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net: delete all instances of special processing for token ring
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
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
06a4c1c5 69#include <net/af_ieee802154.h>
1da177e4
LT		 70#include <net/ipv6.h>
71#include <net/protocol.h>
72#include <net/ndisc.h>
73#include <net/ip6_route.h>
74#include <net/addrconf.h>
75#include <net/tcp.h>
76#include <net/ip.h>
5d620266 77#include <net/netlink.h>
f24e3d65 78#include <net/pkt_sched.h>
1da177e4
LT		 79#include <linux/if_tunnel.h>
80#include <linux/rtnetlink.h>
81
82#ifdef CONFIG_IPV6_PRIVACY
83#include <linux/random.h>
1da177e4
LT		 84#endif
85
e21e8467 86#include <linux/uaccess.h>
7f7d9a6b 87#include <asm/unaligned.h>
1da177e4
LT		 88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
bc3b2d7f 91#include <linux/export.h>
1da177e4
LT		 92
93/* Set to 3 to get tracing... */
94#define ACONF_DEBUG 2
95
96#if ACONF_DEBUG >= 3
97#define ADBG(x) printk x
98#else
99#define ADBG(x)
100#endif
101
102#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 103
104static inline u32 cstamp_delta(unsigned long cstamp)
105{
106 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
107}
1da177e4 108
b2db7564
YH		 109#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
110#define ADDRCONF_TIMER_FUZZ (HZ / 4)
111#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
112
1da177e4 113#ifdef CONFIG_SYSCTL
f52295a9 114static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 115static void addrconf_sysctl_unregister(struct inet6_dev *idev);
116#else
117static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118{
119}
120
121static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
122{
123}
1da177e4
LT		 124#endif
125
126#ifdef CONFIG_IPV6_PRIVACY
127static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 128static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 129static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 130#endif
131
1b34be74 132static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 133static int ipv6_count_addresses(struct inet6_dev *idev);
134
135/*
136 * Configured unicast address hash table
137 */
c2e21293 138static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 139static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 140
1da177e4
LT		 141static void addrconf_verify(unsigned long);
142
8d06afab 143static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 144static DEFINE_SPINLOCK(addrconf_verify_lock);
145
146static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
147static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
148
93d9b7d7
JP		 149static void addrconf_type_change(struct net_device *dev,
150 unsigned long event);
1da177e4
LT		 151static int addrconf_ifdown(struct net_device *dev, int how);
152
cf22f9a2 153static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 154static void addrconf_dad_timer(unsigned long data);
155static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 156static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 157static void addrconf_rs_timer(unsigned long data);
158static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160
1ab1457c 161static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 162 struct prefix_info *pinfo);
3e81c6da
DM		 163static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
1da177e4 165
e041c683 166static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 167
888c848e 168static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 169 .forwarding = 0,
170 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
171 .mtu6 = IPV6_MIN_MTU,
172 .accept_ra = 1,
173 .accept_redirects = 1,
174 .autoconf = 1,
175 .force_mld_version = 0,
176 .dad_transmits = 1,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
180#ifdef CONFIG_IPV6_PRIVACY
181 .use_tempaddr = 0,
182 .temp_valid_lft = TEMP_VALID_LIFETIME,
183 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
184 .regen_max_retry = REGEN_MAX_RETRY,
185 .max_desync_factor = MAX_DESYNC_FACTOR,
186#endif
187 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 188 .accept_ra_defrtr = 1,
c4fd30eb 189 .accept_ra_pinfo = 1,
930d6ff2
YH		 190#ifdef CONFIG_IPV6_ROUTER_PREF
191 .accept_ra_rtr_pref = 1,
52e16356 192 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 193#ifdef CONFIG_IPV6_ROUTE_INFO
194 .accept_ra_rt_info_max_plen = 0,
195#endif
930d6ff2 196#endif
fbea49e1 197 .proxy_ndp = 0,
0bcbc926 198 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 199 .disable_ipv6 = 0,
1b34be74 200 .accept_dad = 1,
1da177e4
LT		 201};
202
ab32ea5d 203static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 204 .forwarding = 0,
205 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
206 .mtu6 = IPV6_MIN_MTU,
207 .accept_ra = 1,
208 .accept_redirects = 1,
209 .autoconf = 1,
210 .dad_transmits = 1,
211 .rtr_solicits = MAX_RTR_SOLICITATIONS,
212 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
213 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
214#ifdef CONFIG_IPV6_PRIVACY
215 .use_tempaddr = 0,
216 .temp_valid_lft = TEMP_VALID_LIFETIME,
217 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
218 .regen_max_retry = REGEN_MAX_RETRY,
219 .max_desync_factor = MAX_DESYNC_FACTOR,
220#endif
221 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 222 .accept_ra_defrtr = 1,
c4fd30eb 223 .accept_ra_pinfo = 1,
930d6ff2
YH		 224#ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
52e16356 226 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 227#ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
229#endif
930d6ff2 230#endif
fbea49e1 231 .proxy_ndp = 0,
0bcbc926 232 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 233 .disable_ipv6 = 0,
1b34be74 234 .accept_dad = 1,
1da177e4
LT		 235};
236
237/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 238const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 239const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 240const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
241const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 242
f24e3d65 243/* Check if a valid qdisc is available */
05297949 244static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 245{
05297949 246 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 247}
248
2b5ead46
YH		 249/* Check if a route is valid prefix route */
250static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
251{
a02cec21 252 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 253}
254
1da177e4
LT		 255static void addrconf_del_timer(struct inet6_ifaddr *ifp)
256{
257 if (del_timer(&ifp->timer))
258 __in6_ifa_put(ifp);
259}
260
e21e8467 261enum addrconf_timer_t {
1da177e4
LT		 262 AC_NONE,
263 AC_DAD,
264 AC_RS,
265};
266
267static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
268 enum addrconf_timer_t what,
269 unsigned long when)
270{
271 if (!del_timer(&ifp->timer))
272 in6_ifa_hold(ifp);
273
274 switch (what) {
275 case AC_DAD:
276 ifp->timer.function = addrconf_dad_timer;
277 break;
278 case AC_RS:
279 ifp->timer.function = addrconf_rs_timer;
280 break;
e21e8467
SH		 281 default:
282 break;
1da177e4
LT		 283 }
284 ifp->timer.expires = jiffies + when;
285 add_timer(&ifp->timer);
286}
287
7f7d9a6b
HX		 288static int snmp6_alloc_dev(struct inet6_dev *idev)
289{
7d720c3e 290 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 291 sizeof(struct ipstats_mib),
292 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 293 goto err_ip;
be281e55
ED		 294 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6dev)
7f7d9a6b 297 goto err_icmp;
be281e55
ED		 298 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6msgdev)
14878f75 301 goto err_icmpmsg;
7f7d9a6b
HX		 302
303 return 0;
304
14878f75 305err_icmpmsg:
be281e55 306 kfree(idev->stats.icmpv6dev);
7f7d9a6b 307err_icmp:
7d720c3e 308 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 309err_ip:
aaf70ec7 310 return -ENOMEM;
7f7d9a6b
HX		 311}
312
16910b98 313static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 314{
be281e55
ED		 315 kfree(idev->stats.icmpv6msgdev);
316 kfree(idev->stats.icmpv6dev);
7d720c3e 317 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 318}
319
1da177e4
LT		 320/* Nobody refers to this device, we may destroy it. */
321
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);
38f57d1a 338 kfree_rcu(idev, rcu);
1da177e4 339}
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
8e5e8f30 342static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 378 dev_put(dev);
379 kfree(ndev);
322f74a4
IO		 380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
b077d7ab
YH		 401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
1da177e4
LT		 423#endif
424
f24e3d65 425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 426 ndev->if_flags |= IF_READY;
427
322f74a4
IO		 428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
f52295a9 430 addrconf_sysctl_register(ndev);
30c4cf57 431 /* protected by rtnl_lock */
cf778b00 432 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 433
434 /* Join all-node multicast group */
f3ee4010 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 436
d6ddef9e 437 /* Join all-router multicast group if forwarding is set */
8b2aaede 438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
1da177e4
LT		 441 return ndev;
442}
443
8e5e8f30 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
013d97e9 509static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 510{
bff16c2f 511 struct net *net;
013d97e9
FR		 512 int old;
513
514 if (!rtnl_trylock())
515 return restart_syscall();
bff16c2f
PE		 516
517 net = (struct net *)table->extra2;
013d97e9
FR		 518 old = *p;
519 *p = newf;
b325fddb 520
013d97e9
FR		 521 if (p == &net->ipv6.devconf_dflt->forwarding) {
522 rtnl_unlock();
523 return 0;
88af182e 524 }
c8fecf22 525
e186932b 526 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 527 net->ipv6.devconf_dflt->forwarding = newf;
528 addrconf_forward_change(net, newf);
013d97e9 529 } else if ((!newf) ^ (!old))
c8fecf22 530 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 531 rtnl_unlock();
c8fecf22 532
013d97e9 533 if (newf)
7b4da532 534 rt6_purge_dflt_routers(net);
b325fddb 535 return 1;
c8fecf22 536}
1da177e4
LT		 537#endif
538
5c578aed 539/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 540void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
541{
c2e21293 542 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 543
1da177e4
LT		 544#ifdef NET_REFCNT_DEBUG
545 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
546#endif
547
548 in6_dev_put(ifp->idev);
549
550 if (del_timer(&ifp->timer))
e21e8467 551 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 552
e9d3e084 553 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 554 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 555 return;
556 }
d8d1f30b 557 dst_release(&ifp->rt->dst);
1da177e4 558
e5785985 559 kfree_rcu(ifp, rcu);
1da177e4
LT		 560}
561
e55ffac6
BH		 562static void
563ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
564{
502a2ffd 565 struct list_head *p;
8a6ce0c0 566 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 567
568 /*
569 * Each device address list is sorted in order of scope -
570 * global before linklocal.
571 */
502a2ffd 572 list_for_each(p, &idev->addr_list) {
573 struct inet6_ifaddr *ifa
574 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 575 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 576 break;
577 }
578
b54c9b98 579 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 580}
581
3a88a81d 582static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 583{
3eb84f49
YH		 584 /*
585 * We perform the hash function over the last 64 bits of the address
586 * This will include the IEEE address token on links that support it.
587 */
0eae88f3
ED		 588 return jhash_2words((__force u32)addr->s6_addr32[2],
589 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 590 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 591}
592
1da177e4
LT		 593/* On success it returns ifp with increased reference count */
594
595static struct inet6_ifaddr *
596ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 597 int scope, u32 flags)
1da177e4
LT		 598{
599 struct inet6_ifaddr *ifa = NULL;
600 struct rt6_info *rt;
3a88a81d 601 unsigned int hash;
1da177e4 602 int err = 0;
d68b8270
YH		 603 int addr_type = ipv6_addr_type(addr);
604
605 if (addr_type == IPV6_ADDR_ANY ||
606 addr_type & IPV6_ADDR_MULTICAST ||
607 (!(idev->dev->flags & IFF_LOOPBACK) &&
608 addr_type & IPV6_ADDR_LOOPBACK))
609 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 610
8814c4b5 611 rcu_read_lock_bh();
1da177e4
LT		 612 if (idev->dead) {
613 err = -ENODEV; /*XXX*/
614 goto out2;
615 }
616
56d417b1 617 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 618 err = -EACCES;
619 goto out2;
620 }
621
5c578aed 622 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 623
624 /* Ignore adding duplicate addresses on an interface */
c346dca1 625 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 626 ADBG(("ipv6_add_addr: already assigned\n"));
627 err = -EEXIST;
628 goto out;
629 }
630
322f74a4 631 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 632
633 if (ifa == NULL) {
634 ADBG(("ipv6_add_addr: malloc failed\n"));
635 err = -ENOBUFS;
636 goto out;
637 }
638
8f031519 639 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 640 if (IS_ERR(rt)) {
641 err = PTR_ERR(rt);
642 goto out;
643 }
644
4e3fd7a0 645 ifa->addr = *addr;
1da177e4
LT		 646
647 spin_lock_init(&ifa->lock);
e9d3e084 648 spin_lock_init(&ifa->state_lock);
1da177e4 649 init_timer(&ifa->timer);
c2e21293 650 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 651 ifa->timer.data = (unsigned long) ifa;
652 ifa->scope = scope;
653 ifa->prefix_len = pfxlen;
654 ifa->flags = flags | IFA_F_TENTATIVE;
655 ifa->cstamp = ifa->tstamp = jiffies;
656
57f5f544
KF		 657 ifa->rt = rt;
658
1da177e4
LT		 659 ifa->idev = idev;
660 in6_dev_hold(idev);
661 /* For caller */
662 in6_ifa_hold(ifa);
663
664 /* Add to big hash table */
665 hash = ipv6_addr_hash(addr);
666
5c578aed 667 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 668 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 669
670 write_lock(&idev->lock);
671 /* Add to inet6_dev unicast addr list. */
e55ffac6 672 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 673
674#ifdef CONFIG_IPV6_PRIVACY
675 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 676 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 677 in6_ifa_hold(ifa);
678 }
679#endif
680
1da177e4
LT		 681 in6_ifa_hold(ifa);
682 write_unlock(&idev->lock);
683out2:
8814c4b5 684 rcu_read_unlock_bh();
1da177e4 685
fd92833a 686 if (likely(err == 0))
e041c683 687 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 688 else {
689 kfree(ifa);
690 ifa = ERR_PTR(err);
691 }
692
693 return ifa;
694out:
5c578aed 695 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 696 goto out2;
697}
698
699/* This function wants to get referenced ifp and releases it before return */
700
701static void ipv6_del_addr(struct inet6_ifaddr *ifp)
702{
502a2ffd 703 struct inet6_ifaddr *ifa, *ifn;
1da177e4 704 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 705 int state;
1da177e4
LT		 706 int deleted = 0, onlink = 0;
707 unsigned long expires = jiffies;
708
4c5ff6a6
HX		 709 spin_lock_bh(&ifp->state_lock);
710 state = ifp->state;
e9d3e084 711 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 712 spin_unlock_bh(&ifp->state_lock);
713
714 if (state == INET6_IFADDR_STATE_DEAD)
715 goto out;
1da177e4 716
5c578aed 717 spin_lock_bh(&addrconf_hash_lock);
718 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 719 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 720
721 write_lock_bh(&idev->lock);
722#ifdef CONFIG_IPV6_PRIVACY
723 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 724 list_del(&ifp->tmp_list);
725 if (ifp->ifpub) {
726 in6_ifa_put(ifp->ifpub);
727 ifp->ifpub = NULL;
1da177e4 728 }
372e6c8f 729 __in6_ifa_put(ifp);
1da177e4
LT		 730 }
731#endif
732
502a2ffd 733 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 734 if (ifa == ifp) {
502a2ffd 735 list_del_init(&ifp->if_list);
1da177e4 736 __in6_ifa_put(ifp);
502a2ffd 737
1da177e4
LT		 738 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
739 break;
740 deleted = 1;
1d142804 741 continue;
1da177e4
LT		 742 } else if (ifp->flags & IFA_F_PERMANENT) {
743 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
744 ifp->prefix_len)) {
745 if (ifa->flags & IFA_F_PERMANENT) {
746 onlink = 1;
747 if (deleted)
748 break;
749 } else {
750 unsigned long lifetime;
751
752 if (!onlink)
753 onlink = -1;
754
755 spin_lock(&ifa->lock);
4bed72e4
YH		 756
757 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
758 /*
759 * Note: Because this address is
760 * not permanent, lifetime <
761 * LONG_MAX / HZ here.
762 */
1da177e4
LT		 763 if (time_before(expires,
764 ifa->tstamp + lifetime * HZ))
765 expires = ifa->tstamp + lifetime * HZ;
766 spin_unlock(&ifa->lock);
767 }
768 }
769 }
770 }
771 write_unlock_bh(&idev->lock);
772
b2238566
AV		 773 addrconf_del_timer(ifp);
774
1da177e4
LT		 775 ipv6_ifa_notify(RTM_DELADDR, ifp);
776
e041c683 777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 778
1da177e4
LT		 779 /*
780 * Purge or update corresponding prefix
781 *
782 * 1) we don't purge prefix here if address was not permanent.
783 * prefix is managed by its own lifetime.
784 * 2) if there're no addresses, delete prefix.
785 * 3) if there're still other permanent address(es),
786 * corresponding prefix is still permanent.
787 * 4) otherwise, update prefix lifetime to the
788 * longest valid lifetime among the corresponding
789 * addresses on the device.
790 * Note: subsequent RA will update lifetime.
