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[IPV6] ADDRCONF: Allow address selection policy with ifindex.
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
104static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
105static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
106#endif
107
108#ifdef CONFIG_IPV6_PRIVACY
109static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 110static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 111static void ipv6_regen_rndid(unsigned long data);
112
113static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 114#endif
115
116static int ipv6_count_addresses(struct inet6_dev *idev);
117
118/*
119 * Configured unicast address hash table
120 */
121static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122static DEFINE_RWLOCK(addrconf_hash_lock);
123
1da177e4
LT		 124static void addrconf_verify(unsigned long);
125
8d06afab 126static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 127static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132static int addrconf_ifdown(struct net_device *dev, int how);
133
e431b8c0 134static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 135static void addrconf_dad_timer(unsigned long data);
136static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 137static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 138static void addrconf_rs_timer(unsigned long data);
139static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
1ab1457c 142static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 143 struct prefix_info *pinfo);
144static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
e041c683 146static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 147
ab32ea5d 148struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160#ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166#endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 168 .accept_ra_defrtr = 1,
c4fd30eb 169 .accept_ra_pinfo = 1,
930d6ff2
YH		 170#ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
52e16356 172 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 173#ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175#endif
930d6ff2 176#endif
fbea49e1 177 .proxy_ndp = 0,
0bcbc926 178 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 179};
180
ab32ea5d 181static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192#ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198#endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 200 .accept_ra_defrtr = 1,
c4fd30eb 201 .accept_ra_pinfo = 1,
930d6ff2
YH		 202#ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
52e16356 204 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 205#ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207#endif
930d6ff2 208#endif
fbea49e1 209 .proxy_ndp = 0,
0bcbc926 210 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 211};
212
213/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 214const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 215const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
216
f24e3d65
MC		 217/* Check if a valid qdisc is available */
218static inline int addrconf_qdisc_ok(struct net_device *dev)
219{
220 return (dev->qdisc != &noop_qdisc);
221}
222
1da177e4
LT		 223static void addrconf_del_timer(struct inet6_ifaddr *ifp)
224{
225 if (del_timer(&ifp->timer))
226 __in6_ifa_put(ifp);
227}
228
229enum addrconf_timer_t
230{
231 AC_NONE,
232 AC_DAD,
233 AC_RS,
234};
235
236static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
238 unsigned long when)
239{
240 if (!del_timer(&ifp->timer))
241 in6_ifa_hold(ifp);
242
243 switch (what) {
244 case AC_DAD:
245 ifp->timer.function = addrconf_dad_timer;
246 break;
247 case AC_RS:
248 ifp->timer.function = addrconf_rs_timer;
249 break;
250 default:;
251 }
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
254}
255
7f7d9a6b
HX		 256static int snmp6_alloc_dev(struct inet6_dev *idev)
257{
7f7d9a6b
HX		 258 if (snmp_mib_init((void **)idev->stats.ipv6,
259 sizeof(struct ipstats_mib),
260 __alignof__(struct ipstats_mib)) < 0)
261 goto err_ip;
262 if (snmp_mib_init((void **)idev->stats.icmpv6,
263 sizeof(struct icmpv6_mib),
264 __alignof__(struct icmpv6_mib)) < 0)
265 goto err_icmp;
14878f75
DS		 266 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
267 sizeof(struct icmpv6msg_mib),
268 __alignof__(struct icmpv6msg_mib)) < 0)
269 goto err_icmpmsg;
7f7d9a6b
HX		 270
271 return 0;
272
14878f75
DS		 273err_icmpmsg:
274 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 275err_icmp:
276 snmp_mib_free((void **)idev->stats.ipv6);
277err_ip:
aaf70ec7 278 return -ENOMEM;
7f7d9a6b
HX		 279}
280
16910b98 281static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 282{
14878f75 283 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 284 snmp_mib_free((void **)idev->stats.icmpv6);
285 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 286}
287
1da177e4
LT		 288/* Nobody refers to this device, we may destroy it. */
289
8814c4b5
YH		 290static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
291{
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
293 kfree(idev);
294}
295
1da177e4
LT		 296void in6_dev_finish_destroy(struct inet6_dev *idev)
297{
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301#ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
303#endif
304 dev_put(dev);
305 if (!idev->dead) {
306 printk("Freeing alive inet6 device %p\n", idev);
307 return;
308 }
309 snmp6_free_dev(idev);
8814c4b5 310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 311}
312
7159039a
YH		 313EXPORT_SYMBOL(in6_dev_finish_destroy);
314
1da177e4
LT		 315static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
316{
317 struct inet6_dev *ndev;
d88ae4cc 318 struct in6_addr maddr;
1da177e4
LT		 319
320 ASSERT_RTNL();
321
322 if (dev->mtu < IPV6_MIN_MTU)
323 return NULL;
324
1ab1457c 325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 326
1ab1457c
YH		 327 if (ndev == NULL)
328 return NULL;
322f74a4
IO		 329
330 rwlock_init(&ndev->lock);
331 ndev->dev = dev;
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
337 kfree(ndev);
338 return NULL;
339 }
340 /* We refer to the device */
341 dev_hold(dev);
1da177e4 342
322f74a4
IO		 343 if (snmp6_alloc_dev(ndev) < 0) {
344 ADBG((KERN_WARNING
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
348 ndev->dead = 1;
349 in6_dev_finish_destroy(ndev);
350 return NULL;
351 }
1da177e4 352
322f74a4
IO		 353 if (snmp6_register_dev(ndev) < 0) {
354 ADBG((KERN_WARNING
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 ndev->dead = 1;
359 in6_dev_finish_destroy(ndev);
360 return NULL;
361 }
362
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
365 */
366 in6_dev_hold(ndev);
1da177e4
LT		 367
368#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 369 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 370 if ((dev->flags&IFF_LOOPBACK) ||
371 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 372#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
373 dev->type == ARPHRD_SIT ||
374#endif
375 dev->type == ARPHRD_NONE) {
322f74a4
IO		 376 printk(KERN_INFO
377 "%s: Disabled Privacy Extensions\n",
378 dev->name);
379 ndev->cnf.use_tempaddr = -1;
380 } else {
381 in6_dev_hold(ndev);
382 ipv6_regen_rndid((unsigned long) ndev);
383 }
1da177e4
LT		 384#endif
385
f24e3d65 386 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 387 ndev->if_flags |= IF_READY;
388
322f74a4
IO		 389 ipv6_mc_init_dev(ndev);
390 ndev->tstamp = jiffies;
1da177e4 391#ifdef CONFIG_SYSCTL
322f74a4
IO		 392 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
393 NET_IPV6_NEIGH, "ipv6",
394 &ndisc_ifinfo_sysctl_change,
395 NULL);
396 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 397#endif
30c4cf57
DS		 398 /* protected by rtnl_lock */
399 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 400
401 /* Join all-node multicast group */
402 ipv6_addr_all_nodes(&maddr);
403 ipv6_dev_mc_inc(dev, &maddr);
404
1da177e4
LT		 405 return ndev;
406}
407
408static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
409{
410 struct inet6_dev *idev;
411
412 ASSERT_RTNL();
413
414 if ((idev = __in6_dev_get(dev)) == NULL) {
415 if ((idev = ipv6_add_dev(dev)) == NULL)
416 return NULL;
417 }
c5e33bdd 418
1da177e4
LT		 419 if (dev->flags&IFF_UP)
420 ipv6_mc_up(idev);
421 return idev;
422}
423
424#ifdef CONFIG_SYSCTL
425static void dev_forward_change(struct inet6_dev *idev)
426{
427 struct net_device *dev;
428 struct inet6_ifaddr *ifa;
429 struct in6_addr addr;
430
431 if (!idev)
432 return;
433 dev = idev->dev;
434 if (dev && (dev->flags & IFF_MULTICAST)) {
435 ipv6_addr_all_routers(&addr);
1ab1457c 436
1da177e4
LT		 437 if (idev->cnf.forwarding)
438 ipv6_dev_mc_inc(dev, &addr);
439 else
440 ipv6_dev_mc_dec(dev, &addr);
441 }
442 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 443 if (ifa->flags&IFA_F_TENTATIVE)
444 continue;
1da177e4
LT		 445 if (idev->cnf.forwarding)
446 addrconf_join_anycast(ifa);
447 else
448 addrconf_leave_anycast(ifa);
449 }
450}
451
452
453static void addrconf_forward_change(void)
454{
455 struct net_device *dev;
456 struct inet6_dev *idev;
457
458 read_lock(&dev_base_lock);
881d966b 459 for_each_netdev(&init_net, dev) {
8814c4b5 460 rcu_read_lock();
1da177e4
LT		 461 idev = __in6_dev_get(dev);
462 if (idev) {
463 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
464 idev->cnf.forwarding = ipv6_devconf.forwarding;
465 if (changed)
466 dev_forward_change(idev);
467 }
8814c4b5 468 rcu_read_unlock();
1da177e4
LT		 469 }
470 read_unlock(&dev_base_lock);
471}
472#endif
473
474/* Nobody refers to this ifaddr, destroy it */
475
476void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
477{
478 BUG_TRAP(ifp->if_next==NULL);
479 BUG_TRAP(ifp->lst_next==NULL);
480#ifdef NET_REFCNT_DEBUG
481 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
482#endif
483
484 in6_dev_put(ifp->idev);
485
486 if (del_timer(&ifp->timer))
487 printk("Timer is still running, when freeing ifa=%p\n", ifp);
488
489 if (!ifp->dead) {
490 printk("Freeing alive inet6 address %p\n", ifp);
491 return;
492 }
493 dst_release(&ifp->rt->u.dst);
494
495 kfree(ifp);
496}
497
e55ffac6
BH		 498static void
499ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
500{
501 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 502 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 503
504 /*
505 * Each device address list is sorted in order of scope -
506 * global before linklocal.
507 */
508 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
509 ifap = &ifa->if_next) {
8a6ce0c0 510 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 511 break;
512 }
513
514 ifp->if_next = *ifap;
515 *ifap = ifp;
516}
517
1da177e4
LT		 518/* On success it returns ifp with increased reference count */
519
520static struct inet6_ifaddr *
521ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 522 int scope, u32 flags)
1da177e4
LT		 523{
524 struct inet6_ifaddr *ifa = NULL;
525 struct rt6_info *rt;
526 int hash;
527 int err = 0;
528
8814c4b5 529 rcu_read_lock_bh();
1da177e4
LT		 530 if (idev->dead) {
531 err = -ENODEV; /*XXX*/
532 goto out2;
533 }
534
535 write_lock(&addrconf_hash_lock);
536
537 /* Ignore adding duplicate addresses on an interface */
538 if (ipv6_chk_same_addr(addr, idev->dev)) {
539 ADBG(("ipv6_add_addr: already assigned\n"));
540 err = -EEXIST;
541 goto out;
542 }
543
322f74a4 544 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 545
546 if (ifa == NULL) {
547 ADBG(("ipv6_add_addr: malloc failed\n"));
548 err = -ENOBUFS;
549 goto out;
550 }
551
552 rt = addrconf_dst_alloc(idev, addr, 0);
553 if (IS_ERR(rt)) {
554 err = PTR_ERR(rt);
555 goto out;
556 }
557
1da177e4
LT		 558 ipv6_addr_copy(&ifa->addr, addr);
559
560 spin_lock_init(&ifa->lock);
561 init_timer(&ifa->timer);
562 ifa->timer.data = (unsigned long) ifa;
563 ifa->scope = scope;
564 ifa->prefix_len = pfxlen;
565 ifa->flags = flags | IFA_F_TENTATIVE;
566 ifa->cstamp = ifa->tstamp = jiffies;
567
57f5f544
KF		 568 ifa->rt = rt;
569
95c385b4
NH		 570 /*
571 * part one of RFC 4429, section 3.3
572 * We should not configure an address as
573 * optimistic if we do not yet know the link
574 * layer address of our nexhop router
575 */
576
577 if (rt->rt6i_nexthop == NULL)
578 ifa->flags &= ~IFA_F_OPTIMISTIC;
579
1da177e4
LT		 580 ifa->idev = idev;
581 in6_dev_hold(idev);
582 /* For caller */
583 in6_ifa_hold(ifa);
584
585 /* Add to big hash table */
586 hash = ipv6_addr_hash(addr);
587
588 ifa->lst_next = inet6_addr_lst[hash];
589 inet6_addr_lst[hash] = ifa;
590 in6_ifa_hold(ifa);
591 write_unlock(&addrconf_hash_lock);
592
593 write_lock(&idev->lock);
594 /* Add to inet6_dev unicast addr list. */
e55ffac6 595 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 596
597#ifdef CONFIG_IPV6_PRIVACY
598 if (ifa->flags&IFA_F_TEMPORARY) {
599 ifa->tmp_next = idev->tempaddr_list;
600 idev->tempaddr_list = ifa;
601 in6_ifa_hold(ifa);
602 }
603#endif
604
1da177e4
LT		 605 in6_ifa_hold(ifa);
606 write_unlock(&idev->lock);
607out2:
8814c4b5 608 rcu_read_unlock_bh();
1da177e4 609
fd92833a 610 if (likely(err == 0))
e041c683 611 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 612 else {
613 kfree(ifa);
614 ifa = ERR_PTR(err);
615 }
616
617 return ifa;
618out:
619 write_unlock(&addrconf_hash_lock);
620 goto out2;
621}
622
623/* This function wants to get referenced ifp and releases it before return */
624
625static void ipv6_del_addr(struct inet6_ifaddr *ifp)
626{
627 struct inet6_ifaddr *ifa, **ifap;
628 struct inet6_dev *idev = ifp->idev;
629 int hash;
630 int deleted = 0, onlink = 0;
631 unsigned long expires = jiffies;
632
633 hash = ipv6_addr_hash(&ifp->addr);
634
635 ifp->dead = 1;
636
637 write_lock_bh(&addrconf_hash_lock);
638 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
639 ifap = &ifa->lst_next) {
640 if (ifa == ifp) {
641 *ifap = ifa->lst_next;
642 __in6_ifa_put(ifp);
643 ifa->lst_next = NULL;
644 break;
645 }
646 }
647 write_unlock_bh(&addrconf_hash_lock);
648
649 write_lock_bh(&idev->lock);
650#ifdef CONFIG_IPV6_PRIVACY
651 if (ifp->flags&IFA_F_TEMPORARY) {
652 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
653 ifap = &ifa->tmp_next) {
654 if (ifa == ifp) {
655 *ifap = ifa->tmp_next;
656 if (ifp->ifpub) {
657 in6_ifa_put(ifp->ifpub);
658 ifp->ifpub = NULL;
659 }
660 __in6_ifa_put(ifp);
661 ifa->tmp_next = NULL;
662 break;
663 }
664 }
665 }
666#endif
667
1d142804 668 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 669 if (ifa == ifp) {
670 *ifap = ifa->if_next;
671 __in6_ifa_put(ifp);
672 ifa->if_next = NULL;
673 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
674 break;
675 deleted = 1;
1d142804 676 continue;
1da177e4
LT		 677 } else if (ifp->flags & IFA_F_PERMANENT) {
678 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
679 ifp->prefix_len)) {
680 if (ifa->flags & IFA_F_PERMANENT) {
681 onlink = 1;
682 if (deleted)
683 break;
684 } else {
685 unsigned long lifetime;
686
687 if (!onlink)
688 onlink = -1;
689
690 spin_lock(&ifa->lock);
691 lifetime = min_t(unsigned long,
692 ifa->valid_lft, 0x7fffffffUL/HZ);
693 if (time_before(expires,
694 ifa->tstamp + lifetime * HZ))
695 expires = ifa->tstamp + lifetime * HZ;
696 spin_unlock(&ifa->lock);
697 }
698 }
699 }
1d142804 700 ifap = &ifa->if_next;
1da177e4
LT		 701 }
702 write_unlock_bh(&idev->lock);
703
704 ipv6_ifa_notify(RTM_DELADDR, ifp);
705
e041c683 706 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 707
708 addrconf_del_timer(ifp);
709
710 /*
711 * Purge or update corresponding prefix
712 *
713 * 1) we don't purge prefix here if address was not permanent.
