
1799 }
1800 }
1801
1802 if (update_lft) {
1803 ifp->valid_lft = valid_lft;
1804 ifp->prefered_lft = prefered_lft;
1805 ifp->tstamp = now;
1806 flags = ifp->flags;
1807 ifp->flags &= ~IFA_F_DEPRECATED;
1808 spin_unlock(&ifp->lock);
1809
1810 if (!(flags&IFA_F_TENTATIVE))
1811 ipv6_ifa_notify(0, ifp);
1812 } else
1813 spin_unlock(&ifp->lock);
1814
1815#ifdef CONFIG_IPV6_PRIVACY
1816 read_lock_bh(&in6_dev->lock);
1817 /* update all temporary addresses in the list */
1818 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1819 /*
1820 * When adjusting the lifetimes of an existing
1821 * temporary address, only lower the lifetimes.
1822 * Implementations must not increase the
1823 * lifetimes of an existing temporary address
1824 * when processing a Prefix Information Option.
1825 */
1826 spin_lock(&ift->lock);
1827 flags = ift->flags;
1828 if (ift->valid_lft > valid_lft &&
1829 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1830 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1831 if (ift->prefered_lft > prefered_lft &&
1832 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1833 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1834 spin_unlock(&ift->lock);
1835 if (!(flags&IFA_F_TENTATIVE))
1836 ipv6_ifa_notify(0, ift);
1837 }
1838
1839 if (create && in6_dev->cnf.use_tempaddr > 0) {
1840 /*
1841 * When a new public address is created as described in [ADDRCONF],
1842 * also create a new temporary address.
1843 */
1ab1457c 1844 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1845 ipv6_create_tempaddr(ifp, NULL);
1846 } else {
1847 read_unlock_bh(&in6_dev->lock);
1848 }
1849#endif
1850 in6_ifa_put(ifp);
1851 addrconf_verify(0);
1852 }
1853 }
1854 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1855 in6_dev_put(in6_dev);
1856}
1857
1858/*
1859 * Set destination address.
1860 * Special case for SIT interfaces where we create a new "virtual"
1861 * device.
1862 */
af284937 1863int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 1864{
1865 struct in6_ifreq ireq;
1866 struct net_device *dev;
1867 int err = -EINVAL;
1868
1869 rtnl_lock();
1870
1871 err = -EFAULT;
1872 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1873 goto err_exit;
1874
af284937 1875 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 1876
1877 err = -ENODEV;
1878 if (dev == NULL)
1879 goto err_exit;
1880
0be669bb 1881#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1882 if (dev->type == ARPHRD_SIT) {
1883 struct ifreq ifr;
1884 mm_segment_t oldfs;
1885 struct ip_tunnel_parm p;
1886
1887 err = -EADDRNOTAVAIL;
1888 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1889 goto err_exit;
1890
1891 memset(&p, 0, sizeof(p));
1892 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1893 p.iph.saddr = 0;
1894 p.iph.version = 4;
1895 p.iph.ihl = 5;
1896 p.iph.protocol = IPPROTO_IPV6;
1897 p.iph.ttl = 64;
d20b3109 1898 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1899
1900 oldfs = get_fs(); set_fs(KERNEL_DS);
1901 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1902 set_fs(oldfs);
1903
1904 if (err == 0) {
1905 err = -ENOBUFS;
af284937
DL		 1906 dev = __dev_get_by_name(net, p.name);
1907 if (!dev)
1da177e4
LT		 1908 goto err_exit;
1909 err = dev_open(dev);
1910 }
1911 }
0be669bb 1912#endif
1da177e4
LT		 1913
1914err_exit:
1915 rtnl_unlock();
1916 return err;
1917}
1918
1919/*
1920 * Manual configuration of address on an interface
1921 */
af284937
DL		 1922static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1923 int plen, __u8 ifa_flags, __u32 prefered_lft,
1924 __u32 valid_lft)
1da177e4
LT		 1925{
1926 struct inet6_ifaddr *ifp;
1927 struct inet6_dev *idev;
1928 struct net_device *dev;
1929 int scope;
46d48046 1930 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1931
1932 ASSERT_RTNL();
1ab1457c 1933
0778769d
NT		 1934 /* check the lifetime */
1935 if (!valid_lft || prefered_lft > valid_lft)
1936 return -EINVAL;
1937
af284937
DL		 1938 dev = __dev_get_by_index(net, ifindex);
1939 if (!dev)
1da177e4 1940 return -ENODEV;
1ab1457c 1941
1da177e4
LT		 1942 if ((idev = addrconf_add_dev(dev)) == NULL)
1943 return -ENOBUFS;
1944
1945 scope = ipv6_addr_scope(pfx);
1946
46d48046 1947 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1948 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1949 flags = 0;
1950 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1951 valid_lft = 0x7FFFFFFF/HZ;
1952
1953 if (prefered_lft == 0)
1954 ifa_flags |= IFA_F_DEPRECATED;
1955 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1956 (prefered_lft != INFINITY_LIFE_TIME))
1957 prefered_lft = 0x7FFFFFFF/HZ;
1958
1959 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1960
1da177e4 1961 if (!IS_ERR(ifp)) {
06aebfb7 1962 spin_lock_bh(&ifp->lock);
0778769d
NT		 1963 ifp->valid_lft = valid_lft;
1964 ifp->prefered_lft = prefered_lft;
1965 ifp->tstamp = jiffies;
06aebfb7 1966 spin_unlock_bh(&ifp->lock);
0778769d 1967
46d48046
YH		 1968 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1969 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1970 /*
1971 * Note that section 3.1 of RFC 4429 indicates
1972 * that the Optimistic flag should not be set for
1973 * manually configured addresses
1974 */
1da177e4
LT		 1975 addrconf_dad_start(ifp, 0);
1976 in6_ifa_put(ifp);
0778769d 1977 addrconf_verify(0);
1da177e4
LT		 1978 return 0;
1979 }
1980
1981 return PTR_ERR(ifp);
1982}
1983
af284937
DL		 1984static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
1985 int plen)
1da177e4
LT		 1986{
1987 struct inet6_ifaddr *ifp;
1988 struct inet6_dev *idev;
1989 struct net_device *dev;
1ab1457c 1990
af284937
DL		 1991 dev = __dev_get_by_index(net, ifindex);
1992 if (!dev)
1da177e4
LT		 1993 return -ENODEV;
1994
1995 if ((idev = __in6_dev_get(dev)) == NULL)
1996 return -ENXIO;
1997
1998 read_lock_bh(&idev->lock);
1999 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2000 if (ifp->prefix_len == plen &&
2001 ipv6_addr_equal(pfx, &ifp->addr)) {
2002 in6_ifa_hold(ifp);
2003 read_unlock_bh(&idev->lock);
1ab1457c 2004
1da177e4
LT		 2005 ipv6_del_addr(ifp);
2006
2007 /* If the last address is deleted administratively,
2008 disable IPv6 on this interface.
2009 */
2010 if (idev->addr_list == NULL)
2011 addrconf_ifdown(idev->dev, 1);
2012 return 0;
2013 }
2014 }
2015 read_unlock_bh(&idev->lock);
2016 return -EADDRNOTAVAIL;
2017}
2018
2019
af284937 2020int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2021{
2022 struct in6_ifreq ireq;
2023 int err;
1ab1457c 2024
1da177e4
LT		 2025 if (!capable(CAP_NET_ADMIN))
2026 return -EPERM;
1ab1457c 2027
1da177e4
LT		 2028 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029 return -EFAULT;
2030
2031 rtnl_lock();
af284937
DL		 2032 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2033 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2034 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2035 rtnl_unlock();
2036 return err;
2037}
2038
af284937 2039int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2040{
2041 struct in6_ifreq ireq;
2042 int err;
1ab1457c 2043
1da177e4
LT		 2044 if (!capable(CAP_NET_ADMIN))
2045 return -EPERM;
2046
2047 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2048 return -EFAULT;
2049
2050 rtnl_lock();
af284937
DL		 2051 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2052 ireq.ifr6_prefixlen);
1da177e4
LT		 2053 rtnl_unlock();
2054 return err;
2055}
2056
0be669bb 2057#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2058static void sit_add_v4_addrs(struct inet6_dev *idev)
2059{
2060 struct inet6_ifaddr * ifp;
2061 struct in6_addr addr;
2062 struct net_device *dev;
6fda7350 2063 struct net *net = idev->dev->nd_net;
1da177e4
LT		 2064 int scope;
2065
2066 ASSERT_RTNL();
2067
2068 memset(&addr, 0, sizeof(struct in6_addr));
2069 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2070
2071 if (idev->dev->flags&IFF_POINTOPOINT) {
2072 addr.s6_addr32[0] = htonl(0xfe800000);
2073 scope = IFA_LINK;
2074 } else {
2075 scope = IPV6_ADDR_COMPATv4;
2076 }
2077
2078 if (addr.s6_addr32[3]) {
2079 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2080 if (!IS_ERR(ifp)) {
2081 spin_lock_bh(&ifp->lock);
2082 ifp->flags &= ~IFA_F_TENTATIVE;
2083 spin_unlock_bh(&ifp->lock);
2084 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2085 in6_ifa_put(ifp);
2086 }
2087 return;
2088 }
2089
6fda7350 2090 for_each_netdev(net, dev) {
e5ed6399 2091 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2092 if (in_dev && (dev->flags & IFF_UP)) {
2093 struct in_ifaddr * ifa;
2094
2095 int flag = scope;
2096
2097 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2098 int plen;
2099
2100 addr.s6_addr32[3] = ifa->ifa_local;
2101
2102 if (ifa->ifa_scope == RT_SCOPE_LINK)
2103 continue;
2104 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2105 if (idev->dev->flags&IFF_POINTOPOINT)
2106 continue;
2107 flag |= IFA_HOST;
2108 }
2109 if (idev->dev->flags&IFF_POINTOPOINT)
2110 plen = 64;
2111 else
2112 plen = 96;
2113
2114 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2115 IFA_F_PERMANENT);
2116 if (!IS_ERR(ifp)) {
2117 spin_lock_bh(&ifp->lock);
2118 ifp->flags &= ~IFA_F_TENTATIVE;
