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[net-next-2.6.git] / net / ipv6 / addrconf.c
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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>
1da177e4
LT		 77#include <linux/if_tunnel.h>
78#include <linux/rtnetlink.h>
79
80#ifdef CONFIG_IPV6_PRIVACY
81#include <linux/random.h>
1da177e4
LT		 82#endif
83
84#include <asm/uaccess.h>
7f7d9a6b 85#include <asm/unaligned.h>
1da177e4
LT		 86
87#include <linux/proc_fs.h>
88#include <linux/seq_file.h>
89
90/* Set to 3 to get tracing... */
91#define ACONF_DEBUG 2
92
93#if ACONF_DEBUG >= 3
94#define ADBG(x) printk x
95#else
96#define ADBG(x)
97#endif
98
99#define INFINITY_LIFE_TIME 0xFFFFFFFF
100#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101
102#ifdef CONFIG_SYSCTL
103static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
104static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
105#endif
106
107#ifdef CONFIG_IPV6_PRIVACY
108static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 109static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 110static void ipv6_regen_rndid(unsigned long data);
111
112static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 113#endif
114
115static int ipv6_count_addresses(struct inet6_dev *idev);
116
117/*
118 * Configured unicast address hash table
119 */
120static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
121static DEFINE_RWLOCK(addrconf_hash_lock);
122
1da177e4
LT		 123static void addrconf_verify(unsigned long);
124
8d06afab 125static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 126static DEFINE_SPINLOCK(addrconf_verify_lock);
127
128static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
129static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
130
131static int addrconf_ifdown(struct net_device *dev, int how);
132
e431b8c0 133static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 134static void addrconf_dad_timer(unsigned long data);
135static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 136static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 137static void addrconf_rs_timer(unsigned long data);
138static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
139static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140
1ab1457c 141static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 142 struct prefix_info *pinfo);
143static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
144
e041c683 145static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 146
ab32ea5d 147struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 148 .forwarding = 0,
149 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
150 .mtu6 = IPV6_MIN_MTU,
151 .accept_ra = 1,
152 .accept_redirects = 1,
153 .autoconf = 1,
154 .force_mld_version = 0,
155 .dad_transmits = 1,
156 .rtr_solicits = MAX_RTR_SOLICITATIONS,
157 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
158 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
159#ifdef CONFIG_IPV6_PRIVACY
160 .use_tempaddr = 0,
161 .temp_valid_lft = TEMP_VALID_LIFETIME,
162 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
163 .regen_max_retry = REGEN_MAX_RETRY,
164 .max_desync_factor = MAX_DESYNC_FACTOR,
165#endif
166 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 167 .accept_ra_defrtr = 1,
c4fd30eb 168 .accept_ra_pinfo = 1,
930d6ff2
YH		 169#ifdef CONFIG_IPV6_ROUTER_PREF
170 .accept_ra_rtr_pref = 1,
52e16356 171 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 172#ifdef CONFIG_IPV6_ROUTE_INFO
173 .accept_ra_rt_info_max_plen = 0,
174#endif
930d6ff2 175#endif
fbea49e1 176 .proxy_ndp = 0,
0bcbc926 177 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 178};
179
ab32ea5d 180static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 181 .forwarding = 0,
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
184 .accept_ra = 1,
185 .accept_redirects = 1,
186 .autoconf = 1,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191#ifdef CONFIG_IPV6_PRIVACY
192 .use_tempaddr = 0,
193 .temp_valid_lft = TEMP_VALID_LIFETIME,
194 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
195 .regen_max_retry = REGEN_MAX_RETRY,
196 .max_desync_factor = MAX_DESYNC_FACTOR,
197#endif
198 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 199 .accept_ra_defrtr = 1,
c4fd30eb 200 .accept_ra_pinfo = 1,
930d6ff2
YH		 201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
52e16356 203 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
930d6ff2 207#endif
fbea49e1 208 .proxy_ndp = 0,
0bcbc926 209 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 210};
211
212/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 213const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 214const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
215
1da177e4
LT		 216static void addrconf_del_timer(struct inet6_ifaddr *ifp)
217{
218 if (del_timer(&ifp->timer))
219 __in6_ifa_put(ifp);
220}
221
222enum addrconf_timer_t
223{
224 AC_NONE,
225 AC_DAD,
226 AC_RS,
227};
228
229static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
230 enum addrconf_timer_t what,
231 unsigned long when)
232{
233 if (!del_timer(&ifp->timer))
234 in6_ifa_hold(ifp);
235
236 switch (what) {
237 case AC_DAD:
238 ifp->timer.function = addrconf_dad_timer;
239 break;
240 case AC_RS:
241 ifp->timer.function = addrconf_rs_timer;
242 break;
243 default:;
244 }
245 ifp->timer.expires = jiffies + when;
246 add_timer(&ifp->timer);
247}
248
7f7d9a6b
HX		 249static int snmp6_alloc_dev(struct inet6_dev *idev)
250{
251 int err = -ENOMEM;
252
253 if (!idev || !idev->dev)
254 return -EINVAL;
255
256 if (snmp_mib_init((void **)idev->stats.ipv6,
257 sizeof(struct ipstats_mib),
258 __alignof__(struct ipstats_mib)) < 0)
259 goto err_ip;
260 if (snmp_mib_init((void **)idev->stats.icmpv6,
261 sizeof(struct icmpv6_mib),
262 __alignof__(struct icmpv6_mib)) < 0)
263 goto err_icmp;
264
265 return 0;
266
267err_icmp:
268 snmp_mib_free((void **)idev->stats.ipv6);
269err_ip:
270 return err;
271}
272
273static int snmp6_free_dev(struct inet6_dev *idev)
274{
275 snmp_mib_free((void **)idev->stats.icmpv6);
276 snmp_mib_free((void **)idev->stats.ipv6);
277 return 0;
278}
279
1da177e4
LT		 280/* Nobody refers to this device, we may destroy it. */
281
8814c4b5
YH		 282static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
283{
284 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
285 kfree(idev);
286}
287
1da177e4
LT		 288void in6_dev_finish_destroy(struct inet6_dev *idev)
289{
290 struct net_device *dev = idev->dev;
291 BUG_TRAP(idev->addr_list==NULL);
292 BUG_TRAP(idev->mc_list==NULL);
293#ifdef NET_REFCNT_DEBUG
294 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
295#endif
296 dev_put(dev);
297 if (!idev->dead) {
298 printk("Freeing alive inet6 device %p\n", idev);
299 return;
300 }
301 snmp6_free_dev(idev);
8814c4b5 302 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 303}
304
7159039a
YH		 305EXPORT_SYMBOL(in6_dev_finish_destroy);
306
1da177e4
LT		 307static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
308{
309 struct inet6_dev *ndev;
d88ae4cc 310 struct in6_addr maddr;
1da177e4
LT		 311
312 ASSERT_RTNL();
313
314 if (dev->mtu < IPV6_MIN_MTU)
315 return NULL;
316
1ab1457c 317 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 318
1ab1457c
YH		 319 if (ndev == NULL)
320 return NULL;
322f74a4
IO		 321
322 rwlock_init(&ndev->lock);
323 ndev->dev = dev;
324 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
325 ndev->cnf.mtu6 = dev->mtu;
326 ndev->cnf.sysctl = NULL;
327 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
328 if (ndev->nd_parms == NULL) {
329 kfree(ndev);
330 return NULL;
331 }
332 /* We refer to the device */
333 dev_hold(dev);
1da177e4 334
322f74a4
IO		 335 if (snmp6_alloc_dev(ndev) < 0) {
336 ADBG((KERN_WARNING
337 "%s(): cannot allocate memory for statistics; dev=%s.\n",
338 __FUNCTION__, dev->name));
339 neigh_parms_release(&nd_tbl, ndev->nd_parms);
340 ndev->dead = 1;
341 in6_dev_finish_destroy(ndev);
342 return NULL;
343 }
1da177e4 344
322f74a4
IO		 345 if (snmp6_register_dev(ndev) < 0) {
346 ADBG((KERN_WARNING
347 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
348 __FUNCTION__, dev->name));
349 neigh_parms_release(&nd_tbl, ndev->nd_parms);
350 ndev->dead = 1;
351 in6_dev_finish_destroy(ndev);
352 return NULL;
353 }
354
355 /* One reference from device. We must do this before
356 * we invoke __ipv6_regen_rndid().
357 */
358 in6_dev_hold(ndev);
1da177e4
LT		 359
360#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 361 init_timer(&ndev->regen_timer);
362 ndev->regen_timer.function = ipv6_regen_rndid;
363 ndev->regen_timer.data = (unsigned long) ndev;
364 if ((dev->flags&IFF_LOOPBACK) ||
365 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 366#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
367 dev->type == ARPHRD_SIT ||
368#endif
369 dev->type == ARPHRD_NONE) {
322f74a4
IO		 370 printk(KERN_INFO
371 "%s: Disabled Privacy Extensions\n",
372 dev->name);
373 ndev->cnf.use_tempaddr = -1;
374 } else {
375 in6_dev_hold(ndev);
376 ipv6_regen_rndid((unsigned long) ndev);
377 }
1da177e4
LT		 378#endif
379
53aadcc9
HX		 380 if (netif_running(dev) && netif_carrier_ok(dev))
381 ndev->if_flags |= IF_READY;
382
322f74a4
IO		 383 ipv6_mc_init_dev(ndev);
384 ndev->tstamp = jiffies;
1da177e4 385#ifdef CONFIG_SYSCTL
322f74a4
IO		 386 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
387 NET_IPV6_NEIGH, "ipv6",
388 &ndisc_ifinfo_sysctl_change,
389 NULL);
390 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 391#endif
30c4cf57
DS		 392 /* protected by rtnl_lock */
393 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 394
395 /* Join all-node multicast group */
396 ipv6_addr_all_nodes(&maddr);
397 ipv6_dev_mc_inc(dev, &maddr);
398
1da177e4
LT		 399 return ndev;
400}
401
402static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
403{
404 struct inet6_dev *idev;
405
406 ASSERT_RTNL();
407
408 if ((idev = __in6_dev_get(dev)) == NULL) {
409 if ((idev = ipv6_add_dev(dev)) == NULL)
410 return NULL;
411 }
c5e33bdd 412
1da177e4
LT		 413 if (dev->flags&IFF_UP)
414 ipv6_mc_up(idev);
415 return idev;
416}
417
418#ifdef CONFIG_SYSCTL
419static void dev_forward_change(struct inet6_dev *idev)
420{
421 struct net_device *dev;
422 struct inet6_ifaddr *ifa;
423 struct in6_addr addr;
424
425 if (!idev)
426 return;
427 dev = idev->dev;
428 if (dev && (dev->flags & IFF_MULTICAST)) {
429 ipv6_addr_all_routers(&addr);
1ab1457c 430
1da177e4
LT		 431 if (idev->cnf.forwarding)
432 ipv6_dev_mc_inc(dev, &addr);
433 else
434 ipv6_dev_mc_dec(dev, &addr);
435 }
436 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 437 if (ifa->flags&IFA_F_TENTATIVE)
438 continue;
1da177e4
LT		 439 if (idev->cnf.forwarding)
440 addrconf_join_anycast(ifa);
441 else
442 addrconf_leave_anycast(ifa);
443 }
444}
445
446
447static void addrconf_forward_change(void)
448{
449 struct net_device *dev;
450 struct inet6_dev *idev;
451
452 read_lock(&dev_base_lock);
881d966b 453 for_each_netdev(&init_net, dev) {
8814c4b5 454 rcu_read_lock();
1da177e4
LT		 455 idev = __in6_dev_get(dev);
456 if (idev) {
457 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
458 idev->cnf.forwarding = ipv6_devconf.forwarding;
459 if (changed)
460 dev_forward_change(idev);
461 }
8814c4b5 462 rcu_read_unlock();
1da177e4
LT		 463 }
464 read_unlock(&dev_base_lock);
465}
466#endif
467
468/* Nobody refers to this ifaddr, destroy it */
469
470void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
471{
472 BUG_TRAP(ifp->if_next==NULL);
473 BUG_TRAP(ifp->lst_next==NULL);
474#ifdef NET_REFCNT_DEBUG
475 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
476#endif
477
478 in6_dev_put(ifp->idev);
479
480 if (del_timer(&ifp->timer))
481 printk("Timer is still running, when freeing ifa=%p\n", ifp);
482
483 if (!ifp->dead) {
484 printk("Freeing alive inet6 address %p\n", ifp);
485 return;
486 }
487 dst_release(&ifp->rt->u.dst);
488
489 kfree(ifp);
490}
491
e55ffac6
BH		 492static void
493ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
494{
495 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 496 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 497
498 /*
499 * Each device address list is sorted in order of scope -
500 * global before linklocal.
501 */
502 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
503 ifap = &ifa->if_next) {
8a6ce0c0 504 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 505 break;
506 }
507
508 ifp->if_next = *ifap;
509 *ifap = ifp;
510}
511
1da177e4
LT		 512/* On success it returns ifp with increased reference count */
513
514static struct inet6_ifaddr *
515ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 516 int scope, u32 flags)
1da177e4
LT		 517{
518 struct inet6_ifaddr *ifa = NULL;
519 struct rt6_info *rt;
520 int hash;
521 int err = 0;
522
8814c4b5 523 rcu_read_lock_bh();
1da177e4
LT		 524 if (idev->dead) {
525 err = -ENODEV; /*XXX*/
526 goto out2;
527 }
528
529 write_lock(&addrconf_hash_lock);
530
531 /* Ignore adding duplicate addresses on an interface */
532 if (ipv6_chk_same_addr(addr, idev->dev)) {
533 ADBG(("ipv6_add_addr: already assigned\n"));
534 err = -EEXIST;
535 goto out;
536 }
537
322f74a4 538 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 539
540 if (ifa == NULL) {
541 ADBG(("ipv6_add_addr: malloc failed\n"));
542 err = -ENOBUFS;
543 goto out;
544 }
545
546 rt = addrconf_dst_alloc(idev, addr, 0);
547 if (IS_ERR(rt)) {
548 err = PTR_ERR(rt);
549 goto out;
550 }
551
1da177e4
LT		 552 ipv6_addr_copy(&ifa->addr, addr);
553
554 spin_lock_init(&ifa->lock);
555 init_timer(&ifa->timer);
556 ifa->timer.data = (unsigned long) ifa;
557 ifa->scope = scope;
558 ifa->prefix_len = pfxlen;
559 ifa->flags = flags | IFA_F_TENTATIVE;
560 ifa->cstamp = ifa->tstamp = jiffies;
561
57f5f544
KF		 562 ifa->rt = rt;
563
95c385b4
NH		 564 /*
565 * part one of RFC 4429, section 3.3
566 * We should not configure an address as
567 * optimistic if we do not yet know the link
568 * layer address of our nexhop router
569 */
570
571 if (rt->rt6i_nexthop == NULL)
572 ifa->flags &= ~IFA_F_OPTIMISTIC;
573
1da177e4
LT		 574 ifa->idev = idev;
575 in6_dev_hold(idev);
576 /* For caller */
577 in6_ifa_hold(ifa);
578
579 /* Add to big hash table */
580 hash = ipv6_addr_hash(addr);
581
582 ifa->lst_next = inet6_addr_lst[hash];
583 inet6_addr_lst[hash] = ifa;
584 in6_ifa_hold(ifa);
585 write_unlock(&addrconf_hash_lock);
586
587 write_lock(&idev->lock);
588 /* Add to inet6_dev unicast addr list. */
e55ffac6 589 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 590
591#ifdef CONFIG_IPV6_PRIVACY
592 if (ifa->flags&IFA_F_TEMPORARY) {
593 ifa->tmp_next = idev->tempaddr_list;
594 idev->tempaddr_list = ifa;
595 in6_ifa_hold(ifa);
596 }
597#endif
598
1da177e4
LT		 599 in6_ifa_hold(ifa);
600 write_unlock(&idev->lock);
601out2:
8814c4b5 602 rcu_read_unlock_bh();
1da177e4 603
fd92833a 604 if (likely(err == 0))
e041c683 605 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 606 else {
607 kfree(ifa);
608 ifa = ERR_PTR(err);
609 }
610
611 return ifa;
612out:
613 write_unlock(&addrconf_hash_lock);
614 goto out2;
615}
616
617/* This function wants to get referenced ifp and releases it before return */
618
619static void ipv6_del_addr(struct inet6_ifaddr *ifp)
620{
621 struct inet6_ifaddr *ifa, **ifap;
622 struct inet6_dev *idev = ifp->idev;
623 int hash;
624 int deleted = 0, onlink = 0;
625 unsigned long expires = jiffies;
626
627 hash = ipv6_addr_hash(&ifp->addr);
628
629 ifp->dead = 1;
630
631 write_lock_bh(&addrconf_hash_lock);
632 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
633 ifap = &ifa->lst_next) {
634 if (ifa == ifp) {
635 *ifap = ifa->lst_next;
636 __in6_ifa_put(ifp);
637 ifa->lst_next = NULL;
638 break;
639 }
640 }
641 write_unlock_bh(&addrconf_hash_lock);
642
643 write_lock_bh(&idev->lock);
644#ifdef CONFIG_IPV6_PRIVACY
645 if (ifp->flags&IFA_F_TEMPORARY) {
646 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
647 ifap = &ifa->tmp_next) {
648 if (ifa == ifp) {
649 *ifap = ifa->tmp_next;
650 if (ifp->ifpub) {
651 in6_ifa_put(ifp->ifpub);
652 ifp->ifpub = NULL;
653 }
654 __in6_ifa_put(ifp);
655 ifa->tmp_next = NULL;
656 break;
657 }
658 }
659 }
660#endif
661
1d142804 662 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 663 if (ifa == ifp) {
664 *ifap = ifa->if_next;
665 __in6_ifa_put(ifp);
666 ifa->if_next = NULL;
667 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
668 break;
669 deleted = 1;
1d142804 670 continue;
1da177e4
LT		 671 } else if (ifp->flags & IFA_F_PERMANENT) {
672 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
673 ifp->prefix_len)) {
674 if (ifa->flags & IFA_F_PERMANENT) {
675 onlink = 1;
676 if (deleted)
677 break;
678 } else {
679 unsigned long lifetime;
680
681 if (!onlink)
682 onlink = -1;
683
684 spin_lock(&ifa->lock);
685 lifetime = min_t(unsigned long,
686 ifa->valid_lft, 0x7fffffffUL/HZ);
687 if (time_before(expires,
688 ifa->tstamp + lifetime * HZ))
689 expires = ifa->tstamp + lifetime * HZ;
690 spin_unlock(&ifa->lock);
691 }
692 }
693 }
1d142804 694 ifap = &ifa->if_next;
1da177e4
LT		 695 }
696 write_unlock_bh(&idev->lock);
697
698 ipv6_ifa_notify(RTM_DELADDR, ifp);
699
e041c683 700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 701
702 addrconf_del_timer(ifp);
703
704 /*
705 * Purge or update corresponding prefix
706 *
707 * 1) we don't purge prefix here if address was not permanent.