791 *
792 * --yoshfuji
793 */
794 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
795 struct in6_addr prefix;
796 struct rt6_info *rt;
c346dca1 797 struct net *net = dev_net(ifp->idev->dev);
1da177e4 798 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 799 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 800
2b5ead46 801 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 802 if (onlink == 0) {
e0a1ad73 803 ip6_del_rt(rt);
1da177e4
LT		 804 rt = NULL;
805 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 806 rt6_set_expires(rt, expires);
1da177e4
LT		 807 }
808 }
d8d1f30b 809 dst_release(&rt->dst);
1da177e4
LT		 810 }
811
c3968a85
DW		 812 /* clean up prefsrc entries */
813 rt6_remove_prefsrc(ifp);
4c5ff6a6 814out:
1da177e4
LT		 815 in6_ifa_put(ifp);
816}
817
818#ifdef CONFIG_IPV6_PRIVACY
819static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
820{
821 struct inet6_dev *idev = ifp->idev;
822 struct in6_addr addr, *tmpaddr;
76f793e3 823 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 824 unsigned long regen_advance;
1da177e4
LT		 825 int tmp_plen;
826 int ret = 0;
827 int max_addresses;
95c385b4 828 u32 addr_flags;
76f793e3 829 unsigned long now = jiffies;
1da177e4
LT		 830
831 write_lock(&idev->lock);
832 if (ift) {
833 spin_lock_bh(&ift->lock);
834 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
835 spin_unlock_bh(&ift->lock);
836 tmpaddr = &addr;
837 } else {
838 tmpaddr = NULL;
839 }
840retry:
841 in6_dev_hold(idev);
842 if (idev->cnf.use_tempaddr <= 0) {
843 write_unlock(&idev->lock);
844 printk(KERN_INFO
845 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
846 in6_dev_put(idev);
847 ret = -1;
848 goto out;
849 }
850 spin_lock_bh(&ifp->lock);
851 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
852 idev->cnf.use_tempaddr = -1; /*XXX*/
853 spin_unlock_bh(&ifp->lock);
854 write_unlock(&idev->lock);
855 printk(KERN_WARNING
856 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
857 in6_dev_put(idev);
858 ret = -1;
859 goto out;
860 }
861 in6_ifa_hold(ifp);
862 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
863 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
864 spin_unlock_bh(&ifp->lock);
865 write_unlock(&idev->lock);
866 printk(KERN_WARNING
867 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
868 in6_ifa_put(ifp);
869 in6_dev_put(idev);
870 ret = -1;
871 goto out;
872 }
873 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 874 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 875 tmp_valid_lft = min_t(__u32,
876 ifp->valid_lft,
7a876b0e 877 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 878 tmp_prefered_lft = min_t(__u32,
879 ifp->prefered_lft,
7a876b0e 880 idev->cnf.temp_prefered_lft + age -
784e2710 881 idev->cnf.max_desync_factor);
1da177e4
LT		 882 tmp_plen = ifp->prefix_len;
883 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 884 tmp_tstamp = ifp->tstamp;
885 spin_unlock_bh(&ifp->lock);
886
eac55bf9
BB		 887 regen_advance = idev->cnf.regen_max_retry *
888 idev->cnf.dad_transmits *
889 idev->nd_parms->retrans_time / HZ;
1da177e4 890 write_unlock(&idev->lock);
95c385b4 891
eac55bf9
BB		 892 /* A temporary address is created only if this calculated Preferred
893 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
894 * an implementation must not create a temporary address with a zero
895 * Preferred Lifetime.
896 */
897 if (tmp_prefered_lft <= regen_advance) {
898 in6_ifa_put(ifp);
899 in6_dev_put(idev);
900 ret = -1;
901 goto out;
902 }
903
95c385b4
NH		 904 addr_flags = IFA_F_TEMPORARY;
905 /* set in addrconf_prefix_rcv() */
906 if (ifp->flags & IFA_F_OPTIMISTIC)
907 addr_flags |= IFA_F_OPTIMISTIC;
908
1da177e4 909 ift = !max_addresses ||
1ab1457c 910 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 911 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
913 addr_flags) : NULL;
1da177e4
LT		 914 if (!ift || IS_ERR(ift)) {
915 in6_ifa_put(ifp);
916 in6_dev_put(idev);
917 printk(KERN_INFO
918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
919 tmpaddr = &addr;
920 write_lock(&idev->lock);
921 goto retry;
922 }
923
924 spin_lock_bh(&ift->lock);
925 ift->ifpub = ifp;
926 ift->valid_lft = tmp_valid_lft;
927 ift->prefered_lft = tmp_prefered_lft;
76f793e3 928 ift->cstamp = now;
1da177e4
LT		 929 ift->tstamp = tmp_tstamp;
930 spin_unlock_bh(&ift->lock);
931
cf22f9a2 932 addrconf_dad_start(ift);
1da177e4
LT		 933 in6_ifa_put(ift);
934 in6_dev_put(idev);
935out:
936 return ret;
937}
938#endif
939
940/*
072047e4 941 * Choose an appropriate source address (RFC3484)
1da177e4 942 */
a9b05723
YH		 943enum {
944 IPV6_SADDR_RULE_INIT = 0,
945 IPV6_SADDR_RULE_LOCAL,
946 IPV6_SADDR_RULE_SCOPE,
947 IPV6_SADDR_RULE_PREFERRED,
948#ifdef CONFIG_IPV6_MIP6
949 IPV6_SADDR_RULE_HOA,
950#endif
951 IPV6_SADDR_RULE_OIF,
952 IPV6_SADDR_RULE_LABEL,
953#ifdef CONFIG_IPV6_PRIVACY
954 IPV6_SADDR_RULE_PRIVACY,
955#endif
956 IPV6_SADDR_RULE_ORCHID,
957 IPV6_SADDR_RULE_PREFIX,
958 IPV6_SADDR_RULE_MAX
959};
960
072047e4 961struct ipv6_saddr_score {
a9b05723
YH		 962 int rule;
963 int addr_type;
964 struct inet6_ifaddr *ifa;
965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
966 int scopedist;
967 int matchlen;
072047e4
YH		 968};
969
a9b05723 970struct ipv6_saddr_dst {
9acd9f3a 971 const struct in6_addr *addr;
a9b05723
YH		 972 int ifindex;
973 int scope;
974 int label;
7cbca67c 975 unsigned int prefs;
a9b05723 976};
072047e4 977
b6f99a21 978static inline int ipv6_saddr_preferred(int type)
1da177e4 979{
45bb0060 980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 981 return 1;
982 return 0;
1da177e4
LT		 983}
984
3de23255
BT		 985static int ipv6_get_saddr_eval(struct net *net,
986 struct ipv6_saddr_score *score,
a9b05723
YH		 987 struct ipv6_saddr_dst *dst,
988 int i)
989{
990 int ret;
991
992 if (i <= score->rule) {
993 switch (i) {
994 case IPV6_SADDR_RULE_SCOPE:
995 ret = score->scopedist;
996 break;
997 case IPV6_SADDR_RULE_PREFIX:
998 ret = score->matchlen;
999 break;
1000 default:
1001 ret = !!test_bit(i, score->scorebits);
1002 }
1003 goto out;
1004 }
1005
1006 switch (i) {
1007 case IPV6_SADDR_RULE_INIT:
1008 /* Rule 0: remember if hiscore is not ready yet */
1009 ret = !!score->ifa;
1010 break;
1011 case IPV6_SADDR_RULE_LOCAL:
1012 /* Rule 1: Prefer same address */
1013 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1014 break;
1015 case IPV6_SADDR_RULE_SCOPE:
1016 /* Rule 2: Prefer appropriate scope
1017 *
1018 * ret
1019 * ^
1020 * -1 | d 15
1021 * ---+--+-+---> scope
1022 * |
1023 * | d is scope of the destination.
1024 * B-d | \
1025 * | \ <- smaller scope is better if
1026 * B-15 | \ if scope is enough for destinaion.
1027 * | ret = B - scope (-1 <= scope >= d <= 15).
1028 * d-C-1 | /
1029 * |/ <- greater is better
1030 * -C / if scope is not enough for destination.
1031 * /| ret = scope - C (-1 <= d < scope <= 15).
1032 *
1033 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1034 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1035 * Assume B = 0 and we get C > 29.
1036 */
1037 ret = __ipv6_addr_src_scope(score->addr_type);
1038 if (ret >= dst->scope)
1039 ret = -ret;
1040 else
1041 ret -= 128; /* 30 is enough */
1042 score->scopedist = ret;
1043 break;
1044 case IPV6_SADDR_RULE_PREFERRED:
1045 /* Rule 3: Avoid deprecated and optimistic addresses */
1046 ret = ipv6_saddr_preferred(score->addr_type) ||
1047 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1048 break;
1049#ifdef CONFIG_IPV6_MIP6
1050 case IPV6_SADDR_RULE_HOA:
7cbca67c 1051 {
a9b05723 1052 /* Rule 4: Prefer home address */
7cbca67c
YH		 1053 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1054 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1055 break;
7cbca67c 1056 }
a9b05723
YH		 1057#endif
1058 case IPV6_SADDR_RULE_OIF:
1059 /* Rule 5: Prefer outgoing interface */
1060 ret = (!dst->ifindex ||
1061 dst->ifindex == score->ifa->idev->dev->ifindex);
1062 break;
1063 case IPV6_SADDR_RULE_LABEL:
1064 /* Rule 6: Prefer matching label */
3de23255
BT		 1065 ret = ipv6_addr_label(net,
1066 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1067 score->ifa->idev->dev->ifindex) == dst->label;
1068 break;
1069#ifdef CONFIG_IPV6_PRIVACY
1070 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1071 {
a9b05723 1072 /* Rule 7: Prefer public address
25985edc 1073 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1074 */
7cbca67c
YH		 1075 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1076 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1077 score->ifa->idev->cnf.use_tempaddr >= 2;
1078 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1079 break;
7cbca67c 1080 }
a9b05723
YH		 1081#endif
1082 case IPV6_SADDR_RULE_ORCHID:
1083 /* Rule 8-: Prefer ORCHID vs ORCHID or
1084 * non-ORCHID vs non-ORCHID
1085 */
1086 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1087 ipv6_addr_orchid(dst->addr));
1088 break;
1089 case IPV6_SADDR_RULE_PREFIX:
1090 /* Rule 8: Use longest matching prefix */
1091 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1092 dst->addr);
1093 break;
1094 default:
1095 ret = 0;
1096 }
1097
1098 if (ret)
1099 __set_bit(i, score->scorebits);
1100 score->rule = i;
1101out:
1102 return ret;
1103}
1104
191cd582 1105int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1106 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1107 struct in6_addr *saddr)
1da177e4 1108{
a9b05723
YH		 1109 struct ipv6_saddr_score scores[2],
1110 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1111 struct ipv6_saddr_dst dst;
072047e4 1112 struct net_device *dev;
a9b05723 1113 int dst_type;
1da177e4 1114
a9b05723
YH		 1115 dst_type = __ipv6_addr_type(daddr);
1116 dst.addr = daddr;
1117 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1118 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1119 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1120 dst.prefs = prefs;
a9b05723
YH		 1121
1122 hiscore->rule = -1;
1123 hiscore->ifa = NULL;
1da177e4 1124
8814c4b5 1125 rcu_read_lock();
1da177e4 1126
c6d14c84 1127 for_each_netdev_rcu(net, dev) {
072047e4 1128 struct inet6_dev *idev;
072047e4 1129
a9b05723 1130 /* Candidate Source Address (section 4)
072047e4
YH		 1131 * - multicast and link-local destination address,
1132 * the set of candidate source address MUST only
1133 * include addresses assigned to interfaces
1134 * belonging to the same link as the outgoing
1135 * interface.
1136 * (- For site-local destination addresses, the
1137 * set of candidate source addresses MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same site as the outgoing
1140 * interface.)
1141 */
a9b05723
YH		 1142 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1143 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1144 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1145 continue;
1da177e4 1146
1da177e4 1147 idev = __in6_dev_get(dev);
072047e4
YH		 1148 if (!idev)
1149 continue;
1150
1151 read_lock_bh(&idev->lock);
502a2ffd 1152 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1153 int i;
072047e4 1154
a9b05723 1155 /*
6b3ae80a
YH		 1156 * - Tentative Address (RFC2462 section 5.4)
1157 * - A tentative address is not considered
1158 * "assigned to an interface" in the traditional
95c385b4 1159 * sense, unless it is also flagged as optimistic.
6b3ae80a 1160 * - Candidate Source Address (section 4)
072047e4
YH		 1161 * - In any case, anycast addresses, multicast
1162 * addresses, and the unspecified address MUST
1163 * NOT be included in a candidate set.
1164 */
a9b05723
YH		 1165 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1166 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1167 continue;
a9b05723
YH		 1168
1169 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1170
1171 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1172 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1173 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1174 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1175 "assigned as unicast address on %s",
1176 dev->name);
1177 continue;
1178 }
1179
a9b05723
YH		 1180 score->rule = -1;
1181 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1182
1183 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1184 int minihiscore, miniscore;
1185
3de23255
BT		 1186 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1187 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1188
1189 if (minihiscore > miniscore) {
1190 if (i == IPV6_SADDR_RULE_SCOPE &&
1191 score->scopedist > 0) {
1192 /*
1193 * special case:
1194 * each remaining entry
1195 * has too small (not enough)
1196 * scope, because ifa entries
1197 * are sorted by their scope
1198 * values.
1199 */
1200 goto try_nextdev;
1201 }
1202 break;
1203 } else if (minihiscore < miniscore) {
a9b05723
YH		 1204 if (hiscore->ifa)
1205 in6_ifa_put(hiscore->ifa);
1206
1207 in6_ifa_hold(score->ifa);
1208
a0bffffc 1209 swap(hiscore, score);
a9b05723
YH		 1210
1211 /* restore our iterator */
1212 score->ifa = hiscore->ifa;
1213
1214 break;
1da177e4 1215 }
072047e4 1216 }
1da177e4 1217 }
a9b05723 1218try_nextdev:
072047e4 1219 read_unlock_bh(&idev->lock);
1da177e4 1220 }
8814c4b5 1221 rcu_read_unlock();
1da177e4 1222
a9b05723 1223 if (!hiscore->ifa)
072047e4 1224 return -EADDRNOTAVAIL;
1ab1457c 1225
4e3fd7a0 1226 *saddr = hiscore->ifa->addr;
a9b05723 1227 in6_ifa_put(hiscore->ifa);
072047e4 1228 return 0;
1da177e4 1229}
5e5f3f0f 1230EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1231
95c385b4
NH		 1232int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1233 unsigned char banned_flags)
1da177e4
LT		 1234{
1235 struct inet6_dev *idev;
1236 int err = -EADDRNOTAVAIL;
1237
8814c4b5 1238 rcu_read_lock();
e21e8467
SH		 1239 idev = __in6_dev_get(dev);
1240 if (idev) {
1da177e4
LT		 1241 struct inet6_ifaddr *ifp;
1242
1243 read_lock_bh(&idev->lock);
502a2ffd 1244 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1245 if (ifp->scope == IFA_LINK &&
1246 !(ifp->flags & banned_flags)) {
4e3fd7a0 1247 *addr = ifp->addr;
1da177e4
LT		 1248 err = 0;
1249 break;
1250 }
1251 }
1252 read_unlock_bh(&idev->lock);
1253 }
8814c4b5 1254 rcu_read_unlock();
1da177e4
LT		 1255 return err;
1256}
1257
1258static int ipv6_count_addresses(struct inet6_dev *idev)
1259{
1260 int cnt = 0;
1261 struct inet6_ifaddr *ifp;
1262
1263 read_lock_bh(&idev->lock);
502a2ffd 1264 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1265 cnt++;
1266 read_unlock_bh(&idev->lock);
1267 return cnt;
1268}
1269
b71d1d42 1270int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1271 struct net_device *dev, int strict)
1da177e4 1272{
eedf042a 1273 struct inet6_ifaddr *ifp;
c2e21293 1274 struct hlist_node *node;
3a88a81d 1275 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1276
5c578aed 1277 rcu_read_lock_bh();
1278 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1279 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1280 continue;
1da177e4 1281 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1282 !(ifp->flags&IFA_F_TENTATIVE) &&
1283 (dev == NULL || ifp->idev->dev == dev ||
1284 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1285 rcu_read_unlock_bh();
1286 return 1;
1da177e4
LT		 1287 }
1288 }
5c578aed 1289
eedf042a
SH		 1290 rcu_read_unlock_bh();
1291 return 0;
1da177e4 1292}
7159039a
YH		 1293EXPORT_SYMBOL(ipv6_chk_addr);
1294
3e81c6da
DM		 1295static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1296 struct net_device *dev)
1da177e4 1297{
3e81c6da 1298 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1299 struct inet6_ifaddr *ifp;
1300 struct hlist_node *node;
1da177e4 1301
c2e21293 1302 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1303 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1304 continue;
1da177e4
LT		 1305 if (ipv6_addr_equal(&ifp->addr, addr)) {
1306 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1307 return true;
1da177e4
LT		 1308 }
1309 }
3e81c6da 1310 return false;
1da177e4
LT		 1311}
1312
b71d1d42 1313int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1314{
1315 struct inet6_dev *idev;
1316 struct inet6_ifaddr *ifa;
1317 int onlink;
1318
1319 onlink = 0;
1320 rcu_read_lock();
1321 idev = __in6_dev_get(dev);
1322 if (idev) {
1323 read_lock_bh(&idev->lock);
502a2ffd 1324 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1325 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1326 ifa->prefix_len);
1327 if (onlink)
1328 break;
1329 }
1330 read_unlock_bh(&idev->lock);
1331 }
1332 rcu_read_unlock();
1333 return onlink;
1334}
52eeeb84
YH		 1335EXPORT_SYMBOL(ipv6_chk_prefix);
1336
9acd9f3a 1337struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1338 struct net_device *dev, int strict)
1da177e4 1339{
b79d1d54 1340 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1341 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1342 struct hlist_node *node;
1da177e4 1343
5c578aed 1344 rcu_read_lock_bh();
4f70ecca 1345 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1346 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1347 continue;
1da177e4
LT		 1348 if (ipv6_addr_equal(&ifp->addr, addr)) {
1349 if (dev == NULL || ifp->idev->dev == dev ||
1350 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1351 result = ifp;
1da177e4
LT		 1352 in6_ifa_hold(ifp);
1353 break;
1354 }
1355 }
1356 }
5c578aed 1357 rcu_read_unlock_bh();
1da177e4 1358
b79d1d54 1359 return result;
1da177e4
LT		 1360}
1361
1da177e4
LT		 1362/* Gets referenced address, destroys ifaddr */
1363
cc411d0b 1364static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1365{
1da177e4
LT		 1366 if (ifp->flags&IFA_F_PERMANENT) {
1367 spin_lock_bh(&ifp->lock);
1368 addrconf_del_timer(ifp);
1369 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1370 if (dad_failed)
1371 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1372 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1373 if (dad_failed)
1374 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1375 in6_ifa_put(ifp);
1376#ifdef CONFIG_IPV6_PRIVACY
1377 } else if (ifp->flags&IFA_F_TEMPORARY) {
1378 struct inet6_ifaddr *ifpub;
1379 spin_lock_bh(&ifp->lock);
1380 ifpub = ifp->ifpub;
1381 if (ifpub) {
1382 in6_ifa_hold(ifpub);
1383 spin_unlock_bh(&ifp->lock);
1384 ipv6_create_tempaddr(ifpub, ifp);
1385 in6_ifa_put(ifpub);
1386 } else {
1387 spin_unlock_bh(&ifp->lock);
1388 }
1389 ipv6_del_addr(ifp);
1390#endif
1391 } else
1392 ipv6_del_addr(ifp);
1393}
1394
f2344a13
HX		 1395static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1396{
1397 int err = -ENOENT;
1398
1399 spin_lock(&ifp->state_lock);
1400 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1401 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1402 err = 0;
1403 }
1404 spin_unlock(&ifp->state_lock);
1405
1406 return err;
1407}
1408
3c21edbd
YH		 1409void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1410{
1b34be74 1411 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1412
853dc2e0
UB		 1413 if (addrconf_dad_end(ifp)) {
1414 in6_ifa_put(ifp);
f2344a13 1415 return;
853dc2e0 1416 }
f2344a13 1417
e87cc472
JP		 1418 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1419 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1420
1b34be74
YH		 1421 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1422 struct in6_addr addr;
1423
1424 addr.s6_addr32[0] = htonl(0xfe800000);
1425 addr.s6_addr32[1] = 0;
1426
1427 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1428 ipv6_addr_equal(&ifp->addr, &addr)) {
1429 /* DAD failed for link-local based on MAC address */
1430 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1431
1432 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1433 ifp->idev->dev->name);
1b34be74
YH		 1434 }
1435 }
1436
cc411d0b 1437 addrconf_dad_stop(ifp, 1);
3c21edbd 1438}
1da177e4
LT		 1439
1440/* Join to solicited addr multicast group. */
1441
b71d1d42 1442void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1443{
1444 struct in6_addr maddr;
1445
1446 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1447 return;
1448
1449 addrconf_addr_solict_mult(addr, &maddr);
1450 ipv6_dev_mc_inc(dev, &maddr);
1451}
1452
b71d1d42 1453void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1454{
1455 struct in6_addr maddr;
1456
1457 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1458 return;
1459
1460 addrconf_addr_solict_mult(addr, &maddr);
1461 __ipv6_dev_mc_dec(idev, &maddr);
1462}
1463
20380731 1464static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1465{
1466 struct in6_addr addr;
2bda8a0c
BM		 1467 if (ifp->prefix_len == 127) /* RFC 6164 */
1468 return;
1da177e4
LT		 1469 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1470 if (ipv6_addr_any(&addr))
1471 return;
1472 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1473}
1474
20380731 1475static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1476{
1477 struct in6_addr addr;
32019e65
YH		 1478 if (ifp->prefix_len == 127) /* RFC 6164 */
1479 return;
1da177e4
LT		 1480 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1481 if (ipv6_addr_any(&addr))
1482 return;
1483 __ipv6_dev_ac_dec(ifp->idev, &addr);
1484}
1485
073a8e0e
YH		 1486static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1487{
1488 if (dev->addr_len != ETH_ALEN)
1489 return -1;
1490 memcpy(eui, dev->dev_addr, 3);
1491 memcpy(eui + 5, dev->dev_addr + 3, 3);
1492
1493 /*
1494 * The zSeries OSA network cards can be shared among various
1495 * OS instances, but the OSA cards have only one MAC address.