2119 spin_unlock_bh(&ifp->lock);
2120 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2121 in6_ifa_put(ifp);
2122 }
2123 }
2124 }
1ab1457c 2125 }
1da177e4 2126}
0be669bb 2127#endif
1da177e4
LT		 2128
2129static void init_loopback(struct net_device *dev)
2130{
2131 struct inet6_dev *idev;
2132 struct inet6_ifaddr * ifp;
2133
2134 /* ::1 */
2135
2136 ASSERT_RTNL();
2137
2138 if ((idev = ipv6_find_idev(dev)) == NULL) {
2139 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2140 return;
2141 }
2142
2143 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2144 if (!IS_ERR(ifp)) {
2145 spin_lock_bh(&ifp->lock);
2146 ifp->flags &= ~IFA_F_TENTATIVE;
2147 spin_unlock_bh(&ifp->lock);
2148 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2149 in6_ifa_put(ifp);
2150 }
2151}
2152
2153static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2154{
2155 struct inet6_ifaddr * ifp;
95c385b4
NH		 2156 u32 addr_flags = IFA_F_PERMANENT;
2157
2158#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2159 if (idev->cnf.optimistic_dad &&
2160 !ipv6_devconf.forwarding)
2161 addr_flags |= IFA_F_OPTIMISTIC;
2162#endif
1da177e4 2163
95c385b4
NH		 2164
2165 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2166 if (!IS_ERR(ifp)) {
46d48046 2167 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2168 addrconf_dad_start(ifp, 0);
2169 in6_ifa_put(ifp);
2170 }
2171}
2172
2173static void addrconf_dev_config(struct net_device *dev)
2174{
2175 struct in6_addr addr;
2176 struct inet6_dev * idev;
2177
2178 ASSERT_RTNL();
2179
74235a25
HX		 2180 if ((dev->type != ARPHRD_ETHER) &&
2181 (dev->type != ARPHRD_FDDI) &&
2182 (dev->type != ARPHRD_IEEE802_TR) &&
2183 (dev->type != ARPHRD_ARCNET) &&
2184 (dev->type != ARPHRD_INFINIBAND)) {
2185 /* Alas, we support only Ethernet autoconfiguration. */
2186 return;
2187 }
2188
1da177e4
LT		 2189 idev = addrconf_add_dev(dev);
2190 if (idev == NULL)
2191 return;
2192
2193 memset(&addr, 0, sizeof(struct in6_addr));
2194 addr.s6_addr32[0] = htonl(0xFE800000);
2195
2196 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2197 addrconf_add_linklocal(idev, &addr);
2198}
2199
0be669bb 2200#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2201static void addrconf_sit_config(struct net_device *dev)
2202{
2203 struct inet6_dev *idev;
2204
2205 ASSERT_RTNL();
2206
1ab1457c
YH		 2207 /*
2208 * Configure the tunnel with one of our IPv4
2209 * addresses... we should configure all of
1da177e4
LT		 2210 * our v4 addrs in the tunnel
2211 */
2212
2213 if ((idev = ipv6_find_idev(dev)) == NULL) {
2214 printk(KERN_DEBUG "init sit: add_dev failed\n");
2215 return;
2216 }
2217
c7dc89c0
FT		 2218 if (dev->priv_flags & IFF_ISATAP) {
2219 struct in6_addr addr;
2220
2221 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2222 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2223 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2224 addrconf_add_linklocal(idev, &addr);
2225 return;
2226 }
2227
1da177e4
LT		 2228 sit_add_v4_addrs(idev);
2229
2230 if (dev->flags&IFF_POINTOPOINT) {
2231 addrconf_add_mroute(dev);
2232 addrconf_add_lroute(dev);
2233 } else
2234 sit_route_add(dev);
2235}
0be669bb 2236#endif
1da177e4
LT		 2237
2238static inline int
2239ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2240{
2241 struct in6_addr lladdr;
2242
95c385b4 2243 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2244 addrconf_add_linklocal(idev, &lladdr);
2245 return 0;
2246 }
2247 return -1;
2248}
2249
2250static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2251{
2252 struct net_device *link_dev;
6fda7350 2253 struct net *net = idev->dev->nd_net;
1da177e4
LT		 2254
2255 /* first try to inherit the link-local address from the link device */
2256 if (idev->dev->iflink &&
6fda7350 2257 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2258 if (!ipv6_inherit_linklocal(idev, link_dev))
2259 return;
2260 }
2261 /* then try to inherit it from any device */
6fda7350 2262 for_each_netdev(net, link_dev) {
1da177e4
LT		 2263 if (!ipv6_inherit_linklocal(idev, link_dev))
2264 return;
2265 }
2266 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2267}
2268
2269/*
2270 * Autoconfigure tunnel with a link-local address so routing protocols,
2271 * DHCPv6, MLD etc. can be run over the virtual link
2272 */
2273
2274static void addrconf_ip6_tnl_config(struct net_device *dev)
2275{
2276 struct inet6_dev *idev;
2277
2278 ASSERT_RTNL();
2279
2280 if ((idev = addrconf_add_dev(dev)) == NULL) {
2281 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2282 return;
2283 }
2284 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2285}
2286
1ab1457c 2287static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2288 void * data)
2289{
2290 struct net_device *dev = (struct net_device *) data;
74235a25 2291 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2292 int run_pending = 0;
b217d616 2293 int err;
1da177e4
LT		 2294
2295 switch(event) {
45ba9dd2 2296 case NETDEV_REGISTER:
74235a25 2297 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2298 idev = ipv6_add_dev(dev);
2299 if (!idev)
b217d616 2300 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2301 }
2302 break;
1da177e4 2303 case NETDEV_UP:
3c21edbd 2304 case NETDEV_CHANGE:
c2edacf8
JV		 2305 if (dev->flags & IFF_SLAVE)
2306 break;
2307
3c21edbd 2308 if (event == NETDEV_UP) {
f24e3d65 2309 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2310 /* device is not ready yet. */
2311 printk(KERN_INFO
2312 "ADDRCONF(NETDEV_UP): %s: "
2313 "link is not ready\n",
2314 dev->name);
2315 break;
2316 }
99081049 2317
d31c7b8f
EP		 2318 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2319 idev = ipv6_add_dev(dev);
2320
99081049
KS		 2321 if (idev)
2322 idev->if_flags |= IF_READY;
3c21edbd 2323 } else {
f24e3d65 2324 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2325 /* device is still not ready. */
2326 break;
2327 }
2328
2329 if (idev) {
2330 if (idev->if_flags & IF_READY) {
2331 /* device is already configured. */
2332 break;
2333 }
2334 idev->if_flags |= IF_READY;
2335 }
2336
2337 printk(KERN_INFO
2338 "ADDRCONF(NETDEV_CHANGE): %s: "
2339 "link becomes ready\n",
2340 dev->name);
2341
c5e33bdd 2342 run_pending = 1;
3c21edbd
YH		 2343 }
2344
1da177e4 2345 switch(dev->type) {
0be669bb 2346#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2347 case ARPHRD_SIT:
2348 addrconf_sit_config(dev);
2349 break;
0be669bb 2350#endif
1da177e4
LT		 2351 case ARPHRD_TUNNEL6:
2352 addrconf_ip6_tnl_config(dev);
2353 break;
2354 case ARPHRD_LOOPBACK:
2355 init_loopback(dev);
2356 break;
2357
2358 default:
2359 addrconf_dev_config(dev);
2360 break;
3ff50b79 2361 }
1da177e4 2362 if (idev) {
c5e33bdd
YH		 2363 if (run_pending)
2364 addrconf_dad_run(idev);
2365
1da177e4
LT		 2366 /* If the MTU changed during the interface down, when the
2367 interface up, the changed MTU must be reflected in the
2368 idev as well as routers.
2369 */
2370 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2371 rt6_mtu_change(dev, dev->mtu);
2372 idev->cnf.mtu6 = dev->mtu;
2373 }
2374 idev->tstamp = jiffies;
2375 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2376 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2377 stop IPv6 on this interface.
2378 */
2379 if (dev->mtu < IPV6_MIN_MTU)
2380 addrconf_ifdown(dev, event != NETDEV_DOWN);
2381 }
2382 break;
2383
2384 case NETDEV_CHANGEMTU:
d31c7b8f 2385 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2386 rt6_mtu_change(dev, dev->mtu);
2387 idev->cnf.mtu6 = dev->mtu;
2388 break;
2389 }
2390
d31c7b8f
EP		 2391 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2392 idev = ipv6_add_dev(dev);
2393 if (idev)
2394 break;
2395 }
2396
1da177e4
LT		 2397 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2398
2399 case NETDEV_DOWN:
2400 case NETDEV_UNREGISTER:
2401 /*
2402 * Remove all addresses from this interface.
2403 */
2404 addrconf_ifdown(dev, event != NETDEV_DOWN);
2405 break;
3c21edbd 2406
1da177e4 2407 case NETDEV_CHANGENAME:
1da177e4 2408 if (idev) {
5632c515 2409 snmp6_unregister_dev(idev);
408c4768 2410 addrconf_sysctl_unregister(idev);
f52295a9 2411 addrconf_sysctl_register(idev);
b217d616
HX		 2412 err = snmp6_register_dev(idev);
2413 if (err)
2414 return notifier_from_errno(err);
5632c515 2415 }
1da177e4 2416 break;
3ff50b79 2417 }
1da177e4
LT		 2418
2419 return NOTIFY_OK;
2420}
2421
2422/*
2423 * addrconf module should be notified of a device going up
2424 */
2425static struct notifier_block ipv6_dev_notf = {
2426 .notifier_call = addrconf_notify,
2427 .priority = 0
2428};
2429
2430static int addrconf_ifdown(struct net_device *dev, int how)
2431{
2432 struct inet6_dev *idev;
2433 struct inet6_ifaddr *ifa, **bifa;
f3db4851 2434 struct net *net = dev->nd_net;
1da177e4
LT		 2435 int i;
2436
2437 ASSERT_RTNL();
2438
2774c7ab 2439 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2440 how = 0;
2441
f3db4851 2442 rt6_ifdown(net, dev);
1da177e4
LT		 2443 neigh_ifdown(&nd_tbl, dev);
2444
2445 idev = __in6_dev_get(dev);
2446 if (idev == NULL)
2447 return -ENODEV;
2448
2449 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2450 Do not dev_put!
