projects / deliverable / linux.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[IPV6]: Unify ip6_onlink() and ipip6_onlink().
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
ab32ea5d 157struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 188};
189
ab32ea5d 190static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201#ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207#endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 209 .accept_ra_defrtr = 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216#endif
930d6ff2 217#endif
fbea49e1 218 .proxy_ndp = 0,
0bcbc926 219 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 220};
221
222/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 223const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
1da177e4
LT		 232static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233{
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236}
237
238enum addrconf_timer_t
239{
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243};
244
245static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248{
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263}
264
7f7d9a6b
HX		 265static int snmp6_alloc_dev(struct inet6_dev *idev)
266{
7f7d9a6b 267 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 268 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 271 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 272 goto err_icmp;
14878f75 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 274 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 275 goto err_icmpmsg;
7f7d9a6b
HX		 276
277 return 0;
278
14878f75
DS		 279err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 281err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283err_ip:
aaf70ec7 284 return -ENOMEM;
7f7d9a6b
HX		 285}
286
16910b98 287static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 288{
14878f75 289 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 292}
293
1da177e4
LT		 294/* Nobody refers to this device, we may destroy it. */
295
8814c4b5
YH		 296static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297{
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300}
301
1da177e4
LT		 302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
8814c4b5 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 317}
318
7159039a
YH		 319EXPORT_SYMBOL(in6_dev_finish_destroy);
320
1da177e4
LT		 321static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322{
323 struct inet6_dev *ndev;
d88ae4cc 324 struct in6_addr maddr;
1da177e4
LT		 325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
1ab1457c 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 332
1ab1457c
YH		 333 if (ndev == NULL)
334 return NULL;
322f74a4
IO		 335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
c346dca1 338 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
1da177e4 348
322f74a4
IO		 349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 352 __func__, dev->name));
322f74a4
IO		 353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
1da177e4 358
322f74a4
IO		 359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 362 __func__, dev->name));
322f74a4
IO		 363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
1da177e4
LT		 373
374#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 378#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380#endif
381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
322f74a4
IO		 393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
1da177e4
LT		 397#endif
398
f24e3d65 399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 400 ndev->if_flags |= IF_READY;
401
322f74a4
IO		 402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
f52295a9 404 addrconf_sysctl_register(ndev);
30c4cf57
DS		 405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
1da177e4
LT		 412 return ndev;
413}
414
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 */
c346dca1 564 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
322f74a4 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
1da177e4
LT		 584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
57f5f544
KF		 594 ifa->rt = rt;
595
95c385b4
NH		 596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
1da177e4
LT		 606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
e55ffac6 621 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 622
623#ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629#endif
630
1da177e4
LT		 631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633out2:
8814c4b5 634 rcu_read_unlock_bh();
1da177e4 635
fd92833a 636 if (likely(err == 0))
e041c683 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647}
648
649/* This function wants to get referenced ifp and releases it before return */
650
651static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652{
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676#ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692#endif
693
1d142804 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
1d142804 702 continue;
1da177e4
LT		 703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
1d142804 726 ifap = &ifa->if_next;
1da177e4
LT		 727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
e041c683 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
c346dca1 754 struct net *net = dev_net(ifp->idev->dev);
1da177e4 755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 756 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4
LT		 757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
e0a1ad73 760 ip6_del_rt(rt);
1da177e4
LT		 761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771}
772
773#ifdef CONFIG_IPV6_PRIVACY
774static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775{
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
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;
7cbca67c 912 unsigned int prefs;
a9b05723 913};
072047e4 914
b6f99a21 915static inline int ipv6_saddr_preferred(int type)
1da177e4 916{
072047e4
YH		 917 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
918 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
919 return 1;
920 return 0;
1da177e4
LT		 921}
922
a9b05723
YH		 923static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
924 struct ipv6_saddr_dst *dst,
925 int i)
926{
927 int ret;
928
929 if (i <= score->rule) {
930 switch (i) {
931 case IPV6_SADDR_RULE_SCOPE:
932 ret = score->scopedist;
933 break;
934 case IPV6_SADDR_RULE_PREFIX:
935 ret = score->matchlen;
936 break;
937 default:
938 ret = !!test_bit(i, score->scorebits);
939 }
940 goto out;
941 }
942
943 switch (i) {
944 case IPV6_SADDR_RULE_INIT:
945 /* Rule 0: remember if hiscore is not ready yet */
946 ret = !!score->ifa;
947 break;
948 case IPV6_SADDR_RULE_LOCAL:
949 /* Rule 1: Prefer same address */
950 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
951 break;
952 case IPV6_SADDR_RULE_SCOPE:
953 /* Rule 2: Prefer appropriate scope
954 *
955 * ret
956 * ^
957 * -1 | d 15
958 * ---+--+-+---> scope
959 * |
960 * | d is scope of the destination.
961 * B-d | \
962 * | \ <- smaller scope is better if
963 * B-15 | \ if scope is enough for destinaion.
964 * | ret = B - scope (-1 <= scope >= d <= 15).
965 * d-C-1 | /
966 * |/ <- greater is better
967 * -C / if scope is not enough for destination.
968 * /| ret = scope - C (-1 <= d < scope <= 15).
969 *
970 * d - C - 1 < B -15 (for all -1 <= d <= 15).
971 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
972 * Assume B = 0 and we get C > 29.
973 */
974 ret = __ipv6_addr_src_scope(score->addr_type);
975 if (ret >= dst->scope)
976 ret = -ret;
977 else
978 ret -= 128; /* 30 is enough */
979 score->scopedist = ret;
980 break;
981 case IPV6_SADDR_RULE_PREFERRED:
982 /* Rule 3: Avoid deprecated and optimistic addresses */
983 ret = ipv6_saddr_preferred(score->addr_type) ||
984 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
985 break;
986#ifdef CONFIG_IPV6_MIP6
987 case IPV6_SADDR_RULE_HOA:
7cbca67c 988 {
a9b05723 989 /* Rule 4: Prefer home address */
7cbca67c
YH		 990 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
991 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 992 break;
7cbca67c 993 }
a9b05723
YH		 994#endif
995 case IPV6_SADDR_RULE_OIF:
996 /* Rule 5: Prefer outgoing interface */
997 ret = (!dst->ifindex ||
998 dst->ifindex == score->ifa->idev->dev->ifindex);
999 break;
1000 case IPV6_SADDR_RULE_LABEL:
1001 /* Rule 6: Prefer matching label */
1002 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1003 score->ifa->idev->dev->ifindex) == dst->label;
1004 break;
1005#ifdef CONFIG_IPV6_PRIVACY
1006 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1007 {
a9b05723
YH		 1008 /* Rule 7: Prefer public address
1009 * Note: prefer temprary address if use_tempaddr >= 2
1010 */
7cbca67c
YH		 1011 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1012 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1013 score->ifa->idev->cnf.use_tempaddr >= 2;
1014 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1015 break;
7cbca67c 1016 }
a9b05723
YH		 1017#endif
1018 case IPV6_SADDR_RULE_ORCHID:
1019 /* Rule 8-: Prefer ORCHID vs ORCHID or
1020 * non-ORCHID vs non-ORCHID
1021 */
1022 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1023 ipv6_addr_orchid(dst->addr));
1024 break;
1025 case IPV6_SADDR_RULE_PREFIX:
1026 /* Rule 8: Use longest matching prefix */
1027 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1028 dst->addr);
1029 break;
1030 default:
1031 ret = 0;
1032 }
1033
1034 if (ret)
1035 __set_bit(i, score->scorebits);
1036 score->rule = i;
1037out:
1038 return ret;
1039}
1040
1041int ipv6_dev_get_saddr(struct net_device *dst_dev,
7cbca67c
YH		 1042 struct in6_addr *daddr, unsigned int prefs,
1043 struct in6_addr *saddr)
1da177e4 1044{
a9b05723
YH		 1045 struct ipv6_saddr_score scores[2],
1046 *score = &scores[0], *hiscore = &scores[1];
c346dca1 1047 struct net *net = dev_net(dst_dev);
a9b05723 1048 struct ipv6_saddr_dst dst;
072047e4 1049 struct net_device *dev;
a9b05723 1050 int dst_type;
1da177e4 1051
a9b05723
YH		 1052 dst_type = __ipv6_addr_type(daddr);
1053 dst.addr = daddr;
1054 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1055 dst.scope = __ipv6_addr_src_scope(dst_type);
1056 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
7cbca67c 1057 dst.prefs = prefs;
a9b05723
YH		 1058
1059 hiscore->rule = -1;
1060 hiscore->ifa = NULL;
1da177e4 1061
072047e4 1062 read_lock(&dev_base_lock);
8814c4b5 1063 rcu_read_lock();
1da177e4 1064
6fda7350 1065 for_each_netdev(net, dev) {
072047e4 1066 struct inet6_dev *idev;
072047e4 1067
a9b05723 1068 /* Candidate Source Address (section 4)
072047e4
YH		 1069 * - multicast and link-local destination address,
1070 * the set of candidate source address MUST only
1071 * include addresses assigned to interfaces
1072 * belonging to the same link as the outgoing
1073 * interface.
1074 * (- For site-local destination addresses, the
1075 * set of candidate source addresses MUST only
1076 * include addresses assigned to interfaces
1077 * belonging to the same site as the outgoing
1078 * interface.)
1079 */
a9b05723
YH		 1080 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1081 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1082 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1083 continue;
1da177e4 1084
1da177e4 1085 idev = __in6_dev_get(dev);
072047e4
YH		 1086 if (!idev)
1087 continue;
1088
1089 read_lock_bh(&idev->lock);
a9b05723
YH		 1090 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1091 int i;
072047e4 1092
a9b05723 1093 /*
6b3ae80a
YH		 1094 * - Tentative Address (RFC2462 section 5.4)
1095 * - A tentative address is not considered
1096 * "assigned to an interface" in the traditional
95c385b4 1097 * sense, unless it is also flagged as optimistic.
6b3ae80a 1098 * - Candidate Source Address (section 4)
072047e4
YH		 1099 * - In any case, anycast addresses, multicast
1100 * addresses, and the unspecified address MUST
1101 * NOT be included in a candidate set.
1102 */
a9b05723
YH		 1103 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1104 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1105 continue;
a9b05723
YH		 1106
1107 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1108
1109 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1110 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1111 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1112 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1113 "assigned as unicast address on %s",
1114 dev->name);
1115 continue;
1116 }
1117
a9b05723
YH		 1118 score->rule = -1;
1119 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1120
1121 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1122 int minihiscore, miniscore;
1123
1124 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1125 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1126
1127 if (minihiscore > miniscore) {
1128 if (i == IPV6_SADDR_RULE_SCOPE &&
1129 score->scopedist > 0) {
1130 /*
1131 * special case:
1132 * each remaining entry
1133 * has too small (not enough)
1134 * scope, because ifa entries
1135 * are sorted by their scope
1136 * values.
