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can-gw: add netlink based CAN routing
[linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <[email protected]>
1da177e4
LT		 7 * Alexey Kuznetsov <[email protected]>
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 * <[email protected]>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 101
102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
1da177e4 106
b2db7564
YH		 107#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108#define ADDRCONF_TIMER_FUZZ (HZ / 4)
109#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
1da177e4 111#ifdef CONFIG_SYSCTL
f52295a9 112static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 113static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114#else
115static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116{
117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
1da177e4
LT		 122#endif
123
124#ifdef CONFIG_IPV6_PRIVACY
125static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 126static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 127static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 128#endif
129
1b34be74 130static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 131static int ipv6_count_addresses(struct inet6_dev *idev);
132
133/*
134 * Configured unicast address hash table
135 */
c2e21293 136static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 137static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 138
1da177e4
LT		 139static void addrconf_verify(unsigned long);
140
8d06afab 141static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 142static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
93d9b7d7
JP		 147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
1da177e4
LT		 149static int addrconf_ifdown(struct net_device *dev, int how);
150
e431b8c0 151static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 152static void addrconf_dad_timer(unsigned long data);
153static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 154static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 155static void addrconf_rs_timer(unsigned long data);
156static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
1ab1457c 159static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 160 struct prefix_info *pinfo);
3e81c6da
DM		 161static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
1da177e4 163
e041c683 164static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 165
888c848e 166static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178#ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184#endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 186 .accept_ra_defrtr = 1,
c4fd30eb 187 .accept_ra_pinfo = 1,
930d6ff2
YH		 188#ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
52e16356 190 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 191#ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193#endif
930d6ff2 194#endif
fbea49e1 195 .proxy_ndp = 0,
0bcbc926 196 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 197 .disable_ipv6 = 0,
1b34be74 198 .accept_dad = 1,
1da177e4
LT		 199};
200
ab32ea5d 201static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212#ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218#endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 220 .accept_ra_defrtr = 1,
c4fd30eb 221 .accept_ra_pinfo = 1,
930d6ff2
YH		 222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
52e16356 224 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
930d6ff2 228#endif
fbea49e1 229 .proxy_ndp = 0,
0bcbc926 230 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 231 .disable_ipv6 = 0,
1b34be74 232 .accept_dad = 1,
1da177e4
LT		 233};
234
235/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 236const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 237const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 238const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 240
f24e3d65 241/* Check if a valid qdisc is available */
05297949 242static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 243{
05297949 244 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 245}
246
2b5ead46
YH		 247/* Check if a route is valid prefix route */
248static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249{
a02cec21 250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 251}
252
1da177e4
LT		 253static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254{
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257}
258
e21e8467 259enum addrconf_timer_t {
1da177e4
LT		 260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263};
264
265static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268{
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
e21e8467
SH		 279 default:
280 break;
1da177e4
LT		 281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284}
285
7f7d9a6b
HX		 286static int snmp6_alloc_dev(struct inet6_dev *idev)
287{
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 291 goto err_ip;
be281e55
ED		 292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
7f7d9a6b 295 goto err_icmp;
be281e55
ED		 296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
be281e55 304 kfree(idev->stats.icmpv6dev);
7f7d9a6b 305err_icmp:
7d720c3e 306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
16910b98 311static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 312{
be281e55
ED		 313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
7d720c3e 315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 316}
317
1da177e4
LT		 318/* Nobody refers to this device, we may destroy it. */
319
320void in6_dev_finish_destroy(struct inet6_dev *idev)
321{
322 struct net_device *dev = idev->dev;
547b792c 323
502a2ffd 324 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 325 WARN_ON(idev->mc_list != NULL);
326
1da177e4
LT		 327#ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329#endif
330 dev_put(dev);
331 if (!idev->dead) {
e21e8467 332 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 333 return;
334 }
335 snmp6_free_dev(idev);
38f57d1a 336 kfree_rcu(idev, rcu);
1da177e4
LT		 337}
338
7159039a
YH		 339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
1da177e4
LT		 341static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
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
IO		 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
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 */
a9b3cd7f 431 RCU_INIT_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
1da177e4
LT		 436 return ndev;
437}
438
cee89473 439static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 440{
441 struct inet6_dev *idev;
442
443 ASSERT_RTNL();
444
e21e8467
SH		 445 idev = __in6_dev_get(dev);
446 if (!idev) {
447 idev = ipv6_add_dev(dev);
448 if (!idev)
1da177e4
LT		 449 return NULL;
450 }
c5e33bdd 451
1da177e4
LT		 452 if (dev->flags&IFF_UP)
453 ipv6_mc_up(idev);
454 return idev;
455}
456
457#ifdef CONFIG_SYSCTL
458static void dev_forward_change(struct inet6_dev *idev)
459{
460 struct net_device *dev;
461 struct inet6_ifaddr *ifa;
1da177e4
LT		 462
463 if (!idev)
464 return;
465 dev = idev->dev;
0187bdfb
BH		 466 if (idev->cnf.forwarding)
467 dev_disable_lro(dev);
1da177e4 468 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 469 if (idev->cnf.forwarding)
f3ee4010 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 471 else
f3ee4010 472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 473 }
502a2ffd 474
475 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 476 if (ifa->flags&IFA_F_TENTATIVE)
477 continue;
1da177e4
LT		 478 if (idev->cnf.forwarding)
479 addrconf_join_anycast(ifa);
480 else
481 addrconf_leave_anycast(ifa);
482 }
483}
484
485
e186932b 486static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 487{
488 struct net_device *dev;
489 struct inet6_dev *idev;
490
c6d14c84
ED		 491 rcu_read_lock();
492 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 493 idev = __in6_dev_get(dev);
494 if (idev) {
e186932b
PE		 495 int changed = (!idev->cnf.forwarding) ^ (!newf);
496 idev->cnf.forwarding = newf;
1da177e4
LT		 497 if (changed)
498 dev_forward_change(idev);
499 }
1da177e4 500 }
c6d14c84 501 rcu_read_unlock();
1da177e4 502}
c8fecf22 503
b325fddb 504static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 505{
bff16c2f
PE		 506 struct net *net;
507
508 net = (struct net *)table->extra2;
441fc2a2 509 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 510 return 0;
511
88af182e
EB		 512 if (!rtnl_trylock()) {
513 /* Restore the original values before restarting */
514 *p = old;
5007392d 515 return restart_syscall();
88af182e 516 }
c8fecf22 517
e186932b
PE		 518 if (p == &net->ipv6.devconf_all->forwarding) {
519 __s32 newf = net->ipv6.devconf_all->forwarding;
520 net->ipv6.devconf_dflt->forwarding = newf;
521 addrconf_forward_change(net, newf);
c8fecf22
PE		 522 } else if ((!*p) ^ (!old))
523 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 524 rtnl_unlock();
c8fecf22
PE		 525
526 if (*p)
7b4da532 527 rt6_purge_dflt_routers(net);
b325fddb 528 return 1;
c8fecf22 529}
1da177e4
LT		 530#endif
531
5c578aed 532/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 533void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
534{
c2e21293 535 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 536
1da177e4
LT		 537#ifdef NET_REFCNT_DEBUG
538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
539#endif
540
541 in6_dev_put(ifp->idev);
542
543 if (del_timer(&ifp->timer))
e21e8467 544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 545
e9d3e084 546 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 547 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 548 return;
549 }
d8d1f30b 550 dst_release(&ifp->rt->dst);
1da177e4 551
e5785985 552 kfree_rcu(ifp, rcu);
1da177e4
LT		 553}
554
e55ffac6
BH		 555static void
556ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
557{
502a2ffd 558 struct list_head *p;
8a6ce0c0 559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 560
561 /*
562 * Each device address list is sorted in order of scope -
563 * global before linklocal.
564 */
502a2ffd 565 list_for_each(p, &idev->addr_list) {
566 struct inet6_ifaddr *ifa
567 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 569 break;
570 }
571
b54c9b98 572 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 573}
574
3a88a81d 575static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 576{
3eb84f49
YH		 577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
0eae88f3
ED		 581 return jhash_2words((__force u32)addr->s6_addr32[2],
582 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 583 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 584}
585
1da177e4
LT		 586/* On success it returns ifp with increased reference count */
587
588static struct inet6_ifaddr *
589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 590 int scope, u32 flags)
1da177e4
LT		 591{
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
3a88a81d 594 unsigned int hash;
1da177e4 595 int err = 0;
d68b8270
YH		 596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 603
8814c4b5 604 rcu_read_lock_bh();
1da177e4
LT		 605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
56d417b1 610 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 611 err = -EACCES;
612 goto out2;
613 }
614
5c578aed 615 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 616
617 /* Ignore adding duplicate addresses on an interface */
c346dca1 618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
322f74a4 624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
1da177e4
LT		 638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
e9d3e084 641 spin_lock_init(&ifa->state_lock);
1da177e4 642 init_timer(&ifa->timer);
c2e21293 643 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
57f5f544
KF		 650 ifa->rt = rt;
651
95c385b4
NH		 652 /*
653 * part one of RFC 4429, section 3.3
654 * We should not configure an address as
655 * optimistic if we do not yet know the link
656 * layer address of our nexhop router
657 */
658
f2c31e32 659 if (dst_get_neighbour_raw(&rt->dst) == NULL)
95c385b4
NH		 660 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
1da177e4
LT		 662 ifa->idev = idev;
663 in6_dev_hold(idev);
664 /* For caller */
665 in6_ifa_hold(ifa);
666
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
669
5c578aed 670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 671 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
e55ffac6 675 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 676
677#ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 680 in6_ifa_hold(ifa);
681 }
682#endif
683
1da177e4
LT		 684 in6_ifa_hold(ifa);
685 write_unlock(&idev->lock);
686out2:
8814c4b5 687 rcu_read_unlock_bh();
1da177e4 688
fd92833a 689 if (likely(err == 0))
e041c683 690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 691 else {
692 kfree(ifa);
693 ifa = ERR_PTR(err);
694 }
695
696 return ifa;
697out:
5c578aed 698 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 699 goto out2;
700}
701
702/* This function wants to get referenced ifp and releases it before return */
703
704static void ipv6_del_addr(struct inet6_ifaddr *ifp)
705{
502a2ffd 706 struct inet6_ifaddr *ifa, *ifn;
1da177e4 707 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 708 int state;
1da177e4
LT		 709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
711
4c5ff6a6
HX		 712 spin_lock_bh(&ifp->state_lock);
713 state = ifp->state;
e9d3e084 714 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 715 spin_unlock_bh(&ifp->state_lock);
716
717 if (state == INET6_IFADDR_STATE_DEAD)
718 goto out;
1da177e4 719
5c578aed 720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 722 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 723
724 write_lock_bh(&idev->lock);
725#ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 727 list_del(&ifp->tmp_list);
728 if (ifp->ifpub) {
729 in6_ifa_put(ifp->ifpub);
730 ifp->ifpub = NULL;
1da177e4 731 }
372e6c8f 732 __in6_ifa_put(ifp);
1da177e4
LT		 733 }
734#endif
735
502a2ffd 736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 737 if (ifa == ifp) {
502a2ffd 738 list_del_init(&ifp->if_list);
1da177e4 739 __in6_ifa_put(ifp);
502a2ffd 740
1da177e4
LT		 741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
1d142804 744 continue;
1da177e4
LT		 745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
4bed72e4
YH		 759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
1da177e4
LT		 766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 }
774 write_unlock_bh(&idev->lock);
775
b2238566
AV		 776 addrconf_del_timer(ifp);
777
1da177e4
LT		 778 ipv6_ifa_notify(RTM_DELADDR, ifp);
779
e041c683 780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 781
1da177e4
LT		 782 /*
783 * Purge or update corresponding prefix
784 *
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
794 *
795 * --yoshfuji
796 */
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
799 struct rt6_info *rt;
c346dca1 800 struct net *net = dev_net(ifp->idev->dev);
1da177e4 801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 803
2b5ead46 804 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 805 if (onlink == 0) {
e0a1ad73 806 ip6_del_rt(rt);
1da177e4
LT		 807 rt = NULL;
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_EXPIRES;
811 }
812 }
d8d1f30b 813 dst_release(&rt->dst);
1da177e4
LT		 814 }
815
c3968a85
DW		 816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
4c5ff6a6 818out:
1da177e4
LT		 819 in6_ifa_put(ifp);
820}
821
822#ifdef CONFIG_IPV6_PRIVACY
823static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
824{
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
76f793e3 827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 828 unsigned long regen_advance;
1da177e4
LT		 829 int tmp_plen;
830 int ret = 0;
831 int max_addresses;
95c385b4 832 u32 addr_flags;
76f793e3 833 unsigned long now = jiffies;
1da177e4
LT		 834
835 write_lock(&idev->lock);
836 if (ift) {
837 spin_lock_bh(&ift->lock);
838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
839 spin_unlock_bh(&ift->lock);
840 tmpaddr = &addr;
841 } else {
842 tmpaddr = NULL;
843 }
844retry:
845 in6_dev_hold(idev);
846 if (idev->cnf.use_tempaddr <= 0) {
847 write_unlock(&idev->lock);
848 printk(KERN_INFO
849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
850 in6_dev_put(idev);
851 ret = -1;
852 goto out;
853 }
854 spin_lock_bh(&ifp->lock);
855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
856 idev->cnf.use_tempaddr = -1; /*XXX*/
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
859 printk(KERN_WARNING
860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 in6_ifa_hold(ifp);
866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
872 in6_ifa_put(ifp);
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 878 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 879 tmp_valid_lft = min_t(__u32,
880 ifp->valid_lft,
7a876b0e 881 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 882 tmp_prefered_lft = min_t(__u32,
883 ifp->prefered_lft,
7a876b0e 884 idev->cnf.temp_prefered_lft + age -
784e2710 885 idev->cnf.max_desync_factor);
1da177e4
LT		 886 tmp_plen = ifp->prefix_len;
887 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
eac55bf9
BB		 891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
1da177e4 894 write_unlock(&idev->lock);
95c385b4 895
eac55bf9
BB		 896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
95c385b4
NH		 908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
1da177e4 913 ift = !max_addresses ||
1ab1457c 914 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 915 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
1da177e4
LT		 918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
76f793e3 932 ift->cstamp = now;
1da177e4
LT		 933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939out:
940 return ret;
941}
942#endif
943
944/*
072047e4 945 * Choose an appropriate source address (RFC3484)
1da177e4 946 */
a9b05723
YH		 947enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952#ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954#endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957#ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959#endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963};
964
072047e4 965struct ipv6_saddr_score {
a9b05723
YH		 966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
072047e4
YH		 972};
973
a9b05723 974struct ipv6_saddr_dst {
9acd9f3a 975 const struct in6_addr *addr;
a9b05723
YH		 976 int ifindex;
977 int scope;
978 int label;
7cbca67c 979 unsigned int prefs;
a9b05723 980};
072047e4 981
b6f99a21 982static inline int ipv6_saddr_preferred(int type)
1da177e4 983{
45bb0060 984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 985 return 1;
986 return 0;
1da177e4
LT		 987}
988
3de23255
BT		 989static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
a9b05723
YH		 991 struct ipv6_saddr_dst *dst,
992 int i)
993{
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053#ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
7cbca67c 1055 {
a9b05723 1056 /* Rule 4: Prefer home address */
7cbca67c
YH		 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1059 break;
7cbca67c 1060 }
a9b05723
YH		 1061#endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
3de23255
BT		 1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073#ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1075 {
a9b05723 1076 /* Rule 7: Prefer public address
25985edc 1077 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1078 */
7cbca67c
YH		 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1083 break;
7cbca67c 1084 }
a9b05723
YH		 1085#endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105out:
1106 return ret;
1107}
1108
191cd582 1109int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1110 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1111 struct in6_addr *saddr)
1da177e4 1112{
a9b05723
YH		 1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1115 struct ipv6_saddr_dst dst;
072047e4 1116 struct net_device *dev;
a9b05723 1117 int dst_type;
1da177e4 1118
a9b05723
YH		 1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1124 dst.prefs = prefs;
a9b05723
YH		 1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1da177e4 1128
8814c4b5 1129 rcu_read_lock();
1da177e4 1130
c6d14c84 1131 for_each_netdev_rcu(net, dev) {
072047e4 1132 struct inet6_dev *idev;
072047e4 1133
a9b05723 1134 /* Candidate Source Address (section 4)
072047e4
YH		 1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
a9b05723
YH		 1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1149 continue;
1da177e4 1150
1da177e4 1151 idev = __in6_dev_get(dev);
072047e4
YH		 1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
502a2ffd 1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1157 int i;
072047e4 1158
a9b05723 1159 /*
6b3ae80a
YH		 1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
95c385b4 1163 * sense, unless it is also flagged as optimistic.
