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[NET]: Fix the race between sk_filter_(de|at)tach and sk_clone()
[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
104static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
105static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
106#endif
107
108#ifdef CONFIG_IPV6_PRIVACY
109static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 110static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 111static void ipv6_regen_rndid(unsigned long data);
112
113static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 114#endif
115
116static int ipv6_count_addresses(struct inet6_dev *idev);
117
118/*
119 * Configured unicast address hash table
120 */
121static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122static DEFINE_RWLOCK(addrconf_hash_lock);
123
1da177e4
LT		 124static void addrconf_verify(unsigned long);
125
8d06afab 126static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 127static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132static int addrconf_ifdown(struct net_device *dev, int how);
133
e431b8c0 134static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 135static void addrconf_dad_timer(unsigned long data);
136static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 137static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 138static void addrconf_rs_timer(unsigned long data);
139static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
1ab1457c 142static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 143 struct prefix_info *pinfo);
144static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
e041c683 146static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 147
ab32ea5d 148struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160#ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166#endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 168 .accept_ra_defrtr = 1,
c4fd30eb 169 .accept_ra_pinfo = 1,
930d6ff2
YH		 170#ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
52e16356 172 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 173#ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175#endif
930d6ff2 176#endif
fbea49e1 177 .proxy_ndp = 0,
0bcbc926 178 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 179};
180
ab32ea5d 181static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192#ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198#endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 200 .accept_ra_defrtr = 1,
c4fd30eb 201 .accept_ra_pinfo = 1,
930d6ff2
YH		 202#ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
52e16356 204 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 205#ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207#endif
930d6ff2 208#endif
fbea49e1 209 .proxy_ndp = 0,
0bcbc926 210 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 211};
212
213/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 214const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 215const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
216
f24e3d65
MC		 217/* Check if a valid qdisc is available */
218static inline int addrconf_qdisc_ok(struct net_device *dev)
219{
220 return (dev->qdisc != &noop_qdisc);
221}
222
1da177e4
LT		 223static void addrconf_del_timer(struct inet6_ifaddr *ifp)
224{
225 if (del_timer(&ifp->timer))
226 __in6_ifa_put(ifp);
227}
228
229enum addrconf_timer_t
230{
231 AC_NONE,
232 AC_DAD,
233 AC_RS,
234};
235
236static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
238 unsigned long when)
239{
240 if (!del_timer(&ifp->timer))
241 in6_ifa_hold(ifp);
242
243 switch (what) {
244 case AC_DAD:
245 ifp->timer.function = addrconf_dad_timer;
246 break;
247 case AC_RS:
248 ifp->timer.function = addrconf_rs_timer;
249 break;
250 default:;
251 }
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
254}
255
7f7d9a6b
HX		 256static int snmp6_alloc_dev(struct inet6_dev *idev)
257{
258 int err = -ENOMEM;
259
260 if (!idev || !idev->dev)
261 return -EINVAL;
262
263 if (snmp_mib_init((void **)idev->stats.ipv6,
264 sizeof(struct ipstats_mib),
265 __alignof__(struct ipstats_mib)) < 0)
266 goto err_ip;
267 if (snmp_mib_init((void **)idev->stats.icmpv6,
268 sizeof(struct icmpv6_mib),
269 __alignof__(struct icmpv6_mib)) < 0)
270 goto err_icmp;
14878f75
DS		 271 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
272 sizeof(struct icmpv6msg_mib),
273 __alignof__(struct icmpv6msg_mib)) < 0)
274 goto err_icmpmsg;
7f7d9a6b
HX		 275
276 return 0;
277
14878f75
DS		 278err_icmpmsg:
279 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 280err_icmp:
281 snmp_mib_free((void **)idev->stats.ipv6);
282err_ip:
283 return err;
284}
285
286static int snmp6_free_dev(struct inet6_dev *idev)
287{
14878f75 288 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 289 snmp_mib_free((void **)idev->stats.icmpv6);
290 snmp_mib_free((void **)idev->stats.ipv6);
291 return 0;
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;
338 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
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
322f74a4
IO		 375 init_timer(&ndev->regen_timer);
376 ndev->regen_timer.function = ipv6_regen_rndid;
377 ndev->regen_timer.data = (unsigned long) ndev;
378 if ((dev->flags&IFF_LOOPBACK) ||
379 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 380#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
381 dev->type == ARPHRD_SIT ||
382#endif
383 dev->type == ARPHRD_NONE) {
322f74a4
IO		 384 printk(KERN_INFO
385 "%s: Disabled Privacy Extensions\n",
386 dev->name);
387 ndev->cnf.use_tempaddr = -1;
388 } else {
389 in6_dev_hold(ndev);
390 ipv6_regen_rndid((unsigned long) ndev);
391 }
1da177e4
LT		 392#endif
393
f24e3d65 394 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 395 ndev->if_flags |= IF_READY;
396
322f74a4
IO		 397 ipv6_mc_init_dev(ndev);
398 ndev->tstamp = jiffies;
1da177e4 399#ifdef CONFIG_SYSCTL
322f74a4
IO		 400 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
401 NET_IPV6_NEIGH, "ipv6",
402 &ndisc_ifinfo_sysctl_change,
403 NULL);
404 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 405#endif
30c4cf57
DS		 406 /* protected by rtnl_lock */
407 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 408
409 /* Join all-node multicast group */
410 ipv6_addr_all_nodes(&maddr);
411 ipv6_dev_mc_inc(dev, &maddr);
412
1da177e4
LT		 413 return ndev;
414}
415
416static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
417{
418 struct inet6_dev *idev;
419
420 ASSERT_RTNL();
421
422 if ((idev = __in6_dev_get(dev)) == NULL) {
423 if ((idev = ipv6_add_dev(dev)) == NULL)
424 return NULL;
425 }
c5e33bdd 426
1da177e4
LT		 427 if (dev->flags&IFF_UP)
428 ipv6_mc_up(idev);
429 return idev;
430}
431
432#ifdef CONFIG_SYSCTL
433static void dev_forward_change(struct inet6_dev *idev)
434{
435 struct net_device *dev;
436 struct inet6_ifaddr *ifa;
437 struct in6_addr addr;
438
439 if (!idev)
440 return;
441 dev = idev->dev;
442 if (dev && (dev->flags & IFF_MULTICAST)) {
443 ipv6_addr_all_routers(&addr);
1ab1457c 444
1da177e4
LT		 445 if (idev->cnf.forwarding)
446 ipv6_dev_mc_inc(dev, &addr);
447 else
448 ipv6_dev_mc_dec(dev, &addr);
449 }
450 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 451 if (ifa->flags&IFA_F_TENTATIVE)
452 continue;
1da177e4
LT		 453 if (idev->cnf.forwarding)
454 addrconf_join_anycast(ifa);
455 else
456 addrconf_leave_anycast(ifa);
457 }
458}
459
460
461static void addrconf_forward_change(void)
462{
463 struct net_device *dev;
464 struct inet6_dev *idev;
465
466 read_lock(&dev_base_lock);
881d966b 467 for_each_netdev(&init_net, dev) {
8814c4b5 468 rcu_read_lock();
1da177e4
LT		 469 idev = __in6_dev_get(dev);
470 if (idev) {
471 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
472 idev->cnf.forwarding = ipv6_devconf.forwarding;
473 if (changed)
474 dev_forward_change(idev);
475 }
8814c4b5 476 rcu_read_unlock();
1da177e4
LT		 477 }
478 read_unlock(&dev_base_lock);
479}
480#endif
481
482/* Nobody refers to this ifaddr, destroy it */
483
484void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
485{
486 BUG_TRAP(ifp->if_next==NULL);
487 BUG_TRAP(ifp->lst_next==NULL);
488#ifdef NET_REFCNT_DEBUG
489 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
490#endif
491
492 in6_dev_put(ifp->idev);
493
494 if (del_timer(&ifp->timer))
495 printk("Timer is still running, when freeing ifa=%p\n", ifp);
496
497 if (!ifp->dead) {
498 printk("Freeing alive inet6 address %p\n", ifp);
499 return;
500 }
501 dst_release(&ifp->rt->u.dst);
502
503 kfree(ifp);
504}
505
e55ffac6
BH		 506static void
507ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
508{
509 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 510 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 511
512 /*
513 * Each device address list is sorted in order of scope -
514 * global before linklocal.
515 */
516 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
517 ifap = &ifa->if_next) {
8a6ce0c0 518 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 519 break;
520 }
521
522 ifp->if_next = *ifap;
523 *ifap = ifp;
524}
525
1da177e4
LT		 526/* On success it returns ifp with increased reference count */
527
528static struct inet6_ifaddr *
529ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 530 int scope, u32 flags)
1da177e4
LT		 531{
532 struct inet6_ifaddr *ifa = NULL;
533 struct rt6_info *rt;
534 int hash;
535 int err = 0;
536
8814c4b5 537 rcu_read_lock_bh();
1da177e4
LT		 538 if (idev->dead) {
539 err = -ENODEV; /*XXX*/
540 goto out2;
541 }
542
543 write_lock(&addrconf_hash_lock);
544
545 /* Ignore adding duplicate addresses on an interface */
546 if (ipv6_chk_same_addr(addr, idev->dev)) {
547 ADBG(("ipv6_add_addr: already assigned\n"));
548 err = -EEXIST;
549 goto out;
550 }
551
322f74a4 552 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 553
554 if (ifa == NULL) {
555 ADBG(("ipv6_add_addr: malloc failed\n"));
556 err = -ENOBUFS;
557 goto out;
558 }
559
560 rt = addrconf_dst_alloc(idev, addr, 0);
561 if (IS_ERR(rt)) {
562 err = PTR_ERR(rt);
563 goto out;
564 }
565
1da177e4
LT		 566 ipv6_addr_copy(&ifa->addr, addr);
567
568 spin_lock_init(&ifa->lock);
569 init_timer(&ifa->timer);
570 ifa->timer.data = (unsigned long) ifa;
571 ifa->scope = scope;
572 ifa->prefix_len = pfxlen;
573 ifa->flags = flags | IFA_F_TENTATIVE;
574 ifa->cstamp = ifa->tstamp = jiffies;
575
57f5f544
KF		 576 ifa->rt = rt;
577
95c385b4
NH		 578 /*
579 * part one of RFC 4429, section 3.3
580 * We should not configure an address as
581 * optimistic if we do not yet know the link
582 * layer address of our nexhop router
583 */
584
585 if (rt->rt6i_nexthop == NULL)
586 ifa->flags &= ~IFA_F_OPTIMISTIC;
587
1da177e4
LT		 588 ifa->idev = idev;
589 in6_dev_hold(idev);
590 /* For caller */
591 in6_ifa_hold(ifa);
592
593 /* Add to big hash table */
594 hash = ipv6_addr_hash(addr);
595
596 ifa->lst_next = inet6_addr_lst[hash];
597 inet6_addr_lst[hash] = ifa;
598 in6_ifa_hold(ifa);
599 write_unlock(&addrconf_hash_lock);
600
601 write_lock(&idev->lock);
602 /* Add to inet6_dev unicast addr list. */
e55ffac6 603 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 604
605#ifdef CONFIG_IPV6_PRIVACY
606 if (ifa->flags&IFA_F_TEMPORARY) {
607 ifa->tmp_next = idev->tempaddr_list;
608 idev->tempaddr_list = ifa;
609 in6_ifa_hold(ifa);
610 }
611#endif
612
1da177e4
LT		 613 in6_ifa_hold(ifa);
614 write_unlock(&idev->lock);
615out2:
8814c4b5 616 rcu_read_unlock_bh();
1da177e4 617
fd92833a 618 if (likely(err == 0))
e041c683 619 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 620 else {
621 kfree(ifa);
622 ifa = ERR_PTR(err);
623 }
624
625 return ifa;
626out:
627 write_unlock(&addrconf_hash_lock);
628 goto out2;
629}
630
631/* This function wants to get referenced ifp and releases it before return */
632
633static void ipv6_del_addr(struct inet6_ifaddr *ifp)
634{
635 struct inet6_ifaddr *ifa, **ifap;
636 struct inet6_dev *idev = ifp->idev;
637 int hash;
638 int deleted = 0, onlink = 0;
639 unsigned long expires = jiffies;
640
641 hash = ipv6_addr_hash(&ifp->addr);
642
643 ifp->dead = 1;
644
645 write_lock_bh(&addrconf_hash_lock);
646 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
647 ifap = &ifa->lst_next) {
648 if (ifa == ifp) {
649 *ifap = ifa->lst_next;
650 __in6_ifa_put(ifp);
651 ifa->lst_next = NULL;
652 break;
653 }
654 }
655 write_unlock_bh(&addrconf_hash_lock);
656
657 write_lock_bh(&idev->lock);
658#ifdef CONFIG_IPV6_PRIVACY
659 if (ifp->flags&IFA_F_TEMPORARY) {
660 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
661 ifap = &ifa->tmp_next) {
662 if (ifa == ifp) {
663 *ifap = ifa->tmp_next;
664 if (ifp->ifpub) {
665 in6_ifa_put(ifp->ifpub);
666 ifp->ifpub = NULL;
667 }
668 __in6_ifa_put(ifp);
669 ifa->tmp_next = NULL;
670 break;
671 }
672 }
673 }
674#endif
675
1d142804 676 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 677 if (ifa == ifp) {
678 *ifap = ifa->if_next;
679 __in6_ifa_put(ifp);
680 ifa->if_next = NULL;
681 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
682 break;
683 deleted = 1;
1d142804 684 continue;
1da177e4
LT		 685 } else if (ifp->flags & IFA_F_PERMANENT) {
686 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
687 ifp->prefix_len)) {
688 if (ifa->flags & IFA_F_PERMANENT) {
689 onlink = 1;
690 if (deleted)
691 break;
692 } else {
693 unsigned long lifetime;
694
695 if (!onlink)
696 onlink = -1;
697
698 spin_lock(&ifa->lock);
699 lifetime = min_t(unsigned long,
700 ifa->valid_lft, 0x7fffffffUL/HZ);
701 if (time_before(expires,
702 ifa->tstamp + lifetime * HZ))
703 expires = ifa->tstamp + lifetime * HZ;
704 spin_unlock(&ifa->lock);
705 }
706 }
707 }
1d142804 708 ifap = &ifa->if_next;
1da177e4
LT		 709 }
710 write_unlock_bh(&idev->lock);
711
712 ipv6_ifa_notify(RTM_DELADDR, ifp);
713
e041c683 714 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 715
716 addrconf_del_timer(ifp);
717
718 /*
719 * Purge or update corresponding prefix
720 *
721 * 1) we don't purge prefix here if address was not permanent.