714 * prefix is managed by its own lifetime.
715 * 2) if there're no addresses, delete prefix.
716 * 3) if there're still other permanent address(es),
717 * corresponding prefix is still permanent.
718 * 4) otherwise, update prefix lifetime to the
719 * longest valid lifetime among the corresponding
720 * addresses on the device.
721 * Note: subsequent RA will update lifetime.
722 *
723 * --yoshfuji
724 */
725 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
726 struct in6_addr prefix;
727 struct rt6_info *rt;
728
729 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
730 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
731
732 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
733 if (onlink == 0) {
e0a1ad73 734 ip6_del_rt(rt);
1da177e4
LT		 735 rt = NULL;
736 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
737 rt->rt6i_expires = expires;
738 rt->rt6i_flags |= RTF_EXPIRES;
739 }
740 }
741 dst_release(&rt->u.dst);
742 }
743
744 in6_ifa_put(ifp);
745}
746
747#ifdef CONFIG_IPV6_PRIVACY
748static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
749{
750 struct inet6_dev *idev = ifp->idev;
751 struct in6_addr addr, *tmpaddr;
752 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
753 int tmp_plen;
754 int ret = 0;
755 int max_addresses;
95c385b4 756 u32 addr_flags;
1da177e4
LT		 757
758 write_lock(&idev->lock);
759 if (ift) {
760 spin_lock_bh(&ift->lock);
761 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
762 spin_unlock_bh(&ift->lock);
763 tmpaddr = &addr;
764 } else {
765 tmpaddr = NULL;
766 }
767retry:
768 in6_dev_hold(idev);
769 if (idev->cnf.use_tempaddr <= 0) {
770 write_unlock(&idev->lock);
771 printk(KERN_INFO
772 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
773 in6_dev_put(idev);
774 ret = -1;
775 goto out;
776 }
777 spin_lock_bh(&ifp->lock);
778 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
779 idev->cnf.use_tempaddr = -1; /*XXX*/
780 spin_unlock_bh(&ifp->lock);
781 write_unlock(&idev->lock);
782 printk(KERN_WARNING
783 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
784 in6_dev_put(idev);
785 ret = -1;
786 goto out;
787 }
788 in6_ifa_hold(ifp);
789 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
790 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
791 spin_unlock_bh(&ifp->lock);
792 write_unlock(&idev->lock);
793 printk(KERN_WARNING
794 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
795 in6_ifa_put(ifp);
796 in6_dev_put(idev);
797 ret = -1;
798 goto out;
799 }
800 memcpy(&addr.s6_addr[8], idev->rndid, 8);
801 tmp_valid_lft = min_t(__u32,
802 ifp->valid_lft,
803 idev->cnf.temp_valid_lft);
1ab1457c
YH		 804 tmp_prefered_lft = min_t(__u32,
805 ifp->prefered_lft,
1da177e4
LT		 806 idev->cnf.temp_prefered_lft - desync_factor / HZ);
807 tmp_plen = ifp->prefix_len;
808 max_addresses = idev->cnf.max_addresses;
809 tmp_cstamp = ifp->cstamp;
810 tmp_tstamp = ifp->tstamp;
811 spin_unlock_bh(&ifp->lock);
812
813 write_unlock(&idev->lock);
95c385b4
NH		 814
815 addr_flags = IFA_F_TEMPORARY;
816 /* set in addrconf_prefix_rcv() */
817 if (ifp->flags & IFA_F_OPTIMISTIC)
818 addr_flags |= IFA_F_OPTIMISTIC;
819
1da177e4 820 ift = !max_addresses ||
1ab1457c 821 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 822 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 823 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
824 addr_flags) : NULL;
1da177e4
LT		 825 if (!ift || IS_ERR(ift)) {
826 in6_ifa_put(ifp);
827 in6_dev_put(idev);
828 printk(KERN_INFO
829 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
830 tmpaddr = &addr;
831 write_lock(&idev->lock);
832 goto retry;
833 }
834
835 spin_lock_bh(&ift->lock);
836 ift->ifpub = ifp;
837 ift->valid_lft = tmp_valid_lft;
838 ift->prefered_lft = tmp_prefered_lft;
839 ift->cstamp = tmp_cstamp;
840 ift->tstamp = tmp_tstamp;
841 spin_unlock_bh(&ift->lock);
842
843 addrconf_dad_start(ift, 0);
844 in6_ifa_put(ift);
845 in6_dev_put(idev);
846out:
847 return ret;
848}
849#endif
850
851/*
072047e4 852 * Choose an appropriate source address (RFC3484)
1da177e4 853 */
072047e4
YH		 854struct ipv6_saddr_score {
855 int addr_type;
856 unsigned int attrs;
857 int matchlen;
0d27b427 858 int scope;
072047e4
YH		 859 unsigned int rule;
860};
861
862#define IPV6_SADDR_SCORE_LOCAL 0x0001
863#define IPV6_SADDR_SCORE_PREFERRED 0x0004
864#define IPV6_SADDR_SCORE_HOA 0x0008
865#define IPV6_SADDR_SCORE_OIF 0x0010
866#define IPV6_SADDR_SCORE_LABEL 0x0020
867#define IPV6_SADDR_SCORE_PRIVACY 0x0040
868
b6f99a21 869static inline int ipv6_saddr_preferred(int type)
1da177e4 870{
072047e4
YH		 871 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
872 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
873 return 1;
874 return 0;
1da177e4
LT		 875}
876
072047e4 877/* static matching label */
303065a8
YH		 878static inline int ipv6_addr_label(const struct in6_addr *addr, int type,
879 int ifindex)
072047e4
YH		 880{
881 /*
882 * prefix (longest match) label
883 * -----------------------------
884 * ::1/128 0
885 * ::/0 1
886 * 2002::/16 2
887 * ::/96 3
888 * ::ffff:0:0/96 4
102128e3
ŁS		 889 * fc00::/7 5
890 * 2001::/32 6
072047e4
YH		 891 */
892 if (type & IPV6_ADDR_LOOPBACK)
893 return 0;
894 else if (type & IPV6_ADDR_COMPATv4)
895 return 3;
896 else if (type & IPV6_ADDR_MAPPED)
897 return 4;
102128e3
ŁS		 898 else if (addr->s6_addr32[0] == htonl(0x20010000))
899 return 6;
072047e4
YH		 900 else if (addr->s6_addr16[0] == htons(0x2002))
901 return 2;
102128e3
ŁS		 902 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
903 return 5;
072047e4
YH		 904 return 1;
905}
1da177e4 906
072047e4 907int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 908 struct in6_addr *daddr, struct in6_addr *saddr)
909{
072047e4
YH		 910 struct ipv6_saddr_score hiscore;
911 struct inet6_ifaddr *ifa_result = NULL;
912 int daddr_type = __ipv6_addr_type(daddr);
913 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 914 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
915 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 916 struct net_device *dev;
1da177e4 917
072047e4 918 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 919
072047e4 920 read_lock(&dev_base_lock);
8814c4b5 921 rcu_read_lock();
1da177e4 922
881d966b 923 for_each_netdev(&init_net, dev) {
072047e4
YH		 924 struct inet6_dev *idev;
925 struct inet6_ifaddr *ifa;
926
927 /* Rule 0: Candidate Source Address (section 4)
928 * - multicast and link-local destination address,
929 * the set of candidate source address MUST only
930 * include addresses assigned to interfaces
931 * belonging to the same link as the outgoing
932 * interface.
933 * (- For site-local destination addresses, the
934 * set of candidate source addresses MUST only
935 * include addresses assigned to interfaces
936 * belonging to the same site as the outgoing
937 * interface.)
938 */
939 if ((daddr_type & IPV6_ADDR_MULTICAST ||
940 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
941 daddr_dev && dev != daddr_dev)
942 continue;
1da177e4 943
1da177e4 944 idev = __in6_dev_get(dev);
072047e4
YH		 945 if (!idev)
946 continue;
947
948 read_lock_bh(&idev->lock);
949 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
950 struct ipv6_saddr_score score;
951
952 score.addr_type = __ipv6_addr_type(&ifa->addr);
953
6b3ae80a
YH		 954 /* Rule 0:
955 * - Tentative Address (RFC2462 section 5.4)
956 * - A tentative address is not considered
957 * "assigned to an interface" in the traditional
95c385b4 958 * sense, unless it is also flagged as optimistic.
6b3ae80a 959 * - Candidate Source Address (section 4)
072047e4
YH		 960 * - In any case, anycast addresses, multicast
961 * addresses, and the unspecified address MUST
962 * NOT be included in a candidate set.
963 */
95c385b4
NH		 964 if ((ifa->flags & IFA_F_TENTATIVE) &&
965 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 966 continue;
072047e4
YH		 967 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
968 score.addr_type & IPV6_ADDR_MULTICAST)) {
969 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 970 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 971 "assigned as unicast address on %s",
972 dev->name);
973 continue;
974 }
975
976 score.attrs = 0;
977 score.matchlen = 0;
978 score.scope = 0;
979 score.rule = 0;
980
981 if (ifa_result == NULL) {
982 /* record it if the first available entry */
983 goto record_it;
984 }
985
986 /* Rule 1: Prefer same address */
987 if (hiscore.rule < 1) {
988 if (ipv6_addr_equal(&ifa_result->addr, daddr))
989 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 hiscore.rule++;
991 }
992 if (ipv6_addr_equal(&ifa->addr, daddr)) {
993 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
994 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
995 score.rule = 1;
996 goto record_it;
1da177e4 997 }
072047e4
YH		 998 } else {
999 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1000 continue;
1da177e4 1001 }
1da177e4 1002
072047e4
YH		 1003 /* Rule 2: Prefer appropriate scope */
1004 if (hiscore.rule < 2) {
1005 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1006 hiscore.rule++;
1007 }
1008 score.scope = __ipv6_addr_src_scope(score.addr_type);
1009 if (hiscore.scope < score.scope) {
1010 if (hiscore.scope < daddr_scope) {
1011 score.rule = 2;
1012 goto record_it;
1013 } else
1014 continue;
1015 } else if (score.scope < hiscore.scope) {
1016 if (score.scope < daddr_scope)
e55ffac6 1017 break; /* addresses sorted by scope */
072047e4
YH		 1018 else {
1019 score.rule = 2;
1020 goto record_it;
1021 }
1022 }
1da177e4 1023
95c385b4 1024 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1025 if (hiscore.rule < 3) {
1026 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1027 (((ifa_result->flags &
1028 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1029 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1030 hiscore.rule++;
1031 }
1032 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1033 (((ifa->flags &
95c385b4 1034 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1035 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1037 score.rule = 3;
1038 goto record_it;
1039 }
1040 } else {
1041 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1042 continue;
1043 }
1da177e4 1044
3b9f9a1c 1045 /* Rule 4: Prefer home address */
59fbb3a6 1046#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1047 if (hiscore.rule < 4) {
1048 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1049 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1050 hiscore.rule++;
1051 }
1052 if (ifa->flags & IFA_F_HOMEADDRESS) {
1053 score.attrs |= IPV6_SADDR_SCORE_HOA;
1054 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1055 score.rule = 4;
1056 goto record_it;
1057 }
1058 } else {
1059 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1060 continue;
1061 }
1062#else
220bbd74
YH		 1063 if (hiscore.rule < 4)
1064 hiscore.rule++;
3b9f9a1c 1065#endif
072047e4
YH		 1066
1067 /* Rule 5: Prefer outgoing interface */
1068 if (hiscore.rule < 5) {
1069 if (daddr_dev == NULL ||
1070 daddr_dev == ifa_result->idev->dev)
1071 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1072 hiscore.rule++;
1073 }
1074 if (daddr_dev == NULL ||
1075 daddr_dev == ifa->idev->dev) {
1076 score.attrs |= IPV6_SADDR_SCORE_OIF;
1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1078 score.rule = 5;
1079 goto record_it;
1080 }
1081 } else {
1082 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1083 continue;
1084 }
1085
1086 /* Rule 6: Prefer matching label */
1087 if (hiscore.rule < 6) {
c1ee656c 1088 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1089 hiscore.addr_type,
1090 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1091 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1092 hiscore.rule++;
1093 }
c1ee656c 1094 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1095 score.addr_type,
1096 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1097 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1098 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1099 score.rule = 6;
1100 goto record_it;
1da177e4 1101 }
072047e4
YH		 1102 } else {
1103 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1104 continue;
1105 }
1106
44fd0261 1107#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1108 /* Rule 7: Prefer public address
1109 * Note: prefer temprary address if use_tempaddr >= 2
1110 */
1111 if (hiscore.rule < 7) {
1112 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1113 (ifa_result->idev->cnf.use_tempaddr >= 2))
1114 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1115 hiscore.rule++;
1116 }
1117 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1118 (ifa->idev->cnf.use_tempaddr >= 2)) {
1119 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1120 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1121 score.rule = 7;
1122 goto record_it;
1123 }
1124 } else {
1125 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1126 continue;
1127 }
5e2707fa
YH		 1128#else
1129 if (hiscore.rule < 7)
1130 hiscore.rule++;
44fd0261 1131#endif
072047e4 1132 /* Rule 8: Use longest matching prefix */
12da2a43 1133 if (hiscore.rule < 8) {
072047e4 1134 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1135 hiscore.rule++;
1136 }
072047e4
YH		 1137 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1138 if (score.matchlen > hiscore.matchlen) {
1139 score.rule = 8;
1140 goto record_it;
1da177e4 1141 }
072047e4
YH		 1142#if 0
1143 else if (score.matchlen < hiscore.matchlen)
1144 continue;
1145#endif
1146
1147 /* Final Rule: choose first available one */
1148 continue;
1149record_it:
1150 if (ifa_result)
1151 in6_ifa_put(ifa_result);
1152 in6_ifa_hold(ifa);
1153 ifa_result = ifa;
1154 hiscore = score;
1da177e4 1155 }
072047e4 1156 read_unlock_bh(&idev->lock);
1da177e4 1157 }
8814c4b5 1158 rcu_read_unlock();
1da177e4
LT		 1159 read_unlock(&dev_base_lock);
1160
072047e4
YH		 1161 if (!ifa_result)
1162 return -EADDRNOTAVAIL;
1ab1457c 1163
072047e4
YH		 1164 ipv6_addr_copy(saddr, &ifa_result->addr);
1165 in6_ifa_put(ifa_result);
1166 return 0;
1da177e4
LT		 1167}
1168
1169
1170int ipv6_get_saddr(struct dst_entry *dst,
1171 struct in6_addr *daddr, struct in6_addr *saddr)
1172{
7a3025b1 1173 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1174}
1175
7159039a 1176EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1177
95c385b4
NH		 1178int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1179 unsigned char banned_flags)
1da177e4
LT		 1180{
1181 struct inet6_dev *idev;
1182 int err = -EADDRNOTAVAIL;
1183
8814c4b5 1184 rcu_read_lock();
1da177e4
LT		 1185 if ((idev = __in6_dev_get(dev)) != NULL) {
1186 struct inet6_ifaddr *ifp;
1187
1188 read_lock_bh(&idev->lock);
1189 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1190 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1191 ipv6_addr_copy(addr, &ifp->addr);
1192 err = 0;
1193 break;
1194 }
1195 }
1196 read_unlock_bh(&idev->lock);
1197 }
8814c4b5 1198 rcu_read_unlock();
1da177e4
LT		 1199 return err;
1200}
1201
1202static int ipv6_count_addresses(struct inet6_dev *idev)
1203{
1204 int cnt = 0;
1205 struct inet6_ifaddr *ifp;
1206
1207 read_lock_bh(&idev->lock);
1208 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1209 cnt++;
1210 read_unlock_bh(&idev->lock);
1211 return cnt;
1212}
1213
1214int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1215{
1216 struct inet6_ifaddr * ifp;
1217 u8 hash = ipv6_addr_hash(addr);
