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[ATM] drivers/atm/ambassador.c: stop inlining largish static functions
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
ab32ea5d 157struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 188};
189
ab32ea5d 190static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201#ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207#endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 209 .accept_ra_defrtr = 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216#endif
930d6ff2 217#endif
fbea49e1 218 .proxy_ndp = 0,
0bcbc926 219 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 220};
221
222/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 223const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
1da177e4
LT		 232static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233{
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236}
237
238enum addrconf_timer_t
239{
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243};
244
245static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248{
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263}
264
7f7d9a6b
HX		 265static int snmp6_alloc_dev(struct inet6_dev *idev)
266{
7f7d9a6b 267 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 268 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 271 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 272 goto err_icmp;
14878f75 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 274 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 275 goto err_icmpmsg;
7f7d9a6b
HX		 276
277 return 0;
278
14878f75
DS		 279err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 281err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283err_ip:
aaf70ec7 284 return -ENOMEM;
7f7d9a6b
HX		 285}
286
16910b98 287static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 288{
14878f75 289 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 292}
293
1da177e4
LT		 294/* Nobody refers to this device, we may destroy it. */
295
8814c4b5
YH		 296static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297{
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300}
301
1da177e4
LT		 302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
8814c4b5 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 317}
318
7159039a
YH		 319EXPORT_SYMBOL(in6_dev_finish_destroy);
320
1da177e4
LT		 321static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322{
323 struct inet6_dev *ndev;
d88ae4cc 324 struct in6_addr maddr;
1da177e4
LT		 325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
1ab1457c 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 332
1ab1457c
YH		 333 if (ndev == NULL)
334 return NULL;
322f74a4
IO		 335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
c346dca1 338 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
1da177e4 348
322f74a4
IO		 349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 352 __func__, dev->name));
322f74a4
IO		 353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
1da177e4 358
322f74a4
IO		 359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 362 __func__, dev->name));
322f74a4
IO		 363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
1da177e4
LT		 373
374#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 378#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380#endif
381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
322f74a4
IO		 393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
1da177e4
LT		 397#endif
398
f24e3d65 399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 400 ndev->if_flags |= IF_READY;
401
322f74a4
IO		 402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
f52295a9 404 addrconf_sysctl_register(ndev);
30c4cf57
DS		 405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
1da177e4
LT		 412 return ndev;
413}
414
415static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
1ab1457c 443
1da177e4
LT		 444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
1da177e4
LT		 452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457}
458
459
e186932b 460static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 461{
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
bff16c2f 466 for_each_netdev(net, dev) {
8814c4b5 467 rcu_read_lock();
1da177e4
LT		 468 idev = __in6_dev_get(dev);
469 if (idev) {
e186932b
PE		 470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
1da177e4
LT		 472 if (changed)
473 dev_forward_change(idev);
474 }
8814c4b5 475 rcu_read_unlock();
1da177e4
LT		 476 }
477 read_unlock(&dev_base_lock);
478}
c8fecf22
PE		 479
480static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481{
bff16c2f
PE		 482 struct net *net;
483
484 net = (struct net *)table->extra2;
441fc2a2 485 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 486 return;
487
e186932b
PE		 488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
c8fecf22
PE		 492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
7b4da532 496 rt6_purge_dflt_routers(net);
c8fecf22 497}
1da177e4
LT		 498#endif
499
500/* Nobody refers to this ifaddr, destroy it */
501
502void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503{
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506#ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508#endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522}
523
e55ffac6
BH		 524static void
525ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526{
527 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
8a6ce0c0 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542}
543
1da177e4
LT		 544/* On success it returns ifp with increased reference count */
545
546static struct inet6_ifaddr *
547ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 548 int scope, u32 flags)
1da177e4
LT		 549{
550 struct inet6_ifaddr *ifa = NULL;
551 struct rt6_info *rt;
552 int hash;
553 int err = 0;
554
8814c4b5 555 rcu_read_lock_bh();
1da177e4
LT		 556 if (idev->dead) {
557 err = -ENODEV; /*XXX*/
558 goto out2;
559 }
560
561 write_lock(&addrconf_hash_lock);
562
563 /* Ignore adding duplicate addresses on an interface */
c346dca1 564 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
322f74a4 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
1da177e4
LT		 584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
57f5f544
KF		 594 ifa->rt = rt;
595
95c385b4
NH		 596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
1da177e4
LT		 606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
e55ffac6 621 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 622
623#ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629#endif
630
1da177e4
LT		 631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633out2:
8814c4b5 634 rcu_read_unlock_bh();
1da177e4 635
fd92833a 636 if (likely(err == 0))
e041c683 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647}
648
649/* This function wants to get referenced ifp and releases it before return */
650
651static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652{
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676#ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692#endif
693
1d142804 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
1d142804 702 continue;
1da177e4
LT		 703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
1d142804 726 ifap = &ifa->if_next;
1da177e4
LT		 727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
e041c683 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
c346dca1 754 struct net *net = dev_net(ifp->idev->dev);
1da177e4 755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 756 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4
LT		 757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
e0a1ad73 760 ip6_del_rt(rt);
1da177e4
LT		 761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771}
772
773#ifdef CONFIG_IPV6_PRIVACY
774static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775{
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 779 unsigned long regen_advance;
1da177e4
LT		 780 int tmp_plen;
781 int ret = 0;
782 int max_addresses;
95c385b4 783 u32 addr_flags;
1da177e4
LT		 784
785 write_lock(&idev->lock);
786 if (ift) {
787 spin_lock_bh(&ift->lock);
788 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
789 spin_unlock_bh(&ift->lock);
790 tmpaddr = &addr;
791 } else {
792 tmpaddr = NULL;
793 }
794retry:
795 in6_dev_hold(idev);
796 if (idev->cnf.use_tempaddr <= 0) {
797 write_unlock(&idev->lock);
798 printk(KERN_INFO
799 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
800 in6_dev_put(idev);
801 ret = -1;
802 goto out;
803 }
804 spin_lock_bh(&ifp->lock);
805 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
806 idev->cnf.use_tempaddr = -1; /*XXX*/
807 spin_unlock_bh(&ifp->lock);
808 write_unlock(&idev->lock);
809 printk(KERN_WARNING
810 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
811 in6_dev_put(idev);
812 ret = -1;
813 goto out;
814 }
815 in6_ifa_hold(ifp);
816 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
817 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
818 spin_unlock_bh(&ifp->lock);
819 write_unlock(&idev->lock);
820 printk(KERN_WARNING
821 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
822 in6_ifa_put(ifp);
823 in6_dev_put(idev);
824 ret = -1;
825 goto out;
826 }
827 memcpy(&addr.s6_addr[8], idev->rndid, 8);
828 tmp_valid_lft = min_t(__u32,
829 ifp->valid_lft,
830 idev->cnf.temp_valid_lft);
1ab1457c
YH		 831 tmp_prefered_lft = min_t(__u32,
832 ifp->prefered_lft,
1da177e4
LT		 833 idev->cnf.temp_prefered_lft - desync_factor / HZ);
834 tmp_plen = ifp->prefix_len;
835 max_addresses = idev->cnf.max_addresses;
836 tmp_cstamp = ifp->cstamp;
837 tmp_tstamp = ifp->tstamp;
838 spin_unlock_bh(&ifp->lock);
839
eac55bf9
BB		 840 regen_advance = idev->cnf.regen_max_retry *
841 idev->cnf.dad_transmits *
842 idev->nd_parms->retrans_time / HZ;
1da177e4 843 write_unlock(&idev->lock);
95c385b4 844
eac55bf9
BB		 845 /* A temporary address is created only if this calculated Preferred
846 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
847 * an implementation must not create a temporary address with a zero
848 * Preferred Lifetime.
849 */
850 if (tmp_prefered_lft <= regen_advance) {
851 in6_ifa_put(ifp);
852 in6_dev_put(idev);
853 ret = -1;
854 goto out;
855 }
856
95c385b4
NH		 857 addr_flags = IFA_F_TEMPORARY;
858 /* set in addrconf_prefix_rcv() */
859 if (ifp->flags & IFA_F_OPTIMISTIC)
860 addr_flags |= IFA_F_OPTIMISTIC;
861
1da177e4 862 ift = !max_addresses ||
1ab1457c 863 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 864 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 865 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
866 addr_flags) : NULL;
1da177e4
LT		 867 if (!ift || IS_ERR(ift)) {
868 in6_ifa_put(ifp);
869 in6_dev_put(idev);
870 printk(KERN_INFO
871 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
872 tmpaddr = &addr;
873 write_lock(&idev->lock);
874 goto retry;
875 }
876
877 spin_lock_bh(&ift->lock);
878 ift->ifpub = ifp;
879 ift->valid_lft = tmp_valid_lft;
880 ift->prefered_lft = tmp_prefered_lft;
881 ift->cstamp = tmp_cstamp;
882 ift->tstamp = tmp_tstamp;
883 spin_unlock_bh(&ift->lock);
884
885 addrconf_dad_start(ift, 0);
886 in6_ifa_put(ift);
887 in6_dev_put(idev);
888out:
889 return ret;
890}
891#endif
892
893/*
072047e4 894 * Choose an appropriate source address (RFC3484)
1da177e4 895 */
a9b05723
YH		 896enum {
897 IPV6_SADDR_RULE_INIT = 0,
898 IPV6_SADDR_RULE_LOCAL,
899 IPV6_SADDR_RULE_SCOPE,
900 IPV6_SADDR_RULE_PREFERRED,
901#ifdef CONFIG_IPV6_MIP6
902 IPV6_SADDR_RULE_HOA,
903#endif
904 IPV6_SADDR_RULE_OIF,
905 IPV6_SADDR_RULE_LABEL,
906#ifdef CONFIG_IPV6_PRIVACY
907 IPV6_SADDR_RULE_PRIVACY,
908#endif
909 IPV6_SADDR_RULE_ORCHID,
910 IPV6_SADDR_RULE_PREFIX,
911 IPV6_SADDR_RULE_MAX
912};
913
072047e4 914struct ipv6_saddr_score {
a9b05723
YH		 915 int rule;
916 int addr_type;
917 struct inet6_ifaddr *ifa;
918 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
919 int scopedist;
920 int matchlen;
072047e4
YH		 921};
922
a9b05723
YH		 923struct ipv6_saddr_dst {
924 struct in6_addr *addr;
925 int ifindex;
926 int scope;
927 int label;
7cbca67c 928 unsigned int prefs;
a9b05723 929};
072047e4 930
b6f99a21 931static inline int ipv6_saddr_preferred(int type)
1da177e4 932{
072047e4
YH		 933 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
934 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
935 return 1;
936 return 0;
1da177e4
LT		 937}
938
a9b05723
YH		 939static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
940 struct ipv6_saddr_dst *dst,
941 int i)
942{
943 int ret;
944
945 if (i <= score->rule) {
946 switch (i) {
947 case IPV6_SADDR_RULE_SCOPE:
948 ret = score->scopedist;
949 break;
950 case IPV6_SADDR_RULE_PREFIX:
951 ret = score->matchlen;
952 break;
953 default:
954 ret = !!test_bit(i, score->scorebits);
955 }
956 goto out;
957 }
958
959 switch (i) {
960 case IPV6_SADDR_RULE_INIT:
961 /* Rule 0: remember if hiscore is not ready yet */
962 ret = !!score->ifa;
963 break;
964 case IPV6_SADDR_RULE_LOCAL:
965 /* Rule 1: Prefer same address */
966 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
967 break;
968 case IPV6_SADDR_RULE_SCOPE:
969 /* Rule 2: Prefer appropriate scope
970 *
971 * ret
972 * ^
973 * -1 | d 15
974 * ---+--+-+---> scope
975 * |
976 * | d is scope of the destination.
977 * B-d | \
978 * | \ <- smaller scope is better if
979 * B-15 | \ if scope is enough for destinaion.
980 * | ret = B - scope (-1 <= scope >= d <= 15).
981 * d-C-1 | /
982 * |/ <- greater is better
983 * -C / if scope is not enough for destination.
984 * /| ret = scope - C (-1 <= d < scope <= 15).
985 *
986 * d - C - 1 < B -15 (for all -1 <= d <= 15).
987 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
988 * Assume B = 0 and we get C > 29.
989 */
990 ret = __ipv6_addr_src_scope(score->addr_type);
991 if (ret >= dst->scope)
992 ret = -ret;
993 else
994 ret -= 128; /* 30 is enough */
995 score->scopedist = ret;
996 break;
997 case IPV6_SADDR_RULE_PREFERRED:
998 /* Rule 3: Avoid deprecated and optimistic addresses */
999 ret = ipv6_saddr_preferred(score->addr_type) ||
1000 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1001 break;
1002#ifdef CONFIG_IPV6_MIP6
1003 case IPV6_SADDR_RULE_HOA:
7cbca67c 1004 {
a9b05723 1005 /* Rule 4: Prefer home address */
7cbca67c
YH		 1006 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1007 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1008 break;
7cbca67c 1009 }
a9b05723
YH		 1010#endif
1011 case IPV6_SADDR_RULE_OIF:
1012 /* Rule 5: Prefer outgoing interface */
1013 ret = (!dst->ifindex ||
1014 dst->ifindex == score->ifa->idev->dev->ifindex);
1015 break;
1016 case IPV6_SADDR_RULE_LABEL:
1017 /* Rule 6: Prefer matching label */
1018 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1019 score->ifa->idev->dev->ifindex) == dst->label;
1020 break;
1021#ifdef CONFIG_IPV6_PRIVACY
1022 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1023 {
a9b05723
YH		 1024 /* Rule 7: Prefer public address
1025 * Note: prefer temprary address if use_tempaddr >= 2
1026 */
7cbca67c
YH		 1027 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1028 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1029 score->ifa->idev->cnf.use_tempaddr >= 2;
1030 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1031 break;
7cbca67c 1032 }
a9b05723
YH		 1033#endif
1034 case IPV6_SADDR_RULE_ORCHID:
1035 /* Rule 8-: Prefer ORCHID vs ORCHID or
1036 * non-ORCHID vs non-ORCHID
1037 */
1038 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1039 ipv6_addr_orchid(dst->addr));
1040 break;
1041 case IPV6_SADDR_RULE_PREFIX:
1042 /* Rule 8: Use longest matching prefix */
1043 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1044 dst->addr);
1045 break;
1046 default:
1047 ret = 0;
1048 }
1049
1050 if (ret)
1051 __set_bit(i, score->scorebits);
1052 score->rule = i;
1053out:
1054 return ret;
1055}
1056
1057int ipv6_dev_get_saddr(struct net_device *dst_dev,
7cbca67c
YH		 1058 struct in6_addr *daddr, unsigned int prefs,
1059 struct in6_addr *saddr)
1da177e4 1060{
a9b05723
YH		 1061 struct ipv6_saddr_score scores[2],
1062 *score = &scores[0], *hiscore = &scores[1];
c346dca1 1063 struct net *net = dev_net(dst_dev);
a9b05723 1064 struct ipv6_saddr_dst dst;
072047e4 1065 struct net_device *dev;
a9b05723 1066 int dst_type;
1da177e4 1067
a9b05723
YH		 1068 dst_type = __ipv6_addr_type(daddr);
1069 dst.addr = daddr;
1070 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1071 dst.scope = __ipv6_addr_src_scope(dst_type);
1072 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
7cbca67c 1073 dst.prefs = prefs;
a9b05723
YH		 1074
1075 hiscore->rule = -1;
1076 hiscore->ifa = NULL;
1da177e4 1077
072047e4 1078 read_lock(&dev_base_lock);
8814c4b5 1079 rcu_read_lock();
1da177e4 1080
6fda7350 1081 for_each_netdev(net, dev) {
072047e4 1082 struct inet6_dev *idev;
072047e4 1083
a9b05723 1084 /* Candidate Source Address (section 4)
072047e4
YH		 1085 * - multicast and link-local destination address,
1086 * the set of candidate source address MUST only
1087 * include addresses assigned to interfaces
1088 * belonging to the same link as the outgoing
1089 * interface.