708 * prefix is managed by its own lifetime.
709 * 2) if there're no addresses, delete prefix.
710 * 3) if there're still other permanent address(es),
711 * corresponding prefix is still permanent.
712 * 4) otherwise, update prefix lifetime to the
713 * longest valid lifetime among the corresponding
714 * addresses on the device.
715 * Note: subsequent RA will update lifetime.
716 *
717 * --yoshfuji
718 */
719 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
720 struct in6_addr prefix;
721 struct rt6_info *rt;
722
723 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
724 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
725
726 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
727 if (onlink == 0) {
e0a1ad73 728 ip6_del_rt(rt);
1da177e4
LT		 729 rt = NULL;
730 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
731 rt->rt6i_expires = expires;
732 rt->rt6i_flags |= RTF_EXPIRES;
733 }
734 }
735 dst_release(&rt->u.dst);
736 }
737
738 in6_ifa_put(ifp);
739}
740
741#ifdef CONFIG_IPV6_PRIVACY
742static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
743{
744 struct inet6_dev *idev = ifp->idev;
745 struct in6_addr addr, *tmpaddr;
746 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
747 int tmp_plen;
748 int ret = 0;
749 int max_addresses;
95c385b4 750 u32 addr_flags;
1da177e4
LT		 751
752 write_lock(&idev->lock);
753 if (ift) {
754 spin_lock_bh(&ift->lock);
755 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
756 spin_unlock_bh(&ift->lock);
757 tmpaddr = &addr;
758 } else {
759 tmpaddr = NULL;
760 }
761retry:
762 in6_dev_hold(idev);
763 if (idev->cnf.use_tempaddr <= 0) {
764 write_unlock(&idev->lock);
765 printk(KERN_INFO
766 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
767 in6_dev_put(idev);
768 ret = -1;
769 goto out;
770 }
771 spin_lock_bh(&ifp->lock);
772 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
773 idev->cnf.use_tempaddr = -1; /*XXX*/
774 spin_unlock_bh(&ifp->lock);
775 write_unlock(&idev->lock);
776 printk(KERN_WARNING
777 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
778 in6_dev_put(idev);
779 ret = -1;
780 goto out;
781 }
782 in6_ifa_hold(ifp);
783 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
784 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
785 spin_unlock_bh(&ifp->lock);
786 write_unlock(&idev->lock);
787 printk(KERN_WARNING
788 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
789 in6_ifa_put(ifp);
790 in6_dev_put(idev);
791 ret = -1;
792 goto out;
793 }
794 memcpy(&addr.s6_addr[8], idev->rndid, 8);
795 tmp_valid_lft = min_t(__u32,
796 ifp->valid_lft,
797 idev->cnf.temp_valid_lft);
1ab1457c
YH		 798 tmp_prefered_lft = min_t(__u32,
799 ifp->prefered_lft,
1da177e4
LT		 800 idev->cnf.temp_prefered_lft - desync_factor / HZ);
801 tmp_plen = ifp->prefix_len;
802 max_addresses = idev->cnf.max_addresses;
803 tmp_cstamp = ifp->cstamp;
804 tmp_tstamp = ifp->tstamp;
805 spin_unlock_bh(&ifp->lock);
806
807 write_unlock(&idev->lock);
95c385b4
NH		 808
809 addr_flags = IFA_F_TEMPORARY;
810 /* set in addrconf_prefix_rcv() */
811 if (ifp->flags & IFA_F_OPTIMISTIC)
812 addr_flags |= IFA_F_OPTIMISTIC;
813
1da177e4 814 ift = !max_addresses ||
1ab1457c 815 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 816 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 817 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
818 addr_flags) : NULL;
1da177e4
LT		 819 if (!ift || IS_ERR(ift)) {
820 in6_ifa_put(ifp);
821 in6_dev_put(idev);
822 printk(KERN_INFO
823 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
824 tmpaddr = &addr;
825 write_lock(&idev->lock);
826 goto retry;
827 }
828
829 spin_lock_bh(&ift->lock);
830 ift->ifpub = ifp;
831 ift->valid_lft = tmp_valid_lft;
832 ift->prefered_lft = tmp_prefered_lft;
833 ift->cstamp = tmp_cstamp;
834 ift->tstamp = tmp_tstamp;
835 spin_unlock_bh(&ift->lock);
836
837 addrconf_dad_start(ift, 0);
838 in6_ifa_put(ift);
839 in6_dev_put(idev);
840out:
841 return ret;
842}
843#endif
844
845/*
072047e4 846 * Choose an appropriate source address (RFC3484)
1da177e4 847 */
072047e4
YH		 848struct ipv6_saddr_score {
849 int addr_type;
850 unsigned int attrs;
851 int matchlen;
0d27b427 852 int scope;
072047e4
YH		 853 unsigned int rule;
854};
855
856#define IPV6_SADDR_SCORE_LOCAL 0x0001
857#define IPV6_SADDR_SCORE_PREFERRED 0x0004
858#define IPV6_SADDR_SCORE_HOA 0x0008
859#define IPV6_SADDR_SCORE_OIF 0x0010
860#define IPV6_SADDR_SCORE_LABEL 0x0020
861#define IPV6_SADDR_SCORE_PRIVACY 0x0040
862
b6f99a21 863static inline int ipv6_saddr_preferred(int type)
1da177e4 864{
072047e4
YH		 865 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
866 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
867 return 1;
868 return 0;
1da177e4
LT		 869}
870
072047e4 871/* static matching label */
b6f99a21 872static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 873{
874 /*
875 * prefix (longest match) label
876 * -----------------------------
877 * ::1/128 0
878 * ::/0 1
879 * 2002::/16 2
880 * ::/96 3
881 * ::ffff:0:0/96 4
102128e3
ŁS		 882 * fc00::/7 5
883 * 2001::/32 6
072047e4
YH		 884 */
885 if (type & IPV6_ADDR_LOOPBACK)
886 return 0;
887 else if (type & IPV6_ADDR_COMPATv4)
888 return 3;
889 else if (type & IPV6_ADDR_MAPPED)
890 return 4;
102128e3
ŁS		 891 else if (addr->s6_addr32[0] == htonl(0x20010000))
892 return 6;
072047e4
YH		 893 else if (addr->s6_addr16[0] == htons(0x2002))
894 return 2;
102128e3
ŁS		 895 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
896 return 5;
072047e4
YH		 897 return 1;
898}
1da177e4 899
072047e4 900int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 901 struct in6_addr *daddr, struct in6_addr *saddr)
902{
072047e4
YH		 903 struct ipv6_saddr_score hiscore;
904 struct inet6_ifaddr *ifa_result = NULL;
905 int daddr_type = __ipv6_addr_type(daddr);
906 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
907 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
908 struct net_device *dev;
1da177e4 909
072047e4 910 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 911
072047e4 912 read_lock(&dev_base_lock);
8814c4b5 913 rcu_read_lock();
1da177e4 914
881d966b 915 for_each_netdev(&init_net, dev) {
072047e4
YH		 916 struct inet6_dev *idev;
917 struct inet6_ifaddr *ifa;
918
919 /* Rule 0: Candidate Source Address (section 4)
920 * - multicast and link-local destination address,
921 * the set of candidate source address MUST only
922 * include addresses assigned to interfaces
923 * belonging to the same link as the outgoing
924 * interface.
925 * (- For site-local destination addresses, the
926 * set of candidate source addresses MUST only
927 * include addresses assigned to interfaces
928 * belonging to the same site as the outgoing
929 * interface.)
930 */
931 if ((daddr_type & IPV6_ADDR_MULTICAST ||
932 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
933 daddr_dev && dev != daddr_dev)
934 continue;
1da177e4 935
1da177e4 936 idev = __in6_dev_get(dev);
072047e4
YH		 937 if (!idev)
938 continue;
939
940 read_lock_bh(&idev->lock);
941 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
942 struct ipv6_saddr_score score;
943
944 score.addr_type = __ipv6_addr_type(&ifa->addr);
945
6b3ae80a
YH		 946 /* Rule 0:
947 * - Tentative Address (RFC2462 section 5.4)
948 * - A tentative address is not considered
949 * "assigned to an interface" in the traditional
95c385b4 950 * sense, unless it is also flagged as optimistic.
6b3ae80a 951 * - Candidate Source Address (section 4)
072047e4
YH		 952 * - In any case, anycast addresses, multicast
953 * addresses, and the unspecified address MUST
954 * NOT be included in a candidate set.