1496 * This leads to duplicate address conflicts in conjunction
1497 * with IPv6 if more than one instance uses the same card.
1498 *
1499 * The driver for these cards can deliver a unique 16-bit
1500 * identifier for each instance sharing the same card. It is
1501 * placed instead of 0xFFFE in the interface identifier. The
1502 * "u" bit of the interface identifier is not inverted in this
1503 * case. Hence the resulting interface identifier has local
1504 * scope according to RFC2373.
1505 */
1506 if (dev->dev_id) {
1507 eui[3] = (dev->dev_id >> 8) & 0xFF;
1508 eui[4] = dev->dev_id & 0xFF;
1509 } else {
1510 eui[3] = 0xFF;
1511 eui[4] = 0xFE;
1512 eui[0] ^= 2;
1513 }
1514 return 0;
1515}
1516
06a4c1c5 1517static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1518{
1519 if (dev->addr_len != IEEE802154_ADDR_LEN)
1520 return -1;
1521 memcpy(eui, dev->dev_addr, 8);
1522 return 0;
1523}
1524
073a8e0e
YH		 1525static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1526{
1527 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1528 if (dev->addr_len != ARCNET_ALEN)
1529 return -1;
1530 memset(eui, 0, 7);
8e5e8f30 1531 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1532 return 0;
1533}
1534
1535static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1536{
1537 if (dev->addr_len != INFINIBAND_ALEN)
1538 return -1;
1539 memcpy(eui, dev->dev_addr + 12, 8);
1540 eui[0] |= 2;
1541 return 0;
1542}
1543
c61393ea 1544static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1545{
9af28511
SH		 1546 if (addr == 0)
1547 return -1;
dfd982ba
YH		 1548 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1549 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1550 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1551 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1552 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1553 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1554 eui[1] = 0;
1555 eui[2] = 0x5E;
1556 eui[3] = 0xFE;
1557 memcpy(eui + 4, &addr, 4);
1558 return 0;
1559}
dfd982ba
YH		 1560
1561static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1562{
1563 if (dev->priv_flags & IFF_ISATAP)
1564 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1565 return -1;
1566}
1567
aee80b54 1568static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1569{
1570 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1571}
1572
1da177e4
LT		 1573static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1574{
1575 switch (dev->type) {
1576 case ARPHRD_ETHER:
1577 case ARPHRD_FDDI:
073a8e0e 1578 return addrconf_ifid_eui48(eui, dev);
1da177e4 1579 case ARPHRD_ARCNET:
073a8e0e 1580 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1581 case ARPHRD_INFINIBAND:
073a8e0e 1582 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1583 case ARPHRD_SIT:
dfd982ba 1584 return addrconf_ifid_sit(eui, dev);
aee80b54 1585 case ARPHRD_IPGRE:
1586 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1587 case ARPHRD_IEEE802154:
1588 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1589 }
1590 return -1;
1591}
1592
1593static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1594{
1595 int err = -1;
1596 struct inet6_ifaddr *ifp;
1597
1598 read_lock_bh(&idev->lock);
502a2ffd 1599 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1600 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1601 memcpy(eui, ifp->addr.s6_addr+8, 8);
1602 err = 0;
1603 break;
1604 }
1605 }
1606 read_unlock_bh(&idev->lock);
1607 return err;
1608}
1609
1610#ifdef CONFIG_IPV6_PRIVACY
1611/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1612static int __ipv6_regen_rndid(struct inet6_dev *idev)
1613{
1da177e4 1614regen:
955189ef 1615 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1616 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1617
1618 /*
1619 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1620 * check if generated address is not inappropriate
1621 *
1622 * - Reserved subnet anycast (RFC 2526)
1623 * 11111101 11....11 1xxxxxxx
c7dc89c0 1624 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1625 * 00-00-5E-FE-xx-xx-xx-xx
1626 * - value 0
1627 * - XXX: already assigned to an address on the device
1628 */
1ab1457c 1629 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1630 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1631 (idev->rndid[7]&0x80))
1632 goto regen;
1633 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1634 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1635 goto regen;
1636 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1637 goto regen;
1638 }
1639
1640 return 0;
1641}
1642
1643static void ipv6_regen_rndid(unsigned long data)
1644{
1645 struct inet6_dev *idev = (struct inet6_dev *) data;
1646 unsigned long expires;
1647
8814c4b5 1648 rcu_read_lock_bh();
1da177e4
LT		 1649 write_lock_bh(&idev->lock);
1650
1651 if (idev->dead)
1652 goto out;
1653
1654 if (__ipv6_regen_rndid(idev) < 0)
1655 goto out;
1ab1457c 1656
1da177e4 1657 expires = jiffies +
1ab1457c 1658 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1659 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1660 idev->cnf.max_desync_factor * HZ;
1da177e4
LT		 1661 if (time_before(expires, jiffies)) {
1662 printk(KERN_WARNING
1663 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1664 idev->dev->name);
1665 goto out;
1666 }
1667
1668 if (!mod_timer(&idev->regen_timer, expires))
1669 in6_dev_hold(idev);
1670
1671out:
1672 write_unlock_bh(&idev->lock);
8814c4b5 1673 rcu_read_unlock_bh();
1da177e4
LT		 1674 in6_dev_put(idev);
1675}
1676
8e5e8f30
EZ		 1677static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1678{
1da177e4
LT		 1679 int ret = 0;
1680
1681 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1682 ret = __ipv6_regen_rndid(idev);
1683 return ret;
1684}
1685#endif
1686
1687/*
1688 * Add prefix route.
1689 */
1690
1691static void
1692addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1693 unsigned long expires, u32 flags)
1da177e4 1694{
86872cb5
TG		 1695 struct fib6_config cfg = {
1696 .fc_table = RT6_TABLE_PREFIX,
1697 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1698 .fc_ifindex = dev->ifindex,
1699 .fc_expires = expires,
1700 .fc_dst_len = plen,
1701 .fc_flags = RTF_UP | flags,
c346dca1 1702 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1703 .fc_protocol = RTPROT_KERNEL,
86872cb5 1704 };
1da177e4 1705
4e3fd7a0 1706 cfg.fc_dst = *pfx;
1da177e4
LT		 1707
1708 /* Prevent useless cloning on PtP SIT.
1709 This thing is done here expecting that the whole
1710 class of non-broadcast devices need not cloning.
1711 */
0be669bb 1712#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1713 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1714 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1715#endif
1da177e4 1716
86872cb5 1717 ip6_route_add(&cfg);
1da177e4
LT		 1718}
1719
14ef37b6
AH		 1720
1721static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1722 int plen,
1723 const struct net_device *dev,
1724 u32 flags, u32 noflags)
1725{
1726 struct fib6_node *fn;
1727 struct rt6_info *rt = NULL;
1728 struct fib6_table *table;
1729
1730 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1731 if (table == NULL)
1732 return NULL;
1733
1734 write_lock_bh(&table->tb6_lock);
1735 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1736 if (!fn)
1737 goto out;
1738 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1739 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1740 continue;
1741 if ((rt->rt6i_flags & flags) != flags)
1742 continue;
1743 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1744 continue;
1745 dst_hold(&rt->dst);
1746 break;
1747 }
1748out:
1749 write_unlock_bh(&table->tb6_lock);
1750 return rt;
1751}
1752
1753
1da177e4
LT		 1754/* Create "default" multicast route to the interface */
1755
1756static void addrconf_add_mroute(struct net_device *dev)
1757{
86872cb5
TG		 1758 struct fib6_config cfg = {
1759 .fc_table = RT6_TABLE_LOCAL,
1760 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1761 .fc_ifindex = dev->ifindex,
1762 .fc_dst_len = 8,
1763 .fc_flags = RTF_UP,
c346dca1 1764 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1765 };
1766
1767 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1768
1769 ip6_route_add(&cfg);
1da177e4
LT		 1770}
1771
0be669bb 1772#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1773static void sit_route_add(struct net_device *dev)
1774{
86872cb5
TG		 1775 struct fib6_config cfg = {
1776 .fc_table = RT6_TABLE_MAIN,
1777 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1778 .fc_ifindex = dev->ifindex,
1779 .fc_dst_len = 96,
1780 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1781 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1782 };
1da177e4
LT		 1783
1784 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1785 ip6_route_add(&cfg);
1da177e4 1786}
0be669bb 1787#endif
1da177e4
LT		 1788
1789static void addrconf_add_lroute(struct net_device *dev)
1790{
1791 struct in6_addr addr;
1792
1793 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1794 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1795}
1796
1797static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1798{
1799 struct inet6_dev *idev;
1800
1801 ASSERT_RTNL();
1802
e21e8467
SH		 1803 idev = ipv6_find_idev(dev);
1804 if (!idev)
64e724f6
BH		 1805 return ERR_PTR(-ENOBUFS);
1806
1807 if (idev->cnf.disable_ipv6)
1808 return ERR_PTR(-EACCES);
1da177e4
LT		 1809
1810 /* Add default multicast route */
4af04aba
LW		 1811 if (!(dev->flags & IFF_LOOPBACK))
1812 addrconf_add_mroute(dev);
1da177e4
LT		 1813
1814 /* Add link local route */
1815 addrconf_add_lroute(dev);
1816 return idev;
1817}
1818
e6bff995 1819void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1820{
1821 struct prefix_info *pinfo;
1822 __u32 valid_lft;
1823 __u32 prefered_lft;
1824 int addr_type;
1da177e4 1825 struct inet6_dev *in6_dev;
56d417b1 1826 struct net *net = dev_net(dev);
1da177e4
LT		 1827
1828 pinfo = (struct prefix_info *) opt;
1ab1457c 1829
1da177e4
LT		 1830 if (len < sizeof(struct prefix_info)) {
1831 ADBG(("addrconf: prefix option too short\n"));
1832 return;
1833 }
1ab1457c 1834
1da177e4
LT		 1835 /*
1836 * Validation checks ([ADDRCONF], page 19)
1837 */
1838
1839 addr_type = ipv6_addr_type(&pinfo->prefix);
1840
1841 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1842 return;
1843
1844 valid_lft = ntohl(pinfo->valid);
1845 prefered_lft = ntohl(pinfo->prefered);
1846
1847 if (prefered_lft > valid_lft) {
e87cc472 1848 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1849 return;
1850 }
1851
1852 in6_dev = in6_dev_get(dev);
1853
1854 if (in6_dev == NULL) {
e87cc472
JP		 1855 net_dbg_ratelimited("addrconf: device %s not configured\n",
1856 dev->name);
1da177e4
LT		 1857 return;
1858 }
1859
1860 /*
1861 * Two things going on here:
1862 * 1) Add routes for on-link prefixes
1863 * 2) Configure prefixes with the auto flag set
1864 */
1865
4bed72e4
YH		 1866 if (pinfo->onlink) {
1867 struct rt6_info *rt;
1868 unsigned long rt_expires;
1869
6f704992
YH		 1870 /* Avoid arithmetic overflow. Really, we could
1871 * save rt_expires in seconds, likely valid_lft,
1872 * but it would require division in fib gc, that it
1873 * not good.
1874 */
4bed72e4
YH		 1875 if (HZ > USER_HZ)
1876 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1877 else
1878 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1879
4bed72e4
YH		 1880 if (addrconf_finite_timeout(rt_expires))
1881 rt_expires *= HZ;
1da177e4 1882
14ef37b6
AH		 1883 rt = addrconf_get_prefix_route(&pinfo->prefix,
1884 pinfo->prefix_len,
1885 dev,
1886 RTF_ADDRCONF | RTF_PREFIX_RT,
1887 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 1888
14ef37b6 1889 if (rt) {
6f704992
YH		 1890 /* Autoconf prefix route */
1891 if (valid_lft == 0) {
1892 ip6_del_rt(rt);
1893 rt = NULL;
4bed72e4 1894 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 1895 /* not infinity */
1716a961 1896 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 1897 } else {
1716a961 1898 rt6_clean_expires(rt);
1da177e4
LT		 1899 }
1900 } else if (valid_lft) {
6f704992 1901 clock_t expires = 0;
4bed72e4
YH		 1902 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1903 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1904 /* not infinity */
1905 flags |= RTF_EXPIRES;
1906 expires = jiffies_to_clock_t(rt_expires);
1907 }
1da177e4 1908 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1909 dev, expires, flags);
1da177e4
LT		 1910 }
1911 if (rt)
d8d1f30b 1912 dst_release(&rt->dst);
1da177e4
LT		 1913 }
1914
1915 /* Try to figure out our local address for this prefix */
1916
1917 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 1918 struct inet6_ifaddr *ifp;
1da177e4
LT		 1919 struct in6_addr addr;
1920 int create = 0, update_lft = 0;
1921
1922 if (pinfo->prefix_len == 64) {
1923 memcpy(&addr, &pinfo->prefix, 8);
1924 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1925 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1926 in6_dev_put(in6_dev);
1927 return;
1928 }
1929 goto ok;
1930 }
e87cc472
JP		 1931 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1932 pinfo->prefix_len);
1da177e4
LT		 1933 in6_dev_put(in6_dev);
1934 return;
1935
1936ok:
1937
53b7997f 1938 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1939
1940 if (ifp == NULL && valid_lft) {
1941 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1942 u32 addr_flags = 0;
1943
1944#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1945 if (in6_dev->cnf.optimistic_dad &&
e6bff995 1946 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 1947 addr_flags = IFA_F_OPTIMISTIC;
1948#endif
1da177e4
LT		 1949
1950 /* Do not allow to create too much of autoconfigured
1951 * addresses; this would be too easy way to crash kernel.
1952 */
1953 if (!max_addresses ||
1954 ipv6_count_addresses(in6_dev) < max_addresses)
1955 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1956 addr_type&IPV6_ADDR_SCOPE_MASK,
1957 addr_flags);
1da177e4
LT		 1958
1959 if (!ifp || IS_ERR(ifp)) {
1960 in6_dev_put(in6_dev);
1961 return;
1962 }
1963
1964 update_lft = create = 1;
1965 ifp->cstamp = jiffies;
cf22f9a2 1966 addrconf_dad_start(ifp);
1da177e4
LT		 1967 }
1968
1969 if (ifp) {
1970 int flags;
1971 unsigned long now;
1972#ifdef CONFIG_IPV6_PRIVACY
1973 struct inet6_ifaddr *ift;
1974#endif
1975 u32 stored_lft;
1976
1977 /* update lifetime (RFC2462 5.5.3 e) */
1978 spin_lock(&ifp->lock);
1979 now = jiffies;
1980 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1981 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1982 else
1983 stored_lft = 0;
1984 if (!update_lft && stored_lft) {
1985 if (valid_lft > MIN_VALID_LIFETIME ||
1986 valid_lft > stored_lft)
1987 update_lft = 1;
1988 else if (stored_lft <= MIN_VALID_LIFETIME) {
1989 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1990 /*
1991 * RFC 4862 Section 5.5.3e:
1992 * "Note that the preferred lifetime of
1993 * the corresponding address is always
1994 * reset to the Preferred Lifetime in
1995 * the received Prefix Information
1996 * option, regardless of whether the
1997 * valid lifetime is also reset or
1998 * ignored."
1999 *
2000 * So if the preferred lifetime in
2001 * this advertisement is different
2002 * than what we have stored, but the
2003 * valid lifetime is invalid, just
2004 * reset prefered_lft.
