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net decnet: Convert to use register_net_sysctl
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
bc3b2d7f 90#include <linux/export.h>
1da177e4
LT		 91
92/* Set to 3 to get tracing... */
93#define ACONF_DEBUG 2
94
95#if ACONF_DEBUG >= 3
96#define ADBG(x) printk x
97#else
98#define ADBG(x)
99#endif
100
101#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 102
103static inline u32 cstamp_delta(unsigned long cstamp)
104{
105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
106}
1da177e4 107
b2db7564
YH		 108#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
109#define ADDRCONF_TIMER_FUZZ (HZ / 4)
110#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
111
1da177e4 112#ifdef CONFIG_SYSCTL
f52295a9 113static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 114static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115#else
116static inline void addrconf_sysctl_register(struct inet6_dev *idev)
117{
118}
119
120static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
121{
122}
1da177e4
LT		 123#endif
124
125#ifdef CONFIG_IPV6_PRIVACY
126static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 127static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 128static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 129#endif
130
1b34be74 131static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 132static int ipv6_count_addresses(struct inet6_dev *idev);
133
134/*
135 * Configured unicast address hash table
136 */
c2e21293 137static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 138static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 139
1da177e4
LT		 140static void addrconf_verify(unsigned long);
141
8d06afab 142static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 143static DEFINE_SPINLOCK(addrconf_verify_lock);
144
145static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
146static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147
93d9b7d7
JP		 148static void addrconf_type_change(struct net_device *dev,
149 unsigned long event);
1da177e4
LT		 150static int addrconf_ifdown(struct net_device *dev, int how);
151
cf22f9a2 152static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 153static void addrconf_dad_timer(unsigned long data);
154static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 155static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 156static void addrconf_rs_timer(unsigned long data);
157static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159
1ab1457c 160static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 161 struct prefix_info *pinfo);
3e81c6da
DM		 162static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
163 struct net_device *dev);
1da177e4 164
e041c683 165static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 166
888c848e 167static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 168 .forwarding = 0,
169 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
170 .mtu6 = IPV6_MIN_MTU,
171 .accept_ra = 1,
172 .accept_redirects = 1,
173 .autoconf = 1,
174 .force_mld_version = 0,
175 .dad_transmits = 1,
176 .rtr_solicits = MAX_RTR_SOLICITATIONS,
177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
179#ifdef CONFIG_IPV6_PRIVACY
180 .use_tempaddr = 0,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185#endif
186 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 187 .accept_ra_defrtr = 1,
c4fd30eb 188 .accept_ra_pinfo = 1,
930d6ff2
YH		 189#ifdef CONFIG_IPV6_ROUTER_PREF
190 .accept_ra_rtr_pref = 1,
52e16356 191 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 192#ifdef CONFIG_IPV6_ROUTE_INFO
193 .accept_ra_rt_info_max_plen = 0,
194#endif
930d6ff2 195#endif
fbea49e1 196 .proxy_ndp = 0,
0bcbc926 197 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 198 .disable_ipv6 = 0,
1b34be74 199 .accept_dad = 1,
1da177e4
LT		 200};
201
ab32ea5d 202static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 203 .forwarding = 0,
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
206 .accept_ra = 1,
207 .accept_redirects = 1,
208 .autoconf = 1,
209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213#ifdef CONFIG_IPV6_PRIVACY
214 .use_tempaddr = 0,
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
219#endif
220 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 221 .accept_ra_defrtr = 1,
c4fd30eb 222 .accept_ra_pinfo = 1,
930d6ff2
YH		 223#ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
52e16356 225 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 226#ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228#endif
930d6ff2 229#endif
fbea49e1 230 .proxy_ndp = 0,
0bcbc926 231 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 232 .disable_ipv6 = 0,
1b34be74 233 .accept_dad = 1,
1da177e4
LT		 234};
235
236/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 237const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 238const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 239const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
240const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 241
f24e3d65 242/* Check if a valid qdisc is available */
05297949 243static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 244{
05297949 245 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 246}
247
2b5ead46
YH		 248/* Check if a route is valid prefix route */
249static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250{
a02cec21 251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 252}
253
1da177e4
LT		 254static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255{
256 if (del_timer(&ifp->timer))
257 __in6_ifa_put(ifp);
258}
259
e21e8467 260enum addrconf_timer_t {
1da177e4
LT		 261 AC_NONE,
262 AC_DAD,
263 AC_RS,
264};
265
266static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
268 unsigned long when)
269{
270 if (!del_timer(&ifp->timer))
271 in6_ifa_hold(ifp);
272
273 switch (what) {
274 case AC_DAD:
275 ifp->timer.function = addrconf_dad_timer;
276 break;
277 case AC_RS:
278 ifp->timer.function = addrconf_rs_timer;
279 break;
e21e8467
SH		 280 default:
281 break;
1da177e4
LT		 282 }
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
285}
286
7f7d9a6b
HX		 287static int snmp6_alloc_dev(struct inet6_dev *idev)
288{
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 292 goto err_ip;
be281e55
ED		 293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 GFP_KERNEL);
295 if (!idev->stats.icmpv6dev)
7f7d9a6b 296 goto err_icmp;
be281e55
ED		 297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6msgdev)
14878f75 300 goto err_icmpmsg;
7f7d9a6b
HX		 301
302 return 0;
303
14878f75 304err_icmpmsg:
be281e55 305 kfree(idev->stats.icmpv6dev);
7f7d9a6b 306err_icmp:
7d720c3e 307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 308err_ip:
aaf70ec7 309 return -ENOMEM;
7f7d9a6b
HX		 310}
311
16910b98 312static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 313{
be281e55
ED		 314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
7d720c3e 316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 317}
318
1da177e4
LT		 319/* Nobody refers to this device, we may destroy it. */
320
321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4
LT		 328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
e21e8467 333 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
38f57d1a 337 kfree_rcu(idev, rcu);
1da177e4 338}
7159039a
YH		 339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
8e5e8f30 341static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 342{
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
1ab1457c 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 351
1ab1457c
YH		 352 if (ndev == NULL)
353 return NULL;
322f74a4
IO		 354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
502a2ffd 357 INIT_LIST_HEAD(&ndev->addr_list);
358
c346dca1 359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
0187bdfb
BH		 367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
322f74a4
IO		 369 /* We refer to the device */
370 dev_hold(dev);
1da177e4 371
322f74a4
IO		 372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 375 __func__, dev->name));
322f74a4 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 377 dev_put(dev);
378 kfree(ndev);
322f74a4
IO		 379 return NULL;
380 }
1da177e4 381
322f74a4
IO		 382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 385 __func__, dev->name));
322f74a4
IO		 386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
1da177e4 396
1b34be74
YH		 397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
b077d7ab
YH		 400#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407#endif
408
1da177e4 409#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 410 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
9625ed72 414 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 415 dev->type == ARPHRD_SIT ||
0be669bb 416 dev->type == ARPHRD_NONE) {
322f74a4
IO		 417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
1da177e4
LT		 422#endif
423
f24e3d65 424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 425 ndev->if_flags |= IF_READY;
426
322f74a4
IO		 427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
f52295a9 429 addrconf_sysctl_register(ndev);
30c4cf57 430 /* protected by rtnl_lock */
cf778b00 431 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 432
433 /* Join all-node multicast group */
f3ee4010 434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 435
d6ddef9e 436 /* Join all-router multicast group if forwarding is set */
8b2aaede 437 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
439
1da177e4
LT		 440 return ndev;
441}
442
8e5e8f30 443static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
e21e8467
SH		 449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
1da177e4
LT		 453 return NULL;
454 }
c5e33bdd 455
1da177e4
LT		 456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
1da177e4
LT		 466
467 if (!idev)
468 return;
469 dev = idev->dev;
0187bdfb
BH		 470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
1da177e4 472 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 473 if (idev->cnf.forwarding)
f3ee4010 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 475 else
f3ee4010 476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 477 }
502a2ffd 478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
1da177e4
LT		 482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
e186932b 490static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
c6d14c84
ED		 495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 497 idev = __in6_dev_get(dev);
498 if (idev) {
e186932b
PE		 499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
1da177e4
LT		 501 if (changed)
502 dev_forward_change(idev);
503 }
1da177e4 504 }
c6d14c84 505 rcu_read_unlock();
1da177e4 506}
c8fecf22 507
013d97e9 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 509{
bff16c2f 510 struct net *net;
013d97e9
FR		 511 int old;
512
513 if (!rtnl_trylock())
514 return restart_syscall();
bff16c2f
PE		 515
516 net = (struct net *)table->extra2;
013d97e9
FR		 517 old = *p;
518 *p = newf;
b325fddb 519
013d97e9
FR		 520 if (p == &net->ipv6.devconf_dflt->forwarding) {
521 rtnl_unlock();
522 return 0;
88af182e 523 }
c8fecf22 524
e186932b 525 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
013d97e9 528 } else if ((!newf) ^ (!old))
c8fecf22 529 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 530 rtnl_unlock();
c8fecf22 531
013d97e9 532 if (newf)
7b4da532 533 rt6_purge_dflt_routers(net);
b325fddb 534 return 1;
c8fecf22 535}
1da177e4
LT		 536#endif
537
5c578aed 538/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 539void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
540{
c2e21293 541 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 542
1da177e4
LT		 543#ifdef NET_REFCNT_DEBUG
544 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
545#endif
546
547 in6_dev_put(ifp->idev);
548
549 if (del_timer(&ifp->timer))
e21e8467 550 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 551
e9d3e084 552 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 553 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 554 return;
555 }
d8d1f30b 556 dst_release(&ifp->rt->dst);
1da177e4 557
e5785985 558 kfree_rcu(ifp, rcu);
1da177e4
LT		 559}
560
e55ffac6
BH		 561static void
562ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
563{
502a2ffd 564 struct list_head *p;
8a6ce0c0 565 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 566
567 /*
568 * Each device address list is sorted in order of scope -
569 * global before linklocal.
570 */
502a2ffd 571 list_for_each(p, &idev->addr_list) {
572 struct inet6_ifaddr *ifa
573 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 574 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 575 break;
576 }
577
b54c9b98 578 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 579}
580
3a88a81d 581static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 582{
3eb84f49
YH		 583 /*
584 * We perform the hash function over the last 64 bits of the address
585 * This will include the IEEE address token on links that support it.
586 */
0eae88f3
ED		 587 return jhash_2words((__force u32)addr->s6_addr32[2],
588 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 589 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 590}
591
1da177e4
LT		 592/* On success it returns ifp with increased reference count */
593
594static struct inet6_ifaddr *
595ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 596 int scope, u32 flags)
1da177e4
LT		 597{
598 struct inet6_ifaddr *ifa = NULL;
599 struct rt6_info *rt;
3a88a81d 600 unsigned int hash;
1da177e4 601 int err = 0;
d68b8270
YH		 602 int addr_type = ipv6_addr_type(addr);
603
604 if (addr_type == IPV6_ADDR_ANY ||
605 addr_type & IPV6_ADDR_MULTICAST ||
606 (!(idev->dev->flags & IFF_LOOPBACK) &&
607 addr_type & IPV6_ADDR_LOOPBACK))
608 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 609
8814c4b5 610 rcu_read_lock_bh();
1da177e4
LT		 611 if (idev->dead) {
612 err = -ENODEV; /*XXX*/
613 goto out2;
614 }
615
56d417b1 616 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 617 err = -EACCES;
618 goto out2;
619 }
620
5c578aed 621 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 622
623 /* Ignore adding duplicate addresses on an interface */
c346dca1 624 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 625 ADBG(("ipv6_add_addr: already assigned\n"));
626 err = -EEXIST;
627 goto out;
628 }
629
322f74a4 630 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 631
632 if (ifa == NULL) {
633 ADBG(("ipv6_add_addr: malloc failed\n"));
634 err = -ENOBUFS;
635 goto out;
636 }
637
8f031519 638 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 639 if (IS_ERR(rt)) {
640 err = PTR_ERR(rt);
641 goto out;
642 }
643
4e3fd7a0 644 ifa->addr = *addr;
1da177e4
LT		 645
646 spin_lock_init(&ifa->lock);
e9d3e084 647 spin_lock_init(&ifa->state_lock);
1da177e4 648 init_timer(&ifa->timer);
c2e21293 649 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 650 ifa->timer.data = (unsigned long) ifa;
651 ifa->scope = scope;
652 ifa->prefix_len = pfxlen;
653 ifa->flags = flags | IFA_F_TENTATIVE;
654 ifa->cstamp = ifa->tstamp = jiffies;
655
57f5f544
KF		 656 ifa->rt = rt;
657
1da177e4
LT		 658 ifa->idev = idev;
659 in6_dev_hold(idev);
660 /* For caller */
661 in6_ifa_hold(ifa);
662
663 /* Add to big hash table */
664 hash = ipv6_addr_hash(addr);
665
5c578aed 666 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 667 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 668
669 write_lock(&idev->lock);
670 /* Add to inet6_dev unicast addr list. */
e55ffac6 671 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 672
673#ifdef CONFIG_IPV6_PRIVACY
674 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 675 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 676 in6_ifa_hold(ifa);
677 }
678#endif
679
1da177e4
LT		 680 in6_ifa_hold(ifa);
681 write_unlock(&idev->lock);
682out2:
8814c4b5 683 rcu_read_unlock_bh();
1da177e4 684
fd92833a 685 if (likely(err == 0))
e041c683 686 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 687 else {
688 kfree(ifa);
689 ifa = ERR_PTR(err);
690 }
691
692 return ifa;
693out:
5c578aed 694 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 695 goto out2;
696}
697
698/* This function wants to get referenced ifp and releases it before return */
699
700static void ipv6_del_addr(struct inet6_ifaddr *ifp)
701{
502a2ffd 702 struct inet6_ifaddr *ifa, *ifn;
1da177e4 703 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 704 int state;
1da177e4
LT		 705 int deleted = 0, onlink = 0;
706 unsigned long expires = jiffies;
707
4c5ff6a6
HX		 708 spin_lock_bh(&ifp->state_lock);
709 state = ifp->state;
e9d3e084 710 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 711 spin_unlock_bh(&ifp->state_lock);
712
713 if (state == INET6_IFADDR_STATE_DEAD)
714 goto out;
1da177e4 715
5c578aed 716 spin_lock_bh(&addrconf_hash_lock);
717 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 718 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 719
720 write_lock_bh(&idev->lock);
721#ifdef CONFIG_IPV6_PRIVACY
722 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 723 list_del(&ifp->tmp_list);
724 if (ifp->ifpub) {
725 in6_ifa_put(ifp->ifpub);
726 ifp->ifpub = NULL;
1da177e4 727 }
372e6c8f 728 __in6_ifa_put(ifp);
1da177e4
LT		 729 }
730#endif
731
502a2ffd 732 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 733 if (ifa == ifp) {
502a2ffd 734 list_del_init(&ifp->if_list);
1da177e4 735 __in6_ifa_put(ifp);
502a2ffd 736
1da177e4
LT		 737 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
738 break;
739 deleted = 1;
1d142804 740 continue;
1da177e4
LT		 741 } else if (ifp->flags & IFA_F_PERMANENT) {
742 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
743 ifp->prefix_len)) {
744 if (ifa->flags & IFA_F_PERMANENT) {
745 onlink = 1;
746 if (deleted)
747 break;
748 } else {
749 unsigned long lifetime;
750
751 if (!onlink)
752 onlink = -1;
753
754 spin_lock(&ifa->lock);
4bed72e4
YH		 755
756 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
757 /*
758 * Note: Because this address is
759 * not permanent, lifetime <
760 * LONG_MAX / HZ here.
761 */
1da177e4
LT		 762 if (time_before(expires,
763 ifa->tstamp + lifetime * HZ))
764 expires = ifa->tstamp + lifetime * HZ;
765 spin_unlock(&ifa->lock);
766 }
767 }
768 }
769 }
770 write_unlock_bh(&idev->lock);
771
b2238566
AV		 772 addrconf_del_timer(ifp);
773
1da177e4
LT		 774 ipv6_ifa_notify(RTM_DELADDR, ifp);
775
e041c683 776 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 777
1da177e4
LT		 778 /*
779 * Purge or update corresponding prefix
780 *
781 * 1) we don't purge prefix here if address was not permanent.
782 * prefix is managed by its own lifetime.
783 * 2) if there're no addresses, delete prefix.
784 * 3) if there're still other permanent address(es),
785 * corresponding prefix is still permanent.
786 * 4) otherwise, update prefix lifetime to the
787 * longest valid lifetime among the corresponding
788 * addresses on the device.
789 * Note: subsequent RA will update lifetime.
