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fib_hash: fix rcu sparse and logical errors
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 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
e21e8467 85#include <linux/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
e21e8467 101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 102
b2db7564
YH		 103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
1da177e4 107#ifdef CONFIG_SYSCTL
f52295a9 108static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
1da177e4
LT		 118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 123static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 124#endif
125
1b34be74 126static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 127static int ipv6_count_addresses(struct inet6_dev *idev);
128
129/*
130 * Configured unicast address hash table
131 */
c2e21293 132static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 133static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 134
1da177e4
LT		 135static void addrconf_verify(unsigned long);
136
8d06afab 137static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 138static DEFINE_SPINLOCK(addrconf_verify_lock);
139
140static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
141static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
142
93d9b7d7
JP		 143static void addrconf_type_change(struct net_device *dev,
144 unsigned long event);
1da177e4
LT		 145static int addrconf_ifdown(struct net_device *dev, int how);
146
e431b8c0 147static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 148static void addrconf_dad_timer(unsigned long data);
149static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 150static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 151static void addrconf_rs_timer(unsigned long data);
152static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
153static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
154
1ab1457c 155static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 156 struct prefix_info *pinfo);
3e81c6da
DM		 157static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
158 struct net_device *dev);
1da177e4 159
e041c683 160static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 161
888c848e 162static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 163 .forwarding = 0,
164 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
165 .mtu6 = IPV6_MIN_MTU,
166 .accept_ra = 1,
167 .accept_redirects = 1,
168 .autoconf = 1,
169 .force_mld_version = 0,
170 .dad_transmits = 1,
171 .rtr_solicits = MAX_RTR_SOLICITATIONS,
172 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
173 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
174#ifdef CONFIG_IPV6_PRIVACY
175 .use_tempaddr = 0,
176 .temp_valid_lft = TEMP_VALID_LIFETIME,
177 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
178 .regen_max_retry = REGEN_MAX_RETRY,
179 .max_desync_factor = MAX_DESYNC_FACTOR,
180#endif
181 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 182 .accept_ra_defrtr = 1,
c4fd30eb 183 .accept_ra_pinfo = 1,
930d6ff2
YH		 184#ifdef CONFIG_IPV6_ROUTER_PREF
185 .accept_ra_rtr_pref = 1,
52e16356 186 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 187#ifdef CONFIG_IPV6_ROUTE_INFO
188 .accept_ra_rt_info_max_plen = 0,
189#endif
930d6ff2 190#endif
fbea49e1 191 .proxy_ndp = 0,
0bcbc926 192 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 193 .disable_ipv6 = 0,
1b34be74 194 .accept_dad = 1,
1da177e4
LT		 195};
196
ab32ea5d 197static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .dad_transmits = 1,
205 .rtr_solicits = MAX_RTR_SOLICITATIONS,
206 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
207 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
208#ifdef CONFIG_IPV6_PRIVACY
209 .use_tempaddr = 0,
210 .temp_valid_lft = TEMP_VALID_LIFETIME,
211 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
212 .regen_max_retry = REGEN_MAX_RETRY,
213 .max_desync_factor = MAX_DESYNC_FACTOR,
214#endif
215 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 216 .accept_ra_defrtr = 1,
c4fd30eb 217 .accept_ra_pinfo = 1,
930d6ff2
YH		 218#ifdef CONFIG_IPV6_ROUTER_PREF
219 .accept_ra_rtr_pref = 1,
52e16356 220 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 221#ifdef CONFIG_IPV6_ROUTE_INFO
222 .accept_ra_rt_info_max_plen = 0,
223#endif
930d6ff2 224#endif
fbea49e1 225 .proxy_ndp = 0,
0bcbc926 226 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 227 .disable_ipv6 = 0,
1b34be74 228 .accept_dad = 1,
1da177e4
LT		 229};
230
231/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 232const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 233const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 234const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
235const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 236
f24e3d65 237/* Check if a valid qdisc is available */
05297949 238static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 239{
05297949 240 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 241}
242
2b5ead46
YH		 243/* Check if a route is valid prefix route */
244static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
245{
a02cec21 246 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 247}
248
1da177e4
LT		 249static void addrconf_del_timer(struct inet6_ifaddr *ifp)
250{
251 if (del_timer(&ifp->timer))
252 __in6_ifa_put(ifp);
253}
254
e21e8467 255enum addrconf_timer_t {
1da177e4
LT		 256 AC_NONE,
257 AC_DAD,
258 AC_RS,
259};
260
261static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
262 enum addrconf_timer_t what,
263 unsigned long when)
264{
265 if (!del_timer(&ifp->timer))
266 in6_ifa_hold(ifp);
267
268 switch (what) {
269 case AC_DAD:
270 ifp->timer.function = addrconf_dad_timer;
271 break;
272 case AC_RS:
273 ifp->timer.function = addrconf_rs_timer;
274 break;
e21e8467
SH		 275 default:
276 break;
1da177e4
LT		 277 }
278 ifp->timer.expires = jiffies + when;
279 add_timer(&ifp->timer);
280}
281
7f7d9a6b
HX		 282static int snmp6_alloc_dev(struct inet6_dev *idev)
283{
7d720c3e 284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 285 sizeof(struct ipstats_mib),
286 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 287 goto err_ip;
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
1823e4c8
ED		 289 sizeof(struct icmpv6_mib),
290 __alignof__(struct icmpv6_mib)) < 0)
7f7d9a6b 291 goto err_icmp;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
1823e4c8
ED		 293 sizeof(struct icmpv6msg_mib),
294 __alignof__(struct icmpv6msg_mib)) < 0)
14878f75 295 goto err_icmpmsg;
7f7d9a6b
HX		 296
297 return 0;
298
14878f75 299err_icmpmsg:
7d720c3e 300 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 301err_icmp:
7d720c3e 302 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 303err_ip:
aaf70ec7 304 return -ENOMEM;
7f7d9a6b
HX		 305}
306
16910b98 307static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 308{
7d720c3e
TH		 309 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
310 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 312}
313
1da177e4
LT		 314/* Nobody refers to this device, we may destroy it. */
315
8814c4b5
YH		 316static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
317{
318 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
319 kfree(idev);
320}
321
1da177e4
LT		 322void in6_dev_finish_destroy(struct inet6_dev *idev)
323{
324 struct net_device *dev = idev->dev;
547b792c 325
502a2ffd 326 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 327 WARN_ON(idev->mc_list != NULL);
328
1da177e4
LT		 329#ifdef NET_REFCNT_DEBUG
330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
331#endif
332 dev_put(dev);
333 if (!idev->dead) {
e21e8467 334 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 335 return;
336 }
337 snmp6_free_dev(idev);
8814c4b5 338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 339}
340
7159039a
YH		 341EXPORT_SYMBOL(in6_dev_finish_destroy);
342
1da177e4
LT		 343static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
344{
345 struct inet6_dev *ndev;
346
347 ASSERT_RTNL();
348
349 if (dev->mtu < IPV6_MIN_MTU)
350 return NULL;
351
1ab1457c 352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 353
1ab1457c
YH		 354 if (ndev == NULL)
355 return NULL;
322f74a4
IO		 356
357 rwlock_init(&ndev->lock);
358 ndev->dev = dev;
502a2ffd 359 INIT_LIST_HEAD(&ndev->addr_list);
360
c346dca1 361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 362 ndev->cnf.mtu6 = dev->mtu;
363 ndev->cnf.sysctl = NULL;
364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365 if (ndev->nd_parms == NULL) {
366 kfree(ndev);
367 return NULL;
368 }
0187bdfb
BH		 369 if (ndev->cnf.forwarding)
370 dev_disable_lro(dev);
322f74a4
IO		 371 /* We refer to the device */
372 dev_hold(dev);
1da177e4 373
322f74a4
IO		 374 if (snmp6_alloc_dev(ndev) < 0) {
375 ADBG((KERN_WARNING
376 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 377 __func__, dev->name));
322f74a4
IO		 378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
379 ndev->dead = 1;
380 in6_dev_finish_destroy(ndev);
381 return NULL;
382 }
1da177e4 383
322f74a4
IO		 384 if (snmp6_register_dev(ndev) < 0) {
385 ADBG((KERN_WARNING
386 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 387 __func__, dev->name));
322f74a4
IO		 388 neigh_parms_release(&nd_tbl, ndev->nd_parms);
389 ndev->dead = 1;
390 in6_dev_finish_destroy(ndev);
391 return NULL;
392 }
393
394 /* One reference from device. We must do this before
395 * we invoke __ipv6_regen_rndid().
396 */
397 in6_dev_hold(ndev);
1da177e4 398
1b34be74
YH		 399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400 ndev->cnf.accept_dad = -1;
401
b077d7ab
YH		 402#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
404 printk(KERN_INFO
405 "%s: Disabled Multicast RS\n",
406 dev->name);
407 ndev->cnf.rtr_solicits = 0;
408 }
409#endif
410
1da177e4 411#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 412 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
9625ed72 416 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 417 dev->type == ARPHRD_SIT ||
0be669bb 418 dev->type == ARPHRD_NONE) {
322f74a4
IO		 419 printk(KERN_INFO
420 "%s: Disabled Privacy Extensions\n",
421 dev->name);
422 ndev->cnf.use_tempaddr = -1;
423 } else {
424 in6_dev_hold(ndev);
425 ipv6_regen_rndid((unsigned long) ndev);
426 }
1da177e4
LT		 427#endif
428
f24e3d65 429 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 430 ndev->if_flags |= IF_READY;
431
322f74a4
IO		 432 ipv6_mc_init_dev(ndev);
433 ndev->tstamp = jiffies;
f52295a9 434 addrconf_sysctl_register(ndev);
30c4cf57
DS		 435 /* protected by rtnl_lock */
436 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 437
438 /* Join all-node multicast group */
f3ee4010 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 440
1da177e4
LT		 441 return ndev;
442}
443
cee89473 444static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 445{
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
e21e8467
SH		 450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
1da177e4
LT		 454 return NULL;
455 }
c5e33bdd 456
1da177e4
LT		 457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460}
461
462#ifdef CONFIG_SYSCTL
463static void dev_forward_change(struct inet6_dev *idev)
464{
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
1da177e4
LT		 467
468 if (!idev)
469 return;
470 dev = idev->dev;
0187bdfb
BH		 471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
1da177e4 473 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 474 if (idev->cnf.forwarding)
f3ee4010 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 476 else
f3ee4010 477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 478 }
502a2ffd 479
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 481 if (ifa->flags&IFA_F_TENTATIVE)
482 continue;
1da177e4
LT		 483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
485 else
486 addrconf_leave_anycast(ifa);
487 }
488}
489
490
e186932b 491static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 492{
493 struct net_device *dev;
494 struct inet6_dev *idev;
495
c6d14c84
ED		 496 rcu_read_lock();
497 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 498 idev = __in6_dev_get(dev);
499 if (idev) {
e186932b
PE		 500 int changed = (!idev->cnf.forwarding) ^ (!newf);
501 idev->cnf.forwarding = newf;
1da177e4
LT		 502 if (changed)
503 dev_forward_change(idev);
504 }
1da177e4 505 }
c6d14c84 506 rcu_read_unlock();
1da177e4 507}
c8fecf22 508
b325fddb 509static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 510{
bff16c2f
PE		 511 struct net *net;
512
513 net = (struct net *)table->extra2;
441fc2a2 514 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 515 return 0;
516
88af182e
EB		 517 if (!rtnl_trylock()) {
518 /* Restore the original values before restarting */
519 *p = old;
5007392d 520 return restart_syscall();
88af182e 521 }
c8fecf22 522
e186932b
PE		 523 if (p == &net->ipv6.devconf_all->forwarding) {
524 __s32 newf = net->ipv6.devconf_all->forwarding;
525 net->ipv6.devconf_dflt->forwarding = newf;
526 addrconf_forward_change(net, newf);
c8fecf22
PE		 527 } else if ((!*p) ^ (!old))
528 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 529 rtnl_unlock();
c8fecf22
PE		 530
531 if (*p)
7b4da532 532 rt6_purge_dflt_routers(net);
b325fddb 533 return 1;
c8fecf22 534}
1da177e4
LT		 535#endif
536
5c578aed 537static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
538{
539 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
540 kfree(ifp);
541}
1da177e4 542
5c578aed 543/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 544void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
545{
c2e21293 546 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 547
1da177e4
LT		 548#ifdef NET_REFCNT_DEBUG
549 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
550#endif
551
552 in6_dev_put(ifp->idev);
553
554 if (del_timer(&ifp->timer))
e21e8467 555 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 556
e9d3e084 557 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 558 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 559 return;
560 }
d8d1f30b 561 dst_release(&ifp->rt->dst);
1da177e4 562
5c578aed 563 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 564}
565
e55ffac6
BH		 566static void
567ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
568{
502a2ffd 569 struct list_head *p;
8a6ce0c0 570 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 571
572 /*
573 * Each device address list is sorted in order of scope -
574 * global before linklocal.
575 */
502a2ffd 576 list_for_each(p, &idev->addr_list) {
577 struct inet6_ifaddr *ifa
578 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 579 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 580 break;
581 }
582
b54c9b98 583 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 584}
585
3a88a81d 586static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 587{
3eb84f49
YH		 588 /*
589 * We perform the hash function over the last 64 bits of the address
590 * This will include the IEEE address token on links that support it.
591 */
0eae88f3
ED		 592 return jhash_2words((__force u32)addr->s6_addr32[2],
593 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 594 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 595}
596
1da177e4
LT		 597/* On success it returns ifp with increased reference count */
598
599static struct inet6_ifaddr *
600ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 601 int scope, u32 flags)
1da177e4
LT		 602{
603 struct inet6_ifaddr *ifa = NULL;
604 struct rt6_info *rt;
3a88a81d 605 unsigned int hash;
1da177e4 606 int err = 0;
d68b8270
YH		 607 int addr_type = ipv6_addr_type(addr);
608
609 if (addr_type == IPV6_ADDR_ANY ||
610 addr_type & IPV6_ADDR_MULTICAST ||
611 (!(idev->dev->flags & IFF_LOOPBACK) &&
612 addr_type & IPV6_ADDR_LOOPBACK))
613 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 614
8814c4b5 615 rcu_read_lock_bh();
1da177e4
LT		 616 if (idev->dead) {
617 err = -ENODEV; /*XXX*/
618 goto out2;
619 }
620
56d417b1 621 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 622 err = -EACCES;
623 goto out2;
624 }
625
5c578aed 626 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 627
628 /* Ignore adding duplicate addresses on an interface */
c346dca1 629 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 630 ADBG(("ipv6_add_addr: already assigned\n"));
631 err = -EEXIST;
632 goto out;
633 }
634
322f74a4 635 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 636
637 if (ifa == NULL) {
638 ADBG(("ipv6_add_addr: malloc failed\n"));
639 err = -ENOBUFS;
640 goto out;
641 }
642
643 rt = addrconf_dst_alloc(idev, addr, 0);
644 if (IS_ERR(rt)) {
645 err = PTR_ERR(rt);
646 goto out;
647 }
648
1da177e4
LT		 649 ipv6_addr_copy(&ifa->addr, addr);
650
651 spin_lock_init(&ifa->lock);
e9d3e084 652 spin_lock_init(&ifa->state_lock);
1da177e4 653 init_timer(&ifa->timer);
c2e21293 654 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 655 ifa->timer.data = (unsigned long) ifa;
656 ifa->scope = scope;
657 ifa->prefix_len = pfxlen;
658 ifa->flags = flags | IFA_F_TENTATIVE;
659 ifa->cstamp = ifa->tstamp = jiffies;
660
57f5f544
KF		 661 ifa->rt = rt;
662
95c385b4
NH		 663 /*
664 * part one of RFC 4429, section 3.3
665 * We should not configure an address as
666 * optimistic if we do not yet know the link
667 * layer address of our nexhop router
668 */
669
670 if (rt->rt6i_nexthop == NULL)
671 ifa->flags &= ~IFA_F_OPTIMISTIC;
672
1da177e4
LT		 673 ifa->idev = idev;
674 in6_dev_hold(idev);
675 /* For caller */
676 in6_ifa_hold(ifa);
677
678 /* Add to big hash table */
679 hash = ipv6_addr_hash(addr);
680
5c578aed 681 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 682 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 683
684 write_lock(&idev->lock);
685 /* Add to inet6_dev unicast addr list. */
e55ffac6 686 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 687
688#ifdef CONFIG_IPV6_PRIVACY
689 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 690 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 691 in6_ifa_hold(ifa);
692 }
693#endif
694
1da177e4
LT		 695 in6_ifa_hold(ifa);
696 write_unlock(&idev->lock);
697out2:
8814c4b5 698 rcu_read_unlock_bh();
1da177e4 699
fd92833a 700 if (likely(err == 0))
e041c683 701 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 702 else {
703 kfree(ifa);
704 ifa = ERR_PTR(err);
705 }
706
707 return ifa;
708out:
5c578aed 709 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 710 goto out2;
711}
712
713/* This function wants to get referenced ifp and releases it before return */
714
715static void ipv6_del_addr(struct inet6_ifaddr *ifp)
716{
502a2ffd 717 struct inet6_ifaddr *ifa, *ifn;
1da177e4 718 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 719 int state;
1da177e4
LT		 720 int hash;
721 int deleted = 0, onlink = 0;
722 unsigned long expires = jiffies;
723
724 hash = ipv6_addr_hash(&ifp->addr);
725
4c5ff6a6
HX		 726 spin_lock_bh(&ifp->state_lock);
727 state = ifp->state;
e9d3e084 728 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 729 spin_unlock_bh(&ifp->state_lock);
730
731 if (state == INET6_IFADDR_STATE_DEAD)
732 goto out;
1da177e4 733
5c578aed 734 spin_lock_bh(&addrconf_hash_lock);
735 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 736 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 737
738 write_lock_bh(&idev->lock);
739#ifdef CONFIG_IPV6_PRIVACY
740 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 741 list_del(&ifp->tmp_list);
742 if (ifp->ifpub) {
743 in6_ifa_put(ifp->ifpub);
744 ifp->ifpub = NULL;
1da177e4 745 }
372e6c8f 746 __in6_ifa_put(ifp);
1da177e4
LT		 747 }
748#endif
749
502a2ffd 750 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 751 if (ifa == ifp) {
502a2ffd 752 list_del_init(&ifp->if_list);
1da177e4 753 __in6_ifa_put(ifp);
502a2ffd 754
1da177e4
LT		 755 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
756 break;
757 deleted = 1;
1d142804 758 continue;
1da177e4
LT		 759 } else if (ifp->flags & IFA_F_PERMANENT) {
760 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
761 ifp->prefix_len)) {
762 if (ifa->flags & IFA_F_PERMANENT) {
763 onlink = 1;
764 if (deleted)
765 break;
766 } else {
767 unsigned long lifetime;
768
769 if (!onlink)
770 onlink = -1;
771
772 spin_lock(&ifa->lock);
4bed72e4
YH		 773
774 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
775 /*
776 * Note: Because this address is
777 * not permanent, lifetime <
778 * LONG_MAX / HZ here.