1da177e4
LT		 2451 */
2452 if (how == 1) {
1da177e4 2453 idev->dead = 1;
8814c4b5
YH		 2454
2455 /* protected by rtnl_lock */
2456 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2457
2458 /* Step 1.5: remove snmp6 entry */
2459 snmp6_unregister_dev(idev);
2460
2461 }
2462
2463 /* Step 2: clear hash table */
2464 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2465 bifa = &inet6_addr_lst[i];
2466
2467 write_lock_bh(&addrconf_hash_lock);
2468 while ((ifa = *bifa) != NULL) {
2469 if (ifa->idev == idev) {
2470 *bifa = ifa->lst_next;
2471 ifa->lst_next = NULL;
2472 addrconf_del_timer(ifa);
2473 in6_ifa_put(ifa);
2474 continue;
2475 }
2476 bifa = &ifa->lst_next;
2477 }
2478 write_unlock_bh(&addrconf_hash_lock);
2479 }
2480
2481 write_lock_bh(&idev->lock);
2482
2483 /* Step 3: clear flags for stateless addrconf */
2484 if (how != 1)
3c21edbd 2485 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2486
2487 /* Step 4: clear address list */
2488#ifdef CONFIG_IPV6_PRIVACY
2489 if (how == 1 && del_timer(&idev->regen_timer))
2490 in6_dev_put(idev);
2491
2492 /* clear tempaddr list */
2493 while ((ifa = idev->tempaddr_list) != NULL) {
2494 idev->tempaddr_list = ifa->tmp_next;
2495 ifa->tmp_next = NULL;
2496 ifa->dead = 1;
2497 write_unlock_bh(&idev->lock);
2498 spin_lock_bh(&ifa->lock);
2499
2500 if (ifa->ifpub) {
2501 in6_ifa_put(ifa->ifpub);
2502 ifa->ifpub = NULL;
2503 }
2504 spin_unlock_bh(&ifa->lock);
2505 in6_ifa_put(ifa);
2506 write_lock_bh(&idev->lock);
2507 }
2508#endif
2509 while ((ifa = idev->addr_list) != NULL) {
2510 idev->addr_list = ifa->if_next;
2511 ifa->if_next = NULL;
2512 ifa->dead = 1;
2513 addrconf_del_timer(ifa);
2514 write_unlock_bh(&idev->lock);
2515
2516 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2517 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2518 in6_ifa_put(ifa);
2519
2520 write_lock_bh(&idev->lock);
2521 }
2522 write_unlock_bh(&idev->lock);
2523
2524 /* Step 5: Discard multicast list */
2525
2526 if (how == 1)
2527 ipv6_mc_destroy_dev(idev);
2528 else
2529 ipv6_mc_down(idev);
2530
1da177e4 2531 idev->tstamp = jiffies;
1ab1457c 2532
1da177e4
LT		 2533 /* Shot the device (if unregistered) */
2534
2535 if (how == 1) {
408c4768 2536 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2537 neigh_parms_release(&nd_tbl, idev->nd_parms);
2538 neigh_ifdown(&nd_tbl, dev);
2539 in6_dev_put(idev);
2540 }
2541 return 0;
2542}
2543
2544static void addrconf_rs_timer(unsigned long data)
2545{
2546 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2547
2548 if (ifp->idev->cnf.forwarding)
2549 goto out;
2550
2551 if (ifp->idev->if_flags & IF_RA_RCVD) {
2552 /*
2553 * Announcement received after solicitation
2554 * was sent
2555 */
2556 goto out;
2557 }
2558
2559 spin_lock(&ifp->lock);
2560 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2561 struct in6_addr all_routers;
2562
2563 /* The wait after the last probe can be shorter */
2564 addrconf_mod_timer(ifp, AC_RS,
2565 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2566 ifp->idev->cnf.rtr_solicit_delay :
2567 ifp->idev->cnf.rtr_solicit_interval);
2568 spin_unlock(&ifp->lock);
2569
2570 ipv6_addr_all_routers(&all_routers);
2571
2572 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2573 } else {
2574 spin_unlock(&ifp->lock);
2575 /*
2576 * Note: we do not support deprecated "all on-link"
2577 * assumption any longer.
2578 */
2579 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2580 ifp->idev->dev->name);
2581 }
2582
2583out:
2584 in6_ifa_put(ifp);
2585}
2586
2587/*
2588 * Duplicate Address Detection
2589 */
3c21edbd
YH		 2590static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2591{
2592 unsigned long rand_num;
2593 struct inet6_dev *idev = ifp->idev;
2594
95c385b4
NH		 2595 if (ifp->flags & IFA_F_OPTIMISTIC)
2596 rand_num = 0;
2597 else
2598 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2599
3c21edbd
YH		 2600 ifp->probes = idev->cnf.dad_transmits;
2601 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2602}
2603
e431b8c0 2604static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2605{
2606 struct inet6_dev *idev = ifp->idev;
2607 struct net_device *dev = idev->dev;
1da177e4
LT		 2608
2609 addrconf_join_solict(dev, &ifp->addr);
2610
1da177e4 2611 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2612
2613 read_lock_bh(&idev->lock);
2614 if (ifp->dead)
2615 goto out;
2616 spin_lock_bh(&ifp->lock);
2617
2618 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2619 !(ifp->flags&IFA_F_TENTATIVE) ||
2620 ifp->flags & IFA_F_NODAD) {
95c385b4 2621 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2622 spin_unlock_bh(&ifp->lock);
2623 read_unlock_bh(&idev->lock);
2624
2625 addrconf_dad_completed(ifp);
2626 return;
2627 }
2628
6732bade 2629 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2630 spin_unlock_bh(&ifp->lock);
6732bade 2631 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2632 /*
2633 * If the defice is not ready:
2634 * - keep it tentative if it is a permanent address.
2635 * - otherwise, kill it.
2636 */
2637 in6_ifa_hold(ifp);
2638 addrconf_dad_stop(ifp);
6732bade 2639 return;
3c21edbd 2640 }
95c385b4
NH		 2641
2642 /*
2643 * Optimistic nodes can start receiving
2644 * Frames right away
2645 */
2646 if(ifp->flags & IFA_F_OPTIMISTIC)
2647 ip6_ins_rt(ifp->rt);
2648
6732bade
YH		 2649 addrconf_dad_kick(ifp);
2650 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2651out:
2652 read_unlock_bh(&idev->lock);
2653}
2654
2655static void addrconf_dad_timer(unsigned long data)
2656{
2657 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2658 struct inet6_dev *idev = ifp->idev;
2659 struct in6_addr unspec;
2660 struct in6_addr mcaddr;
2661
2662 read_lock_bh(&idev->lock);
2663 if (idev->dead) {
2664 read_unlock_bh(&idev->lock);
2665 goto out;
2666 }
2667 spin_lock_bh(&ifp->lock);
2668 if (ifp->probes == 0) {
2669 /*
2670 * DAD was successful
2671 */
2672
95c385b4 2673 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2674 spin_unlock_bh(&ifp->lock);
2675 read_unlock_bh(&idev->lock);
2676
2677 addrconf_dad_completed(ifp);
2678
2679 goto out;
2680 }
2681
2682 ifp->probes--;
2683 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2684 spin_unlock_bh(&ifp->lock);
2685 read_unlock_bh(&idev->lock);
2686
2687 /* send a neighbour solicitation for our addr */
2688 memset(&unspec, 0, sizeof(unspec));
2689 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2690 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2691out:
2692 in6_ifa_put(ifp);
2693}
2694
2695static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2696{
2697 struct net_device * dev = ifp->idev->dev;
2698
2699 /*
2700 * Configure the address for reception. Now it is valid.
2701 */
2702
2703 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2704
2705 /* If added prefix is link local and forwarding is off,
2706 start sending router solicitations.