790 *
791 * --yoshfuji
792 */
793 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
794 struct in6_addr prefix;
795 struct rt6_info *rt;
c346dca1 796 struct net *net = dev_net(ifp->idev->dev);
1da177e4 797 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 798 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 799
2b5ead46 800 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 801 if (onlink == 0) {
e0a1ad73 802 ip6_del_rt(rt);
1da177e4
LT		 803 rt = NULL;
804 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 805 rt6_set_expires(rt, expires);
1da177e4
LT		 806 }
807 }
d8d1f30b 808 dst_release(&rt->dst);
1da177e4
LT		 809 }
810
c3968a85
DW		 811 /* clean up prefsrc entries */
812 rt6_remove_prefsrc(ifp);
4c5ff6a6 813out:
1da177e4
LT		 814 in6_ifa_put(ifp);
815}
816
817#ifdef CONFIG_IPV6_PRIVACY
818static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
819{
820 struct inet6_dev *idev = ifp->idev;
821 struct in6_addr addr, *tmpaddr;
76f793e3 822 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 823 unsigned long regen_advance;
1da177e4
LT		 824 int tmp_plen;
825 int ret = 0;
826 int max_addresses;
95c385b4 827 u32 addr_flags;
76f793e3 828 unsigned long now = jiffies;
1da177e4
LT		 829
830 write_lock(&idev->lock);
831 if (ift) {
832 spin_lock_bh(&ift->lock);
833 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
834 spin_unlock_bh(&ift->lock);
835 tmpaddr = &addr;
836 } else {
837 tmpaddr = NULL;
838 }
839retry:
840 in6_dev_hold(idev);
841 if (idev->cnf.use_tempaddr <= 0) {
842 write_unlock(&idev->lock);
843 printk(KERN_INFO
844 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
845 in6_dev_put(idev);
846 ret = -1;
847 goto out;
848 }
849 spin_lock_bh(&ifp->lock);
850 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
851 idev->cnf.use_tempaddr = -1; /*XXX*/
852 spin_unlock_bh(&ifp->lock);
853 write_unlock(&idev->lock);
854 printk(KERN_WARNING
855 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
856 in6_dev_put(idev);
857 ret = -1;
858 goto out;
859 }
860 in6_ifa_hold(ifp);
861 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
862 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
863 spin_unlock_bh(&ifp->lock);
864 write_unlock(&idev->lock);
865 printk(KERN_WARNING
866 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
867 in6_ifa_put(ifp);
868 in6_dev_put(idev);
869 ret = -1;
870 goto out;
871 }
872 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 873 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 874 tmp_valid_lft = min_t(__u32,
875 ifp->valid_lft,
7a876b0e 876 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 877 tmp_prefered_lft = min_t(__u32,
878 ifp->prefered_lft,
7a876b0e 879 idev->cnf.temp_prefered_lft + age -
784e2710 880 idev->cnf.max_desync_factor);
1da177e4
LT		 881 tmp_plen = ifp->prefix_len;
882 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 883 tmp_tstamp = ifp->tstamp;
884 spin_unlock_bh(&ifp->lock);
885
eac55bf9
BB		 886 regen_advance = idev->cnf.regen_max_retry *
887 idev->cnf.dad_transmits *
888 idev->nd_parms->retrans_time / HZ;
1da177e4 889 write_unlock(&idev->lock);
95c385b4 890
eac55bf9
BB		 891 /* A temporary address is created only if this calculated Preferred
892 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
893 * an implementation must not create a temporary address with a zero
894 * Preferred Lifetime.
895 */
896 if (tmp_prefered_lft <= regen_advance) {
897 in6_ifa_put(ifp);
898 in6_dev_put(idev);
899 ret = -1;
900 goto out;
901 }
902
95c385b4
NH		 903 addr_flags = IFA_F_TEMPORARY;
904 /* set in addrconf_prefix_rcv() */
905 if (ifp->flags & IFA_F_OPTIMISTIC)
906 addr_flags |= IFA_F_OPTIMISTIC;
907
1da177e4 908 ift = !max_addresses ||
1ab1457c 909 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 910 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 911 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
912 addr_flags) : NULL;
1da177e4
LT		 913 if (!ift || IS_ERR(ift)) {
914 in6_ifa_put(ifp);
915 in6_dev_put(idev);
916 printk(KERN_INFO
917 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
918 tmpaddr = &addr;
919 write_lock(&idev->lock);
920 goto retry;
921 }
922
923 spin_lock_bh(&ift->lock);
924 ift->ifpub = ifp;
925 ift->valid_lft = tmp_valid_lft;
926 ift->prefered_lft = tmp_prefered_lft;
76f793e3 927 ift->cstamp = now;
1da177e4
LT		 928 ift->tstamp = tmp_tstamp;
929 spin_unlock_bh(&ift->lock);
930
cf22f9a2 931 addrconf_dad_start(ift);
1da177e4
LT		 932 in6_ifa_put(ift);
933 in6_dev_put(idev);
934out:
935 return ret;
936}
937#endif
938
939/*
072047e4 940 * Choose an appropriate source address (RFC3484)
1da177e4 941 */
a9b05723
YH		 942enum {
943 IPV6_SADDR_RULE_INIT = 0,
944 IPV6_SADDR_RULE_LOCAL,
945 IPV6_SADDR_RULE_SCOPE,
946 IPV6_SADDR_RULE_PREFERRED,
947#ifdef CONFIG_IPV6_MIP6
948 IPV6_SADDR_RULE_HOA,
949#endif
950 IPV6_SADDR_RULE_OIF,
951 IPV6_SADDR_RULE_LABEL,
952#ifdef CONFIG_IPV6_PRIVACY
953 IPV6_SADDR_RULE_PRIVACY,
954#endif
955 IPV6_SADDR_RULE_ORCHID,
956 IPV6_SADDR_RULE_PREFIX,
957 IPV6_SADDR_RULE_MAX
958};
959
072047e4 960struct ipv6_saddr_score {
a9b05723
YH		 961 int rule;
962 int addr_type;
963 struct inet6_ifaddr *ifa;
964 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
965 int scopedist;
966 int matchlen;
072047e4
YH		 967};
968
a9b05723 969struct ipv6_saddr_dst {
9acd9f3a 970 const struct in6_addr *addr;
a9b05723
YH		 971 int ifindex;
972 int scope;
973 int label;
7cbca67c 974 unsigned int prefs;
a9b05723 975};
072047e4 976
b6f99a21 977static inline int ipv6_saddr_preferred(int type)
1da177e4 978{
45bb0060 979 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 980 return 1;
981 return 0;
1da177e4
LT		 982}
983
3de23255
BT		 984static int ipv6_get_saddr_eval(struct net *net,
985 struct ipv6_saddr_score *score,
a9b05723
YH		 986 struct ipv6_saddr_dst *dst,
987 int i)
988{
989 int ret;
990
991 if (i <= score->rule) {
992 switch (i) {
993 case IPV6_SADDR_RULE_SCOPE:
994 ret = score->scopedist;
995 break;
996 case IPV6_SADDR_RULE_PREFIX:
997 ret = score->matchlen;
998 break;
999 default:
1000 ret = !!test_bit(i, score->scorebits);
1001 }
1002 goto out;
1003 }
1004
1005 switch (i) {
1006 case IPV6_SADDR_RULE_INIT:
1007 /* Rule 0: remember if hiscore is not ready yet */
1008 ret = !!score->ifa;
1009 break;
1010 case IPV6_SADDR_RULE_LOCAL:
1011 /* Rule 1: Prefer same address */
1012 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1013 break;
1014 case IPV6_SADDR_RULE_SCOPE:
1015 /* Rule 2: Prefer appropriate scope
1016 *
1017 * ret
1018 * ^
1019 * -1 | d 15
1020 * ---+--+-+---> scope
1021 * |
1022 * | d is scope of the destination.
1023 * B-d | \
1024 * | \ <- smaller scope is better if
1025 * B-15 | \ if scope is enough for destinaion.
1026 * | ret = B - scope (-1 <= scope >= d <= 15).
1027 * d-C-1 | /
1028 * |/ <- greater is better
1029 * -C / if scope is not enough for destination.
1030 * /| ret = scope - C (-1 <= d < scope <= 15).
1031 *
1032 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1033 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1034 * Assume B = 0 and we get C > 29.
1035 */
1036 ret = __ipv6_addr_src_scope(score->addr_type);
1037 if (ret >= dst->scope)
1038 ret = -ret;
1039 else
1040 ret -= 128; /* 30 is enough */
1041 score->scopedist = ret;
1042 break;
1043 case IPV6_SADDR_RULE_PREFERRED:
1044 /* Rule 3: Avoid deprecated and optimistic addresses */
1045 ret = ipv6_saddr_preferred(score->addr_type) ||
1046 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1047 break;
1048#ifdef CONFIG_IPV6_MIP6
1049 case IPV6_SADDR_RULE_HOA:
7cbca67c 1050 {
a9b05723 1051 /* Rule 4: Prefer home address */
7cbca67c
YH		 1052 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1053 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1054 break;
7cbca67c 1055 }
a9b05723
YH		 1056#endif
1057 case IPV6_SADDR_RULE_OIF:
1058 /* Rule 5: Prefer outgoing interface */
1059 ret = (!dst->ifindex ||
1060 dst->ifindex == score->ifa->idev->dev->ifindex);
1061 break;
1062 case IPV6_SADDR_RULE_LABEL:
1063 /* Rule 6: Prefer matching label */
3de23255
BT		 1064 ret = ipv6_addr_label(net,
1065 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1066 score->ifa->idev->dev->ifindex) == dst->label;
1067 break;
1068#ifdef CONFIG_IPV6_PRIVACY
1069 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1070 {
a9b05723 1071 /* Rule 7: Prefer public address
25985edc 1072 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1073 */
7cbca67c
YH		 1074 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1075 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1076 score->ifa->idev->cnf.use_tempaddr >= 2;
1077 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1078 break;
7cbca67c 1079 }
a9b05723
YH		 1080#endif
1081 case IPV6_SADDR_RULE_ORCHID:
1082 /* Rule 8-: Prefer ORCHID vs ORCHID or
1083 * non-ORCHID vs non-ORCHID
1084 */
1085 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1086 ipv6_addr_orchid(dst->addr));
1087 break;
1088 case IPV6_SADDR_RULE_PREFIX:
1089 /* Rule 8: Use longest matching prefix */
1090 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1091 dst->addr);
1092 break;
1093 default:
1094 ret = 0;
1095 }
1096
1097 if (ret)
1098 __set_bit(i, score->scorebits);
1099 score->rule = i;
1100out:
1101 return ret;
1102}
1103
191cd582 1104int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1105 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1106 struct in6_addr *saddr)
1da177e4 1107{
a9b05723
YH		 1108 struct ipv6_saddr_score scores[2],
1109 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1110 struct ipv6_saddr_dst dst;
072047e4 1111 struct net_device *dev;
a9b05723 1112 int dst_type;
1da177e4 1113
a9b05723
YH		 1114 dst_type = __ipv6_addr_type(daddr);
1115 dst.addr = daddr;
1116 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1117 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1118 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1119 dst.prefs = prefs;
a9b05723
YH		 1120
1121 hiscore->rule = -1;
1122 hiscore->ifa = NULL;
1da177e4 1123
8814c4b5 1124 rcu_read_lock();
1da177e4 1125
c6d14c84 1126 for_each_netdev_rcu(net, dev) {
072047e4 1127 struct inet6_dev *idev;
072047e4 1128
a9b05723 1129 /* Candidate Source Address (section 4)
072047e4
YH		 1130 * - multicast and link-local destination address,
1131 * the set of candidate source address MUST only
1132 * include addresses assigned to interfaces
1133 * belonging to the same link as the outgoing
1134 * interface.
1135 * (- For site-local destination addresses, the
1136 * set of candidate source addresses MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same site as the outgoing
1139 * interface.)
1140 */
a9b05723
YH		 1141 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1142 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1143 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1144 continue;
1da177e4 1145
1da177e4 1146 idev = __in6_dev_get(dev);
072047e4
YH		 1147 if (!idev)
1148 continue;
1149
1150 read_lock_bh(&idev->lock);
502a2ffd 1151 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1152 int i;
072047e4 1153
a9b05723 1154 /*
6b3ae80a
YH		 1155 * - Tentative Address (RFC2462 section 5.4)
1156 * - A tentative address is not considered
1157 * "assigned to an interface" in the traditional
95c385b4 1158 * sense, unless it is also flagged as optimistic.
6b3ae80a 1159 * - Candidate Source Address (section 4)
072047e4
YH		 1160 * - In any case, anycast addresses, multicast
1161 * addresses, and the unspecified address MUST
1162 * NOT be included in a candidate set.
1163 */
a9b05723
YH		 1164 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1165 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1166 continue;
a9b05723
YH		 1167
1168 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1169
1170 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1171 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1172 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1173 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1174 "assigned as unicast address on %s",
1175 dev->name);
1176 continue;
1177 }
1178
a9b05723
YH		 1179 score->rule = -1;
1180 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1181
1182 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1183 int minihiscore, miniscore;
1184
3de23255
BT		 1185 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1186 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1187
1188 if (minihiscore > miniscore) {
1189 if (i == IPV6_SADDR_RULE_SCOPE &&
1190 score->scopedist > 0) {
1191 /*
1192 * special case:
1193 * each remaining entry
1194 * has too small (not enough)
1195 * scope, because ifa entries
1196 * are sorted by their scope
1197 * values.
1198 */
1199 goto try_nextdev;
1200 }
1201 break;
1202 } else if (minihiscore < miniscore) {
a9b05723
YH		 1203 if (hiscore->ifa)
1204 in6_ifa_put(hiscore->ifa);
1205
1206 in6_ifa_hold(score->ifa);
1207
a0bffffc 1208 swap(hiscore, score);
a9b05723
YH		 1209
1210 /* restore our iterator */
1211 score->ifa = hiscore->ifa;
1212
1213 break;
1da177e4 1214 }
072047e4 1215 }
1da177e4 1216 }
a9b05723 1217try_nextdev:
072047e4 1218 read_unlock_bh(&idev->lock);
1da177e4 1219 }
8814c4b5 1220 rcu_read_unlock();
1da177e4 1221
a9b05723 1222 if (!hiscore->ifa)
072047e4 1223 return -EADDRNOTAVAIL;
1ab1457c 1224
4e3fd7a0 1225 *saddr = hiscore->ifa->addr;
a9b05723 1226 in6_ifa_put(hiscore->ifa);
072047e4 1227 return 0;
1da177e4 1228}
5e5f3f0f 1229EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1230
95c385b4
NH		 1231int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1232 unsigned char banned_flags)
1da177e4
LT		 1233{
1234 struct inet6_dev *idev;
1235 int err = -EADDRNOTAVAIL;
1236
8814c4b5 1237 rcu_read_lock();
e21e8467
SH		 1238 idev = __in6_dev_get(dev);
1239 if (idev) {
1da177e4
LT		 1240 struct inet6_ifaddr *ifp;
1241
1242 read_lock_bh(&idev->lock);
502a2ffd 1243 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1244 if (ifp->scope == IFA_LINK &&
1245 !(ifp->flags & banned_flags)) {
4e3fd7a0 1246 *addr = ifp->addr;
1da177e4
LT		 1247 err = 0;
1248 break;
1249 }
1250 }
1251 read_unlock_bh(&idev->lock);
1252 }
8814c4b5 1253 rcu_read_unlock();
1da177e4
LT		 1254 return err;
1255}
1256
1257static int ipv6_count_addresses(struct inet6_dev *idev)
1258{
1259 int cnt = 0;
1260 struct inet6_ifaddr *ifp;
1261
1262 read_lock_bh(&idev->lock);
502a2ffd 1263 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1264 cnt++;
1265 read_unlock_bh(&idev->lock);
1266 return cnt;
1267}
1268
b71d1d42 1269int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1270 struct net_device *dev, int strict)
1da177e4 1271{
eedf042a 1272 struct inet6_ifaddr *ifp;
c2e21293 1273 struct hlist_node *node;
3a88a81d 1274 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1275
5c578aed 1276 rcu_read_lock_bh();
1277 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1278 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1279 continue;
1da177e4 1280 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1281 !(ifp->flags&IFA_F_TENTATIVE) &&
1282 (dev == NULL || ifp->idev->dev == dev ||
1283 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1284 rcu_read_unlock_bh();
1285 return 1;
1da177e4
LT		 1286 }
1287 }
5c578aed 1288
eedf042a
SH		 1289 rcu_read_unlock_bh();
1290 return 0;
1da177e4 1291}
7159039a
YH		 1292EXPORT_SYMBOL(ipv6_chk_addr);
1293
3e81c6da
DM		 1294static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1295 struct net_device *dev)
1da177e4 1296{
3e81c6da 1297 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1298 struct inet6_ifaddr *ifp;
1299 struct hlist_node *node;
1da177e4 1300
c2e21293 1301 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1302 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1303 continue;
1da177e4
LT		 1304 if (ipv6_addr_equal(&ifp->addr, addr)) {
1305 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1306 return true;
1da177e4
LT		 1307 }
1308 }
3e81c6da 1309 return false;
1da177e4
LT		 1310}
1311
b71d1d42 1312int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1313{
1314 struct inet6_dev *idev;
1315 struct inet6_ifaddr *ifa;
1316 int onlink;
1317
1318 onlink = 0;
1319 rcu_read_lock();
1320 idev = __in6_dev_get(dev);
1321 if (idev) {
1322 read_lock_bh(&idev->lock);
502a2ffd 1323 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1324 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1325 ifa->prefix_len);
1326 if (onlink)
1327 break;
1328 }
1329 read_unlock_bh(&idev->lock);
1330 }
1331 rcu_read_unlock();
1332 return onlink;
1333}
52eeeb84
YH		 1334EXPORT_SYMBOL(ipv6_chk_prefix);
1335
9acd9f3a 1336struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1337 struct net_device *dev, int strict)
1da177e4 1338{
b79d1d54 1339 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1340 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1341 struct hlist_node *node;
1da177e4 1342
5c578aed 1343 rcu_read_lock_bh();
4f70ecca 1344 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1345 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1346 continue;
1da177e4
LT		 1347 if (ipv6_addr_equal(&ifp->addr, addr)) {
1348 if (dev == NULL || ifp->idev->dev == dev ||
1349 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1350 result = ifp;
1da177e4
LT		 1351 in6_ifa_hold(ifp);
1352 break;
1353 }
1354 }
1355 }
5c578aed 1356 rcu_read_unlock_bh();
1da177e4 1357
b79d1d54 1358 return result;
1da177e4
LT		 1359}
1360
1da177e4
LT		 1361/* Gets referenced address, destroys ifaddr */
1362
cc411d0b 1363static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1364{