955 */
95c385b4
NH		 956 if ((ifa->flags & IFA_F_TENTATIVE) &&
957 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 958 continue;
072047e4
YH		 959 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
960 score.addr_type & IPV6_ADDR_MULTICAST)) {
961 LIMIT_NETDEBUG(KERN_DEBUG
962 "ADDRCONF: unspecified / multicast address"
963 "assigned as unicast address on %s",
964 dev->name);
965 continue;
966 }
967
968 score.attrs = 0;
969 score.matchlen = 0;
970 score.scope = 0;
971 score.rule = 0;
972
973 if (ifa_result == NULL) {
974 /* record it if the first available entry */
975 goto record_it;
976 }
977
978 /* Rule 1: Prefer same address */
979 if (hiscore.rule < 1) {
980 if (ipv6_addr_equal(&ifa_result->addr, daddr))
981 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
982 hiscore.rule++;
983 }
984 if (ipv6_addr_equal(&ifa->addr, daddr)) {
985 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
987 score.rule = 1;
988 goto record_it;
1da177e4 989 }
072047e4
YH		 990 } else {
991 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
992 continue;
1da177e4 993 }
1da177e4 994
072047e4
YH		 995 /* Rule 2: Prefer appropriate scope */
996 if (hiscore.rule < 2) {
997 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
998 hiscore.rule++;
999 }
1000 score.scope = __ipv6_addr_src_scope(score.addr_type);
1001 if (hiscore.scope < score.scope) {
1002 if (hiscore.scope < daddr_scope) {
1003 score.rule = 2;
1004 goto record_it;
1005 } else
1006 continue;
1007 } else if (score.scope < hiscore.scope) {
1008 if (score.scope < daddr_scope)
e55ffac6 1009 break; /* addresses sorted by scope */
072047e4
YH		 1010 else {
1011 score.rule = 2;
1012 goto record_it;
1013 }
1014 }
1da177e4 1015
95c385b4 1016 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1017 if (hiscore.rule < 3) {
1018 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1019 (((ifa_result->flags &
1020 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1021 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1022 hiscore.rule++;
1023 }
1024 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1025 (((ifa->flags &
95c385b4 1026 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1027 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1029 score.rule = 3;
1030 goto record_it;
1031 }
1032 } else {
1033 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1034 continue;
1035 }
1da177e4 1036
3b9f9a1c 1037 /* Rule 4: Prefer home address */
59fbb3a6 1038#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1039 if (hiscore.rule < 4) {
1040 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1041 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1042 hiscore.rule++;
1043 }
1044 if (ifa->flags & IFA_F_HOMEADDRESS) {
1045 score.attrs |= IPV6_SADDR_SCORE_HOA;
1046 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1047 score.rule = 4;
1048 goto record_it;
1049 }
1050 } else {
1051 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1052 continue;
1053 }
1054#else
220bbd74
YH		 1055 if (hiscore.rule < 4)
1056 hiscore.rule++;
3b9f9a1c 1057#endif
072047e4
YH		 1058
1059 /* Rule 5: Prefer outgoing interface */
1060 if (hiscore.rule < 5) {
1061 if (daddr_dev == NULL ||
1062 daddr_dev == ifa_result->idev->dev)
1063 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1064 hiscore.rule++;
1065 }
1066 if (daddr_dev == NULL ||
1067 daddr_dev == ifa->idev->dev) {
1068 score.attrs |= IPV6_SADDR_SCORE_OIF;
1069 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1070 score.rule = 5;
1071 goto record_it;
1072 }
1073 } else {
1074 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1075 continue;
1076 }
1077
1078 /* Rule 6: Prefer matching label */
1079 if (hiscore.rule < 6) {
1080 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1081 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1082 hiscore.rule++;
1083 }
1084 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1085 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1086 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1087 score.rule = 6;
1088 goto record_it;
1da177e4 1089 }
072047e4
YH		 1090 } else {
1091 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1092 continue;
1093 }
1094
44fd0261 1095#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1096 /* Rule 7: Prefer public address
1097 * Note: prefer temprary address if use_tempaddr >= 2
1098 */
1099 if (hiscore.rule < 7) {
1100 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1101 (ifa_result->idev->cnf.use_tempaddr >= 2))
1102 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1103 hiscore.rule++;
1104 }
1105 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1106 (ifa->idev->cnf.use_tempaddr >= 2)) {
1107 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1108 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1109 score.rule = 7;
1110 goto record_it;
1111 }
1112 } else {
1113 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1114 continue;
1115 }
5e2707fa
YH		 1116#else
1117 if (hiscore.rule < 7)
1118 hiscore.rule++;
44fd0261 1119#endif
072047e4 1120 /* Rule 8: Use longest matching prefix */
12da2a43 1121 if (hiscore.rule < 8) {
072047e4 1122 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1123 hiscore.rule++;
1124 }
072047e4
YH		 1125 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1126 if (score.matchlen > hiscore.matchlen) {
1127 score.rule = 8;
1128 goto record_it;
1da177e4 1129 }
072047e4
YH		 1130#if 0
1131 else if (score.matchlen < hiscore.matchlen)
1132 continue;
1133#endif
1134
1135 /* Final Rule: choose first available one */
1136 continue;
1137record_it:
1138 if (ifa_result)
1139 in6_ifa_put(ifa_result);
1140 in6_ifa_hold(ifa);
1141 ifa_result = ifa;
1142 hiscore = score;
1da177e4 1143 }
072047e4 1144 read_unlock_bh(&idev->lock);
1da177e4 1145 }
8814c4b5 1146 rcu_read_unlock();
1da177e4
LT		 1147 read_unlock(&dev_base_lock);
1148
072047e4
YH		 1149 if (!ifa_result)
1150 return -EADDRNOTAVAIL;
1ab1457c 1151
072047e4
YH		 1152 ipv6_addr_copy(saddr, &ifa_result->addr);
1153 in6_ifa_put(ifa_result);
1154 return 0;
1da177e4
LT		 1155}
1156
1157
1158int ipv6_get_saddr(struct dst_entry *dst,
1159 struct in6_addr *daddr, struct in6_addr *saddr)
1160{
7a3025b1 1161 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1162}
1163
7159039a 1164EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1165
95c385b4
NH		 1166int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1167 unsigned char banned_flags)
1da177e4
LT		 1168{
1169 struct inet6_dev *idev;
1170 int err = -EADDRNOTAVAIL;
1171
8814c4b5 1172 rcu_read_lock();
1da177e4
LT		 1173 if ((idev = __in6_dev_get(dev)) != NULL) {
1174 struct inet6_ifaddr *ifp;
1175
1176 read_lock_bh(&idev->lock);
1177 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1178 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1179 ipv6_addr_copy(addr, &ifp->addr);
1180 err = 0;
1181 break;
1182 }
1183 }
1184 read_unlock_bh(&idev->lock);
1185 }
8814c4b5 1186 rcu_read_unlock();
1da177e4
LT		 1187 return err;
1188}
1189
1190static int ipv6_count_addresses(struct inet6_dev *idev)
1191{
1192 int cnt = 0;
1193 struct inet6_ifaddr *ifp;
1194
1195 read_lock_bh(&idev->lock);
1196 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1197 cnt++;
1198 read_unlock_bh(&idev->lock);
1199 return cnt;
1200}
1201
1202int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1203{
1204 struct inet6_ifaddr * ifp;
1205 u8 hash = ipv6_addr_hash(addr);
1206
1207 read_lock_bh(&addrconf_hash_lock);
1208 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1209 if (ipv6_addr_equal(&ifp->addr, addr) &&
1210 !(ifp->flags&IFA_F_TENTATIVE)) {
1211 if (dev == NULL || ifp->idev->dev == dev ||
1212 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1213 break;
1214 }
1215 }
1216 read_unlock_bh(&addrconf_hash_lock);
1217 return ifp != NULL;
1218}
1219
7159039a
YH		 1220EXPORT_SYMBOL(ipv6_chk_addr);
1221
1da177e4
LT		 1222static
1223int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1224{
1225 struct inet6_ifaddr * ifp;
1226 u8 hash = ipv6_addr_hash(addr);
1227
1228 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1229 if (ipv6_addr_equal(&ifp->addr, addr)) {
1230 if (dev == NULL || ifp->idev->dev == dev)
1231 break;
1232 }
1233 }
1234 return ifp != NULL;
1235}
1236
1237struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1238{
1239 struct inet6_ifaddr * ifp;
1240 u8 hash = ipv6_addr_hash(addr);
1241
1242 read_lock_bh(&addrconf_hash_lock);
1243 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1244 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245 if (dev == NULL || ifp->idev->dev == dev ||
1246 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1247 in6_ifa_hold(ifp);
1248 break;
1249 }
1250 }
1251 }
1252 read_unlock_bh(&addrconf_hash_lock);
1253
1254 return ifp;
1255}
1256
1257int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1258{
1259 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1260 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1261 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1262 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1263 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1264 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1265 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1266 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1267
1268 if (!sk2_rcv_saddr && !sk_ipv6only)
1269 return 1;
1270
1271 if (addr_type2 == IPV6_ADDR_ANY &&
1272 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1273 return 1;
1274
1275 if (addr_type == IPV6_ADDR_ANY &&
1276 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1277 return 1;
1278
1279 if (sk2_rcv_saddr6 &&
1280 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1281 return 1;
1282
1283 if (addr_type == IPV6_ADDR_MAPPED &&
1284 !sk2_ipv6only &&
1285 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1286 return 1;
1287
1288 return 0;
1289}
1290
1291/* Gets referenced address, destroys ifaddr */
1292
9f5336e2 1293static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1294{
1da177e4
LT		 1295 if (ifp->flags&IFA_F_PERMANENT) {
1296 spin_lock_bh(&ifp->lock);
1297 addrconf_del_timer(ifp);
1298 ifp->flags |= IFA_F_TENTATIVE;
1299 spin_unlock_bh(&ifp->lock);
1300 in6_ifa_put(ifp);
1301#ifdef CONFIG_IPV6_PRIVACY
1302 } else if (ifp->flags&IFA_F_TEMPORARY) {
1303 struct inet6_ifaddr *ifpub;
1304 spin_lock_bh(&ifp->lock);
1305 ifpub = ifp->ifpub;
1306 if (ifpub) {
1307 in6_ifa_hold(ifpub);
1308 spin_unlock_bh(&ifp->lock);
1309 ipv6_create_tempaddr(ifpub, ifp);
1310 in6_ifa_put(ifpub);
1311 } else {
1312 spin_unlock_bh(&ifp->lock);
1313 }
1314 ipv6_del_addr(ifp);
1315#endif
1316 } else
1317 ipv6_del_addr(ifp);
1318}
1319
3c21edbd
YH		 1320void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1321{
1322 if (net_ratelimit())
1323 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1324 addrconf_dad_stop(ifp);
1325}
1da177e4
LT		 1326
1327/* Join to solicited addr multicast group. */
1328
1329void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1330{
1331 struct in6_addr maddr;
1332
1333 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1334 return;
1335
1336 addrconf_addr_solict_mult(addr, &maddr);
1337 ipv6_dev_mc_inc(dev, &maddr);
1338}
1339
1340void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1341{
1342 struct in6_addr maddr;
1343
1344 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1345 return;
1346
1347 addrconf_addr_solict_mult(addr, &maddr);
1348 __ipv6_dev_mc_dec(idev, &maddr);
1349}
1350
20380731 1351static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1352{
1353 struct in6_addr addr;
1354 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1355 if (ipv6_addr_any(&addr))
1356 return;
1357 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1358}
1359
20380731 1360static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1361{
1362 struct in6_addr addr;
1363 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1364 if (ipv6_addr_any(&addr))
1365 return;
1366 __ipv6_dev_ac_dec(ifp->idev, &addr);
1367}
1368
073a8e0e
YH		 1369static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1370{
1371 if (dev->addr_len != ETH_ALEN)
1372 return -1;
1373 memcpy(eui, dev->dev_addr, 3);
1374 memcpy(eui + 5, dev->dev_addr + 3, 3);
1375
1376 /*
1377 * The zSeries OSA network cards can be shared among various
1378 * OS instances, but the OSA cards have only one MAC address.
1379 * This leads to duplicate address conflicts in conjunction
1380 * with IPv6 if more than one instance uses the same card.
1381 *
1382 * The driver for these cards can deliver a unique 16-bit
1383 * identifier for each instance sharing the same card. It is
1384 * placed instead of 0xFFFE in the interface identifier. The
1385 * "u" bit of the interface identifier is not inverted in this
1386 * case. Hence the resulting interface identifier has local
1387 * scope according to RFC2373.
1388 */
1389 if (dev->dev_id) {
1390 eui[3] = (dev->dev_id >> 8) & 0xFF;
1391 eui[4] = dev->dev_id & 0xFF;
1392 } else {
1393 eui[3] = 0xFF;
1394 eui[4] = 0xFE;
1395 eui[0] ^= 2;
1396 }
1397 return 0;
1398}
1399
1400static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1401{
1402 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1403 if (dev->addr_len != ARCNET_ALEN)
1404 return -1;
1405 memset(eui, 0, 7);
1406 eui[7] = *(u8*)dev->dev_addr;
1407 return 0;
1408}
1409
1410static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1411{
1412 if (dev->addr_len != INFINIBAND_ALEN)
1413 return -1;
1414 memcpy(eui, dev->dev_addr + 12, 8);
1415 eui[0] |= 2;
1416 return 0;
1417}
1418
1da177e4
LT		 1419static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1420{
1421 switch (dev->type) {
1422 case ARPHRD_ETHER:
1423 case ARPHRD_FDDI:
1424 case ARPHRD_IEEE802_TR:
073a8e0e 1425 return addrconf_ifid_eui48(eui, dev);
1da177e4 1426 case ARPHRD_ARCNET:
073a8e0e 1427 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1428 case ARPHRD_INFINIBAND:
073a8e0e 1429 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1430 }
1431 return -1;
1432}
1433
1434static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1435{
1436 int err = -1;
1437 struct inet6_ifaddr *ifp;
1438
1439 read_lock_bh(&idev->lock);
1440 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1441 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1442 memcpy(eui, ifp->addr.s6_addr+8, 8);
1443 err = 0;
1444 break;
1445 }
1446 }
1447 read_unlock_bh(&idev->lock);
1448 return err;
1449}
1450
1451#ifdef CONFIG_IPV6_PRIVACY
1452/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1453static int __ipv6_regen_rndid(struct inet6_dev *idev)
1454{
1da177e4 1455regen:
955189ef 1456 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1457 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1458
1459 /*
1460 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1461 * check if generated address is not inappropriate
1462 *
1463 * - Reserved subnet anycast (RFC 2526)
1464 * 11111101 11....11 1xxxxxxx
1465 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1466 * 00-00-5E-FE-xx-xx-xx-xx
1467 * - value 0
1468 * - XXX: already assigned to an address on the device
1469 */
1ab1457c 1470 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1471 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1472 (idev->rndid[7]&0x80))
1473 goto regen;
1474 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1475 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1476 goto regen;
1477 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1478 goto regen;
1479 }
1480
1481 return 0;
1482}
1483
1484static void ipv6_regen_rndid(unsigned long data)
1485{
1486 struct inet6_dev *idev = (struct inet6_dev *) data;
1487 unsigned long expires;
1488
8814c4b5 1489 rcu_read_lock_bh();
1da177e4
LT		 1490 write_lock_bh(&idev->lock);
1491
1492 if (idev->dead)
1493 goto out;
1494
1495 if (__ipv6_regen_rndid(idev) < 0)
1496 goto out;
1ab1457c 1497
1da177e4 1498 expires = jiffies +
1ab1457c 1499 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1500 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1501 if (time_before(expires, jiffies)) {
1502 printk(KERN_WARNING
1503 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1504 idev->dev->name);
1505 goto out;
1506 }
1507
1508 if (!mod_timer(&idev->regen_timer, expires))
1509 in6_dev_hold(idev);
1510
1511out:
1512 write_unlock_bh(&idev->lock);
8814c4b5 1513 rcu_read_unlock_bh();
1da177e4
LT		 1514 in6_dev_put(idev);
1515}
1516
1517static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1518 int ret = 0;
1519
1520 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1521 ret = __ipv6_regen_rndid(idev);
1522 return ret;
1523}
1524#endif
1525
1526/*
1527 * Add prefix route.
1528 */
1529
1530static void
1531addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1532 unsigned long expires, u32 flags)
1da177e4 1533{
86872cb5
TG		 1534 struct fib6_config cfg = {
1535 .fc_table = RT6_TABLE_PREFIX,
1536 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1537 .fc_ifindex = dev->ifindex,
1538 .fc_expires = expires,
1539 .fc_dst_len = plen,
1540 .fc_flags = RTF_UP | flags,
1541 };
1da177e4 1542
86872cb5 1543 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1544
1545 /* Prevent useless cloning on PtP SIT.
1546 This thing is done here expecting that the whole
1547 class of non-broadcast devices need not cloning.
1548 */
0be669bb 1549#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1550 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1551 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1552#endif
1da177e4 1553
86872cb5 1554 ip6_route_add(&cfg);
1da177e4
LT		 1555}
1556
1557/* Create "default" multicast route to the interface */
1558
1559static void addrconf_add_mroute(struct net_device *dev)
1560{
86872cb5
TG		 1561 struct fib6_config cfg = {
1562 .fc_table = RT6_TABLE_LOCAL,
1563 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1564 .fc_ifindex = dev->ifindex,
1565 .fc_dst_len = 8,
1566 .fc_flags = RTF_UP,
1567 };
1568
1569 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1570
1571 ip6_route_add(&cfg);
1da177e4
LT		 1572}
1573
0be669bb 1574#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1575static void sit_route_add(struct net_device *dev)
1576{
86872cb5
TG		 1577 struct fib6_config cfg = {
1578 .fc_table = RT6_TABLE_MAIN,
1579 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1580 .fc_ifindex = dev->ifindex,
1581 .fc_dst_len = 96,
1582 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1583 };
1da177e4
LT		 1584
1585 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1586 ip6_route_add(&cfg);
1da177e4 1587}
0be669bb 1588#endif
1da177e4
LT		 1589
1590static void addrconf_add_lroute(struct net_device *dev)
1591{
1592 struct in6_addr addr;
1593
1594 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1595 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1596}
1597
1598static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1599{
1600 struct inet6_dev *idev;
1601
1602 ASSERT_RTNL();
1603
1604 if ((idev = ipv6_find_idev(dev)) == NULL)
1605 return NULL;
1606
1607 /* Add default multicast route */
1608 addrconf_add_mroute(dev);
1609
1610 /* Add link local route */
1611 addrconf_add_lroute(dev);
1612 return idev;
1613}
1614
1615void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1616{
1617 struct prefix_info *pinfo;
1618 __u32 valid_lft;
1619 __u32 prefered_lft;
1620 int addr_type;
1621 unsigned long rt_expires;
1622 struct inet6_dev *in6_dev;
1623
1624 pinfo = (struct prefix_info *) opt;
1ab1457c 1625
1da177e4
LT		 1626 if (len < sizeof(struct prefix_info)) {
1627 ADBG(("addrconf: prefix option too short\n"));
1628 return;
1629 }
1ab1457c 1630
1da177e4
LT		 1631 /*
1632 * Validation checks ([ADDRCONF], page 19)
1633 */
1634
1635 addr_type = ipv6_addr_type(&pinfo->prefix);
1636
1637 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1638 return;
1639
1640 valid_lft = ntohl(pinfo->valid);
1641 prefered_lft = ntohl(pinfo->prefered);
1642
1643 if (prefered_lft > valid_lft) {
1644 if (net_ratelimit())
1645 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1646 return;
1647 }
1648
1649 in6_dev = in6_dev_get(dev);
1650
1651 if (in6_dev == NULL) {
1652 if (net_ratelimit())
1653 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1654 return;
1655 }
1656
1657 /*
1658 * Two things going on here:
1659 * 1) Add routes for on-link prefixes
1660 * 2) Configure prefixes with the auto flag set
1661 */
1662
1663 /* Avoid arithmetic overflow. Really, we could
1664 save rt_expires in seconds, likely valid_lft,
1665 but it would require division in fib gc, that it
1666 not good.