1218
1219 read_lock_bh(&addrconf_hash_lock);
1220 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1221 if (ipv6_addr_equal(&ifp->addr, addr) &&
1222 !(ifp->flags&IFA_F_TENTATIVE)) {
1223 if (dev == NULL || ifp->idev->dev == dev ||
1224 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1225 break;
1226 }
1227 }
1228 read_unlock_bh(&addrconf_hash_lock);
1229 return ifp != NULL;
1230}
1231
7159039a
YH		 1232EXPORT_SYMBOL(ipv6_chk_addr);
1233
1da177e4
LT		 1234static
1235int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1236{
1237 struct inet6_ifaddr * ifp;
1238 u8 hash = ipv6_addr_hash(addr);
1239
1240 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1241 if (ipv6_addr_equal(&ifp->addr, addr)) {
1242 if (dev == NULL || ifp->idev->dev == dev)
1243 break;
1244 }
1245 }
1246 return ifp != NULL;
1247}
1248
1249struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1250{
1251 struct inet6_ifaddr * ifp;
1252 u8 hash = ipv6_addr_hash(addr);
1253
1254 read_lock_bh(&addrconf_hash_lock);
1255 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1256 if (ipv6_addr_equal(&ifp->addr, addr)) {
1257 if (dev == NULL || ifp->idev->dev == dev ||
1258 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1259 in6_ifa_hold(ifp);
1260 break;
1261 }
1262 }
1263 }
1264 read_unlock_bh(&addrconf_hash_lock);
1265
1266 return ifp;
1267}
1268
1269int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1270{
1271 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1272 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1273 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1274 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1275 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1276 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1277 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1278 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1279
1280 if (!sk2_rcv_saddr && !sk_ipv6only)
1281 return 1;
1282
1283 if (addr_type2 == IPV6_ADDR_ANY &&
1284 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1285 return 1;
1286
1287 if (addr_type == IPV6_ADDR_ANY &&
1288 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1289 return 1;
1290
1291 if (sk2_rcv_saddr6 &&
1292 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1293 return 1;
1294
1295 if (addr_type == IPV6_ADDR_MAPPED &&
1296 !sk2_ipv6only &&
1297 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1298 return 1;
1299
1300 return 0;
1301}
1302
1303/* Gets referenced address, destroys ifaddr */
1304
9f5336e2 1305static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1306{
1da177e4
LT		 1307 if (ifp->flags&IFA_F_PERMANENT) {
1308 spin_lock_bh(&ifp->lock);
1309 addrconf_del_timer(ifp);
1310 ifp->flags |= IFA_F_TENTATIVE;
1311 spin_unlock_bh(&ifp->lock);
1312 in6_ifa_put(ifp);
1313#ifdef CONFIG_IPV6_PRIVACY
1314 } else if (ifp->flags&IFA_F_TEMPORARY) {
1315 struct inet6_ifaddr *ifpub;
1316 spin_lock_bh(&ifp->lock);
1317 ifpub = ifp->ifpub;
1318 if (ifpub) {
1319 in6_ifa_hold(ifpub);
1320 spin_unlock_bh(&ifp->lock);
1321 ipv6_create_tempaddr(ifpub, ifp);
1322 in6_ifa_put(ifpub);
1323 } else {
1324 spin_unlock_bh(&ifp->lock);
1325 }
1326 ipv6_del_addr(ifp);
1327#endif
1328 } else
1329 ipv6_del_addr(ifp);
1330}
1331
3c21edbd
YH		 1332void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1333{
1334 if (net_ratelimit())
1335 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1336 addrconf_dad_stop(ifp);
1337}
1da177e4
LT		 1338
1339/* Join to solicited addr multicast group. */
1340
1341void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1342{
1343 struct in6_addr maddr;
1344
1345 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1346 return;
1347
1348 addrconf_addr_solict_mult(addr, &maddr);
1349 ipv6_dev_mc_inc(dev, &maddr);
1350}
1351
1352void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1353{
1354 struct in6_addr maddr;
1355
1356 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1357 return;
1358
1359 addrconf_addr_solict_mult(addr, &maddr);
1360 __ipv6_dev_mc_dec(idev, &maddr);
1361}
1362
20380731 1363static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1364{
1365 struct in6_addr addr;
1366 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1367 if (ipv6_addr_any(&addr))
1368 return;
1369 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1370}
1371
20380731 1372static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1373{
1374 struct in6_addr addr;
1375 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1376 if (ipv6_addr_any(&addr))
1377 return;
1378 __ipv6_dev_ac_dec(ifp->idev, &addr);
1379}
1380
073a8e0e
YH		 1381static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1382{
1383 if (dev->addr_len != ETH_ALEN)
1384 return -1;
1385 memcpy(eui, dev->dev_addr, 3);
1386 memcpy(eui + 5, dev->dev_addr + 3, 3);
1387
1388 /*
1389 * The zSeries OSA network cards can be shared among various
1390 * OS instances, but the OSA cards have only one MAC address.
1391 * This leads to duplicate address conflicts in conjunction
1392 * with IPv6 if more than one instance uses the same card.
1393 *
1394 * The driver for these cards can deliver a unique 16-bit
1395 * identifier for each instance sharing the same card. It is
1396 * placed instead of 0xFFFE in the interface identifier. The
1397 * "u" bit of the interface identifier is not inverted in this
1398 * case. Hence the resulting interface identifier has local
1399 * scope according to RFC2373.
1400 */
1401 if (dev->dev_id) {
1402 eui[3] = (dev->dev_id >> 8) & 0xFF;
1403 eui[4] = dev->dev_id & 0xFF;
1404 } else {
1405 eui[3] = 0xFF;
1406 eui[4] = 0xFE;
1407 eui[0] ^= 2;
1408 }
1409 return 0;
1410}
1411
1412static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1413{
1414 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1415 if (dev->addr_len != ARCNET_ALEN)
1416 return -1;
1417 memset(eui, 0, 7);
1418 eui[7] = *(u8*)dev->dev_addr;
1419 return 0;
1420}
1421
1422static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1423{
1424 if (dev->addr_len != INFINIBAND_ALEN)
1425 return -1;
1426 memcpy(eui, dev->dev_addr + 12, 8);
1427 eui[0] |= 2;
1428 return 0;
1429}
1430
1da177e4
LT		 1431static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1432{
1433 switch (dev->type) {
1434 case ARPHRD_ETHER:
1435 case ARPHRD_FDDI:
1436 case ARPHRD_IEEE802_TR:
073a8e0e 1437 return addrconf_ifid_eui48(eui, dev);
1da177e4 1438 case ARPHRD_ARCNET:
073a8e0e 1439 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1440 case ARPHRD_INFINIBAND:
073a8e0e 1441 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1442 }
1443 return -1;
1444}
1445
1446static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1447{
1448 int err = -1;
1449 struct inet6_ifaddr *ifp;
1450
1451 read_lock_bh(&idev->lock);
1452 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1453 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1454 memcpy(eui, ifp->addr.s6_addr+8, 8);
1455 err = 0;
1456 break;
1457 }
1458 }
1459 read_unlock_bh(&idev->lock);
1460 return err;
1461}
1462
1463#ifdef CONFIG_IPV6_PRIVACY
1464/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1465static int __ipv6_regen_rndid(struct inet6_dev *idev)
1466{
1da177e4 1467regen:
955189ef 1468 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1469 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1470
1471 /*
1472 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1473 * check if generated address is not inappropriate
1474 *
1475 * - Reserved subnet anycast (RFC 2526)
1476 * 11111101 11....11 1xxxxxxx
1477 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1478 * 00-00-5E-FE-xx-xx-xx-xx
1479 * - value 0
1480 * - XXX: already assigned to an address on the device
1481 */
1ab1457c 1482 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1483 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1484 (idev->rndid[7]&0x80))
1485 goto regen;
1486 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1487 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1488 goto regen;
1489 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1490 goto regen;
1491 }
1492
1493 return 0;
1494}
1495
1496static void ipv6_regen_rndid(unsigned long data)
1497{
1498 struct inet6_dev *idev = (struct inet6_dev *) data;
1499 unsigned long expires;
1500
8814c4b5 1501 rcu_read_lock_bh();
1da177e4
LT		 1502 write_lock_bh(&idev->lock);
1503
1504 if (idev->dead)
1505 goto out;
1506
1507 if (__ipv6_regen_rndid(idev) < 0)
1508 goto out;
1ab1457c 1509
1da177e4 1510 expires = jiffies +
1ab1457c 1511 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1512 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1513 if (time_before(expires, jiffies)) {
1514 printk(KERN_WARNING
1515 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1516 idev->dev->name);
1517 goto out;
1518 }
1519
1520 if (!mod_timer(&idev->regen_timer, expires))
1521 in6_dev_hold(idev);
1522
1523out:
1524 write_unlock_bh(&idev->lock);
8814c4b5 1525 rcu_read_unlock_bh();
1da177e4
LT		 1526 in6_dev_put(idev);
1527}
1528
1529static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1530 int ret = 0;
1531
1532 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1533 ret = __ipv6_regen_rndid(idev);
1534 return ret;
1535}
1536#endif
1537
1538/*
1539 * Add prefix route.
1540 */
1541
1542static void
1543addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1544 unsigned long expires, u32 flags)
1da177e4 1545{
86872cb5
TG		 1546 struct fib6_config cfg = {
1547 .fc_table = RT6_TABLE_PREFIX,
1548 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1549 .fc_ifindex = dev->ifindex,
1550 .fc_expires = expires,
1551 .fc_dst_len = plen,
1552 .fc_flags = RTF_UP | flags,
1553 };
1da177e4 1554
86872cb5 1555 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1556
1557 /* Prevent useless cloning on PtP SIT.
1558 This thing is done here expecting that the whole
1559 class of non-broadcast devices need not cloning.
1560 */
0be669bb 1561#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1562 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1563 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1564#endif
1da177e4 1565
86872cb5 1566 ip6_route_add(&cfg);
1da177e4
LT		 1567}
1568
1569/* Create "default" multicast route to the interface */
1570
1571static void addrconf_add_mroute(struct net_device *dev)
1572{
86872cb5
TG		 1573 struct fib6_config cfg = {
1574 .fc_table = RT6_TABLE_LOCAL,
1575 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1576 .fc_ifindex = dev->ifindex,
1577 .fc_dst_len = 8,
1578 .fc_flags = RTF_UP,
1579 };
1580
1581 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1582
1583 ip6_route_add(&cfg);
1da177e4
LT		 1584}
1585
0be669bb 1586#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1587static void sit_route_add(struct net_device *dev)
1588{
86872cb5
TG		 1589 struct fib6_config cfg = {
1590 .fc_table = RT6_TABLE_MAIN,
1591 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1592 .fc_ifindex = dev->ifindex,
1593 .fc_dst_len = 96,
1594 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1595 };
1da177e4
LT		 1596
1597 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1598 ip6_route_add(&cfg);
1da177e4 1599}
0be669bb 1600#endif
1da177e4
LT		 1601
1602static void addrconf_add_lroute(struct net_device *dev)
1603{
1604 struct in6_addr addr;
1605
1606 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1607 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1608}
1609
1610static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1611{
1612 struct inet6_dev *idev;
1613
1614 ASSERT_RTNL();
1615
1616 if ((idev = ipv6_find_idev(dev)) == NULL)
1617 return NULL;
1618
1619 /* Add default multicast route */
1620 addrconf_add_mroute(dev);
1621
1622 /* Add link local route */
1623 addrconf_add_lroute(dev);
1624 return idev;
1625}
1626
1627void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1628{
1629 struct prefix_info *pinfo;
1630 __u32 valid_lft;
1631 __u32 prefered_lft;
1632 int addr_type;
1633 unsigned long rt_expires;
1634 struct inet6_dev *in6_dev;
1635
1636 pinfo = (struct prefix_info *) opt;
1ab1457c 1637
1da177e4
LT		 1638 if (len < sizeof(struct prefix_info)) {
1639 ADBG(("addrconf: prefix option too short\n"));
1640 return;
1641 }
1ab1457c 1642
1da177e4
LT		 1643 /*
1644 * Validation checks ([ADDRCONF], page 19)
1645 */
1646
1647 addr_type = ipv6_addr_type(&pinfo->prefix);
1648
1649 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1650 return;
1651
1652 valid_lft = ntohl(pinfo->valid);
1653 prefered_lft = ntohl(pinfo->prefered);
1654
1655 if (prefered_lft > valid_lft) {
1656 if (net_ratelimit())
1657 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1658 return;
1659 }
1660
1661 in6_dev = in6_dev_get(dev);
1662
1663 if (in6_dev == NULL) {
1664 if (net_ratelimit())
1665 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1666 return;
1667 }
1668
1669 /*
1670 * Two things going on here:
1671 * 1) Add routes for on-link prefixes
1672 * 2) Configure prefixes with the auto flag set
1673 */
1674
1675 /* Avoid arithmetic overflow. Really, we could
1676 save rt_expires in seconds, likely valid_lft,
1677 but it would require division in fib gc, that it
1678 not good.
1679 */
1680 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1681 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1682 else
3dd4bc68
YH		 1683 rt_expires = valid_lft * HZ;
1684
1685 /*
1686 * We convert this (in jiffies) to clock_t later.
1687 * Avoid arithmetic overflow there as well.
1688 * Overflow can happen only if HZ < USER_HZ.
1689 */
1690 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1691 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1692
1693 if (pinfo->onlink) {
1694 struct rt6_info *rt;
1695 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1696
1697 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1698 if (rt->rt6i_flags&RTF_EXPIRES) {
1699 if (valid_lft == 0) {
e0a1ad73 1700 ip6_del_rt(rt);
1da177e4
LT		 1701 rt = NULL;
1702 } else {
3dd4bc68 1703 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1704 }
1705 }
1706 } else if (valid_lft) {
1707 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1708 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1709 }
1710 if (rt)
1711 dst_release(&rt->u.dst);
1712 }
1713
1714 /* Try to figure out our local address for this prefix */
1715
1716 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1717 struct inet6_ifaddr * ifp;
1718 struct in6_addr addr;
1719 int create = 0, update_lft = 0;
1720
1721 if (pinfo->prefix_len == 64) {
1722 memcpy(&addr, &pinfo->prefix, 8);
1723 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1724 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1725 in6_dev_put(in6_dev);
1726 return;
1727 }
1728 goto ok;
1729 }
1730 if (net_ratelimit())
1731 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1732 pinfo->prefix_len);
1733 in6_dev_put(in6_dev);
1734 return;
1735
1736ok:
1737
1738 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1739
1740 if (ifp == NULL && valid_lft) {
1741 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1742 u32 addr_flags = 0;
1743
1744#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1745 if (in6_dev->cnf.optimistic_dad &&
1746 !ipv6_devconf.forwarding)
1747 addr_flags = IFA_F_OPTIMISTIC;
1748#endif
1da177e4
LT		 1749
1750 /* Do not allow to create too much of autoconfigured
1751 * addresses; this would be too easy way to crash kernel.
