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[NETNS][IPV6] ip6_fib - make it per network namespace
[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
99cd07a5
JMT		 1128
1129 /* Skip rule 8 for orchid -> non-orchid address pairs. */
1130 if (ipv6_addr_orchid(&ifa->addr) && !ipv6_addr_orchid(daddr))
1131 continue;
1132
072047e4 1133 /* Rule 8: Use longest matching prefix */
12da2a43 1134 if (hiscore.rule < 8) {
072047e4 1135 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1136 hiscore.rule++;
1137 }
072047e4
YH		 1138 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1139 if (score.matchlen > hiscore.matchlen) {
1140 score.rule = 8;
1141 goto record_it;
1da177e4 1142 }
072047e4
YH		 1143#if 0
1144 else if (score.matchlen < hiscore.matchlen)
1145 continue;
1146#endif
1147
1148 /* Final Rule: choose first available one */
1149 continue;
1150record_it:
1151 if (ifa_result)
1152 in6_ifa_put(ifa_result);
1153 in6_ifa_hold(ifa);
1154 ifa_result = ifa;
1155 hiscore = score;
1da177e4 1156 }
072047e4 1157 read_unlock_bh(&idev->lock);
1da177e4 1158 }
8814c4b5 1159 rcu_read_unlock();
1da177e4
LT		 1160 read_unlock(&dev_base_lock);
1161
072047e4
YH		 1162 if (!ifa_result)
1163 return -EADDRNOTAVAIL;
1ab1457c 1164
072047e4
YH		 1165 ipv6_addr_copy(saddr, &ifa_result->addr);
1166 in6_ifa_put(ifa_result);
1167 return 0;
1da177e4
LT		 1168}
1169
5e5f3f0f 1170EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1171
95c385b4
NH		 1172int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1173 unsigned char banned_flags)
1da177e4
LT		 1174{
1175 struct inet6_dev *idev;
1176 int err = -EADDRNOTAVAIL;
1177
8814c4b5 1178 rcu_read_lock();
1da177e4
LT		 1179 if ((idev = __in6_dev_get(dev)) != NULL) {
1180 struct inet6_ifaddr *ifp;
1181
1182 read_lock_bh(&idev->lock);
1183 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1184 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1185 ipv6_addr_copy(addr, &ifp->addr);
1186 err = 0;
1187 break;
1188 }
1189 }
1190 read_unlock_bh(&idev->lock);
1191 }
8814c4b5 1192 rcu_read_unlock();
1da177e4
LT		 1193 return err;
1194}
1195
1196static int ipv6_count_addresses(struct inet6_dev *idev)
1197{
1198 int cnt = 0;
1199 struct inet6_ifaddr *ifp;
1200
1201 read_lock_bh(&idev->lock);
1202 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1203 cnt++;
1204 read_unlock_bh(&idev->lock);
1205 return cnt;
1206}
1207
bfeade08
DL		 1208int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1209 struct net_device *dev, int strict)
1da177e4
LT		 1210{
1211 struct inet6_ifaddr * ifp;
1212 u8 hash = ipv6_addr_hash(addr);
1213
1214 read_lock_bh(&addrconf_hash_lock);
1215 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
bfeade08
DL		 1216 if (ifp->idev->dev->nd_net != net)
1217 continue;
1da177e4
LT		 1218 if (ipv6_addr_equal(&ifp->addr, addr) &&
1219 !(ifp->flags&IFA_F_TENTATIVE)) {
1220 if (dev == NULL || ifp->idev->dev == dev ||
1221 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1222 break;
1223 }
1224 }
1225 read_unlock_bh(&addrconf_hash_lock);
1226 return ifp != NULL;
1227}
7159039a
YH		 1228EXPORT_SYMBOL(ipv6_chk_addr);
1229
1da177e4 1230static
06bfe655
DL		 1231int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1232 struct net_device *dev)
1da177e4
LT		 1233{
1234 struct inet6_ifaddr * ifp;
1235 u8 hash = ipv6_addr_hash(addr);
1236
1237 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
06bfe655
DL		 1238 if (ifp->idev->dev->nd_net != net)
1239 continue;
1da177e4
LT		 1240 if (ipv6_addr_equal(&ifp->addr, addr)) {
1241 if (dev == NULL || ifp->idev->dev == dev)
1242 break;
1243 }
1244 }
1245 return ifp != NULL;
1246}
1247
1cab3da6
DL		 1248struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1249 struct net_device *dev, int strict)
1da177e4
LT		 1250{
1251 struct inet6_ifaddr * ifp;
1252 u8 hash = ipv6_addr_hash(addr);
1253
1254 read_lock_bh(&addrconf_hash_lock);
1255 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1cab3da6
DL		 1256 if (ifp->idev->dev->nd_net != net)
1257 continue;
1da177e4
LT		 1258 if (ipv6_addr_equal(&ifp->addr, addr)) {
1259 if (dev == NULL || ifp->idev->dev == dev ||
1260 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1261 in6_ifa_hold(ifp);
1262 break;
1263 }
1264 }
1265 }
1266 read_unlock_bh(&addrconf_hash_lock);
1267
1268 return ifp;
1269}
1270
1271int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1272{
1273 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1274 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1275 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1276 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1277 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1278 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1279 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1280 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1281
1282 if (!sk2_rcv_saddr && !sk_ipv6only)
1283 return 1;
1284
1285 if (addr_type2 == IPV6_ADDR_ANY &&
1286 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1287 return 1;
1288
1289 if (addr_type == IPV6_ADDR_ANY &&
1290 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1291 return 1;
1292
1293 if (sk2_rcv_saddr6 &&
1294 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1295 return 1;
1296
1297 if (addr_type == IPV6_ADDR_MAPPED &&
1298 !sk2_ipv6only &&
1299 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1300 return 1;
1301
1302 return 0;
1303}
1304
1305/* Gets referenced address, destroys ifaddr */
1306
9f5336e2 1307static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1308{
1da177e4
LT		 1309 if (ifp->flags&IFA_F_PERMANENT) {
1310 spin_lock_bh(&ifp->lock);
1311 addrconf_del_timer(ifp);
1312 ifp->flags |= IFA_F_TENTATIVE;
1313 spin_unlock_bh(&ifp->lock);
1314 in6_ifa_put(ifp);
1315#ifdef CONFIG_IPV6_PRIVACY
1316 } else if (ifp->flags&IFA_F_TEMPORARY) {
1317 struct inet6_ifaddr *ifpub;
1318 spin_lock_bh(&ifp->lock);
1319 ifpub = ifp->ifpub;
1320 if (ifpub) {
1321 in6_ifa_hold(ifpub);
1322 spin_unlock_bh(&ifp->lock);
1323 ipv6_create_tempaddr(ifpub, ifp);
1324 in6_ifa_put(ifpub);
1325 } else {
1326 spin_unlock_bh(&ifp->lock);
1327 }
1328 ipv6_del_addr(ifp);
1329#endif
1330 } else
1331 ipv6_del_addr(ifp);
1332}
1333
3c21edbd
YH		 1334void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1335{
1336 if (net_ratelimit())
1337 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1338 addrconf_dad_stop(ifp);
1339}
1da177e4
LT		 1340
1341/* Join to solicited addr multicast group. */
1342
1343void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1344{
1345 struct in6_addr maddr;
1346
1347 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348 return;
1349
1350 addrconf_addr_solict_mult(addr, &maddr);
1351 ipv6_dev_mc_inc(dev, &maddr);
1352}
1353
1354void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1355{
1356 struct in6_addr maddr;
1357
1358 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1359 return;
1360
1361 addrconf_addr_solict_mult(addr, &maddr);
1362 __ipv6_dev_mc_dec(idev, &maddr);
1363}
1364
20380731 1365static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1366{
1367 struct in6_addr addr;
1368 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1369 if (ipv6_addr_any(&addr))
1370 return;
1371 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1372}
1373
20380731 1374static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1375{
1376 struct in6_addr addr;
1377 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1378 if (ipv6_addr_any(&addr))
1379 return;
1380 __ipv6_dev_ac_dec(ifp->idev, &addr);
1381}
1382
073a8e0e
YH		 1383static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1384{
1385 if (dev->addr_len != ETH_ALEN)
1386 return -1;
1387 memcpy(eui, dev->dev_addr, 3);
1388 memcpy(eui + 5, dev->dev_addr + 3, 3);
1389
1390 /*
1391 * The zSeries OSA network cards can be shared among various
1392 * OS instances, but the OSA cards have only one MAC address.
1393 * This leads to duplicate address conflicts in conjunction
1394 * with IPv6 if more than one instance uses the same card.
1395 *
1396 * The driver for these cards can deliver a unique 16-bit
1397 * identifier for each instance sharing the same card. It is
1398 * placed instead of 0xFFFE in the interface identifier. The
1399 * "u" bit of the interface identifier is not inverted in this
1400 * case. Hence the resulting interface identifier has local
1401 * scope according to RFC2373.
1402 */
1403 if (dev->dev_id) {
1404 eui[3] = (dev->dev_id >> 8) & 0xFF;
1405 eui[4] = dev->dev_id & 0xFF;
1406 } else {
1407 eui[3] = 0xFF;
1408 eui[4] = 0xFE;
1409 eui[0] ^= 2;
1410 }
1411 return 0;
1412}
1413
1414static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1415{
1416 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1417 if (dev->addr_len != ARCNET_ALEN)
1418 return -1;
1419 memset(eui, 0, 7);
1420 eui[7] = *(u8*)dev->dev_addr;
1421 return 0;
1422}
1423
1424static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1425{
1426 if (dev->addr_len != INFINIBAND_ALEN)
1427 return -1;
1428 memcpy(eui, dev->dev_addr + 12, 8);
1429 eui[0] |= 2;
1430 return 0;
1431}
1432
1da177e4
LT		 1433static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1434{
1435 switch (dev->type) {
1436 case ARPHRD_ETHER:
1437 case ARPHRD_FDDI:
1438 case ARPHRD_IEEE802_TR:
073a8e0e 1439 return addrconf_ifid_eui48(eui, dev);
1da177e4 1440 case ARPHRD_ARCNET:
073a8e0e 1441 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1442 case ARPHRD_INFINIBAND:
073a8e0e 1443 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1444 case ARPHRD_SIT:
1445 if (dev->priv_flags & IFF_ISATAP)
1446 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1447 }
1448 return -1;
1449}
1450
1451static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1452{
1453 int err = -1;
1454 struct inet6_ifaddr *ifp;
1455
1456 read_lock_bh(&idev->lock);
1457 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1458 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1459 memcpy(eui, ifp->addr.s6_addr+8, 8);
1460 err = 0;
1461 break;
1462 }
1463 }
1464 read_unlock_bh(&idev->lock);
1465 return err;
1466}
1467
1468#ifdef CONFIG_IPV6_PRIVACY
1469/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1470static int __ipv6_regen_rndid(struct inet6_dev *idev)
1471{
1da177e4 1472regen:
955189ef 1473 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1474 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1475
1476 /*
1477 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1478 * check if generated address is not inappropriate
1479 *
1480 * - Reserved subnet anycast (RFC 2526)
1481 * 11111101 11....11 1xxxxxxx
c7dc89c0 1482 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1483 * 00-00-5E-FE-xx-xx-xx-xx
1484 * - value 0
1485 * - XXX: already assigned to an address on the device
1486 */
1ab1457c 1487 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1488 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1489 (idev->rndid[7]&0x80))
1490 goto regen;
1491 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1492 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1493 goto regen;
1494 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1495 goto regen;
1496 }
1497
1498 return 0;
1499}
1500
1501static void ipv6_regen_rndid(unsigned long data)
1502{
1503 struct inet6_dev *idev = (struct inet6_dev *) data;
1504 unsigned long expires;
1505
8814c4b5 1506 rcu_read_lock_bh();
1da177e4
LT		 1507 write_lock_bh(&idev->lock);
1508
1509 if (idev->dead)
1510 goto out;
1511
1512 if (__ipv6_regen_rndid(idev) < 0)
1513 goto out;
1ab1457c 1514
1da177e4 1515 expires = jiffies +
1ab1457c 1516 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1517 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1518 if (time_before(expires, jiffies)) {
1519 printk(KERN_WARNING
1520 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1521 idev->dev->name);
1522 goto out;
1523 }
1524
1525 if (!mod_timer(&idev->regen_timer, expires))
1526 in6_dev_hold(idev);
1527
1528out:
1529 write_unlock_bh(&idev->lock);
8814c4b5 1530 rcu_read_unlock_bh();
1da177e4
LT		 1531 in6_dev_put(idev);
1532}
1533
1534static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1535 int ret = 0;
1536
1537 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1538 ret = __ipv6_regen_rndid(idev);
1539 return ret;
1540}
1541#endif
1542
1543/*
1544 * Add prefix route.