2005 *
2006 * We must set the valid lifetime
2007 * to the stored lifetime since we'll
2008 * be updating the timestamp below,
2009 * else we'll set it back to the
25985edc 2010 * minimum.
a1ed0526
BH		 2011 */
2012 if (prefered_lft != ifp->prefered_lft) {
2013 valid_lft = stored_lft;
2014 update_lft = 1;
2015 }
1da177e4
LT		 2016 } else {
2017 valid_lft = MIN_VALID_LIFETIME;
2018 if (valid_lft < prefered_lft)
2019 prefered_lft = valid_lft;
2020 update_lft = 1;
2021 }
2022 }
2023
2024 if (update_lft) {
2025 ifp->valid_lft = valid_lft;
2026 ifp->prefered_lft = prefered_lft;
2027 ifp->tstamp = now;
2028 flags = ifp->flags;
2029 ifp->flags &= ~IFA_F_DEPRECATED;
2030 spin_unlock(&ifp->lock);
2031
2032 if (!(flags&IFA_F_TENTATIVE))
2033 ipv6_ifa_notify(0, ifp);
2034 } else
2035 spin_unlock(&ifp->lock);
2036
2037#ifdef CONFIG_IPV6_PRIVACY
2038 read_lock_bh(&in6_dev->lock);
2039 /* update all temporary addresses in the list */
76f793e3
LC		 2040 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2041 tmp_list) {
2042 int age, max_valid, max_prefered;
2043
c6fbfac2
BB		 2044 if (ifp != ift->ifpub)
2045 continue;
2046
76f793e3
LC		 2047 /*
2048 * RFC 4941 section 3.3:
2049 * If a received option will extend the lifetime
2050 * of a public address, the lifetimes of
2051 * temporary addresses should be extended,
2052 * subject to the overall constraint that no
2053 * temporary addresses should ever remain
2054 * "valid" or "preferred" for a time longer than
2055 * (TEMP_VALID_LIFETIME) or
2056 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2057 * respectively.
2058 */
2059 age = (now - ift->cstamp) / HZ;
2060 max_valid = in6_dev->cnf.temp_valid_lft - age;
2061 if (max_valid < 0)
2062 max_valid = 0;
2063
2064 max_prefered = in6_dev->cnf.temp_prefered_lft -
2065 in6_dev->cnf.max_desync_factor -
2066 age;
2067 if (max_prefered < 0)
2068 max_prefered = 0;
2069
2070 if (valid_lft > max_valid)
2071 valid_lft = max_valid;
2072
2073 if (prefered_lft > max_prefered)
2074 prefered_lft = max_prefered;
2075
1da177e4
LT		 2076 spin_lock(&ift->lock);
2077 flags = ift->flags;
76f793e3
LC		 2078 ift->valid_lft = valid_lft;
2079 ift->prefered_lft = prefered_lft;
2080 ift->tstamp = now;
2081 if (prefered_lft > 0)
2082 ift->flags &= ~IFA_F_DEPRECATED;
2083
1da177e4
LT		 2084 spin_unlock(&ift->lock);
2085 if (!(flags&IFA_F_TENTATIVE))
2086 ipv6_ifa_notify(0, ift);
2087 }
2088
aed65501 2089 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2090 /*
76f793e3
LC		 2091 * When a new public address is created as
2092 * described in [ADDRCONF], also create a new
2093 * temporary address. Also create a temporary
2094 * address if it's enabled but no temporary
2095 * address currently exists.
1da177e4 2096 */
1ab1457c 2097 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2098 ipv6_create_tempaddr(ifp, NULL);
2099 } else {
2100 read_unlock_bh(&in6_dev->lock);
2101 }
2102#endif
2103 in6_ifa_put(ifp);
2104 addrconf_verify(0);
2105 }
2106 }
2107 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2108 in6_dev_put(in6_dev);
2109}
2110
2111/*
2112 * Set destination address.
2113 * Special case for SIT interfaces where we create a new "virtual"
2114 * device.
2115 */
af284937 2116int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2117{
2118 struct in6_ifreq ireq;
2119 struct net_device *dev;
2120 int err = -EINVAL;
2121
2122 rtnl_lock();
2123
2124 err = -EFAULT;
2125 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2126 goto err_exit;
2127
af284937 2128 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2129
2130 err = -ENODEV;
2131 if (dev == NULL)
2132 goto err_exit;
2133
0be669bb 2134#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2135 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2136 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2137 struct ifreq ifr;
1da177e4
LT		 2138 struct ip_tunnel_parm p;
2139
2140 err = -EADDRNOTAVAIL;
2141 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2142 goto err_exit;
2143
2144 memset(&p, 0, sizeof(p));
2145 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2146 p.iph.saddr = 0;
2147 p.iph.version = 4;
2148 p.iph.ihl = 5;
2149 p.iph.protocol = IPPROTO_IPV6;
2150 p.iph.ttl = 64;
d20b3109 2151 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2152
5bc3eb7e
SH		 2153 if (ops->ndo_do_ioctl) {
2154 mm_segment_t oldfs = get_fs();
2155
2156 set_fs(KERNEL_DS);
2157 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2158 set_fs(oldfs);
2159 } else
2160 err = -EOPNOTSUPP;
1da177e4
LT		 2161
2162 if (err == 0) {
2163 err = -ENOBUFS;
af284937
DL		 2164 dev = __dev_get_by_name(net, p.name);
2165 if (!dev)
1da177e4
LT		 2166 goto err_exit;
2167 err = dev_open(dev);
2168 }
2169 }
0be669bb 2170#endif
1da177e4
LT		 2171
2172err_exit:
2173 rtnl_unlock();
2174 return err;
2175}
2176
2177/*
2178 * Manual configuration of address on an interface
2179 */
b71d1d42 2180static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2181 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2182 __u32 valid_lft)
1da177e4
LT		 2183{
2184 struct inet6_ifaddr *ifp;
2185 struct inet6_dev *idev;
2186 struct net_device *dev;
2187 int scope;
6f704992
YH		 2188 u32 flags;
2189 clock_t expires;
4bed72e4 2190 unsigned long timeout;
1da177e4
LT		 2191
2192 ASSERT_RTNL();
1ab1457c 2193
24ef0da7
TG		 2194 if (plen > 128)
2195 return -EINVAL;
2196
0778769d
NT		 2197 /* check the lifetime */
2198 if (!valid_lft || prefered_lft > valid_lft)
2199 return -EINVAL;
2200
af284937
DL		 2201 dev = __dev_get_by_index(net, ifindex);
2202 if (!dev)
1da177e4 2203 return -ENODEV;
1ab1457c 2204
64e724f6
BH		 2205 idev = addrconf_add_dev(dev);
2206 if (IS_ERR(idev))
2207 return PTR_ERR(idev);
1da177e4
LT		 2208
2209 scope = ipv6_addr_scope(pfx);
2210
4bed72e4
YH		 2211 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2212 if (addrconf_finite_timeout(timeout)) {
2213 expires = jiffies_to_clock_t(timeout * HZ);
2214 valid_lft = timeout;
6f704992 2215 flags = RTF_EXPIRES;
4bed72e4
YH		 2216 } else {
2217 expires = 0;
2218 flags = 0;
2219 ifa_flags |= IFA_F_PERMANENT;
6f704992 2220 }
0778769d 2221
4bed72e4
YH		 2222 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2223 if (addrconf_finite_timeout(timeout)) {
2224 if (timeout == 0)
2225 ifa_flags |= IFA_F_DEPRECATED;
2226 prefered_lft = timeout;
2227 }
0778769d
NT		 2228
2229 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2230
1da177e4 2231 if (!IS_ERR(ifp)) {
06aebfb7 2232 spin_lock_bh(&ifp->lock);
0778769d
NT		 2233 ifp->valid_lft = valid_lft;
2234 ifp->prefered_lft = prefered_lft;
2235 ifp->tstamp = jiffies;
06aebfb7 2236 spin_unlock_bh(&ifp->lock);
0778769d 2237
46d48046 2238 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2239 expires, flags);
95c385b4
NH		 2240 /*
2241 * Note that section 3.1 of RFC 4429 indicates
2242 * that the Optimistic flag should not be set for
2243 * manually configured addresses
2244 */
cf22f9a2 2245 addrconf_dad_start(ifp);
1da177e4 2246 in6_ifa_put(ifp);
0778769d 2247 addrconf_verify(0);
1da177e4
LT		 2248 return 0;
2249 }
2250
2251 return PTR_ERR(ifp);
2252}
2253
b71d1d42 2254static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2255 unsigned int plen)
1da177e4
LT		 2256{
2257 struct inet6_ifaddr *ifp;
2258 struct inet6_dev *idev;
2259 struct net_device *dev;
1ab1457c 2260
24ef0da7
TG		 2261 if (plen > 128)
2262 return -EINVAL;
2263
af284937
DL		 2264 dev = __dev_get_by_index(net, ifindex);
2265 if (!dev)
1da177e4
LT		 2266 return -ENODEV;
2267
2268 if ((idev = __in6_dev_get(dev)) == NULL)
2269 return -ENXIO;
2270
2271 read_lock_bh(&idev->lock);
502a2ffd 2272 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2273 if (ifp->prefix_len == plen &&
2274 ipv6_addr_equal(pfx, &ifp->addr)) {
2275 in6_ifa_hold(ifp);
2276 read_unlock_bh(&idev->lock);
1ab1457c 2277
1da177e4
LT		 2278 ipv6_del_addr(ifp);
2279
2280 /* If the last address is deleted administratively,
2281 disable IPv6 on this interface.
2282 */
502a2ffd 2283 if (list_empty(&idev->addr_list))
1da177e4
LT		 2284 addrconf_ifdown(idev->dev, 1);
2285 return 0;
2286 }
2287 }
2288 read_unlock_bh(&idev->lock);
2289 return -EADDRNOTAVAIL;
2290}
2291
2292
af284937 2293int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2294{
2295 struct in6_ifreq ireq;
2296 int err;
1ab1457c 2297
1da177e4
LT		 2298 if (!capable(CAP_NET_ADMIN))
2299 return -EPERM;
1ab1457c 2300
1da177e4
LT		 2301 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2302 return -EFAULT;
2303
2304 rtnl_lock();
af284937
DL		 2305 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2306 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2307 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2308 rtnl_unlock();
2309 return err;
2310}
2311
af284937 2312int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2313{
2314 struct in6_ifreq ireq;
2315 int err;
1ab1457c 2316
1da177e4
LT		 2317 if (!capable(CAP_NET_ADMIN))
2318 return -EPERM;
2319
2320 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2321 return -EFAULT;
2322
2323 rtnl_lock();
af284937
DL		 2324 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2325 ireq.ifr6_prefixlen);
1da177e4
LT		 2326 rtnl_unlock();
2327 return err;
2328}
2329
b5f348e5
IJ		 2330static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2331 int plen, int scope)
2332{
2333 struct inet6_ifaddr *ifp;
2334
2335 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2336 if (!IS_ERR(ifp)) {
2337 spin_lock_bh(&ifp->lock);
2338 ifp->flags &= ~IFA_F_TENTATIVE;
2339 spin_unlock_bh(&ifp->lock);
2340 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2341 in6_ifa_put(ifp);
2342 }
2343}
2344
0be669bb 2345#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2346static void sit_add_v4_addrs(struct inet6_dev *idev)
2347{
1da177e4
LT		 2348 struct in6_addr addr;
2349 struct net_device *dev;
c346dca1 2350 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2351 int scope;
2352
2353 ASSERT_RTNL();
2354
2355 memset(&addr, 0, sizeof(struct in6_addr));
2356 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2357
2358 if (idev->dev->flags&IFF_POINTOPOINT) {
2359 addr.s6_addr32[0] = htonl(0xfe800000);
2360 scope = IFA_LINK;
2361 } else {
2362 scope = IPV6_ADDR_COMPATv4;
2363 }
2364
2365 if (addr.s6_addr32[3]) {
b5f348e5 2366 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2367 return;
2368 }
2369
6fda7350 2370 for_each_netdev(net, dev) {
8e5e8f30 2371 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2372 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2373 struct in_ifaddr *ifa;
1da177e4
LT		 2374
2375 int flag = scope;
2376
2377 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2378 int plen;
2379
2380 addr.s6_addr32[3] = ifa->ifa_local;
2381
2382 if (ifa->ifa_scope == RT_SCOPE_LINK)
2383 continue;
2384 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2385 if (idev->dev->flags&IFF_POINTOPOINT)
2386 continue;
2387 flag |= IFA_HOST;
2388 }
2389 if (idev->dev->flags&IFF_POINTOPOINT)
2390 plen = 64;
2391 else
2392 plen = 96;
2393
b5f348e5 2394 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2395 }
2396 }
1ab1457c 2397 }
1da177e4 2398}
0be669bb 2399#endif
1da177e4
LT		 2400
2401static void init_loopback(struct net_device *dev)
2402{
2403 struct inet6_dev *idev;
1da177e4
LT		 2404
2405 /* ::1 */
2406
2407 ASSERT_RTNL();
2408
2409 if ((idev = ipv6_find_idev(dev)) == NULL) {
2410 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2411 return;
2412 }
2413
b5f348e5 2414 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2415}
2416
b71d1d42 2417static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2418{
8e5e8f30 2419 struct inet6_ifaddr *ifp;
95c385b4
NH		 2420 u32 addr_flags = IFA_F_PERMANENT;
2421
2422#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2423 if (idev->cnf.optimistic_dad &&
702beb87 2424 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2425 addr_flags |= IFA_F_OPTIMISTIC;
2426#endif
1da177e4 2427
95c385b4
NH		 2428
2429 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2430 if (!IS_ERR(ifp)) {
46d48046 2431 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2432 addrconf_dad_start(ifp);
1da177e4
LT		 2433 in6_ifa_put(ifp);
2434 }
2435}
2436
2437static void addrconf_dev_config(struct net_device *dev)
2438{
2439 struct in6_addr addr;
8e5e8f30 2440 struct inet6_dev *idev;
1da177e4
LT		 2441
2442 ASSERT_RTNL();
2443
74235a25
HX		 2444 if ((dev->type != ARPHRD_ETHER) &&
2445 (dev->type != ARPHRD_FDDI) &&
74235a25 2446 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2447 (dev->type != ARPHRD_INFINIBAND) &&
2448 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2449 /* Alas, we support only Ethernet autoconfiguration. */
2450 return;
2451 }
2452
1da177e4 2453 idev = addrconf_add_dev(dev);
64e724f6 2454 if (IS_ERR(idev))
1da177e4
LT		 2455 return;
2456
2457 memset(&addr, 0, sizeof(struct in6_addr));
2458 addr.s6_addr32[0] = htonl(0xFE800000);
2459
2460 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2461 addrconf_add_linklocal(idev, &addr);
2462}
2463
0be669bb 2464#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2465static void addrconf_sit_config(struct net_device *dev)
2466{
2467 struct inet6_dev *idev;
2468
2469 ASSERT_RTNL();
2470
1ab1457c
YH		 2471 /*
2472 * Configure the tunnel with one of our IPv4
2473 * addresses... we should configure all of
1da177e4
LT		 2474 * our v4 addrs in the tunnel
2475 */
2476
2477 if ((idev = ipv6_find_idev(dev)) == NULL) {
2478 printk(KERN_DEBUG "init sit: add_dev failed\n");
2479 return;
2480 }
2481
c7dc89c0
FT		 2482 if (dev->priv_flags & IFF_ISATAP) {
2483 struct in6_addr addr;
2484
2485 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2486 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2487 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2488 addrconf_add_linklocal(idev, &addr);
2489 return;
2490 }
2491
1da177e4
LT		 2492 sit_add_v4_addrs(idev);
2493
2494 if (dev->flags&IFF_POINTOPOINT) {
2495 addrconf_add_mroute(dev);
2496 addrconf_add_lroute(dev);
2497 } else
2498 sit_route_add(dev);
2499}
0be669bb 2500#endif
1da177e4 2501
aee80b54 2502#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2503static void addrconf_gre_config(struct net_device *dev)
2504{
2505 struct inet6_dev *idev;
2506 struct in6_addr addr;
2507
2508 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2509
2510 ASSERT_RTNL();
2511
2512 if ((idev = ipv6_find_idev(dev)) == NULL) {
2513 printk(KERN_DEBUG "init gre: add_dev failed\n");
2514 return;
2515 }
2516
2517 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2518 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2519
2520 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2521 addrconf_add_linklocal(idev, &addr);
2522}
2523#endif
2524
1da177e4
LT		 2525static inline int
2526ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2527{
2528 struct in6_addr lladdr;
2529
95c385b4 2530 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2531 addrconf_add_linklocal(idev, &lladdr);
2532 return 0;
2533 }
2534 return -1;
2535}
2536
2537static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2538{
2539 struct net_device *link_dev;
c346dca1 2540 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2541
2542 /* first try to inherit the link-local address from the link device */
2543 if (idev->dev->iflink &&
6fda7350 2544 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2545 if (!ipv6_inherit_linklocal(idev, link_dev))
2546 return;
2547 }
2548 /* then try to inherit it from any device */
6fda7350 2549 for_each_netdev(net, link_dev) {
1da177e4
LT		 2550 if (!ipv6_inherit_linklocal(idev, link_dev))
2551 return;
2552 }
2553 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2554}
2555
2556/*
2557 * Autoconfigure tunnel with a link-local address so routing protocols,
2558 * DHCPv6, MLD etc. can be run over the virtual link
2559 */
2560
2561static void addrconf_ip6_tnl_config(struct net_device *dev)
2562{
2563 struct inet6_dev *idev;
2564
2565 ASSERT_RTNL();
2566
e21e8467 2567 idev = addrconf_add_dev(dev);
64e724f6 2568 if (IS_ERR(idev)) {
1da177e4
LT		 2569 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2570 return;
2571 }
2572 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2573}
2574
1ab1457c 2575static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2576 void *data)
1da177e4
LT		 2577{
2578 struct net_device *dev = (struct net_device *) data;
74235a25 2579 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2580 int run_pending = 0;
b217d616 2581 int err;
1da177e4 2582
e21e8467 2583 switch (event) {
45ba9dd2 2584 case NETDEV_REGISTER:
74235a25 2585 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2586 idev = ipv6_add_dev(dev);
2587 if (!idev)
b217d616 2588 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2589 }
2590 break;
bcdd553f 2591
1da177e4 2592 case NETDEV_UP:
3c21edbd 2593 case NETDEV_CHANGE:
c2edacf8
JV		 2594 if (dev->flags & IFF_SLAVE)
2595 break;
2596
3c21edbd 2597 if (event == NETDEV_UP) {
f24e3d65 2598 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2599 /* device is not ready yet. */
2600 printk(KERN_INFO
2601 "ADDRCONF(NETDEV_UP): %s: "
2602 "link is not ready\n",
2603 dev->name);
2604 break;
2605 }
99081049 2606
d31c7b8f
EP		 2607 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2608 idev = ipv6_add_dev(dev);
2609
e3ec6cfc 2610 if (idev) {
99081049 2611 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2612 run_pending = 1;
2613 }
3c21edbd 2614 } else {
f24e3d65 2615 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2616 /* device is still not ready. */
2617 break;
2618 }
2619
2620 if (idev) {
bcdd553f 2621 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2622 /* device is already configured. */
2623 break;
3c21edbd
YH		 2624 idev->if_flags |= IF_READY;
2625 }
2626
2627 printk(KERN_INFO
2628 "ADDRCONF(NETDEV_CHANGE): %s: "
2629 "link becomes ready\n",
2630 dev->name);
2631
c5e33bdd 2632 run_pending = 1;
3c21edbd
YH		 2633 }
2634
e21e8467 2635 switch (dev->type) {
0be669bb 2636#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2637 case ARPHRD_SIT:
2638 addrconf_sit_config(dev);
2639 break;
aee80b54 2640#endif
2641#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2642 case ARPHRD_IPGRE:
2643 addrconf_gre_config(dev);
2644 break;
0be669bb 2645#endif
1da177e4
LT		 2646 case ARPHRD_TUNNEL6:
2647 addrconf_ip6_tnl_config(dev);
2648 break;
2649 case ARPHRD_LOOPBACK:
2650 init_loopback(dev);
2651 break;
2652
2653 default:
2654 addrconf_dev_config(dev);
2655 break;
3ff50b79 2656 }
bcdd553f 2657
1da177e4 2658 if (idev) {
c5e33bdd
YH		 2659 if (run_pending)
2660 addrconf_dad_run(idev);
2661
bcdd553f
SH		 2662 /*
2663 * If the MTU changed during the interface down,
2664 * when the interface up, the changed MTU must be
2665 * reflected in the idev as well as routers.
