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[NETNS][IPV6]: inet6_addr - ipv6_get_ifaddr namespace aware
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
ab32ea5d 157struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 188};
189
ab32ea5d 190static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201#ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207#endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 209 .accept_ra_defrtr = 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216#endif
930d6ff2 217#endif
fbea49e1 218 .proxy_ndp = 0,
0bcbc926 219 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 220};
221
222/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 223const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
1da177e4
LT		 232static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233{
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236}
237
238enum addrconf_timer_t
239{
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243};
244
245static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248{
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263}
264
7f7d9a6b
HX		 265static int snmp6_alloc_dev(struct inet6_dev *idev)
266{
7f7d9a6b 267 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 268 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 271 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 272 goto err_icmp;
14878f75 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 274 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 275 goto err_icmpmsg;
7f7d9a6b
HX		 276
277 return 0;
278
14878f75
DS		 279err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 281err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283err_ip:
aaf70ec7 284 return -ENOMEM;
7f7d9a6b
HX		 285}
286
16910b98 287static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 288{
14878f75 289 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 292}
293
1da177e4
LT		 294/* Nobody refers to this device, we may destroy it. */
295
8814c4b5
YH		 296static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297{
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300}
301
1da177e4
LT		 302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
8814c4b5 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 317}
318
7159039a
YH		 319EXPORT_SYMBOL(in6_dev_finish_destroy);
320
1da177e4
LT		 321static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322{
323 struct inet6_dev *ndev;
d88ae4cc 324 struct in6_addr maddr;
1da177e4
LT		 325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
1ab1457c 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 332
1ab1457c
YH		 333 if (ndev == NULL)
334 return NULL;
322f74a4
IO		 335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
441fc2a2 338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
1da177e4 348
322f74a4
IO		 349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __FUNCTION__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
1da177e4 358
322f74a4
IO		 359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __FUNCTION__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
1da177e4
LT		 373
374#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 378#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380#endif
381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
322f74a4
IO		 393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
1da177e4
LT		 397#endif
398
f24e3d65 399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 400 ndev->if_flags |= IF_READY;
401
322f74a4
IO		 402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
f52295a9 404 addrconf_sysctl_register(ndev);
30c4cf57
DS		 405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
1da177e4
LT		 412 return ndev;
413}
414
415static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
1ab1457c 443
1da177e4
LT		 444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
1da177e4
LT		 452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457}
458
459
e186932b 460static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 461{
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
bff16c2f 466 for_each_netdev(net, dev) {
8814c4b5 467 rcu_read_lock();
1da177e4
LT		 468 idev = __in6_dev_get(dev);
469 if (idev) {
e186932b
PE		 470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
1da177e4
LT		 472 if (changed)
473 dev_forward_change(idev);
474 }
8814c4b5 475 rcu_read_unlock();
1da177e4
LT		 476 }
477 read_unlock(&dev_base_lock);
478}
c8fecf22
PE		 479
480static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481{
bff16c2f
PE		 482 struct net *net;
483
484 net = (struct net *)table->extra2;
441fc2a2 485 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 486 return;
487
e186932b
PE		 488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
c8fecf22
PE		 492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
496 rt6_purge_dflt_routers();
497}
1da177e4
LT		 498#endif
499
500/* Nobody refers to this ifaddr, destroy it */
501
502void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503{
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506#ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508#endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522}
523
e55ffac6
BH		 524static void
525ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526{
527 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
8a6ce0c0 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542}
543
1da177e4
LT		 544/* On success it returns ifp with increased reference count */
545
546static struct inet6_ifaddr *
547ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 548 int scope, u32 flags)
1da177e4
LT		 549{
550 struct inet6_ifaddr *ifa = NULL;
551 struct rt6_info *rt;
552 int hash;
553 int err = 0;
554
8814c4b5 555 rcu_read_lock_bh();
1da177e4
LT		 556 if (idev->dead) {
557 err = -ENODEV; /*XXX*/
558 goto out2;
559 }
560
561 write_lock(&addrconf_hash_lock);
562
563 /* Ignore adding duplicate addresses on an interface */
06bfe655 564 if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
1da177e4
LT		 565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
322f74a4 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
1da177e4
LT		 584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
57f5f544
KF		 594 ifa->rt = rt;
595
95c385b4
NH		 596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
1da177e4
LT		 606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
e55ffac6 621 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 622
623#ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629#endif
630
1da177e4
LT		 631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633out2:
8814c4b5 634 rcu_read_unlock_bh();
1da177e4 635
fd92833a 636 if (likely(err == 0))
e041c683 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647}
648
649/* This function wants to get referenced ifp and releases it before return */
650
651static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652{
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676#ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692#endif
693
1d142804 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
1d142804 702 continue;
1da177e4
LT		 703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
1d142804 726 ifap = &ifa->if_next;
1da177e4
LT		 727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
e041c683 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
754
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
e0a1ad73 760 ip6_del_rt(rt);
1da177e4
LT		 761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771}
772
773#ifdef CONFIG_IPV6_PRIVACY
774static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775{
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
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 */
072047e4
YH		 880struct ipv6_saddr_score {
881 int addr_type;
882 unsigned int attrs;
883 int matchlen;
0d27b427 884 int scope;
072047e4
YH		 885 unsigned int rule;
886};
887
888#define IPV6_SADDR_SCORE_LOCAL 0x0001
889#define IPV6_SADDR_SCORE_PREFERRED 0x0004
890#define IPV6_SADDR_SCORE_HOA 0x0008
891#define IPV6_SADDR_SCORE_OIF 0x0010
892#define IPV6_SADDR_SCORE_LABEL 0x0020
893#define IPV6_SADDR_SCORE_PRIVACY 0x0040
894
b6f99a21 895static inline int ipv6_saddr_preferred(int type)
1da177e4 896{
072047e4
YH		 897 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
899 return 1;
900 return 0;
1da177e4
LT		 901}
902
072047e4 903int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 904 struct in6_addr *daddr, struct in6_addr *saddr)
905{
072047e4
YH		 906 struct ipv6_saddr_score hiscore;
907 struct inet6_ifaddr *ifa_result = NULL;
908 int daddr_type = __ipv6_addr_type(daddr);
909 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 910 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
911 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 912 struct net_device *dev;
1da177e4 913
072047e4 914 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 915
072047e4 916 read_lock(&dev_base_lock);
8814c4b5 917 rcu_read_lock();
1da177e4 918
881d966b 919 for_each_netdev(&init_net, dev) {
072047e4
YH		 920 struct inet6_dev *idev;
921 struct inet6_ifaddr *ifa;
922
923 /* Rule 0: Candidate Source Address (section 4)
924 * - multicast and link-local destination address,
925 * the set of candidate source address MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same link as the outgoing
928 * interface.
929 * (- For site-local destination addresses, the
930 * set of candidate source addresses MUST only
931 * include addresses assigned to interfaces
932 * belonging to the same site as the outgoing
933 * interface.)
934 */
935 if ((daddr_type & IPV6_ADDR_MULTICAST ||
936 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
937 daddr_dev && dev != daddr_dev)
938 continue;
1da177e4 939
1da177e4 940 idev = __in6_dev_get(dev);
072047e4
YH		 941 if (!idev)
942 continue;
943
944 read_lock_bh(&idev->lock);
945 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
946 struct ipv6_saddr_score score;
947
948 score.addr_type = __ipv6_addr_type(&ifa->addr);
949
6b3ae80a
YH		 950 /* Rule 0:
951 * - Tentative Address (RFC2462 section 5.4)
952 * - A tentative address is not considered
953 * "assigned to an interface" in the traditional
95c385b4 954 * sense, unless it is also flagged as optimistic.
6b3ae80a 955 * - Candidate Source Address (section 4)
072047e4
YH		 956 * - In any case, anycast addresses, multicast
957 * addresses, and the unspecified address MUST
958 * NOT be included in a candidate set.
959 */
95c385b4
NH		 960 if ((ifa->flags & IFA_F_TENTATIVE) &&
961 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 962 continue;
072047e4
YH		 963 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
964 score.addr_type & IPV6_ADDR_MULTICAST)) {
965 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 966 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 967 "assigned as unicast address on %s",
968 dev->name);
969 continue;
970 }
971
972 score.attrs = 0;
973 score.matchlen = 0;
974 score.scope = 0;
975 score.rule = 0;
976
977 if (ifa_result == NULL) {
978 /* record it if the first available entry */
979 goto record_it;
980 }
981
982 /* Rule 1: Prefer same address */
983 if (hiscore.rule < 1) {
984 if (ipv6_addr_equal(&ifa_result->addr, daddr))
985 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 hiscore.rule++;
987 }
988 if (ipv6_addr_equal(&ifa->addr, daddr)) {
989 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
991 score.rule = 1;
992 goto record_it;
1da177e4 993 }
072047e4
YH		 994 } else {
995 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
996 continue;
1da177e4 997 }
1da177e4 998
072047e4
YH		 999 /* Rule 2: Prefer appropriate scope */
1000 if (hiscore.rule < 2) {
1001 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002 hiscore.rule++;
1003 }
1004 score.scope = __ipv6_addr_src_scope(score.addr_type);
1005 if (hiscore.scope < score.scope) {
1006 if (hiscore.scope < daddr_scope) {
1007 score.rule = 2;
1008 goto record_it;
1009 } else
1010 continue;
1011 } else if (score.scope < hiscore.scope) {
1012 if (score.scope < daddr_scope)
e55ffac6 1013 break; /* addresses sorted by scope */
072047e4
YH		 1014 else {
1015 score.rule = 2;
1016 goto record_it;
1017 }
1018 }
1da177e4 1019
95c385b4 1020 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1021 if (hiscore.rule < 3) {
1022 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1023 (((ifa_result->flags &
1024 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1025 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026 hiscore.rule++;
1027 }
1028 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1029 (((ifa->flags &
95c385b4 1030 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033 score.rule = 3;
1034 goto record_it;
1035 }
1036 } else {
1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038 continue;
1039 }
1da177e4 1040
3b9f9a1c 1041 /* Rule 4: Prefer home address */
59fbb3a6 1042#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1043 if (hiscore.rule < 4) {
1044 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046 hiscore.rule++;
1047 }
1048 if (ifa->flags & IFA_F_HOMEADDRESS) {
1049 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051 score.rule = 4;
1052 goto record_it;
1053 }
1054 } else {
1055 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056 continue;
1057 }
1058#else
220bbd74
YH		 1059 if (hiscore.rule < 4)
1060 hiscore.rule++;
3b9f9a1c 1061#endif
072047e4
YH		 1062
1063 /* Rule 5: Prefer outgoing interface */
1064 if (hiscore.rule < 5) {
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa_result->idev->dev)
1067 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068 hiscore.rule++;
1069 }
1070 if (daddr_dev == NULL ||
1071 daddr_dev == ifa->idev->dev) {
1072 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074 score.rule = 5;
1075 goto record_it;
1076 }
1077 } else {
1078 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079 continue;
1080 }
1081
1082 /* Rule 6: Prefer matching label */
1083 if (hiscore.rule < 6) {
c1ee656c 1084 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1085 hiscore.addr_type,
1086 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088 hiscore.rule++;
1089 }
c1ee656c 1090 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1091 score.addr_type,
1092 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1093 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095 score.rule = 6;
1096 goto record_it;
1da177e4 1097 }
072047e4
YH		 1098 } else {
1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100 continue;
1101 }
1102
44fd0261 1103#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1104 /* Rule 7: Prefer public address
1105 * Note: prefer temprary address if use_tempaddr >= 2
1106 */
1107 if (hiscore.rule < 7) {
1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 hiscore.rule++;
1112 }
1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117 score.rule = 7;
1118 goto record_it;
1119 }
1120 } else {
1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122 continue;
1123 }
5e2707fa
YH		 1124#else
1125 if (hiscore.rule < 7)
1126 hiscore.rule++;
44fd0261 1127#endif
072047e4 1128 /* Rule 8: Use longest matching prefix */
12da2a43 1129 if (hiscore.rule < 8) {
072047e4 1130 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1131 hiscore.rule++;
1132 }
072047e4
YH		 1133 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134 if (score.matchlen > hiscore.matchlen) {
1135 score.rule = 8;
1136 goto record_it;
1da177e4 1137 }