1137 */
1138 goto try_nextdev;
1139 }
1140 break;
1141 } else if (minihiscore < miniscore) {
1142 struct ipv6_saddr_score *tmp;
1143
1144 if (hiscore->ifa)
1145 in6_ifa_put(hiscore->ifa);
1146
1147 in6_ifa_hold(score->ifa);
1148
1149 tmp = hiscore;
1150 hiscore = score;
1151 score = tmp;
1152
1153 /* restore our iterator */
1154 score->ifa = hiscore->ifa;
1155
1156 break;
1da177e4 1157 }
072047e4 1158 }
1da177e4 1159 }
a9b05723 1160try_nextdev:
072047e4 1161 read_unlock_bh(&idev->lock);
1da177e4 1162 }
8814c4b5 1163 rcu_read_unlock();
1da177e4
LT		 1164 read_unlock(&dev_base_lock);
1165
a9b05723 1166 if (!hiscore->ifa)
072047e4 1167 return -EADDRNOTAVAIL;
1ab1457c 1168
a9b05723
YH		 1169 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1170 in6_ifa_put(hiscore->ifa);
072047e4 1171 return 0;
1da177e4
LT		 1172}
1173
5e5f3f0f 1174EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1175
95c385b4
NH		 1176int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1177 unsigned char banned_flags)
1da177e4
LT		 1178{
1179 struct inet6_dev *idev;
1180 int err = -EADDRNOTAVAIL;
1181
8814c4b5 1182 rcu_read_lock();
1da177e4
LT		 1183 if ((idev = __in6_dev_get(dev)) != NULL) {
1184 struct inet6_ifaddr *ifp;
1185
1186 read_lock_bh(&idev->lock);
1187 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1188 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1189 ipv6_addr_copy(addr, &ifp->addr);
1190 err = 0;
1191 break;
1192 }
1193 }
1194 read_unlock_bh(&idev->lock);
1195 }
8814c4b5 1196 rcu_read_unlock();
1da177e4
LT		 1197 return err;
1198}
1199
1200static int ipv6_count_addresses(struct inet6_dev *idev)
1201{
1202 int cnt = 0;
1203 struct inet6_ifaddr *ifp;
1204
1205 read_lock_bh(&idev->lock);
1206 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1207 cnt++;
1208 read_unlock_bh(&idev->lock);
1209 return cnt;
1210}
1211
bfeade08
DL		 1212int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1213 struct net_device *dev, int strict)
1da177e4
LT		 1214{
1215 struct inet6_ifaddr * ifp;
1216 u8 hash = ipv6_addr_hash(addr);
1217
1218 read_lock_bh(&addrconf_hash_lock);
1219 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1220 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1221 continue;
1da177e4
LT		 1222 if (ipv6_addr_equal(&ifp->addr, addr) &&
1223 !(ifp->flags&IFA_F_TENTATIVE)) {
1224 if (dev == NULL || ifp->idev->dev == dev ||
1225 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1226 break;
1227 }
1228 }
1229 read_unlock_bh(&addrconf_hash_lock);
1230 return ifp != NULL;
1231}
7159039a
YH		 1232EXPORT_SYMBOL(ipv6_chk_addr);
1233
1da177e4 1234static
06bfe655
DL		 1235int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1236 struct net_device *dev)
1da177e4
LT		 1237{
1238 struct inet6_ifaddr * ifp;
1239 u8 hash = ipv6_addr_hash(addr);
1240
1241 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1242 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1243 continue;
1da177e4
LT		 1244 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245 if (dev == NULL || ifp->idev->dev == dev)
1246 break;
1247 }
1248 }
1249 return ifp != NULL;
1250}
1251
52eeeb84
YH		 1252int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1253{
1254 struct inet6_dev *idev;
1255 struct inet6_ifaddr *ifa;
1256 int onlink;
1257
1258 onlink = 0;
1259 rcu_read_lock();
1260 idev = __in6_dev_get(dev);
1261 if (idev) {
1262 read_lock_bh(&idev->lock);
1263 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1264 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1265 ifa->prefix_len);
1266 if (onlink)
1267 break;
1268 }
1269 read_unlock_bh(&idev->lock);
1270 }
1271 rcu_read_unlock();
1272 return onlink;
1273}
1274
1275EXPORT_SYMBOL(ipv6_chk_prefix);
1276
1cab3da6
DL		 1277struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1278 struct net_device *dev, int strict)
1da177e4
LT		 1279{
1280 struct inet6_ifaddr * ifp;
1281 u8 hash = ipv6_addr_hash(addr);
1282
1283 read_lock_bh(&addrconf_hash_lock);
1284 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1285 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1286 continue;
1da177e4
LT		 1287 if (ipv6_addr_equal(&ifp->addr, addr)) {
1288 if (dev == NULL || ifp->idev->dev == dev ||
1289 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1290 in6_ifa_hold(ifp);
1291 break;
1292 }
1293 }
1294 }
1295 read_unlock_bh(&addrconf_hash_lock);
1296
1297 return ifp;
1298}
1299
1300int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1301{
1302 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1303 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1304 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1305 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1306 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1307 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1308 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1309 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1310
1311 if (!sk2_rcv_saddr && !sk_ipv6only)
1312 return 1;
1313
1314 if (addr_type2 == IPV6_ADDR_ANY &&
1315 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1316 return 1;
1317
1318 if (addr_type == IPV6_ADDR_ANY &&
1319 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1320 return 1;
1321
1322 if (sk2_rcv_saddr6 &&
1323 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1324 return 1;
1325
1326 if (addr_type == IPV6_ADDR_MAPPED &&
1327 !sk2_ipv6only &&
1328 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1329 return 1;
1330
1331 return 0;
1332}
1333
1334/* Gets referenced address, destroys ifaddr */
1335
9f5336e2 1336static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1337{
1da177e4
LT		 1338 if (ifp->flags&IFA_F_PERMANENT) {
1339 spin_lock_bh(&ifp->lock);
1340 addrconf_del_timer(ifp);
1341 ifp->flags |= IFA_F_TENTATIVE;
1342 spin_unlock_bh(&ifp->lock);
1343 in6_ifa_put(ifp);
1344#ifdef CONFIG_IPV6_PRIVACY
1345 } else if (ifp->flags&IFA_F_TEMPORARY) {
1346 struct inet6_ifaddr *ifpub;
1347 spin_lock_bh(&ifp->lock);
1348 ifpub = ifp->ifpub;
1349 if (ifpub) {
1350 in6_ifa_hold(ifpub);
1351 spin_unlock_bh(&ifp->lock);
1352 ipv6_create_tempaddr(ifpub, ifp);
1353 in6_ifa_put(ifpub);
1354 } else {
1355 spin_unlock_bh(&ifp->lock);
1356 }
1357 ipv6_del_addr(ifp);
1358#endif
1359 } else
1360 ipv6_del_addr(ifp);
1361}
1362
3c21edbd
YH		 1363void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1364{
1365 if (net_ratelimit())
1366 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1367 addrconf_dad_stop(ifp);
1368}
1da177e4
LT		 1369
1370/* Join to solicited addr multicast group. */
1371
1372void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1373{
1374 struct in6_addr maddr;
1375
1376 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1377 return;
1378
1379 addrconf_addr_solict_mult(addr, &maddr);
1380 ipv6_dev_mc_inc(dev, &maddr);
1381}
1382
1383void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1384{
1385 struct in6_addr maddr;
1386
1387 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1388 return;
1389
1390 addrconf_addr_solict_mult(addr, &maddr);
1391 __ipv6_dev_mc_dec(idev, &maddr);
1392}
1393
20380731 1394static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1395{
1396 struct in6_addr addr;
1397 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1398 if (ipv6_addr_any(&addr))
1399 return;
1400 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1401}
1402
20380731 1403static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1404{
1405 struct in6_addr addr;
1406 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1407 if (ipv6_addr_any(&addr))
1408 return;
1409 __ipv6_dev_ac_dec(ifp->idev, &addr);
1410}
1411
073a8e0e
YH		 1412static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1413{
1414 if (dev->addr_len != ETH_ALEN)
1415 return -1;
1416 memcpy(eui, dev->dev_addr, 3);
1417 memcpy(eui + 5, dev->dev_addr + 3, 3);
1418
1419 /*
1420 * The zSeries OSA network cards can be shared among various
1421 * OS instances, but the OSA cards have only one MAC address.
1422 * This leads to duplicate address conflicts in conjunction
1423 * with IPv6 if more than one instance uses the same card.
1424 *
1425 * The driver for these cards can deliver a unique 16-bit
1426 * identifier for each instance sharing the same card. It is
1427 * placed instead of 0xFFFE in the interface identifier. The
1428 * "u" bit of the interface identifier is not inverted in this
1429 * case. Hence the resulting interface identifier has local
1430 * scope according to RFC2373.
1431 */
1432 if (dev->dev_id) {
1433 eui[3] = (dev->dev_id >> 8) & 0xFF;
1434 eui[4] = dev->dev_id & 0xFF;
1435 } else {
1436 eui[3] = 0xFF;
1437 eui[4] = 0xFE;
1438 eui[0] ^= 2;
1439 }
1440 return 0;
1441}
1442
1443static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1444{
1445 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1446 if (dev->addr_len != ARCNET_ALEN)
1447 return -1;
1448 memset(eui, 0, 7);
1449 eui[7] = *(u8*)dev->dev_addr;
1450 return 0;
1451}
1452
1453static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1454{
1455 if (dev->addr_len != INFINIBAND_ALEN)
1456 return -1;
1457 memcpy(eui, dev->dev_addr + 12, 8);
1458 eui[0] |= 2;
1459 return 0;
1460}
1461
1da177e4
LT		 1462static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1463{
1464 switch (dev->type) {
1465 case ARPHRD_ETHER:
1466 case ARPHRD_FDDI:
1467 case ARPHRD_IEEE802_TR:
073a8e0e 1468 return addrconf_ifid_eui48(eui, dev);
1da177e4 1469 case ARPHRD_ARCNET:
073a8e0e 1470 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1471 case ARPHRD_INFINIBAND:
073a8e0e 1472 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1473 case ARPHRD_SIT:
1474 if (dev->priv_flags & IFF_ISATAP)
1475 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1476 }
1477 return -1;
1478}
1479
1480static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1481{
1482 int err = -1;
1483 struct inet6_ifaddr *ifp;
1484
1485 read_lock_bh(&idev->lock);
1486 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1487 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1488 memcpy(eui, ifp->addr.s6_addr+8, 8);
1489 err = 0;
1490 break;
1491 }
1492 }
1493 read_unlock_bh(&idev->lock);
1494 return err;
1495}
1496
1497#ifdef CONFIG_IPV6_PRIVACY
1498/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1499static int __ipv6_regen_rndid(struct inet6_dev *idev)
1500{
1da177e4 1501regen:
955189ef 1502 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1503 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1504
1505 /*
1506 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1507 * check if generated address is not inappropriate
1508 *
1509 * - Reserved subnet anycast (RFC 2526)
1510 * 11111101 11....11 1xxxxxxx
c7dc89c0 1511 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1512 * 00-00-5E-FE-xx-xx-xx-xx
1513 * - value 0
1514 * - XXX: already assigned to an address on the device
1515 */
1ab1457c 1516 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1517 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1518 (idev->rndid[7]&0x80))
1519 goto regen;
1520 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1521 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1522 goto regen;
1523 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1524 goto regen;
1525 }
1526
1527 return 0;
1528}
1529
1530static void ipv6_regen_rndid(unsigned long data)
1531{
1532 struct inet6_dev *idev = (struct inet6_dev *) data;
1533 unsigned long expires;
1534
8814c4b5 1535 rcu_read_lock_bh();
1da177e4
LT		 1536 write_lock_bh(&idev->lock);
1537
1538 if (idev->dead)
1539 goto out;
1540
1541 if (__ipv6_regen_rndid(idev) < 0)
1542 goto out;
1ab1457c 1543
1da177e4 1544 expires = jiffies +
1ab1457c 1545 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1546 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1547 if (time_before(expires, jiffies)) {
1548 printk(KERN_WARNING
1549 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1550 idev->dev->name);
1551 goto out;
1552 }
1553
1554 if (!mod_timer(&idev->regen_timer, expires))
1555 in6_dev_hold(idev);
1556
1557out:
1558 write_unlock_bh(&idev->lock);
8814c4b5 1559 rcu_read_unlock_bh();
1da177e4
LT		 1560 in6_dev_put(idev);
1561}
1562
1563static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1564 int ret = 0;
1565
1566 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1567 ret = __ipv6_regen_rndid(idev);
1568 return ret;
1569}
1570#endif
1571
1572/*
1573 * Add prefix route.
1574 */
1575
1576static void
1577addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1578 unsigned long expires, u32 flags)
1da177e4 1579{
86872cb5
TG		 1580 struct fib6_config cfg = {
1581 .fc_table = RT6_TABLE_PREFIX,
1582 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583 .fc_ifindex = dev->ifindex,
1584 .fc_expires = expires,
1585 .fc_dst_len = plen,
1586 .fc_flags = RTF_UP | flags,
c346dca1 1587 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1588 };
1da177e4 1589
86872cb5 1590 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1591
1592 /* Prevent useless cloning on PtP SIT.
1593 This thing is done here expecting that the whole
1594 class of non-broadcast devices need not cloning.
1595 */
0be669bb 1596#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1597 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1598 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1599#endif
1da177e4 1600
86872cb5 1601 ip6_route_add(&cfg);
1da177e4
LT		 1602}
1603
1604/* Create "default" multicast route to the interface */
1605
1606static void addrconf_add_mroute(struct net_device *dev)
1607{
86872cb5
TG		 1608 struct fib6_config cfg = {
1609 .fc_table = RT6_TABLE_LOCAL,
1610 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1611 .fc_ifindex = dev->ifindex,
1612 .fc_dst_len = 8,
1613 .fc_flags = RTF_UP,
c346dca1 1614 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1615 };
1616
1617 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1618
1619 ip6_route_add(&cfg);
1da177e4
LT		 1620}
1621
0be669bb 1622#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1623static void sit_route_add(struct net_device *dev)
1624{
86872cb5
TG		 1625 struct fib6_config cfg = {
1626 .fc_table = RT6_TABLE_MAIN,
1627 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1628 .fc_ifindex = dev->ifindex,
1629 .fc_dst_len = 96,
1630 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1631 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1632 };
1da177e4
LT		 1633
1634 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1635 ip6_route_add(&cfg);
1da177e4 1636}
0be669bb 1637#endif
1da177e4
LT		 1638
1639static void addrconf_add_lroute(struct net_device *dev)
1640{
1641 struct in6_addr addr;
1642
1643 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1644 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1645}
1646
1647static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1648{
1649 struct inet6_dev *idev;
1650
1651 ASSERT_RTNL();
1652
1653 if ((idev = ipv6_find_idev(dev)) == NULL)
1654 return NULL;
1655
1656 /* Add default multicast route */
1657 addrconf_add_mroute(dev);
1658
1659 /* Add link local route */
1660 addrconf_add_lroute(dev);
1661 return idev;
1662}
1663
1664void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1665{
1666 struct prefix_info *pinfo;
1667 __u32 valid_lft;
1668 __u32 prefered_lft;
1669 int addr_type;
1670 unsigned long rt_expires;
1671 struct inet6_dev *in6_dev;
1672
1673 pinfo = (struct prefix_info *) opt;
1ab1457c 1674
1da177e4
LT		 1675 if (len < sizeof(struct prefix_info)) {
1676 ADBG(("addrconf: prefix option too short\n"));
1677 return;
1678 }
1ab1457c 1679
1da177e4
LT		 1680 /*
1681 * Validation checks ([ADDRCONF], page 19)
1682 */
1683
1684 addr_type = ipv6_addr_type(&pinfo->prefix);
1685
1686 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1687 return;
1688
1689 valid_lft = ntohl(pinfo->valid);
1690 prefered_lft = ntohl(pinfo->prefered);
1691
1692 if (prefered_lft > valid_lft) {
1693 if (net_ratelimit())
1694 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1695 return;
1696 }
1697
1698 in6_dev = in6_dev_get(dev);
1699
1700 if (in6_dev == NULL) {
1701 if (net_ratelimit())
1702 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1703 return;
1704 }
1705
1706 /*
1707 * Two things going on here:
1708 * 1) Add routes for on-link prefixes
1709 * 2) Configure prefixes with the auto flag set
1710 */
1711
1712 /* Avoid arithmetic overflow. Really, we could
1713 save rt_expires in seconds, likely valid_lft,
1714 but it would require division in fib gc, that it
1715 not good.