1090 * (- For site-local destination addresses, the
1091 * set of candidate source addresses MUST only
1092 * include addresses assigned to interfaces
1093 * belonging to the same site as the outgoing
1094 * interface.)
1095 */
a9b05723
YH		 1096 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1097 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1098 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1099 continue;
1da177e4 1100
1da177e4 1101 idev = __in6_dev_get(dev);
072047e4
YH		 1102 if (!idev)
1103 continue;
1104
1105 read_lock_bh(&idev->lock);
a9b05723
YH		 1106 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1107 int i;
072047e4 1108
a9b05723 1109 /*
6b3ae80a
YH		 1110 * - Tentative Address (RFC2462 section 5.4)
1111 * - A tentative address is not considered
1112 * "assigned to an interface" in the traditional
95c385b4 1113 * sense, unless it is also flagged as optimistic.
6b3ae80a 1114 * - Candidate Source Address (section 4)
072047e4
YH		 1115 * - In any case, anycast addresses, multicast
1116 * addresses, and the unspecified address MUST
1117 * NOT be included in a candidate set.
1118 */
a9b05723
YH		 1119 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1120 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1121 continue;
a9b05723
YH		 1122
1123 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1124
1125 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1126 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1127 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1128 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1129 "assigned as unicast address on %s",
1130 dev->name);
1131 continue;
1132 }
1133
a9b05723
YH		 1134 score->rule = -1;
1135 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1136
1137 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1138 int minihiscore, miniscore;
1139
1140 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1141 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1142
1143 if (minihiscore > miniscore) {
1144 if (i == IPV6_SADDR_RULE_SCOPE &&
1145 score->scopedist > 0) {
1146 /*
1147 * special case:
1148 * each remaining entry
1149 * has too small (not enough)
1150 * scope, because ifa entries
1151 * are sorted by their scope
1152 * values.
1153 */
1154 goto try_nextdev;
1155 }
1156 break;
1157 } else if (minihiscore < miniscore) {
1158 struct ipv6_saddr_score *tmp;
1159
1160 if (hiscore->ifa)
1161 in6_ifa_put(hiscore->ifa);
1162
1163 in6_ifa_hold(score->ifa);
1164
1165 tmp = hiscore;
1166 hiscore = score;
1167 score = tmp;
1168
1169 /* restore our iterator */
1170 score->ifa = hiscore->ifa;
1171
1172 break;
1da177e4 1173 }
072047e4 1174 }
1da177e4 1175 }
a9b05723 1176try_nextdev:
072047e4 1177 read_unlock_bh(&idev->lock);
1da177e4 1178 }
8814c4b5 1179 rcu_read_unlock();
1da177e4
LT		 1180 read_unlock(&dev_base_lock);
1181
a9b05723 1182 if (!hiscore->ifa)
072047e4 1183 return -EADDRNOTAVAIL;
1ab1457c 1184
a9b05723
YH		 1185 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1186 in6_ifa_put(hiscore->ifa);
072047e4 1187 return 0;
1da177e4
LT		 1188}
1189
5e5f3f0f 1190EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1191
95c385b4
NH		 1192int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1193 unsigned char banned_flags)
1da177e4
LT		 1194{
1195 struct inet6_dev *idev;
1196 int err = -EADDRNOTAVAIL;
1197
8814c4b5 1198 rcu_read_lock();
1da177e4
LT		 1199 if ((idev = __in6_dev_get(dev)) != NULL) {
1200 struct inet6_ifaddr *ifp;
1201
1202 read_lock_bh(&idev->lock);
1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1204 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1205 ipv6_addr_copy(addr, &ifp->addr);
1206 err = 0;
1207 break;
1208 }
1209 }
1210 read_unlock_bh(&idev->lock);
1211 }
8814c4b5 1212 rcu_read_unlock();
1da177e4
LT		 1213 return err;
1214}
1215
1216static int ipv6_count_addresses(struct inet6_dev *idev)
1217{
1218 int cnt = 0;
1219 struct inet6_ifaddr *ifp;
1220
1221 read_lock_bh(&idev->lock);
1222 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1223 cnt++;
1224 read_unlock_bh(&idev->lock);
1225 return cnt;
1226}
1227
bfeade08
DL		 1228int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1229 struct net_device *dev, int strict)
1da177e4
LT		 1230{
1231 struct inet6_ifaddr * ifp;
1232 u8 hash = ipv6_addr_hash(addr);
1233
1234 read_lock_bh(&addrconf_hash_lock);
1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1236 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1237 continue;
1da177e4
LT		 1238 if (ipv6_addr_equal(&ifp->addr, addr) &&
1239 !(ifp->flags&IFA_F_TENTATIVE)) {
1240 if (dev == NULL || ifp->idev->dev == dev ||
1241 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1242 break;
1243 }
1244 }
1245 read_unlock_bh(&addrconf_hash_lock);
1246 return ifp != NULL;
1247}
7159039a
YH		 1248EXPORT_SYMBOL(ipv6_chk_addr);
1249
1da177e4 1250static
06bfe655
DL		 1251int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1252 struct net_device *dev)
1da177e4
LT		 1253{
1254 struct inet6_ifaddr * ifp;
1255 u8 hash = ipv6_addr_hash(addr);
1256
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1258 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1259 continue;
1da177e4
LT		 1260 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 if (dev == NULL || ifp->idev->dev == dev)
1262 break;
1263 }
1264 }
1265 return ifp != NULL;
1266}
1267
1cab3da6
DL		 1268struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1269 struct net_device *dev, int strict)
1da177e4
LT		 1270{
1271 struct inet6_ifaddr * ifp;
1272 u8 hash = ipv6_addr_hash(addr);
1273
1274 read_lock_bh(&addrconf_hash_lock);
1275 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1276 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1277 continue;
1da177e4
LT		 1278 if (ipv6_addr_equal(&ifp->addr, addr)) {
1279 if (dev == NULL || ifp->idev->dev == dev ||
1280 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1281 in6_ifa_hold(ifp);
1282 break;
1283 }
1284 }
1285 }
1286 read_unlock_bh(&addrconf_hash_lock);
1287
1288 return ifp;
1289}
1290
1291int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1292{
1293 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1294 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1295 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1296 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1297 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1298 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1299 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1300 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1301
1302 if (!sk2_rcv_saddr && !sk_ipv6only)
1303 return 1;
1304
1305 if (addr_type2 == IPV6_ADDR_ANY &&
1306 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1307 return 1;
1308
1309 if (addr_type == IPV6_ADDR_ANY &&
1310 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1311 return 1;
1312
1313 if (sk2_rcv_saddr6 &&
1314 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1315 return 1;
1316
1317 if (addr_type == IPV6_ADDR_MAPPED &&
1318 !sk2_ipv6only &&
1319 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1320 return 1;
1321
1322 return 0;
1323}
1324
1325/* Gets referenced address, destroys ifaddr */
1326
9f5336e2 1327static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1328{
1da177e4
LT		 1329 if (ifp->flags&IFA_F_PERMANENT) {
1330 spin_lock_bh(&ifp->lock);
1331 addrconf_del_timer(ifp);
1332 ifp->flags |= IFA_F_TENTATIVE;
1333 spin_unlock_bh(&ifp->lock);
1334 in6_ifa_put(ifp);
1335#ifdef CONFIG_IPV6_PRIVACY
1336 } else if (ifp->flags&IFA_F_TEMPORARY) {
1337 struct inet6_ifaddr *ifpub;
1338 spin_lock_bh(&ifp->lock);
1339 ifpub = ifp->ifpub;
1340 if (ifpub) {
1341 in6_ifa_hold(ifpub);
1342 spin_unlock_bh(&ifp->lock);
1343 ipv6_create_tempaddr(ifpub, ifp);
1344 in6_ifa_put(ifpub);
1345 } else {
1346 spin_unlock_bh(&ifp->lock);
1347 }
1348 ipv6_del_addr(ifp);
1349#endif
1350 } else
1351 ipv6_del_addr(ifp);
1352}
1353
3c21edbd
YH		 1354void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1355{
1356 if (net_ratelimit())
1357 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1358 addrconf_dad_stop(ifp);
1359}
1da177e4
LT		 1360
1361/* Join to solicited addr multicast group. */
1362
1363void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1364{
1365 struct in6_addr maddr;
1366
1367 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1368 return;
1369
1370 addrconf_addr_solict_mult(addr, &maddr);
1371 ipv6_dev_mc_inc(dev, &maddr);
1372}
1373
1374void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1375{
1376 struct in6_addr maddr;
1377
1378 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1379 return;
1380
1381 addrconf_addr_solict_mult(addr, &maddr);
1382 __ipv6_dev_mc_dec(idev, &maddr);
1383}
1384
20380731 1385static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1386{
1387 struct in6_addr addr;
1388 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1389 if (ipv6_addr_any(&addr))
1390 return;
1391 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1392}
1393
20380731 1394static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1395{
1396 struct in6_addr addr;
1397 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1398 if (ipv6_addr_any(&addr))
1399 return;
1400 __ipv6_dev_ac_dec(ifp->idev, &addr);
1401}
1402
073a8e0e
YH		 1403static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1404{
1405 if (dev->addr_len != ETH_ALEN)
1406 return -1;
1407 memcpy(eui, dev->dev_addr, 3);
1408 memcpy(eui + 5, dev->dev_addr + 3, 3);
1409
1410 /*
1411 * The zSeries OSA network cards can be shared among various
1412 * OS instances, but the OSA cards have only one MAC address.
1413 * This leads to duplicate address conflicts in conjunction
1414 * with IPv6 if more than one instance uses the same card.
1415 *
1416 * The driver for these cards can deliver a unique 16-bit
1417 * identifier for each instance sharing the same card. It is
1418 * placed instead of 0xFFFE in the interface identifier. The
1419 * "u" bit of the interface identifier is not inverted in this
1420 * case. Hence the resulting interface identifier has local
1421 * scope according to RFC2373.
1422 */
1423 if (dev->dev_id) {
1424 eui[3] = (dev->dev_id >> 8) & 0xFF;
1425 eui[4] = dev->dev_id & 0xFF;
1426 } else {
1427 eui[3] = 0xFF;
1428 eui[4] = 0xFE;
1429 eui[0] ^= 2;
1430 }
1431 return 0;
1432}
1433
1434static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1435{
1436 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1437 if (dev->addr_len != ARCNET_ALEN)
1438 return -1;
1439 memset(eui, 0, 7);
1440 eui[7] = *(u8*)dev->dev_addr;
1441 return 0;
1442}
1443
1444static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1445{
1446 if (dev->addr_len != INFINIBAND_ALEN)
1447 return -1;
1448 memcpy(eui, dev->dev_addr + 12, 8);
1449 eui[0] |= 2;
1450 return 0;
1451}
1452
1da177e4
LT		 1453static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1454{
1455 switch (dev->type) {
1456 case ARPHRD_ETHER:
1457 case ARPHRD_FDDI:
1458 case ARPHRD_IEEE802_TR:
073a8e0e 1459 return addrconf_ifid_eui48(eui, dev);
1da177e4 1460 case ARPHRD_ARCNET:
073a8e0e 1461 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1462 case ARPHRD_INFINIBAND:
073a8e0e 1463 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1464 case ARPHRD_SIT:
1465 if (dev->priv_flags & IFF_ISATAP)
1466 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1467 }
1468 return -1;
1469}
1470
1471static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1472{
1473 int err = -1;
1474 struct inet6_ifaddr *ifp;
1475
1476 read_lock_bh(&idev->lock);
1477 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1478 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1479 memcpy(eui, ifp->addr.s6_addr+8, 8);
1480 err = 0;
1481 break;
1482 }
1483 }
1484 read_unlock_bh(&idev->lock);
1485 return err;
1486}
1487
1488#ifdef CONFIG_IPV6_PRIVACY
1489/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1490static int __ipv6_regen_rndid(struct inet6_dev *idev)
1491{
1da177e4 1492regen:
955189ef 1493 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1494 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1495
1496 /*
1497 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1498 * check if generated address is not inappropriate
1499 *
1500 * - Reserved subnet anycast (RFC 2526)
1501 * 11111101 11....11 1xxxxxxx
c7dc89c0 1502 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1503 * 00-00-5E-FE-xx-xx-xx-xx
1504 * - value 0
1505 * - XXX: already assigned to an address on the device
1506 */
1ab1457c 1507 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1508 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1509 (idev->rndid[7]&0x80))
1510 goto regen;
1511 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1512 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1513 goto regen;
1514 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1515 goto regen;
1516 }
1517
1518 return 0;
1519}
1520
1521static void ipv6_regen_rndid(unsigned long data)
1522{
1523 struct inet6_dev *idev = (struct inet6_dev *) data;
1524 unsigned long expires;
1525
8814c4b5 1526 rcu_read_lock_bh();
1da177e4
LT		 1527 write_lock_bh(&idev->lock);
1528
1529 if (idev->dead)
1530 goto out;
1531
1532 if (__ipv6_regen_rndid(idev) < 0)
1533 goto out;
1ab1457c 1534
1da177e4 1535 expires = jiffies +
1ab1457c 1536 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1537 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1538 if (time_before(expires, jiffies)) {
1539 printk(KERN_WARNING
1540 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1541 idev->dev->name);
1542 goto out;
1543 }
1544
1545 if (!mod_timer(&idev->regen_timer, expires))
1546 in6_dev_hold(idev);
1547
1548out:
1549 write_unlock_bh(&idev->lock);
8814c4b5 1550 rcu_read_unlock_bh();
1da177e4
LT		 1551 in6_dev_put(idev);
1552}
1553
1554static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1555 int ret = 0;
1556
1557 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1558 ret = __ipv6_regen_rndid(idev);
1559 return ret;
1560}
1561#endif
1562
1563/*
1564 * Add prefix route.