072047e4
YH		 1138#if 0
1139 else if (score.matchlen < hiscore.matchlen)
1140 continue;
1141#endif
1142
1143 /* Final Rule: choose first available one */
1144 continue;
1145record_it:
1146 if (ifa_result)
1147 in6_ifa_put(ifa_result);
1148 in6_ifa_hold(ifa);
1149 ifa_result = ifa;
1150 hiscore = score;
1da177e4 1151 }
072047e4 1152 read_unlock_bh(&idev->lock);
1da177e4 1153 }
8814c4b5 1154 rcu_read_unlock();
1da177e4
LT		 1155 read_unlock(&dev_base_lock);
1156
072047e4
YH		 1157 if (!ifa_result)
1158 return -EADDRNOTAVAIL;
1ab1457c 1159
072047e4
YH		 1160 ipv6_addr_copy(saddr, &ifa_result->addr);
1161 in6_ifa_put(ifa_result);
1162 return 0;
1da177e4
LT		 1163}
1164
1165
1166int ipv6_get_saddr(struct dst_entry *dst,
1167 struct in6_addr *daddr, struct in6_addr *saddr)
1168{
7a3025b1 1169 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1170}
1171
7159039a 1172EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1173
95c385b4
NH		 1174int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175 unsigned char banned_flags)
1da177e4
LT		 1176{
1177 struct inet6_dev *idev;
1178 int err = -EADDRNOTAVAIL;
1179
8814c4b5 1180 rcu_read_lock();
1da177e4
LT		 1181 if ((idev = __in6_dev_get(dev)) != NULL) {
1182 struct inet6_ifaddr *ifp;
1183
1184 read_lock_bh(&idev->lock);
1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1186 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1187 ipv6_addr_copy(addr, &ifp->addr);
1188 err = 0;
1189 break;
1190 }
1191 }
1192 read_unlock_bh(&idev->lock);
1193 }
8814c4b5 1194 rcu_read_unlock();
1da177e4
LT		 1195 return err;
1196}
1197
1198static int ipv6_count_addresses(struct inet6_dev *idev)
1199{
1200 int cnt = 0;
1201 struct inet6_ifaddr *ifp;
1202
1203 read_lock_bh(&idev->lock);
1204 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205 cnt++;
1206 read_unlock_bh(&idev->lock);
1207 return cnt;
1208}
1209
bfeade08
DL		 1210int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211 struct net_device *dev, int strict)
1da177e4
LT		 1212{
1213 struct inet6_ifaddr * ifp;
1214 u8 hash = ipv6_addr_hash(addr);
1215
1216 read_lock_bh(&addrconf_hash_lock);
1217 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
bfeade08
DL		 1218 if (ifp->idev->dev->nd_net != net)
1219 continue;
1da177e4
LT		 1220 if (ipv6_addr_equal(&ifp->addr, addr) &&
1221 !(ifp->flags&IFA_F_TENTATIVE)) {
1222 if (dev == NULL || ifp->idev->dev == dev ||
1223 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1224 break;
1225 }
1226 }
1227 read_unlock_bh(&addrconf_hash_lock);
1228 return ifp != NULL;
1229}
7159039a
YH		 1230EXPORT_SYMBOL(ipv6_chk_addr);
1231
1da177e4 1232static
06bfe655
DL		 1233int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234 struct net_device *dev)
1da177e4
LT		 1235{
1236 struct inet6_ifaddr * ifp;
1237 u8 hash = ipv6_addr_hash(addr);
1238
1239 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
06bfe655
DL		 1240 if (ifp->idev->dev->nd_net != net)
1241 continue;
1da177e4
LT		 1242 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243 if (dev == NULL || ifp->idev->dev == dev)
1244 break;
1245 }
1246 }
1247 return ifp != NULL;
1248}
1249
1cab3da6
DL		 1250struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251 struct net_device *dev, int strict)
1da177e4
LT		 1252{
1253 struct inet6_ifaddr * ifp;
1254 u8 hash = ipv6_addr_hash(addr);
1255
1256 read_lock_bh(&addrconf_hash_lock);
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1cab3da6
DL		 1258 if (ifp->idev->dev->nd_net != net)
1259 continue;
1da177e4
LT		 1260 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 if (dev == NULL || ifp->idev->dev == dev ||
1262 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1263 in6_ifa_hold(ifp);
1264 break;
1265 }
1266 }
1267 }
1268 read_unlock_bh(&addrconf_hash_lock);
1269
1270 return ifp;
1271}
1272
1273int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1274{
1275 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1276 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1277 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1279 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1280 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1281 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1283
1284 if (!sk2_rcv_saddr && !sk_ipv6only)
1285 return 1;
1286
1287 if (addr_type2 == IPV6_ADDR_ANY &&
1288 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1289 return 1;
1290
1291 if (addr_type == IPV6_ADDR_ANY &&
1292 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1293 return 1;
1294
1295 if (sk2_rcv_saddr6 &&
1296 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1297 return 1;
1298
1299 if (addr_type == IPV6_ADDR_MAPPED &&
1300 !sk2_ipv6only &&
1301 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1302 return 1;
1303
1304 return 0;
1305}
1306
1307/* Gets referenced address, destroys ifaddr */
1308
9f5336e2 1309static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1310{
1da177e4
LT		 1311 if (ifp->flags&IFA_F_PERMANENT) {
1312 spin_lock_bh(&ifp->lock);
1313 addrconf_del_timer(ifp);
1314 ifp->flags |= IFA_F_TENTATIVE;
1315 spin_unlock_bh(&ifp->lock);
1316 in6_ifa_put(ifp);
1317#ifdef CONFIG_IPV6_PRIVACY
1318 } else if (ifp->flags&IFA_F_TEMPORARY) {
1319 struct inet6_ifaddr *ifpub;
1320 spin_lock_bh(&ifp->lock);
1321 ifpub = ifp->ifpub;
1322 if (ifpub) {
1323 in6_ifa_hold(ifpub);
1324 spin_unlock_bh(&ifp->lock);
1325 ipv6_create_tempaddr(ifpub, ifp);
1326 in6_ifa_put(ifpub);
1327 } else {
1328 spin_unlock_bh(&ifp->lock);
1329 }
1330 ipv6_del_addr(ifp);
1331#endif
1332 } else
1333 ipv6_del_addr(ifp);
1334}
1335
3c21edbd
YH		 1336void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1337{
1338 if (net_ratelimit())
1339 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340 addrconf_dad_stop(ifp);
1341}
1da177e4
LT		 1342
1343/* Join to solicited addr multicast group. */
1344
1345void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1346{
1347 struct in6_addr maddr;
1348
1349 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1350 return;
1351
1352 addrconf_addr_solict_mult(addr, &maddr);
1353 ipv6_dev_mc_inc(dev, &maddr);
1354}
1355
1356void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1357{
1358 struct in6_addr maddr;
1359
1360 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1361 return;
1362
1363 addrconf_addr_solict_mult(addr, &maddr);
1364 __ipv6_dev_mc_dec(idev, &maddr);
1365}
1366
20380731 1367static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1368{
1369 struct in6_addr addr;
1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371 if (ipv6_addr_any(&addr))
1372 return;
1373 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1374}
1375
20380731 1376static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1377{
1378 struct in6_addr addr;
1379 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380 if (ipv6_addr_any(&addr))
1381 return;
1382 __ipv6_dev_ac_dec(ifp->idev, &addr);
1383}
1384
073a8e0e
YH		 1385static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1386{
1387 if (dev->addr_len != ETH_ALEN)
1388 return -1;
1389 memcpy(eui, dev->dev_addr, 3);
1390 memcpy(eui + 5, dev->dev_addr + 3, 3);
1391
1392 /*
1393 * The zSeries OSA network cards can be shared among various
1394 * OS instances, but the OSA cards have only one MAC address.
1395 * This leads to duplicate address conflicts in conjunction
1396 * with IPv6 if more than one instance uses the same card.
1397 *
1398 * The driver for these cards can deliver a unique 16-bit
1399 * identifier for each instance sharing the same card. It is
1400 * placed instead of 0xFFFE in the interface identifier. The
1401 * "u" bit of the interface identifier is not inverted in this
1402 * case. Hence the resulting interface identifier has local
1403 * scope according to RFC2373.
1404 */
1405 if (dev->dev_id) {
1406 eui[3] = (dev->dev_id >> 8) & 0xFF;
1407 eui[4] = dev->dev_id & 0xFF;
1408 } else {
1409 eui[3] = 0xFF;
1410 eui[4] = 0xFE;
1411 eui[0] ^= 2;
1412 }
1413 return 0;
1414}
1415
1416static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1417{
1418 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419 if (dev->addr_len != ARCNET_ALEN)
1420 return -1;
1421 memset(eui, 0, 7);
1422 eui[7] = *(u8*)dev->dev_addr;
1423 return 0;
1424}
1425
1426static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1427{
1428 if (dev->addr_len != INFINIBAND_ALEN)
1429 return -1;
1430 memcpy(eui, dev->dev_addr + 12, 8);
1431 eui[0] |= 2;
1432 return 0;
1433}
1434
1da177e4
LT		 1435static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1436{
1437 switch (dev->type) {
1438 case ARPHRD_ETHER:
1439 case ARPHRD_FDDI:
1440 case ARPHRD_IEEE802_TR:
073a8e0e 1441 return addrconf_ifid_eui48(eui, dev);
1da177e4 1442 case ARPHRD_ARCNET:
073a8e0e 1443 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1444 case ARPHRD_INFINIBAND:
073a8e0e 1445 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1446 case ARPHRD_SIT:
1447 if (dev->priv_flags & IFF_ISATAP)
1448 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1449 }
1450 return -1;
1451}
1452
1453static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1454{
1455 int err = -1;
1456 struct inet6_ifaddr *ifp;
1457
1458 read_lock_bh(&idev->lock);
1459 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461 memcpy(eui, ifp->addr.s6_addr+8, 8);
1462 err = 0;
1463 break;
1464 }
1465 }
1466 read_unlock_bh(&idev->lock);
1467 return err;
1468}
1469
1470#ifdef CONFIG_IPV6_PRIVACY
1471/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472static int __ipv6_regen_rndid(struct inet6_dev *idev)
1473{
1da177e4 1474regen:
955189ef 1475 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1476 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1477
1478 /*
1479 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480 * check if generated address is not inappropriate
1481 *
1482 * - Reserved subnet anycast (RFC 2526)
1483 * 11111101 11....11 1xxxxxxx
c7dc89c0 1484 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1485 * 00-00-5E-FE-xx-xx-xx-xx
1486 * - value 0
1487 * - XXX: already assigned to an address on the device
1488 */
1ab1457c 1489 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1490 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491 (idev->rndid[7]&0x80))
1492 goto regen;
1493 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1495 goto regen;
1496 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1497 goto regen;
1498 }
1499
1500 return 0;
1501}
1502
1503static void ipv6_regen_rndid(unsigned long data)
1504{
1505 struct inet6_dev *idev = (struct inet6_dev *) data;
1506 unsigned long expires;
1507
8814c4b5 1508 rcu_read_lock_bh();
1da177e4
LT		 1509 write_lock_bh(&idev->lock);
1510
1511 if (idev->dead)
1512 goto out;
1513
1514 if (__ipv6_regen_rndid(idev) < 0)
1515 goto out;
1ab1457c 1516
1da177e4 1517 expires = jiffies +
1ab1457c 1518 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1519 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520 if (time_before(expires, jiffies)) {
1521 printk(KERN_WARNING
1522 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1523 idev->dev->name);
1524 goto out;
1525 }
1526
1527 if (!mod_timer(&idev->regen_timer, expires))
1528 in6_dev_hold(idev);
1529
1530out:
1531 write_unlock_bh(&idev->lock);
8814c4b5 1532 rcu_read_unlock_bh();
1da177e4
LT		 1533 in6_dev_put(idev);
1534}
1535
1536static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1537 int ret = 0;
1538
1539 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540 ret = __ipv6_regen_rndid(idev);
1541 return ret;
1542}
1543#endif
1544
1545/*
1546 * Add prefix route.
1547 */
1548
1549static void
1550addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1551 unsigned long expires, u32 flags)
1da177e4 1552{
86872cb5
TG		 1553 struct fib6_config cfg = {
1554 .fc_table = RT6_TABLE_PREFIX,
1555 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556 .fc_ifindex = dev->ifindex,
1557 .fc_expires = expires,
1558 .fc_dst_len = plen,
1559 .fc_flags = RTF_UP | flags,
1560 };
1da177e4 1561
86872cb5 1562 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1563
1564 /* Prevent useless cloning on PtP SIT.
1565 This thing is done here expecting that the whole
1566 class of non-broadcast devices need not cloning.
1567 */
0be669bb 1568#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1569 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1570 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1571#endif
1da177e4 1572
86872cb5 1573 ip6_route_add(&cfg);
1da177e4
LT		 1574}
1575
1576/* Create "default" multicast route to the interface */
1577
1578static void addrconf_add_mroute(struct net_device *dev)
1579{
86872cb5
TG		 1580 struct fib6_config cfg = {
1581 .fc_table = RT6_TABLE_LOCAL,
1582 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583 .fc_ifindex = dev->ifindex,
1584 .fc_dst_len = 8,
1585 .fc_flags = RTF_UP,
1586 };
1587
1588 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1589
1590 ip6_route_add(&cfg);
1da177e4
LT		 1591}
1592
0be669bb 1593#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1594static void sit_route_add(struct net_device *dev)
1595{
86872cb5
TG		 1596 struct fib6_config cfg = {
1597 .fc_table = RT6_TABLE_MAIN,
1598 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1599 .fc_ifindex = dev->ifindex,
1600 .fc_dst_len = 96,
1601 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1602 };
1da177e4
LT		 1603
1604 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1605 ip6_route_add(&cfg);
1da177e4 1606}
0be669bb 1607#endif
1da177e4
LT		 1608
1609static void addrconf_add_lroute(struct net_device *dev)
1610{
1611 struct in6_addr addr;
1612
1613 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1614 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1615}
1616
1617static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1618{
1619 struct inet6_dev *idev;
1620
1621 ASSERT_RTNL();
1622
1623 if ((idev = ipv6_find_idev(dev)) == NULL)
1624 return NULL;
1625
1626 /* Add default multicast route */
1627 addrconf_add_mroute(dev);
1628
1629 /* Add link local route */
1630 addrconf_add_lroute(dev);
1631 return idev;
1632}
1633
1634void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1635{
1636 struct prefix_info *pinfo;
1637 __u32 valid_lft;
1638 __u32 prefered_lft;
1639 int addr_type;
1640 unsigned long rt_expires;
1641 struct inet6_dev *in6_dev;
1642
1643 pinfo = (struct prefix_info *) opt;
1ab1457c 1644
1da177e4
LT		 1645 if (len < sizeof(struct prefix_info)) {
1646 ADBG(("addrconf: prefix option too short\n"));
1647 return;
1648 }
1ab1457c 1649
1da177e4
LT		 1650 /*
1651 * Validation checks ([ADDRCONF], page 19)
1652 */
1653
1654 addr_type = ipv6_addr_type(&pinfo->prefix);
1655
1656 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1657 return;
1658
1659 valid_lft = ntohl(pinfo->valid);
1660 prefered_lft = ntohl(pinfo->prefered);
1661
1662 if (prefered_lft > valid_lft) {
1663 if (net_ratelimit())
1664 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1665 return;
1666 }
1667
1668 in6_dev = in6_dev_get(dev);
1669
1670 if (in6_dev == NULL) {
1671 if (net_ratelimit())
1672 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1673 return;
1674 }
1675
1676 /*
1677 * Two things going on here:
1678 * 1) Add routes for on-link prefixes
1679 * 2) Configure prefixes with the auto flag set
1680 */
1681
1682 /* Avoid arithmetic overflow. Really, we could
1683 save rt_expires in seconds, likely valid_lft,
1684 but it would require division in fib gc, that it
1685 not good.