6b3ae80a 1164 * - Candidate Source Address (section 4)
072047e4
YH		 1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
a9b05723
YH		 1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1171 continue;
a9b05723
YH		 1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1177 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1178 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
a9b05723
YH		 1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
3de23255
BT		 1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
a9b05723
YH		 1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
a0bffffc 1213 swap(hiscore, score);
a9b05723
YH		 1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1da177e4 1219 }
072047e4 1220 }
1da177e4 1221 }
a9b05723 1222try_nextdev:
072047e4 1223 read_unlock_bh(&idev->lock);
1da177e4 1224 }
8814c4b5 1225 rcu_read_unlock();
1da177e4 1226
a9b05723 1227 if (!hiscore->ifa)
072047e4 1228 return -EADDRNOTAVAIL;
1ab1457c 1229
a9b05723
YH		 1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
072047e4 1232 return 0;
1da177e4 1233}
5e5f3f0f 1234EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1235
95c385b4
NH		 1236int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1da177e4
LT		 1238{
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
8814c4b5 1242 rcu_read_lock();
e21e8467
SH		 1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1da177e4
LT		 1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
502a2ffd 1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
8814c4b5 1258 rcu_read_unlock();
1da177e4
LT		 1259 return err;
1260}
1261
1262static int ipv6_count_addresses(struct inet6_dev *idev)
1263{
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
502a2ffd 1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272}
1273
b71d1d42 1274int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1275 struct net_device *dev, int strict)
1da177e4 1276{
eedf042a 1277 struct inet6_ifaddr *ifp;
c2e21293 1278 struct hlist_node *node;
3a88a81d 1279 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1280
5c578aed 1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1283 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1284 continue;
1da177e4 1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1290 return 1;
1da177e4
LT		 1291 }
1292 }
5c578aed 1293
eedf042a
SH		 1294 rcu_read_unlock_bh();
1295 return 0;
1da177e4 1296}
7159039a
YH		 1297EXPORT_SYMBOL(ipv6_chk_addr);
1298
3e81c6da
DM		 1299static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1da177e4 1301{
3e81c6da 1302 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1da177e4 1305
c2e21293 1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1307 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1308 continue;
1da177e4
LT		 1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1311 return true;
1da177e4
LT		 1312 }
1313 }
3e81c6da 1314 return false;
1da177e4
LT		 1315}
1316
b71d1d42 1317int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1318{
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
502a2ffd 1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338}
1339
1340EXPORT_SYMBOL(ipv6_chk_prefix);
1341
9acd9f3a 1342struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1343 struct net_device *dev, int strict)
1da177e4 1344{
b79d1d54 1345 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1346 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1347 struct hlist_node *node;
1da177e4 1348
5c578aed 1349 rcu_read_lock_bh();
4f70ecca 1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1352 continue;
1da177e4
LT		 1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1356 result = ifp;
1da177e4
LT		 1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
5c578aed 1362 rcu_read_unlock_bh();
1da177e4 1363
b79d1d54 1364 return result;
1da177e4
LT		 1365}
1366
1da177e4
LT		 1367/* Gets referenced address, destroys ifaddr */
1368
cc411d0b 1369static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1370{
1da177e4
LT		 1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1377 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1380 in6_ifa_put(ifp);
1381#ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395#endif
1396 } else
1397 ipv6_del_addr(ifp);
1398}
1399
f2344a13
HX		 1400static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1401{
1402 int err = -ENOENT;
1403
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1407 err = 0;
1408 }
1409 spin_unlock(&ifp->state_lock);
1410
1411 return err;
1412}
1413
3c21edbd
YH		 1414void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415{
1b34be74 1416 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1417
853dc2e0
UB		 1418 if (addrconf_dad_end(ifp)) {
1419 in6_ifa_put(ifp);
f2344a13 1420 return;
853dc2e0 1421 }
f2344a13 1422
9bdd8d40 1423 if (net_ratelimit())
0522fea6
JR		 1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1426
1b34be74
YH		 1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1429
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1432
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1437
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1b34be74
YH		 1440 }
1441 }
1442
cc411d0b 1443 addrconf_dad_stop(ifp, 1);
3c21edbd 1444}
1da177e4
LT		 1445
1446/* Join to solicited addr multicast group. */
1447
b71d1d42 1448void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1449{
1450 struct in6_addr maddr;
1451
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1453 return;
1454
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1457}
1458
b71d1d42 1459void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1460{
1461 struct in6_addr maddr;
1462
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 return;
1465
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1468}
1469
20380731 1470static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1471{
1472 struct in6_addr addr;
2bda8a0c
BM		 1473 if (ifp->prefix_len == 127) /* RFC 6164 */
1474 return;
1da177e4
LT		 1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476 if (ipv6_addr_any(&addr))
1477 return;
1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1479}
1480
20380731 1481static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1482{
1483 struct in6_addr addr;
32019e65
YH		 1484 if (ifp->prefix_len == 127) /* RFC 6164 */
1485 return;
1da177e4
LT		 1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490}
1491
073a8e0e
YH		 1492static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1493{
1494 if (dev->addr_len != ETH_ALEN)
1495 return -1;
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498
1499 /*
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1504 *
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1511 */
1512 if (dev->dev_id) {
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1515 } else {
1516 eui[3] = 0xFF;
1517 eui[4] = 0xFE;
1518 eui[0] ^= 2;
1519 }
1520 return 0;
1521}
1522
1523static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1524{
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1527 return -1;
1528 memset(eui, 0, 7);
1529 eui[7] = *(u8*)dev->dev_addr;
1530 return 0;
1531}
1532
1533static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1534{
1535 if (dev->addr_len != INFINIBAND_ALEN)
1536 return -1;
1537 memcpy(eui, dev->dev_addr + 12, 8);
1538 eui[0] |= 2;
1539 return 0;
1540}
1541
c61393ea 1542static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1543{
9af28511
SH		 1544 if (addr == 0)
1545 return -1;
dfd982ba
YH		 1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1552 eui[1] = 0;
1553 eui[2] = 0x5E;
1554 eui[3] = 0xFE;
1555 memcpy(eui + 4, &addr, 4);
1556 return 0;
1557}
dfd982ba
YH		 1558
1559static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560{
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564}
1565
aee80b54 1566static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1567{
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569}
1570
1da177e4
LT		 1571static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572{
1573 switch (dev->type) {
1574 case ARPHRD_ETHER:
1575 case ARPHRD_FDDI:
1576 case ARPHRD_IEEE802_TR:
073a8e0e 1577 return addrconf_ifid_eui48(eui, dev);
1da177e4 1578 case ARPHRD_ARCNET:
073a8e0e 1579 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1580 case ARPHRD_INFINIBAND:
073a8e0e 1581 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1582 case ARPHRD_SIT:
dfd982ba 1583 return addrconf_ifid_sit(eui, dev);
aee80b54 1584 case ARPHRD_IPGRE:
1585 return addrconf_ifid_gre(eui, dev);
1da177e4
LT		 1586 }
1587 return -1;
1588}
1589
1590static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1591{
1592 int err = -1;
1593 struct inet6_ifaddr *ifp;
1594
1595 read_lock_bh(&idev->lock);
502a2ffd 1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1599 err = 0;
1600 break;
1601 }
1602 }
1603 read_unlock_bh(&idev->lock);
1604 return err;
1605}
1606
1607#ifdef CONFIG_IPV6_PRIVACY
1608/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609static int __ipv6_regen_rndid(struct inet6_dev *idev)
1610{
1da177e4 1611regen:
955189ef 1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1613 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1614
1615 /*
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1618 *
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
c7dc89c0 1621 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1622 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - value 0
1624 * - XXX: already assigned to an address on the device
1625 */
1ab1457c 1626 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1629 goto regen;
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 goto regen;
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1634 goto regen;
1635 }
1636
1637 return 0;
1638}
1639
1640static void ipv6_regen_rndid(unsigned long data)
1641{
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1644
8814c4b5 1645 rcu_read_lock_bh();
1da177e4
LT		 1646 write_lock_bh(&idev->lock);
1647
1648 if (idev->dead)
1649 goto out;
1650
1651 if (__ipv6_regen_rndid(idev) < 0)
1652 goto out;
1ab1457c 1653
1da177e4 1654 expires = jiffies +
1ab1457c 1655 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1657 idev->cnf.max_desync_factor * HZ;
1da177e4
LT		 1658 if (time_before(expires, jiffies)) {
1659 printk(KERN_WARNING
1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1661 idev->dev->name);
1662 goto out;
1663 }
1664
1665 if (!mod_timer(&idev->regen_timer, expires))
1666 in6_dev_hold(idev);
1667
1668out:
1669 write_unlock_bh(&idev->lock);
8814c4b5 1670 rcu_read_unlock_bh();
1da177e4
LT		 1671 in6_dev_put(idev);
1672}
1673
1674static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1675 int ret = 0;
1676
1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1678 ret = __ipv6_regen_rndid(idev);
1679 return ret;
1680}
1681#endif
1682
1683/*
1684 * Add prefix route.
1685 */
1686
1687static void
1688addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1689 unsigned long expires, u32 flags)
1da177e4 1690{
86872cb5
TG		 1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_PREFIX,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_expires = expires,
1696 .fc_dst_len = plen,
1697 .fc_flags = RTF_UP | flags,
c346dca1 1698 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1699 .fc_protocol = RTPROT_KERNEL,
86872cb5 1700 };
1da177e4 1701
86872cb5 1702 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1703
1704 /* Prevent useless cloning on PtP SIT.
1705 This thing is done here expecting that the whole
1706 class of non-broadcast devices need not cloning.
1707 */
0be669bb 1708#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1710 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1711#endif
1da177e4 1712
86872cb5 1713 ip6_route_add(&cfg);
1da177e4
LT		 1714}
1715
1716/* Create "default" multicast route to the interface */
1717
1718static void addrconf_add_mroute(struct net_device *dev)
1719{
86872cb5
TG		 1720 struct fib6_config cfg = {
1721 .fc_table = RT6_TABLE_LOCAL,
1722 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1723 .fc_ifindex = dev->ifindex,
1724 .fc_dst_len = 8,
1725 .fc_flags = RTF_UP,
c346dca1 1726 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1727 };
1728
1729 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730
1731 ip6_route_add(&cfg);
1da177e4
LT		 1732}
1733
0be669bb 1734#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1735static void sit_route_add(struct net_device *dev)
1736{
86872cb5
TG		 1737 struct fib6_config cfg = {
1738 .fc_table = RT6_TABLE_MAIN,
1739 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1740 .fc_ifindex = dev->ifindex,
1741 .fc_dst_len = 96,
1742 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1743 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1744 };
1da177e4
LT		 1745
1746 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1747 ip6_route_add(&cfg);
1da177e4 1748}
0be669bb 1749#endif
1da177e4
LT		 1750
1751static void addrconf_add_lroute(struct net_device *dev)
1752{
1753 struct in6_addr addr;
1754
1755 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1756 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1757}
1758
1759static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760{
1761 struct inet6_dev *idev;
1762
1763 ASSERT_RTNL();
1764
e21e8467
SH		 1765 idev = ipv6_find_idev(dev);
1766 if (!idev)
64e724f6
BH		 1767 return ERR_PTR(-ENOBUFS);
1768
1769 if (idev->cnf.disable_ipv6)
1770 return ERR_PTR(-EACCES);
1da177e4
LT		 1771
1772 /* Add default multicast route */
1773 addrconf_add_mroute(dev);
1774
1775 /* Add link local route */
1776 addrconf_add_lroute(dev);
1777 return idev;
1778}
1779
1780void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781{
1782 struct prefix_info *pinfo;
1783 __u32 valid_lft;
1784 __u32 prefered_lft;
1785 int addr_type;
1da177e4 1786 struct inet6_dev *in6_dev;
56d417b1 1787 struct net *net = dev_net(dev);
1da177e4
LT		 1788
1789 pinfo = (struct prefix_info *) opt;
1ab1457c 1790
1da177e4
LT		 1791 if (len < sizeof(struct prefix_info)) {
1792 ADBG(("addrconf: prefix option too short\n"));
1793 return;
1794 }
1ab1457c 1795
1da177e4
LT		 1796 /*
1797 * Validation checks ([ADDRCONF], page 19)
1798 */
1799
1800 addr_type = ipv6_addr_type(&pinfo->prefix);
1801
1802 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1803 return;
1804
1805 valid_lft = ntohl(pinfo->valid);
1806 prefered_lft = ntohl(pinfo->prefered);
1807
1808 if (prefered_lft > valid_lft) {
1809 if (net_ratelimit())
1810 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1811 return;
1812 }
1813
1814 in6_dev = in6_dev_get(dev);
1815
1816 if (in6_dev == NULL) {
1817 if (net_ratelimit())
1818 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1819 return;
1820 }
1821
1822 /*
1823 * Two things going on here:
1824 * 1) Add routes for on-link prefixes
1825 * 2) Configure prefixes with the auto flag set
1826 */
1827
4bed72e4
YH		 1828 if (pinfo->onlink) {
1829 struct rt6_info *rt;
1830 unsigned long rt_expires;
1831
6f704992
YH		 1832 /* Avoid arithmetic overflow. Really, we could
1833 * save rt_expires in seconds, likely valid_lft,
1834 * but it would require division in fib gc, that it
1835 * not good.
1836 */
4bed72e4
YH		 1837 if (HZ > USER_HZ)
1838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1839 else
1840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1841
4bed72e4
YH		 1842 if (addrconf_finite_timeout(rt_expires))
1843 rt_expires *= HZ;
1da177e4 1844
56d417b1 1845 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1846 dev->ifindex, 1);
1da177e4 1847
2b5ead46 1848 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1849 /* Autoconf prefix route */
1850 if (valid_lft == 0) {
1851 ip6_del_rt(rt);
1852 rt = NULL;
4bed72e4 1853 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1854 /* not infinity */
1855 rt->rt6i_expires = jiffies + rt_expires;
1856 rt->rt6i_flags |= RTF_EXPIRES;
1857 } else {
1858 rt->rt6i_flags &= ~RTF_EXPIRES;
1859 rt->rt6i_expires = 0;
1da177e4
LT		 1860 }
1861 } else if (valid_lft) {
6f704992 1862 clock_t expires = 0;
4bed72e4
YH		 1863 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1864 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1865 /* not infinity */
1866 flags |= RTF_EXPIRES;
1867 expires = jiffies_to_clock_t(rt_expires);
1868 }
1da177e4 1869 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1870 dev, expires, flags);
1da177e4
LT		 1871 }
1872 if (rt)
d8d1f30b 1873 dst_release(&rt->dst);
1da177e4
LT		 1874 }
1875
1876 /* Try to figure out our local address for this prefix */
1877
1878 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1879 struct inet6_ifaddr * ifp;
1880 struct in6_addr addr;
1881 int create = 0, update_lft = 0;
1882
1883 if (pinfo->prefix_len == 64) {
1884 memcpy(&addr, &pinfo->prefix, 8);
1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890 goto ok;
1891 }
1892 if (net_ratelimit())
1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 pinfo->prefix_len);
1895 in6_dev_put(in6_dev);
1896 return;
1897
1898ok:
1899
53b7997f 1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1901
1902 if (ifp == NULL && valid_lft) {
1903 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1904 u32 addr_flags = 0;
1905
1906#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1907 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1908 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1909 addr_flags = IFA_F_OPTIMISTIC;
1910#endif
1da177e4
LT		 1911
1912 /* Do not allow to create too much of autoconfigured
1913 * addresses; this would be too easy way to crash kernel.