779 */
1da177e4
LT		 780 if (time_before(expires,
781 ifa->tstamp + lifetime * HZ))
782 expires = ifa->tstamp + lifetime * HZ;
783 spin_unlock(&ifa->lock);
784 }
785 }
786 }
787 }
788 write_unlock_bh(&idev->lock);
789
b2238566
AV		 790 addrconf_del_timer(ifp);
791
1da177e4
LT		 792 ipv6_ifa_notify(RTM_DELADDR, ifp);
793
e041c683 794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 795
1da177e4
LT		 796 /*
797 * Purge or update corresponding prefix
798 *
799 * 1) we don't purge prefix here if address was not permanent.
800 * prefix is managed by its own lifetime.
801 * 2) if there're no addresses, delete prefix.
802 * 3) if there're still other permanent address(es),
803 * corresponding prefix is still permanent.
804 * 4) otherwise, update prefix lifetime to the
805 * longest valid lifetime among the corresponding
806 * addresses on the device.
807 * Note: subsequent RA will update lifetime.
808 *
809 * --yoshfuji
810 */
811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
812 struct in6_addr prefix;
813 struct rt6_info *rt;
c346dca1 814 struct net *net = dev_net(ifp->idev->dev);
1da177e4 815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 817
2b5ead46 818 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 819 if (onlink == 0) {
e0a1ad73 820 ip6_del_rt(rt);
1da177e4
LT		 821 rt = NULL;
822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
823 rt->rt6i_expires = expires;
824 rt->rt6i_flags |= RTF_EXPIRES;
825 }
826 }
d8d1f30b 827 dst_release(&rt->dst);
1da177e4
LT		 828 }
829
4c5ff6a6 830out:
1da177e4
LT		 831 in6_ifa_put(ifp);
832}
833
834#ifdef CONFIG_IPV6_PRIVACY
835static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
836{
837 struct inet6_dev *idev = ifp->idev;
838 struct in6_addr addr, *tmpaddr;
839 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 840 unsigned long regen_advance;
1da177e4
LT		 841 int tmp_plen;
842 int ret = 0;
843 int max_addresses;
95c385b4 844 u32 addr_flags;
1da177e4
LT		 845
846 write_lock(&idev->lock);
847 if (ift) {
848 spin_lock_bh(&ift->lock);
849 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
850 spin_unlock_bh(&ift->lock);
851 tmpaddr = &addr;
852 } else {
853 tmpaddr = NULL;
854 }
855retry:
856 in6_dev_hold(idev);
857 if (idev->cnf.use_tempaddr <= 0) {
858 write_unlock(&idev->lock);
859 printk(KERN_INFO
860 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 spin_lock_bh(&ifp->lock);
866 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
867 idev->cnf.use_tempaddr = -1; /*XXX*/
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
872 in6_dev_put(idev);
873 ret = -1;
874 goto out;
875 }
876 in6_ifa_hold(ifp);
877 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
878 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
879 spin_unlock_bh(&ifp->lock);
880 write_unlock(&idev->lock);
881 printk(KERN_WARNING
882 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
883 in6_ifa_put(ifp);
884 in6_dev_put(idev);
885 ret = -1;
886 goto out;
887 }
888 memcpy(&addr.s6_addr[8], idev->rndid, 8);
889 tmp_valid_lft = min_t(__u32,
890 ifp->valid_lft,
891 idev->cnf.temp_valid_lft);
1ab1457c
YH		 892 tmp_prefered_lft = min_t(__u32,
893 ifp->prefered_lft,
784e2710
BH		 894 idev->cnf.temp_prefered_lft -
895 idev->cnf.max_desync_factor);
1da177e4
LT		 896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
901
eac55bf9
BB		 902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
1da177e4 905 write_unlock(&idev->lock);
95c385b4 906
eac55bf9
BB		 907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
911 */
912 if (tmp_prefered_lft <= regen_advance) {
913 in6_ifa_put(ifp);
914 in6_dev_put(idev);
915 ret = -1;
916 goto out;
917 }
918
95c385b4
NH		 919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
923
1da177e4 924 ift = !max_addresses ||
1ab1457c 925 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 926 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 addr_flags) : NULL;
1da177e4
LT		 929 if (!ift || IS_ERR(ift)) {
930 in6_ifa_put(ifp);
931 in6_dev_put(idev);
932 printk(KERN_INFO
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
934 tmpaddr = &addr;
935 write_lock(&idev->lock);
936 goto retry;
937 }
938
939 spin_lock_bh(&ift->lock);
940 ift->ifpub = ifp;
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
946
947 addrconf_dad_start(ift, 0);
948 in6_ifa_put(ift);
949 in6_dev_put(idev);
950out:
951 return ret;
952}
953#endif
954
955/*
072047e4 956 * Choose an appropriate source address (RFC3484)
1da177e4 957 */
a9b05723
YH		 958enum {
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963#ifdef CONFIG_IPV6_MIP6
964 IPV6_SADDR_RULE_HOA,
965#endif
966 IPV6_SADDR_RULE_OIF,
967 IPV6_SADDR_RULE_LABEL,
968#ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
970#endif
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
973 IPV6_SADDR_RULE_MAX
974};
975
072047e4 976struct ipv6_saddr_score {
a9b05723
YH		 977 int rule;
978 int addr_type;
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
981 int scopedist;
982 int matchlen;
072047e4
YH		 983};
984
a9b05723 985struct ipv6_saddr_dst {
9acd9f3a 986 const struct in6_addr *addr;
a9b05723
YH		 987 int ifindex;
988 int scope;
989 int label;
7cbca67c 990 unsigned int prefs;
a9b05723 991};
072047e4 992
b6f99a21 993static inline int ipv6_saddr_preferred(int type)
1da177e4 994{
45bb0060 995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 996 return 1;
997 return 0;
1da177e4
LT		 998}
999
3de23255
BT		 1000static int ipv6_get_saddr_eval(struct net *net,
1001 struct ipv6_saddr_score *score,
a9b05723
YH		 1002 struct ipv6_saddr_dst *dst,
1003 int i)
1004{
1005 int ret;
1006
1007 if (i <= score->rule) {
1008 switch (i) {
1009 case IPV6_SADDR_RULE_SCOPE:
1010 ret = score->scopedist;
1011 break;
1012 case IPV6_SADDR_RULE_PREFIX:
1013 ret = score->matchlen;
1014 break;
1015 default:
1016 ret = !!test_bit(i, score->scorebits);
1017 }
1018 goto out;
1019 }
1020
1021 switch (i) {
1022 case IPV6_SADDR_RULE_INIT:
1023 /* Rule 0: remember if hiscore is not ready yet */
1024 ret = !!score->ifa;
1025 break;
1026 case IPV6_SADDR_RULE_LOCAL:
1027 /* Rule 1: Prefer same address */
1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1029 break;
1030 case IPV6_SADDR_RULE_SCOPE:
1031 /* Rule 2: Prefer appropriate scope
1032 *
1033 * ret
1034 * ^
1035 * -1 | d 15
1036 * ---+--+-+---> scope
1037 * |
1038 * | d is scope of the destination.
1039 * B-d | \
1040 * | \ <- smaller scope is better if
1041 * B-15 | \ if scope is enough for destinaion.
1042 * | ret = B - scope (-1 <= scope >= d <= 15).
1043 * d-C-1 | /
1044 * |/ <- greater is better
1045 * -C / if scope is not enough for destination.
1046 * /| ret = scope - C (-1 <= d < scope <= 15).
1047 *
1048 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050 * Assume B = 0 and we get C > 29.
1051 */
1052 ret = __ipv6_addr_src_scope(score->addr_type);
1053 if (ret >= dst->scope)
1054 ret = -ret;
1055 else
1056 ret -= 128; /* 30 is enough */
1057 score->scopedist = ret;
1058 break;
1059 case IPV6_SADDR_RULE_PREFERRED:
1060 /* Rule 3: Avoid deprecated and optimistic addresses */
1061 ret = ipv6_saddr_preferred(score->addr_type) ||
1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1063 break;
1064#ifdef CONFIG_IPV6_MIP6
1065 case IPV6_SADDR_RULE_HOA:
7cbca67c 1066 {
a9b05723 1067 /* Rule 4: Prefer home address */
7cbca67c
YH		 1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1070 break;
7cbca67c 1071 }
a9b05723
YH		 1072#endif
1073 case IPV6_SADDR_RULE_OIF:
1074 /* Rule 5: Prefer outgoing interface */
1075 ret = (!dst->ifindex ||
1076 dst->ifindex == score->ifa->idev->dev->ifindex);
1077 break;
1078 case IPV6_SADDR_RULE_LABEL:
1079 /* Rule 6: Prefer matching label */
3de23255
BT		 1080 ret = ipv6_addr_label(net,
1081 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1082 score->ifa->idev->dev->ifindex) == dst->label;
1083 break;
1084#ifdef CONFIG_IPV6_PRIVACY
1085 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1086 {
a9b05723
YH		 1087 /* Rule 7: Prefer public address
1088 * Note: prefer temprary address if use_tempaddr >= 2
1089 */
7cbca67c
YH		 1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092 score->ifa->idev->cnf.use_tempaddr >= 2;
1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1094 break;
7cbca67c 1095 }
a9b05723
YH		 1096#endif
1097 case IPV6_SADDR_RULE_ORCHID:
1098 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099 * non-ORCHID vs non-ORCHID
1100 */
1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102 ipv6_addr_orchid(dst->addr));
1103 break;
1104 case IPV6_SADDR_RULE_PREFIX:
1105 /* Rule 8: Use longest matching prefix */
1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107 dst->addr);
1108 break;
1109 default:
1110 ret = 0;
1111 }
1112
1113 if (ret)
1114 __set_bit(i, score->scorebits);
1115 score->rule = i;
1116out:
1117 return ret;
1118}
1119
191cd582 1120int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1121 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1122 struct in6_addr *saddr)
1da177e4 1123{
a9b05723
YH		 1124 struct ipv6_saddr_score scores[2],
1125 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1126 struct ipv6_saddr_dst dst;
072047e4 1127 struct net_device *dev;
a9b05723 1128 int dst_type;
1da177e4 1129
a9b05723
YH		 1130 dst_type = __ipv6_addr_type(daddr);
1131 dst.addr = daddr;
1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1135 dst.prefs = prefs;
a9b05723
YH		 1136
1137 hiscore->rule = -1;
1138 hiscore->ifa = NULL;
1da177e4 1139
8814c4b5 1140 rcu_read_lock();
1da177e4 1141
c6d14c84 1142 for_each_netdev_rcu(net, dev) {
072047e4 1143 struct inet6_dev *idev;
072047e4 1144
a9b05723 1145 /* Candidate Source Address (section 4)
072047e4
YH		 1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1150 * interface.
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1155 * interface.)
1156 */
a9b05723
YH		 1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1160 continue;
1da177e4 1161
1da177e4 1162 idev = __in6_dev_get(dev);
072047e4
YH		 1163 if (!idev)
1164 continue;
1165
1166 read_lock_bh(&idev->lock);
502a2ffd 1167 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1168 int i;
072047e4 1169
a9b05723 1170 /*
6b3ae80a
YH		 1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
95c385b4 1174 * sense, unless it is also flagged as optimistic.
6b3ae80a 1175 * - Candidate Source Address (section 4)
072047e4
YH		 1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1179 */
a9b05723
YH		 1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1182 continue;
a9b05723
YH		 1183
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1185
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1188 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1189 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1190 "assigned as unicast address on %s",
1191 dev->name);
1192 continue;
1193 }
1194
a9b05723
YH		 1195 score->rule = -1;
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1197
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1200
3de23255
BT		 1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1203
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1207 /*
1208 * special case:
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1213 * values.
1214 */
1215 goto try_nextdev;
1216 }
1217 break;
1218 } else if (minihiscore < miniscore) {
a9b05723
YH		 1219 if (hiscore->ifa)
1220 in6_ifa_put(hiscore->ifa);
1221
1222 in6_ifa_hold(score->ifa);
1223
a0bffffc 1224 swap(hiscore, score);
a9b05723
YH		 1225
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1228
1229 break;
1da177e4 1230 }
072047e4 1231 }
1da177e4 1232 }
a9b05723 1233try_nextdev:
072047e4 1234 read_unlock_bh(&idev->lock);
1da177e4 1235 }
8814c4b5 1236 rcu_read_unlock();
1da177e4 1237
a9b05723 1238 if (!hiscore->ifa)
072047e4 1239 return -EADDRNOTAVAIL;
1ab1457c 1240
a9b05723
YH		 1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
072047e4 1243 return 0;
1da177e4 1244}
5e5f3f0f 1245EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1246
95c385b4
NH		 1247int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1248 unsigned char banned_flags)
1da177e4
LT		 1249{
1250 struct inet6_dev *idev;
1251 int err = -EADDRNOTAVAIL;
1252
8814c4b5 1253 rcu_read_lock();
e21e8467
SH		 1254 idev = __in6_dev_get(dev);
1255 if (idev) {
1da177e4
LT		 1256 struct inet6_ifaddr *ifp;
1257
1258 read_lock_bh(&idev->lock);
502a2ffd 1259 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1260 if (ifp->scope == IFA_LINK &&
1261 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1262 ipv6_addr_copy(addr, &ifp->addr);
1263 err = 0;
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&idev->lock);
1268 }
8814c4b5 1269 rcu_read_unlock();
1da177e4
LT		 1270 return err;
1271}
1272
1273static int ipv6_count_addresses(struct inet6_dev *idev)
1274{
1275 int cnt = 0;
1276 struct inet6_ifaddr *ifp;
1277
1278 read_lock_bh(&idev->lock);
502a2ffd 1279 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1280 cnt++;
1281 read_unlock_bh(&idev->lock);
1282 return cnt;
1283}
1284
bfeade08
DL		 1285int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 struct net_device *dev, int strict)
1da177e4 1287{
eedf042a 1288 struct inet6_ifaddr *ifp;
c2e21293 1289 struct hlist_node *node;
3a88a81d 1290 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1291
5c578aed 1292 rcu_read_lock_bh();
1293 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1294 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1295 continue;
1da177e4 1296 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1297 !(ifp->flags&IFA_F_TENTATIVE) &&
1298 (dev == NULL || ifp->idev->dev == dev ||
1299 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1300 rcu_read_unlock_bh();
1301 return 1;
1da177e4
LT		 1302 }
1303 }
5c578aed 1304
eedf042a
SH		 1305 rcu_read_unlock_bh();
1306 return 0;
1da177e4 1307}
7159039a
YH		 1308EXPORT_SYMBOL(ipv6_chk_addr);
1309
3e81c6da
DM		 1310static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1311 struct net_device *dev)
1da177e4 1312{
3e81c6da 1313 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1314 struct inet6_ifaddr *ifp;
1315 struct hlist_node *node;
1da177e4 1316
c2e21293 1317 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1318 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1319 continue;
1da177e4
LT		 1320 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1322 return true;
1da177e4
LT		 1323 }
1324 }
3e81c6da 1325 return false;
1da177e4
LT		 1326}
1327
52eeeb84
YH		 1328int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1329{
1330 struct inet6_dev *idev;
1331 struct inet6_ifaddr *ifa;
1332 int onlink;
1333
1334 onlink = 0;
1335 rcu_read_lock();
1336 idev = __in6_dev_get(dev);
1337 if (idev) {
1338 read_lock_bh(&idev->lock);
502a2ffd 1339 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1340 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1341 ifa->prefix_len);
1342 if (onlink)
1343 break;
1344 }
1345 read_unlock_bh(&idev->lock);
1346 }
1347 rcu_read_unlock();
1348 return onlink;
1349}
1350
1351EXPORT_SYMBOL(ipv6_chk_prefix);
1352
9acd9f3a 1353struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1354 struct net_device *dev, int strict)
1da177e4 1355{
b79d1d54 1356 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1357 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1358 struct hlist_node *node;
1da177e4 1359
5c578aed 1360 rcu_read_lock_bh();
4f70ecca 1361 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1362 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1363 continue;
1da177e4
LT		 1364 if (ipv6_addr_equal(&ifp->addr, addr)) {
1365 if (dev == NULL || ifp->idev->dev == dev ||
1366 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1367 result = ifp;
1da177e4
LT		 1368 in6_ifa_hold(ifp);
1369 break;
1370 }
1371 }
1372 }
5c578aed 1373 rcu_read_unlock_bh();
1da177e4 1374
b79d1d54 1375 return result;
1da177e4
LT		 1376}
1377
1da177e4
LT		 1378/* Gets referenced address, destroys ifaddr */
1379
cc411d0b 1380static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1381{
1da177e4
LT		 1382 if (ifp->flags&IFA_F_PERMANENT) {
1383 spin_lock_bh(&ifp->lock);
1384 addrconf_del_timer(ifp);
1385 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1386 if (dad_failed)
1387 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1388 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1389 if (dad_failed)
1390 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1391 in6_ifa_put(ifp);
1392#ifdef CONFIG_IPV6_PRIVACY
1393 } else if (ifp->flags&IFA_F_TEMPORARY) {
1394 struct inet6_ifaddr *ifpub;
1395 spin_lock_bh(&ifp->lock);
1396 ifpub = ifp->ifpub;
1397 if (ifpub) {
1398 in6_ifa_hold(ifpub);
1399 spin_unlock_bh(&ifp->lock);
1400 ipv6_create_tempaddr(ifpub, ifp);
1401 in6_ifa_put(ifpub);
1402 } else {
1403 spin_unlock_bh(&ifp->lock);
1404 }
1405 ipv6_del_addr(ifp);
1406#endif
1407 } else
1408 ipv6_del_addr(ifp);
1409}
1410
f2344a13
HX		 1411static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1412{
1413 int err = -ENOENT;
1414
1415 spin_lock(&ifp->state_lock);
1416 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1417 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1418 err = 0;
1419 }
1420 spin_unlock(&ifp->state_lock);
1421
1422 return err;
1423}
1424
3c21edbd
YH		 1425void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1426{
1b34be74 1427 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1428
f2344a13
HX		 1429 if (addrconf_dad_end(ifp))
1430 return;
1431
9bdd8d40 1432 if (net_ratelimit())
0522fea6
JR		 1433 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1434 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1435
1b34be74
YH		 1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437 struct in6_addr addr;
1438
1439 addr.s6_addr32[0] = htonl(0xfe800000);
1440 addr.s6_addr32[1] = 0;
1441
1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443 ipv6_addr_equal(&ifp->addr, &addr)) {
1444 /* DAD failed for link-local based on MAC address */
1445 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1446
1447 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1448 ifp->idev->dev->name);
1b34be74
YH		 1449 }
1450 }
1451
cc411d0b 1452 addrconf_dad_stop(ifp, 1);
3c21edbd 1453}
1da177e4
LT		 1454
1455/* Join to solicited addr multicast group. */
1456
1457void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1458{
1459 struct in6_addr maddr;
1460
1461 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1462 return;
1463
1464 addrconf_addr_solict_mult(addr, &maddr);
1465 ipv6_dev_mc_inc(dev, &maddr);
1466}
1467
1468void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1469{
1470 struct in6_addr maddr;
1471
1472 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1473 return;
1474
1475 addrconf_addr_solict_mult(addr, &maddr);
1476 __ipv6_dev_mc_dec(idev, &maddr);
1477}
1478
20380731 1479static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1480{
1481 struct in6_addr addr;
1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483 if (ipv6_addr_any(&addr))
1484 return;
1485 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1486}
1487
20380731 1488static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1489{
1490 struct in6_addr addr;
1491 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1492 if (ipv6_addr_any(&addr))
1493 return;
1494 __ipv6_dev_ac_dec(ifp->idev, &addr);
1495}
1496
073a8e0e
YH		 1497static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1498{
1499 if (dev->addr_len != ETH_ALEN)
1500 return -1;
1501 memcpy(eui, dev->dev_addr, 3);
1502 memcpy(eui + 5, dev->dev_addr + 3, 3);
1503
1504 /*
1505 * The zSeries OSA network cards can be shared among various
1506 * OS instances, but the OSA cards have only one MAC address.