1686 */
1687 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1688 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1689 else
3dd4bc68
YH		 1690 rt_expires = valid_lft * HZ;
1691
1692 /*
1693 * We convert this (in jiffies) to clock_t later.
1694 * Avoid arithmetic overflow there as well.
1695 * Overflow can happen only if HZ < USER_HZ.
1696 */
1697 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1698 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1699
1700 if (pinfo->onlink) {
1701 struct rt6_info *rt;
1702 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1703
1704 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1705 if (rt->rt6i_flags&RTF_EXPIRES) {
1706 if (valid_lft == 0) {
e0a1ad73 1707 ip6_del_rt(rt);
1da177e4
LT		 1708 rt = NULL;
1709 } else {
3dd4bc68 1710 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1711 }
1712 }
1713 } else if (valid_lft) {
1714 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1715 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1716 }
1717 if (rt)
1718 dst_release(&rt->u.dst);
1719 }
1720
1721 /* Try to figure out our local address for this prefix */
1722
1723 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1724 struct inet6_ifaddr * ifp;
1725 struct in6_addr addr;
1726 int create = 0, update_lft = 0;
1727
1728 if (pinfo->prefix_len == 64) {
1729 memcpy(&addr, &pinfo->prefix, 8);
1730 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1731 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1732 in6_dev_put(in6_dev);
1733 return;
1734 }
1735 goto ok;
1736 }
1737 if (net_ratelimit())
1738 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1739 pinfo->prefix_len);
1740 in6_dev_put(in6_dev);
1741 return;
1742
1743ok:
1744
1cab3da6 1745 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1da177e4
LT		 1746
1747 if (ifp == NULL && valid_lft) {
1748 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1749 u32 addr_flags = 0;
1750
1751#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1752 if (in6_dev->cnf.optimistic_dad &&
1753 !ipv6_devconf.forwarding)
1754 addr_flags = IFA_F_OPTIMISTIC;
1755#endif
1da177e4
LT		 1756
1757 /* Do not allow to create too much of autoconfigured
1758 * addresses; this would be too easy way to crash kernel.
1759 */
1760 if (!max_addresses ||
1761 ipv6_count_addresses(in6_dev) < max_addresses)
1762 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1763 addr_type&IPV6_ADDR_SCOPE_MASK,
1764 addr_flags);
1da177e4
LT		 1765
1766 if (!ifp || IS_ERR(ifp)) {
1767 in6_dev_put(in6_dev);
1768 return;
1769 }
1770
1771 update_lft = create = 1;
1772 ifp->cstamp = jiffies;
1773 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1774 }
1775
1776 if (ifp) {
1777 int flags;
1778 unsigned long now;
1779#ifdef CONFIG_IPV6_PRIVACY
1780 struct inet6_ifaddr *ift;
1781#endif
1782 u32 stored_lft;
1783
1784 /* update lifetime (RFC2462 5.5.3 e) */
1785 spin_lock(&ifp->lock);
1786 now = jiffies;
1787 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1788 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1789 else
1790 stored_lft = 0;
1791 if (!update_lft && stored_lft) {
1792 if (valid_lft > MIN_VALID_LIFETIME ||
1793 valid_lft > stored_lft)
1794 update_lft = 1;
1795 else if (stored_lft <= MIN_VALID_LIFETIME) {
1796 /* valid_lft <= stored_lft is always true */
1797 /* XXX: IPsec */
1798 update_lft = 0;
1799 } else {
1800 valid_lft = MIN_VALID_LIFETIME;
1801 if (valid_lft < prefered_lft)
1802 prefered_lft = valid_lft;
1803 update_lft = 1;
1804 }
1805 }
1806
1807 if (update_lft) {
1808 ifp->valid_lft = valid_lft;
1809 ifp->prefered_lft = prefered_lft;
1810 ifp->tstamp = now;
1811 flags = ifp->flags;
1812 ifp->flags &= ~IFA_F_DEPRECATED;
1813 spin_unlock(&ifp->lock);
1814
1815 if (!(flags&IFA_F_TENTATIVE))
1816 ipv6_ifa_notify(0, ifp);
1817 } else
1818 spin_unlock(&ifp->lock);
1819
1820#ifdef CONFIG_IPV6_PRIVACY
1821 read_lock_bh(&in6_dev->lock);
1822 /* update all temporary addresses in the list */
1823 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1824 /*
1825 * When adjusting the lifetimes of an existing
1826 * temporary address, only lower the lifetimes.
1827 * Implementations must not increase the
1828 * lifetimes of an existing temporary address
1829 * when processing a Prefix Information Option.
1830 */
1831 spin_lock(&ift->lock);
1832 flags = ift->flags;
1833 if (ift->valid_lft > valid_lft &&
1834 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1835 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1836 if (ift->prefered_lft > prefered_lft &&
1837 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1838 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1839 spin_unlock(&ift->lock);
1840 if (!(flags&IFA_F_TENTATIVE))
1841 ipv6_ifa_notify(0, ift);
1842 }
1843
1844 if (create && in6_dev->cnf.use_tempaddr > 0) {
1845 /*
1846 * When a new public address is created as described in [ADDRCONF],
1847 * also create a new temporary address.
1848 */
1ab1457c 1849 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1850 ipv6_create_tempaddr(ifp, NULL);
1851 } else {
1852 read_unlock_bh(&in6_dev->lock);
1853 }
1854#endif
1855 in6_ifa_put(ifp);
1856 addrconf_verify(0);
1857 }
1858 }
1859 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1860 in6_dev_put(in6_dev);
1861}
1862
1863/*
1864 * Set destination address.
1865 * Special case for SIT interfaces where we create a new "virtual"
1866 * device.
1867 */
1868int addrconf_set_dstaddr(void __user *arg)
1869{
1870 struct in6_ifreq ireq;
1871 struct net_device *dev;
1872 int err = -EINVAL;
1873
1874 rtnl_lock();
1875
1876 err = -EFAULT;
1877 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1878 goto err_exit;
1879
881d966b 1880 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1881
1882 err = -ENODEV;
1883 if (dev == NULL)
1884 goto err_exit;
1885
0be669bb 1886#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1887 if (dev->type == ARPHRD_SIT) {
1888 struct ifreq ifr;
1889 mm_segment_t oldfs;
1890 struct ip_tunnel_parm p;
1891
1892 err = -EADDRNOTAVAIL;
1893 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1894 goto err_exit;
1895
1896 memset(&p, 0, sizeof(p));
1897 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1898 p.iph.saddr = 0;
1899 p.iph.version = 4;
1900 p.iph.ihl = 5;
1901 p.iph.protocol = IPPROTO_IPV6;
1902 p.iph.ttl = 64;
1903 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1904
1905 oldfs = get_fs(); set_fs(KERNEL_DS);
1906 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1907 set_fs(oldfs);
1908
1909 if (err == 0) {
1910 err = -ENOBUFS;
881d966b 1911 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1912 goto err_exit;
1913 err = dev_open(dev);
1914 }
1915 }
0be669bb 1916#endif
1da177e4
LT		 1917
1918err_exit:
1919 rtnl_unlock();
1920 return err;
1921}
1922
1923/*
1924 * Manual configuration of address on an interface
1925 */
0778769d 1926static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1927 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1928{
1929 struct inet6_ifaddr *ifp;
1930 struct inet6_dev *idev;
1931 struct net_device *dev;
1932 int scope;
46d48046 1933 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1934
1935 ASSERT_RTNL();
1ab1457c 1936
0778769d
NT		 1937 /* check the lifetime */
1938 if (!valid_lft || prefered_lft > valid_lft)
1939 return -EINVAL;
1940
881d966b 1941 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1942 return -ENODEV;
1ab1457c 1943
1da177e4
LT		 1944 if ((idev = addrconf_add_dev(dev)) == NULL)
1945 return -ENOBUFS;
1946
1947 scope = ipv6_addr_scope(pfx);
1948
46d48046 1949 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1950 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1951 flags = 0;
1952 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1953 valid_lft = 0x7FFFFFFF/HZ;
1954
1955 if (prefered_lft == 0)
1956 ifa_flags |= IFA_F_DEPRECATED;
1957 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1958 (prefered_lft != INFINITY_LIFE_TIME))
1959 prefered_lft = 0x7FFFFFFF/HZ;
1960
1961 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1962
1da177e4 1963 if (!IS_ERR(ifp)) {
06aebfb7 1964 spin_lock_bh(&ifp->lock);
0778769d
NT		 1965 ifp->valid_lft = valid_lft;
1966 ifp->prefered_lft = prefered_lft;
1967 ifp->tstamp = jiffies;
06aebfb7 1968 spin_unlock_bh(&ifp->lock);
0778769d 1969
46d48046
YH		 1970 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1971 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1972 /*
1973 * Note that section 3.1 of RFC 4429 indicates
1974 * that the Optimistic flag should not be set for
1975 * manually configured addresses
1976 */
1da177e4
LT		 1977 addrconf_dad_start(ifp, 0);
1978 in6_ifa_put(ifp);
0778769d 1979 addrconf_verify(0);
1da177e4
LT		 1980 return 0;
1981 }
1982
1983 return PTR_ERR(ifp);
1984}
1985
1986static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1987{
1988 struct inet6_ifaddr *ifp;
1989 struct inet6_dev *idev;
1990 struct net_device *dev;
1ab1457c 1991
881d966b 1992 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1993 return -ENODEV;
1994
1995 if ((idev = __in6_dev_get(dev)) == NULL)
1996 return -ENXIO;
1997
1998 read_lock_bh(&idev->lock);
1999 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2000 if (ifp->prefix_len == plen &&
2001 ipv6_addr_equal(pfx, &ifp->addr)) {
2002 in6_ifa_hold(ifp);
2003 read_unlock_bh(&idev->lock);
1ab1457c 2004
1da177e4
LT		 2005 ipv6_del_addr(ifp);
2006
2007 /* If the last address is deleted administratively,
2008 disable IPv6 on this interface.