1da177e4
LT		 1365 if (ifp->flags&IFA_F_PERMANENT) {
1366 spin_lock_bh(&ifp->lock);
1367 addrconf_del_timer(ifp);
1368 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1369 if (dad_failed)
1370 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1371 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1372 if (dad_failed)
1373 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1374 in6_ifa_put(ifp);
1375#ifdef CONFIG_IPV6_PRIVACY
1376 } else if (ifp->flags&IFA_F_TEMPORARY) {
1377 struct inet6_ifaddr *ifpub;
1378 spin_lock_bh(&ifp->lock);
1379 ifpub = ifp->ifpub;
1380 if (ifpub) {
1381 in6_ifa_hold(ifpub);
1382 spin_unlock_bh(&ifp->lock);
1383 ipv6_create_tempaddr(ifpub, ifp);
1384 in6_ifa_put(ifpub);
1385 } else {
1386 spin_unlock_bh(&ifp->lock);
1387 }
1388 ipv6_del_addr(ifp);
1389#endif
1390 } else
1391 ipv6_del_addr(ifp);
1392}
1393
f2344a13
HX		 1394static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1395{
1396 int err = -ENOENT;
1397
1398 spin_lock(&ifp->state_lock);
1399 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1400 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1401 err = 0;
1402 }
1403 spin_unlock(&ifp->state_lock);
1404
1405 return err;
1406}
1407
3c21edbd
YH		 1408void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1409{
1b34be74 1410 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1411
853dc2e0
UB		 1412 if (addrconf_dad_end(ifp)) {
1413 in6_ifa_put(ifp);
f2344a13 1414 return;
853dc2e0 1415 }
f2344a13 1416
9bdd8d40 1417 if (net_ratelimit())
0522fea6
JR		 1418 printk(KERN_INFO "%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
1517static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1518{
1519 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1520 if (dev->addr_len != ARCNET_ALEN)
1521 return -1;
1522 memset(eui, 0, 7);
8e5e8f30 1523 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1524 return 0;
1525}
1526
1527static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1528{
1529 if (dev->addr_len != INFINIBAND_ALEN)
1530 return -1;
1531 memcpy(eui, dev->dev_addr + 12, 8);
1532 eui[0] |= 2;
1533 return 0;
1534}
1535
c61393ea 1536static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1537{
9af28511
SH		 1538 if (addr == 0)
1539 return -1;
dfd982ba
YH		 1540 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1541 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1542 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1543 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1544 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1545 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1546 eui[1] = 0;
1547 eui[2] = 0x5E;
1548 eui[3] = 0xFE;
1549 memcpy(eui + 4, &addr, 4);
1550 return 0;
1551}
dfd982ba
YH		 1552
1553static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1554{
1555 if (dev->priv_flags & IFF_ISATAP)
1556 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1557 return -1;
1558}
1559
aee80b54 1560static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1561{
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563}
1564
1da177e4
LT		 1565static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1566{
1567 switch (dev->type) {
1568 case ARPHRD_ETHER:
1569 case ARPHRD_FDDI:
1570 case ARPHRD_IEEE802_TR:
073a8e0e 1571 return addrconf_ifid_eui48(eui, dev);
1da177e4 1572 case ARPHRD_ARCNET:
073a8e0e 1573 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1574 case ARPHRD_INFINIBAND:
073a8e0e 1575 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1576 case ARPHRD_SIT:
dfd982ba 1577 return addrconf_ifid_sit(eui, dev);
aee80b54 1578 case ARPHRD_IPGRE:
1579 return addrconf_ifid_gre(eui, dev);
1da177e4
LT		 1580 }
1581 return -1;
1582}
1583
1584static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1585{
1586 int err = -1;
1587 struct inet6_ifaddr *ifp;
1588
1589 read_lock_bh(&idev->lock);
502a2ffd 1590 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1591 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1592 memcpy(eui, ifp->addr.s6_addr+8, 8);
1593 err = 0;
1594 break;
1595 }
1596 }
1597 read_unlock_bh(&idev->lock);
1598 return err;
1599}
1600
1601#ifdef CONFIG_IPV6_PRIVACY
1602/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1603static int __ipv6_regen_rndid(struct inet6_dev *idev)
1604{
1da177e4 1605regen:
955189ef 1606 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1607 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1608
1609 /*
1610 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1611 * check if generated address is not inappropriate
1612 *
1613 * - Reserved subnet anycast (RFC 2526)
1614 * 11111101 11....11 1xxxxxxx
c7dc89c0 1615 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1616 * 00-00-5E-FE-xx-xx-xx-xx
1617 * - value 0
1618 * - XXX: already assigned to an address on the device
1619 */
1ab1457c 1620 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1621 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1622 (idev->rndid[7]&0x80))
1623 goto regen;
1624 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1625 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1626 goto regen;
1627 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1628 goto regen;
1629 }
1630
1631 return 0;
1632}
1633
1634static void ipv6_regen_rndid(unsigned long data)
1635{
1636 struct inet6_dev *idev = (struct inet6_dev *) data;
1637 unsigned long expires;
1638
8814c4b5 1639 rcu_read_lock_bh();
1da177e4
LT		 1640 write_lock_bh(&idev->lock);
1641
1642 if (idev->dead)
1643 goto out;
1644
1645 if (__ipv6_regen_rndid(idev) < 0)
1646 goto out;
1ab1457c 1647
1da177e4 1648 expires = jiffies +
1ab1457c 1649 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1650 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1651 idev->cnf.max_desync_factor * HZ;
1da177e4
LT		 1652 if (time_before(expires, jiffies)) {
1653 printk(KERN_WARNING
1654 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1655 idev->dev->name);
1656 goto out;
1657 }
1658
1659 if (!mod_timer(&idev->regen_timer, expires))
1660 in6_dev_hold(idev);
1661
1662out:
1663 write_unlock_bh(&idev->lock);
8814c4b5 1664 rcu_read_unlock_bh();
1da177e4
LT		 1665 in6_dev_put(idev);
1666}
1667
8e5e8f30
EZ		 1668static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1669{
1da177e4
LT		 1670 int ret = 0;
1671
1672 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1673 ret = __ipv6_regen_rndid(idev);
1674 return ret;
1675}
1676#endif
1677
1678/*
1679 * Add prefix route.
1680 */
1681
1682static void
1683addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1684 unsigned long expires, u32 flags)
1da177e4 1685{
86872cb5
TG		 1686 struct fib6_config cfg = {
1687 .fc_table = RT6_TABLE_PREFIX,
1688 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1689 .fc_ifindex = dev->ifindex,
1690 .fc_expires = expires,
1691 .fc_dst_len = plen,
1692 .fc_flags = RTF_UP | flags,
c346dca1 1693 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1694 .fc_protocol = RTPROT_KERNEL,
86872cb5 1695 };
1da177e4 1696
4e3fd7a0 1697 cfg.fc_dst = *pfx;
1da177e4
LT		 1698
1699 /* Prevent useless cloning on PtP SIT.
1700 This thing is done here expecting that the whole
1701 class of non-broadcast devices need not cloning.
1702 */
0be669bb 1703#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1704 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1705 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1706#endif
1da177e4 1707
86872cb5 1708 ip6_route_add(&cfg);
1da177e4
LT		 1709}
1710
14ef37b6
AH		 1711
1712static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1713 int plen,
1714 const struct net_device *dev,
1715 u32 flags, u32 noflags)
1716{
1717 struct fib6_node *fn;
1718 struct rt6_info *rt = NULL;
1719 struct fib6_table *table;
1720
1721 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1722 if (table == NULL)
1723 return NULL;
1724
1725 write_lock_bh(&table->tb6_lock);
1726 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1727 if (!fn)
1728 goto out;
1729 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1730 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1731 continue;
1732 if ((rt->rt6i_flags & flags) != flags)
1733 continue;
1734 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1735 continue;
1736 dst_hold(&rt->dst);
1737 break;
1738 }
1739out:
1740 write_unlock_bh(&table->tb6_lock);
1741 return rt;
1742}
1743
1744
1da177e4
LT		 1745/* Create "default" multicast route to the interface */
1746
1747static void addrconf_add_mroute(struct net_device *dev)
1748{
86872cb5
TG		 1749 struct fib6_config cfg = {
1750 .fc_table = RT6_TABLE_LOCAL,
1751 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1752 .fc_ifindex = dev->ifindex,
1753 .fc_dst_len = 8,
1754 .fc_flags = RTF_UP,
c346dca1 1755 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1756 };
1757
1758 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1759
1760 ip6_route_add(&cfg);
1da177e4
LT		 1761}
1762
0be669bb 1763#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1764static void sit_route_add(struct net_device *dev)
1765{
86872cb5
TG		 1766 struct fib6_config cfg = {
1767 .fc_table = RT6_TABLE_MAIN,
1768 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1769 .fc_ifindex = dev->ifindex,
1770 .fc_dst_len = 96,
1771 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1772 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1773 };
1da177e4
LT		 1774
1775 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1776 ip6_route_add(&cfg);
1da177e4 1777}
0be669bb 1778#endif
1da177e4
LT		 1779
1780static void addrconf_add_lroute(struct net_device *dev)
1781{
1782 struct in6_addr addr;
1783
1784 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1785 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1786}
1787
1788static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1789{
1790 struct inet6_dev *idev;
1791
1792 ASSERT_RTNL();
1793
e21e8467
SH		 1794 idev = ipv6_find_idev(dev);
1795 if (!idev)
64e724f6
BH		 1796 return ERR_PTR(-ENOBUFS);
1797
1798 if (idev->cnf.disable_ipv6)
1799 return ERR_PTR(-EACCES);
1da177e4
LT		 1800
1801 /* Add default multicast route */
4af04aba
LW		 1802 if (!(dev->flags & IFF_LOOPBACK))
1803 addrconf_add_mroute(dev);
1da177e4
LT		 1804
1805 /* Add link local route */
1806 addrconf_add_lroute(dev);
1807 return idev;
1808}
1809
e6bff995 1810void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1811{
1812 struct prefix_info *pinfo;
1813 __u32 valid_lft;
1814 __u32 prefered_lft;
1815 int addr_type;
1da177e4 1816 struct inet6_dev *in6_dev;
56d417b1 1817 struct net *net = dev_net(dev);
1da177e4
LT		 1818
1819 pinfo = (struct prefix_info *) opt;
1ab1457c 1820
1da177e4
LT		 1821 if (len < sizeof(struct prefix_info)) {
1822 ADBG(("addrconf: prefix option too short\n"));
1823 return;
1824 }
1ab1457c 1825
1da177e4
LT		 1826 /*
1827 * Validation checks ([ADDRCONF], page 19)
1828 */
1829
1830 addr_type = ipv6_addr_type(&pinfo->prefix);
1831
1832 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1833 return;
1834
1835 valid_lft = ntohl(pinfo->valid);
1836 prefered_lft = ntohl(pinfo->prefered);
1837
1838 if (prefered_lft > valid_lft) {
1839 if (net_ratelimit())
1840 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1841 return;
1842 }
1843
1844 in6_dev = in6_dev_get(dev);
1845
1846 if (in6_dev == NULL) {
1847 if (net_ratelimit())
1848 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1849 return;
1850 }
1851
1852 /*
1853 * Two things going on here:
1854 * 1) Add routes for on-link prefixes
1855 * 2) Configure prefixes with the auto flag set
1856 */
1857
4bed72e4
YH		 1858 if (pinfo->onlink) {
1859 struct rt6_info *rt;
1860 unsigned long rt_expires;
1861
6f704992
YH		 1862 /* Avoid arithmetic overflow. Really, we could
1863 * save rt_expires in seconds, likely valid_lft,
1864 * but it would require division in fib gc, that it
1865 * not good.
1866 */
4bed72e4
YH		 1867 if (HZ > USER_HZ)
1868 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1869 else
1870 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1871
4bed72e4
YH		 1872 if (addrconf_finite_timeout(rt_expires))
1873 rt_expires *= HZ;
1da177e4 1874
14ef37b6
AH		 1875 rt = addrconf_get_prefix_route(&pinfo->prefix,
1876 pinfo->prefix_len,
1877 dev,
1878 RTF_ADDRCONF | RTF_PREFIX_RT,
1879 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 1880
14ef37b6 1881 if (rt) {
6f704992
YH		 1882 /* Autoconf prefix route */
1883 if (valid_lft == 0) {
1884 ip6_del_rt(rt);
1885 rt = NULL;
4bed72e4 1886 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 1887 /* not infinity */
1716a961 1888 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 1889 } else {
1716a961 1890 rt6_clean_expires(rt);
1da177e4
LT		 1891 }
1892 } else if (valid_lft) {
6f704992 1893 clock_t expires = 0;
4bed72e4
YH		 1894 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1895 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1896 /* not infinity */
1897 flags |= RTF_EXPIRES;
1898 expires = jiffies_to_clock_t(rt_expires);
1899 }
1da177e4 1900 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1901 dev, expires, flags);
1da177e4
LT		 1902 }
1903 if (rt)
d8d1f30b 1904 dst_release(&rt->dst);
1da177e4
LT		 1905 }
1906
1907 /* Try to figure out our local address for this prefix */
1908
1909 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 1910 struct inet6_ifaddr *ifp;
1da177e4
LT		 1911 struct in6_addr addr;
1912 int create = 0, update_lft = 0;
1913
1914 if (pinfo->prefix_len == 64) {
1915 memcpy(&addr, &pinfo->prefix, 8);
1916 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1917 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1918 in6_dev_put(in6_dev);
1919 return;
1920 }
1921 goto ok;
1922 }
1923 if (net_ratelimit())
1924 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1925 pinfo->prefix_len);
1926 in6_dev_put(in6_dev);
1927 return;
1928
1929ok:
1930
53b7997f 1931 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1932
1933 if (ifp == NULL && valid_lft) {
1934 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1935 u32 addr_flags = 0;
1936
1937#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1938 if (in6_dev->cnf.optimistic_dad &&
e6bff995 1939 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 1940 addr_flags = IFA_F_OPTIMISTIC;
1941#endif
1da177e4
LT		 1942
1943 /* Do not allow to create too much of autoconfigured
1944 * addresses; this would be too easy way to crash kernel.
1945 */
1946 if (!max_addresses ||
1947 ipv6_count_addresses(in6_dev) < max_addresses)
1948 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1949 addr_type&IPV6_ADDR_SCOPE_MASK,
1950 addr_flags);
1da177e4
LT		 1951
1952 if (!ifp || IS_ERR(ifp)) {
1953 in6_dev_put(in6_dev);
1954 return;
1955 }
1956
1957 update_lft = create = 1;
1958 ifp->cstamp = jiffies;
cf22f9a2 1959 addrconf_dad_start(ifp);
1da177e4
LT		 1960 }
1961
1962 if (ifp) {
1963 int flags;
1964 unsigned long now;
1965#ifdef CONFIG_IPV6_PRIVACY
1966 struct inet6_ifaddr *ift;
1967#endif
1968 u32 stored_lft;
1969
1970 /* update lifetime (RFC2462 5.5.3 e) */
1971 spin_lock(&ifp->lock);
1972 now = jiffies;
1973 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1974 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1975 else
1976 stored_lft = 0;
1977 if (!update_lft && stored_lft) {
1978 if (valid_lft > MIN_VALID_LIFETIME ||
1979 valid_lft > stored_lft)
1980 update_lft = 1;
1981 else if (stored_lft <= MIN_VALID_LIFETIME) {
1982 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1983 /*
1984 * RFC 4862 Section 5.5.3e:
1985 * "Note that the preferred lifetime of
1986 * the corresponding address is always
1987 * reset to the Preferred Lifetime in
1988 * the received Prefix Information
1989 * option, regardless of whether the
1990 * valid lifetime is also reset or
1991 * ignored."
1992 *
1993 * So if the preferred lifetime in
1994 * this advertisement is different
1995 * than what we have stored, but the
1996 * valid lifetime is invalid, just
1997 * reset prefered_lft.
1998 *
1999 * We must set the valid lifetime
2000 * to the stored lifetime since we'll
2001 * be updating the timestamp below,
2002 * else we'll set it back to the
25985edc 2003 * minimum.
a1ed0526
BH		 2004 */
2005 if (prefered_lft != ifp->prefered_lft) {
2006 valid_lft = stored_lft;
2007 update_lft = 1;
2008 }
1da177e4
LT		 2009 } else {
2010 valid_lft = MIN_VALID_LIFETIME;
2011 if (valid_lft < prefered_lft)
2012 prefered_lft = valid_lft;
2013 update_lft = 1;
2014 }
2015 }
2016
2017 if (update_lft) {
2018 ifp->valid_lft = valid_lft;
2019 ifp->prefered_lft = prefered_lft;
2020 ifp->tstamp = now;
2021 flags = ifp->flags;
2022 ifp->flags &= ~IFA_F_DEPRECATED;
2023 spin_unlock(&ifp->lock);
2024
2025 if (!(flags&IFA_F_TENTATIVE))
2026 ipv6_ifa_notify(0, ifp);
2027 } else
2028 spin_unlock(&ifp->lock);
2029
2030#ifdef CONFIG_IPV6_PRIVACY
2031 read_lock_bh(&in6_dev->lock);
2032 /* update all temporary addresses in the list */
76f793e3
LC		 2033 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2034 tmp_list) {
2035 int age, max_valid, max_prefered;
2036
c6fbfac2
BB		 2037 if (ifp != ift->ifpub)
2038 continue;
2039
76f793e3
LC		 2040 /*
2041 * RFC 4941 section 3.3:
2042 * If a received option will extend the lifetime
2043 * of a public address, the lifetimes of
2044 * temporary addresses should be extended,
2045 * subject to the overall constraint that no
2046 * temporary addresses should ever remain
2047 * "valid" or "preferred" for a time longer than
2048 * (TEMP_VALID_LIFETIME) or
2049 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2050 * respectively.