1914 */
1915 if (!max_addresses ||
1916 ipv6_count_addresses(in6_dev) < max_addresses)
1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1918 addr_type&IPV6_ADDR_SCOPE_MASK,
1919 addr_flags);
1da177e4
LT		 1920
1921 if (!ifp || IS_ERR(ifp)) {
1922 in6_dev_put(in6_dev);
1923 return;
1924 }
1925
1926 update_lft = create = 1;
1927 ifp->cstamp = jiffies;
1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1929 }
1930
1931 if (ifp) {
1932 int flags;
1933 unsigned long now;
1934#ifdef CONFIG_IPV6_PRIVACY
1935 struct inet6_ifaddr *ift;
1936#endif
1937 u32 stored_lft;
1938
1939 /* update lifetime (RFC2462 5.5.3 e) */
1940 spin_lock(&ifp->lock);
1941 now = jiffies;
1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1944 else
1945 stored_lft = 0;
1946 if (!update_lft && stored_lft) {
1947 if (valid_lft > MIN_VALID_LIFETIME ||
1948 valid_lft > stored_lft)
1949 update_lft = 1;
1950 else if (stored_lft <= MIN_VALID_LIFETIME) {
1951 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1952 /*
1953 * RFC 4862 Section 5.5.3e:
1954 * "Note that the preferred lifetime of
1955 * the corresponding address is always
1956 * reset to the Preferred Lifetime in
1957 * the received Prefix Information
1958 * option, regardless of whether the
1959 * valid lifetime is also reset or
1960 * ignored."
1961 *
1962 * So if the preferred lifetime in
1963 * this advertisement is different
1964 * than what we have stored, but the
1965 * valid lifetime is invalid, just
1966 * reset prefered_lft.
1967 *
1968 * We must set the valid lifetime
1969 * to the stored lifetime since we'll
1970 * be updating the timestamp below,
1971 * else we'll set it back to the
25985edc 1972 * minimum.
a1ed0526
BH		 1973 */
1974 if (prefered_lft != ifp->prefered_lft) {
1975 valid_lft = stored_lft;
1976 update_lft = 1;
1977 }
1da177e4
LT		 1978 } else {
1979 valid_lft = MIN_VALID_LIFETIME;
1980 if (valid_lft < prefered_lft)
1981 prefered_lft = valid_lft;
1982 update_lft = 1;
1983 }
1984 }
1985
1986 if (update_lft) {
1987 ifp->valid_lft = valid_lft;
1988 ifp->prefered_lft = prefered_lft;
1989 ifp->tstamp = now;
1990 flags = ifp->flags;
1991 ifp->flags &= ~IFA_F_DEPRECATED;
1992 spin_unlock(&ifp->lock);
1993
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ifp);
1996 } else
1997 spin_unlock(&ifp->lock);
1998
1999#ifdef CONFIG_IPV6_PRIVACY
2000 read_lock_bh(&in6_dev->lock);
2001 /* update all temporary addresses in the list */
76f793e3
LC		 2002 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2003 tmp_list) {
2004 int age, max_valid, max_prefered;
2005
c6fbfac2
BB		 2006 if (ifp != ift->ifpub)
2007 continue;
2008
76f793e3
LC		 2009 /*
2010 * RFC 4941 section 3.3:
2011 * If a received option will extend the lifetime
2012 * of a public address, the lifetimes of
2013 * temporary addresses should be extended,
2014 * subject to the overall constraint that no
2015 * temporary addresses should ever remain
2016 * "valid" or "preferred" for a time longer than
2017 * (TEMP_VALID_LIFETIME) or
2018 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2019 * respectively.
2020 */
2021 age = (now - ift->cstamp) / HZ;
2022 max_valid = in6_dev->cnf.temp_valid_lft - age;
2023 if (max_valid < 0)
2024 max_valid = 0;
2025
2026 max_prefered = in6_dev->cnf.temp_prefered_lft -
2027 in6_dev->cnf.max_desync_factor -
2028 age;
2029 if (max_prefered < 0)
2030 max_prefered = 0;
2031
2032 if (valid_lft > max_valid)
2033 valid_lft = max_valid;
2034
2035 if (prefered_lft > max_prefered)
2036 prefered_lft = max_prefered;
2037
1da177e4
LT		 2038 spin_lock(&ift->lock);
2039 flags = ift->flags;
76f793e3
LC		 2040 ift->valid_lft = valid_lft;
2041 ift->prefered_lft = prefered_lft;
2042 ift->tstamp = now;
2043 if (prefered_lft > 0)
2044 ift->flags &= ~IFA_F_DEPRECATED;
2045
1da177e4
LT		 2046 spin_unlock(&ift->lock);
2047 if (!(flags&IFA_F_TENTATIVE))
2048 ipv6_ifa_notify(0, ift);
2049 }
2050
aed65501 2051 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2052 /*
76f793e3
LC		 2053 * When a new public address is created as
2054 * described in [ADDRCONF], also create a new
2055 * temporary address. Also create a temporary
2056 * address if it's enabled but no temporary
2057 * address currently exists.
1da177e4 2058 */
1ab1457c 2059 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2060 ipv6_create_tempaddr(ifp, NULL);
2061 } else {
2062 read_unlock_bh(&in6_dev->lock);
2063 }
2064#endif
2065 in6_ifa_put(ifp);
2066 addrconf_verify(0);
2067 }
2068 }
2069 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2070 in6_dev_put(in6_dev);
2071}
2072
2073/*
2074 * Set destination address.
2075 * Special case for SIT interfaces where we create a new "virtual"
2076 * device.
2077 */
af284937 2078int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2079{
2080 struct in6_ifreq ireq;
2081 struct net_device *dev;
2082 int err = -EINVAL;
2083
2084 rtnl_lock();
2085
2086 err = -EFAULT;
2087 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2088 goto err_exit;
2089
af284937 2090 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2091
2092 err = -ENODEV;
2093 if (dev == NULL)
2094 goto err_exit;
2095
0be669bb 2096#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2097 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2098 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2099 struct ifreq ifr;
1da177e4
LT		 2100 struct ip_tunnel_parm p;
2101
2102 err = -EADDRNOTAVAIL;
2103 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2104 goto err_exit;
2105
2106 memset(&p, 0, sizeof(p));
2107 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2108 p.iph.saddr = 0;
2109 p.iph.version = 4;
2110 p.iph.ihl = 5;
2111 p.iph.protocol = IPPROTO_IPV6;
2112 p.iph.ttl = 64;
d20b3109 2113 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2114
5bc3eb7e
SH		 2115 if (ops->ndo_do_ioctl) {
2116 mm_segment_t oldfs = get_fs();
2117
2118 set_fs(KERNEL_DS);
2119 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2120 set_fs(oldfs);
2121 } else
2122 err = -EOPNOTSUPP;
1da177e4
LT		 2123
2124 if (err == 0) {
2125 err = -ENOBUFS;
af284937
DL		 2126 dev = __dev_get_by_name(net, p.name);
2127 if (!dev)
1da177e4
LT		 2128 goto err_exit;
2129 err = dev_open(dev);
2130 }
2131 }
0be669bb 2132#endif
1da177e4
LT		 2133
2134err_exit:
2135 rtnl_unlock();
2136 return err;
2137}
2138
2139/*
2140 * Manual configuration of address on an interface
2141 */
b71d1d42 2142static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2143 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2144 __u32 valid_lft)
1da177e4
LT		 2145{
2146 struct inet6_ifaddr *ifp;
2147 struct inet6_dev *idev;
2148 struct net_device *dev;
2149 int scope;
6f704992
YH		 2150 u32 flags;
2151 clock_t expires;
4bed72e4 2152 unsigned long timeout;
1da177e4
LT		 2153
2154 ASSERT_RTNL();
1ab1457c 2155
24ef0da7
TG		 2156 if (plen > 128)
2157 return -EINVAL;
2158
0778769d
NT		 2159 /* check the lifetime */
2160 if (!valid_lft || prefered_lft > valid_lft)
2161 return -EINVAL;
2162
af284937
DL		 2163 dev = __dev_get_by_index(net, ifindex);
2164 if (!dev)
1da177e4 2165 return -ENODEV;
1ab1457c 2166
64e724f6
BH		 2167 idev = addrconf_add_dev(dev);
2168 if (IS_ERR(idev))
2169 return PTR_ERR(idev);
1da177e4
LT		 2170
2171 scope = ipv6_addr_scope(pfx);
2172
4bed72e4
YH		 2173 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2174 if (addrconf_finite_timeout(timeout)) {
2175 expires = jiffies_to_clock_t(timeout * HZ);
2176 valid_lft = timeout;
6f704992 2177 flags = RTF_EXPIRES;
4bed72e4
YH		 2178 } else {
2179 expires = 0;
2180 flags = 0;
2181 ifa_flags |= IFA_F_PERMANENT;
6f704992 2182 }
0778769d 2183
4bed72e4
YH		 2184 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2185 if (addrconf_finite_timeout(timeout)) {
2186 if (timeout == 0)
2187 ifa_flags |= IFA_F_DEPRECATED;
2188 prefered_lft = timeout;
2189 }
0778769d
NT		 2190
2191 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2192
1da177e4 2193 if (!IS_ERR(ifp)) {
06aebfb7 2194 spin_lock_bh(&ifp->lock);
0778769d
NT		 2195 ifp->valid_lft = valid_lft;
2196 ifp->prefered_lft = prefered_lft;
2197 ifp->tstamp = jiffies;
06aebfb7 2198 spin_unlock_bh(&ifp->lock);
0778769d 2199
46d48046 2200 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2201 expires, flags);
95c385b4
NH		 2202 /*
2203 * Note that section 3.1 of RFC 4429 indicates
2204 * that the Optimistic flag should not be set for
2205 * manually configured addresses
2206 */
1da177e4
LT		 2207 addrconf_dad_start(ifp, 0);
2208 in6_ifa_put(ifp);
0778769d 2209 addrconf_verify(0);
1da177e4
LT		 2210 return 0;
2211 }
2212
2213 return PTR_ERR(ifp);
2214}
2215
b71d1d42 2216static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2217 unsigned int plen)
1da177e4
LT		 2218{
2219 struct inet6_ifaddr *ifp;
2220 struct inet6_dev *idev;
2221 struct net_device *dev;
1ab1457c 2222
24ef0da7
TG		 2223 if (plen > 128)
2224 return -EINVAL;
2225
af284937
DL		 2226 dev = __dev_get_by_index(net, ifindex);
2227 if (!dev)
1da177e4
LT		 2228 return -ENODEV;
2229
2230 if ((idev = __in6_dev_get(dev)) == NULL)
2231 return -ENXIO;
2232
2233 read_lock_bh(&idev->lock);
502a2ffd 2234 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2235 if (ifp->prefix_len == plen &&
2236 ipv6_addr_equal(pfx, &ifp->addr)) {
2237 in6_ifa_hold(ifp);
2238 read_unlock_bh(&idev->lock);
1ab1457c 2239
1da177e4
LT		 2240 ipv6_del_addr(ifp);
2241
2242 /* If the last address is deleted administratively,
2243 disable IPv6 on this interface.