722 * prefix is managed by its own lifetime.
723 * 2) if there're no addresses, delete prefix.
724 * 3) if there're still other permanent address(es),
725 * corresponding prefix is still permanent.
726 * 4) otherwise, update prefix lifetime to the
727 * longest valid lifetime among the corresponding
728 * addresses on the device.
729 * Note: subsequent RA will update lifetime.
730 *
731 * --yoshfuji
732 */
733 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
734 struct in6_addr prefix;
735 struct rt6_info *rt;
736
737 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
738 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
739
740 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
741 if (onlink == 0) {
e0a1ad73 742 ip6_del_rt(rt);
1da177e4
LT		 743 rt = NULL;
744 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
745 rt->rt6i_expires = expires;
746 rt->rt6i_flags |= RTF_EXPIRES;
747 }
748 }
749 dst_release(&rt->u.dst);
750 }
751
752 in6_ifa_put(ifp);
753}
754
755#ifdef CONFIG_IPV6_PRIVACY
756static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
757{
758 struct inet6_dev *idev = ifp->idev;
759 struct in6_addr addr, *tmpaddr;
760 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
761 int tmp_plen;
762 int ret = 0;
763 int max_addresses;
95c385b4 764 u32 addr_flags;
1da177e4
LT		 765
766 write_lock(&idev->lock);
767 if (ift) {
768 spin_lock_bh(&ift->lock);
769 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
770 spin_unlock_bh(&ift->lock);
771 tmpaddr = &addr;
772 } else {
773 tmpaddr = NULL;
774 }
775retry:
776 in6_dev_hold(idev);
777 if (idev->cnf.use_tempaddr <= 0) {
778 write_unlock(&idev->lock);
779 printk(KERN_INFO
780 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
781 in6_dev_put(idev);
782 ret = -1;
783 goto out;
784 }
785 spin_lock_bh(&ifp->lock);
786 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
787 idev->cnf.use_tempaddr = -1; /*XXX*/
788 spin_unlock_bh(&ifp->lock);
789 write_unlock(&idev->lock);
790 printk(KERN_WARNING
791 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
792 in6_dev_put(idev);
793 ret = -1;
794 goto out;
795 }
796 in6_ifa_hold(ifp);
797 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
798 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
799 spin_unlock_bh(&ifp->lock);
800 write_unlock(&idev->lock);
801 printk(KERN_WARNING
802 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
803 in6_ifa_put(ifp);
804 in6_dev_put(idev);
805 ret = -1;
806 goto out;
807 }
808 memcpy(&addr.s6_addr[8], idev->rndid, 8);
809 tmp_valid_lft = min_t(__u32,
810 ifp->valid_lft,
811 idev->cnf.temp_valid_lft);
1ab1457c
YH		 812 tmp_prefered_lft = min_t(__u32,
813 ifp->prefered_lft,
1da177e4
LT		 814 idev->cnf.temp_prefered_lft - desync_factor / HZ);
815 tmp_plen = ifp->prefix_len;
816 max_addresses = idev->cnf.max_addresses;
817 tmp_cstamp = ifp->cstamp;
818 tmp_tstamp = ifp->tstamp;
819 spin_unlock_bh(&ifp->lock);
820
821 write_unlock(&idev->lock);
95c385b4
NH		 822
823 addr_flags = IFA_F_TEMPORARY;
824 /* set in addrconf_prefix_rcv() */
825 if (ifp->flags & IFA_F_OPTIMISTIC)
826 addr_flags |= IFA_F_OPTIMISTIC;
827
1da177e4 828 ift = !max_addresses ||
1ab1457c 829 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 830 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 831 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
832 addr_flags) : NULL;
1da177e4
LT		 833 if (!ift || IS_ERR(ift)) {
834 in6_ifa_put(ifp);
835 in6_dev_put(idev);
836 printk(KERN_INFO
837 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
838 tmpaddr = &addr;
839 write_lock(&idev->lock);
840 goto retry;
841 }
842
843 spin_lock_bh(&ift->lock);
844 ift->ifpub = ifp;
845 ift->valid_lft = tmp_valid_lft;
846 ift->prefered_lft = tmp_prefered_lft;
847 ift->cstamp = tmp_cstamp;
848 ift->tstamp = tmp_tstamp;
849 spin_unlock_bh(&ift->lock);
850
851 addrconf_dad_start(ift, 0);
852 in6_ifa_put(ift);
853 in6_dev_put(idev);
854out:
855 return ret;
856}
857#endif
858
859/*
072047e4 860 * Choose an appropriate source address (RFC3484)
1da177e4 861 */
072047e4
YH		 862struct ipv6_saddr_score {
863 int addr_type;
864 unsigned int attrs;
865 int matchlen;
0d27b427 866 int scope;
072047e4
YH		 867 unsigned int rule;
868};
869
870#define IPV6_SADDR_SCORE_LOCAL 0x0001
871#define IPV6_SADDR_SCORE_PREFERRED 0x0004
872#define IPV6_SADDR_SCORE_HOA 0x0008
873#define IPV6_SADDR_SCORE_OIF 0x0010
874#define IPV6_SADDR_SCORE_LABEL 0x0020
875#define IPV6_SADDR_SCORE_PRIVACY 0x0040
876
b6f99a21 877static inline int ipv6_saddr_preferred(int type)
1da177e4 878{
072047e4
YH		 879 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
880 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
881 return 1;
882 return 0;
1da177e4
LT		 883}
884
072047e4 885/* static matching label */
b6f99a21 886static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 887{
888 /*
889 * prefix (longest match) label
890 * -----------------------------
891 * ::1/128 0
892 * ::/0 1
893 * 2002::/16 2
894 * ::/96 3
895 * ::ffff:0:0/96 4
102128e3
ŁS		 896 * fc00::/7 5
897 * 2001::/32 6
072047e4
YH		 898 */
899 if (type & IPV6_ADDR_LOOPBACK)
900 return 0;
901 else if (type & IPV6_ADDR_COMPATv4)
902 return 3;
903 else if (type & IPV6_ADDR_MAPPED)
904 return 4;
102128e3
ŁS		 905 else if (addr->s6_addr32[0] == htonl(0x20010000))
906 return 6;
072047e4
YH		 907 else if (addr->s6_addr16[0] == htons(0x2002))
908 return 2;
102128e3
ŁS		 909 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
910 return 5;
072047e4
YH		 911 return 1;
912}
1da177e4 913
072047e4 914int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 915 struct in6_addr *daddr, struct in6_addr *saddr)
916{
072047e4
YH		 917 struct ipv6_saddr_score hiscore;
918 struct inet6_ifaddr *ifa_result = NULL;
919 int daddr_type = __ipv6_addr_type(daddr);
920 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
921 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
922 struct net_device *dev;
1da177e4 923
072047e4 924 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 925
072047e4 926 read_lock(&dev_base_lock);
8814c4b5 927 rcu_read_lock();
1da177e4 928
881d966b 929 for_each_netdev(&init_net, dev) {
072047e4
YH		 930 struct inet6_dev *idev;
931 struct inet6_ifaddr *ifa;
932
933 /* Rule 0: Candidate Source Address (section 4)
934 * - multicast and link-local destination address,
935 * the set of candidate source address MUST only
936 * include addresses assigned to interfaces
937 * belonging to the same link as the outgoing
938 * interface.
939 * (- For site-local destination addresses, the
940 * set of candidate source addresses MUST only
941 * include addresses assigned to interfaces
942 * belonging to the same site as the outgoing
943 * interface.)
944 */
945 if ((daddr_type & IPV6_ADDR_MULTICAST ||
946 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
947 daddr_dev && dev != daddr_dev)
948 continue;
1da177e4 949
1da177e4 950 idev = __in6_dev_get(dev);
072047e4
YH		 951 if (!idev)
952 continue;
953
954 read_lock_bh(&idev->lock);
955 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
956 struct ipv6_saddr_score score;
957
958 score.addr_type = __ipv6_addr_type(&ifa->addr);
959
6b3ae80a
YH		 960 /* Rule 0:
961 * - Tentative Address (RFC2462 section 5.4)
962 * - A tentative address is not considered
963 * "assigned to an interface" in the traditional
95c385b4 964 * sense, unless it is also flagged as optimistic.
6b3ae80a 965 * - Candidate Source Address (section 4)
072047e4
YH		 966 * - In any case, anycast addresses, multicast
967 * addresses, and the unspecified address MUST
968 * NOT be included in a candidate set.
969 */
95c385b4
NH		 970 if ((ifa->flags & IFA_F_TENTATIVE) &&
971 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 972 continue;
072047e4
YH		 973 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
974 score.addr_type & IPV6_ADDR_MULTICAST)) {
975 LIMIT_NETDEBUG(KERN_DEBUG
976 "ADDRCONF: unspecified / multicast address"
977 "assigned as unicast address on %s",
978 dev->name);
979 continue;
980 }
981
982 score.attrs = 0;
983 score.matchlen = 0;
984 score.scope = 0;
985 score.rule = 0;
986
987 if (ifa_result == NULL) {
988 /* record it if the first available entry */
989 goto record_it;
990 }
991
992 /* Rule 1: Prefer same address */
993 if (hiscore.rule < 1) {
994 if (ipv6_addr_equal(&ifa_result->addr, daddr))
995 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
996 hiscore.rule++;
997 }
998 if (ipv6_addr_equal(&ifa->addr, daddr)) {
999 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
1000 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1001 score.rule = 1;
1002 goto record_it;
1da177e4 1003 }
072047e4
YH		 1004 } else {
1005 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1006 continue;
1da177e4 1007 }
1da177e4 1008
072047e4
YH		 1009 /* Rule 2: Prefer appropriate scope */
1010 if (hiscore.rule < 2) {
1011 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1012 hiscore.rule++;
1013 }
1014 score.scope = __ipv6_addr_src_scope(score.addr_type);
1015 if (hiscore.scope < score.scope) {
1016 if (hiscore.scope < daddr_scope) {
1017 score.rule = 2;
1018 goto record_it;
1019 } else
1020 continue;
1021 } else if (score.scope < hiscore.scope) {
1022 if (score.scope < daddr_scope)
e55ffac6 1023 break; /* addresses sorted by scope */
072047e4
YH		 1024 else {
1025 score.rule = 2;
1026 goto record_it;
1027 }
1028 }
1da177e4 1029
95c385b4 1030 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1031 if (hiscore.rule < 3) {
1032 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1033 (((ifa_result->flags &
1034 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1035 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036 hiscore.rule++;
1037 }
1038 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1039 (((ifa->flags &
95c385b4 1040 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1041 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1042 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1043 score.rule = 3;
1044 goto record_it;
1045 }
1046 } else {
1047 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1048 continue;
1049 }
1da177e4 1050
3b9f9a1c 1051 /* Rule 4: Prefer home address */
59fbb3a6 1052#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1053 if (hiscore.rule < 4) {
1054 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1055 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1056 hiscore.rule++;
1057 }
1058 if (ifa->flags & IFA_F_HOMEADDRESS) {
1059 score.attrs |= IPV6_SADDR_SCORE_HOA;
1060 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1061 score.rule = 4;
1062 goto record_it;
1063 }
1064 } else {
1065 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1066 continue;
1067 }
1068#else
220bbd74
YH		 1069 if (hiscore.rule < 4)
1070 hiscore.rule++;
3b9f9a1c 1071#endif
072047e4
YH		 1072
1073 /* Rule 5: Prefer outgoing interface */
1074 if (hiscore.rule < 5) {
1075 if (daddr_dev == NULL ||
1076 daddr_dev == ifa_result->idev->dev)
1077 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1078 hiscore.rule++;
1079 }
1080 if (daddr_dev == NULL ||
1081 daddr_dev == ifa->idev->dev) {
1082 score.attrs |= IPV6_SADDR_SCORE_OIF;
1083 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1084 score.rule = 5;
1085 goto record_it;
1086 }
1087 } else {
1088 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1089 continue;
1090 }
1091
1092 /* Rule 6: Prefer matching label */
1093 if (hiscore.rule < 6) {
1094 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1095 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1096 hiscore.rule++;
1097 }
1098 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1099 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1100 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1101 score.rule = 6;
1102 goto record_it;
1da177e4 1103 }
072047e4
YH		 1104 } else {
1105 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1106 continue;
1107 }
1108
44fd0261 1109#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1110 /* Rule 7: Prefer public address
1111 * Note: prefer temprary address if use_tempaddr >= 2
1112 */
1113 if (hiscore.rule < 7) {
1114 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1115 (ifa_result->idev->cnf.use_tempaddr >= 2))
1116 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1117 hiscore.rule++;
1118 }
1119 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1120 (ifa->idev->cnf.use_tempaddr >= 2)) {
1121 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1122 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1123 score.rule = 7;
1124 goto record_it;
1125 }
1126 } else {
1127 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1128 continue;
1129 }
5e2707fa
YH		 1130#else
1131 if (hiscore.rule < 7)
1132 hiscore.rule++;
44fd0261 1133#endif
072047e4 1134 /* Rule 8: Use longest matching prefix */
12da2a43 1135 if (hiscore.rule < 8) {
072047e4 1136 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1137 hiscore.rule++;
1138 }
072047e4
YH		 1139 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1140 if (score.matchlen > hiscore.matchlen) {
1141 score.rule = 8;
1142 goto record_it;
1da177e4 1143 }
072047e4
YH		 1144#if 0
1145 else if (score.matchlen < hiscore.matchlen)
1146 continue;
1147#endif
1148
1149 /* Final Rule: choose first available one */
1150 continue;
1151record_it:
1152 if (ifa_result)
1153 in6_ifa_put(ifa_result);
1154 in6_ifa_hold(ifa);
1155 ifa_result = ifa;
1156 hiscore = score;
1da177e4 1157 }
072047e4 1158 read_unlock_bh(&idev->lock);
1da177e4 1159 }
8814c4b5 1160 rcu_read_unlock();
1da177e4
LT		 1161 read_unlock(&dev_base_lock);
1162
072047e4
YH		 1163 if (!ifa_result)
1164 return -EADDRNOTAVAIL;
1ab1457c 1165
072047e4
YH		 1166 ipv6_addr_copy(saddr, &ifa_result->addr);
1167 in6_ifa_put(ifa_result);
1168 return 0;
1da177e4
LT		 1169}
1170
1171
1172int ipv6_get_saddr(struct dst_entry *dst,
1173 struct in6_addr *daddr, struct in6_addr *saddr)
1174{
7a3025b1 1175 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1176}
1177
7159039a 1178EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1179
95c385b4
NH		 1180int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1181 unsigned char banned_flags)