1565 */
1566
1567static void
1568addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1569 unsigned long expires, u32 flags)
1da177e4 1570{
86872cb5
TG		 1571 struct fib6_config cfg = {
1572 .fc_table = RT6_TABLE_PREFIX,
1573 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574 .fc_ifindex = dev->ifindex,
1575 .fc_expires = expires,
1576 .fc_dst_len = plen,
1577 .fc_flags = RTF_UP | flags,
c346dca1 1578 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1579 };
1da177e4 1580
86872cb5 1581 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1582
1583 /* Prevent useless cloning on PtP SIT.
1584 This thing is done here expecting that the whole
1585 class of non-broadcast devices need not cloning.
1586 */
0be669bb 1587#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1588 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1589 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1590#endif
1da177e4 1591
86872cb5 1592 ip6_route_add(&cfg);
1da177e4
LT		 1593}
1594
1595/* Create "default" multicast route to the interface */
1596
1597static void addrconf_add_mroute(struct net_device *dev)
1598{
86872cb5
TG		 1599 struct fib6_config cfg = {
1600 .fc_table = RT6_TABLE_LOCAL,
1601 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1602 .fc_ifindex = dev->ifindex,
1603 .fc_dst_len = 8,
1604 .fc_flags = RTF_UP,
c346dca1 1605 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1606 };
1607
1608 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1609
1610 ip6_route_add(&cfg);
1da177e4
LT		 1611}
1612
0be669bb 1613#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1614static void sit_route_add(struct net_device *dev)
1615{
86872cb5
TG		 1616 struct fib6_config cfg = {
1617 .fc_table = RT6_TABLE_MAIN,
1618 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1619 .fc_ifindex = dev->ifindex,
1620 .fc_dst_len = 96,
1621 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1622 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1623 };
1da177e4
LT		 1624
1625 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1626 ip6_route_add(&cfg);
1da177e4 1627}
0be669bb 1628#endif
1da177e4
LT		 1629
1630static void addrconf_add_lroute(struct net_device *dev)
1631{
1632 struct in6_addr addr;
1633
1634 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1635 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1636}
1637
1638static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1639{
1640 struct inet6_dev *idev;
1641
1642 ASSERT_RTNL();
1643
1644 if ((idev = ipv6_find_idev(dev)) == NULL)
1645 return NULL;
1646
1647 /* Add default multicast route */
1648 addrconf_add_mroute(dev);
1649
1650 /* Add link local route */
1651 addrconf_add_lroute(dev);
1652 return idev;
1653}
1654
1655void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1656{
1657 struct prefix_info *pinfo;
1658 __u32 valid_lft;
1659 __u32 prefered_lft;
1660 int addr_type;
1661 unsigned long rt_expires;
1662 struct inet6_dev *in6_dev;
1663
1664 pinfo = (struct prefix_info *) opt;
1ab1457c 1665
1da177e4
LT		 1666 if (len < sizeof(struct prefix_info)) {
1667 ADBG(("addrconf: prefix option too short\n"));
1668 return;
1669 }
1ab1457c 1670
1da177e4
LT		 1671 /*
1672 * Validation checks ([ADDRCONF], page 19)
1673 */
1674
1675 addr_type = ipv6_addr_type(&pinfo->prefix);
1676
1677 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1678 return;
1679
1680 valid_lft = ntohl(pinfo->valid);
1681 prefered_lft = ntohl(pinfo->prefered);
1682
1683 if (prefered_lft > valid_lft) {
1684 if (net_ratelimit())
1685 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1686 return;
1687 }
1688
1689 in6_dev = in6_dev_get(dev);
1690
1691 if (in6_dev == NULL) {
1692 if (net_ratelimit())
1693 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1694 return;
1695 }
1696
1697 /*
1698 * Two things going on here:
1699 * 1) Add routes for on-link prefixes
1700 * 2) Configure prefixes with the auto flag set
1701 */
1702
1703 /* Avoid arithmetic overflow. Really, we could
1704 save rt_expires in seconds, likely valid_lft,
1705 but it would require division in fib gc, that it
1706 not good.
1707 */
1708 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1709 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1710 else
3dd4bc68
YH		 1711 rt_expires = valid_lft * HZ;
1712
1713 /*
1714 * We convert this (in jiffies) to clock_t later.
1715 * Avoid arithmetic overflow there as well.
1716 * Overflow can happen only if HZ < USER_HZ.
1717 */
1718 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1719 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1720
1721 if (pinfo->onlink) {
1722 struct rt6_info *rt;
c346dca1 1723 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1724 dev->ifindex, 1);
1da177e4
LT		 1725
1726 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1727 if (rt->rt6i_flags&RTF_EXPIRES) {
1728 if (valid_lft == 0) {
e0a1ad73 1729 ip6_del_rt(rt);
1da177e4
LT		 1730 rt = NULL;
1731 } else {
3dd4bc68 1732 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1733 }
1734 }
1735 } else if (valid_lft) {
1736 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1737 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1738 }
1739 if (rt)
1740 dst_release(&rt->u.dst);
1741 }
1742
1743 /* Try to figure out our local address for this prefix */
1744
1745 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1746 struct inet6_ifaddr * ifp;
1747 struct in6_addr addr;
1748 int create = 0, update_lft = 0;
1749
1750 if (pinfo->prefix_len == 64) {
1751 memcpy(&addr, &pinfo->prefix, 8);
1752 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1753 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1754 in6_dev_put(in6_dev);
1755 return;
1756 }
1757 goto ok;
1758 }
1759 if (net_ratelimit())
1760 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1761 pinfo->prefix_len);
1762 in6_dev_put(in6_dev);
1763 return;
1764
1765ok:
1766
c346dca1 1767 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1da177e4
LT		 1768
1769 if (ifp == NULL && valid_lft) {
1770 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1771 u32 addr_flags = 0;
1772
1773#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1774 if (in6_dev->cnf.optimistic_dad &&
1775 !ipv6_devconf.forwarding)
1776 addr_flags = IFA_F_OPTIMISTIC;
1777#endif
1da177e4
LT		 1778
1779 /* Do not allow to create too much of autoconfigured
1780 * addresses; this would be too easy way to crash kernel.
1781 */
1782 if (!max_addresses ||
1783 ipv6_count_addresses(in6_dev) < max_addresses)
1784 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1785 addr_type&IPV6_ADDR_SCOPE_MASK,
1786 addr_flags);
1da177e4
LT		 1787
1788 if (!ifp || IS_ERR(ifp)) {
1789 in6_dev_put(in6_dev);
1790 return;
1791 }
1792
1793 update_lft = create = 1;
1794 ifp->cstamp = jiffies;
1795 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1796 }
1797
1798 if (ifp) {
1799 int flags;
1800 unsigned long now;
1801#ifdef CONFIG_IPV6_PRIVACY
1802 struct inet6_ifaddr *ift;
1803#endif
1804 u32 stored_lft;
1805
1806 /* update lifetime (RFC2462 5.5.3 e) */
1807 spin_lock(&ifp->lock);
1808 now = jiffies;
1809 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1810 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1811 else
1812 stored_lft = 0;
1813 if (!update_lft && stored_lft) {
1814 if (valid_lft > MIN_VALID_LIFETIME ||
1815 valid_lft > stored_lft)
1816 update_lft = 1;
1817 else if (stored_lft <= MIN_VALID_LIFETIME) {
1818 /* valid_lft <= stored_lft is always true */
1819 /* XXX: IPsec */
1820 update_lft = 0;
1821 } else {
1822 valid_lft = MIN_VALID_LIFETIME;
1823 if (valid_lft < prefered_lft)
1824 prefered_lft = valid_lft;
1825 update_lft = 1;
1826 }
1827 }
1828
1829 if (update_lft) {
1830 ifp->valid_lft = valid_lft;
1831 ifp->prefered_lft = prefered_lft;
1832 ifp->tstamp = now;
1833 flags = ifp->flags;
1834 ifp->flags &= ~IFA_F_DEPRECATED;
1835 spin_unlock(&ifp->lock);
1836
1837 if (!(flags&IFA_F_TENTATIVE))
1838 ipv6_ifa_notify(0, ifp);
1839 } else
1840 spin_unlock(&ifp->lock);
1841
1842#ifdef CONFIG_IPV6_PRIVACY
1843 read_lock_bh(&in6_dev->lock);
1844 /* update all temporary addresses in the list */
1845 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1846 /*
1847 * When adjusting the lifetimes of an existing
1848 * temporary address, only lower the lifetimes.
1849 * Implementations must not increase the
1850 * lifetimes of an existing temporary address
1851 * when processing a Prefix Information Option.
1852 */
c6fbfac2
BB		 1853 if (ifp != ift->ifpub)
1854 continue;
1855
1da177e4
LT		 1856 spin_lock(&ift->lock);
1857 flags = ift->flags;
1858 if (ift->valid_lft > valid_lft &&
1859 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1860 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1861 if (ift->prefered_lft > prefered_lft &&
1862 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1863 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1864 spin_unlock(&ift->lock);
1865 if (!(flags&IFA_F_TENTATIVE))
1866 ipv6_ifa_notify(0, ift);
1867 }
1868
1869 if (create && in6_dev->cnf.use_tempaddr > 0) {
1870 /*
1871 * When a new public address is created as described in [ADDRCONF],
1872 * also create a new temporary address.
1873 */
1ab1457c 1874 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1875 ipv6_create_tempaddr(ifp, NULL);
1876 } else {
1877 read_unlock_bh(&in6_dev->lock);
1878 }
1879#endif
1880 in6_ifa_put(ifp);
1881 addrconf_verify(0);
1882 }
1883 }
1884 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1885 in6_dev_put(in6_dev);
1886}
1887
1888/*
1889 * Set destination address.
1890 * Special case for SIT interfaces where we create a new "virtual"
1891 * device.
1892 */
af284937 1893int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 1894{
1895 struct in6_ifreq ireq;
1896 struct net_device *dev;
1897 int err = -EINVAL;
1898
1899 rtnl_lock();
1900
1901 err = -EFAULT;
1902 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1903 goto err_exit;
1904
af284937 1905 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 1906
1907 err = -ENODEV;
1908 if (dev == NULL)
1909 goto err_exit;
1910
0be669bb 1911#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1912 if (dev->type == ARPHRD_SIT) {
1913 struct ifreq ifr;
1914 mm_segment_t oldfs;
1915 struct ip_tunnel_parm p;
1916
1917 err = -EADDRNOTAVAIL;
1918 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1919 goto err_exit;
1920
1921 memset(&p, 0, sizeof(p));
1922 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1923 p.iph.saddr = 0;
1924 p.iph.version = 4;
1925 p.iph.ihl = 5;
1926 p.iph.protocol = IPPROTO_IPV6;
1927 p.iph.ttl = 64;
d20b3109 1928 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1929
1930 oldfs = get_fs(); set_fs(KERNEL_DS);
1931 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1932 set_fs(oldfs);
1933
1934 if (err == 0) {
1935 err = -ENOBUFS;
af284937
DL		 1936 dev = __dev_get_by_name(net, p.name);
1937 if (!dev)
1da177e4
LT		 1938 goto err_exit;
1939 err = dev_open(dev);
1940 }
1941 }
0be669bb 1942#endif
1da177e4
LT		 1943
1944err_exit:
1945 rtnl_unlock();
1946 return err;
1947}
1948
1949/*
1950 * Manual configuration of address on an interface
1951 */
af284937
DL		 1952static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1953 int plen, __u8 ifa_flags, __u32 prefered_lft,
1954 __u32 valid_lft)
1da177e4
LT		 1955{
1956 struct inet6_ifaddr *ifp;
1957 struct inet6_dev *idev;
1958 struct net_device *dev;
1959 int scope;
46d48046 1960 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1961
1962 ASSERT_RTNL();
1ab1457c 1963
0778769d
NT		 1964 /* check the lifetime */
1965 if (!valid_lft || prefered_lft > valid_lft)
1966 return -EINVAL;
1967
af284937
DL		 1968 dev = __dev_get_by_index(net, ifindex);
1969 if (!dev)
1da177e4 1970 return -ENODEV;
1ab1457c 1971
1da177e4
LT		 1972 if ((idev = addrconf_add_dev(dev)) == NULL)
1973 return -ENOBUFS;
1974
1975 scope = ipv6_addr_scope(pfx);
1976
46d48046 1977 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1978 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1979 flags = 0;
1980 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1981 valid_lft = 0x7FFFFFFF/HZ;
1982
1983 if (prefered_lft == 0)
1984 ifa_flags |= IFA_F_DEPRECATED;
1985 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1986 (prefered_lft != INFINITY_LIFE_TIME))
1987 prefered_lft = 0x7FFFFFFF/HZ;
1988
1989 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1990
1da177e4 1991 if (!IS_ERR(ifp)) {
06aebfb7 1992 spin_lock_bh(&ifp->lock);
0778769d
NT		 1993 ifp->valid_lft = valid_lft;
1994 ifp->prefered_lft = prefered_lft;
1995 ifp->tstamp = jiffies;
06aebfb7 1996 spin_unlock_bh(&ifp->lock);
0778769d 1997
46d48046
YH		 1998 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1999 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 2000 /*
2001 * Note that section 3.1 of RFC 4429 indicates
2002 * that the Optimistic flag should not be set for
2003 * manually configured addresses
2004 */
1da177e4
LT		 2005 addrconf_dad_start(ifp, 0);
2006 in6_ifa_put(ifp);
0778769d 2007 addrconf_verify(0);
1da177e4
LT		 2008 return 0;
2009 }
2010
2011 return PTR_ERR(ifp);
2012}
2013
af284937
DL		 2014static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2015 int plen)
1da177e4
LT		 2016{
2017 struct inet6_ifaddr *ifp;
2018 struct inet6_dev *idev;
2019 struct net_device *dev;
1ab1457c 2020
af284937
DL		 2021 dev = __dev_get_by_index(net, ifindex);
2022 if (!dev)
1da177e4
LT		 2023 return -ENODEV;
2024
2025 if ((idev = __in6_dev_get(dev)) == NULL)
2026 return -ENXIO;
2027
2028 read_lock_bh(&idev->lock);
2029 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2030 if (ifp->prefix_len == plen &&
2031 ipv6_addr_equal(pfx, &ifp->addr)) {
2032 in6_ifa_hold(ifp);
2033 read_unlock_bh(&idev->lock);
1ab1457c 2034
1da177e4
LT		 2035 ipv6_del_addr(ifp);
2036
2037 /* If the last address is deleted administratively,
2038 disable IPv6 on this interface.