1752 */
1753 if (!max_addresses ||
1754 ipv6_count_addresses(in6_dev) < max_addresses)
1755 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1756 addr_type&IPV6_ADDR_SCOPE_MASK,
1757 addr_flags);
1da177e4
LT		 1758
1759 if (!ifp || IS_ERR(ifp)) {
1760 in6_dev_put(in6_dev);
1761 return;
1762 }
1763
1764 update_lft = create = 1;
1765 ifp->cstamp = jiffies;
1766 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1767 }
1768
1769 if (ifp) {
1770 int flags;
1771 unsigned long now;
1772#ifdef CONFIG_IPV6_PRIVACY
1773 struct inet6_ifaddr *ift;
1774#endif
1775 u32 stored_lft;
1776
1777 /* update lifetime (RFC2462 5.5.3 e) */
1778 spin_lock(&ifp->lock);
1779 now = jiffies;
1780 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1781 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1782 else
1783 stored_lft = 0;
1784 if (!update_lft && stored_lft) {
1785 if (valid_lft > MIN_VALID_LIFETIME ||
1786 valid_lft > stored_lft)
1787 update_lft = 1;
1788 else if (stored_lft <= MIN_VALID_LIFETIME) {
1789 /* valid_lft <= stored_lft is always true */
1790 /* XXX: IPsec */
1791 update_lft = 0;
1792 } else {
1793 valid_lft = MIN_VALID_LIFETIME;
1794 if (valid_lft < prefered_lft)
1795 prefered_lft = valid_lft;
1796 update_lft = 1;
1797 }
1798 }
1799
1800 if (update_lft) {
1801 ifp->valid_lft = valid_lft;
1802 ifp->prefered_lft = prefered_lft;
1803 ifp->tstamp = now;
1804 flags = ifp->flags;
1805 ifp->flags &= ~IFA_F_DEPRECATED;
1806 spin_unlock(&ifp->lock);
1807
1808 if (!(flags&IFA_F_TENTATIVE))
1809 ipv6_ifa_notify(0, ifp);
1810 } else
1811 spin_unlock(&ifp->lock);
1812
1813#ifdef CONFIG_IPV6_PRIVACY
1814 read_lock_bh(&in6_dev->lock);
1815 /* update all temporary addresses in the list */
1816 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1817 /*
1818 * When adjusting the lifetimes of an existing
1819 * temporary address, only lower the lifetimes.
1820 * Implementations must not increase the
1821 * lifetimes of an existing temporary address
1822 * when processing a Prefix Information Option.
1823 */
1824 spin_lock(&ift->lock);
1825 flags = ift->flags;
1826 if (ift->valid_lft > valid_lft &&
1827 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1828 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1829 if (ift->prefered_lft > prefered_lft &&
1830 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1831 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1832 spin_unlock(&ift->lock);
1833 if (!(flags&IFA_F_TENTATIVE))
1834 ipv6_ifa_notify(0, ift);
1835 }
1836
1837 if (create && in6_dev->cnf.use_tempaddr > 0) {
1838 /*
1839 * When a new public address is created as described in [ADDRCONF],
1840 * also create a new temporary address.
1841 */
1ab1457c 1842 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1843 ipv6_create_tempaddr(ifp, NULL);
1844 } else {
1845 read_unlock_bh(&in6_dev->lock);
1846 }
1847#endif
1848 in6_ifa_put(ifp);
1849 addrconf_verify(0);
1850 }
1851 }
1852 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1853 in6_dev_put(in6_dev);
1854}
1855
1856/*
1857 * Set destination address.
1858 * Special case for SIT interfaces where we create a new "virtual"
1859 * device.
1860 */
1861int addrconf_set_dstaddr(void __user *arg)
1862{
1863 struct in6_ifreq ireq;
1864 struct net_device *dev;
1865 int err = -EINVAL;
1866
1867 rtnl_lock();
1868
1869 err = -EFAULT;
1870 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1871 goto err_exit;
1872
881d966b 1873 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1874
1875 err = -ENODEV;
1876 if (dev == NULL)
1877 goto err_exit;
1878
0be669bb 1879#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1880 if (dev->type == ARPHRD_SIT) {
1881 struct ifreq ifr;
1882 mm_segment_t oldfs;
1883 struct ip_tunnel_parm p;
1884
1885 err = -EADDRNOTAVAIL;
1886 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1887 goto err_exit;
1888
1889 memset(&p, 0, sizeof(p));
1890 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1891 p.iph.saddr = 0;
1892 p.iph.version = 4;
1893 p.iph.ihl = 5;
1894 p.iph.protocol = IPPROTO_IPV6;
1895 p.iph.ttl = 64;
1896 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1897
1898 oldfs = get_fs(); set_fs(KERNEL_DS);
1899 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1900 set_fs(oldfs);
1901
1902 if (err == 0) {
1903 err = -ENOBUFS;
881d966b 1904 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1905 goto err_exit;
1906 err = dev_open(dev);
1907 }
1908 }
0be669bb 1909#endif
1da177e4
LT		 1910
1911err_exit:
1912 rtnl_unlock();
1913 return err;
1914}
1915
1916/*
1917 * Manual configuration of address on an interface
1918 */
0778769d 1919static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1920 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1921{
1922 struct inet6_ifaddr *ifp;
1923 struct inet6_dev *idev;
1924 struct net_device *dev;
1925 int scope;
46d48046 1926 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1927
1928 ASSERT_RTNL();
1ab1457c 1929
0778769d
NT		 1930 /* check the lifetime */
1931 if (!valid_lft || prefered_lft > valid_lft)
1932 return -EINVAL;
1933
881d966b 1934 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1935 return -ENODEV;
1ab1457c 1936
1da177e4
LT		 1937 if ((idev = addrconf_add_dev(dev)) == NULL)
1938 return -ENOBUFS;
1939
1940 scope = ipv6_addr_scope(pfx);
1941
46d48046 1942 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1943 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1944 flags = 0;
1945 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1946 valid_lft = 0x7FFFFFFF/HZ;
1947
1948 if (prefered_lft == 0)
1949 ifa_flags |= IFA_F_DEPRECATED;
1950 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1951 (prefered_lft != INFINITY_LIFE_TIME))
1952 prefered_lft = 0x7FFFFFFF/HZ;
1953
1954 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1955
1da177e4 1956 if (!IS_ERR(ifp)) {
06aebfb7 1957 spin_lock_bh(&ifp->lock);
0778769d
NT		 1958 ifp->valid_lft = valid_lft;
1959 ifp->prefered_lft = prefered_lft;
1960 ifp->tstamp = jiffies;
06aebfb7 1961 spin_unlock_bh(&ifp->lock);
0778769d 1962
46d48046
YH		 1963 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1964 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1965 /*
1966 * Note that section 3.1 of RFC 4429 indicates
1967 * that the Optimistic flag should not be set for
1968 * manually configured addresses
1969 */
1da177e4
LT		 1970 addrconf_dad_start(ifp, 0);
1971 in6_ifa_put(ifp);
0778769d 1972 addrconf_verify(0);
1da177e4
LT		 1973 return 0;
1974 }
1975
1976 return PTR_ERR(ifp);
1977}
1978
1979static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1980{
1981 struct inet6_ifaddr *ifp;
1982 struct inet6_dev *idev;
1983 struct net_device *dev;
1ab1457c 1984
881d966b 1985 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1986 return -ENODEV;
1987
1988 if ((idev = __in6_dev_get(dev)) == NULL)
1989 return -ENXIO;
1990
1991 read_lock_bh(&idev->lock);
1992 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1993 if (ifp->prefix_len == plen &&
1994 ipv6_addr_equal(pfx, &ifp->addr)) {
1995 in6_ifa_hold(ifp);
1996 read_unlock_bh(&idev->lock);
1ab1457c 1997
1da177e4
LT		 1998 ipv6_del_addr(ifp);
1999
2000 /* If the last address is deleted administratively,
2001 disable IPv6 on this interface.
2002 */
2003 if (idev->addr_list == NULL)
2004 addrconf_ifdown(idev->dev, 1);
2005 return 0;
2006 }
2007 }
2008 read_unlock_bh(&idev->lock);
2009 return -EADDRNOTAVAIL;
2010}
2011
2012
2013int addrconf_add_ifaddr(void __user *arg)
2014{
2015 struct in6_ifreq ireq;
2016 int err;
1ab1457c 2017
1da177e4
LT		 2018 if (!capable(CAP_NET_ADMIN))
2019 return -EPERM;
1ab1457c 2020
1da177e4
LT		 2021 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2022 return -EFAULT;
2023
2024 rtnl_lock();
0778769d 2025 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2026 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2027 rtnl_unlock();
2028 return err;
2029}
2030
2031int addrconf_del_ifaddr(void __user *arg)
2032{
2033 struct in6_ifreq ireq;
2034 int err;
1ab1457c 2035
1da177e4
LT		 2036 if (!capable(CAP_NET_ADMIN))
2037 return -EPERM;
2038
2039 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2040 return -EFAULT;
2041
2042 rtnl_lock();
2043 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2044 rtnl_unlock();
2045 return err;
2046}
2047
0be669bb 2048#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2049static void sit_add_v4_addrs(struct inet6_dev *idev)
2050{
2051 struct inet6_ifaddr * ifp;
2052 struct in6_addr addr;
2053 struct net_device *dev;
2054 int scope;
2055
2056 ASSERT_RTNL();
2057
2058 memset(&addr, 0, sizeof(struct in6_addr));
2059 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2060
2061 if (idev->dev->flags&IFF_POINTOPOINT) {
2062 addr.s6_addr32[0] = htonl(0xfe800000);
2063 scope = IFA_LINK;
2064 } else {
2065 scope = IPV6_ADDR_COMPATv4;
2066 }
2067
2068 if (addr.s6_addr32[3]) {
2069 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2070 if (!IS_ERR(ifp)) {
2071 spin_lock_bh(&ifp->lock);
2072 ifp->flags &= ~IFA_F_TENTATIVE;
2073 spin_unlock_bh(&ifp->lock);
2074 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2075 in6_ifa_put(ifp);
2076 }
2077 return;
2078 }
2079
881d966b 2080 for_each_netdev(&init_net, dev) {
e5ed6399 2081 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2082 if (in_dev && (dev->flags & IFF_UP)) {
2083 struct in_ifaddr * ifa;
2084
2085 int flag = scope;
2086
2087 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2088 int plen;
2089
2090 addr.s6_addr32[3] = ifa->ifa_local;
2091
2092 if (ifa->ifa_scope == RT_SCOPE_LINK)
2093 continue;
2094 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2095 if (idev->dev->flags&IFF_POINTOPOINT)
2096 continue;
2097 flag |= IFA_HOST;
2098 }
2099 if (idev->dev->flags&IFF_POINTOPOINT)
2100 plen = 64;
2101 else
2102 plen = 96;
2103
2104 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2105 IFA_F_PERMANENT);
2106 if (!IS_ERR(ifp)) {
2107 spin_lock_bh(&ifp->lock);
2108 ifp->flags &= ~IFA_F_TENTATIVE;
2109 spin_unlock_bh(&ifp->lock);
2110 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2111 in6_ifa_put(ifp);
2112 }
2113 }
2114 }
1ab1457c 2115 }
1da177e4 2116}
0be669bb 2117#endif
1da177e4
LT		 2118
2119static void init_loopback(struct net_device *dev)
2120{
2121 struct inet6_dev *idev;
2122 struct inet6_ifaddr * ifp;
2123
2124 /* ::1 */
2125
2126 ASSERT_RTNL();
2127
2128 if ((idev = ipv6_find_idev(dev)) == NULL) {
2129 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2130 return;
2131 }
2132
2133 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2134 if (!IS_ERR(ifp)) {
2135 spin_lock_bh(&ifp->lock);
2136 ifp->flags &= ~IFA_F_TENTATIVE;
2137 spin_unlock_bh(&ifp->lock);
2138 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2139 in6_ifa_put(ifp);
2140 }
2141}
2142
2143static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2144{
2145 struct inet6_ifaddr * ifp;
95c385b4
NH		 2146 u32 addr_flags = IFA_F_PERMANENT;
2147
2148#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2149 if (idev->cnf.optimistic_dad &&
2150 !ipv6_devconf.forwarding)
2151 addr_flags |= IFA_F_OPTIMISTIC;
2152#endif
1da177e4 2153
95c385b4
NH		 2154
2155 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2156 if (!IS_ERR(ifp)) {
46d48046 2157 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2158 addrconf_dad_start(ifp, 0);
2159 in6_ifa_put(ifp);
2160 }
2161}
2162
2163static void addrconf_dev_config(struct net_device *dev)
2164{
2165 struct in6_addr addr;
2166 struct inet6_dev * idev;
2167
2168 ASSERT_RTNL();
2169
74235a25
HX		 2170 if ((dev->type != ARPHRD_ETHER) &&
2171 (dev->type != ARPHRD_FDDI) &&
2172 (dev->type != ARPHRD_IEEE802_TR) &&
2173 (dev->type != ARPHRD_ARCNET) &&
2174 (dev->type != ARPHRD_INFINIBAND)) {
2175 /* Alas, we support only Ethernet autoconfiguration. */
2176 return;
2177 }
2178
1da177e4
LT		 2179 idev = addrconf_add_dev(dev);
2180 if (idev == NULL)
2181 return;
2182
2183 memset(&addr, 0, sizeof(struct in6_addr));
2184 addr.s6_addr32[0] = htonl(0xFE800000);
2185
2186 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2187 addrconf_add_linklocal(idev, &addr);
2188}
2189
0be669bb 2190#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2191static void addrconf_sit_config(struct net_device *dev)
2192{
2193 struct inet6_dev *idev;
2194
2195 ASSERT_RTNL();
2196
1ab1457c
YH		 2197 /*
2198 * Configure the tunnel with one of our IPv4
2199 * addresses... we should configure all of
1da177e4
LT		 2200 * our v4 addrs in the tunnel
2201 */
2202
2203 if ((idev = ipv6_find_idev(dev)) == NULL) {
2204 printk(KERN_DEBUG "init sit: add_dev failed\n");
2205 return;
2206 }
2207
2208 sit_add_v4_addrs(idev);
2209
2210 if (dev->flags&IFF_POINTOPOINT) {
2211 addrconf_add_mroute(dev);
2212 addrconf_add_lroute(dev);
2213 } else
2214 sit_route_add(dev);
2215}
0be669bb 2216#endif
1da177e4
LT		 2217
2218static inline int
2219ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2220{
2221 struct in6_addr lladdr;
2222
95c385b4 2223 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2224 addrconf_add_linklocal(idev, &lladdr);
2225 return 0;
2226 }
2227 return -1;
2228}
2229
2230static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2231{
2232 struct net_device *link_dev;
2233
2234 /* first try to inherit the link-local address from the link device */
2235 if (idev->dev->iflink &&
881d966b 2236 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2237 if (!ipv6_inherit_linklocal(idev, link_dev))
2238 return;
2239 }
2240 /* then try to inherit it from any device */
881d966b 2241 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2242 if (!ipv6_inherit_linklocal(idev, link_dev))
2243 return;
2244 }
2245 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2246}
2247
2248/*
2249 * Autoconfigure tunnel with a link-local address so routing protocols,
2250 * DHCPv6, MLD etc. can be run over the virtual link
2251 */
2252
2253static void addrconf_ip6_tnl_config(struct net_device *dev)
2254{
2255 struct inet6_dev *idev;
2256
2257 ASSERT_RTNL();
2258
2259 if ((idev = addrconf_add_dev(dev)) == NULL) {
2260 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2261 return;
2262 }
2263 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2264}
2265
1ab1457c 2266static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2267 void * data)
2268{
2269 struct net_device *dev = (struct net_device *) data;
74235a25 2270 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2271 int run_pending = 0;
b217d616 2272 int err;
1da177e4 2273
e9dc8653
EB		 2274 if (dev->nd_net != &init_net)
2275 return NOTIFY_DONE;
2276
1da177e4 2277 switch(event) {
45ba9dd2 2278 case NETDEV_REGISTER:
74235a25 2279 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2280 idev = ipv6_add_dev(dev);
2281 if (!idev)
b217d616 2282 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2283 }
2284 break;
1da177e4 2285 case NETDEV_UP:
3c21edbd 2286 case NETDEV_CHANGE:
c2edacf8
JV		 2287 if (dev->flags & IFF_SLAVE)
2288 break;
2289
3c21edbd 2290 if (event == NETDEV_UP) {
f24e3d65 2291 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2292 /* device is not ready yet. */
2293 printk(KERN_INFO
2294 "ADDRCONF(NETDEV_UP): %s: "
2295 "link is not ready\n",
2296 dev->name);
2297 break;
2298 }
99081049 2299
d31c7b8f
EP		 2300 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2301 idev = ipv6_add_dev(dev);
2302
99081049
KS		 2303 if (idev)
2304 idev->if_flags |= IF_READY;
3c21edbd 2305 } else {
f24e3d65 2306 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2307 /* device is still not ready. */
2308 break;
2309 }
2310
2311 if (idev) {
2312 if (idev->if_flags & IF_READY) {
2313 /* device is already configured. */
2314 break;
2315 }
2316 idev->if_flags |= IF_READY;
2317 }
2318
2319 printk(KERN_INFO
2320 "ADDRCONF(NETDEV_CHANGE): %s: "
2321 "link becomes ready\n",
2322 dev->name);
2323
c5e33bdd 2324 run_pending = 1;
3c21edbd
YH		 2325 }
2326
1da177e4 2327 switch(dev->type) {
0be669bb 2328#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2329 case ARPHRD_SIT:
2330 addrconf_sit_config(dev);
2331 break;
0be669bb 2332#endif
1da177e4
LT		 2333 case ARPHRD_TUNNEL6:
2334 addrconf_ip6_tnl_config(dev);
2335 break;
2336 case ARPHRD_LOOPBACK:
2337 init_loopback(dev);
2338 break;
2339
2340 default:
2341 addrconf_dev_config(dev);
2342 break;
3ff50b79 2343 }
1da177e4 2344 if (idev) {
c5e33bdd
YH		 2345 if (run_pending)
2346 addrconf_dad_run(idev);
2347
1da177e4
LT		 2348 /* If the MTU changed during the interface down, when the
2349 interface up, the changed MTU must be reflected in the
2350 idev as well as routers.