2009 */
2010 if (idev->addr_list == NULL)
2011 addrconf_ifdown(idev->dev, 1);
2012 return 0;
2013 }
2014 }
2015 read_unlock_bh(&idev->lock);
2016 return -EADDRNOTAVAIL;
2017}
2018
2019
2020int addrconf_add_ifaddr(void __user *arg)
2021{
2022 struct in6_ifreq ireq;
2023 int err;
1ab1457c 2024
1da177e4
LT		 2025 if (!capable(CAP_NET_ADMIN))
2026 return -EPERM;
1ab1457c 2027
1da177e4
LT		 2028 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029 return -EFAULT;
2030
2031 rtnl_lock();
0778769d 2032 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2033 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2034 rtnl_unlock();
2035 return err;
2036}
2037
2038int addrconf_del_ifaddr(void __user *arg)
2039{
2040 struct in6_ifreq ireq;
2041 int err;
1ab1457c 2042
1da177e4
LT		 2043 if (!capable(CAP_NET_ADMIN))
2044 return -EPERM;
2045
2046 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2047 return -EFAULT;
2048
2049 rtnl_lock();
2050 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2051 rtnl_unlock();
2052 return err;
2053}
2054
0be669bb 2055#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2056static void sit_add_v4_addrs(struct inet6_dev *idev)
2057{
2058 struct inet6_ifaddr * ifp;
2059 struct in6_addr addr;
2060 struct net_device *dev;
2061 int scope;
2062
2063 ASSERT_RTNL();
2064
2065 memset(&addr, 0, sizeof(struct in6_addr));
2066 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2067
2068 if (idev->dev->flags&IFF_POINTOPOINT) {
2069 addr.s6_addr32[0] = htonl(0xfe800000);
2070 scope = IFA_LINK;
2071 } else {
2072 scope = IPV6_ADDR_COMPATv4;
2073 }
2074
2075 if (addr.s6_addr32[3]) {
2076 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2077 if (!IS_ERR(ifp)) {
2078 spin_lock_bh(&ifp->lock);
2079 ifp->flags &= ~IFA_F_TENTATIVE;
2080 spin_unlock_bh(&ifp->lock);
2081 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2082 in6_ifa_put(ifp);
2083 }
2084 return;
2085 }
2086
881d966b 2087 for_each_netdev(&init_net, dev) {
e5ed6399 2088 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2089 if (in_dev && (dev->flags & IFF_UP)) {
2090 struct in_ifaddr * ifa;
2091
2092 int flag = scope;
2093
2094 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2095 int plen;
2096
2097 addr.s6_addr32[3] = ifa->ifa_local;
2098
2099 if (ifa->ifa_scope == RT_SCOPE_LINK)
2100 continue;
2101 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2102 if (idev->dev->flags&IFF_POINTOPOINT)
2103 continue;
2104 flag |= IFA_HOST;
2105 }
2106 if (idev->dev->flags&IFF_POINTOPOINT)
2107 plen = 64;
2108 else
2109 plen = 96;
2110
2111 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2112 IFA_F_PERMANENT);
2113 if (!IS_ERR(ifp)) {
2114 spin_lock_bh(&ifp->lock);
2115 ifp->flags &= ~IFA_F_TENTATIVE;
2116 spin_unlock_bh(&ifp->lock);
2117 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2118 in6_ifa_put(ifp);
2119 }
2120 }
2121 }
1ab1457c 2122 }
1da177e4 2123}
0be669bb 2124#endif
1da177e4
LT		 2125
2126static void init_loopback(struct net_device *dev)
2127{
2128 struct inet6_dev *idev;
2129 struct inet6_ifaddr * ifp;
2130
2131 /* ::1 */
2132
2133 ASSERT_RTNL();
2134
2135 if ((idev = ipv6_find_idev(dev)) == NULL) {
2136 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2137 return;
2138 }
2139
2140 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2141 if (!IS_ERR(ifp)) {
2142 spin_lock_bh(&ifp->lock);
2143 ifp->flags &= ~IFA_F_TENTATIVE;
2144 spin_unlock_bh(&ifp->lock);
2145 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2146 in6_ifa_put(ifp);
2147 }
2148}
2149
2150static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2151{
2152 struct inet6_ifaddr * ifp;
95c385b4
NH		 2153 u32 addr_flags = IFA_F_PERMANENT;
2154
2155#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2156 if (idev->cnf.optimistic_dad &&
2157 !ipv6_devconf.forwarding)
2158 addr_flags |= IFA_F_OPTIMISTIC;
2159#endif
1da177e4 2160
95c385b4
NH		 2161
2162 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2163 if (!IS_ERR(ifp)) {
46d48046 2164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2165 addrconf_dad_start(ifp, 0);
2166 in6_ifa_put(ifp);
2167 }
2168}
2169
2170static void addrconf_dev_config(struct net_device *dev)
2171{
2172 struct in6_addr addr;
2173 struct inet6_dev * idev;
2174
2175 ASSERT_RTNL();
2176
74235a25
HX		 2177 if ((dev->type != ARPHRD_ETHER) &&
2178 (dev->type != ARPHRD_FDDI) &&
2179 (dev->type != ARPHRD_IEEE802_TR) &&
2180 (dev->type != ARPHRD_ARCNET) &&
2181 (dev->type != ARPHRD_INFINIBAND)) {
2182 /* Alas, we support only Ethernet autoconfiguration. */
2183 return;
2184 }
2185
1da177e4
LT		 2186 idev = addrconf_add_dev(dev);
2187 if (idev == NULL)
2188 return;
2189
2190 memset(&addr, 0, sizeof(struct in6_addr));
2191 addr.s6_addr32[0] = htonl(0xFE800000);
2192
2193 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2194 addrconf_add_linklocal(idev, &addr);
2195}
2196
0be669bb 2197#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2198static void addrconf_sit_config(struct net_device *dev)
2199{
2200 struct inet6_dev *idev;
2201
2202 ASSERT_RTNL();
2203
1ab1457c
YH		 2204 /*
2205 * Configure the tunnel with one of our IPv4
2206 * addresses... we should configure all of
1da177e4
LT		 2207 * our v4 addrs in the tunnel
2208 */
2209
2210 if ((idev = ipv6_find_idev(dev)) == NULL) {
2211 printk(KERN_DEBUG "init sit: add_dev failed\n");
2212 return;
2213 }
2214
c7dc89c0
FT		 2215 if (dev->priv_flags & IFF_ISATAP) {
2216 struct in6_addr addr;
2217
2218 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2219 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2220 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2221 addrconf_add_linklocal(idev, &addr);
2222 return;
2223 }
2224
1da177e4
LT		 2225 sit_add_v4_addrs(idev);
2226
2227 if (dev->flags&IFF_POINTOPOINT) {
2228 addrconf_add_mroute(dev);
2229 addrconf_add_lroute(dev);
2230 } else
2231 sit_route_add(dev);
2232}
0be669bb 2233#endif
1da177e4
LT		 2234
2235static inline int
2236ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2237{
2238 struct in6_addr lladdr;
2239
95c385b4 2240 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2241 addrconf_add_linklocal(idev, &lladdr);
2242 return 0;
2243 }
2244 return -1;
2245}
2246
2247static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2248{
2249 struct net_device *link_dev;
2250
2251 /* first try to inherit the link-local address from the link device */
2252 if (idev->dev->iflink &&
881d966b 2253 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2254 if (!ipv6_inherit_linklocal(idev, link_dev))
2255 return;
2256 }
2257 /* then try to inherit it from any device */
881d966b 2258 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2259 if (!ipv6_inherit_linklocal(idev, link_dev))
2260 return;
2261 }
2262 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2263}
2264
2265/*
2266 * Autoconfigure tunnel with a link-local address so routing protocols,
2267 * DHCPv6, MLD etc. can be run over the virtual link
2268 */
2269
2270static void addrconf_ip6_tnl_config(struct net_device *dev)
2271{
2272 struct inet6_dev *idev;
2273
2274 ASSERT_RTNL();
2275
2276 if ((idev = addrconf_add_dev(dev)) == NULL) {
2277 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2278 return;
2279 }
2280 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2281}
2282
1ab1457c 2283static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2284 void * data)
2285{
2286 struct net_device *dev = (struct net_device *) data;
74235a25 2287 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2288 int run_pending = 0;
b217d616 2289 int err;
1da177e4 2290
e9dc8653
EB		 2291 if (dev->nd_net != &init_net)
2292 return NOTIFY_DONE;
2293
1da177e4 2294 switch(event) {
45ba9dd2 2295 case NETDEV_REGISTER:
74235a25 2296 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2297 idev = ipv6_add_dev(dev);
2298 if (!idev)
b217d616 2299 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2300 }
2301 break;
1da177e4 2302 case NETDEV_UP:
3c21edbd 2303 case NETDEV_CHANGE:
c2edacf8
JV		 2304 if (dev->flags & IFF_SLAVE)
2305 break;
2306
3c21edbd 2307 if (event == NETDEV_UP) {
f24e3d65 2308 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2309 /* device is not ready yet. */
2310 printk(KERN_INFO
2311 "ADDRCONF(NETDEV_UP): %s: "
2312 "link is not ready\n",
2313 dev->name);
2314 break;
2315 }
99081049 2316
d31c7b8f
EP		 2317 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2318 idev = ipv6_add_dev(dev);
2319
99081049
KS		 2320 if (idev)
2321 idev->if_flags |= IF_READY;
3c21edbd 2322 } else {
f24e3d65 2323 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2324 /* device is still not ready. */
2325 break;
2326 }
2327
2328 if (idev) {
2329 if (idev->if_flags & IF_READY) {
2330 /* device is already configured. */
2331 break;
2332 }
2333 idev->if_flags |= IF_READY;
2334 }
2335
2336 printk(KERN_INFO
2337 "ADDRCONF(NETDEV_CHANGE): %s: "
2338 "link becomes ready\n",
2339 dev->name);
2340
c5e33bdd 2341 run_pending = 1;
3c21edbd
YH		 2342 }
2343
1da177e4 2344 switch(dev->type) {
0be669bb 2345#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2346 case ARPHRD_SIT:
2347 addrconf_sit_config(dev);
2348 break;
0be669bb 2349#endif
1da177e4
LT		 2350 case ARPHRD_TUNNEL6:
2351 addrconf_ip6_tnl_config(dev);
2352 break;
2353 case ARPHRD_LOOPBACK:
2354 init_loopback(dev);
2355 break;
2356
2357 default:
2358 addrconf_dev_config(dev);
2359 break;
3ff50b79 2360 }
1da177e4 2361 if (idev) {
c5e33bdd
YH		 2362 if (run_pending)
2363 addrconf_dad_run(idev);
2364
1da177e4
LT		 2365 /* If the MTU changed during the interface down, when the
2366 interface up, the changed MTU must be reflected in the
2367 idev as well as routers.
2368 */
2369 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2370 rt6_mtu_change(dev, dev->mtu);
2371 idev->cnf.mtu6 = dev->mtu;
2372 }
2373 idev->tstamp = jiffies;
2374 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2375 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2376 stop IPv6 on this interface.
2377 */
2378 if (dev->mtu < IPV6_MIN_MTU)
2379 addrconf_ifdown(dev, event != NETDEV_DOWN);
2380 }
2381 break;
2382
2383 case NETDEV_CHANGEMTU:
d31c7b8f 2384 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2385 rt6_mtu_change(dev, dev->mtu);
2386 idev->cnf.mtu6 = dev->mtu;
2387 break;
2388 }
2389
d31c7b8f
EP		 2390 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2391 idev = ipv6_add_dev(dev);
2392 if (idev)
2393 break;
2394 }
2395
1da177e4
LT		 2396 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2397
2398 case NETDEV_DOWN:
2399 case NETDEV_UNREGISTER:
2400 /*
2401 * Remove all addresses from this interface.
2402 */
2403 addrconf_ifdown(dev, event != NETDEV_DOWN);
2404 break;
3c21edbd 2405
1da177e4 2406 case NETDEV_CHANGENAME:
1da177e4 2407 if (idev) {
5632c515 2408 snmp6_unregister_dev(idev);
408c4768 2409 addrconf_sysctl_unregister(idev);
f52295a9 2410 addrconf_sysctl_register(idev);
b217d616
HX		 2411 err = snmp6_register_dev(idev);
2412 if (err)
2413 return notifier_from_errno(err);
5632c515 2414 }
1da177e4 2415 break;
3ff50b79 2416 }
1da177e4
LT		 2417
2418 return NOTIFY_OK;
2419}
2420
2421/*
2422 * addrconf module should be notified of a device going up
2423 */
2424static struct notifier_block ipv6_dev_notf = {
2425 .notifier_call = addrconf_notify,
2426 .priority = 0
2427};
2428
2429static int addrconf_ifdown(struct net_device *dev, int how)
2430{
2431 struct inet6_dev *idev;
2432 struct inet6_ifaddr *ifa, **bifa;
2433 int i;
2434
2435 ASSERT_RTNL();
2436
2774c7ab 2437 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2438 how = 0;
2439
2440 rt6_ifdown(dev);
2441 neigh_ifdown(&nd_tbl, dev);
2442
2443 idev = __in6_dev_get(dev);
2444 if (idev == NULL)
2445 return -ENODEV;
2446
2447 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2448 Do not dev_put!
1da177e4
LT		 2449 */
2450 if (how == 1) {
1da177e4 2451 idev->dead = 1;
8814c4b5
YH		 2452
2453 /* protected by rtnl_lock */
2454 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2455
2456 /* Step 1.5: remove snmp6 entry */
2457 snmp6_unregister_dev(idev);
2458
2459 }
2460
2461 /* Step 2: clear hash table */
2462 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2463 bifa = &inet6_addr_lst[i];
2464
2465 write_lock_bh(&addrconf_hash_lock);
2466 while ((ifa = *bifa) != NULL) {
2467 if (ifa->idev == idev) {
2468 *bifa = ifa->lst_next;
2469 ifa->lst_next = NULL;
2470 addrconf_del_timer(ifa);
2471 in6_ifa_put(ifa);
2472 continue;
2473 }
2474 bifa = &ifa->lst_next;
2475 }
2476 write_unlock_bh(&addrconf_hash_lock);
2477 }
2478
2479 write_lock_bh(&idev->lock);
2480
2481 /* Step 3: clear flags for stateless addrconf */
2482 if (how != 1)
3c21edbd 2483 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2484
2485 /* Step 4: clear address list */
2486#ifdef CONFIG_IPV6_PRIVACY
2487 if (how == 1 && del_timer(&idev->regen_timer))
2488 in6_dev_put(idev);
2489
2490 /* clear tempaddr list */
2491 while ((ifa = idev->tempaddr_list) != NULL) {
2492 idev->tempaddr_list = ifa->tmp_next;
2493 ifa->tmp_next = NULL;
2494 ifa->dead = 1;
2495 write_unlock_bh(&idev->lock);
2496 spin_lock_bh(&ifa->lock);
2497
2498 if (ifa->ifpub) {
2499 in6_ifa_put(ifa->ifpub);
2500 ifa->ifpub = NULL;
2501 }
2502 spin_unlock_bh(&ifa->lock);
2503 in6_ifa_put(ifa);
2504 write_lock_bh(&idev->lock);
2505 }
2506#endif
2507 while ((ifa = idev->addr_list) != NULL) {
2508 idev->addr_list = ifa->if_next;
2509 ifa->if_next = NULL;
2510 ifa->dead = 1;
2511 addrconf_del_timer(ifa);
2512 write_unlock_bh(&idev->lock);
2513
2514 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2515 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2516 in6_ifa_put(ifa);
2517
2518 write_lock_bh(&idev->lock);
2519 }
2520 write_unlock_bh(&idev->lock);
2521
2522 /* Step 5: Discard multicast list */
2523
2524 if (how == 1)
2525 ipv6_mc_destroy_dev(idev);
2526 else
2527 ipv6_mc_down(idev);
2528
1da177e4 2529 idev->tstamp = jiffies;
1ab1457c 2530
1da177e4
LT		 2531 /* Shot the device (if unregistered) */
2532
2533 if (how == 1) {
408c4768 2534 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2535 neigh_parms_release(&nd_tbl, idev->nd_parms);
2536 neigh_ifdown(&nd_tbl, dev);
2537 in6_dev_put(idev);
2538 }
2539 return 0;
2540}
2541
2542static void addrconf_rs_timer(unsigned long data)
2543{
2544 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2545
2546 if (ifp->idev->cnf.forwarding)
2547 goto out;
2548
2549 if (ifp->idev->if_flags & IF_RA_RCVD) {
2550 /*
2551 * Announcement received after solicitation
2552 * was sent
2553 */
2554 goto out;
2555 }
2556
2557 spin_lock(&ifp->lock);
2558 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2559 struct in6_addr all_routers;
2560
2561 /* The wait after the last probe can be shorter */
2562 addrconf_mod_timer(ifp, AC_RS,
2563 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2564 ifp->idev->cnf.rtr_solicit_delay :
2565 ifp->idev->cnf.rtr_solicit_interval);
2566 spin_unlock(&ifp->lock);
2567
2568 ipv6_addr_all_routers(&all_routers);
2569
2570 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2571 } else {
2572 spin_unlock(&ifp->lock);
2573 /*
2574 * Note: we do not support deprecated "all on-link"
2575 * assumption any longer.