1da177e4
LT		 1182{
1183 struct inet6_dev *idev;
1184 int err = -EADDRNOTAVAIL;
1185
8814c4b5 1186 rcu_read_lock();
1da177e4
LT		 1187 if ((idev = __in6_dev_get(dev)) != NULL) {
1188 struct inet6_ifaddr *ifp;
1189
1190 read_lock_bh(&idev->lock);
1191 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1192 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1193 ipv6_addr_copy(addr, &ifp->addr);
1194 err = 0;
1195 break;
1196 }
1197 }
1198 read_unlock_bh(&idev->lock);
1199 }
8814c4b5 1200 rcu_read_unlock();
1da177e4
LT		 1201 return err;
1202}
1203
1204static int ipv6_count_addresses(struct inet6_dev *idev)
1205{
1206 int cnt = 0;
1207 struct inet6_ifaddr *ifp;
1208
1209 read_lock_bh(&idev->lock);
1210 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1211 cnt++;
1212 read_unlock_bh(&idev->lock);
1213 return cnt;
1214}
1215
1216int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1217{
1218 struct inet6_ifaddr * ifp;
1219 u8 hash = ipv6_addr_hash(addr);
1220
1221 read_lock_bh(&addrconf_hash_lock);
1222 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1223 if (ipv6_addr_equal(&ifp->addr, addr) &&
1224 !(ifp->flags&IFA_F_TENTATIVE)) {
1225 if (dev == NULL || ifp->idev->dev == dev ||
1226 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1227 break;
1228 }
1229 }
1230 read_unlock_bh(&addrconf_hash_lock);
1231 return ifp != NULL;
1232}
1233
7159039a
YH		 1234EXPORT_SYMBOL(ipv6_chk_addr);
1235
1da177e4
LT		 1236static
1237int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1238{
1239 struct inet6_ifaddr * ifp;
1240 u8 hash = ipv6_addr_hash(addr);
1241
1242 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1243 if (ipv6_addr_equal(&ifp->addr, addr)) {
1244 if (dev == NULL || ifp->idev->dev == dev)
1245 break;
1246 }
1247 }
1248 return ifp != NULL;
1249}
1250
1251struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1252{
1253 struct inet6_ifaddr * ifp;
1254 u8 hash = ipv6_addr_hash(addr);
1255
1256 read_lock_bh(&addrconf_hash_lock);
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
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);
1da177e4
LT		 1444 }
1445 return -1;
1446}
1447
1448static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1449{
1450 int err = -1;
1451 struct inet6_ifaddr *ifp;
1452
1453 read_lock_bh(&idev->lock);
1454 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1455 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1456 memcpy(eui, ifp->addr.s6_addr+8, 8);
1457 err = 0;
1458 break;
1459 }
1460 }
1461 read_unlock_bh(&idev->lock);
1462 return err;
1463}
1464
1465#ifdef CONFIG_IPV6_PRIVACY
1466/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1467static int __ipv6_regen_rndid(struct inet6_dev *idev)
1468{
1da177e4 1469regen:
955189ef 1470 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1471 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1472
1473 /*
1474 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1475 * check if generated address is not inappropriate
1476 *
1477 * - Reserved subnet anycast (RFC 2526)
1478 * 11111101 11....11 1xxxxxxx
1479 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1480 * 00-00-5E-FE-xx-xx-xx-xx
1481 * - value 0
1482 * - XXX: already assigned to an address on the device
1483 */
1ab1457c 1484 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1485 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1486 (idev->rndid[7]&0x80))
1487 goto regen;
1488 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1489 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1490 goto regen;
1491 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1492 goto regen;
1493 }
1494
1495 return 0;
1496}
1497
1498static void ipv6_regen_rndid(unsigned long data)
1499{
1500 struct inet6_dev *idev = (struct inet6_dev *) data;
1501 unsigned long expires;
1502
8814c4b5 1503 rcu_read_lock_bh();
1da177e4
LT		 1504 write_lock_bh(&idev->lock);
1505
1506 if (idev->dead)
1507 goto out;
1508
1509 if (__ipv6_regen_rndid(idev) < 0)
1510 goto out;
1ab1457c 1511
1da177e4 1512 expires = jiffies +
1ab1457c 1513 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1514 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1515 if (time_before(expires, jiffies)) {
1516 printk(KERN_WARNING
1517 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1518 idev->dev->name);
1519 goto out;
1520 }
1521
1522 if (!mod_timer(&idev->regen_timer, expires))
1523 in6_dev_hold(idev);
1524
1525out:
1526 write_unlock_bh(&idev->lock);
8814c4b5 1527 rcu_read_unlock_bh();
1da177e4
LT		 1528 in6_dev_put(idev);
1529}
1530
1531static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1532 int ret = 0;
1533
1534 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1535 ret = __ipv6_regen_rndid(idev);
1536 return ret;
1537}
1538#endif
1539
1540/*
1541 * Add prefix route.
1542 */
1543
1544static void
1545addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1546 unsigned long expires, u32 flags)
1da177e4 1547{
86872cb5
TG		 1548 struct fib6_config cfg = {
1549 .fc_table = RT6_TABLE_PREFIX,
1550 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1551 .fc_ifindex = dev->ifindex,
1552 .fc_expires = expires,
1553 .fc_dst_len = plen,
1554 .fc_flags = RTF_UP | flags,
1555 };
1da177e4 1556
86872cb5 1557 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1558
1559 /* Prevent useless cloning on PtP SIT.
1560 This thing is done here expecting that the whole
1561 class of non-broadcast devices need not cloning.
1562 */
0be669bb 1563#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1564 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1565 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1566#endif
1da177e4 1567
86872cb5 1568 ip6_route_add(&cfg);
1da177e4
LT		 1569}
1570
1571/* Create "default" multicast route to the interface */
1572
1573static void addrconf_add_mroute(struct net_device *dev)
1574{
86872cb5
TG		 1575 struct fib6_config cfg = {
1576 .fc_table = RT6_TABLE_LOCAL,
1577 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1578 .fc_ifindex = dev->ifindex,
1579 .fc_dst_len = 8,
1580 .fc_flags = RTF_UP,
1581 };
1582
1583 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1584
1585 ip6_route_add(&cfg);
1da177e4
LT		 1586}
1587
0be669bb 1588#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1589static void sit_route_add(struct net_device *dev)
1590{
86872cb5
TG		 1591 struct fib6_config cfg = {
1592 .fc_table = RT6_TABLE_MAIN,
1593 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1594 .fc_ifindex = dev->ifindex,
1595 .fc_dst_len = 96,
1596 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1597 };
1da177e4
LT		 1598
1599 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1600 ip6_route_add(&cfg);
1da177e4 1601}
0be669bb 1602#endif
1da177e4
LT		 1603
1604static void addrconf_add_lroute(struct net_device *dev)
1605{
1606 struct in6_addr addr;
1607
1608 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1609 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1610}
1611
1612static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1613{
1614 struct inet6_dev *idev;
1615
1616 ASSERT_RTNL();
1617
1618 if ((idev = ipv6_find_idev(dev)) == NULL)
1619 return NULL;
1620
1621 /* Add default multicast route */
1622 addrconf_add_mroute(dev);
1623
1624 /* Add link local route */
1625 addrconf_add_lroute(dev);
1626 return idev;
1627}
1628
1629void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1630{
1631 struct prefix_info *pinfo;
1632 __u32 valid_lft;
1633 __u32 prefered_lft;
1634 int addr_type;
1635 unsigned long rt_expires;
1636 struct inet6_dev *in6_dev;
1637
1638 pinfo = (struct prefix_info *) opt;
1ab1457c 1639
1da177e4
LT		 1640 if (len < sizeof(struct prefix_info)) {
1641 ADBG(("addrconf: prefix option too short\n"));
1642 return;
1643 }
1ab1457c 1644
1da177e4
LT		 1645 /*
1646 * Validation checks ([ADDRCONF], page 19)
1647 */
1648
1649 addr_type = ipv6_addr_type(&pinfo->prefix);
1650
1651 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1652 return;
1653
1654 valid_lft = ntohl(pinfo->valid);
1655 prefered_lft = ntohl(pinfo->prefered);
1656
1657 if (prefered_lft > valid_lft) {
1658 if (net_ratelimit())
1659 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1660 return;
1661 }
1662
1663 in6_dev = in6_dev_get(dev);
1664
1665 if (in6_dev == NULL) {
1666 if (net_ratelimit())
1667 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1668 return;
1669 }
1670
1671 /*
1672 * Two things going on here:
1673 * 1) Add routes for on-link prefixes
1674 * 2) Configure prefixes with the auto flag set
1675 */
1676
1677 /* Avoid arithmetic overflow. Really, we could
1678 save rt_expires in seconds, likely valid_lft,
1679 but it would require division in fib gc, that it
1680 not good.
1681 */
1682 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1683 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1684 else
3dd4bc68
YH		 1685 rt_expires = valid_lft * HZ;
1686
1687 /*
1688 * We convert this (in jiffies) to clock_t later.
1689 * Avoid arithmetic overflow there as well.
1690 * Overflow can happen only if HZ < USER_HZ.
1691 */
1692 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1693 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1694
1695 if (pinfo->onlink) {
1696 struct rt6_info *rt;
1697 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1698
1699 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1700 if (rt->rt6i_flags&RTF_EXPIRES) {
1701 if (valid_lft == 0) {
e0a1ad73 1702 ip6_del_rt(rt);
1da177e4
LT		 1703 rt = NULL;
1704 } else {
3dd4bc68 1705 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1706 }
1707 }
1708 } else if (valid_lft) {
1709 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1710 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1711 }
1712 if (rt)
1713 dst_release(&rt->u.dst);
1714 }
1715
1716 /* Try to figure out our local address for this prefix */
1717
1718 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1719 struct inet6_ifaddr * ifp;
1720 struct in6_addr addr;
1721 int create = 0, update_lft = 0;
1722
1723 if (pinfo->prefix_len == 64) {
1724 memcpy(&addr, &pinfo->prefix, 8);
1725 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1726 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1727 in6_dev_put(in6_dev);
1728 return;
1729 }
1730 goto ok;
1731 }
1732 if (net_ratelimit())
1733 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1734 pinfo->prefix_len);
1735 in6_dev_put(in6_dev);
1736 return;
1737
1738ok:
1739
1740 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1741
1742 if (ifp == NULL && valid_lft) {
1743 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1744 u32 addr_flags = 0;
1745
1746#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1747 if (in6_dev->cnf.optimistic_dad &&
1748 !ipv6_devconf.forwarding)
1749 addr_flags = IFA_F_OPTIMISTIC;
1750#endif
1da177e4
LT		 1751
1752 /* Do not allow to create too much of autoconfigured
1753 * addresses; this would be too easy way to crash kernel.
1754 */
1755 if (!max_addresses ||
1756 ipv6_count_addresses(in6_dev) < max_addresses)
1757 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1758 addr_type&IPV6_ADDR_SCOPE_MASK,
1759 addr_flags);
1da177e4
LT		 1760
1761 if (!ifp || IS_ERR(ifp)) {
1762 in6_dev_put(in6_dev);
1763 return;
1764 }
1765
1766 update_lft = create = 1;
1767 ifp->cstamp = jiffies;
1768 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1769 }
1770
1771 if (ifp) {
1772 int flags;
1773 unsigned long now;
1774#ifdef CONFIG_IPV6_PRIVACY
1775 struct inet6_ifaddr *ift;
1776#endif
1777 u32 stored_lft;
1778
1779 /* update lifetime (RFC2462 5.5.3 e) */
1780 spin_lock(&ifp->lock);
1781 now = jiffies;
1782 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1783 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1784 else
1785 stored_lft = 0;
1786 if (!update_lft && stored_lft) {
1787 if (valid_lft > MIN_VALID_LIFETIME ||
1788 valid_lft > stored_lft)
1789 update_lft = 1;
1790 else if (stored_lft <= MIN_VALID_LIFETIME) {
1791 /* valid_lft <= stored_lft is always true */
1792 /* XXX: IPsec */
1793 update_lft = 0;
1794 } else {
1795 valid_lft = MIN_VALID_LIFETIME;
1796 if (valid_lft < prefered_lft)
1797 prefered_lft = valid_lft;
1798 update_lft = 1;
1799 }
1800 }
1801
1802 if (update_lft) {
1803 ifp->valid_lft = valid_lft;
1804 ifp->prefered_lft = prefered_lft;
1805 ifp->tstamp = now;
1806 flags = ifp->flags;
1807 ifp->flags &= ~IFA_F_DEPRECATED;
1808 spin_unlock(&ifp->lock);
1809
1810 if (!(flags&IFA_F_TENTATIVE))
1811 ipv6_ifa_notify(0, ifp);
1812 } else
1813 spin_unlock(&ifp->lock);
1814
1815#ifdef CONFIG_IPV6_PRIVACY
1816 read_lock_bh(&in6_dev->lock);
1817 /* update all temporary addresses in the list */
1818 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1819 /*
1820 * When adjusting the lifetimes of an existing
1821 * temporary address, only lower the lifetimes.
1822 * Implementations must not increase the
1823 * lifetimes of an existing temporary address
1824 * when processing a Prefix Information Option.
1825 */
1826 spin_lock(&ift->lock);
1827 flags = ift->flags;
1828 if (ift->valid_lft > valid_lft &&
1829 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1830 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1831 if (ift->prefered_lft > prefered_lft &&
1832 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1833 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1834 spin_unlock(&ift->lock);
1835 if (!(flags&IFA_F_TENTATIVE))
1836 ipv6_ifa_notify(0, ift);
1837 }
1838
1839 if (create && in6_dev->cnf.use_tempaddr > 0) {
1840 /*
1841 * When a new public address is created as described in [ADDRCONF],
1842 * also create a new temporary address.
1843 */
1ab1457c 1844 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1845 ipv6_create_tempaddr(ifp, NULL);
1846 } else {
1847 read_unlock_bh(&in6_dev->lock);
1848 }
1849#endif
1850 in6_ifa_put(ifp);
1851 addrconf_verify(0);
1852 }
1853 }
1854 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1855 in6_dev_put(in6_dev);
1856}
1857
1858/*
1859 * Set destination address.
1860 * Special case for SIT interfaces where we create a new "virtual"
1861 * device.