1716 */
1717 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1718 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1719 else
3dd4bc68
YH		 1720 rt_expires = valid_lft * HZ;
1721
1722 /*
1723 * We convert this (in jiffies) to clock_t later.
1724 * Avoid arithmetic overflow there as well.
1725 * Overflow can happen only if HZ < USER_HZ.
1726 */
1727 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1728 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1729
1730 if (pinfo->onlink) {
1731 struct rt6_info *rt;
c346dca1 1732 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1733 dev->ifindex, 1);
1da177e4
LT		 1734
1735 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1736 if (rt->rt6i_flags&RTF_EXPIRES) {
1737 if (valid_lft == 0) {
e0a1ad73 1738 ip6_del_rt(rt);
1da177e4
LT		 1739 rt = NULL;
1740 } else {
3dd4bc68 1741 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1742 }
1743 }
1744 } else if (valid_lft) {
1745 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1746 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1747 }
1748 if (rt)
1749 dst_release(&rt->u.dst);
1750 }
1751
1752 /* Try to figure out our local address for this prefix */
1753
1754 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1755 struct inet6_ifaddr * ifp;
1756 struct in6_addr addr;
1757 int create = 0, update_lft = 0;
1758
1759 if (pinfo->prefix_len == 64) {
1760 memcpy(&addr, &pinfo->prefix, 8);
1761 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1762 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1763 in6_dev_put(in6_dev);
1764 return;
1765 }
1766 goto ok;
1767 }
1768 if (net_ratelimit())
1769 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1770 pinfo->prefix_len);
1771 in6_dev_put(in6_dev);
1772 return;
1773
1774ok:
1775
c346dca1 1776 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1da177e4
LT		 1777
1778 if (ifp == NULL && valid_lft) {
1779 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1780 u32 addr_flags = 0;
1781
1782#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1783 if (in6_dev->cnf.optimistic_dad &&
1784 !ipv6_devconf.forwarding)
1785 addr_flags = IFA_F_OPTIMISTIC;
1786#endif
1da177e4
LT		 1787
1788 /* Do not allow to create too much of autoconfigured
1789 * addresses; this would be too easy way to crash kernel.
1790 */
1791 if (!max_addresses ||
1792 ipv6_count_addresses(in6_dev) < max_addresses)
1793 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1794 addr_type&IPV6_ADDR_SCOPE_MASK,
1795 addr_flags);
1da177e4
LT		 1796
1797 if (!ifp || IS_ERR(ifp)) {
1798 in6_dev_put(in6_dev);
1799 return;
1800 }
1801
1802 update_lft = create = 1;
1803 ifp->cstamp = jiffies;
1804 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1805 }
1806
1807 if (ifp) {
1808 int flags;
1809 unsigned long now;
1810#ifdef CONFIG_IPV6_PRIVACY
1811 struct inet6_ifaddr *ift;
1812#endif
1813 u32 stored_lft;
1814
1815 /* update lifetime (RFC2462 5.5.3 e) */
1816 spin_lock(&ifp->lock);
1817 now = jiffies;
1818 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1819 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1820 else
1821 stored_lft = 0;
1822 if (!update_lft && stored_lft) {
1823 if (valid_lft > MIN_VALID_LIFETIME ||
1824 valid_lft > stored_lft)
1825 update_lft = 1;
1826 else if (stored_lft <= MIN_VALID_LIFETIME) {
1827 /* valid_lft <= stored_lft is always true */
1828 /* XXX: IPsec */
1829 update_lft = 0;
1830 } else {
1831 valid_lft = MIN_VALID_LIFETIME;
1832 if (valid_lft < prefered_lft)
1833 prefered_lft = valid_lft;
1834 update_lft = 1;
1835 }
1836 }
1837
1838 if (update_lft) {
1839 ifp->valid_lft = valid_lft;
1840 ifp->prefered_lft = prefered_lft;
1841 ifp->tstamp = now;
1842 flags = ifp->flags;
1843 ifp->flags &= ~IFA_F_DEPRECATED;
1844 spin_unlock(&ifp->lock);
1845
1846 if (!(flags&IFA_F_TENTATIVE))
1847 ipv6_ifa_notify(0, ifp);
1848 } else
1849 spin_unlock(&ifp->lock);
1850
1851#ifdef CONFIG_IPV6_PRIVACY
1852 read_lock_bh(&in6_dev->lock);
1853 /* update all temporary addresses in the list */
1854 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1855 /*
1856 * When adjusting the lifetimes of an existing
1857 * temporary address, only lower the lifetimes.
1858 * Implementations must not increase the
1859 * lifetimes of an existing temporary address
1860 * when processing a Prefix Information Option.
1861 */
1862 spin_lock(&ift->lock);
1863 flags = ift->flags;
1864 if (ift->valid_lft > valid_lft &&
1865 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1866 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1867 if (ift->prefered_lft > prefered_lft &&
1868 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1869 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1870 spin_unlock(&ift->lock);
1871 if (!(flags&IFA_F_TENTATIVE))
1872 ipv6_ifa_notify(0, ift);
1873 }
1874
1875 if (create && in6_dev->cnf.use_tempaddr > 0) {
1876 /*
1877 * When a new public address is created as described in [ADDRCONF],
1878 * also create a new temporary address.
1879 */
1ab1457c 1880 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1881 ipv6_create_tempaddr(ifp, NULL);
1882 } else {
1883 read_unlock_bh(&in6_dev->lock);
1884 }
1885#endif
1886 in6_ifa_put(ifp);
1887 addrconf_verify(0);
1888 }
1889 }
1890 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1891 in6_dev_put(in6_dev);
1892}
1893
1894/*
1895 * Set destination address.
1896 * Special case for SIT interfaces where we create a new "virtual"
1897 * device.
1898 */
af284937 1899int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 1900{
1901 struct in6_ifreq ireq;
1902 struct net_device *dev;
1903 int err = -EINVAL;
1904
1905 rtnl_lock();
1906
1907 err = -EFAULT;
1908 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1909 goto err_exit;
1910
af284937 1911 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 1912
1913 err = -ENODEV;
1914 if (dev == NULL)
1915 goto err_exit;
1916
0be669bb 1917#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1918 if (dev->type == ARPHRD_SIT) {
1919 struct ifreq ifr;
1920 mm_segment_t oldfs;
1921 struct ip_tunnel_parm p;
1922
1923 err = -EADDRNOTAVAIL;
1924 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1925 goto err_exit;
1926
1927 memset(&p, 0, sizeof(p));
1928 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1929 p.iph.saddr = 0;
1930 p.iph.version = 4;
1931 p.iph.ihl = 5;
1932 p.iph.protocol = IPPROTO_IPV6;
1933 p.iph.ttl = 64;
d20b3109 1934 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1935
1936 oldfs = get_fs(); set_fs(KERNEL_DS);
1937 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1938 set_fs(oldfs);
1939
1940 if (err == 0) {
1941 err = -ENOBUFS;
af284937
DL		 1942 dev = __dev_get_by_name(net, p.name);
1943 if (!dev)
1da177e4
LT		 1944 goto err_exit;
1945 err = dev_open(dev);
1946 }
1947 }
0be669bb 1948#endif
1da177e4
LT		 1949
1950err_exit:
1951 rtnl_unlock();
1952 return err;
1953}
1954
1955/*
1956 * Manual configuration of address on an interface
1957 */
af284937
DL		 1958static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1959 int plen, __u8 ifa_flags, __u32 prefered_lft,
1960 __u32 valid_lft)
1da177e4
LT		 1961{
1962 struct inet6_ifaddr *ifp;
1963 struct inet6_dev *idev;
1964 struct net_device *dev;
1965 int scope;
46d48046 1966 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1967
1968 ASSERT_RTNL();
1ab1457c 1969
0778769d
NT		 1970 /* check the lifetime */
1971 if (!valid_lft || prefered_lft > valid_lft)
1972 return -EINVAL;
1973
af284937
DL		 1974 dev = __dev_get_by_index(net, ifindex);
1975 if (!dev)
1da177e4 1976 return -ENODEV;
1ab1457c 1977
1da177e4
LT		 1978 if ((idev = addrconf_add_dev(dev)) == NULL)
1979 return -ENOBUFS;
1980
1981 scope = ipv6_addr_scope(pfx);
1982
46d48046 1983 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1984 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1985 flags = 0;
1986 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1987 valid_lft = 0x7FFFFFFF/HZ;
1988
1989 if (prefered_lft == 0)
1990 ifa_flags |= IFA_F_DEPRECATED;
1991 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1992 (prefered_lft != INFINITY_LIFE_TIME))
1993 prefered_lft = 0x7FFFFFFF/HZ;
1994
1995 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1996
1da177e4 1997 if (!IS_ERR(ifp)) {
06aebfb7 1998 spin_lock_bh(&ifp->lock);
0778769d
NT		 1999 ifp->valid_lft = valid_lft;
2000 ifp->prefered_lft = prefered_lft;
2001 ifp->tstamp = jiffies;
06aebfb7 2002 spin_unlock_bh(&ifp->lock);
0778769d 2003
46d48046
YH		 2004 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2005 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 2006 /*
2007 * Note that section 3.1 of RFC 4429 indicates
2008 * that the Optimistic flag should not be set for
2009 * manually configured addresses
2010 */
1da177e4
LT		 2011 addrconf_dad_start(ifp, 0);
2012 in6_ifa_put(ifp);
0778769d 2013 addrconf_verify(0);
1da177e4
LT		 2014 return 0;
2015 }
2016
2017 return PTR_ERR(ifp);
2018}
2019
af284937
DL		 2020static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2021 int plen)
1da177e4
LT		 2022{
2023 struct inet6_ifaddr *ifp;
2024 struct inet6_dev *idev;
2025 struct net_device *dev;
1ab1457c 2026
af284937
DL		 2027 dev = __dev_get_by_index(net, ifindex);
2028 if (!dev)
1da177e4
LT		 2029 return -ENODEV;
2030
2031 if ((idev = __in6_dev_get(dev)) == NULL)
2032 return -ENXIO;
2033
2034 read_lock_bh(&idev->lock);
2035 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2036 if (ifp->prefix_len == plen &&
2037 ipv6_addr_equal(pfx, &ifp->addr)) {
2038 in6_ifa_hold(ifp);
2039 read_unlock_bh(&idev->lock);
1ab1457c 2040
1da177e4
LT		 2041 ipv6_del_addr(ifp);
2042
2043 /* If the last address is deleted administratively,
2044 disable IPv6 on this interface.