2051 */
2052 age = (now - ift->cstamp) / HZ;
2053 max_valid = in6_dev->cnf.temp_valid_lft - age;
2054 if (max_valid < 0)
2055 max_valid = 0;
2056
2057 max_prefered = in6_dev->cnf.temp_prefered_lft -
2058 in6_dev->cnf.max_desync_factor -
2059 age;
2060 if (max_prefered < 0)
2061 max_prefered = 0;
2062
2063 if (valid_lft > max_valid)
2064 valid_lft = max_valid;
2065
2066 if (prefered_lft > max_prefered)
2067 prefered_lft = max_prefered;
2068
1da177e4
LT		 2069 spin_lock(&ift->lock);
2070 flags = ift->flags;
76f793e3
LC		 2071 ift->valid_lft = valid_lft;
2072 ift->prefered_lft = prefered_lft;
2073 ift->tstamp = now;
2074 if (prefered_lft > 0)
2075 ift->flags &= ~IFA_F_DEPRECATED;
2076
1da177e4
LT		 2077 spin_unlock(&ift->lock);
2078 if (!(flags&IFA_F_TENTATIVE))
2079 ipv6_ifa_notify(0, ift);
2080 }
2081
aed65501 2082 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2083 /*
76f793e3
LC		 2084 * When a new public address is created as
2085 * described in [ADDRCONF], also create a new
2086 * temporary address. Also create a temporary
2087 * address if it's enabled but no temporary
2088 * address currently exists.
1da177e4 2089 */
1ab1457c 2090 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2091 ipv6_create_tempaddr(ifp, NULL);
2092 } else {
2093 read_unlock_bh(&in6_dev->lock);
2094 }
2095#endif
2096 in6_ifa_put(ifp);
2097 addrconf_verify(0);
2098 }
2099 }
2100 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2101 in6_dev_put(in6_dev);
2102}
2103
2104/*
2105 * Set destination address.
2106 * Special case for SIT interfaces where we create a new "virtual"
2107 * device.
2108 */
af284937 2109int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2110{
2111 struct in6_ifreq ireq;
2112 struct net_device *dev;
2113 int err = -EINVAL;
2114
2115 rtnl_lock();
2116
2117 err = -EFAULT;
2118 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2119 goto err_exit;
2120
af284937 2121 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2122
2123 err = -ENODEV;
2124 if (dev == NULL)
2125 goto err_exit;
2126
0be669bb 2127#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2128 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2129 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2130 struct ifreq ifr;
1da177e4
LT		 2131 struct ip_tunnel_parm p;
2132
2133 err = -EADDRNOTAVAIL;
2134 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2135 goto err_exit;
2136
2137 memset(&p, 0, sizeof(p));
2138 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2139 p.iph.saddr = 0;
2140 p.iph.version = 4;
2141 p.iph.ihl = 5;
2142 p.iph.protocol = IPPROTO_IPV6;
2143 p.iph.ttl = 64;
d20b3109 2144 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2145
5bc3eb7e
SH		 2146 if (ops->ndo_do_ioctl) {
2147 mm_segment_t oldfs = get_fs();
2148
2149 set_fs(KERNEL_DS);
2150 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2151 set_fs(oldfs);
2152 } else
2153 err = -EOPNOTSUPP;
1da177e4
LT		 2154
2155 if (err == 0) {
2156 err = -ENOBUFS;
af284937
DL		 2157 dev = __dev_get_by_name(net, p.name);
2158 if (!dev)
1da177e4
LT		 2159 goto err_exit;
2160 err = dev_open(dev);
2161 }
2162 }
0be669bb 2163#endif
1da177e4
LT		 2164
2165err_exit:
2166 rtnl_unlock();
2167 return err;
2168}
2169
2170/*
2171 * Manual configuration of address on an interface
2172 */
b71d1d42 2173static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2174 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2175 __u32 valid_lft)
1da177e4
LT		 2176{
2177 struct inet6_ifaddr *ifp;
2178 struct inet6_dev *idev;
2179 struct net_device *dev;
2180 int scope;
6f704992
YH		 2181 u32 flags;
2182 clock_t expires;
4bed72e4 2183 unsigned long timeout;
1da177e4
LT		 2184
2185 ASSERT_RTNL();
1ab1457c 2186
24ef0da7
TG		 2187 if (plen > 128)
2188 return -EINVAL;
2189
0778769d
NT		 2190 /* check the lifetime */
2191 if (!valid_lft || prefered_lft > valid_lft)
2192 return -EINVAL;
2193
af284937
DL		 2194 dev = __dev_get_by_index(net, ifindex);
2195 if (!dev)
1da177e4 2196 return -ENODEV;
1ab1457c 2197
64e724f6
BH		 2198 idev = addrconf_add_dev(dev);
2199 if (IS_ERR(idev))
2200 return PTR_ERR(idev);
1da177e4
LT		 2201
2202 scope = ipv6_addr_scope(pfx);
2203
4bed72e4
YH		 2204 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2205 if (addrconf_finite_timeout(timeout)) {
2206 expires = jiffies_to_clock_t(timeout * HZ);
2207 valid_lft = timeout;
6f704992 2208 flags = RTF_EXPIRES;
4bed72e4
YH		 2209 } else {
2210 expires = 0;
2211 flags = 0;
2212 ifa_flags |= IFA_F_PERMANENT;
6f704992 2213 }
0778769d 2214
4bed72e4
YH		 2215 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2216 if (addrconf_finite_timeout(timeout)) {
2217 if (timeout == 0)
2218 ifa_flags |= IFA_F_DEPRECATED;
2219 prefered_lft = timeout;
2220 }
0778769d
NT		 2221
2222 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2223
1da177e4 2224 if (!IS_ERR(ifp)) {
06aebfb7 2225 spin_lock_bh(&ifp->lock);
0778769d
NT		 2226 ifp->valid_lft = valid_lft;
2227 ifp->prefered_lft = prefered_lft;
2228 ifp->tstamp = jiffies;
06aebfb7 2229 spin_unlock_bh(&ifp->lock);
0778769d 2230
46d48046 2231 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2232 expires, flags);
95c385b4
NH		 2233 /*
2234 * Note that section 3.1 of RFC 4429 indicates
2235 * that the Optimistic flag should not be set for
2236 * manually configured addresses
2237 */
cf22f9a2 2238 addrconf_dad_start(ifp);
1da177e4 2239 in6_ifa_put(ifp);
0778769d 2240 addrconf_verify(0);
1da177e4
LT		 2241 return 0;
2242 }
2243
2244 return PTR_ERR(ifp);
2245}
2246
b71d1d42 2247static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2248 unsigned int plen)
1da177e4
LT		 2249{
2250 struct inet6_ifaddr *ifp;
2251 struct inet6_dev *idev;
2252 struct net_device *dev;
1ab1457c 2253
24ef0da7
TG		 2254 if (plen > 128)
2255 return -EINVAL;
2256
af284937
DL		 2257 dev = __dev_get_by_index(net, ifindex);
2258 if (!dev)
1da177e4
LT		 2259 return -ENODEV;
2260
2261 if ((idev = __in6_dev_get(dev)) == NULL)
2262 return -ENXIO;
2263
2264 read_lock_bh(&idev->lock);
502a2ffd 2265 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2266 if (ifp->prefix_len == plen &&
2267 ipv6_addr_equal(pfx, &ifp->addr)) {
2268 in6_ifa_hold(ifp);
2269 read_unlock_bh(&idev->lock);
1ab1457c 2270
1da177e4
LT		 2271 ipv6_del_addr(ifp);
2272
2273 /* If the last address is deleted administratively,
2274 disable IPv6 on this interface.
2275 */
502a2ffd 2276 if (list_empty(&idev->addr_list))
1da177e4
LT		 2277 addrconf_ifdown(idev->dev, 1);
2278 return 0;
2279 }
2280 }
2281 read_unlock_bh(&idev->lock);
2282 return -EADDRNOTAVAIL;
2283}
2284
2285
af284937 2286int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2287{
2288 struct in6_ifreq ireq;
2289 int err;
1ab1457c 2290
1da177e4
LT		 2291 if (!capable(CAP_NET_ADMIN))
2292 return -EPERM;
1ab1457c 2293
1da177e4
LT		 2294 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2295 return -EFAULT;
2296
2297 rtnl_lock();
af284937
DL		 2298 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2299 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2300 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2301 rtnl_unlock();
2302 return err;
2303}
2304
af284937 2305int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2306{
2307 struct in6_ifreq ireq;
2308 int err;
1ab1457c 2309
1da177e4
LT		 2310 if (!capable(CAP_NET_ADMIN))
2311 return -EPERM;
2312
2313 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2314 return -EFAULT;
2315
2316 rtnl_lock();
af284937
DL		 2317 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2318 ireq.ifr6_prefixlen);
1da177e4
LT		 2319 rtnl_unlock();
2320 return err;
2321}
2322
b5f348e5
IJ		 2323static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2324 int plen, int scope)
2325{
2326 struct inet6_ifaddr *ifp;
2327
2328 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2329 if (!IS_ERR(ifp)) {
2330 spin_lock_bh(&ifp->lock);
2331 ifp->flags &= ~IFA_F_TENTATIVE;
2332 spin_unlock_bh(&ifp->lock);
2333 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2334 in6_ifa_put(ifp);
2335 }
2336}
2337
0be669bb 2338#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2339static void sit_add_v4_addrs(struct inet6_dev *idev)
2340{
1da177e4
LT		 2341 struct in6_addr addr;
2342 struct net_device *dev;
c346dca1 2343 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2344 int scope;
2345
2346 ASSERT_RTNL();
2347
2348 memset(&addr, 0, sizeof(struct in6_addr));
2349 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2350
2351 if (idev->dev->flags&IFF_POINTOPOINT) {
2352 addr.s6_addr32[0] = htonl(0xfe800000);
2353 scope = IFA_LINK;
2354 } else {
2355 scope = IPV6_ADDR_COMPATv4;
2356 }
2357
2358 if (addr.s6_addr32[3]) {
b5f348e5 2359 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2360 return;
2361 }
2362
6fda7350 2363 for_each_netdev(net, dev) {
8e5e8f30 2364 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2365 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2366 struct in_ifaddr *ifa;
1da177e4
LT		 2367
2368 int flag = scope;
2369
2370 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2371 int plen;
2372
2373 addr.s6_addr32[3] = ifa->ifa_local;
2374
2375 if (ifa->ifa_scope == RT_SCOPE_LINK)
2376 continue;
2377 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2378 if (idev->dev->flags&IFF_POINTOPOINT)
2379 continue;
2380 flag |= IFA_HOST;
2381 }
2382 if (idev->dev->flags&IFF_POINTOPOINT)
2383 plen = 64;
2384 else
2385 plen = 96;
2386
b5f348e5 2387 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2388 }
2389 }
1ab1457c 2390 }
1da177e4 2391}
0be669bb 2392#endif
1da177e4
LT		 2393
2394static void init_loopback(struct net_device *dev)
2395{
2396 struct inet6_dev *idev;
1da177e4
LT		 2397
2398 /* ::1 */
2399
2400 ASSERT_RTNL();
2401
2402 if ((idev = ipv6_find_idev(dev)) == NULL) {
2403 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2404 return;
2405 }
2406
b5f348e5 2407 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2408}
2409
b71d1d42 2410static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2411{
8e5e8f30 2412 struct inet6_ifaddr *ifp;
95c385b4
NH		 2413 u32 addr_flags = IFA_F_PERMANENT;
2414
2415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2416 if (idev->cnf.optimistic_dad &&
702beb87 2417 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2418 addr_flags |= IFA_F_OPTIMISTIC;
2419#endif
1da177e4 2420
95c385b4
NH		 2421
2422 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2423 if (!IS_ERR(ifp)) {
46d48046 2424 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2425 addrconf_dad_start(ifp);
1da177e4
LT		 2426 in6_ifa_put(ifp);
2427 }
2428}
2429
2430static void addrconf_dev_config(struct net_device *dev)
2431{
2432 struct in6_addr addr;
8e5e8f30 2433 struct inet6_dev *idev;
1da177e4
LT		 2434
2435 ASSERT_RTNL();
2436
74235a25
HX		 2437 if ((dev->type != ARPHRD_ETHER) &&
2438 (dev->type != ARPHRD_FDDI) &&
2439 (dev->type != ARPHRD_IEEE802_TR) &&
2440 (dev->type != ARPHRD_ARCNET) &&
2441 (dev->type != ARPHRD_INFINIBAND)) {
2442 /* Alas, we support only Ethernet autoconfiguration. */
2443 return;
2444 }
2445
1da177e4 2446 idev = addrconf_add_dev(dev);
64e724f6 2447 if (IS_ERR(idev))
1da177e4
LT		 2448 return;
2449
2450 memset(&addr, 0, sizeof(struct in6_addr));
2451 addr.s6_addr32[0] = htonl(0xFE800000);
2452
2453 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2454 addrconf_add_linklocal(idev, &addr);
2455}
2456
0be669bb 2457#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2458static void addrconf_sit_config(struct net_device *dev)
2459{
2460 struct inet6_dev *idev;
2461
2462 ASSERT_RTNL();
2463
1ab1457c
YH		 2464 /*
2465 * Configure the tunnel with one of our IPv4
2466 * addresses... we should configure all of
1da177e4
LT		 2467 * our v4 addrs in the tunnel
2468 */
2469
2470 if ((idev = ipv6_find_idev(dev)) == NULL) {
2471 printk(KERN_DEBUG "init sit: add_dev failed\n");
2472 return;
2473 }
2474
c7dc89c0
FT		 2475 if (dev->priv_flags & IFF_ISATAP) {
2476 struct in6_addr addr;
2477
2478 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2479 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2480 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2481 addrconf_add_linklocal(idev, &addr);
2482 return;
2483 }
2484
1da177e4
LT		 2485 sit_add_v4_addrs(idev);
2486
2487 if (dev->flags&IFF_POINTOPOINT) {
2488 addrconf_add_mroute(dev);
2489 addrconf_add_lroute(dev);
2490 } else
2491 sit_route_add(dev);
2492}
0be669bb 2493#endif
1da177e4 2494
aee80b54 2495#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2496static void addrconf_gre_config(struct net_device *dev)
2497{
2498 struct inet6_dev *idev;
2499 struct in6_addr addr;
2500
2501 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2502
2503 ASSERT_RTNL();
2504
2505 if ((idev = ipv6_find_idev(dev)) == NULL) {
2506 printk(KERN_DEBUG "init gre: add_dev failed\n");
2507 return;
2508 }
2509
2510 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2511 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2512
2513 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2514 addrconf_add_linklocal(idev, &addr);
2515}
2516#endif
2517
1da177e4
LT		 2518static inline int
2519ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2520{
2521 struct in6_addr lladdr;
2522
95c385b4 2523 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2524 addrconf_add_linklocal(idev, &lladdr);
2525 return 0;
2526 }
2527 return -1;
2528}
2529
2530static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2531{
2532 struct net_device *link_dev;
c346dca1 2533 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2534
2535 /* first try to inherit the link-local address from the link device */
2536 if (idev->dev->iflink &&
6fda7350 2537 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2538 if (!ipv6_inherit_linklocal(idev, link_dev))
2539 return;
2540 }
2541 /* then try to inherit it from any device */
6fda7350 2542 for_each_netdev(net, link_dev) {
1da177e4
LT		 2543 if (!ipv6_inherit_linklocal(idev, link_dev))
2544 return;
2545 }
2546 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2547}
2548
2549/*
2550 * Autoconfigure tunnel with a link-local address so routing protocols,
2551 * DHCPv6, MLD etc. can be run over the virtual link
2552 */
2553
2554static void addrconf_ip6_tnl_config(struct net_device *dev)
2555{
2556 struct inet6_dev *idev;
2557
2558 ASSERT_RTNL();
2559
e21e8467 2560 idev = addrconf_add_dev(dev);
64e724f6 2561 if (IS_ERR(idev)) {
1da177e4
LT		 2562 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2563 return;
2564 }
2565 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2566}
2567
1ab1457c 2568static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2569 void *data)
1da177e4
LT		 2570{
2571 struct net_device *dev = (struct net_device *) data;
74235a25 2572 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2573 int run_pending = 0;
b217d616 2574 int err;
1da177e4 2575
e21e8467 2576 switch (event) {
45ba9dd2 2577 case NETDEV_REGISTER:
74235a25 2578 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2579 idev = ipv6_add_dev(dev);
2580 if (!idev)
b217d616 2581 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2582 }
2583 break;
bcdd553f 2584
1da177e4 2585 case NETDEV_UP:
3c21edbd 2586 case NETDEV_CHANGE:
c2edacf8
JV		 2587 if (dev->flags & IFF_SLAVE)
2588 break;
2589
3c21edbd 2590 if (event == NETDEV_UP) {
f24e3d65 2591 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2592 /* device is not ready yet. */
2593 printk(KERN_INFO
2594 "ADDRCONF(NETDEV_UP): %s: "
2595 "link is not ready\n",
2596 dev->name);
2597 break;
2598 }
99081049 2599
d31c7b8f
EP		 2600 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2601 idev = ipv6_add_dev(dev);
2602
e3ec6cfc 2603 if (idev) {
99081049 2604 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2605 run_pending = 1;
2606 }
3c21edbd 2607 } else {
f24e3d65 2608 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2609 /* device is still not ready. */
2610 break;
2611 }
2612
2613 if (idev) {
bcdd553f 2614 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2615 /* device is already configured. */
2616 break;
3c21edbd
YH		 2617 idev->if_flags |= IF_READY;
2618 }
2619
2620 printk(KERN_INFO
2621 "ADDRCONF(NETDEV_CHANGE): %s: "
2622 "link becomes ready\n",
2623 dev->name);
2624
c5e33bdd 2625 run_pending = 1;
3c21edbd
YH		 2626 }
2627
e21e8467 2628 switch (dev->type) {
0be669bb 2629#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2630 case ARPHRD_SIT:
2631 addrconf_sit_config(dev);
2632 break;
aee80b54 2633#endif
2634#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2635 case ARPHRD_IPGRE:
2636 addrconf_gre_config(dev);
2637 break;
0be669bb 2638#endif
1da177e4
LT		 2639 case ARPHRD_TUNNEL6:
2640 addrconf_ip6_tnl_config(dev);
2641 break;
2642 case ARPHRD_LOOPBACK:
2643 init_loopback(dev);
2644 break;
2645
2646 default:
2647 addrconf_dev_config(dev);
2648 break;
3ff50b79 2649 }
bcdd553f 2650
1da177e4 2651 if (idev) {
c5e33bdd
YH		 2652 if (run_pending)
2653 addrconf_dad_run(idev);
2654
bcdd553f
SH		 2655 /*
2656 * If the MTU changed during the interface down,
2657 * when the interface up, the changed MTU must be
2658 * reflected in the idev as well as routers.