1da177e4 2666 */
bcdd553f
SH		 2667 if (idev->cnf.mtu6 != dev->mtu &&
2668 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2669 rt6_mtu_change(dev, dev->mtu);
2670 idev->cnf.mtu6 = dev->mtu;
2671 }
2672 idev->tstamp = jiffies;
2673 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2674
2675 /*
2676 * If the changed mtu during down is lower than
2677 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2678 */
2679 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2680 addrconf_ifdown(dev, 1);
1da177e4
LT		 2681 }
2682 break;
2683
2684 case NETDEV_CHANGEMTU:
d31c7b8f 2685 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2686 rt6_mtu_change(dev, dev->mtu);
2687 idev->cnf.mtu6 = dev->mtu;
2688 break;
2689 }
2690
d31c7b8f
EP		 2691 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2692 idev = ipv6_add_dev(dev);
2693 if (idev)
2694 break;
2695 }
2696
bcdd553f
SH		 2697 /*
2698 * MTU falled under IPV6_MIN_MTU.
2699 * Stop IPv6 on this interface.
2700 */
1da177e4
LT		 2701
2702 case NETDEV_DOWN:
2703 case NETDEV_UNREGISTER:
2704 /*
2705 * Remove all addresses from this interface.
2706 */
2707 addrconf_ifdown(dev, event != NETDEV_DOWN);
2708 break;
3c21edbd 2709
1da177e4 2710 case NETDEV_CHANGENAME:
1da177e4 2711 if (idev) {
5632c515 2712 snmp6_unregister_dev(idev);
408c4768 2713 addrconf_sysctl_unregister(idev);
f52295a9 2714 addrconf_sysctl_register(idev);
b217d616
HX		 2715 err = snmp6_register_dev(idev);
2716 if (err)
2717 return notifier_from_errno(err);
5632c515 2718 }
1da177e4 2719 break;
bcdd553f 2720
93d9b7d7
JP		 2721 case NETDEV_PRE_TYPE_CHANGE:
2722 case NETDEV_POST_TYPE_CHANGE:
2723 addrconf_type_change(dev, event);
75c78500 2724 break;
3ff50b79 2725 }
1da177e4
LT		 2726
2727 return NOTIFY_OK;
2728}
2729
2730/*
2731 * addrconf module should be notified of a device going up
2732 */
2733static struct notifier_block ipv6_dev_notf = {
2734 .notifier_call = addrconf_notify,
1da177e4
LT		 2735};
2736
93d9b7d7 2737static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2738{
2739 struct inet6_dev *idev;
2740 ASSERT_RTNL();
2741
2742 idev = __in6_dev_get(dev);
2743
93d9b7d7 2744 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2745 ipv6_mc_remap(idev);
93d9b7d7 2746 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2747 ipv6_mc_unmap(idev);
2748}
2749
1da177e4
LT		 2750static int addrconf_ifdown(struct net_device *dev, int how)
2751{
c346dca1 2752 struct net *net = dev_net(dev);
502a2ffd 2753 struct inet6_dev *idev;
2754 struct inet6_ifaddr *ifa;
73a8bd74 2755 int state, i;
1da177e4
LT		 2756
2757 ASSERT_RTNL();
2758
73a8bd74
DM		 2759 rt6_ifdown(net, dev);
2760 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2761
2762 idev = __in6_dev_get(dev);
2763 if (idev == NULL)
2764 return -ENODEV;
2765
bcdd553f
SH		 2766 /*
2767 * Step 1: remove reference to ipv6 device from parent device.
2768 * Do not dev_put!
1da177e4 2769 */
439e2385 2770 if (how) {
1da177e4 2771 idev->dead = 1;
8814c4b5
YH		 2772
2773 /* protected by rtnl_lock */
a9b3cd7f 2774 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2775
2776 /* Step 1.5: remove snmp6 entry */
2777 snmp6_unregister_dev(idev);
2778
2779 }
2780
73a8bd74
DM		 2781 /* Step 2: clear hash table */
2782 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2783 struct hlist_head *h = &inet6_addr_lst[i];
2784 struct hlist_node *n;
2785
2786 spin_lock_bh(&addrconf_hash_lock);
2787 restart:
2788 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2789 if (ifa->idev == idev) {
2790 hlist_del_init_rcu(&ifa->addr_lst);
2791 addrconf_del_timer(ifa);
2792 goto restart;
2793 }
2794 }
2795 spin_unlock_bh(&addrconf_hash_lock);
2796 }
2797
1da177e4
LT		 2798 write_lock_bh(&idev->lock);
2799
bcdd553f 2800 /* Step 2: clear flags for stateless addrconf */
439e2385 2801 if (!how)
3c21edbd 2802 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2803
1da177e4 2804#ifdef CONFIG_IPV6_PRIVACY
439e2385 2805 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2806 in6_dev_put(idev);
2807
bcdd553f 2808 /* Step 3: clear tempaddr list */
372e6c8f 2809 while (!list_empty(&idev->tempaddr_list)) {
2810 ifa = list_first_entry(&idev->tempaddr_list,
2811 struct inet6_ifaddr, tmp_list);
2812 list_del(&ifa->tmp_list);
1da177e4
LT		 2813 write_unlock_bh(&idev->lock);
2814 spin_lock_bh(&ifa->lock);
2815
2816 if (ifa->ifpub) {
2817 in6_ifa_put(ifa->ifpub);
2818 ifa->ifpub = NULL;
2819 }
2820 spin_unlock_bh(&ifa->lock);
2821 in6_ifa_put(ifa);
2822 write_lock_bh(&idev->lock);
2823 }
2824#endif
8f37ada5 2825
502a2ffd 2826 while (!list_empty(&idev->addr_list)) {
2827 ifa = list_first_entry(&idev->addr_list,
2828 struct inet6_ifaddr, if_list);
84e8b803 2829 addrconf_del_timer(ifa);
2830
73a8bd74 2831 list_del(&ifa->if_list);
84e8b803 2832
73a8bd74 2833 write_unlock_bh(&idev->lock);
84e8b803 2834
73a8bd74
DM		 2835 spin_lock_bh(&ifa->state_lock);
2836 state = ifa->state;
2837 ifa->state = INET6_IFADDR_STATE_DEAD;
2838 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2839
73a8bd74
DM		 2840 if (state != INET6_IFADDR_STATE_DEAD) {
2841 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2842 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2843 }
73a8bd74 2844 in6_ifa_put(ifa);
8f37ada5 2845
73a8bd74
DM		 2846 write_lock_bh(&idev->lock);
2847 }
8f37ada5 2848
1da177e4
LT		 2849 write_unlock_bh(&idev->lock);
2850
2851 /* Step 5: Discard multicast list */
439e2385 2852 if (how)
1da177e4
LT		 2853 ipv6_mc_destroy_dev(idev);
2854 else
2855 ipv6_mc_down(idev);
2856
1da177e4 2857 idev->tstamp = jiffies;
1ab1457c 2858
bcdd553f 2859 /* Last: Shot the device (if unregistered) */
439e2385 2860 if (how) {
408c4768 2861 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2862 neigh_parms_release(&nd_tbl, idev->nd_parms);
2863 neigh_ifdown(&nd_tbl, dev);
2864 in6_dev_put(idev);
2865 }
2866 return 0;
2867}
2868
2869static void addrconf_rs_timer(unsigned long data)
2870{
2871 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2872 struct inet6_dev *idev = ifp->idev;
1da177e4 2873
5b2a1953 2874 read_lock(&idev->lock);
2875 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2876 goto out;
2877
5b2a1953 2878 if (idev->cnf.forwarding)
2879 goto out;
2880
2881 /* Announcement received after solicitation was sent */
2882 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2883 goto out;
1da177e4
LT		 2884
2885 spin_lock(&ifp->lock);
5b2a1953 2886 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2887 /* The wait after the last probe can be shorter */
2888 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2889 (ifp->probes == idev->cnf.rtr_solicits) ?
2890 idev->cnf.rtr_solicit_delay :
2891 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2892 spin_unlock(&ifp->lock);
2893
5b2a1953 2894 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2895 } else {
2896 spin_unlock(&ifp->lock);
2897 /*
2898 * Note: we do not support deprecated "all on-link"
2899 * assumption any longer.
2900 */
2901 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2902 idev->dev->name);
1da177e4
LT		 2903 }
2904
2905out:
5b2a1953 2906 read_unlock(&idev->lock);
1da177e4
LT		 2907 in6_ifa_put(ifp);
2908}
2909
2910/*
2911 * Duplicate Address Detection
2912 */
3c21edbd
YH		 2913static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2914{
2915 unsigned long rand_num;
2916 struct inet6_dev *idev = ifp->idev;
2917
95c385b4
NH		 2918 if (ifp->flags & IFA_F_OPTIMISTIC)
2919 rand_num = 0;
2920 else
2921 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2922
3c21edbd
YH		 2923 ifp->probes = idev->cnf.dad_transmits;
2924 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2925}
2926
cf22f9a2 2927static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 2928{
2929 struct inet6_dev *idev = ifp->idev;
2930 struct net_device *dev = idev->dev;
1da177e4
LT		 2931
2932 addrconf_join_solict(dev, &ifp->addr);
2933
1da177e4 2934 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2935
2936 read_lock_bh(&idev->lock);
622ccdf1 2937 spin_lock(&ifp->lock);
e9d3e084 2938 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2939 goto out;
1da177e4
LT		 2940
2941 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2942 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2943 !(ifp->flags&IFA_F_TENTATIVE) ||
2944 ifp->flags & IFA_F_NODAD) {
cc411d0b 2945 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2946 spin_unlock(&ifp->lock);
1da177e4
LT		 2947 read_unlock_bh(&idev->lock);
2948
2949 addrconf_dad_completed(ifp);
2950 return;
2951 }
2952
6732bade 2953 if (!(idev->if_flags & IF_READY)) {
21809faf 2954 spin_unlock(&ifp->lock);
6732bade 2955 read_unlock_bh(&idev->lock);
3c21edbd 2956 /*
590a9887 2957 * If the device is not ready:
3c21edbd
YH		 2958 * - keep it tentative if it is a permanent address.
2959 * - otherwise, kill it.
2960 */
2961 in6_ifa_hold(ifp);
cc411d0b 2962 addrconf_dad_stop(ifp, 0);
6732bade 2963 return;
3c21edbd 2964 }
95c385b4
NH		 2965
2966 /*
2967 * Optimistic nodes can start receiving
2968 * Frames right away
2969 */
e21e8467 2970 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2971 ip6_ins_rt(ifp->rt);
2972
6732bade 2973 addrconf_dad_kick(ifp);
1da177e4 2974out:
622ccdf1 2975 spin_unlock(&ifp->lock);
1da177e4
LT		 2976 read_unlock_bh(&idev->lock);
2977}
2978
2979static void addrconf_dad_timer(unsigned long data)
2980{
2981 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2982 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2983 struct in6_addr mcaddr;
2984
f2344a13
HX		 2985 if (!ifp->probes && addrconf_dad_end(ifp))
2986 goto out;
2987
122e4519 2988 read_lock(&idev->lock);
2989 if (idev->dead || !(idev->if_flags & IF_READY)) {
2990 read_unlock(&idev->lock);
1da177e4
LT		 2991 goto out;
2992 }
21809faf 2993
2994 spin_lock(&ifp->lock);
622ccdf1
HX		 2995 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2996 spin_unlock(&ifp->lock);
2997 read_unlock(&idev->lock);
2998 goto out;
2999 }
3000
1da177e4
LT		 3001 if (ifp->probes == 0) {
3002 /*
3003 * DAD was successful
3004 */
3005
cc411d0b 3006 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3007 spin_unlock(&ifp->lock);
122e4519 3008 read_unlock(&idev->lock);
1da177e4
LT		 3009
3010 addrconf_dad_completed(ifp);
3011
3012 goto out;
3013 }
3014
3015 ifp->probes--;
3016 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3017 spin_unlock(&ifp->lock);
122e4519 3018 read_unlock(&idev->lock);
1da177e4
LT		 3019
3020 /* send a neighbour solicitation for our addr */
1da177e4 3021 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3022 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3023out:
3024 in6_ifa_put(ifp);
3025}
3026
3027static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3028{
e21e8467 3029 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3030
3031 /*
3032 * Configure the address for reception. Now it is valid.
3033 */
3034
3035 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3036
026359bc
TA		 3037 /* If added prefix is link local and we are prepared to process
3038 router advertisements, start sending router solicitations.