2707 */
2708
2709 if (ifp->idev->cnf.forwarding == 0 &&
2710 ifp->idev->cnf.rtr_solicits > 0 &&
2711 (dev->flags&IFF_LOOPBACK) == 0 &&
2712 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2713 struct in6_addr all_routers;
2714
2715 ipv6_addr_all_routers(&all_routers);
2716
2717 /*
2718 * If a host as already performed a random delay
2719 * [...] as part of DAD [...] there is no need
2720 * to delay again before sending the first RS
2721 */
2722 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2723
2724 spin_lock_bh(&ifp->lock);
2725 ifp->probes = 1;
2726 ifp->idev->if_flags |= IF_RS_SENT;
2727 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2728 spin_unlock_bh(&ifp->lock);
2729 }
2730}
2731
c5e33bdd
YH		 2732static void addrconf_dad_run(struct inet6_dev *idev) {
2733 struct inet6_ifaddr *ifp;
2734
2735 read_lock_bh(&idev->lock);
2736 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2737 spin_lock_bh(&ifp->lock);
2738 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2739 spin_unlock_bh(&ifp->lock);
2740 continue;
2741 }
2742 spin_unlock_bh(&ifp->lock);
2743 addrconf_dad_kick(ifp);
2744 }
2745 read_unlock_bh(&idev->lock);
2746}
2747
1da177e4
LT		 2748#ifdef CONFIG_PROC_FS
2749struct if6_iter_state {
3c40090a 2750 struct seq_net_private p;
1da177e4
LT		 2751 int bucket;
2752};
2753
2754static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2755{
2756 struct inet6_ifaddr *ifa = NULL;
2757 struct if6_iter_state *state = seq->private;
3c40090a 2758 struct net *net = state->p.net;
1da177e4
LT		 2759
2760 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2761 ifa = inet6_addr_lst[state->bucket];
3c40090a
DL		 2762
2763 while (ifa && ifa->idev->dev->nd_net != net)
2764 ifa = ifa->lst_next;
1da177e4
LT		 2765 if (ifa)
2766 break;
2767 }
2768 return ifa;
2769}
2770
2771static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2772{
2773 struct if6_iter_state *state = seq->private;
3c40090a 2774 struct net *net = state->p.net;
1da177e4
LT		 2775
2776 ifa = ifa->lst_next;
2777try_again:
3c40090a
DL		 2778 if (ifa) {
2779 if (ifa->idev->dev->nd_net != net) {
2780 ifa = ifa->lst_next;
2781 goto try_again;
2782 }
2783 }
2784
1da177e4
LT		 2785 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2786 ifa = inet6_addr_lst[state->bucket];
2787 goto try_again;
2788 }
3c40090a 2789
1da177e4
LT		 2790 return ifa;
2791}
2792
2793static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2794{
2795 struct inet6_ifaddr *ifa = if6_get_first(seq);
2796
2797 if (ifa)
2798 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2799 --pos;
2800 return pos ? NULL : ifa;
2801}
2802
2803static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2804 __acquires(addrconf_hash_lock)
1da177e4
LT		 2805{
2806 read_lock_bh(&addrconf_hash_lock);
2807 return if6_get_idx(seq, *pos);
2808}
2809
2810static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2811{
2812 struct inet6_ifaddr *ifa;
2813
2814 ifa = if6_get_next(seq, v);
2815 ++*pos;
2816 return ifa;
2817}
2818
2819static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2820 __releases(addrconf_hash_lock)
1da177e4
LT		 2821{
2822 read_unlock_bh(&addrconf_hash_lock);
2823}
2824
2825static int if6_seq_show(struct seq_file *seq, void *v)
2826{
2827 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2828 seq_printf(seq,
9343e79a 2829 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2830 NIP6(ifp->addr),
2831 ifp->idev->dev->ifindex,
2832 ifp->prefix_len,
2833 ifp->scope,
2834 ifp->flags,
2835 ifp->idev->dev->name);
2836 return 0;
2837}
2838
56b3d975 2839static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2840 .start = if6_seq_start,
2841 .next = if6_seq_next,
2842 .show = if6_seq_show,
2843 .stop = if6_seq_stop,
2844};
2845
2846static int if6_seq_open(struct inode *inode, struct file *file)
2847{
3c40090a
DL		 2848 return seq_open_net(inode, file, &if6_seq_ops,
2849 sizeof(struct if6_iter_state));
1da177e4
LT		 2850}
2851
9a32144e 2852static const struct file_operations if6_fops = {
1da177e4
LT		 2853 .owner = THIS_MODULE,
2854 .open = if6_seq_open,
2855 .read = seq_read,
2856 .llseek = seq_lseek,
3c40090a 2857 .release = seq_release_net,
1da177e4
LT		 2858};
2859
3c40090a 2860static int if6_proc_net_init(struct net *net)
1da177e4 2861{
3c40090a 2862 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2863 return -ENOMEM;
2864 return 0;
2865}
2866
3c40090a
DL		 2867static void if6_proc_net_exit(struct net *net)
2868{
2869 proc_net_remove(net, "if_inet6");
2870}
2871
2872static struct pernet_operations if6_proc_net_ops = {
2873 .init = if6_proc_net_init,
2874 .exit = if6_proc_net_exit,
2875};
2876
2877int __init if6_proc_init(void)
2878{
2879 return register_pernet_subsys(&if6_proc_net_ops);
2880}
2881
1da177e4
LT		 2882void if6_proc_exit(void)
2883{
3c40090a 2884 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2885}
2886#endif /* CONFIG_PROC_FS */
2887
59fbb3a6 2888#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2889/* Check if address is a home address configured on any interface. */
389f6612 2890int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2891{
2892 int ret = 0;
2893 struct inet6_ifaddr * ifp;
2894 u8 hash = ipv6_addr_hash(addr);
2895 read_lock_bh(&addrconf_hash_lock);
2896 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
389f6612
DL		 2897 if (ifp->idev->dev->nd_net != net)
2898 continue;
3b9f9a1c
NT		 2899 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2900 (ifp->flags & IFA_F_HOMEADDRESS)) {
2901 ret = 1;
2902 break;
2903 }
2904 }
2905 read_unlock_bh(&addrconf_hash_lock);
2906 return ret;
2907}
2908#endif
2909
1da177e4
LT		 2910/*
2911 * Periodic address status verification
2912 */
2913
2914static void addrconf_verify(unsigned long foo)
2915{
2916 struct inet6_ifaddr *ifp;
2917 unsigned long now, next;
2918 int i;
2919
2920 spin_lock_bh(&addrconf_verify_lock);
2921 now = jiffies;
2922 next = now + ADDR_CHECK_FREQUENCY;
2923
2924 del_timer(&addr_chk_timer);
2925
2926 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2927
2928restart:
5d5780df 2929 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2930 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2931 unsigned long age;
2932#ifdef CONFIG_IPV6_PRIVACY
2933 unsigned long regen_advance;
2934#endif
2935
2936 if (ifp->flags & IFA_F_PERMANENT)
2937 continue;
2938
2939 spin_lock(&ifp->lock);
2940 age = (now - ifp->tstamp) / HZ;
2941
2942#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2943 regen_advance = ifp->idev->cnf.regen_max_retry *
2944 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2945 ifp->idev->nd_parms->retrans_time / HZ;
2946#endif
2947
8f27ebb9
YH		 2948 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2949 age >= ifp->valid_lft) {
1da177e4
LT		 2950 spin_unlock(&ifp->lock);
2951 in6_ifa_hold(ifp);
5d5780df 2952 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2953 ipv6_del_addr(ifp);
2954 goto restart;
8f27ebb9
YH		 2955 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2956 spin_unlock(&ifp->lock);
2957 continue;
1da177e4
LT		 2958 } else if (age >= ifp->prefered_lft) {
2959 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2960 int deprecate = 0;
2961
2962 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2963 deprecate = 1;
2964 ifp->flags |= IFA_F_DEPRECATED;
2965 }
2966
2967 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2968 next = ifp->tstamp + ifp->valid_lft * HZ;
2969
2970 spin_unlock(&ifp->lock);
2971
2972 if (deprecate) {
2973 in6_ifa_hold(ifp);
5d5780df 2974 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2975
2976 ipv6_ifa_notify(0, ifp);
2977 in6_ifa_put(ifp);
2978 goto restart;
2979 }
2980#ifdef CONFIG_IPV6_PRIVACY
2981 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2982 !(ifp->flags&IFA_F_TENTATIVE)) {
2983 if (age >= ifp->prefered_lft - regen_advance) {
2984 struct inet6_ifaddr *ifpub = ifp->ifpub;
2985 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2986 next = ifp->tstamp + ifp->prefered_lft * HZ;
2987 if (!ifp->regen_count && ifpub) {
2988 ifp->regen_count++;
2989 in6_ifa_hold(ifp);
2990 in6_ifa_hold(ifpub);
2991 spin_unlock(&ifp->lock);
5d5780df 2992 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2993 spin_lock(&ifpub->lock);
2994 ifpub->regen_count = 0;
2995 spin_unlock(&ifpub->lock);
1da177e4
LT		 2996 ipv6_create_tempaddr(ifpub, ifp);
2997 in6_ifa_put(ifpub);
2998 in6_ifa_put(ifp);
2999 goto restart;
3000 }
3001 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3002 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3003 spin_unlock(&ifp->lock);
3004#endif
3005 } else {
3006 /* ifp->prefered_lft <= ifp->valid_lft */
3007 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3008 next = ifp->tstamp + ifp->prefered_lft * HZ;
3009 spin_unlock(&ifp->lock);
3010 }
3011 }
5d5780df 3012 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3013 }
3014
3015 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3016 add_timer(&addr_chk_timer);
3017 spin_unlock_bh(&addrconf_verify_lock);
3018}
3019
461d8837
TG		 3020static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3021{
3022 struct in6_addr *pfx = NULL;
3023
3024 if (addr)
3025 pfx = nla_data(addr);
3026
3027 if (local) {
3028 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3029 pfx = NULL;
3030 else
3031 pfx = nla_data(local);
3032 }
3033
3034 return pfx;
3035}
3036
ef7c79ed 3037static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3038 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3039 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3040 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3041};
3042
1da177e4
LT		 3043static int
3044inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3045{
b854272b 3046 struct net *net = skb->sk->sk_net;
b933f716
TG		 3047 struct ifaddrmsg *ifm;
3048 struct nlattr *tb[IFA_MAX+1];
1da177e4 3049 struct in6_addr *pfx;
b933f716 3050 int err;
1da177e4 3051
b933f716
TG		 3052 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3053 if (err < 0)
3054 return err;
3055
3056 ifm = nlmsg_data(nlh);
3057 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3058 if (pfx == NULL)
3059 return -EINVAL;
3060
af284937 3061 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3062}
3063
55ebaef1
NT		 3064static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3065 u32 prefered_lft, u32 valid_lft)
081bba5b 3066{
46d48046
YH		 3067 u32 flags = RTF_EXPIRES;
3068
081bba5b
NT		 3069 if (!valid_lft || (prefered_lft > valid_lft))
3070 return -EINVAL;
3071
46d48046 3072 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3073 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3074 flags = 0;
3075 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3076 valid_lft = 0x7FFFFFFF/HZ;
3077
3078 if (prefered_lft == 0)
55ebaef1 3079 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3080 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3081 (prefered_lft != INFINITY_LIFE_TIME))
3082 prefered_lft = 0x7FFFFFFF/HZ;
3083
3084 spin_lock_bh(&ifp->lock);
3b9f9a1c 3085 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3086 ifp->tstamp = jiffies;
3087 ifp->valid_lft = valid_lft;
3088 ifp->prefered_lft = prefered_lft;
3089
3090 spin_unlock_bh(&ifp->lock);
3091 if (!(ifp->flags&IFA_F_TENTATIVE))
3092 ipv6_ifa_notify(0, ifp);
081bba5b 3093
46d48046
YH		 3094 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3095 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3096 addrconf_verify(0);
3097
3098 return 0;
3099}
3100
1da177e4
LT		 3101static int
3102inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3103{
b854272b 3104 struct net *net = skb->sk->sk_net;
461d8837
TG		 3105 struct ifaddrmsg *ifm;
3106 struct nlattr *tb[IFA_MAX+1];
1da177e4 3107 struct in6_addr *pfx;
7198f8ce
TG		 3108 struct inet6_ifaddr *ifa;
3109 struct net_device *dev;
55ebaef1
NT		 3110 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3111 u8 ifa_flags;
461d8837 3112 int err;
1da177e4 3113
461d8837
TG		 3114 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3115 if (err < 0)
3116 return err;
3117
3118 ifm = nlmsg_data(nlh);
3119 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3120 if (pfx == NULL)
3121 return -EINVAL;
3122
461d8837 3123 if (tb[IFA_CACHEINFO]) {
0778769d 3124 struct ifa_cacheinfo *ci;
461d8837
TG		 3125
3126 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3127 valid_lft = ci->ifa_valid;
461d8837
TG		 3128 preferred_lft = ci->ifa_prefered;
3129 } else {
3130 preferred_lft = INFINITY_LIFE_TIME;
3131 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3132 }
3133
af284937 3134 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3135 if (dev == NULL)
3136 return -ENODEV;
3137
55ebaef1 3138 /* We ignore other flags so far. */
3b9f9a1c 3139 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3140
1cab3da6 3141 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3142 if (ifa == NULL) {
3143 /*
3144 * It would be best to check for !NLM_F_CREATE here but
3145 * userspace alreay relies on not having to provide this.