1507 * This leads to duplicate address conflicts in conjunction
1508 * with IPv6 if more than one instance uses the same card.
1509 *
1510 * The driver for these cards can deliver a unique 16-bit
1511 * identifier for each instance sharing the same card. It is
1512 * placed instead of 0xFFFE in the interface identifier. The
1513 * "u" bit of the interface identifier is not inverted in this
1514 * case. Hence the resulting interface identifier has local
1515 * scope according to RFC2373.
1516 */
1517 if (dev->dev_id) {
1518 eui[3] = (dev->dev_id >> 8) & 0xFF;
1519 eui[4] = dev->dev_id & 0xFF;
1520 } else {
1521 eui[3] = 0xFF;
1522 eui[4] = 0xFE;
1523 eui[0] ^= 2;
1524 }
1525 return 0;
1526}
1527
1528static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1529{
1530 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1531 if (dev->addr_len != ARCNET_ALEN)
1532 return -1;
1533 memset(eui, 0, 7);
1534 eui[7] = *(u8*)dev->dev_addr;
1535 return 0;
1536}
1537
1538static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1539{
1540 if (dev->addr_len != INFINIBAND_ALEN)
1541 return -1;
1542 memcpy(eui, dev->dev_addr + 12, 8);
1543 eui[0] |= 2;
1544 return 0;
1545}
1546
c61393ea 1547static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1548{
9af28511
SH		 1549 if (addr == 0)
1550 return -1;
dfd982ba
YH		 1551 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1552 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1553 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1554 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1555 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1556 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1557 eui[1] = 0;
1558 eui[2] = 0x5E;
1559 eui[3] = 0xFE;
1560 memcpy(eui + 4, &addr, 4);
1561 return 0;
1562}
dfd982ba
YH		 1563
1564static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1565{
1566 if (dev->priv_flags & IFF_ISATAP)
1567 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1568 return -1;
1569}
1570
1da177e4
LT		 1571static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572{
1573 switch (dev->type) {
1574 case ARPHRD_ETHER:
1575 case ARPHRD_FDDI:
1576 case ARPHRD_IEEE802_TR:
073a8e0e 1577 return addrconf_ifid_eui48(eui, dev);
1da177e4 1578 case ARPHRD_ARCNET:
073a8e0e 1579 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1580 case ARPHRD_INFINIBAND:
073a8e0e 1581 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1582 case ARPHRD_SIT:
dfd982ba 1583 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1584 }
1585 return -1;
1586}
1587
1588static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1589{
1590 int err = -1;
1591 struct inet6_ifaddr *ifp;
1592
1593 read_lock_bh(&idev->lock);
502a2ffd 1594 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1595 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1596 memcpy(eui, ifp->addr.s6_addr+8, 8);
1597 err = 0;
1598 break;
1599 }
1600 }
1601 read_unlock_bh(&idev->lock);
1602 return err;
1603}
1604
1605#ifdef CONFIG_IPV6_PRIVACY
1606/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1607static int __ipv6_regen_rndid(struct inet6_dev *idev)
1608{
1da177e4 1609regen:
955189ef 1610 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1611 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1612
1613 /*
1614 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1615 * check if generated address is not inappropriate
1616 *
1617 * - Reserved subnet anycast (RFC 2526)
1618 * 11111101 11....11 1xxxxxxx
c7dc89c0 1619 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1620 * 00-00-5E-FE-xx-xx-xx-xx
1621 * - value 0
1622 * - XXX: already assigned to an address on the device
1623 */
1ab1457c 1624 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1625 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1626 (idev->rndid[7]&0x80))
1627 goto regen;
1628 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1629 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1630 goto regen;
1631 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1632 goto regen;
1633 }
1634
1635 return 0;
1636}
1637
1638static void ipv6_regen_rndid(unsigned long data)
1639{
1640 struct inet6_dev *idev = (struct inet6_dev *) data;
1641 unsigned long expires;
1642
8814c4b5 1643 rcu_read_lock_bh();
1da177e4
LT		 1644 write_lock_bh(&idev->lock);
1645
1646 if (idev->dead)
1647 goto out;
1648
1649 if (__ipv6_regen_rndid(idev) < 0)
1650 goto out;
1ab1457c 1651
1da177e4 1652 expires = jiffies +
1ab1457c 1653 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1654 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1655 idev->cnf.max_desync_factor * HZ;
1da177e4
LT		 1656 if (time_before(expires, jiffies)) {
1657 printk(KERN_WARNING
1658 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1659 idev->dev->name);
1660 goto out;
1661 }
1662
1663 if (!mod_timer(&idev->regen_timer, expires))
1664 in6_dev_hold(idev);
1665
1666out:
1667 write_unlock_bh(&idev->lock);
8814c4b5 1668 rcu_read_unlock_bh();
1da177e4
LT		 1669 in6_dev_put(idev);
1670}
1671
1672static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1673 int ret = 0;
1674
1675 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1676 ret = __ipv6_regen_rndid(idev);
1677 return ret;
1678}
1679#endif
1680
1681/*
1682 * Add prefix route.
1683 */
1684
1685static void
1686addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1687 unsigned long expires, u32 flags)
1da177e4 1688{
86872cb5
TG		 1689 struct fib6_config cfg = {
1690 .fc_table = RT6_TABLE_PREFIX,
1691 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692 .fc_ifindex = dev->ifindex,
1693 .fc_expires = expires,
1694 .fc_dst_len = plen,
1695 .fc_flags = RTF_UP | flags,
c346dca1 1696 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1697 .fc_protocol = RTPROT_KERNEL,
86872cb5 1698 };
1da177e4 1699
86872cb5 1700 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1701
1702 /* Prevent useless cloning on PtP SIT.
1703 This thing is done here expecting that the whole
1704 class of non-broadcast devices need not cloning.
1705 */
0be669bb 1706#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1707 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1708 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1709#endif
1da177e4 1710
86872cb5 1711 ip6_route_add(&cfg);
1da177e4
LT		 1712}
1713
1714/* Create "default" multicast route to the interface */
1715
1716static void addrconf_add_mroute(struct net_device *dev)
1717{
86872cb5
TG		 1718 struct fib6_config cfg = {
1719 .fc_table = RT6_TABLE_LOCAL,
1720 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1721 .fc_ifindex = dev->ifindex,
1722 .fc_dst_len = 8,
1723 .fc_flags = RTF_UP,
c346dca1 1724 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1725 };
1726
1727 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1728
1729 ip6_route_add(&cfg);
1da177e4
LT		 1730}
1731
0be669bb 1732#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1733static void sit_route_add(struct net_device *dev)
1734{
86872cb5
TG		 1735 struct fib6_config cfg = {
1736 .fc_table = RT6_TABLE_MAIN,
1737 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1738 .fc_ifindex = dev->ifindex,
1739 .fc_dst_len = 96,
1740 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1741 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1742 };
1da177e4
LT		 1743
1744 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1745 ip6_route_add(&cfg);
1da177e4 1746}
0be669bb 1747#endif
1da177e4
LT		 1748
1749static void addrconf_add_lroute(struct net_device *dev)
1750{
1751 struct in6_addr addr;
1752
1753 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1754 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1755}
1756
1757static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1758{
1759 struct inet6_dev *idev;
1760
1761 ASSERT_RTNL();
1762
e21e8467
SH		 1763 idev = ipv6_find_idev(dev);
1764 if (!idev)
64e724f6
BH		 1765 return ERR_PTR(-ENOBUFS);
1766
1767 if (idev->cnf.disable_ipv6)
1768 return ERR_PTR(-EACCES);
1da177e4
LT		 1769
1770 /* Add default multicast route */
1771 addrconf_add_mroute(dev);
1772
1773 /* Add link local route */
1774 addrconf_add_lroute(dev);
1775 return idev;
1776}
1777
1778void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1779{
1780 struct prefix_info *pinfo;
1781 __u32 valid_lft;
1782 __u32 prefered_lft;
1783 int addr_type;
1da177e4 1784 struct inet6_dev *in6_dev;
56d417b1 1785 struct net *net = dev_net(dev);
1da177e4
LT		 1786
1787 pinfo = (struct prefix_info *) opt;
1ab1457c 1788
1da177e4
LT		 1789 if (len < sizeof(struct prefix_info)) {
1790 ADBG(("addrconf: prefix option too short\n"));
1791 return;
1792 }
1ab1457c 1793
1da177e4
LT		 1794 /*
1795 * Validation checks ([ADDRCONF], page 19)
1796 */
1797
1798 addr_type = ipv6_addr_type(&pinfo->prefix);
1799
1800 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1801 return;
1802
1803 valid_lft = ntohl(pinfo->valid);
1804 prefered_lft = ntohl(pinfo->prefered);
1805
1806 if (prefered_lft > valid_lft) {
1807 if (net_ratelimit())
1808 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1809 return;
1810 }
1811
1812 in6_dev = in6_dev_get(dev);
1813
1814 if (in6_dev == NULL) {
1815 if (net_ratelimit())
1816 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1817 return;
1818 }
1819
1820 /*
1821 * Two things going on here:
1822 * 1) Add routes for on-link prefixes
1823 * 2) Configure prefixes with the auto flag set
1824 */
1825
4bed72e4
YH		 1826 if (pinfo->onlink) {
1827 struct rt6_info *rt;
1828 unsigned long rt_expires;
1829
6f704992
YH		 1830 /* Avoid arithmetic overflow. Really, we could
1831 * save rt_expires in seconds, likely valid_lft,
1832 * but it would require division in fib gc, that it
1833 * not good.
1834 */
4bed72e4
YH		 1835 if (HZ > USER_HZ)
1836 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1837 else
1838 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1839
4bed72e4
YH		 1840 if (addrconf_finite_timeout(rt_expires))
1841 rt_expires *= HZ;
1da177e4 1842
56d417b1 1843 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1844 dev->ifindex, 1);
1da177e4 1845
2b5ead46 1846 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1847 /* Autoconf prefix route */
1848 if (valid_lft == 0) {
1849 ip6_del_rt(rt);
1850 rt = NULL;
4bed72e4 1851 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1852 /* not infinity */
1853 rt->rt6i_expires = jiffies + rt_expires;
1854 rt->rt6i_flags |= RTF_EXPIRES;
1855 } else {
1856 rt->rt6i_flags &= ~RTF_EXPIRES;
1857 rt->rt6i_expires = 0;
1da177e4
LT		 1858 }
1859 } else if (valid_lft) {
6f704992 1860 clock_t expires = 0;
4bed72e4
YH		 1861 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1862 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1863 /* not infinity */
1864 flags |= RTF_EXPIRES;
1865 expires = jiffies_to_clock_t(rt_expires);
1866 }
1da177e4 1867 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1868 dev, expires, flags);
1da177e4
LT		 1869 }
1870 if (rt)
d8d1f30b 1871 dst_release(&rt->dst);
1da177e4
LT		 1872 }
1873
1874 /* Try to figure out our local address for this prefix */
1875
1876 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1877 struct inet6_ifaddr * ifp;
1878 struct in6_addr addr;
1879 int create = 0, update_lft = 0;
1880
1881 if (pinfo->prefix_len == 64) {
1882 memcpy(&addr, &pinfo->prefix, 8);
1883 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1884 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1885 in6_dev_put(in6_dev);
1886 return;
1887 }
1888 goto ok;
1889 }
1890 if (net_ratelimit())
1891 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1892 pinfo->prefix_len);
1893 in6_dev_put(in6_dev);
1894 return;
1895
1896ok:
1897
53b7997f 1898 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1899
1900 if (ifp == NULL && valid_lft) {
1901 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1902 u32 addr_flags = 0;
1903
1904#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1905 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1906 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1907 addr_flags = IFA_F_OPTIMISTIC;
1908#endif
1da177e4
LT		 1909
1910 /* Do not allow to create too much of autoconfigured
1911 * addresses; this would be too easy way to crash kernel.
1912 */
1913 if (!max_addresses ||
1914 ipv6_count_addresses(in6_dev) < max_addresses)
1915 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1916 addr_type&IPV6_ADDR_SCOPE_MASK,
1917 addr_flags);
1da177e4
LT		 1918
1919 if (!ifp || IS_ERR(ifp)) {
1920 in6_dev_put(in6_dev);
1921 return;
1922 }
1923
1924 update_lft = create = 1;
1925 ifp->cstamp = jiffies;
1926 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1927 }
1928
1929 if (ifp) {
1930 int flags;
1931 unsigned long now;
1932#ifdef CONFIG_IPV6_PRIVACY
1933 struct inet6_ifaddr *ift;
1934#endif
1935 u32 stored_lft;
1936
1937 /* update lifetime (RFC2462 5.5.3 e) */
1938 spin_lock(&ifp->lock);
1939 now = jiffies;
1940 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1941 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1942 else
1943 stored_lft = 0;
1944 if (!update_lft && stored_lft) {
1945 if (valid_lft > MIN_VALID_LIFETIME ||
1946 valid_lft > stored_lft)
1947 update_lft = 1;
1948 else if (stored_lft <= MIN_VALID_LIFETIME) {
1949 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1950 /*
1951 * RFC 4862 Section 5.5.3e:
1952 * "Note that the preferred lifetime of
1953 * the corresponding address is always
1954 * reset to the Preferred Lifetime in
1955 * the received Prefix Information
1956 * option, regardless of whether the
1957 * valid lifetime is also reset or
1958 * ignored."
1959 *
1960 * So if the preferred lifetime in
1961 * this advertisement is different
1962 * than what we have stored, but the
1963 * valid lifetime is invalid, just
1964 * reset prefered_lft.
1965 *
1966 * We must set the valid lifetime
1967 * to the stored lifetime since we'll
1968 * be updating the timestamp below,
1969 * else we'll set it back to the
1970 * minumum.