2045 */
2046 if (idev->addr_list == NULL)
2047 addrconf_ifdown(idev->dev, 1);
2048 return 0;
2049 }
2050 }
2051 read_unlock_bh(&idev->lock);
2052 return -EADDRNOTAVAIL;
2053}
2054
2055
af284937 2056int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2057{
2058 struct in6_ifreq ireq;
2059 int err;
1ab1457c 2060
1da177e4
LT		 2061 if (!capable(CAP_NET_ADMIN))
2062 return -EPERM;
1ab1457c 2063
1da177e4
LT		 2064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2065 return -EFAULT;
2066
2067 rtnl_lock();
af284937
DL		 2068 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2069 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2070 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2071 rtnl_unlock();
2072 return err;
2073}
2074
af284937 2075int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2076{
2077 struct in6_ifreq ireq;
2078 int err;
1ab1457c 2079
1da177e4
LT		 2080 if (!capable(CAP_NET_ADMIN))
2081 return -EPERM;
2082
2083 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2084 return -EFAULT;
2085
2086 rtnl_lock();
af284937
DL		 2087 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2088 ireq.ifr6_prefixlen);
1da177e4
LT		 2089 rtnl_unlock();
2090 return err;
2091}
2092
0be669bb 2093#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2094static void sit_add_v4_addrs(struct inet6_dev *idev)
2095{
2096 struct inet6_ifaddr * ifp;
2097 struct in6_addr addr;
2098 struct net_device *dev;
c346dca1 2099 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2100 int scope;
2101
2102 ASSERT_RTNL();
2103
2104 memset(&addr, 0, sizeof(struct in6_addr));
2105 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2106
2107 if (idev->dev->flags&IFF_POINTOPOINT) {
2108 addr.s6_addr32[0] = htonl(0xfe800000);
2109 scope = IFA_LINK;
2110 } else {
2111 scope = IPV6_ADDR_COMPATv4;
2112 }
2113
2114 if (addr.s6_addr32[3]) {
2115 ifp = ipv6_add_addr(idev, &addr, 128, scope, 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 return;
2124 }
2125
6fda7350 2126 for_each_netdev(net, dev) {
e5ed6399 2127 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2128 if (in_dev && (dev->flags & IFF_UP)) {
2129 struct in_ifaddr * ifa;
2130
2131 int flag = scope;
2132
2133 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2134 int plen;
2135
2136 addr.s6_addr32[3] = ifa->ifa_local;
2137
2138 if (ifa->ifa_scope == RT_SCOPE_LINK)
2139 continue;
2140 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2141 if (idev->dev->flags&IFF_POINTOPOINT)
2142 continue;
2143 flag |= IFA_HOST;
2144 }
2145 if (idev->dev->flags&IFF_POINTOPOINT)
2146 plen = 64;
2147 else
2148 plen = 96;
2149
2150 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2151 IFA_F_PERMANENT);
2152 if (!IS_ERR(ifp)) {
2153 spin_lock_bh(&ifp->lock);
2154 ifp->flags &= ~IFA_F_TENTATIVE;
2155 spin_unlock_bh(&ifp->lock);
2156 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2157 in6_ifa_put(ifp);
2158 }
2159 }
2160 }
1ab1457c 2161 }
1da177e4 2162}
0be669bb 2163#endif
1da177e4
LT		 2164
2165static void init_loopback(struct net_device *dev)
2166{
2167 struct inet6_dev *idev;
2168 struct inet6_ifaddr * ifp;
2169
2170 /* ::1 */
2171
2172 ASSERT_RTNL();
2173
2174 if ((idev = ipv6_find_idev(dev)) == NULL) {
2175 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2176 return;
2177 }
2178
2179 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2180 if (!IS_ERR(ifp)) {
2181 spin_lock_bh(&ifp->lock);
2182 ifp->flags &= ~IFA_F_TENTATIVE;
2183 spin_unlock_bh(&ifp->lock);
2184 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2185 in6_ifa_put(ifp);
2186 }
2187}
2188
2189static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2190{
2191 struct inet6_ifaddr * ifp;
95c385b4
NH		 2192 u32 addr_flags = IFA_F_PERMANENT;
2193
2194#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2195 if (idev->cnf.optimistic_dad &&
2196 !ipv6_devconf.forwarding)
2197 addr_flags |= IFA_F_OPTIMISTIC;
2198#endif
1da177e4 2199
95c385b4
NH		 2200
2201 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2202 if (!IS_ERR(ifp)) {
46d48046 2203 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2204 addrconf_dad_start(ifp, 0);
2205 in6_ifa_put(ifp);
2206 }
2207}
2208
2209static void addrconf_dev_config(struct net_device *dev)
2210{
2211 struct in6_addr addr;
2212 struct inet6_dev * idev;
2213
2214 ASSERT_RTNL();
2215
74235a25
HX		 2216 if ((dev->type != ARPHRD_ETHER) &&
2217 (dev->type != ARPHRD_FDDI) &&
2218 (dev->type != ARPHRD_IEEE802_TR) &&
2219 (dev->type != ARPHRD_ARCNET) &&
2220 (dev->type != ARPHRD_INFINIBAND)) {
2221 /* Alas, we support only Ethernet autoconfiguration. */
2222 return;
2223 }
2224
1da177e4
LT		 2225 idev = addrconf_add_dev(dev);
2226 if (idev == NULL)
2227 return;
2228
2229 memset(&addr, 0, sizeof(struct in6_addr));
2230 addr.s6_addr32[0] = htonl(0xFE800000);
2231
2232 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2233 addrconf_add_linklocal(idev, &addr);
2234}
2235
0be669bb 2236#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2237static void addrconf_sit_config(struct net_device *dev)
2238{
2239 struct inet6_dev *idev;
2240
2241 ASSERT_RTNL();
2242
1ab1457c
YH		 2243 /*
2244 * Configure the tunnel with one of our IPv4
2245 * addresses... we should configure all of
1da177e4
LT		 2246 * our v4 addrs in the tunnel
2247 */
2248
2249 if ((idev = ipv6_find_idev(dev)) == NULL) {
2250 printk(KERN_DEBUG "init sit: add_dev failed\n");
2251 return;
2252 }
2253
c7dc89c0
FT		 2254 if (dev->priv_flags & IFF_ISATAP) {
2255 struct in6_addr addr;
2256
2257 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2258 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2259 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2260 addrconf_add_linklocal(idev, &addr);
2261 return;
2262 }
2263
1da177e4
LT		 2264 sit_add_v4_addrs(idev);
2265
2266 if (dev->flags&IFF_POINTOPOINT) {
2267 addrconf_add_mroute(dev);
2268 addrconf_add_lroute(dev);
2269 } else
2270 sit_route_add(dev);
2271}
0be669bb 2272#endif
1da177e4
LT		 2273
2274static inline int
2275ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2276{
2277 struct in6_addr lladdr;
2278
95c385b4 2279 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2280 addrconf_add_linklocal(idev, &lladdr);
2281 return 0;
2282 }
2283 return -1;
2284}
2285
2286static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2287{
2288 struct net_device *link_dev;
c346dca1 2289 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2290
2291 /* first try to inherit the link-local address from the link device */
2292 if (idev->dev->iflink &&
6fda7350 2293 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2294 if (!ipv6_inherit_linklocal(idev, link_dev))
2295 return;
2296 }
2297 /* then try to inherit it from any device */
6fda7350 2298 for_each_netdev(net, link_dev) {
1da177e4
LT		 2299 if (!ipv6_inherit_linklocal(idev, link_dev))
2300 return;
2301 }
2302 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2303}
2304
2305/*
2306 * Autoconfigure tunnel with a link-local address so routing protocols,
2307 * DHCPv6, MLD etc. can be run over the virtual link
2308 */
2309
2310static void addrconf_ip6_tnl_config(struct net_device *dev)
2311{
2312 struct inet6_dev *idev;
2313
2314 ASSERT_RTNL();
2315
2316 if ((idev = addrconf_add_dev(dev)) == NULL) {
2317 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2318 return;
2319 }
2320 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2321}
2322
1ab1457c 2323static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2324 void * data)
2325{
2326 struct net_device *dev = (struct net_device *) data;
74235a25 2327 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2328 int run_pending = 0;
b217d616 2329 int err;
1da177e4
LT		 2330
2331 switch(event) {
45ba9dd2 2332 case NETDEV_REGISTER:
74235a25 2333 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2334 idev = ipv6_add_dev(dev);
2335 if (!idev)
b217d616 2336 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2337 }
2338 break;
1da177e4 2339 case NETDEV_UP:
3c21edbd 2340 case NETDEV_CHANGE:
c2edacf8
JV		 2341 if (dev->flags & IFF_SLAVE)
2342 break;
2343
3c21edbd 2344 if (event == NETDEV_UP) {
f24e3d65 2345 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2346 /* device is not ready yet. */
2347 printk(KERN_INFO
2348 "ADDRCONF(NETDEV_UP): %s: "
2349 "link is not ready\n",
2350 dev->name);
2351 break;
2352 }
99081049 2353
d31c7b8f
EP		 2354 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2355 idev = ipv6_add_dev(dev);
2356
99081049
KS		 2357 if (idev)
2358 idev->if_flags |= IF_READY;
3c21edbd 2359 } else {
f24e3d65 2360 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2361 /* device is still not ready. */
2362 break;
2363 }
2364
2365 if (idev) {
2366 if (idev->if_flags & IF_READY) {
2367 /* device is already configured. */
2368 break;
2369 }
2370 idev->if_flags |= IF_READY;
2371 }
2372
2373 printk(KERN_INFO
2374 "ADDRCONF(NETDEV_CHANGE): %s: "
2375 "link becomes ready\n",
2376 dev->name);
2377
c5e33bdd 2378 run_pending = 1;
3c21edbd
YH		 2379 }
2380
1da177e4 2381 switch(dev->type) {
0be669bb 2382#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2383 case ARPHRD_SIT:
2384 addrconf_sit_config(dev);
2385 break;
0be669bb 2386#endif
1da177e4
LT		 2387 case ARPHRD_TUNNEL6:
2388 addrconf_ip6_tnl_config(dev);
2389 break;
2390 case ARPHRD_LOOPBACK:
2391 init_loopback(dev);
2392 break;
2393
2394 default:
2395 addrconf_dev_config(dev);
2396 break;
3ff50b79 2397 }
1da177e4 2398 if (idev) {
c5e33bdd
YH		 2399 if (run_pending)
2400 addrconf_dad_run(idev);
2401
1da177e4
LT		 2402 /* If the MTU changed during the interface down, when the
2403 interface up, the changed MTU must be reflected in the
2404 idev as well as routers.
2405 */
2406 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2407 rt6_mtu_change(dev, dev->mtu);
2408 idev->cnf.mtu6 = dev->mtu;
2409 }
2410 idev->tstamp = jiffies;
2411 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2412 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2413 stop IPv6 on this interface.
2414 */
2415 if (dev->mtu < IPV6_MIN_MTU)
2416 addrconf_ifdown(dev, event != NETDEV_DOWN);
2417 }
2418 break;
2419
2420 case NETDEV_CHANGEMTU:
d31c7b8f 2421 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2422 rt6_mtu_change(dev, dev->mtu);
2423 idev->cnf.mtu6 = dev->mtu;
2424 break;
2425 }
2426
d31c7b8f
EP		 2427 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2428 idev = ipv6_add_dev(dev);
2429 if (idev)
2430 break;
2431 }
2432
1da177e4
LT		 2433 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2434
2435 case NETDEV_DOWN:
2436 case NETDEV_UNREGISTER:
2437 /*
2438 * Remove all addresses from this interface.
2439 */
2440 addrconf_ifdown(dev, event != NETDEV_DOWN);
2441 break;
3c21edbd 2442
1da177e4 2443 case NETDEV_CHANGENAME:
1da177e4 2444 if (idev) {
5632c515 2445 snmp6_unregister_dev(idev);
408c4768 2446 addrconf_sysctl_unregister(idev);
f52295a9 2447 addrconf_sysctl_register(idev);
b217d616
HX		 2448 err = snmp6_register_dev(idev);
2449 if (err)
2450 return notifier_from_errno(err);
5632c515 2451 }
1da177e4 2452 break;
3ff50b79 2453 }
1da177e4
LT		 2454
2455 return NOTIFY_OK;
2456}
2457
2458/*
2459 * addrconf module should be notified of a device going up
2460 */
2461static struct notifier_block ipv6_dev_notf = {
2462 .notifier_call = addrconf_notify,
2463 .priority = 0
2464};
2465
2466static int addrconf_ifdown(struct net_device *dev, int how)
2467{
2468 struct inet6_dev *idev;
2469 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2470 struct net *net = dev_net(dev);
1da177e4
LT		 2471 int i;
2472
2473 ASSERT_RTNL();
2474
2774c7ab 2475 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2476 how = 0;
2477
f3db4851 2478 rt6_ifdown(net, dev);
1da177e4
LT		 2479 neigh_ifdown(&nd_tbl, dev);
2480
2481 idev = __in6_dev_get(dev);
2482 if (idev == NULL)
2483 return -ENODEV;
2484
2485 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2486 Do not dev_put!
1da177e4
LT		 2487 */
2488 if (how == 1) {
1da177e4 2489 idev->dead = 1;
8814c4b5
YH		 2490
2491 /* protected by rtnl_lock */
2492 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2493
2494 /* Step 1.5: remove snmp6 entry */
2495 snmp6_unregister_dev(idev);
2496
2497 }
2498
2499 /* Step 2: clear hash table */
2500 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2501 bifa = &inet6_addr_lst[i];
2502
2503 write_lock_bh(&addrconf_hash_lock);
2504 while ((ifa = *bifa) != NULL) {
2505 if (ifa->idev == idev) {
2506 *bifa = ifa->lst_next;
2507 ifa->lst_next = NULL;
2508 addrconf_del_timer(ifa);
2509 in6_ifa_put(ifa);
2510 continue;
2511 }
2512 bifa = &ifa->lst_next;
2513 }
2514 write_unlock_bh(&addrconf_hash_lock);
2515 }
2516
2517 write_lock_bh(&idev->lock);
2518
2519 /* Step 3: clear flags for stateless addrconf */
2520 if (how != 1)
3c21edbd 2521 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2522
2523 /* Step 4: clear address list */
2524#ifdef CONFIG_IPV6_PRIVACY
2525 if (how == 1 && del_timer(&idev->regen_timer))
2526 in6_dev_put(idev);
2527
2528 /* clear tempaddr list */
2529 while ((ifa = idev->tempaddr_list) != NULL) {
2530 idev->tempaddr_list = ifa->tmp_next;
2531 ifa->tmp_next = NULL;
2532 ifa->dead = 1;
2533 write_unlock_bh(&idev->lock);
2534 spin_lock_bh(&ifa->lock);
2535
2536 if (ifa->ifpub) {
2537 in6_ifa_put(ifa->ifpub);
2538 ifa->ifpub = NULL;
2539 }
2540 spin_unlock_bh(&ifa->lock);
2541 in6_ifa_put(ifa);
2542 write_lock_bh(&idev->lock);
2543 }
2544#endif
2545 while ((ifa = idev->addr_list) != NULL) {
2546 idev->addr_list = ifa->if_next;
2547 ifa->if_next = NULL;
2548 ifa->dead = 1;
2549 addrconf_del_timer(ifa);
2550 write_unlock_bh(&idev->lock);
2551
2552 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2553 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2554 in6_ifa_put(ifa);
2555
2556 write_lock_bh(&idev->lock);
2557 }
2558 write_unlock_bh(&idev->lock);
2559
2560 /* Step 5: Discard multicast list */
2561
2562 if (how == 1)
2563 ipv6_mc_destroy_dev(idev);
2564 else
2565 ipv6_mc_down(idev);
2566
1da177e4 2567 idev->tstamp = jiffies;
1ab1457c 2568
1da177e4
LT		 2569 /* Shot the device (if unregistered) */
2570
2571 if (how == 1) {
408c4768 2572 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2573 neigh_parms_release(&nd_tbl, idev->nd_parms);
2574 neigh_ifdown(&nd_tbl, dev);
2575 in6_dev_put(idev);
2576 }
2577 return 0;
2578}
2579
2580static void addrconf_rs_timer(unsigned long data)
2581{
2582 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2583
2584 if (ifp->idev->cnf.forwarding)
2585 goto out;
2586
2587 if (ifp->idev->if_flags & IF_RA_RCVD) {
2588 /*
2589 * Announcement received after solicitation
2590 * was sent
2591 */
2592 goto out;
2593 }
2594
2595 spin_lock(&ifp->lock);
2596 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2597 struct in6_addr all_routers;
2598
2599 /* The wait after the last probe can be shorter */
2600 addrconf_mod_timer(ifp, AC_RS,
2601 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2602 ifp->idev->cnf.rtr_solicit_delay :
2603 ifp->idev->cnf.rtr_solicit_interval);
2604 spin_unlock(&ifp->lock);
2605
2606 ipv6_addr_all_routers(&all_routers);
2607
2608 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2609 } else {
2610 spin_unlock(&ifp->lock);
2611 /*
2612 * Note: we do not support deprecated "all on-link"
2613 * assumption any longer.