3146 */
af284937
DL		 3147 return inet6_addr_add(net, ifm->ifa_index, pfx,
3148 ifm->ifa_prefixlen, ifa_flags,
3149 preferred_lft, valid_lft);
081bba5b
NT		 3150 }
3151
7198f8ce
TG		 3152 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3153 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3154 err = -EEXIST;
3155 else
55ebaef1 3156 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3157
3158 in6_ifa_put(ifa);
3159
3160 return err;
1da177e4
LT		 3161}
3162
101bb229
TG		 3163static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3164 u8 scope, int ifindex)
3165{
3166 struct ifaddrmsg *ifm;
3167
3168 ifm = nlmsg_data(nlh);
3169 ifm->ifa_family = AF_INET6;
3170 ifm->ifa_prefixlen = prefixlen;
3171 ifm->ifa_flags = flags;
3172 ifm->ifa_scope = scope;
3173 ifm->ifa_index = ifindex;
3174}
3175
85486af0
TG		 3176static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3177 unsigned long tstamp, u32 preferred, u32 valid)
3178{
3179 struct ifa_cacheinfo ci;
3180
3181 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3182 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3183 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3184 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3185 ci.ifa_prefered = preferred;
3186 ci.ifa_valid = valid;
3187
3188 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3189}
3190
101bb229
TG		 3191static inline int rt_scope(int ifa_scope)
3192{
3193 if (ifa_scope & IFA_HOST)
3194 return RT_SCOPE_HOST;
3195 else if (ifa_scope & IFA_LINK)
3196 return RT_SCOPE_LINK;
3197 else if (ifa_scope & IFA_SITE)
3198 return RT_SCOPE_SITE;
3199 else
3200 return RT_SCOPE_UNIVERSE;
3201}
3202
0ab6803b
TG		 3203static inline int inet6_ifaddr_msgsize(void)
3204{
339bf98f
TG		 3205 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3206 + nla_total_size(16) /* IFA_ADDRESS */
3207 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3208}
c5396a31 3209
1da177e4 3210static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3211 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3212{
1da177e4 3213 struct nlmsghdr *nlh;
85486af0 3214 u32 preferred, valid;
1da177e4 3215
0ab6803b
TG		 3216 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3217 if (nlh == NULL)
26932566 3218 return -EMSGSIZE;
0ab6803b 3219
101bb229
TG		 3220 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3221 ifa->idev->dev->ifindex);
3222
1da177e4 3223 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3224 preferred = ifa->prefered_lft;
3225 valid = ifa->valid_lft;
3226 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3227 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3228 preferred -= tval;
3229 if (valid != INFINITY_LIFE_TIME)
3230 valid -= tval;
1da177e4
LT		 3231 }
3232 } else {
85486af0
TG		 3233 preferred = INFINITY_LIFE_TIME;
3234 valid = INFINITY_LIFE_TIME;
3235 }
3236
0ab6803b 3237 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3238 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3239 nlmsg_cancel(skb, nlh);
3240 return -EMSGSIZE;
3241 }
1da177e4 3242
0ab6803b 3243 return nlmsg_end(skb, nlh);
1da177e4
LT		 3244}
3245
3246static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3247 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3248{
1da177e4 3249 struct nlmsghdr *nlh;
101bb229
TG		 3250 u8 scope = RT_SCOPE_UNIVERSE;
3251 int ifindex = ifmca->idev->dev->ifindex;
3252
3253 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3254 scope = RT_SCOPE_SITE;
1da177e4 3255
0ab6803b
TG		 3256 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3257 if (nlh == NULL)
26932566 3258 return -EMSGSIZE;
85486af0 3259
0ab6803b
TG		 3260 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3261 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3262 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3263 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3264 nlmsg_cancel(skb, nlh);
3265 return -EMSGSIZE;
3266 }
85486af0 3267
0ab6803b 3268 return nlmsg_end(skb, nlh);
1da177e4
LT		 3269}
3270
3271static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3272 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3273{
1da177e4 3274 struct nlmsghdr *nlh;
101bb229
TG		 3275 u8 scope = RT_SCOPE_UNIVERSE;
3276 int ifindex = ifaca->aca_idev->dev->ifindex;
3277
3278 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3279 scope = RT_SCOPE_SITE;
1da177e4 3280
0ab6803b
TG		 3281 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3282 if (nlh == NULL)
26932566 3283 return -EMSGSIZE;
85486af0 3284
0ab6803b
TG		 3285 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3286 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3287 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3288 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3289 nlmsg_cancel(skb, nlh);
3290 return -EMSGSIZE;
3291 }
1da177e4 3292
0ab6803b 3293 return nlmsg_end(skb, nlh);
1da177e4
LT		 3294}
3295
3296enum addr_type_t
3297{
3298 UNICAST_ADDR,
3299 MULTICAST_ADDR,
3300 ANYCAST_ADDR,
3301};
3302
3303static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3304 enum addr_type_t type)
3305{
3306 int idx, ip_idx;
3307 int s_idx, s_ip_idx;
3308 int err = 1;
3309 struct net_device *dev;
3310 struct inet6_dev *idev = NULL;
3311 struct inet6_ifaddr *ifa;
3312 struct ifmcaddr6 *ifmca;
3313 struct ifacaddr6 *ifaca;
6fda7350 3314 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3315
3316 s_idx = cb->args[0];
3317 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3318
7562f876 3319 idx = 0;
6fda7350 3320 for_each_netdev(net, dev) {
1da177e4 3321 if (idx < s_idx)
7562f876 3322 goto cont;
1da177e4
LT		 3323 if (idx > s_idx)
3324 s_ip_idx = 0;
3325 ip_idx = 0;
3326 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3327 goto cont;
1da177e4
LT		 3328 read_lock_bh(&idev->lock);
3329 switch (type) {
3330 case UNICAST_ADDR:
ae9cda5d 3331 /* unicast address incl. temp addr */
1da177e4
LT		 3332 for (ifa = idev->addr_list; ifa;
3333 ifa = ifa->if_next, ip_idx++) {
3334 if (ip_idx < s_ip_idx)
3335 continue;
5d5619b4
YH		 3336 err = inet6_fill_ifaddr(skb, ifa,
3337 NETLINK_CB(cb->skb).pid,
3338 cb->nlh->nlmsg_seq,
3339 RTM_NEWADDR,
3340 NLM_F_MULTI);
1da177e4 3341 }
1da177e4
LT		 3342 break;
3343 case MULTICAST_ADDR:
3344 /* multicast address */
1ab1457c 3345 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3346 ifmca = ifmca->next, ip_idx++) {
3347 if (ip_idx < s_ip_idx)
3348 continue;
5d5619b4
YH		 3349 err = inet6_fill_ifmcaddr(skb, ifmca,
3350 NETLINK_CB(cb->skb).pid,
3351 cb->nlh->nlmsg_seq,
3352 RTM_GETMULTICAST,
3353 NLM_F_MULTI);
1da177e4
LT		 3354 }
3355 break;
3356 case ANYCAST_ADDR:
3357 /* anycast address */
3358 for (ifaca = idev->ac_list; ifaca;
3359 ifaca = ifaca->aca_next, ip_idx++) {
3360 if (ip_idx < s_ip_idx)
3361 continue;
5d5619b4
YH		 3362 err = inet6_fill_ifacaddr(skb, ifaca,
3363 NETLINK_CB(cb->skb).pid,
3364 cb->nlh->nlmsg_seq,
3365 RTM_GETANYCAST,
3366 NLM_F_MULTI);
1da177e4
LT		 3367 }
3368 break;
3369 default:
3370 break;
3371 }
3372 read_unlock_bh(&idev->lock);
3373 in6_dev_put(idev);
5d5619b4
YH		 3374
3375 if (err <= 0)
3376 break;
7562f876
PE		 3377cont:
3378 idx++;
1da177e4 3379 }
1da177e4
LT		 3380 cb->args[0] = idx;
3381 cb->args[1] = ip_idx;
3382 return skb->len;
3383}
3384
3385static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3386{
3387 enum addr_type_t type = UNICAST_ADDR;
b854272b 3388
1da177e4
LT		 3389 return inet6_dump_addr(skb, cb, type);
3390}
3391
3392static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3393{
3394 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3395
1da177e4
LT		 3396 return inet6_dump_addr(skb, cb, type);
3397}
3398
3399
3400static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3401{
3402 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3403
1da177e4
LT		 3404 return inet6_dump_addr(skb, cb, type);
3405}
3406
1b29fc2c
TG		 3407static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3408 void *arg)
6c223828 3409{
b854272b 3410 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3411 struct ifaddrmsg *ifm;
3412 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3413 struct in6_addr *addr = NULL;
3414 struct net_device *dev = NULL;
3415 struct inet6_ifaddr *ifa;
3416 struct sk_buff *skb;
6c223828
NT		 3417 int err;
3418
1b29fc2c
TG		 3419 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3420 if (err < 0)
3421 goto errout;
3422
3423 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3424 if (addr == NULL) {
3425 err = -EINVAL;
3426 goto errout;
6c223828 3427 }
6c223828 3428
1b29fc2c 3429 ifm = nlmsg_data(nlh);
6c223828 3430 if (ifm->ifa_index)
6fda7350 3431 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3432
1cab3da6 3433 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3434 err = -EADDRNOTAVAIL;
3435 goto errout;
3436 }
6c223828 3437
0ab6803b 3438 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3439 err = -ENOBUFS;
1b29fc2c 3440 goto errout_ifa;
6c223828
NT		 3441 }
3442
6c223828
NT		 3443 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3444 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3445 if (err < 0) {
3446 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3447 WARN_ON(err == -EMSGSIZE);
3448 kfree_skb(skb);
3449 goto errout_ifa;
3450 }
6fda7350 3451 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3452errout_ifa:
6c223828 3453 in6_ifa_put(ifa);
1b29fc2c 3454errout:
6c223828 3455 return err;
6c223828
NT		 3456}
3457
1da177e4
LT		 3458static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3459{
3460 struct sk_buff *skb;
6fda7350 3461 struct net *net = ifa->idev->dev->nd_net;
5d620266 3462 int err = -ENOBUFS;
1da177e4 3463
0ab6803b 3464 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3465 if (skb == NULL)
3466 goto errout;
3467
3468 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3469 if (err < 0) {
3470 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3471 WARN_ON(err == -EMSGSIZE);
3472 kfree_skb(skb);
3473 goto errout;
3474 }
6fda7350 3475 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3476errout:
3477 if (err < 0)
6fda7350 3478 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3479}
3480
b6f99a21 3481static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3482 __s32 *array, int bytes)
3483{
04561c1f
TG		 3484 BUG_ON(bytes < (DEVCONF_MAX * 4));