1545 */
1546
1547static void
1548addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1549 unsigned long expires, u32 flags)
1da177e4 1550{
86872cb5
TG		 1551 struct fib6_config cfg = {
1552 .fc_table = RT6_TABLE_PREFIX,
1553 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1554 .fc_ifindex = dev->ifindex,
1555 .fc_expires = expires,
1556 .fc_dst_len = plen,
1557 .fc_flags = RTF_UP | flags,
f1243c2d 1558 .fc_nlinfo.nl_net = &init_net,
86872cb5 1559 };
1da177e4 1560
86872cb5 1561 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1562
1563 /* Prevent useless cloning on PtP SIT.
1564 This thing is done here expecting that the whole
1565 class of non-broadcast devices need not cloning.
1566 */
0be669bb 1567#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1568 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1569 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1570#endif
1da177e4 1571
86872cb5 1572 ip6_route_add(&cfg);
1da177e4
LT		 1573}
1574
1575/* Create "default" multicast route to the interface */
1576
1577static void addrconf_add_mroute(struct net_device *dev)
1578{
86872cb5
TG		 1579 struct fib6_config cfg = {
1580 .fc_table = RT6_TABLE_LOCAL,
1581 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1582 .fc_ifindex = dev->ifindex,
1583 .fc_dst_len = 8,
1584 .fc_flags = RTF_UP,
f1243c2d 1585 .fc_nlinfo.nl_net = &init_net,
86872cb5
TG		 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,
f1243c2d 1602 .fc_nlinfo.nl_net = &init_net,
86872cb5 1603 };
1da177e4
LT		 1604
1605 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1606 ip6_route_add(&cfg);
1da177e4 1607}
0be669bb 1608#endif
1da177e4
LT		 1609
1610static void addrconf_add_lroute(struct net_device *dev)
1611{
1612 struct in6_addr addr;
1613
1614 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1615 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1616}
1617
1618static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1619{
1620 struct inet6_dev *idev;
1621
1622 ASSERT_RTNL();
1623
1624 if ((idev = ipv6_find_idev(dev)) == NULL)
1625 return NULL;
1626
1627 /* Add default multicast route */
1628 addrconf_add_mroute(dev);
1629
1630 /* Add link local route */
1631 addrconf_add_lroute(dev);
1632 return idev;
1633}
1634
1635void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1636{
1637 struct prefix_info *pinfo;
1638 __u32 valid_lft;
1639 __u32 prefered_lft;
1640 int addr_type;
1641 unsigned long rt_expires;
1642 struct inet6_dev *in6_dev;
1643
1644 pinfo = (struct prefix_info *) opt;
1ab1457c 1645
1da177e4
LT		 1646 if (len < sizeof(struct prefix_info)) {
1647 ADBG(("addrconf: prefix option too short\n"));
1648 return;
1649 }
1ab1457c 1650
1da177e4
LT		 1651 /*
1652 * Validation checks ([ADDRCONF], page 19)
1653 */
1654
1655 addr_type = ipv6_addr_type(&pinfo->prefix);
1656
1657 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1658 return;
1659
1660 valid_lft = ntohl(pinfo->valid);
1661 prefered_lft = ntohl(pinfo->prefered);
1662
1663 if (prefered_lft > valid_lft) {
1664 if (net_ratelimit())
1665 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1666 return;
1667 }
1668
1669 in6_dev = in6_dev_get(dev);
1670
1671 if (in6_dev == NULL) {
1672 if (net_ratelimit())
1673 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1674 return;
1675 }
1676
1677 /*
1678 * Two things going on here:
1679 * 1) Add routes for on-link prefixes
1680 * 2) Configure prefixes with the auto flag set
1681 */
1682
1683 /* Avoid arithmetic overflow. Really, we could
1684 save rt_expires in seconds, likely valid_lft,
1685 but it would require division in fib gc, that it
1686 not good.
1687 */
1688 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1689 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1690 else
3dd4bc68
YH		 1691 rt_expires = valid_lft * HZ;
1692
1693 /*
1694 * We convert this (in jiffies) to clock_t later.
1695 * Avoid arithmetic overflow there as well.
1696 * Overflow can happen only if HZ < USER_HZ.
1697 */
1698 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1699 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1700
1701 if (pinfo->onlink) {
1702 struct rt6_info *rt;
1703 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1704
1705 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1706 if (rt->rt6i_flags&RTF_EXPIRES) {
1707 if (valid_lft == 0) {
e0a1ad73 1708 ip6_del_rt(rt);
1da177e4
LT		 1709 rt = NULL;
1710 } else {
3dd4bc68 1711 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1712 }
1713 }
1714 } else if (valid_lft) {
1715 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1716 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1717 }
1718 if (rt)
1719 dst_release(&rt->u.dst);
1720 }
1721
1722 /* Try to figure out our local address for this prefix */
1723
1724 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1725 struct inet6_ifaddr * ifp;
1726 struct in6_addr addr;
1727 int create = 0, update_lft = 0;
1728
1729 if (pinfo->prefix_len == 64) {
1730 memcpy(&addr, &pinfo->prefix, 8);
1731 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1732 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1733 in6_dev_put(in6_dev);
1734 return;
1735 }
1736 goto ok;
1737 }
1738 if (net_ratelimit())
1739 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1740 pinfo->prefix_len);
1741 in6_dev_put(in6_dev);
1742 return;
1743
1744ok:
1745
1cab3da6 1746 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1da177e4
LT		 1747
1748 if (ifp == NULL && valid_lft) {
1749 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1750 u32 addr_flags = 0;
1751
1752#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1753 if (in6_dev->cnf.optimistic_dad &&
1754 !ipv6_devconf.forwarding)
1755 addr_flags = IFA_F_OPTIMISTIC;
1756#endif
1da177e4
LT		 1757
1758 /* Do not allow to create too much of autoconfigured
1759 * addresses; this would be too easy way to crash kernel.
1760 */
1761 if (!max_addresses ||
1762 ipv6_count_addresses(in6_dev) < max_addresses)
1763 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1764 addr_type&IPV6_ADDR_SCOPE_MASK,
1765 addr_flags);
1da177e4
LT		 1766
1767 if (!ifp || IS_ERR(ifp)) {
1768 in6_dev_put(in6_dev);
1769 return;
1770 }
1771
1772 update_lft = create = 1;
1773 ifp->cstamp = jiffies;
1774 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1775 }
1776
1777 if (ifp) {
1778 int flags;
1779 unsigned long now;
1780#ifdef CONFIG_IPV6_PRIVACY
1781 struct inet6_ifaddr *ift;
1782#endif
1783 u32 stored_lft;
1784
1785 /* update lifetime (RFC2462 5.5.3 e) */
1786 spin_lock(&ifp->lock);
1787 now = jiffies;
1788 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1789 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1790 else
1791 stored_lft = 0;
1792 if (!update_lft && stored_lft) {
1793 if (valid_lft > MIN_VALID_LIFETIME ||
1794 valid_lft > stored_lft)
1795 update_lft = 1;
1796 else if (stored_lft <= MIN_VALID_LIFETIME) {
1797 /* valid_lft <= stored_lft is always true */
1798 /* XXX: IPsec */
1799 update_lft = 0;
1800 } else {
1801 valid_lft = MIN_VALID_LIFETIME;
1802 if (valid_lft < prefered_lft)
1803 prefered_lft = valid_lft;
1804 update_lft = 1;
1805 }
1806 }
1807
1808 if (update_lft) {
1809 ifp->valid_lft = valid_lft;
1810 ifp->prefered_lft = prefered_lft;
1811 ifp->tstamp = now;
1812 flags = ifp->flags;
1813 ifp->flags &= ~IFA_F_DEPRECATED;
1814 spin_unlock(&ifp->lock);
1815
1816 if (!(flags&IFA_F_TENTATIVE))
1817 ipv6_ifa_notify(0, ifp);
1818 } else
1819 spin_unlock(&ifp->lock);
1820
1821#ifdef CONFIG_IPV6_PRIVACY
1822 read_lock_bh(&in6_dev->lock);
1823 /* update all temporary addresses in the list */
1824 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1825 /*
1826 * When adjusting the lifetimes of an existing
1827 * temporary address, only lower the lifetimes.
1828 * Implementations must not increase the
1829 * lifetimes of an existing temporary address
1830 * when processing a Prefix Information Option.
1831 */
1832 spin_lock(&ift->lock);
1833 flags = ift->flags;
1834 if (ift->valid_lft > valid_lft &&
1835 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1836 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1837 if (ift->prefered_lft > prefered_lft &&
1838 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1839 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1840 spin_unlock(&ift->lock);
1841 if (!(flags&IFA_F_TENTATIVE))
1842 ipv6_ifa_notify(0, ift);
1843 }
1844
1845 if (create && in6_dev->cnf.use_tempaddr > 0) {
1846 /*
1847 * When a new public address is created as described in [ADDRCONF],
1848 * also create a new temporary address.
1849 */
1ab1457c 1850 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1851 ipv6_create_tempaddr(ifp, NULL);
1852 } else {
1853 read_unlock_bh(&in6_dev->lock);
1854 }
1855#endif
1856 in6_ifa_put(ifp);
1857 addrconf_verify(0);
1858 }
1859 }
1860 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1861 in6_dev_put(in6_dev);
1862}
1863
1864/*
1865 * Set destination address.
1866 * Special case for SIT interfaces where we create a new "virtual"
1867 * device.
1868 */
1869int addrconf_set_dstaddr(void __user *arg)
1870{
1871 struct in6_ifreq ireq;
1872 struct net_device *dev;
1873 int err = -EINVAL;
1874
1875 rtnl_lock();
1876
1877 err = -EFAULT;
1878 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1879 goto err_exit;
1880
881d966b 1881 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1882
1883 err = -ENODEV;
1884 if (dev == NULL)
1885 goto err_exit;
1886
0be669bb 1887#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1888 if (dev->type == ARPHRD_SIT) {
1889 struct ifreq ifr;
1890 mm_segment_t oldfs;
1891 struct ip_tunnel_parm p;
1892
1893 err = -EADDRNOTAVAIL;
1894 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1895 goto err_exit;
1896
1897 memset(&p, 0, sizeof(p));
1898 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1899 p.iph.saddr = 0;
1900 p.iph.version = 4;
1901 p.iph.ihl = 5;
1902 p.iph.protocol = IPPROTO_IPV6;
1903 p.iph.ttl = 64;
d20b3109 1904 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1905
1906 oldfs = get_fs(); set_fs(KERNEL_DS);
1907 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1908 set_fs(oldfs);
1909
1910 if (err == 0) {
1911 err = -ENOBUFS;
881d966b 1912 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1913 goto err_exit;
1914 err = dev_open(dev);
1915 }
1916 }
0be669bb 1917#endif
1da177e4
LT		 1918
1919err_exit:
1920 rtnl_unlock();
1921 return err;
1922}
1923
1924/*
1925 * Manual configuration of address on an interface
1926 */
0778769d 1927static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1928 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1929{
1930 struct inet6_ifaddr *ifp;
1931 struct inet6_dev *idev;
1932 struct net_device *dev;
1933 int scope;
46d48046 1934 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1935
1936 ASSERT_RTNL();
1ab1457c 1937
0778769d
NT		 1938 /* check the lifetime */
1939 if (!valid_lft || prefered_lft > valid_lft)
1940 return -EINVAL;
1941
881d966b 1942 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1943 return -ENODEV;
1ab1457c 1944
1da177e4
LT		 1945 if ((idev = addrconf_add_dev(dev)) == NULL)
1946 return -ENOBUFS;
1947
1948 scope = ipv6_addr_scope(pfx);
1949
46d48046 1950 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1951 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1952 flags = 0;
1953 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1954 valid_lft = 0x7FFFFFFF/HZ;
1955
1956 if (prefered_lft == 0)
1957 ifa_flags |= IFA_F_DEPRECATED;
1958 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1959 (prefered_lft != INFINITY_LIFE_TIME))
1960 prefered_lft = 0x7FFFFFFF/HZ;
1961
1962 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1963
1da177e4 1964 if (!IS_ERR(ifp)) {
06aebfb7 1965 spin_lock_bh(&ifp->lock);
0778769d
NT		 1966 ifp->valid_lft = valid_lft;
1967 ifp->prefered_lft = prefered_lft;
1968 ifp->tstamp = jiffies;
06aebfb7 1969 spin_unlock_bh(&ifp->lock);
0778769d 1970
46d48046
YH		 1971 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1972 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1973 /*
1974 * Note that section 3.1 of RFC 4429 indicates
1975 * that the Optimistic flag should not be set for
1976 * manually configured addresses
1977 */
1da177e4
LT		 1978 addrconf_dad_start(ifp, 0);
1979 in6_ifa_put(ifp);
0778769d 1980 addrconf_verify(0);
1da177e4
LT		 1981 return 0;
1982 }
1983
1984 return PTR_ERR(ifp);
1985}
1986
1987static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1988{
1989 struct inet6_ifaddr *ifp;
1990 struct inet6_dev *idev;
1991 struct net_device *dev;
1ab1457c 1992
881d966b 1993 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1994 return -ENODEV;
1995
1996 if ((idev = __in6_dev_get(dev)) == NULL)
1997 return -ENXIO;
1998
1999 read_lock_bh(&idev->lock);
2000 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2001 if (ifp->prefix_len == plen &&
2002 ipv6_addr_equal(pfx, &ifp->addr)) {
2003 in6_ifa_hold(ifp);
2004 read_unlock_bh(&idev->lock);
1ab1457c 2005
1da177e4
LT		 2006 ipv6_del_addr(ifp);
2007
2008 /* If the last address is deleted administratively,
2009 disable IPv6 on this interface.