1971 */
1972 if (prefered_lft != ifp->prefered_lft) {
1973 valid_lft = stored_lft;
1974 update_lft = 1;
1975 }
1da177e4
LT		 1976 } else {
1977 valid_lft = MIN_VALID_LIFETIME;
1978 if (valid_lft < prefered_lft)
1979 prefered_lft = valid_lft;
1980 update_lft = 1;
1981 }
1982 }
1983
1984 if (update_lft) {
1985 ifp->valid_lft = valid_lft;
1986 ifp->prefered_lft = prefered_lft;
1987 ifp->tstamp = now;
1988 flags = ifp->flags;
1989 ifp->flags &= ~IFA_F_DEPRECATED;
1990 spin_unlock(&ifp->lock);
1991
1992 if (!(flags&IFA_F_TENTATIVE))
1993 ipv6_ifa_notify(0, ifp);
1994 } else
1995 spin_unlock(&ifp->lock);
1996
1997#ifdef CONFIG_IPV6_PRIVACY
1998 read_lock_bh(&in6_dev->lock);
1999 /* update all temporary addresses in the list */
372e6c8f 2000 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 2001 /*
2002 * When adjusting the lifetimes of an existing
2003 * temporary address, only lower the lifetimes.
2004 * Implementations must not increase the
2005 * lifetimes of an existing temporary address
2006 * when processing a Prefix Information Option.
2007 */
c6fbfac2
BB		 2008 if (ifp != ift->ifpub)
2009 continue;
2010
1da177e4
LT		 2011 spin_lock(&ift->lock);
2012 flags = ift->flags;
2013 if (ift->valid_lft > valid_lft &&
2014 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2015 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2016 if (ift->prefered_lft > prefered_lft &&
2017 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2018 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2019 spin_unlock(&ift->lock);
2020 if (!(flags&IFA_F_TENTATIVE))
2021 ipv6_ifa_notify(0, ift);
2022 }
2023
2024 if (create && in6_dev->cnf.use_tempaddr > 0) {
2025 /*
2026 * When a new public address is created as described in [ADDRCONF],
2027 * also create a new temporary address.
2028 */
1ab1457c 2029 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2030 ipv6_create_tempaddr(ifp, NULL);
2031 } else {
2032 read_unlock_bh(&in6_dev->lock);
2033 }
2034#endif
2035 in6_ifa_put(ifp);
2036 addrconf_verify(0);
2037 }
2038 }
2039 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2040 in6_dev_put(in6_dev);
2041}
2042
2043/*
2044 * Set destination address.
2045 * Special case for SIT interfaces where we create a new "virtual"
2046 * device.
2047 */
af284937 2048int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2049{
2050 struct in6_ifreq ireq;
2051 struct net_device *dev;
2052 int err = -EINVAL;
2053
2054 rtnl_lock();
2055
2056 err = -EFAULT;
2057 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2058 goto err_exit;
2059
af284937 2060 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2061
2062 err = -ENODEV;
2063 if (dev == NULL)
2064 goto err_exit;
2065
0be669bb 2066#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2067 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2068 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2069 struct ifreq ifr;
1da177e4
LT		 2070 struct ip_tunnel_parm p;
2071
2072 err = -EADDRNOTAVAIL;
2073 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2074 goto err_exit;
2075
2076 memset(&p, 0, sizeof(p));
2077 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2078 p.iph.saddr = 0;
2079 p.iph.version = 4;
2080 p.iph.ihl = 5;
2081 p.iph.protocol = IPPROTO_IPV6;
2082 p.iph.ttl = 64;
d20b3109 2083 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2084
5bc3eb7e
SH		 2085 if (ops->ndo_do_ioctl) {
2086 mm_segment_t oldfs = get_fs();
2087
2088 set_fs(KERNEL_DS);
2089 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2090 set_fs(oldfs);
2091 } else
2092 err = -EOPNOTSUPP;
1da177e4
LT		 2093
2094 if (err == 0) {
2095 err = -ENOBUFS;
af284937
DL		 2096 dev = __dev_get_by_name(net, p.name);
2097 if (!dev)
1da177e4
LT		 2098 goto err_exit;
2099 err = dev_open(dev);
2100 }
2101 }
0be669bb 2102#endif
1da177e4
LT		 2103
2104err_exit:
2105 rtnl_unlock();
2106 return err;
2107}
2108
2109/*
2110 * Manual configuration of address on an interface
2111 */
af284937 2112static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2113 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2114 __u32 valid_lft)
1da177e4
LT		 2115{
2116 struct inet6_ifaddr *ifp;
2117 struct inet6_dev *idev;
2118 struct net_device *dev;
2119 int scope;
6f704992
YH		 2120 u32 flags;
2121 clock_t expires;
4bed72e4 2122 unsigned long timeout;
1da177e4
LT		 2123
2124 ASSERT_RTNL();
1ab1457c 2125
24ef0da7
TG		 2126 if (plen > 128)
2127 return -EINVAL;
2128
0778769d
NT		 2129 /* check the lifetime */
2130 if (!valid_lft || prefered_lft > valid_lft)
2131 return -EINVAL;
2132
af284937
DL		 2133 dev = __dev_get_by_index(net, ifindex);
2134 if (!dev)
1da177e4 2135 return -ENODEV;
1ab1457c 2136
64e724f6
BH		 2137 idev = addrconf_add_dev(dev);
2138 if (IS_ERR(idev))
2139 return PTR_ERR(idev);
1da177e4
LT		 2140
2141 scope = ipv6_addr_scope(pfx);
2142
4bed72e4
YH		 2143 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2144 if (addrconf_finite_timeout(timeout)) {
2145 expires = jiffies_to_clock_t(timeout * HZ);
2146 valid_lft = timeout;
6f704992 2147 flags = RTF_EXPIRES;
4bed72e4
YH		 2148 } else {
2149 expires = 0;
2150 flags = 0;
2151 ifa_flags |= IFA_F_PERMANENT;
6f704992 2152 }
0778769d 2153
4bed72e4
YH		 2154 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2155 if (addrconf_finite_timeout(timeout)) {
2156 if (timeout == 0)
2157 ifa_flags |= IFA_F_DEPRECATED;
2158 prefered_lft = timeout;
2159 }
0778769d
NT		 2160
2161 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2162
1da177e4 2163 if (!IS_ERR(ifp)) {
06aebfb7 2164 spin_lock_bh(&ifp->lock);
0778769d
NT		 2165 ifp->valid_lft = valid_lft;
2166 ifp->prefered_lft = prefered_lft;
2167 ifp->tstamp = jiffies;
06aebfb7 2168 spin_unlock_bh(&ifp->lock);
0778769d 2169
46d48046 2170 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2171 expires, flags);
95c385b4
NH		 2172 /*
2173 * Note that section 3.1 of RFC 4429 indicates
2174 * that the Optimistic flag should not be set for
2175 * manually configured addresses
2176 */
1da177e4
LT		 2177 addrconf_dad_start(ifp, 0);
2178 in6_ifa_put(ifp);
0778769d 2179 addrconf_verify(0);
1da177e4
LT		 2180 return 0;
2181 }
2182
2183 return PTR_ERR(ifp);
2184}
2185
af284937 2186static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2187 unsigned int plen)
1da177e4
LT		 2188{
2189 struct inet6_ifaddr *ifp;
2190 struct inet6_dev *idev;
2191 struct net_device *dev;
1ab1457c 2192
24ef0da7
TG		 2193 if (plen > 128)
2194 return -EINVAL;
2195
af284937
DL		 2196 dev = __dev_get_by_index(net, ifindex);
2197 if (!dev)
1da177e4
LT		 2198 return -ENODEV;
2199
2200 if ((idev = __in6_dev_get(dev)) == NULL)
2201 return -ENXIO;
2202
2203 read_lock_bh(&idev->lock);
502a2ffd 2204 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2205 if (ifp->prefix_len == plen &&
2206 ipv6_addr_equal(pfx, &ifp->addr)) {
2207 in6_ifa_hold(ifp);
2208 read_unlock_bh(&idev->lock);
1ab1457c 2209
1da177e4
LT		 2210 ipv6_del_addr(ifp);
2211
2212 /* If the last address is deleted administratively,
2213 disable IPv6 on this interface.
2214 */
502a2ffd 2215 if (list_empty(&idev->addr_list))
1da177e4
LT		 2216 addrconf_ifdown(idev->dev, 1);
2217 return 0;
2218 }
2219 }
2220 read_unlock_bh(&idev->lock);
2221 return -EADDRNOTAVAIL;
2222}
2223
2224
af284937 2225int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2226{
2227 struct in6_ifreq ireq;
2228 int err;
1ab1457c 2229
1da177e4
LT		 2230 if (!capable(CAP_NET_ADMIN))
2231 return -EPERM;
1ab1457c 2232
1da177e4
LT		 2233 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2234 return -EFAULT;
2235
2236 rtnl_lock();
af284937
DL		 2237 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2238 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2239 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2240 rtnl_unlock();
2241 return err;
2242}
2243
af284937 2244int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2245{
2246 struct in6_ifreq ireq;
2247 int err;
1ab1457c 2248
1da177e4
LT		 2249 if (!capable(CAP_NET_ADMIN))
2250 return -EPERM;
2251
2252 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2253 return -EFAULT;
2254
2255 rtnl_lock();
af284937
DL		 2256 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2257 ireq.ifr6_prefixlen);
1da177e4
LT		 2258 rtnl_unlock();
2259 return err;
2260}
2261
b5f348e5
IJ		 2262static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2263 int plen, int scope)
2264{
2265 struct inet6_ifaddr *ifp;
2266
2267 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2268 if (!IS_ERR(ifp)) {
2269 spin_lock_bh(&ifp->lock);
2270 ifp->flags &= ~IFA_F_TENTATIVE;
2271 spin_unlock_bh(&ifp->lock);
2272 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2273 in6_ifa_put(ifp);
2274 }
2275}
2276
0be669bb 2277#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2278static void sit_add_v4_addrs(struct inet6_dev *idev)
2279{
1da177e4
LT		 2280 struct in6_addr addr;
2281 struct net_device *dev;
c346dca1 2282 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2283 int scope;
2284
2285 ASSERT_RTNL();
2286
2287 memset(&addr, 0, sizeof(struct in6_addr));
2288 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2289
2290 if (idev->dev->flags&IFF_POINTOPOINT) {
2291 addr.s6_addr32[0] = htonl(0xfe800000);
2292 scope = IFA_LINK;
2293 } else {
2294 scope = IPV6_ADDR_COMPATv4;
2295 }
2296
2297 if (addr.s6_addr32[3]) {
b5f348e5 2298 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2299 return;
2300 }
2301
6fda7350 2302 for_each_netdev(net, dev) {
e5ed6399 2303 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2304 if (in_dev && (dev->flags & IFF_UP)) {
2305 struct in_ifaddr * ifa;
2306
2307 int flag = scope;
2308
2309 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2310 int plen;
2311
2312 addr.s6_addr32[3] = ifa->ifa_local;
2313
2314 if (ifa->ifa_scope == RT_SCOPE_LINK)
2315 continue;
2316 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2317 if (idev->dev->flags&IFF_POINTOPOINT)
2318 continue;
2319 flag |= IFA_HOST;
2320 }
2321 if (idev->dev->flags&IFF_POINTOPOINT)
2322 plen = 64;
2323 else
2324 plen = 96;
2325
b5f348e5 2326 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2327 }
2328 }
1ab1457c 2329 }
1da177e4 2330}
0be669bb 2331#endif
1da177e4
LT		 2332
2333static void init_loopback(struct net_device *dev)
2334{
2335 struct inet6_dev *idev;
1da177e4
LT		 2336
2337 /* ::1 */
2338
2339 ASSERT_RTNL();
2340
2341 if ((idev = ipv6_find_idev(dev)) == NULL) {
2342 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2343 return;
2344 }
2345
b5f348e5 2346 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2347}
2348
2349static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2350{
2351 struct inet6_ifaddr * ifp;
95c385b4
NH		 2352 u32 addr_flags = IFA_F_PERMANENT;
2353
2354#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2355 if (idev->cnf.optimistic_dad &&
702beb87 2356 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2357 addr_flags |= IFA_F_OPTIMISTIC;
2358#endif
1da177e4 2359
95c385b4
NH		 2360
2361 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2362 if (!IS_ERR(ifp)) {
46d48046 2363 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2364 addrconf_dad_start(ifp, 0);
2365 in6_ifa_put(ifp);
2366 }
2367}
2368
2369static void addrconf_dev_config(struct net_device *dev)
2370{
2371 struct in6_addr addr;
2372 struct inet6_dev * idev;
2373
2374 ASSERT_RTNL();
2375
74235a25
HX		 2376 if ((dev->type != ARPHRD_ETHER) &&
2377 (dev->type != ARPHRD_FDDI) &&
2378 (dev->type != ARPHRD_IEEE802_TR) &&
2379 (dev->type != ARPHRD_ARCNET) &&
2380 (dev->type != ARPHRD_INFINIBAND)) {
2381 /* Alas, we support only Ethernet autoconfiguration. */
2382 return;
2383 }
2384
1da177e4 2385 idev = addrconf_add_dev(dev);
64e724f6 2386 if (IS_ERR(idev))
1da177e4
LT		 2387 return;
2388
2389 memset(&addr, 0, sizeof(struct in6_addr));
2390 addr.s6_addr32[0] = htonl(0xFE800000);
2391
2392 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2393 addrconf_add_linklocal(idev, &addr);
2394}
2395
0be669bb 2396#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2397static void addrconf_sit_config(struct net_device *dev)
2398{
2399 struct inet6_dev *idev;
2400
2401 ASSERT_RTNL();
2402
1ab1457c
YH		 2403 /*
2404 * Configure the tunnel with one of our IPv4
2405 * addresses... we should configure all of
1da177e4
LT		 2406 * our v4 addrs in the tunnel
2407 */
2408
2409 if ((idev = ipv6_find_idev(dev)) == NULL) {
2410 printk(KERN_DEBUG "init sit: add_dev failed\n");
2411 return;
2412 }
2413
c7dc89c0
FT		 2414 if (dev->priv_flags & IFF_ISATAP) {
2415 struct in6_addr addr;
2416
2417 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2418 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2419 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2420 addrconf_add_linklocal(idev, &addr);
2421 return;
2422 }
2423
1da177e4
LT		 2424 sit_add_v4_addrs(idev);
2425
2426 if (dev->flags&IFF_POINTOPOINT) {
2427 addrconf_add_mroute(dev);
2428 addrconf_add_lroute(dev);
2429 } else
2430 sit_route_add(dev);
2431}
0be669bb 2432#endif
1da177e4
LT		 2433
2434static inline int
2435ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2436{
2437 struct in6_addr lladdr;
2438
95c385b4 2439 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2440 addrconf_add_linklocal(idev, &lladdr);
2441 return 0;
2442 }
2443 return -1;
2444}
2445
2446static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2447{
2448 struct net_device *link_dev;
c346dca1 2449 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2450
2451 /* first try to inherit the link-local address from the link device */
2452 if (idev->dev->iflink &&
6fda7350 2453 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2454 if (!ipv6_inherit_linklocal(idev, link_dev))
2455 return;
2456 }
2457 /* then try to inherit it from any device */
6fda7350 2458 for_each_netdev(net, link_dev) {
1da177e4
LT		 2459 if (!ipv6_inherit_linklocal(idev, link_dev))
2460 return;
2461 }
2462 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2463}
2464
2465/*
2466 * Autoconfigure tunnel with a link-local address so routing protocols,
2467 * DHCPv6, MLD etc. can be run over the virtual link
2468 */
2469
2470static void addrconf_ip6_tnl_config(struct net_device *dev)
2471{
2472 struct inet6_dev *idev;
2473
2474 ASSERT_RTNL();
2475
e21e8467 2476 idev = addrconf_add_dev(dev);
64e724f6 2477 if (IS_ERR(idev)) {
1da177e4
LT		 2478 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2479 return;
2480 }
2481 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2482}
2483
1ab1457c 2484static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2485 void * data)
2486{
2487 struct net_device *dev = (struct net_device *) data;
74235a25 2488 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2489 int run_pending = 0;
b217d616 2490 int err;
1da177e4 2491
e21e8467 2492 switch (event) {
45ba9dd2 2493 case NETDEV_REGISTER:
74235a25 2494 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2495 idev = ipv6_add_dev(dev);
2496 if (!idev)
b217d616 2497 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2498 }
2499 break;
bcdd553f 2500
1da177e4 2501 case NETDEV_UP:
3c21edbd 2502 case NETDEV_CHANGE:
c2edacf8
JV		 2503 if (dev->flags & IFF_SLAVE)
2504 break;
2505
3c21edbd 2506 if (event == NETDEV_UP) {
f24e3d65 2507 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2508 /* device is not ready yet. */
2509 printk(KERN_INFO
2510 "ADDRCONF(NETDEV_UP): %s: "
2511 "link is not ready\n",
2512 dev->name);
2513 break;
2514 }
99081049 2515
d31c7b8f
EP		 2516 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2517 idev = ipv6_add_dev(dev);
2518
e3ec6cfc 2519 if (idev) {
99081049 2520 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2521 run_pending = 1;
2522 }
3c21edbd 2523 } else {
f24e3d65 2524 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2525 /* device is still not ready. */
2526 break;
2527 }
2528
2529 if (idev) {
bcdd553f 2530 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2531 /* device is already configured. */
2532 break;
3c21edbd
YH		 2533 idev->if_flags |= IF_READY;
2534 }
2535
2536 printk(KERN_INFO
2537 "ADDRCONF(NETDEV_CHANGE): %s: "
2538 "link becomes ready\n",
2539 dev->name);
2540
c5e33bdd 2541 run_pending = 1;
3c21edbd
YH		 2542 }
2543
e21e8467 2544 switch (dev->type) {
0be669bb 2545#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2546 case ARPHRD_SIT:
2547 addrconf_sit_config(dev);
2548 break;
0be669bb 2549#endif
1da177e4
LT		 2550 case ARPHRD_TUNNEL6:
2551 addrconf_ip6_tnl_config(dev);
2552 break;
2553 case ARPHRD_LOOPBACK:
2554 init_loopback(dev);
2555 break;
2556
2557 default:
2558 addrconf_dev_config(dev);
2559 break;
3ff50b79 2560 }
bcdd553f 2561
1da177e4 2562 if (idev) {
c5e33bdd
YH		 2563 if (run_pending)
2564 addrconf_dad_run(idev);
2565
bcdd553f
SH		 2566 /*
2567 * If the MTU changed during the interface down,
2568 * when the interface up, the changed MTU must be
2569 * reflected in the idev as well as routers.