1862 */
1863int addrconf_set_dstaddr(void __user *arg)
1864{
1865 struct in6_ifreq ireq;
1866 struct net_device *dev;
1867 int err = -EINVAL;
1868
1869 rtnl_lock();
1870
1871 err = -EFAULT;
1872 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1873 goto err_exit;
1874
881d966b 1875 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1876
1877 err = -ENODEV;
1878 if (dev == NULL)
1879 goto err_exit;
1880
0be669bb 1881#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1882 if (dev->type == ARPHRD_SIT) {
1883 struct ifreq ifr;
1884 mm_segment_t oldfs;
1885 struct ip_tunnel_parm p;
1886
1887 err = -EADDRNOTAVAIL;
1888 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1889 goto err_exit;
1890
1891 memset(&p, 0, sizeof(p));
1892 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1893 p.iph.saddr = 0;
1894 p.iph.version = 4;
1895 p.iph.ihl = 5;
1896 p.iph.protocol = IPPROTO_IPV6;
1897 p.iph.ttl = 64;
1898 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1899
1900 oldfs = get_fs(); set_fs(KERNEL_DS);
1901 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1902 set_fs(oldfs);
1903
1904 if (err == 0) {
1905 err = -ENOBUFS;
881d966b 1906 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1907 goto err_exit;
1908 err = dev_open(dev);
1909 }
1910 }
0be669bb 1911#endif
1da177e4
LT		 1912
1913err_exit:
1914 rtnl_unlock();
1915 return err;
1916}
1917
1918/*
1919 * Manual configuration of address on an interface
1920 */
0778769d 1921static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1922 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1923{
1924 struct inet6_ifaddr *ifp;
1925 struct inet6_dev *idev;
1926 struct net_device *dev;
1927 int scope;
46d48046 1928 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1929
1930 ASSERT_RTNL();
1ab1457c 1931
0778769d
NT		 1932 /* check the lifetime */
1933 if (!valid_lft || prefered_lft > valid_lft)
1934 return -EINVAL;
1935
881d966b 1936 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1937 return -ENODEV;
1ab1457c 1938
1da177e4
LT		 1939 if ((idev = addrconf_add_dev(dev)) == NULL)
1940 return -ENOBUFS;
1941
1942 scope = ipv6_addr_scope(pfx);
1943
46d48046 1944 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1945 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1946 flags = 0;
1947 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1948 valid_lft = 0x7FFFFFFF/HZ;
1949
1950 if (prefered_lft == 0)
1951 ifa_flags |= IFA_F_DEPRECATED;
1952 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1953 (prefered_lft != INFINITY_LIFE_TIME))
1954 prefered_lft = 0x7FFFFFFF/HZ;
1955
1956 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1957
1da177e4 1958 if (!IS_ERR(ifp)) {
06aebfb7 1959 spin_lock_bh(&ifp->lock);
0778769d
NT		 1960 ifp->valid_lft = valid_lft;
1961 ifp->prefered_lft = prefered_lft;
1962 ifp->tstamp = jiffies;
06aebfb7 1963 spin_unlock_bh(&ifp->lock);
0778769d 1964
46d48046
YH		 1965 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1966 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1967 /*
1968 * Note that section 3.1 of RFC 4429 indicates
1969 * that the Optimistic flag should not be set for
1970 * manually configured addresses
1971 */
1da177e4
LT		 1972 addrconf_dad_start(ifp, 0);
1973 in6_ifa_put(ifp);
0778769d 1974 addrconf_verify(0);
1da177e4
LT		 1975 return 0;
1976 }
1977
1978 return PTR_ERR(ifp);
1979}
1980
1981static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1982{
1983 struct inet6_ifaddr *ifp;
1984 struct inet6_dev *idev;
1985 struct net_device *dev;
1ab1457c 1986
881d966b 1987 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1988 return -ENODEV;
1989
1990 if ((idev = __in6_dev_get(dev)) == NULL)
1991 return -ENXIO;
1992
1993 read_lock_bh(&idev->lock);
1994 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1995 if (ifp->prefix_len == plen &&
1996 ipv6_addr_equal(pfx, &ifp->addr)) {
1997 in6_ifa_hold(ifp);
1998 read_unlock_bh(&idev->lock);
1ab1457c 1999
1da177e4
LT		 2000 ipv6_del_addr(ifp);
2001
2002 /* If the last address is deleted administratively,
2003 disable IPv6 on this interface.
2004 */
2005 if (idev->addr_list == NULL)
2006 addrconf_ifdown(idev->dev, 1);
2007 return 0;
2008 }
2009 }
2010 read_unlock_bh(&idev->lock);
2011 return -EADDRNOTAVAIL;
2012}
2013
2014
2015int addrconf_add_ifaddr(void __user *arg)
2016{
2017 struct in6_ifreq ireq;
2018 int err;
1ab1457c 2019
1da177e4
LT		 2020 if (!capable(CAP_NET_ADMIN))
2021 return -EPERM;
1ab1457c 2022
1da177e4
LT		 2023 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024 return -EFAULT;
2025
2026 rtnl_lock();
0778769d 2027 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2028 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2029 rtnl_unlock();
2030 return err;
2031}
2032
2033int addrconf_del_ifaddr(void __user *arg)
2034{
2035 struct in6_ifreq ireq;
2036 int err;
1ab1457c 2037
1da177e4
LT		 2038 if (!capable(CAP_NET_ADMIN))
2039 return -EPERM;
2040
2041 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2042 return -EFAULT;
2043
2044 rtnl_lock();
2045 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2046 rtnl_unlock();
2047 return err;
2048}
2049
0be669bb 2050#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2051static void sit_add_v4_addrs(struct inet6_dev *idev)
2052{
2053 struct inet6_ifaddr * ifp;
2054 struct in6_addr addr;
2055 struct net_device *dev;
2056 int scope;
2057
2058 ASSERT_RTNL();
2059
2060 memset(&addr, 0, sizeof(struct in6_addr));
2061 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2062
2063 if (idev->dev->flags&IFF_POINTOPOINT) {
2064 addr.s6_addr32[0] = htonl(0xfe800000);
2065 scope = IFA_LINK;
2066 } else {
2067 scope = IPV6_ADDR_COMPATv4;
2068 }
2069
2070 if (addr.s6_addr32[3]) {
2071 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2072 if (!IS_ERR(ifp)) {
2073 spin_lock_bh(&ifp->lock);
2074 ifp->flags &= ~IFA_F_TENTATIVE;
2075 spin_unlock_bh(&ifp->lock);
2076 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2077 in6_ifa_put(ifp);
2078 }
2079 return;
2080 }
2081
881d966b 2082 for_each_netdev(&init_net, dev) {
e5ed6399 2083 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2084 if (in_dev && (dev->flags & IFF_UP)) {
2085 struct in_ifaddr * ifa;
2086
2087 int flag = scope;
2088
2089 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2090 int plen;
2091
2092 addr.s6_addr32[3] = ifa->ifa_local;
2093
2094 if (ifa->ifa_scope == RT_SCOPE_LINK)
2095 continue;
2096 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2097 if (idev->dev->flags&IFF_POINTOPOINT)
2098 continue;
2099 flag |= IFA_HOST;
2100 }
2101 if (idev->dev->flags&IFF_POINTOPOINT)
2102 plen = 64;
2103 else
2104 plen = 96;
2105
2106 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2107 IFA_F_PERMANENT);
2108 if (!IS_ERR(ifp)) {
2109 spin_lock_bh(&ifp->lock);
2110 ifp->flags &= ~IFA_F_TENTATIVE;
2111 spin_unlock_bh(&ifp->lock);
2112 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2113 in6_ifa_put(ifp);
2114 }
2115 }
2116 }
1ab1457c 2117 }
1da177e4 2118}
0be669bb 2119#endif
1da177e4
LT		 2120
2121static void init_loopback(struct net_device *dev)
2122{
2123 struct inet6_dev *idev;
2124 struct inet6_ifaddr * ifp;
2125
2126 /* ::1 */
2127
2128 ASSERT_RTNL();
2129
2130 if ((idev = ipv6_find_idev(dev)) == NULL) {
2131 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2132 return;
2133 }
2134
2135 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2136 if (!IS_ERR(ifp)) {
2137 spin_lock_bh(&ifp->lock);
2138 ifp->flags &= ~IFA_F_TENTATIVE;
2139 spin_unlock_bh(&ifp->lock);
2140 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2141 in6_ifa_put(ifp);
2142 }
2143}
2144
2145static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2146{
2147 struct inet6_ifaddr * ifp;
95c385b4
NH		 2148 u32 addr_flags = IFA_F_PERMANENT;
2149
2150#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2151 if (idev->cnf.optimistic_dad &&
2152 !ipv6_devconf.forwarding)
2153 addr_flags |= IFA_F_OPTIMISTIC;
2154#endif
1da177e4 2155
95c385b4
NH		 2156
2157 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2158 if (!IS_ERR(ifp)) {
46d48046 2159 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2160 addrconf_dad_start(ifp, 0);
2161 in6_ifa_put(ifp);
2162 }
2163}
2164
2165static void addrconf_dev_config(struct net_device *dev)
2166{
2167 struct in6_addr addr;
2168 struct inet6_dev * idev;
2169
2170 ASSERT_RTNL();
2171
74235a25
HX		 2172 if ((dev->type != ARPHRD_ETHER) &&
2173 (dev->type != ARPHRD_FDDI) &&
2174 (dev->type != ARPHRD_IEEE802_TR) &&
2175 (dev->type != ARPHRD_ARCNET) &&
2176 (dev->type != ARPHRD_INFINIBAND)) {
2177 /* Alas, we support only Ethernet autoconfiguration. */
2178 return;
2179 }
2180
1da177e4
LT		 2181 idev = addrconf_add_dev(dev);
2182 if (idev == NULL)
2183 return;
2184
2185 memset(&addr, 0, sizeof(struct in6_addr));
2186 addr.s6_addr32[0] = htonl(0xFE800000);
2187
2188 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2189 addrconf_add_linklocal(idev, &addr);
2190}
2191
0be669bb 2192#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2193static void addrconf_sit_config(struct net_device *dev)
2194{
2195 struct inet6_dev *idev;
2196
2197 ASSERT_RTNL();
2198
1ab1457c
YH		 2199 /*
2200 * Configure the tunnel with one of our IPv4
2201 * addresses... we should configure all of
1da177e4
LT		 2202 * our v4 addrs in the tunnel
2203 */
2204
2205 if ((idev = ipv6_find_idev(dev)) == NULL) {
2206 printk(KERN_DEBUG "init sit: add_dev failed\n");
2207 return;
2208 }
2209
2210 sit_add_v4_addrs(idev);
2211
2212 if (dev->flags&IFF_POINTOPOINT) {
2213 addrconf_add_mroute(dev);
2214 addrconf_add_lroute(dev);
2215 } else
2216 sit_route_add(dev);
2217}
0be669bb 2218#endif
1da177e4
LT		 2219
2220static inline int
2221ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2222{
2223 struct in6_addr lladdr;
2224
95c385b4 2225 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2226 addrconf_add_linklocal(idev, &lladdr);
2227 return 0;
2228 }
2229 return -1;
2230}
2231
2232static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2233{
2234 struct net_device *link_dev;
2235
2236 /* first try to inherit the link-local address from the link device */
2237 if (idev->dev->iflink &&
881d966b 2238 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2239 if (!ipv6_inherit_linklocal(idev, link_dev))
2240 return;
2241 }
2242 /* then try to inherit it from any device */
881d966b 2243 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2244 if (!ipv6_inherit_linklocal(idev, link_dev))
2245 return;
2246 }
2247 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2248}
2249
2250/*
2251 * Autoconfigure tunnel with a link-local address so routing protocols,
2252 * DHCPv6, MLD etc. can be run over the virtual link
2253 */
2254
2255static void addrconf_ip6_tnl_config(struct net_device *dev)
2256{
2257 struct inet6_dev *idev;
2258
2259 ASSERT_RTNL();
2260
2261 if ((idev = addrconf_add_dev(dev)) == NULL) {
2262 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2263 return;
2264 }
2265 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2266}
2267
1ab1457c 2268static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2269 void * data)
2270{
2271 struct net_device *dev = (struct net_device *) data;
74235a25 2272 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2273 int run_pending = 0;
b217d616 2274 int err;
1da177e4 2275
e9dc8653
EB		 2276 if (dev->nd_net != &init_net)
2277 return NOTIFY_DONE;
2278
1da177e4 2279 switch(event) {
45ba9dd2 2280 case NETDEV_REGISTER:
74235a25 2281 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2282 idev = ipv6_add_dev(dev);
2283 if (!idev)
b217d616 2284 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2285 }
2286 break;
1da177e4 2287 case NETDEV_UP:
3c21edbd 2288 case NETDEV_CHANGE:
c2edacf8
JV		 2289 if (dev->flags & IFF_SLAVE)
2290 break;
2291
3c21edbd 2292 if (event == NETDEV_UP) {
f24e3d65 2293 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2294 /* device is not ready yet. */
2295 printk(KERN_INFO
2296 "ADDRCONF(NETDEV_UP): %s: "
2297 "link is not ready\n",
2298 dev->name);
2299 break;
2300 }
99081049
KS		 2301
2302 if (idev)
2303 idev->if_flags |= IF_READY;
3c21edbd 2304 } else {
f24e3d65 2305 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2306 /* device is still not ready. */
2307 break;
2308 }
2309
2310 if (idev) {
2311 if (idev->if_flags & IF_READY) {
2312 /* device is already configured. */
2313 break;
2314 }
2315 idev->if_flags |= IF_READY;
2316 }
2317
2318 printk(KERN_INFO
2319 "ADDRCONF(NETDEV_CHANGE): %s: "
2320 "link becomes ready\n",
2321 dev->name);
2322
c5e33bdd 2323 run_pending = 1;
3c21edbd
YH		 2324 }
2325
1da177e4 2326 switch(dev->type) {
0be669bb 2327#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2328 case ARPHRD_SIT:
2329 addrconf_sit_config(dev);
2330 break;
0be669bb 2331#endif
1da177e4
LT		 2332 case ARPHRD_TUNNEL6:
2333 addrconf_ip6_tnl_config(dev);
2334 break;
2335 case ARPHRD_LOOPBACK:
2336 init_loopback(dev);
2337 break;
2338
2339 default:
2340 addrconf_dev_config(dev);
2341 break;
3ff50b79 2342 }
1da177e4 2343 if (idev) {
c5e33bdd
YH		 2344 if (run_pending)
2345 addrconf_dad_run(idev);
2346
1da177e4
LT		 2347 /* If the MTU changed during the interface down, when the
2348 interface up, the changed MTU must be reflected in the
2349 idev as well as routers.
2350 */
2351 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2352 rt6_mtu_change(dev, dev->mtu);
2353 idev->cnf.mtu6 = dev->mtu;
2354 }
2355 idev->tstamp = jiffies;
2356 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2357 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2358 stop IPv6 on this interface.