2010 */
2011 if (idev->addr_list == NULL)
2012 addrconf_ifdown(idev->dev, 1);
2013 return 0;
2014 }
2015 }
2016 read_unlock_bh(&idev->lock);
2017 return -EADDRNOTAVAIL;
2018}
2019
2020
2021int addrconf_add_ifaddr(void __user *arg)
2022{
2023 struct in6_ifreq ireq;
2024 int err;
1ab1457c 2025
1da177e4
LT		 2026 if (!capable(CAP_NET_ADMIN))
2027 return -EPERM;
1ab1457c 2028
1da177e4
LT		 2029 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2030 return -EFAULT;
2031
2032 rtnl_lock();
0778769d 2033 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2034 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2035 rtnl_unlock();
2036 return err;
2037}
2038
2039int addrconf_del_ifaddr(void __user *arg)
2040{
2041 struct in6_ifreq ireq;
2042 int err;
1ab1457c 2043
1da177e4
LT		 2044 if (!capable(CAP_NET_ADMIN))
2045 return -EPERM;
2046
2047 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2048 return -EFAULT;
2049
2050 rtnl_lock();
2051 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2052 rtnl_unlock();
2053 return err;
2054}
2055
0be669bb 2056#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2057static void sit_add_v4_addrs(struct inet6_dev *idev)
2058{
2059 struct inet6_ifaddr * ifp;
2060 struct in6_addr addr;
2061 struct net_device *dev;
2062 int scope;
2063
2064 ASSERT_RTNL();
2065
2066 memset(&addr, 0, sizeof(struct in6_addr));
2067 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2068
2069 if (idev->dev->flags&IFF_POINTOPOINT) {
2070 addr.s6_addr32[0] = htonl(0xfe800000);
2071 scope = IFA_LINK;
2072 } else {
2073 scope = IPV6_ADDR_COMPATv4;
2074 }
2075
2076 if (addr.s6_addr32[3]) {
2077 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2078 if (!IS_ERR(ifp)) {
2079 spin_lock_bh(&ifp->lock);
2080 ifp->flags &= ~IFA_F_TENTATIVE;
2081 spin_unlock_bh(&ifp->lock);
2082 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2083 in6_ifa_put(ifp);
2084 }
2085 return;
2086 }
2087
881d966b 2088 for_each_netdev(&init_net, dev) {
e5ed6399 2089 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2090 if (in_dev && (dev->flags & IFF_UP)) {
2091 struct in_ifaddr * ifa;
2092
2093 int flag = scope;
2094
2095 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2096 int plen;
2097
2098 addr.s6_addr32[3] = ifa->ifa_local;
2099
2100 if (ifa->ifa_scope == RT_SCOPE_LINK)
2101 continue;
2102 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2103 if (idev->dev->flags&IFF_POINTOPOINT)
2104 continue;
2105 flag |= IFA_HOST;
2106 }
2107 if (idev->dev->flags&IFF_POINTOPOINT)
2108 plen = 64;
2109 else
2110 plen = 96;
2111
2112 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2113 IFA_F_PERMANENT);
2114 if (!IS_ERR(ifp)) {
2115 spin_lock_bh(&ifp->lock);
2116 ifp->flags &= ~IFA_F_TENTATIVE;
2117 spin_unlock_bh(&ifp->lock);
2118 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2119 in6_ifa_put(ifp);
2120 }
2121 }
2122 }
1ab1457c 2123 }
1da177e4 2124}
0be669bb 2125#endif
1da177e4
LT		 2126
2127static void init_loopback(struct net_device *dev)
2128{
2129 struct inet6_dev *idev;
2130 struct inet6_ifaddr * ifp;
2131
2132 /* ::1 */
2133
2134 ASSERT_RTNL();
2135
2136 if ((idev = ipv6_find_idev(dev)) == NULL) {
2137 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2138 return;
2139 }
2140
2141 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2142 if (!IS_ERR(ifp)) {
2143 spin_lock_bh(&ifp->lock);
2144 ifp->flags &= ~IFA_F_TENTATIVE;
2145 spin_unlock_bh(&ifp->lock);
2146 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2147 in6_ifa_put(ifp);
2148 }
2149}
2150
2151static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2152{
2153 struct inet6_ifaddr * ifp;
95c385b4
NH		 2154 u32 addr_flags = IFA_F_PERMANENT;
2155
2156#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2157 if (idev->cnf.optimistic_dad &&
2158 !ipv6_devconf.forwarding)
2159 addr_flags |= IFA_F_OPTIMISTIC;
2160#endif
1da177e4 2161
95c385b4
NH		 2162
2163 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2164 if (!IS_ERR(ifp)) {
46d48046 2165 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2166 addrconf_dad_start(ifp, 0);
2167 in6_ifa_put(ifp);
2168 }
2169}
2170
2171static void addrconf_dev_config(struct net_device *dev)
2172{
2173 struct in6_addr addr;
2174 struct inet6_dev * idev;
2175
2176 ASSERT_RTNL();
2177
74235a25
HX		 2178 if ((dev->type != ARPHRD_ETHER) &&
2179 (dev->type != ARPHRD_FDDI) &&
2180 (dev->type != ARPHRD_IEEE802_TR) &&
2181 (dev->type != ARPHRD_ARCNET) &&
2182 (dev->type != ARPHRD_INFINIBAND)) {
2183 /* Alas, we support only Ethernet autoconfiguration. */
2184 return;
2185 }
2186
1da177e4
LT		 2187 idev = addrconf_add_dev(dev);
2188 if (idev == NULL)
2189 return;
2190
2191 memset(&addr, 0, sizeof(struct in6_addr));
2192 addr.s6_addr32[0] = htonl(0xFE800000);
2193
2194 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2195 addrconf_add_linklocal(idev, &addr);
2196}
2197
0be669bb 2198#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2199static void addrconf_sit_config(struct net_device *dev)
2200{
2201 struct inet6_dev *idev;
2202
2203 ASSERT_RTNL();
2204
1ab1457c
YH		 2205 /*
2206 * Configure the tunnel with one of our IPv4
2207 * addresses... we should configure all of
1da177e4
LT		 2208 * our v4 addrs in the tunnel
2209 */
2210
2211 if ((idev = ipv6_find_idev(dev)) == NULL) {
2212 printk(KERN_DEBUG "init sit: add_dev failed\n");
2213 return;
2214 }
2215
c7dc89c0
FT		 2216 if (dev->priv_flags & IFF_ISATAP) {
2217 struct in6_addr addr;
2218
2219 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2220 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2221 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2222 addrconf_add_linklocal(idev, &addr);
2223 return;
2224 }
2225
1da177e4
LT		 2226 sit_add_v4_addrs(idev);
2227
2228 if (dev->flags&IFF_POINTOPOINT) {
2229 addrconf_add_mroute(dev);
2230 addrconf_add_lroute(dev);
2231 } else
2232 sit_route_add(dev);
2233}
0be669bb 2234#endif
1da177e4
LT		 2235
2236static inline int
2237ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2238{
2239 struct in6_addr lladdr;
2240
95c385b4 2241 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2242 addrconf_add_linklocal(idev, &lladdr);
2243 return 0;
2244 }
2245 return -1;
2246}
2247
2248static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2249{
2250 struct net_device *link_dev;
2251
2252 /* first try to inherit the link-local address from the link device */
2253 if (idev->dev->iflink &&
881d966b 2254 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2255 if (!ipv6_inherit_linklocal(idev, link_dev))
2256 return;
2257 }
2258 /* then try to inherit it from any device */
881d966b 2259 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2260 if (!ipv6_inherit_linklocal(idev, link_dev))
2261 return;
2262 }
2263 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2264}
2265
2266/*
2267 * Autoconfigure tunnel with a link-local address so routing protocols,
2268 * DHCPv6, MLD etc. can be run over the virtual link
2269 */
2270
2271static void addrconf_ip6_tnl_config(struct net_device *dev)
2272{
2273 struct inet6_dev *idev;
2274
2275 ASSERT_RTNL();
2276
2277 if ((idev = addrconf_add_dev(dev)) == NULL) {
2278 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2279 return;
2280 }
2281 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2282}
2283
1ab1457c 2284static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2285 void * data)
2286{
2287 struct net_device *dev = (struct net_device *) data;
74235a25 2288 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2289 int run_pending = 0;
b217d616 2290 int err;
1da177e4 2291
e9dc8653
EB		 2292 if (dev->nd_net != &init_net)
2293 return NOTIFY_DONE;
2294
1da177e4 2295 switch(event) {
45ba9dd2 2296 case NETDEV_REGISTER:
74235a25 2297 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2298 idev = ipv6_add_dev(dev);
2299 if (!idev)
b217d616 2300 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2301 }
2302 break;
1da177e4 2303 case NETDEV_UP:
3c21edbd 2304 case NETDEV_CHANGE:
c2edacf8
JV		 2305 if (dev->flags & IFF_SLAVE)
2306 break;
2307
3c21edbd 2308 if (event == NETDEV_UP) {
f24e3d65 2309 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2310 /* device is not ready yet. */
2311 printk(KERN_INFO
2312 "ADDRCONF(NETDEV_UP): %s: "
2313 "link is not ready\n",
2314 dev->name);
2315 break;
2316 }
99081049 2317
d31c7b8f
EP		 2318 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2319 idev = ipv6_add_dev(dev);
2320
99081049
KS		 2321 if (idev)
2322 idev->if_flags |= IF_READY;
3c21edbd 2323 } else {
f24e3d65 2324 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2325 /* device is still not ready. */
2326 break;
2327 }
2328
2329 if (idev) {
2330 if (idev->if_flags & IF_READY) {
2331 /* device is already configured. */
2332 break;
2333 }
2334 idev->if_flags |= IF_READY;
2335 }
2336
2337 printk(KERN_INFO
2338 "ADDRCONF(NETDEV_CHANGE): %s: "
2339 "link becomes ready\n",
2340 dev->name);
2341
c5e33bdd 2342 run_pending = 1;
3c21edbd
YH		 2343 }
2344
1da177e4 2345 switch(dev->type) {
0be669bb 2346#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2347 case ARPHRD_SIT:
2348 addrconf_sit_config(dev);
2349 break;
0be669bb 2350#endif
1da177e4
LT		 2351 case ARPHRD_TUNNEL6:
2352 addrconf_ip6_tnl_config(dev);
2353 break;
2354 case ARPHRD_LOOPBACK:
2355 init_loopback(dev);
2356 break;
2357
2358 default:
2359 addrconf_dev_config(dev);
2360 break;
3ff50b79 2361 }
1da177e4 2362 if (idev) {
c5e33bdd
YH		 2363 if (run_pending)
2364 addrconf_dad_run(idev);
2365
1da177e4
LT		 2366 /* If the MTU changed during the interface down, when the
2367 interface up, the changed MTU must be reflected in the
2368 idev as well as routers.