1da177e4
LT		 3039 */
3040
026359bc
TA		 3041 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3042 ifp->idev->cnf.accept_ra == 2) &&
1da177e4
LT		 3043 ifp->idev->cnf.rtr_solicits > 0 &&
3044 (dev->flags&IFF_LOOPBACK) == 0 &&
3045 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3046 /*
3047 * If a host as already performed a random delay
3048 * [...] as part of DAD [...] there is no need
3049 * to delay again before sending the first RS
3050 */
f3ee4010 3051 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3052
3053 spin_lock_bh(&ifp->lock);
3054 ifp->probes = 1;
3055 ifp->idev->if_flags |= IF_RS_SENT;
3056 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3057 spin_unlock_bh(&ifp->lock);
3058 }
3059}
3060
e21e8467
SH		 3061static void addrconf_dad_run(struct inet6_dev *idev)
3062{
c5e33bdd
YH		 3063 struct inet6_ifaddr *ifp;
3064
3065 read_lock_bh(&idev->lock);
502a2ffd 3066 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3067 spin_lock(&ifp->lock);
f2344a13
HX		 3068 if (ifp->flags & IFA_F_TENTATIVE &&
3069 ifp->state == INET6_IFADDR_STATE_DAD)
3070 addrconf_dad_kick(ifp);
21809faf 3071 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3072 }
3073 read_unlock_bh(&idev->lock);
3074}
3075
1da177e4
LT		 3076#ifdef CONFIG_PROC_FS
3077struct if6_iter_state {
3c40090a 3078 struct seq_net_private p;
1da177e4 3079 int bucket;
1d578303 3080 int offset;
1da177e4
LT		 3081};
3082
1d578303 3083static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3084{
3085 struct inet6_ifaddr *ifa = NULL;
3086 struct if6_iter_state *state = seq->private;
1218854a 3087 struct net *net = seq_file_net(seq);
1d578303 3088 int p = 0;
1da177e4 3089
1d578303
MM		 3090 /* initial bucket if pos is 0 */
3091 if (pos == 0) {
3092 state->bucket = 0;
3093 state->offset = 0;
3094 }
3095
3096 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3097 struct hlist_node *n;
4f70ecca 3098 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303
MM		 3099 addr_lst) {
3100 /* sync with offset */
3101 if (p < state->offset) {
3102 p++;
3103 continue;
3104 }
3105 state->offset++;
c2e21293 3106 if (net_eq(dev_net(ifa->idev->dev), net))
3107 return ifa;
1d578303
MM		 3108 }
3109
3110 /* prepare for next bucket */
3111 state->offset = 0;
3112 p = 0;
1da177e4 3113 }
c2e21293 3114 return NULL;
1da177e4
LT		 3115}
3116
c2e21293 3117static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3118 struct inet6_ifaddr *ifa)
1da177e4
LT		 3119{
3120 struct if6_iter_state *state = seq->private;
1218854a 3121 struct net *net = seq_file_net(seq);
c2e21293 3122 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3123
1d578303
MM		 3124 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3125 state->offset++;
c2e21293 3126 if (net_eq(dev_net(ifa->idev->dev), net))
3127 return ifa;
1d578303 3128 }
3c40090a 3129
c2e21293 3130 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3131 state->offset = 0;
4f70ecca 3132 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3133 &inet6_addr_lst[state->bucket], addr_lst) {
1d578303 3134 state->offset++;
c2e21293 3135 if (net_eq(dev_net(ifa->idev->dev), net))
3136 return ifa;
3137 }
1da177e4 3138 }
3c40090a 3139
c2e21293 3140 return NULL;
1da177e4
LT		 3141}
3142
1da177e4 3143static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3144 __acquires(rcu_bh)
1da177e4 3145{
5c578aed 3146 rcu_read_lock_bh();
1d578303 3147 return if6_get_first(seq, *pos);
1da177e4
LT		 3148}
3149
3150static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3151{
3152 struct inet6_ifaddr *ifa;
3153
3154 ifa = if6_get_next(seq, v);
3155 ++*pos;
3156 return ifa;
3157}
3158
3159static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3160 __releases(rcu_bh)
1da177e4 3161{
5c578aed 3162 rcu_read_unlock_bh();
1da177e4
LT		 3163}
3164
3165static int if6_seq_show(struct seq_file *seq, void *v)
3166{
3167 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3168 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3169 &ifp->addr,
1da177e4
LT		 3170 ifp->idev->dev->ifindex,
3171 ifp->prefix_len,
3172 ifp->scope,
3173 ifp->flags,
3174 ifp->idev->dev->name);
3175 return 0;
3176}
3177
56b3d975 3178static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3179 .start = if6_seq_start,
3180 .next = if6_seq_next,
3181 .show = if6_seq_show,
3182 .stop = if6_seq_stop,
3183};
3184
3185static int if6_seq_open(struct inode *inode, struct file *file)
3186{
3c40090a
DL		 3187 return seq_open_net(inode, file, &if6_seq_ops,
3188 sizeof(struct if6_iter_state));
1da177e4
LT		 3189}
3190
9a32144e 3191static const struct file_operations if6_fops = {
1da177e4
LT		 3192 .owner = THIS_MODULE,
3193 .open = if6_seq_open,
3194 .read = seq_read,
3195 .llseek = seq_lseek,
3c40090a 3196 .release = seq_release_net,
1da177e4
LT		 3197};
3198
2c8c1e72 3199static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3200{
3c40090a 3201 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3202 return -ENOMEM;
3203 return 0;
3204}
3205
2c8c1e72 3206static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3207{
3208 proc_net_remove(net, "if_inet6");
3209}
3210
3211static struct pernet_operations if6_proc_net_ops = {
3212 .init = if6_proc_net_init,
3213 .exit = if6_proc_net_exit,
3214};
3215
3216int __init if6_proc_init(void)
3217{
3218 return register_pernet_subsys(&if6_proc_net_ops);
3219}
3220
1da177e4
LT		 3221void if6_proc_exit(void)
3222{
3c40090a 3223 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3224}
3225#endif /* CONFIG_PROC_FS */
3226
59fbb3a6 3227#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3228/* Check if address is a home address configured on any interface. */
b71d1d42 3229int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3230{
3231 int ret = 0;
c2e21293 3232 struct inet6_ifaddr *ifp = NULL;
3233 struct hlist_node *n;
3a88a81d 3234 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3235
5c578aed 3236 rcu_read_lock_bh();
4f70ecca 3237 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3238 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3239 continue;
caad295f 3240 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3241 (ifp->flags & IFA_F_HOMEADDRESS)) {
3242 ret = 1;
3243 break;
3244 }
3245 }
5c578aed 3246 rcu_read_unlock_bh();
3b9f9a1c
NT		 3247 return ret;
3248}
3249#endif
3250
1da177e4
LT		 3251/*
3252 * Periodic address status verification
3253 */
3254
3255static void addrconf_verify(unsigned long foo)
3256{
b2db7564 3257 unsigned long now, next, next_sec, next_sched;
1da177e4 3258 struct inet6_ifaddr *ifp;
c2e21293 3259 struct hlist_node *node;
1da177e4
LT		 3260 int i;
3261
5c578aed 3262 rcu_read_lock_bh();
3263 spin_lock(&addrconf_verify_lock);
1da177e4 3264 now = jiffies;
b2db7564 3265 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3266
3267 del_timer(&addr_chk_timer);
3268
bcdd553f 3269 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3270restart:
4f70ecca 3271 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3272 &inet6_addr_lst[i], addr_lst) {
1da177e4 3273 unsigned long age;
1da177e4
LT		 3274
3275 if (ifp->flags & IFA_F_PERMANENT)
3276 continue;
3277
3278 spin_lock(&ifp->lock);
b2db7564
YH		 3279 /* We try to batch several events at once. */
3280 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3281
8f27ebb9
YH		 3282 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3283 age >= ifp->valid_lft) {
1da177e4
LT		 3284 spin_unlock(&ifp->lock);
3285 in6_ifa_hold(ifp);
1da177e4
LT		 3286 ipv6_del_addr(ifp);
3287 goto restart;
8f27ebb9
YH		 3288 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3289 spin_unlock(&ifp->lock);
3290 continue;
1da177e4 3291 } else if (age >= ifp->prefered_lft) {
a1ed0526 3292 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3293 int deprecate = 0;
3294
3295 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3296 deprecate = 1;
3297 ifp->flags |= IFA_F_DEPRECATED;
3298 }
3299
3300 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3301 next = ifp->tstamp + ifp->valid_lft * HZ;
3302
3303 spin_unlock(&ifp->lock);
3304
3305 if (deprecate) {
3306 in6_ifa_hold(ifp);
1da177e4
LT		 3307
3308 ipv6_ifa_notify(0, ifp);
3309 in6_ifa_put(ifp);
3310 goto restart;
3311 }
3312#ifdef CONFIG_IPV6_PRIVACY
3313 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3314 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3315 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3316 ifp->idev->cnf.dad_transmits *
3317 ifp->idev->nd_parms->retrans_time / HZ;
3318
1da177e4
LT		 3319 if (age >= ifp->prefered_lft - regen_advance) {
3320 struct inet6_ifaddr *ifpub = ifp->ifpub;
3321 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3322 next = ifp->tstamp + ifp->prefered_lft * HZ;
3323 if (!ifp->regen_count && ifpub) {
3324 ifp->regen_count++;
3325 in6_ifa_hold(ifp);
3326 in6_ifa_hold(ifpub);
3327 spin_unlock(&ifp->lock);
5c578aed 3328
291d809b
HY		 3329 spin_lock(&ifpub->lock);
3330 ifpub->regen_count = 0;
3331 spin_unlock(&ifpub->lock);
1da177e4
LT		 3332 ipv6_create_tempaddr(ifpub, ifp);
3333 in6_ifa_put(ifpub);
3334 in6_ifa_put(ifp);
3335 goto restart;
3336 }
3337 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3338 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3339 spin_unlock(&ifp->lock);
3340#endif
3341 } else {
3342 /* ifp->prefered_lft <= ifp->valid_lft */
3343 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3344 next = ifp->tstamp + ifp->prefered_lft * HZ;
3345 spin_unlock(&ifp->lock);
3346 }
3347 }
1da177e4
LT		 3348 }
3349
b2db7564
YH		 3350 next_sec = round_jiffies_up(next);
3351 next_sched = next;
3352
3353 /* If rounded timeout is accurate enough, accept it. */
3354 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3355 next_sched = next_sec;
3356
3357 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3358 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3359 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3360
3361 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3362 now, next, next_sec, next_sched));
3363
3364 addr_chk_timer.expires = next_sched;
1da177e4 3365 add_timer(&addr_chk_timer);
5c578aed 3366 spin_unlock(&addrconf_verify_lock);
3367 rcu_read_unlock_bh();
1da177e4
LT		 3368}
3369
461d8837
TG		 3370static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3371{
3372 struct in6_addr *pfx = NULL;
3373
3374 if (addr)
3375 pfx = nla_data(addr);
3376
3377 if (local) {
3378 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3379 pfx = NULL;
3380 else
3381 pfx = nla_data(local);
3382 }
3383
3384 return pfx;
3385}
3386
ef7c79ed 3387static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3388 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3389 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3390 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3391};
3392
1da177e4
LT		 3393static int
3394inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3395{
3b1e0a65 3396 struct net *net = sock_net(skb->sk);
b933f716
TG		 3397 struct ifaddrmsg *ifm;
3398 struct nlattr *tb[IFA_MAX+1];
1da177e4 3399 struct in6_addr *pfx;
b933f716 3400 int err;
1da177e4 3401
b933f716
TG		 3402 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3403 if (err < 0)
3404 return err;
3405
3406 ifm = nlmsg_data(nlh);
3407 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3408 if (pfx == NULL)
3409 return -EINVAL;
3410
af284937 3411 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3412}
3413
55ebaef1
NT		 3414static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3415 u32 prefered_lft, u32 valid_lft)
081bba5b 3416{
6f704992
YH		 3417 u32 flags;
3418 clock_t expires;
4bed72e4 3419 unsigned long timeout;
46d48046 3420
081bba5b
NT		 3421 if (!valid_lft || (prefered_lft > valid_lft))
3422 return -EINVAL;
3423
4bed72e4
YH		 3424 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3425 if (addrconf_finite_timeout(timeout)) {
3426 expires = jiffies_to_clock_t(timeout * HZ);
3427 valid_lft = timeout;
6f704992 3428 flags = RTF_EXPIRES;
4bed72e4
YH		 3429 } else {
3430 expires = 0;
3431 flags = 0;
3432 ifa_flags |= IFA_F_PERMANENT;
6f704992 3433 }
081bba5b 3434
4bed72e4
YH		 3435 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3436 if (addrconf_finite_timeout(timeout)) {
3437 if (timeout == 0)
3438 ifa_flags |= IFA_F_DEPRECATED;
3439 prefered_lft = timeout;
3440 }
081bba5b
NT		 3441
3442 spin_lock_bh(&ifp->lock);
3b9f9a1c 3443 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3444 ifp->tstamp = jiffies;
3445 ifp->valid_lft = valid_lft;
3446 ifp->prefered_lft = prefered_lft;
3447
3448 spin_unlock_bh(&ifp->lock);
3449 if (!(ifp->flags&IFA_F_TENTATIVE))
3450 ipv6_ifa_notify(0, ifp);
081bba5b 3451
46d48046 3452 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3453 expires, flags);
081bba5b
NT		 3454 addrconf_verify(0);
3455
3456 return 0;
3457}
3458
1da177e4
LT		 3459static int
3460inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3461{
3b1e0a65 3462 struct net *net = sock_net(skb->sk);
461d8837
TG		 3463 struct ifaddrmsg *ifm;
3464 struct nlattr *tb[IFA_MAX+1];
1da177e4 3465 struct in6_addr *pfx;
7198f8ce
TG		 3466 struct inet6_ifaddr *ifa;
3467 struct net_device *dev;
55ebaef1
NT		 3468 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3469 u8 ifa_flags;
461d8837 3470 int err;
1da177e4 3471
461d8837
TG		 3472 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3473 if (err < 0)
3474 return err;
3475
3476 ifm = nlmsg_data(nlh);
3477 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3478 if (pfx == NULL)
3479 return -EINVAL;
3480
461d8837 3481 if (tb[IFA_CACHEINFO]) {
0778769d 3482 struct ifa_cacheinfo *ci;
461d8837
TG		 3483
3484 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3485 valid_lft = ci->ifa_valid;
461d8837
TG		 3486 preferred_lft = ci->ifa_prefered;
3487 } else {
3488 preferred_lft = INFINITY_LIFE_TIME;
3489 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3490 }
3491
af284937 3492 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3493 if (dev == NULL)
3494 return -ENODEV;
3495
55ebaef1 3496 /* We ignore other flags so far. */
3b9f9a1c 3497 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3498
1cab3da6 3499 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3500 if (ifa == NULL) {
3501 /*
3502 * It would be best to check for !NLM_F_CREATE here but
3503 * userspace alreay relies on not having to provide this.
3504 */
af284937
DL		 3505 return inet6_addr_add(net, ifm->ifa_index, pfx,
3506 ifm->ifa_prefixlen, ifa_flags,
3507 preferred_lft, valid_lft);
081bba5b
NT		 3508 }
3509
7198f8ce
TG		 3510 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3511 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3512 err = -EEXIST;
3513 else
55ebaef1 3514 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3515
3516 in6_ifa_put(ifa);
3517
3518 return err;
1da177e4
LT		 3519}
3520
101bb229
TG		 3521static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3522 u8 scope, int ifindex)
3523{
3524 struct ifaddrmsg *ifm;
3525
3526 ifm = nlmsg_data(nlh);
3527 ifm->ifa_family = AF_INET6;
3528 ifm->ifa_prefixlen = prefixlen;
3529 ifm->ifa_flags = flags;
3530 ifm->ifa_scope = scope;
3531 ifm->ifa_index = ifindex;
3532}
3533
85486af0
TG		 3534static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3535 unsigned long tstamp, u32 preferred, u32 valid)
3536{
3537 struct ifa_cacheinfo ci;
3538
18a31e1e
TG		 3539 ci.cstamp = cstamp_delta(cstamp);
3540 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3541 ci.ifa_prefered = preferred;
3542 ci.ifa_valid = valid;
3543
3544 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3545}
3546
101bb229
TG		 3547static inline int rt_scope(int ifa_scope)
3548{
3549 if (ifa_scope & IFA_HOST)
3550 return RT_SCOPE_HOST;
3551 else if (ifa_scope & IFA_LINK)
3552 return RT_SCOPE_LINK;
3553 else if (ifa_scope & IFA_SITE)
3554 return RT_SCOPE_SITE;
3555 else
3556 return RT_SCOPE_UNIVERSE;
3557}
3558
0ab6803b
TG		 3559static inline int inet6_ifaddr_msgsize(void)
3560{
339bf98f
TG		 3561 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3562 + nla_total_size(16) /* IFA_ADDRESS */
3563 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3564}
c5396a31 3565
1da177e4 3566static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3567 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3568{
1da177e4 3569 struct nlmsghdr *nlh;
85486af0 3570 u32 preferred, valid;
1da177e4 3571
0ab6803b
TG		 3572 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3573 if (nlh == NULL)
26932566 3574 return -EMSGSIZE;
0ab6803b 3575
101bb229
TG		 3576 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3577 ifa->idev->dev->ifindex);
3578
1da177e4 3579 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3580 preferred = ifa->prefered_lft;
3581 valid = ifa->valid_lft;
3582 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3583 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3584 if (preferred > tval)
3585 preferred -= tval;
3586 else
3587 preferred = 0;
f56619fc
BH		 3588 if (valid != INFINITY_LIFE_TIME) {
3589 if (valid > tval)
3590 valid -= tval;
3591 else
3592 valid = 0;
3593 }
1da177e4
LT		 3594 }
3595 } else {
85486af0
TG		 3596 preferred = INFINITY_LIFE_TIME;
3597 valid = INFINITY_LIFE_TIME;
3598 }
3599
0ab6803b 3600 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3601 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3602 nlmsg_cancel(skb, nlh);
3603 return -EMSGSIZE;
3604 }
1da177e4 3605
0ab6803b 3606 return nlmsg_end(skb, nlh);
1da177e4
LT		 3607}
3608
3609static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3610 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3611{
1da177e4 3612 struct nlmsghdr *nlh;
101bb229
TG		 3613 u8 scope = RT_SCOPE_UNIVERSE;
3614 int ifindex = ifmca->idev->dev->ifindex;
3615
3616 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3617 scope = RT_SCOPE_SITE;
1da177e4 3618
0ab6803b
TG		 3619 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3620 if (nlh == NULL)
26932566 3621 return -EMSGSIZE;
85486af0 3622
0ab6803b
TG		 3623 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3624 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3625 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3626 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3627 nlmsg_cancel(skb, nlh);
3628 return -EMSGSIZE;
3629 }
85486af0 3630
0ab6803b 3631 return nlmsg_end(skb, nlh);
1da177e4
LT		 3632}
3633
3634static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3635 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3636{
1da177e4 3637 struct nlmsghdr *nlh;
101bb229
TG		 3638 u8 scope = RT_SCOPE_UNIVERSE;
3639 int ifindex = ifaca->aca_idev->dev->ifindex;
3640
3641 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3642 scope = RT_SCOPE_SITE;
1da177e4 3643
0ab6803b
TG		 3644 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3645 if (nlh == NULL)
26932566 3646 return -EMSGSIZE;
85486af0 3647
0ab6803b
TG		 3648 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3649 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3650 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3651 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3652 nlmsg_cancel(skb, nlh);
3653 return -EMSGSIZE;
3654 }
1da177e4 3655
0ab6803b 3656 return nlmsg_end(skb, nlh);
1da177e4
LT		 3657}
3658
e21e8467 3659enum addr_type_t {
1da177e4
LT		 3660 UNICAST_ADDR,
3661 MULTICAST_ADDR,
3662 ANYCAST_ADDR,
3663};
3664
234b27c3
ED		 3665/* called with rcu_read_lock() */
3666static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3667 struct netlink_callback *cb, enum addr_type_t type,
3668 int s_ip_idx, int *p_ip_idx)
3669{
234b27c3
ED		 3670 struct ifmcaddr6 *ifmca;
3671 struct ifacaddr6 *ifaca;
3672 int err = 1;
3673 int ip_idx = *p_ip_idx;
3674
3675 read_lock_bh(&idev->lock);
3676 switch (type) {
502a2ffd 3677 case UNICAST_ADDR: {
3678 struct inet6_ifaddr *ifa;
3679
234b27c3 3680 /* unicast address incl. temp addr */
502a2ffd 3681 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3682 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3683 continue;
3684 err = inet6_fill_ifaddr(skb, ifa,
3685 NETLINK_CB(cb->skb).pid,
3686 cb->nlh->nlmsg_seq,
3687 RTM_NEWADDR,
3688 NLM_F_MULTI);
3689 if (err <= 0)
3690 break;
3691 }
3692 break;
502a2ffd 3693 }
234b27c3
ED		 3694 case MULTICAST_ADDR:
3695 /* multicast address */
3696 for (ifmca = idev->mc_list; ifmca;
3697 ifmca = ifmca->next, ip_idx++) {
3698 if (ip_idx < s_ip_idx)
3699 continue;
3700 err = inet6_fill_ifmcaddr(skb, ifmca,
3701 NETLINK_CB(cb->skb).pid,
3702 cb->nlh->nlmsg_seq,
3703 RTM_GETMULTICAST,
3704 NLM_F_MULTI);
3705 if (err <= 0)
3706 break;