2244 */
502a2ffd 2245 if (list_empty(&idev->addr_list))
1da177e4
LT		 2246 addrconf_ifdown(idev->dev, 1);
2247 return 0;
2248 }
2249 }
2250 read_unlock_bh(&idev->lock);
2251 return -EADDRNOTAVAIL;
2252}
2253
2254
af284937 2255int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2256{
2257 struct in6_ifreq ireq;
2258 int err;
1ab1457c 2259
1da177e4
LT		 2260 if (!capable(CAP_NET_ADMIN))
2261 return -EPERM;
1ab1457c 2262
1da177e4
LT		 2263 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2264 return -EFAULT;
2265
2266 rtnl_lock();
af284937
DL		 2267 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2268 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2269 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2270 rtnl_unlock();
2271 return err;
2272}
2273
af284937 2274int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2275{
2276 struct in6_ifreq ireq;
2277 int err;
1ab1457c 2278
1da177e4
LT		 2279 if (!capable(CAP_NET_ADMIN))
2280 return -EPERM;
2281
2282 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2283 return -EFAULT;
2284
2285 rtnl_lock();
af284937
DL		 2286 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2287 ireq.ifr6_prefixlen);
1da177e4
LT		 2288 rtnl_unlock();
2289 return err;
2290}
2291
b5f348e5
IJ		 2292static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2293 int plen, int scope)
2294{
2295 struct inet6_ifaddr *ifp;
2296
2297 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2298 if (!IS_ERR(ifp)) {
2299 spin_lock_bh(&ifp->lock);
2300 ifp->flags &= ~IFA_F_TENTATIVE;
2301 spin_unlock_bh(&ifp->lock);
2302 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2303 in6_ifa_put(ifp);
2304 }
2305}
2306
0be669bb 2307#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2308static void sit_add_v4_addrs(struct inet6_dev *idev)
2309{
1da177e4
LT		 2310 struct in6_addr addr;
2311 struct net_device *dev;
c346dca1 2312 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2313 int scope;
2314
2315 ASSERT_RTNL();
2316
2317 memset(&addr, 0, sizeof(struct in6_addr));
2318 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2319
2320 if (idev->dev->flags&IFF_POINTOPOINT) {
2321 addr.s6_addr32[0] = htonl(0xfe800000);
2322 scope = IFA_LINK;
2323 } else {
2324 scope = IPV6_ADDR_COMPATv4;
2325 }
2326
2327 if (addr.s6_addr32[3]) {
b5f348e5 2328 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2329 return;
2330 }
2331
6fda7350 2332 for_each_netdev(net, dev) {
e5ed6399 2333 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2334 if (in_dev && (dev->flags & IFF_UP)) {
2335 struct in_ifaddr * ifa;
2336
2337 int flag = scope;
2338
2339 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2340 int plen;
2341
2342 addr.s6_addr32[3] = ifa->ifa_local;
2343
2344 if (ifa->ifa_scope == RT_SCOPE_LINK)
2345 continue;
2346 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2347 if (idev->dev->flags&IFF_POINTOPOINT)
2348 continue;
2349 flag |= IFA_HOST;
2350 }
2351 if (idev->dev->flags&IFF_POINTOPOINT)
2352 plen = 64;
2353 else
2354 plen = 96;
2355
b5f348e5 2356 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2357 }
2358 }
1ab1457c 2359 }
1da177e4 2360}
0be669bb 2361#endif
1da177e4
LT		 2362
2363static void init_loopback(struct net_device *dev)
2364{
2365 struct inet6_dev *idev;
1da177e4
LT		 2366
2367 /* ::1 */
2368
2369 ASSERT_RTNL();
2370
2371 if ((idev = ipv6_find_idev(dev)) == NULL) {
2372 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2373 return;
2374 }
2375
b5f348e5 2376 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2377}
2378
b71d1d42 2379static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 2380{
2381 struct inet6_ifaddr * ifp;
95c385b4
NH		 2382 u32 addr_flags = IFA_F_PERMANENT;
2383
2384#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2385 if (idev->cnf.optimistic_dad &&
702beb87 2386 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2387 addr_flags |= IFA_F_OPTIMISTIC;
2388#endif
1da177e4 2389
95c385b4
NH		 2390
2391 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2392 if (!IS_ERR(ifp)) {
46d48046 2393 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2394 addrconf_dad_start(ifp, 0);
2395 in6_ifa_put(ifp);
2396 }
2397}
2398
2399static void addrconf_dev_config(struct net_device *dev)
2400{
2401 struct in6_addr addr;
2402 struct inet6_dev * idev;
2403
2404 ASSERT_RTNL();
2405
74235a25
HX		 2406 if ((dev->type != ARPHRD_ETHER) &&
2407 (dev->type != ARPHRD_FDDI) &&
2408 (dev->type != ARPHRD_IEEE802_TR) &&
2409 (dev->type != ARPHRD_ARCNET) &&
2410 (dev->type != ARPHRD_INFINIBAND)) {
2411 /* Alas, we support only Ethernet autoconfiguration. */
2412 return;
2413 }
2414
1da177e4 2415 idev = addrconf_add_dev(dev);
64e724f6 2416 if (IS_ERR(idev))
1da177e4
LT		 2417 return;
2418
2419 memset(&addr, 0, sizeof(struct in6_addr));
2420 addr.s6_addr32[0] = htonl(0xFE800000);
2421
2422 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2423 addrconf_add_linklocal(idev, &addr);
2424}
2425
0be669bb 2426#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2427static void addrconf_sit_config(struct net_device *dev)
2428{
2429 struct inet6_dev *idev;
2430
2431 ASSERT_RTNL();
2432
1ab1457c
YH		 2433 /*
2434 * Configure the tunnel with one of our IPv4
2435 * addresses... we should configure all of
1da177e4
LT		 2436 * our v4 addrs in the tunnel
2437 */
2438
2439 if ((idev = ipv6_find_idev(dev)) == NULL) {
2440 printk(KERN_DEBUG "init sit: add_dev failed\n");
2441 return;
2442 }
2443
c7dc89c0
FT		 2444 if (dev->priv_flags & IFF_ISATAP) {
2445 struct in6_addr addr;
2446
2447 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2448 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2449 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2450 addrconf_add_linklocal(idev, &addr);
2451 return;
2452 }
2453
1da177e4
LT		 2454 sit_add_v4_addrs(idev);
2455
2456 if (dev->flags&IFF_POINTOPOINT) {
2457 addrconf_add_mroute(dev);
2458 addrconf_add_lroute(dev);
2459 } else
2460 sit_route_add(dev);
2461}
0be669bb 2462#endif
1da177e4 2463
aee80b54 2464#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2465static void addrconf_gre_config(struct net_device *dev)
2466{
2467 struct inet6_dev *idev;
2468 struct in6_addr addr;
2469
2470 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2471
2472 ASSERT_RTNL();
2473
2474 if ((idev = ipv6_find_idev(dev)) == NULL) {
2475 printk(KERN_DEBUG "init gre: add_dev failed\n");
2476 return;
2477 }
2478
2479 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2480 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2481
2482 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2483 addrconf_add_linklocal(idev, &addr);
2484}
2485#endif
2486
1da177e4
LT		 2487static inline int
2488ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2489{
2490 struct in6_addr lladdr;
2491
95c385b4 2492 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2493 addrconf_add_linklocal(idev, &lladdr);
2494 return 0;
2495 }
2496 return -1;
2497}
2498
2499static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2500{
2501 struct net_device *link_dev;
c346dca1 2502 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2503
2504 /* first try to inherit the link-local address from the link device */
2505 if (idev->dev->iflink &&
6fda7350 2506 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2507 if (!ipv6_inherit_linklocal(idev, link_dev))
2508 return;
2509 }
2510 /* then try to inherit it from any device */
6fda7350 2511 for_each_netdev(net, link_dev) {
1da177e4
LT		 2512 if (!ipv6_inherit_linklocal(idev, link_dev))
2513 return;
2514 }
2515 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2516}
2517
2518/*
2519 * Autoconfigure tunnel with a link-local address so routing protocols,
2520 * DHCPv6, MLD etc. can be run over the virtual link
2521 */
2522
2523static void addrconf_ip6_tnl_config(struct net_device *dev)
2524{
2525 struct inet6_dev *idev;
2526
2527 ASSERT_RTNL();
2528
e21e8467 2529 idev = addrconf_add_dev(dev);
64e724f6 2530 if (IS_ERR(idev)) {
1da177e4
LT		 2531 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2532 return;
2533 }
2534 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2535}
2536
1ab1457c 2537static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2538 void * data)
2539{
2540 struct net_device *dev = (struct net_device *) data;
74235a25 2541 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2542 int run_pending = 0;
b217d616 2543 int err;
1da177e4 2544
e21e8467 2545 switch (event) {
45ba9dd2 2546 case NETDEV_REGISTER:
74235a25 2547 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2548 idev = ipv6_add_dev(dev);
2549 if (!idev)
b217d616 2550 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2551 }
2552 break;
bcdd553f 2553
1da177e4 2554 case NETDEV_UP:
3c21edbd 2555 case NETDEV_CHANGE:
c2edacf8
JV		 2556 if (dev->flags & IFF_SLAVE)
2557 break;
2558
3c21edbd 2559 if (event == NETDEV_UP) {
f24e3d65 2560 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2561 /* device is not ready yet. */
2562 printk(KERN_INFO
2563 "ADDRCONF(NETDEV_UP): %s: "
2564 "link is not ready\n",
2565 dev->name);
2566 break;
2567 }
99081049 2568
d31c7b8f
EP		 2569 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2570 idev = ipv6_add_dev(dev);
2571
e3ec6cfc 2572 if (idev) {
99081049 2573 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2574 run_pending = 1;
2575 }
3c21edbd 2576 } else {
f24e3d65 2577 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2578 /* device is still not ready. */
2579 break;
2580 }
2581
2582 if (idev) {
bcdd553f 2583 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2584 /* device is already configured. */
2585 break;
3c21edbd
YH		 2586 idev->if_flags |= IF_READY;
2587 }
2588
2589 printk(KERN_INFO
2590 "ADDRCONF(NETDEV_CHANGE): %s: "
2591 "link becomes ready\n",
2592 dev->name);
2593
c5e33bdd 2594 run_pending = 1;
3c21edbd
YH		 2595 }
2596
e21e8467 2597 switch (dev->type) {
0be669bb 2598#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2599 case ARPHRD_SIT:
2600 addrconf_sit_config(dev);
2601 break;
aee80b54 2602#endif
2603#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2604 case ARPHRD_IPGRE:
2605 addrconf_gre_config(dev);
2606 break;
0be669bb 2607#endif
1da177e4
LT		 2608 case ARPHRD_TUNNEL6:
2609 addrconf_ip6_tnl_config(dev);
2610 break;
2611 case ARPHRD_LOOPBACK:
2612 init_loopback(dev);
2613 break;
2614
2615 default:
2616 addrconf_dev_config(dev);
2617 break;
3ff50b79 2618 }
bcdd553f 2619
1da177e4 2620 if (idev) {
c5e33bdd
YH		 2621 if (run_pending)
2622 addrconf_dad_run(idev);
2623
bcdd553f
SH		 2624 /*
2625 * If the MTU changed during the interface down,
2626 * when the interface up, the changed MTU must be
2627 * reflected in the idev as well as routers.
1da177e4 2628 */
bcdd553f
SH		 2629 if (idev->cnf.mtu6 != dev->mtu &&
2630 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2631 rt6_mtu_change(dev, dev->mtu);
2632 idev->cnf.mtu6 = dev->mtu;
2633 }
2634 idev->tstamp = jiffies;
2635 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2636
2637 /*
2638 * If the changed mtu during down is lower than
2639 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2640 */
2641 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2642 addrconf_ifdown(dev, 1);
1da177e4
LT		 2643 }
2644 break;
2645
2646 case NETDEV_CHANGEMTU:
d31c7b8f 2647 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2648 rt6_mtu_change(dev, dev->mtu);
2649 idev->cnf.mtu6 = dev->mtu;
2650 break;
2651 }
2652
d31c7b8f
EP		 2653 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2654 idev = ipv6_add_dev(dev);
2655 if (idev)
2656 break;
2657 }
2658
bcdd553f
SH		 2659 /*
2660 * MTU falled under IPV6_MIN_MTU.
2661 * Stop IPv6 on this interface.
2662 */
1da177e4
LT		 2663
2664 case NETDEV_DOWN:
2665 case NETDEV_UNREGISTER:
2666 /*
2667 * Remove all addresses from this interface.
2668 */
2669 addrconf_ifdown(dev, event != NETDEV_DOWN);
2670 break;
3c21edbd 2671
1da177e4 2672 case NETDEV_CHANGENAME:
1da177e4 2673 if (idev) {
5632c515 2674 snmp6_unregister_dev(idev);
408c4768 2675 addrconf_sysctl_unregister(idev);
f52295a9 2676 addrconf_sysctl_register(idev);
b217d616
HX		 2677 err = snmp6_register_dev(idev);
2678 if (err)
2679 return notifier_from_errno(err);
5632c515 2680 }
1da177e4 2681 break;
bcdd553f 2682
93d9b7d7
JP		 2683 case NETDEV_PRE_TYPE_CHANGE:
2684 case NETDEV_POST_TYPE_CHANGE:
2685 addrconf_type_change(dev, event);
75c78500 2686 break;
3ff50b79 2687 }
1da177e4
LT		 2688
2689 return NOTIFY_OK;
2690}
2691
2692/*
2693 * addrconf module should be notified of a device going up
2694 */
2695static struct notifier_block ipv6_dev_notf = {
2696 .notifier_call = addrconf_notify,
1da177e4
LT		 2697};
2698
93d9b7d7 2699static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2700{
2701 struct inet6_dev *idev;
2702 ASSERT_RTNL();
2703
2704 idev = __in6_dev_get(dev);
2705
93d9b7d7 2706 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2707 ipv6_mc_remap(idev);
93d9b7d7 2708 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2709 ipv6_mc_unmap(idev);
2710}
2711
1da177e4
LT		 2712static int addrconf_ifdown(struct net_device *dev, int how)
2713{
c346dca1 2714 struct net *net = dev_net(dev);
502a2ffd 2715 struct inet6_dev *idev;
2716 struct inet6_ifaddr *ifa;
73a8bd74 2717 int state, i;
1da177e4
LT		 2718
2719 ASSERT_RTNL();
2720
73a8bd74
DM		 2721 rt6_ifdown(net, dev);
2722 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2723
2724 idev = __in6_dev_get(dev);
2725 if (idev == NULL)
2726 return -ENODEV;
2727
bcdd553f
SH		 2728 /*
2729 * Step 1: remove reference to ipv6 device from parent device.
2730 * Do not dev_put!
1da177e4 2731 */
439e2385 2732 if (how) {
1da177e4 2733 idev->dead = 1;
8814c4b5
YH		 2734
2735 /* protected by rtnl_lock */
a9b3cd7f 2736 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2737
2738 /* Step 1.5: remove snmp6 entry */
2739 snmp6_unregister_dev(idev);
2740
2741 }
2742
73a8bd74
DM		 2743 /* Step 2: clear hash table */
2744 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2745 struct hlist_head *h = &inet6_addr_lst[i];
2746 struct hlist_node *n;
2747
2748 spin_lock_bh(&addrconf_hash_lock);
2749 restart:
2750 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2751 if (ifa->idev == idev) {
2752 hlist_del_init_rcu(&ifa->addr_lst);
2753 addrconf_del_timer(ifa);
2754 goto restart;
2755 }
2756 }
2757 spin_unlock_bh(&addrconf_hash_lock);
2758 }
2759
1da177e4
LT		 2760 write_lock_bh(&idev->lock);
2761
bcdd553f 2762 /* Step 2: clear flags for stateless addrconf */
439e2385 2763 if (!how)
3c21edbd 2764 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2765
1da177e4 2766#ifdef CONFIG_IPV6_PRIVACY
439e2385 2767 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2768 in6_dev_put(idev);
2769
bcdd553f 2770 /* Step 3: clear tempaddr list */
372e6c8f 2771 while (!list_empty(&idev->tempaddr_list)) {
2772 ifa = list_first_entry(&idev->tempaddr_list,
2773 struct inet6_ifaddr, tmp_list);
2774 list_del(&ifa->tmp_list);
1da177e4
LT		 2775 write_unlock_bh(&idev->lock);
2776 spin_lock_bh(&ifa->lock);
2777
2778 if (ifa->ifpub) {
2779 in6_ifa_put(ifa->ifpub);
2780 ifa->ifpub = NULL;
2781 }
2782 spin_unlock_bh(&ifa->lock);
2783 in6_ifa_put(ifa);
2784 write_lock_bh(&idev->lock);
2785 }
2786#endif
8f37ada5 2787
502a2ffd 2788 while (!list_empty(&idev->addr_list)) {
2789 ifa = list_first_entry(&idev->addr_list,
2790 struct inet6_ifaddr, if_list);
84e8b803 2791 addrconf_del_timer(ifa);
2792
73a8bd74 2793 list_del(&ifa->if_list);
84e8b803 2794
73a8bd74 2795 write_unlock_bh(&idev->lock);
84e8b803 2796
73a8bd74
DM		 2797 spin_lock_bh(&ifa->state_lock);
2798 state = ifa->state;
2799 ifa->state = INET6_IFADDR_STATE_DEAD;
2800 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2801
73a8bd74
DM		 2802 if (state != INET6_IFADDR_STATE_DEAD) {
2803 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2804 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2805 }
73a8bd74 2806 in6_ifa_put(ifa);
8f37ada5 2807
73a8bd74
DM		 2808 write_lock_bh(&idev->lock);
2809 }
8f37ada5 2810
1da177e4
LT		 2811 write_unlock_bh(&idev->lock);
2812
2813 /* Step 5: Discard multicast list */
439e2385 2814 if (how)
1da177e4
LT		 2815 ipv6_mc_destroy_dev(idev);
2816 else
2817 ipv6_mc_down(idev);
2818
1da177e4 2819 idev->tstamp = jiffies;
1ab1457c 2820
bcdd553f 2821 /* Last: Shot the device (if unregistered) */
439e2385 2822 if (how) {
408c4768 2823 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2824 neigh_parms_release(&nd_tbl, idev->nd_parms);
2825 neigh_ifdown(&nd_tbl, dev);
2826 in6_dev_put(idev);
2827 }
2828 return 0;
2829}
2830
2831static void addrconf_rs_timer(unsigned long data)
2832{
2833 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2834 struct inet6_dev *idev = ifp->idev;
1da177e4 2835
5b2a1953 2836 read_lock(&idev->lock);
2837 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2838 goto out;
2839
5b2a1953 2840 if (idev->cnf.forwarding)
2841 goto out;
2842
2843 /* Announcement received after solicitation was sent */
2844 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2845 goto out;
1da177e4
LT		 2846
2847 spin_lock(&ifp->lock);
5b2a1953 2848 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2849 /* The wait after the last probe can be shorter */
2850 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2851 (ifp->probes == idev->cnf.rtr_solicits) ?