2576 */
2577 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2578 ifp->idev->dev->name);
2579 }
2580
2581out:
2582 in6_ifa_put(ifp);
2583}
2584
2585/*
2586 * Duplicate Address Detection
2587 */
3c21edbd
YH		 2588static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2589{
2590 unsigned long rand_num;
2591 struct inet6_dev *idev = ifp->idev;
2592
95c385b4
NH		 2593 if (ifp->flags & IFA_F_OPTIMISTIC)
2594 rand_num = 0;
2595 else
2596 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2597
3c21edbd
YH		 2598 ifp->probes = idev->cnf.dad_transmits;
2599 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2600}
2601
e431b8c0 2602static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2603{
2604 struct inet6_dev *idev = ifp->idev;
2605 struct net_device *dev = idev->dev;
1da177e4
LT		 2606
2607 addrconf_join_solict(dev, &ifp->addr);
2608
1da177e4 2609 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2610
2611 read_lock_bh(&idev->lock);
2612 if (ifp->dead)
2613 goto out;
2614 spin_lock_bh(&ifp->lock);
2615
2616 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2617 !(ifp->flags&IFA_F_TENTATIVE) ||
2618 ifp->flags & IFA_F_NODAD) {
95c385b4 2619 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2620 spin_unlock_bh(&ifp->lock);
2621 read_unlock_bh(&idev->lock);
2622
2623 addrconf_dad_completed(ifp);
2624 return;
2625 }
2626
6732bade 2627 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2628 spin_unlock_bh(&ifp->lock);
6732bade 2629 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2630 /*
2631 * If the defice is not ready:
2632 * - keep it tentative if it is a permanent address.
2633 * - otherwise, kill it.
2634 */
2635 in6_ifa_hold(ifp);
2636 addrconf_dad_stop(ifp);
6732bade 2637 return;
3c21edbd 2638 }
95c385b4
NH		 2639
2640 /*
2641 * Optimistic nodes can start receiving
2642 * Frames right away
2643 */
2644 if(ifp->flags & IFA_F_OPTIMISTIC)
2645 ip6_ins_rt(ifp->rt);
2646
6732bade
YH		 2647 addrconf_dad_kick(ifp);
2648 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2649out:
2650 read_unlock_bh(&idev->lock);
2651}
2652
2653static void addrconf_dad_timer(unsigned long data)
2654{
2655 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2656 struct inet6_dev *idev = ifp->idev;
2657 struct in6_addr unspec;
2658 struct in6_addr mcaddr;
2659
2660 read_lock_bh(&idev->lock);
2661 if (idev->dead) {
2662 read_unlock_bh(&idev->lock);
2663 goto out;
2664 }
2665 spin_lock_bh(&ifp->lock);
2666 if (ifp->probes == 0) {
2667 /*
2668 * DAD was successful
2669 */
2670
95c385b4 2671 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2672 spin_unlock_bh(&ifp->lock);
2673 read_unlock_bh(&idev->lock);
2674
2675 addrconf_dad_completed(ifp);
2676
2677 goto out;
2678 }
2679
2680 ifp->probes--;
2681 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2682 spin_unlock_bh(&ifp->lock);
2683 read_unlock_bh(&idev->lock);
2684
2685 /* send a neighbour solicitation for our addr */
2686 memset(&unspec, 0, sizeof(unspec));
2687 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2688 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2689out:
2690 in6_ifa_put(ifp);
2691}
2692
2693static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2694{
2695 struct net_device * dev = ifp->idev->dev;
2696
2697 /*
2698 * Configure the address for reception. Now it is valid.
2699 */
2700
2701 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2702
2703 /* If added prefix is link local and forwarding is off,
2704 start sending router solicitations.
2705 */
2706
2707 if (ifp->idev->cnf.forwarding == 0 &&
2708 ifp->idev->cnf.rtr_solicits > 0 &&
2709 (dev->flags&IFF_LOOPBACK) == 0 &&
2710 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2711 struct in6_addr all_routers;
2712
2713 ipv6_addr_all_routers(&all_routers);
2714
2715 /*
2716 * If a host as already performed a random delay
2717 * [...] as part of DAD [...] there is no need
2718 * to delay again before sending the first RS
2719 */
2720 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2721
2722 spin_lock_bh(&ifp->lock);
2723 ifp->probes = 1;
2724 ifp->idev->if_flags |= IF_RS_SENT;
2725 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2726 spin_unlock_bh(&ifp->lock);
2727 }
2728}
2729
c5e33bdd
YH		 2730static void addrconf_dad_run(struct inet6_dev *idev) {
2731 struct inet6_ifaddr *ifp;
2732
2733 read_lock_bh(&idev->lock);
2734 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2735 spin_lock_bh(&ifp->lock);
2736 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2737 spin_unlock_bh(&ifp->lock);
2738 continue;
2739 }
2740 spin_unlock_bh(&ifp->lock);
2741 addrconf_dad_kick(ifp);
2742 }
2743 read_unlock_bh(&idev->lock);
2744}
2745
1da177e4
LT		 2746#ifdef CONFIG_PROC_FS
2747struct if6_iter_state {
3c40090a 2748 struct seq_net_private p;
1da177e4
LT		 2749 int bucket;
2750};
2751
2752static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2753{
2754 struct inet6_ifaddr *ifa = NULL;
2755 struct if6_iter_state *state = seq->private;
3c40090a 2756 struct net *net = state->p.net;
1da177e4
LT		 2757
2758 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2759 ifa = inet6_addr_lst[state->bucket];
3c40090a
DL		 2760
2761 while (ifa && ifa->idev->dev->nd_net != net)
2762 ifa = ifa->lst_next;
1da177e4
LT		 2763 if (ifa)
2764 break;
2765 }
2766 return ifa;
2767}
2768
2769static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2770{
2771 struct if6_iter_state *state = seq->private;
3c40090a 2772 struct net *net = state->p.net;
1da177e4
LT		 2773
2774 ifa = ifa->lst_next;
2775try_again:
3c40090a
DL		 2776 if (ifa) {
2777 if (ifa->idev->dev->nd_net != net) {
2778 ifa = ifa->lst_next;
2779 goto try_again;
2780 }
2781 }
2782
1da177e4
LT		 2783 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2784 ifa = inet6_addr_lst[state->bucket];
2785 goto try_again;
2786 }
3c40090a 2787
1da177e4
LT		 2788 return ifa;
2789}
2790
2791static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2792{
2793 struct inet6_ifaddr *ifa = if6_get_first(seq);
2794
2795 if (ifa)
2796 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2797 --pos;
2798 return pos ? NULL : ifa;
2799}
2800
2801static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2802{
2803 read_lock_bh(&addrconf_hash_lock);
2804 return if6_get_idx(seq, *pos);
2805}
2806
2807static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2808{
2809 struct inet6_ifaddr *ifa;
2810
2811 ifa = if6_get_next(seq, v);
2812 ++*pos;
2813 return ifa;
2814}
2815
2816static void if6_seq_stop(struct seq_file *seq, void *v)
2817{
2818 read_unlock_bh(&addrconf_hash_lock);
2819}
2820
2821static int if6_seq_show(struct seq_file *seq, void *v)
2822{
2823 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2824 seq_printf(seq,
9343e79a 2825 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2826 NIP6(ifp->addr),
2827 ifp->idev->dev->ifindex,
2828 ifp->prefix_len,
2829 ifp->scope,
2830 ifp->flags,
2831 ifp->idev->dev->name);
2832 return 0;
2833}
2834
56b3d975 2835static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2836 .start = if6_seq_start,
2837 .next = if6_seq_next,
2838 .show = if6_seq_show,
2839 .stop = if6_seq_stop,
2840};
2841
2842static int if6_seq_open(struct inode *inode, struct file *file)
2843{
3c40090a
DL		 2844 return seq_open_net(inode, file, &if6_seq_ops,
2845 sizeof(struct if6_iter_state));
1da177e4
LT		 2846}
2847
9a32144e 2848static const struct file_operations if6_fops = {
1da177e4
LT		 2849 .owner = THIS_MODULE,
2850 .open = if6_seq_open,
2851 .read = seq_read,
2852 .llseek = seq_lseek,
3c40090a 2853 .release = seq_release_net,
1da177e4
LT		 2854};
2855
3c40090a 2856static int if6_proc_net_init(struct net *net)
1da177e4 2857{
3c40090a 2858 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2859 return -ENOMEM;
2860 return 0;
2861}
2862
3c40090a
DL		 2863static void if6_proc_net_exit(struct net *net)
2864{
2865 proc_net_remove(net, "if_inet6");
2866}
2867
2868static struct pernet_operations if6_proc_net_ops = {
2869 .init = if6_proc_net_init,
2870 .exit = if6_proc_net_exit,
2871};
2872
2873int __init if6_proc_init(void)
2874{
2875 return register_pernet_subsys(&if6_proc_net_ops);
2876}
2877
1da177e4
LT		 2878void if6_proc_exit(void)
2879{
3c40090a 2880 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2881}
2882#endif /* CONFIG_PROC_FS */
2883
59fbb3a6 2884#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2885/* Check if address is a home address configured on any interface. */
2886int ipv6_chk_home_addr(struct in6_addr *addr)
2887{
2888 int ret = 0;
2889 struct inet6_ifaddr * ifp;
2890 u8 hash = ipv6_addr_hash(addr);
2891 read_lock_bh(&addrconf_hash_lock);
2892 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2893 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2894 (ifp->flags & IFA_F_HOMEADDRESS)) {
2895 ret = 1;
2896 break;
2897 }
2898 }
2899 read_unlock_bh(&addrconf_hash_lock);
2900 return ret;
2901}
2902#endif
2903
1da177e4
LT		 2904/*
2905 * Periodic address status verification
2906 */
2907
2908static void addrconf_verify(unsigned long foo)
2909{
2910 struct inet6_ifaddr *ifp;
2911 unsigned long now, next;
2912 int i;
2913
2914 spin_lock_bh(&addrconf_verify_lock);
2915 now = jiffies;
2916 next = now + ADDR_CHECK_FREQUENCY;
2917
2918 del_timer(&addr_chk_timer);
2919
2920 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2921
2922restart:
5d5780df 2923 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2924 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2925 unsigned long age;
2926#ifdef CONFIG_IPV6_PRIVACY
2927 unsigned long regen_advance;
2928#endif
2929
2930 if (ifp->flags & IFA_F_PERMANENT)
2931 continue;
2932
2933 spin_lock(&ifp->lock);
2934 age = (now - ifp->tstamp) / HZ;
2935
2936#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2937 regen_advance = ifp->idev->cnf.regen_max_retry *
2938 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2939 ifp->idev->nd_parms->retrans_time / HZ;
2940#endif
2941
8f27ebb9
YH		 2942 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2943 age >= ifp->valid_lft) {
1da177e4
LT		 2944 spin_unlock(&ifp->lock);
2945 in6_ifa_hold(ifp);
5d5780df 2946 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2947 ipv6_del_addr(ifp);
2948 goto restart;
8f27ebb9
YH		 2949 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2950 spin_unlock(&ifp->lock);
2951 continue;
1da177e4
LT		 2952 } else if (age >= ifp->prefered_lft) {
2953 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2954 int deprecate = 0;
2955
2956 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2957 deprecate = 1;
2958 ifp->flags |= IFA_F_DEPRECATED;
2959 }
2960
2961 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2962 next = ifp->tstamp + ifp->valid_lft * HZ;
2963
2964 spin_unlock(&ifp->lock);
2965
2966 if (deprecate) {
2967 in6_ifa_hold(ifp);
5d5780df 2968 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2969
2970 ipv6_ifa_notify(0, ifp);
2971 in6_ifa_put(ifp);
2972 goto restart;
2973 }
2974#ifdef CONFIG_IPV6_PRIVACY
2975 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2976 !(ifp->flags&IFA_F_TENTATIVE)) {
2977 if (age >= ifp->prefered_lft - regen_advance) {
2978 struct inet6_ifaddr *ifpub = ifp->ifpub;
2979 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2980 next = ifp->tstamp + ifp->prefered_lft * HZ;
2981 if (!ifp->regen_count && ifpub) {
2982 ifp->regen_count++;
2983 in6_ifa_hold(ifp);
2984 in6_ifa_hold(ifpub);
2985 spin_unlock(&ifp->lock);
5d5780df 2986 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2987 spin_lock(&ifpub->lock);
2988 ifpub->regen_count = 0;
2989 spin_unlock(&ifpub->lock);
1da177e4
LT		 2990 ipv6_create_tempaddr(ifpub, ifp);
2991 in6_ifa_put(ifpub);
2992 in6_ifa_put(ifp);
2993 goto restart;
2994 }
2995 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2996 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2997 spin_unlock(&ifp->lock);
2998#endif
2999 } else {
3000 /* ifp->prefered_lft <= ifp->valid_lft */
3001 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3002 next = ifp->tstamp + ifp->prefered_lft * HZ;
3003 spin_unlock(&ifp->lock);
3004 }
3005 }
5d5780df 3006 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3007 }
3008
3009 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3010 add_timer(&addr_chk_timer);
3011 spin_unlock_bh(&addrconf_verify_lock);
3012}
3013
461d8837
TG		 3014static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3015{
3016 struct in6_addr *pfx = NULL;
3017
3018 if (addr)
3019 pfx = nla_data(addr);
3020
3021 if (local) {
3022 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3023 pfx = NULL;
3024 else
3025 pfx = nla_data(local);
3026 }
3027
3028 return pfx;
3029}
3030
ef7c79ed 3031static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3032 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3033 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3034 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3035};
3036
1da177e4
LT		 3037static int
3038inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3039{
b854272b 3040 struct net *net = skb->sk->sk_net;
b933f716
TG		 3041 struct ifaddrmsg *ifm;
3042 struct nlattr *tb[IFA_MAX+1];
1da177e4 3043 struct in6_addr *pfx;
b933f716 3044 int err;
1da177e4 3045
b854272b
DL		 3046 if (net != &init_net)
3047 return -EINVAL;
3048
b933f716
TG		 3049 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3050 if (err < 0)
3051 return err;
3052
3053 ifm = nlmsg_data(nlh);
3054 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3055 if (pfx == NULL)
3056 return -EINVAL;
3057
3058 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3059}
3060
55ebaef1
NT		 3061static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3062 u32 prefered_lft, u32 valid_lft)
081bba5b 3063{
46d48046
YH		 3064 u32 flags = RTF_EXPIRES;
3065
081bba5b
NT		 3066 if (!valid_lft || (prefered_lft > valid_lft))
3067 return -EINVAL;
3068
46d48046 3069 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3070 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3071 flags = 0;
3072 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3073 valid_lft = 0x7FFFFFFF/HZ;
3074
3075 if (prefered_lft == 0)
55ebaef1 3076 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3077 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3078 (prefered_lft != INFINITY_LIFE_TIME))
3079 prefered_lft = 0x7FFFFFFF/HZ;
3080
3081 spin_lock_bh(&ifp->lock);
3b9f9a1c 3082 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3083 ifp->tstamp = jiffies;
3084 ifp->valid_lft = valid_lft;
3085 ifp->prefered_lft = prefered_lft;
3086
3087 spin_unlock_bh(&ifp->lock);
3088 if (!(ifp->flags&IFA_F_TENTATIVE))
3089 ipv6_ifa_notify(0, ifp);
081bba5b 3090
46d48046
YH		 3091 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3092 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3093 addrconf_verify(0);
3094
3095 return 0;
3096}
3097
1da177e4
LT		 3098static int
3099inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3100{
b854272b 3101 struct net *net = skb->sk->sk_net;
461d8837
TG		 3102 struct ifaddrmsg *ifm;
3103 struct nlattr *tb[IFA_MAX+1];
1da177e4 3104 struct in6_addr *pfx;
7198f8ce
TG		 3105 struct inet6_ifaddr *ifa;
3106 struct net_device *dev;
55ebaef1
NT		 3107 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3108 u8 ifa_flags;
461d8837 3109 int err;
1da177e4 3110
b854272b
DL		 3111 if (net != &init_net)
3112 return -EINVAL;
3113
461d8837
TG		 3114 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3115 if (err < 0)
3116 return err;
3117
3118 ifm = nlmsg_data(nlh);
3119 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3120 if (pfx == NULL)
3121 return -EINVAL;
3122
461d8837 3123 if (tb[IFA_CACHEINFO]) {
0778769d 3124 struct ifa_cacheinfo *ci;
461d8837
TG		 3125
3126 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3127 valid_lft = ci->ifa_valid;
461d8837
TG		 3128 preferred_lft = ci->ifa_prefered;
3129 } else {
3130 preferred_lft = INFINITY_LIFE_TIME;
3131 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3132 }
3133
881d966b 3134 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3135 if (dev == NULL)
3136 return -ENODEV;
3137
55ebaef1 3138 /* We ignore other flags so far. */
3b9f9a1c 3139 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3140
1cab3da6 3141 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3142 if (ifa == NULL) {
3143 /*
3144 * It would be best to check for !NLM_F_CREATE here but
3145 * userspace alreay relies on not having to provide this.