3707 }
3708 break;
3709 case ANYCAST_ADDR:
3710 /* anycast address */
3711 for (ifaca = idev->ac_list; ifaca;
3712 ifaca = ifaca->aca_next, ip_idx++) {
3713 if (ip_idx < s_ip_idx)
3714 continue;
3715 err = inet6_fill_ifacaddr(skb, ifaca,
3716 NETLINK_CB(cb->skb).pid,
3717 cb->nlh->nlmsg_seq,
3718 RTM_GETANYCAST,
3719 NLM_F_MULTI);
3720 if (err <= 0)
3721 break;
3722 }
3723 break;
3724 default:
3725 break;
3726 }
3727 read_unlock_bh(&idev->lock);
3728 *p_ip_idx = ip_idx;
3729 return err;
3730}
3731
1da177e4
LT		 3732static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3733 enum addr_type_t type)
3734{
234b27c3
ED		 3735 struct net *net = sock_net(skb->sk);
3736 int h, s_h;
1da177e4
LT		 3737 int idx, ip_idx;
3738 int s_idx, s_ip_idx;
1da177e4 3739 struct net_device *dev;
234b27c3
ED		 3740 struct inet6_dev *idev;
3741 struct hlist_head *head;
3742 struct hlist_node *node;
1ab1457c 3743
234b27c3
ED		 3744 s_h = cb->args[0];
3745 s_idx = idx = cb->args[1];
3746 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3747
234b27c3
ED		 3748 rcu_read_lock();
3749 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3750 idx = 0;
3751 head = &net->dev_index_head[h];
3752 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3753 if (idx < s_idx)
3754 goto cont;
4b97efdf 3755 if (h > s_h || idx > s_idx)
234b27c3
ED		 3756 s_ip_idx = 0;
3757 ip_idx = 0;
e21e8467
SH		 3758 idev = __in6_dev_get(dev);
3759 if (!idev)
234b27c3
ED		 3760 goto cont;
3761
3762 if (in6_dump_addrs(idev, skb, cb, type,
3763 s_ip_idx, &ip_idx) <= 0)
3764 goto done;
7562f876 3765cont:
234b27c3
ED		 3766 idx++;
3767 }
1da177e4 3768 }
234b27c3
ED		 3769done:
3770 rcu_read_unlock();
3771 cb->args[0] = h;
3772 cb->args[1] = idx;
3773 cb->args[2] = ip_idx;
3774
1da177e4
LT		 3775 return skb->len;
3776}
3777
3778static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3779{
3780 enum addr_type_t type = UNICAST_ADDR;
b854272b 3781
1da177e4
LT		 3782 return inet6_dump_addr(skb, cb, type);
3783}
3784
3785static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3786{
3787 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3788
1da177e4
LT		 3789 return inet6_dump_addr(skb, cb, type);
3790}
3791
3792
3793static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3794{
3795 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3796
1da177e4
LT		 3797 return inet6_dump_addr(skb, cb, type);
3798}
3799
8e5e8f30 3800static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3801 void *arg)
6c223828 3802{
3b1e0a65 3803 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3804 struct ifaddrmsg *ifm;
3805 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3806 struct in6_addr *addr = NULL;
3807 struct net_device *dev = NULL;
3808 struct inet6_ifaddr *ifa;
3809 struct sk_buff *skb;
6c223828
NT		 3810 int err;
3811
1b29fc2c
TG		 3812 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3813 if (err < 0)
3814 goto errout;
3815
3816 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3817 if (addr == NULL) {
3818 err = -EINVAL;
3819 goto errout;
6c223828 3820 }
6c223828 3821
1b29fc2c 3822 ifm = nlmsg_data(nlh);
6c223828 3823 if (ifm->ifa_index)
6fda7350 3824 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3825
e21e8467
SH		 3826 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3827 if (!ifa) {
1b29fc2c
TG		 3828 err = -EADDRNOTAVAIL;
3829 goto errout;
3830 }
6c223828 3831
e21e8467
SH		 3832 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3833 if (!skb) {
6c223828 3834 err = -ENOBUFS;
1b29fc2c 3835 goto errout_ifa;
6c223828
NT		 3836 }
3837
6c223828
NT		 3838 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3839 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3840 if (err < 0) {
3841 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3842 WARN_ON(err == -EMSGSIZE);
3843 kfree_skb(skb);
3844 goto errout_ifa;
3845 }
6fda7350 3846 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3847errout_ifa:
6c223828 3848 in6_ifa_put(ifa);
1b29fc2c 3849errout:
6c223828 3850 return err;
6c223828
NT		 3851}
3852
1da177e4
LT		 3853static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3854{
3855 struct sk_buff *skb;
c346dca1 3856 struct net *net = dev_net(ifa->idev->dev);
5d620266 3857 int err = -ENOBUFS;
1da177e4 3858
0ab6803b 3859 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3860 if (skb == NULL)
3861 goto errout;
3862
3863 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3864 if (err < 0) {
3865 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3866 WARN_ON(err == -EMSGSIZE);
3867 kfree_skb(skb);
3868 goto errout;
3869 }
1ce85fe4
PNA		 3870 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3871 return;
5d620266
TG		 3872errout:
3873 if (err < 0)
6fda7350 3874 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3875}
3876
b6f99a21 3877static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3878 __s32 *array, int bytes)
3879{
04561c1f
TG		 3880 BUG_ON(bytes < (DEVCONF_MAX * 4));
3881
1da177e4
LT		 3882 memset(array, 0, bytes);
3883 array[DEVCONF_FORWARDING] = cnf->forwarding;
3884 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3885 array[DEVCONF_MTU6] = cnf->mtu6;
3886 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3887 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3888 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3889 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3890 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3891 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3892 jiffies_to_msecs(cnf->rtr_solicit_interval);
3893 array[DEVCONF_RTR_SOLICIT_DELAY] =
3894 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3895 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3896#ifdef CONFIG_IPV6_PRIVACY
3897 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3898 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3899 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3900 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3901 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3902#endif
3903 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3904 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3905 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3906#ifdef CONFIG_IPV6_ROUTER_PREF
3907 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3908 array[DEVCONF_RTR_PROBE_INTERVAL] =
3909 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3910#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3911 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3912#endif
930d6ff2 3913#endif
fbea49e1 3914 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3915 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3916#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3917 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3918#endif
7bc570c8
YH		 3919#ifdef CONFIG_IPV6_MROUTE
3920 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3921#endif
778d80be 3922 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3923 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3924 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3925}
3926
b382b191
TG		 3927static inline size_t inet6_ifla6_size(void)
3928{
3929 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3930 + nla_total_size(sizeof(struct ifla_cacheinfo))
3931 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3932 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3933 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3934}
3935
339bf98f
TG		 3936static inline size_t inet6_if_nlmsg_size(void)
3937{
3938 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3939 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3940 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3941 + nla_total_size(4) /* IFLA_MTU */
3942 + nla_total_size(4) /* IFLA_LINK */
b382b191 3943 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3944}
c5396a31 3945
be281e55 3946static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 3947 int items, int bytes)
7f7d9a6b
HX		 3948{
3949 int i;
3950 int pad = bytes - sizeof(u64) * items;
3951 BUG_ON(pad < 0);
3952
3953 /* Use put_unaligned() because stats may not be aligned for u64. */
3954 put_unaligned(items, &stats[0]);
3955 for (i = 1; i < items; i++)
be281e55 3956 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 3957
3958 memset(&stats[items], 0, pad);
3959}
3960
4ce3c183
ED		 3961static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3962 int items, int bytes, size_t syncpoff)
3963{
3964 int i;
3965 int pad = bytes - sizeof(u64) * items;
3966 BUG_ON(pad < 0);
3967
3968 /* Use put_unaligned() because stats may not be aligned for u64. */
3969 put_unaligned(items, &stats[0]);
3970 for (i = 1; i < items; i++)
3971 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3972
3973 memset(&stats[items], 0, pad);
3974}
3975
7f7d9a6b
HX		 3976static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3977 int bytes)
3978{
e21e8467 3979 switch (attrtype) {
7f7d9a6b 3980 case IFLA_INET6_STATS:
4ce3c183
ED		 3981 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3982 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3983 break;
3984 case IFLA_INET6_ICMP6STATS:
be281e55 3985 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3986 break;
3987 }
3988}
3989
b382b191
TG		 3990static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3991{
3992 struct nlattr *nla;
3993 struct ifla_cacheinfo ci;
3994
c78679e8
DM		 3995 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3996 goto nla_put_failure;
b382b191 3997 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 3998 ci.tstamp = cstamp_delta(idev->tstamp);
3999 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4000 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 4001 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4002 goto nla_put_failure;
b382b191
TG		 4003 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4004 if (nla == NULL)
4005 goto nla_put_failure;
4006 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4007
4008 /* XXX - MC not implemented */
4009
4010 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4011 if (nla == NULL)
4012 goto nla_put_failure;
4013 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4014
4015 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4016 if (nla == NULL)
4017 goto nla_put_failure;
4018 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4019
4020 return 0;
4021
4022nla_put_failure:
4023 return -EMSGSIZE;
4024}
4025
4026static size_t inet6_get_link_af_size(const struct net_device *dev)
4027{
4028 if (!__in6_dev_get(dev))
4029 return 0;
4030
4031 return inet6_ifla6_size();
4032}
4033
4034static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4035{
4036 struct inet6_dev *idev = __in6_dev_get(dev);
4037
4038 if (!idev)
4039 return -ENODATA;
4040
4041 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4042 return -EMSGSIZE;
4043
4044 return 0;
4045}
4046
1ab1457c 4047static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 4048 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 4049{
04561c1f 4050 struct net_device *dev = idev->dev;
04561c1f
TG		 4051 struct ifinfomsg *hdr;
4052 struct nlmsghdr *nlh;
4053 void *protoinfo;
04561c1f
TG		 4054
4055 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4056 if (nlh == NULL)
26932566 4057 return -EMSGSIZE;
04561c1f
TG		 4058
4059 hdr = nlmsg_data(nlh);
4060 hdr->ifi_family = AF_INET6;
4061 hdr->__ifi_pad = 0;
4062 hdr->ifi_type = dev->type;
4063 hdr->ifi_index = dev->ifindex;
4064 hdr->ifi_flags = dev_get_flags(dev);
4065 hdr->ifi_change = 0;
4066
c78679e8
DM		 4067 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4068 (dev->addr_len &&
4069 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4070 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4071 (dev->ifindex != dev->iflink &&
4072 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4073 goto nla_put_failure;
04561c1f
TG		 4074 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4075 if (protoinfo == NULL)
4076 goto nla_put_failure;
1da177e4 4077
b382b191 4078 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4079 goto nla_put_failure;
1da177e4 4080
04561c1f
TG		 4081 nla_nest_end(skb, protoinfo);
4082 return nlmsg_end(skb, nlh);
1da177e4 4083
04561c1f 4084nla_put_failure:
26932566
PM		 4085 nlmsg_cancel(skb, nlh);
4086 return -EMSGSIZE;
1da177e4
LT		 4087}
4088
4089static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4090{
3b1e0a65 4091 struct net *net = sock_net(skb->sk);
84d2697d 4092 int h, s_h;
434a8a58 4093 int idx = 0, s_idx;
1da177e4
LT		 4094 struct net_device *dev;
4095 struct inet6_dev *idev;
84d2697d
ED		 4096 struct hlist_head *head;
4097 struct hlist_node *node;
1da177e4 4098
84d2697d
ED		 4099 s_h = cb->args[0];
4100 s_idx = cb->args[1];
4101
4102 rcu_read_lock();
4103 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4104 idx = 0;
4105 head = &net->dev_index_head[h];
4106 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4107 if (idx < s_idx)
4108 goto cont;
4109 idev = __in6_dev_get(dev);
4110 if (!idev)
4111 goto cont;
4112 if (inet6_fill_ifinfo(skb, idev,
4113 NETLINK_CB(cb->skb).pid,
4114 cb->nlh->nlmsg_seq,
4115 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4116 goto out;
7562f876 4117cont:
84d2697d
ED		 4118 idx++;
4119 }
1da177e4 4120 }
84d2697d
ED		 4121out:
4122 rcu_read_unlock();
4123 cb->args[1] = idx;
4124 cb->args[0] = h;
1da177e4
LT		 4125
4126 return skb->len;
4127}
4128
4129void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4130{
4131 struct sk_buff *skb;
c346dca1 4132 struct net *net = dev_net(idev->dev);
8d7a76c9 4133 int err = -ENOBUFS;
1ab1457c 4134
339bf98f 4135 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4136 if (skb == NULL)
4137 goto errout;
4138
4139 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4140 if (err < 0) {
4141 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4142 WARN_ON(err == -EMSGSIZE);
4143 kfree_skb(skb);
4144 goto errout;
4145 }
5f75a104 4146 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4147 return;
8d7a76c9
TG		 4148errout:
4149 if (err < 0)
5f75a104 4150 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4151}
4152
339bf98f
TG		 4153static inline size_t inet6_prefix_nlmsg_size(void)
4154{
4155 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4156 + nla_total_size(sizeof(struct in6_addr))
4157 + nla_total_size(sizeof(struct prefix_cacheinfo));
4158}
c5396a31 4159
1da177e4 4160static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4161 struct prefix_info *pinfo, u32 pid, u32 seq,
4162 int event, unsigned int flags)
1da177e4 4163{
6051e2f4
TG		 4164 struct prefixmsg *pmsg;
4165 struct nlmsghdr *nlh;
1da177e4
LT		 4166 struct prefix_cacheinfo ci;
4167
6051e2f4
TG		 4168 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4169 if (nlh == NULL)
26932566 4170 return -EMSGSIZE;
6051e2f4
TG		 4171
4172 pmsg = nlmsg_data(nlh);
1da177e4 4173 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4174 pmsg->prefix_pad1 = 0;
4175 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4176 pmsg->prefix_ifindex = idev->dev->ifindex;
4177 pmsg->prefix_len = pinfo->prefix_len;
4178 pmsg->prefix_type = pinfo->type;
8a47077a 4179 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4180 pmsg->prefix_flags = 0;
4181 if (pinfo->onlink)
4182 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4183 if (pinfo->autoconf)
4184 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4185
c78679e8
DM		 4186 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4187 goto nla_put_failure;
1da177e4
LT		 4188 ci.preferred_time = ntohl(pinfo->prefered);
4189 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4190 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4191 goto nla_put_failure;
6051e2f4 4192 return nlmsg_end(skb, nlh);
1da177e4 4193
6051e2f4 4194nla_put_failure:
26932566
PM		 4195 nlmsg_cancel(skb, nlh);
4196 return -EMSGSIZE;
1da177e4
LT		 4197}
4198
1ab1457c 4199static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4200 struct prefix_info *pinfo)
4201{
4202 struct sk_buff *skb;
c346dca1 4203 struct net *net = dev_net(idev->dev);
8c384bfa 4204 int err = -ENOBUFS;
1da177e4 4205
339bf98f 4206 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4207 if (skb == NULL)
4208 goto errout;
4209
4210 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4211 if (err < 0) {
4212 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4213 WARN_ON(err == -EMSGSIZE);
4214 kfree_skb(skb);
4215 goto errout;
4216 }
1ce85fe4
PNA		 4217 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4218 return;
8c384bfa
TG		 4219errout:
4220 if (err < 0)
6fda7350 4221 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4222}
4223
1da177e4
LT		 4224static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4225{
4226 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4227
4228 switch (event) {
4229 case RTM_NEWADDR:
95c385b4
NH		 4230 /*
4231 * If the address was optimistic
4232 * we inserted the route at the start of
4233 * our DAD process, so we don't need
4234 * to do it again
4235 */
4236 if (!(ifp->rt->rt6i_node))
4237 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4238 if (ifp->idev->cnf.forwarding)
4239 addrconf_join_anycast(ifp);
4240 break;
4241 case RTM_DELADDR:
4242 if (ifp->idev->cnf.forwarding)
4243 addrconf_leave_anycast(ifp);
4244 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4245 dst_hold(&ifp->rt->dst);
93fa159a 4246
73a8bd74 4247 if (ip6_del_rt(ifp->rt))
d8d1f30b 4248 dst_free(&ifp->rt->dst);
1da177e4
LT		 4249 break;
4250 }
4251}
4252
4253static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4254{
8814c4b5 4255 rcu_read_lock_bh();
1da177e4
LT		 4256 if (likely(ifp->idev->dead == 0))
4257 __ipv6_ifa_notify(event, ifp);
8814c4b5 4258 rcu_read_unlock_bh();
1da177e4
LT		 4259}
4260
4261#ifdef CONFIG_SYSCTL
4262
4263static
8d65af78 4264int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4265 void __user *buffer, size_t *lenp, loff_t *ppos)
4266{
4267 int *valp = ctl->data;
4268 int val = *valp;
88af182e 4269 loff_t pos = *ppos;
013d97e9 4270 ctl_table lctl;
1da177e4
LT		 4271 int ret;
4272
013d97e9
FR		 4273 /*
4274 * ctl->data points to idev->cnf.forwarding, we should
4275 * not modify it until we get the rtnl lock.
4276 */
4277 lctl = *ctl;
4278 lctl.data = &val;
4279
4280 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4281
c8fecf22 4282 if (write)
b325fddb 4283 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4284 if (ret)
4285 *ppos = pos;
1ab1457c 4286 return ret;
1da177e4
LT		 4287}
4288
56d417b1
BH		 4289static void dev_disable_change(struct inet6_dev *idev)
4290{
4291 if (!idev || !idev->dev)
4292 return;
4293
4294 if (idev->cnf.disable_ipv6)
4295 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4296 else
4297 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4298}
4299
4300static void addrconf_disable_change(struct net *net, __s32 newf)
4301{
4302 struct net_device *dev;
4303 struct inet6_dev *idev;
4304
c6d14c84
ED		 4305 rcu_read_lock();
4306 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4307 idev = __in6_dev_get(dev);
4308 if (idev) {
4309 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4310 idev->cnf.disable_ipv6 = newf;
4311 if (changed)
4312 dev_disable_change(idev);
4313 }
56d417b1 4314 }
c6d14c84 4315 rcu_read_unlock();
56d417b1
BH		 4316}
4317
013d97e9 4318static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4319{
4320 struct net *net;
013d97e9
FR		 4321 int old;
4322
4323 if (!rtnl_trylock())
4324 return restart_syscall();
56d417b1
BH		 4325
4326 net = (struct net *)table->extra2;
013d97e9
FR		 4327 old = *p;
4328 *p = newf;
56d417b1 4329
013d97e9
FR		 4330 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4331 rtnl_unlock();
56d417b1 4332 return 0;
88af182e 4333 }
56d417b1
BH		 4334
4335 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4336 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4337 addrconf_disable_change(net, newf);
013d97e9 4338 } else if ((!newf) ^ (!old))
56d417b1
BH		 4339 dev_disable_change((struct inet6_dev *)table->extra1);
4340
4341 rtnl_unlock();
4342 return 0;
4343}
4344
4345static
8d65af78 4346int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4347 void __user *buffer, size_t *lenp, loff_t *ppos)
4348{
4349 int *valp = ctl->data;
4350 int val = *valp;
88af182e 4351 loff_t pos = *ppos;
013d97e9 4352 ctl_table lctl;
56d417b1
BH		 4353 int ret;
4354
013d97e9
FR		 4355 /*
4356 * ctl->data points to idev->cnf.disable_ipv6, we should
4357 * not modify it until we get the rtnl lock.