1da177e4 2570 */
bcdd553f
SH		 2571 if (idev->cnf.mtu6 != dev->mtu &&
2572 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2573 rt6_mtu_change(dev, dev->mtu);
2574 idev->cnf.mtu6 = dev->mtu;
2575 }
2576 idev->tstamp = jiffies;
2577 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2578
2579 /*
2580 * If the changed mtu during down is lower than
2581 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2582 */
2583 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2584 addrconf_ifdown(dev, 1);
1da177e4
LT		 2585 }
2586 break;
2587
2588 case NETDEV_CHANGEMTU:
d31c7b8f 2589 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2590 rt6_mtu_change(dev, dev->mtu);
2591 idev->cnf.mtu6 = dev->mtu;
2592 break;
2593 }
2594
d31c7b8f
EP		 2595 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2596 idev = ipv6_add_dev(dev);
2597 if (idev)
2598 break;
2599 }
2600
bcdd553f
SH		 2601 /*
2602 * MTU falled under IPV6_MIN_MTU.
2603 * Stop IPv6 on this interface.
2604 */
1da177e4
LT		 2605
2606 case NETDEV_DOWN:
2607 case NETDEV_UNREGISTER:
2608 /*
2609 * Remove all addresses from this interface.
2610 */
2611 addrconf_ifdown(dev, event != NETDEV_DOWN);
2612 break;
3c21edbd 2613
1da177e4 2614 case NETDEV_CHANGENAME:
1da177e4 2615 if (idev) {
5632c515 2616 snmp6_unregister_dev(idev);
408c4768 2617 addrconf_sysctl_unregister(idev);
f52295a9 2618 addrconf_sysctl_register(idev);
b217d616
HX		 2619 err = snmp6_register_dev(idev);
2620 if (err)
2621 return notifier_from_errno(err);
5632c515 2622 }
1da177e4 2623 break;
bcdd553f 2624
93d9b7d7
JP		 2625 case NETDEV_PRE_TYPE_CHANGE:
2626 case NETDEV_POST_TYPE_CHANGE:
2627 addrconf_type_change(dev, event);
75c78500 2628 break;
3ff50b79 2629 }
1da177e4
LT		 2630
2631 return NOTIFY_OK;
2632}
2633
2634/*
2635 * addrconf module should be notified of a device going up
2636 */
2637static struct notifier_block ipv6_dev_notf = {
2638 .notifier_call = addrconf_notify,
1da177e4
LT		 2639};
2640
93d9b7d7 2641static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2642{
2643 struct inet6_dev *idev;
2644 ASSERT_RTNL();
2645
2646 idev = __in6_dev_get(dev);
2647
93d9b7d7 2648 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2649 ipv6_mc_remap(idev);
93d9b7d7 2650 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2651 ipv6_mc_unmap(idev);
2652}
2653
1da177e4
LT		 2654static int addrconf_ifdown(struct net_device *dev, int how)
2655{
c346dca1 2656 struct net *net = dev_net(dev);
502a2ffd 2657 struct inet6_dev *idev;
2658 struct inet6_ifaddr *ifa;
2659 LIST_HEAD(keep_list);
4c5ff6a6 2660 int state;
1da177e4
LT		 2661
2662 ASSERT_RTNL();
2663
f3db4851 2664 rt6_ifdown(net, dev);
1da177e4
LT		 2665 neigh_ifdown(&nd_tbl, dev);
2666
2667 idev = __in6_dev_get(dev);
2668 if (idev == NULL)
2669 return -ENODEV;
2670
bcdd553f
SH		 2671 /*
2672 * Step 1: remove reference to ipv6 device from parent device.
2673 * Do not dev_put!
1da177e4 2674 */
439e2385 2675 if (how) {
1da177e4 2676 idev->dead = 1;
8814c4b5
YH		 2677
2678 /* protected by rtnl_lock */
2679 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2680
2681 /* Step 1.5: remove snmp6 entry */
2682 snmp6_unregister_dev(idev);
2683
2684 }
2685
1da177e4
LT		 2686 write_lock_bh(&idev->lock);
2687
bcdd553f 2688 /* Step 2: clear flags for stateless addrconf */
439e2385 2689 if (!how)
3c21edbd 2690 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2691
1da177e4 2692#ifdef CONFIG_IPV6_PRIVACY
439e2385 2693 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2694 in6_dev_put(idev);
2695
bcdd553f 2696 /* Step 3: clear tempaddr list */
372e6c8f 2697 while (!list_empty(&idev->tempaddr_list)) {
2698 ifa = list_first_entry(&idev->tempaddr_list,
2699 struct inet6_ifaddr, tmp_list);
2700 list_del(&ifa->tmp_list);
1da177e4
LT		 2701 write_unlock_bh(&idev->lock);
2702 spin_lock_bh(&ifa->lock);
2703
2704 if (ifa->ifpub) {
2705 in6_ifa_put(ifa->ifpub);
2706 ifa->ifpub = NULL;
2707 }
2708 spin_unlock_bh(&ifa->lock);
2709 in6_ifa_put(ifa);
2710 write_lock_bh(&idev->lock);
2711 }
2712#endif
8f37ada5 2713
502a2ffd 2714 while (!list_empty(&idev->addr_list)) {
2715 ifa = list_first_entry(&idev->addr_list,
2716 struct inet6_ifaddr, if_list);
84e8b803 2717 addrconf_del_timer(ifa);
2718
2719 /* If just doing link down, and address is permanent
2720 and not link-local, then retain it. */
bcdd553f 2721 if (!how &&
84e8b803 2722 (ifa->flags&IFA_F_PERMANENT) &&
2723 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2724 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2725
84e8b803 2726 /* If not doing DAD on this address, just keep it. */
2727 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2728 idev->cnf.accept_dad <= 0 ||
2729 (ifa->flags & IFA_F_NODAD))
2730 continue;
2731
2732 /* If it was tentative already, no need to notify */
2733 if (ifa->flags & IFA_F_TENTATIVE)
2734 continue;
2735
2736 /* Flag it for later restoration when link comes up */
2737 ifa->flags |= IFA_F_TENTATIVE;
f2344a13 2738 ifa->state = INET6_IFADDR_STATE_DAD;
4c5ff6a6 2739
27bdb2ab 2740 write_unlock_bh(&idev->lock);
4c5ff6a6
HX		 2741
2742 in6_ifa_hold(ifa);
dc2b99f7 2743 } else {
502a2ffd 2744 list_del(&ifa->if_list);
1da177e4 2745
27bdb2ab 2746 /* clear hash table */
2747 spin_lock_bh(&addrconf_hash_lock);
2748 hlist_del_init_rcu(&ifa->addr_lst);
27bdb2ab 2749 spin_unlock_bh(&addrconf_hash_lock);
4c5ff6a6
HX		 2750
2751 write_unlock_bh(&idev->lock);
2752 spin_lock_bh(&ifa->state_lock);
2753 state = ifa->state;
2754 ifa->state = INET6_IFADDR_STATE_DEAD;
2755 spin_unlock_bh(&ifa->state_lock);
2756
2757 if (state == INET6_IFADDR_STATE_DEAD)
2758 goto put_ifa;
27bdb2ab 2759 }
c2e21293 2760
84e8b803 2761 __ipv6_ifa_notify(RTM_DELADDR, ifa);
e9d3e084 2762 if (ifa->state == INET6_IFADDR_STATE_DEAD)
8595805a 2763 atomic_notifier_call_chain(&inet6addr_chain,
2764 NETDEV_DOWN, ifa);
4c5ff6a6
HX		 2765
2766put_ifa:
84e8b803 2767 in6_ifa_put(ifa);
dc2b99f7 2768
84e8b803 2769 write_lock_bh(&idev->lock);
1da177e4 2770 }
8f37ada5 2771
502a2ffd 2772 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2773
1da177e4
LT		 2774 write_unlock_bh(&idev->lock);
2775
2776 /* Step 5: Discard multicast list */
439e2385 2777 if (how)
1da177e4
LT		 2778 ipv6_mc_destroy_dev(idev);
2779 else
2780 ipv6_mc_down(idev);
2781
1da177e4 2782 idev->tstamp = jiffies;
1ab1457c 2783
bcdd553f 2784 /* Last: Shot the device (if unregistered) */
439e2385 2785 if (how) {
408c4768 2786 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2787 neigh_parms_release(&nd_tbl, idev->nd_parms);
2788 neigh_ifdown(&nd_tbl, dev);
2789 in6_dev_put(idev);
2790 }
2791 return 0;
2792}
2793
2794static void addrconf_rs_timer(unsigned long data)
2795{
2796 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2797 struct inet6_dev *idev = ifp->idev;
1da177e4 2798
5b2a1953 2799 read_lock(&idev->lock);
2800 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2801 goto out;
2802
5b2a1953 2803 if (idev->cnf.forwarding)
2804 goto out;
2805
2806 /* Announcement received after solicitation was sent */
2807 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2808 goto out;
1da177e4
LT		 2809
2810 spin_lock(&ifp->lock);
5b2a1953 2811 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2812 /* The wait after the last probe can be shorter */
2813 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2814 (ifp->probes == idev->cnf.rtr_solicits) ?
2815 idev->cnf.rtr_solicit_delay :
2816 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2817 spin_unlock(&ifp->lock);
2818
5b2a1953 2819 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2820 } else {
2821 spin_unlock(&ifp->lock);
2822 /*
2823 * Note: we do not support deprecated "all on-link"
2824 * assumption any longer.
2825 */
2826 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2827 idev->dev->name);
1da177e4
LT		 2828 }
2829
2830out:
5b2a1953 2831 read_unlock(&idev->lock);
1da177e4
LT		 2832 in6_ifa_put(ifp);
2833}
2834
2835/*
2836 * Duplicate Address Detection
2837 */
3c21edbd
YH		 2838static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2839{
2840 unsigned long rand_num;
2841 struct inet6_dev *idev = ifp->idev;
2842
95c385b4
NH		 2843 if (ifp->flags & IFA_F_OPTIMISTIC)
2844 rand_num = 0;
2845 else
2846 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2847
3c21edbd
YH		 2848 ifp->probes = idev->cnf.dad_transmits;
2849 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2850}
2851
e431b8c0 2852static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2853{
2854 struct inet6_dev *idev = ifp->idev;
2855 struct net_device *dev = idev->dev;
1da177e4
LT		 2856
2857 addrconf_join_solict(dev, &ifp->addr);
2858
1da177e4 2859 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2860
2861 read_lock_bh(&idev->lock);
622ccdf1 2862 spin_lock(&ifp->lock);
e9d3e084 2863 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2864 goto out;
1da177e4
LT		 2865
2866 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2867 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2868 !(ifp->flags&IFA_F_TENTATIVE) ||
2869 ifp->flags & IFA_F_NODAD) {
cc411d0b 2870 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2871 spin_unlock(&ifp->lock);
1da177e4
LT		 2872 read_unlock_bh(&idev->lock);
2873
2874 addrconf_dad_completed(ifp);
2875 return;
2876 }
2877
6732bade 2878 if (!(idev->if_flags & IF_READY)) {
21809faf 2879 spin_unlock(&ifp->lock);
6732bade 2880 read_unlock_bh(&idev->lock);
3c21edbd 2881 /*
590a9887 2882 * If the device is not ready:
3c21edbd
YH		 2883 * - keep it tentative if it is a permanent address.
2884 * - otherwise, kill it.
2885 */
2886 in6_ifa_hold(ifp);
cc411d0b 2887 addrconf_dad_stop(ifp, 0);
6732bade 2888 return;
3c21edbd 2889 }
95c385b4
NH		 2890
2891 /*
2892 * Optimistic nodes can start receiving
2893 * Frames right away
2894 */
e21e8467 2895 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2896 ip6_ins_rt(ifp->rt);
2897
6732bade 2898 addrconf_dad_kick(ifp);
1da177e4 2899out:
622ccdf1 2900 spin_unlock(&ifp->lock);
1da177e4
LT		 2901 read_unlock_bh(&idev->lock);
2902}
2903
2904static void addrconf_dad_timer(unsigned long data)
2905{
2906 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2907 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2908 struct in6_addr mcaddr;
2909
f2344a13
HX		 2910 if (!ifp->probes && addrconf_dad_end(ifp))
2911 goto out;
2912
122e4519 2913 read_lock(&idev->lock);
2914 if (idev->dead || !(idev->if_flags & IF_READY)) {
2915 read_unlock(&idev->lock);
1da177e4
LT		 2916 goto out;
2917 }
21809faf 2918
2919 spin_lock(&ifp->lock);
622ccdf1
HX		 2920 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2921 spin_unlock(&ifp->lock);
2922 read_unlock(&idev->lock);
2923 goto out;
2924 }
2925
1da177e4
LT		 2926 if (ifp->probes == 0) {
2927 /*
2928 * DAD was successful
2929 */
2930
cc411d0b 2931 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2932 spin_unlock(&ifp->lock);
122e4519 2933 read_unlock(&idev->lock);
1da177e4
LT		 2934
2935 addrconf_dad_completed(ifp);
2936
2937 goto out;
2938 }
2939
2940 ifp->probes--;
2941 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2942 spin_unlock(&ifp->lock);
122e4519 2943 read_unlock(&idev->lock);
1da177e4
LT		 2944
2945 /* send a neighbour solicitation for our addr */
1da177e4 2946 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2947 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2948out:
2949 in6_ifa_put(ifp);
2950}
2951
2952static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2953{
e21e8467 2954 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2955
2956 /*
2957 * Configure the address for reception. Now it is valid.
2958 */
2959
2960 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2961
2962 /* If added prefix is link local and forwarding is off,
2963 start sending router solicitations.