3146 */
3147 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3148 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3149 }
3150
7198f8ce
TG		 3151 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3152 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3153 err = -EEXIST;
3154 else
55ebaef1 3155 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3156
3157 in6_ifa_put(ifa);
3158
3159 return err;
1da177e4
LT		 3160}
3161
101bb229
TG		 3162static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3163 u8 scope, int ifindex)
3164{
3165 struct ifaddrmsg *ifm;
3166
3167 ifm = nlmsg_data(nlh);
3168 ifm->ifa_family = AF_INET6;
3169 ifm->ifa_prefixlen = prefixlen;
3170 ifm->ifa_flags = flags;
3171 ifm->ifa_scope = scope;
3172 ifm->ifa_index = ifindex;
3173}
3174
85486af0
TG		 3175static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3176 unsigned long tstamp, u32 preferred, u32 valid)
3177{
3178 struct ifa_cacheinfo ci;
3179
3180 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3181 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3182 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3183 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3184 ci.ifa_prefered = preferred;
3185 ci.ifa_valid = valid;
3186
3187 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3188}
3189
101bb229
TG		 3190static inline int rt_scope(int ifa_scope)
3191{
3192 if (ifa_scope & IFA_HOST)
3193 return RT_SCOPE_HOST;
3194 else if (ifa_scope & IFA_LINK)
3195 return RT_SCOPE_LINK;
3196 else if (ifa_scope & IFA_SITE)
3197 return RT_SCOPE_SITE;
3198 else
3199 return RT_SCOPE_UNIVERSE;
3200}
3201
0ab6803b
TG		 3202static inline int inet6_ifaddr_msgsize(void)
3203{
339bf98f
TG		 3204 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3205 + nla_total_size(16) /* IFA_ADDRESS */
3206 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3207}
c5396a31 3208
1da177e4 3209static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3210 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3211{
1da177e4 3212 struct nlmsghdr *nlh;
85486af0 3213 u32 preferred, valid;
1da177e4 3214
0ab6803b
TG		 3215 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3216 if (nlh == NULL)
26932566 3217 return -EMSGSIZE;
0ab6803b 3218
101bb229
TG		 3219 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3220 ifa->idev->dev->ifindex);
3221
1da177e4 3222 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3223 preferred = ifa->prefered_lft;
3224 valid = ifa->valid_lft;
3225 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3226 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3227 preferred -= tval;
3228 if (valid != INFINITY_LIFE_TIME)
3229 valid -= tval;
1da177e4
LT		 3230 }
3231 } else {
85486af0
TG		 3232 preferred = INFINITY_LIFE_TIME;
3233 valid = INFINITY_LIFE_TIME;
3234 }
3235
0ab6803b 3236 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3237 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3238 nlmsg_cancel(skb, nlh);
3239 return -EMSGSIZE;
3240 }
1da177e4 3241
0ab6803b 3242 return nlmsg_end(skb, nlh);
1da177e4
LT		 3243}
3244
3245static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3246 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3247{
1da177e4 3248 struct nlmsghdr *nlh;
101bb229
TG		 3249 u8 scope = RT_SCOPE_UNIVERSE;
3250 int ifindex = ifmca->idev->dev->ifindex;
3251
3252 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3253 scope = RT_SCOPE_SITE;
1da177e4 3254
0ab6803b
TG		 3255 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3256 if (nlh == NULL)
26932566 3257 return -EMSGSIZE;
85486af0 3258
0ab6803b
TG		 3259 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3260 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3261 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3262 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3263 nlmsg_cancel(skb, nlh);
3264 return -EMSGSIZE;
3265 }
85486af0 3266
0ab6803b 3267 return nlmsg_end(skb, nlh);
1da177e4
LT		 3268}
3269
3270static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3271 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3272{
1da177e4 3273 struct nlmsghdr *nlh;
101bb229
TG		 3274 u8 scope = RT_SCOPE_UNIVERSE;
3275 int ifindex = ifaca->aca_idev->dev->ifindex;
3276
3277 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3278 scope = RT_SCOPE_SITE;
1da177e4 3279
0ab6803b
TG		 3280 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3281 if (nlh == NULL)
26932566 3282 return -EMSGSIZE;
85486af0 3283
0ab6803b
TG		 3284 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3285 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3286 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3287 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3288 nlmsg_cancel(skb, nlh);
3289 return -EMSGSIZE;
3290 }
1da177e4 3291
0ab6803b 3292 return nlmsg_end(skb, nlh);
1da177e4
LT		 3293}
3294
3295enum addr_type_t
3296{
3297 UNICAST_ADDR,
3298 MULTICAST_ADDR,
3299 ANYCAST_ADDR,
3300};
3301
3302static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3303 enum addr_type_t type)
3304{
3305 int idx, ip_idx;
3306 int s_idx, s_ip_idx;
3307 int err = 1;
3308 struct net_device *dev;
3309 struct inet6_dev *idev = NULL;
3310 struct inet6_ifaddr *ifa;
3311 struct ifmcaddr6 *ifmca;
3312 struct ifacaddr6 *ifaca;
3313
3314 s_idx = cb->args[0];
3315 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3316
7562f876 3317 idx = 0;
881d966b 3318 for_each_netdev(&init_net, dev) {
1da177e4 3319 if (idx < s_idx)
7562f876 3320 goto cont;
1da177e4
LT		 3321 if (idx > s_idx)
3322 s_ip_idx = 0;
3323 ip_idx = 0;
3324 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3325 goto cont;
1da177e4
LT		 3326 read_lock_bh(&idev->lock);
3327 switch (type) {
3328 case UNICAST_ADDR:
ae9cda5d 3329 /* unicast address incl. temp addr */
1da177e4
LT		 3330 for (ifa = idev->addr_list; ifa;
3331 ifa = ifa->if_next, ip_idx++) {
3332 if (ip_idx < s_ip_idx)
3333 continue;
1ab1457c
YH		 3334 if ((err = inet6_fill_ifaddr(skb, ifa,
3335 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3336 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3337 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3338 goto done;
3339 }
1da177e4
LT		 3340 break;
3341 case MULTICAST_ADDR:
3342 /* multicast address */
1ab1457c 3343 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3344 ifmca = ifmca->next, ip_idx++) {
3345 if (ip_idx < s_ip_idx)
3346 continue;
1ab1457c
YH		 3347 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3348 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3349 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3350 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3351 goto done;
3352 }
3353 break;
3354 case ANYCAST_ADDR:
3355 /* anycast address */
3356 for (ifaca = idev->ac_list; ifaca;
3357 ifaca = ifaca->aca_next, ip_idx++) {
3358 if (ip_idx < s_ip_idx)
3359 continue;
1ab1457c
YH		 3360 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3361 NETLINK_CB(cb->skb).pid,
b6544c0b 3362 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3363 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3364 goto done;
3365 }
3366 break;
3367 default:
3368 break;
3369 }
3370 read_unlock_bh(&idev->lock);
3371 in6_dev_put(idev);
7562f876
PE		 3372cont:
3373 idx++;
1da177e4
LT		 3374 }
3375done:
3376 if (err <= 0) {
3377 read_unlock_bh(&idev->lock);
3378 in6_dev_put(idev);
3379 }
1da177e4
LT		 3380 cb->args[0] = idx;
3381 cb->args[1] = ip_idx;
3382 return skb->len;
3383}
3384
3385static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3386{
b854272b 3387 struct net *net = skb->sk->sk_net;
1da177e4 3388 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3389
3390 if (net != &init_net)
3391 return 0;
3392
1da177e4
LT		 3393 return inet6_dump_addr(skb, cb, type);
3394}
3395
3396static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3397{
b854272b 3398 struct net *net = skb->sk->sk_net;
1da177e4 3399 enum addr_type_t type = MULTICAST_ADDR;
b854272b
DL		 3400
3401 if (net != &init_net)
3402 return 0;
3403
1da177e4
LT		 3404 return inet6_dump_addr(skb, cb, type);
3405}
3406
3407
3408static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3409{
b854272b 3410 struct net *net = skb->sk->sk_net;
1da177e4 3411 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3412
3413 if (net != &init_net)
3414 return 0;
3415
1da177e4
LT		 3416 return inet6_dump_addr(skb, cb, type);
3417}
3418
1b29fc2c
TG		 3419static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3420 void *arg)
6c223828 3421{
b854272b 3422 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3423 struct ifaddrmsg *ifm;
3424 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3425 struct in6_addr *addr = NULL;
3426 struct net_device *dev = NULL;
3427 struct inet6_ifaddr *ifa;
3428 struct sk_buff *skb;
6c223828
NT		 3429 int err;
3430
b854272b
DL		 3431 if (net != &init_net)
3432 return -EINVAL;
3433
1b29fc2c
TG		 3434 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3435 if (err < 0)
3436 goto errout;
3437
3438 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3439 if (addr == NULL) {
3440 err = -EINVAL;
3441 goto errout;
6c223828 3442 }
6c223828 3443
1b29fc2c 3444 ifm = nlmsg_data(nlh);
6c223828 3445 if (ifm->ifa_index)
881d966b 3446 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3447
1cab3da6 3448 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3449 err = -EADDRNOTAVAIL;
3450 goto errout;
3451 }
6c223828 3452
0ab6803b 3453 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3454 err = -ENOBUFS;
1b29fc2c 3455 goto errout_ifa;
6c223828
NT		 3456 }
3457
6c223828
NT		 3458 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3459 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3460 if (err < 0) {
3461 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3462 WARN_ON(err == -EMSGSIZE);
3463 kfree_skb(skb);
3464 goto errout_ifa;
3465 }
97c53cac 3466 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3467errout_ifa:
6c223828 3468 in6_ifa_put(ifa);
1b29fc2c 3469errout:
6c223828 3470 return err;
6c223828
NT		 3471}
3472
1da177e4
LT		 3473static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3474{
3475 struct sk_buff *skb;
5d620266 3476 int err = -ENOBUFS;
1da177e4 3477
0ab6803b 3478 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3479 if (skb == NULL)
3480 goto errout;
3481
3482 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3483 if (err < 0) {
3484 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3485 WARN_ON(err == -EMSGSIZE);
3486 kfree_skb(skb);
3487 goto errout;
3488 }
97c53cac 3489 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3490errout:
3491 if (err < 0)
97c53cac 3492 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3493}
3494
b6f99a21 3495static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3496 __s32 *array, int bytes)
3497{
04561c1f
TG		 3498 BUG_ON(bytes < (DEVCONF_MAX * 4));
3499
1da177e4
LT		 3500 memset(array, 0, bytes);
3501 array[DEVCONF_FORWARDING] = cnf->forwarding;
3502 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3503 array[DEVCONF_MTU6] = cnf->mtu6;
3504 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3505 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3506 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3507 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3508 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3509 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3510 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3511 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3512#ifdef CONFIG_IPV6_PRIVACY
3513 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3514 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3515 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3516 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3517 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3518#endif
3519 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3520 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3521 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3522#ifdef CONFIG_IPV6_ROUTER_PREF
3523 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3524 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3525#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3526 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3527#endif
930d6ff2 3528#endif
fbea49e1 3529 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3530 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3531#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3532 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3533#endif
1da177e4
LT		 3534}
3535
339bf98f
TG		 3536static inline size_t inet6_if_nlmsg_size(void)
3537{
3538 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3539 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3540 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3541 + nla_total_size(4) /* IFLA_MTU */
3542 + nla_total_size(4) /* IFLA_LINK */
3543 + nla_total_size( /* IFLA_PROTINFO */
3544 nla_total_size(4) /* IFLA_INET6_FLAGS */