2351 */
2352 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2353 rt6_mtu_change(dev, dev->mtu);
2354 idev->cnf.mtu6 = dev->mtu;
2355 }
2356 idev->tstamp = jiffies;
2357 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2358 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2359 stop IPv6 on this interface.
2360 */
2361 if (dev->mtu < IPV6_MIN_MTU)
2362 addrconf_ifdown(dev, event != NETDEV_DOWN);
2363 }
2364 break;
2365
2366 case NETDEV_CHANGEMTU:
d31c7b8f 2367 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2368 rt6_mtu_change(dev, dev->mtu);
2369 idev->cnf.mtu6 = dev->mtu;
2370 break;
2371 }
2372
d31c7b8f
EP		 2373 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2374 idev = ipv6_add_dev(dev);
2375 if (idev)
2376 break;
2377 }
2378
1da177e4
LT		 2379 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2380
2381 case NETDEV_DOWN:
2382 case NETDEV_UNREGISTER:
2383 /*
2384 * Remove all addresses from this interface.
2385 */
2386 addrconf_ifdown(dev, event != NETDEV_DOWN);
2387 break;
3c21edbd 2388
1da177e4 2389 case NETDEV_CHANGENAME:
1da177e4 2390 if (idev) {
5632c515
SH		 2391 snmp6_unregister_dev(idev);
2392#ifdef CONFIG_SYSCTL
1da177e4
LT		 2393 addrconf_sysctl_unregister(&idev->cnf);
2394 neigh_sysctl_unregister(idev->nd_parms);
2395 neigh_sysctl_register(dev, idev->nd_parms,
2396 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2397 &ndisc_ifinfo_sysctl_change,
2398 NULL);
2399 addrconf_sysctl_register(idev, &idev->cnf);
1da177e4 2400#endif
b217d616
HX		 2401 err = snmp6_register_dev(idev);
2402 if (err)
2403 return notifier_from_errno(err);
5632c515 2404 }
1da177e4 2405 break;
3ff50b79 2406 }
1da177e4
LT		 2407
2408 return NOTIFY_OK;
2409}
2410
2411/*
2412 * addrconf module should be notified of a device going up
2413 */
2414static struct notifier_block ipv6_dev_notf = {
2415 .notifier_call = addrconf_notify,
2416 .priority = 0
2417};
2418
2419static int addrconf_ifdown(struct net_device *dev, int how)
2420{
2421 struct inet6_dev *idev;
2422 struct inet6_ifaddr *ifa, **bifa;
2423 int i;
2424
2425 ASSERT_RTNL();
2426
2774c7ab 2427 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2428 how = 0;
2429
2430 rt6_ifdown(dev);
2431 neigh_ifdown(&nd_tbl, dev);
2432
2433 idev = __in6_dev_get(dev);
2434 if (idev == NULL)
2435 return -ENODEV;
2436
2437 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2438 Do not dev_put!
1da177e4
LT		 2439 */
2440 if (how == 1) {
1da177e4 2441 idev->dead = 1;
8814c4b5
YH		 2442
2443 /* protected by rtnl_lock */
2444 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2445
2446 /* Step 1.5: remove snmp6 entry */
2447 snmp6_unregister_dev(idev);
2448
2449 }
2450
2451 /* Step 2: clear hash table */
2452 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2453 bifa = &inet6_addr_lst[i];
2454
2455 write_lock_bh(&addrconf_hash_lock);
2456 while ((ifa = *bifa) != NULL) {
2457 if (ifa->idev == idev) {
2458 *bifa = ifa->lst_next;
2459 ifa->lst_next = NULL;
2460 addrconf_del_timer(ifa);
2461 in6_ifa_put(ifa);
2462 continue;
2463 }
2464 bifa = &ifa->lst_next;
2465 }
2466 write_unlock_bh(&addrconf_hash_lock);
2467 }
2468
2469 write_lock_bh(&idev->lock);
2470
2471 /* Step 3: clear flags for stateless addrconf */
2472 if (how != 1)
3c21edbd 2473 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2474
2475 /* Step 4: clear address list */
2476#ifdef CONFIG_IPV6_PRIVACY
2477 if (how == 1 && del_timer(&idev->regen_timer))
2478 in6_dev_put(idev);
2479
2480 /* clear tempaddr list */
2481 while ((ifa = idev->tempaddr_list) != NULL) {
2482 idev->tempaddr_list = ifa->tmp_next;
2483 ifa->tmp_next = NULL;
2484 ifa->dead = 1;
2485 write_unlock_bh(&idev->lock);
2486 spin_lock_bh(&ifa->lock);
2487
2488 if (ifa->ifpub) {
2489 in6_ifa_put(ifa->ifpub);
2490 ifa->ifpub = NULL;
2491 }
2492 spin_unlock_bh(&ifa->lock);
2493 in6_ifa_put(ifa);
2494 write_lock_bh(&idev->lock);
2495 }
2496#endif
2497 while ((ifa = idev->addr_list) != NULL) {
2498 idev->addr_list = ifa->if_next;
2499 ifa->if_next = NULL;
2500 ifa->dead = 1;
2501 addrconf_del_timer(ifa);
2502 write_unlock_bh(&idev->lock);
2503
2504 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2505 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2506 in6_ifa_put(ifa);
2507
2508 write_lock_bh(&idev->lock);
2509 }
2510 write_unlock_bh(&idev->lock);
2511
2512 /* Step 5: Discard multicast list */
2513
2514 if (how == 1)
2515 ipv6_mc_destroy_dev(idev);
2516 else
2517 ipv6_mc_down(idev);
2518
1da177e4 2519 idev->tstamp = jiffies;
1ab1457c 2520
1da177e4
LT		 2521 /* Shot the device (if unregistered) */
2522
2523 if (how == 1) {
2524#ifdef CONFIG_SYSCTL
2525 addrconf_sysctl_unregister(&idev->cnf);
2526 neigh_sysctl_unregister(idev->nd_parms);
2527#endif
2528 neigh_parms_release(&nd_tbl, idev->nd_parms);
2529 neigh_ifdown(&nd_tbl, dev);
2530 in6_dev_put(idev);
2531 }
2532 return 0;
2533}
2534
2535static void addrconf_rs_timer(unsigned long data)
2536{
2537 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2538
2539 if (ifp->idev->cnf.forwarding)
2540 goto out;
2541
2542 if (ifp->idev->if_flags & IF_RA_RCVD) {
2543 /*
2544 * Announcement received after solicitation
2545 * was sent
2546 */
2547 goto out;
2548 }
2549
2550 spin_lock(&ifp->lock);
2551 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2552 struct in6_addr all_routers;
2553
2554 /* The wait after the last probe can be shorter */
2555 addrconf_mod_timer(ifp, AC_RS,
2556 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2557 ifp->idev->cnf.rtr_solicit_delay :
2558 ifp->idev->cnf.rtr_solicit_interval);
2559 spin_unlock(&ifp->lock);
2560
2561 ipv6_addr_all_routers(&all_routers);
2562
2563 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2564 } else {
2565 spin_unlock(&ifp->lock);
2566 /*
2567 * Note: we do not support deprecated "all on-link"
2568 * assumption any longer.
2569 */
2570 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2571 ifp->idev->dev->name);
2572 }
2573
2574out:
2575 in6_ifa_put(ifp);
2576}
2577
2578/*
2579 * Duplicate Address Detection
2580 */
3c21edbd
YH		 2581static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2582{
2583 unsigned long rand_num;
2584 struct inet6_dev *idev = ifp->idev;
2585
95c385b4
NH		 2586 if (ifp->flags & IFA_F_OPTIMISTIC)
2587 rand_num = 0;
2588 else
2589 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2590
3c21edbd
YH		 2591 ifp->probes = idev->cnf.dad_transmits;
2592 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2593}
2594
e431b8c0 2595static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2596{
2597 struct inet6_dev *idev = ifp->idev;
2598 struct net_device *dev = idev->dev;
1da177e4
LT		 2599
2600 addrconf_join_solict(dev, &ifp->addr);
2601
1da177e4 2602 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2603
2604 read_lock_bh(&idev->lock);
2605 if (ifp->dead)
2606 goto out;
2607 spin_lock_bh(&ifp->lock);
2608
2609 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2610 !(ifp->flags&IFA_F_TENTATIVE) ||
2611 ifp->flags & IFA_F_NODAD) {
95c385b4 2612 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2613 spin_unlock_bh(&ifp->lock);
2614 read_unlock_bh(&idev->lock);
2615
2616 addrconf_dad_completed(ifp);
2617 return;
2618 }
2619
6732bade 2620 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2621 spin_unlock_bh(&ifp->lock);
6732bade 2622 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2623 /*
2624 * If the defice is not ready:
2625 * - keep it tentative if it is a permanent address.
2626 * - otherwise, kill it.
2627 */
2628 in6_ifa_hold(ifp);
2629 addrconf_dad_stop(ifp);
6732bade 2630 return;
3c21edbd 2631 }
95c385b4
NH		 2632
2633 /*
2634 * Optimistic nodes can start receiving
2635 * Frames right away
2636 */
2637 if(ifp->flags & IFA_F_OPTIMISTIC)
2638 ip6_ins_rt(ifp->rt);
2639
6732bade
YH		 2640 addrconf_dad_kick(ifp);
2641 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2642out:
2643 read_unlock_bh(&idev->lock);
2644}
2645
2646static void addrconf_dad_timer(unsigned long data)
2647{
2648 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2649 struct inet6_dev *idev = ifp->idev;
2650 struct in6_addr unspec;
2651 struct in6_addr mcaddr;
2652
2653 read_lock_bh(&idev->lock);
2654 if (idev->dead) {
2655 read_unlock_bh(&idev->lock);
2656 goto out;
2657 }
2658 spin_lock_bh(&ifp->lock);
2659 if (ifp->probes == 0) {
2660 /*
2661 * DAD was successful
2662 */
2663
95c385b4 2664 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2665 spin_unlock_bh(&ifp->lock);
2666 read_unlock_bh(&idev->lock);
2667
2668 addrconf_dad_completed(ifp);
2669
2670 goto out;
2671 }
2672
2673 ifp->probes--;
2674 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2675 spin_unlock_bh(&ifp->lock);
2676 read_unlock_bh(&idev->lock);
2677
2678 /* send a neighbour solicitation for our addr */
2679 memset(&unspec, 0, sizeof(unspec));
2680 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2681 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2682out:
2683 in6_ifa_put(ifp);
2684}
2685
2686static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2687{
2688 struct net_device * dev = ifp->idev->dev;
2689
2690 /*
2691 * Configure the address for reception. Now it is valid.
2692 */
2693
2694 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2695
2696 /* If added prefix is link local and forwarding is off,
2697 start sending router solicitations.