2964 */
2965
c3bccac2
TG		 2966 if ((ifp->idev->cnf.forwarding == 0 ||
2967 ifp->idev->cnf.forwarding == 2) &&
1da177e4
LT		 2968 ifp->idev->cnf.rtr_solicits > 0 &&
2969 (dev->flags&IFF_LOOPBACK) == 0 &&
2970 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2971 /*
2972 * If a host as already performed a random delay
2973 * [...] as part of DAD [...] there is no need
2974 * to delay again before sending the first RS
2975 */
f3ee4010 2976 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2977
2978 spin_lock_bh(&ifp->lock);
2979 ifp->probes = 1;
2980 ifp->idev->if_flags |= IF_RS_SENT;
2981 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2982 spin_unlock_bh(&ifp->lock);
2983 }
2984}
2985
e21e8467
SH		 2986static void addrconf_dad_run(struct inet6_dev *idev)
2987{
c5e33bdd
YH		 2988 struct inet6_ifaddr *ifp;
2989
2990 read_lock_bh(&idev->lock);
502a2ffd 2991 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2992 spin_lock(&ifp->lock);
f2344a13
HX		 2993 if (ifp->flags & IFA_F_TENTATIVE &&
2994 ifp->state == INET6_IFADDR_STATE_DAD)
2995 addrconf_dad_kick(ifp);
21809faf 2996 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2997 }
2998 read_unlock_bh(&idev->lock);
2999}
3000
1da177e4
LT		 3001#ifdef CONFIG_PROC_FS
3002struct if6_iter_state {
3c40090a 3003 struct seq_net_private p;
1da177e4
LT		 3004 int bucket;
3005};
3006
3007static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3008{
3009 struct inet6_ifaddr *ifa = NULL;
3010 struct if6_iter_state *state = seq->private;
1218854a 3011 struct net *net = seq_file_net(seq);
1da177e4
LT		 3012
3013 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3014 struct hlist_node *n;
4f70ecca 3015 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 3016 addr_lst)
c2e21293 3017 if (net_eq(dev_net(ifa->idev->dev), net))
3018 return ifa;
1da177e4 3019 }
c2e21293 3020 return NULL;
1da177e4
LT		 3021}
3022
c2e21293 3023static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3024 struct inet6_ifaddr *ifa)
1da177e4
LT		 3025{
3026 struct if6_iter_state *state = seq->private;
1218854a 3027 struct net *net = seq_file_net(seq);
c2e21293 3028 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3029
4f70ecca 3030 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 3031 if (net_eq(dev_net(ifa->idev->dev), net))
3032 return ifa;
3c40090a 3033
c2e21293 3034 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3035 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3036 &inet6_addr_lst[state->bucket], addr_lst) {
3037 if (net_eq(dev_net(ifa->idev->dev), net))
3038 return ifa;
3039 }
1da177e4 3040 }
3c40090a 3041
c2e21293 3042 return NULL;
1da177e4
LT		 3043}
3044
3045static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3046{
3047 struct inet6_ifaddr *ifa = if6_get_first(seq);
3048
3049 if (ifa)
e21e8467 3050 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3051 --pos;
3052 return pos ? NULL : ifa;
3053}
3054
3055static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3056 __acquires(rcu_bh)
1da177e4 3057{
5c578aed 3058 rcu_read_lock_bh();
1da177e4
LT		 3059 return if6_get_idx(seq, *pos);
3060}
3061
3062static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3063{
3064 struct inet6_ifaddr *ifa;
3065
3066 ifa = if6_get_next(seq, v);
3067 ++*pos;
3068 return ifa;
3069}
3070
3071static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3072 __releases(rcu_bh)
1da177e4 3073{
5c578aed 3074 rcu_read_unlock_bh();
1da177e4
LT		 3075}
3076
3077static int if6_seq_show(struct seq_file *seq, void *v)
3078{
3079 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3080 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3081 &ifp->addr,
1da177e4
LT		 3082 ifp->idev->dev->ifindex,
3083 ifp->prefix_len,
3084 ifp->scope,
3085 ifp->flags,
3086 ifp->idev->dev->name);
3087 return 0;
3088}
3089
56b3d975 3090static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3091 .start = if6_seq_start,
3092 .next = if6_seq_next,
3093 .show = if6_seq_show,
3094 .stop = if6_seq_stop,
3095};
3096
3097static int if6_seq_open(struct inode *inode, struct file *file)
3098{
3c40090a
DL		 3099 return seq_open_net(inode, file, &if6_seq_ops,
3100 sizeof(struct if6_iter_state));
1da177e4
LT		 3101}
3102
9a32144e 3103static const struct file_operations if6_fops = {
1da177e4
LT		 3104 .owner = THIS_MODULE,
3105 .open = if6_seq_open,
3106 .read = seq_read,
3107 .llseek = seq_lseek,
3c40090a 3108 .release = seq_release_net,
1da177e4
LT		 3109};
3110
2c8c1e72 3111static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3112{
3c40090a 3113 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3114 return -ENOMEM;
3115 return 0;
3116}
3117
2c8c1e72 3118static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3119{
3120 proc_net_remove(net, "if_inet6");
3121}
3122
3123static struct pernet_operations if6_proc_net_ops = {
3124 .init = if6_proc_net_init,
3125 .exit = if6_proc_net_exit,
3126};
3127
3128int __init if6_proc_init(void)
3129{
3130 return register_pernet_subsys(&if6_proc_net_ops);
3131}
3132
1da177e4
LT		 3133void if6_proc_exit(void)
3134{
3c40090a 3135 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3136}
3137#endif /* CONFIG_PROC_FS */
3138
59fbb3a6 3139#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3140/* Check if address is a home address configured on any interface. */
389f6612 3141int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3142{
3143 int ret = 0;
c2e21293 3144 struct inet6_ifaddr *ifp = NULL;
3145 struct hlist_node *n;
3a88a81d 3146 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3147
5c578aed 3148 rcu_read_lock_bh();
4f70ecca 3149 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3150 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3151 continue;
caad295f 3152 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3153 (ifp->flags & IFA_F_HOMEADDRESS)) {
3154 ret = 1;
3155 break;
3156 }
3157 }
5c578aed 3158 rcu_read_unlock_bh();
3b9f9a1c
NT		 3159 return ret;
3160}
3161#endif
3162
1da177e4
LT		 3163/*
3164 * Periodic address status verification
3165 */
3166
3167static void addrconf_verify(unsigned long foo)
3168{
b2db7564 3169 unsigned long now, next, next_sec, next_sched;
1da177e4 3170 struct inet6_ifaddr *ifp;
c2e21293 3171 struct hlist_node *node;
1da177e4
LT		 3172 int i;
3173
5c578aed 3174 rcu_read_lock_bh();
3175 spin_lock(&addrconf_verify_lock);
1da177e4 3176 now = jiffies;
b2db7564 3177 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3178
3179 del_timer(&addr_chk_timer);
3180
bcdd553f 3181 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3182restart:
4f70ecca 3183 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3184 &inet6_addr_lst[i], addr_lst) {
1da177e4 3185 unsigned long age;
1da177e4
LT		 3186
3187 if (ifp->flags & IFA_F_PERMANENT)
3188 continue;
3189
3190 spin_lock(&ifp->lock);
b2db7564
YH		 3191 /* We try to batch several events at once. */
3192 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3193
8f27ebb9
YH		 3194 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3195 age >= ifp->valid_lft) {
1da177e4
LT		 3196 spin_unlock(&ifp->lock);
3197 in6_ifa_hold(ifp);
1da177e4
LT		 3198 ipv6_del_addr(ifp);
3199 goto restart;
8f27ebb9
YH		 3200 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3201 spin_unlock(&ifp->lock);
3202 continue;
1da177e4 3203 } else if (age >= ifp->prefered_lft) {
a1ed0526 3204 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3205 int deprecate = 0;
3206
3207 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3208 deprecate = 1;
3209 ifp->flags |= IFA_F_DEPRECATED;
3210 }
3211
3212 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3213 next = ifp->tstamp + ifp->valid_lft * HZ;
3214
3215 spin_unlock(&ifp->lock);
3216
3217 if (deprecate) {
3218 in6_ifa_hold(ifp);
1da177e4
LT		 3219
3220 ipv6_ifa_notify(0, ifp);
3221 in6_ifa_put(ifp);
3222 goto restart;
3223 }
3224#ifdef CONFIG_IPV6_PRIVACY
3225 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3226 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3227 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3228 ifp->idev->cnf.dad_transmits *
3229 ifp->idev->nd_parms->retrans_time / HZ;
3230
1da177e4
LT		 3231 if (age >= ifp->prefered_lft - regen_advance) {
3232 struct inet6_ifaddr *ifpub = ifp->ifpub;
3233 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3234 next = ifp->tstamp + ifp->prefered_lft * HZ;
3235 if (!ifp->regen_count && ifpub) {
3236 ifp->regen_count++;
3237 in6_ifa_hold(ifp);
3238 in6_ifa_hold(ifpub);
3239 spin_unlock(&ifp->lock);
5c578aed 3240
291d809b
HY		 3241 spin_lock(&ifpub->lock);
3242 ifpub->regen_count = 0;
3243 spin_unlock(&ifpub->lock);
1da177e4
LT		 3244 ipv6_create_tempaddr(ifpub, ifp);
3245 in6_ifa_put(ifpub);
3246 in6_ifa_put(ifp);
3247 goto restart;
3248 }
3249 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3250 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3251 spin_unlock(&ifp->lock);
3252#endif
3253 } else {
3254 /* ifp->prefered_lft <= ifp->valid_lft */
3255 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3256 next = ifp->tstamp + ifp->prefered_lft * HZ;
3257 spin_unlock(&ifp->lock);
3258 }
3259 }
1da177e4
LT		 3260 }
3261
b2db7564
YH		 3262 next_sec = round_jiffies_up(next);
3263 next_sched = next;
3264
3265 /* If rounded timeout is accurate enough, accept it. */
3266 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3267 next_sched = next_sec;
3268
3269 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3270 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3271 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3272
3273 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3274 now, next, next_sec, next_sched));
3275
3276 addr_chk_timer.expires = next_sched;
1da177e4 3277 add_timer(&addr_chk_timer);
5c578aed 3278 spin_unlock(&addrconf_verify_lock);
3279 rcu_read_unlock_bh();
1da177e4
LT		 3280}
3281
461d8837
TG		 3282static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3283{
3284 struct in6_addr *pfx = NULL;
3285
3286 if (addr)
3287 pfx = nla_data(addr);
3288
3289 if (local) {
3290 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3291 pfx = NULL;
3292 else
3293 pfx = nla_data(local);
3294 }
3295
3296 return pfx;
3297}
3298
ef7c79ed 3299static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3300 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3301 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3302 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3303};
3304
1da177e4
LT		 3305static int
3306inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3307{
3b1e0a65 3308 struct net *net = sock_net(skb->sk);
b933f716
TG		 3309 struct ifaddrmsg *ifm;
3310 struct nlattr *tb[IFA_MAX+1];
1da177e4 3311 struct in6_addr *pfx;
b933f716 3312 int err;
1da177e4 3313
b933f716
TG		 3314 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3315 if (err < 0)
3316 return err;
3317
3318 ifm = nlmsg_data(nlh);
3319 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3320 if (pfx == NULL)
3321 return -EINVAL;
3322
af284937 3323 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3324}
3325
55ebaef1
NT		 3326static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3327 u32 prefered_lft, u32 valid_lft)
081bba5b 3328{
6f704992
YH		 3329 u32 flags;
3330 clock_t expires;
4bed72e4 3331 unsigned long timeout;
46d48046 3332
081bba5b
NT		 3333 if (!valid_lft || (prefered_lft > valid_lft))
3334 return -EINVAL;
3335
4bed72e4
YH		 3336 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3337 if (addrconf_finite_timeout(timeout)) {
3338 expires = jiffies_to_clock_t(timeout * HZ);
3339 valid_lft = timeout;
6f704992 3340 flags = RTF_EXPIRES;
4bed72e4
YH		 3341 } else {
3342 expires = 0;
3343 flags = 0;
3344 ifa_flags |= IFA_F_PERMANENT;
6f704992 3345 }
081bba5b 3346
4bed72e4
YH		 3347 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3348 if (addrconf_finite_timeout(timeout)) {
3349 if (timeout == 0)
3350 ifa_flags |= IFA_F_DEPRECATED;
3351 prefered_lft = timeout;
3352 }
081bba5b
NT		 3353
3354 spin_lock_bh(&ifp->lock);
3b9f9a1c 3355 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3356 ifp->tstamp = jiffies;
3357 ifp->valid_lft = valid_lft;
3358 ifp->prefered_lft = prefered_lft;
3359
3360 spin_unlock_bh(&ifp->lock);
3361 if (!(ifp->flags&IFA_F_TENTATIVE))
3362 ipv6_ifa_notify(0, ifp);
081bba5b 3363
46d48046 3364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3365 expires, flags);
081bba5b
NT		 3366 addrconf_verify(0);
3367
3368 return 0;
3369}
3370
1da177e4
LT		 3371static int
3372inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3373{
3b1e0a65 3374 struct net *net = sock_net(skb->sk);
461d8837
TG		 3375 struct ifaddrmsg *ifm;
3376 struct nlattr *tb[IFA_MAX+1];
1da177e4 3377 struct in6_addr *pfx;
7198f8ce
TG		 3378 struct inet6_ifaddr *ifa;
3379 struct net_device *dev;
55ebaef1
NT		 3380 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3381 u8 ifa_flags;
461d8837 3382 int err;
1da177e4 3383
461d8837
TG		 3384 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3385 if (err < 0)
3386 return err;
3387
3388 ifm = nlmsg_data(nlh);
3389 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3390 if (pfx == NULL)
3391 return -EINVAL;
3392
461d8837 3393 if (tb[IFA_CACHEINFO]) {
0778769d 3394 struct ifa_cacheinfo *ci;
461d8837
TG		 3395
3396 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3397 valid_lft = ci->ifa_valid;
461d8837
TG		 3398 preferred_lft = ci->ifa_prefered;
3399 } else {
3400 preferred_lft = INFINITY_LIFE_TIME;
3401 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3402 }
3403
af284937 3404 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3405 if (dev == NULL)
3406 return -ENODEV;
3407
55ebaef1 3408 /* We ignore other flags so far. */
3b9f9a1c 3409 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3410
1cab3da6 3411 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3412 if (ifa == NULL) {
3413 /*
3414 * It would be best to check for !NLM_F_CREATE here but
3415 * userspace alreay relies on not having to provide this.
3416 */
af284937
DL		 3417 return inet6_addr_add(net, ifm->ifa_index, pfx,
3418 ifm->ifa_prefixlen, ifa_flags,
3419 preferred_lft, valid_lft);
081bba5b
NT		 3420 }
3421
7198f8ce
TG		 3422 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3423 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3424 err = -EEXIST;
3425 else
55ebaef1 3426 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3427
3428 in6_ifa_put(ifa);
3429
3430 return err;
1da177e4
LT		 3431}
3432
101bb229
TG		 3433static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3434 u8 scope, int ifindex)
3435{
3436 struct ifaddrmsg *ifm;
3437
3438 ifm = nlmsg_data(nlh);
3439 ifm->ifa_family = AF_INET6;
3440 ifm->ifa_prefixlen = prefixlen;
3441 ifm->ifa_flags = flags;
3442 ifm->ifa_scope = scope;
3443 ifm->ifa_index = ifindex;
3444}
3445
85486af0
TG		 3446static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3447 unsigned long tstamp, u32 preferred, u32 valid)
3448{
3449 struct ifa_cacheinfo ci;
3450
3451 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3452 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3453 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3454 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3455 ci.ifa_prefered = preferred;
3456 ci.ifa_valid = valid;
3457
3458 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3459}
3460
101bb229
TG		 3461static inline int rt_scope(int ifa_scope)
3462{
3463 if (ifa_scope & IFA_HOST)
3464 return RT_SCOPE_HOST;
3465 else if (ifa_scope & IFA_LINK)
3466 return RT_SCOPE_LINK;
3467 else if (ifa_scope & IFA_SITE)
3468 return RT_SCOPE_SITE;
3469 else
3470 return RT_SCOPE_UNIVERSE;
3471}
3472
0ab6803b
TG		 3473static inline int inet6_ifaddr_msgsize(void)
3474{
339bf98f
TG		 3475 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3476 + nla_total_size(16) /* IFA_ADDRESS */
3477 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3478}
c5396a31 3479
1da177e4 3480static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3481 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3482{
1da177e4 3483 struct nlmsghdr *nlh;
85486af0 3484 u32 preferred, valid;
1da177e4 3485
0ab6803b
TG		 3486 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3487 if (nlh == NULL)
26932566 3488 return -EMSGSIZE;
0ab6803b 3489
101bb229
TG		 3490 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3491 ifa->idev->dev->ifindex);
3492
1da177e4 3493 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3494 preferred = ifa->prefered_lft;
3495 valid = ifa->valid_lft;
3496 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3497 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3498 if (preferred > tval)
3499 preferred -= tval;
3500 else
3501 preferred = 0;
f56619fc
BH		 3502 if (valid != INFINITY_LIFE_TIME) {
3503 if (valid > tval)
3504 valid -= tval;
3505 else
3506 valid = 0;
3507 }
1da177e4
LT		 3508 }
3509 } else {
85486af0
TG		 3510 preferred = INFINITY_LIFE_TIME;
3511 valid = INFINITY_LIFE_TIME;
3512 }
3513
0ab6803b 3514 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3515 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3516 nlmsg_cancel(skb, nlh);
3517 return -EMSGSIZE;
3518 }
1da177e4 3519
0ab6803b 3520 return nlmsg_end(skb, nlh);
1da177e4
LT		 3521}
3522
3523static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3524 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3525{
1da177e4 3526 struct nlmsghdr *nlh;
101bb229
TG		 3527 u8 scope = RT_SCOPE_UNIVERSE;
3528 int ifindex = ifmca->idev->dev->ifindex;
3529
3530 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3531 scope = RT_SCOPE_SITE;
1da177e4 3532
0ab6803b
TG		 3533 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3534 if (nlh == NULL)
26932566 3535 return -EMSGSIZE;
85486af0 3536
0ab6803b
TG		 3537 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3538 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3539 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3540 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3541 nlmsg_cancel(skb, nlh);
3542 return -EMSGSIZE;
3543 }
85486af0 3544
0ab6803b 3545 return nlmsg_end(skb, nlh);
1da177e4
LT		 3546}
3547
3548static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3549 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3550{