2359 */
2360 if (dev->mtu < IPV6_MIN_MTU)
2361 addrconf_ifdown(dev, event != NETDEV_DOWN);
2362 }
2363 break;
2364
2365 case NETDEV_CHANGEMTU:
2366 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2367 rt6_mtu_change(dev, dev->mtu);
2368 idev->cnf.mtu6 = dev->mtu;
2369 break;
2370 }
2371
2372 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2373
2374 case NETDEV_DOWN:
2375 case NETDEV_UNREGISTER:
2376 /*
2377 * Remove all addresses from this interface.
2378 */
2379 addrconf_ifdown(dev, event != NETDEV_DOWN);
2380 break;
3c21edbd 2381
1da177e4 2382 case NETDEV_CHANGENAME:
1da177e4 2383 if (idev) {
5632c515
SH		 2384 snmp6_unregister_dev(idev);
2385#ifdef CONFIG_SYSCTL
1da177e4
LT		 2386 addrconf_sysctl_unregister(&idev->cnf);
2387 neigh_sysctl_unregister(idev->nd_parms);
2388 neigh_sysctl_register(dev, idev->nd_parms,
2389 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2390 &ndisc_ifinfo_sysctl_change,
2391 NULL);
2392 addrconf_sysctl_register(idev, &idev->cnf);
1da177e4 2393#endif
b217d616
HX		 2394 err = snmp6_register_dev(idev);
2395 if (err)
2396 return notifier_from_errno(err);
5632c515 2397 }
1da177e4 2398 break;
3ff50b79 2399 }
1da177e4
LT		 2400
2401 return NOTIFY_OK;
2402}
2403
2404/*
2405 * addrconf module should be notified of a device going up
2406 */
2407static struct notifier_block ipv6_dev_notf = {
2408 .notifier_call = addrconf_notify,
2409 .priority = 0
2410};
2411
2412static int addrconf_ifdown(struct net_device *dev, int how)
2413{
2414 struct inet6_dev *idev;
2415 struct inet6_ifaddr *ifa, **bifa;
2416 int i;
2417
2418 ASSERT_RTNL();
2419
2774c7ab 2420 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2421 how = 0;
2422
2423 rt6_ifdown(dev);
2424 neigh_ifdown(&nd_tbl, dev);
2425
2426 idev = __in6_dev_get(dev);
2427 if (idev == NULL)
2428 return -ENODEV;
2429
2430 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2431 Do not dev_put!
1da177e4
LT		 2432 */
2433 if (how == 1) {
1da177e4 2434 idev->dead = 1;
8814c4b5
YH		 2435
2436 /* protected by rtnl_lock */
2437 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2438
2439 /* Step 1.5: remove snmp6 entry */
2440 snmp6_unregister_dev(idev);
2441
2442 }
2443
2444 /* Step 2: clear hash table */
2445 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2446 bifa = &inet6_addr_lst[i];
2447
2448 write_lock_bh(&addrconf_hash_lock);
2449 while ((ifa = *bifa) != NULL) {
2450 if (ifa->idev == idev) {
2451 *bifa = ifa->lst_next;
2452 ifa->lst_next = NULL;
2453 addrconf_del_timer(ifa);
2454 in6_ifa_put(ifa);
2455 continue;
2456 }
2457 bifa = &ifa->lst_next;
2458 }
2459 write_unlock_bh(&addrconf_hash_lock);
2460 }
2461
2462 write_lock_bh(&idev->lock);
2463
2464 /* Step 3: clear flags for stateless addrconf */
2465 if (how != 1)
3c21edbd 2466 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2467
2468 /* Step 4: clear address list */
2469#ifdef CONFIG_IPV6_PRIVACY
2470 if (how == 1 && del_timer(&idev->regen_timer))
2471 in6_dev_put(idev);
2472
2473 /* clear tempaddr list */
2474 while ((ifa = idev->tempaddr_list) != NULL) {
2475 idev->tempaddr_list = ifa->tmp_next;
2476 ifa->tmp_next = NULL;
2477 ifa->dead = 1;
2478 write_unlock_bh(&idev->lock);
2479 spin_lock_bh(&ifa->lock);
2480
2481 if (ifa->ifpub) {
2482 in6_ifa_put(ifa->ifpub);
2483 ifa->ifpub = NULL;
2484 }
2485 spin_unlock_bh(&ifa->lock);
2486 in6_ifa_put(ifa);
2487 write_lock_bh(&idev->lock);
2488 }
2489#endif
2490 while ((ifa = idev->addr_list) != NULL) {
2491 idev->addr_list = ifa->if_next;
2492 ifa->if_next = NULL;
2493 ifa->dead = 1;
2494 addrconf_del_timer(ifa);
2495 write_unlock_bh(&idev->lock);
2496
2497 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2498 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2499 in6_ifa_put(ifa);
2500
2501 write_lock_bh(&idev->lock);
2502 }
2503 write_unlock_bh(&idev->lock);
2504
2505 /* Step 5: Discard multicast list */
2506
2507 if (how == 1)
2508 ipv6_mc_destroy_dev(idev);
2509 else
2510 ipv6_mc_down(idev);
2511
1da177e4 2512 idev->tstamp = jiffies;
1ab1457c 2513
1da177e4
LT		 2514 /* Shot the device (if unregistered) */
2515
2516 if (how == 1) {
2517#ifdef CONFIG_SYSCTL
2518 addrconf_sysctl_unregister(&idev->cnf);
2519 neigh_sysctl_unregister(idev->nd_parms);
2520#endif
2521 neigh_parms_release(&nd_tbl, idev->nd_parms);
2522 neigh_ifdown(&nd_tbl, dev);
2523 in6_dev_put(idev);
2524 }
2525 return 0;
2526}
2527
2528static void addrconf_rs_timer(unsigned long data)
2529{
2530 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2531
2532 if (ifp->idev->cnf.forwarding)
2533 goto out;
2534
2535 if (ifp->idev->if_flags & IF_RA_RCVD) {
2536 /*
2537 * Announcement received after solicitation
2538 * was sent
2539 */
2540 goto out;
2541 }
2542
2543 spin_lock(&ifp->lock);
2544 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2545 struct in6_addr all_routers;
2546
2547 /* The wait after the last probe can be shorter */
2548 addrconf_mod_timer(ifp, AC_RS,
2549 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2550 ifp->idev->cnf.rtr_solicit_delay :
2551 ifp->idev->cnf.rtr_solicit_interval);
2552 spin_unlock(&ifp->lock);
2553
2554 ipv6_addr_all_routers(&all_routers);
2555
2556 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2557 } else {
2558 spin_unlock(&ifp->lock);
2559 /*
2560 * Note: we do not support deprecated "all on-link"
2561 * assumption any longer.
2562 */
2563 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2564 ifp->idev->dev->name);
2565 }
2566
2567out:
2568 in6_ifa_put(ifp);
2569}
2570
2571/*
2572 * Duplicate Address Detection
2573 */
3c21edbd
YH		 2574static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2575{
2576 unsigned long rand_num;
2577 struct inet6_dev *idev = ifp->idev;
2578
95c385b4
NH		 2579 if (ifp->flags & IFA_F_OPTIMISTIC)
2580 rand_num = 0;
2581 else
2582 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2583
3c21edbd
YH		 2584 ifp->probes = idev->cnf.dad_transmits;
2585 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2586}
2587
e431b8c0 2588static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2589{
2590 struct inet6_dev *idev = ifp->idev;
2591 struct net_device *dev = idev->dev;
1da177e4
LT		 2592
2593 addrconf_join_solict(dev, &ifp->addr);
2594
1da177e4 2595 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2596
2597 read_lock_bh(&idev->lock);
2598 if (ifp->dead)
2599 goto out;
2600 spin_lock_bh(&ifp->lock);
2601
2602 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2603 !(ifp->flags&IFA_F_TENTATIVE) ||
2604 ifp->flags & IFA_F_NODAD) {
95c385b4 2605 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2606 spin_unlock_bh(&ifp->lock);
2607 read_unlock_bh(&idev->lock);
2608
2609 addrconf_dad_completed(ifp);
2610 return;
2611 }
2612
6732bade 2613 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2614 spin_unlock_bh(&ifp->lock);
6732bade 2615 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2616 /*
2617 * If the defice is not ready:
2618 * - keep it tentative if it is a permanent address.
2619 * - otherwise, kill it.
2620 */
2621 in6_ifa_hold(ifp);
2622 addrconf_dad_stop(ifp);
6732bade 2623 return;
3c21edbd 2624 }
95c385b4
NH		 2625
2626 /*
2627 * Optimistic nodes can start receiving
2628 * Frames right away
2629 */
2630 if(ifp->flags & IFA_F_OPTIMISTIC)
2631 ip6_ins_rt(ifp->rt);
2632
6732bade
YH		 2633 addrconf_dad_kick(ifp);
2634 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2635out:
2636 read_unlock_bh(&idev->lock);
2637}
2638
2639static void addrconf_dad_timer(unsigned long data)
2640{
2641 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2642 struct inet6_dev *idev = ifp->idev;
2643 struct in6_addr unspec;
2644 struct in6_addr mcaddr;
2645
2646 read_lock_bh(&idev->lock);
2647 if (idev->dead) {
2648 read_unlock_bh(&idev->lock);
2649 goto out;
2650 }
2651 spin_lock_bh(&ifp->lock);
2652 if (ifp->probes == 0) {
2653 /*
2654 * DAD was successful
2655 */
2656
95c385b4 2657 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2658 spin_unlock_bh(&ifp->lock);
2659 read_unlock_bh(&idev->lock);
2660
2661 addrconf_dad_completed(ifp);
2662
2663 goto out;
2664 }
2665
2666 ifp->probes--;
2667 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2668 spin_unlock_bh(&ifp->lock);
2669 read_unlock_bh(&idev->lock);
2670
2671 /* send a neighbour solicitation for our addr */
2672 memset(&unspec, 0, sizeof(unspec));
2673 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2674 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2675out:
2676 in6_ifa_put(ifp);
2677}
2678
2679static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2680{
2681 struct net_device * dev = ifp->idev->dev;
2682
2683 /*
2684 * Configure the address for reception. Now it is valid.
2685 */
2686
2687 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2688
2689 /* If added prefix is link local and forwarding is off,
2690 start sending router solicitations.
2691 */
2692
2693 if (ifp->idev->cnf.forwarding == 0 &&
2694 ifp->idev->cnf.rtr_solicits > 0 &&
2695 (dev->flags&IFF_LOOPBACK) == 0 &&
2696 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2697 struct in6_addr all_routers;
2698
2699 ipv6_addr_all_routers(&all_routers);
2700
2701 /*
2702 * If a host as already performed a random delay
2703 * [...] as part of DAD [...] there is no need
2704 * to delay again before sending the first RS
2705 */
2706 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2707
2708 spin_lock_bh(&ifp->lock);
2709 ifp->probes = 1;
2710 ifp->idev->if_flags |= IF_RS_SENT;
2711 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2712 spin_unlock_bh(&ifp->lock);
2713 }
2714}
2715
c5e33bdd
YH		 2716static void addrconf_dad_run(struct inet6_dev *idev) {
2717 struct inet6_ifaddr *ifp;
2718
2719 read_lock_bh(&idev->lock);
2720 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2721 spin_lock_bh(&ifp->lock);
2722 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2723 spin_unlock_bh(&ifp->lock);
2724 continue;
2725 }
2726 spin_unlock_bh(&ifp->lock);
2727 addrconf_dad_kick(ifp);
2728 }
2729 read_unlock_bh(&idev->lock);
2730}
2731
1da177e4
LT		 2732#ifdef CONFIG_PROC_FS
2733struct if6_iter_state {
2734 int bucket;
2735};
2736
2737static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2738{
2739 struct inet6_ifaddr *ifa = NULL;
2740 struct if6_iter_state *state = seq->private;
2741
2742 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2743 ifa = inet6_addr_lst[state->bucket];
2744 if (ifa)
2745 break;
2746 }
2747 return ifa;
2748}
2749
2750static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2751{
2752 struct if6_iter_state *state = seq->private;
2753
2754 ifa = ifa->lst_next;
2755try_again:
2756 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2757 ifa = inet6_addr_lst[state->bucket];
2758 goto try_again;
2759 }
2760 return ifa;
2761}
2762
2763static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2764{
2765 struct inet6_ifaddr *ifa = if6_get_first(seq);
2766
2767 if (ifa)
2768 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2769 --pos;
2770 return pos ? NULL : ifa;
2771}
2772
2773static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2774{
2775 read_lock_bh(&addrconf_hash_lock);
2776 return if6_get_idx(seq, *pos);
2777}
2778
2779static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2780{
2781 struct inet6_ifaddr *ifa;
2782
2783 ifa = if6_get_next(seq, v);
2784 ++*pos;
2785 return ifa;
2786}
2787
2788static void if6_seq_stop(struct seq_file *seq, void *v)
2789{
2790 read_unlock_bh(&addrconf_hash_lock);
2791}
2792
2793static int if6_seq_show(struct seq_file *seq, void *v)
2794{
2795 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2796 seq_printf(seq,
9343e79a 2797 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2798 NIP6(ifp->addr),
2799 ifp->idev->dev->ifindex,
2800 ifp->prefix_len,
2801 ifp->scope,
2802 ifp->flags,
2803 ifp->idev->dev->name);
2804 return 0;
2805}
2806
56b3d975 2807static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2808 .start = if6_seq_start,
2809 .next = if6_seq_next,
2810 .show = if6_seq_show,
2811 .stop = if6_seq_stop,
2812};
2813
2814static int if6_seq_open(struct inode *inode, struct file *file)
2815{
cf7732e4
PE		 2816 return seq_open_private(file, &if6_seq_ops,
2817 sizeof(struct if6_iter_state));
1da177e4
LT		 2818}
2819
9a32144e 2820static const struct file_operations if6_fops = {
1da177e4
LT		 2821 .owner = THIS_MODULE,
2822 .open = if6_seq_open,
2823 .read = seq_read,
2824 .llseek = seq_lseek,
2825 .release = seq_release_private,
2826};
2827
2828int __init if6_proc_init(void)
2829{
457c4cbc 2830 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2831 return -ENOMEM;
2832 return 0;
2833}
2834
2835void if6_proc_exit(void)
2836{
457c4cbc 2837 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2838}
2839#endif /* CONFIG_PROC_FS */
2840
59fbb3a6 2841#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2842/* Check if address is a home address configured on any interface. */
2843int ipv6_chk_home_addr(struct in6_addr *addr)
2844{
2845 int ret = 0;
2846 struct inet6_ifaddr * ifp;
2847 u8 hash = ipv6_addr_hash(addr);
2848 read_lock_bh(&addrconf_hash_lock);
2849 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2850 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2851 (ifp->flags & IFA_F_HOMEADDRESS)) {
2852 ret = 1;
2853 break;
2854 }
2855 }
2856 read_unlock_bh(&addrconf_hash_lock);
2857 return ret;
2858}
2859#endif
2860
1da177e4
LT		 2861/*
2862 * Periodic address status verification
2863 */
2864
2865static void addrconf_verify(unsigned long foo)
2866{
2867 struct inet6_ifaddr *ifp;
2868 unsigned long now, next;
2869 int i;
2870
2871 spin_lock_bh(&addrconf_verify_lock);
2872 now = jiffies;
2873 next = now + ADDR_CHECK_FREQUENCY;
2874
2875 del_timer(&addr_chk_timer);
2876
2877 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2878
2879restart:
5d5780df 2880 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2881 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2882 unsigned long age;
2883#ifdef CONFIG_IPV6_PRIVACY
2884 unsigned long regen_advance;
2885#endif
2886
2887 if (ifp->flags & IFA_F_PERMANENT)
2888 continue;
2889
2890 spin_lock(&ifp->lock);
2891 age = (now - ifp->tstamp) / HZ;
2892
2893#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2894 regen_advance = ifp->idev->cnf.regen_max_retry *
2895 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2896 ifp->idev->nd_parms->retrans_time / HZ;
2897#endif
2898
8f27ebb9
YH		 2899 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2900 age >= ifp->valid_lft) {
1da177e4
LT		 2901 spin_unlock(&ifp->lock);
2902 in6_ifa_hold(ifp);