2614 */
2615 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2616 ifp->idev->dev->name);
2617 }
2618
2619out:
2620 in6_ifa_put(ifp);
2621}
2622
2623/*
2624 * Duplicate Address Detection
2625 */
3c21edbd
YH		 2626static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2627{
2628 unsigned long rand_num;
2629 struct inet6_dev *idev = ifp->idev;
2630
95c385b4
NH		 2631 if (ifp->flags & IFA_F_OPTIMISTIC)
2632 rand_num = 0;
2633 else
2634 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2635
3c21edbd
YH		 2636 ifp->probes = idev->cnf.dad_transmits;
2637 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2638}
2639
e431b8c0 2640static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2641{
2642 struct inet6_dev *idev = ifp->idev;
2643 struct net_device *dev = idev->dev;
1da177e4
LT		 2644
2645 addrconf_join_solict(dev, &ifp->addr);
2646
1da177e4 2647 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2648
2649 read_lock_bh(&idev->lock);
2650 if (ifp->dead)
2651 goto out;
2652 spin_lock_bh(&ifp->lock);
2653
2654 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2655 !(ifp->flags&IFA_F_TENTATIVE) ||
2656 ifp->flags & IFA_F_NODAD) {
95c385b4 2657 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2658 spin_unlock_bh(&ifp->lock);
2659 read_unlock_bh(&idev->lock);
2660
2661 addrconf_dad_completed(ifp);
2662 return;
2663 }
2664
6732bade 2665 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2666 spin_unlock_bh(&ifp->lock);
6732bade 2667 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2668 /*
2669 * If the defice is not ready:
2670 * - keep it tentative if it is a permanent address.
2671 * - otherwise, kill it.
2672 */
2673 in6_ifa_hold(ifp);
2674 addrconf_dad_stop(ifp);
6732bade 2675 return;
3c21edbd 2676 }
95c385b4
NH		 2677
2678 /*
2679 * Optimistic nodes can start receiving
2680 * Frames right away
2681 */
2682 if(ifp->flags & IFA_F_OPTIMISTIC)
2683 ip6_ins_rt(ifp->rt);
2684
6732bade
YH		 2685 addrconf_dad_kick(ifp);
2686 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2687out:
2688 read_unlock_bh(&idev->lock);
2689}
2690
2691static void addrconf_dad_timer(unsigned long data)
2692{
2693 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2694 struct inet6_dev *idev = ifp->idev;
2695 struct in6_addr unspec;
2696 struct in6_addr mcaddr;
2697
2698 read_lock_bh(&idev->lock);
2699 if (idev->dead) {
2700 read_unlock_bh(&idev->lock);
2701 goto out;
2702 }
2703 spin_lock_bh(&ifp->lock);
2704 if (ifp->probes == 0) {
2705 /*
2706 * DAD was successful
2707 */
2708
95c385b4 2709 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2710 spin_unlock_bh(&ifp->lock);
2711 read_unlock_bh(&idev->lock);
2712
2713 addrconf_dad_completed(ifp);
2714
2715 goto out;
2716 }
2717
2718 ifp->probes--;
2719 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2720 spin_unlock_bh(&ifp->lock);
2721 read_unlock_bh(&idev->lock);
2722
2723 /* send a neighbour solicitation for our addr */
2724 memset(&unspec, 0, sizeof(unspec));
2725 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2726 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2727out:
2728 in6_ifa_put(ifp);
2729}
2730
2731static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2732{
2733 struct net_device * dev = ifp->idev->dev;
2734
2735 /*
2736 * Configure the address for reception. Now it is valid.
2737 */
2738
2739 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2740
2741 /* If added prefix is link local and forwarding is off,
2742 start sending router solicitations.
2743 */
2744
2745 if (ifp->idev->cnf.forwarding == 0 &&
2746 ifp->idev->cnf.rtr_solicits > 0 &&
2747 (dev->flags&IFF_LOOPBACK) == 0 &&
2748 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2749 struct in6_addr all_routers;
2750
2751 ipv6_addr_all_routers(&all_routers);
2752
2753 /*
2754 * If a host as already performed a random delay
2755 * [...] as part of DAD [...] there is no need
2756 * to delay again before sending the first RS
2757 */
2758 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2759
2760 spin_lock_bh(&ifp->lock);
2761 ifp->probes = 1;
2762 ifp->idev->if_flags |= IF_RS_SENT;
2763 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2764 spin_unlock_bh(&ifp->lock);
2765 }
2766}
2767
c5e33bdd
YH		 2768static void addrconf_dad_run(struct inet6_dev *idev) {
2769 struct inet6_ifaddr *ifp;
2770
2771 read_lock_bh(&idev->lock);
2772 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2773 spin_lock_bh(&ifp->lock);
2774 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2775 spin_unlock_bh(&ifp->lock);
2776 continue;
2777 }
2778 spin_unlock_bh(&ifp->lock);
2779 addrconf_dad_kick(ifp);
2780 }
2781 read_unlock_bh(&idev->lock);
2782}
2783
1da177e4
LT		 2784#ifdef CONFIG_PROC_FS
2785struct if6_iter_state {
3c40090a 2786 struct seq_net_private p;
1da177e4
LT		 2787 int bucket;
2788};
2789
2790static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2791{
2792 struct inet6_ifaddr *ifa = NULL;
2793 struct if6_iter_state *state = seq->private;
1218854a 2794 struct net *net = seq_file_net(seq);
1da177e4
LT		 2795
2796 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2797 ifa = inet6_addr_lst[state->bucket];
3c40090a 2798
878628fb 2799 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2800 ifa = ifa->lst_next;
1da177e4
LT		 2801 if (ifa)
2802 break;
2803 }
2804 return ifa;
2805}
2806
2807static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2808{
2809 struct if6_iter_state *state = seq->private;
1218854a 2810 struct net *net = seq_file_net(seq);
1da177e4
LT		 2811
2812 ifa = ifa->lst_next;
2813try_again:
3c40090a 2814 if (ifa) {
878628fb 2815 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2816 ifa = ifa->lst_next;
2817 goto try_again;
2818 }
2819 }
2820
1da177e4
LT		 2821 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2822 ifa = inet6_addr_lst[state->bucket];
2823 goto try_again;
2824 }
3c40090a 2825
1da177e4
LT		 2826 return ifa;
2827}
2828
2829static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2830{
2831 struct inet6_ifaddr *ifa = if6_get_first(seq);
2832
2833 if (ifa)
2834 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2835 --pos;
2836 return pos ? NULL : ifa;
2837}
2838
2839static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2840 __acquires(addrconf_hash_lock)
1da177e4
LT		 2841{
2842 read_lock_bh(&addrconf_hash_lock);
2843 return if6_get_idx(seq, *pos);
2844}
2845
2846static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2847{
2848 struct inet6_ifaddr *ifa;
2849
2850 ifa = if6_get_next(seq, v);
2851 ++*pos;
2852 return ifa;
2853}
2854
2855static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2856 __releases(addrconf_hash_lock)
1da177e4
LT		 2857{
2858 read_unlock_bh(&addrconf_hash_lock);
2859}
2860
2861static int if6_seq_show(struct seq_file *seq, void *v)
2862{
2863 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2864 seq_printf(seq,
9343e79a 2865 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2866 NIP6(ifp->addr),
2867 ifp->idev->dev->ifindex,
2868 ifp->prefix_len,
2869 ifp->scope,
2870 ifp->flags,
2871 ifp->idev->dev->name);
2872 return 0;
2873}
2874
56b3d975 2875static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2876 .start = if6_seq_start,
2877 .next = if6_seq_next,
2878 .show = if6_seq_show,
2879 .stop = if6_seq_stop,
2880};
2881
2882static int if6_seq_open(struct inode *inode, struct file *file)
2883{
3c40090a
DL		 2884 return seq_open_net(inode, file, &if6_seq_ops,
2885 sizeof(struct if6_iter_state));
1da177e4
LT		 2886}
2887
9a32144e 2888static const struct file_operations if6_fops = {
1da177e4
LT		 2889 .owner = THIS_MODULE,
2890 .open = if6_seq_open,
2891 .read = seq_read,
2892 .llseek = seq_lseek,
3c40090a 2893 .release = seq_release_net,
1da177e4
LT		 2894};
2895
3c40090a 2896static int if6_proc_net_init(struct net *net)
1da177e4 2897{
3c40090a 2898 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2899 return -ENOMEM;
2900 return 0;
2901}
2902
3c40090a
DL		 2903static void if6_proc_net_exit(struct net *net)
2904{
2905 proc_net_remove(net, "if_inet6");
2906}
2907
2908static struct pernet_operations if6_proc_net_ops = {
2909 .init = if6_proc_net_init,
2910 .exit = if6_proc_net_exit,
2911};
2912
2913int __init if6_proc_init(void)
2914{
2915 return register_pernet_subsys(&if6_proc_net_ops);
2916}
2917
1da177e4
LT		 2918void if6_proc_exit(void)
2919{
3c40090a 2920 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2921}
2922#endif /* CONFIG_PROC_FS */
2923
59fbb3a6 2924#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2925/* Check if address is a home address configured on any interface. */
389f6612 2926int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2927{
2928 int ret = 0;
2929 struct inet6_ifaddr * ifp;
2930 u8 hash = ipv6_addr_hash(addr);
2931 read_lock_bh(&addrconf_hash_lock);
2932 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 2933 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 2934 continue;
3b9f9a1c
NT		 2935 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2936 (ifp->flags & IFA_F_HOMEADDRESS)) {
2937 ret = 1;
2938 break;
2939 }
2940 }
2941 read_unlock_bh(&addrconf_hash_lock);
2942 return ret;
2943}
2944#endif
2945
1da177e4
LT		 2946/*
2947 * Periodic address status verification
2948 */
2949
2950static void addrconf_verify(unsigned long foo)
2951{
2952 struct inet6_ifaddr *ifp;
2953 unsigned long now, next;
2954 int i;
2955
2956 spin_lock_bh(&addrconf_verify_lock);
2957 now = jiffies;
2958 next = now + ADDR_CHECK_FREQUENCY;
2959
2960 del_timer(&addr_chk_timer);
2961
2962 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2963
2964restart:
5d5780df 2965 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2966 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2967 unsigned long age;
2968#ifdef CONFIG_IPV6_PRIVACY
2969 unsigned long regen_advance;
2970#endif
2971
2972 if (ifp->flags & IFA_F_PERMANENT)
2973 continue;
2974
2975 spin_lock(&ifp->lock);
2976 age = (now - ifp->tstamp) / HZ;
2977
2978#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2979 regen_advance = ifp->idev->cnf.regen_max_retry *
2980 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2981 ifp->idev->nd_parms->retrans_time / HZ;
2982#endif
2983
8f27ebb9
YH		 2984 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2985 age >= ifp->valid_lft) {
1da177e4
LT		 2986 spin_unlock(&ifp->lock);
2987 in6_ifa_hold(ifp);
5d5780df 2988 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2989 ipv6_del_addr(ifp);
2990 goto restart;
8f27ebb9
YH		 2991 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2992 spin_unlock(&ifp->lock);
2993 continue;
1da177e4
LT		 2994 } else if (age >= ifp->prefered_lft) {
2995 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2996 int deprecate = 0;
2997
2998 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2999 deprecate = 1;
3000 ifp->flags |= IFA_F_DEPRECATED;
3001 }
3002
3003 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3004 next = ifp->tstamp + ifp->valid_lft * HZ;
3005
3006 spin_unlock(&ifp->lock);
3007
3008 if (deprecate) {
3009 in6_ifa_hold(ifp);
5d5780df 3010 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3011
3012 ipv6_ifa_notify(0, ifp);
3013 in6_ifa_put(ifp);
3014 goto restart;
3015 }
3016#ifdef CONFIG_IPV6_PRIVACY
3017 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3018 !(ifp->flags&IFA_F_TENTATIVE)) {
3019 if (age >= ifp->prefered_lft - regen_advance) {
3020 struct inet6_ifaddr *ifpub = ifp->ifpub;
3021 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3022 next = ifp->tstamp + ifp->prefered_lft * HZ;
3023 if (!ifp->regen_count && ifpub) {
3024 ifp->regen_count++;
3025 in6_ifa_hold(ifp);
3026 in6_ifa_hold(ifpub);
3027 spin_unlock(&ifp->lock);
5d5780df 3028 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3029 spin_lock(&ifpub->lock);
3030 ifpub->regen_count = 0;
3031 spin_unlock(&ifpub->lock);
1da177e4
LT		 3032 ipv6_create_tempaddr(ifpub, ifp);
3033 in6_ifa_put(ifpub);
3034 in6_ifa_put(ifp);
3035 goto restart;
3036 }
3037 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3038 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3039 spin_unlock(&ifp->lock);
3040#endif
3041 } else {
3042 /* ifp->prefered_lft <= ifp->valid_lft */
3043 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3044 next = ifp->tstamp + ifp->prefered_lft * HZ;
3045 spin_unlock(&ifp->lock);
3046 }
3047 }
5d5780df 3048 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3049 }
3050
3051 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3052 add_timer(&addr_chk_timer);
3053 spin_unlock_bh(&addrconf_verify_lock);
3054}
3055
461d8837
TG		 3056static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3057{
3058 struct in6_addr *pfx = NULL;
3059
3060 if (addr)
3061 pfx = nla_data(addr);
3062
3063 if (local) {
3064 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3065 pfx = NULL;
3066 else
3067 pfx = nla_data(local);
3068 }
3069
3070 return pfx;
3071}
3072
ef7c79ed 3073static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3074 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3075 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3076 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3077};
3078
1da177e4
LT		 3079static int
3080inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3081{
3b1e0a65 3082 struct net *net = sock_net(skb->sk);
b933f716
TG		 3083 struct ifaddrmsg *ifm;
3084 struct nlattr *tb[IFA_MAX+1];
1da177e4 3085 struct in6_addr *pfx;
b933f716 3086 int err;
1da177e4 3087
b933f716
TG		 3088 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3089 if (err < 0)
3090 return err;
3091
3092 ifm = nlmsg_data(nlh);
3093 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3094 if (pfx == NULL)
3095 return -EINVAL;
3096
af284937 3097 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3098}
3099
55ebaef1
NT		 3100static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3101 u32 prefered_lft, u32 valid_lft)
081bba5b 3102{
46d48046
YH		 3103 u32 flags = RTF_EXPIRES;
3104
081bba5b
NT		 3105 if (!valid_lft || (prefered_lft > valid_lft))
3106 return -EINVAL;
3107
46d48046 3108 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3109 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3110 flags = 0;
3111 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3112 valid_lft = 0x7FFFFFFF/HZ;
3113
3114 if (prefered_lft == 0)
55ebaef1 3115 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3116 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3117 (prefered_lft != INFINITY_LIFE_TIME))
3118 prefered_lft = 0x7FFFFFFF/HZ;
3119
3120 spin_lock_bh(&ifp->lock);
3b9f9a1c 3121 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3122 ifp->tstamp = jiffies;
3123 ifp->valid_lft = valid_lft;
3124 ifp->prefered_lft = prefered_lft;
3125
3126 spin_unlock_bh(&ifp->lock);
3127 if (!(ifp->flags&IFA_F_TENTATIVE))
3128 ipv6_ifa_notify(0, ifp);
081bba5b 3129
46d48046
YH		 3130 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3131 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3132 addrconf_verify(0);
3133
3134 return 0;
3135}
3136
1da177e4
LT		 3137static int
3138inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3139{
3b1e0a65 3140 struct net *net = sock_net(skb->sk);
461d8837
TG		 3141 struct ifaddrmsg *ifm;
3142 struct nlattr *tb[IFA_MAX+1];
1da177e4 3143 struct in6_addr *pfx;
7198f8ce
TG		 3144 struct inet6_ifaddr *ifa;
3145 struct net_device *dev;
55ebaef1
NT		 3146 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3147 u8 ifa_flags;
461d8837 3148 int err;
1da177e4 3149
461d8837
TG		 3150 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3151 if (err < 0)
3152 return err;
3153
3154 ifm = nlmsg_data(nlh);
3155 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3156 if (pfx == NULL)
3157 return -EINVAL;
3158
461d8837 3159 if (tb[IFA_CACHEINFO]) {
0778769d 3160 struct ifa_cacheinfo *ci;
461d8837
TG		 3161
3162 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3163 valid_lft = ci->ifa_valid;
461d8837
TG		 3164 preferred_lft = ci->ifa_prefered;
3165 } else {
3166 preferred_lft = INFINITY_LIFE_TIME;
3167 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3168 }
3169
af284937 3170 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3171 if (dev == NULL)
3172 return -ENODEV;
3173
55ebaef1 3174 /* We ignore other flags so far. */
3b9f9a1c 3175 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3176
1cab3da6 3177 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3178 if (ifa == NULL) {
3179 /*
3180 * It would be best to check for !NLM_F_CREATE here but
3181 * userspace alreay relies on not having to provide this.