2369 */
2370 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2371 rt6_mtu_change(dev, dev->mtu);
2372 idev->cnf.mtu6 = dev->mtu;
2373 }
2374 idev->tstamp = jiffies;
2375 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2376 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2377 stop IPv6 on this interface.
2378 */
2379 if (dev->mtu < IPV6_MIN_MTU)
2380 addrconf_ifdown(dev, event != NETDEV_DOWN);
2381 }
2382 break;
2383
2384 case NETDEV_CHANGEMTU:
d31c7b8f 2385 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2386 rt6_mtu_change(dev, dev->mtu);
2387 idev->cnf.mtu6 = dev->mtu;
2388 break;
2389 }
2390
d31c7b8f
EP		 2391 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2392 idev = ipv6_add_dev(dev);
2393 if (idev)
2394 break;
2395 }
2396
1da177e4
LT		 2397 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2398
2399 case NETDEV_DOWN:
2400 case NETDEV_UNREGISTER:
2401 /*
2402 * Remove all addresses from this interface.
2403 */
2404 addrconf_ifdown(dev, event != NETDEV_DOWN);
2405 break;
3c21edbd 2406
1da177e4 2407 case NETDEV_CHANGENAME:
1da177e4 2408 if (idev) {
5632c515 2409 snmp6_unregister_dev(idev);
408c4768 2410 addrconf_sysctl_unregister(idev);
f52295a9 2411 addrconf_sysctl_register(idev);
b217d616
HX		 2412 err = snmp6_register_dev(idev);
2413 if (err)
2414 return notifier_from_errno(err);
5632c515 2415 }
1da177e4 2416 break;
3ff50b79 2417 }
1da177e4
LT		 2418
2419 return NOTIFY_OK;
2420}
2421
2422/*
2423 * addrconf module should be notified of a device going up
2424 */
2425static struct notifier_block ipv6_dev_notf = {
2426 .notifier_call = addrconf_notify,
2427 .priority = 0
2428};
2429
2430static int addrconf_ifdown(struct net_device *dev, int how)
2431{
2432 struct inet6_dev *idev;
2433 struct inet6_ifaddr *ifa, **bifa;
2434 int i;
2435
2436 ASSERT_RTNL();
2437
2774c7ab 2438 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2439 how = 0;
2440
2441 rt6_ifdown(dev);
2442 neigh_ifdown(&nd_tbl, dev);
2443
2444 idev = __in6_dev_get(dev);
2445 if (idev == NULL)
2446 return -ENODEV;
2447
2448 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2449 Do not dev_put!
1da177e4
LT		 2450 */
2451 if (how == 1) {
1da177e4 2452 idev->dead = 1;
8814c4b5
YH		 2453
2454 /* protected by rtnl_lock */
2455 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2456
2457 /* Step 1.5: remove snmp6 entry */
2458 snmp6_unregister_dev(idev);
2459
2460 }
2461
2462 /* Step 2: clear hash table */
2463 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2464 bifa = &inet6_addr_lst[i];
2465
2466 write_lock_bh(&addrconf_hash_lock);
2467 while ((ifa = *bifa) != NULL) {
2468 if (ifa->idev == idev) {
2469 *bifa = ifa->lst_next;
2470 ifa->lst_next = NULL;
2471 addrconf_del_timer(ifa);
2472 in6_ifa_put(ifa);
2473 continue;
2474 }
2475 bifa = &ifa->lst_next;
2476 }
2477 write_unlock_bh(&addrconf_hash_lock);
2478 }
2479
2480 write_lock_bh(&idev->lock);
2481
2482 /* Step 3: clear flags for stateless addrconf */
2483 if (how != 1)
3c21edbd 2484 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2485
2486 /* Step 4: clear address list */
2487#ifdef CONFIG_IPV6_PRIVACY
2488 if (how == 1 && del_timer(&idev->regen_timer))
2489 in6_dev_put(idev);
2490
2491 /* clear tempaddr list */
2492 while ((ifa = idev->tempaddr_list) != NULL) {
2493 idev->tempaddr_list = ifa->tmp_next;
2494 ifa->tmp_next = NULL;
2495 ifa->dead = 1;
2496 write_unlock_bh(&idev->lock);
2497 spin_lock_bh(&ifa->lock);
2498
2499 if (ifa->ifpub) {
2500 in6_ifa_put(ifa->ifpub);
2501 ifa->ifpub = NULL;
2502 }
2503 spin_unlock_bh(&ifa->lock);
2504 in6_ifa_put(ifa);
2505 write_lock_bh(&idev->lock);
2506 }
2507#endif
2508 while ((ifa = idev->addr_list) != NULL) {
2509 idev->addr_list = ifa->if_next;
2510 ifa->if_next = NULL;
2511 ifa->dead = 1;
2512 addrconf_del_timer(ifa);
2513 write_unlock_bh(&idev->lock);
2514
2515 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2516 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2517 in6_ifa_put(ifa);
2518
2519 write_lock_bh(&idev->lock);
2520 }
2521 write_unlock_bh(&idev->lock);
2522
2523 /* Step 5: Discard multicast list */
2524
2525 if (how == 1)
2526 ipv6_mc_destroy_dev(idev);
2527 else
2528 ipv6_mc_down(idev);
2529
1da177e4 2530 idev->tstamp = jiffies;
1ab1457c 2531
1da177e4
LT		 2532 /* Shot the device (if unregistered) */
2533
2534 if (how == 1) {
408c4768 2535 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2536 neigh_parms_release(&nd_tbl, idev->nd_parms);
2537 neigh_ifdown(&nd_tbl, dev);
2538 in6_dev_put(idev);
2539 }
2540 return 0;
2541}
2542
2543static void addrconf_rs_timer(unsigned long data)
2544{
2545 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2546
2547 if (ifp->idev->cnf.forwarding)
2548 goto out;
2549
2550 if (ifp->idev->if_flags & IF_RA_RCVD) {
2551 /*
2552 * Announcement received after solicitation
2553 * was sent
2554 */
2555 goto out;
2556 }
2557
2558 spin_lock(&ifp->lock);
2559 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2560 struct in6_addr all_routers;
2561
2562 /* The wait after the last probe can be shorter */
2563 addrconf_mod_timer(ifp, AC_RS,
2564 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2565 ifp->idev->cnf.rtr_solicit_delay :
2566 ifp->idev->cnf.rtr_solicit_interval);
2567 spin_unlock(&ifp->lock);
2568
2569 ipv6_addr_all_routers(&all_routers);
2570
2571 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2572 } else {
2573 spin_unlock(&ifp->lock);
2574 /*
2575 * Note: we do not support deprecated "all on-link"
2576 * assumption any longer.
2577 */
2578 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2579 ifp->idev->dev->name);
2580 }
2581
2582out:
2583 in6_ifa_put(ifp);
2584}
2585
2586/*
2587 * Duplicate Address Detection
2588 */
3c21edbd
YH		 2589static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2590{
2591 unsigned long rand_num;
2592 struct inet6_dev *idev = ifp->idev;
2593
95c385b4
NH		 2594 if (ifp->flags & IFA_F_OPTIMISTIC)
2595 rand_num = 0;
2596 else
2597 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2598
3c21edbd
YH		 2599 ifp->probes = idev->cnf.dad_transmits;
2600 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2601}
2602
e431b8c0 2603static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2604{
2605 struct inet6_dev *idev = ifp->idev;
2606 struct net_device *dev = idev->dev;
1da177e4
LT		 2607
2608 addrconf_join_solict(dev, &ifp->addr);
2609
1da177e4 2610 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2611
2612 read_lock_bh(&idev->lock);
2613 if (ifp->dead)
2614 goto out;
2615 spin_lock_bh(&ifp->lock);
2616
2617 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2618 !(ifp->flags&IFA_F_TENTATIVE) ||
2619 ifp->flags & IFA_F_NODAD) {
95c385b4 2620 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2621 spin_unlock_bh(&ifp->lock);
2622 read_unlock_bh(&idev->lock);
2623
2624 addrconf_dad_completed(ifp);
2625 return;
2626 }
2627
6732bade 2628 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2629 spin_unlock_bh(&ifp->lock);
6732bade 2630 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2631 /*
2632 * If the defice is not ready:
2633 * - keep it tentative if it is a permanent address.
2634 * - otherwise, kill it.
2635 */
2636 in6_ifa_hold(ifp);
2637 addrconf_dad_stop(ifp);
6732bade 2638 return;
3c21edbd 2639 }
95c385b4
NH		 2640
2641 /*
2642 * Optimistic nodes can start receiving
2643 * Frames right away
2644 */
2645 if(ifp->flags & IFA_F_OPTIMISTIC)
2646 ip6_ins_rt(ifp->rt);
2647
6732bade
YH		 2648 addrconf_dad_kick(ifp);
2649 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2650out:
2651 read_unlock_bh(&idev->lock);
2652}
2653
2654static void addrconf_dad_timer(unsigned long data)
2655{
2656 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2657 struct inet6_dev *idev = ifp->idev;
2658 struct in6_addr unspec;
2659 struct in6_addr mcaddr;
2660
2661 read_lock_bh(&idev->lock);
2662 if (idev->dead) {
2663 read_unlock_bh(&idev->lock);
2664 goto out;
2665 }
2666 spin_lock_bh(&ifp->lock);
2667 if (ifp->probes == 0) {
2668 /*
2669 * DAD was successful
2670 */
2671
95c385b4 2672 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2673 spin_unlock_bh(&ifp->lock);
2674 read_unlock_bh(&idev->lock);
2675
2676 addrconf_dad_completed(ifp);
2677
2678 goto out;
2679 }
2680
2681 ifp->probes--;
2682 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2683 spin_unlock_bh(&ifp->lock);
2684 read_unlock_bh(&idev->lock);
2685
2686 /* send a neighbour solicitation for our addr */
2687 memset(&unspec, 0, sizeof(unspec));
2688 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2689 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2690out:
2691 in6_ifa_put(ifp);
2692}
2693
2694static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2695{
2696 struct net_device * dev = ifp->idev->dev;
2697
2698 /*
2699 * Configure the address for reception. Now it is valid.
2700 */
2701
2702 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2703
2704 /* If added prefix is link local and forwarding is off,
2705 start sending router solicitations.