2852 idev->cnf.rtr_solicit_delay :
2853 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2854 spin_unlock(&ifp->lock);
2855
5b2a1953 2856 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2857 } else {
2858 spin_unlock(&ifp->lock);
2859 /*
2860 * Note: we do not support deprecated "all on-link"
2861 * assumption any longer.
2862 */
2863 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2864 idev->dev->name);
1da177e4
LT		 2865 }
2866
2867out:
5b2a1953 2868 read_unlock(&idev->lock);
1da177e4
LT		 2869 in6_ifa_put(ifp);
2870}
2871
2872/*
2873 * Duplicate Address Detection
2874 */
3c21edbd
YH		 2875static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2876{
2877 unsigned long rand_num;
2878 struct inet6_dev *idev = ifp->idev;
2879
95c385b4
NH		 2880 if (ifp->flags & IFA_F_OPTIMISTIC)
2881 rand_num = 0;
2882 else
2883 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2884
3c21edbd
YH		 2885 ifp->probes = idev->cnf.dad_transmits;
2886 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2887}
2888
e431b8c0 2889static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2890{
2891 struct inet6_dev *idev = ifp->idev;
2892 struct net_device *dev = idev->dev;
1da177e4
LT		 2893
2894 addrconf_join_solict(dev, &ifp->addr);
2895
1da177e4 2896 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2897
2898 read_lock_bh(&idev->lock);
622ccdf1 2899 spin_lock(&ifp->lock);
e9d3e084 2900 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2901 goto out;
1da177e4
LT		 2902
2903 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2904 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2905 !(ifp->flags&IFA_F_TENTATIVE) ||
2906 ifp->flags & IFA_F_NODAD) {
cc411d0b 2907 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2908 spin_unlock(&ifp->lock);
1da177e4
LT		 2909 read_unlock_bh(&idev->lock);
2910
2911 addrconf_dad_completed(ifp);
2912 return;
2913 }
2914
6732bade 2915 if (!(idev->if_flags & IF_READY)) {
21809faf 2916 spin_unlock(&ifp->lock);
6732bade 2917 read_unlock_bh(&idev->lock);
3c21edbd 2918 /*
590a9887 2919 * If the device is not ready:
3c21edbd
YH		 2920 * - keep it tentative if it is a permanent address.
2921 * - otherwise, kill it.
2922 */
2923 in6_ifa_hold(ifp);
cc411d0b 2924 addrconf_dad_stop(ifp, 0);
6732bade 2925 return;
3c21edbd 2926 }
95c385b4
NH		 2927
2928 /*
2929 * Optimistic nodes can start receiving
2930 * Frames right away
2931 */
e21e8467 2932 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2933 ip6_ins_rt(ifp->rt);
2934
6732bade 2935 addrconf_dad_kick(ifp);
1da177e4 2936out:
622ccdf1 2937 spin_unlock(&ifp->lock);
1da177e4
LT		 2938 read_unlock_bh(&idev->lock);
2939}
2940
2941static void addrconf_dad_timer(unsigned long data)
2942{
2943 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2944 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2945 struct in6_addr mcaddr;
2946
f2344a13
HX		 2947 if (!ifp->probes && addrconf_dad_end(ifp))
2948 goto out;
2949
122e4519 2950 read_lock(&idev->lock);
2951 if (idev->dead || !(idev->if_flags & IF_READY)) {
2952 read_unlock(&idev->lock);
1da177e4
LT		 2953 goto out;
2954 }
21809faf 2955
2956 spin_lock(&ifp->lock);
622ccdf1
HX		 2957 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2958 spin_unlock(&ifp->lock);
2959 read_unlock(&idev->lock);
2960 goto out;
2961 }
2962
1da177e4
LT		 2963 if (ifp->probes == 0) {
2964 /*
2965 * DAD was successful
2966 */
2967
cc411d0b 2968 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2969 spin_unlock(&ifp->lock);
122e4519 2970 read_unlock(&idev->lock);
1da177e4
LT		 2971
2972 addrconf_dad_completed(ifp);
2973
2974 goto out;
2975 }
2976
2977 ifp->probes--;
2978 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2979 spin_unlock(&ifp->lock);
122e4519 2980 read_unlock(&idev->lock);
1da177e4
LT		 2981
2982 /* send a neighbour solicitation for our addr */
1da177e4 2983 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2984 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2985out:
2986 in6_ifa_put(ifp);
2987}
2988
2989static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2990{
e21e8467 2991 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2992
2993 /*
2994 * Configure the address for reception. Now it is valid.
2995 */
2996
2997 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2998
2999 /* If added prefix is link local and forwarding is off,
3000 start sending router solicitations.
3001 */
3002
c3bccac2
TG		 3003 if ((ifp->idev->cnf.forwarding == 0 ||
3004 ifp->idev->cnf.forwarding == 2) &&
1da177e4
LT		 3005 ifp->idev->cnf.rtr_solicits > 0 &&
3006 (dev->flags&IFF_LOOPBACK) == 0 &&
3007 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3008 /*
3009 * If a host as already performed a random delay
3010 * [...] as part of DAD [...] there is no need
3011 * to delay again before sending the first RS
3012 */
f3ee4010 3013 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3014
3015 spin_lock_bh(&ifp->lock);
3016 ifp->probes = 1;
3017 ifp->idev->if_flags |= IF_RS_SENT;
3018 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3019 spin_unlock_bh(&ifp->lock);
3020 }
3021}
3022
e21e8467
SH		 3023static void addrconf_dad_run(struct inet6_dev *idev)
3024{
c5e33bdd
YH		 3025 struct inet6_ifaddr *ifp;
3026
3027 read_lock_bh(&idev->lock);
502a2ffd 3028 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3029 spin_lock(&ifp->lock);
f2344a13
HX		 3030 if (ifp->flags & IFA_F_TENTATIVE &&
3031 ifp->state == INET6_IFADDR_STATE_DAD)
3032 addrconf_dad_kick(ifp);
21809faf 3033 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3034 }
3035 read_unlock_bh(&idev->lock);
3036}
3037
1da177e4
LT		 3038#ifdef CONFIG_PROC_FS
3039struct if6_iter_state {
3c40090a 3040 struct seq_net_private p;
1da177e4
LT		 3041 int bucket;
3042};
3043
3044static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3045{
3046 struct inet6_ifaddr *ifa = NULL;
3047 struct if6_iter_state *state = seq->private;
1218854a 3048 struct net *net = seq_file_net(seq);
1da177e4
LT		 3049
3050 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3051 struct hlist_node *n;
4f70ecca 3052 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 3053 addr_lst)
c2e21293 3054 if (net_eq(dev_net(ifa->idev->dev), net))
3055 return ifa;
1da177e4 3056 }
c2e21293 3057 return NULL;
1da177e4
LT		 3058}
3059
c2e21293 3060static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3061 struct inet6_ifaddr *ifa)
1da177e4
LT		 3062{
3063 struct if6_iter_state *state = seq->private;
1218854a 3064 struct net *net = seq_file_net(seq);
c2e21293 3065 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3066
4f70ecca 3067 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 3068 if (net_eq(dev_net(ifa->idev->dev), net))
3069 return ifa;
3c40090a 3070
c2e21293 3071 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3072 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3073 &inet6_addr_lst[state->bucket], addr_lst) {
3074 if (net_eq(dev_net(ifa->idev->dev), net))
3075 return ifa;
3076 }
1da177e4 3077 }
3c40090a 3078
c2e21293 3079 return NULL;
1da177e4
LT		 3080}
3081
3082static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3083{
3084 struct inet6_ifaddr *ifa = if6_get_first(seq);
3085
3086 if (ifa)
e21e8467 3087 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3088 --pos;
3089 return pos ? NULL : ifa;
3090}
3091
3092static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3093 __acquires(rcu_bh)
1da177e4 3094{
5c578aed 3095 rcu_read_lock_bh();
1da177e4
LT		 3096 return if6_get_idx(seq, *pos);
3097}
3098
3099static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3100{
3101 struct inet6_ifaddr *ifa;
3102
3103 ifa = if6_get_next(seq, v);
3104 ++*pos;
3105 return ifa;
3106}
3107
3108static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3109 __releases(rcu_bh)
1da177e4 3110{
5c578aed 3111 rcu_read_unlock_bh();
1da177e4
LT		 3112}
3113
3114static int if6_seq_show(struct seq_file *seq, void *v)
3115{
3116 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3117 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3118 &ifp->addr,
1da177e4
LT		 3119 ifp->idev->dev->ifindex,
3120 ifp->prefix_len,
3121 ifp->scope,
3122 ifp->flags,
3123 ifp->idev->dev->name);
3124 return 0;
3125}
3126
56b3d975 3127static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3128 .start = if6_seq_start,
3129 .next = if6_seq_next,
3130 .show = if6_seq_show,
3131 .stop = if6_seq_stop,
3132};
3133
3134static int if6_seq_open(struct inode *inode, struct file *file)
3135{
3c40090a
DL		 3136 return seq_open_net(inode, file, &if6_seq_ops,
3137 sizeof(struct if6_iter_state));
1da177e4
LT		 3138}
3139
9a32144e 3140static const struct file_operations if6_fops = {
1da177e4
LT		 3141 .owner = THIS_MODULE,
3142 .open = if6_seq_open,
3143 .read = seq_read,
3144 .llseek = seq_lseek,
3c40090a 3145 .release = seq_release_net,
1da177e4
LT		 3146};
3147
2c8c1e72 3148static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3149{
3c40090a 3150 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3151 return -ENOMEM;
3152 return 0;
3153}
3154
2c8c1e72 3155static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3156{
3157 proc_net_remove(net, "if_inet6");
3158}
3159
3160static struct pernet_operations if6_proc_net_ops = {
3161 .init = if6_proc_net_init,
3162 .exit = if6_proc_net_exit,
3163};
3164
3165int __init if6_proc_init(void)
3166{
3167 return register_pernet_subsys(&if6_proc_net_ops);
3168}
3169
1da177e4
LT		 3170void if6_proc_exit(void)
3171{
3c40090a 3172 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3173}
3174#endif /* CONFIG_PROC_FS */
3175
59fbb3a6 3176#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3177/* Check if address is a home address configured on any interface. */
b71d1d42 3178int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3179{
3180 int ret = 0;
c2e21293 3181 struct inet6_ifaddr *ifp = NULL;
3182 struct hlist_node *n;
3a88a81d 3183 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3184
5c578aed 3185 rcu_read_lock_bh();
4f70ecca 3186 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3187 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3188 continue;
caad295f 3189 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3190 (ifp->flags & IFA_F_HOMEADDRESS)) {
3191 ret = 1;
3192 break;
3193 }
3194 }
5c578aed 3195 rcu_read_unlock_bh();
3b9f9a1c
NT		 3196 return ret;
3197}
3198#endif
3199
1da177e4
LT		 3200/*
3201 * Periodic address status verification
3202 */
3203
3204static void addrconf_verify(unsigned long foo)
3205{
b2db7564 3206 unsigned long now, next, next_sec, next_sched;
1da177e4 3207 struct inet6_ifaddr *ifp;
c2e21293 3208 struct hlist_node *node;
1da177e4
LT		 3209 int i;
3210
5c578aed 3211 rcu_read_lock_bh();
3212 spin_lock(&addrconf_verify_lock);
1da177e4 3213 now = jiffies;
b2db7564 3214 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3215
3216 del_timer(&addr_chk_timer);
3217
bcdd553f 3218 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3219restart:
4f70ecca 3220 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3221 &inet6_addr_lst[i], addr_lst) {
1da177e4 3222 unsigned long age;
1da177e4
LT		 3223
3224 if (ifp->flags & IFA_F_PERMANENT)
3225 continue;
3226
3227 spin_lock(&ifp->lock);
b2db7564
YH		 3228 /* We try to batch several events at once. */
3229 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3230
8f27ebb9
YH		 3231 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3232 age >= ifp->valid_lft) {
1da177e4
LT		 3233 spin_unlock(&ifp->lock);
3234 in6_ifa_hold(ifp);
1da177e4
LT		 3235 ipv6_del_addr(ifp);
3236 goto restart;
8f27ebb9
YH		 3237 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3238 spin_unlock(&ifp->lock);
3239 continue;
1da177e4 3240 } else if (age >= ifp->prefered_lft) {
a1ed0526 3241 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3242 int deprecate = 0;
3243
3244 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3245 deprecate = 1;
3246 ifp->flags |= IFA_F_DEPRECATED;
3247 }
3248
3249 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3250 next = ifp->tstamp + ifp->valid_lft * HZ;
3251
3252 spin_unlock(&ifp->lock);
3253
3254 if (deprecate) {
3255 in6_ifa_hold(ifp);
1da177e4
LT		 3256
3257 ipv6_ifa_notify(0, ifp);
3258 in6_ifa_put(ifp);
3259 goto restart;
3260 }
3261#ifdef CONFIG_IPV6_PRIVACY
3262 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3263 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3264 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3265 ifp->idev->cnf.dad_transmits *
3266 ifp->idev->nd_parms->retrans_time / HZ;
3267
1da177e4
LT		 3268 if (age >= ifp->prefered_lft - regen_advance) {
3269 struct inet6_ifaddr *ifpub = ifp->ifpub;
3270 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3271 next = ifp->tstamp + ifp->prefered_lft * HZ;
3272 if (!ifp->regen_count && ifpub) {
3273 ifp->regen_count++;
3274 in6_ifa_hold(ifp);
3275 in6_ifa_hold(ifpub);
3276 spin_unlock(&ifp->lock);
5c578aed 3277
291d809b
HY		 3278 spin_lock(&ifpub->lock);
3279 ifpub->regen_count = 0;
3280 spin_unlock(&ifpub->lock);
1da177e4
LT		 3281 ipv6_create_tempaddr(ifpub, ifp);
3282 in6_ifa_put(ifpub);
3283 in6_ifa_put(ifp);
3284 goto restart;
3285 }
3286 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3287 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3288 spin_unlock(&ifp->lock);
3289#endif
3290 } else {
3291 /* ifp->prefered_lft <= ifp->valid_lft */
3292 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3293 next = ifp->tstamp + ifp->prefered_lft * HZ;
3294 spin_unlock(&ifp->lock);
3295 }
3296 }
1da177e4
LT		 3297 }
3298
b2db7564
YH		 3299 next_sec = round_jiffies_up(next);
3300 next_sched = next;
3301
3302 /* If rounded timeout is accurate enough, accept it. */
3303 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3304 next_sched = next_sec;
3305
3306 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3307 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3308 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3309
3310 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3311 now, next, next_sec, next_sched));
3312
3313 addr_chk_timer.expires = next_sched;
1da177e4 3314 add_timer(&addr_chk_timer);
5c578aed 3315 spin_unlock(&addrconf_verify_lock);
3316 rcu_read_unlock_bh();
1da177e4
LT		 3317}
3318
461d8837
TG		 3319static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3320{
3321 struct in6_addr *pfx = NULL;
3322
3323 if (addr)
3324 pfx = nla_data(addr);
3325
3326 if (local) {
3327 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3328 pfx = NULL;
3329 else
3330 pfx = nla_data(local);
3331 }
3332
3333 return pfx;
3334}
3335
ef7c79ed 3336static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3337 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3338 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3339 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3340};
3341
1da177e4
LT		 3342static int
3343inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3344{
3b1e0a65 3345 struct net *net = sock_net(skb->sk);
b933f716
TG		 3346 struct ifaddrmsg *ifm;
3347 struct nlattr *tb[IFA_MAX+1];
1da177e4 3348 struct in6_addr *pfx;
b933f716 3349 int err;
1da177e4 3350
b933f716
TG		 3351 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3352 if (err < 0)
3353 return err;
3354
3355 ifm = nlmsg_data(nlh);
3356 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3357 if (pfx == NULL)
3358 return -EINVAL;
3359
af284937 3360 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3361}
3362
55ebaef1
NT		 3363static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3364 u32 prefered_lft, u32 valid_lft)
081bba5b 3365{
6f704992
YH		 3366 u32 flags;
3367 clock_t expires;
4bed72e4 3368 unsigned long timeout;
46d48046 3369
081bba5b
NT		 3370 if (!valid_lft || (prefered_lft > valid_lft))
3371 return -EINVAL;
3372
4bed72e4
YH		 3373 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3374 if (addrconf_finite_timeout(timeout)) {
3375 expires = jiffies_to_clock_t(timeout * HZ);
3376 valid_lft = timeout;
6f704992 3377 flags = RTF_EXPIRES;
4bed72e4
YH		 3378 } else {
3379 expires = 0;
3380 flags = 0;
3381 ifa_flags |= IFA_F_PERMANENT;
6f704992 3382 }
081bba5b 3383
4bed72e4
YH		 3384 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3385 if (addrconf_finite_timeout(timeout)) {
3386 if (timeout == 0)
3387 ifa_flags |= IFA_F_DEPRECATED;
3388 prefered_lft = timeout;
3389 }
081bba5b
NT		 3390
3391 spin_lock_bh(&ifp->lock);
3b9f9a1c 3392 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3393 ifp->tstamp = jiffies;
3394 ifp->valid_lft = valid_lft;
3395 ifp->prefered_lft = prefered_lft;
3396
3397 spin_unlock_bh(&ifp->lock);
3398 if (!(ifp->flags&IFA_F_TENTATIVE))
3399 ipv6_ifa_notify(0, ifp);
081bba5b 3400
46d48046 3401 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3402 expires, flags);
081bba5b
NT		 3403 addrconf_verify(0);
3404
3405 return 0;
3406}
3407
1da177e4
LT		 3408static int
3409inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3410{
3b1e0a65 3411 struct net *net = sock_net(skb->sk);
461d8837
TG		 3412 struct ifaddrmsg *ifm;
3413 struct nlattr *tb[IFA_MAX+1];
1da177e4 3414 struct in6_addr *pfx;
7198f8ce
TG		 3415 struct inet6_ifaddr *ifa;
3416 struct net_device *dev;
55ebaef1
NT		 3417 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3418 u8 ifa_flags;
461d8837 3419 int err;
1da177e4 3420
461d8837
TG		 3421 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3422 if (err < 0)
3423 return err;
3424
3425 ifm = nlmsg_data(nlh);
3426 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3427 if (pfx == NULL)
3428 return -EINVAL;
3429
461d8837 3430 if (tb[IFA_CACHEINFO]) {
0778769d 3431 struct ifa_cacheinfo *ci;
461d8837
TG		 3432
3433 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3434 valid_lft = ci->ifa_valid;
461d8837
TG		 3435 preferred_lft = ci->ifa_prefered;
3436 } else {
3437 preferred_lft = INFINITY_LIFE_TIME;
3438 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3439 }
3440
af284937 3441 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3442 if (dev == NULL)
3443 return -ENODEV;
3444
55ebaef1 3445 /* We ignore other flags so far. */
3b9f9a1c 3446 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3447
1cab3da6 3448 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3449 if (ifa == NULL) {
3450 /*
3451 * It would be best to check for !NLM_F_CREATE here but
3452 * userspace alreay relies on not having to provide this.