2039 */
2040 if (idev->addr_list == NULL)
2041 addrconf_ifdown(idev->dev, 1);
2042 return 0;
2043 }
2044 }
2045 read_unlock_bh(&idev->lock);
2046 return -EADDRNOTAVAIL;
2047}
2048
2049
af284937 2050int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2051{
2052 struct in6_ifreq ireq;
2053 int err;
1ab1457c 2054
1da177e4
LT		 2055 if (!capable(CAP_NET_ADMIN))
2056 return -EPERM;
1ab1457c 2057
1da177e4
LT		 2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2059 return -EFAULT;
2060
2061 rtnl_lock();
af284937
DL		 2062 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2063 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2064 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2065 rtnl_unlock();
2066 return err;
2067}
2068
af284937 2069int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2070{
2071 struct in6_ifreq ireq;
2072 int err;
1ab1457c 2073
1da177e4
LT		 2074 if (!capable(CAP_NET_ADMIN))
2075 return -EPERM;
2076
2077 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2078 return -EFAULT;
2079
2080 rtnl_lock();
af284937
DL		 2081 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2082 ireq.ifr6_prefixlen);
1da177e4
LT		 2083 rtnl_unlock();
2084 return err;
2085}
2086
0be669bb 2087#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2088static void sit_add_v4_addrs(struct inet6_dev *idev)
2089{
2090 struct inet6_ifaddr * ifp;
2091 struct in6_addr addr;
2092 struct net_device *dev;
c346dca1 2093 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2094 int scope;
2095
2096 ASSERT_RTNL();
2097
2098 memset(&addr, 0, sizeof(struct in6_addr));
2099 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2100
2101 if (idev->dev->flags&IFF_POINTOPOINT) {
2102 addr.s6_addr32[0] = htonl(0xfe800000);
2103 scope = IFA_LINK;
2104 } else {
2105 scope = IPV6_ADDR_COMPATv4;
2106 }
2107
2108 if (addr.s6_addr32[3]) {
2109 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2110 if (!IS_ERR(ifp)) {
2111 spin_lock_bh(&ifp->lock);
2112 ifp->flags &= ~IFA_F_TENTATIVE;
2113 spin_unlock_bh(&ifp->lock);
2114 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2115 in6_ifa_put(ifp);
2116 }
2117 return;
2118 }
2119
6fda7350 2120 for_each_netdev(net, dev) {
e5ed6399 2121 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2122 if (in_dev && (dev->flags & IFF_UP)) {
2123 struct in_ifaddr * ifa;
2124
2125 int flag = scope;
2126
2127 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2128 int plen;
2129
2130 addr.s6_addr32[3] = ifa->ifa_local;
2131
2132 if (ifa->ifa_scope == RT_SCOPE_LINK)
2133 continue;
2134 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2135 if (idev->dev->flags&IFF_POINTOPOINT)
2136 continue;
2137 flag |= IFA_HOST;
2138 }
2139 if (idev->dev->flags&IFF_POINTOPOINT)
2140 plen = 64;
2141 else
2142 plen = 96;
2143
2144 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2145 IFA_F_PERMANENT);
2146 if (!IS_ERR(ifp)) {
2147 spin_lock_bh(&ifp->lock);
2148 ifp->flags &= ~IFA_F_TENTATIVE;
2149 spin_unlock_bh(&ifp->lock);
2150 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2151 in6_ifa_put(ifp);
2152 }
2153 }
2154 }
1ab1457c 2155 }
1da177e4 2156}
0be669bb 2157#endif
1da177e4
LT		 2158
2159static void init_loopback(struct net_device *dev)
2160{
2161 struct inet6_dev *idev;
2162 struct inet6_ifaddr * ifp;
2163
2164 /* ::1 */
2165
2166 ASSERT_RTNL();
2167
2168 if ((idev = ipv6_find_idev(dev)) == NULL) {
2169 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2170 return;
2171 }
2172
2173 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2174 if (!IS_ERR(ifp)) {
2175 spin_lock_bh(&ifp->lock);
2176 ifp->flags &= ~IFA_F_TENTATIVE;
2177 spin_unlock_bh(&ifp->lock);
2178 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2179 in6_ifa_put(ifp);
2180 }
2181}
2182
2183static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2184{
2185 struct inet6_ifaddr * ifp;
95c385b4
NH		 2186 u32 addr_flags = IFA_F_PERMANENT;
2187
2188#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2189 if (idev->cnf.optimistic_dad &&
2190 !ipv6_devconf.forwarding)
2191 addr_flags |= IFA_F_OPTIMISTIC;
2192#endif
1da177e4 2193
95c385b4
NH		 2194
2195 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2196 if (!IS_ERR(ifp)) {
46d48046 2197 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2198 addrconf_dad_start(ifp, 0);
2199 in6_ifa_put(ifp);
2200 }
2201}
2202
2203static void addrconf_dev_config(struct net_device *dev)
2204{
2205 struct in6_addr addr;
2206 struct inet6_dev * idev;
2207
2208 ASSERT_RTNL();
2209
74235a25
HX		 2210 if ((dev->type != ARPHRD_ETHER) &&
2211 (dev->type != ARPHRD_FDDI) &&
2212 (dev->type != ARPHRD_IEEE802_TR) &&
2213 (dev->type != ARPHRD_ARCNET) &&
2214 (dev->type != ARPHRD_INFINIBAND)) {
2215 /* Alas, we support only Ethernet autoconfiguration. */
2216 return;
2217 }
2218
1da177e4
LT		 2219 idev = addrconf_add_dev(dev);
2220 if (idev == NULL)
2221 return;
2222
2223 memset(&addr, 0, sizeof(struct in6_addr));
2224 addr.s6_addr32[0] = htonl(0xFE800000);
2225
2226 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2227 addrconf_add_linklocal(idev, &addr);
2228}
2229
0be669bb 2230#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2231static void addrconf_sit_config(struct net_device *dev)
2232{
2233 struct inet6_dev *idev;
2234
2235 ASSERT_RTNL();
2236
1ab1457c
YH		 2237 /*
2238 * Configure the tunnel with one of our IPv4
2239 * addresses... we should configure all of
1da177e4
LT		 2240 * our v4 addrs in the tunnel
2241 */
2242
2243 if ((idev = ipv6_find_idev(dev)) == NULL) {
2244 printk(KERN_DEBUG "init sit: add_dev failed\n");
2245 return;
2246 }
2247
c7dc89c0
FT		 2248 if (dev->priv_flags & IFF_ISATAP) {
2249 struct in6_addr addr;
2250
2251 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2252 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2253 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2254 addrconf_add_linklocal(idev, &addr);
2255 return;
2256 }
2257
1da177e4
LT		 2258 sit_add_v4_addrs(idev);
2259
2260 if (dev->flags&IFF_POINTOPOINT) {
2261 addrconf_add_mroute(dev);
2262 addrconf_add_lroute(dev);
2263 } else
2264 sit_route_add(dev);
2265}
0be669bb 2266#endif
1da177e4
LT		 2267
2268static inline int
2269ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2270{
2271 struct in6_addr lladdr;
2272
95c385b4 2273 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2274 addrconf_add_linklocal(idev, &lladdr);
2275 return 0;
2276 }
2277 return -1;
2278}
2279
2280static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2281{
2282 struct net_device *link_dev;
c346dca1 2283 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2284
2285 /* first try to inherit the link-local address from the link device */
2286 if (idev->dev->iflink &&
6fda7350 2287 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2288 if (!ipv6_inherit_linklocal(idev, link_dev))
2289 return;
2290 }
2291 /* then try to inherit it from any device */
6fda7350 2292 for_each_netdev(net, link_dev) {
1da177e4
LT		 2293 if (!ipv6_inherit_linklocal(idev, link_dev))
2294 return;
2295 }
2296 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2297}
2298
2299/*
2300 * Autoconfigure tunnel with a link-local address so routing protocols,
2301 * DHCPv6, MLD etc. can be run over the virtual link
2302 */
2303
2304static void addrconf_ip6_tnl_config(struct net_device *dev)
2305{
2306 struct inet6_dev *idev;
2307
2308 ASSERT_RTNL();
2309
2310 if ((idev = addrconf_add_dev(dev)) == NULL) {
2311 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2312 return;
2313 }
2314 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2315}
2316
1ab1457c 2317static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2318 void * data)
2319{
2320 struct net_device *dev = (struct net_device *) data;
74235a25 2321 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2322 int run_pending = 0;
b217d616 2323 int err;
1da177e4
LT		 2324
2325 switch(event) {
45ba9dd2 2326 case NETDEV_REGISTER:
74235a25 2327 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2328 idev = ipv6_add_dev(dev);
2329 if (!idev)
b217d616 2330 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2331 }
2332 break;
1da177e4 2333 case NETDEV_UP:
3c21edbd 2334 case NETDEV_CHANGE:
c2edacf8
JV		 2335 if (dev->flags & IFF_SLAVE)
2336 break;
2337
3c21edbd 2338 if (event == NETDEV_UP) {
f24e3d65 2339 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2340 /* device is not ready yet. */
2341 printk(KERN_INFO
2342 "ADDRCONF(NETDEV_UP): %s: "
2343 "link is not ready\n",
2344 dev->name);
2345 break;
2346 }
99081049 2347
d31c7b8f
EP		 2348 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2349 idev = ipv6_add_dev(dev);
2350
99081049
KS		 2351 if (idev)
2352 idev->if_flags |= IF_READY;
3c21edbd 2353 } else {
f24e3d65 2354 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2355 /* device is still not ready. */
2356 break;
2357 }
2358
2359 if (idev) {
2360 if (idev->if_flags & IF_READY) {
2361 /* device is already configured. */
2362 break;
2363 }
2364 idev->if_flags |= IF_READY;
2365 }
2366
2367 printk(KERN_INFO
2368 "ADDRCONF(NETDEV_CHANGE): %s: "
2369 "link becomes ready\n",
2370 dev->name);
2371
c5e33bdd 2372 run_pending = 1;
3c21edbd
YH		 2373 }
2374
1da177e4 2375 switch(dev->type) {
0be669bb 2376#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2377 case ARPHRD_SIT:
2378 addrconf_sit_config(dev);
2379 break;
0be669bb 2380#endif
1da177e4
LT		 2381 case ARPHRD_TUNNEL6:
2382 addrconf_ip6_tnl_config(dev);
2383 break;
2384 case ARPHRD_LOOPBACK:
2385 init_loopback(dev);
2386 break;
2387
2388 default:
2389 addrconf_dev_config(dev);
2390 break;
3ff50b79 2391 }
1da177e4 2392 if (idev) {
c5e33bdd
YH		 2393 if (run_pending)
2394 addrconf_dad_run(idev);
2395
1da177e4
LT		 2396 /* If the MTU changed during the interface down, when the
2397 interface up, the changed MTU must be reflected in the
2398 idev as well as routers.
2399 */
2400 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2401 rt6_mtu_change(dev, dev->mtu);
2402 idev->cnf.mtu6 = dev->mtu;
2403 }
2404 idev->tstamp = jiffies;
2405 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2406 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2407 stop IPv6 on this interface.
2408 */
2409 if (dev->mtu < IPV6_MIN_MTU)
2410 addrconf_ifdown(dev, event != NETDEV_DOWN);
2411 }
2412 break;
2413
2414 case NETDEV_CHANGEMTU:
d31c7b8f 2415 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2416 rt6_mtu_change(dev, dev->mtu);
2417 idev->cnf.mtu6 = dev->mtu;
2418 break;
2419 }
2420
d31c7b8f
EP		 2421 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2422 idev = ipv6_add_dev(dev);
2423 if (idev)
2424 break;
2425 }
2426
1da177e4
LT		 2427 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2428
2429 case NETDEV_DOWN:
2430 case NETDEV_UNREGISTER:
2431 /*
2432 * Remove all addresses from this interface.
2433 */
2434 addrconf_ifdown(dev, event != NETDEV_DOWN);
2435 break;
3c21edbd 2436
1da177e4 2437 case NETDEV_CHANGENAME:
1da177e4 2438 if (idev) {
5632c515 2439 snmp6_unregister_dev(idev);
408c4768 2440 addrconf_sysctl_unregister(idev);
f52295a9 2441 addrconf_sysctl_register(idev);
b217d616
HX		 2442 err = snmp6_register_dev(idev);
2443 if (err)
2444 return notifier_from_errno(err);
5632c515 2445 }
1da177e4 2446 break;
3ff50b79 2447 }
1da177e4
LT		 2448
2449 return NOTIFY_OK;
2450}
2451
2452/*
2453 * addrconf module should be notified of a device going up
2454 */
2455static struct notifier_block ipv6_dev_notf = {
2456 .notifier_call = addrconf_notify,
2457 .priority = 0
2458};
2459
2460static int addrconf_ifdown(struct net_device *dev, int how)
2461{
2462 struct inet6_dev *idev;
2463 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2464 struct net *net = dev_net(dev);
1da177e4
LT		 2465 int i;
2466
2467 ASSERT_RTNL();
2468
2774c7ab 2469 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2470 how = 0;
2471
f3db4851 2472 rt6_ifdown(net, dev);
1da177e4
LT		 2473 neigh_ifdown(&nd_tbl, dev);
2474
2475 idev = __in6_dev_get(dev);
2476 if (idev == NULL)
2477 return -ENODEV;
2478
2479 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2480 Do not dev_put!