2706 */
2707
2708 if (ifp->idev->cnf.forwarding == 0 &&
2709 ifp->idev->cnf.rtr_solicits > 0 &&
2710 (dev->flags&IFF_LOOPBACK) == 0 &&
2711 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2712 struct in6_addr all_routers;
2713
2714 ipv6_addr_all_routers(&all_routers);
2715
2716 /*
2717 * If a host as already performed a random delay
2718 * [...] as part of DAD [...] there is no need
2719 * to delay again before sending the first RS
2720 */
2721 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2722
2723 spin_lock_bh(&ifp->lock);
2724 ifp->probes = 1;
2725 ifp->idev->if_flags |= IF_RS_SENT;
2726 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2727 spin_unlock_bh(&ifp->lock);
2728 }
2729}
2730
c5e33bdd
YH		 2731static void addrconf_dad_run(struct inet6_dev *idev) {
2732 struct inet6_ifaddr *ifp;
2733
2734 read_lock_bh(&idev->lock);
2735 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2736 spin_lock_bh(&ifp->lock);
2737 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2738 spin_unlock_bh(&ifp->lock);
2739 continue;
2740 }
2741 spin_unlock_bh(&ifp->lock);
2742 addrconf_dad_kick(ifp);
2743 }
2744 read_unlock_bh(&idev->lock);
2745}
2746
1da177e4
LT		 2747#ifdef CONFIG_PROC_FS
2748struct if6_iter_state {
3c40090a 2749 struct seq_net_private p;
1da177e4
LT		 2750 int bucket;
2751};
2752
2753static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2754{
2755 struct inet6_ifaddr *ifa = NULL;
2756 struct if6_iter_state *state = seq->private;
3c40090a 2757 struct net *net = state->p.net;
1da177e4
LT		 2758
2759 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2760 ifa = inet6_addr_lst[state->bucket];
3c40090a
DL		 2761
2762 while (ifa && ifa->idev->dev->nd_net != net)
2763 ifa = ifa->lst_next;
1da177e4
LT		 2764 if (ifa)
2765 break;
2766 }
2767 return ifa;
2768}
2769
2770static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2771{
2772 struct if6_iter_state *state = seq->private;
3c40090a 2773 struct net *net = state->p.net;
1da177e4
LT		 2774
2775 ifa = ifa->lst_next;
2776try_again:
3c40090a
DL		 2777 if (ifa) {
2778 if (ifa->idev->dev->nd_net != net) {
2779 ifa = ifa->lst_next;
2780 goto try_again;
2781 }
2782 }
2783
1da177e4
LT		 2784 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2785 ifa = inet6_addr_lst[state->bucket];
2786 goto try_again;
2787 }
3c40090a 2788
1da177e4
LT		 2789 return ifa;
2790}
2791
2792static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2793{
2794 struct inet6_ifaddr *ifa = if6_get_first(seq);
2795
2796 if (ifa)
2797 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2798 --pos;
2799 return pos ? NULL : ifa;
2800}
2801
2802static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2803 __acquires(addrconf_hash_lock)
1da177e4
LT		 2804{
2805 read_lock_bh(&addrconf_hash_lock);
2806 return if6_get_idx(seq, *pos);
2807}
2808
2809static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2810{
2811 struct inet6_ifaddr *ifa;
2812
2813 ifa = if6_get_next(seq, v);
2814 ++*pos;
2815 return ifa;
2816}
2817
2818static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2819 __releases(addrconf_hash_lock)
1da177e4
LT		 2820{
2821 read_unlock_bh(&addrconf_hash_lock);
2822}
2823
2824static int if6_seq_show(struct seq_file *seq, void *v)
2825{
2826 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2827 seq_printf(seq,
9343e79a 2828 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2829 NIP6(ifp->addr),
2830 ifp->idev->dev->ifindex,
2831 ifp->prefix_len,
2832 ifp->scope,
2833 ifp->flags,
2834 ifp->idev->dev->name);
2835 return 0;
2836}
2837
56b3d975 2838static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2839 .start = if6_seq_start,
2840 .next = if6_seq_next,
2841 .show = if6_seq_show,
2842 .stop = if6_seq_stop,
2843};
2844
2845static int if6_seq_open(struct inode *inode, struct file *file)
2846{
3c40090a
DL		 2847 return seq_open_net(inode, file, &if6_seq_ops,
2848 sizeof(struct if6_iter_state));
1da177e4
LT		 2849}
2850
9a32144e 2851static const struct file_operations if6_fops = {
1da177e4
LT		 2852 .owner = THIS_MODULE,
2853 .open = if6_seq_open,
2854 .read = seq_read,
2855 .llseek = seq_lseek,
3c40090a 2856 .release = seq_release_net,
1da177e4
LT		 2857};
2858
3c40090a 2859static int if6_proc_net_init(struct net *net)
1da177e4 2860{
3c40090a 2861 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2862 return -ENOMEM;
2863 return 0;
2864}
2865
3c40090a
DL		 2866static void if6_proc_net_exit(struct net *net)
2867{
2868 proc_net_remove(net, "if_inet6");
2869}
2870
2871static struct pernet_operations if6_proc_net_ops = {
2872 .init = if6_proc_net_init,
2873 .exit = if6_proc_net_exit,
2874};
2875
2876int __init if6_proc_init(void)
2877{
2878 return register_pernet_subsys(&if6_proc_net_ops);
2879}
2880
1da177e4
LT		 2881void if6_proc_exit(void)
2882{
3c40090a 2883 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2884}
2885#endif /* CONFIG_PROC_FS */
2886
59fbb3a6 2887#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2888/* Check if address is a home address configured on any interface. */
389f6612 2889int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2890{
2891 int ret = 0;
2892 struct inet6_ifaddr * ifp;
2893 u8 hash = ipv6_addr_hash(addr);
2894 read_lock_bh(&addrconf_hash_lock);
2895 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
389f6612
DL		 2896 if (ifp->idev->dev->nd_net != net)
2897 continue;
3b9f9a1c
NT		 2898 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2899 (ifp->flags & IFA_F_HOMEADDRESS)) {
2900 ret = 1;
2901 break;
2902 }
2903 }
2904 read_unlock_bh(&addrconf_hash_lock);
2905 return ret;
2906}
2907#endif
2908
1da177e4
LT		 2909/*
2910 * Periodic address status verification
2911 */
2912
2913static void addrconf_verify(unsigned long foo)
2914{
2915 struct inet6_ifaddr *ifp;
2916 unsigned long now, next;
2917 int i;
2918
2919 spin_lock_bh(&addrconf_verify_lock);
2920 now = jiffies;
2921 next = now + ADDR_CHECK_FREQUENCY;
2922
2923 del_timer(&addr_chk_timer);
2924
2925 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2926
2927restart:
5d5780df 2928 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2929 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2930 unsigned long age;
2931#ifdef CONFIG_IPV6_PRIVACY
2932 unsigned long regen_advance;
2933#endif
2934
2935 if (ifp->flags & IFA_F_PERMANENT)
2936 continue;
2937
2938 spin_lock(&ifp->lock);
2939 age = (now - ifp->tstamp) / HZ;
2940
2941#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2942 regen_advance = ifp->idev->cnf.regen_max_retry *
2943 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2944 ifp->idev->nd_parms->retrans_time / HZ;
2945#endif
2946
8f27ebb9
YH		 2947 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2948 age >= ifp->valid_lft) {
1da177e4
LT		 2949 spin_unlock(&ifp->lock);
2950 in6_ifa_hold(ifp);
5d5780df 2951 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2952 ipv6_del_addr(ifp);
2953 goto restart;
8f27ebb9
YH		 2954 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2955 spin_unlock(&ifp->lock);
2956 continue;
1da177e4
LT		 2957 } else if (age >= ifp->prefered_lft) {
2958 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2959 int deprecate = 0;
2960
2961 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2962 deprecate = 1;
2963 ifp->flags |= IFA_F_DEPRECATED;
2964 }
2965
2966 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2967 next = ifp->tstamp + ifp->valid_lft * HZ;
2968
2969 spin_unlock(&ifp->lock);
2970
2971 if (deprecate) {
2972 in6_ifa_hold(ifp);
5d5780df 2973 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2974
2975 ipv6_ifa_notify(0, ifp);
2976 in6_ifa_put(ifp);
2977 goto restart;
2978 }
2979#ifdef CONFIG_IPV6_PRIVACY
2980 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2981 !(ifp->flags&IFA_F_TENTATIVE)) {
2982 if (age >= ifp->prefered_lft - regen_advance) {
2983 struct inet6_ifaddr *ifpub = ifp->ifpub;
2984 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2985 next = ifp->tstamp + ifp->prefered_lft * HZ;
2986 if (!ifp->regen_count && ifpub) {
2987 ifp->regen_count++;
2988 in6_ifa_hold(ifp);
2989 in6_ifa_hold(ifpub);
2990 spin_unlock(&ifp->lock);
5d5780df 2991 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2992 spin_lock(&ifpub->lock);
2993 ifpub->regen_count = 0;
2994 spin_unlock(&ifpub->lock);
1da177e4
LT		 2995 ipv6_create_tempaddr(ifpub, ifp);
2996 in6_ifa_put(ifpub);
2997 in6_ifa_put(ifp);
2998 goto restart;
2999 }
3000 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3001 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3002 spin_unlock(&ifp->lock);
3003#endif
3004 } else {
3005 /* ifp->prefered_lft <= ifp->valid_lft */
3006 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3007 next = ifp->tstamp + ifp->prefered_lft * HZ;
3008 spin_unlock(&ifp->lock);
3009 }
3010 }
5d5780df 3011 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3012 }
3013
3014 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3015 add_timer(&addr_chk_timer);
3016 spin_unlock_bh(&addrconf_verify_lock);
3017}
3018
461d8837
TG		 3019static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3020{
3021 struct in6_addr *pfx = NULL;
3022
3023 if (addr)
3024 pfx = nla_data(addr);
3025
3026 if (local) {
3027 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3028 pfx = NULL;
3029 else
3030 pfx = nla_data(local);
3031 }
3032
3033 return pfx;
3034}
3035
ef7c79ed 3036static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3037 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3038 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3039 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3040};
3041
1da177e4
LT		 3042static int
3043inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3044{
b854272b 3045 struct net *net = skb->sk->sk_net;
b933f716
TG		 3046 struct ifaddrmsg *ifm;
3047 struct nlattr *tb[IFA_MAX+1];
1da177e4 3048 struct in6_addr *pfx;
b933f716 3049 int err;
1da177e4 3050
b854272b
DL		 3051 if (net != &init_net)
3052 return -EINVAL;
3053
b933f716
TG		 3054 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3055 if (err < 0)
3056 return err;
3057
3058 ifm = nlmsg_data(nlh);
3059 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3060 if (pfx == NULL)
3061 return -EINVAL;
3062
3063 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3064}
3065
55ebaef1
NT		 3066static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3067 u32 prefered_lft, u32 valid_lft)
081bba5b 3068{
46d48046
YH		 3069 u32 flags = RTF_EXPIRES;
3070
081bba5b
NT		 3071 if (!valid_lft || (prefered_lft > valid_lft))
3072 return -EINVAL;
3073
46d48046 3074 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3075 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3076 flags = 0;
3077 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3078 valid_lft = 0x7FFFFFFF/HZ;
3079
3080 if (prefered_lft == 0)
55ebaef1 3081 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3082 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3083 (prefered_lft != INFINITY_LIFE_TIME))
3084 prefered_lft = 0x7FFFFFFF/HZ;
3085
3086 spin_lock_bh(&ifp->lock);
3b9f9a1c 3087 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3088 ifp->tstamp = jiffies;
3089 ifp->valid_lft = valid_lft;
3090 ifp->prefered_lft = prefered_lft;
3091
3092 spin_unlock_bh(&ifp->lock);
3093 if (!(ifp->flags&IFA_F_TENTATIVE))
3094 ipv6_ifa_notify(0, ifp);
081bba5b 3095
46d48046
YH		 3096 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3097 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3098 addrconf_verify(0);
3099
3100 return 0;
3101}
3102
1da177e4
LT		 3103static int
3104inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3105{
b854272b 3106 struct net *net = skb->sk->sk_net;
461d8837
TG		 3107 struct ifaddrmsg *ifm;
3108 struct nlattr *tb[IFA_MAX+1];
1da177e4 3109 struct in6_addr *pfx;
7198f8ce
TG		 3110 struct inet6_ifaddr *ifa;
3111 struct net_device *dev;
55ebaef1
NT		 3112 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3113 u8 ifa_flags;
461d8837 3114 int err;
1da177e4 3115
b854272b
DL		 3116 if (net != &init_net)
3117 return -EINVAL;
3118
461d8837
TG		 3119 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3120 if (err < 0)
3121 return err;
3122
3123 ifm = nlmsg_data(nlh);
3124 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3125 if (pfx == NULL)
3126 return -EINVAL;
3127
461d8837 3128 if (tb[IFA_CACHEINFO]) {
0778769d 3129 struct ifa_cacheinfo *ci;
461d8837
TG		 3130
3131 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3132 valid_lft = ci->ifa_valid;
461d8837
TG		 3133 preferred_lft = ci->ifa_prefered;
3134 } else {
3135 preferred_lft = INFINITY_LIFE_TIME;
3136 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3137 }
3138
881d966b 3139 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3140 if (dev == NULL)
3141 return -ENODEV;
3142
55ebaef1 3143 /* We ignore other flags so far. */
3b9f9a1c 3144 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3145
1cab3da6 3146 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3147 if (ifa == NULL) {
3148 /*
3149 * It would be best to check for !NLM_F_CREATE here but
3150 * userspace alreay relies on not having to provide this.