1667 */
1668 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1669 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1670 else
3dd4bc68
YH		 1671 rt_expires = valid_lft * HZ;
1672
1673 /*
1674 * We convert this (in jiffies) to clock_t later.
1675 * Avoid arithmetic overflow there as well.
1676 * Overflow can happen only if HZ < USER_HZ.
1677 */
1678 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1679 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1680
1681 if (pinfo->onlink) {
1682 struct rt6_info *rt;
1683 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1684
1685 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1686 if (rt->rt6i_flags&RTF_EXPIRES) {
1687 if (valid_lft == 0) {
e0a1ad73 1688 ip6_del_rt(rt);
1da177e4
LT		 1689 rt = NULL;
1690 } else {
3dd4bc68 1691 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1692 }
1693 }
1694 } else if (valid_lft) {
1695 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1696 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1697 }
1698 if (rt)
1699 dst_release(&rt->u.dst);
1700 }
1701
1702 /* Try to figure out our local address for this prefix */
1703
1704 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1705 struct inet6_ifaddr * ifp;
1706 struct in6_addr addr;
1707 int create = 0, update_lft = 0;
1708
1709 if (pinfo->prefix_len == 64) {
1710 memcpy(&addr, &pinfo->prefix, 8);
1711 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1712 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1713 in6_dev_put(in6_dev);
1714 return;
1715 }
1716 goto ok;
1717 }
1718 if (net_ratelimit())
1719 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1720 pinfo->prefix_len);
1721 in6_dev_put(in6_dev);
1722 return;
1723
1724ok:
1725
1726 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1727
1728 if (ifp == NULL && valid_lft) {
1729 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1730 u32 addr_flags = 0;
1731
1732#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1733 if (in6_dev->cnf.optimistic_dad &&
1734 !ipv6_devconf.forwarding)
1735 addr_flags = IFA_F_OPTIMISTIC;
1736#endif
1da177e4
LT		 1737
1738 /* Do not allow to create too much of autoconfigured
1739 * addresses; this would be too easy way to crash kernel.
1740 */
1741 if (!max_addresses ||
1742 ipv6_count_addresses(in6_dev) < max_addresses)
1743 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1744 addr_type&IPV6_ADDR_SCOPE_MASK,
1745 addr_flags);
1da177e4
LT		 1746
1747 if (!ifp || IS_ERR(ifp)) {
1748 in6_dev_put(in6_dev);
1749 return;
1750 }
1751
1752 update_lft = create = 1;
1753 ifp->cstamp = jiffies;
1754 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1755 }
1756
1757 if (ifp) {
1758 int flags;
1759 unsigned long now;
1760#ifdef CONFIG_IPV6_PRIVACY
1761 struct inet6_ifaddr *ift;
1762#endif
1763 u32 stored_lft;
1764
1765 /* update lifetime (RFC2462 5.5.3 e) */
1766 spin_lock(&ifp->lock);
1767 now = jiffies;
1768 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1769 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1770 else
1771 stored_lft = 0;
1772 if (!update_lft && stored_lft) {
1773 if (valid_lft > MIN_VALID_LIFETIME ||
1774 valid_lft > stored_lft)
1775 update_lft = 1;
1776 else if (stored_lft <= MIN_VALID_LIFETIME) {
1777 /* valid_lft <= stored_lft is always true */
1778 /* XXX: IPsec */
1779 update_lft = 0;
1780 } else {
1781 valid_lft = MIN_VALID_LIFETIME;
1782 if (valid_lft < prefered_lft)
1783 prefered_lft = valid_lft;
1784 update_lft = 1;
1785 }
1786 }
1787
1788 if (update_lft) {
1789 ifp->valid_lft = valid_lft;
1790 ifp->prefered_lft = prefered_lft;
1791 ifp->tstamp = now;
1792 flags = ifp->flags;
1793 ifp->flags &= ~IFA_F_DEPRECATED;
1794 spin_unlock(&ifp->lock);
1795
1796 if (!(flags&IFA_F_TENTATIVE))
1797 ipv6_ifa_notify(0, ifp);
1798 } else
1799 spin_unlock(&ifp->lock);
1800
1801#ifdef CONFIG_IPV6_PRIVACY
1802 read_lock_bh(&in6_dev->lock);
1803 /* update all temporary addresses in the list */
1804 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1805 /*
1806 * When adjusting the lifetimes of an existing
1807 * temporary address, only lower the lifetimes.
1808 * Implementations must not increase the
1809 * lifetimes of an existing temporary address
1810 * when processing a Prefix Information Option.
1811 */
1812 spin_lock(&ift->lock);
1813 flags = ift->flags;
1814 if (ift->valid_lft > valid_lft &&
1815 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1816 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1817 if (ift->prefered_lft > prefered_lft &&
1818 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1819 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1820 spin_unlock(&ift->lock);
1821 if (!(flags&IFA_F_TENTATIVE))
1822 ipv6_ifa_notify(0, ift);
1823 }
1824
1825 if (create && in6_dev->cnf.use_tempaddr > 0) {
1826 /*
1827 * When a new public address is created as described in [ADDRCONF],
1828 * also create a new temporary address.
1829 */
1ab1457c 1830 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1831 ipv6_create_tempaddr(ifp, NULL);
1832 } else {
1833 read_unlock_bh(&in6_dev->lock);
1834 }
1835#endif
1836 in6_ifa_put(ifp);
1837 addrconf_verify(0);
1838 }
1839 }
1840 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1841 in6_dev_put(in6_dev);
1842}
1843
1844/*
1845 * Set destination address.
1846 * Special case for SIT interfaces where we create a new "virtual"
1847 * device.
1848 */
1849int addrconf_set_dstaddr(void __user *arg)
1850{
1851 struct in6_ifreq ireq;
1852 struct net_device *dev;
1853 int err = -EINVAL;
1854
1855 rtnl_lock();
1856
1857 err = -EFAULT;
1858 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1859 goto err_exit;
1860
881d966b 1861 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1862
1863 err = -ENODEV;
1864 if (dev == NULL)
1865 goto err_exit;
1866
0be669bb 1867#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1868 if (dev->type == ARPHRD_SIT) {
1869 struct ifreq ifr;
1870 mm_segment_t oldfs;
1871 struct ip_tunnel_parm p;
1872
1873 err = -EADDRNOTAVAIL;
1874 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1875 goto err_exit;
1876
1877 memset(&p, 0, sizeof(p));
1878 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1879 p.iph.saddr = 0;
1880 p.iph.version = 4;
1881 p.iph.ihl = 5;
1882 p.iph.protocol = IPPROTO_IPV6;
1883 p.iph.ttl = 64;
1884 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1885
1886 oldfs = get_fs(); set_fs(KERNEL_DS);
1887 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1888 set_fs(oldfs);
1889
1890 if (err == 0) {
1891 err = -ENOBUFS;
881d966b 1892 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1893 goto err_exit;
1894 err = dev_open(dev);
1895 }
1896 }
0be669bb 1897#endif
1da177e4
LT		 1898
1899err_exit:
1900 rtnl_unlock();
1901 return err;
1902}
1903
1904/*
1905 * Manual configuration of address on an interface
1906 */
0778769d 1907static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1908 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1909{
1910 struct inet6_ifaddr *ifp;
1911 struct inet6_dev *idev;
1912 struct net_device *dev;
1913 int scope;
46d48046 1914 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1915
1916 ASSERT_RTNL();
1ab1457c 1917
0778769d
NT		 1918 /* check the lifetime */
1919 if (!valid_lft || prefered_lft > valid_lft)
1920 return -EINVAL;
1921
881d966b 1922 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1923 return -ENODEV;
1ab1457c 1924
1da177e4
LT		 1925 if ((idev = addrconf_add_dev(dev)) == NULL)
1926 return -ENOBUFS;
1927
1928 scope = ipv6_addr_scope(pfx);
1929
46d48046 1930 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1931 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1932 flags = 0;
1933 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1934 valid_lft = 0x7FFFFFFF/HZ;
1935
1936 if (prefered_lft == 0)
1937 ifa_flags |= IFA_F_DEPRECATED;
1938 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1939 (prefered_lft != INFINITY_LIFE_TIME))
1940 prefered_lft = 0x7FFFFFFF/HZ;
1941
1942 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1943
1da177e4 1944 if (!IS_ERR(ifp)) {
06aebfb7 1945 spin_lock_bh(&ifp->lock);
0778769d
NT		 1946 ifp->valid_lft = valid_lft;
1947 ifp->prefered_lft = prefered_lft;
1948 ifp->tstamp = jiffies;
06aebfb7 1949 spin_unlock_bh(&ifp->lock);
0778769d 1950
46d48046
YH		 1951 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1952 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1953 /*
1954 * Note that section 3.1 of RFC 4429 indicates
1955 * that the Optimistic flag should not be set for
1956 * manually configured addresses
1957 */
1da177e4
LT		 1958 addrconf_dad_start(ifp, 0);
1959 in6_ifa_put(ifp);
0778769d 1960 addrconf_verify(0);
1da177e4
LT		 1961 return 0;
1962 }
1963
1964 return PTR_ERR(ifp);
1965}
1966
1967static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1968{
1969 struct inet6_ifaddr *ifp;
1970 struct inet6_dev *idev;
1971 struct net_device *dev;
1ab1457c 1972
881d966b 1973 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1974 return -ENODEV;
1975
1976 if ((idev = __in6_dev_get(dev)) == NULL)
1977 return -ENXIO;
1978
1979 read_lock_bh(&idev->lock);
1980 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1981 if (ifp->prefix_len == plen &&
1982 ipv6_addr_equal(pfx, &ifp->addr)) {
1983 in6_ifa_hold(ifp);
1984 read_unlock_bh(&idev->lock);
1ab1457c 1985
1da177e4
LT		 1986 ipv6_del_addr(ifp);
1987
1988 /* If the last address is deleted administratively,
1989 disable IPv6 on this interface.
1990 */
1991 if (idev->addr_list == NULL)
1992 addrconf_ifdown(idev->dev, 1);
1993 return 0;
1994 }
1995 }
1996 read_unlock_bh(&idev->lock);
1997 return -EADDRNOTAVAIL;
1998}
1999
2000
2001int addrconf_add_ifaddr(void __user *arg)
2002{
2003 struct in6_ifreq ireq;
2004 int err;
1ab1457c 2005
1da177e4
LT		 2006 if (!capable(CAP_NET_ADMIN))
2007 return -EPERM;
1ab1457c 2008
1da177e4
LT		 2009 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2010 return -EFAULT;
2011
2012 rtnl_lock();
0778769d 2013 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2014 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2015 rtnl_unlock();
2016 return err;
2017}
2018
2019int addrconf_del_ifaddr(void __user *arg)
2020{
2021 struct in6_ifreq ireq;
2022 int err;
1ab1457c 2023
1da177e4
LT		 2024 if (!capable(CAP_NET_ADMIN))
2025 return -EPERM;
2026
2027 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2028 return -EFAULT;
2029
2030 rtnl_lock();
2031 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2032 rtnl_unlock();
2033 return err;
2034}
2035
0be669bb 2036#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2037static void sit_add_v4_addrs(struct inet6_dev *idev)
2038{
2039 struct inet6_ifaddr * ifp;
2040 struct in6_addr addr;
2041 struct net_device *dev;
2042 int scope;
2043
2044 ASSERT_RTNL();
2045
2046 memset(&addr, 0, sizeof(struct in6_addr));
2047 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2048
2049 if (idev->dev->flags&IFF_POINTOPOINT) {
2050 addr.s6_addr32[0] = htonl(0xfe800000);
2051 scope = IFA_LINK;
2052 } else {
2053 scope = IPV6_ADDR_COMPATv4;
2054 }
2055
2056 if (addr.s6_addr32[3]) {
2057 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2058 if (!IS_ERR(ifp)) {
2059 spin_lock_bh(&ifp->lock);
2060 ifp->flags &= ~IFA_F_TENTATIVE;
2061 spin_unlock_bh(&ifp->lock);
2062 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2063 in6_ifa_put(ifp);
2064 }
2065 return;
2066 }
2067
881d966b 2068 for_each_netdev(&init_net, dev) {
e5ed6399 2069 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2070 if (in_dev && (dev->flags & IFF_UP)) {
2071 struct in_ifaddr * ifa;
2072
2073 int flag = scope;
2074
2075 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2076 int plen;
2077
2078 addr.s6_addr32[3] = ifa->ifa_local;
2079
2080 if (ifa->ifa_scope == RT_SCOPE_LINK)
2081 continue;
2082 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2083 if (idev->dev->flags&IFF_POINTOPOINT)
2084 continue;
2085 flag |= IFA_HOST;
2086 }
2087 if (idev->dev->flags&IFF_POINTOPOINT)
2088 plen = 64;
2089 else
2090 plen = 96;
2091
2092 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2093 IFA_F_PERMANENT);
2094 if (!IS_ERR(ifp)) {
2095 spin_lock_bh(&ifp->lock);
2096 ifp->flags &= ~IFA_F_TENTATIVE;
2097 spin_unlock_bh(&ifp->lock);
2098 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2099 in6_ifa_put(ifp);
2100 }
2101 }
2102 }
1ab1457c 2103 }
1da177e4 2104}
0be669bb 2105#endif
1da177e4
LT		 2106
2107static void init_loopback(struct net_device *dev)
2108{
2109 struct inet6_dev *idev;
2110 struct inet6_ifaddr * ifp;
2111
2112 /* ::1 */
2113
2114 ASSERT_RTNL();
2115
2116 if ((idev = ipv6_find_idev(dev)) == NULL) {
2117 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2118 return;
2119 }
2120
2121 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2122 if (!IS_ERR(ifp)) {
2123 spin_lock_bh(&ifp->lock);
2124 ifp->flags &= ~IFA_F_TENTATIVE;
2125 spin_unlock_bh(&ifp->lock);
2126 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2127 in6_ifa_put(ifp);
2128 }
2129}
2130
2131static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2132{
2133 struct inet6_ifaddr * ifp;
95c385b4
NH		 2134 u32 addr_flags = IFA_F_PERMANENT;
2135
2136#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2137 if (idev->cnf.optimistic_dad &&
2138 !ipv6_devconf.forwarding)
2139 addr_flags |= IFA_F_OPTIMISTIC;
2140#endif
1da177e4 2141
95c385b4
NH		 2142
2143 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2144 if (!IS_ERR(ifp)) {
46d48046 2145 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2146 addrconf_dad_start(ifp, 0);
2147 in6_ifa_put(ifp);
2148 }
2149}
2150
2151static void addrconf_dev_config(struct net_device *dev)
2152{
2153 struct in6_addr addr;
2154 struct inet6_dev * idev;
2155
2156 ASSERT_RTNL();
2157
74235a25
HX		 2158 if ((dev->type != ARPHRD_ETHER) &&
2159 (dev->type != ARPHRD_FDDI) &&
2160 (dev->type != ARPHRD_IEEE802_TR) &&
2161 (dev->type != ARPHRD_ARCNET) &&
2162 (dev->type != ARPHRD_INFINIBAND)) {
2163 /* Alas, we support only Ethernet autoconfiguration. */
2164 return;
2165 }
2166
1da177e4
LT		 2167 idev = addrconf_add_dev(dev);
2168 if (idev == NULL)
2169 return;
2170
2171 memset(&addr, 0, sizeof(struct in6_addr));
2172 addr.s6_addr32[0] = htonl(0xFE800000);
2173
2174 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2175 addrconf_add_linklocal(idev, &addr);
2176}
2177
0be669bb 2178#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2179static void addrconf_sit_config(struct net_device *dev)
2180{
2181 struct inet6_dev *idev;
2182
2183 ASSERT_RTNL();
2184
1ab1457c
YH		 2185 /*
2186 * Configure the tunnel with one of our IPv4
2187 * addresses... we should configure all of
1da177e4
LT		 2188 * our v4 addrs in the tunnel
2189 */
2190
2191 if ((idev = ipv6_find_idev(dev)) == NULL) {
2192 printk(KERN_DEBUG "init sit: add_dev failed\n");
2193 return;
2194 }
2195
2196 sit_add_v4_addrs(idev);
2197
2198 if (dev->flags&IFF_POINTOPOINT) {
2199 addrconf_add_mroute(dev);
2200 addrconf_add_lroute(dev);
2201 } else
2202 sit_route_add(dev);
2203}
0be669bb 2204#endif
1da177e4
LT		 2205
2206static inline int
2207ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2208{
2209 struct in6_addr lladdr;
2210
95c385b4 2211 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2212 addrconf_add_linklocal(idev, &lladdr);
2213 return 0;
2214 }
2215 return -1;
2216}
2217
2218static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2219{
2220 struct net_device *link_dev;
2221
2222 /* first try to inherit the link-local address from the link device */
2223 if (idev->dev->iflink &&
881d966b 2224 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2225 if (!ipv6_inherit_linklocal(idev, link_dev))
2226 return;
2227 }
2228 /* then try to inherit it from any device */
881d966b 2229 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2230 if (!ipv6_inherit_linklocal(idev, link_dev))
2231 return;
2232 }
2233 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2234}
2235
2236/*
2237 * Autoconfigure tunnel with a link-local address so routing protocols,
2238 * DHCPv6, MLD etc. can be run over the virtual link
2239 */
2240
2241static void addrconf_ip6_tnl_config(struct net_device *dev)
2242{
2243 struct inet6_dev *idev;
2244
2245 ASSERT_RTNL();
2246
2247 if ((idev = addrconf_add_dev(dev)) == NULL) {
2248 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2249 return;
2250 }
2251 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2252}
2253
1ab1457c 2254static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2255 void * data)
2256{
2257 struct net_device *dev = (struct net_device *) data;
74235a25 2258 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2259 int run_pending = 0;
b217d616 2260 int err;
1da177e4 2261
e9dc8653
EB		 2262 if (dev->nd_net != &init_net)
2263 return NOTIFY_DONE;
2264
1da177e4 2265 switch(event) {
45ba9dd2 2266 case NETDEV_REGISTER:
74235a25 2267 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2268 idev = ipv6_add_dev(dev);
2269 if (!idev)
b217d616 2270 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2271 }
2272 break;
1da177e4 2273 case NETDEV_UP:
3c21edbd 2274 case NETDEV_CHANGE:
c2edacf8
JV		 2275 if (dev->flags & IFF_SLAVE)
2276 break;
2277
3c21edbd
YH		 2278 if (event == NETDEV_UP) {
2279 if (!netif_carrier_ok(dev)) {
2280 /* device is not ready yet. */
2281 printk(KERN_INFO
2282 "ADDRCONF(NETDEV_UP): %s: "
2283 "link is not ready\n",
2284 dev->name);
2285 break;
2286 }
99081049
KS		 2287
2288 if (idev)
2289 idev->if_flags |= IF_READY;
3c21edbd
YH		 2290 } else {
2291 if (!netif_carrier_ok(dev)) {
2292 /* device is still not ready. */
2293 break;
2294 }
2295
2296 if (idev) {
2297 if (idev->if_flags & IF_READY) {
2298 /* device is already configured. */
2299 break;
2300 }
2301 idev->if_flags |= IF_READY;
2302 }
2303
2304 printk(KERN_INFO
2305 "ADDRCONF(NETDEV_CHANGE): %s: "
2306 "link becomes ready\n",
2307 dev->name);
2308
c5e33bdd 2309 run_pending = 1;
3c21edbd
YH		 2310 }
2311
1da177e4 2312 switch(dev->type) {
0be669bb 2313#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2314 case ARPHRD_SIT:
2315 addrconf_sit_config(dev);
2316 break;
0be669bb 2317#endif
1da177e4
LT		 2318 case ARPHRD_TUNNEL6:
2319 addrconf_ip6_tnl_config(dev);
2320 break;
2321 case ARPHRD_LOOPBACK:
2322 init_loopback(dev);
2323 break;
2324
2325 default:
2326 addrconf_dev_config(dev);
2327 break;
3ff50b79 2328 }
1da177e4 2329 if (idev) {
c5e33bdd
YH		 2330 if (run_pending)
2331 addrconf_dad_run(idev);
2332
1da177e4
LT		 2333 /* If the MTU changed during the interface down, when the
2334 interface up, the changed MTU must be reflected in the
2335 idev as well as routers.