3485
1da177e4
LT		 3486 memset(array, 0, bytes);
3487 array[DEVCONF_FORWARDING] = cnf->forwarding;
3488 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3489 array[DEVCONF_MTU6] = cnf->mtu6;
3490 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3491 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3492 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3493 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3494 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3495 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3496 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3497 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3498#ifdef CONFIG_IPV6_PRIVACY
3499 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3500 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3501 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3502 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3503 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3504#endif
3505 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3506 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3507 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3508#ifdef CONFIG_IPV6_ROUTER_PREF
3509 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3510 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3511#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3512 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3513#endif
930d6ff2 3514#endif
fbea49e1 3515 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3516 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3517#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3518 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3519#endif
1da177e4
LT		 3520}
3521
339bf98f
TG		 3522static inline size_t inet6_if_nlmsg_size(void)
3523{
3524 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3525 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3526 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3527 + nla_total_size(4) /* IFLA_MTU */
3528 + nla_total_size(4) /* IFLA_LINK */
3529 + nla_total_size( /* IFLA_PROTINFO */
3530 nla_total_size(4) /* IFLA_INET6_FLAGS */
3531 + nla_total_size(sizeof(struct ifla_cacheinfo))
3532 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3533 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3534 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3535 );
3536}
c5396a31 3537
7f7d9a6b
HX		 3538static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3539 int bytes)
3540{
3541 int i;
3542 int pad = bytes - sizeof(u64) * items;
3543 BUG_ON(pad < 0);
3544
3545 /* Use put_unaligned() because stats may not be aligned for u64. */
3546 put_unaligned(items, &stats[0]);
3547 for (i = 1; i < items; i++)
3548 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3549
3550 memset(&stats[items], 0, pad);
3551}
3552
3553static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3554 int bytes)
3555{
3556 switch(attrtype) {
3557 case IFLA_INET6_STATS:
3558 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3559 break;
3560 case IFLA_INET6_ICMP6STATS:
3561 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3562 break;
3563 }
3564}
3565
1ab1457c 3566static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3567 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3568{
04561c1f 3569 struct net_device *dev = idev->dev;
bf99f1bd 3570 struct nlattr *nla;
04561c1f
TG		 3571 struct ifinfomsg *hdr;
3572 struct nlmsghdr *nlh;
3573 void *protoinfo;
3574 struct ifla_cacheinfo ci;
3575
3576 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3577 if (nlh == NULL)
26932566 3578 return -EMSGSIZE;
04561c1f
TG		 3579
3580 hdr = nlmsg_data(nlh);
3581 hdr->ifi_family = AF_INET6;
3582 hdr->__ifi_pad = 0;
3583 hdr->ifi_type = dev->type;
3584 hdr->ifi_index = dev->ifindex;
3585 hdr->ifi_flags = dev_get_flags(dev);
3586 hdr->ifi_change = 0;
3587
3588 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3589
3590 if (dev->addr_len)
04561c1f 3591 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3592
04561c1f 3593 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3594 if (dev->ifindex != dev->iflink)
04561c1f 3595 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3596
04561c1f
TG		 3597 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3598 if (protoinfo == NULL)
3599 goto nla_put_failure;
1da177e4 3600
04561c1f 3601 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3602
1da177e4
LT		 3603 ci.max_reasm_len = IPV6_MAXPLEN;
3604 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3605 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3606 ci.reachable_time = idev->nd_parms->reachable_time;
3607 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3608 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3609
bf99f1bd
YH		 3610 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3611 if (nla == NULL)
04561c1f 3612 goto nla_put_failure;
bf99f1bd 3613 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3614
bf99f1bd
YH		 3615 /* XXX - MC not implemented */
3616
3617 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3618 if (nla == NULL)
3619 goto nla_put_failure;
3620 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3621
3622 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3623 if (nla == NULL)
3624 goto nla_put_failure;
3625 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3626
04561c1f
TG		 3627 nla_nest_end(skb, protoinfo);
3628 return nlmsg_end(skb, nlh);
1da177e4 3629
04561c1f 3630nla_put_failure:
26932566
PM		 3631 nlmsg_cancel(skb, nlh);
3632 return -EMSGSIZE;
1da177e4
LT		 3633}
3634
3635static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3636{
b854272b 3637 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3638 int idx, err;
3639 int s_idx = cb->args[0];
3640 struct net_device *dev;
3641 struct inet6_dev *idev;
3642
3643 read_lock(&dev_base_lock);
7562f876 3644 idx = 0;
6fda7350 3645 for_each_netdev(net, dev) {
1da177e4 3646 if (idx < s_idx)
7562f876 3647 goto cont;
1da177e4 3648 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3649 goto cont;
1ab1457c 3650 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3651 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3652 in6_dev_put(idev);
3653 if (err <= 0)
3654 break;
7562f876
PE		 3655cont:
3656 idx++;
1da177e4
LT		 3657 }
3658 read_unlock(&dev_base_lock);
3659 cb->args[0] = idx;
3660
3661 return skb->len;
3662}
3663
3664void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3665{
3666 struct sk_buff *skb;
6fda7350 3667 struct net *net = idev->dev->nd_net;
8d7a76c9 3668 int err = -ENOBUFS;
1ab1457c 3669
339bf98f 3670 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3671 if (skb == NULL)
3672 goto errout;
3673
3674 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3675 if (err < 0) {
3676 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3677 WARN_ON(err == -EMSGSIZE);
3678 kfree_skb(skb);
3679 goto errout;
3680 }
6fda7350 3681 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3682errout:
3683 if (err < 0)
6fda7350 3684 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3685}
3686
339bf98f
TG		 3687static inline size_t inet6_prefix_nlmsg_size(void)
3688{
3689 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3690 + nla_total_size(sizeof(struct in6_addr))
3691 + nla_total_size(sizeof(struct prefix_cacheinfo));
3692}
c5396a31 3693
1da177e4 3694static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3695 struct prefix_info *pinfo, u32 pid, u32 seq,
3696 int event, unsigned int flags)
1da177e4 3697{
6051e2f4
TG		 3698 struct prefixmsg *pmsg;
3699 struct nlmsghdr *nlh;
1da177e4
LT		 3700 struct prefix_cacheinfo ci;
3701
6051e2f4
TG		 3702 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3703 if (nlh == NULL)
26932566 3704 return -EMSGSIZE;
6051e2f4
TG		 3705
3706 pmsg = nlmsg_data(nlh);
1da177e4 3707 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3708 pmsg->prefix_pad1 = 0;
3709 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3710 pmsg->prefix_ifindex = idev->dev->ifindex;
3711 pmsg->prefix_len = pinfo->prefix_len;
3712 pmsg->prefix_type = pinfo->type;
8a47077a 3713 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3714 pmsg->prefix_flags = 0;
3715 if (pinfo->onlink)
3716 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3717 if (pinfo->autoconf)
3718 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3719
6051e2f4 3720 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3721
3722 ci.preferred_time = ntohl(pinfo->prefered);
3723 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3724 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3725
6051e2f4 3726 return nlmsg_end(skb, nlh);
1da177e4 3727
6051e2f4 3728nla_put_failure:
26932566
PM		 3729 nlmsg_cancel(skb, nlh);
3730 return -EMSGSIZE;
1da177e4
LT		 3731}
3732
1ab1457c 3733static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3734 struct prefix_info *pinfo)
3735{
3736 struct sk_buff *skb;
6fda7350 3737 struct net *net = idev->dev->nd_net;
8c384bfa 3738 int err = -ENOBUFS;
1da177e4 3739
339bf98f 3740 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3741 if (skb == NULL)
3742 goto errout;
3743
3744 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3745 if (err < 0) {
3746 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3747 WARN_ON(err == -EMSGSIZE);
3748 kfree_skb(skb);
3749 goto errout;
3750 }
6fda7350 3751 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3752errout:
3753 if (err < 0)
6fda7350 3754 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3755}
3756
1da177e4
LT		 3757static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3758{
3759 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3760
3761 switch (event) {
3762 case RTM_NEWADDR:
95c385b4
NH		 3763 /*
3764 * If the address was optimistic
3765 * we inserted the route at the start of
3766 * our DAD process, so we don't need
3767 * to do it again
3768 */
3769 if (!(ifp->rt->rt6i_node))
3770 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3771 if (ifp->idev->cnf.forwarding)
3772 addrconf_join_anycast(ifp);
3773 break;
3774 case RTM_DELADDR:
3775 if (ifp->idev->cnf.forwarding)
3776 addrconf_leave_anycast(ifp);
3777 addrconf_leave_solict(ifp->idev, &ifp->addr);
3778 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3779 if (ip6_del_rt(ifp->rt))