1da177e4 2659 */
bcdd553f
SH		 2660 if (idev->cnf.mtu6 != dev->mtu &&
2661 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2662 rt6_mtu_change(dev, dev->mtu);
2663 idev->cnf.mtu6 = dev->mtu;
2664 }
2665 idev->tstamp = jiffies;
2666 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2667
2668 /*
2669 * If the changed mtu during down is lower than
2670 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2671 */
2672 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2673 addrconf_ifdown(dev, 1);
1da177e4
LT		 2674 }
2675 break;
2676
2677 case NETDEV_CHANGEMTU:
d31c7b8f 2678 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2679 rt6_mtu_change(dev, dev->mtu);
2680 idev->cnf.mtu6 = dev->mtu;
2681 break;
2682 }
2683
d31c7b8f
EP		 2684 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2685 idev = ipv6_add_dev(dev);
2686 if (idev)
2687 break;
2688 }
2689
bcdd553f
SH		 2690 /*
2691 * MTU falled under IPV6_MIN_MTU.
2692 * Stop IPv6 on this interface.
2693 */
1da177e4
LT		 2694
2695 case NETDEV_DOWN:
2696 case NETDEV_UNREGISTER:
2697 /*
2698 * Remove all addresses from this interface.
2699 */
2700 addrconf_ifdown(dev, event != NETDEV_DOWN);
2701 break;
3c21edbd 2702
1da177e4 2703 case NETDEV_CHANGENAME:
1da177e4 2704 if (idev) {
5632c515 2705 snmp6_unregister_dev(idev);
408c4768 2706 addrconf_sysctl_unregister(idev);
f52295a9 2707 addrconf_sysctl_register(idev);
b217d616
HX		 2708 err = snmp6_register_dev(idev);
2709 if (err)
2710 return notifier_from_errno(err);
5632c515 2711 }
1da177e4 2712 break;
bcdd553f 2713
93d9b7d7
JP		 2714 case NETDEV_PRE_TYPE_CHANGE:
2715 case NETDEV_POST_TYPE_CHANGE:
2716 addrconf_type_change(dev, event);
75c78500 2717 break;
3ff50b79 2718 }
1da177e4
LT		 2719
2720 return NOTIFY_OK;
2721}
2722
2723/*
2724 * addrconf module should be notified of a device going up
2725 */
2726static struct notifier_block ipv6_dev_notf = {
2727 .notifier_call = addrconf_notify,
1da177e4
LT		 2728};
2729
93d9b7d7 2730static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2731{
2732 struct inet6_dev *idev;
2733 ASSERT_RTNL();
2734
2735 idev = __in6_dev_get(dev);
2736
93d9b7d7 2737 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2738 ipv6_mc_remap(idev);
93d9b7d7 2739 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2740 ipv6_mc_unmap(idev);
2741}
2742
1da177e4
LT		 2743static int addrconf_ifdown(struct net_device *dev, int how)
2744{
c346dca1 2745 struct net *net = dev_net(dev);
502a2ffd 2746 struct inet6_dev *idev;
2747 struct inet6_ifaddr *ifa;
73a8bd74 2748 int state, i;
1da177e4
LT		 2749
2750 ASSERT_RTNL();
2751
73a8bd74
DM		 2752 rt6_ifdown(net, dev);
2753 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2754
2755 idev = __in6_dev_get(dev);
2756 if (idev == NULL)
2757 return -ENODEV;
2758
bcdd553f
SH		 2759 /*
2760 * Step 1: remove reference to ipv6 device from parent device.
2761 * Do not dev_put!
1da177e4 2762 */
439e2385 2763 if (how) {
1da177e4 2764 idev->dead = 1;
8814c4b5
YH		 2765
2766 /* protected by rtnl_lock */
a9b3cd7f 2767 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2768
2769 /* Step 1.5: remove snmp6 entry */
2770 snmp6_unregister_dev(idev);
2771
2772 }
2773
73a8bd74
DM		 2774 /* Step 2: clear hash table */
2775 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2776 struct hlist_head *h = &inet6_addr_lst[i];
2777 struct hlist_node *n;
2778
2779 spin_lock_bh(&addrconf_hash_lock);
2780 restart:
2781 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2782 if (ifa->idev == idev) {
2783 hlist_del_init_rcu(&ifa->addr_lst);
2784 addrconf_del_timer(ifa);
2785 goto restart;
2786 }
2787 }
2788 spin_unlock_bh(&addrconf_hash_lock);
2789 }
2790
1da177e4
LT		 2791 write_lock_bh(&idev->lock);
2792
bcdd553f 2793 /* Step 2: clear flags for stateless addrconf */
439e2385 2794 if (!how)
3c21edbd 2795 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2796
1da177e4 2797#ifdef CONFIG_IPV6_PRIVACY
439e2385 2798 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2799 in6_dev_put(idev);
2800
bcdd553f 2801 /* Step 3: clear tempaddr list */
372e6c8f 2802 while (!list_empty(&idev->tempaddr_list)) {
2803 ifa = list_first_entry(&idev->tempaddr_list,
2804 struct inet6_ifaddr, tmp_list);
2805 list_del(&ifa->tmp_list);
1da177e4
LT		 2806 write_unlock_bh(&idev->lock);
2807 spin_lock_bh(&ifa->lock);
2808
2809 if (ifa->ifpub) {
2810 in6_ifa_put(ifa->ifpub);
2811 ifa->ifpub = NULL;
2812 }
2813 spin_unlock_bh(&ifa->lock);
2814 in6_ifa_put(ifa);
2815 write_lock_bh(&idev->lock);
2816 }
2817#endif
8f37ada5 2818
502a2ffd 2819 while (!list_empty(&idev->addr_list)) {
2820 ifa = list_first_entry(&idev->addr_list,
2821 struct inet6_ifaddr, if_list);
84e8b803 2822 addrconf_del_timer(ifa);
2823
73a8bd74 2824 list_del(&ifa->if_list);
84e8b803 2825
73a8bd74 2826 write_unlock_bh(&idev->lock);
84e8b803 2827
73a8bd74
DM		 2828 spin_lock_bh(&ifa->state_lock);
2829 state = ifa->state;
2830 ifa->state = INET6_IFADDR_STATE_DEAD;
2831 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2832
73a8bd74
DM		 2833 if (state != INET6_IFADDR_STATE_DEAD) {
2834 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2835 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2836 }
73a8bd74 2837 in6_ifa_put(ifa);
8f37ada5 2838
73a8bd74
DM		 2839 write_lock_bh(&idev->lock);
2840 }
8f37ada5 2841
1da177e4
LT		 2842 write_unlock_bh(&idev->lock);
2843
2844 /* Step 5: Discard multicast list */
439e2385 2845 if (how)
1da177e4
LT		 2846 ipv6_mc_destroy_dev(idev);
2847 else
2848 ipv6_mc_down(idev);
2849
1da177e4 2850 idev->tstamp = jiffies;
1ab1457c 2851
bcdd553f 2852 /* Last: Shot the device (if unregistered) */
439e2385 2853 if (how) {
408c4768 2854 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2855 neigh_parms_release(&nd_tbl, idev->nd_parms);
2856 neigh_ifdown(&nd_tbl, dev);
2857 in6_dev_put(idev);
2858 }
2859 return 0;
2860}
2861
2862static void addrconf_rs_timer(unsigned long data)
2863{
2864 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2865 struct inet6_dev *idev = ifp->idev;
1da177e4 2866
5b2a1953 2867 read_lock(&idev->lock);
2868 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2869 goto out;
2870
5b2a1953 2871 if (idev->cnf.forwarding)
2872 goto out;
2873
2874 /* Announcement received after solicitation was sent */
2875 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2876 goto out;
1da177e4
LT		 2877
2878 spin_lock(&ifp->lock);
5b2a1953 2879 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2880 /* The wait after the last probe can be shorter */
2881 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2882 (ifp->probes == idev->cnf.rtr_solicits) ?
2883 idev->cnf.rtr_solicit_delay :
2884 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2885 spin_unlock(&ifp->lock);
2886
5b2a1953 2887 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2888 } else {
2889 spin_unlock(&ifp->lock);
2890 /*
2891 * Note: we do not support deprecated "all on-link"
2892 * assumption any longer.
2893 */
2894 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2895 idev->dev->name);
1da177e4
LT		 2896 }
2897
2898out:
5b2a1953 2899 read_unlock(&idev->lock);
1da177e4
LT		 2900 in6_ifa_put(ifp);
2901}
2902
2903/*
2904 * Duplicate Address Detection
2905 */
3c21edbd
YH		 2906static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2907{
2908 unsigned long rand_num;
2909 struct inet6_dev *idev = ifp->idev;
2910
95c385b4
NH		 2911 if (ifp->flags & IFA_F_OPTIMISTIC)
2912 rand_num = 0;
2913 else
2914 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2915
3c21edbd
YH		 2916 ifp->probes = idev->cnf.dad_transmits;
2917 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2918}
2919
cf22f9a2 2920static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 2921{
2922 struct inet6_dev *idev = ifp->idev;
2923 struct net_device *dev = idev->dev;
1da177e4
LT		 2924
2925 addrconf_join_solict(dev, &ifp->addr);
2926
1da177e4 2927 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2928
2929 read_lock_bh(&idev->lock);
622ccdf1 2930 spin_lock(&ifp->lock);
e9d3e084 2931 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2932 goto out;
1da177e4
LT		 2933
2934 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2935 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2936 !(ifp->flags&IFA_F_TENTATIVE) ||
2937 ifp->flags & IFA_F_NODAD) {
cc411d0b 2938 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2939 spin_unlock(&ifp->lock);
1da177e4
LT		 2940 read_unlock_bh(&idev->lock);
2941
2942 addrconf_dad_completed(ifp);
2943 return;
2944 }
2945
6732bade 2946 if (!(idev->if_flags & IF_READY)) {
21809faf 2947 spin_unlock(&ifp->lock);
6732bade 2948 read_unlock_bh(&idev->lock);
3c21edbd 2949 /*
590a9887 2950 * If the device is not ready:
3c21edbd
YH		 2951 * - keep it tentative if it is a permanent address.
2952 * - otherwise, kill it.
2953 */
2954 in6_ifa_hold(ifp);
cc411d0b 2955 addrconf_dad_stop(ifp, 0);
6732bade 2956 return;
3c21edbd 2957 }
95c385b4
NH		 2958
2959 /*
2960 * Optimistic nodes can start receiving
2961 * Frames right away
2962 */
e21e8467 2963 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2964 ip6_ins_rt(ifp->rt);
2965
6732bade 2966 addrconf_dad_kick(ifp);
1da177e4 2967out:
622ccdf1 2968 spin_unlock(&ifp->lock);
1da177e4
LT		 2969 read_unlock_bh(&idev->lock);
2970}
2971
2972static void addrconf_dad_timer(unsigned long data)
2973{
2974 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2975 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2976 struct in6_addr mcaddr;
2977
f2344a13
HX		 2978 if (!ifp->probes && addrconf_dad_end(ifp))
2979 goto out;
2980
122e4519 2981 read_lock(&idev->lock);
2982 if (idev->dead || !(idev->if_flags & IF_READY)) {
2983 read_unlock(&idev->lock);
1da177e4
LT		 2984 goto out;
2985 }
21809faf 2986
2987 spin_lock(&ifp->lock);
622ccdf1
HX		 2988 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2989 spin_unlock(&ifp->lock);
2990 read_unlock(&idev->lock);
2991 goto out;
2992 }
2993
1da177e4
LT		 2994 if (ifp->probes == 0) {
2995 /*
2996 * DAD was successful
2997 */
2998
cc411d0b 2999 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 3000 spin_unlock(&ifp->lock);
122e4519 3001 read_unlock(&idev->lock);
1da177e4
LT		 3002
3003 addrconf_dad_completed(ifp);
3004
3005 goto out;
3006 }
3007
3008 ifp->probes--;
3009 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 3010 spin_unlock(&ifp->lock);
122e4519 3011 read_unlock(&idev->lock);
1da177e4
LT		 3012
3013 /* send a neighbour solicitation for our addr */
1da177e4 3014 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 3015 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 3016out:
3017 in6_ifa_put(ifp);
3018}
3019
3020static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3021{
e21e8467 3022 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3023
3024 /*
3025 * Configure the address for reception. Now it is valid.
3026 */
3027
3028 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3029
026359bc
TA		 3030 /* If added prefix is link local and we are prepared to process
3031 router advertisements, start sending router solicitations.