2336 */
2337 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2338 rt6_mtu_change(dev, dev->mtu);
2339 idev->cnf.mtu6 = dev->mtu;
2340 }
2341 idev->tstamp = jiffies;
2342 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2343 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2344 stop IPv6 on this interface.
2345 */
2346 if (dev->mtu < IPV6_MIN_MTU)
2347 addrconf_ifdown(dev, event != NETDEV_DOWN);
2348 }
2349 break;
2350
2351 case NETDEV_CHANGEMTU:
2352 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2353 rt6_mtu_change(dev, dev->mtu);
2354 idev->cnf.mtu6 = dev->mtu;
2355 break;
2356 }
2357
2358 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2359
2360 case NETDEV_DOWN:
2361 case NETDEV_UNREGISTER:
2362 /*
2363 * Remove all addresses from this interface.
2364 */
2365 addrconf_ifdown(dev, event != NETDEV_DOWN);
2366 break;
3c21edbd 2367
1da177e4 2368 case NETDEV_CHANGENAME:
1da177e4 2369 if (idev) {
5632c515
SH		 2370 snmp6_unregister_dev(idev);
2371#ifdef CONFIG_SYSCTL
1da177e4
LT		 2372 addrconf_sysctl_unregister(&idev->cnf);
2373 neigh_sysctl_unregister(idev->nd_parms);
2374 neigh_sysctl_register(dev, idev->nd_parms,
2375 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2376 &ndisc_ifinfo_sysctl_change,
2377 NULL);
2378 addrconf_sysctl_register(idev, &idev->cnf);
1da177e4 2379#endif
b217d616
HX		 2380 err = snmp6_register_dev(idev);
2381 if (err)
2382 return notifier_from_errno(err);
5632c515 2383 }
1da177e4 2384 break;
3ff50b79 2385 }
1da177e4
LT		 2386
2387 return NOTIFY_OK;
2388}
2389
2390/*
2391 * addrconf module should be notified of a device going up
2392 */
2393static struct notifier_block ipv6_dev_notf = {
2394 .notifier_call = addrconf_notify,
2395 .priority = 0
2396};
2397
2398static int addrconf_ifdown(struct net_device *dev, int how)
2399{
2400 struct inet6_dev *idev;
2401 struct inet6_ifaddr *ifa, **bifa;
2402 int i;
2403
2404 ASSERT_RTNL();
2405
2406 if (dev == &loopback_dev && how == 1)
2407 how = 0;
2408
2409 rt6_ifdown(dev);
2410 neigh_ifdown(&nd_tbl, dev);
2411
2412 idev = __in6_dev_get(dev);
2413 if (idev == NULL)
2414 return -ENODEV;
2415
2416 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2417 Do not dev_put!
1da177e4
LT		 2418 */
2419 if (how == 1) {
1da177e4 2420 idev->dead = 1;
8814c4b5
YH		 2421
2422 /* protected by rtnl_lock */
2423 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2424
2425 /* Step 1.5: remove snmp6 entry */
2426 snmp6_unregister_dev(idev);
2427
2428 }
2429
2430 /* Step 2: clear hash table */
2431 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2432 bifa = &inet6_addr_lst[i];
2433
2434 write_lock_bh(&addrconf_hash_lock);
2435 while ((ifa = *bifa) != NULL) {
2436 if (ifa->idev == idev) {
2437 *bifa = ifa->lst_next;
2438 ifa->lst_next = NULL;
2439 addrconf_del_timer(ifa);
2440 in6_ifa_put(ifa);
2441 continue;
2442 }
2443 bifa = &ifa->lst_next;
2444 }
2445 write_unlock_bh(&addrconf_hash_lock);
2446 }
2447
2448 write_lock_bh(&idev->lock);
2449
2450 /* Step 3: clear flags for stateless addrconf */
2451 if (how != 1)
3c21edbd 2452 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2453
2454 /* Step 4: clear address list */
2455#ifdef CONFIG_IPV6_PRIVACY
2456 if (how == 1 && del_timer(&idev->regen_timer))
2457 in6_dev_put(idev);
2458
2459 /* clear tempaddr list */
2460 while ((ifa = idev->tempaddr_list) != NULL) {
2461 idev->tempaddr_list = ifa->tmp_next;
2462 ifa->tmp_next = NULL;
2463 ifa->dead = 1;
2464 write_unlock_bh(&idev->lock);
2465 spin_lock_bh(&ifa->lock);
2466
2467 if (ifa->ifpub) {
2468 in6_ifa_put(ifa->ifpub);
2469 ifa->ifpub = NULL;
2470 }
2471 spin_unlock_bh(&ifa->lock);
2472 in6_ifa_put(ifa);
2473 write_lock_bh(&idev->lock);
2474 }
2475#endif
2476 while ((ifa = idev->addr_list) != NULL) {
2477 idev->addr_list = ifa->if_next;
2478 ifa->if_next = NULL;
2479 ifa->dead = 1;
2480 addrconf_del_timer(ifa);
2481 write_unlock_bh(&idev->lock);
2482
2483 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2484 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2485 in6_ifa_put(ifa);
2486
2487 write_lock_bh(&idev->lock);
2488 }
2489 write_unlock_bh(&idev->lock);
2490
2491 /* Step 5: Discard multicast list */
2492
2493 if (how == 1)
2494 ipv6_mc_destroy_dev(idev);
2495 else
2496 ipv6_mc_down(idev);
2497
1da177e4 2498 idev->tstamp = jiffies;
1ab1457c 2499
1da177e4
LT		 2500 /* Shot the device (if unregistered) */
2501
2502 if (how == 1) {
2503#ifdef CONFIG_SYSCTL
2504 addrconf_sysctl_unregister(&idev->cnf);
2505 neigh_sysctl_unregister(idev->nd_parms);
2506#endif
2507 neigh_parms_release(&nd_tbl, idev->nd_parms);
2508 neigh_ifdown(&nd_tbl, dev);
2509 in6_dev_put(idev);
2510 }
2511 return 0;
2512}
2513
2514static void addrconf_rs_timer(unsigned long data)
2515{
2516 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2517
2518 if (ifp->idev->cnf.forwarding)
2519 goto out;
2520
2521 if (ifp->idev->if_flags & IF_RA_RCVD) {
2522 /*
2523 * Announcement received after solicitation
2524 * was sent
2525 */
2526 goto out;
2527 }
2528
2529 spin_lock(&ifp->lock);
2530 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2531 struct in6_addr all_routers;
2532
2533 /* The wait after the last probe can be shorter */
2534 addrconf_mod_timer(ifp, AC_RS,
2535 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2536 ifp->idev->cnf.rtr_solicit_delay :
2537 ifp->idev->cnf.rtr_solicit_interval);
2538 spin_unlock(&ifp->lock);
2539
2540 ipv6_addr_all_routers(&all_routers);
2541
2542 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2543 } else {
2544 spin_unlock(&ifp->lock);
2545 /*
2546 * Note: we do not support deprecated "all on-link"
2547 * assumption any longer.
2548 */
2549 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2550 ifp->idev->dev->name);
2551 }
2552
2553out:
2554 in6_ifa_put(ifp);
2555}
2556
2557/*
2558 * Duplicate Address Detection
2559 */
3c21edbd
YH		 2560static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2561{
2562 unsigned long rand_num;
2563 struct inet6_dev *idev = ifp->idev;
2564
95c385b4
NH		 2565 if (ifp->flags & IFA_F_OPTIMISTIC)
2566 rand_num = 0;
2567 else
2568 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2569
3c21edbd
YH		 2570 ifp->probes = idev->cnf.dad_transmits;
2571 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2572}
2573
e431b8c0 2574static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2575{
2576 struct inet6_dev *idev = ifp->idev;
2577 struct net_device *dev = idev->dev;
1da177e4
LT		 2578
2579 addrconf_join_solict(dev, &ifp->addr);
2580
1da177e4 2581 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2582
2583 read_lock_bh(&idev->lock);
2584 if (ifp->dead)
2585 goto out;
2586 spin_lock_bh(&ifp->lock);
2587
2588 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2589 !(ifp->flags&IFA_F_TENTATIVE) ||
2590 ifp->flags & IFA_F_NODAD) {
95c385b4 2591 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2592 spin_unlock_bh(&ifp->lock);
2593 read_unlock_bh(&idev->lock);
2594
2595 addrconf_dad_completed(ifp);
2596 return;
2597 }
2598
6732bade 2599 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2600 spin_unlock_bh(&ifp->lock);
6732bade 2601 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2602 /*
2603 * If the defice is not ready:
2604 * - keep it tentative if it is a permanent address.
2605 * - otherwise, kill it.
2606 */
2607 in6_ifa_hold(ifp);
2608 addrconf_dad_stop(ifp);
6732bade 2609 return;
3c21edbd 2610 }
95c385b4
NH		 2611
2612 /*
2613 * Optimistic nodes can start receiving
2614 * Frames right away
2615 */
2616 if(ifp->flags & IFA_F_OPTIMISTIC)
2617 ip6_ins_rt(ifp->rt);
2618
6732bade
YH		 2619 addrconf_dad_kick(ifp);
2620 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2621out:
2622 read_unlock_bh(&idev->lock);
2623}
2624
2625static void addrconf_dad_timer(unsigned long data)
2626{
2627 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2628 struct inet6_dev *idev = ifp->idev;
2629 struct in6_addr unspec;
2630 struct in6_addr mcaddr;
2631
2632 read_lock_bh(&idev->lock);
2633 if (idev->dead) {
2634 read_unlock_bh(&idev->lock);
2635 goto out;
2636 }
2637 spin_lock_bh(&ifp->lock);
2638 if (ifp->probes == 0) {
2639 /*
2640 * DAD was successful
2641 */
2642
95c385b4 2643 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2644 spin_unlock_bh(&ifp->lock);
2645 read_unlock_bh(&idev->lock);
2646
2647 addrconf_dad_completed(ifp);
2648
2649 goto out;
2650 }
2651
2652 ifp->probes--;
2653 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2654 spin_unlock_bh(&ifp->lock);
2655 read_unlock_bh(&idev->lock);
2656
2657 /* send a neighbour solicitation for our addr */
2658 memset(&unspec, 0, sizeof(unspec));
2659 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2660 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2661out:
2662 in6_ifa_put(ifp);
2663}
2664
2665static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2666{
2667 struct net_device * dev = ifp->idev->dev;
2668
2669 /*
2670 * Configure the address for reception. Now it is valid.
2671 */
2672
2673 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2674
2675 /* If added prefix is link local and forwarding is off,
2676 start sending router solicitations.