2698 */
2699
2700 if (ifp->idev->cnf.forwarding == 0 &&
2701 ifp->idev->cnf.rtr_solicits > 0 &&
2702 (dev->flags&IFF_LOOPBACK) == 0 &&
2703 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2704 struct in6_addr all_routers;
2705
2706 ipv6_addr_all_routers(&all_routers);
2707
2708 /*
2709 * If a host as already performed a random delay
2710 * [...] as part of DAD [...] there is no need
2711 * to delay again before sending the first RS
2712 */
2713 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2714
2715 spin_lock_bh(&ifp->lock);
2716 ifp->probes = 1;
2717 ifp->idev->if_flags |= IF_RS_SENT;
2718 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2719 spin_unlock_bh(&ifp->lock);
2720 }
2721}
2722
c5e33bdd
YH		 2723static void addrconf_dad_run(struct inet6_dev *idev) {
2724 struct inet6_ifaddr *ifp;
2725
2726 read_lock_bh(&idev->lock);
2727 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2728 spin_lock_bh(&ifp->lock);
2729 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2730 spin_unlock_bh(&ifp->lock);
2731 continue;
2732 }
2733 spin_unlock_bh(&ifp->lock);
2734 addrconf_dad_kick(ifp);
2735 }
2736 read_unlock_bh(&idev->lock);
2737}
2738
1da177e4
LT		 2739#ifdef CONFIG_PROC_FS
2740struct if6_iter_state {
2741 int bucket;
2742};
2743
2744static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2745{
2746 struct inet6_ifaddr *ifa = NULL;
2747 struct if6_iter_state *state = seq->private;
2748
2749 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2750 ifa = inet6_addr_lst[state->bucket];
2751 if (ifa)
2752 break;
2753 }
2754 return ifa;
2755}
2756
2757static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2758{
2759 struct if6_iter_state *state = seq->private;
2760
2761 ifa = ifa->lst_next;
2762try_again:
2763 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2764 ifa = inet6_addr_lst[state->bucket];
2765 goto try_again;
2766 }
2767 return ifa;
2768}
2769
2770static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2771{
2772 struct inet6_ifaddr *ifa = if6_get_first(seq);
2773
2774 if (ifa)
2775 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2776 --pos;
2777 return pos ? NULL : ifa;
2778}
2779
2780static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2781{
2782 read_lock_bh(&addrconf_hash_lock);
2783 return if6_get_idx(seq, *pos);
2784}
2785
2786static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2787{
2788 struct inet6_ifaddr *ifa;
2789
2790 ifa = if6_get_next(seq, v);
2791 ++*pos;
2792 return ifa;
2793}
2794
2795static void if6_seq_stop(struct seq_file *seq, void *v)
2796{
2797 read_unlock_bh(&addrconf_hash_lock);
2798}
2799
2800static int if6_seq_show(struct seq_file *seq, void *v)
2801{
2802 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2803 seq_printf(seq,
9343e79a 2804 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2805 NIP6(ifp->addr),
2806 ifp->idev->dev->ifindex,
2807 ifp->prefix_len,
2808 ifp->scope,
2809 ifp->flags,
2810 ifp->idev->dev->name);
2811 return 0;
2812}
2813
56b3d975 2814static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2815 .start = if6_seq_start,
2816 .next = if6_seq_next,
2817 .show = if6_seq_show,
2818 .stop = if6_seq_stop,
2819};
2820
2821static int if6_seq_open(struct inode *inode, struct file *file)
2822{
cf7732e4
PE		 2823 return seq_open_private(file, &if6_seq_ops,
2824 sizeof(struct if6_iter_state));
1da177e4
LT		 2825}
2826
9a32144e 2827static const struct file_operations if6_fops = {
1da177e4
LT		 2828 .owner = THIS_MODULE,
2829 .open = if6_seq_open,
2830 .read = seq_read,
2831 .llseek = seq_lseek,
2832 .release = seq_release_private,
2833};
2834
2835int __init if6_proc_init(void)
2836{
457c4cbc 2837 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2838 return -ENOMEM;
2839 return 0;
2840}
2841
2842void if6_proc_exit(void)
2843{
457c4cbc 2844 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2845}
2846#endif /* CONFIG_PROC_FS */
2847
59fbb3a6 2848#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2849/* Check if address is a home address configured on any interface. */
2850int ipv6_chk_home_addr(struct in6_addr *addr)
2851{
2852 int ret = 0;
2853 struct inet6_ifaddr * ifp;
2854 u8 hash = ipv6_addr_hash(addr);
2855 read_lock_bh(&addrconf_hash_lock);
2856 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2857 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2858 (ifp->flags & IFA_F_HOMEADDRESS)) {
2859 ret = 1;
2860 break;
2861 }
2862 }
2863 read_unlock_bh(&addrconf_hash_lock);
2864 return ret;
2865}
2866#endif
2867
1da177e4
LT		 2868/*
2869 * Periodic address status verification
2870 */
2871
2872static void addrconf_verify(unsigned long foo)
2873{
2874 struct inet6_ifaddr *ifp;
2875 unsigned long now, next;
2876 int i;
2877
2878 spin_lock_bh(&addrconf_verify_lock);
2879 now = jiffies;
2880 next = now + ADDR_CHECK_FREQUENCY;
2881
2882 del_timer(&addr_chk_timer);
2883
2884 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2885
2886restart:
5d5780df 2887 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2888 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2889 unsigned long age;
2890#ifdef CONFIG_IPV6_PRIVACY
2891 unsigned long regen_advance;
2892#endif
2893
2894 if (ifp->flags & IFA_F_PERMANENT)
2895 continue;
2896
2897 spin_lock(&ifp->lock);
2898 age = (now - ifp->tstamp) / HZ;
2899
2900#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2901 regen_advance = ifp->idev->cnf.regen_max_retry *
2902 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2903 ifp->idev->nd_parms->retrans_time / HZ;
2904#endif
2905
8f27ebb9
YH		 2906 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2907 age >= ifp->valid_lft) {
1da177e4
LT		 2908 spin_unlock(&ifp->lock);
2909 in6_ifa_hold(ifp);
5d5780df 2910 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2911 ipv6_del_addr(ifp);
2912 goto restart;
8f27ebb9
YH		 2913 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2914 spin_unlock(&ifp->lock);
2915 continue;
1da177e4
LT		 2916 } else if (age >= ifp->prefered_lft) {
2917 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2918 int deprecate = 0;
2919
2920 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2921 deprecate = 1;
2922 ifp->flags |= IFA_F_DEPRECATED;
2923 }
2924
2925 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2926 next = ifp->tstamp + ifp->valid_lft * HZ;
2927
2928 spin_unlock(&ifp->lock);
2929
2930 if (deprecate) {
2931 in6_ifa_hold(ifp);
5d5780df 2932 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2933
2934 ipv6_ifa_notify(0, ifp);
2935 in6_ifa_put(ifp);
2936 goto restart;
2937 }
2938#ifdef CONFIG_IPV6_PRIVACY
2939 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2940 !(ifp->flags&IFA_F_TENTATIVE)) {
2941 if (age >= ifp->prefered_lft - regen_advance) {
2942 struct inet6_ifaddr *ifpub = ifp->ifpub;
2943 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2944 next = ifp->tstamp + ifp->prefered_lft * HZ;
2945 if (!ifp->regen_count && ifpub) {
2946 ifp->regen_count++;
2947 in6_ifa_hold(ifp);
2948 in6_ifa_hold(ifpub);
2949 spin_unlock(&ifp->lock);
5d5780df 2950 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2951 spin_lock(&ifpub->lock);
2952 ifpub->regen_count = 0;
2953 spin_unlock(&ifpub->lock);
1da177e4
LT		 2954 ipv6_create_tempaddr(ifpub, ifp);
2955 in6_ifa_put(ifpub);
2956 in6_ifa_put(ifp);
2957 goto restart;
2958 }
2959 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2960 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2961 spin_unlock(&ifp->lock);
2962#endif
2963 } else {
2964 /* ifp->prefered_lft <= ifp->valid_lft */
2965 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2966 next = ifp->tstamp + ifp->prefered_lft * HZ;
2967 spin_unlock(&ifp->lock);
2968 }
2969 }
5d5780df 2970 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2971 }
2972
2973 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2974 add_timer(&addr_chk_timer);
2975 spin_unlock_bh(&addrconf_verify_lock);
2976}
2977
461d8837
TG		 2978static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2979{
2980 struct in6_addr *pfx = NULL;
2981
2982 if (addr)
2983 pfx = nla_data(addr);
2984
2985 if (local) {
2986 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2987 pfx = NULL;
2988 else
2989 pfx = nla_data(local);
2990 }
2991
2992 return pfx;
2993}
2994
ef7c79ed 2995static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2996 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2997 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2998 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2999};
3000
1da177e4
LT		 3001static int
3002inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3003{
b933f716
TG		 3004 struct ifaddrmsg *ifm;
3005 struct nlattr *tb[IFA_MAX+1];
1da177e4 3006 struct in6_addr *pfx;
b933f716 3007 int err;
1da177e4 3008
b933f716
TG		 3009 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3010 if (err < 0)
3011 return err;
3012
3013 ifm = nlmsg_data(nlh);
3014 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3015 if (pfx == NULL)
3016 return -EINVAL;
3017
3018 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3019}
3020
55ebaef1
NT		 3021static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3022 u32 prefered_lft, u32 valid_lft)
081bba5b 3023{
46d48046
YH		 3024 u32 flags = RTF_EXPIRES;
3025
081bba5b
NT		 3026 if (!valid_lft || (prefered_lft > valid_lft))
3027 return -EINVAL;
3028
46d48046 3029 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3030 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3031 flags = 0;
3032 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3033 valid_lft = 0x7FFFFFFF/HZ;
3034
3035 if (prefered_lft == 0)
55ebaef1 3036 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3037 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3038 (prefered_lft != INFINITY_LIFE_TIME))
3039 prefered_lft = 0x7FFFFFFF/HZ;
3040
3041 spin_lock_bh(&ifp->lock);
3b9f9a1c 3042 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3043 ifp->tstamp = jiffies;
3044 ifp->valid_lft = valid_lft;
3045 ifp->prefered_lft = prefered_lft;
3046
3047 spin_unlock_bh(&ifp->lock);
3048 if (!(ifp->flags&IFA_F_TENTATIVE))
3049 ipv6_ifa_notify(0, ifp);
081bba5b 3050
46d48046
YH		 3051 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3052 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3053 addrconf_verify(0);
3054
3055 return 0;
3056}
3057
1da177e4
LT		 3058static int
3059inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3060{
461d8837
TG		 3061 struct ifaddrmsg *ifm;
3062 struct nlattr *tb[IFA_MAX+1];
1da177e4 3063 struct in6_addr *pfx;
7198f8ce
TG		 3064 struct inet6_ifaddr *ifa;
3065 struct net_device *dev;
55ebaef1
NT		 3066 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3067 u8 ifa_flags;
461d8837 3068 int err;
1da177e4 3069
461d8837
TG		 3070 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3071 if (err < 0)
3072 return err;
3073
3074 ifm = nlmsg_data(nlh);
3075 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3076 if (pfx == NULL)
3077 return -EINVAL;
3078
461d8837 3079 if (tb[IFA_CACHEINFO]) {
0778769d 3080 struct ifa_cacheinfo *ci;
461d8837
TG		 3081
3082 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3083 valid_lft = ci->ifa_valid;
461d8837
TG		 3084 preferred_lft = ci->ifa_prefered;
3085 } else {
3086 preferred_lft = INFINITY_LIFE_TIME;
3087 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3088 }
3089
881d966b 3090 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3091 if (dev == NULL)
3092 return -ENODEV;
3093
55ebaef1 3094 /* We ignore other flags so far. */
3b9f9a1c 3095 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3096
7198f8ce
TG		 3097 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3098 if (ifa == NULL) {
3099 /*
3100 * It would be best to check for !NLM_F_CREATE here but
3101 * userspace alreay relies on not having to provide this.
3102 */
3103 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3104 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3105 }
3106
7198f8ce
TG		 3107 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3108 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3109 err = -EEXIST;
3110 else
55ebaef1 3111 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3112
3113 in6_ifa_put(ifa);
3114
3115 return err;
1da177e4
LT		 3116}
3117
101bb229
TG		 3118static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3119 u8 scope, int ifindex)
3120{
3121 struct ifaddrmsg *ifm;
3122
3123 ifm = nlmsg_data(nlh);
3124 ifm->ifa_family = AF_INET6;
3125 ifm->ifa_prefixlen = prefixlen;
3126 ifm->ifa_flags = flags;
3127 ifm->ifa_scope = scope;
3128 ifm->ifa_index = ifindex;
3129}
3130
85486af0
TG		 3131static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3132 unsigned long tstamp, u32 preferred, u32 valid)
3133{
3134 struct ifa_cacheinfo ci;
3135
3136 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3137 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3138 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3139 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3140 ci.ifa_prefered = preferred;
3141 ci.ifa_valid = valid;
3142
3143 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3144}
3145
101bb229
TG		 3146static inline int rt_scope(int ifa_scope)
3147{
3148 if (ifa_scope & IFA_HOST)
3149 return RT_SCOPE_HOST;
3150 else if (ifa_scope & IFA_LINK)
3151 return RT_SCOPE_LINK;
3152 else if (ifa_scope & IFA_SITE)
3153 return RT_SCOPE_SITE;
3154 else
3155 return RT_SCOPE_UNIVERSE;
3156}
3157
0ab6803b
TG		 3158static inline int inet6_ifaddr_msgsize(void)
3159{
339bf98f
TG		 3160 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3161 + nla_total_size(16) /* IFA_ADDRESS */
3162 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3163}
c5396a31 3164
1da177e4 3165static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3166 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3167{
1da177e4 3168 struct nlmsghdr *nlh;
85486af0 3169 u32 preferred, valid;
1da177e4 3170
0ab6803b
TG		 3171 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3172 if (nlh == NULL)
26932566 3173 return -EMSGSIZE;
0ab6803b 3174
101bb229
TG		 3175 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3176 ifa->idev->dev->ifindex);
3177
1da177e4 3178 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3179 preferred = ifa->prefered_lft;
3180 valid = ifa->valid_lft;
3181 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3182 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3183 preferred -= tval;
3184 if (valid != INFINITY_LIFE_TIME)
3185 valid -= tval;
1da177e4
LT		 3186 }
3187 } else {
85486af0
TG		 3188 preferred = INFINITY_LIFE_TIME;
3189 valid = INFINITY_LIFE_TIME;
3190 }
3191
0ab6803b 3192 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3193 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3194 nlmsg_cancel(skb, nlh);
3195 return -EMSGSIZE;
3196 }
1da177e4 3197
0ab6803b 3198 return nlmsg_end(skb, nlh);
1da177e4
LT		 3199}
3200
3201static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3202 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3203{
1da177e4 3204 struct nlmsghdr *nlh;
101bb229
TG		 3205 u8 scope = RT_SCOPE_UNIVERSE;
3206 int ifindex = ifmca->idev->dev->ifindex;
3207
3208 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3209 scope = RT_SCOPE_SITE;
1da177e4 3210
0ab6803b
TG		 3211 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3212 if (nlh == NULL)
26932566 3213 return -EMSGSIZE;
85486af0 3214
0ab6803b
TG		 3215 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3216 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3217 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3218 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3219 nlmsg_cancel(skb, nlh);
3220 return -EMSGSIZE;
3221 }
85486af0 3222
0ab6803b 3223 return nlmsg_end(skb, nlh);
1da177e4
LT		 3224}
3225
3226static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3227 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3228{
1da177e4 3229 struct nlmsghdr *nlh;
101bb229
TG		 3230 u8 scope = RT_SCOPE_UNIVERSE;
3231 int ifindex = ifaca->aca_idev->dev->ifindex;
3232
3233 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3234 scope = RT_SCOPE_SITE;
1da177e4 3235
0ab6803b
TG		 3236 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3237 if (nlh == NULL)
26932566 3238 return -EMSGSIZE;
85486af0 3239
0ab6803b
TG		 3240 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3241 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3242 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3243 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3244 nlmsg_cancel(skb, nlh);