1da177e4
LT		 3032 */
3033
026359bc
TA		 3034 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3035 ifp->idev->cnf.accept_ra == 2) &&
1da177e4
LT		 3036 ifp->idev->cnf.rtr_solicits > 0 &&
3037 (dev->flags&IFF_LOOPBACK) == 0 &&
3038 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3039 /*
3040 * If a host as already performed a random delay
3041 * [...] as part of DAD [...] there is no need
3042 * to delay again before sending the first RS
3043 */
f3ee4010 3044 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3045
3046 spin_lock_bh(&ifp->lock);
3047 ifp->probes = 1;
3048 ifp->idev->if_flags |= IF_RS_SENT;
3049 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3050 spin_unlock_bh(&ifp->lock);
3051 }
3052}
3053
e21e8467
SH		 3054static void addrconf_dad_run(struct inet6_dev *idev)
3055{
c5e33bdd
YH		 3056 struct inet6_ifaddr *ifp;
3057
3058 read_lock_bh(&idev->lock);
502a2ffd 3059 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3060 spin_lock(&ifp->lock);
f2344a13
HX		 3061 if (ifp->flags & IFA_F_TENTATIVE &&
3062 ifp->state == INET6_IFADDR_STATE_DAD)
3063 addrconf_dad_kick(ifp);
21809faf 3064 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3065 }
3066 read_unlock_bh(&idev->lock);
3067}
3068
1da177e4
LT		 3069#ifdef CONFIG_PROC_FS
3070struct if6_iter_state {
3c40090a 3071 struct seq_net_private p;
1da177e4 3072 int bucket;
1d578303 3073 int offset;
1da177e4
LT		 3074};
3075
1d578303 3076static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3077{
3078 struct inet6_ifaddr *ifa = NULL;
3079 struct if6_iter_state *state = seq->private;
1218854a 3080 struct net *net = seq_file_net(seq);
1d578303 3081 int p = 0;
1da177e4 3082
1d578303
MM		 3083 /* initial bucket if pos is 0 */
3084 if (pos == 0) {
3085 state->bucket = 0;
3086 state->offset = 0;
3087 }
3088
3089 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3090 struct hlist_node *n;
4f70ecca 3091 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303
MM		 3092 addr_lst) {
3093 /* sync with offset */
3094 if (p < state->offset) {
3095 p++;
3096 continue;
3097 }
3098 state->offset++;
c2e21293 3099 if (net_eq(dev_net(ifa->idev->dev), net))
3100 return ifa;
1d578303
MM		 3101 }
3102
3103 /* prepare for next bucket */
3104 state->offset = 0;
3105 p = 0;
1da177e4 3106 }
c2e21293 3107 return NULL;
1da177e4
LT		 3108}
3109
c2e21293 3110static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3111 struct inet6_ifaddr *ifa)
1da177e4
LT		 3112{
3113 struct if6_iter_state *state = seq->private;
1218854a 3114 struct net *net = seq_file_net(seq);
c2e21293 3115 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3116
1d578303
MM		 3117 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3118 state->offset++;
c2e21293 3119 if (net_eq(dev_net(ifa->idev->dev), net))
3120 return ifa;
1d578303 3121 }
3c40090a 3122
c2e21293 3123 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3124 state->offset = 0;
4f70ecca 3125 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3126 &inet6_addr_lst[state->bucket], addr_lst) {
1d578303 3127 state->offset++;
c2e21293 3128 if (net_eq(dev_net(ifa->idev->dev), net))
3129 return ifa;
3130 }
1da177e4 3131 }
3c40090a 3132
c2e21293 3133 return NULL;
1da177e4
LT		 3134}
3135
1da177e4 3136static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3137 __acquires(rcu_bh)
1da177e4 3138{
5c578aed 3139 rcu_read_lock_bh();
1d578303 3140 return if6_get_first(seq, *pos);
1da177e4
LT		 3141}
3142
3143static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3144{
3145 struct inet6_ifaddr *ifa;
3146
3147 ifa = if6_get_next(seq, v);
3148 ++*pos;
3149 return ifa;
3150}
3151
3152static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3153 __releases(rcu_bh)
1da177e4 3154{
5c578aed 3155 rcu_read_unlock_bh();
1da177e4
LT		 3156}
3157
3158static int if6_seq_show(struct seq_file *seq, void *v)
3159{
3160 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3161 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3162 &ifp->addr,
1da177e4
LT		 3163 ifp->idev->dev->ifindex,
3164 ifp->prefix_len,
3165 ifp->scope,
3166 ifp->flags,
3167 ifp->idev->dev->name);
3168 return 0;
3169}
3170
56b3d975 3171static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3172 .start = if6_seq_start,
3173 .next = if6_seq_next,
3174 .show = if6_seq_show,
3175 .stop = if6_seq_stop,
3176};
3177
3178static int if6_seq_open(struct inode *inode, struct file *file)
3179{
3c40090a
DL		 3180 return seq_open_net(inode, file, &if6_seq_ops,
3181 sizeof(struct if6_iter_state));
1da177e4
LT		 3182}
3183
9a32144e 3184static const struct file_operations if6_fops = {
1da177e4
LT		 3185 .owner = THIS_MODULE,
3186 .open = if6_seq_open,
3187 .read = seq_read,
3188 .llseek = seq_lseek,
3c40090a 3189 .release = seq_release_net,
1da177e4
LT		 3190};
3191
2c8c1e72 3192static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3193{
3c40090a 3194 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3195 return -ENOMEM;
3196 return 0;
3197}
3198
2c8c1e72 3199static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3200{
3201 proc_net_remove(net, "if_inet6");
3202}
3203
3204static struct pernet_operations if6_proc_net_ops = {
3205 .init = if6_proc_net_init,
3206 .exit = if6_proc_net_exit,
3207};
3208
3209int __init if6_proc_init(void)
3210{
3211 return register_pernet_subsys(&if6_proc_net_ops);
3212}
3213
1da177e4
LT		 3214void if6_proc_exit(void)
3215{
3c40090a 3216 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3217}
3218#endif /* CONFIG_PROC_FS */
3219
59fbb3a6 3220#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3221/* Check if address is a home address configured on any interface. */
b71d1d42 3222int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3223{
3224 int ret = 0;
c2e21293 3225 struct inet6_ifaddr *ifp = NULL;
3226 struct hlist_node *n;
3a88a81d 3227 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3228
5c578aed 3229 rcu_read_lock_bh();
4f70ecca 3230 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3231 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3232 continue;
caad295f 3233 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3234 (ifp->flags & IFA_F_HOMEADDRESS)) {
3235 ret = 1;
3236 break;
3237 }
3238 }
5c578aed 3239 rcu_read_unlock_bh();
3b9f9a1c
NT		 3240 return ret;
3241}
3242#endif
3243
1da177e4
LT		 3244/*
3245 * Periodic address status verification
3246 */
3247
3248static void addrconf_verify(unsigned long foo)
3249{
b2db7564 3250 unsigned long now, next, next_sec, next_sched;
1da177e4 3251 struct inet6_ifaddr *ifp;
c2e21293 3252 struct hlist_node *node;
1da177e4
LT		 3253 int i;
3254
5c578aed 3255 rcu_read_lock_bh();
3256 spin_lock(&addrconf_verify_lock);
1da177e4 3257 now = jiffies;
b2db7564 3258 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3259
3260 del_timer(&addr_chk_timer);
3261
bcdd553f 3262 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3263restart:
4f70ecca 3264 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3265 &inet6_addr_lst[i], addr_lst) {
1da177e4 3266 unsigned long age;
1da177e4
LT		 3267
3268 if (ifp->flags & IFA_F_PERMANENT)
3269 continue;
3270
3271 spin_lock(&ifp->lock);
b2db7564
YH		 3272 /* We try to batch several events at once. */
3273 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3274
8f27ebb9
YH		 3275 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3276 age >= ifp->valid_lft) {
1da177e4
LT		 3277 spin_unlock(&ifp->lock);
3278 in6_ifa_hold(ifp);
1da177e4
LT		 3279 ipv6_del_addr(ifp);
3280 goto restart;
8f27ebb9
YH		 3281 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3282 spin_unlock(&ifp->lock);
3283 continue;
1da177e4 3284 } else if (age >= ifp->prefered_lft) {
a1ed0526 3285 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3286 int deprecate = 0;
3287
3288 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3289 deprecate = 1;
3290 ifp->flags |= IFA_F_DEPRECATED;
3291 }
3292
3293 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3294 next = ifp->tstamp + ifp->valid_lft * HZ;
3295
3296 spin_unlock(&ifp->lock);
3297
3298 if (deprecate) {
3299 in6_ifa_hold(ifp);
1da177e4
LT		 3300
3301 ipv6_ifa_notify(0, ifp);
3302 in6_ifa_put(ifp);
3303 goto restart;
3304 }
3305#ifdef CONFIG_IPV6_PRIVACY
3306 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3307 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3308 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3309 ifp->idev->cnf.dad_transmits *
3310 ifp->idev->nd_parms->retrans_time / HZ;
3311
1da177e4
LT		 3312 if (age >= ifp->prefered_lft - regen_advance) {
3313 struct inet6_ifaddr *ifpub = ifp->ifpub;
3314 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3315 next = ifp->tstamp + ifp->prefered_lft * HZ;
3316 if (!ifp->regen_count && ifpub) {
3317 ifp->regen_count++;
3318 in6_ifa_hold(ifp);
3319 in6_ifa_hold(ifpub);
3320 spin_unlock(&ifp->lock);
5c578aed 3321
291d809b
HY		 3322 spin_lock(&ifpub->lock);
3323 ifpub->regen_count = 0;
3324 spin_unlock(&ifpub->lock);
1da177e4
LT		 3325 ipv6_create_tempaddr(ifpub, ifp);
3326 in6_ifa_put(ifpub);
3327 in6_ifa_put(ifp);
3328 goto restart;
3329 }
3330 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3331 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3332 spin_unlock(&ifp->lock);
3333#endif
3334 } else {
3335 /* ifp->prefered_lft <= ifp->valid_lft */
3336 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3337 next = ifp->tstamp + ifp->prefered_lft * HZ;
3338 spin_unlock(&ifp->lock);
3339 }
3340 }
1da177e4
LT		 3341 }
3342
b2db7564
YH		 3343 next_sec = round_jiffies_up(next);
3344 next_sched = next;
3345
3346 /* If rounded timeout is accurate enough, accept it. */
3347 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3348 next_sched = next_sec;
3349
3350 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3351 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3352 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3353
3354 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3355 now, next, next_sec, next_sched));
3356
3357 addr_chk_timer.expires = next_sched;
1da177e4 3358 add_timer(&addr_chk_timer);
5c578aed 3359 spin_unlock(&addrconf_verify_lock);
3360 rcu_read_unlock_bh();
1da177e4
LT		 3361}
3362
461d8837
TG		 3363static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3364{
3365 struct in6_addr *pfx = NULL;
3366
3367 if (addr)
3368 pfx = nla_data(addr);
3369
3370 if (local) {
3371 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3372 pfx = NULL;
3373 else
3374 pfx = nla_data(local);
3375 }
3376
3377 return pfx;
3378}
3379
ef7c79ed 3380static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3381 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3382 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3383 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3384};
3385
1da177e4
LT		 3386static int
3387inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3388{
3b1e0a65 3389 struct net *net = sock_net(skb->sk);
b933f716
TG		 3390 struct ifaddrmsg *ifm;
3391 struct nlattr *tb[IFA_MAX+1];
1da177e4 3392 struct in6_addr *pfx;
b933f716 3393 int err;
1da177e4 3394
b933f716
TG		 3395 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3396 if (err < 0)
3397 return err;
3398
3399 ifm = nlmsg_data(nlh);
3400 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3401 if (pfx == NULL)
3402 return -EINVAL;
3403
af284937 3404 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3405}
3406
55ebaef1
NT		 3407static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3408 u32 prefered_lft, u32 valid_lft)
081bba5b 3409{
6f704992
YH		 3410 u32 flags;
3411 clock_t expires;
4bed72e4 3412 unsigned long timeout;
46d48046 3413
081bba5b
NT		 3414 if (!valid_lft || (prefered_lft > valid_lft))
3415 return -EINVAL;
3416
4bed72e4
YH		 3417 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3418 if (addrconf_finite_timeout(timeout)) {
3419 expires = jiffies_to_clock_t(timeout * HZ);
3420 valid_lft = timeout;
6f704992 3421 flags = RTF_EXPIRES;
4bed72e4
YH		 3422 } else {
3423 expires = 0;
3424 flags = 0;
3425 ifa_flags |= IFA_F_PERMANENT;
6f704992 3426 }
081bba5b 3427
4bed72e4
YH		 3428 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3429 if (addrconf_finite_timeout(timeout)) {
3430 if (timeout == 0)
3431 ifa_flags |= IFA_F_DEPRECATED;
3432 prefered_lft = timeout;
3433 }
081bba5b
NT		 3434
3435 spin_lock_bh(&ifp->lock);
3b9f9a1c 3436 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3437 ifp->tstamp = jiffies;
3438 ifp->valid_lft = valid_lft;
3439 ifp->prefered_lft = prefered_lft;
3440
3441 spin_unlock_bh(&ifp->lock);
3442 if (!(ifp->flags&IFA_F_TENTATIVE))
3443 ipv6_ifa_notify(0, ifp);
081bba5b 3444
46d48046 3445 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3446 expires, flags);
081bba5b
NT		 3447 addrconf_verify(0);
3448
3449 return 0;
3450}
3451
1da177e4
LT		 3452static int
3453inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3454{
3b1e0a65 3455 struct net *net = sock_net(skb->sk);
461d8837
TG		 3456 struct ifaddrmsg *ifm;
3457 struct nlattr *tb[IFA_MAX+1];
1da177e4 3458 struct in6_addr *pfx;
7198f8ce
TG		 3459 struct inet6_ifaddr *ifa;
3460 struct net_device *dev;
55ebaef1
NT		 3461 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3462 u8 ifa_flags;
461d8837 3463 int err;
1da177e4 3464
461d8837
TG		 3465 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3466 if (err < 0)
3467 return err;
3468
3469 ifm = nlmsg_data(nlh);
3470 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3471 if (pfx == NULL)
3472 return -EINVAL;
3473
461d8837 3474 if (tb[IFA_CACHEINFO]) {
0778769d 3475 struct ifa_cacheinfo *ci;
461d8837
TG		 3476
3477 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3478 valid_lft = ci->ifa_valid;
461d8837
TG		 3479 preferred_lft = ci->ifa_prefered;
3480 } else {
3481 preferred_lft = INFINITY_LIFE_TIME;
3482 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3483 }
3484
af284937 3485 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3486 if (dev == NULL)
3487 return -ENODEV;
3488
55ebaef1 3489 /* We ignore other flags so far. */
3b9f9a1c 3490 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3491
1cab3da6 3492 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3493 if (ifa == NULL) {
3494 /*
3495 * It would be best to check for !NLM_F_CREATE here but
3496 * userspace alreay relies on not having to provide this.
3497 */
af284937
DL		 3498 return inet6_addr_add(net, ifm->ifa_index, pfx,
3499 ifm->ifa_prefixlen, ifa_flags,
3500 preferred_lft, valid_lft);
081bba5b
NT		 3501 }
3502
7198f8ce
TG		 3503 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3504 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3505 err = -EEXIST;
3506 else
55ebaef1 3507 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3508
3509 in6_ifa_put(ifa);
3510
3511 return err;
1da177e4
LT		 3512}
3513
101bb229
TG		 3514static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3515 u8 scope, int ifindex)
3516{
3517 struct ifaddrmsg *ifm;
3518
3519 ifm = nlmsg_data(nlh);
3520 ifm->ifa_family = AF_INET6;
3521 ifm->ifa_prefixlen = prefixlen;
3522 ifm->ifa_flags = flags;
3523 ifm->ifa_scope = scope;
3524 ifm->ifa_index = ifindex;
3525}
3526
85486af0
TG		 3527static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3528 unsigned long tstamp, u32 preferred, u32 valid)
3529{
3530 struct ifa_cacheinfo ci;
3531
18a31e1e
TG		 3532 ci.cstamp = cstamp_delta(cstamp);
3533 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3534 ci.ifa_prefered = preferred;
3535 ci.ifa_valid = valid;
3536
3537 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3538}
3539
101bb229
TG		 3540static inline int rt_scope(int ifa_scope)
3541{
3542 if (ifa_scope & IFA_HOST)
3543 return RT_SCOPE_HOST;
3544 else if (ifa_scope & IFA_LINK)
3545 return RT_SCOPE_LINK;
3546 else if (ifa_scope & IFA_SITE)
3547 return RT_SCOPE_SITE;
3548 else
3549 return RT_SCOPE_UNIVERSE;
3550}
3551
0ab6803b
TG		 3552static inline int inet6_ifaddr_msgsize(void)
3553{
339bf98f
TG		 3554 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3555 + nla_total_size(16) /* IFA_ADDRESS */
3556 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3557}
c5396a31 3558
1da177e4 3559static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3560 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3561{
1da177e4 3562 struct nlmsghdr *nlh;
85486af0 3563 u32 preferred, valid;
1da177e4 3564
0ab6803b
TG		 3565 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3566 if (nlh == NULL)
26932566 3567 return -EMSGSIZE;
0ab6803b 3568
101bb229
TG		 3569 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3570 ifa->idev->dev->ifindex);
3571
1da177e4 3572 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3573 preferred = ifa->prefered_lft;
3574 valid = ifa->valid_lft;
3575 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3576 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3577 if (preferred > tval)
3578 preferred -= tval;
3579 else
3580 preferred = 0;
f56619fc
BH		 3581 if (valid != INFINITY_LIFE_TIME) {
3582 if (valid > tval)
3583 valid -= tval;
3584 else
3585 valid = 0;
3586 }
1da177e4
LT		 3587 }
3588 } else {
85486af0
TG		 3589 preferred = INFINITY_LIFE_TIME;
3590 valid = INFINITY_LIFE_TIME;
3591 }
3592
0ab6803b 3593 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3594 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3595 nlmsg_cancel(skb, nlh);
3596 return -EMSGSIZE;
3597 }
1da177e4 3598
0ab6803b 3599 return nlmsg_end(skb, nlh);
1da177e4
LT		 3600}
3601
3602static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3603 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3604{
1da177e4 3605 struct nlmsghdr *nlh;
101bb229
TG		 3606 u8 scope = RT_SCOPE_UNIVERSE;
3607 int ifindex = ifmca->idev->dev->ifindex;
3608
3609 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3610 scope = RT_SCOPE_SITE;
1da177e4 3611
0ab6803b
TG		 3612 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3613 if (nlh == NULL)
26932566 3614 return -EMSGSIZE;
85486af0 3615
0ab6803b
TG		 3616 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3617 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3618 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3619 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3620 nlmsg_cancel(skb, nlh);
3621 return -EMSGSIZE;
3622 }
85486af0 3623
0ab6803b 3624 return nlmsg_end(skb, nlh);
1da177e4
LT		 3625}
3626
3627static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3628 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3629{
1da177e4 3630 struct nlmsghdr *nlh;
101bb229
TG		 3631 u8 scope = RT_SCOPE_UNIVERSE;
3632 int ifindex = ifaca->aca_idev->dev->ifindex;
3633
3634 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3635 scope = RT_SCOPE_SITE;
1da177e4 3636
0ab6803b
TG		 3637 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3638 if (nlh == NULL)
26932566 3639 return -EMSGSIZE;
85486af0 3640
0ab6803b
TG		 3641 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3642 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3643 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3644 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3645 nlmsg_cancel(skb, nlh);
3646 return -EMSGSIZE;
3647 }
1da177e4 3648
0ab6803b 3649 return nlmsg_end(skb, nlh);
1da177e4
LT		 3650}
3651
e21e8467 3652enum addr_type_t {
1da177e4
LT		 3653 UNICAST_ADDR,
3654 MULTICAST_ADDR,
3655 ANYCAST_ADDR,
3656};
3657
234b27c3
ED		 3658/* called with rcu_read_lock() */
3659static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3660 struct netlink_callback *cb, enum addr_type_t type,
3661 int s_ip_idx, int *p_ip_idx)
3662{
234b27c3
ED		 3663 struct ifmcaddr6 *ifmca;
3664 struct ifacaddr6 *ifaca;
3665 int err = 1;
3666 int ip_idx = *p_ip_idx;
3667
3668 read_lock_bh(&idev->lock);
3669 switch (type) {
502a2ffd 3670 case UNICAST_ADDR: {
3671 struct inet6_ifaddr *ifa;
3672
234b27c3 3673 /* unicast address incl. temp addr */
502a2ffd 3674 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3675 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3676 continue;
3677 err = inet6_fill_ifaddr(skb, ifa,
3678 NETLINK_CB(cb->skb).pid,
3679 cb->nlh->nlmsg_seq,
3680 RTM_NEWADDR,
3681 NLM_F_MULTI);
3682 if (err <= 0)
3683 break;
3684 }
3685 break;
502a2ffd 3686 }
234b27c3
ED		 3687 case MULTICAST_ADDR:
3688 /* multicast address */
3689 for (ifmca = idev->mc_list; ifmca;
3690 ifmca = ifmca->next, ip_idx++) {
3691 if (ip_idx < s_ip_idx)
3692 continue;
3693 err = inet6_fill_ifmcaddr(skb, ifmca,
3694 NETLINK_CB(cb->skb).pid,
3695 cb->nlh->nlmsg_seq,
3696 RTM_GETMULTICAST,
3697 NLM_F_MULTI);
3698 if (err <= 0)
3699 break;