2677 */
2678
2679 if (ifp->idev->cnf.forwarding == 0 &&
2680 ifp->idev->cnf.rtr_solicits > 0 &&
2681 (dev->flags&IFF_LOOPBACK) == 0 &&
2682 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2683 struct in6_addr all_routers;
2684
2685 ipv6_addr_all_routers(&all_routers);
2686
2687 /*
2688 * If a host as already performed a random delay
2689 * [...] as part of DAD [...] there is no need
2690 * to delay again before sending the first RS
2691 */
2692 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2693
2694 spin_lock_bh(&ifp->lock);
2695 ifp->probes = 1;
2696 ifp->idev->if_flags |= IF_RS_SENT;
2697 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2698 spin_unlock_bh(&ifp->lock);
2699 }
2700}
2701
c5e33bdd
YH		 2702static void addrconf_dad_run(struct inet6_dev *idev) {
2703 struct inet6_ifaddr *ifp;
2704
2705 read_lock_bh(&idev->lock);
2706 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2707 spin_lock_bh(&ifp->lock);
2708 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2709 spin_unlock_bh(&ifp->lock);
2710 continue;
2711 }
2712 spin_unlock_bh(&ifp->lock);
2713 addrconf_dad_kick(ifp);
2714 }
2715 read_unlock_bh(&idev->lock);
2716}
2717
1da177e4
LT		 2718#ifdef CONFIG_PROC_FS
2719struct if6_iter_state {
2720 int bucket;
2721};
2722
2723static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2724{
2725 struct inet6_ifaddr *ifa = NULL;
2726 struct if6_iter_state *state = seq->private;
2727
2728 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2729 ifa = inet6_addr_lst[state->bucket];
2730 if (ifa)
2731 break;
2732 }
2733 return ifa;
2734}
2735
2736static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2737{
2738 struct if6_iter_state *state = seq->private;
2739
2740 ifa = ifa->lst_next;
2741try_again:
2742 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2743 ifa = inet6_addr_lst[state->bucket];
2744 goto try_again;
2745 }
2746 return ifa;
2747}
2748
2749static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2750{
2751 struct inet6_ifaddr *ifa = if6_get_first(seq);
2752
2753 if (ifa)
2754 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2755 --pos;
2756 return pos ? NULL : ifa;
2757}
2758
2759static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2760{
2761 read_lock_bh(&addrconf_hash_lock);
2762 return if6_get_idx(seq, *pos);
2763}
2764
2765static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2766{
2767 struct inet6_ifaddr *ifa;
2768
2769 ifa = if6_get_next(seq, v);
2770 ++*pos;
2771 return ifa;
2772}
2773
2774static void if6_seq_stop(struct seq_file *seq, void *v)
2775{
2776 read_unlock_bh(&addrconf_hash_lock);
2777}
2778
2779static int if6_seq_show(struct seq_file *seq, void *v)
2780{
2781 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2782 seq_printf(seq,
9343e79a 2783 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2784 NIP6(ifp->addr),
2785 ifp->idev->dev->ifindex,
2786 ifp->prefix_len,
2787 ifp->scope,
2788 ifp->flags,
2789 ifp->idev->dev->name);
2790 return 0;
2791}
2792
56b3d975 2793static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2794 .start = if6_seq_start,
2795 .next = if6_seq_next,
2796 .show = if6_seq_show,
2797 .stop = if6_seq_stop,
2798};
2799
2800static int if6_seq_open(struct inode *inode, struct file *file)
2801{
2802 struct seq_file *seq;
2803 int rc = -ENOMEM;
322f74a4 2804 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2805
2806 if (!s)
2807 goto out;
1da177e4
LT		 2808
2809 rc = seq_open(file, &if6_seq_ops);
2810 if (rc)
2811 goto out_kfree;
2812
2813 seq = file->private_data;
2814 seq->private = s;
2815out:
2816 return rc;
2817out_kfree:
2818 kfree(s);
2819 goto out;
2820}
2821
9a32144e 2822static const struct file_operations if6_fops = {
1da177e4
LT		 2823 .owner = THIS_MODULE,
2824 .open = if6_seq_open,
2825 .read = seq_read,
2826 .llseek = seq_lseek,
2827 .release = seq_release_private,
2828};
2829
2830int __init if6_proc_init(void)
2831{
457c4cbc 2832 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2833 return -ENOMEM;
2834 return 0;
2835}
2836
2837void if6_proc_exit(void)
2838{
457c4cbc 2839 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2840}
2841#endif /* CONFIG_PROC_FS */
2842
59fbb3a6 2843#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2844/* Check if address is a home address configured on any interface. */
2845int ipv6_chk_home_addr(struct in6_addr *addr)
2846{
2847 int ret = 0;
2848 struct inet6_ifaddr * ifp;
2849 u8 hash = ipv6_addr_hash(addr);
2850 read_lock_bh(&addrconf_hash_lock);
2851 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2852 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2853 (ifp->flags & IFA_F_HOMEADDRESS)) {
2854 ret = 1;
2855 break;
2856 }
2857 }
2858 read_unlock_bh(&addrconf_hash_lock);
2859 return ret;
2860}
2861#endif
2862
1da177e4
LT		 2863/*
2864 * Periodic address status verification
2865 */
2866
2867static void addrconf_verify(unsigned long foo)
2868{
2869 struct inet6_ifaddr *ifp;
2870 unsigned long now, next;
2871 int i;
2872
2873 spin_lock_bh(&addrconf_verify_lock);
2874 now = jiffies;
2875 next = now + ADDR_CHECK_FREQUENCY;
2876
2877 del_timer(&addr_chk_timer);
2878
2879 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2880
2881restart:
5d5780df 2882 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2883 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2884 unsigned long age;
2885#ifdef CONFIG_IPV6_PRIVACY
2886 unsigned long regen_advance;
2887#endif
2888
2889 if (ifp->flags & IFA_F_PERMANENT)
2890 continue;
2891
2892 spin_lock(&ifp->lock);
2893 age = (now - ifp->tstamp) / HZ;
2894
2895#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2896 regen_advance = ifp->idev->cnf.regen_max_retry *
2897 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2898 ifp->idev->nd_parms->retrans_time / HZ;
2899#endif
2900
8f27ebb9
YH		 2901 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2902 age >= ifp->valid_lft) {
1da177e4
LT		 2903 spin_unlock(&ifp->lock);
2904 in6_ifa_hold(ifp);
5d5780df 2905 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2906 ipv6_del_addr(ifp);
2907 goto restart;
8f27ebb9
YH		 2908 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2909 spin_unlock(&ifp->lock);
2910 continue;
1da177e4
LT		 2911 } else if (age >= ifp->prefered_lft) {
2912 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2913 int deprecate = 0;
2914
2915 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2916 deprecate = 1;
2917 ifp->flags |= IFA_F_DEPRECATED;
2918 }
2919
2920 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2921 next = ifp->tstamp + ifp->valid_lft * HZ;
2922
2923 spin_unlock(&ifp->lock);
2924
2925 if (deprecate) {
2926 in6_ifa_hold(ifp);
5d5780df 2927 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2928
2929 ipv6_ifa_notify(0, ifp);
2930 in6_ifa_put(ifp);
2931 goto restart;
2932 }
2933#ifdef CONFIG_IPV6_PRIVACY
2934 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2935 !(ifp->flags&IFA_F_TENTATIVE)) {
2936 if (age >= ifp->prefered_lft - regen_advance) {
2937 struct inet6_ifaddr *ifpub = ifp->ifpub;
2938 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2939 next = ifp->tstamp + ifp->prefered_lft * HZ;
2940 if (!ifp->regen_count && ifpub) {
2941 ifp->regen_count++;
2942 in6_ifa_hold(ifp);
2943 in6_ifa_hold(ifpub);
2944 spin_unlock(&ifp->lock);
5d5780df 2945 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2946 spin_lock(&ifpub->lock);
2947 ifpub->regen_count = 0;
2948 spin_unlock(&ifpub->lock);
1da177e4
LT		 2949 ipv6_create_tempaddr(ifpub, ifp);
2950 in6_ifa_put(ifpub);
2951 in6_ifa_put(ifp);
2952 goto restart;
2953 }
2954 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2955 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2956 spin_unlock(&ifp->lock);
2957#endif
2958 } else {
2959 /* ifp->prefered_lft <= ifp->valid_lft */
2960 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2961 next = ifp->tstamp + ifp->prefered_lft * HZ;
2962 spin_unlock(&ifp->lock);
2963 }
2964 }
5d5780df 2965 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2966 }
2967
2968 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2969 add_timer(&addr_chk_timer);
2970 spin_unlock_bh(&addrconf_verify_lock);
2971}
2972
461d8837
TG		 2973static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2974{
2975 struct in6_addr *pfx = NULL;
2976
2977 if (addr)
2978 pfx = nla_data(addr);
2979
2980 if (local) {
2981 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2982 pfx = NULL;
2983 else
2984 pfx = nla_data(local);
2985 }
2986
2987 return pfx;
2988}
2989
ef7c79ed 2990static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2991 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2992 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2993 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2994};
2995
1da177e4
LT		 2996static int
2997inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2998{
b933f716
TG		 2999 struct ifaddrmsg *ifm;
3000 struct nlattr *tb[IFA_MAX+1];
1da177e4 3001 struct in6_addr *pfx;
b933f716 3002 int err;
1da177e4 3003
b933f716
TG		 3004 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3005 if (err < 0)
3006 return err;
3007
3008 ifm = nlmsg_data(nlh);
3009 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3010 if (pfx == NULL)
3011 return -EINVAL;
3012
3013 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3014}
3015
55ebaef1
NT		 3016static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3017 u32 prefered_lft, u32 valid_lft)
081bba5b 3018{
46d48046
YH		 3019 u32 flags = RTF_EXPIRES;
3020
081bba5b
NT		 3021 if (!valid_lft || (prefered_lft > valid_lft))
3022 return -EINVAL;
3023
46d48046 3024 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3025 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3026 flags = 0;
3027 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3028 valid_lft = 0x7FFFFFFF/HZ;
3029
3030 if (prefered_lft == 0)
55ebaef1 3031 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3032 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3033 (prefered_lft != INFINITY_LIFE_TIME))
3034 prefered_lft = 0x7FFFFFFF/HZ;
3035
3036 spin_lock_bh(&ifp->lock);
3b9f9a1c 3037 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3038 ifp->tstamp = jiffies;
3039 ifp->valid_lft = valid_lft;
3040 ifp->prefered_lft = prefered_lft;
3041
3042 spin_unlock_bh(&ifp->lock);
3043 if (!(ifp->flags&IFA_F_TENTATIVE))
3044 ipv6_ifa_notify(0, ifp);
081bba5b 3045
46d48046
YH		 3046 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3047 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3048 addrconf_verify(0);
3049
3050 return 0;
3051}
3052
1da177e4
LT		 3053static int
3054inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3055{
461d8837
TG		 3056 struct ifaddrmsg *ifm;
3057 struct nlattr *tb[IFA_MAX+1];
1da177e4 3058 struct in6_addr *pfx;
7198f8ce
TG		 3059 struct inet6_ifaddr *ifa;
3060 struct net_device *dev;
55ebaef1
NT		 3061 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3062 u8 ifa_flags;
461d8837 3063 int err;
1da177e4 3064
461d8837
TG		 3065 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3066 if (err < 0)
3067 return err;
3068
3069 ifm = nlmsg_data(nlh);
3070 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3071 if (pfx == NULL)
3072 return -EINVAL;
3073
461d8837 3074 if (tb[IFA_CACHEINFO]) {
0778769d 3075 struct ifa_cacheinfo *ci;
461d8837
TG		 3076
3077 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3078 valid_lft = ci->ifa_valid;
461d8837
TG		 3079 preferred_lft = ci->ifa_prefered;
3080 } else {
3081 preferred_lft = INFINITY_LIFE_TIME;
3082 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3083 }
3084
881d966b 3085 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3086 if (dev == NULL)
3087 return -ENODEV;
3088
55ebaef1 3089 /* We ignore other flags so far. */
3b9f9a1c 3090 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3091
7198f8ce
TG		 3092 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3093 if (ifa == NULL) {
3094 /*
3095 * It would be best to check for !NLM_F_CREATE here but
3096 * userspace alreay relies on not having to provide this.