1da177e4 3551 struct nlmsghdr *nlh;
101bb229
TG		 3552 u8 scope = RT_SCOPE_UNIVERSE;
3553 int ifindex = ifaca->aca_idev->dev->ifindex;
3554
3555 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3556 scope = RT_SCOPE_SITE;
1da177e4 3557
0ab6803b
TG		 3558 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3559 if (nlh == NULL)
26932566 3560 return -EMSGSIZE;
85486af0 3561
0ab6803b
TG		 3562 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3563 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3564 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3565 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3566 nlmsg_cancel(skb, nlh);
3567 return -EMSGSIZE;
3568 }
1da177e4 3569
0ab6803b 3570 return nlmsg_end(skb, nlh);
1da177e4
LT		 3571}
3572
e21e8467 3573enum addr_type_t {
1da177e4
LT		 3574 UNICAST_ADDR,
3575 MULTICAST_ADDR,
3576 ANYCAST_ADDR,
3577};
3578
234b27c3
ED		 3579/* called with rcu_read_lock() */
3580static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3581 struct netlink_callback *cb, enum addr_type_t type,
3582 int s_ip_idx, int *p_ip_idx)
3583{
234b27c3
ED		 3584 struct ifmcaddr6 *ifmca;
3585 struct ifacaddr6 *ifaca;
3586 int err = 1;
3587 int ip_idx = *p_ip_idx;
3588
3589 read_lock_bh(&idev->lock);
3590 switch (type) {
502a2ffd 3591 case UNICAST_ADDR: {
3592 struct inet6_ifaddr *ifa;
3593
234b27c3 3594 /* unicast address incl. temp addr */
502a2ffd 3595 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3596 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3597 continue;
3598 err = inet6_fill_ifaddr(skb, ifa,
3599 NETLINK_CB(cb->skb).pid,
3600 cb->nlh->nlmsg_seq,
3601 RTM_NEWADDR,
3602 NLM_F_MULTI);
3603 if (err <= 0)
3604 break;
3605 }
3606 break;
502a2ffd 3607 }
234b27c3
ED		 3608 case MULTICAST_ADDR:
3609 /* multicast address */
3610 for (ifmca = idev->mc_list; ifmca;
3611 ifmca = ifmca->next, ip_idx++) {
3612 if (ip_idx < s_ip_idx)
3613 continue;
3614 err = inet6_fill_ifmcaddr(skb, ifmca,
3615 NETLINK_CB(cb->skb).pid,
3616 cb->nlh->nlmsg_seq,
3617 RTM_GETMULTICAST,
3618 NLM_F_MULTI);
3619 if (err <= 0)
3620 break;
3621 }
3622 break;
3623 case ANYCAST_ADDR:
3624 /* anycast address */
3625 for (ifaca = idev->ac_list; ifaca;
3626 ifaca = ifaca->aca_next, ip_idx++) {
3627 if (ip_idx < s_ip_idx)
3628 continue;
3629 err = inet6_fill_ifacaddr(skb, ifaca,
3630 NETLINK_CB(cb->skb).pid,
3631 cb->nlh->nlmsg_seq,
3632 RTM_GETANYCAST,
3633 NLM_F_MULTI);
3634 if (err <= 0)
3635 break;
3636 }
3637 break;
3638 default:
3639 break;
3640 }
3641 read_unlock_bh(&idev->lock);
3642 *p_ip_idx = ip_idx;
3643 return err;
3644}
3645
1da177e4
LT		 3646static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3647 enum addr_type_t type)
3648{
234b27c3
ED		 3649 struct net *net = sock_net(skb->sk);
3650 int h, s_h;
1da177e4
LT		 3651 int idx, ip_idx;
3652 int s_idx, s_ip_idx;
1da177e4 3653 struct net_device *dev;
234b27c3
ED		 3654 struct inet6_dev *idev;
3655 struct hlist_head *head;
3656 struct hlist_node *node;
1ab1457c 3657
234b27c3
ED		 3658 s_h = cb->args[0];
3659 s_idx = idx = cb->args[1];
3660 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3661
234b27c3
ED		 3662 rcu_read_lock();
3663 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3664 idx = 0;
3665 head = &net->dev_index_head[h];
3666 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3667 if (idx < s_idx)
3668 goto cont;
4b97efdf 3669 if (h > s_h || idx > s_idx)
234b27c3
ED		 3670 s_ip_idx = 0;
3671 ip_idx = 0;
e21e8467
SH		 3672 idev = __in6_dev_get(dev);
3673 if (!idev)
234b27c3
ED		 3674 goto cont;
3675
3676 if (in6_dump_addrs(idev, skb, cb, type,
3677 s_ip_idx, &ip_idx) <= 0)
3678 goto done;
7562f876 3679cont:
234b27c3
ED		 3680 idx++;
3681 }
1da177e4 3682 }
234b27c3
ED		 3683done:
3684 rcu_read_unlock();
3685 cb->args[0] = h;
3686 cb->args[1] = idx;
3687 cb->args[2] = ip_idx;
3688
1da177e4
LT		 3689 return skb->len;
3690}
3691
3692static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693{
3694 enum addr_type_t type = UNICAST_ADDR;
b854272b 3695
1da177e4
LT		 3696 return inet6_dump_addr(skb, cb, type);
3697}
3698
3699static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3700{
3701 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3702
1da177e4
LT		 3703 return inet6_dump_addr(skb, cb, type);
3704}
3705
3706
3707static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708{
3709 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3710
1da177e4
LT		 3711 return inet6_dump_addr(skb, cb, type);
3712}
3713
1b29fc2c
TG		 3714static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3715 void *arg)
6c223828 3716{
3b1e0a65 3717 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3718 struct ifaddrmsg *ifm;
3719 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3720 struct in6_addr *addr = NULL;
3721 struct net_device *dev = NULL;
3722 struct inet6_ifaddr *ifa;
3723 struct sk_buff *skb;
6c223828
NT		 3724 int err;
3725
1b29fc2c
TG		 3726 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3727 if (err < 0)
3728 goto errout;
3729
3730 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3731 if (addr == NULL) {
3732 err = -EINVAL;
3733 goto errout;
6c223828 3734 }
6c223828 3735
1b29fc2c 3736 ifm = nlmsg_data(nlh);
6c223828 3737 if (ifm->ifa_index)
6fda7350 3738 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3739
e21e8467
SH		 3740 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3741 if (!ifa) {
1b29fc2c
TG		 3742 err = -EADDRNOTAVAIL;
3743 goto errout;
3744 }
6c223828 3745
e21e8467
SH		 3746 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3747 if (!skb) {
6c223828 3748 err = -ENOBUFS;
1b29fc2c 3749 goto errout_ifa;
6c223828
NT		 3750 }
3751
6c223828
NT		 3752 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3753 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3754 if (err < 0) {
3755 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3756 WARN_ON(err == -EMSGSIZE);
3757 kfree_skb(skb);
3758 goto errout_ifa;
3759 }
6fda7350 3760 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3761errout_ifa:
6c223828 3762 in6_ifa_put(ifa);
1b29fc2c 3763errout:
6c223828 3764 return err;
6c223828
NT		 3765}
3766
1da177e4
LT		 3767static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3768{
3769 struct sk_buff *skb;
c346dca1 3770 struct net *net = dev_net(ifa->idev->dev);
5d620266 3771 int err = -ENOBUFS;
1da177e4 3772
0ab6803b 3773 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3774 if (skb == NULL)
3775 goto errout;
3776
3777 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3778 if (err < 0) {
3779 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3780 WARN_ON(err == -EMSGSIZE);
3781 kfree_skb(skb);
3782 goto errout;
3783 }
1ce85fe4
PNA		 3784 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3785 return;
5d620266
TG		 3786errout:
3787 if (err < 0)
6fda7350 3788 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3789}
3790
b6f99a21 3791static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3792 __s32 *array, int bytes)
3793{
04561c1f
TG		 3794 BUG_ON(bytes < (DEVCONF_MAX * 4));
3795
1da177e4
LT		 3796 memset(array, 0, bytes);
3797 array[DEVCONF_FORWARDING] = cnf->forwarding;
3798 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3799 array[DEVCONF_MTU6] = cnf->mtu6;
3800 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3801 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3802 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3803 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3804 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3805 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3806 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3807 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3808#ifdef CONFIG_IPV6_PRIVACY
3809 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3810 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3811 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3812 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3813 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3814#endif
3815 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3816 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3817 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3818#ifdef CONFIG_IPV6_ROUTER_PREF
3819 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3820 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3821#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3823#endif
930d6ff2 3824#endif
fbea49e1 3825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3827#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3829#endif
7bc570c8
YH		 3830#ifdef CONFIG_IPV6_MROUTE
3831 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3832#endif
778d80be 3833 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3834 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3835 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3836}
3837
339bf98f
TG		 3838static inline size_t inet6_if_nlmsg_size(void)
3839{
3840 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3841 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3842 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3843 + nla_total_size(4) /* IFLA_MTU */
3844 + nla_total_size(4) /* IFLA_LINK */
3845 + nla_total_size( /* IFLA_PROTINFO */
3846 nla_total_size(4) /* IFLA_INET6_FLAGS */
3847 + nla_total_size(sizeof(struct ifla_cacheinfo))
3848 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3849 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3850 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3851 );
3852}
c5396a31 3853
7d720c3e
TH		 3854static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3855 int items, int bytes)
7f7d9a6b
HX		 3856{
3857 int i;
3858 int pad = bytes - sizeof(u64) * items;
3859 BUG_ON(pad < 0);
3860
3861 /* Use put_unaligned() because stats may not be aligned for u64. */
3862 put_unaligned(items, &stats[0]);
3863 for (i = 1; i < items; i++)
3864 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3865
3866 memset(&stats[items], 0, pad);
3867}
3868
4ce3c183
ED		 3869static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3870 int items, int bytes, size_t syncpoff)
3871{
3872 int i;
3873 int pad = bytes - sizeof(u64) * items;
3874 BUG_ON(pad < 0);
3875
3876 /* Use put_unaligned() because stats may not be aligned for u64. */
3877 put_unaligned(items, &stats[0]);
3878 for (i = 1; i < items; i++)
3879 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3880
3881 memset(&stats[items], 0, pad);
3882}
3883
7f7d9a6b
HX		 3884static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3885 int bytes)
3886{
e21e8467 3887 switch (attrtype) {
7f7d9a6b 3888 case IFLA_INET6_STATS:
4ce3c183
ED		 3889 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3890 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3891 break;
3892 case IFLA_INET6_ICMP6STATS:
7d720c3e 3893 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3894 break;
3895 }
3896}
3897
1ab1457c 3898static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3899 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3900{
04561c1f 3901 struct net_device *dev = idev->dev;
bf99f1bd 3902 struct nlattr *nla;
04561c1f
TG		 3903 struct ifinfomsg *hdr;
3904 struct nlmsghdr *nlh;
3905 void *protoinfo;
3906 struct ifla_cacheinfo ci;
3907
3908 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3909 if (nlh == NULL)
26932566 3910 return -EMSGSIZE;
04561c1f
TG		 3911
3912 hdr = nlmsg_data(nlh);
3913 hdr->ifi_family = AF_INET6;
3914 hdr->__ifi_pad = 0;
3915 hdr->ifi_type = dev->type;
3916 hdr->ifi_index = dev->ifindex;
3917 hdr->ifi_flags = dev_get_flags(dev);
3918 hdr->ifi_change = 0;
3919
3920 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3921
3922 if (dev->addr_len)
04561c1f 3923 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3924
04561c1f 3925 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3926 if (dev->ifindex != dev->iflink)
04561c1f 3927 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3928
04561c1f
TG		 3929 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3930 if (protoinfo == NULL)
3931 goto nla_put_failure;
1da177e4 3932
04561c1f 3933 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3934
1da177e4
LT		 3935 ci.max_reasm_len = IPV6_MAXPLEN;
3936 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3937 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3938 ci.reachable_time = idev->nd_parms->reachable_time;
3939 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3940 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3941
bf99f1bd
YH		 3942 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3943 if (nla == NULL)
04561c1f 3944 goto nla_put_failure;
bf99f1bd 3945 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3946
bf99f1bd
YH		 3947 /* XXX - MC not implemented */
3948
3949 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3950 if (nla == NULL)
3951 goto nla_put_failure;
3952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3953
3954 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3955 if (nla == NULL)
3956 goto nla_put_failure;
3957 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3958
04561c1f
TG		 3959 nla_nest_end(skb, protoinfo);
3960 return nlmsg_end(skb, nlh);
1da177e4 3961
04561c1f 3962nla_put_failure:
26932566
PM		 3963 nlmsg_cancel(skb, nlh);
3964 return -EMSGSIZE;
1da177e4
LT		 3965}
3966
3967static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3968{
3b1e0a65 3969 struct net *net = sock_net(skb->sk);
84d2697d 3970 int h, s_h;
434a8a58 3971 int idx = 0, s_idx;
1da177e4
LT		 3972 struct net_device *dev;
3973 struct inet6_dev *idev;
84d2697d
ED		 3974 struct hlist_head *head;
3975 struct hlist_node *node;
1da177e4 3976
84d2697d
ED		 3977 s_h = cb->args[0];
3978 s_idx = cb->args[1];
3979
3980 rcu_read_lock();
3981 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3982 idx = 0;
3983 head = &net->dev_index_head[h];
3984 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3985 if (idx < s_idx)
3986 goto cont;
3987 idev = __in6_dev_get(dev);
3988 if (!idev)
3989 goto cont;
3990 if (inet6_fill_ifinfo(skb, idev,
3991 NETLINK_CB(cb->skb).pid,
3992 cb->nlh->nlmsg_seq,
3993 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3994 goto out;
7562f876 3995cont:
84d2697d
ED		 3996 idx++;
3997 }
1da177e4 3998 }
84d2697d
ED		 3999out:
4000 rcu_read_unlock();
4001 cb->args[1] = idx;
4002 cb->args[0] = h;
1da177e4
LT		 4003
4004 return skb->len;
4005}
4006
4007void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4008{
4009 struct sk_buff *skb;
c346dca1 4010 struct net *net = dev_net(idev->dev);
8d7a76c9 4011 int err = -ENOBUFS;
1ab1457c 4012
339bf98f 4013 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4014 if (skb == NULL)
4015 goto errout;
4016
4017 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4018 if (err < 0) {
4019 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4020 WARN_ON(err == -EMSGSIZE);
4021 kfree_skb(skb);
4022 goto errout;
4023 }
1ce85fe4
PNA		 4024 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4025 return;
8d7a76c9
TG		 4026errout:
4027 if (err < 0)
6fda7350 4028 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 4029}
4030
339bf98f
TG		 4031static inline size_t inet6_prefix_nlmsg_size(void)
4032{
4033 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4034 + nla_total_size(sizeof(struct in6_addr))
4035 + nla_total_size(sizeof(struct prefix_cacheinfo));
4036}
c5396a31 4037
1da177e4 4038static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4039 struct prefix_info *pinfo, u32 pid, u32 seq,
4040 int event, unsigned int flags)
1da177e4 4041{
6051e2f4
TG		 4042 struct prefixmsg *pmsg;
4043 struct nlmsghdr *nlh;
1da177e4
LT		 4044 struct prefix_cacheinfo ci;
4045
6051e2f4
TG		 4046 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4047 if (nlh == NULL)
26932566 4048 return -EMSGSIZE;
6051e2f4
TG		 4049
4050 pmsg = nlmsg_data(nlh);
1da177e4 4051 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4052 pmsg->prefix_pad1 = 0;
4053 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4054 pmsg->prefix_ifindex = idev->dev->ifindex;
4055 pmsg->prefix_len = pinfo->prefix_len;
4056 pmsg->prefix_type = pinfo->type;
8a47077a 4057 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4058 pmsg->prefix_flags = 0;
4059 if (pinfo->onlink)
4060 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4061 if (pinfo->autoconf)
4062 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4063
6051e2f4 4064 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4065
4066 ci.preferred_time = ntohl(pinfo->prefered);
4067 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4068 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4069
6051e2f4 4070 return nlmsg_end(skb, nlh);
1da177e4 4071
6051e2f4 4072nla_put_failure:
26932566
PM		 4073 nlmsg_cancel(skb, nlh);
4074 return -EMSGSIZE;
1da177e4
LT		 4075}
4076
1ab1457c 4077static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4078 struct prefix_info *pinfo)
4079{
4080 struct sk_buff *skb;
c346dca1 4081 struct net *net = dev_net(idev->dev);
8c384bfa 4082 int err = -ENOBUFS;
1da177e4 4083
339bf98f 4084 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4085 if (skb == NULL)
4086 goto errout;
4087
4088 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4089 if (err < 0) {
4090 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4091 WARN_ON(err == -EMSGSIZE);
4092 kfree_skb(skb);
4093 goto errout;
4094 }
1ce85fe4
PNA		 4095 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4096 return;
8c384bfa
TG		 4097errout:
4098 if (err < 0)
6fda7350 4099 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4100}
4101
1da177e4
LT		 4102static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4103{
4104 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4105
4106 switch (event) {
4107 case RTM_NEWADDR:
95c385b4
NH		 4108 /*
4109 * If the address was optimistic
4110 * we inserted the route at the start of
4111 * our DAD process, so we don't need
4112 * to do it again
4113 */
4114 if (!(ifp->rt->rt6i_node))
4115 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4116 if (ifp->idev->cnf.forwarding)
4117 addrconf_join_anycast(ifp);
4118 break;
4119 case RTM_DELADDR:
4120 if (ifp->idev->cnf.forwarding)
4121 addrconf_leave_anycast(ifp);
4122 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4123 dst_hold(&ifp->rt->dst);
93fa159a 4124
e9d3e084
HX		 4125 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4126 ip6_del_rt(ifp->rt))
d8d1f30b 4127 dst_free(&ifp->rt->dst);
1da177e4
LT		 4128 break;
4129 }
4130}
4131
4132static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4133{
8814c4b5 4134 rcu_read_lock_bh();
1da177e4
LT		 4135 if (likely(ifp->idev->dead == 0))
4136 __ipv6_ifa_notify(event, ifp);
8814c4b5 4137 rcu_read_unlock_bh();
1da177e4
LT		 4138}
4139
4140#ifdef CONFIG_SYSCTL
4141
4142static
8d65af78 4143int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4144 void __user *buffer, size_t *lenp, loff_t *ppos)
4145{
4146 int *valp = ctl->data;
4147 int val = *valp;
88af182e 4148 loff_t pos = *ppos;
1da177e4
LT		 4149 int ret;
4150
8d65af78 4151 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4152
c8fecf22 4153 if (write)
b325fddb 4154 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4155 if (ret)
4156 *ppos = pos;
1ab1457c 4157 return ret;
1da177e4
LT		 4158}
4159
56d417b1
BH		 4160static void dev_disable_change(struct inet6_dev *idev)
4161{
4162 if (!idev || !idev->dev)
4163 return;
4164
4165 if (idev->cnf.disable_ipv6)
4166 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4167 else
4168 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4169}
4170
4171static void addrconf_disable_change(struct net *net, __s32 newf)
4172{
4173 struct net_device *dev;
4174 struct inet6_dev *idev;
4175
c6d14c84
ED		 4176 rcu_read_lock();
4177 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4178 idev = __in6_dev_get(dev);
4179 if (idev) {
4180 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4181 idev->cnf.disable_ipv6 = newf;
4182 if (changed)
4183 dev_disable_change(idev);
4184 }
56d417b1 4185 }
c6d14c84 4186 rcu_read_unlock();
56d417b1
BH		 4187}
4188
4189static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4190{
4191 struct net *net;
4192
4193 net = (struct net *)table->extra2;
4194
4195 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4196 return 0;
4197
88af182e
EB		 4198 if (!rtnl_trylock()) {
4199 /* Restore the original values before restarting */
4200 *p = old;
56d417b1 4201 return restart_syscall();
88af182e 4202 }
56d417b1
BH		 4203
4204 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4205 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4206 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4207 addrconf_disable_change(net, newf);
4208 } else if ((!*p) ^ (!old))
4209 dev_disable_change((struct inet6_dev *)table->extra1);
4210
4211 rtnl_unlock();
4212 return 0;
4213}
4214
4215static
8d65af78 4216int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4217 void __user *buffer, size_t *lenp, loff_t *ppos)
4218{
4219 int *valp = ctl->data;
4220 int val = *valp;
88af182e 4221 loff_t pos = *ppos;
56d417b1
BH		 4222 int ret;
4223
8d65af78 4224 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4225
4226 if (write)
4227 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4228 if (ret)
4229 *ppos = pos;
56d417b1
BH		 4230 return ret;
4231}
4232
1da177e4
LT		 4233static struct addrconf_sysctl_table
4234{
4235 struct ctl_table_header *sysctl_header;
f6a07b29 4236 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4237 char *dev_name;
ab32ea5d 4238} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4239 .sysctl_header = NULL,
4240 .addrconf_vars = {
1ab1457c 4241 {
e21e8467
SH		 4242 .procname = "forwarding",
4243 .data = &ipv6_devconf.forwarding,
4244 .maxlen = sizeof(int),
4245 .mode = 0644,
4246 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4247 },
4248 {
e21e8467
SH		 4249 .procname = "hop_limit",
4250 .data = &ipv6_devconf.hop_limit,
4251 .maxlen = sizeof(int),
4252 .mode = 0644,
4253 .proc_handler = proc_dointvec,
1da177e4
LT		 4254 },
4255 {
e21e8467
SH		 4256 .procname = "mtu",
4257 .data = &ipv6_devconf.mtu6,
4258 .maxlen = sizeof(int),
4259 .mode = 0644,
4260 .proc_handler = proc_dointvec,
1da177e4
LT		 4261 },
4262 {
e21e8467
SH		 4263 .procname = "accept_ra",
4264 .data = &ipv6_devconf.accept_ra,
4265 .maxlen = sizeof(int),
4266 .mode = 0644,
4267 .proc_handler = proc_dointvec,
1da177e4
LT		 4268 },
4269 {
e21e8467
SH		 4270 .procname = "accept_redirects",
4271 .data = &ipv6_devconf.accept_redirects,
4272 .maxlen = sizeof(int),
4273 .mode = 0644,
4274 .proc_handler = proc_dointvec,
1da177e4
LT		 4275 },
4276 {
e21e8467
SH		 4277 .procname = "autoconf",
4278 .data = &ipv6_devconf.autoconf,
4279 .maxlen = sizeof(int),
4280 .mode = 0644,
4281 .proc_handler = proc_dointvec,
1da177e4
LT		 4282 },
4283 {
e21e8467
SH		 4284 .procname = "dad_transmits",
4285 .data = &ipv6_devconf.dad_transmits,
4286 .maxlen = sizeof(int),
4287 .mode = 0644,
4288 .proc_handler = proc_dointvec,
1da177e4
LT		 4289 },
4290 {
e21e8467
SH		 4291 .procname = "router_solicitations",
4292 .data = &ipv6_devconf.rtr_solicits,
4293 .maxlen = sizeof(int),
4294 .mode = 0644,
4295 .proc_handler = proc_dointvec,
1da177e4
LT		 4296 },
4297 {
e21e8467
SH		 4298 .procname = "router_solicitation_interval",
4299 .data = &ipv6_devconf.rtr_solicit_interval,
4300 .maxlen = sizeof(int),
4301 .mode = 0644,
4302 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4303 },
4304 {
e21e8467
SH		 4305 .procname = "router_solicitation_delay",
4306 .data = &ipv6_devconf.rtr_solicit_delay,
4307 .maxlen = sizeof(int),
4308 .mode = 0644,
4309 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4310 },
4311 {
e21e8467
SH		 4312 .procname = "force_mld_version",
4313 .data = &ipv6_devconf.force_mld_version,
4314 .maxlen = sizeof(int),
4315 .mode = 0644,
4316 .proc_handler = proc_dointvec,
1da177e4
LT		 4317 },
4318#ifdef CONFIG_IPV6_PRIVACY
4319 {
e21e8467
SH		 4320 .procname = "use_tempaddr",
4321 .data = &ipv6_devconf.use_tempaddr,
4322 .maxlen = sizeof(int),
4323 .mode = 0644,
4324 .proc_handler = proc_dointvec,
1da177e4
LT		 4325 },
4326 {
e21e8467
SH		 4327 .procname = "temp_valid_lft",
4328 .data = &ipv6_devconf.temp_valid_lft,
4329 .maxlen = sizeof(int),
4330 .mode = 0644,
4331 .proc_handler = proc_dointvec,
1da177e4
LT		 4332 },
4333 {
e21e8467
SH		 4334 .procname = "temp_prefered_lft",
4335 .data = &ipv6_devconf.temp_prefered_lft,
4336 .maxlen = sizeof(int),
4337 .mode = 0644,
4338 .proc_handler = proc_dointvec,
1da177e4
LT		 4339 },
4340 {
e21e8467
SH		 4341 .procname = "regen_max_retry",
4342 .data = &ipv6_devconf.regen_max_retry,
4343 .maxlen = sizeof(int),
4344 .mode = 0644,
4345 .proc_handler = proc_dointvec,
1da177e4
LT		 4346 },
4347 {
e21e8467
SH		 4348 .procname = "max_desync_factor",
4349 .data = &ipv6_devconf.max_desync_factor,
4350 .maxlen = sizeof(int),
4351 .mode = 0644,
4352 .proc_handler = proc_dointvec,
1da177e4
LT		 4353 },
4354#endif
4355 {
e21e8467
SH		 4356 .procname = "max_addresses",
4357 .data = &ipv6_devconf.max_addresses,
4358 .maxlen = sizeof(int),
4359 .mode = 0644,
4360 .proc_handler = proc_dointvec,
1da177e4 4361 },
65f5c7c1 4362 {
e21e8467
SH		 4363 .procname = "accept_ra_defrtr",
4364 .data = &ipv6_devconf.accept_ra_defrtr,
4365 .maxlen = sizeof(int),
4366 .mode = 0644,
4367 .proc_handler = proc_dointvec,
65f5c7c1 4368 },
c4fd30eb 4369 {
e21e8467
SH		 4370 .procname = "accept_ra_pinfo",
4371 .data = &ipv6_devconf.accept_ra_pinfo,
4372 .maxlen = sizeof(int),
4373 .mode = 0644,
4374 .proc_handler = proc_dointvec,
c4fd30eb 4375 },
930d6ff2
YH		 4376#ifdef CONFIG_IPV6_ROUTER_PREF
4377 {
e21e8467
SH		 4378 .procname = "accept_ra_rtr_pref",
4379 .data = &ipv6_devconf.accept_ra_rtr_pref,
4380 .maxlen = sizeof(int),
4381 .mode = 0644,
4382 .proc_handler = proc_dointvec,
930d6ff2 4383 },
52e16356 4384 {
e21e8467
SH		 4385 .procname = "router_probe_interval",
4386 .data = &ipv6_devconf.rtr_probe_interval,
4387 .maxlen = sizeof(int),
4388 .mode = 0644,
4389 .proc_handler = proc_dointvec_jiffies,
52e16356 4390 },
fa03ef38 4391#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4392 {
e21e8467
SH		 4393 .procname = "accept_ra_rt_info_max_plen",
4394 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
09c884d4
YH		 4398 },
4399#endif
930d6ff2 4400#endif
fbea49e1 4401 {
e21e8467
SH		 4402 .procname = "proxy_ndp",
4403 .data = &ipv6_devconf.proxy_ndp,
4404 .maxlen = sizeof(int),
4405 .mode = 0644,
4406 .proc_handler = proc_dointvec,
fbea49e1 4407 },
0bcbc926 4408 {
e21e8467
SH		 4409 .procname = "accept_source_route",
4410 .data = &ipv6_devconf.accept_source_route,
4411 .maxlen = sizeof(int),
4412 .mode = 0644,
4413 .proc_handler = proc_dointvec,
0bcbc926 4414 },
95c385b4
NH		 4415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4416 {
e21e8467
SH		 4417 .procname = "optimistic_dad",
4418 .data = &ipv6_devconf.optimistic_dad,
4419 .maxlen = sizeof(int),
4420 .mode = 0644,
4421 .proc_handler = proc_dointvec,
95c385b4
NH		 4422
4423 },
7bc570c8
YH		 4424#endif
4425#ifdef CONFIG_IPV6_MROUTE
4426 {
e21e8467
SH		 4427 .procname = "mc_forwarding",
4428 .data = &ipv6_devconf.mc_forwarding,
4429 .maxlen = sizeof(int),
4430 .mode = 0444,
4431 .proc_handler = proc_dointvec,
7bc570c8 4432 },
95c385b4 4433#endif
778d80be 4434 {
e21e8467
SH		 4435 .procname = "disable_ipv6",
4436 .data = &ipv6_devconf.disable_ipv6,
4437 .maxlen = sizeof(int),
4438 .mode = 0644,
4439 .proc_handler = addrconf_sysctl_disable,
778d80be 4440 },
1b34be74 4441 {
e21e8467
SH		 4442 .procname = "accept_dad",
4443 .data = &ipv6_devconf.accept_dad,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec,
1b34be74 4447 },
f7734fdf 4448 {
f7734fdf
OP		 4449 .procname = "force_tllao",
4450 .data = &ipv6_devconf.force_tllao,
4451 .maxlen = sizeof(int),
4452 .mode = 0644,
4453 .proc_handler = proc_dointvec
4454 },
1da177e4 4455 {
f8572d8f 4456 /* sentinel */
1da177e4
LT		 4457 }
4458 },
1da177e4
LT		 4459};
4460
bff16c2f 4461static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4462 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4463{
4464 int i;
1da177e4 4465 struct addrconf_sysctl_table *t;
1da177e4 4466
1dab6222
PE		 4467#define ADDRCONF_CTL_PATH_DEV 3
4468
4469 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4470 { .procname = "net", },
4471 { .procname = "ipv6", },
4472 { .procname = "conf", },
1dab6222
PE		 4473 { /* to be set */ },
4474 { },
4475 };
4476
4477
af879cc7 4478 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4479 if (t == NULL)
f68635e6
PE		 4480 goto out;
4481
bcdd553f 4482 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4483 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4484 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4485 t->addrconf_vars[i].extra2 = net;
1da177e4 4486 }
1da177e4 4487
1ab1457c
YH		 4488 /*
4489 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4490 * by sysctl and we wouldn't want anyone to change it under our feet
4491 * (see SIOCSIFNAME).
1ab1457c 4492 */
1dab6222
PE		 4493 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4494 if (!t->dev_name)
f68635e6 4495 goto free;
1da177e4 4496
1dab6222 4497 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4498
bff16c2f 4499 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4500 t->addrconf_vars);
1da177e4
LT		 4501 if (t->sysctl_header == NULL)
4502 goto free_procname;
f68635e6
PE		 4503
4504 p->sysctl = t;
95897312 4505 return 0;
1da177e4 4506
f68635e6 4507free_procname:
1dab6222 4508 kfree(t->dev_name);
f68635e6 4509free:
1da177e4 4510 kfree(t);
f68635e6 4511out:
95897312 4512 return -ENOBUFS;
1da177e4
LT		 4513}
4514
408c4768
PE		 4515static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4516{
4517 struct addrconf_sysctl_table *t;
4518
4519 if (p->sysctl == NULL)
4520 return;
4521
4522 t = p->sysctl;
4523 p->sysctl = NULL;
4524 unregister_sysctl_table(t->sysctl_header);
4525 kfree(t->dev_name);
4526 kfree(t);
4527}
4528
f52295a9
PE		 4529static void addrconf_sysctl_register(struct inet6_dev *idev)
4530{
54716e3b 4531 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4532 &ndisc_ifinfo_sysctl_change);
c346dca1 4533 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4534 idev, &idev->cnf);
f52295a9
PE		 4535}
4536
408c4768 4537static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4538{
408c4768
PE		 4539 __addrconf_sysctl_unregister(&idev->cnf);
4540 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4541}
4542
4543
4544#endif
4545
2c8c1e72 4546static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4547{
4548 int err;
4549 struct ipv6_devconf *all, *dflt;
4550
4551 err = -ENOMEM;
4552 all = &ipv6_devconf;
4553 dflt = &ipv6_devconf_dflt;
4554
09ad9bc7 4555 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4556 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4557 if (all == NULL)
4558 goto err_alloc_all;
4559
4560 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4561 if (dflt == NULL)
4562 goto err_alloc_dflt;
56d417b1
BH		 4563 } else {
4564 /* these will be inherited by all namespaces */
4565 dflt->autoconf = ipv6_defaults.autoconf;
4566 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4567 }
4568
4569 net->ipv6.devconf_all = all;
4570 net->ipv6.devconf_dflt = dflt;
4571
4572#ifdef CONFIG_SYSCTL
f8572d8f 4573 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4574 if (err < 0)
4575 goto err_reg_all;
4576
f8572d8f 4577 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4578 if (err < 0)
4579 goto err_reg_dflt;
4580#endif
4581 return 0;
4582
4583#ifdef CONFIG_SYSCTL
4584err_reg_dflt:
4585 __addrconf_sysctl_unregister(all);
4586err_reg_all:
4587 kfree(dflt);
4588#endif
4589err_alloc_dflt:
4590 kfree(all);
4591err_alloc_all:
4592 return err;
4593}
4594
2c8c1e72 4595static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4596{
4597#ifdef CONFIG_SYSCTL
4598 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4599 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4600#endif
09ad9bc7 4601 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4602 kfree(net->ipv6.devconf_dflt);
4603 kfree(net->ipv6.devconf_all);
4604 }
4605}
4606
4607static struct pernet_operations addrconf_ops = {
4608 .init = addrconf_init_net,
4609 .exit = addrconf_exit_net,
4610};
4611
1da177e4
LT		 4612/*
4613 * Device notifier
4614 */
4615
4616int register_inet6addr_notifier(struct notifier_block *nb)
4617{
1ab1457c 4618 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4619}
7159039a
YH		 4620EXPORT_SYMBOL(register_inet6addr_notifier);
4621
1da177e4
LT		 4622int unregister_inet6addr_notifier(struct notifier_block *nb)
4623{
e21e8467 4624 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4625}
7159039a
YH		 4626EXPORT_SYMBOL(unregister_inet6addr_notifier);
4627
1da177e4
LT		 4628/*
4629 * Init / cleanup code
4630 */
4631
4632int __init addrconf_init(void)
4633{
c2e21293 4634 int i, err;
2a8cc6c8 4635
e21e8467
SH		 4636 err = ipv6_addr_label_init();
4637 if (err < 0) {
4638 printk(KERN_CRIT "IPv6 Addrconf:"
4639 " cannot initialize default policy table: %d.\n", err);
2cc6d2bf 4640 goto out;
2a8cc6c8 4641 }
1da177e4 4642
2cc6d2bf
NH		 4643 err = register_pernet_subsys(&addrconf_ops);
4644 if (err < 0)
4645 goto out_addrlabel;
e0da5a48 4646
1da177e4
LT		 4647 /* The addrconf netdev notifier requires that loopback_dev
4648 * has it's ipv6 private information allocated and setup
4649 * before it can bring up and give link-local addresses
4650 * to other devices which are up.
4651 *
4652 * Unfortunately, loopback_dev is not necessarily the first
4653 * entry in the global dev_base list of net devices. In fact,
4654 * it is likely to be the very last entry on that list.
4655 * So this causes the notifier registry below to try and
4656 * give link-local addresses to all devices besides loopback_dev
4657 * first, then loopback_dev, which cases all the non-loopback_dev
4658 * devices to fail to get a link-local address.
4659 *
4660 * So, as a temporary fix, allocate the ipv6 structure for
4661 * loopback_dev first by hand.
4662 * Longer term, all of the dependencies ipv6 has upon the loopback
4663 * device and it being up should be removed.
4664 */
4665 rtnl_lock();
2774c7ab 4666 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4667 err = -ENOMEM;
4668 rtnl_unlock();
4669 if (err)
e0da5a48 4670 goto errlo;
1da177e4 4671
c2e21293 4672 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4673 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4674
1da177e4
LT		 4675 register_netdevice_notifier(&ipv6_dev_notf);
4676
1da177e4 4677 addrconf_verify(0);
c127ea2c
TG		 4678
4679 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4680 if (err < 0)
4681 goto errout;
4682
4683 /* Only the first call to __rtnl_register can fail */
4684 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4685 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4686 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4687 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4688 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4689
2a8cc6c8
YH		 4690 ipv6_addr_label_rtnl_register();
4691
1da177e4 4692 return 0;
c127ea2c
TG		 4693errout:
4694 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4695errlo:
4696 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4697out_addrlabel:
4698 ipv6_addr_label_cleanup();
4699out:
c127ea2c 4700 return err;
1da177e4
LT		 4701}
4702
09f7709f 4703void addrconf_cleanup(void)
1da177e4 4704{
176c39af 4705 struct net_device *dev;
1da177e4
LT		 4706 int i;
4707
4708 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4709 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4710 ipv6_addr_label_cleanup();
1da177e4
LT		 4711
4712 rtnl_lock();
4713
176c39af
DL		 4714 /* clean dev list */
4715 for_each_netdev(&init_net, dev) {
4716 if (__in6_dev_get(dev) == NULL)
4717 continue;
4718 addrconf_ifdown(dev, 1);
4719 }
4720 addrconf_ifdown(init_net.loopback_dev, 2);
4721
1da177e4
LT		 4722 /*
4723 * Check hash table.
4724 */
5c578aed 4725 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4726 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4727 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4728 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4729
4730 del_timer(&addr_chk_timer);
1da177e4 4731 rtnl_unlock();
1da177e4 4732}
Clone of davem's net-next-2.6 tree