1da177e4
LT		 2481 */
2482 if (how == 1) {
1da177e4 2483 idev->dead = 1;
8814c4b5
YH		 2484
2485 /* protected by rtnl_lock */
2486 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2487
2488 /* Step 1.5: remove snmp6 entry */
2489 snmp6_unregister_dev(idev);
2490
2491 }
2492
2493 /* Step 2: clear hash table */
2494 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2495 bifa = &inet6_addr_lst[i];
2496
2497 write_lock_bh(&addrconf_hash_lock);
2498 while ((ifa = *bifa) != NULL) {
2499 if (ifa->idev == idev) {
2500 *bifa = ifa->lst_next;
2501 ifa->lst_next = NULL;
2502 addrconf_del_timer(ifa);
2503 in6_ifa_put(ifa);
2504 continue;
2505 }
2506 bifa = &ifa->lst_next;
2507 }
2508 write_unlock_bh(&addrconf_hash_lock);
2509 }
2510
2511 write_lock_bh(&idev->lock);
2512
2513 /* Step 3: clear flags for stateless addrconf */
2514 if (how != 1)
3c21edbd 2515 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2516
2517 /* Step 4: clear address list */
2518#ifdef CONFIG_IPV6_PRIVACY
2519 if (how == 1 && del_timer(&idev->regen_timer))
2520 in6_dev_put(idev);
2521
2522 /* clear tempaddr list */
2523 while ((ifa = idev->tempaddr_list) != NULL) {
2524 idev->tempaddr_list = ifa->tmp_next;
2525 ifa->tmp_next = NULL;
2526 ifa->dead = 1;
2527 write_unlock_bh(&idev->lock);
2528 spin_lock_bh(&ifa->lock);
2529
2530 if (ifa->ifpub) {
2531 in6_ifa_put(ifa->ifpub);
2532 ifa->ifpub = NULL;
2533 }
2534 spin_unlock_bh(&ifa->lock);
2535 in6_ifa_put(ifa);
2536 write_lock_bh(&idev->lock);
2537 }
2538#endif
2539 while ((ifa = idev->addr_list) != NULL) {
2540 idev->addr_list = ifa->if_next;
2541 ifa->if_next = NULL;
2542 ifa->dead = 1;
2543 addrconf_del_timer(ifa);
2544 write_unlock_bh(&idev->lock);
2545
2546 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2547 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2548 in6_ifa_put(ifa);
2549
2550 write_lock_bh(&idev->lock);
2551 }
2552 write_unlock_bh(&idev->lock);
2553
2554 /* Step 5: Discard multicast list */
2555
2556 if (how == 1)
2557 ipv6_mc_destroy_dev(idev);
2558 else
2559 ipv6_mc_down(idev);
2560
1da177e4 2561 idev->tstamp = jiffies;
1ab1457c 2562
1da177e4
LT		 2563 /* Shot the device (if unregistered) */
2564
2565 if (how == 1) {
408c4768 2566 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2567 neigh_parms_release(&nd_tbl, idev->nd_parms);
2568 neigh_ifdown(&nd_tbl, dev);
2569 in6_dev_put(idev);
2570 }
2571 return 0;
2572}
2573
2574static void addrconf_rs_timer(unsigned long data)
2575{
2576 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2577
2578 if (ifp->idev->cnf.forwarding)
2579 goto out;
2580
2581 if (ifp->idev->if_flags & IF_RA_RCVD) {
2582 /*
2583 * Announcement received after solicitation
2584 * was sent
2585 */
2586 goto out;
2587 }
2588
2589 spin_lock(&ifp->lock);
2590 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2591 struct in6_addr all_routers;
2592
2593 /* The wait after the last probe can be shorter */
2594 addrconf_mod_timer(ifp, AC_RS,
2595 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2596 ifp->idev->cnf.rtr_solicit_delay :
2597 ifp->idev->cnf.rtr_solicit_interval);
2598 spin_unlock(&ifp->lock);
2599
2600 ipv6_addr_all_routers(&all_routers);
2601
2602 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2603 } else {
2604 spin_unlock(&ifp->lock);
2605 /*
2606 * Note: we do not support deprecated "all on-link"
2607 * assumption any longer.
2608 */
2609 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2610 ifp->idev->dev->name);
2611 }
2612
2613out:
2614 in6_ifa_put(ifp);
2615}
2616
2617/*
2618 * Duplicate Address Detection
2619 */
3c21edbd
YH		 2620static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2621{
2622 unsigned long rand_num;
2623 struct inet6_dev *idev = ifp->idev;
2624
95c385b4
NH		 2625 if (ifp->flags & IFA_F_OPTIMISTIC)
2626 rand_num = 0;
2627 else
2628 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2629
3c21edbd
YH		 2630 ifp->probes = idev->cnf.dad_transmits;
2631 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2632}
2633
e431b8c0 2634static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2635{
2636 struct inet6_dev *idev = ifp->idev;
2637 struct net_device *dev = idev->dev;
1da177e4
LT		 2638
2639 addrconf_join_solict(dev, &ifp->addr);
2640
1da177e4 2641 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2642
2643 read_lock_bh(&idev->lock);
2644 if (ifp->dead)
2645 goto out;
2646 spin_lock_bh(&ifp->lock);
2647
2648 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2649 !(ifp->flags&IFA_F_TENTATIVE) ||
2650 ifp->flags & IFA_F_NODAD) {
95c385b4 2651 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2652 spin_unlock_bh(&ifp->lock);
2653 read_unlock_bh(&idev->lock);
2654
2655 addrconf_dad_completed(ifp);
2656 return;
2657 }
2658
6732bade 2659 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2660 spin_unlock_bh(&ifp->lock);
6732bade 2661 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2662 /*
2663 * If the defice is not ready:
2664 * - keep it tentative if it is a permanent address.
2665 * - otherwise, kill it.
2666 */
2667 in6_ifa_hold(ifp);
2668 addrconf_dad_stop(ifp);
6732bade 2669 return;
3c21edbd 2670 }
95c385b4
NH		 2671
2672 /*
2673 * Optimistic nodes can start receiving
2674 * Frames right away
2675 */
2676 if(ifp->flags & IFA_F_OPTIMISTIC)
2677 ip6_ins_rt(ifp->rt);
2678
6732bade
YH		 2679 addrconf_dad_kick(ifp);
2680 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2681out:
2682 read_unlock_bh(&idev->lock);
2683}
2684
2685static void addrconf_dad_timer(unsigned long data)
2686{
2687 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2688 struct inet6_dev *idev = ifp->idev;
2689 struct in6_addr unspec;
2690 struct in6_addr mcaddr;
2691
2692 read_lock_bh(&idev->lock);
2693 if (idev->dead) {
2694 read_unlock_bh(&idev->lock);
2695 goto out;
2696 }
2697 spin_lock_bh(&ifp->lock);
2698 if (ifp->probes == 0) {
2699 /*
2700 * DAD was successful
2701 */
2702
95c385b4 2703 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2704 spin_unlock_bh(&ifp->lock);
2705 read_unlock_bh(&idev->lock);
2706
2707 addrconf_dad_completed(ifp);
2708
2709 goto out;
2710 }
2711
2712 ifp->probes--;
2713 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2714 spin_unlock_bh(&ifp->lock);
2715 read_unlock_bh(&idev->lock);
2716
2717 /* send a neighbour solicitation for our addr */
2718 memset(&unspec, 0, sizeof(unspec));
2719 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2720 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2721out:
2722 in6_ifa_put(ifp);
2723}
2724
2725static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2726{
2727 struct net_device * dev = ifp->idev->dev;
2728
2729 /*
2730 * Configure the address for reception. Now it is valid.
2731 */
2732
2733 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2734
2735 /* If added prefix is link local and forwarding is off,
2736 start sending router solicitations.
2737 */
2738
2739 if (ifp->idev->cnf.forwarding == 0 &&
2740 ifp->idev->cnf.rtr_solicits > 0 &&
2741 (dev->flags&IFF_LOOPBACK) == 0 &&
2742 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2743 struct in6_addr all_routers;
2744
2745 ipv6_addr_all_routers(&all_routers);
2746
2747 /*
2748 * If a host as already performed a random delay
2749 * [...] as part of DAD [...] there is no need
2750 * to delay again before sending the first RS
2751 */
2752 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2753
2754 spin_lock_bh(&ifp->lock);
2755 ifp->probes = 1;
2756 ifp->idev->if_flags |= IF_RS_SENT;
2757 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2758 spin_unlock_bh(&ifp->lock);
2759 }
2760}
2761
c5e33bdd
YH		 2762static void addrconf_dad_run(struct inet6_dev *idev) {
2763 struct inet6_ifaddr *ifp;
2764
2765 read_lock_bh(&idev->lock);
2766 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2767 spin_lock_bh(&ifp->lock);
2768 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2769 spin_unlock_bh(&ifp->lock);
2770 continue;
2771 }
2772 spin_unlock_bh(&ifp->lock);
2773 addrconf_dad_kick(ifp);
2774 }
2775 read_unlock_bh(&idev->lock);
2776}
2777
1da177e4
LT		 2778#ifdef CONFIG_PROC_FS
2779struct if6_iter_state {
3c40090a 2780 struct seq_net_private p;
1da177e4
LT		 2781 int bucket;
2782};
2783
2784static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2785{
2786 struct inet6_ifaddr *ifa = NULL;
2787 struct if6_iter_state *state = seq->private;
1218854a 2788 struct net *net = seq_file_net(seq);
1da177e4
LT		 2789
2790 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2791 ifa = inet6_addr_lst[state->bucket];
3c40090a 2792
878628fb 2793 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2794 ifa = ifa->lst_next;
1da177e4
LT		 2795 if (ifa)
2796 break;
2797 }
2798 return ifa;
2799}
2800
2801static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2802{
2803 struct if6_iter_state *state = seq->private;
1218854a 2804 struct net *net = seq_file_net(seq);
1da177e4
LT		 2805
2806 ifa = ifa->lst_next;
2807try_again:
3c40090a 2808 if (ifa) {
878628fb 2809 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2810 ifa = ifa->lst_next;
2811 goto try_again;
2812 }
2813 }
2814
1da177e4
LT		 2815 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2816 ifa = inet6_addr_lst[state->bucket];
2817 goto try_again;
2818 }
3c40090a 2819
1da177e4
LT		 2820 return ifa;
2821}
2822
2823static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2824{
2825 struct inet6_ifaddr *ifa = if6_get_first(seq);
2826
2827 if (ifa)
2828 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2829 --pos;
2830 return pos ? NULL : ifa;
2831}
2832
2833static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2834 __acquires(addrconf_hash_lock)
1da177e4
LT		 2835{
2836 read_lock_bh(&addrconf_hash_lock);
2837 return if6_get_idx(seq, *pos);
2838}
2839
2840static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2841{
2842 struct inet6_ifaddr *ifa;
2843
2844 ifa = if6_get_next(seq, v);
2845 ++*pos;
2846 return ifa;
2847}
2848
2849static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2850 __releases(addrconf_hash_lock)
1da177e4
LT		 2851{
2852 read_unlock_bh(&addrconf_hash_lock);
2853}
2854
2855static int if6_seq_show(struct seq_file *seq, void *v)
2856{
2857 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2858 seq_printf(seq,
9343e79a 2859 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2860 NIP6(ifp->addr),
2861 ifp->idev->dev->ifindex,
2862 ifp->prefix_len,
2863 ifp->scope,
2864 ifp->flags,
2865 ifp->idev->dev->name);
2866 return 0;
2867}
2868
56b3d975 2869static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2870 .start = if6_seq_start,
2871 .next = if6_seq_next,
2872 .show = if6_seq_show,
2873 .stop = if6_seq_stop,
2874};
2875
2876static int if6_seq_open(struct inode *inode, struct file *file)
2877{
3c40090a
DL		 2878 return seq_open_net(inode, file, &if6_seq_ops,
2879 sizeof(struct if6_iter_state));
1da177e4
LT		 2880}
2881
9a32144e 2882static const struct file_operations if6_fops = {
1da177e4
LT		 2883 .owner = THIS_MODULE,
2884 .open = if6_seq_open,
2885 .read = seq_read,
2886 .llseek = seq_lseek,
3c40090a 2887 .release = seq_release_net,
1da177e4
LT		 2888};
2889
3c40090a 2890static int if6_proc_net_init(struct net *net)
1da177e4 2891{
3c40090a 2892 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2893 return -ENOMEM;
2894 return 0;
2895}
2896
3c40090a
DL		 2897static void if6_proc_net_exit(struct net *net)
2898{
2899 proc_net_remove(net, "if_inet6");
2900}
2901
2902static struct pernet_operations if6_proc_net_ops = {
2903 .init = if6_proc_net_init,
2904 .exit = if6_proc_net_exit,
2905};
2906
2907int __init if6_proc_init(void)
2908{
2909 return register_pernet_subsys(&if6_proc_net_ops);
2910}
2911
1da177e4
LT		 2912void if6_proc_exit(void)
2913{
3c40090a 2914 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2915}
2916#endif /* CONFIG_PROC_FS */
2917
59fbb3a6 2918#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2919/* Check if address is a home address configured on any interface. */
389f6612 2920int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2921{
2922 int ret = 0;
2923 struct inet6_ifaddr * ifp;
2924 u8 hash = ipv6_addr_hash(addr);
2925 read_lock_bh(&addrconf_hash_lock);
2926 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 2927 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 2928 continue;
3b9f9a1c
NT		 2929 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2930 (ifp->flags & IFA_F_HOMEADDRESS)) {
2931 ret = 1;
2932 break;
2933 }
2934 }
2935 read_unlock_bh(&addrconf_hash_lock);
2936 return ret;
2937}
2938#endif
2939
1da177e4
LT		 2940/*
2941 * Periodic address status verification
2942 */
2943
2944static void addrconf_verify(unsigned long foo)
2945{
2946 struct inet6_ifaddr *ifp;
2947 unsigned long now, next;
2948 int i;
2949
2950 spin_lock_bh(&addrconf_verify_lock);
2951 now = jiffies;
2952 next = now + ADDR_CHECK_FREQUENCY;
2953
2954 del_timer(&addr_chk_timer);
2955
2956 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2957
2958restart:
5d5780df 2959 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2960 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2961 unsigned long age;
2962#ifdef CONFIG_IPV6_PRIVACY
2963 unsigned long regen_advance;
2964#endif
2965
2966 if (ifp->flags & IFA_F_PERMANENT)
2967 continue;
2968
2969 spin_lock(&ifp->lock);
2970 age = (now - ifp->tstamp) / HZ;
2971
2972#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2973 regen_advance = ifp->idev->cnf.regen_max_retry *
2974 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2975 ifp->idev->nd_parms->retrans_time / HZ;
2976#endif
2977
8f27ebb9
YH		 2978 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2979 age >= ifp->valid_lft) {
1da177e4
LT		 2980 spin_unlock(&ifp->lock);
2981 in6_ifa_hold(ifp);
5d5780df 2982 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2983 ipv6_del_addr(ifp);
2984 goto restart;
8f27ebb9
YH		 2985 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2986 spin_unlock(&ifp->lock);
2987 continue;
1da177e4
LT		 2988 } else if (age >= ifp->prefered_lft) {
2989 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2990 int deprecate = 0;
2991
2992 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2993 deprecate = 1;
2994 ifp->flags |= IFA_F_DEPRECATED;
2995 }
2996
2997 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2998 next = ifp->tstamp + ifp->valid_lft * HZ;
2999
3000 spin_unlock(&ifp->lock);
3001
3002 if (deprecate) {
3003 in6_ifa_hold(ifp);
5d5780df 3004 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3005
3006 ipv6_ifa_notify(0, ifp);
3007 in6_ifa_put(ifp);
3008 goto restart;
3009 }
3010#ifdef CONFIG_IPV6_PRIVACY