5d5780df 2903 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2904 ipv6_del_addr(ifp);
2905 goto restart;
8f27ebb9
YH		 2906 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2907 spin_unlock(&ifp->lock);
2908 continue;
1da177e4
LT		 2909 } else if (age >= ifp->prefered_lft) {
2910 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2911 int deprecate = 0;
2912
2913 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2914 deprecate = 1;
2915 ifp->flags |= IFA_F_DEPRECATED;
2916 }
2917
2918 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2919 next = ifp->tstamp + ifp->valid_lft * HZ;
2920
2921 spin_unlock(&ifp->lock);
2922
2923 if (deprecate) {
2924 in6_ifa_hold(ifp);
5d5780df 2925 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2926
2927 ipv6_ifa_notify(0, ifp);
2928 in6_ifa_put(ifp);
2929 goto restart;
2930 }
2931#ifdef CONFIG_IPV6_PRIVACY
2932 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2933 !(ifp->flags&IFA_F_TENTATIVE)) {
2934 if (age >= ifp->prefered_lft - regen_advance) {
2935 struct inet6_ifaddr *ifpub = ifp->ifpub;
2936 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2937 next = ifp->tstamp + ifp->prefered_lft * HZ;
2938 if (!ifp->regen_count && ifpub) {
2939 ifp->regen_count++;
2940 in6_ifa_hold(ifp);
2941 in6_ifa_hold(ifpub);
2942 spin_unlock(&ifp->lock);
5d5780df 2943 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2944 spin_lock(&ifpub->lock);
2945 ifpub->regen_count = 0;
2946 spin_unlock(&ifpub->lock);
1da177e4
LT		 2947 ipv6_create_tempaddr(ifpub, ifp);
2948 in6_ifa_put(ifpub);
2949 in6_ifa_put(ifp);
2950 goto restart;
2951 }
2952 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2953 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2954 spin_unlock(&ifp->lock);
2955#endif
2956 } else {
2957 /* ifp->prefered_lft <= ifp->valid_lft */
2958 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2959 next = ifp->tstamp + ifp->prefered_lft * HZ;
2960 spin_unlock(&ifp->lock);
2961 }
2962 }
5d5780df 2963 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2964 }
2965
2966 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2967 add_timer(&addr_chk_timer);
2968 spin_unlock_bh(&addrconf_verify_lock);
2969}
2970
461d8837
TG		 2971static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2972{
2973 struct in6_addr *pfx = NULL;
2974
2975 if (addr)
2976 pfx = nla_data(addr);
2977
2978 if (local) {
2979 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2980 pfx = NULL;
2981 else
2982 pfx = nla_data(local);
2983 }
2984
2985 return pfx;
2986}
2987
ef7c79ed 2988static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2989 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2990 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2991 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2992};
2993
1da177e4
LT		 2994static int
2995inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2996{
b933f716
TG		 2997 struct ifaddrmsg *ifm;
2998 struct nlattr *tb[IFA_MAX+1];
1da177e4 2999 struct in6_addr *pfx;
b933f716 3000 int err;
1da177e4 3001
b933f716
TG		 3002 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3003 if (err < 0)
3004 return err;
3005
3006 ifm = nlmsg_data(nlh);
3007 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3008 if (pfx == NULL)
3009 return -EINVAL;
3010
3011 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3012}
3013
55ebaef1
NT		 3014static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3015 u32 prefered_lft, u32 valid_lft)
081bba5b 3016{
46d48046
YH		 3017 u32 flags = RTF_EXPIRES;
3018
081bba5b
NT		 3019 if (!valid_lft || (prefered_lft > valid_lft))
3020 return -EINVAL;
3021
46d48046 3022 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3023 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3024 flags = 0;
3025 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3026 valid_lft = 0x7FFFFFFF/HZ;
3027
3028 if (prefered_lft == 0)
55ebaef1 3029 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3030 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3031 (prefered_lft != INFINITY_LIFE_TIME))
3032 prefered_lft = 0x7FFFFFFF/HZ;
3033
3034 spin_lock_bh(&ifp->lock);
3b9f9a1c 3035 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3036 ifp->tstamp = jiffies;
3037 ifp->valid_lft = valid_lft;
3038 ifp->prefered_lft = prefered_lft;
3039
3040 spin_unlock_bh(&ifp->lock);
3041 if (!(ifp->flags&IFA_F_TENTATIVE))
3042 ipv6_ifa_notify(0, ifp);
081bba5b 3043
46d48046
YH		 3044 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3045 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3046 addrconf_verify(0);
3047
3048 return 0;
3049}
3050
1da177e4
LT		 3051static int
3052inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3053{
461d8837
TG		 3054 struct ifaddrmsg *ifm;
3055 struct nlattr *tb[IFA_MAX+1];
1da177e4 3056 struct in6_addr *pfx;
7198f8ce
TG		 3057 struct inet6_ifaddr *ifa;
3058 struct net_device *dev;
55ebaef1
NT		 3059 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3060 u8 ifa_flags;
461d8837 3061 int err;
1da177e4 3062
461d8837
TG		 3063 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3064 if (err < 0)
3065 return err;
3066
3067 ifm = nlmsg_data(nlh);
3068 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3069 if (pfx == NULL)
3070 return -EINVAL;
3071
461d8837 3072 if (tb[IFA_CACHEINFO]) {
0778769d 3073 struct ifa_cacheinfo *ci;
461d8837
TG		 3074
3075 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3076 valid_lft = ci->ifa_valid;
461d8837
TG		 3077 preferred_lft = ci->ifa_prefered;
3078 } else {
3079 preferred_lft = INFINITY_LIFE_TIME;
3080 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3081 }
3082
881d966b 3083 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3084 if (dev == NULL)
3085 return -ENODEV;
3086
55ebaef1 3087 /* We ignore other flags so far. */
3b9f9a1c 3088 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3089
7198f8ce
TG		 3090 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3091 if (ifa == NULL) {
3092 /*
3093 * It would be best to check for !NLM_F_CREATE here but
3094 * userspace alreay relies on not having to provide this.
3095 */
3096 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3097 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3098 }
3099
7198f8ce
TG		 3100 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3101 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3102 err = -EEXIST;
3103 else
55ebaef1 3104 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3105
3106 in6_ifa_put(ifa);
3107
3108 return err;
1da177e4
LT		 3109}
3110
101bb229
TG		 3111static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3112 u8 scope, int ifindex)
3113{
3114 struct ifaddrmsg *ifm;
3115
3116 ifm = nlmsg_data(nlh);
3117 ifm->ifa_family = AF_INET6;
3118 ifm->ifa_prefixlen = prefixlen;
3119 ifm->ifa_flags = flags;
3120 ifm->ifa_scope = scope;
3121 ifm->ifa_index = ifindex;
3122}
3123
85486af0
TG		 3124static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3125 unsigned long tstamp, u32 preferred, u32 valid)
3126{
3127 struct ifa_cacheinfo ci;
3128
3129 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3130 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3131 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3132 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3133 ci.ifa_prefered = preferred;
3134 ci.ifa_valid = valid;
3135
3136 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3137}
3138
101bb229
TG		 3139static inline int rt_scope(int ifa_scope)
3140{
3141 if (ifa_scope & IFA_HOST)
3142 return RT_SCOPE_HOST;
3143 else if (ifa_scope & IFA_LINK)
3144 return RT_SCOPE_LINK;
3145 else if (ifa_scope & IFA_SITE)
3146 return RT_SCOPE_SITE;
3147 else
3148 return RT_SCOPE_UNIVERSE;
3149}
3150
0ab6803b
TG		 3151static inline int inet6_ifaddr_msgsize(void)
3152{
339bf98f
TG		 3153 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3154 + nla_total_size(16) /* IFA_ADDRESS */
3155 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3156}
c5396a31 3157
1da177e4 3158static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3159 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3160{
1da177e4 3161 struct nlmsghdr *nlh;
85486af0 3162 u32 preferred, valid;
1da177e4 3163
0ab6803b
TG		 3164 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3165 if (nlh == NULL)
26932566 3166 return -EMSGSIZE;
0ab6803b 3167
101bb229
TG		 3168 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3169 ifa->idev->dev->ifindex);
3170
1da177e4 3171 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3172 preferred = ifa->prefered_lft;
3173 valid = ifa->valid_lft;
3174 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3175 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3176 preferred -= tval;
3177 if (valid != INFINITY_LIFE_TIME)
3178 valid -= tval;
1da177e4
LT		 3179 }
3180 } else {
85486af0
TG		 3181 preferred = INFINITY_LIFE_TIME;
3182 valid = INFINITY_LIFE_TIME;
3183 }
3184
0ab6803b 3185 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3186 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3187 nlmsg_cancel(skb, nlh);
3188 return -EMSGSIZE;
3189 }
1da177e4 3190
0ab6803b 3191 return nlmsg_end(skb, nlh);
1da177e4
LT		 3192}
3193
3194static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3195 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3196{
1da177e4 3197 struct nlmsghdr *nlh;
101bb229
TG		 3198 u8 scope = RT_SCOPE_UNIVERSE;
3199 int ifindex = ifmca->idev->dev->ifindex;
3200
3201 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3202 scope = RT_SCOPE_SITE;
1da177e4 3203
0ab6803b
TG		 3204 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3205 if (nlh == NULL)
26932566 3206 return -EMSGSIZE;
85486af0 3207
0ab6803b
TG		 3208 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3209 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3210 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3211 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3212 nlmsg_cancel(skb, nlh);
3213 return -EMSGSIZE;
3214 }
85486af0 3215
0ab6803b 3216 return nlmsg_end(skb, nlh);
1da177e4
LT		 3217}
3218
3219static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3220 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3221{
1da177e4 3222 struct nlmsghdr *nlh;
101bb229
TG		 3223 u8 scope = RT_SCOPE_UNIVERSE;
3224 int ifindex = ifaca->aca_idev->dev->ifindex;
3225
3226 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3227 scope = RT_SCOPE_SITE;
1da177e4 3228
0ab6803b
TG		 3229 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3230 if (nlh == NULL)
26932566 3231 return -EMSGSIZE;
85486af0 3232
0ab6803b
TG		 3233 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3234 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3235 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3236 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3237 nlmsg_cancel(skb, nlh);
3238 return -EMSGSIZE;
3239 }
1da177e4 3240
0ab6803b 3241 return nlmsg_end(skb, nlh);
1da177e4
LT		 3242}
3243
3244enum addr_type_t
3245{
3246 UNICAST_ADDR,
3247 MULTICAST_ADDR,
3248 ANYCAST_ADDR,
3249};
3250
3251static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3252 enum addr_type_t type)
3253{
3254 int idx, ip_idx;
3255 int s_idx, s_ip_idx;
3256 int err = 1;
3257 struct net_device *dev;
3258 struct inet6_dev *idev = NULL;
3259 struct inet6_ifaddr *ifa;
3260 struct ifmcaddr6 *ifmca;
3261 struct ifacaddr6 *ifaca;
3262
3263 s_idx = cb->args[0];
3264 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3265
7562f876 3266 idx = 0;
881d966b 3267 for_each_netdev(&init_net, dev) {
1da177e4 3268 if (idx < s_idx)
7562f876 3269 goto cont;
1da177e4
LT		 3270 if (idx > s_idx)
3271 s_ip_idx = 0;
3272 ip_idx = 0;
3273 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3274 goto cont;
1da177e4
LT		 3275 read_lock_bh(&idev->lock);
3276 switch (type) {
3277 case UNICAST_ADDR:
ae9cda5d 3278 /* unicast address incl. temp addr */
1da177e4
LT		 3279 for (ifa = idev->addr_list; ifa;
3280 ifa = ifa->if_next, ip_idx++) {
3281 if (ip_idx < s_ip_idx)
3282 continue;
1ab1457c
YH		 3283 if ((err = inet6_fill_ifaddr(skb, ifa,
3284 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3285 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3286 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3287 goto done;
3288 }
1da177e4
LT		 3289 break;
3290 case MULTICAST_ADDR:
3291 /* multicast address */
1ab1457c 3292 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3293 ifmca = ifmca->next, ip_idx++) {
3294 if (ip_idx < s_ip_idx)
3295 continue;
1ab1457c
YH		 3296 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3297 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3298 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3299 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3300 goto done;
3301 }
3302 break;
3303 case ANYCAST_ADDR:
3304 /* anycast address */
3305 for (ifaca = idev->ac_list; ifaca;
3306 ifaca = ifaca->aca_next, ip_idx++) {
3307 if (ip_idx < s_ip_idx)
3308 continue;
1ab1457c
YH		 3309 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3310 NETLINK_CB(cb->skb).pid,
b6544c0b 3311 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3312 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3313 goto done;
3314 }
3315 break;
3316 default:
3317 break;
3318 }
3319 read_unlock_bh(&idev->lock);
3320 in6_dev_put(idev);
7562f876
PE		 3321cont:
3322 idx++;
1da177e4
LT		 3323 }
3324done:
3325 if (err <= 0) {
3326 read_unlock_bh(&idev->lock);
3327 in6_dev_put(idev);
3328 }
1da177e4
LT		 3329 cb->args[0] = idx;
3330 cb->args[1] = ip_idx;
3331 return skb->len;
3332}
3333
3334static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3335{
3336 enum addr_type_t type = UNICAST_ADDR;
3337 return inet6_dump_addr(skb, cb, type);
3338}
3339
3340static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3341{
3342 enum addr_type_t type = MULTICAST_ADDR;
3343 return inet6_dump_addr(skb, cb, type);
3344}
3345
3346
3347static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3348{
3349 enum addr_type_t type = ANYCAST_ADDR;
3350 return inet6_dump_addr(skb, cb, type);
3351}
3352
1b29fc2c
TG		 3353static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3354 void *arg)
6c223828 3355{
1b29fc2c
TG		 3356 struct ifaddrmsg *ifm;
3357 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3358 struct in6_addr *addr = NULL;
3359 struct net_device *dev = NULL;
3360 struct inet6_ifaddr *ifa;
3361 struct sk_buff *skb;
6c223828
NT		 3362 int err;
3363
1b29fc2c
TG		 3364 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3365 if (err < 0)
3366 goto errout;
3367
3368 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3369 if (addr == NULL) {