3182 */
af284937
DL		 3183 return inet6_addr_add(net, ifm->ifa_index, pfx,
3184 ifm->ifa_prefixlen, ifa_flags,
3185 preferred_lft, valid_lft);
081bba5b
NT		 3186 }
3187
7198f8ce
TG		 3188 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3189 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3190 err = -EEXIST;
3191 else
55ebaef1 3192 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3193
3194 in6_ifa_put(ifa);
3195
3196 return err;
1da177e4
LT		 3197}
3198
101bb229
TG		 3199static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3200 u8 scope, int ifindex)
3201{
3202 struct ifaddrmsg *ifm;
3203
3204 ifm = nlmsg_data(nlh);
3205 ifm->ifa_family = AF_INET6;
3206 ifm->ifa_prefixlen = prefixlen;
3207 ifm->ifa_flags = flags;
3208 ifm->ifa_scope = scope;
3209 ifm->ifa_index = ifindex;
3210}
3211
85486af0
TG		 3212static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3213 unsigned long tstamp, u32 preferred, u32 valid)
3214{
3215 struct ifa_cacheinfo ci;
3216
3217 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3218 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3219 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3220 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3221 ci.ifa_prefered = preferred;
3222 ci.ifa_valid = valid;
3223
3224 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3225}
3226
101bb229
TG		 3227static inline int rt_scope(int ifa_scope)
3228{
3229 if (ifa_scope & IFA_HOST)
3230 return RT_SCOPE_HOST;
3231 else if (ifa_scope & IFA_LINK)
3232 return RT_SCOPE_LINK;
3233 else if (ifa_scope & IFA_SITE)
3234 return RT_SCOPE_SITE;
3235 else
3236 return RT_SCOPE_UNIVERSE;
3237}
3238
0ab6803b
TG		 3239static inline int inet6_ifaddr_msgsize(void)
3240{
339bf98f
TG		 3241 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3242 + nla_total_size(16) /* IFA_ADDRESS */
3243 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3244}
c5396a31 3245
1da177e4 3246static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3247 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3248{
1da177e4 3249 struct nlmsghdr *nlh;
85486af0 3250 u32 preferred, valid;
1da177e4 3251
0ab6803b
TG		 3252 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3253 if (nlh == NULL)
26932566 3254 return -EMSGSIZE;
0ab6803b 3255
101bb229
TG		 3256 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3257 ifa->idev->dev->ifindex);
3258
1da177e4 3259 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3260 preferred = ifa->prefered_lft;
3261 valid = ifa->valid_lft;
3262 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3263 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3264 preferred -= tval;
3265 if (valid != INFINITY_LIFE_TIME)
3266 valid -= tval;
1da177e4
LT		 3267 }
3268 } else {
85486af0
TG		 3269 preferred = INFINITY_LIFE_TIME;
3270 valid = INFINITY_LIFE_TIME;
3271 }
3272
0ab6803b 3273 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3274 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3275 nlmsg_cancel(skb, nlh);
3276 return -EMSGSIZE;
3277 }
1da177e4 3278
0ab6803b 3279 return nlmsg_end(skb, nlh);
1da177e4
LT		 3280}
3281
3282static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3283 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3284{
1da177e4 3285 struct nlmsghdr *nlh;
101bb229
TG		 3286 u8 scope = RT_SCOPE_UNIVERSE;
3287 int ifindex = ifmca->idev->dev->ifindex;
3288
3289 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3290 scope = RT_SCOPE_SITE;
1da177e4 3291
0ab6803b
TG		 3292 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3293 if (nlh == NULL)
26932566 3294 return -EMSGSIZE;
85486af0 3295
0ab6803b
TG		 3296 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3297 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3298 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3299 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3300 nlmsg_cancel(skb, nlh);
3301 return -EMSGSIZE;
3302 }
85486af0 3303
0ab6803b 3304 return nlmsg_end(skb, nlh);
1da177e4
LT		 3305}
3306
3307static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3308 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3309{
1da177e4 3310 struct nlmsghdr *nlh;
101bb229
TG		 3311 u8 scope = RT_SCOPE_UNIVERSE;
3312 int ifindex = ifaca->aca_idev->dev->ifindex;
3313
3314 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3315 scope = RT_SCOPE_SITE;
1da177e4 3316
0ab6803b
TG		 3317 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3318 if (nlh == NULL)
26932566 3319 return -EMSGSIZE;
85486af0 3320
0ab6803b
TG		 3321 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3322 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3323 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3324 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3325 nlmsg_cancel(skb, nlh);
3326 return -EMSGSIZE;
3327 }
1da177e4 3328
0ab6803b 3329 return nlmsg_end(skb, nlh);
1da177e4
LT		 3330}
3331
3332enum addr_type_t
3333{
3334 UNICAST_ADDR,
3335 MULTICAST_ADDR,
3336 ANYCAST_ADDR,
3337};
3338
3339static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3340 enum addr_type_t type)
3341{
3342 int idx, ip_idx;
3343 int s_idx, s_ip_idx;
3344 int err = 1;
3345 struct net_device *dev;
3346 struct inet6_dev *idev = NULL;
3347 struct inet6_ifaddr *ifa;
3348 struct ifmcaddr6 *ifmca;
3349 struct ifacaddr6 *ifaca;
3b1e0a65 3350 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3351
3352 s_idx = cb->args[0];
3353 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3354
7562f876 3355 idx = 0;
6fda7350 3356 for_each_netdev(net, dev) {
1da177e4 3357 if (idx < s_idx)
7562f876 3358 goto cont;
1da177e4
LT		 3359 if (idx > s_idx)
3360 s_ip_idx = 0;
3361 ip_idx = 0;
3362 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3363 goto cont;
1da177e4
LT		 3364 read_lock_bh(&idev->lock);
3365 switch (type) {
3366 case UNICAST_ADDR:
ae9cda5d 3367 /* unicast address incl. temp addr */
1da177e4
LT		 3368 for (ifa = idev->addr_list; ifa;
3369 ifa = ifa->if_next, ip_idx++) {
3370 if (ip_idx < s_ip_idx)
3371 continue;
5d5619b4
YH		 3372 err = inet6_fill_ifaddr(skb, ifa,
3373 NETLINK_CB(cb->skb).pid,
3374 cb->nlh->nlmsg_seq,
3375 RTM_NEWADDR,
3376 NLM_F_MULTI);
1da177e4 3377 }
1da177e4
LT		 3378 break;
3379 case MULTICAST_ADDR:
3380 /* multicast address */
1ab1457c 3381 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3382 ifmca = ifmca->next, ip_idx++) {
3383 if (ip_idx < s_ip_idx)
3384 continue;
5d5619b4
YH		 3385 err = inet6_fill_ifmcaddr(skb, ifmca,
3386 NETLINK_CB(cb->skb).pid,
3387 cb->nlh->nlmsg_seq,
3388 RTM_GETMULTICAST,
3389 NLM_F_MULTI);
1da177e4
LT		 3390 }
3391 break;
3392 case ANYCAST_ADDR:
3393 /* anycast address */
3394 for (ifaca = idev->ac_list; ifaca;
3395 ifaca = ifaca->aca_next, ip_idx++) {
3396 if (ip_idx < s_ip_idx)
3397 continue;
5d5619b4
YH		 3398 err = inet6_fill_ifacaddr(skb, ifaca,
3399 NETLINK_CB(cb->skb).pid,
3400 cb->nlh->nlmsg_seq,
3401 RTM_GETANYCAST,
3402 NLM_F_MULTI);
1da177e4
LT		 3403 }
3404 break;
3405 default:
3406 break;
3407 }
3408 read_unlock_bh(&idev->lock);
3409 in6_dev_put(idev);
5d5619b4
YH		 3410
3411 if (err <= 0)
3412 break;
7562f876
PE		 3413cont:
3414 idx++;
1da177e4 3415 }
1da177e4
LT		 3416 cb->args[0] = idx;
3417 cb->args[1] = ip_idx;
3418 return skb->len;
3419}
3420
3421static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3422{
3423 enum addr_type_t type = UNICAST_ADDR;
b854272b 3424
1da177e4
LT		 3425 return inet6_dump_addr(skb, cb, type);
3426}
3427
3428static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3429{
3430 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3431
1da177e4
LT		 3432 return inet6_dump_addr(skb, cb, type);
3433}
3434
3435
3436static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3437{
3438 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3439
1da177e4
LT		 3440 return inet6_dump_addr(skb, cb, type);
3441}
3442
1b29fc2c
TG		 3443static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3444 void *arg)
6c223828 3445{
3b1e0a65 3446 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3447 struct ifaddrmsg *ifm;
3448 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3449 struct in6_addr *addr = NULL;
3450 struct net_device *dev = NULL;
3451 struct inet6_ifaddr *ifa;
3452 struct sk_buff *skb;
6c223828
NT		 3453 int err;
3454
1b29fc2c
TG		 3455 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3456 if (err < 0)
3457 goto errout;
3458
3459 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3460 if (addr == NULL) {
3461 err = -EINVAL;
3462 goto errout;
6c223828 3463 }
6c223828 3464
1b29fc2c 3465 ifm = nlmsg_data(nlh);
6c223828 3466 if (ifm->ifa_index)
6fda7350 3467 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3468
1cab3da6 3469 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3470 err = -EADDRNOTAVAIL;
3471 goto errout;
3472 }
6c223828 3473
0ab6803b 3474 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3475 err = -ENOBUFS;
1b29fc2c 3476 goto errout_ifa;
6c223828
NT		 3477 }
3478
6c223828
NT		 3479 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3480 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3481 if (err < 0) {
3482 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3483 WARN_ON(err == -EMSGSIZE);
3484 kfree_skb(skb);
3485 goto errout_ifa;
3486 }
6fda7350 3487 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3488errout_ifa:
6c223828 3489 in6_ifa_put(ifa);
1b29fc2c 3490errout:
6c223828 3491 return err;
6c223828
NT		 3492}
3493
1da177e4
LT		 3494static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3495{
3496 struct sk_buff *skb;
c346dca1 3497 struct net *net = dev_net(ifa->idev->dev);
5d620266 3498 int err = -ENOBUFS;
1da177e4 3499
0ab6803b 3500 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3501 if (skb == NULL)
3502 goto errout;
3503
3504 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3505 if (err < 0) {
3506 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3507 WARN_ON(err == -EMSGSIZE);
3508 kfree_skb(skb);
3509 goto errout;
3510 }
6fda7350 3511 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3512errout:
3513 if (err < 0)
6fda7350 3514 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3515}
3516
b6f99a21 3517static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3518 __s32 *array, int bytes)
3519{
04561c1f
TG		 3520 BUG_ON(bytes < (DEVCONF_MAX * 4));
3521
1da177e4
LT		 3522 memset(array, 0, bytes);
3523 array[DEVCONF_FORWARDING] = cnf->forwarding;
3524 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3525 array[DEVCONF_MTU6] = cnf->mtu6;
3526 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3527 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3528 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3529 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3530 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3531 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3532 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3533 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3534#ifdef CONFIG_IPV6_PRIVACY
3535 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3536 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3537 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3538 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3539 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3540#endif
3541 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3542 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3543 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3544#ifdef CONFIG_IPV6_ROUTER_PREF
3545 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3546 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3547#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3548 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3549#endif
930d6ff2 3550#endif
fbea49e1 3551 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3552 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3553#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3554 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3555#endif
1da177e4
LT		 3556}
3557
339bf98f
TG		 3558static inline size_t inet6_if_nlmsg_size(void)
3559{
3560 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3561 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3562 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3563 + nla_total_size(4) /* IFLA_MTU */
3564 + nla_total_size(4) /* IFLA_LINK */
3565 + nla_total_size( /* IFLA_PROTINFO */
3566 nla_total_size(4) /* IFLA_INET6_FLAGS */
3567 + nla_total_size(sizeof(struct ifla_cacheinfo))
3568 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3569 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3570 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3571 );
3572}
c5396a31 3573
7f7d9a6b
HX		 3574static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3575 int bytes)
3576{
3577 int i;
3578 int pad = bytes - sizeof(u64) * items;