3545 + nla_total_size(sizeof(struct ifla_cacheinfo))
3546 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3547 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3548 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3549 );
3550}
c5396a31 3551
7f7d9a6b
HX		 3552static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3553 int bytes)
3554{
3555 int i;
3556 int pad = bytes - sizeof(u64) * items;
3557 BUG_ON(pad < 0);
3558
3559 /* Use put_unaligned() because stats may not be aligned for u64. */
3560 put_unaligned(items, &stats[0]);
3561 for (i = 1; i < items; i++)
3562 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3563
3564 memset(&stats[items], 0, pad);
3565}
3566
3567static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3568 int bytes)
3569{
3570 switch(attrtype) {
3571 case IFLA_INET6_STATS:
3572 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3573 break;
3574 case IFLA_INET6_ICMP6STATS:
3575 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3576 break;
3577 }
3578}
3579
1ab1457c 3580static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3581 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3582{
04561c1f 3583 struct net_device *dev = idev->dev;
bf99f1bd 3584 struct nlattr *nla;
04561c1f
TG		 3585 struct ifinfomsg *hdr;
3586 struct nlmsghdr *nlh;
3587 void *protoinfo;
3588 struct ifla_cacheinfo ci;
3589
3590 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3591 if (nlh == NULL)
26932566 3592 return -EMSGSIZE;
04561c1f
TG		 3593
3594 hdr = nlmsg_data(nlh);
3595 hdr->ifi_family = AF_INET6;
3596 hdr->__ifi_pad = 0;
3597 hdr->ifi_type = dev->type;
3598 hdr->ifi_index = dev->ifindex;
3599 hdr->ifi_flags = dev_get_flags(dev);
3600 hdr->ifi_change = 0;
3601
3602 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3603
3604 if (dev->addr_len)
04561c1f 3605 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3606
04561c1f 3607 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3608 if (dev->ifindex != dev->iflink)
04561c1f 3609 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3610
04561c1f
TG		 3611 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3612 if (protoinfo == NULL)
3613 goto nla_put_failure;
1da177e4 3614
04561c1f 3615 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3616
1da177e4
LT		 3617 ci.max_reasm_len = IPV6_MAXPLEN;
3618 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3619 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3620 ci.reachable_time = idev->nd_parms->reachable_time;
3621 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3622 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3623
bf99f1bd
YH		 3624 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3625 if (nla == NULL)
04561c1f 3626 goto nla_put_failure;
bf99f1bd 3627 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3628
bf99f1bd
YH		 3629 /* XXX - MC not implemented */
3630
3631 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3632 if (nla == NULL)
3633 goto nla_put_failure;
3634 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3635
3636 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3637 if (nla == NULL)
3638 goto nla_put_failure;
3639 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3640
04561c1f
TG		 3641 nla_nest_end(skb, protoinfo);
3642 return nlmsg_end(skb, nlh);
1da177e4 3643
04561c1f 3644nla_put_failure:
26932566
PM		 3645 nlmsg_cancel(skb, nlh);
3646 return -EMSGSIZE;
1da177e4
LT		 3647}
3648
3649static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3650{
b854272b 3651 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3652 int idx, err;
3653 int s_idx = cb->args[0];
3654 struct net_device *dev;
3655 struct inet6_dev *idev;
3656
b854272b
DL		 3657 if (net != &init_net)
3658 return 0;
3659
1da177e4 3660 read_lock(&dev_base_lock);
7562f876 3661 idx = 0;
881d966b 3662 for_each_netdev(&init_net, dev) {
1da177e4 3663 if (idx < s_idx)
7562f876 3664 goto cont;
1da177e4 3665 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3666 goto cont;
1ab1457c 3667 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3668 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3669 in6_dev_put(idev);
3670 if (err <= 0)
3671 break;
7562f876
PE		 3672cont:
3673 idx++;
1da177e4
LT		 3674 }
3675 read_unlock(&dev_base_lock);
3676 cb->args[0] = idx;
3677
3678 return skb->len;
3679}
3680
3681void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3682{
3683 struct sk_buff *skb;
8d7a76c9 3684 int err = -ENOBUFS;
1ab1457c 3685
339bf98f 3686 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3687 if (skb == NULL)
3688 goto errout;
3689
3690 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3691 if (err < 0) {
3692 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3693 WARN_ON(err == -EMSGSIZE);
3694 kfree_skb(skb);
3695 goto errout;
3696 }
97c53cac 3697 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3698errout:
3699 if (err < 0)
97c53cac 3700 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3701}
3702
339bf98f
TG		 3703static inline size_t inet6_prefix_nlmsg_size(void)
3704{
3705 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3706 + nla_total_size(sizeof(struct in6_addr))
3707 + nla_total_size(sizeof(struct prefix_cacheinfo));
3708}
c5396a31 3709
1da177e4 3710static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3711 struct prefix_info *pinfo, u32 pid, u32 seq,
3712 int event, unsigned int flags)
1da177e4 3713{
6051e2f4
TG		 3714 struct prefixmsg *pmsg;
3715 struct nlmsghdr *nlh;
1da177e4
LT		 3716 struct prefix_cacheinfo ci;
3717
6051e2f4
TG		 3718 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3719 if (nlh == NULL)
26932566 3720 return -EMSGSIZE;
6051e2f4
TG		 3721
3722 pmsg = nlmsg_data(nlh);
1da177e4 3723 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3724 pmsg->prefix_pad1 = 0;
3725 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3726 pmsg->prefix_ifindex = idev->dev->ifindex;
3727 pmsg->prefix_len = pinfo->prefix_len;
3728 pmsg->prefix_type = pinfo->type;
8a47077a 3729 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3730 pmsg->prefix_flags = 0;
3731 if (pinfo->onlink)
3732 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3733 if (pinfo->autoconf)
3734 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3735
6051e2f4 3736 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3737
3738 ci.preferred_time = ntohl(pinfo->prefered);
3739 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3740 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3741
6051e2f4 3742 return nlmsg_end(skb, nlh);
1da177e4 3743
6051e2f4 3744nla_put_failure:
26932566
PM		 3745 nlmsg_cancel(skb, nlh);
3746 return -EMSGSIZE;
1da177e4
LT		 3747}
3748
1ab1457c 3749static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3750 struct prefix_info *pinfo)
3751{
3752 struct sk_buff *skb;
8c384bfa 3753 int err = -ENOBUFS;
1da177e4 3754
339bf98f 3755 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3756 if (skb == NULL)
3757 goto errout;
3758
3759 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3760 if (err < 0) {
3761 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3762 WARN_ON(err == -EMSGSIZE);
3763 kfree_skb(skb);
3764 goto errout;
3765 }
97c53cac 3766 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3767errout:
3768 if (err < 0)
97c53cac 3769 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3770}
3771
1da177e4
LT		 3772static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3773{
3774 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3775
3776 switch (event) {
3777 case RTM_NEWADDR:
95c385b4
NH		 3778 /*
3779 * If the address was optimistic
3780 * we inserted the route at the start of
3781 * our DAD process, so we don't need
3782 * to do it again
3783 */
3784 if (!(ifp->rt->rt6i_node))
3785 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3786 if (ifp->idev->cnf.forwarding)
3787 addrconf_join_anycast(ifp);
3788 break;
3789 case RTM_DELADDR:
3790 if (ifp->idev->cnf.forwarding)
3791 addrconf_leave_anycast(ifp);
3792 addrconf_leave_solict(ifp->idev, &ifp->addr);
3793 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3794 if (ip6_del_rt(ifp->rt))
1da177e4 3795 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3796 break;
3797 }
3798}
3799
3800static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3801{
8814c4b5 3802 rcu_read_lock_bh();
1da177e4
LT		 3803 if (likely(ifp->idev->dead == 0))
3804 __ipv6_ifa_notify(event, ifp);
8814c4b5 3805 rcu_read_unlock_bh();
1da177e4
LT		 3806}
3807
3808#ifdef CONFIG_SYSCTL
3809
3810static
3811int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3812 void __user *buffer, size_t *lenp, loff_t *ppos)
3813{
3814 int *valp = ctl->data;
3815 int val = *valp;
3816 int ret;
3817
3818 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3819
c8fecf22
PE		 3820 if (write)
3821 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3822 return ret;
1da177e4
LT		 3823}
3824
1ab1457c 3825static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3826 int __user *name, int nlen,
3827 void __user *oldval,
3828 size_t __user *oldlenp,
1f29bcd7 3829 void __user *newval, size_t newlen)
1da177e4
LT		 3830{
3831 int *valp = table->data;
c8fecf22 3832 int val = *valp;
1da177e4
LT		 3833 int new;
3834
3835 if (!newval || !newlen)
3836 return 0;
3837 if (newlen != sizeof(int))
3838 return -EINVAL;
3839 if (get_user(new, (int __user *)newval))
3840 return -EFAULT;
3841 if (new == *valp)
3842 return 0;
3843 if (oldval && oldlenp) {
3844 size_t len;
3845 if (get_user(len, oldlenp))
3846 return -EFAULT;
3847 if (len) {
3848 if (len > table->maxlen)
3849 len = table->maxlen;
3850 if (copy_to_user(oldval, valp, len))
3851 return -EFAULT;
3852 if (put_user(len, oldlenp))
3853 return -EFAULT;
3854 }
3855 }
3856
c8fecf22
PE		 3857 *valp = new;
3858 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3859 return 1;
3860}
3861
3862static struct addrconf_sysctl_table
3863{
3864 struct ctl_table_header *sysctl_header;
3865 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3866 char *dev_name;
ab32ea5d 3867} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3868 .sysctl_header = NULL,
3869 .addrconf_vars = {
1ab1457c 3870 {
1da177e4
LT		 3871 .ctl_name = NET_IPV6_FORWARDING,
3872 .procname = "forwarding",
1ab1457c 3873 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3874 .maxlen = sizeof(int),
3875 .mode = 0644,
1ab1457c 3876 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3877 .strategy = &addrconf_sysctl_forward_strategy,
3878 },
3879 {
3880 .ctl_name = NET_IPV6_HOP_LIMIT,
3881 .procname = "hop_limit",
1ab1457c 3882 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3883 .maxlen = sizeof(int),
3884 .mode = 0644,
3885 .proc_handler = proc_dointvec,
3886 },
3887 {
3888 .ctl_name = NET_IPV6_MTU,
3889 .procname = "mtu",
3890 .data = &ipv6_devconf.mtu6,
1ab1457c 3891 .maxlen = sizeof(int),
1da177e4 3892 .mode = 0644,
1ab1457c 3893 .proc_handler = &proc_dointvec,
1da177e4
LT		 3894 },
3895 {
3896 .ctl_name = NET_IPV6_ACCEPT_RA,
3897 .procname = "accept_ra",
1ab1457c 3898 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3899 .maxlen = sizeof(int),
3900 .mode = 0644,
1ab1457c 3901 .proc_handler = &proc_dointvec,
1da177e4
LT		 3902 },
3903 {
3904 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3905 .procname = "accept_redirects",
1ab1457c 3906 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3907 .maxlen = sizeof(int),
3908 .mode = 0644,
1ab1457c 3909 .proc_handler = &proc_dointvec,
1da177e4
LT		 3910 },
3911 {
3912 .ctl_name = NET_IPV6_AUTOCONF,
3913 .procname = "autoconf",
1ab1457c 3914 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3915 .maxlen = sizeof(int),
3916 .mode = 0644,
1ab1457c 3917 .proc_handler = &proc_dointvec,
1da177e4
LT		 3918 },
3919 {
3920 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3921 .procname = "dad_transmits",
1ab1457c 3922 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3923 .maxlen = sizeof(int),
3924 .mode = 0644,
1ab1457c 3925 .proc_handler = &proc_dointvec,
1da177e4
LT		 3926 },
3927 {
3928 .ctl_name = NET_IPV6_RTR_SOLICITS,
3929 .procname = "router_solicitations",
1ab1457c 3930 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3931 .maxlen = sizeof(int),
3932 .mode = 0644,
1ab1457c 3933 .proc_handler = &proc_dointvec,
1da177e4
LT		 3934 },
3935 {
3936 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3937 .procname = "router_solicitation_interval",
1ab1457c 3938 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3939 .maxlen = sizeof(int),
3940 .mode = 0644,
1ab1457c 3941 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3942 .strategy = &sysctl_jiffies,
3943 },
3944 {
3945 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3946 .procname = "router_solicitation_delay",
1ab1457c 3947 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3948 .maxlen = sizeof(int),
3949 .mode = 0644,
1ab1457c 3950 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3951 .strategy = &sysctl_jiffies,
3952 },
3953 {