3151 */
3152 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3153 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3154 }
3155
7198f8ce
TG		 3156 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3157 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3158 err = -EEXIST;
3159 else
55ebaef1 3160 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3161
3162 in6_ifa_put(ifa);
3163
3164 return err;
1da177e4
LT		 3165}
3166
101bb229
TG		 3167static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3168 u8 scope, int ifindex)
3169{
3170 struct ifaddrmsg *ifm;
3171
3172 ifm = nlmsg_data(nlh);
3173 ifm->ifa_family = AF_INET6;
3174 ifm->ifa_prefixlen = prefixlen;
3175 ifm->ifa_flags = flags;
3176 ifm->ifa_scope = scope;
3177 ifm->ifa_index = ifindex;
3178}
3179
85486af0
TG		 3180static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3181 unsigned long tstamp, u32 preferred, u32 valid)
3182{
3183 struct ifa_cacheinfo ci;
3184
3185 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3186 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3187 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3188 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3189 ci.ifa_prefered = preferred;
3190 ci.ifa_valid = valid;
3191
3192 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3193}
3194
101bb229
TG		 3195static inline int rt_scope(int ifa_scope)
3196{
3197 if (ifa_scope & IFA_HOST)
3198 return RT_SCOPE_HOST;
3199 else if (ifa_scope & IFA_LINK)
3200 return RT_SCOPE_LINK;
3201 else if (ifa_scope & IFA_SITE)
3202 return RT_SCOPE_SITE;
3203 else
3204 return RT_SCOPE_UNIVERSE;
3205}
3206
0ab6803b
TG		 3207static inline int inet6_ifaddr_msgsize(void)
3208{
339bf98f
TG		 3209 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3210 + nla_total_size(16) /* IFA_ADDRESS */
3211 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3212}
c5396a31 3213
1da177e4 3214static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3215 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3216{
1da177e4 3217 struct nlmsghdr *nlh;
85486af0 3218 u32 preferred, valid;
1da177e4 3219
0ab6803b
TG		 3220 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3221 if (nlh == NULL)
26932566 3222 return -EMSGSIZE;
0ab6803b 3223
101bb229
TG		 3224 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3225 ifa->idev->dev->ifindex);
3226
1da177e4 3227 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3228 preferred = ifa->prefered_lft;
3229 valid = ifa->valid_lft;
3230 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3231 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3232 preferred -= tval;
3233 if (valid != INFINITY_LIFE_TIME)
3234 valid -= tval;
1da177e4
LT		 3235 }
3236 } else {
85486af0
TG		 3237 preferred = INFINITY_LIFE_TIME;
3238 valid = INFINITY_LIFE_TIME;
3239 }
3240
0ab6803b 3241 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3242 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3243 nlmsg_cancel(skb, nlh);
3244 return -EMSGSIZE;
3245 }
1da177e4 3246
0ab6803b 3247 return nlmsg_end(skb, nlh);
1da177e4
LT		 3248}
3249
3250static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3251 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3252{
1da177e4 3253 struct nlmsghdr *nlh;
101bb229
TG		 3254 u8 scope = RT_SCOPE_UNIVERSE;
3255 int ifindex = ifmca->idev->dev->ifindex;
3256
3257 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3258 scope = RT_SCOPE_SITE;
1da177e4 3259
0ab6803b
TG		 3260 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3261 if (nlh == NULL)
26932566 3262 return -EMSGSIZE;
85486af0 3263
0ab6803b
TG		 3264 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3265 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3266 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3267 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3268 nlmsg_cancel(skb, nlh);
3269 return -EMSGSIZE;
3270 }
85486af0 3271
0ab6803b 3272 return nlmsg_end(skb, nlh);
1da177e4
LT		 3273}
3274
3275static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3276 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3277{
1da177e4 3278 struct nlmsghdr *nlh;
101bb229
TG		 3279 u8 scope = RT_SCOPE_UNIVERSE;
3280 int ifindex = ifaca->aca_idev->dev->ifindex;
3281
3282 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3283 scope = RT_SCOPE_SITE;
1da177e4 3284
0ab6803b
TG		 3285 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3286 if (nlh == NULL)
26932566 3287 return -EMSGSIZE;
85486af0 3288
0ab6803b
TG		 3289 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3290 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3291 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3292 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3293 nlmsg_cancel(skb, nlh);
3294 return -EMSGSIZE;
3295 }
1da177e4 3296
0ab6803b 3297 return nlmsg_end(skb, nlh);
1da177e4
LT		 3298}
3299
3300enum addr_type_t
3301{
3302 UNICAST_ADDR,
3303 MULTICAST_ADDR,
3304 ANYCAST_ADDR,
3305};
3306
3307static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3308 enum addr_type_t type)
3309{
3310 int idx, ip_idx;
3311 int s_idx, s_ip_idx;
3312 int err = 1;
3313 struct net_device *dev;
3314 struct inet6_dev *idev = NULL;
3315 struct inet6_ifaddr *ifa;
3316 struct ifmcaddr6 *ifmca;
3317 struct ifacaddr6 *ifaca;
3318
3319 s_idx = cb->args[0];
3320 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3321
7562f876 3322 idx = 0;
881d966b 3323 for_each_netdev(&init_net, dev) {
1da177e4 3324 if (idx < s_idx)
7562f876 3325 goto cont;
1da177e4
LT		 3326 if (idx > s_idx)
3327 s_ip_idx = 0;
3328 ip_idx = 0;
3329 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3330 goto cont;
1da177e4
LT		 3331 read_lock_bh(&idev->lock);
3332 switch (type) {
3333 case UNICAST_ADDR:
ae9cda5d 3334 /* unicast address incl. temp addr */
1da177e4
LT		 3335 for (ifa = idev->addr_list; ifa;
3336 ifa = ifa->if_next, ip_idx++) {
3337 if (ip_idx < s_ip_idx)
3338 continue;
5d5619b4
YH		 3339 err = inet6_fill_ifaddr(skb, ifa,
3340 NETLINK_CB(cb->skb).pid,
3341 cb->nlh->nlmsg_seq,
3342 RTM_NEWADDR,
3343 NLM_F_MULTI);
1da177e4 3344 }
1da177e4
LT		 3345 break;
3346 case MULTICAST_ADDR:
3347 /* multicast address */
1ab1457c 3348 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3349 ifmca = ifmca->next, ip_idx++) {
3350 if (ip_idx < s_ip_idx)
3351 continue;
5d5619b4
YH		 3352 err = inet6_fill_ifmcaddr(skb, ifmca,
3353 NETLINK_CB(cb->skb).pid,
3354 cb->nlh->nlmsg_seq,
3355 RTM_GETMULTICAST,
3356 NLM_F_MULTI);
1da177e4
LT		 3357 }
3358 break;
3359 case ANYCAST_ADDR:
3360 /* anycast address */
3361 for (ifaca = idev->ac_list; ifaca;
3362 ifaca = ifaca->aca_next, ip_idx++) {
3363 if (ip_idx < s_ip_idx)
3364 continue;
5d5619b4
YH		 3365 err = inet6_fill_ifacaddr(skb, ifaca,
3366 NETLINK_CB(cb->skb).pid,
3367 cb->nlh->nlmsg_seq,
3368 RTM_GETANYCAST,
3369 NLM_F_MULTI);
1da177e4
LT		 3370 }
3371 break;
3372 default:
3373 break;
3374 }
3375 read_unlock_bh(&idev->lock);
3376 in6_dev_put(idev);
5d5619b4
YH		 3377
3378 if (err <= 0)
3379 break;
7562f876
PE		 3380cont:
3381 idx++;
1da177e4 3382 }
1da177e4
LT		 3383 cb->args[0] = idx;
3384 cb->args[1] = ip_idx;
3385 return skb->len;
3386}
3387
3388static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3389{
b854272b 3390 struct net *net = skb->sk->sk_net;
1da177e4 3391 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3392
3393 if (net != &init_net)
3394 return 0;
3395
1da177e4
LT		 3396 return inet6_dump_addr(skb, cb, type);
3397}
3398
3399static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3400{
b854272b 3401 struct net *net = skb->sk->sk_net;
1da177e4 3402 enum addr_type_t type = MULTICAST_ADDR;
b854272b
DL		 3403
3404 if (net != &init_net)
3405 return 0;
3406
1da177e4
LT		 3407 return inet6_dump_addr(skb, cb, type);
3408}
3409
3410
3411static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3412{
b854272b 3413 struct net *net = skb->sk->sk_net;
1da177e4 3414 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3415
3416 if (net != &init_net)
3417 return 0;
3418
1da177e4
LT		 3419 return inet6_dump_addr(skb, cb, type);
3420}
3421
1b29fc2c
TG		 3422static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3423 void *arg)
6c223828 3424{
b854272b 3425 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3426 struct ifaddrmsg *ifm;
3427 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3428 struct in6_addr *addr = NULL;
3429 struct net_device *dev = NULL;
3430 struct inet6_ifaddr *ifa;
3431 struct sk_buff *skb;
6c223828
NT		 3432 int err;
3433
b854272b
DL		 3434 if (net != &init_net)
3435 return -EINVAL;
3436
1b29fc2c
TG		 3437 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3438 if (err < 0)
3439 goto errout;
3440
3441 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3442 if (addr == NULL) {
3443 err = -EINVAL;
3444 goto errout;
6c223828 3445 }
6c223828 3446
1b29fc2c 3447 ifm = nlmsg_data(nlh);
6c223828 3448 if (ifm->ifa_index)
881d966b 3449 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3450
1cab3da6 3451 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3452 err = -EADDRNOTAVAIL;
3453 goto errout;
3454 }
6c223828 3455
0ab6803b 3456 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3457 err = -ENOBUFS;
1b29fc2c 3458 goto errout_ifa;
6c223828
NT		 3459 }
3460
6c223828
NT		 3461 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3462 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3463 if (err < 0) {
3464 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3465 WARN_ON(err == -EMSGSIZE);
3466 kfree_skb(skb);
3467 goto errout_ifa;
3468 }
97c53cac 3469 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3470errout_ifa:
6c223828 3471 in6_ifa_put(ifa);
1b29fc2c 3472errout:
6c223828 3473 return err;
6c223828
NT		 3474}
3475
1da177e4
LT		 3476static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3477{
3478 struct sk_buff *skb;
5d620266 3479 int err = -ENOBUFS;
1da177e4 3480
0ab6803b 3481 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3482 if (skb == NULL)
3483 goto errout;
3484
3485 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3486 if (err < 0) {
3487 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3488 WARN_ON(err == -EMSGSIZE);
3489 kfree_skb(skb);
3490 goto errout;
3491 }
97c53cac 3492 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3493errout:
3494 if (err < 0)
97c53cac 3495 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3496}
3497
b6f99a21 3498static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3499 __s32 *array, int bytes)
3500{
04561c1f
TG		 3501 BUG_ON(bytes < (DEVCONF_MAX * 4));
3502
1da177e4
LT		 3503 memset(array, 0, bytes);
3504 array[DEVCONF_FORWARDING] = cnf->forwarding;
3505 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3506 array[DEVCONF_MTU6] = cnf->mtu6;
3507 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3508 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3509 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3510 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3511 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3512 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3513 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3514 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3515#ifdef CONFIG_IPV6_PRIVACY
3516 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3517 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3518 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3519 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3520 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3521#endif
3522 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3523 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3524 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3525#ifdef CONFIG_IPV6_ROUTER_PREF
3526 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3527 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3528#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3529 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3530#endif
930d6ff2 3531#endif
fbea49e1 3532 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3533 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3534#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3535 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3536#endif
1da177e4
LT		 3537}
3538
339bf98f
TG		 3539static inline size_t inet6_if_nlmsg_size(void)
3540{
3541 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3542 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3543 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3544 + nla_total_size(4) /* IFLA_MTU */
3545 + nla_total_size(4) /* IFLA_LINK */
3546 + nla_total_size( /* IFLA_PROTINFO */
3547 nla_total_size(4) /* IFLA_INET6_FLAGS */
3548 + nla_total_size(sizeof(struct ifla_cacheinfo))
3549 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3550 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3551 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3552 );