3011 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3012 !(ifp->flags&IFA_F_TENTATIVE)) {
3013 if (age >= ifp->prefered_lft - regen_advance) {
3014 struct inet6_ifaddr *ifpub = ifp->ifpub;
3015 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3016 next = ifp->tstamp + ifp->prefered_lft * HZ;
3017 if (!ifp->regen_count && ifpub) {
3018 ifp->regen_count++;
3019 in6_ifa_hold(ifp);
3020 in6_ifa_hold(ifpub);
3021 spin_unlock(&ifp->lock);
5d5780df 3022 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3023 spin_lock(&ifpub->lock);
3024 ifpub->regen_count = 0;
3025 spin_unlock(&ifpub->lock);
1da177e4
LT		 3026 ipv6_create_tempaddr(ifpub, ifp);
3027 in6_ifa_put(ifpub);
3028 in6_ifa_put(ifp);
3029 goto restart;
3030 }
3031 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3032 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3033 spin_unlock(&ifp->lock);
3034#endif
3035 } else {
3036 /* ifp->prefered_lft <= ifp->valid_lft */
3037 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3038 next = ifp->tstamp + ifp->prefered_lft * HZ;
3039 spin_unlock(&ifp->lock);
3040 }
3041 }
5d5780df 3042 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3043 }
3044
3045 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3046 add_timer(&addr_chk_timer);
3047 spin_unlock_bh(&addrconf_verify_lock);
3048}
3049
461d8837
TG		 3050static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3051{
3052 struct in6_addr *pfx = NULL;
3053
3054 if (addr)
3055 pfx = nla_data(addr);
3056
3057 if (local) {
3058 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3059 pfx = NULL;
3060 else
3061 pfx = nla_data(local);
3062 }
3063
3064 return pfx;
3065}
3066
ef7c79ed 3067static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3068 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3069 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3070 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3071};
3072
1da177e4
LT		 3073static int
3074inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3075{
3b1e0a65 3076 struct net *net = sock_net(skb->sk);
b933f716
TG		 3077 struct ifaddrmsg *ifm;
3078 struct nlattr *tb[IFA_MAX+1];
1da177e4 3079 struct in6_addr *pfx;
b933f716 3080 int err;
1da177e4 3081
b933f716
TG		 3082 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3083 if (err < 0)
3084 return err;
3085
3086 ifm = nlmsg_data(nlh);
3087 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3088 if (pfx == NULL)
3089 return -EINVAL;
3090
af284937 3091 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3092}
3093
55ebaef1
NT		 3094static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3095 u32 prefered_lft, u32 valid_lft)
081bba5b 3096{
46d48046
YH		 3097 u32 flags = RTF_EXPIRES;
3098
081bba5b
NT		 3099 if (!valid_lft || (prefered_lft > valid_lft))
3100 return -EINVAL;
3101
46d48046 3102 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3103 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3104 flags = 0;
3105 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3106 valid_lft = 0x7FFFFFFF/HZ;
3107
3108 if (prefered_lft == 0)
55ebaef1 3109 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3110 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3111 (prefered_lft != INFINITY_LIFE_TIME))
3112 prefered_lft = 0x7FFFFFFF/HZ;
3113
3114 spin_lock_bh(&ifp->lock);
3b9f9a1c 3115 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3116 ifp->tstamp = jiffies;
3117 ifp->valid_lft = valid_lft;
3118 ifp->prefered_lft = prefered_lft;
3119
3120 spin_unlock_bh(&ifp->lock);
3121 if (!(ifp->flags&IFA_F_TENTATIVE))
3122 ipv6_ifa_notify(0, ifp);
081bba5b 3123
46d48046
YH		 3124 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3125 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3126 addrconf_verify(0);
3127
3128 return 0;
3129}
3130
1da177e4
LT		 3131static int
3132inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3133{
3b1e0a65 3134 struct net *net = sock_net(skb->sk);
461d8837
TG		 3135 struct ifaddrmsg *ifm;
3136 struct nlattr *tb[IFA_MAX+1];
1da177e4 3137 struct in6_addr *pfx;
7198f8ce
TG		 3138 struct inet6_ifaddr *ifa;
3139 struct net_device *dev;
55ebaef1
NT		 3140 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3141 u8 ifa_flags;
461d8837 3142 int err;
1da177e4 3143
461d8837
TG		 3144 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3145 if (err < 0)
3146 return err;
3147
3148 ifm = nlmsg_data(nlh);
3149 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3150 if (pfx == NULL)
3151 return -EINVAL;
3152
461d8837 3153 if (tb[IFA_CACHEINFO]) {
0778769d 3154 struct ifa_cacheinfo *ci;
461d8837
TG		 3155
3156 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3157 valid_lft = ci->ifa_valid;
461d8837
TG		 3158 preferred_lft = ci->ifa_prefered;
3159 } else {
3160 preferred_lft = INFINITY_LIFE_TIME;
3161 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3162 }
3163
af284937 3164 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3165 if (dev == NULL)
3166 return -ENODEV;
3167
55ebaef1 3168 /* We ignore other flags so far. */
3b9f9a1c 3169 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3170
1cab3da6 3171 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3172 if (ifa == NULL) {
3173 /*
3174 * It would be best to check for !NLM_F_CREATE here but
3175 * userspace alreay relies on not having to provide this.
3176 */
af284937
DL		 3177 return inet6_addr_add(net, ifm->ifa_index, pfx,
3178 ifm->ifa_prefixlen, ifa_flags,
3179 preferred_lft, valid_lft);
081bba5b
NT		 3180 }
3181
7198f8ce
TG		 3182 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3183 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3184 err = -EEXIST;
3185 else
55ebaef1 3186 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3187
3188 in6_ifa_put(ifa);
3189
3190 return err;
1da177e4
LT		 3191}
3192
101bb229
TG		 3193static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3194 u8 scope, int ifindex)
3195{
3196 struct ifaddrmsg *ifm;
3197
3198 ifm = nlmsg_data(nlh);
3199 ifm->ifa_family = AF_INET6;
3200 ifm->ifa_prefixlen = prefixlen;
3201 ifm->ifa_flags = flags;
3202 ifm->ifa_scope = scope;
3203 ifm->ifa_index = ifindex;
3204}
3205
85486af0
TG		 3206static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3207 unsigned long tstamp, u32 preferred, u32 valid)
3208{
3209 struct ifa_cacheinfo ci;
3210
3211 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3212 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3213 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3214 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3215 ci.ifa_prefered = preferred;
3216 ci.ifa_valid = valid;
3217
3218 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3219}
3220
101bb229
TG		 3221static inline int rt_scope(int ifa_scope)
3222{
3223 if (ifa_scope & IFA_HOST)
3224 return RT_SCOPE_HOST;
3225 else if (ifa_scope & IFA_LINK)
3226 return RT_SCOPE_LINK;
3227 else if (ifa_scope & IFA_SITE)
3228 return RT_SCOPE_SITE;
3229 else
3230 return RT_SCOPE_UNIVERSE;
3231}
3232
0ab6803b
TG		 3233static inline int inet6_ifaddr_msgsize(void)
3234{
339bf98f
TG		 3235 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3236 + nla_total_size(16) /* IFA_ADDRESS */
3237 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3238}
c5396a31 3239
1da177e4 3240static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3241 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3242{
1da177e4 3243 struct nlmsghdr *nlh;
85486af0 3244 u32 preferred, valid;
1da177e4 3245
0ab6803b
TG		 3246 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3247 if (nlh == NULL)
26932566 3248 return -EMSGSIZE;
0ab6803b 3249
101bb229
TG		 3250 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3251 ifa->idev->dev->ifindex);
3252
1da177e4 3253 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3254 preferred = ifa->prefered_lft;
3255 valid = ifa->valid_lft;
3256 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3257 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3258 preferred -= tval;
3259 if (valid != INFINITY_LIFE_TIME)
3260 valid -= tval;
1da177e4
LT		 3261 }
3262 } else {
85486af0
TG		 3263 preferred = INFINITY_LIFE_TIME;
3264 valid = INFINITY_LIFE_TIME;
3265 }
3266
0ab6803b 3267 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3268 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3269 nlmsg_cancel(skb, nlh);
3270 return -EMSGSIZE;
3271 }
1da177e4 3272
0ab6803b 3273 return nlmsg_end(skb, nlh);
1da177e4
LT		 3274}
3275
3276static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3277 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3278{
1da177e4 3279 struct nlmsghdr *nlh;
101bb229
TG		 3280 u8 scope = RT_SCOPE_UNIVERSE;
3281 int ifindex = ifmca->idev->dev->ifindex;
3282
3283 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3284 scope = RT_SCOPE_SITE;
1da177e4 3285
0ab6803b
TG		 3286 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3287 if (nlh == NULL)
26932566 3288 return -EMSGSIZE;
85486af0 3289
0ab6803b
TG		 3290 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3291 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3292 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3293 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3294 nlmsg_cancel(skb, nlh);
3295 return -EMSGSIZE;
3296 }
85486af0 3297
0ab6803b 3298 return nlmsg_end(skb, nlh);
1da177e4
LT		 3299}
3300
3301static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3302 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3303{
1da177e4 3304 struct nlmsghdr *nlh;
101bb229
TG		 3305 u8 scope = RT_SCOPE_UNIVERSE;
3306 int ifindex = ifaca->aca_idev->dev->ifindex;
3307
3308 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3309 scope = RT_SCOPE_SITE;
1da177e4 3310
0ab6803b
TG		 3311 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3312 if (nlh == NULL)
26932566 3313 return -EMSGSIZE;
85486af0 3314
0ab6803b
TG		 3315 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3316 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3317 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3318 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3319 nlmsg_cancel(skb, nlh);
3320 return -EMSGSIZE;
3321 }
1da177e4 3322
0ab6803b 3323 return nlmsg_end(skb, nlh);
1da177e4
LT		 3324}
3325
3326enum addr_type_t
3327{
3328 UNICAST_ADDR,
3329 MULTICAST_ADDR,
3330 ANYCAST_ADDR,
3331};
3332
3333static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3334 enum addr_type_t type)
3335{
3336 int idx, ip_idx;
3337 int s_idx, s_ip_idx;
3338 int err = 1;
3339 struct net_device *dev;
3340 struct inet6_dev *idev = NULL;
3341 struct inet6_ifaddr *ifa;
3342 struct ifmcaddr6 *ifmca;
3343 struct ifacaddr6 *ifaca;
3b1e0a65 3344 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3345
3346 s_idx = cb->args[0];
3347 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3348
7562f876 3349 idx = 0;
6fda7350 3350 for_each_netdev(net, dev) {
1da177e4 3351 if (idx < s_idx)
7562f876 3352 goto cont;
1da177e4
LT		 3353 if (idx > s_idx)
3354 s_ip_idx = 0;
3355 ip_idx = 0;
3356 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3357 goto cont;
1da177e4
LT		 3358 read_lock_bh(&idev->lock);
3359 switch (type) {
3360 case UNICAST_ADDR:
ae9cda5d 3361 /* unicast address incl. temp addr */
1da177e4
LT		 3362 for (ifa = idev->addr_list; ifa;
3363 ifa = ifa->if_next, ip_idx++) {
3364 if (ip_idx < s_ip_idx)
3365 continue;
5d5619b4
YH		 3366 err = inet6_fill_ifaddr(skb, ifa,
3367 NETLINK_CB(cb->skb).pid,
3368 cb->nlh->nlmsg_seq,
3369 RTM_NEWADDR,
3370 NLM_F_MULTI);
1da177e4 3371 }
1da177e4
LT		 3372 break;
3373 case MULTICAST_ADDR:
3374 /* multicast address */
1ab1457c 3375 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3376 ifmca = ifmca->next, ip_idx++) {
3377 if (ip_idx < s_ip_idx)
3378 continue;
5d5619b4
YH		 3379 err = inet6_fill_ifmcaddr(skb, ifmca,
3380 NETLINK_CB(cb->skb).pid,
3381 cb->nlh->nlmsg_seq,
3382 RTM_GETMULTICAST,
3383 NLM_F_MULTI);
1da177e4
LT		 3384 }
3385 break;
3386 case ANYCAST_ADDR:
3387 /* anycast address */
3388 for (ifaca = idev->ac_list; ifaca;
3389 ifaca = ifaca->aca_next, ip_idx++) {
3390 if (ip_idx < s_ip_idx)
3391 continue;
5d5619b4
YH		 3392 err = inet6_fill_ifacaddr(skb, ifaca,
3393 NETLINK_CB(cb->skb).pid,
3394 cb->nlh->nlmsg_seq,
3395 RTM_GETANYCAST,
3396 NLM_F_MULTI);
1da177e4
LT		 3397 }
3398 break;
3399 default:
3400 break;
3401 }
3402 read_unlock_bh(&idev->lock);
3403 in6_dev_put(idev);
5d5619b4
YH		 3404
3405 if (err <= 0)
3406 break;
7562f876
PE		 3407cont:
3408 idx++;
1da177e4 3409 }
1da177e4
LT		 3410 cb->args[0] = idx;
3411 cb->args[1] = ip_idx;
3412 return skb->len;
3413}
3414
3415static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3416{
3417 enum addr_type_t type = UNICAST_ADDR;
b854272b 3418
1da177e4
LT		 3419 return inet6_dump_addr(skb, cb, type);
3420}
3421
3422static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3423{
3424 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3425
1da177e4
LT		 3426 return inet6_dump_addr(skb, cb, type);
3427}
3428
3429
3430static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3431{
3432 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3433
1da177e4
LT		 3434 return inet6_dump_addr(skb, cb, type);
3435}
3436
1b29fc2c
TG		 3437static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3438 void *arg)
6c223828 3439{
3b1e0a65 3440 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3441 struct ifaddrmsg *ifm;
3442 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3443 struct in6_addr *addr = NULL;
3444 struct net_device *dev = NULL;
3445 struct inet6_ifaddr *ifa;
3446 struct sk_buff *skb;
6c223828
NT		 3447 int err;
3448
1b29fc2c
TG		 3449 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3450 if (err < 0)
3451 goto errout;
3452
3453 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3454 if (addr == NULL) {
3455 err = -EINVAL;
3456 goto errout;
6c223828 3457 }
6c223828 3458
1b29fc2c 3459 ifm = nlmsg_data(nlh);
6c223828 3460 if (ifm->ifa_index)
6fda7350 3461 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3462
1cab3da6 3463 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3464 err = -EADDRNOTAVAIL;
3465 goto errout;
3466 }
6c223828 3467
0ab6803b 3468 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3469 err = -ENOBUFS;
1b29fc2c 3470 goto errout_ifa;
6c223828
NT		 3471 }
3472
6c223828
NT		 3473 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3474 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3475 if (err < 0) {
3476 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3477 WARN_ON(err == -EMSGSIZE);
3478 kfree_skb(skb);
3479 goto errout_ifa;
3480 }
6fda7350 3481 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3482errout_ifa:
6c223828 3483 in6_ifa_put(ifa);
1b29fc2c 3484errout:
6c223828 3485 return err;
6c223828
NT		 3486}
3487
1da177e4
LT		 3488static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3489{
3490 struct sk_buff *skb;
c346dca1 3491 struct net *net = dev_net(ifa->idev->dev);
5d620266 3492 int err = -ENOBUFS;
1da177e4 3493
0ab6803b 3494 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3495 if (skb == NULL)
3496 goto errout;
3497
3498 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3499 if (err < 0) {
3500 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3501 WARN_ON(err == -EMSGSIZE);
3502 kfree_skb(skb);
3503 goto errout;
3504 }
6fda7350 3505 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3506errout:
3507 if (err < 0)
6fda7350 3508 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3509}
3510
b6f99a21 3511static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3512 __s32 *array, int bytes)
3513{
04561c1f
TG		 3514 BUG_ON(bytes < (DEVCONF_MAX * 4));
3515
1da177e4
LT		 3516 memset(array, 0, bytes);
3517 array[DEVCONF_FORWARDING] = cnf->forwarding;
3518 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3519 array[DEVCONF_MTU6] = cnf->mtu6;
3520 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3521 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3522 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3523 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3524 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3525 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3526 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3527 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3528#ifdef CONFIG_IPV6_PRIVACY
3529 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3530 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3531 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3532 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3533 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3534#endif
3535 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3536 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3537 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3538#ifdef CONFIG_IPV6_ROUTER_PREF
3539 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3540 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3541#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3542 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3543#endif
930d6ff2 3544#endif
fbea49e1 3545 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3546 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3547#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3548 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3549#endif
1da177e4
LT		 3550}
3551
339bf98f
TG		 3552static inline size_t inet6_if_nlmsg_size(void)
3553{
3554 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3555 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3556 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3557 + nla_total_size(4) /* IFLA_MTU */
3558 + nla_total_size(4) /* IFLA_LINK */
3559 + nla_total_size( /* IFLA_PROTINFO */
3560 nla_total_size(4) /* IFLA_INET6_FLAGS */
3561 + nla_total_size(sizeof(struct ifla_cacheinfo))
3562 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3563 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3564 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3565 );
3566}
c5396a31 3567
7f7d9a6b
HX		 3568static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3569 int bytes)
3570{
3571 int i;
3572 int pad = bytes - sizeof(u64) * items;
3573 BUG_ON(pad < 0);
3574
3575 /* Use put_unaligned() because stats may not be aligned for u64. */
3576 put_unaligned(items, &stats[0]);
3577 for (i = 1; i < items; i++)
3578 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3579
3580 memset(&stats[items], 0, pad);
3581}
3582
3583static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3584 int bytes)
3585{
3586 switch(attrtype) {
3587 case IFLA_INET6_STATS:
3588 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3589 break;
3590 case IFLA_INET6_ICMP6STATS:
3591 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3592 break;
3593 }
3594}
3595
1ab1457c 3596static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3597 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3598{
04561c1f 3599 struct net_device *dev = idev->dev;
bf99f1bd 3600 struct nlattr *nla;
04561c1f
TG		 3601 struct ifinfomsg *hdr;
3602 struct nlmsghdr *nlh;
3603 void *protoinfo;
3604 struct ifla_cacheinfo ci;
3605
3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3607 if (nlh == NULL)
26932566 3608 return -EMSGSIZE;
04561c1f
TG		 3609
3610 hdr = nlmsg_data(nlh);
3611 hdr->ifi_family = AF_INET6;
3612 hdr->__ifi_pad = 0;
3613 hdr->ifi_type = dev->type;
3614 hdr->ifi_index = dev->ifindex;
3615 hdr->ifi_flags = dev_get_flags(dev);
3616 hdr->ifi_change = 0;
3617
3618 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3619
3620 if (dev->addr_len)
04561c1f 3621 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3622
04561c1f 3623 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3624 if (dev->ifindex != dev->iflink)
04561c1f 3625 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3626
04561c1f
TG		 3627 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3628 if (protoinfo == NULL)
3629 goto nla_put_failure;
1da177e4 3630
04561c1f 3631 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3632
1da177e4
LT		 3633 ci.max_reasm_len = IPV6_MAXPLEN;
3634 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3635 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3636 ci.reachable_time = idev->nd_parms->reachable_time;
3637 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3638 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3639
bf99f1bd
YH		 3640 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3641 if (nla == NULL)
04561c1f 3642 goto nla_put_failure;
bf99f1bd 3643 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3644
bf99f1bd
YH		 3645 /* XXX - MC not implemented */
3646
3647 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3648 if (nla == NULL)
3649 goto nla_put_failure;
3650 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3651
3652 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3653 if (nla == NULL)
3654 goto nla_put_failure;
3655 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3656
04561c1f
TG		 3657 nla_nest_end(skb, protoinfo);
3658 return nlmsg_end(skb, nlh);
1da177e4 3659
04561c1f 3660nla_put_failure:
26932566
PM		 3661 nlmsg_cancel(skb, nlh);
3662 return -EMSGSIZE;
1da177e4
LT		 3663}
3664
3665static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3666{
3b1e0a65 3667 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3668 int idx, err;
3669 int s_idx = cb->args[0];
3670 struct net_device *dev;
3671 struct inet6_dev *idev;
3672
3673 read_lock(&dev_base_lock);
7562f876 3674 idx = 0;
6fda7350 3675 for_each_netdev(net, dev) {
1da177e4 3676 if (idx < s_idx)
7562f876 3677 goto cont;
1da177e4 3678 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3679 goto cont;
1ab1457c 3680 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3681 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3682 in6_dev_put(idev);
3683 if (err <= 0)
3684 break;
7562f876
PE		 3685cont:
3686 idx++;
1da177e4
LT		 3687 }
3688 read_unlock(&dev_base_lock);
3689 cb->args[0] = idx;
3690
3691 return skb->len;
3692}
3693
3694void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3695{
3696 struct sk_buff *skb;
c346dca1 3697 struct net *net = dev_net(idev->dev);
8d7a76c9 3698 int err = -ENOBUFS;
1ab1457c 3699
339bf98f 3700 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3701 if (skb == NULL)
3702 goto errout;
3703
3704 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3705 if (err < 0) {
3706 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3707 WARN_ON(err == -EMSGSIZE);
3708 kfree_skb(skb);
3709 goto errout;
3710 }
6fda7350 3711 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3712errout:
3713 if (err < 0)
6fda7350 3714 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3715}
3716
339bf98f
TG		 3717static inline size_t inet6_prefix_nlmsg_size(void)
3718{
3719 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3720 + nla_total_size(sizeof(struct in6_addr))
3721 + nla_total_size(sizeof(struct prefix_cacheinfo));
3722}
c5396a31 3723
1da177e4 3724static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3725 struct prefix_info *pinfo, u32 pid, u32 seq,
3726 int event, unsigned int flags)
1da177e4 3727{
6051e2f4
TG		 3728 struct prefixmsg *pmsg;
3729 struct nlmsghdr *nlh;
1da177e4
LT		 3730 struct prefix_cacheinfo ci;
3731
6051e2f4
TG		 3732 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3733 if (nlh == NULL)
26932566 3734 return -EMSGSIZE;
6051e2f4
TG		 3735
3736 pmsg = nlmsg_data(nlh);
1da177e4 3737 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3738 pmsg->prefix_pad1 = 0;
3739 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3740 pmsg->prefix_ifindex = idev->dev->ifindex;
3741 pmsg->prefix_len = pinfo->prefix_len;
3742 pmsg->prefix_type = pinfo->type;
8a47077a 3743 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3744 pmsg->prefix_flags = 0;
3745 if (pinfo->onlink)
3746 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3747 if (pinfo->autoconf)
3748 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3749
6051e2f4 3750 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3751
3752 ci.preferred_time = ntohl(pinfo->prefered);
3753 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3754 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3755
6051e2f4 3756 return nlmsg_end(skb, nlh);
1da177e4 3757
6051e2f4 3758nla_put_failure:
26932566
PM		 3759 nlmsg_cancel(skb, nlh);
3760 return -EMSGSIZE;
1da177e4
LT		 3761}
3762
1ab1457c 3763static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3764 struct prefix_info *pinfo)
3765{
3766 struct sk_buff *skb;
c346dca1 3767 struct net *net = dev_net(idev->dev);
8c384bfa 3768 int err = -ENOBUFS;
1da177e4 3769
339bf98f 3770 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3771 if (skb == NULL)
3772 goto errout;
3773
3774 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3775 if (err < 0) {
3776 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3777 WARN_ON(err == -EMSGSIZE);
3778 kfree_skb(skb);
3779 goto errout;
3780 }
6fda7350 3781 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3782errout:
3783 if (err < 0)
6fda7350 3784 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3785}
3786
1da177e4
LT		 3787static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3788{
3789 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3790
3791 switch (event) {
3792 case RTM_NEWADDR:
95c385b4
NH		 3793 /*
3794 * If the address was optimistic
3795 * we inserted the route at the start of
3796 * our DAD process, so we don't need
3797 * to do it again
3798 */
3799 if (!(ifp->rt->rt6i_node))
3800 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3801 if (ifp->idev->cnf.forwarding)
3802 addrconf_join_anycast(ifp);
3803 break;
3804 case RTM_DELADDR:
3805 if (ifp->idev->cnf.forwarding)
3806 addrconf_leave_anycast(ifp);
3807 addrconf_leave_solict(ifp->idev, &ifp->addr);
3808 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3809 if (ip6_del_rt(ifp->rt))
1da177e4 3810 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3811 break;
3812 }
3813}
3814
3815static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3816{
8814c4b5 3817 rcu_read_lock_bh();
1da177e4
LT		 3818 if (likely(ifp->idev->dead == 0))
3819 __ipv6_ifa_notify(event, ifp);
8814c4b5 3820 rcu_read_unlock_bh();
1da177e4
LT		 3821}
3822
3823#ifdef CONFIG_SYSCTL
3824
3825static
3826int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3827 void __user *buffer, size_t *lenp, loff_t *ppos)
3828{
3829 int *valp = ctl->data;
3830 int val = *valp;
3831 int ret;
3832
3833 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3834
c8fecf22
PE		 3835 if (write)
3836 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3837 return ret;
1da177e4
LT		 3838}
3839
1ab1457c 3840static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3841 int __user *name, int nlen,
3842 void __user *oldval,
3843 size_t __user *oldlenp,
1f29bcd7 3844 void __user *newval, size_t newlen)
1da177e4
LT		 3845{
3846 int *valp = table->data;
c8fecf22 3847 int val = *valp;
1da177e4
LT		 3848 int new;
3849
3850 if (!newval || !newlen)
3851 return 0;
3852 if (newlen != sizeof(int))
3853 return -EINVAL;
3854 if (get_user(new, (int __user *)newval))
3855 return -EFAULT;
3856 if (new == *valp)
3857 return 0;
3858 if (oldval && oldlenp) {
3859 size_t len;
3860 if (get_user(len, oldlenp))
3861 return -EFAULT;
3862 if (len) {
3863 if (len > table->maxlen)
3864 len = table->maxlen;
3865 if (copy_to_user(oldval, valp, len))
3866 return -EFAULT;
3867 if (put_user(len, oldlenp))
3868 return -EFAULT;
3869 }
3870 }
3871
c8fecf22
PE		 3872 *valp = new;
3873 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3874 return 1;
3875}
3876
3877static struct addrconf_sysctl_table
3878{
3879 struct ctl_table_header *sysctl_header;
3880 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3881 char *dev_name;
ab32ea5d 3882} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3883 .sysctl_header = NULL,
3884 .addrconf_vars = {
1ab1457c 3885 {
1da177e4
LT		 3886 .ctl_name = NET_IPV6_FORWARDING,
3887 .procname = "forwarding",
1ab1457c 3888 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3889 .maxlen = sizeof(int),
3890 .mode = 0644,
1ab1457c 3891 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3892 .strategy = &addrconf_sysctl_forward_strategy,
3893 },
3894 {
3895 .ctl_name = NET_IPV6_HOP_LIMIT,
3896 .procname = "hop_limit",
1ab1457c 3897 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3898 .maxlen = sizeof(int),
3899 .mode = 0644,
3900 .proc_handler = proc_dointvec,
3901 },
3902 {
3903 .ctl_name = NET_IPV6_MTU,
3904 .procname = "mtu",
3905 .data = &ipv6_devconf.mtu6,
1ab1457c 3906 .maxlen = sizeof(int),
1da177e4 3907 .mode = 0644,
1ab1457c 3908 .proc_handler = &proc_dointvec,
1da177e4
LT		 3909 },
3910 {
3911 .ctl_name = NET_IPV6_ACCEPT_RA,
3912 .procname = "accept_ra",
1ab1457c 3913 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3914 .maxlen = sizeof(int),
3915 .mode = 0644,
1ab1457c 3916 .proc_handler = &proc_dointvec,
1da177e4
LT		 3917 },
3918 {
3919 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3920 .procname = "accept_redirects",
1ab1457c 3921 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3922 .maxlen = sizeof(int),
3923 .mode = 0644,
1ab1457c 3924 .proc_handler = &proc_dointvec,
1da177e4
LT		 3925 },
3926 {