3453 */
af284937
DL		 3454 return inet6_addr_add(net, ifm->ifa_index, pfx,
3455 ifm->ifa_prefixlen, ifa_flags,
3456 preferred_lft, valid_lft);
081bba5b
NT		 3457 }
3458
7198f8ce
TG		 3459 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3460 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3461 err = -EEXIST;
3462 else
55ebaef1 3463 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3464
3465 in6_ifa_put(ifa);
3466
3467 return err;
1da177e4
LT		 3468}
3469
101bb229
TG		 3470static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3471 u8 scope, int ifindex)
3472{
3473 struct ifaddrmsg *ifm;
3474
3475 ifm = nlmsg_data(nlh);
3476 ifm->ifa_family = AF_INET6;
3477 ifm->ifa_prefixlen = prefixlen;
3478 ifm->ifa_flags = flags;
3479 ifm->ifa_scope = scope;
3480 ifm->ifa_index = ifindex;
3481}
3482
85486af0
TG		 3483static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3484 unsigned long tstamp, u32 preferred, u32 valid)
3485{
3486 struct ifa_cacheinfo ci;
3487
18a31e1e
TG		 3488 ci.cstamp = cstamp_delta(cstamp);
3489 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3490 ci.ifa_prefered = preferred;
3491 ci.ifa_valid = valid;
3492
3493 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3494}
3495
101bb229
TG		 3496static inline int rt_scope(int ifa_scope)
3497{
3498 if (ifa_scope & IFA_HOST)
3499 return RT_SCOPE_HOST;
3500 else if (ifa_scope & IFA_LINK)
3501 return RT_SCOPE_LINK;
3502 else if (ifa_scope & IFA_SITE)
3503 return RT_SCOPE_SITE;
3504 else
3505 return RT_SCOPE_UNIVERSE;
3506}
3507
0ab6803b
TG		 3508static inline int inet6_ifaddr_msgsize(void)
3509{
339bf98f
TG		 3510 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3511 + nla_total_size(16) /* IFA_ADDRESS */
3512 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3513}
c5396a31 3514
1da177e4 3515static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3516 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3517{
1da177e4 3518 struct nlmsghdr *nlh;
85486af0 3519 u32 preferred, valid;
1da177e4 3520
0ab6803b
TG		 3521 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3522 if (nlh == NULL)
26932566 3523 return -EMSGSIZE;
0ab6803b 3524
101bb229
TG		 3525 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3526 ifa->idev->dev->ifindex);
3527
1da177e4 3528 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3529 preferred = ifa->prefered_lft;
3530 valid = ifa->valid_lft;
3531 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3532 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3533 if (preferred > tval)
3534 preferred -= tval;
3535 else
3536 preferred = 0;
f56619fc
BH		 3537 if (valid != INFINITY_LIFE_TIME) {
3538 if (valid > tval)
3539 valid -= tval;
3540 else
3541 valid = 0;
3542 }
1da177e4
LT		 3543 }
3544 } else {
85486af0
TG		 3545 preferred = INFINITY_LIFE_TIME;
3546 valid = INFINITY_LIFE_TIME;
3547 }
3548
0ab6803b 3549 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3550 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3551 nlmsg_cancel(skb, nlh);
3552 return -EMSGSIZE;
3553 }
1da177e4 3554
0ab6803b 3555 return nlmsg_end(skb, nlh);
1da177e4
LT		 3556}
3557
3558static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3559 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3560{
1da177e4 3561 struct nlmsghdr *nlh;
101bb229
TG		 3562 u8 scope = RT_SCOPE_UNIVERSE;
3563 int ifindex = ifmca->idev->dev->ifindex;
3564
3565 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3566 scope = RT_SCOPE_SITE;
1da177e4 3567
0ab6803b
TG		 3568 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3569 if (nlh == NULL)
26932566 3570 return -EMSGSIZE;
85486af0 3571
0ab6803b
TG		 3572 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3573 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3574 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3575 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3576 nlmsg_cancel(skb, nlh);
3577 return -EMSGSIZE;
3578 }
85486af0 3579
0ab6803b 3580 return nlmsg_end(skb, nlh);
1da177e4
LT		 3581}
3582
3583static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3584 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3585{
1da177e4 3586 struct nlmsghdr *nlh;
101bb229
TG		 3587 u8 scope = RT_SCOPE_UNIVERSE;
3588 int ifindex = ifaca->aca_idev->dev->ifindex;
3589
3590 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3591 scope = RT_SCOPE_SITE;
1da177e4 3592
0ab6803b
TG		 3593 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3594 if (nlh == NULL)
26932566 3595 return -EMSGSIZE;
85486af0 3596
0ab6803b
TG		 3597 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3598 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3599 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3600 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3601 nlmsg_cancel(skb, nlh);
3602 return -EMSGSIZE;
3603 }
1da177e4 3604
0ab6803b 3605 return nlmsg_end(skb, nlh);
1da177e4
LT		 3606}
3607
e21e8467 3608enum addr_type_t {
1da177e4
LT		 3609 UNICAST_ADDR,
3610 MULTICAST_ADDR,
3611 ANYCAST_ADDR,
3612};
3613
234b27c3
ED		 3614/* called with rcu_read_lock() */
3615static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3616 struct netlink_callback *cb, enum addr_type_t type,
3617 int s_ip_idx, int *p_ip_idx)
3618{
234b27c3
ED		 3619 struct ifmcaddr6 *ifmca;
3620 struct ifacaddr6 *ifaca;
3621 int err = 1;
3622 int ip_idx = *p_ip_idx;
3623
3624 read_lock_bh(&idev->lock);
3625 switch (type) {
502a2ffd 3626 case UNICAST_ADDR: {
3627 struct inet6_ifaddr *ifa;
3628
234b27c3 3629 /* unicast address incl. temp addr */
502a2ffd 3630 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3631 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3632 continue;
3633 err = inet6_fill_ifaddr(skb, ifa,
3634 NETLINK_CB(cb->skb).pid,
3635 cb->nlh->nlmsg_seq,
3636 RTM_NEWADDR,
3637 NLM_F_MULTI);
3638 if (err <= 0)
3639 break;
3640 }
3641 break;
502a2ffd 3642 }
234b27c3
ED		 3643 case MULTICAST_ADDR:
3644 /* multicast address */
3645 for (ifmca = idev->mc_list; ifmca;
3646 ifmca = ifmca->next, ip_idx++) {
3647 if (ip_idx < s_ip_idx)
3648 continue;
3649 err = inet6_fill_ifmcaddr(skb, ifmca,
3650 NETLINK_CB(cb->skb).pid,
3651 cb->nlh->nlmsg_seq,
3652 RTM_GETMULTICAST,
3653 NLM_F_MULTI);
3654 if (err <= 0)
3655 break;
3656 }
3657 break;
3658 case ANYCAST_ADDR:
3659 /* anycast address */
3660 for (ifaca = idev->ac_list; ifaca;
3661 ifaca = ifaca->aca_next, ip_idx++) {
3662 if (ip_idx < s_ip_idx)
3663 continue;
3664 err = inet6_fill_ifacaddr(skb, ifaca,
3665 NETLINK_CB(cb->skb).pid,
3666 cb->nlh->nlmsg_seq,
3667 RTM_GETANYCAST,
3668 NLM_F_MULTI);
3669 if (err <= 0)
3670 break;
3671 }
3672 break;
3673 default:
3674 break;
3675 }
3676 read_unlock_bh(&idev->lock);
3677 *p_ip_idx = ip_idx;
3678 return err;
3679}
3680
1da177e4
LT		 3681static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3682 enum addr_type_t type)
3683{
234b27c3
ED		 3684 struct net *net = sock_net(skb->sk);
3685 int h, s_h;
1da177e4
LT		 3686 int idx, ip_idx;
3687 int s_idx, s_ip_idx;
1da177e4 3688 struct net_device *dev;
234b27c3
ED		 3689 struct inet6_dev *idev;
3690 struct hlist_head *head;
3691 struct hlist_node *node;
1ab1457c 3692
234b27c3
ED		 3693 s_h = cb->args[0];
3694 s_idx = idx = cb->args[1];
3695 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3696
234b27c3
ED		 3697 rcu_read_lock();
3698 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3699 idx = 0;
3700 head = &net->dev_index_head[h];
3701 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3702 if (idx < s_idx)
3703 goto cont;
4b97efdf 3704 if (h > s_h || idx > s_idx)
234b27c3
ED		 3705 s_ip_idx = 0;
3706 ip_idx = 0;
e21e8467
SH		 3707 idev = __in6_dev_get(dev);
3708 if (!idev)
234b27c3
ED		 3709 goto cont;
3710
3711 if (in6_dump_addrs(idev, skb, cb, type,
3712 s_ip_idx, &ip_idx) <= 0)
3713 goto done;
7562f876 3714cont:
234b27c3
ED		 3715 idx++;
3716 }
1da177e4 3717 }
234b27c3
ED		 3718done:
3719 rcu_read_unlock();
3720 cb->args[0] = h;
3721 cb->args[1] = idx;
3722 cb->args[2] = ip_idx;
3723
1da177e4
LT		 3724 return skb->len;
3725}
3726
3727static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3728{
3729 enum addr_type_t type = UNICAST_ADDR;
b854272b 3730
1da177e4
LT		 3731 return inet6_dump_addr(skb, cb, type);
3732}
3733
3734static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3735{
3736 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3737
1da177e4
LT		 3738 return inet6_dump_addr(skb, cb, type);
3739}
3740
3741
3742static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3743{
3744 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3745
1da177e4
LT		 3746 return inet6_dump_addr(skb, cb, type);
3747}
3748
1b29fc2c
TG		 3749static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3750 void *arg)
6c223828 3751{
3b1e0a65 3752 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3753 struct ifaddrmsg *ifm;
3754 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3755 struct in6_addr *addr = NULL;
3756 struct net_device *dev = NULL;
3757 struct inet6_ifaddr *ifa;
3758 struct sk_buff *skb;
6c223828
NT		 3759 int err;
3760
1b29fc2c
TG		 3761 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3762 if (err < 0)
3763 goto errout;
3764
3765 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3766 if (addr == NULL) {
3767 err = -EINVAL;
3768 goto errout;
6c223828 3769 }
6c223828 3770
1b29fc2c 3771 ifm = nlmsg_data(nlh);
6c223828 3772 if (ifm->ifa_index)
6fda7350 3773 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3774
e21e8467
SH		 3775 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3776 if (!ifa) {
1b29fc2c
TG		 3777 err = -EADDRNOTAVAIL;
3778 goto errout;
3779 }
6c223828 3780
e21e8467
SH		 3781 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3782 if (!skb) {
6c223828 3783 err = -ENOBUFS;
1b29fc2c 3784 goto errout_ifa;
6c223828
NT		 3785 }
3786
6c223828
NT		 3787 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3788 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3789 if (err < 0) {
3790 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3791 WARN_ON(err == -EMSGSIZE);
3792 kfree_skb(skb);
3793 goto errout_ifa;
3794 }
6fda7350 3795 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3796errout_ifa:
6c223828 3797 in6_ifa_put(ifa);
1b29fc2c 3798errout:
6c223828 3799 return err;
6c223828
NT		 3800}
3801
1da177e4
LT		 3802static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3803{
3804 struct sk_buff *skb;
c346dca1 3805 struct net *net = dev_net(ifa->idev->dev);
5d620266 3806 int err = -ENOBUFS;
1da177e4 3807
0ab6803b 3808 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3809 if (skb == NULL)
3810 goto errout;
3811
3812 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3813 if (err < 0) {
3814 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3815 WARN_ON(err == -EMSGSIZE);
3816 kfree_skb(skb);
3817 goto errout;
3818 }
1ce85fe4
PNA		 3819 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3820 return;
5d620266
TG		 3821errout:
3822 if (err < 0)
6fda7350 3823 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3824}
3825
b6f99a21 3826static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3827 __s32 *array, int bytes)
3828{
04561c1f
TG		 3829 BUG_ON(bytes < (DEVCONF_MAX * 4));
3830
1da177e4
LT		 3831 memset(array, 0, bytes);
3832 array[DEVCONF_FORWARDING] = cnf->forwarding;
3833 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3834 array[DEVCONF_MTU6] = cnf->mtu6;
3835 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3836 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3837 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3838 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3839 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3840 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3841 jiffies_to_msecs(cnf->rtr_solicit_interval);
3842 array[DEVCONF_RTR_SOLICIT_DELAY] =
3843 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3844 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3845#ifdef CONFIG_IPV6_PRIVACY
3846 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3847 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3848 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3849 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3850 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3851#endif
3852 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3853 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3854 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3855#ifdef CONFIG_IPV6_ROUTER_PREF
3856 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3857 array[DEVCONF_RTR_PROBE_INTERVAL] =
3858 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3859#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3860 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3861#endif
930d6ff2 3862#endif
fbea49e1 3863 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3864 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3865#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3866 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3867#endif
7bc570c8
YH		 3868#ifdef CONFIG_IPV6_MROUTE
3869 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3870#endif
778d80be 3871 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3872 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3873 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3874}
3875
b382b191
TG		 3876static inline size_t inet6_ifla6_size(void)
3877{
3878 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3879 + nla_total_size(sizeof(struct ifla_cacheinfo))
3880 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3881 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3882 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3883}
3884
339bf98f
TG		 3885static inline size_t inet6_if_nlmsg_size(void)
3886{
3887 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3888 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3889 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3890 + nla_total_size(4) /* IFLA_MTU */