3700 }
3701 break;
3702 case ANYCAST_ADDR:
3703 /* anycast address */
3704 for (ifaca = idev->ac_list; ifaca;
3705 ifaca = ifaca->aca_next, ip_idx++) {
3706 if (ip_idx < s_ip_idx)
3707 continue;
3708 err = inet6_fill_ifacaddr(skb, ifaca,
3709 NETLINK_CB(cb->skb).pid,
3710 cb->nlh->nlmsg_seq,
3711 RTM_GETANYCAST,
3712 NLM_F_MULTI);
3713 if (err <= 0)
3714 break;
3715 }
3716 break;
3717 default:
3718 break;
3719 }
3720 read_unlock_bh(&idev->lock);
3721 *p_ip_idx = ip_idx;
3722 return err;
3723}
3724
1da177e4
LT		 3725static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3726 enum addr_type_t type)
3727{
234b27c3
ED		 3728 struct net *net = sock_net(skb->sk);
3729 int h, s_h;
1da177e4
LT		 3730 int idx, ip_idx;
3731 int s_idx, s_ip_idx;
1da177e4 3732 struct net_device *dev;
234b27c3
ED		 3733 struct inet6_dev *idev;
3734 struct hlist_head *head;
3735 struct hlist_node *node;
1ab1457c 3736
234b27c3
ED		 3737 s_h = cb->args[0];
3738 s_idx = idx = cb->args[1];
3739 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3740
234b27c3
ED		 3741 rcu_read_lock();
3742 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3743 idx = 0;
3744 head = &net->dev_index_head[h];
3745 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3746 if (idx < s_idx)
3747 goto cont;
4b97efdf 3748 if (h > s_h || idx > s_idx)
234b27c3
ED		 3749 s_ip_idx = 0;
3750 ip_idx = 0;
e21e8467
SH		 3751 idev = __in6_dev_get(dev);
3752 if (!idev)
234b27c3
ED		 3753 goto cont;
3754
3755 if (in6_dump_addrs(idev, skb, cb, type,
3756 s_ip_idx, &ip_idx) <= 0)
3757 goto done;
7562f876 3758cont:
234b27c3
ED		 3759 idx++;
3760 }
1da177e4 3761 }
234b27c3
ED		 3762done:
3763 rcu_read_unlock();
3764 cb->args[0] = h;
3765 cb->args[1] = idx;
3766 cb->args[2] = ip_idx;
3767
1da177e4
LT		 3768 return skb->len;
3769}
3770
3771static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3772{
3773 enum addr_type_t type = UNICAST_ADDR;
b854272b 3774
1da177e4
LT		 3775 return inet6_dump_addr(skb, cb, type);
3776}
3777
3778static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3779{
3780 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3781
1da177e4
LT		 3782 return inet6_dump_addr(skb, cb, type);
3783}
3784
3785
3786static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3787{
3788 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3789
1da177e4
LT		 3790 return inet6_dump_addr(skb, cb, type);
3791}
3792
8e5e8f30 3793static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3794 void *arg)
6c223828 3795{
3b1e0a65 3796 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3797 struct ifaddrmsg *ifm;
3798 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3799 struct in6_addr *addr = NULL;
3800 struct net_device *dev = NULL;
3801 struct inet6_ifaddr *ifa;
3802 struct sk_buff *skb;
6c223828
NT		 3803 int err;
3804
1b29fc2c
TG		 3805 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3806 if (err < 0)
3807 goto errout;
3808
3809 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3810 if (addr == NULL) {
3811 err = -EINVAL;
3812 goto errout;
6c223828 3813 }
6c223828 3814
1b29fc2c 3815 ifm = nlmsg_data(nlh);
6c223828 3816 if (ifm->ifa_index)
6fda7350 3817 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3818
e21e8467
SH		 3819 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3820 if (!ifa) {
1b29fc2c
TG		 3821 err = -EADDRNOTAVAIL;
3822 goto errout;
3823 }
6c223828 3824
e21e8467
SH		 3825 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3826 if (!skb) {
6c223828 3827 err = -ENOBUFS;
1b29fc2c 3828 goto errout_ifa;
6c223828
NT		 3829 }
3830
6c223828
NT		 3831 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3832 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3833 if (err < 0) {
3834 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3835 WARN_ON(err == -EMSGSIZE);
3836 kfree_skb(skb);
3837 goto errout_ifa;
3838 }
6fda7350 3839 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3840errout_ifa:
6c223828 3841 in6_ifa_put(ifa);
1b29fc2c 3842errout:
6c223828 3843 return err;
6c223828
NT		 3844}
3845
1da177e4
LT		 3846static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3847{
3848 struct sk_buff *skb;
c346dca1 3849 struct net *net = dev_net(ifa->idev->dev);
5d620266 3850 int err = -ENOBUFS;
1da177e4 3851
0ab6803b 3852 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3853 if (skb == NULL)
3854 goto errout;
3855
3856 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3857 if (err < 0) {
3858 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3859 WARN_ON(err == -EMSGSIZE);
3860 kfree_skb(skb);
3861 goto errout;
3862 }
1ce85fe4
PNA		 3863 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3864 return;
5d620266
TG		 3865errout:
3866 if (err < 0)
6fda7350 3867 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3868}
3869
b6f99a21 3870static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3871 __s32 *array, int bytes)
3872{
04561c1f
TG		 3873 BUG_ON(bytes < (DEVCONF_MAX * 4));
3874
1da177e4
LT		 3875 memset(array, 0, bytes);
3876 array[DEVCONF_FORWARDING] = cnf->forwarding;
3877 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3878 array[DEVCONF_MTU6] = cnf->mtu6;
3879 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3880 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3881 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3882 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3883 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3884 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3885 jiffies_to_msecs(cnf->rtr_solicit_interval);
3886 array[DEVCONF_RTR_SOLICIT_DELAY] =
3887 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3888 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3889#ifdef CONFIG_IPV6_PRIVACY
3890 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3891 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3892 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3893 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3894 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3895#endif
3896 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3897 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3898 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3899#ifdef CONFIG_IPV6_ROUTER_PREF
3900 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3901 array[DEVCONF_RTR_PROBE_INTERVAL] =
3902 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3903#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3904 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3905#endif
930d6ff2 3906#endif
fbea49e1 3907 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3908 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3909#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3910 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3911#endif
7bc570c8
YH		 3912#ifdef CONFIG_IPV6_MROUTE
3913 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3914#endif
778d80be 3915 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3916 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3917 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3918}
3919
b382b191
TG		 3920static inline size_t inet6_ifla6_size(void)
3921{
3922 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3923 + nla_total_size(sizeof(struct ifla_cacheinfo))
3924 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3925 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3926 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3927}
3928
339bf98f
TG		 3929static inline size_t inet6_if_nlmsg_size(void)
3930{
3931 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3932 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3933 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3934 + nla_total_size(4) /* IFLA_MTU */
3935 + nla_total_size(4) /* IFLA_LINK */
b382b191 3936 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3937}
c5396a31 3938
be281e55 3939static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 3940 int items, int bytes)
7f7d9a6b
HX		 3941{
3942 int i;
3943 int pad = bytes - sizeof(u64) * items;
3944 BUG_ON(pad < 0);
3945
3946 /* Use put_unaligned() because stats may not be aligned for u64. */
3947 put_unaligned(items, &stats[0]);
3948 for (i = 1; i < items; i++)
be281e55 3949 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 3950
3951 memset(&stats[items], 0, pad);
3952}
3953
4ce3c183
ED		 3954static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3955 int items, int bytes, size_t syncpoff)
3956{
3957 int i;
3958 int pad = bytes - sizeof(u64) * items;
3959 BUG_ON(pad < 0);
3960
3961 /* Use put_unaligned() because stats may not be aligned for u64. */
3962 put_unaligned(items, &stats[0]);
3963 for (i = 1; i < items; i++)
3964 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3965
3966 memset(&stats[items], 0, pad);
3967}
3968
7f7d9a6b
HX		 3969static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3970 int bytes)
3971{
e21e8467 3972 switch (attrtype) {
7f7d9a6b 3973 case IFLA_INET6_STATS:
4ce3c183
ED		 3974 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3975 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3976 break;
3977 case IFLA_INET6_ICMP6STATS:
be281e55 3978 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3979 break;
3980 }
3981}
3982
b382b191
TG		 3983static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3984{
3985 struct nlattr *nla;
3986 struct ifla_cacheinfo ci;
3987
c78679e8
DM		 3988 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3989 goto nla_put_failure;
b382b191 3990 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 3991 ci.tstamp = cstamp_delta(idev->tstamp);
3992 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3993 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 3994 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3995 goto nla_put_failure;
b382b191
TG		 3996 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3997 if (nla == NULL)
3998 goto nla_put_failure;
3999 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4000
4001 /* XXX - MC not implemented */
4002
4003 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4004 if (nla == NULL)
4005 goto nla_put_failure;
4006 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4007
4008 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4009 if (nla == NULL)
4010 goto nla_put_failure;
4011 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4012
4013 return 0;
4014
4015nla_put_failure:
4016 return -EMSGSIZE;
4017}
4018
4019static size_t inet6_get_link_af_size(const struct net_device *dev)
4020{
4021 if (!__in6_dev_get(dev))
4022 return 0;
4023
4024 return inet6_ifla6_size();
4025}
4026
4027static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4028{
4029 struct inet6_dev *idev = __in6_dev_get(dev);
4030
4031 if (!idev)
4032 return -ENODATA;
4033
4034 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4035 return -EMSGSIZE;
4036
4037 return 0;
4038}
4039
1ab1457c 4040static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 4041 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 4042{
04561c1f 4043 struct net_device *dev = idev->dev;
04561c1f
TG		 4044 struct ifinfomsg *hdr;
4045 struct nlmsghdr *nlh;
4046 void *protoinfo;
04561c1f
TG		 4047
4048 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4049 if (nlh == NULL)
26932566 4050 return -EMSGSIZE;
04561c1f
TG		 4051
4052 hdr = nlmsg_data(nlh);
4053 hdr->ifi_family = AF_INET6;
4054 hdr->__ifi_pad = 0;
4055 hdr->ifi_type = dev->type;
4056 hdr->ifi_index = dev->ifindex;
4057 hdr->ifi_flags = dev_get_flags(dev);
4058 hdr->ifi_change = 0;
4059
c78679e8
DM		 4060 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4061 (dev->addr_len &&
4062 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4063 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4064 (dev->ifindex != dev->iflink &&
4065 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4066 goto nla_put_failure;
04561c1f
TG		 4067 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4068 if (protoinfo == NULL)
4069 goto nla_put_failure;
1da177e4 4070
b382b191 4071 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4072 goto nla_put_failure;
1da177e4 4073
04561c1f
TG		 4074 nla_nest_end(skb, protoinfo);
4075 return nlmsg_end(skb, nlh);
1da177e4 4076
04561c1f 4077nla_put_failure:
26932566
PM		 4078 nlmsg_cancel(skb, nlh);
4079 return -EMSGSIZE;
1da177e4
LT		 4080}
4081
4082static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4083{
3b1e0a65 4084 struct net *net = sock_net(skb->sk);
84d2697d 4085 int h, s_h;
434a8a58 4086 int idx = 0, s_idx;
1da177e4
LT		 4087 struct net_device *dev;
4088 struct inet6_dev *idev;
84d2697d
ED		 4089 struct hlist_head *head;
4090 struct hlist_node *node;
1da177e4 4091
84d2697d
ED		 4092 s_h = cb->args[0];
4093 s_idx = cb->args[1];
4094
4095 rcu_read_lock();
4096 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4097 idx = 0;
4098 head = &net->dev_index_head[h];
4099 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4100 if (idx < s_idx)
4101 goto cont;
4102 idev = __in6_dev_get(dev);
4103 if (!idev)
4104 goto cont;
4105 if (inet6_fill_ifinfo(skb, idev,
4106 NETLINK_CB(cb->skb).pid,
4107 cb->nlh->nlmsg_seq,
4108 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4109 goto out;
7562f876 4110cont:
84d2697d
ED		 4111 idx++;
4112 }
1da177e4 4113 }
84d2697d
ED		 4114out:
4115 rcu_read_unlock();
4116 cb->args[1] = idx;
4117 cb->args[0] = h;
1da177e4
LT		 4118
4119 return skb->len;
4120}
4121
4122void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4123{
4124 struct sk_buff *skb;
c346dca1 4125 struct net *net = dev_net(idev->dev);
8d7a76c9 4126 int err = -ENOBUFS;
1ab1457c 4127
339bf98f 4128 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4129 if (skb == NULL)
4130 goto errout;
4131
4132 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4133 if (err < 0) {
4134 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4135 WARN_ON(err == -EMSGSIZE);
4136 kfree_skb(skb);
4137 goto errout;
4138 }
5f75a104 4139 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4140 return;
8d7a76c9
TG		 4141errout:
4142 if (err < 0)
5f75a104 4143 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4144}
4145
339bf98f
TG		 4146static inline size_t inet6_prefix_nlmsg_size(void)
4147{
4148 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4149 + nla_total_size(sizeof(struct in6_addr))
4150 + nla_total_size(sizeof(struct prefix_cacheinfo));
4151}
c5396a31 4152
1da177e4 4153static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4154 struct prefix_info *pinfo, u32 pid, u32 seq,
4155 int event, unsigned int flags)
1da177e4 4156{
6051e2f4
TG		 4157 struct prefixmsg *pmsg;
4158 struct nlmsghdr *nlh;
1da177e4
LT		 4159 struct prefix_cacheinfo ci;
4160
6051e2f4
TG		 4161 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4162 if (nlh == NULL)
26932566 4163 return -EMSGSIZE;
6051e2f4
TG		 4164
4165 pmsg = nlmsg_data(nlh);
1da177e4 4166 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4167 pmsg->prefix_pad1 = 0;
4168 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4169 pmsg->prefix_ifindex = idev->dev->ifindex;
4170 pmsg->prefix_len = pinfo->prefix_len;
4171 pmsg->prefix_type = pinfo->type;
8a47077a 4172 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4173 pmsg->prefix_flags = 0;
4174 if (pinfo->onlink)
4175 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4176 if (pinfo->autoconf)
4177 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4178
c78679e8
DM		 4179 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4180 goto nla_put_failure;
1da177e4
LT		 4181 ci.preferred_time = ntohl(pinfo->prefered);
4182 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4183 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4184 goto nla_put_failure;
6051e2f4 4185 return nlmsg_end(skb, nlh);
1da177e4 4186
6051e2f4 4187nla_put_failure:
26932566
PM		 4188 nlmsg_cancel(skb, nlh);
4189 return -EMSGSIZE;
1da177e4
LT		 4190}
4191
1ab1457c 4192static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4193 struct prefix_info *pinfo)
4194{
4195 struct sk_buff *skb;
c346dca1 4196 struct net *net = dev_net(idev->dev);
8c384bfa 4197 int err = -ENOBUFS;
1da177e4 4198
339bf98f 4199 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4200 if (skb == NULL)
4201 goto errout;
4202
4203 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4204 if (err < 0) {
4205 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4206 WARN_ON(err == -EMSGSIZE);
4207 kfree_skb(skb);
4208 goto errout;
4209 }
1ce85fe4
PNA		 4210 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4211 return;
8c384bfa
TG		 4212errout:
4213 if (err < 0)
6fda7350 4214 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4215}
4216
1da177e4
LT		 4217static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4218{
4219 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4220
4221 switch (event) {
4222 case RTM_NEWADDR:
95c385b4
NH		 4223 /*
4224 * If the address was optimistic
4225 * we inserted the route at the start of
4226 * our DAD process, so we don't need
4227 * to do it again
4228 */
4229 if (!(ifp->rt->rt6i_node))
4230 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4231 if (ifp->idev->cnf.forwarding)
4232 addrconf_join_anycast(ifp);
4233 break;
4234 case RTM_DELADDR:
4235 if (ifp->idev->cnf.forwarding)
4236 addrconf_leave_anycast(ifp);
4237 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4238 dst_hold(&ifp->rt->dst);
93fa159a 4239
73a8bd74 4240 if (ip6_del_rt(ifp->rt))
d8d1f30b 4241 dst_free(&ifp->rt->dst);
1da177e4
LT		 4242 break;
4243 }
4244}
4245
4246static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4247{
8814c4b5 4248 rcu_read_lock_bh();
1da177e4
LT		 4249 if (likely(ifp->idev->dead == 0))
4250 __ipv6_ifa_notify(event, ifp);
8814c4b5 4251 rcu_read_unlock_bh();
1da177e4
LT		 4252}
4253
4254#ifdef CONFIG_SYSCTL
4255
4256static
8d65af78 4257int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4258 void __user *buffer, size_t *lenp, loff_t *ppos)
4259{
4260 int *valp = ctl->data;
4261 int val = *valp;
88af182e 4262 loff_t pos = *ppos;
013d97e9 4263 ctl_table lctl;
1da177e4
LT		 4264 int ret;
4265
013d97e9
FR		 4266 /*
4267 * ctl->data points to idev->cnf.forwarding, we should
4268 * not modify it until we get the rtnl lock.
4269 */
4270 lctl = *ctl;
4271 lctl.data = &val;
4272
4273 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4274
c8fecf22 4275 if (write)
b325fddb 4276 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4277 if (ret)
4278 *ppos = pos;
1ab1457c 4279 return ret;
1da177e4
LT		 4280}
4281
56d417b1
BH		 4282static void dev_disable_change(struct inet6_dev *idev)
4283{
4284 if (!idev || !idev->dev)
4285 return;
4286
4287 if (idev->cnf.disable_ipv6)
4288 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4289 else
4290 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4291}
4292
4293static void addrconf_disable_change(struct net *net, __s32 newf)
4294{
4295 struct net_device *dev;
4296 struct inet6_dev *idev;
4297
c6d14c84
ED		 4298 rcu_read_lock();
4299 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4300 idev = __in6_dev_get(dev);
4301 if (idev) {
4302 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4303 idev->cnf.disable_ipv6 = newf;
4304 if (changed)
4305 dev_disable_change(idev);
4306 }
56d417b1 4307 }
c6d14c84 4308 rcu_read_unlock();
56d417b1
BH		 4309}
4310
013d97e9 4311static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4312{
4313 struct net *net;
013d97e9
FR		 4314 int old;
4315
4316 if (!rtnl_trylock())
4317 return restart_syscall();
56d417b1
BH		 4318
4319 net = (struct net *)table->extra2;
013d97e9
FR		 4320 old = *p;
4321 *p = newf;
56d417b1 4322
013d97e9
FR		 4323 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4324 rtnl_unlock();
56d417b1 4325 return 0;
88af182e 4326 }
56d417b1
BH		 4327
4328 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4329 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4330 addrconf_disable_change(net, newf);
013d97e9 4331 } else if ((!newf) ^ (!old))
56d417b1
BH		 4332 dev_disable_change((struct inet6_dev *)table->extra1);
4333
4334 rtnl_unlock();
4335 return 0;
4336}
4337
4338static
8d65af78 4339int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4340 void __user *buffer, size_t *lenp, loff_t *ppos)
4341{
4342 int *valp = ctl->data;
4343 int val = *valp;
88af182e 4344 loff_t pos = *ppos;
013d97e9 4345 ctl_table lctl;
56d417b1
BH		 4346 int ret;
4347
013d97e9
FR		 4348 /*
4349 * ctl->data points to idev->cnf.disable_ipv6, we should
4350 * not modify it until we get the rtnl lock.