3927 .ctl_name = NET_IPV6_AUTOCONF,
3928 .procname = "autoconf",
1ab1457c 3929 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3930 .maxlen = sizeof(int),
3931 .mode = 0644,
1ab1457c 3932 .proc_handler = &proc_dointvec,
1da177e4
LT		 3933 },
3934 {
3935 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3936 .procname = "dad_transmits",
1ab1457c 3937 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3938 .maxlen = sizeof(int),
3939 .mode = 0644,
1ab1457c 3940 .proc_handler = &proc_dointvec,
1da177e4
LT		 3941 },
3942 {
3943 .ctl_name = NET_IPV6_RTR_SOLICITS,
3944 .procname = "router_solicitations",
1ab1457c 3945 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3946 .maxlen = sizeof(int),
3947 .mode = 0644,
1ab1457c 3948 .proc_handler = &proc_dointvec,
1da177e4
LT		 3949 },
3950 {
3951 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3952 .procname = "router_solicitation_interval",
1ab1457c 3953 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3954 .maxlen = sizeof(int),
3955 .mode = 0644,
1ab1457c 3956 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3957 .strategy = &sysctl_jiffies,
3958 },
3959 {
3960 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3961 .procname = "router_solicitation_delay",
1ab1457c 3962 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3963 .maxlen = sizeof(int),
3964 .mode = 0644,
1ab1457c 3965 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3966 .strategy = &sysctl_jiffies,
3967 },
3968 {
3969 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3970 .procname = "force_mld_version",
1ab1457c 3971 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3972 .maxlen = sizeof(int),
3973 .mode = 0644,
1ab1457c 3974 .proc_handler = &proc_dointvec,
1da177e4
LT		 3975 },
3976#ifdef CONFIG_IPV6_PRIVACY
3977 {
3978 .ctl_name = NET_IPV6_USE_TEMPADDR,
3979 .procname = "use_tempaddr",
1ab1457c 3980 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3981 .maxlen = sizeof(int),
3982 .mode = 0644,
1ab1457c 3983 .proc_handler = &proc_dointvec,
1da177e4
LT		 3984 },
3985 {
3986 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3987 .procname = "temp_valid_lft",
1ab1457c 3988 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3989 .maxlen = sizeof(int),
3990 .mode = 0644,
1ab1457c 3991 .proc_handler = &proc_dointvec,
1da177e4
LT		 3992 },
3993 {
3994 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3995 .procname = "temp_prefered_lft",
1ab1457c 3996 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3997 .maxlen = sizeof(int),
3998 .mode = 0644,
1ab1457c 3999 .proc_handler = &proc_dointvec,
1da177e4
LT		 4000 },
4001 {
4002 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4003 .procname = "regen_max_retry",
1ab1457c 4004 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4005 .maxlen = sizeof(int),
4006 .mode = 0644,
1ab1457c 4007 .proc_handler = &proc_dointvec,
1da177e4
LT		 4008 },
4009 {
4010 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4011 .procname = "max_desync_factor",
1ab1457c 4012 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4013 .maxlen = sizeof(int),
4014 .mode = 0644,
1ab1457c 4015 .proc_handler = &proc_dointvec,
1da177e4
LT		 4016 },
4017#endif
4018 {
4019 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4020 .procname = "max_addresses",
4021 .data = &ipv6_devconf.max_addresses,
4022 .maxlen = sizeof(int),
4023 .mode = 0644,
4024 .proc_handler = &proc_dointvec,
4025 },
65f5c7c1
YH		 4026 {
4027 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4028 .procname = "accept_ra_defrtr",
1ab1457c 4029 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4030 .maxlen = sizeof(int),
4031 .mode = 0644,
1ab1457c 4032 .proc_handler = &proc_dointvec,
65f5c7c1 4033 },
c4fd30eb
YH		 4034 {
4035 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4036 .procname = "accept_ra_pinfo",
1ab1457c 4037 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4038 .maxlen = sizeof(int),
4039 .mode = 0644,
1ab1457c 4040 .proc_handler = &proc_dointvec,
c4fd30eb 4041 },
930d6ff2
YH		 4042#ifdef CONFIG_IPV6_ROUTER_PREF
4043 {
4044 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4045 .procname = "accept_ra_rtr_pref",
4046 .data = &ipv6_devconf.accept_ra_rtr_pref,
4047 .maxlen = sizeof(int),
4048 .mode = 0644,
4049 .proc_handler = &proc_dointvec,
4050 },
52e16356
YH		 4051 {
4052 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4053 .procname = "router_probe_interval",
4054 .data = &ipv6_devconf.rtr_probe_interval,
4055 .maxlen = sizeof(int),
4056 .mode = 0644,
4057 .proc_handler = &proc_dointvec_jiffies,
4058 .strategy = &sysctl_jiffies,
4059 },
fa03ef38 4060#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4061 {
4062 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4063 .procname = "accept_ra_rt_info_max_plen",
4064 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4065 .maxlen = sizeof(int),
4066 .mode = 0644,
4067 .proc_handler = &proc_dointvec,
4068 },
4069#endif
930d6ff2 4070#endif
fbea49e1
YH		 4071 {
4072 .ctl_name = NET_IPV6_PROXY_NDP,
4073 .procname = "proxy_ndp",
4074 .data = &ipv6_devconf.proxy_ndp,
4075 .maxlen = sizeof(int),
4076 .mode = 0644,
4077 .proc_handler = &proc_dointvec,
4078 },
0bcbc926
YH		 4079 {
4080 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4081 .procname = "accept_source_route",
4082 .data = &ipv6_devconf.accept_source_route,
4083 .maxlen = sizeof(int),
4084 .mode = 0644,
4085 .proc_handler = &proc_dointvec,
4086 },
95c385b4
NH		 4087#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4088 {
4089 .ctl_name = CTL_UNNUMBERED,
4090 .procname = "optimistic_dad",
4091 .data = &ipv6_devconf.optimistic_dad,
4092 .maxlen = sizeof(int),
4093 .mode = 0644,
4094 .proc_handler = &proc_dointvec,
4095
4096 },
4097#endif
1da177e4
LT		 4098 {
4099 .ctl_name = 0, /* sentinel */
4100 }
4101 },
1da177e4
LT		 4102};
4103
bff16c2f
PE		 4104static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4105 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4106{
4107 int i;
1da177e4 4108 struct addrconf_sysctl_table *t;
1da177e4 4109
1dab6222
PE		 4110#define ADDRCONF_CTL_PATH_DEV 3
4111
4112 struct ctl_path addrconf_ctl_path[] = {
4113 { .procname = "net", .ctl_name = CTL_NET, },
4114 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4115 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4116 { /* to be set */ },
4117 { },
4118 };
4119
4120
af879cc7 4121 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4122 if (t == NULL)
f68635e6
PE		 4123 goto out;
4124
1da177e4
LT		 4125 for (i=0; t->addrconf_vars[i].data; i++) {
4126 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4127 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4128 t->addrconf_vars[i].extra2 = net;
1da177e4 4129 }
1da177e4 4130
1ab1457c
YH		 4131 /*
4132 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4133 * by sysctl and we wouldn't want anyone to change it under our feet
4134 * (see SIOCSIFNAME).
1ab1457c 4135 */
1dab6222
PE		 4136 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4137 if (!t->dev_name)
f68635e6 4138 goto free;
1da177e4 4139
1dab6222
PE		 4140 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4141 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4142
bff16c2f 4143 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4144 t->addrconf_vars);
1da177e4
LT		 4145 if (t->sysctl_header == NULL)
4146 goto free_procname;
f68635e6
PE		 4147
4148 p->sysctl = t;
95897312 4149 return 0;
1da177e4 4150
f68635e6 4151free_procname:
1dab6222 4152 kfree(t->dev_name);
f68635e6 4153free:
1da177e4 4154 kfree(t);
f68635e6 4155out:
95897312 4156 return -ENOBUFS;
1da177e4
LT		 4157}
4158
408c4768
PE		 4159static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4160{
4161 struct addrconf_sysctl_table *t;
4162
4163 if (p->sysctl == NULL)
4164 return;
4165
4166 t = p->sysctl;
4167 p->sysctl = NULL;
4168 unregister_sysctl_table(t->sysctl_header);
4169 kfree(t->dev_name);
4170 kfree(t);
4171}
4172
f52295a9
PE		 4173static void addrconf_sysctl_register(struct inet6_dev *idev)
4174{
408c4768
PE		 4175 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4176 NET_IPV6_NEIGH, "ipv6",
4177 &ndisc_ifinfo_sysctl_change,
4178 NULL);
c346dca1 4179 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4180 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4181}
4182
408c4768 4183static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4184{
408c4768
PE		 4185 __addrconf_sysctl_unregister(&idev->cnf);
4186 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4187}
4188
4189
4190#endif
4191
e0da5a48
PE		 4192static int addrconf_init_net(struct net *net)
4193{
4194 int err;
4195 struct ipv6_devconf *all, *dflt;
4196
4197 err = -ENOMEM;
4198 all = &ipv6_devconf;
4199 dflt = &ipv6_devconf_dflt;
4200
4201 if (net != &init_net) {
4202 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4203 if (all == NULL)
4204 goto err_alloc_all;
4205
4206 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4207 if (dflt == NULL)
4208 goto err_alloc_dflt;
4209 }
4210
4211 net->ipv6.devconf_all = all;
4212 net->ipv6.devconf_dflt = dflt;
4213
4214#ifdef CONFIG_SYSCTL
4215 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4216 NULL, all);
4217 if (err < 0)
4218 goto err_reg_all;
4219
4220 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4221 NULL, dflt);
4222 if (err < 0)
4223 goto err_reg_dflt;
4224#endif
4225 return 0;
4226
4227#ifdef CONFIG_SYSCTL
4228err_reg_dflt:
4229 __addrconf_sysctl_unregister(all);
4230err_reg_all:
4231 kfree(dflt);
4232#endif
4233err_alloc_dflt:
4234 kfree(all);
4235err_alloc_all:
4236 return err;
4237}
4238
4239static void addrconf_exit_net(struct net *net)
4240{
4241#ifdef CONFIG_SYSCTL
4242 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4243 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4244#endif
4245 if (net != &init_net) {
4246 kfree(net->ipv6.devconf_dflt);
4247 kfree(net->ipv6.devconf_all);
4248 }
4249}
4250
4251static struct pernet_operations addrconf_ops = {
4252 .init = addrconf_init_net,
4253 .exit = addrconf_exit_net,
4254};
4255
1da177e4
LT		 4256/*
4257 * Device notifier
4258 */
4259
4260int register_inet6addr_notifier(struct notifier_block *nb)
4261{
1ab1457c 4262 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4263}
4264
7159039a
YH		 4265EXPORT_SYMBOL(register_inet6addr_notifier);
4266
1da177e4
LT		 4267int unregister_inet6addr_notifier(struct notifier_block *nb)
4268{
1ab1457c 4269 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4270}
4271
7159039a
YH		 4272EXPORT_SYMBOL(unregister_inet6addr_notifier);
4273
af284937
DL		 4274
4275static int addrconf_net_init(struct net *net)
4276{
4277 return 0;
4278}
4279
4280static void addrconf_net_exit(struct net *net)
4281{
6fda7350
BT		 4282 struct net_device *dev;
4283
6fda7350
BT		 4284 rtnl_lock();
4285 /* clean dev list */
4286 for_each_netdev(net, dev) {
4287 if (__in6_dev_get(dev) == NULL)
4288 continue;
4289 addrconf_ifdown(dev, 1);
4290 }
4291 addrconf_ifdown(net->loopback_dev, 2);
4292 rtnl_unlock();
af284937
DL		 4293}
4294
4295static struct pernet_operations addrconf_net_ops = {
4296 .init = addrconf_net_init,
4297 .exit = addrconf_net_exit,
4298};
4299
1da177e4
LT		 4300/*
4301 * Init / cleanup code
4302 */
4303
4304int __init addrconf_init(void)
4305{
2a8cc6c8
YH		 4306 int err;
4307
4308 if ((err = ipv6_addr_label_init()) < 0) {
4309 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4310 err);
4311 return err;
4312 }
1da177e4 4313
e0da5a48
PE		 4314 register_pernet_subsys(&addrconf_ops);
4315
1da177e4
LT		 4316 /* The addrconf netdev notifier requires that loopback_dev
4317 * has it's ipv6 private information allocated and setup
4318 * before it can bring up and give link-local addresses
4319 * to other devices which are up.
4320 *
4321 * Unfortunately, loopback_dev is not necessarily the first
4322 * entry in the global dev_base list of net devices. In fact,
4323 * it is likely to be the very last entry on that list.
4324 * So this causes the notifier registry below to try and
4325 * give link-local addresses to all devices besides loopback_dev
4326 * first, then loopback_dev, which cases all the non-loopback_dev
4327 * devices to fail to get a link-local address.
4328 *
4329 * So, as a temporary fix, allocate the ipv6 structure for
4330 * loopback_dev first by hand.
4331 * Longer term, all of the dependencies ipv6 has upon the loopback
4332 * device and it being up should be removed.
4333 */
4334 rtnl_lock();
2774c7ab 4335 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4336 err = -ENOMEM;
4337 rtnl_unlock();
4338 if (err)
e0da5a48 4339 goto errlo;
1da177e4 4340
af284937
DL		 4341 err = register_pernet_device(&addrconf_net_ops);
4342 if (err)
4343 return err;
4344
1da177e4
LT		 4345 register_netdevice_notifier(&ipv6_dev_notf);
4346
1da177e4 4347 addrconf_verify(0);
c127ea2c
TG		 4348
4349 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4350 if (err < 0)
4351 goto errout;
4352
4353 /* Only the first call to __rtnl_register can fail */
4354 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4355 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4356 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4357 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4358 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4359
2a8cc6c8
YH		 4360 ipv6_addr_label_rtnl_register();
4361
1da177e4 4362 return 0;
c127ea2c
TG		 4363errout:
4364 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4365errlo:
4366 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4367
4368 return err;
1da177e4
LT		 4369}
4370
09f7709f 4371void addrconf_cleanup(void)
1da177e4 4372{
1ab1457c 4373 struct inet6_ifaddr *ifa;
1da177e4
LT		 4374 int i;
4375
4376 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4377 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4378
e0da5a48 4379 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4380
4381 rtnl_lock();
4382
1da177e4
LT		 4383 /*
4384 * Check hash table.
4385 */
1da177e4
LT		 4386 write_lock_bh(&addrconf_hash_lock);
4387 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4388 for (ifa=inet6_addr_lst[i]; ifa; ) {
4389 struct inet6_ifaddr *bifa;
4390
4391 bifa = ifa;
4392 ifa = ifa->lst_next;
4393 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4394 /* Do not free it; something is wrong.
4395 Now we can investigate it with debugger.
4396 */
4397 }
4398 }
4399 write_unlock_bh(&addrconf_hash_lock);
4400
4401 del_timer(&addr_chk_timer);
1da177e4 4402 rtnl_unlock();
af284937
DL		 4403
4404 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4405}
Linux kernel - Deliverables
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