3891 + nla_total_size(4) /* IFLA_LINK */
b382b191 3892 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3893}
c5396a31 3894
be281e55 3895static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 3896 int items, int bytes)
7f7d9a6b
HX		 3897{
3898 int i;
3899 int pad = bytes - sizeof(u64) * items;
3900 BUG_ON(pad < 0);
3901
3902 /* Use put_unaligned() because stats may not be aligned for u64. */
3903 put_unaligned(items, &stats[0]);
3904 for (i = 1; i < items; i++)
be281e55 3905 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 3906
3907 memset(&stats[items], 0, pad);
3908}
3909
4ce3c183
ED		 3910static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3911 int items, int bytes, size_t syncpoff)
3912{
3913 int i;
3914 int pad = bytes - sizeof(u64) * items;
3915 BUG_ON(pad < 0);
3916
3917 /* Use put_unaligned() because stats may not be aligned for u64. */
3918 put_unaligned(items, &stats[0]);
3919 for (i = 1; i < items; i++)
3920 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3921
3922 memset(&stats[items], 0, pad);
3923}
3924
7f7d9a6b
HX		 3925static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3926 int bytes)
3927{
e21e8467 3928 switch (attrtype) {
7f7d9a6b 3929 case IFLA_INET6_STATS:
4ce3c183
ED		 3930 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3931 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3932 break;
3933 case IFLA_INET6_ICMP6STATS:
be281e55 3934 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3935 break;
3936 }
3937}
3938
b382b191
TG		 3939static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3940{
3941 struct nlattr *nla;
3942 struct ifla_cacheinfo ci;
3943
3944 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3945
3946 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 3947 ci.tstamp = cstamp_delta(idev->tstamp);
3948 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3949 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
b382b191
TG		 3950 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3951
3952 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3953 if (nla == NULL)
3954 goto nla_put_failure;
3955 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3956
3957 /* XXX - MC not implemented */
3958
3959 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3960 if (nla == NULL)
3961 goto nla_put_failure;
3962 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3963
3964 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3965 if (nla == NULL)
3966 goto nla_put_failure;
3967 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3968
3969 return 0;
3970
3971nla_put_failure:
3972 return -EMSGSIZE;
3973}
3974
3975static size_t inet6_get_link_af_size(const struct net_device *dev)
3976{
3977 if (!__in6_dev_get(dev))
3978 return 0;
3979
3980 return inet6_ifla6_size();
3981}
3982
3983static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3984{
3985 struct inet6_dev *idev = __in6_dev_get(dev);
3986
3987 if (!idev)
3988 return -ENODATA;
3989
3990 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3991 return -EMSGSIZE;
3992
3993 return 0;
3994}
3995
1ab1457c 3996static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3997 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3998{
04561c1f 3999 struct net_device *dev = idev->dev;
04561c1f
TG		 4000 struct ifinfomsg *hdr;
4001 struct nlmsghdr *nlh;
4002 void *protoinfo;
04561c1f
TG		 4003
4004 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4005 if (nlh == NULL)
26932566 4006 return -EMSGSIZE;
04561c1f
TG		 4007
4008 hdr = nlmsg_data(nlh);
4009 hdr->ifi_family = AF_INET6;
4010 hdr->__ifi_pad = 0;
4011 hdr->ifi_type = dev->type;
4012 hdr->ifi_index = dev->ifindex;
4013 hdr->ifi_flags = dev_get_flags(dev);
4014 hdr->ifi_change = 0;
4015
4016 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 4017
4018 if (dev->addr_len)
04561c1f 4019 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 4020
04561c1f 4021 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 4022 if (dev->ifindex != dev->iflink)
04561c1f 4023 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 4024
04561c1f
TG		 4025 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4026 if (protoinfo == NULL)
4027 goto nla_put_failure;
1da177e4 4028
b382b191 4029 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4030 goto nla_put_failure;
1da177e4 4031
04561c1f
TG		 4032 nla_nest_end(skb, protoinfo);
4033 return nlmsg_end(skb, nlh);
1da177e4 4034
04561c1f 4035nla_put_failure:
26932566
PM		 4036 nlmsg_cancel(skb, nlh);
4037 return -EMSGSIZE;
1da177e4
LT		 4038}
4039
4040static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4041{
3b1e0a65 4042 struct net *net = sock_net(skb->sk);
84d2697d 4043 int h, s_h;
434a8a58 4044 int idx = 0, s_idx;
1da177e4
LT		 4045 struct net_device *dev;
4046 struct inet6_dev *idev;
84d2697d
ED		 4047 struct hlist_head *head;
4048 struct hlist_node *node;
1da177e4 4049
84d2697d
ED		 4050 s_h = cb->args[0];
4051 s_idx = cb->args[1];
4052
4053 rcu_read_lock();
4054 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4055 idx = 0;
4056 head = &net->dev_index_head[h];
4057 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4058 if (idx < s_idx)
4059 goto cont;
4060 idev = __in6_dev_get(dev);
4061 if (!idev)
4062 goto cont;
4063 if (inet6_fill_ifinfo(skb, idev,
4064 NETLINK_CB(cb->skb).pid,
4065 cb->nlh->nlmsg_seq,
4066 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4067 goto out;
7562f876 4068cont:
84d2697d
ED		 4069 idx++;
4070 }
1da177e4 4071 }
84d2697d
ED		 4072out:
4073 rcu_read_unlock();
4074 cb->args[1] = idx;
4075 cb->args[0] = h;
1da177e4
LT		 4076
4077 return skb->len;
4078}
4079
4080void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4081{
4082 struct sk_buff *skb;
c346dca1 4083 struct net *net = dev_net(idev->dev);
8d7a76c9 4084 int err = -ENOBUFS;
1ab1457c 4085
339bf98f 4086 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4087 if (skb == NULL)
4088 goto errout;
4089
4090 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4091 if (err < 0) {
4092 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4093 WARN_ON(err == -EMSGSIZE);
4094 kfree_skb(skb);
4095 goto errout;
4096 }
5f75a104 4097 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4098 return;
8d7a76c9
TG		 4099errout:
4100 if (err < 0)
5f75a104 4101 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4102}
4103
339bf98f
TG		 4104static inline size_t inet6_prefix_nlmsg_size(void)
4105{
4106 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4107 + nla_total_size(sizeof(struct in6_addr))
4108 + nla_total_size(sizeof(struct prefix_cacheinfo));
4109}
c5396a31 4110
1da177e4 4111static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4112 struct prefix_info *pinfo, u32 pid, u32 seq,
4113 int event, unsigned int flags)
1da177e4 4114{
6051e2f4
TG		 4115 struct prefixmsg *pmsg;
4116 struct nlmsghdr *nlh;
1da177e4
LT		 4117 struct prefix_cacheinfo ci;
4118
6051e2f4
TG		 4119 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4120 if (nlh == NULL)
26932566 4121 return -EMSGSIZE;
6051e2f4
TG		 4122
4123 pmsg = nlmsg_data(nlh);
1da177e4 4124 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4125 pmsg->prefix_pad1 = 0;
4126 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4127 pmsg->prefix_ifindex = idev->dev->ifindex;
4128 pmsg->prefix_len = pinfo->prefix_len;
4129 pmsg->prefix_type = pinfo->type;
8a47077a 4130 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4131 pmsg->prefix_flags = 0;
4132 if (pinfo->onlink)
4133 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4134 if (pinfo->autoconf)
4135 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4136
6051e2f4 4137 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4138
4139 ci.preferred_time = ntohl(pinfo->prefered);
4140 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4141 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4142
6051e2f4 4143 return nlmsg_end(skb, nlh);
1da177e4 4144
6051e2f4 4145nla_put_failure:
26932566
PM		 4146 nlmsg_cancel(skb, nlh);
4147 return -EMSGSIZE;
1da177e4
LT		 4148}
4149
1ab1457c 4150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4151 struct prefix_info *pinfo)
4152{
4153 struct sk_buff *skb;
c346dca1 4154 struct net *net = dev_net(idev->dev);
8c384bfa 4155 int err = -ENOBUFS;
1da177e4 4156
339bf98f 4157 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4158 if (skb == NULL)
4159 goto errout;
4160
4161 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4162 if (err < 0) {
4163 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4164 WARN_ON(err == -EMSGSIZE);
4165 kfree_skb(skb);
4166 goto errout;
4167 }
1ce85fe4
PNA		 4168 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4169 return;
8c384bfa
TG		 4170errout:
4171 if (err < 0)
6fda7350 4172 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4173}
4174
1da177e4
LT		 4175static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4176{
4177 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4178
4179 switch (event) {
4180 case RTM_NEWADDR:
95c385b4
NH		 4181 /*
4182 * If the address was optimistic
4183 * we inserted the route at the start of
4184 * our DAD process, so we don't need
4185 * to do it again
4186 */
4187 if (!(ifp->rt->rt6i_node))
4188 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4189 if (ifp->idev->cnf.forwarding)
4190 addrconf_join_anycast(ifp);
4191 break;
4192 case RTM_DELADDR:
4193 if (ifp->idev->cnf.forwarding)
4194 addrconf_leave_anycast(ifp);
4195 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4196 dst_hold(&ifp->rt->dst);
93fa159a 4197
73a8bd74 4198 if (ip6_del_rt(ifp->rt))
d8d1f30b 4199 dst_free(&ifp->rt->dst);
1da177e4
LT		 4200 break;
4201 }
4202}
4203
4204static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4205{
8814c4b5 4206 rcu_read_lock_bh();
1da177e4
LT		 4207 if (likely(ifp->idev->dead == 0))
4208 __ipv6_ifa_notify(event, ifp);
8814c4b5 4209 rcu_read_unlock_bh();
1da177e4
LT		 4210}
4211
4212#ifdef CONFIG_SYSCTL
4213
4214static
8d65af78 4215int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4216 void __user *buffer, size_t *lenp, loff_t *ppos)
4217{
4218 int *valp = ctl->data;
4219 int val = *valp;
88af182e 4220 loff_t pos = *ppos;
1da177e4
LT		 4221 int ret;
4222
8d65af78 4223 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4224
c8fecf22 4225 if (write)
b325fddb 4226 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4227 if (ret)
4228 *ppos = pos;
1ab1457c 4229 return ret;
1da177e4
LT		 4230}
4231
56d417b1
BH		 4232static void dev_disable_change(struct inet6_dev *idev)
4233{
4234 if (!idev || !idev->dev)
4235 return;
4236
4237 if (idev->cnf.disable_ipv6)
4238 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4239 else
4240 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4241}
4242
4243static void addrconf_disable_change(struct net *net, __s32 newf)
4244{
4245 struct net_device *dev;
4246 struct inet6_dev *idev;
4247
c6d14c84
ED		 4248 rcu_read_lock();
4249 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4250 idev = __in6_dev_get(dev);
4251 if (idev) {
4252 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4253 idev->cnf.disable_ipv6 = newf;
4254 if (changed)
4255 dev_disable_change(idev);
4256 }
56d417b1 4257 }
c6d14c84 4258 rcu_read_unlock();
56d417b1
BH		 4259}
4260
4261static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4262{
4263 struct net *net;
4264
4265 net = (struct net *)table->extra2;
4266
4267 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4268 return 0;
4269
88af182e
EB		 4270 if (!rtnl_trylock()) {
4271 /* Restore the original values before restarting */
4272 *p = old;
56d417b1 4273 return restart_syscall();
88af182e 4274 }
56d417b1
BH		 4275
4276 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4277 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4278 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4279 addrconf_disable_change(net, newf);
4280 } else if ((!*p) ^ (!old))
4281 dev_disable_change((struct inet6_dev *)table->extra1);
4282
4283 rtnl_unlock();
4284 return 0;
4285}
4286
4287static
8d65af78 4288int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4289 void __user *buffer, size_t *lenp, loff_t *ppos)
4290{
4291 int *valp = ctl->data;
4292 int val = *valp;
88af182e 4293 loff_t pos = *ppos;
56d417b1
BH		 4294 int ret;
4295
8d65af78 4296 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4297
4298 if (write)
4299 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4300 if (ret)
4301 *ppos = pos;
56d417b1
BH		 4302 return ret;
4303}
4304
1da177e4
LT		 4305static struct addrconf_sysctl_table
4306{
4307 struct ctl_table_header *sysctl_header;
f6a07b29 4308 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4309 char *dev_name;
ab32ea5d 4310} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4311 .sysctl_header = NULL,
4312 .addrconf_vars = {
1ab1457c 4313 {
e21e8467
SH		 4314 .procname = "forwarding",
4315 .data = &ipv6_devconf.forwarding,
4316 .maxlen = sizeof(int),
4317 .mode = 0644,
4318 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4319 },
4320 {
e21e8467
SH		 4321 .procname = "hop_limit",
4322 .data = &ipv6_devconf.hop_limit,
4323 .maxlen = sizeof(int),
4324 .mode = 0644,
4325 .proc_handler = proc_dointvec,
1da177e4
LT		 4326 },
4327 {
e21e8467
SH		 4328 .procname = "mtu",
4329 .data = &ipv6_devconf.mtu6,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
1da177e4
LT		 4333 },
4334 {
e21e8467
SH		 4335 .procname = "accept_ra",
4336 .data = &ipv6_devconf.accept_ra,
4337 .maxlen = sizeof(int),
4338 .mode = 0644,
4339 .proc_handler = proc_dointvec,
1da177e4
LT		 4340 },
4341 {
e21e8467
SH		 4342 .procname = "accept_redirects",
4343 .data = &ipv6_devconf.accept_redirects,
4344 .maxlen = sizeof(int),
4345 .mode = 0644,
4346 .proc_handler = proc_dointvec,
1da177e4
LT		 4347 },
4348 {
e21e8467
SH		 4349 .procname = "autoconf",
4350 .data = &ipv6_devconf.autoconf,
4351 .maxlen = sizeof(int),
4352 .mode = 0644,
4353 .proc_handler = proc_dointvec,