3370 err = -EINVAL;
3371 goto errout;
6c223828 3372 }
6c223828 3373
1b29fc2c 3374 ifm = nlmsg_data(nlh);
6c223828 3375 if (ifm->ifa_index)
881d966b 3376 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3377
1b29fc2c
TG		 3378 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3379 err = -EADDRNOTAVAIL;
3380 goto errout;
3381 }
6c223828 3382
0ab6803b 3383 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3384 err = -ENOBUFS;
1b29fc2c 3385 goto errout_ifa;
6c223828
NT		 3386 }
3387
6c223828
NT		 3388 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3389 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3390 if (err < 0) {
3391 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3392 WARN_ON(err == -EMSGSIZE);
3393 kfree_skb(skb);
3394 goto errout_ifa;
3395 }
2942e900 3396 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3397errout_ifa:
6c223828 3398 in6_ifa_put(ifa);
1b29fc2c 3399errout:
6c223828 3400 return err;
6c223828
NT		 3401}
3402
1da177e4
LT		 3403static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3404{
3405 struct sk_buff *skb;
5d620266 3406 int err = -ENOBUFS;
1da177e4 3407
0ab6803b 3408 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3409 if (skb == NULL)
3410 goto errout;
3411
3412 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3413 if (err < 0) {
3414 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3415 WARN_ON(err == -EMSGSIZE);
3416 kfree_skb(skb);
3417 goto errout;
3418 }
5d620266
TG		 3419 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3420errout:
3421 if (err < 0)
3422 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3423}
3424
b6f99a21 3425static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3426 __s32 *array, int bytes)
3427{
04561c1f
TG		 3428 BUG_ON(bytes < (DEVCONF_MAX * 4));
3429
1da177e4
LT		 3430 memset(array, 0, bytes);
3431 array[DEVCONF_FORWARDING] = cnf->forwarding;
3432 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3433 array[DEVCONF_MTU6] = cnf->mtu6;
3434 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3435 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3436 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3437 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3438 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3439 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3440 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3441 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3442#ifdef CONFIG_IPV6_PRIVACY
3443 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3444 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3445 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3446 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3447 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3448#endif
3449 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3450 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3451 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3452#ifdef CONFIG_IPV6_ROUTER_PREF
3453 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3454 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3455#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3456 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3457#endif
930d6ff2 3458#endif
fbea49e1 3459 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3460 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3461#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3462 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3463#endif
1da177e4
LT		 3464}
3465
339bf98f
TG		 3466static inline size_t inet6_if_nlmsg_size(void)
3467{
3468 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3469 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3470 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3471 + nla_total_size(4) /* IFLA_MTU */
3472 + nla_total_size(4) /* IFLA_LINK */
3473 + nla_total_size( /* IFLA_PROTINFO */
3474 nla_total_size(4) /* IFLA_INET6_FLAGS */
3475 + nla_total_size(sizeof(struct ifla_cacheinfo))
3476 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3477 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3478 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3479 );
3480}
c5396a31 3481
7f7d9a6b
HX		 3482static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3483 int bytes)
3484{
3485 int i;
3486 int pad = bytes - sizeof(u64) * items;
3487 BUG_ON(pad < 0);
3488
3489 /* Use put_unaligned() because stats may not be aligned for u64. */
3490 put_unaligned(items, &stats[0]);
3491 for (i = 1; i < items; i++)
3492 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3493
3494 memset(&stats[items], 0, pad);
3495}
3496
3497static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3498 int bytes)
3499{
3500 switch(attrtype) {
3501 case IFLA_INET6_STATS:
3502 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3503 break;
3504 case IFLA_INET6_ICMP6STATS:
3505 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3506 break;
3507 }
3508}
3509
1ab1457c 3510static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3511 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3512{
04561c1f 3513 struct net_device *dev = idev->dev;
bf99f1bd 3514 struct nlattr *nla;
04561c1f
TG		 3515 struct ifinfomsg *hdr;
3516 struct nlmsghdr *nlh;
3517 void *protoinfo;
3518 struct ifla_cacheinfo ci;
3519
3520 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3521 if (nlh == NULL)
26932566 3522 return -EMSGSIZE;
04561c1f
TG		 3523
3524 hdr = nlmsg_data(nlh);
3525 hdr->ifi_family = AF_INET6;
3526 hdr->__ifi_pad = 0;
3527 hdr->ifi_type = dev->type;
3528 hdr->ifi_index = dev->ifindex;
3529 hdr->ifi_flags = dev_get_flags(dev);
3530 hdr->ifi_change = 0;
3531
3532 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3533
3534 if (dev->addr_len)
04561c1f 3535 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3536
04561c1f 3537 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3538 if (dev->ifindex != dev->iflink)
04561c1f 3539 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3540
04561c1f
TG		 3541 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3542 if (protoinfo == NULL)
3543 goto nla_put_failure;
1da177e4 3544
04561c1f 3545 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3546
1da177e4
LT		 3547 ci.max_reasm_len = IPV6_MAXPLEN;
3548 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3549 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3550 ci.reachable_time = idev->nd_parms->reachable_time;
3551 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3552 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3553
bf99f1bd
YH		 3554 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3555 if (nla == NULL)
04561c1f 3556 goto nla_put_failure;
bf99f1bd 3557 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3558
bf99f1bd
YH		 3559 /* XXX - MC not implemented */
3560
3561 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3562 if (nla == NULL)
3563 goto nla_put_failure;
3564 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3565
3566 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3567 if (nla == NULL)
3568 goto nla_put_failure;
3569 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3570
04561c1f
TG		 3571 nla_nest_end(skb, protoinfo);
3572 return nlmsg_end(skb, nlh);
1da177e4 3573
04561c1f 3574nla_put_failure:
26932566
PM		 3575 nlmsg_cancel(skb, nlh);
3576 return -EMSGSIZE;
1da177e4
LT		 3577}
3578
3579static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3580{
3581 int idx, err;
3582 int s_idx = cb->args[0];
3583 struct net_device *dev;
3584 struct inet6_dev *idev;
3585
3586 read_lock(&dev_base_lock);
7562f876 3587 idx = 0;
881d966b 3588 for_each_netdev(&init_net, dev) {
1da177e4 3589 if (idx < s_idx)
7562f876 3590 goto cont;
1da177e4 3591 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3592 goto cont;
1ab1457c 3593 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3594 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3595 in6_dev_put(idev);
3596 if (err <= 0)
3597 break;
7562f876
PE		 3598cont:
3599 idx++;
1da177e4
LT		 3600 }
3601 read_unlock(&dev_base_lock);
3602 cb->args[0] = idx;
3603
3604 return skb->len;
3605}
3606
3607void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3608{
3609 struct sk_buff *skb;
8d7a76c9 3610 int err = -ENOBUFS;
1ab1457c 3611
339bf98f 3612 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3613 if (skb == NULL)
3614 goto errout;
3615
3616 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3617 if (err < 0) {
3618 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3619 WARN_ON(err == -EMSGSIZE);
3620 kfree_skb(skb);
3621 goto errout;
3622 }
8d7a76c9
TG		 3623 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3624errout:
3625 if (err < 0)
3626 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3627}
3628
339bf98f
TG		 3629static inline size_t inet6_prefix_nlmsg_size(void)
3630{
3631 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3632 + nla_total_size(sizeof(struct in6_addr))
3633 + nla_total_size(sizeof(struct prefix_cacheinfo));
3634}
c5396a31 3635
1da177e4 3636static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3637 struct prefix_info *pinfo, u32 pid, u32 seq,
3638 int event, unsigned int flags)
1da177e4 3639{
6051e2f4
TG		 3640 struct prefixmsg *pmsg;
3641 struct nlmsghdr *nlh;
1da177e4
LT		 3642 struct prefix_cacheinfo ci;
3643
6051e2f4
TG		 3644 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3645 if (nlh == NULL)
26932566 3646 return -EMSGSIZE;
6051e2f4
TG		 3647
3648 pmsg = nlmsg_data(nlh);
1da177e4 3649 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3650 pmsg->prefix_pad1 = 0;
3651 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3652 pmsg->prefix_ifindex = idev->dev->ifindex;
3653 pmsg->prefix_len = pinfo->prefix_len;
3654 pmsg->prefix_type = pinfo->type;
8a47077a 3655 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3656 pmsg->prefix_flags = 0;
3657 if (pinfo->onlink)
3658 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3659 if (pinfo->autoconf)
3660 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3661
6051e2f4 3662 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3663
3664 ci.preferred_time = ntohl(pinfo->prefered);
3665 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3666 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3667
6051e2f4 3668 return nlmsg_end(skb, nlh);
1da177e4 3669
6051e2f4 3670nla_put_failure:
26932566
PM		 3671 nlmsg_cancel(skb, nlh);
3672 return -EMSGSIZE;
1da177e4
LT		 3673}
3674
1ab1457c 3675static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3676 struct prefix_info *pinfo)
3677{
3678 struct sk_buff *skb;
8c384bfa 3679 int err = -ENOBUFS;
1da177e4 3680
339bf98f 3681 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3682 if (skb == NULL)
3683 goto errout;
3684
3685 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3686 if (err < 0) {
3687 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3688 WARN_ON(err == -EMSGSIZE);
3689 kfree_skb(skb);
3690 goto errout;
3691 }
8c384bfa
TG		 3692 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3693errout:
3694 if (err < 0)
3695 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3696}
3697
1da177e4
LT		 3698static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3699{
3700 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3701
3702 switch (event) {
3703 case RTM_NEWADDR:
95c385b4
NH		 3704 /*
3705 * If the address was optimistic
3706 * we inserted the route at the start of
3707 * our DAD process, so we don't need
3708 * to do it again
3709 */
3710 if (!(ifp->rt->rt6i_node))
3711 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3712 if (ifp->idev->cnf.forwarding)
3713 addrconf_join_anycast(ifp);
3714 break;
3715 case RTM_DELADDR:
3716 if (ifp->idev->cnf.forwarding)
3717 addrconf_leave_anycast(ifp);
3718 addrconf_leave_solict(ifp->idev, &ifp->addr);
3719 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3720 if (ip6_del_rt(ifp->rt))
1da177e4 3721 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3722 break;
3723 }
3724}
3725
3726static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3727{
8814c4b5 3728 rcu_read_lock_bh();
1da177e4
LT		 3729 if (likely(ifp->idev->dead == 0))
3730 __ipv6_ifa_notify(event, ifp);
8814c4b5 3731 rcu_read_unlock_bh();
1da177e4
LT		 3732}
3733
3734#ifdef CONFIG_SYSCTL
3735
3736static
3737int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3738 void __user *buffer, size_t *lenp, loff_t *ppos)
3739{
3740 int *valp = ctl->data;
3741 int val = *valp;
3742 int ret;
3743
3744 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3745
3746 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3747 if (valp != &ipv6_devconf.forwarding) {
3748 if ((!*valp) ^ (!val)) {
3749 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3750 if (idev == NULL)
3751 return ret;
3752 dev_forward_change(idev);
3753 }
3754 } else {
3755 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3756 addrconf_forward_change();
3757 }
3758 if (*valp)
3759 rt6_purge_dflt_routers();
3760 }
3761
1ab1457c 3762 return ret;
1da177e4
LT		 3763}
3764
1ab1457c 3765static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3766 int __user *name, int nlen,
3767 void __user *oldval,
3768 size_t __user *oldlenp,
1f29bcd7 3769 void __user *newval, size_t newlen)
1da177e4
LT		 3770{
3771 int *valp = table->data;
3772 int new;
3773
3774 if (!newval || !newlen)
3775 return 0;
3776 if (newlen != sizeof(int))
3777 return -EINVAL;
3778 if (get_user(new, (int __user *)newval))
3779 return -EFAULT;
3780 if (new == *valp)
3781 return 0;
3782 if (oldval && oldlenp) {
3783 size_t len;
3784 if (get_user(len, oldlenp))
3785 return -EFAULT;
3786 if (len) {
3787 if (len > table->maxlen)
3788 len = table->maxlen;
3789 if (copy_to_user(oldval, valp, len))
3790 return -EFAULT;
3791 if (put_user(len, oldlenp))
3792 return -EFAULT;
3793 }
3794 }
3795
3796 if (valp != &ipv6_devconf_dflt.forwarding) {
3797 if (valp != &ipv6_devconf.forwarding) {
3798 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3799 int changed;
3800 if (unlikely(idev == NULL))
3801 return -ENODEV;
3802 changed = (!*valp) ^ (!new);
3803 *valp = new;
3804 if (changed)
3805 dev_forward_change(idev);
3806 } else {
3807 *valp = new;
3808 addrconf_forward_change();
3809 }
3810
3811 if (*valp)
3812 rt6_purge_dflt_routers();
3813 } else
3814 *valp = new;
3815
3816 return 1;
3817}
3818
3819static struct addrconf_sysctl_table
3820{
3821 struct ctl_table_header *sysctl_header;
3822 ctl_table addrconf_vars[__NET_IPV6_MAX];
3823 ctl_table addrconf_dev[2];
3824 ctl_table addrconf_conf_dir[2];
3825 ctl_table addrconf_proto_dir[2];