3245 return -EMSGSIZE;
3246 }
1da177e4 3247
0ab6803b 3248 return nlmsg_end(skb, nlh);
1da177e4
LT		 3249}
3250
3251enum addr_type_t
3252{
3253 UNICAST_ADDR,
3254 MULTICAST_ADDR,
3255 ANYCAST_ADDR,
3256};
3257
3258static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3259 enum addr_type_t type)
3260{
3261 int idx, ip_idx;
3262 int s_idx, s_ip_idx;
3263 int err = 1;
3264 struct net_device *dev;
3265 struct inet6_dev *idev = NULL;
3266 struct inet6_ifaddr *ifa;
3267 struct ifmcaddr6 *ifmca;
3268 struct ifacaddr6 *ifaca;
3269
3270 s_idx = cb->args[0];
3271 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3272
7562f876 3273 idx = 0;
881d966b 3274 for_each_netdev(&init_net, dev) {
1da177e4 3275 if (idx < s_idx)
7562f876 3276 goto cont;
1da177e4
LT		 3277 if (idx > s_idx)
3278 s_ip_idx = 0;
3279 ip_idx = 0;
3280 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3281 goto cont;
1da177e4
LT		 3282 read_lock_bh(&idev->lock);
3283 switch (type) {
3284 case UNICAST_ADDR:
ae9cda5d 3285 /* unicast address incl. temp addr */
1da177e4
LT		 3286 for (ifa = idev->addr_list; ifa;
3287 ifa = ifa->if_next, ip_idx++) {
3288 if (ip_idx < s_ip_idx)
3289 continue;
1ab1457c
YH		 3290 if ((err = inet6_fill_ifaddr(skb, ifa,
3291 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3292 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3293 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3294 goto done;
3295 }
1da177e4
LT		 3296 break;
3297 case MULTICAST_ADDR:
3298 /* multicast address */
1ab1457c 3299 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3300 ifmca = ifmca->next, ip_idx++) {
3301 if (ip_idx < s_ip_idx)
3302 continue;
1ab1457c
YH		 3303 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3304 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3305 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3306 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3307 goto done;
3308 }
3309 break;
3310 case ANYCAST_ADDR:
3311 /* anycast address */
3312 for (ifaca = idev->ac_list; ifaca;
3313 ifaca = ifaca->aca_next, ip_idx++) {
3314 if (ip_idx < s_ip_idx)
3315 continue;
1ab1457c
YH		 3316 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3317 NETLINK_CB(cb->skb).pid,
b6544c0b 3318 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3319 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3320 goto done;
3321 }
3322 break;
3323 default:
3324 break;
3325 }
3326 read_unlock_bh(&idev->lock);
3327 in6_dev_put(idev);
7562f876
PE		 3328cont:
3329 idx++;
1da177e4
LT		 3330 }
3331done:
3332 if (err <= 0) {
3333 read_unlock_bh(&idev->lock);
3334 in6_dev_put(idev);
3335 }
1da177e4
LT		 3336 cb->args[0] = idx;
3337 cb->args[1] = ip_idx;
3338 return skb->len;
3339}
3340
3341static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3342{
3343 enum addr_type_t type = UNICAST_ADDR;
3344 return inet6_dump_addr(skb, cb, type);
3345}
3346
3347static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3348{
3349 enum addr_type_t type = MULTICAST_ADDR;
3350 return inet6_dump_addr(skb, cb, type);
3351}
3352
3353
3354static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3355{
3356 enum addr_type_t type = ANYCAST_ADDR;
3357 return inet6_dump_addr(skb, cb, type);
3358}
3359
1b29fc2c
TG		 3360static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3361 void *arg)
6c223828 3362{
1b29fc2c
TG		 3363 struct ifaddrmsg *ifm;
3364 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3365 struct in6_addr *addr = NULL;
3366 struct net_device *dev = NULL;
3367 struct inet6_ifaddr *ifa;
3368 struct sk_buff *skb;
6c223828
NT		 3369 int err;
3370
1b29fc2c
TG		 3371 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3372 if (err < 0)
3373 goto errout;
3374
3375 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3376 if (addr == NULL) {
3377 err = -EINVAL;
3378 goto errout;
6c223828 3379 }
6c223828 3380
1b29fc2c 3381 ifm = nlmsg_data(nlh);
6c223828 3382 if (ifm->ifa_index)
881d966b 3383 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3384
1b29fc2c
TG		 3385 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3386 err = -EADDRNOTAVAIL;
3387 goto errout;
3388 }
6c223828 3389
0ab6803b 3390 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3391 err = -ENOBUFS;
1b29fc2c 3392 goto errout_ifa;
6c223828
NT		 3393 }
3394
6c223828
NT		 3395 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3396 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3397 if (err < 0) {
3398 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3399 WARN_ON(err == -EMSGSIZE);
3400 kfree_skb(skb);
3401 goto errout_ifa;
3402 }
2942e900 3403 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3404errout_ifa:
6c223828 3405 in6_ifa_put(ifa);
1b29fc2c 3406errout:
6c223828 3407 return err;
6c223828
NT		 3408}
3409
1da177e4
LT		 3410static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3411{
3412 struct sk_buff *skb;
5d620266 3413 int err = -ENOBUFS;
1da177e4 3414
0ab6803b 3415 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3416 if (skb == NULL)
3417 goto errout;
3418
3419 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3420 if (err < 0) {
3421 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3422 WARN_ON(err == -EMSGSIZE);
3423 kfree_skb(skb);
3424 goto errout;
3425 }
5d620266
TG		 3426 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3427errout:
3428 if (err < 0)
3429 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3430}
3431
b6f99a21 3432static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3433 __s32 *array, int bytes)
3434{
04561c1f
TG		 3435 BUG_ON(bytes < (DEVCONF_MAX * 4));
3436
1da177e4
LT		 3437 memset(array, 0, bytes);
3438 array[DEVCONF_FORWARDING] = cnf->forwarding;
3439 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3440 array[DEVCONF_MTU6] = cnf->mtu6;
3441 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3442 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3443 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3444 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3445 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3446 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3447 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3448 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3449#ifdef CONFIG_IPV6_PRIVACY
3450 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3451 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3452 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3453 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3454 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3455#endif
3456 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3457 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3458 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3459#ifdef CONFIG_IPV6_ROUTER_PREF
3460 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3461 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3462#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3463 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3464#endif
930d6ff2 3465#endif
fbea49e1 3466 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3467 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3468#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3469 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3470#endif
1da177e4
LT		 3471}
3472
339bf98f
TG		 3473static inline size_t inet6_if_nlmsg_size(void)
3474{
3475 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3476 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3477 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3478 + nla_total_size(4) /* IFLA_MTU */
3479 + nla_total_size(4) /* IFLA_LINK */
3480 + nla_total_size( /* IFLA_PROTINFO */
3481 nla_total_size(4) /* IFLA_INET6_FLAGS */
3482 + nla_total_size(sizeof(struct ifla_cacheinfo))
3483 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3484 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3485 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3486 );
3487}
c5396a31 3488
7f7d9a6b
HX		 3489static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3490 int bytes)
3491{
3492 int i;
3493 int pad = bytes - sizeof(u64) * items;
3494 BUG_ON(pad < 0);
3495
3496 /* Use put_unaligned() because stats may not be aligned for u64. */
3497 put_unaligned(items, &stats[0]);
3498 for (i = 1; i < items; i++)
3499 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3500
3501 memset(&stats[items], 0, pad);
3502}
3503
3504static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3505 int bytes)
3506{
3507 switch(attrtype) {
3508 case IFLA_INET6_STATS:
3509 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3510 break;
3511 case IFLA_INET6_ICMP6STATS:
3512 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3513 break;
3514 }
3515}
3516
1ab1457c 3517static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3518 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3519{
04561c1f 3520 struct net_device *dev = idev->dev;
bf99f1bd 3521 struct nlattr *nla;
04561c1f
TG		 3522 struct ifinfomsg *hdr;
3523 struct nlmsghdr *nlh;
3524 void *protoinfo;
3525 struct ifla_cacheinfo ci;
3526
3527 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3528 if (nlh == NULL)
26932566 3529 return -EMSGSIZE;
04561c1f
TG		 3530
3531 hdr = nlmsg_data(nlh);
3532 hdr->ifi_family = AF_INET6;
3533 hdr->__ifi_pad = 0;
3534 hdr->ifi_type = dev->type;
3535 hdr->ifi_index = dev->ifindex;
3536 hdr->ifi_flags = dev_get_flags(dev);
3537 hdr->ifi_change = 0;
3538
3539 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3540
3541 if (dev->addr_len)
04561c1f 3542 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3543
04561c1f 3544 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3545 if (dev->ifindex != dev->iflink)
04561c1f 3546 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3547
04561c1f
TG		 3548 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3549 if (protoinfo == NULL)
3550 goto nla_put_failure;
1da177e4 3551
04561c1f 3552 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3553
1da177e4
LT		 3554 ci.max_reasm_len = IPV6_MAXPLEN;
3555 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3556 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3557 ci.reachable_time = idev->nd_parms->reachable_time;
3558 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3559 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3560
bf99f1bd
YH		 3561 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3562 if (nla == NULL)
04561c1f 3563 goto nla_put_failure;
bf99f1bd 3564 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3565
bf99f1bd
YH		 3566 /* XXX - MC not implemented */
3567
3568 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3569 if (nla == NULL)
3570 goto nla_put_failure;
3571 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3572
3573 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3574 if (nla == NULL)
3575 goto nla_put_failure;
3576 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3577
04561c1f
TG		 3578 nla_nest_end(skb, protoinfo);
3579 return nlmsg_end(skb, nlh);
1da177e4 3580
04561c1f 3581nla_put_failure:
26932566
PM		 3582 nlmsg_cancel(skb, nlh);
3583 return -EMSGSIZE;
1da177e4
LT		 3584}
3585
3586static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3587{
3588 int idx, err;
3589 int s_idx = cb->args[0];
3590 struct net_device *dev;
3591 struct inet6_dev *idev;
3592
3593 read_lock(&dev_base_lock);
7562f876 3594 idx = 0;
881d966b 3595 for_each_netdev(&init_net, dev) {
1da177e4 3596 if (idx < s_idx)
7562f876 3597 goto cont;
1da177e4 3598 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3599 goto cont;
1ab1457c 3600 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3601 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3602 in6_dev_put(idev);
3603 if (err <= 0)
3604 break;
7562f876
PE		 3605cont:
3606 idx++;
1da177e4
LT		 3607 }
3608 read_unlock(&dev_base_lock);
3609 cb->args[0] = idx;
3610
3611 return skb->len;
3612}
3613
3614void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3615{
3616 struct sk_buff *skb;
8d7a76c9 3617 int err = -ENOBUFS;
1ab1457c 3618
339bf98f 3619 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3620 if (skb == NULL)
3621 goto errout;
3622
3623 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3624 if (err < 0) {
3625 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3626 WARN_ON(err == -EMSGSIZE);
3627 kfree_skb(skb);
3628 goto errout;
3629 }
8d7a76c9
TG		 3630 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3631errout:
3632 if (err < 0)
3633 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3634}
3635
339bf98f
TG		 3636static inline size_t inet6_prefix_nlmsg_size(void)
3637{
3638 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3639 + nla_total_size(sizeof(struct in6_addr))
3640 + nla_total_size(sizeof(struct prefix_cacheinfo));
3641}
c5396a31 3642
1da177e4 3643static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3644 struct prefix_info *pinfo, u32 pid, u32 seq,
3645 int event, unsigned int flags)
1da177e4 3646{
6051e2f4
TG		 3647 struct prefixmsg *pmsg;
3648 struct nlmsghdr *nlh;
1da177e4
LT		 3649 struct prefix_cacheinfo ci;
3650
6051e2f4
TG		 3651 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3652 if (nlh == NULL)
26932566 3653 return -EMSGSIZE;
6051e2f4
TG		 3654
3655 pmsg = nlmsg_data(nlh);
1da177e4 3656 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3657 pmsg->prefix_pad1 = 0;
3658 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3659 pmsg->prefix_ifindex = idev->dev->ifindex;
3660 pmsg->prefix_len = pinfo->prefix_len;
3661 pmsg->prefix_type = pinfo->type;
8a47077a 3662 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3663 pmsg->prefix_flags = 0;
3664 if (pinfo->onlink)
3665 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3666 if (pinfo->autoconf)
3667 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3668
6051e2f4 3669 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3670
3671 ci.preferred_time = ntohl(pinfo->prefered);
3672 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3673 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3674
6051e2f4 3675 return nlmsg_end(skb, nlh);
1da177e4 3676
6051e2f4 3677nla_put_failure:
26932566
PM		 3678 nlmsg_cancel(skb, nlh);
3679 return -EMSGSIZE;
1da177e4
LT		 3680}
3681
1ab1457c 3682static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3683 struct prefix_info *pinfo)
3684{
3685 struct sk_buff *skb;
8c384bfa 3686 int err = -ENOBUFS;
1da177e4 3687
339bf98f 3688 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3689 if (skb == NULL)
3690 goto errout;
3691
3692 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3693 if (err < 0) {
3694 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3695 WARN_ON(err == -EMSGSIZE);
3696 kfree_skb(skb);
3697 goto errout;
3698 }
8c384bfa
TG		 3699 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3700errout:
3701 if (err < 0)
3702 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3703}
3704
1da177e4
LT		 3705static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3706{
3707 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3708
3709 switch (event) {
3710 case RTM_NEWADDR:
95c385b4
NH		 3711 /*
3712 * If the address was optimistic
3713 * we inserted the route at the start of
3714 * our DAD process, so we don't need
3715 * to do it again
3716 */
3717 if (!(ifp->rt->rt6i_node))
3718 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3719 if (ifp->idev->cnf.forwarding)
3720 addrconf_join_anycast(ifp);
3721 break;
3722 case RTM_DELADDR:
3723 if (ifp->idev->cnf.forwarding)
3724 addrconf_leave_anycast(ifp);
3725 addrconf_leave_solict(ifp->idev, &ifp->addr);
3726 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3727 if (ip6_del_rt(ifp->rt))
1da177e4 3728 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3729 break;
3730 }
3731}
3732
3733static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3734{
8814c4b5 3735 rcu_read_lock_bh();
1da177e4
LT		 3736 if (likely(ifp->idev->dead == 0))
3737 __ipv6_ifa_notify(event, ifp);
8814c4b5 3738 rcu_read_unlock_bh();
1da177e4
LT		 3739}
3740
3741#ifdef CONFIG_SYSCTL
3742
3743static
3744int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3745 void __user *buffer, size_t *lenp, loff_t *ppos)
3746{
3747 int *valp = ctl->data;
3748 int val = *valp;
3749 int ret;
3750
3751 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3752