3579 BUG_ON(pad < 0);
3580
3581 /* Use put_unaligned() because stats may not be aligned for u64. */
3582 put_unaligned(items, &stats[0]);
3583 for (i = 1; i < items; i++)
3584 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3585
3586 memset(&stats[items], 0, pad);
3587}
3588
3589static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3590 int bytes)
3591{
3592 switch(attrtype) {
3593 case IFLA_INET6_STATS:
3594 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3595 break;
3596 case IFLA_INET6_ICMP6STATS:
3597 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3598 break;
3599 }
3600}
3601
1ab1457c 3602static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3603 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3604{
04561c1f 3605 struct net_device *dev = idev->dev;
bf99f1bd 3606 struct nlattr *nla;
04561c1f
TG		 3607 struct ifinfomsg *hdr;
3608 struct nlmsghdr *nlh;
3609 void *protoinfo;
3610 struct ifla_cacheinfo ci;
3611
3612 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3613 if (nlh == NULL)
26932566 3614 return -EMSGSIZE;
04561c1f
TG		 3615
3616 hdr = nlmsg_data(nlh);
3617 hdr->ifi_family = AF_INET6;
3618 hdr->__ifi_pad = 0;
3619 hdr->ifi_type = dev->type;
3620 hdr->ifi_index = dev->ifindex;
3621 hdr->ifi_flags = dev_get_flags(dev);
3622 hdr->ifi_change = 0;
3623
3624 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3625
3626 if (dev->addr_len)
04561c1f 3627 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3628
04561c1f 3629 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3630 if (dev->ifindex != dev->iflink)
04561c1f 3631 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3632
04561c1f
TG		 3633 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3634 if (protoinfo == NULL)
3635 goto nla_put_failure;
1da177e4 3636
04561c1f 3637 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3638
1da177e4
LT		 3639 ci.max_reasm_len = IPV6_MAXPLEN;
3640 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3641 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3642 ci.reachable_time = idev->nd_parms->reachable_time;
3643 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3644 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3645
bf99f1bd
YH		 3646 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3647 if (nla == NULL)
04561c1f 3648 goto nla_put_failure;
bf99f1bd 3649 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3650
bf99f1bd
YH		 3651 /* XXX - MC not implemented */
3652
3653 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3654 if (nla == NULL)
3655 goto nla_put_failure;
3656 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3657
3658 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3659 if (nla == NULL)
3660 goto nla_put_failure;
3661 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3662
04561c1f
TG		 3663 nla_nest_end(skb, protoinfo);
3664 return nlmsg_end(skb, nlh);
1da177e4 3665
04561c1f 3666nla_put_failure:
26932566
PM		 3667 nlmsg_cancel(skb, nlh);
3668 return -EMSGSIZE;
1da177e4
LT		 3669}
3670
3671static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3672{
3b1e0a65 3673 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3674 int idx, err;
3675 int s_idx = cb->args[0];
3676 struct net_device *dev;
3677 struct inet6_dev *idev;
3678
3679 read_lock(&dev_base_lock);
7562f876 3680 idx = 0;
6fda7350 3681 for_each_netdev(net, dev) {
1da177e4 3682 if (idx < s_idx)
7562f876 3683 goto cont;
1da177e4 3684 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3685 goto cont;
1ab1457c 3686 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3687 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3688 in6_dev_put(idev);
3689 if (err <= 0)
3690 break;
7562f876
PE		 3691cont:
3692 idx++;
1da177e4
LT		 3693 }
3694 read_unlock(&dev_base_lock);
3695 cb->args[0] = idx;
3696
3697 return skb->len;
3698}
3699
3700void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3701{
3702 struct sk_buff *skb;
c346dca1 3703 struct net *net = dev_net(idev->dev);
8d7a76c9 3704 int err = -ENOBUFS;
1ab1457c 3705
339bf98f 3706 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3707 if (skb == NULL)
3708 goto errout;
3709
3710 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3711 if (err < 0) {
3712 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3713 WARN_ON(err == -EMSGSIZE);
3714 kfree_skb(skb);
3715 goto errout;
3716 }
6fda7350 3717 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3718errout:
3719 if (err < 0)
6fda7350 3720 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3721}
3722
339bf98f
TG		 3723static inline size_t inet6_prefix_nlmsg_size(void)
3724{
3725 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3726 + nla_total_size(sizeof(struct in6_addr))
3727 + nla_total_size(sizeof(struct prefix_cacheinfo));
3728}
c5396a31 3729
1da177e4 3730static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3731 struct prefix_info *pinfo, u32 pid, u32 seq,
3732 int event, unsigned int flags)
1da177e4 3733{
6051e2f4
TG		 3734 struct prefixmsg *pmsg;
3735 struct nlmsghdr *nlh;
1da177e4
LT		 3736 struct prefix_cacheinfo ci;
3737
6051e2f4
TG		 3738 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3739 if (nlh == NULL)
26932566 3740 return -EMSGSIZE;
6051e2f4
TG		 3741
3742 pmsg = nlmsg_data(nlh);
1da177e4 3743 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3744 pmsg->prefix_pad1 = 0;
3745 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3746 pmsg->prefix_ifindex = idev->dev->ifindex;
3747 pmsg->prefix_len = pinfo->prefix_len;
3748 pmsg->prefix_type = pinfo->type;
8a47077a 3749 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3750 pmsg->prefix_flags = 0;
3751 if (pinfo->onlink)
3752 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3753 if (pinfo->autoconf)
3754 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3755
6051e2f4 3756 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3757
3758 ci.preferred_time = ntohl(pinfo->prefered);
3759 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3760 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3761
6051e2f4 3762 return nlmsg_end(skb, nlh);
1da177e4 3763
6051e2f4 3764nla_put_failure:
26932566
PM		 3765 nlmsg_cancel(skb, nlh);
3766 return -EMSGSIZE;
1da177e4
LT		 3767}
3768
1ab1457c 3769static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3770 struct prefix_info *pinfo)
3771{
3772 struct sk_buff *skb;
c346dca1 3773 struct net *net = dev_net(idev->dev);
8c384bfa 3774 int err = -ENOBUFS;
1da177e4 3775
339bf98f 3776 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3777 if (skb == NULL)
3778 goto errout;
3779
3780 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3781 if (err < 0) {
3782 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3783 WARN_ON(err == -EMSGSIZE);
3784 kfree_skb(skb);
3785 goto errout;
3786 }
6fda7350 3787 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3788errout:
3789 if (err < 0)
6fda7350 3790 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3791}
3792
1da177e4
LT		 3793static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3794{
3795 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3796
3797 switch (event) {
3798 case RTM_NEWADDR:
95c385b4
NH		 3799 /*
3800 * If the address was optimistic
3801 * we inserted the route at the start of
3802 * our DAD process, so we don't need
3803 * to do it again
3804 */
3805 if (!(ifp->rt->rt6i_node))
3806 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3807 if (ifp->idev->cnf.forwarding)
3808 addrconf_join_anycast(ifp);
3809 break;
3810 case RTM_DELADDR:
3811 if (ifp->idev->cnf.forwarding)
3812 addrconf_leave_anycast(ifp);
3813 addrconf_leave_solict(ifp->idev, &ifp->addr);
3814 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3815 if (ip6_del_rt(ifp->rt))
1da177e4 3816 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3817 break;
3818 }
3819}
3820
3821static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3822{
8814c4b5 3823 rcu_read_lock_bh();
1da177e4
LT		 3824 if (likely(ifp->idev->dead == 0))
3825 __ipv6_ifa_notify(event, ifp);
8814c4b5 3826 rcu_read_unlock_bh();
1da177e4
LT		 3827}
3828
3829#ifdef CONFIG_SYSCTL
3830
3831static
3832int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3833 void __user *buffer, size_t *lenp, loff_t *ppos)
3834{
3835 int *valp = ctl->data;
3836 int val = *valp;
3837 int ret;
3838
3839 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3840
c8fecf22
PE		 3841 if (write)
3842 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3843 return ret;
1da177e4
LT		 3844}
3845
1ab1457c 3846static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3847 int __user *name, int nlen,
3848 void __user *oldval,
3849 size_t __user *oldlenp,
1f29bcd7 3850 void __user *newval, size_t newlen)
1da177e4
LT		 3851{
3852 int *valp = table->data;
c8fecf22 3853 int val = *valp;
1da177e4
LT		 3854 int new;
3855
3856 if (!newval || !newlen)
3857 return 0;
3858 if (newlen != sizeof(int))
3859 return -EINVAL;
3860 if (get_user(new, (int __user *)newval))
3861 return -EFAULT;
3862 if (new == *valp)
3863 return 0;
3864 if (oldval && oldlenp) {
3865 size_t len;
3866 if (get_user(len, oldlenp))
3867 return -EFAULT;
3868 if (len) {
3869 if (len > table->maxlen)
3870 len = table->maxlen;
3871 if (copy_to_user(oldval, valp, len))
3872 return -EFAULT;
3873 if (put_user(len, oldlenp))
3874 return -EFAULT;
3875 }
3876 }
3877
c8fecf22
PE		 3878 *valp = new;
3879 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3880 return 1;
3881}
3882
3883static struct addrconf_sysctl_table
3884{
3885 struct ctl_table_header *sysctl_header;
3886 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3887 char *dev_name;
ab32ea5d 3888} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3889 .sysctl_header = NULL,
3890 .addrconf_vars = {
1ab1457c 3891 {
1da177e4
LT		 3892 .ctl_name = NET_IPV6_FORWARDING,
3893 .procname = "forwarding",
1ab1457c 3894 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3895 .maxlen = sizeof(int),
3896 .mode = 0644,
1ab1457c 3897 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3898 .strategy = &addrconf_sysctl_forward_strategy,
3899 },
3900 {
3901 .ctl_name = NET_IPV6_HOP_LIMIT,
3902 .procname = "hop_limit",
1ab1457c 3903 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3904 .maxlen = sizeof(int),
3905 .mode = 0644,
3906 .proc_handler = proc_dointvec,
3907 },
3908 {
3909 .ctl_name = NET_IPV6_MTU,
3910 .procname = "mtu",
3911 .data = &ipv6_devconf.mtu6,
1ab1457c 3912 .maxlen = sizeof(int),
1da177e4 3913 .mode = 0644,
1ab1457c 3914 .proc_handler = &proc_dointvec,
1da177e4
LT		 3915 },
3916 {
3917 .ctl_name = NET_IPV6_ACCEPT_RA,
3918 .procname = "accept_ra",
1ab1457c 3919 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3920 .maxlen = sizeof(int),
3921 .mode = 0644,
1ab1457c 3922 .proc_handler = &proc_dointvec,
1da177e4
LT		 3923 },
3924 {
3925 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3926 .procname = "accept_redirects",
1ab1457c 3927 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3928 .maxlen = sizeof(int),
3929 .mode = 0644,
1ab1457c 3930 .proc_handler = &proc_dointvec,
1da177e4
LT		 3931 },
3932 {
3933 .ctl_name = NET_IPV6_AUTOCONF,
3934 .procname = "autoconf",
1ab1457c 3935 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3936 .maxlen = sizeof(int),
3937 .mode = 0644,
1ab1457c 3938 .proc_handler = &proc_dointvec,
1da177e4
LT		 3939 },
3940 {
3941 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3942 .procname = "dad_transmits",
1ab1457c 3943 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3944 .maxlen = sizeof(int),
3945 .mode = 0644,
1ab1457c 3946 .proc_handler = &proc_dointvec,
1da177e4
LT		 3947 },
3948 {
3949 .ctl_name = NET_IPV6_RTR_SOLICITS,
3950 .procname = "router_solicitations",
1ab1457c 3951 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3952 .maxlen = sizeof(int),
3953 .mode = 0644,
1ab1457c 3954 .proc_handler = &proc_dointvec,
1da177e4
LT		 3955 },
3956 {
3957 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3958 .procname = "router_solicitation_interval",
1ab1457c 3959 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3960 .maxlen = sizeof(int),
3961 .mode = 0644,
1ab1457c 3962 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3963 .strategy = &sysctl_jiffies,
3964 },
3965 {
3966 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3967 .procname = "router_solicitation_delay",
1ab1457c 3968 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3969 .maxlen = sizeof(int),
3970 .mode = 0644,
1ab1457c 3971 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3972 .strategy = &sysctl_jiffies,
3973 },
3974 {
3975 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3976 .procname = "force_mld_version",
1ab1457c 3977 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3978 .maxlen = sizeof(int),
3979 .mode = 0644,
1ab1457c 3980 .proc_handler = &proc_dointvec,
1da177e4
LT		 3981 },
3982#ifdef CONFIG_IPV6_PRIVACY