3097 */
3098 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3099 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3100 }
3101
7198f8ce
TG		 3102 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3103 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3104 err = -EEXIST;
3105 else
55ebaef1 3106 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3107
3108 in6_ifa_put(ifa);
3109
3110 return err;
1da177e4
LT		 3111}
3112
101bb229
TG		 3113static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3114 u8 scope, int ifindex)
3115{
3116 struct ifaddrmsg *ifm;
3117
3118 ifm = nlmsg_data(nlh);
3119 ifm->ifa_family = AF_INET6;
3120 ifm->ifa_prefixlen = prefixlen;
3121 ifm->ifa_flags = flags;
3122 ifm->ifa_scope = scope;
3123 ifm->ifa_index = ifindex;
3124}
3125
85486af0
TG		 3126static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3127 unsigned long tstamp, u32 preferred, u32 valid)
3128{
3129 struct ifa_cacheinfo ci;
3130
3131 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3132 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3133 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3134 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3135 ci.ifa_prefered = preferred;
3136 ci.ifa_valid = valid;
3137
3138 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3139}
3140
101bb229
TG		 3141static inline int rt_scope(int ifa_scope)
3142{
3143 if (ifa_scope & IFA_HOST)
3144 return RT_SCOPE_HOST;
3145 else if (ifa_scope & IFA_LINK)
3146 return RT_SCOPE_LINK;
3147 else if (ifa_scope & IFA_SITE)
3148 return RT_SCOPE_SITE;
3149 else
3150 return RT_SCOPE_UNIVERSE;
3151}
3152
0ab6803b
TG		 3153static inline int inet6_ifaddr_msgsize(void)
3154{
339bf98f
TG		 3155 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3156 + nla_total_size(16) /* IFA_ADDRESS */
3157 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3158}
c5396a31 3159
1da177e4 3160static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3161 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3162{
1da177e4 3163 struct nlmsghdr *nlh;
85486af0 3164 u32 preferred, valid;
1da177e4 3165
0ab6803b
TG		 3166 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3167 if (nlh == NULL)
26932566 3168 return -EMSGSIZE;
0ab6803b 3169
101bb229
TG		 3170 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3171 ifa->idev->dev->ifindex);
3172
1da177e4 3173 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3174 preferred = ifa->prefered_lft;
3175 valid = ifa->valid_lft;
3176 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3177 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3178 preferred -= tval;
3179 if (valid != INFINITY_LIFE_TIME)
3180 valid -= tval;
1da177e4
LT		 3181 }
3182 } else {
85486af0
TG		 3183 preferred = INFINITY_LIFE_TIME;
3184 valid = INFINITY_LIFE_TIME;
3185 }
3186
0ab6803b 3187 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3188 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3189 nlmsg_cancel(skb, nlh);
3190 return -EMSGSIZE;
3191 }
1da177e4 3192
0ab6803b 3193 return nlmsg_end(skb, nlh);
1da177e4
LT		 3194}
3195
3196static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3197 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3198{
1da177e4 3199 struct nlmsghdr *nlh;
101bb229
TG		 3200 u8 scope = RT_SCOPE_UNIVERSE;
3201 int ifindex = ifmca->idev->dev->ifindex;
3202
3203 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3204 scope = RT_SCOPE_SITE;
1da177e4 3205
0ab6803b
TG		 3206 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3207 if (nlh == NULL)
26932566 3208 return -EMSGSIZE;
85486af0 3209
0ab6803b
TG		 3210 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3211 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3212 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3213 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3214 nlmsg_cancel(skb, nlh);
3215 return -EMSGSIZE;
3216 }
85486af0 3217
0ab6803b 3218 return nlmsg_end(skb, nlh);
1da177e4
LT		 3219}
3220
3221static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3222 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3223{
1da177e4 3224 struct nlmsghdr *nlh;
101bb229
TG		 3225 u8 scope = RT_SCOPE_UNIVERSE;
3226 int ifindex = ifaca->aca_idev->dev->ifindex;
3227
3228 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3229 scope = RT_SCOPE_SITE;
1da177e4 3230
0ab6803b
TG		 3231 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3232 if (nlh == NULL)
26932566 3233 return -EMSGSIZE;
85486af0 3234
0ab6803b
TG		 3235 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3236 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3237 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3238 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3239 nlmsg_cancel(skb, nlh);
3240 return -EMSGSIZE;
3241 }
1da177e4 3242
0ab6803b 3243 return nlmsg_end(skb, nlh);
1da177e4
LT		 3244}
3245
3246enum addr_type_t
3247{
3248 UNICAST_ADDR,
3249 MULTICAST_ADDR,
3250 ANYCAST_ADDR,
3251};
3252
3253static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3254 enum addr_type_t type)
3255{
3256 int idx, ip_idx;
3257 int s_idx, s_ip_idx;
3258 int err = 1;
3259 struct net_device *dev;
3260 struct inet6_dev *idev = NULL;
3261 struct inet6_ifaddr *ifa;
3262 struct ifmcaddr6 *ifmca;
3263 struct ifacaddr6 *ifaca;
3264
3265 s_idx = cb->args[0];
3266 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3267
7562f876 3268 idx = 0;
881d966b 3269 for_each_netdev(&init_net, dev) {
1da177e4 3270 if (idx < s_idx)
7562f876 3271 goto cont;
1da177e4
LT		 3272 if (idx > s_idx)
3273 s_ip_idx = 0;
3274 ip_idx = 0;
3275 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3276 goto cont;
1da177e4
LT		 3277 read_lock_bh(&idev->lock);
3278 switch (type) {
3279 case UNICAST_ADDR:
ae9cda5d 3280 /* unicast address incl. temp addr */
1da177e4
LT		 3281 for (ifa = idev->addr_list; ifa;
3282 ifa = ifa->if_next, ip_idx++) {
3283 if (ip_idx < s_ip_idx)
3284 continue;
1ab1457c
YH		 3285 if ((err = inet6_fill_ifaddr(skb, ifa,
3286 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3287 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3288 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3289 goto done;
3290 }
1da177e4
LT		 3291 break;
3292 case MULTICAST_ADDR:
3293 /* multicast address */
1ab1457c 3294 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3295 ifmca = ifmca->next, ip_idx++) {
3296 if (ip_idx < s_ip_idx)
3297 continue;
1ab1457c
YH		 3298 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3299 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3300 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3301 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3302 goto done;
3303 }
3304 break;
3305 case ANYCAST_ADDR:
3306 /* anycast address */
3307 for (ifaca = idev->ac_list; ifaca;
3308 ifaca = ifaca->aca_next, ip_idx++) {
3309 if (ip_idx < s_ip_idx)
3310 continue;
1ab1457c
YH		 3311 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3312 NETLINK_CB(cb->skb).pid,
b6544c0b 3313 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3314 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3315 goto done;
3316 }
3317 break;
3318 default:
3319 break;
3320 }
3321 read_unlock_bh(&idev->lock);
3322 in6_dev_put(idev);
7562f876
PE		 3323cont:
3324 idx++;
1da177e4
LT		 3325 }
3326done:
3327 if (err <= 0) {
3328 read_unlock_bh(&idev->lock);
3329 in6_dev_put(idev);
3330 }
1da177e4
LT		 3331 cb->args[0] = idx;
3332 cb->args[1] = ip_idx;
3333 return skb->len;
3334}
3335
3336static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3337{
3338 enum addr_type_t type = UNICAST_ADDR;
3339 return inet6_dump_addr(skb, cb, type);
3340}
3341
3342static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3343{
3344 enum addr_type_t type = MULTICAST_ADDR;
3345 return inet6_dump_addr(skb, cb, type);
3346}
3347
3348
3349static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3350{
3351 enum addr_type_t type = ANYCAST_ADDR;
3352 return inet6_dump_addr(skb, cb, type);
3353}
3354
1b29fc2c
TG		 3355static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3356 void *arg)
6c223828 3357{
1b29fc2c
TG		 3358 struct ifaddrmsg *ifm;
3359 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3360 struct in6_addr *addr = NULL;
3361 struct net_device *dev = NULL;
3362 struct inet6_ifaddr *ifa;
3363 struct sk_buff *skb;
6c223828
NT		 3364 int err;
3365
1b29fc2c
TG		 3366 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3367 if (err < 0)
3368 goto errout;
3369
3370 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3371 if (addr == NULL) {
3372 err = -EINVAL;
3373 goto errout;
6c223828 3374 }
6c223828 3375
1b29fc2c 3376 ifm = nlmsg_data(nlh);
6c223828 3377 if (ifm->ifa_index)
881d966b 3378 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3379
1b29fc2c
TG		 3380 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3381 err = -EADDRNOTAVAIL;
3382 goto errout;
3383 }
6c223828 3384
0ab6803b 3385 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3386 err = -ENOBUFS;
1b29fc2c 3387 goto errout_ifa;
6c223828
NT		 3388 }
3389
6c223828
NT		 3390 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3391 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3392 if (err < 0) {
3393 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3394 WARN_ON(err == -EMSGSIZE);
3395 kfree_skb(skb);
3396 goto errout_ifa;
3397 }
2942e900 3398 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3399errout_ifa:
6c223828 3400 in6_ifa_put(ifa);
1b29fc2c 3401errout:
6c223828 3402 return err;
6c223828
NT		 3403}
3404
1da177e4
LT		 3405static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3406{
3407 struct sk_buff *skb;
5d620266 3408 int err = -ENOBUFS;
1da177e4 3409
0ab6803b 3410 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3411 if (skb == NULL)
3412 goto errout;
3413
3414 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3415 if (err < 0) {
3416 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3417 WARN_ON(err == -EMSGSIZE);
3418 kfree_skb(skb);
3419 goto errout;
3420 }
5d620266
TG		 3421 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3422errout:
3423 if (err < 0)
3424 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3425}
3426
b6f99a21 3427static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3428 __s32 *array, int bytes)
3429{
04561c1f
TG		 3430 BUG_ON(bytes < (DEVCONF_MAX * 4));
3431
1da177e4
LT		 3432 memset(array, 0, bytes);
3433 array[DEVCONF_FORWARDING] = cnf->forwarding;
3434 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3435 array[DEVCONF_MTU6] = cnf->mtu6;
3436 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3437 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3438 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3439 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3440 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3441 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3442 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3443 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3444#ifdef CONFIG_IPV6_PRIVACY
3445 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3446 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3447 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3448 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3449 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3450#endif
3451 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3452 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3453 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3454#ifdef CONFIG_IPV6_ROUTER_PREF
3455 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3456 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3457#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3458 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3459#endif
930d6ff2 3460#endif
fbea49e1 3461 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3462 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3463#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3464 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3465#endif
1da177e4
LT		 3466}
3467
339bf98f
TG		 3468static inline size_t inet6_if_nlmsg_size(void)
3469{
3470 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3471 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3472 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3473 + nla_total_size(4) /* IFLA_MTU */
3474 + nla_total_size(4) /* IFLA_LINK */
3475 + nla_total_size( /* IFLA_PROTINFO */
3476 nla_total_size(4) /* IFLA_INET6_FLAGS */
3477 + nla_total_size(sizeof(struct ifla_cacheinfo))
3478 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3479 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3480 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3481 );
3482}
c5396a31 3483
7f7d9a6b
HX		 3484static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3485 int bytes)
3486{
3487 int i;
3488 int pad = bytes - sizeof(u64) * items;
3489 BUG_ON(pad < 0);
3490
3491 /* Use put_unaligned() because stats may not be aligned for u64. */
3492 put_unaligned(items, &stats[0]);
3493 for (i = 1; i < items; i++)
3494 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3495
3496 memset(&stats[items], 0, pad);
3497}
3498
3499static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3500 int bytes)
3501{
3502 switch(attrtype) {
3503 case IFLA_INET6_STATS:
3504 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3505 break;
3506 case IFLA_INET6_ICMP6STATS:
3507 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3508 break;
3509 }
3510}
3511
1ab1457c 3512static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3513 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3514{
04561c1f 3515 struct net_device *dev = idev->dev;
bf99f1bd 3516 struct nlattr *nla;
04561c1f
TG		 3517 struct ifinfomsg *hdr;
3518 struct nlmsghdr *nlh;
3519 void *protoinfo;
3520 struct ifla_cacheinfo ci;
3521
3522 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3523 if (nlh == NULL)
26932566 3524 return -EMSGSIZE;
04561c1f
TG		 3525
3526 hdr = nlmsg_data(nlh);
3527 hdr->ifi_family = AF_INET6;
3528 hdr->__ifi_pad = 0;
3529 hdr->ifi_type = dev->type;
3530 hdr->ifi_index = dev->ifindex;
3531 hdr->ifi_flags = dev_get_flags(dev);
3532 hdr->ifi_change = 0;
3533
3534 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3535
3536 if (dev->addr_len)
04561c1f 3537 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3538
04561c1f 3539 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3540 if (dev->ifindex != dev->iflink)
04561c1f 3541 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3542
04561c1f
TG		 3543 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3544 if (protoinfo == NULL)
3545 goto nla_put_failure;
1da177e4 3546
04561c1f 3547 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3548
1da177e4
LT		 3549 ci.max_reasm_len = IPV6_MAXPLEN;
3550 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3551 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3552 ci.reachable_time = idev->nd_parms->reachable_time;
3553 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3554 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3555
bf99f1bd
YH		 3556 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3557 if (nla == NULL)
04561c1f 3558 goto nla_put_failure;
bf99f1bd 3559 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3560
bf99f1bd
YH		 3561 /* XXX - MC not implemented */
3562
3563 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3564 if (nla == NULL)
3565 goto nla_put_failure;
3566 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3567
3568 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3569 if (nla == NULL)
3570 goto nla_put_failure;
3571 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3572
04561c1f
TG		 3573 nla_nest_end(skb, protoinfo);
3574 return nlmsg_end(skb, nlh);
1da177e4 3575
04561c1f 3576nla_put_failure:
26932566
PM		 3577 nlmsg_cancel(skb, nlh);
3578 return -EMSGSIZE;
1da177e4
LT		 3579}
3580
3581static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3582{
3583 int idx, err;
3584 int s_idx = cb->args[0];
3585 struct net_device *dev;
3586 struct inet6_dev *idev;
3587
3588 read_lock(&dev_base_lock);
7562f876 3589 idx = 0;
881d966b 3590 for_each_netdev(&init_net, dev) {
1da177e4 3591 if (idx < s_idx)
7562f876 3592 goto cont;
1da177e4 3593 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3594 goto cont;
1ab1457c 3595 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3596 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3597 in6_dev_put(idev);
3598 if (err <= 0)
3599 break;
7562f876
PE		 3600cont:
3601 idx++;
1da177e4
LT		 3602 }
3603 read_unlock(&dev_base_lock);
3604 cb->args[0] = idx;
3605
3606 return skb->len;
3607}
3608
3609void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3610{
3611 struct sk_buff *skb;
8d7a76c9 3612 int err = -ENOBUFS;
1ab1457c 3613
339bf98f 3614 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3615 if (skb == NULL)
3616 goto errout;
3617
3618 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3619 if (err < 0) {
3620 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3621 WARN_ON(err == -EMSGSIZE);
3622 kfree_skb(skb);
3623 goto errout;
3624 }
8d7a76c9
TG		 3625 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3626errout:
3627 if (err < 0)
3628 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3629}
3630
339bf98f
TG		 3631static inline size_t inet6_prefix_nlmsg_size(void)
3632{
3633 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3634 + nla_total_size(sizeof(struct in6_addr))
3635 + nla_total_size(sizeof(struct prefix_cacheinfo));
3636}
c5396a31 3637
1da177e4 3638static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3639 struct prefix_info *pinfo, u32 pid, u32 seq,
3640 int event, unsigned int flags)
1da177e4 3641{
6051e2f4
TG		 3642 struct prefixmsg *pmsg;
3643 struct nlmsghdr *nlh;
1da177e4
LT		 3644 struct prefix_cacheinfo ci;
3645
6051e2f4
TG		 3646 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3647 if (nlh == NULL)
26932566 3648 return -EMSGSIZE;
6051e2f4
TG		 3649
3650 pmsg = nlmsg_data(nlh);
1da177e4 3651 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3652 pmsg->prefix_pad1 = 0;
3653 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3654 pmsg->prefix_ifindex = idev->dev->ifindex;
3655 pmsg->prefix_len = pinfo->prefix_len;
3656 pmsg->prefix_type = pinfo->type;
8a47077a 3657 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3658 pmsg->prefix_flags = 0;
3659 if (pinfo->onlink)
3660 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3661 if (pinfo->autoconf)
3662 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3663
6051e2f4 3664 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3665
3666 ci.preferred_time = ntohl(pinfo->prefered);