4358 */
4359 lctl = *ctl;
4360 lctl.data = &val;
4361
4362 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4363
4364 if (write)
4365 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4366 if (ret)
4367 *ppos = pos;
56d417b1
BH		 4368 return ret;
4369}
4370
1da177e4
LT		 4371static struct addrconf_sysctl_table
4372{
4373 struct ctl_table_header *sysctl_header;
f6a07b29 4374 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4375} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4376 .sysctl_header = NULL,
4377 .addrconf_vars = {
1ab1457c 4378 {
e21e8467
SH		 4379 .procname = "forwarding",
4380 .data = &ipv6_devconf.forwarding,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4384 },
4385 {
e21e8467
SH		 4386 .procname = "hop_limit",
4387 .data = &ipv6_devconf.hop_limit,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
1da177e4
LT		 4391 },
4392 {
e21e8467
SH		 4393 .procname = "mtu",
4394 .data = &ipv6_devconf.mtu6,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
1da177e4
LT		 4398 },
4399 {
e21e8467
SH		 4400 .procname = "accept_ra",
4401 .data = &ipv6_devconf.accept_ra,
4402 .maxlen = sizeof(int),
4403 .mode = 0644,
4404 .proc_handler = proc_dointvec,
1da177e4
LT		 4405 },
4406 {
e21e8467
SH		 4407 .procname = "accept_redirects",
4408 .data = &ipv6_devconf.accept_redirects,
4409 .maxlen = sizeof(int),
4410 .mode = 0644,
4411 .proc_handler = proc_dointvec,
1da177e4
LT		 4412 },
4413 {
e21e8467
SH		 4414 .procname = "autoconf",
4415 .data = &ipv6_devconf.autoconf,
4416 .maxlen = sizeof(int),
4417 .mode = 0644,
4418 .proc_handler = proc_dointvec,
1da177e4
LT		 4419 },
4420 {
e21e8467
SH		 4421 .procname = "dad_transmits",
4422 .data = &ipv6_devconf.dad_transmits,
4423 .maxlen = sizeof(int),
4424 .mode = 0644,
4425 .proc_handler = proc_dointvec,
1da177e4
LT		 4426 },
4427 {
e21e8467
SH		 4428 .procname = "router_solicitations",
4429 .data = &ipv6_devconf.rtr_solicits,
4430 .maxlen = sizeof(int),
4431 .mode = 0644,
4432 .proc_handler = proc_dointvec,
1da177e4
LT		 4433 },
4434 {
e21e8467
SH		 4435 .procname = "router_solicitation_interval",
4436 .data = &ipv6_devconf.rtr_solicit_interval,
4437 .maxlen = sizeof(int),
4438 .mode = 0644,
4439 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4440 },
4441 {
e21e8467
SH		 4442 .procname = "router_solicitation_delay",
4443 .data = &ipv6_devconf.rtr_solicit_delay,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4447 },
4448 {
e21e8467
SH		 4449 .procname = "force_mld_version",
4450 .data = &ipv6_devconf.force_mld_version,
4451 .maxlen = sizeof(int),
4452 .mode = 0644,
4453 .proc_handler = proc_dointvec,
1da177e4
LT		 4454 },
4455#ifdef CONFIG_IPV6_PRIVACY
4456 {
e21e8467
SH		 4457 .procname = "use_tempaddr",
4458 .data = &ipv6_devconf.use_tempaddr,
4459 .maxlen = sizeof(int),
4460 .mode = 0644,
4461 .proc_handler = proc_dointvec,
1da177e4
LT		 4462 },
4463 {
e21e8467
SH		 4464 .procname = "temp_valid_lft",
4465 .data = &ipv6_devconf.temp_valid_lft,
4466 .maxlen = sizeof(int),
4467 .mode = 0644,
4468 .proc_handler = proc_dointvec,
1da177e4
LT		 4469 },
4470 {
e21e8467
SH		 4471 .procname = "temp_prefered_lft",
4472 .data = &ipv6_devconf.temp_prefered_lft,
4473 .maxlen = sizeof(int),
4474 .mode = 0644,
4475 .proc_handler = proc_dointvec,
1da177e4
LT		 4476 },
4477 {
e21e8467
SH		 4478 .procname = "regen_max_retry",
4479 .data = &ipv6_devconf.regen_max_retry,
4480 .maxlen = sizeof(int),
4481 .mode = 0644,
4482 .proc_handler = proc_dointvec,
1da177e4
LT		 4483 },
4484 {
e21e8467
SH		 4485 .procname = "max_desync_factor",
4486 .data = &ipv6_devconf.max_desync_factor,
4487 .maxlen = sizeof(int),
4488 .mode = 0644,
4489 .proc_handler = proc_dointvec,
1da177e4
LT		 4490 },
4491#endif
4492 {
e21e8467
SH		 4493 .procname = "max_addresses",
4494 .data = &ipv6_devconf.max_addresses,
4495 .maxlen = sizeof(int),
4496 .mode = 0644,
4497 .proc_handler = proc_dointvec,
1da177e4 4498 },
65f5c7c1 4499 {
e21e8467
SH		 4500 .procname = "accept_ra_defrtr",
4501 .data = &ipv6_devconf.accept_ra_defrtr,
4502 .maxlen = sizeof(int),
4503 .mode = 0644,
4504 .proc_handler = proc_dointvec,
65f5c7c1 4505 },
c4fd30eb 4506 {
e21e8467
SH		 4507 .procname = "accept_ra_pinfo",
4508 .data = &ipv6_devconf.accept_ra_pinfo,
4509 .maxlen = sizeof(int),
4510 .mode = 0644,
4511 .proc_handler = proc_dointvec,
c4fd30eb 4512 },
930d6ff2
YH		 4513#ifdef CONFIG_IPV6_ROUTER_PREF
4514 {
e21e8467
SH		 4515 .procname = "accept_ra_rtr_pref",
4516 .data = &ipv6_devconf.accept_ra_rtr_pref,
4517 .maxlen = sizeof(int),
4518 .mode = 0644,
4519 .proc_handler = proc_dointvec,
930d6ff2 4520 },
52e16356 4521 {
e21e8467
SH		 4522 .procname = "router_probe_interval",
4523 .data = &ipv6_devconf.rtr_probe_interval,
4524 .maxlen = sizeof(int),
4525 .mode = 0644,
4526 .proc_handler = proc_dointvec_jiffies,
52e16356 4527 },
fa03ef38 4528#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4529 {
e21e8467
SH		 4530 .procname = "accept_ra_rt_info_max_plen",
4531 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4532 .maxlen = sizeof(int),
4533 .mode = 0644,
4534 .proc_handler = proc_dointvec,
09c884d4
YH		 4535 },
4536#endif
930d6ff2 4537#endif
fbea49e1 4538 {
e21e8467
SH		 4539 .procname = "proxy_ndp",
4540 .data = &ipv6_devconf.proxy_ndp,
4541 .maxlen = sizeof(int),
4542 .mode = 0644,
4543 .proc_handler = proc_dointvec,
fbea49e1 4544 },
0bcbc926 4545 {
e21e8467
SH		 4546 .procname = "accept_source_route",
4547 .data = &ipv6_devconf.accept_source_route,
4548 .maxlen = sizeof(int),
4549 .mode = 0644,
4550 .proc_handler = proc_dointvec,
0bcbc926 4551 },
95c385b4
NH		 4552#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4553 {
e21e8467
SH		 4554 .procname = "optimistic_dad",
4555 .data = &ipv6_devconf.optimistic_dad,
4556 .maxlen = sizeof(int),
4557 .mode = 0644,
4558 .proc_handler = proc_dointvec,
95c385b4
NH		 4559
4560 },
7bc570c8
YH		 4561#endif
4562#ifdef CONFIG_IPV6_MROUTE
4563 {
e21e8467
SH		 4564 .procname = "mc_forwarding",
4565 .data = &ipv6_devconf.mc_forwarding,
4566 .maxlen = sizeof(int),
4567 .mode = 0444,
4568 .proc_handler = proc_dointvec,
7bc570c8 4569 },
95c385b4 4570#endif
778d80be 4571 {
e21e8467
SH		 4572 .procname = "disable_ipv6",
4573 .data = &ipv6_devconf.disable_ipv6,
4574 .maxlen = sizeof(int),
4575 .mode = 0644,
4576 .proc_handler = addrconf_sysctl_disable,
778d80be 4577 },
1b34be74 4578 {
e21e8467
SH		 4579 .procname = "accept_dad",
4580 .data = &ipv6_devconf.accept_dad,
4581 .maxlen = sizeof(int),
4582 .mode = 0644,
4583 .proc_handler = proc_dointvec,
1b34be74 4584 },
f7734fdf 4585 {
f7734fdf
OP		 4586 .procname = "force_tllao",
4587 .data = &ipv6_devconf.force_tllao,
4588 .maxlen = sizeof(int),
4589 .mode = 0644,
4590 .proc_handler = proc_dointvec
4591 },
1da177e4 4592 {
f8572d8f 4593 /* sentinel */
1da177e4
LT		 4594 }
4595 },
1da177e4
LT		 4596};
4597
bff16c2f 4598static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4599 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4600{
4601 int i;
1da177e4 4602 struct addrconf_sysctl_table *t;
6105e293 4603 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4604
af879cc7 4605 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4606 if (t == NULL)
f68635e6
PE		 4607 goto out;
4608
bcdd553f 4609 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4610 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4611 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4612 t->addrconf_vars[i].extra2 = net;
1da177e4 4613 }
1da177e4 4614
6105e293 4615 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4616
6105e293 4617 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4618 if (t->sysctl_header == NULL)
6105e293 4619 goto free;
f68635e6
PE		 4620
4621 p->sysctl = t;
95897312 4622 return 0;
1da177e4 4623
f68635e6 4624free:
1da177e4 4625 kfree(t);
f68635e6 4626out:
95897312 4627 return -ENOBUFS;
1da177e4
LT		 4628}
4629
408c4768
PE		 4630static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4631{
4632 struct addrconf_sysctl_table *t;
4633
4634 if (p->sysctl == NULL)
4635 return;
4636
4637 t = p->sysctl;
4638 p->sysctl = NULL;
ff538818 4639 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4640 kfree(t);
4641}
4642
f52295a9
PE		 4643static void addrconf_sysctl_register(struct inet6_dev *idev)
4644{
54716e3b 4645 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4646 &ndisc_ifinfo_sysctl_change);
c346dca1 4647 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4648 idev, &idev->cnf);
f52295a9
PE		 4649}
4650
408c4768 4651static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4652{
408c4768
PE		 4653 __addrconf_sysctl_unregister(&idev->cnf);
4654 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4655}
4656
4657
4658#endif
4659
2c8c1e72 4660static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4661{
4662 int err;
4663 struct ipv6_devconf *all, *dflt;
4664
4665 err = -ENOMEM;
4666 all = &ipv6_devconf;
4667 dflt = &ipv6_devconf_dflt;
4668
09ad9bc7 4669 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4670 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4671 if (all == NULL)
4672 goto err_alloc_all;
4673
4674 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4675 if (dflt == NULL)
4676 goto err_alloc_dflt;
56d417b1
BH		 4677 } else {
4678 /* these will be inherited by all namespaces */
4679 dflt->autoconf = ipv6_defaults.autoconf;
4680 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4681 }
4682
4683 net->ipv6.devconf_all = all;
4684 net->ipv6.devconf_dflt = dflt;
4685
4686#ifdef CONFIG_SYSCTL
f8572d8f 4687 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4688 if (err < 0)
4689 goto err_reg_all;
4690
f8572d8f 4691 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4692 if (err < 0)
4693 goto err_reg_dflt;
4694#endif
4695 return 0;
4696
4697#ifdef CONFIG_SYSCTL
4698err_reg_dflt:
4699 __addrconf_sysctl_unregister(all);
4700err_reg_all:
4701 kfree(dflt);
4702#endif
4703err_alloc_dflt:
4704 kfree(all);
4705err_alloc_all:
4706 return err;
4707}
4708
2c8c1e72 4709static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4710{
4711#ifdef CONFIG_SYSCTL
4712 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4713 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4714#endif
09ad9bc7 4715 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4716 kfree(net->ipv6.devconf_dflt);
4717 kfree(net->ipv6.devconf_all);
4718 }
4719}
4720
4721static struct pernet_operations addrconf_ops = {
4722 .init = addrconf_init_net,
4723 .exit = addrconf_exit_net,
4724};
4725
1da177e4
LT		 4726/*
4727 * Device notifier
4728 */
4729
4730int register_inet6addr_notifier(struct notifier_block *nb)
4731{
1ab1457c 4732 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4733}
7159039a
YH		 4734EXPORT_SYMBOL(register_inet6addr_notifier);
4735
1da177e4
LT		 4736int unregister_inet6addr_notifier(struct notifier_block *nb)
4737{
e21e8467 4738 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4739}
7159039a
YH		 4740EXPORT_SYMBOL(unregister_inet6addr_notifier);
4741
b382b191
TG		 4742static struct rtnl_af_ops inet6_ops = {
4743 .family = AF_INET6,
4744 .fill_link_af = inet6_fill_link_af,
4745 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4746};
4747
1da177e4
LT		 4748/*
4749 * Init / cleanup code
4750 */
4751
4752int __init addrconf_init(void)
4753{
c2e21293 4754 int i, err;
2a8cc6c8 4755
e21e8467
SH		 4756 err = ipv6_addr_label_init();
4757 if (err < 0) {
4758 printk(KERN_CRIT "IPv6 Addrconf:"
4759 " cannot initialize default policy table: %d.\n", err);
2cc6d2bf 4760 goto out;
2a8cc6c8 4761 }
1da177e4 4762
2cc6d2bf
NH		 4763 err = register_pernet_subsys(&addrconf_ops);
4764 if (err < 0)
4765 goto out_addrlabel;
e0da5a48 4766
1da177e4
LT		 4767 /* The addrconf netdev notifier requires that loopback_dev
4768 * has it's ipv6 private information allocated and setup
4769 * before it can bring up and give link-local addresses
4770 * to other devices which are up.
4771 *
4772 * Unfortunately, loopback_dev is not necessarily the first
4773 * entry in the global dev_base list of net devices. In fact,
4774 * it is likely to be the very last entry on that list.
4775 * So this causes the notifier registry below to try and
4776 * give link-local addresses to all devices besides loopback_dev
4777 * first, then loopback_dev, which cases all the non-loopback_dev
4778 * devices to fail to get a link-local address.
4779 *
4780 * So, as a temporary fix, allocate the ipv6 structure for
4781 * loopback_dev first by hand.
4782 * Longer term, all of the dependencies ipv6 has upon the loopback
4783 * device and it being up should be removed.
4784 */
4785 rtnl_lock();
2774c7ab 4786 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4787 err = -ENOMEM;
4788 rtnl_unlock();
4789 if (err)
e0da5a48 4790 goto errlo;
1da177e4 4791
c2e21293 4792 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4793 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4794
1da177e4
LT		 4795 register_netdevice_notifier(&ipv6_dev_notf);
4796
1da177e4 4797 addrconf_verify(0);
c127ea2c 4798
b382b191
TG		 4799 err = rtnl_af_register(&inet6_ops);
4800 if (err < 0)
4801 goto errout_af;
4802
c7ac8679
GR		 4803 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4804 NULL);
c127ea2c
TG		 4805 if (err < 0)
4806 goto errout;
4807
4808 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4809 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4810 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4811 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4812 inet6_dump_ifaddr, NULL);
4813 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4814 inet6_dump_ifmcaddr, NULL);
4815 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4816 inet6_dump_ifacaddr, NULL);
c127ea2c 4817
2a8cc6c8
YH		 4818 ipv6_addr_label_rtnl_register();
4819
1da177e4 4820 return 0;
c127ea2c 4821errout:
b382b191
TG		 4822 rtnl_af_unregister(&inet6_ops);
4823errout_af:
c127ea2c 4824 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4825errlo:
4826 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4827out_addrlabel:
4828 ipv6_addr_label_cleanup();
4829out:
c127ea2c 4830 return err;
1da177e4
LT		 4831}
4832
09f7709f 4833void addrconf_cleanup(void)
1da177e4 4834{
176c39af 4835 struct net_device *dev;
1da177e4
LT		 4836 int i;
4837
4838 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4839 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4840 ipv6_addr_label_cleanup();
1da177e4
LT		 4841
4842 rtnl_lock();
4843
b382b191
TG		 4844 __rtnl_af_unregister(&inet6_ops);
4845
176c39af
DL		 4846 /* clean dev list */
4847 for_each_netdev(&init_net, dev) {
4848 if (__in6_dev_get(dev) == NULL)
4849 continue;
4850 addrconf_ifdown(dev, 1);
4851 }
4852 addrconf_ifdown(init_net.loopback_dev, 2);
4853
1da177e4
LT		 4854 /*
4855 * Check hash table.
4856 */
5c578aed 4857 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4858 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4859 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4860 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4861
4862 del_timer(&addr_chk_timer);
1da177e4 4863 rtnl_unlock();
1da177e4 4864}
Linux kernel - Deliverables
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