3983 {
3984 .ctl_name = NET_IPV6_USE_TEMPADDR,
3985 .procname = "use_tempaddr",
1ab1457c 3986 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3987 .maxlen = sizeof(int),
3988 .mode = 0644,
1ab1457c 3989 .proc_handler = &proc_dointvec,
1da177e4
LT		 3990 },
3991 {
3992 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3993 .procname = "temp_valid_lft",
1ab1457c 3994 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3995 .maxlen = sizeof(int),
3996 .mode = 0644,
1ab1457c 3997 .proc_handler = &proc_dointvec,
1da177e4
LT		 3998 },
3999 {
4000 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4001 .procname = "temp_prefered_lft",
1ab1457c 4002 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4003 .maxlen = sizeof(int),
4004 .mode = 0644,
1ab1457c 4005 .proc_handler = &proc_dointvec,
1da177e4
LT		 4006 },
4007 {
4008 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4009 .procname = "regen_max_retry",
1ab1457c 4010 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4011 .maxlen = sizeof(int),
4012 .mode = 0644,
1ab1457c 4013 .proc_handler = &proc_dointvec,
1da177e4
LT		 4014 },
4015 {
4016 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4017 .procname = "max_desync_factor",
1ab1457c 4018 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4019 .maxlen = sizeof(int),
4020 .mode = 0644,
1ab1457c 4021 .proc_handler = &proc_dointvec,
1da177e4
LT		 4022 },
4023#endif
4024 {
4025 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4026 .procname = "max_addresses",
4027 .data = &ipv6_devconf.max_addresses,
4028 .maxlen = sizeof(int),
4029 .mode = 0644,
4030 .proc_handler = &proc_dointvec,
4031 },
65f5c7c1
YH		 4032 {
4033 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4034 .procname = "accept_ra_defrtr",
1ab1457c 4035 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4036 .maxlen = sizeof(int),
4037 .mode = 0644,
1ab1457c 4038 .proc_handler = &proc_dointvec,
65f5c7c1 4039 },
c4fd30eb
YH		 4040 {
4041 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4042 .procname = "accept_ra_pinfo",
1ab1457c 4043 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4044 .maxlen = sizeof(int),
4045 .mode = 0644,
1ab1457c 4046 .proc_handler = &proc_dointvec,
c4fd30eb 4047 },
930d6ff2
YH		 4048#ifdef CONFIG_IPV6_ROUTER_PREF
4049 {
4050 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4051 .procname = "accept_ra_rtr_pref",
4052 .data = &ipv6_devconf.accept_ra_rtr_pref,
4053 .maxlen = sizeof(int),
4054 .mode = 0644,
4055 .proc_handler = &proc_dointvec,
4056 },
52e16356
YH		 4057 {
4058 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4059 .procname = "router_probe_interval",
4060 .data = &ipv6_devconf.rtr_probe_interval,
4061 .maxlen = sizeof(int),
4062 .mode = 0644,
4063 .proc_handler = &proc_dointvec_jiffies,
4064 .strategy = &sysctl_jiffies,
4065 },
fa03ef38 4066#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4067 {
4068 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4069 .procname = "accept_ra_rt_info_max_plen",
4070 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4071 .maxlen = sizeof(int),
4072 .mode = 0644,
4073 .proc_handler = &proc_dointvec,
4074 },
4075#endif
930d6ff2 4076#endif
fbea49e1
YH		 4077 {
4078 .ctl_name = NET_IPV6_PROXY_NDP,
4079 .procname = "proxy_ndp",
4080 .data = &ipv6_devconf.proxy_ndp,
4081 .maxlen = sizeof(int),
4082 .mode = 0644,
4083 .proc_handler = &proc_dointvec,
4084 },
0bcbc926
YH		 4085 {
4086 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4087 .procname = "accept_source_route",
4088 .data = &ipv6_devconf.accept_source_route,
4089 .maxlen = sizeof(int),
4090 .mode = 0644,
4091 .proc_handler = &proc_dointvec,
4092 },
95c385b4
NH		 4093#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4094 {
4095 .ctl_name = CTL_UNNUMBERED,
4096 .procname = "optimistic_dad",
4097 .data = &ipv6_devconf.optimistic_dad,
4098 .maxlen = sizeof(int),
4099 .mode = 0644,
4100 .proc_handler = &proc_dointvec,
4101
4102 },
4103#endif
1da177e4
LT		 4104 {
4105 .ctl_name = 0, /* sentinel */
4106 }
4107 },
1da177e4
LT		 4108};
4109
bff16c2f
PE		 4110static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4111 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4112{
4113 int i;
1da177e4 4114 struct addrconf_sysctl_table *t;
1da177e4 4115
1dab6222
PE		 4116#define ADDRCONF_CTL_PATH_DEV 3
4117
4118 struct ctl_path addrconf_ctl_path[] = {
4119 { .procname = "net", .ctl_name = CTL_NET, },
4120 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4121 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4122 { /* to be set */ },
4123 { },
4124 };
4125
4126
af879cc7 4127 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4128 if (t == NULL)
f68635e6
PE		 4129 goto out;
4130
1da177e4
LT		 4131 for (i=0; t->addrconf_vars[i].data; i++) {
4132 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4133 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4134 t->addrconf_vars[i].extra2 = net;
1da177e4 4135 }
1da177e4 4136
1ab1457c
YH		 4137 /*
4138 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4139 * by sysctl and we wouldn't want anyone to change it under our feet
4140 * (see SIOCSIFNAME).
1ab1457c 4141 */
1dab6222
PE		 4142 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4143 if (!t->dev_name)
f68635e6 4144 goto free;
1da177e4 4145
1dab6222
PE		 4146 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4147 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4148
bff16c2f 4149 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4150 t->addrconf_vars);
1da177e4
LT		 4151 if (t->sysctl_header == NULL)
4152 goto free_procname;
f68635e6
PE		 4153
4154 p->sysctl = t;
95897312 4155 return 0;
1da177e4 4156
f68635e6 4157free_procname:
1dab6222 4158 kfree(t->dev_name);
f68635e6 4159free:
1da177e4 4160 kfree(t);
f68635e6 4161out:
95897312 4162 return -ENOBUFS;
1da177e4
LT		 4163}
4164
408c4768
PE		 4165static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4166{
4167 struct addrconf_sysctl_table *t;
4168
4169 if (p->sysctl == NULL)
4170 return;
4171
4172 t = p->sysctl;
4173 p->sysctl = NULL;
4174 unregister_sysctl_table(t->sysctl_header);
4175 kfree(t->dev_name);
4176 kfree(t);
4177}
4178
f52295a9
PE		 4179static void addrconf_sysctl_register(struct inet6_dev *idev)
4180{
408c4768
PE		 4181 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4182 NET_IPV6_NEIGH, "ipv6",
4183 &ndisc_ifinfo_sysctl_change,
4184 NULL);
c346dca1 4185 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4186 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4187}
4188
408c4768 4189static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4190{
408c4768
PE		 4191 __addrconf_sysctl_unregister(&idev->cnf);
4192 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4193}
4194
4195
4196#endif
4197
e0da5a48
PE		 4198static int addrconf_init_net(struct net *net)
4199{
4200 int err;
4201 struct ipv6_devconf *all, *dflt;
4202
4203 err = -ENOMEM;
4204 all = &ipv6_devconf;
4205 dflt = &ipv6_devconf_dflt;
4206
4207 if (net != &init_net) {
4208 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4209 if (all == NULL)
4210 goto err_alloc_all;
4211
4212 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4213 if (dflt == NULL)
4214 goto err_alloc_dflt;
4215 }
4216
4217 net->ipv6.devconf_all = all;
4218 net->ipv6.devconf_dflt = dflt;
4219
4220#ifdef CONFIG_SYSCTL
4221 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4222 NULL, all);
4223 if (err < 0)
4224 goto err_reg_all;
4225
4226 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4227 NULL, dflt);
4228 if (err < 0)
4229 goto err_reg_dflt;
4230#endif
4231 return 0;
4232
4233#ifdef CONFIG_SYSCTL
4234err_reg_dflt:
4235 __addrconf_sysctl_unregister(all);
4236err_reg_all:
4237 kfree(dflt);
4238#endif
4239err_alloc_dflt:
4240 kfree(all);
4241err_alloc_all:
4242 return err;
4243}
4244
4245static void addrconf_exit_net(struct net *net)
4246{
4247#ifdef CONFIG_SYSCTL
4248 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4249 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4250#endif
4251 if (net != &init_net) {
4252 kfree(net->ipv6.devconf_dflt);
4253 kfree(net->ipv6.devconf_all);
4254 }
4255}
4256
4257static struct pernet_operations addrconf_ops = {
4258 .init = addrconf_init_net,
4259 .exit = addrconf_exit_net,
4260};
4261
1da177e4
LT		 4262/*
4263 * Device notifier
4264 */
4265
4266int register_inet6addr_notifier(struct notifier_block *nb)
4267{
1ab1457c 4268 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4269}
4270
7159039a
YH		 4271EXPORT_SYMBOL(register_inet6addr_notifier);
4272
1da177e4
LT		 4273int unregister_inet6addr_notifier(struct notifier_block *nb)
4274{
1ab1457c 4275 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4276}
4277
7159039a
YH		 4278EXPORT_SYMBOL(unregister_inet6addr_notifier);
4279
af284937
DL		 4280
4281static int addrconf_net_init(struct net *net)
4282{
4283 return 0;
4284}
4285
4286static void addrconf_net_exit(struct net *net)
4287{
6fda7350
BT		 4288 struct net_device *dev;
4289
6fda7350
BT		 4290 rtnl_lock();
4291 /* clean dev list */
4292 for_each_netdev(net, dev) {
4293 if (__in6_dev_get(dev) == NULL)
4294 continue;
4295 addrconf_ifdown(dev, 1);
4296 }
4297 addrconf_ifdown(net->loopback_dev, 2);
4298 rtnl_unlock();
af284937
DL		 4299}
4300
4301static struct pernet_operations addrconf_net_ops = {
4302 .init = addrconf_net_init,
4303 .exit = addrconf_net_exit,
4304};
4305
1da177e4
LT		 4306/*
4307 * Init / cleanup code
4308 */
4309
4310int __init addrconf_init(void)
4311{
2a8cc6c8
YH		 4312 int err;
4313
4314 if ((err = ipv6_addr_label_init()) < 0) {
4315 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4316 err);
4317 return err;
4318 }
1da177e4 4319
e0da5a48
PE		 4320 register_pernet_subsys(&addrconf_ops);
4321
1da177e4
LT		 4322 /* The addrconf netdev notifier requires that loopback_dev
4323 * has it's ipv6 private information allocated and setup
4324 * before it can bring up and give link-local addresses
4325 * to other devices which are up.
4326 *
4327 * Unfortunately, loopback_dev is not necessarily the first
4328 * entry in the global dev_base list of net devices. In fact,
4329 * it is likely to be the very last entry on that list.
4330 * So this causes the notifier registry below to try and
4331 * give link-local addresses to all devices besides loopback_dev
4332 * first, then loopback_dev, which cases all the non-loopback_dev
4333 * devices to fail to get a link-local address.
4334 *
4335 * So, as a temporary fix, allocate the ipv6 structure for
4336 * loopback_dev first by hand.
4337 * Longer term, all of the dependencies ipv6 has upon the loopback
4338 * device and it being up should be removed.
4339 */
4340 rtnl_lock();
2774c7ab 4341 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4342 err = -ENOMEM;
4343 rtnl_unlock();
4344 if (err)
e0da5a48 4345 goto errlo;
1da177e4 4346
af284937
DL		 4347 err = register_pernet_device(&addrconf_net_ops);
4348 if (err)
4349 return err;
4350
1da177e4
LT		 4351 register_netdevice_notifier(&ipv6_dev_notf);
4352
1da177e4 4353 addrconf_verify(0);
c127ea2c
TG		 4354
4355 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4356 if (err < 0)
4357 goto errout;
4358
4359 /* Only the first call to __rtnl_register can fail */
4360 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4361 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4362 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4363 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4364 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4365
2a8cc6c8
YH		 4366 ipv6_addr_label_rtnl_register();
4367
1da177e4 4368 return 0;
c127ea2c
TG		 4369errout:
4370 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4371errlo:
4372 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4373
4374 return err;
1da177e4
LT		 4375}
4376
09f7709f 4377void addrconf_cleanup(void)
1da177e4 4378{
1ab1457c 4379 struct inet6_ifaddr *ifa;
1da177e4
LT		 4380 int i;
4381
4382 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4383 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4384
e0da5a48 4385 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4386
4387 rtnl_lock();
4388
1da177e4
LT		 4389 /*
4390 * Check hash table.
4391 */
1da177e4
LT		 4392 write_lock_bh(&addrconf_hash_lock);
4393 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4394 for (ifa=inet6_addr_lst[i]; ifa; ) {
4395 struct inet6_ifaddr *bifa;
4396
4397 bifa = ifa;
4398 ifa = ifa->lst_next;
4399 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4400 /* Do not free it; something is wrong.
4401 Now we can investigate it with debugger.
4402 */
4403 }
4404 }
4405 write_unlock_bh(&addrconf_hash_lock);
4406
4407 del_timer(&addr_chk_timer);
1da177e4 4408 rtnl_unlock();
af284937
DL		 4409
4410 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4411}
Linux kernel - Deliverables
This page took 0.937101 seconds and 5 git commands to generate.