3753 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3754 if (valp != &ipv6_devconf.forwarding) {
3755 if ((!*valp) ^ (!val)) {
3756 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3757 if (idev == NULL)
3758 return ret;
3759 dev_forward_change(idev);
3760 }
3761 } else {
3762 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3763 addrconf_forward_change();
3764 }
3765 if (*valp)
3766 rt6_purge_dflt_routers();
3767 }
3768
1ab1457c 3769 return ret;
1da177e4
LT		 3770}
3771
1ab1457c 3772static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3773 int __user *name, int nlen,
3774 void __user *oldval,
3775 size_t __user *oldlenp,
1f29bcd7 3776 void __user *newval, size_t newlen)
1da177e4
LT		 3777{
3778 int *valp = table->data;
3779 int new;
3780
3781 if (!newval || !newlen)
3782 return 0;
3783 if (newlen != sizeof(int))
3784 return -EINVAL;
3785 if (get_user(new, (int __user *)newval))
3786 return -EFAULT;
3787 if (new == *valp)
3788 return 0;
3789 if (oldval && oldlenp) {
3790 size_t len;
3791 if (get_user(len, oldlenp))
3792 return -EFAULT;
3793 if (len) {
3794 if (len > table->maxlen)
3795 len = table->maxlen;
3796 if (copy_to_user(oldval, valp, len))
3797 return -EFAULT;
3798 if (put_user(len, oldlenp))
3799 return -EFAULT;
3800 }
3801 }
3802
3803 if (valp != &ipv6_devconf_dflt.forwarding) {
3804 if (valp != &ipv6_devconf.forwarding) {
3805 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3806 int changed;
3807 if (unlikely(idev == NULL))
3808 return -ENODEV;
3809 changed = (!*valp) ^ (!new);
3810 *valp = new;
3811 if (changed)
3812 dev_forward_change(idev);
3813 } else {
3814 *valp = new;
3815 addrconf_forward_change();
3816 }
3817
3818 if (*valp)
3819 rt6_purge_dflt_routers();
3820 } else
3821 *valp = new;
3822
3823 return 1;
3824}
3825
3826static struct addrconf_sysctl_table
3827{
3828 struct ctl_table_header *sysctl_header;
3829 ctl_table addrconf_vars[__NET_IPV6_MAX];
3830 ctl_table addrconf_dev[2];
3831 ctl_table addrconf_conf_dir[2];
3832 ctl_table addrconf_proto_dir[2];
3833 ctl_table addrconf_root_dir[2];
ab32ea5d 3834} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3835 .sysctl_header = NULL,
3836 .addrconf_vars = {
1ab1457c 3837 {
1da177e4
LT		 3838 .ctl_name = NET_IPV6_FORWARDING,
3839 .procname = "forwarding",
1ab1457c 3840 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3841 .maxlen = sizeof(int),
3842 .mode = 0644,
1ab1457c 3843 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3844 .strategy = &addrconf_sysctl_forward_strategy,
3845 },
3846 {
3847 .ctl_name = NET_IPV6_HOP_LIMIT,
3848 .procname = "hop_limit",
1ab1457c 3849 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3850 .maxlen = sizeof(int),
3851 .mode = 0644,
3852 .proc_handler = proc_dointvec,
3853 },
3854 {
3855 .ctl_name = NET_IPV6_MTU,
3856 .procname = "mtu",
3857 .data = &ipv6_devconf.mtu6,
1ab1457c 3858 .maxlen = sizeof(int),
1da177e4 3859 .mode = 0644,
1ab1457c 3860 .proc_handler = &proc_dointvec,
1da177e4
LT		 3861 },
3862 {
3863 .ctl_name = NET_IPV6_ACCEPT_RA,
3864 .procname = "accept_ra",
1ab1457c 3865 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3866 .maxlen = sizeof(int),
3867 .mode = 0644,
1ab1457c 3868 .proc_handler = &proc_dointvec,
1da177e4
LT		 3869 },
3870 {
3871 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3872 .procname = "accept_redirects",
1ab1457c 3873 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3874 .maxlen = sizeof(int),
3875 .mode = 0644,
1ab1457c 3876 .proc_handler = &proc_dointvec,
1da177e4
LT		 3877 },
3878 {
3879 .ctl_name = NET_IPV6_AUTOCONF,
3880 .procname = "autoconf",
1ab1457c 3881 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3882 .maxlen = sizeof(int),
3883 .mode = 0644,
1ab1457c 3884 .proc_handler = &proc_dointvec,
1da177e4
LT		 3885 },
3886 {
3887 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3888 .procname = "dad_transmits",
1ab1457c 3889 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3890 .maxlen = sizeof(int),
3891 .mode = 0644,
1ab1457c 3892 .proc_handler = &proc_dointvec,
1da177e4
LT		 3893 },
3894 {
3895 .ctl_name = NET_IPV6_RTR_SOLICITS,
3896 .procname = "router_solicitations",
1ab1457c 3897 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3898 .maxlen = sizeof(int),
3899 .mode = 0644,
1ab1457c 3900 .proc_handler = &proc_dointvec,
1da177e4
LT		 3901 },
3902 {
3903 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3904 .procname = "router_solicitation_interval",
1ab1457c 3905 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3906 .maxlen = sizeof(int),
3907 .mode = 0644,
1ab1457c 3908 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3909 .strategy = &sysctl_jiffies,
3910 },
3911 {
3912 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3913 .procname = "router_solicitation_delay",
1ab1457c 3914 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3915 .maxlen = sizeof(int),
3916 .mode = 0644,
1ab1457c 3917 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3918 .strategy = &sysctl_jiffies,
3919 },
3920 {
3921 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3922 .procname = "force_mld_version",
1ab1457c 3923 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3924 .maxlen = sizeof(int),
3925 .mode = 0644,
1ab1457c 3926 .proc_handler = &proc_dointvec,
1da177e4
LT		 3927 },
3928#ifdef CONFIG_IPV6_PRIVACY
3929 {
3930 .ctl_name = NET_IPV6_USE_TEMPADDR,
3931 .procname = "use_tempaddr",
1ab1457c 3932 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3933 .maxlen = sizeof(int),
3934 .mode = 0644,
1ab1457c 3935 .proc_handler = &proc_dointvec,
1da177e4
LT		 3936 },
3937 {
3938 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3939 .procname = "temp_valid_lft",
1ab1457c 3940 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3941 .maxlen = sizeof(int),
3942 .mode = 0644,
1ab1457c 3943 .proc_handler = &proc_dointvec,
1da177e4
LT		 3944 },
3945 {
3946 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3947 .procname = "temp_prefered_lft",
1ab1457c 3948 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3949 .maxlen = sizeof(int),
3950 .mode = 0644,
1ab1457c 3951 .proc_handler = &proc_dointvec,
1da177e4
LT		 3952 },
3953 {
3954 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3955 .procname = "regen_max_retry",
1ab1457c 3956 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3957 .maxlen = sizeof(int),
3958 .mode = 0644,
1ab1457c 3959 .proc_handler = &proc_dointvec,
1da177e4
LT		 3960 },
3961 {
3962 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3963 .procname = "max_desync_factor",
1ab1457c 3964 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3965 .maxlen = sizeof(int),
3966 .mode = 0644,
1ab1457c 3967 .proc_handler = &proc_dointvec,
1da177e4
LT		 3968 },
3969#endif
3970 {
3971 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3972 .procname = "max_addresses",
3973 .data = &ipv6_devconf.max_addresses,
3974 .maxlen = sizeof(int),
3975 .mode = 0644,
3976 .proc_handler = &proc_dointvec,
3977 },
65f5c7c1
YH		 3978 {
3979 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3980 .procname = "accept_ra_defrtr",
1ab1457c 3981 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3982 .maxlen = sizeof(int),
3983 .mode = 0644,
1ab1457c 3984 .proc_handler = &proc_dointvec,
65f5c7c1 3985 },
c4fd30eb
YH		 3986 {
3987 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3988 .procname = "accept_ra_pinfo",
1ab1457c 3989 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3990 .maxlen = sizeof(int),
3991 .mode = 0644,
1ab1457c 3992 .proc_handler = &proc_dointvec,
c4fd30eb 3993 },
930d6ff2
YH		 3994#ifdef CONFIG_IPV6_ROUTER_PREF
3995 {
3996 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3997 .procname = "accept_ra_rtr_pref",
3998 .data = &ipv6_devconf.accept_ra_rtr_pref,
3999 .maxlen = sizeof(int),
4000 .mode = 0644,
4001 .proc_handler = &proc_dointvec,
4002 },
52e16356
YH		 4003 {
4004 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4005 .procname = "router_probe_interval",
4006 .data = &ipv6_devconf.rtr_probe_interval,
4007 .maxlen = sizeof(int),
4008 .mode = 0644,
4009 .proc_handler = &proc_dointvec_jiffies,
4010 .strategy = &sysctl_jiffies,
4011 },
fa03ef38 4012#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4013 {
4014 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4015 .procname = "accept_ra_rt_info_max_plen",
4016 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4017 .maxlen = sizeof(int),
4018 .mode = 0644,
4019 .proc_handler = &proc_dointvec,
4020 },
4021#endif
930d6ff2 4022#endif
fbea49e1
YH		 4023 {
4024 .ctl_name = NET_IPV6_PROXY_NDP,
4025 .procname = "proxy_ndp",
4026 .data = &ipv6_devconf.proxy_ndp,
4027 .maxlen = sizeof(int),
4028 .mode = 0644,
4029 .proc_handler = &proc_dointvec,
4030 },
0bcbc926
YH		 4031 {
4032 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4033 .procname = "accept_source_route",
4034 .data = &ipv6_devconf.accept_source_route,
4035 .maxlen = sizeof(int),
4036 .mode = 0644,
4037 .proc_handler = &proc_dointvec,
4038 },
95c385b4
NH		 4039#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4040 {
4041 .ctl_name = CTL_UNNUMBERED,
4042 .procname = "optimistic_dad",
4043 .data = &ipv6_devconf.optimistic_dad,
4044 .maxlen = sizeof(int),
4045 .mode = 0644,
4046 .proc_handler = &proc_dointvec,
4047
4048 },
4049#endif
1da177e4
LT		 4050 {
4051 .ctl_name = 0, /* sentinel */
4052 }
4053 },
4054 .addrconf_dev = {
4055 {
4056 .ctl_name = NET_PROTO_CONF_ALL,
4057 .procname = "all",
4058 .mode = 0555,
4059 .child = addrconf_sysctl.addrconf_vars,
4060 },
4061 {
4062 .ctl_name = 0, /* sentinel */
4063 }
4064 },
4065 .addrconf_conf_dir = {
4066 {
4067 .ctl_name = NET_IPV6_CONF,
4068 .procname = "conf",
4069 .mode = 0555,
4070 .child = addrconf_sysctl.addrconf_dev,
4071 },
4072 {
4073 .ctl_name = 0, /* sentinel */
4074 }
4075 },
4076 .addrconf_proto_dir = {
4077 {
4078 .ctl_name = NET_IPV6,
4079 .procname = "ipv6",
4080 .mode = 0555,
4081 .child = addrconf_sysctl.addrconf_conf_dir,
4082 },
4083 {
4084 .ctl_name = 0, /* sentinel */
4085 }
4086 },
4087 .addrconf_root_dir = {
4088 {
4089 .ctl_name = CTL_NET,
4090 .procname = "net",
4091 .mode = 0555,
4092 .child = addrconf_sysctl.addrconf_proto_dir,
4093 },
4094 {
4095 .ctl_name = 0, /* sentinel */
4096 }
4097 },
4098};
4099
4100static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4101{
4102 int i;
4103 struct net_device *dev = idev ? idev->dev : NULL;
4104 struct addrconf_sysctl_table *t;
4105 char *dev_name = NULL;
4106
af879cc7 4107 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4108 if (t == NULL)
4109 return;
1da177e4
LT		 4110 for (i=0; t->addrconf_vars[i].data; i++) {
4111 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4112 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4113 }
4114 if (dev) {
1ab1457c 4115 dev_name = dev->name;
1da177e4
LT		 4116 t->addrconf_dev[0].ctl_name = dev->ifindex;
4117 } else {
4118 dev_name = "default";
4119 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4120 }
4121
1ab1457c
YH		 4122 /*
4123 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4124 * by sysctl and we wouldn't want anyone to change it under our feet
4125 * (see SIOCSIFNAME).
1ab1457c 4126 */
543537bd 4127 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4128 if (!dev_name)
4129 goto free;
4130
4131 t->addrconf_dev[0].procname = dev_name;
4132
4133 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4134 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4135 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4136 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4137
0b4d4147 4138 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4139 if (t->sysctl_header == NULL)
4140 goto free_procname;
4141 else
4142 p->sysctl = t;
4143 return;
4144
4145 /* error path */
4146 free_procname:
4147 kfree(dev_name);
4148 free:
4149 kfree(t);
4150
4151 return;
4152}
4153
4154static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4155{
4156 if (p->sysctl) {
4157 struct addrconf_sysctl_table *t = p->sysctl;
4158 p->sysctl = NULL;
4159 unregister_sysctl_table(t->sysctl_header);
4160 kfree(t->addrconf_dev[0].procname);
4161 kfree(t);
4162 }
4163}
4164
4165
4166#endif
4167
4168/*
4169 * Device notifier
4170 */
4171
4172int register_inet6addr_notifier(struct notifier_block *nb)
4173{
1ab1457c 4174 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4175}
4176
7159039a
YH		 4177EXPORT_SYMBOL(register_inet6addr_notifier);
4178
1da177e4
LT		 4179int unregister_inet6addr_notifier(struct notifier_block *nb)
4180{
1ab1457c 4181 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4182}
4183
7159039a
YH		 4184EXPORT_SYMBOL(unregister_inet6addr_notifier);
4185
1da177e4
LT		 4186/*
4187 * Init / cleanup code
4188 */
4189
4190int __init addrconf_init(void)
4191{
4192 int err = 0;
4193
4194 /* The addrconf netdev notifier requires that loopback_dev
4195 * has it's ipv6 private information allocated and setup
4196 * before it can bring up and give link-local addresses
4197 * to other devices which are up.
4198 *
4199 * Unfortunately, loopback_dev is not necessarily the first
4200 * entry in the global dev_base list of net devices. In fact,
4201 * it is likely to be the very last entry on that list.
4202 * So this causes the notifier registry below to try and
4203 * give link-local addresses to all devices besides loopback_dev
4204 * first, then loopback_dev, which cases all the non-loopback_dev
4205 * devices to fail to get a link-local address.
4206 *
4207 * So, as a temporary fix, allocate the ipv6 structure for
4208 * loopback_dev first by hand.
4209 * Longer term, all of the dependencies ipv6 has upon the loopback
4210 * device and it being up should be removed.
4211 */
4212 rtnl_lock();
2774c7ab 4213 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4214 err = -ENOMEM;
4215 rtnl_unlock();
4216 if (err)
4217 return err;
4218
2774c7ab
EB		 4219 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4220 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4221#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4222 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4223 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4224 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4225 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4226#endif
c62dba90 4227
1da177e4
LT		 4228 register_netdevice_notifier(&ipv6_dev_notf);
4229
1da177e4 4230 addrconf_verify(0);
c127ea2c
TG		 4231
4232 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4233 if (err < 0)
4234 goto errout;
4235
4236 /* Only the first call to __rtnl_register can fail */
4237 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4238 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4239 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4240 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4241 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4242
1da177e4
LT		 4243#ifdef CONFIG_SYSCTL
4244 addrconf_sysctl.sysctl_header =
0b4d4147 4245 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4246 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4247#endif
4248
4249 return 0;
c127ea2c
TG		 4250errout:
4251 unregister_netdevice_notifier(&ipv6_dev_notf);
4252
4253 return err;
1da177e4
LT		 4254}
4255
4256void __exit addrconf_cleanup(void)
4257{
1ab1457c 4258 struct net_device *dev;
1ab1457c 4259 struct inet6_ifaddr *ifa;
1da177e4
LT		 4260 int i;
4261
4262 unregister_netdevice_notifier(&ipv6_dev_notf);
4263
1da177e4
LT		 4264#ifdef CONFIG_SYSCTL
4265 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4266 addrconf_sysctl_unregister(&ipv6_devconf);
4267#endif
4268
4269 rtnl_lock();
4270
4271 /*
4272 * clean dev list.
4273 */
4274
881d966b 4275 for_each_netdev(&init_net, dev) {
dffe4f04 4276 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4277 continue;
4278 addrconf_ifdown(dev, 1);
4279 }
2774c7ab 4280 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4281
4282 /*
4283 * Check hash table.
4284 */
4285
4286 write_lock_bh(&addrconf_hash_lock);
4287 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4288 for (ifa=inet6_addr_lst[i]; ifa; ) {
4289 struct inet6_ifaddr *bifa;
4290
4291 bifa = ifa;
4292 ifa = ifa->lst_next;
4293 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4294 /* Do not free it; something is wrong.
4295 Now we can investigate it with debugger.
4296 */
4297 }
4298 }
4299 write_unlock_bh(&addrconf_hash_lock);
4300
4301 del_timer(&addr_chk_timer);
4302
4303 rtnl_unlock();
1da177e4 4304}
Clone of davem's net-next-2.6 tree