3553}
c5396a31 3554
7f7d9a6b
HX		 3555static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3556 int bytes)
3557{
3558 int i;
3559 int pad = bytes - sizeof(u64) * items;
3560 BUG_ON(pad < 0);
3561
3562 /* Use put_unaligned() because stats may not be aligned for u64. */
3563 put_unaligned(items, &stats[0]);
3564 for (i = 1; i < items; i++)
3565 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3566
3567 memset(&stats[items], 0, pad);
3568}
3569
3570static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3571 int bytes)
3572{
3573 switch(attrtype) {
3574 case IFLA_INET6_STATS:
3575 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3576 break;
3577 case IFLA_INET6_ICMP6STATS:
3578 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3579 break;
3580 }
3581}
3582
1ab1457c 3583static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3584 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3585{
04561c1f 3586 struct net_device *dev = idev->dev;
bf99f1bd 3587 struct nlattr *nla;
04561c1f
TG		 3588 struct ifinfomsg *hdr;
3589 struct nlmsghdr *nlh;
3590 void *protoinfo;
3591 struct ifla_cacheinfo ci;
3592
3593 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3594 if (nlh == NULL)
26932566 3595 return -EMSGSIZE;
04561c1f
TG		 3596
3597 hdr = nlmsg_data(nlh);
3598 hdr->ifi_family = AF_INET6;
3599 hdr->__ifi_pad = 0;
3600 hdr->ifi_type = dev->type;
3601 hdr->ifi_index = dev->ifindex;
3602 hdr->ifi_flags = dev_get_flags(dev);
3603 hdr->ifi_change = 0;
3604
3605 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3606
3607 if (dev->addr_len)
04561c1f 3608 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3609
04561c1f 3610 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3611 if (dev->ifindex != dev->iflink)
04561c1f 3612 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3613
04561c1f
TG		 3614 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3615 if (protoinfo == NULL)
3616 goto nla_put_failure;
1da177e4 3617
04561c1f 3618 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3619
1da177e4
LT		 3620 ci.max_reasm_len = IPV6_MAXPLEN;
3621 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3622 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3623 ci.reachable_time = idev->nd_parms->reachable_time;
3624 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3625 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3626
bf99f1bd
YH		 3627 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3628 if (nla == NULL)
04561c1f 3629 goto nla_put_failure;
bf99f1bd 3630 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3631
bf99f1bd
YH		 3632 /* XXX - MC not implemented */
3633
3634 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3635 if (nla == NULL)
3636 goto nla_put_failure;
3637 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3638
3639 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3640 if (nla == NULL)
3641 goto nla_put_failure;
3642 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3643
04561c1f
TG		 3644 nla_nest_end(skb, protoinfo);
3645 return nlmsg_end(skb, nlh);
1da177e4 3646
04561c1f 3647nla_put_failure:
26932566
PM		 3648 nlmsg_cancel(skb, nlh);
3649 return -EMSGSIZE;
1da177e4
LT		 3650}
3651
3652static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3653{
b854272b 3654 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3655 int idx, err;
3656 int s_idx = cb->args[0];
3657 struct net_device *dev;
3658 struct inet6_dev *idev;
3659
b854272b
DL		 3660 if (net != &init_net)
3661 return 0;
3662
1da177e4 3663 read_lock(&dev_base_lock);
7562f876 3664 idx = 0;
881d966b 3665 for_each_netdev(&init_net, dev) {
1da177e4 3666 if (idx < s_idx)
7562f876 3667 goto cont;
1da177e4 3668 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3669 goto cont;
1ab1457c 3670 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3671 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3672 in6_dev_put(idev);
3673 if (err <= 0)
3674 break;
7562f876
PE		 3675cont:
3676 idx++;
1da177e4
LT		 3677 }
3678 read_unlock(&dev_base_lock);
3679 cb->args[0] = idx;
3680
3681 return skb->len;
3682}
3683
3684void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3685{
3686 struct sk_buff *skb;
8d7a76c9 3687 int err = -ENOBUFS;
1ab1457c 3688
339bf98f 3689 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3690 if (skb == NULL)
3691 goto errout;
3692
3693 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3694 if (err < 0) {
3695 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3696 WARN_ON(err == -EMSGSIZE);
3697 kfree_skb(skb);
3698 goto errout;
3699 }
97c53cac 3700 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3701errout:
3702 if (err < 0)
97c53cac 3703 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3704}
3705
339bf98f
TG		 3706static inline size_t inet6_prefix_nlmsg_size(void)
3707{
3708 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3709 + nla_total_size(sizeof(struct in6_addr))
3710 + nla_total_size(sizeof(struct prefix_cacheinfo));
3711}
c5396a31 3712
1da177e4 3713static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3714 struct prefix_info *pinfo, u32 pid, u32 seq,
3715 int event, unsigned int flags)
1da177e4 3716{
6051e2f4
TG		 3717 struct prefixmsg *pmsg;
3718 struct nlmsghdr *nlh;
1da177e4
LT		 3719 struct prefix_cacheinfo ci;
3720
6051e2f4
TG		 3721 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3722 if (nlh == NULL)
26932566 3723 return -EMSGSIZE;
6051e2f4
TG		 3724
3725 pmsg = nlmsg_data(nlh);
1da177e4 3726 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3727 pmsg->prefix_pad1 = 0;
3728 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3729 pmsg->prefix_ifindex = idev->dev->ifindex;
3730 pmsg->prefix_len = pinfo->prefix_len;
3731 pmsg->prefix_type = pinfo->type;
8a47077a 3732 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3733 pmsg->prefix_flags = 0;
3734 if (pinfo->onlink)
3735 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3736 if (pinfo->autoconf)
3737 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3738
6051e2f4 3739 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3740
3741 ci.preferred_time = ntohl(pinfo->prefered);
3742 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3743 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3744
6051e2f4 3745 return nlmsg_end(skb, nlh);
1da177e4 3746
6051e2f4 3747nla_put_failure:
26932566
PM		 3748 nlmsg_cancel(skb, nlh);
3749 return -EMSGSIZE;
1da177e4
LT		 3750}
3751
1ab1457c 3752static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3753 struct prefix_info *pinfo)
3754{
3755 struct sk_buff *skb;
8c384bfa 3756 int err = -ENOBUFS;
1da177e4 3757
339bf98f 3758 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3759 if (skb == NULL)
3760 goto errout;
3761
3762 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3763 if (err < 0) {
3764 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3765 WARN_ON(err == -EMSGSIZE);
3766 kfree_skb(skb);
3767 goto errout;
3768 }
97c53cac 3769 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3770errout:
3771 if (err < 0)
97c53cac 3772 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3773}
3774
1da177e4
LT		 3775static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3776{
3777 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3778
3779 switch (event) {
3780 case RTM_NEWADDR:
95c385b4
NH		 3781 /*
3782 * If the address was optimistic
3783 * we inserted the route at the start of
3784 * our DAD process, so we don't need
3785 * to do it again
3786 */
3787 if (!(ifp->rt->rt6i_node))
3788 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3789 if (ifp->idev->cnf.forwarding)
3790 addrconf_join_anycast(ifp);
3791 break;
3792 case RTM_DELADDR:
3793 if (ifp->idev->cnf.forwarding)
3794 addrconf_leave_anycast(ifp);
3795 addrconf_leave_solict(ifp->idev, &ifp->addr);
3796 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3797 if (ip6_del_rt(ifp->rt))
1da177e4 3798 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3799 break;
3800 }
3801}
3802
3803static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3804{
8814c4b5 3805 rcu_read_lock_bh();
1da177e4
LT		 3806 if (likely(ifp->idev->dead == 0))
3807 __ipv6_ifa_notify(event, ifp);
8814c4b5 3808 rcu_read_unlock_bh();
1da177e4
LT		 3809}
3810
3811#ifdef CONFIG_SYSCTL
3812
3813static
3814int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3815 void __user *buffer, size_t *lenp, loff_t *ppos)
3816{
3817 int *valp = ctl->data;
3818 int val = *valp;
3819 int ret;
3820
3821 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3822
c8fecf22
PE		 3823 if (write)
3824 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3825 return ret;
1da177e4
LT		 3826}
3827
1ab1457c 3828static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3829 int __user *name, int nlen,
3830 void __user *oldval,
3831 size_t __user *oldlenp,
1f29bcd7 3832 void __user *newval, size_t newlen)
1da177e4
LT		 3833{
3834 int *valp = table->data;
c8fecf22 3835 int val = *valp;
1da177e4
LT		 3836 int new;
3837
3838 if (!newval || !newlen)
3839 return 0;
3840 if (newlen != sizeof(int))
3841 return -EINVAL;
3842 if (get_user(new, (int __user *)newval))
3843 return -EFAULT;
3844 if (new == *valp)
3845 return 0;
3846 if (oldval && oldlenp) {
3847 size_t len;
3848 if (get_user(len, oldlenp))
3849 return -EFAULT;
3850 if (len) {
3851 if (len > table->maxlen)
3852 len = table->maxlen;
3853 if (copy_to_user(oldval, valp, len))
3854 return -EFAULT;
3855 if (put_user(len, oldlenp))
3856 return -EFAULT;
3857 }
3858 }
3859
c8fecf22
PE		 3860 *valp = new;
3861 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3862 return 1;
3863}
3864
3865static struct addrconf_sysctl_table
3866{
3867 struct ctl_table_header *sysctl_header;
3868 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3869 char *dev_name;
ab32ea5d 3870} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3871 .sysctl_header = NULL,
3872 .addrconf_vars = {
1ab1457c 3873 {
1da177e4
LT		 3874 .ctl_name = NET_IPV6_FORWARDING,
3875 .procname = "forwarding",
1ab1457c 3876 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3877 .maxlen = sizeof(int),
3878 .mode = 0644,
1ab1457c 3879 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3880 .strategy = &addrconf_sysctl_forward_strategy,
3881 },
3882 {
3883 .ctl_name = NET_IPV6_HOP_LIMIT,
3884 .procname = "hop_limit",
1ab1457c 3885 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3886 .maxlen = sizeof(int),
3887 .mode = 0644,
3888 .proc_handler = proc_dointvec,
3889 },
3890 {
3891 .ctl_name = NET_IPV6_MTU,
3892 .procname = "mtu",
3893 .data = &ipv6_devconf.mtu6,
1ab1457c 3894 .maxlen = sizeof(int),
1da177e4 3895 .mode = 0644,
1ab1457c 3896 .proc_handler = &proc_dointvec,
1da177e4
LT		 3897 },
3898 {
3899 .ctl_name = NET_IPV6_ACCEPT_RA,
3900 .procname = "accept_ra",
1ab1457c 3901 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3902 .maxlen = sizeof(int),
3903 .mode = 0644,
1ab1457c 3904 .proc_handler = &proc_dointvec,
1da177e4
LT		 3905 },
3906 {
3907 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3908 .procname = "accept_redirects",
1ab1457c 3909 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3910 .maxlen = sizeof(int),
3911 .mode = 0644,
1ab1457c 3912 .proc_handler = &proc_dointvec,
1da177e4
LT		 3913 },
3914 {
3915 .ctl_name = NET_IPV6_AUTOCONF,
3916 .procname = "autoconf",
1ab1457c 3917 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3918 .maxlen = sizeof(int),
3919 .mode = 0644,
1ab1457c 3920 .proc_handler = &proc_dointvec,
1da177e4
LT		 3921 },
3922 {
3923 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3924 .procname = "dad_transmits",
1ab1457c 3925 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3926 .maxlen = sizeof(int),
3927 .mode = 0644,
1ab1457c 3928 .proc_handler = &proc_dointvec,
1da177e4
LT		 3929 },
3930 {
3931 .ctl_name = NET_IPV6_RTR_SOLICITS,
3932 .procname = "router_solicitations",
1ab1457c 3933 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3934 .maxlen = sizeof(int),
3935 .mode = 0644,
1ab1457c 3936 .proc_handler = &proc_dointvec,
1da177e4
LT		 3937 },
3938 {
3939 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3940 .procname = "router_solicitation_interval",
1ab1457c 3941 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3942 .maxlen = sizeof(int),
3943 .mode = 0644,
1ab1457c 3944 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3945 .strategy = &sysctl_jiffies,
3946 },
3947 {
3948 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3949 .procname = "router_solicitation_delay",
1ab1457c 3950 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3951 .maxlen = sizeof(int),
3952 .mode = 0644,
1ab1457c 3953 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3954 .strategy = &sysctl_jiffies,
3955 },
3956 {
3957 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3958 .procname = "force_mld_version",