1da177e4 3780 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3781 break;
3782 }
3783}
3784
3785static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3786{
8814c4b5 3787 rcu_read_lock_bh();
1da177e4
LT		 3788 if (likely(ifp->idev->dead == 0))
3789 __ipv6_ifa_notify(event, ifp);
8814c4b5 3790 rcu_read_unlock_bh();
1da177e4
LT		 3791}
3792
3793#ifdef CONFIG_SYSCTL
3794
3795static
3796int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3797 void __user *buffer, size_t *lenp, loff_t *ppos)
3798{
3799 int *valp = ctl->data;
3800 int val = *valp;
3801 int ret;
3802
3803 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3804
c8fecf22
PE		 3805 if (write)
3806 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3807 return ret;
1da177e4
LT		 3808}
3809
1ab1457c 3810static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3811 int __user *name, int nlen,
3812 void __user *oldval,
3813 size_t __user *oldlenp,
1f29bcd7 3814 void __user *newval, size_t newlen)
1da177e4
LT		 3815{
3816 int *valp = table->data;
c8fecf22 3817 int val = *valp;
1da177e4
LT		 3818 int new;
3819
3820 if (!newval || !newlen)
3821 return 0;
3822 if (newlen != sizeof(int))
3823 return -EINVAL;
3824 if (get_user(new, (int __user *)newval))
3825 return -EFAULT;
3826 if (new == *valp)
3827 return 0;
3828 if (oldval && oldlenp) {
3829 size_t len;
3830 if (get_user(len, oldlenp))
3831 return -EFAULT;
3832 if (len) {
3833 if (len > table->maxlen)
3834 len = table->maxlen;
3835 if (copy_to_user(oldval, valp, len))
3836 return -EFAULT;
3837 if (put_user(len, oldlenp))
3838 return -EFAULT;
3839 }
3840 }
3841
c8fecf22
PE		 3842 *valp = new;
3843 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3844 return 1;
3845}
3846
3847static struct addrconf_sysctl_table
3848{
3849 struct ctl_table_header *sysctl_header;
3850 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3851 char *dev_name;
ab32ea5d 3852} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3853 .sysctl_header = NULL,
3854 .addrconf_vars = {
1ab1457c 3855 {
1da177e4
LT		 3856 .ctl_name = NET_IPV6_FORWARDING,
3857 .procname = "forwarding",
1ab1457c 3858 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3859 .maxlen = sizeof(int),
3860 .mode = 0644,
1ab1457c 3861 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3862 .strategy = &addrconf_sysctl_forward_strategy,
3863 },
3864 {
3865 .ctl_name = NET_IPV6_HOP_LIMIT,
3866 .procname = "hop_limit",
1ab1457c 3867 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3868 .maxlen = sizeof(int),
3869 .mode = 0644,
3870 .proc_handler = proc_dointvec,
3871 },
3872 {
3873 .ctl_name = NET_IPV6_MTU,
3874 .procname = "mtu",
3875 .data = &ipv6_devconf.mtu6,
1ab1457c 3876 .maxlen = sizeof(int),
1da177e4 3877 .mode = 0644,
1ab1457c 3878 .proc_handler = &proc_dointvec,
1da177e4
LT		 3879 },
3880 {
3881 .ctl_name = NET_IPV6_ACCEPT_RA,
3882 .procname = "accept_ra",
1ab1457c 3883 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3884 .maxlen = sizeof(int),
3885 .mode = 0644,
1ab1457c 3886 .proc_handler = &proc_dointvec,
1da177e4
LT		 3887 },
3888 {
3889 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3890 .procname = "accept_redirects",
1ab1457c 3891 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3892 .maxlen = sizeof(int),
3893 .mode = 0644,
1ab1457c 3894 .proc_handler = &proc_dointvec,
1da177e4
LT		 3895 },
3896 {
3897 .ctl_name = NET_IPV6_AUTOCONF,
3898 .procname = "autoconf",
1ab1457c 3899 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3900 .maxlen = sizeof(int),
3901 .mode = 0644,
1ab1457c 3902 .proc_handler = &proc_dointvec,
1da177e4
LT		 3903 },
3904 {
3905 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3906 .procname = "dad_transmits",
1ab1457c 3907 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3908 .maxlen = sizeof(int),
3909 .mode = 0644,
1ab1457c 3910 .proc_handler = &proc_dointvec,
1da177e4
LT		 3911 },
3912 {
3913 .ctl_name = NET_IPV6_RTR_SOLICITS,
3914 .procname = "router_solicitations",
1ab1457c 3915 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3916 .maxlen = sizeof(int),
3917 .mode = 0644,
1ab1457c 3918 .proc_handler = &proc_dointvec,
1da177e4
LT		 3919 },
3920 {
3921 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3922 .procname = "router_solicitation_interval",
1ab1457c 3923 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3924 .maxlen = sizeof(int),
3925 .mode = 0644,
1ab1457c 3926 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3927 .strategy = &sysctl_jiffies,
3928 },
3929 {
3930 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3931 .procname = "router_solicitation_delay",
1ab1457c 3932 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3933 .maxlen = sizeof(int),
3934 .mode = 0644,
1ab1457c 3935 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3936 .strategy = &sysctl_jiffies,
3937 },
3938 {
3939 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3940 .procname = "force_mld_version",
1ab1457c 3941 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3942 .maxlen = sizeof(int),
3943 .mode = 0644,
1ab1457c 3944 .proc_handler = &proc_dointvec,
1da177e4
LT		 3945 },
3946#ifdef CONFIG_IPV6_PRIVACY
3947 {
3948 .ctl_name = NET_IPV6_USE_TEMPADDR,
3949 .procname = "use_tempaddr",
1ab1457c 3950 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3951 .maxlen = sizeof(int),
3952 .mode = 0644,
1ab1457c 3953 .proc_handler = &proc_dointvec,
1da177e4
LT		 3954 },
3955 {
3956 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3957 .procname = "temp_valid_lft",
1ab1457c 3958 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3959 .maxlen = sizeof(int),
3960 .mode = 0644,
1ab1457c 3961 .proc_handler = &proc_dointvec,
1da177e4
LT		 3962 },
3963 {
3964 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3965 .procname = "temp_prefered_lft",
1ab1457c 3966 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3967 .maxlen = sizeof(int),
3968 .mode = 0644,
1ab1457c 3969 .proc_handler = &proc_dointvec,
1da177e4
LT		 3970 },
3971 {
3972 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3973 .procname = "regen_max_retry",
1ab1457c 3974 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3975 .maxlen = sizeof(int),
3976 .mode = 0644,
1ab1457c 3977 .proc_handler = &proc_dointvec,
1da177e4
LT		 3978 },
3979 {
3980 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3981 .procname = "max_desync_factor",
1ab1457c 3982 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3983 .maxlen = sizeof(int),
3984 .mode = 0644,
1ab1457c 3985 .proc_handler = &proc_dointvec,
1da177e4
LT		 3986 },
3987#endif
3988 {
3989 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3990 .procname = "max_addresses",
3991 .data = &ipv6_devconf.max_addresses,
3992 .maxlen = sizeof(int),
3993 .mode = 0644,
3994 .proc_handler = &proc_dointvec,
3995 },
65f5c7c1
YH		 3996 {
3997 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3998 .procname = "accept_ra_defrtr",
1ab1457c 3999 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4000 .maxlen = sizeof(int),
4001 .mode = 0644,
1ab1457c 4002 .proc_handler = &proc_dointvec,
65f5c7c1 4003 },
c4fd30eb
YH		 4004 {
4005 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4006 .procname = "accept_ra_pinfo",
1ab1457c 4007 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4008 .maxlen = sizeof(int),
4009 .mode = 0644,
1ab1457c 4010 .proc_handler = &proc_dointvec,
c4fd30eb 4011 },
930d6ff2
YH		 4012#ifdef CONFIG_IPV6_ROUTER_PREF
4013 {
4014 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4015 .procname = "accept_ra_rtr_pref",
4016 .data = &ipv6_devconf.accept_ra_rtr_pref,
4017 .maxlen = sizeof(int),
4018 .mode = 0644,
4019 .proc_handler = &proc_dointvec,
4020 },
52e16356
YH		 4021 {
4022 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4023 .procname = "router_probe_interval",
4024 .data = &ipv6_devconf.rtr_probe_interval,
4025 .maxlen = sizeof(int),
4026 .mode = 0644,
4027 .proc_handler = &proc_dointvec_jiffies,
4028 .strategy = &sysctl_jiffies,
4029 },
fa03ef38 4030#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4031 {
4032 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4033 .procname = "accept_ra_rt_info_max_plen",
4034 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4035 .maxlen = sizeof(int),
4036 .mode = 0644,
4037 .proc_handler = &proc_dointvec,
4038 },
4039#endif
930d6ff2 4040#endif
fbea49e1
YH		 4041 {
4042 .ctl_name = NET_IPV6_PROXY_NDP,
4043 .procname = "proxy_ndp",
4044 .data = &ipv6_devconf.proxy_ndp,
4045 .maxlen = sizeof(int),
4046 .mode = 0644,
4047 .proc_handler = &proc_dointvec,
4048 },
0bcbc926
YH		 4049 {
4050 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4051 .procname = "accept_source_route",
4052 .data = &ipv6_devconf.accept_source_route,
4053 .maxlen = sizeof(int),
4054 .mode = 0644,
4055 .proc_handler = &proc_dointvec,
4056 },
95c385b4
NH		 4057#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4058 {
4059 .ctl_name = CTL_UNNUMBERED,
4060 .procname = "optimistic_dad",
4061 .data = &ipv6_devconf.optimistic_dad,
4062 .maxlen = sizeof(int),
4063 .mode = 0644,
4064 .proc_handler = &proc_dointvec,
4065
4066 },
4067#endif
1da177e4
LT		 4068 {
4069 .ctl_name = 0, /* sentinel */
4070 }
4071 },
1da177e4
LT		 4072};
4073
bff16c2f
PE		 4074static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4075 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4076{
4077 int i;
1da177e4 4078 struct addrconf_sysctl_table *t;
1da177e4 4079
1dab6222
PE		 4080#define ADDRCONF_CTL_PATH_DEV 3
4081
4082 struct ctl_path addrconf_ctl_path[] = {
4083 { .procname = "net", .ctl_name = CTL_NET, },
4084 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4085 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4086 { /* to be set */ },
4087 { },
4088 };
4089
4090
af879cc7 4091 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4092 if (t == NULL)
f68635e6
PE		 4093 goto out;
4094
1da177e4
LT		 4095 for (i=0; t->addrconf_vars[i].data; i++) {
4096 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4097 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4098 t->addrconf_vars[i].extra2 = net;
1da177e4 4099 }
1da177e4 4100
1ab1457c
YH		 4101 /*
4102 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4103 * by sysctl and we wouldn't want anyone to change it under our feet
4104 * (see SIOCSIFNAME).