3954 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3955 .procname = "force_mld_version",
1ab1457c 3956 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3957 .maxlen = sizeof(int),
3958 .mode = 0644,
1ab1457c 3959 .proc_handler = &proc_dointvec,
1da177e4
LT		 3960 },
3961#ifdef CONFIG_IPV6_PRIVACY
3962 {
3963 .ctl_name = NET_IPV6_USE_TEMPADDR,
3964 .procname = "use_tempaddr",
1ab1457c 3965 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3966 .maxlen = sizeof(int),
3967 .mode = 0644,
1ab1457c 3968 .proc_handler = &proc_dointvec,
1da177e4
LT		 3969 },
3970 {
3971 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3972 .procname = "temp_valid_lft",
1ab1457c 3973 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3974 .maxlen = sizeof(int),
3975 .mode = 0644,
1ab1457c 3976 .proc_handler = &proc_dointvec,
1da177e4
LT		 3977 },
3978 {
3979 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3980 .procname = "temp_prefered_lft",
1ab1457c 3981 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3982 .maxlen = sizeof(int),
3983 .mode = 0644,
1ab1457c 3984 .proc_handler = &proc_dointvec,
1da177e4
LT		 3985 },
3986 {
3987 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3988 .procname = "regen_max_retry",
1ab1457c 3989 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3990 .maxlen = sizeof(int),
3991 .mode = 0644,
1ab1457c 3992 .proc_handler = &proc_dointvec,
1da177e4
LT		 3993 },
3994 {
3995 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3996 .procname = "max_desync_factor",
1ab1457c 3997 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3998 .maxlen = sizeof(int),
3999 .mode = 0644,
1ab1457c 4000 .proc_handler = &proc_dointvec,
1da177e4
LT		 4001 },
4002#endif
4003 {
4004 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4005 .procname = "max_addresses",
4006 .data = &ipv6_devconf.max_addresses,
4007 .maxlen = sizeof(int),
4008 .mode = 0644,
4009 .proc_handler = &proc_dointvec,
4010 },
65f5c7c1
YH		 4011 {
4012 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4013 .procname = "accept_ra_defrtr",
1ab1457c 4014 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4015 .maxlen = sizeof(int),
4016 .mode = 0644,
1ab1457c 4017 .proc_handler = &proc_dointvec,
65f5c7c1 4018 },
c4fd30eb
YH		 4019 {
4020 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4021 .procname = "accept_ra_pinfo",
1ab1457c 4022 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4023 .maxlen = sizeof(int),
4024 .mode = 0644,
1ab1457c 4025 .proc_handler = &proc_dointvec,
c4fd30eb 4026 },
930d6ff2
YH		 4027#ifdef CONFIG_IPV6_ROUTER_PREF
4028 {
4029 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4030 .procname = "accept_ra_rtr_pref",
4031 .data = &ipv6_devconf.accept_ra_rtr_pref,
4032 .maxlen = sizeof(int),
4033 .mode = 0644,
4034 .proc_handler = &proc_dointvec,
4035 },
52e16356
YH		 4036 {
4037 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4038 .procname = "router_probe_interval",
4039 .data = &ipv6_devconf.rtr_probe_interval,
4040 .maxlen = sizeof(int),
4041 .mode = 0644,
4042 .proc_handler = &proc_dointvec_jiffies,
4043 .strategy = &sysctl_jiffies,
4044 },
fa03ef38 4045#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4046 {
4047 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4048 .procname = "accept_ra_rt_info_max_plen",
4049 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4050 .maxlen = sizeof(int),
4051 .mode = 0644,
4052 .proc_handler = &proc_dointvec,
4053 },
4054#endif
930d6ff2 4055#endif
fbea49e1
YH		 4056 {
4057 .ctl_name = NET_IPV6_PROXY_NDP,
4058 .procname = "proxy_ndp",
4059 .data = &ipv6_devconf.proxy_ndp,
4060 .maxlen = sizeof(int),
4061 .mode = 0644,
4062 .proc_handler = &proc_dointvec,
4063 },
0bcbc926
YH		 4064 {
4065 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4066 .procname = "accept_source_route",
4067 .data = &ipv6_devconf.accept_source_route,
4068 .maxlen = sizeof(int),
4069 .mode = 0644,
4070 .proc_handler = &proc_dointvec,
4071 },
95c385b4
NH		 4072#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4073 {
4074 .ctl_name = CTL_UNNUMBERED,
4075 .procname = "optimistic_dad",
4076 .data = &ipv6_devconf.optimistic_dad,
4077 .maxlen = sizeof(int),
4078 .mode = 0644,
4079 .proc_handler = &proc_dointvec,
4080
4081 },
4082#endif
1da177e4
LT		 4083 {
4084 .ctl_name = 0, /* sentinel */
4085 }
4086 },
1da177e4
LT		 4087};
4088
bff16c2f
PE		 4089static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4090 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4091{
4092 int i;
1da177e4 4093 struct addrconf_sysctl_table *t;
1da177e4 4094
1dab6222
PE		 4095#define ADDRCONF_CTL_PATH_DEV 3
4096
4097 struct ctl_path addrconf_ctl_path[] = {
4098 { .procname = "net", .ctl_name = CTL_NET, },
4099 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4100 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4101 { /* to be set */ },
4102 { },
4103 };
4104
4105
af879cc7 4106 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4107 if (t == NULL)
f68635e6
PE		 4108 goto out;
4109
1da177e4
LT		 4110 for (i=0; t->addrconf_vars[i].data; i++) {
4111 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4112 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4113 t->addrconf_vars[i].extra2 = net;
1da177e4 4114 }
1da177e4 4115
1ab1457c
YH		 4116 /*
4117 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4118 * by sysctl and we wouldn't want anyone to change it under our feet
4119 * (see SIOCSIFNAME).
1ab1457c 4120 */
1dab6222
PE		 4121 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4122 if (!t->dev_name)
f68635e6 4123 goto free;
1da177e4 4124
1dab6222
PE		 4125 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4126 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4127
bff16c2f 4128 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4129 t->addrconf_vars);
1da177e4
LT		 4130 if (t->sysctl_header == NULL)
4131 goto free_procname;
f68635e6
PE		 4132
4133 p->sysctl = t;
95897312 4134 return 0;
1da177e4 4135
f68635e6 4136free_procname:
1dab6222 4137 kfree(t->dev_name);
f68635e6 4138free:
1da177e4 4139 kfree(t);
f68635e6 4140out:
95897312 4141 return -ENOBUFS;
1da177e4
LT		 4142}
4143
408c4768
PE		 4144static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4145{
4146 struct addrconf_sysctl_table *t;
4147
4148 if (p->sysctl == NULL)
4149 return;
4150
4151 t = p->sysctl;
4152 p->sysctl = NULL;
4153 unregister_sysctl_table(t->sysctl_header);
4154 kfree(t->dev_name);
4155 kfree(t);
4156}
4157
f52295a9
PE		 4158static void addrconf_sysctl_register(struct inet6_dev *idev)
4159{
408c4768
PE		 4160 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4161 NET_IPV6_NEIGH, "ipv6",
4162 &ndisc_ifinfo_sysctl_change,
4163 NULL);
bff16c2f
PE		 4164 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4165 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4166}
4167
408c4768 4168static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4169{
408c4768
PE		 4170 __addrconf_sysctl_unregister(&idev->cnf);
4171 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4172}
4173
4174
4175#endif
4176
e0da5a48
PE		 4177static int addrconf_init_net(struct net *net)
4178{
4179 int err;
4180 struct ipv6_devconf *all, *dflt;
4181
4182 err = -ENOMEM;
4183 all = &ipv6_devconf;
4184 dflt = &ipv6_devconf_dflt;
4185
4186 if (net != &init_net) {
4187 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4188 if (all == NULL)
4189 goto err_alloc_all;
4190
4191 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4192 if (dflt == NULL)
4193 goto err_alloc_dflt;
4194 }
4195
4196 net->ipv6.devconf_all = all;
4197 net->ipv6.devconf_dflt = dflt;
4198
4199#ifdef CONFIG_SYSCTL
4200 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4201 NULL, all);
4202 if (err < 0)
4203 goto err_reg_all;
4204
4205 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4206 NULL, dflt);
4207 if (err < 0)
4208 goto err_reg_dflt;
4209#endif
4210 return 0;
4211
4212#ifdef CONFIG_SYSCTL
4213err_reg_dflt:
4214 __addrconf_sysctl_unregister(all);
4215err_reg_all:
4216 kfree(dflt);
4217#endif
4218err_alloc_dflt:
4219 kfree(all);
4220err_alloc_all:
4221 return err;
4222}
4223
4224static void addrconf_exit_net(struct net *net)
4225{
4226#ifdef CONFIG_SYSCTL
4227 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4228 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4229#endif
4230 if (net != &init_net) {
4231 kfree(net->ipv6.devconf_dflt);
4232 kfree(net->ipv6.devconf_all);
4233 }
4234}
4235
4236static struct pernet_operations addrconf_ops = {
4237 .init = addrconf_init_net,
4238 .exit = addrconf_exit_net,
4239};
4240
1da177e4
LT		 4241/*
4242 * Device notifier
4243 */
4244
4245int register_inet6addr_notifier(struct notifier_block *nb)
4246{
1ab1457c 4247 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4248}
4249
7159039a
YH		 4250EXPORT_SYMBOL(register_inet6addr_notifier);
4251
1da177e4
LT		 4252int unregister_inet6addr_notifier(struct notifier_block *nb)
4253{
1ab1457c 4254 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4255}
4256
7159039a
YH		 4257EXPORT_SYMBOL(unregister_inet6addr_notifier);
4258
1da177e4
LT		 4259/*
4260 * Init / cleanup code
4261 */
4262
4263int __init addrconf_init(void)
4264{
2a8cc6c8
YH		 4265 int err;
4266
4267 if ((err = ipv6_addr_label_init()) < 0) {
4268 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4269 err);
4270 return err;
4271 }
1da177e4 4272
e0da5a48
PE		 4273 register_pernet_subsys(&addrconf_ops);
4274
1da177e4
LT		 4275 /* The addrconf netdev notifier requires that loopback_dev
4276 * has it's ipv6 private information allocated and setup
4277 * before it can bring up and give link-local addresses
4278 * to other devices which are up.
4279 *
4280 * Unfortunately, loopback_dev is not necessarily the first
4281 * entry in the global dev_base list of net devices. In fact,
4282 * it is likely to be the very last entry on that list.
4283 * So this causes the notifier registry below to try and
4284 * give link-local addresses to all devices besides loopback_dev
4285 * first, then loopback_dev, which cases all the non-loopback_dev
4286 * devices to fail to get a link-local address.
4287 *
4288 * So, as a temporary fix, allocate the ipv6 structure for
4289 * loopback_dev first by hand.
4290 * Longer term, all of the dependencies ipv6 has upon the loopback
4291 * device and it being up should be removed.
4292 */
4293 rtnl_lock();
2774c7ab 4294 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4295 err = -ENOMEM;
4296 rtnl_unlock();
4297 if (err)
e0da5a48 4298 goto errlo;
1da177e4 4299
2774c7ab
EB		 4300 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4301 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4302#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4303 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4304 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4305 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4306 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4307#endif
c62dba90 4308
1da177e4
LT		 4309 register_netdevice_notifier(&ipv6_dev_notf);
4310
1da177e4 4311 addrconf_verify(0);
c127ea2c
TG		 4312
4313 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4314 if (err < 0)
4315 goto errout;
4316
4317 /* Only the first call to __rtnl_register can fail */
4318 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4319 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4320 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4321 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4322 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4323
2a8cc6c8
YH		 4324 ipv6_addr_label_rtnl_register();
4325
1da177e4 4326 return 0;
c127ea2c
TG		 4327errout:
4328 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4329errlo:
4330 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4331
4332 return err;
1da177e4
LT		 4333}
4334
09f7709f 4335void addrconf_cleanup(void)
1da177e4 4336{
1ab1457c 4337 struct net_device *dev;
1ab1457c 4338 struct inet6_ifaddr *ifa;
1da177e4
LT		 4339 int i;
4340
4341 unregister_netdevice_notifier(&ipv6_dev_notf);
4342
e0da5a48 4343 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4344
4345 rtnl_lock();
4346
4347 /*
4348 * clean dev list.
4349 */
4350
881d966b 4351 for_each_netdev(&init_net, dev) {
dffe4f04 4352 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4353 continue;
4354 addrconf_ifdown(dev, 1);
4355 }
2774c7ab 4356 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4357
4358 /*
4359 * Check hash table.
4360 */
4361
4362 write_lock_bh(&addrconf_hash_lock);
4363 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4364 for (ifa=inet6_addr_lst[i]; ifa; ) {
4365 struct inet6_ifaddr *bifa;
4366
4367 bifa = ifa;
4368 ifa = ifa->lst_next;
4369 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4370 /* Do not free it; something is wrong.
4371 Now we can investigate it with debugger.
4372 */
4373 }
4374 }
4375 write_unlock_bh(&addrconf_hash_lock);
4376
4377 del_timer(&addr_chk_timer);
4378
4379 rtnl_unlock();
1da177e4 4380}
Clone of davem's net-next-2.6 tree