3826 ctl_table addrconf_root_dir[2];
ab32ea5d 3827} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3828 .sysctl_header = NULL,
3829 .addrconf_vars = {
1ab1457c 3830 {
1da177e4
LT		 3831 .ctl_name = NET_IPV6_FORWARDING,
3832 .procname = "forwarding",
1ab1457c 3833 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3834 .maxlen = sizeof(int),
3835 .mode = 0644,
1ab1457c 3836 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3837 .strategy = &addrconf_sysctl_forward_strategy,
3838 },
3839 {
3840 .ctl_name = NET_IPV6_HOP_LIMIT,
3841 .procname = "hop_limit",
1ab1457c 3842 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3843 .maxlen = sizeof(int),
3844 .mode = 0644,
3845 .proc_handler = proc_dointvec,
3846 },
3847 {
3848 .ctl_name = NET_IPV6_MTU,
3849 .procname = "mtu",
3850 .data = &ipv6_devconf.mtu6,
1ab1457c 3851 .maxlen = sizeof(int),
1da177e4 3852 .mode = 0644,
1ab1457c 3853 .proc_handler = &proc_dointvec,
1da177e4
LT		 3854 },
3855 {
3856 .ctl_name = NET_IPV6_ACCEPT_RA,
3857 .procname = "accept_ra",
1ab1457c 3858 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3859 .maxlen = sizeof(int),
3860 .mode = 0644,
1ab1457c 3861 .proc_handler = &proc_dointvec,
1da177e4
LT		 3862 },
3863 {
3864 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3865 .procname = "accept_redirects",
1ab1457c 3866 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3867 .maxlen = sizeof(int),
3868 .mode = 0644,
1ab1457c 3869 .proc_handler = &proc_dointvec,
1da177e4
LT		 3870 },
3871 {
3872 .ctl_name = NET_IPV6_AUTOCONF,
3873 .procname = "autoconf",
1ab1457c 3874 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3875 .maxlen = sizeof(int),
3876 .mode = 0644,
1ab1457c 3877 .proc_handler = &proc_dointvec,
1da177e4
LT		 3878 },
3879 {
3880 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3881 .procname = "dad_transmits",
1ab1457c 3882 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3883 .maxlen = sizeof(int),
3884 .mode = 0644,
1ab1457c 3885 .proc_handler = &proc_dointvec,
1da177e4
LT		 3886 },
3887 {
3888 .ctl_name = NET_IPV6_RTR_SOLICITS,
3889 .procname = "router_solicitations",
1ab1457c 3890 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3891 .maxlen = sizeof(int),
3892 .mode = 0644,
1ab1457c 3893 .proc_handler = &proc_dointvec,
1da177e4
LT		 3894 },
3895 {
3896 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3897 .procname = "router_solicitation_interval",
1ab1457c 3898 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3899 .maxlen = sizeof(int),
3900 .mode = 0644,
1ab1457c 3901 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3902 .strategy = &sysctl_jiffies,
3903 },
3904 {
3905 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3906 .procname = "router_solicitation_delay",
1ab1457c 3907 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3908 .maxlen = sizeof(int),
3909 .mode = 0644,
1ab1457c 3910 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3911 .strategy = &sysctl_jiffies,
3912 },
3913 {
3914 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3915 .procname = "force_mld_version",
1ab1457c 3916 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3917 .maxlen = sizeof(int),
3918 .mode = 0644,
1ab1457c 3919 .proc_handler = &proc_dointvec,
1da177e4
LT		 3920 },
3921#ifdef CONFIG_IPV6_PRIVACY
3922 {
3923 .ctl_name = NET_IPV6_USE_TEMPADDR,
3924 .procname = "use_tempaddr",
1ab1457c 3925 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3926 .maxlen = sizeof(int),
3927 .mode = 0644,
1ab1457c 3928 .proc_handler = &proc_dointvec,
1da177e4
LT		 3929 },
3930 {
3931 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3932 .procname = "temp_valid_lft",
1ab1457c 3933 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3934 .maxlen = sizeof(int),
3935 .mode = 0644,
1ab1457c 3936 .proc_handler = &proc_dointvec,
1da177e4
LT		 3937 },
3938 {
3939 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3940 .procname = "temp_prefered_lft",
1ab1457c 3941 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3942 .maxlen = sizeof(int),
3943 .mode = 0644,
1ab1457c 3944 .proc_handler = &proc_dointvec,
1da177e4
LT		 3945 },
3946 {
3947 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3948 .procname = "regen_max_retry",
1ab1457c 3949 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3950 .maxlen = sizeof(int),
3951 .mode = 0644,
1ab1457c 3952 .proc_handler = &proc_dointvec,
1da177e4
LT		 3953 },
3954 {
3955 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3956 .procname = "max_desync_factor",
1ab1457c 3957 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3958 .maxlen = sizeof(int),
3959 .mode = 0644,
1ab1457c 3960 .proc_handler = &proc_dointvec,
1da177e4
LT		 3961 },
3962#endif
3963 {
3964 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3965 .procname = "max_addresses",
3966 .data = &ipv6_devconf.max_addresses,
3967 .maxlen = sizeof(int),
3968 .mode = 0644,
3969 .proc_handler = &proc_dointvec,
3970 },
65f5c7c1
YH		 3971 {
3972 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3973 .procname = "accept_ra_defrtr",
1ab1457c 3974 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3975 .maxlen = sizeof(int),
3976 .mode = 0644,
1ab1457c 3977 .proc_handler = &proc_dointvec,
65f5c7c1 3978 },
c4fd30eb
YH		 3979 {
3980 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3981 .procname = "accept_ra_pinfo",
1ab1457c 3982 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3983 .maxlen = sizeof(int),
3984 .mode = 0644,
1ab1457c 3985 .proc_handler = &proc_dointvec,
c4fd30eb 3986 },
930d6ff2
YH		 3987#ifdef CONFIG_IPV6_ROUTER_PREF
3988 {
3989 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3990 .procname = "accept_ra_rtr_pref",
3991 .data = &ipv6_devconf.accept_ra_rtr_pref,
3992 .maxlen = sizeof(int),
3993 .mode = 0644,
3994 .proc_handler = &proc_dointvec,
3995 },
52e16356
YH		 3996 {
3997 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3998 .procname = "router_probe_interval",
3999 .data = &ipv6_devconf.rtr_probe_interval,
4000 .maxlen = sizeof(int),
4001 .mode = 0644,
4002 .proc_handler = &proc_dointvec_jiffies,
4003 .strategy = &sysctl_jiffies,
4004 },
fa03ef38 4005#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4006 {
4007 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4008 .procname = "accept_ra_rt_info_max_plen",
4009 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4010 .maxlen = sizeof(int),
4011 .mode = 0644,
4012 .proc_handler = &proc_dointvec,
4013 },
4014#endif
930d6ff2 4015#endif
fbea49e1
YH		 4016 {
4017 .ctl_name = NET_IPV6_PROXY_NDP,
4018 .procname = "proxy_ndp",
4019 .data = &ipv6_devconf.proxy_ndp,
4020 .maxlen = sizeof(int),
4021 .mode = 0644,
4022 .proc_handler = &proc_dointvec,
4023 },
0bcbc926
YH		 4024 {
4025 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4026 .procname = "accept_source_route",
4027 .data = &ipv6_devconf.accept_source_route,
4028 .maxlen = sizeof(int),
4029 .mode = 0644,
4030 .proc_handler = &proc_dointvec,
4031 },
95c385b4
NH		 4032#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4033 {
4034 .ctl_name = CTL_UNNUMBERED,
4035 .procname = "optimistic_dad",
4036 .data = &ipv6_devconf.optimistic_dad,
4037 .maxlen = sizeof(int),
4038 .mode = 0644,
4039 .proc_handler = &proc_dointvec,
4040
4041 },
4042#endif
1da177e4
LT		 4043 {
4044 .ctl_name = 0, /* sentinel */
4045 }
4046 },
4047 .addrconf_dev = {
4048 {
4049 .ctl_name = NET_PROTO_CONF_ALL,
4050 .procname = "all",
4051 .mode = 0555,
4052 .child = addrconf_sysctl.addrconf_vars,
4053 },
4054 {
4055 .ctl_name = 0, /* sentinel */
4056 }
4057 },
4058 .addrconf_conf_dir = {
4059 {
4060 .ctl_name = NET_IPV6_CONF,
4061 .procname = "conf",
4062 .mode = 0555,
4063 .child = addrconf_sysctl.addrconf_dev,
4064 },
4065 {
4066 .ctl_name = 0, /* sentinel */
4067 }
4068 },
4069 .addrconf_proto_dir = {
4070 {
4071 .ctl_name = NET_IPV6,
4072 .procname = "ipv6",
4073 .mode = 0555,
4074 .child = addrconf_sysctl.addrconf_conf_dir,
4075 },
4076 {
4077 .ctl_name = 0, /* sentinel */
4078 }
4079 },
4080 .addrconf_root_dir = {
4081 {
4082 .ctl_name = CTL_NET,
4083 .procname = "net",
4084 .mode = 0555,
4085 .child = addrconf_sysctl.addrconf_proto_dir,
4086 },
4087 {
4088 .ctl_name = 0, /* sentinel */
4089 }
4090 },
4091};
4092
4093static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4094{
4095 int i;
4096 struct net_device *dev = idev ? idev->dev : NULL;
4097 struct addrconf_sysctl_table *t;
4098 char *dev_name = NULL;
4099
af879cc7 4100 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4101 if (t == NULL)
4102 return;
1da177e4
LT		 4103 for (i=0; t->addrconf_vars[i].data; i++) {
4104 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4105 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4106 }
4107 if (dev) {
1ab1457c 4108 dev_name = dev->name;
1da177e4
LT		 4109 t->addrconf_dev[0].ctl_name = dev->ifindex;
4110 } else {
4111 dev_name = "default";
4112 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4113 }
4114
1ab1457c
YH		 4115 /*
4116 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4117 * by sysctl and we wouldn't want anyone to change it under our feet
4118 * (see SIOCSIFNAME).
1ab1457c 4119 */
543537bd 4120 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4121 if (!dev_name)
4122 goto free;
4123
4124 t->addrconf_dev[0].procname = dev_name;
4125
4126 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4127 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4128 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4129 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4130
0b4d4147 4131 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4132 if (t->sysctl_header == NULL)
4133 goto free_procname;
4134 else
4135 p->sysctl = t;
4136 return;
4137
4138 /* error path */
4139 free_procname:
4140 kfree(dev_name);
4141 free:
4142 kfree(t);
4143
4144 return;
4145}
4146
4147static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4148{
4149 if (p->sysctl) {
4150 struct addrconf_sysctl_table *t = p->sysctl;
4151 p->sysctl = NULL;
4152 unregister_sysctl_table(t->sysctl_header);
4153 kfree(t->addrconf_dev[0].procname);
4154 kfree(t);
4155 }
4156}
4157
4158
4159#endif
4160
4161/*
4162 * Device notifier
4163 */
4164
4165int register_inet6addr_notifier(struct notifier_block *nb)
4166{
1ab1457c 4167 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4168}
4169
7159039a
YH		 4170EXPORT_SYMBOL(register_inet6addr_notifier);
4171
1da177e4
LT		 4172int unregister_inet6addr_notifier(struct notifier_block *nb)
4173{
1ab1457c 4174 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4175}
4176
7159039a
YH		 4177EXPORT_SYMBOL(unregister_inet6addr_notifier);
4178
1da177e4
LT		 4179/*
4180 * Init / cleanup code
4181 */
4182
4183int __init addrconf_init(void)
4184{
4185 int err = 0;
4186
4187 /* The addrconf netdev notifier requires that loopback_dev
4188 * has it's ipv6 private information allocated and setup
4189 * before it can bring up and give link-local addresses
4190 * to other devices which are up.
4191 *
4192 * Unfortunately, loopback_dev is not necessarily the first
4193 * entry in the global dev_base list of net devices. In fact,
4194 * it is likely to be the very last entry on that list.
4195 * So this causes the notifier registry below to try and
4196 * give link-local addresses to all devices besides loopback_dev
4197 * first, then loopback_dev, which cases all the non-loopback_dev
4198 * devices to fail to get a link-local address.
4199 *
4200 * So, as a temporary fix, allocate the ipv6 structure for
4201 * loopback_dev first by hand.
4202 * Longer term, all of the dependencies ipv6 has upon the loopback
4203 * device and it being up should be removed.
4204 */
4205 rtnl_lock();
2774c7ab 4206 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4207 err = -ENOMEM;
4208 rtnl_unlock();
4209 if (err)
4210 return err;
4211
2774c7ab
EB		 4212 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4213 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4214#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4215 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4216 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4217 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4218 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4219#endif
c62dba90 4220
1da177e4
LT		 4221 register_netdevice_notifier(&ipv6_dev_notf);
4222
1da177e4 4223 addrconf_verify(0);
c127ea2c
TG		 4224
4225 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4226 if (err < 0)
4227 goto errout;
4228
4229 /* Only the first call to __rtnl_register can fail */
4230 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4231 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4232 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4233 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4234 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4235
1da177e4
LT		 4236#ifdef CONFIG_SYSCTL
4237 addrconf_sysctl.sysctl_header =
0b4d4147 4238 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4239 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4240#endif
4241
4242 return 0;
c127ea2c
TG		 4243errout:
4244 unregister_netdevice_notifier(&ipv6_dev_notf);
4245
4246 return err;
1da177e4
LT		 4247}
4248
4249void __exit addrconf_cleanup(void)
4250{
1ab1457c 4251 struct net_device *dev;
1ab1457c 4252 struct inet6_ifaddr *ifa;
1da177e4
LT		 4253 int i;
4254
4255 unregister_netdevice_notifier(&ipv6_dev_notf);
4256
1da177e4
LT		 4257#ifdef CONFIG_SYSCTL
4258 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4259 addrconf_sysctl_unregister(&ipv6_devconf);
4260#endif
4261
4262 rtnl_lock();
4263
4264 /*
4265 * clean dev list.
4266 */
4267
881d966b 4268 for_each_netdev(&init_net, dev) {
dffe4f04 4269 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4270 continue;
4271 addrconf_ifdown(dev, 1);
4272 }
2774c7ab 4273 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4274
4275 /*
4276 * Check hash table.
4277 */
4278
4279 write_lock_bh(&addrconf_hash_lock);
4280 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4281 for (ifa=inet6_addr_lst[i]; ifa; ) {
4282 struct inet6_ifaddr *bifa;
4283
4284 bifa = ifa;
4285 ifa = ifa->lst_next;
4286 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4287 /* Do not free it; something is wrong.
4288 Now we can investigate it with debugger.
4289 */
4290 }
4291 }
4292 write_unlock_bh(&addrconf_hash_lock);
4293
4294 del_timer(&addr_chk_timer);
4295
4296 rtnl_unlock();
4297
1da177e4 4298#ifdef CONFIG_PROC_FS
457c4cbc 4299 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 4300#endif
4301}
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