1ab1457c 4105 */
1dab6222
PE		 4106 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4107 if (!t->dev_name)
f68635e6 4108 goto free;
1da177e4 4109
1dab6222
PE		 4110 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4111 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4112
bff16c2f 4113 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4114 t->addrconf_vars);
1da177e4
LT		 4115 if (t->sysctl_header == NULL)
4116 goto free_procname;
f68635e6
PE		 4117
4118 p->sysctl = t;
95897312 4119 return 0;
1da177e4 4120
f68635e6 4121free_procname:
1dab6222 4122 kfree(t->dev_name);
f68635e6 4123free:
1da177e4 4124 kfree(t);
f68635e6 4125out:
95897312 4126 return -ENOBUFS;
1da177e4
LT		 4127}
4128
408c4768
PE		 4129static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4130{
4131 struct addrconf_sysctl_table *t;
4132
4133 if (p->sysctl == NULL)
4134 return;
4135
4136 t = p->sysctl;
4137 p->sysctl = NULL;
4138 unregister_sysctl_table(t->sysctl_header);
4139 kfree(t->dev_name);
4140 kfree(t);
4141}
4142
f52295a9
PE		 4143static void addrconf_sysctl_register(struct inet6_dev *idev)
4144{
408c4768
PE		 4145 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4146 NET_IPV6_NEIGH, "ipv6",
4147 &ndisc_ifinfo_sysctl_change,
4148 NULL);
bff16c2f
PE		 4149 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4150 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4151}
4152
408c4768 4153static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4154{
408c4768
PE		 4155 __addrconf_sysctl_unregister(&idev->cnf);
4156 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4157}
4158
4159
4160#endif
4161
e0da5a48
PE		 4162static int addrconf_init_net(struct net *net)
4163{
4164 int err;
4165 struct ipv6_devconf *all, *dflt;
4166
4167 err = -ENOMEM;
4168 all = &ipv6_devconf;
4169 dflt = &ipv6_devconf_dflt;
4170
4171 if (net != &init_net) {
4172 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4173 if (all == NULL)
4174 goto err_alloc_all;
4175
4176 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4177 if (dflt == NULL)
4178 goto err_alloc_dflt;
4179 }
4180
4181 net->ipv6.devconf_all = all;
4182 net->ipv6.devconf_dflt = dflt;
4183
4184#ifdef CONFIG_SYSCTL
4185 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4186 NULL, all);
4187 if (err < 0)
4188 goto err_reg_all;
4189
4190 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4191 NULL, dflt);
4192 if (err < 0)
4193 goto err_reg_dflt;
4194#endif
4195 return 0;
4196
4197#ifdef CONFIG_SYSCTL
4198err_reg_dflt:
4199 __addrconf_sysctl_unregister(all);
4200err_reg_all:
4201 kfree(dflt);
4202#endif
4203err_alloc_dflt:
4204 kfree(all);
4205err_alloc_all:
4206 return err;
4207}
4208
4209static void addrconf_exit_net(struct net *net)
4210{
4211#ifdef CONFIG_SYSCTL
4212 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4213 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4214#endif
4215 if (net != &init_net) {
4216 kfree(net->ipv6.devconf_dflt);
4217 kfree(net->ipv6.devconf_all);
4218 }
4219}
4220
4221static struct pernet_operations addrconf_ops = {
4222 .init = addrconf_init_net,
4223 .exit = addrconf_exit_net,
4224};
4225
1da177e4
LT		 4226/*
4227 * Device notifier
4228 */
4229
4230int register_inet6addr_notifier(struct notifier_block *nb)
4231{
1ab1457c 4232 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4233}
4234
7159039a
YH		 4235EXPORT_SYMBOL(register_inet6addr_notifier);
4236
1da177e4
LT		 4237int unregister_inet6addr_notifier(struct notifier_block *nb)
4238{
1ab1457c 4239 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4240}
4241
7159039a
YH		 4242EXPORT_SYMBOL(unregister_inet6addr_notifier);
4243
af284937
DL		 4244
4245static int addrconf_net_init(struct net *net)
4246{
4247 return 0;
4248}
4249
4250static void addrconf_net_exit(struct net *net)
4251{
6fda7350
BT		 4252 struct net_device *dev;
4253
6fda7350
BT		 4254 rtnl_lock();
4255 /* clean dev list */
4256 for_each_netdev(net, dev) {
4257 if (__in6_dev_get(dev) == NULL)
4258 continue;
4259 addrconf_ifdown(dev, 1);
4260 }
4261 addrconf_ifdown(net->loopback_dev, 2);
4262 rtnl_unlock();
af284937
DL		 4263}
4264
4265static struct pernet_operations addrconf_net_ops = {
4266 .init = addrconf_net_init,
4267 .exit = addrconf_net_exit,
4268};
4269
1da177e4
LT		 4270/*
4271 * Init / cleanup code
4272 */
4273
4274int __init addrconf_init(void)
4275{
2a8cc6c8
YH		 4276 int err;
4277
4278 if ((err = ipv6_addr_label_init()) < 0) {
4279 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4280 err);
4281 return err;
4282 }
1da177e4 4283
e0da5a48
PE		 4284 register_pernet_subsys(&addrconf_ops);
4285
1da177e4
LT		 4286 /* The addrconf netdev notifier requires that loopback_dev
4287 * has it's ipv6 private information allocated and setup
4288 * before it can bring up and give link-local addresses
4289 * to other devices which are up.
4290 *
4291 * Unfortunately, loopback_dev is not necessarily the first
4292 * entry in the global dev_base list of net devices. In fact,
4293 * it is likely to be the very last entry on that list.
4294 * So this causes the notifier registry below to try and
4295 * give link-local addresses to all devices besides loopback_dev
4296 * first, then loopback_dev, which cases all the non-loopback_dev
4297 * devices to fail to get a link-local address.
4298 *
4299 * So, as a temporary fix, allocate the ipv6 structure for
4300 * loopback_dev first by hand.
4301 * Longer term, all of the dependencies ipv6 has upon the loopback
4302 * device and it being up should be removed.
4303 */
4304 rtnl_lock();
2774c7ab 4305 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4306 err = -ENOMEM;
4307 rtnl_unlock();
4308 if (err)
e0da5a48 4309 goto errlo;
1da177e4 4310
af284937
DL		 4311 err = register_pernet_device(&addrconf_net_ops);
4312 if (err)
4313 return err;
4314
1da177e4
LT		 4315 register_netdevice_notifier(&ipv6_dev_notf);
4316
1da177e4 4317 addrconf_verify(0);
c127ea2c
TG		 4318
4319 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4320 if (err < 0)
4321 goto errout;
4322
4323 /* Only the first call to __rtnl_register can fail */
4324 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4325 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4326 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4327 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4328 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4329
2a8cc6c8
YH		 4330 ipv6_addr_label_rtnl_register();
4331
1da177e4 4332 return 0;
c127ea2c
TG		 4333errout:
4334 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4335errlo:
4336 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4337
4338 return err;
1da177e4
LT		 4339}
4340
09f7709f 4341void addrconf_cleanup(void)
1da177e4 4342{
1ab1457c 4343 struct inet6_ifaddr *ifa;
1da177e4
LT		 4344 int i;
4345
4346 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4347 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4348
e0da5a48 4349 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4350
4351 rtnl_lock();
4352
1da177e4
LT		 4353 /*
4354 * Check hash table.
4355 */
1da177e4
LT		 4356 write_lock_bh(&addrconf_hash_lock);
4357 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4358 for (ifa=inet6_addr_lst[i]; ifa; ) {
4359 struct inet6_ifaddr *bifa;
4360
4361 bifa = ifa;
4362 ifa = ifa->lst_next;
4363 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4364 /* Do not free it; something is wrong.
4365 Now we can investigate it with debugger.
4366 */
4367 }
4368 }
4369 write_unlock_bh(&addrconf_hash_lock);
4370
4371 del_timer(&addr_chk_timer);
1da177e4 4372 rtnl_unlock();
af284937
DL		 4373
4374 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4375}
Clone of davem's net-next-2.6 tree