4351 */
4352 lctl = *ctl;
4353 lctl.data = &val;
4354
4355 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4356
4357 if (write)
4358 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4359 if (ret)
4360 *ppos = pos;
56d417b1
BH		 4361 return ret;
4362}
4363
1da177e4
LT		 4364static struct addrconf_sysctl_table
4365{
4366 struct ctl_table_header *sysctl_header;
f6a07b29 4367 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4368 char *dev_name;
ab32ea5d 4369} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4370 .sysctl_header = NULL,
4371 .addrconf_vars = {
1ab1457c 4372 {
e21e8467
SH		 4373 .procname = "forwarding",
4374 .data = &ipv6_devconf.forwarding,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4378 },
4379 {
e21e8467
SH		 4380 .procname = "hop_limit",
4381 .data = &ipv6_devconf.hop_limit,
4382 .maxlen = sizeof(int),
4383 .mode = 0644,
4384 .proc_handler = proc_dointvec,
1da177e4
LT		 4385 },
4386 {
e21e8467
SH		 4387 .procname = "mtu",
4388 .data = &ipv6_devconf.mtu6,
4389 .maxlen = sizeof(int),
4390 .mode = 0644,
4391 .proc_handler = proc_dointvec,
1da177e4
LT		 4392 },
4393 {
e21e8467
SH		 4394 .procname = "accept_ra",
4395 .data = &ipv6_devconf.accept_ra,
4396 .maxlen = sizeof(int),
4397 .mode = 0644,
4398 .proc_handler = proc_dointvec,
1da177e4
LT		 4399 },
4400 {
e21e8467
SH		 4401 .procname = "accept_redirects",
4402 .data = &ipv6_devconf.accept_redirects,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec,
1da177e4
LT		 4406 },
4407 {
e21e8467
SH		 4408 .procname = "autoconf",
4409 .data = &ipv6_devconf.autoconf,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec,
1da177e4
LT		 4413 },
4414 {
e21e8467
SH		 4415 .procname = "dad_transmits",
4416 .data = &ipv6_devconf.dad_transmits,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
1da177e4
LT		 4420 },
4421 {
e21e8467
SH		 4422 .procname = "router_solicitations",
4423 .data = &ipv6_devconf.rtr_solicits,
4424 .maxlen = sizeof(int),
4425 .mode = 0644,
4426 .proc_handler = proc_dointvec,
1da177e4
LT		 4427 },
4428 {
e21e8467
SH		 4429 .procname = "router_solicitation_interval",
4430 .data = &ipv6_devconf.rtr_solicit_interval,
4431 .maxlen = sizeof(int),
4432 .mode = 0644,
4433 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4434 },
4435 {
e21e8467
SH		 4436 .procname = "router_solicitation_delay",
4437 .data = &ipv6_devconf.rtr_solicit_delay,
4438 .maxlen = sizeof(int),
4439 .mode = 0644,
4440 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4441 },
4442 {
e21e8467
SH		 4443 .procname = "force_mld_version",
4444 .data = &ipv6_devconf.force_mld_version,
4445 .maxlen = sizeof(int),
4446 .mode = 0644,
4447 .proc_handler = proc_dointvec,
1da177e4
LT		 4448 },
4449#ifdef CONFIG_IPV6_PRIVACY
4450 {
e21e8467
SH		 4451 .procname = "use_tempaddr",
4452 .data = &ipv6_devconf.use_tempaddr,
4453 .maxlen = sizeof(int),
4454 .mode = 0644,
4455 .proc_handler = proc_dointvec,
1da177e4
LT		 4456 },
4457 {
e21e8467
SH		 4458 .procname = "temp_valid_lft",
4459 .data = &ipv6_devconf.temp_valid_lft,
4460 .maxlen = sizeof(int),
4461 .mode = 0644,
4462 .proc_handler = proc_dointvec,
1da177e4
LT		 4463 },
4464 {
e21e8467
SH		 4465 .procname = "temp_prefered_lft",
4466 .data = &ipv6_devconf.temp_prefered_lft,
4467 .maxlen = sizeof(int),
4468 .mode = 0644,
4469 .proc_handler = proc_dointvec,
1da177e4
LT		 4470 },
4471 {
e21e8467
SH		 4472 .procname = "regen_max_retry",
4473 .data = &ipv6_devconf.regen_max_retry,
4474 .maxlen = sizeof(int),
4475 .mode = 0644,
4476 .proc_handler = proc_dointvec,
1da177e4
LT		 4477 },
4478 {
e21e8467
SH		 4479 .procname = "max_desync_factor",
4480 .data = &ipv6_devconf.max_desync_factor,
4481 .maxlen = sizeof(int),
4482 .mode = 0644,
4483 .proc_handler = proc_dointvec,
1da177e4
LT		 4484 },
4485#endif
4486 {
e21e8467
SH		 4487 .procname = "max_addresses",
4488 .data = &ipv6_devconf.max_addresses,
4489 .maxlen = sizeof(int),
4490 .mode = 0644,
4491 .proc_handler = proc_dointvec,
1da177e4 4492 },
65f5c7c1 4493 {
e21e8467
SH		 4494 .procname = "accept_ra_defrtr",
4495 .data = &ipv6_devconf.accept_ra_defrtr,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec,
65f5c7c1 4499 },
c4fd30eb 4500 {
e21e8467
SH		 4501 .procname = "accept_ra_pinfo",
4502 .data = &ipv6_devconf.accept_ra_pinfo,
4503 .maxlen = sizeof(int),
4504 .mode = 0644,
4505 .proc_handler = proc_dointvec,
c4fd30eb 4506 },
930d6ff2
YH		 4507#ifdef CONFIG_IPV6_ROUTER_PREF
4508 {
e21e8467
SH		 4509 .procname = "accept_ra_rtr_pref",
4510 .data = &ipv6_devconf.accept_ra_rtr_pref,
4511 .maxlen = sizeof(int),
4512 .mode = 0644,
4513 .proc_handler = proc_dointvec,
930d6ff2 4514 },
52e16356 4515 {
e21e8467
SH		 4516 .procname = "router_probe_interval",
4517 .data = &ipv6_devconf.rtr_probe_interval,
4518 .maxlen = sizeof(int),
4519 .mode = 0644,
4520 .proc_handler = proc_dointvec_jiffies,
52e16356 4521 },
fa03ef38 4522#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4523 {
e21e8467
SH		 4524 .procname = "accept_ra_rt_info_max_plen",
4525 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4526 .maxlen = sizeof(int),
4527 .mode = 0644,
4528 .proc_handler = proc_dointvec,
09c884d4
YH		 4529 },
4530#endif
930d6ff2 4531#endif
fbea49e1 4532 {
e21e8467
SH		 4533 .procname = "proxy_ndp",
4534 .data = &ipv6_devconf.proxy_ndp,
4535 .maxlen = sizeof(int),
4536 .mode = 0644,
4537 .proc_handler = proc_dointvec,
fbea49e1 4538 },
0bcbc926 4539 {
e21e8467
SH		 4540 .procname = "accept_source_route",
4541 .data = &ipv6_devconf.accept_source_route,
4542 .maxlen = sizeof(int),
4543 .mode = 0644,
4544 .proc_handler = proc_dointvec,
0bcbc926 4545 },
95c385b4
NH		 4546#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4547 {
e21e8467
SH		 4548 .procname = "optimistic_dad",
4549 .data = &ipv6_devconf.optimistic_dad,
4550 .maxlen = sizeof(int),
4551 .mode = 0644,
4552 .proc_handler = proc_dointvec,
95c385b4
NH		 4553
4554 },
7bc570c8
YH		 4555#endif
4556#ifdef CONFIG_IPV6_MROUTE
4557 {
e21e8467
SH		 4558 .procname = "mc_forwarding",
4559 .data = &ipv6_devconf.mc_forwarding,
4560 .maxlen = sizeof(int),
4561 .mode = 0444,
4562 .proc_handler = proc_dointvec,
7bc570c8 4563 },
95c385b4 4564#endif
778d80be 4565 {
e21e8467
SH		 4566 .procname = "disable_ipv6",
4567 .data = &ipv6_devconf.disable_ipv6,
4568 .maxlen = sizeof(int),
4569 .mode = 0644,
4570 .proc_handler = addrconf_sysctl_disable,
778d80be 4571 },
1b34be74 4572 {
e21e8467
SH		 4573 .procname = "accept_dad",
4574 .data = &ipv6_devconf.accept_dad,
4575 .maxlen = sizeof(int),
4576 .mode = 0644,
4577 .proc_handler = proc_dointvec,
1b34be74 4578 },
f7734fdf 4579 {
f7734fdf
OP		 4580 .procname = "force_tllao",
4581 .data = &ipv6_devconf.force_tllao,
4582 .maxlen = sizeof(int),
4583 .mode = 0644,
4584 .proc_handler = proc_dointvec
4585 },
1da177e4 4586 {
f8572d8f 4587 /* sentinel */
1da177e4
LT		 4588 }
4589 },
1da177e4
LT		 4590};
4591
bff16c2f 4592static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4593 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4594{
4595 int i;
1da177e4 4596 struct addrconf_sysctl_table *t;
1da177e4 4597
1dab6222
PE		 4598#define ADDRCONF_CTL_PATH_DEV 3
4599
4600 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4601 { .procname = "net", },
4602 { .procname = "ipv6", },
4603 { .procname = "conf", },
1dab6222
PE		 4604 { /* to be set */ },
4605 { },
4606 };
4607
4608
af879cc7 4609 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4610 if (t == NULL)
f68635e6
PE		 4611 goto out;
4612
bcdd553f 4613 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4614 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4615 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4616 t->addrconf_vars[i].extra2 = net;
1da177e4 4617 }
1da177e4 4618
1ab1457c
YH		 4619 /*
4620 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4621 * by sysctl and we wouldn't want anyone to change it under our feet
4622 * (see SIOCSIFNAME).
1ab1457c 4623 */
1dab6222
PE		 4624 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4625 if (!t->dev_name)
f68635e6 4626 goto free;
1da177e4 4627
1dab6222 4628 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4629
bff16c2f 4630 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4631 t->addrconf_vars);
1da177e4
LT		 4632 if (t->sysctl_header == NULL)
4633 goto free_procname;
f68635e6
PE		 4634
4635 p->sysctl = t;
95897312 4636 return 0;
1da177e4 4637
f68635e6 4638free_procname:
1dab6222 4639 kfree(t->dev_name);
f68635e6 4640free:
1da177e4 4641 kfree(t);
f68635e6 4642out:
95897312 4643 return -ENOBUFS;
1da177e4
LT		 4644}
4645
408c4768
PE		 4646static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4647{
4648 struct addrconf_sysctl_table *t;
4649
4650 if (p->sysctl == NULL)
4651 return;
4652
4653 t = p->sysctl;
4654 p->sysctl = NULL;
ff538818 4655 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4656 kfree(t->dev_name);
4657 kfree(t);
4658}
4659
f52295a9
PE		 4660static void addrconf_sysctl_register(struct inet6_dev *idev)
4661{
54716e3b 4662 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4663 &ndisc_ifinfo_sysctl_change);
c346dca1 4664 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4665 idev, &idev->cnf);
f52295a9
PE		 4666}
4667
408c4768 4668static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4669{
408c4768
PE		 4670 __addrconf_sysctl_unregister(&idev->cnf);
4671 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4672}
4673
4674
4675#endif
4676
2c8c1e72 4677static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4678{
4679 int err;
4680 struct ipv6_devconf *all, *dflt;
4681
4682 err = -ENOMEM;
4683 all = &ipv6_devconf;
4684 dflt = &ipv6_devconf_dflt;
4685
09ad9bc7 4686 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4687 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4688 if (all == NULL)
4689 goto err_alloc_all;
4690
4691 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4692 if (dflt == NULL)
4693 goto err_alloc_dflt;
56d417b1
BH		 4694 } else {
4695 /* these will be inherited by all namespaces */
4696 dflt->autoconf = ipv6_defaults.autoconf;
4697 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4698 }
4699
4700 net->ipv6.devconf_all = all;
4701 net->ipv6.devconf_dflt = dflt;
4702
4703#ifdef CONFIG_SYSCTL
f8572d8f 4704 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4705 if (err < 0)
4706 goto err_reg_all;
4707
f8572d8f 4708 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4709 if (err < 0)
4710 goto err_reg_dflt;
4711#endif
4712 return 0;
4713
4714#ifdef CONFIG_SYSCTL
4715err_reg_dflt:
4716 __addrconf_sysctl_unregister(all);
4717err_reg_all:
4718 kfree(dflt);
4719#endif
4720err_alloc_dflt:
4721 kfree(all);
4722err_alloc_all:
4723 return err;
4724}
4725
2c8c1e72 4726static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4727{
4728#ifdef CONFIG_SYSCTL
4729 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4730 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4731#endif
09ad9bc7 4732 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4733 kfree(net->ipv6.devconf_dflt);
4734 kfree(net->ipv6.devconf_all);
4735 }
4736}
4737
4738static struct pernet_operations addrconf_ops = {
4739 .init = addrconf_init_net,
4740 .exit = addrconf_exit_net,
4741};
4742
1da177e4
LT		 4743/*
4744 * Device notifier
4745 */
4746
4747int register_inet6addr_notifier(struct notifier_block *nb)
4748{
1ab1457c 4749 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4750}
7159039a
YH		 4751EXPORT_SYMBOL(register_inet6addr_notifier);
4752
1da177e4
LT		 4753int unregister_inet6addr_notifier(struct notifier_block *nb)
4754{
e21e8467 4755 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4756}
7159039a
YH		 4757EXPORT_SYMBOL(unregister_inet6addr_notifier);
4758
b382b191
TG		 4759static struct rtnl_af_ops inet6_ops = {
4760 .family = AF_INET6,
4761 .fill_link_af = inet6_fill_link_af,
4762 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4763};
4764
1da177e4
LT		 4765/*
4766 * Init / cleanup code
4767 */
4768
4769int __init addrconf_init(void)
4770{
c2e21293 4771 int i, err;
2a8cc6c8 4772
e21e8467
SH		 4773 err = ipv6_addr_label_init();
4774 if (err < 0) {
4775 printk(KERN_CRIT "IPv6 Addrconf:"
4776 " cannot initialize default policy table: %d.\n", err);
2cc6d2bf 4777 goto out;
2a8cc6c8 4778 }
1da177e4 4779
2cc6d2bf
NH		 4780 err = register_pernet_subsys(&addrconf_ops);
4781 if (err < 0)
4782 goto out_addrlabel;
e0da5a48 4783
1da177e4
LT		 4784 /* The addrconf netdev notifier requires that loopback_dev
4785 * has it's ipv6 private information allocated and setup
4786 * before it can bring up and give link-local addresses
4787 * to other devices which are up.
4788 *
4789 * Unfortunately, loopback_dev is not necessarily the first
4790 * entry in the global dev_base list of net devices. In fact,
4791 * it is likely to be the very last entry on that list.
4792 * So this causes the notifier registry below to try and
4793 * give link-local addresses to all devices besides loopback_dev
4794 * first, then loopback_dev, which cases all the non-loopback_dev
4795 * devices to fail to get a link-local address.
4796 *
4797 * So, as a temporary fix, allocate the ipv6 structure for
4798 * loopback_dev first by hand.
4799 * Longer term, all of the dependencies ipv6 has upon the loopback
4800 * device and it being up should be removed.
4801 */
4802 rtnl_lock();
2774c7ab 4803 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4804 err = -ENOMEM;
4805 rtnl_unlock();
4806 if (err)
e0da5a48 4807 goto errlo;
1da177e4 4808
c2e21293 4809 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4810 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4811
1da177e4
LT		 4812 register_netdevice_notifier(&ipv6_dev_notf);
4813
1da177e4 4814 addrconf_verify(0);
c127ea2c 4815
b382b191
TG		 4816 err = rtnl_af_register(&inet6_ops);
4817 if (err < 0)
4818 goto errout_af;
4819
c7ac8679
GR		 4820 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4821 NULL);
c127ea2c
TG		 4822 if (err < 0)
4823 goto errout;
4824
4825 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4826 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4827 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4828 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4829 inet6_dump_ifaddr, NULL);
4830 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4831 inet6_dump_ifmcaddr, NULL);
4832 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4833 inet6_dump_ifacaddr, NULL);
c127ea2c 4834
2a8cc6c8
YH		 4835 ipv6_addr_label_rtnl_register();
4836
1da177e4 4837 return 0;
c127ea2c 4838errout:
b382b191
TG		 4839 rtnl_af_unregister(&inet6_ops);
4840errout_af:
c127ea2c 4841 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4842errlo:
4843 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4844out_addrlabel:
4845 ipv6_addr_label_cleanup();
4846out:
c127ea2c 4847 return err;
1da177e4
LT		 4848}
4849
09f7709f 4850void addrconf_cleanup(void)
1da177e4 4851{
176c39af 4852 struct net_device *dev;
1da177e4
LT		 4853 int i;
4854
4855 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4856 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4857 ipv6_addr_label_cleanup();
1da177e4
LT		 4858
4859 rtnl_lock();
4860
b382b191
TG		 4861 __rtnl_af_unregister(&inet6_ops);
4862
176c39af
DL		 4863 /* clean dev list */
4864 for_each_netdev(&init_net, dev) {
4865 if (__in6_dev_get(dev) == NULL)
4866 continue;
4867 addrconf_ifdown(dev, 1);
4868 }
4869 addrconf_ifdown(init_net.loopback_dev, 2);
4870
1da177e4
LT		 4871 /*
4872 * Check hash table.
4873 */
5c578aed 4874 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4875 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4876 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4877 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4878
4879 del_timer(&addr_chk_timer);
1da177e4 4880 rtnl_unlock();
1da177e4 4881}
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