1ab1457c 3959 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3960 .maxlen = sizeof(int),
3961 .mode = 0644,
1ab1457c 3962 .proc_handler = &proc_dointvec,
1da177e4
LT		 3963 },
3964#ifdef CONFIG_IPV6_PRIVACY
3965 {
3966 .ctl_name = NET_IPV6_USE_TEMPADDR,
3967 .procname = "use_tempaddr",
1ab1457c 3968 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3969 .maxlen = sizeof(int),
3970 .mode = 0644,
1ab1457c 3971 .proc_handler = &proc_dointvec,
1da177e4
LT		 3972 },
3973 {
3974 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3975 .procname = "temp_valid_lft",
1ab1457c 3976 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3977 .maxlen = sizeof(int),
3978 .mode = 0644,
1ab1457c 3979 .proc_handler = &proc_dointvec,
1da177e4
LT		 3980 },
3981 {
3982 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3983 .procname = "temp_prefered_lft",
1ab1457c 3984 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3985 .maxlen = sizeof(int),
3986 .mode = 0644,
1ab1457c 3987 .proc_handler = &proc_dointvec,
1da177e4
LT		 3988 },
3989 {
3990 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3991 .procname = "regen_max_retry",
1ab1457c 3992 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3993 .maxlen = sizeof(int),
3994 .mode = 0644,
1ab1457c 3995 .proc_handler = &proc_dointvec,
1da177e4
LT		 3996 },
3997 {
3998 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3999 .procname = "max_desync_factor",
1ab1457c 4000 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4001 .maxlen = sizeof(int),
4002 .mode = 0644,
1ab1457c 4003 .proc_handler = &proc_dointvec,
1da177e4
LT		 4004 },
4005#endif
4006 {
4007 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4008 .procname = "max_addresses",
4009 .data = &ipv6_devconf.max_addresses,
4010 .maxlen = sizeof(int),
4011 .mode = 0644,
4012 .proc_handler = &proc_dointvec,
4013 },
65f5c7c1
YH		 4014 {
4015 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4016 .procname = "accept_ra_defrtr",
1ab1457c 4017 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4018 .maxlen = sizeof(int),
4019 .mode = 0644,
1ab1457c 4020 .proc_handler = &proc_dointvec,
65f5c7c1 4021 },
c4fd30eb
YH		 4022 {
4023 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4024 .procname = "accept_ra_pinfo",
1ab1457c 4025 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4026 .maxlen = sizeof(int),
4027 .mode = 0644,
1ab1457c 4028 .proc_handler = &proc_dointvec,
c4fd30eb 4029 },
930d6ff2
YH		 4030#ifdef CONFIG_IPV6_ROUTER_PREF
4031 {
4032 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4033 .procname = "accept_ra_rtr_pref",
4034 .data = &ipv6_devconf.accept_ra_rtr_pref,
4035 .maxlen = sizeof(int),
4036 .mode = 0644,
4037 .proc_handler = &proc_dointvec,
4038 },
52e16356
YH		 4039 {
4040 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4041 .procname = "router_probe_interval",
4042 .data = &ipv6_devconf.rtr_probe_interval,
4043 .maxlen = sizeof(int),
4044 .mode = 0644,
4045 .proc_handler = &proc_dointvec_jiffies,
4046 .strategy = &sysctl_jiffies,
4047 },
fa03ef38 4048#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4049 {
4050 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4051 .procname = "accept_ra_rt_info_max_plen",
4052 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4053 .maxlen = sizeof(int),
4054 .mode = 0644,
4055 .proc_handler = &proc_dointvec,
4056 },
4057#endif
930d6ff2 4058#endif
fbea49e1
YH		 4059 {
4060 .ctl_name = NET_IPV6_PROXY_NDP,
4061 .procname = "proxy_ndp",
4062 .data = &ipv6_devconf.proxy_ndp,
4063 .maxlen = sizeof(int),
4064 .mode = 0644,
4065 .proc_handler = &proc_dointvec,
4066 },
0bcbc926
YH		 4067 {
4068 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4069 .procname = "accept_source_route",
4070 .data = &ipv6_devconf.accept_source_route,
4071 .maxlen = sizeof(int),
4072 .mode = 0644,
4073 .proc_handler = &proc_dointvec,
4074 },
95c385b4
NH		 4075#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4076 {
4077 .ctl_name = CTL_UNNUMBERED,
4078 .procname = "optimistic_dad",
4079 .data = &ipv6_devconf.optimistic_dad,
4080 .maxlen = sizeof(int),
4081 .mode = 0644,
4082 .proc_handler = &proc_dointvec,
4083
4084 },
4085#endif
1da177e4
LT		 4086 {
4087 .ctl_name = 0, /* sentinel */
4088 }
4089 },
1da177e4
LT		 4090};
4091
bff16c2f
PE		 4092static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4093 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4094{
4095 int i;
1da177e4 4096 struct addrconf_sysctl_table *t;
1da177e4 4097
1dab6222
PE		 4098#define ADDRCONF_CTL_PATH_DEV 3
4099
4100 struct ctl_path addrconf_ctl_path[] = {
4101 { .procname = "net", .ctl_name = CTL_NET, },
4102 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4103 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4104 { /* to be set */ },
4105 { },
4106 };
4107
4108
af879cc7 4109 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4110 if (t == NULL)
f68635e6
PE		 4111 goto out;
4112
1da177e4
LT		 4113 for (i=0; t->addrconf_vars[i].data; i++) {
4114 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4115 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4116 t->addrconf_vars[i].extra2 = net;
1da177e4 4117 }
1da177e4 4118
1ab1457c
YH		 4119 /*
4120 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4121 * by sysctl and we wouldn't want anyone to change it under our feet
4122 * (see SIOCSIFNAME).
1ab1457c 4123 */
1dab6222
PE		 4124 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4125 if (!t->dev_name)
f68635e6 4126 goto free;
1da177e4 4127
1dab6222
PE		 4128 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4129 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4130
bff16c2f 4131 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4132 t->addrconf_vars);
1da177e4
LT		 4133 if (t->sysctl_header == NULL)
4134 goto free_procname;
f68635e6
PE		 4135
4136 p->sysctl = t;
95897312 4137 return 0;
1da177e4 4138
f68635e6 4139free_procname:
1dab6222 4140 kfree(t->dev_name);
f68635e6 4141free:
1da177e4 4142 kfree(t);
f68635e6 4143out:
95897312 4144 return -ENOBUFS;
1da177e4
LT		 4145}
4146
408c4768
PE		 4147static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4148{
4149 struct addrconf_sysctl_table *t;
4150
4151 if (p->sysctl == NULL)
4152 return;
4153
4154 t = p->sysctl;
4155 p->sysctl = NULL;
4156 unregister_sysctl_table(t->sysctl_header);
4157 kfree(t->dev_name);
4158 kfree(t);
4159}
4160
f52295a9
PE		 4161static void addrconf_sysctl_register(struct inet6_dev *idev)
4162{
408c4768
PE		 4163 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4164 NET_IPV6_NEIGH, "ipv6",
4165 &ndisc_ifinfo_sysctl_change,
4166 NULL);
bff16c2f
PE		 4167 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4168 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4169}
4170
408c4768 4171static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4172{
408c4768
PE		 4173 __addrconf_sysctl_unregister(&idev->cnf);
4174 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4175}
4176
4177
4178#endif
4179
e0da5a48
PE		 4180static int addrconf_init_net(struct net *net)
4181{
4182 int err;
4183 struct ipv6_devconf *all, *dflt;
4184
4185 err = -ENOMEM;
4186 all = &ipv6_devconf;
4187 dflt = &ipv6_devconf_dflt;
4188
4189 if (net != &init_net) {
4190 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4191 if (all == NULL)
4192 goto err_alloc_all;
4193
4194 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4195 if (dflt == NULL)
4196 goto err_alloc_dflt;
4197 }
4198
4199 net->ipv6.devconf_all = all;
4200 net->ipv6.devconf_dflt = dflt;
4201
4202#ifdef CONFIG_SYSCTL
4203 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4204 NULL, all);
4205 if (err < 0)
4206 goto err_reg_all;
4207
4208 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4209 NULL, dflt);
4210 if (err < 0)
4211 goto err_reg_dflt;
4212#endif
4213 return 0;
4214
4215#ifdef CONFIG_SYSCTL
4216err_reg_dflt:
4217 __addrconf_sysctl_unregister(all);
4218err_reg_all:
4219 kfree(dflt);
4220#endif
4221err_alloc_dflt:
4222 kfree(all);
4223err_alloc_all:
4224 return err;
4225}
4226
4227static void addrconf_exit_net(struct net *net)
4228{
4229#ifdef CONFIG_SYSCTL
4230 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4231 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4232#endif
4233 if (net != &init_net) {
4234 kfree(net->ipv6.devconf_dflt);
4235 kfree(net->ipv6.devconf_all);
4236 }
4237}
4238
4239static struct pernet_operations addrconf_ops = {
4240 .init = addrconf_init_net,
4241 .exit = addrconf_exit_net,
4242};
4243
1da177e4
LT		 4244/*
4245 * Device notifier
4246 */
4247
4248int register_inet6addr_notifier(struct notifier_block *nb)
4249{
1ab1457c 4250 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4251}
4252
7159039a
YH		 4253EXPORT_SYMBOL(register_inet6addr_notifier);
4254
1da177e4
LT		 4255int unregister_inet6addr_notifier(struct notifier_block *nb)
4256{
1ab1457c 4257 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4258}
4259
7159039a
YH		 4260EXPORT_SYMBOL(unregister_inet6addr_notifier);
4261
1da177e4
LT		 4262/*
4263 * Init / cleanup code
4264 */
4265
4266int __init addrconf_init(void)
4267{
2a8cc6c8
YH		 4268 int err;
4269
4270 if ((err = ipv6_addr_label_init()) < 0) {
4271 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4272 err);
4273 return err;
4274 }
1da177e4 4275
e0da5a48
PE		 4276 register_pernet_subsys(&addrconf_ops);
4277
1da177e4
LT		 4278 /* The addrconf netdev notifier requires that loopback_dev
4279 * has it's ipv6 private information allocated and setup
4280 * before it can bring up and give link-local addresses
4281 * to other devices which are up.
4282 *
4283 * Unfortunately, loopback_dev is not necessarily the first
4284 * entry in the global dev_base list of net devices. In fact,
4285 * it is likely to be the very last entry on that list.
4286 * So this causes the notifier registry below to try and
4287 * give link-local addresses to all devices besides loopback_dev
4288 * first, then loopback_dev, which cases all the non-loopback_dev
4289 * devices to fail to get a link-local address.
4290 *
4291 * So, as a temporary fix, allocate the ipv6 structure for
4292 * loopback_dev first by hand.
4293 * Longer term, all of the dependencies ipv6 has upon the loopback
4294 * device and it being up should be removed.
4295 */
4296 rtnl_lock();
2774c7ab 4297 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4298 err = -ENOMEM;
4299 rtnl_unlock();
4300 if (err)
e0da5a48 4301 goto errlo;
1da177e4 4302
2774c7ab
EB		 4303 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4304 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4305#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4306 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4307 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4308 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4309 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4310#endif
c62dba90 4311
1da177e4
LT		 4312 register_netdevice_notifier(&ipv6_dev_notf);
4313
1da177e4 4314 addrconf_verify(0);
c127ea2c
TG		 4315
4316 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4317 if (err < 0)
4318 goto errout;
4319
4320 /* Only the first call to __rtnl_register can fail */
4321 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4322 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4323 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4324 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4325 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4326
2a8cc6c8
YH		 4327 ipv6_addr_label_rtnl_register();
4328
1da177e4 4329 return 0;
c127ea2c
TG		 4330errout:
4331 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4332errlo:
4333 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4334
4335 return err;
1da177e4
LT		 4336}
4337
09f7709f 4338void addrconf_cleanup(void)
1da177e4 4339{
1ab1457c 4340 struct net_device *dev;
1ab1457c 4341 struct inet6_ifaddr *ifa;
1da177e4
LT		 4342 int i;
4343
4344 unregister_netdevice_notifier(&ipv6_dev_notf);
4345
e0da5a48 4346 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4347
4348 rtnl_lock();
4349
4350 /*
4351 * clean dev list.
4352 */
4353
881d966b 4354 for_each_netdev(&init_net, dev) {
dffe4f04 4355 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4356 continue;
4357 addrconf_ifdown(dev, 1);
4358 }
2774c7ab 4359 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4360
4361 /*
4362 * Check hash table.
4363 */
4364
4365 write_lock_bh(&addrconf_hash_lock);
4366 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4367 for (ifa=inet6_addr_lst[i]; ifa; ) {
4368 struct inet6_ifaddr *bifa;
4369
4370 bifa = ifa;
4371 ifa = ifa->lst_next;
4372 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4373 /* Do not free it; something is wrong.
4374 Now we can investigate it with debugger.
4375 */
4376 }
4377 }
4378 write_unlock_bh(&addrconf_hash_lock);
4379
4380 del_timer(&addr_chk_timer);
4381
4382 rtnl_unlock();
1da177e4 4383}
Clone of davem's net-next-2.6 tree