3667 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3668 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3669
6051e2f4 3670 return nlmsg_end(skb, nlh);
1da177e4 3671
6051e2f4 3672nla_put_failure:
26932566
PM		 3673 nlmsg_cancel(skb, nlh);
3674 return -EMSGSIZE;
1da177e4
LT		 3675}
3676
1ab1457c 3677static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3678 struct prefix_info *pinfo)
3679{
3680 struct sk_buff *skb;
8c384bfa 3681 int err = -ENOBUFS;
1da177e4 3682
339bf98f 3683 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3684 if (skb == NULL)
3685 goto errout;
3686
3687 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3688 if (err < 0) {
3689 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3690 WARN_ON(err == -EMSGSIZE);
3691 kfree_skb(skb);
3692 goto errout;
3693 }
8c384bfa
TG		 3694 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3695errout:
3696 if (err < 0)
3697 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3698}
3699
1da177e4
LT		 3700static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3701{
3702 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3703
3704 switch (event) {
3705 case RTM_NEWADDR:
95c385b4
NH		 3706 /*
3707 * If the address was optimistic
3708 * we inserted the route at the start of
3709 * our DAD process, so we don't need
3710 * to do it again
3711 */
3712 if (!(ifp->rt->rt6i_node))
3713 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3714 if (ifp->idev->cnf.forwarding)
3715 addrconf_join_anycast(ifp);
3716 break;
3717 case RTM_DELADDR:
3718 if (ifp->idev->cnf.forwarding)
3719 addrconf_leave_anycast(ifp);
3720 addrconf_leave_solict(ifp->idev, &ifp->addr);
3721 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3722 if (ip6_del_rt(ifp->rt))
1da177e4 3723 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3724 break;
3725 }
3726}
3727
3728static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3729{
8814c4b5 3730 rcu_read_lock_bh();
1da177e4
LT		 3731 if (likely(ifp->idev->dead == 0))
3732 __ipv6_ifa_notify(event, ifp);
8814c4b5 3733 rcu_read_unlock_bh();
1da177e4
LT		 3734}
3735
3736#ifdef CONFIG_SYSCTL
3737
3738static
3739int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3740 void __user *buffer, size_t *lenp, loff_t *ppos)
3741{
3742 int *valp = ctl->data;
3743 int val = *valp;
3744 int ret;
3745
3746 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3747
3748 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3749 if (valp != &ipv6_devconf.forwarding) {
3750 if ((!*valp) ^ (!val)) {
3751 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3752 if (idev == NULL)
3753 return ret;
3754 dev_forward_change(idev);
3755 }
3756 } else {
3757 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3758 addrconf_forward_change();
3759 }
3760 if (*valp)
3761 rt6_purge_dflt_routers();
3762 }
3763
1ab1457c 3764 return ret;
1da177e4
LT		 3765}
3766
1ab1457c 3767static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3768 int __user *name, int nlen,
3769 void __user *oldval,
3770 size_t __user *oldlenp,
1f29bcd7 3771 void __user *newval, size_t newlen)
1da177e4
LT		 3772{
3773 int *valp = table->data;
3774 int new;
3775
3776 if (!newval || !newlen)
3777 return 0;
3778 if (newlen != sizeof(int))
3779 return -EINVAL;
3780 if (get_user(new, (int __user *)newval))
3781 return -EFAULT;
3782 if (new == *valp)
3783 return 0;
3784 if (oldval && oldlenp) {
3785 size_t len;
3786 if (get_user(len, oldlenp))
3787 return -EFAULT;
3788 if (len) {
3789 if (len > table->maxlen)
3790 len = table->maxlen;
3791 if (copy_to_user(oldval, valp, len))
3792 return -EFAULT;
3793 if (put_user(len, oldlenp))
3794 return -EFAULT;
3795 }
3796 }
3797
3798 if (valp != &ipv6_devconf_dflt.forwarding) {
3799 if (valp != &ipv6_devconf.forwarding) {
3800 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3801 int changed;
3802 if (unlikely(idev == NULL))
3803 return -ENODEV;
3804 changed = (!*valp) ^ (!new);
3805 *valp = new;
3806 if (changed)
3807 dev_forward_change(idev);
3808 } else {
3809 *valp = new;
3810 addrconf_forward_change();
3811 }
3812
3813 if (*valp)
3814 rt6_purge_dflt_routers();
3815 } else
3816 *valp = new;
3817
3818 return 1;
3819}
3820
3821static struct addrconf_sysctl_table
3822{
3823 struct ctl_table_header *sysctl_header;
3824 ctl_table addrconf_vars[__NET_IPV6_MAX];
3825 ctl_table addrconf_dev[2];
3826 ctl_table addrconf_conf_dir[2];
3827 ctl_table addrconf_proto_dir[2];
3828 ctl_table addrconf_root_dir[2];
ab32ea5d 3829} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3830 .sysctl_header = NULL,
3831 .addrconf_vars = {
1ab1457c 3832 {
1da177e4
LT		 3833 .ctl_name = NET_IPV6_FORWARDING,
3834 .procname = "forwarding",
1ab1457c 3835 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3836 .maxlen = sizeof(int),
3837 .mode = 0644,
1ab1457c 3838 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3839 .strategy = &addrconf_sysctl_forward_strategy,
3840 },
3841 {
3842 .ctl_name = NET_IPV6_HOP_LIMIT,
3843 .procname = "hop_limit",
1ab1457c 3844 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3845 .maxlen = sizeof(int),
3846 .mode = 0644,
3847 .proc_handler = proc_dointvec,
3848 },
3849 {
3850 .ctl_name = NET_IPV6_MTU,
3851 .procname = "mtu",
3852 .data = &ipv6_devconf.mtu6,
1ab1457c 3853 .maxlen = sizeof(int),
1da177e4 3854 .mode = 0644,
1ab1457c 3855 .proc_handler = &proc_dointvec,
1da177e4
LT		 3856 },
3857 {
3858 .ctl_name = NET_IPV6_ACCEPT_RA,
3859 .procname = "accept_ra",
1ab1457c 3860 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3861 .maxlen = sizeof(int),
3862 .mode = 0644,
1ab1457c 3863 .proc_handler = &proc_dointvec,
1da177e4
LT		 3864 },
3865 {
3866 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3867 .procname = "accept_redirects",
1ab1457c 3868 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3869 .maxlen = sizeof(int),
3870 .mode = 0644,
1ab1457c 3871 .proc_handler = &proc_dointvec,
1da177e4
LT		 3872 },
3873 {
3874 .ctl_name = NET_IPV6_AUTOCONF,
3875 .procname = "autoconf",
1ab1457c 3876 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3877 .maxlen = sizeof(int),
3878 .mode = 0644,
1ab1457c 3879 .proc_handler = &proc_dointvec,
1da177e4
LT		 3880 },
3881 {
3882 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3883 .procname = "dad_transmits",
1ab1457c 3884 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3885 .maxlen = sizeof(int),
3886 .mode = 0644,
1ab1457c 3887 .proc_handler = &proc_dointvec,
1da177e4
LT		 3888 },
3889 {
3890 .ctl_name = NET_IPV6_RTR_SOLICITS,
3891 .procname = "router_solicitations",
1ab1457c 3892 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3893 .maxlen = sizeof(int),
3894 .mode = 0644,
1ab1457c 3895 .proc_handler = &proc_dointvec,
1da177e4
LT		 3896 },
3897 {
3898 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3899 .procname = "router_solicitation_interval",
1ab1457c 3900 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3901 .maxlen = sizeof(int),
3902 .mode = 0644,
1ab1457c 3903 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3904 .strategy = &sysctl_jiffies,
3905 },
3906 {
3907 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3908 .procname = "router_solicitation_delay",
1ab1457c 3909 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3910 .maxlen = sizeof(int),
3911 .mode = 0644,
1ab1457c 3912 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3913 .strategy = &sysctl_jiffies,
3914 },
3915 {
3916 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3917 .procname = "force_mld_version",
1ab1457c 3918 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3919 .maxlen = sizeof(int),
3920 .mode = 0644,
1ab1457c 3921 .proc_handler = &proc_dointvec,
1da177e4
LT		 3922 },
3923#ifdef CONFIG_IPV6_PRIVACY
3924 {
3925 .ctl_name = NET_IPV6_USE_TEMPADDR,
3926 .procname = "use_tempaddr",
1ab1457c 3927 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3928 .maxlen = sizeof(int),
3929 .mode = 0644,
1ab1457c 3930 .proc_handler = &proc_dointvec,
1da177e4
LT		 3931 },
3932 {
3933 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3934 .procname = "temp_valid_lft",
1ab1457c 3935 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3936 .maxlen = sizeof(int),
3937 .mode = 0644,
1ab1457c 3938 .proc_handler = &proc_dointvec,
1da177e4
LT		 3939 },
3940 {
3941 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3942 .procname = "temp_prefered_lft",
1ab1457c 3943 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3944 .maxlen = sizeof(int),
3945 .mode = 0644,
1ab1457c 3946 .proc_handler = &proc_dointvec,
1da177e4
LT		 3947 },
3948 {
3949 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3950 .procname = "regen_max_retry",
1ab1457c 3951 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3952 .maxlen = sizeof(int),
3953 .mode = 0644,
1ab1457c 3954 .proc_handler = &proc_dointvec,
1da177e4
LT		 3955 },
3956 {
3957 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3958 .procname = "max_desync_factor",
1ab1457c 3959 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3960 .maxlen = sizeof(int),
3961 .mode = 0644,
1ab1457c 3962 .proc_handler = &proc_dointvec,
1da177e4
LT		 3963 },
3964#endif
3965 {
3966 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3967 .procname = "max_addresses",
3968 .data = &ipv6_devconf.max_addresses,
3969 .maxlen = sizeof(int),
3970 .mode = 0644,
3971 .proc_handler = &proc_dointvec,
3972 },
65f5c7c1
YH		 3973 {
3974 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3975 .procname = "accept_ra_defrtr",
1ab1457c 3976 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3977 .maxlen = sizeof(int),
3978 .mode = 0644,
1ab1457c 3979 .proc_handler = &proc_dointvec,
65f5c7c1 3980 },
c4fd30eb
YH		 3981 {
3982 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3983 .procname = "accept_ra_pinfo",
1ab1457c 3984 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3985 .maxlen = sizeof(int),
3986 .mode = 0644,
1ab1457c 3987 .proc_handler = &proc_dointvec,
c4fd30eb 3988 },
930d6ff2
YH		 3989#ifdef CONFIG_IPV6_ROUTER_PREF
3990 {
3991 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3992 .procname = "accept_ra_rtr_pref",
3993 .data = &ipv6_devconf.accept_ra_rtr_pref,
3994 .maxlen = sizeof(int),
3995 .mode = 0644,
3996 .proc_handler = &proc_dointvec,
3997 },
52e16356
YH		 3998 {
3999 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4000 .procname = "router_probe_interval",
4001 .data = &ipv6_devconf.rtr_probe_interval,
4002 .maxlen = sizeof(int),
4003 .mode = 0644,
4004 .proc_handler = &proc_dointvec_jiffies,
4005 .strategy = &sysctl_jiffies,
4006 },
fa03ef38 4007#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4008 {
4009 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4010 .procname = "accept_ra_rt_info_max_plen",
4011 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4012 .maxlen = sizeof(int),
4013 .mode = 0644,
4014 .proc_handler = &proc_dointvec,
4015 },
4016#endif
930d6ff2 4017#endif
fbea49e1
YH		 4018 {
4019 .ctl_name = NET_IPV6_PROXY_NDP,
4020 .procname = "proxy_ndp",
4021 .data = &ipv6_devconf.proxy_ndp,
4022 .maxlen = sizeof(int),
4023 .mode = 0644,
4024 .proc_handler = &proc_dointvec,
4025 },
0bcbc926
YH		 4026 {
4027 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4028 .procname = "accept_source_route",
4029 .data = &ipv6_devconf.accept_source_route,
4030 .maxlen = sizeof(int),
4031 .mode = 0644,
4032 .proc_handler = &proc_dointvec,
4033 },
95c385b4
NH		 4034#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4035 {
4036 .ctl_name = CTL_UNNUMBERED,
4037 .procname = "optimistic_dad",
4038 .data = &ipv6_devconf.optimistic_dad,
4039 .maxlen = sizeof(int),
4040 .mode = 0644,
4041 .proc_handler = &proc_dointvec,
4042
4043 },
4044#endif
1da177e4
LT		 4045 {
4046 .ctl_name = 0, /* sentinel */
4047 }
4048 },
4049 .addrconf_dev = {
4050 {
4051 .ctl_name = NET_PROTO_CONF_ALL,
4052 .procname = "all",
4053 .mode = 0555,
4054 .child = addrconf_sysctl.addrconf_vars,
4055 },
4056 {
4057 .ctl_name = 0, /* sentinel */
4058 }
4059 },
4060 .addrconf_conf_dir = {
4061 {
4062 .ctl_name = NET_IPV6_CONF,
4063 .procname = "conf",
4064 .mode = 0555,
4065 .child = addrconf_sysctl.addrconf_dev,
4066 },
4067 {
4068 .ctl_name = 0, /* sentinel */
4069 }
4070 },
4071 .addrconf_proto_dir = {
4072 {
4073 .ctl_name = NET_IPV6,
4074 .procname = "ipv6",
4075 .mode = 0555,
4076 .child = addrconf_sysctl.addrconf_conf_dir,
4077 },
4078 {
4079 .ctl_name = 0, /* sentinel */
4080 }
4081 },
4082 .addrconf_root_dir = {
4083 {
4084 .ctl_name = CTL_NET,
4085 .procname = "net",
4086 .mode = 0555,
4087 .child = addrconf_sysctl.addrconf_proto_dir,
4088 },
4089 {
4090 .ctl_name = 0, /* sentinel */
4091 }
4092 },
4093};
4094
4095static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4096{
4097 int i;
4098 struct net_device *dev = idev ? idev->dev : NULL;
4099 struct addrconf_sysctl_table *t;
4100 char *dev_name = NULL;
4101
af879cc7 4102 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4103 if (t == NULL)
4104 return;
1da177e4
LT		 4105 for (i=0; t->addrconf_vars[i].data; i++) {
4106 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4107 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4108 }
4109 if (dev) {
1ab1457c 4110 dev_name = dev->name;
1da177e4
LT		 4111 t->addrconf_dev[0].ctl_name = dev->ifindex;
4112 } else {
4113 dev_name = "default";
4114 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4115 }
4116
1ab1457c
YH		 4117 /*
4118 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4119 * by sysctl and we wouldn't want anyone to change it under our feet
4120 * (see SIOCSIFNAME).
1ab1457c 4121 */
543537bd 4122 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4123 if (!dev_name)
4124 goto free;
4125
4126 t->addrconf_dev[0].procname = dev_name;
4127
4128 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4129 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4130 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4131 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4132
0b4d4147 4133 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4134 if (t->sysctl_header == NULL)
4135 goto free_procname;
4136 else
4137 p->sysctl = t;
4138 return;
4139
4140 /* error path */
4141 free_procname:
4142 kfree(dev_name);
4143 free:
4144 kfree(t);
4145
4146 return;
4147}
4148
4149static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4150{
4151 if (p->sysctl) {
4152 struct addrconf_sysctl_table *t = p->sysctl;
4153 p->sysctl = NULL;
4154 unregister_sysctl_table(t->sysctl_header);
4155 kfree(t->addrconf_dev[0].procname);
4156 kfree(t);
4157 }
4158}
4159
4160
4161#endif
4162
4163/*
4164 * Device notifier
4165 */
4166
4167int register_inet6addr_notifier(struct notifier_block *nb)
4168{
1ab1457c 4169 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4170}
4171
7159039a
YH		 4172EXPORT_SYMBOL(register_inet6addr_notifier);
4173
1da177e4
LT		 4174int unregister_inet6addr_notifier(struct notifier_block *nb)
4175{
1ab1457c 4176 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4177}
4178
7159039a
YH		 4179EXPORT_SYMBOL(unregister_inet6addr_notifier);
4180
1da177e4
LT		 4181/*
4182 * Init / cleanup code
4183 */
4184
4185int __init addrconf_init(void)
4186{
4187 int err = 0;
4188
4189 /* The addrconf netdev notifier requires that loopback_dev
4190 * has it's ipv6 private information allocated and setup
4191 * before it can bring up and give link-local addresses
4192 * to other devices which are up.
4193 *
4194 * Unfortunately, loopback_dev is not necessarily the first
4195 * entry in the global dev_base list of net devices. In fact,
4196 * it is likely to be the very last entry on that list.
4197 * So this causes the notifier registry below to try and
4198 * give link-local addresses to all devices besides loopback_dev
4199 * first, then loopback_dev, which cases all the non-loopback_dev
4200 * devices to fail to get a link-local address.
4201 *
4202 * So, as a temporary fix, allocate the ipv6 structure for
4203 * loopback_dev first by hand.
4204 * Longer term, all of the dependencies ipv6 has upon the loopback
4205 * device and it being up should be removed.
4206 */
4207 rtnl_lock();
4208 if (!ipv6_add_dev(&loopback_dev))
4209 err = -ENOMEM;
4210 rtnl_unlock();
4211 if (err)
4212 return err;
4213
c62dba90 4214 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
9a6bf6fe
YH		 4215#ifdef CONFIG_IPV6_MULTIPLE_TABLES
4216 ip6_prohibit_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4217 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4218#endif
c62dba90 4219
1da177e4
LT		 4220 register_netdevice_notifier(&ipv6_dev_notf);
4221
1da177e4 4222 addrconf_verify(0);
c127ea2c
TG		 4223
4224 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4225 if (err < 0)
4226 goto errout;
4227
4228 /* Only the first call to __rtnl_register can fail */
4229 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4230 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4231 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4232 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4233 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4234
1da177e4
LT		 4235#ifdef CONFIG_SYSCTL
4236 addrconf_sysctl.sysctl_header =
0b4d4147 4237 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4238 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4239#endif
4240
4241 return 0;
c127ea2c
TG		 4242errout:
4243 unregister_netdevice_notifier(&ipv6_dev_notf);
4244
4245 return err;
1da177e4
LT		 4246}
4247
4248void __exit addrconf_cleanup(void)
4249{
1ab1457c 4250 struct net_device *dev;
1ab1457c 4251 struct inet6_ifaddr *ifa;
1da177e4
LT		 4252 int i;
4253
4254 unregister_netdevice_notifier(&ipv6_dev_notf);
4255
1da177e4
LT		 4256#ifdef CONFIG_SYSCTL
4257 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4258 addrconf_sysctl_unregister(&ipv6_devconf);
4259#endif
4260
4261 rtnl_lock();
4262
4263 /*
4264 * clean dev list.
4265 */
4266
881d966b 4267 for_each_netdev(&init_net, dev) {
dffe4f04 4268 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4269 continue;
4270 addrconf_ifdown(dev, 1);
4271 }
4272 addrconf_ifdown(&loopback_dev, 2);
4273
4274 /*
4275 * Check hash table.
4276 */
4277
4278 write_lock_bh(&addrconf_hash_lock);
4279 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4280 for (ifa=inet6_addr_lst[i]; ifa; ) {
4281 struct inet6_ifaddr *bifa;
4282
4283 bifa = ifa;
4284 ifa = ifa->lst_next;
4285 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4286 /* Do not free it; something is wrong.
4287 Now we can investigate it with debugger.
4288 */
4289 }
4290 }
4291 write_unlock_bh(&addrconf_hash_lock);
4292
4293 del_timer(&addr_chk_timer);
4294
4295 rtnl_unlock();
4296
1da177e4 4297#ifdef CONFIG_PROC_FS
457c4cbc 4298 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 4299#endif
4300}
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