1da177e4
LT		 4354 },
4355 {
e21e8467
SH		 4356 .procname = "dad_transmits",
4357 .data = &ipv6_devconf.dad_transmits,
4358 .maxlen = sizeof(int),
4359 .mode = 0644,
4360 .proc_handler = proc_dointvec,
1da177e4
LT		 4361 },
4362 {
e21e8467
SH		 4363 .procname = "router_solicitations",
4364 .data = &ipv6_devconf.rtr_solicits,
4365 .maxlen = sizeof(int),
4366 .mode = 0644,
4367 .proc_handler = proc_dointvec,
1da177e4
LT		 4368 },
4369 {
e21e8467
SH		 4370 .procname = "router_solicitation_interval",
4371 .data = &ipv6_devconf.rtr_solicit_interval,
4372 .maxlen = sizeof(int),
4373 .mode = 0644,
4374 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4375 },
4376 {
e21e8467
SH		 4377 .procname = "router_solicitation_delay",
4378 .data = &ipv6_devconf.rtr_solicit_delay,
4379 .maxlen = sizeof(int),
4380 .mode = 0644,
4381 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4382 },
4383 {
e21e8467
SH		 4384 .procname = "force_mld_version",
4385 .data = &ipv6_devconf.force_mld_version,
4386 .maxlen = sizeof(int),
4387 .mode = 0644,
4388 .proc_handler = proc_dointvec,
1da177e4
LT		 4389 },
4390#ifdef CONFIG_IPV6_PRIVACY
4391 {
e21e8467
SH		 4392 .procname = "use_tempaddr",
4393 .data = &ipv6_devconf.use_tempaddr,
4394 .maxlen = sizeof(int),
4395 .mode = 0644,
4396 .proc_handler = proc_dointvec,
1da177e4
LT		 4397 },
4398 {
e21e8467
SH		 4399 .procname = "temp_valid_lft",
4400 .data = &ipv6_devconf.temp_valid_lft,
4401 .maxlen = sizeof(int),
4402 .mode = 0644,
4403 .proc_handler = proc_dointvec,
1da177e4
LT		 4404 },
4405 {
e21e8467
SH		 4406 .procname = "temp_prefered_lft",
4407 .data = &ipv6_devconf.temp_prefered_lft,
4408 .maxlen = sizeof(int),
4409 .mode = 0644,
4410 .proc_handler = proc_dointvec,
1da177e4
LT		 4411 },
4412 {
e21e8467
SH		 4413 .procname = "regen_max_retry",
4414 .data = &ipv6_devconf.regen_max_retry,
4415 .maxlen = sizeof(int),
4416 .mode = 0644,
4417 .proc_handler = proc_dointvec,
1da177e4
LT		 4418 },
4419 {
e21e8467
SH		 4420 .procname = "max_desync_factor",
4421 .data = &ipv6_devconf.max_desync_factor,
4422 .maxlen = sizeof(int),
4423 .mode = 0644,
4424 .proc_handler = proc_dointvec,
1da177e4
LT		 4425 },
4426#endif
4427 {
e21e8467
SH		 4428 .procname = "max_addresses",
4429 .data = &ipv6_devconf.max_addresses,
4430 .maxlen = sizeof(int),
4431 .mode = 0644,
4432 .proc_handler = proc_dointvec,
1da177e4 4433 },
65f5c7c1 4434 {
e21e8467
SH		 4435 .procname = "accept_ra_defrtr",
4436 .data = &ipv6_devconf.accept_ra_defrtr,
4437 .maxlen = sizeof(int),
4438 .mode = 0644,
4439 .proc_handler = proc_dointvec,
65f5c7c1 4440 },
c4fd30eb 4441 {
e21e8467
SH		 4442 .procname = "accept_ra_pinfo",
4443 .data = &ipv6_devconf.accept_ra_pinfo,
4444 .maxlen = sizeof(int),
4445 .mode = 0644,
4446 .proc_handler = proc_dointvec,
c4fd30eb 4447 },
930d6ff2
YH		 4448#ifdef CONFIG_IPV6_ROUTER_PREF
4449 {
e21e8467
SH		 4450 .procname = "accept_ra_rtr_pref",
4451 .data = &ipv6_devconf.accept_ra_rtr_pref,
4452 .maxlen = sizeof(int),
4453 .mode = 0644,
4454 .proc_handler = proc_dointvec,
930d6ff2 4455 },
52e16356 4456 {
e21e8467
SH		 4457 .procname = "router_probe_interval",
4458 .data = &ipv6_devconf.rtr_probe_interval,
4459 .maxlen = sizeof(int),
4460 .mode = 0644,
4461 .proc_handler = proc_dointvec_jiffies,
52e16356 4462 },
fa03ef38 4463#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4464 {
e21e8467
SH		 4465 .procname = "accept_ra_rt_info_max_plen",
4466 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4467 .maxlen = sizeof(int),
4468 .mode = 0644,
4469 .proc_handler = proc_dointvec,
09c884d4
YH		 4470 },
4471#endif
930d6ff2 4472#endif
fbea49e1 4473 {
e21e8467
SH		 4474 .procname = "proxy_ndp",
4475 .data = &ipv6_devconf.proxy_ndp,
4476 .maxlen = sizeof(int),
4477 .mode = 0644,
4478 .proc_handler = proc_dointvec,
fbea49e1 4479 },
0bcbc926 4480 {
e21e8467
SH		 4481 .procname = "accept_source_route",
4482 .data = &ipv6_devconf.accept_source_route,
4483 .maxlen = sizeof(int),
4484 .mode = 0644,
4485 .proc_handler = proc_dointvec,
0bcbc926 4486 },
95c385b4
NH		 4487#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4488 {
e21e8467
SH		 4489 .procname = "optimistic_dad",
4490 .data = &ipv6_devconf.optimistic_dad,
4491 .maxlen = sizeof(int),
4492 .mode = 0644,
4493 .proc_handler = proc_dointvec,
95c385b4
NH		 4494
4495 },
7bc570c8
YH		 4496#endif
4497#ifdef CONFIG_IPV6_MROUTE
4498 {
e21e8467
SH		 4499 .procname = "mc_forwarding",
4500 .data = &ipv6_devconf.mc_forwarding,
4501 .maxlen = sizeof(int),
4502 .mode = 0444,
4503 .proc_handler = proc_dointvec,
7bc570c8 4504 },
95c385b4 4505#endif
778d80be 4506 {
e21e8467
SH		 4507 .procname = "disable_ipv6",
4508 .data = &ipv6_devconf.disable_ipv6,
4509 .maxlen = sizeof(int),
4510 .mode = 0644,
4511 .proc_handler = addrconf_sysctl_disable,
778d80be 4512 },
1b34be74 4513 {
e21e8467
SH		 4514 .procname = "accept_dad",
4515 .data = &ipv6_devconf.accept_dad,
4516 .maxlen = sizeof(int),
4517 .mode = 0644,
4518 .proc_handler = proc_dointvec,
1b34be74 4519 },
f7734fdf 4520 {
f7734fdf
OP		 4521 .procname = "force_tllao",
4522 .data = &ipv6_devconf.force_tllao,
4523 .maxlen = sizeof(int),
4524 .mode = 0644,
4525 .proc_handler = proc_dointvec
4526 },
1da177e4 4527 {
f8572d8f 4528 /* sentinel */
1da177e4
LT		 4529 }
4530 },
1da177e4
LT		 4531};
4532
bff16c2f 4533static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4534 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4535{
4536 int i;
1da177e4 4537 struct addrconf_sysctl_table *t;
1da177e4 4538
1dab6222
PE		 4539#define ADDRCONF_CTL_PATH_DEV 3
4540
4541 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4542 { .procname = "net", },
4543 { .procname = "ipv6", },
4544 { .procname = "conf", },
1dab6222
PE		 4545 { /* to be set */ },
4546 { },
4547 };
4548
4549
af879cc7 4550 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4551 if (t == NULL)
f68635e6
PE		 4552 goto out;
4553
bcdd553f 4554 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4555 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4556 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4557 t->addrconf_vars[i].extra2 = net;
1da177e4 4558 }
1da177e4 4559
1ab1457c
YH		 4560 /*
4561 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4562 * by sysctl and we wouldn't want anyone to change it under our feet
4563 * (see SIOCSIFNAME).
1ab1457c 4564 */
1dab6222
PE		 4565 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4566 if (!t->dev_name)
f68635e6 4567 goto free;
1da177e4 4568
1dab6222 4569 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4570
bff16c2f 4571 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4572 t->addrconf_vars);
1da177e4
LT		 4573 if (t->sysctl_header == NULL)
4574 goto free_procname;
f68635e6
PE		 4575
4576 p->sysctl = t;
95897312 4577 return 0;
1da177e4 4578
f68635e6 4579free_procname:
1dab6222 4580 kfree(t->dev_name);
f68635e6 4581free:
1da177e4 4582 kfree(t);
f68635e6 4583out:
95897312 4584 return -ENOBUFS;
1da177e4
LT		 4585}
4586
408c4768
PE		 4587static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4588{
4589 struct addrconf_sysctl_table *t;
4590
4591 if (p->sysctl == NULL)
4592 return;
4593
4594 t = p->sysctl;
4595 p->sysctl = NULL;
ff538818 4596 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4597 kfree(t->dev_name);
4598 kfree(t);
4599}
4600
f52295a9
PE		 4601static void addrconf_sysctl_register(struct inet6_dev *idev)
4602{
54716e3b 4603 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4604 &ndisc_ifinfo_sysctl_change);
c346dca1 4605 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4606 idev, &idev->cnf);
f52295a9
PE		 4607}
4608
408c4768 4609static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4610{
408c4768
PE		 4611 __addrconf_sysctl_unregister(&idev->cnf);
4612 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4613}
4614
4615
4616#endif
4617
2c8c1e72 4618static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4619{
4620 int err;
4621 struct ipv6_devconf *all, *dflt;
4622
4623 err = -ENOMEM;
4624 all = &ipv6_devconf;
4625 dflt = &ipv6_devconf_dflt;
4626
09ad9bc7 4627 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4628 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4629 if (all == NULL)
4630 goto err_alloc_all;
4631
4632 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4633 if (dflt == NULL)
4634 goto err_alloc_dflt;
56d417b1
BH		 4635 } else {
4636 /* these will be inherited by all namespaces */
4637 dflt->autoconf = ipv6_defaults.autoconf;
4638 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4639 }
4640
4641 net->ipv6.devconf_all = all;
4642 net->ipv6.devconf_dflt = dflt;
4643
4644#ifdef CONFIG_SYSCTL
f8572d8f 4645 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4646 if (err < 0)
4647 goto err_reg_all;
4648
f8572d8f 4649 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4650 if (err < 0)
4651 goto err_reg_dflt;
4652#endif
4653 return 0;
4654
4655#ifdef CONFIG_SYSCTL
4656err_reg_dflt:
4657 __addrconf_sysctl_unregister(all);
4658err_reg_all:
4659 kfree(dflt);
4660#endif
4661err_alloc_dflt:
4662 kfree(all);
4663err_alloc_all:
4664 return err;
4665}
4666
2c8c1e72 4667static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4668{
4669#ifdef CONFIG_SYSCTL
4670 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4671 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4672#endif
09ad9bc7 4673 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4674 kfree(net->ipv6.devconf_dflt);
4675 kfree(net->ipv6.devconf_all);
4676 }
4677}
4678
4679static struct pernet_operations addrconf_ops = {
4680 .init = addrconf_init_net,
4681 .exit = addrconf_exit_net,
4682};
4683
1da177e4
LT		 4684/*
4685 * Device notifier
4686 */
4687
4688int register_inet6addr_notifier(struct notifier_block *nb)
4689{
1ab1457c 4690 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4691}
7159039a
YH		 4692EXPORT_SYMBOL(register_inet6addr_notifier);
4693
1da177e4
LT		 4694int unregister_inet6addr_notifier(struct notifier_block *nb)
4695{
e21e8467 4696 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4697}
7159039a
YH		 4698EXPORT_SYMBOL(unregister_inet6addr_notifier);
4699
b382b191
TG		 4700static struct rtnl_af_ops inet6_ops = {
4701 .family = AF_INET6,
4702 .fill_link_af = inet6_fill_link_af,
4703 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4704};
4705
1da177e4
LT		 4706/*
4707 * Init / cleanup code
4708 */
4709
4710int __init addrconf_init(void)
4711{
c2e21293 4712 int i, err;
2a8cc6c8 4713
e21e8467
SH		 4714 err = ipv6_addr_label_init();
4715 if (err < 0) {
4716 printk(KERN_CRIT "IPv6 Addrconf:"
4717 " cannot initialize default policy table: %d.\n", err);
2cc6d2bf 4718 goto out;
2a8cc6c8 4719 }
1da177e4 4720
2cc6d2bf
NH		 4721 err = register_pernet_subsys(&addrconf_ops);
4722 if (err < 0)
4723 goto out_addrlabel;
e0da5a48 4724
1da177e4
LT		 4725 /* The addrconf netdev notifier requires that loopback_dev
4726 * has it's ipv6 private information allocated and setup
4727 * before it can bring up and give link-local addresses
4728 * to other devices which are up.
4729 *
4730 * Unfortunately, loopback_dev is not necessarily the first
4731 * entry in the global dev_base list of net devices. In fact,
4732 * it is likely to be the very last entry on that list.
4733 * So this causes the notifier registry below to try and
4734 * give link-local addresses to all devices besides loopback_dev
4735 * first, then loopback_dev, which cases all the non-loopback_dev
4736 * devices to fail to get a link-local address.
4737 *
4738 * So, as a temporary fix, allocate the ipv6 structure for
4739 * loopback_dev first by hand.
4740 * Longer term, all of the dependencies ipv6 has upon the loopback
4741 * device and it being up should be removed.
4742 */
4743 rtnl_lock();
2774c7ab 4744 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4745 err = -ENOMEM;
4746 rtnl_unlock();
4747 if (err)
e0da5a48 4748 goto errlo;
1da177e4 4749
c2e21293 4750 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4751 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4752
1da177e4
LT		 4753 register_netdevice_notifier(&ipv6_dev_notf);
4754
1da177e4 4755 addrconf_verify(0);
c127ea2c 4756
b382b191
TG		 4757 err = rtnl_af_register(&inet6_ops);
4758 if (err < 0)
4759 goto errout_af;
4760
c7ac8679
GR		 4761 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4762 NULL);
c127ea2c
TG		 4763 if (err < 0)
4764 goto errout;
4765
4766 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4767 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4768 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4769 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4770 inet6_dump_ifaddr, NULL);
4771 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4772 inet6_dump_ifmcaddr, NULL);
4773 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4774 inet6_dump_ifacaddr, NULL);
c127ea2c 4775
2a8cc6c8
YH		 4776 ipv6_addr_label_rtnl_register();
4777
1da177e4 4778 return 0;
c127ea2c 4779errout:
b382b191
TG		 4780 rtnl_af_unregister(&inet6_ops);
4781errout_af:
c127ea2c 4782 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4783errlo:
4784 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4785out_addrlabel:
4786 ipv6_addr_label_cleanup();
4787out:
c127ea2c 4788 return err;
1da177e4
LT		 4789}
4790
09f7709f 4791void addrconf_cleanup(void)
1da177e4 4792{
176c39af 4793 struct net_device *dev;
1da177e4
LT		 4794 int i;
4795
4796 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4797 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4798 ipv6_addr_label_cleanup();
1da177e4
LT		 4799
4800 rtnl_lock();
4801
b382b191
TG		 4802 __rtnl_af_unregister(&inet6_ops);
4803
176c39af
DL		 4804 /* clean dev list */
4805 for_each_netdev(&init_net, dev) {
4806 if (__in6_dev_get(dev) == NULL)
4807 continue;
4808 addrconf_ifdown(dev, 1);
4809 }
4810 addrconf_ifdown(init_net.loopback_dev, 2);
4811
1da177e4
LT		 4812 /*
4813 * Check hash table.
4814 */
5c578aed 4815 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4816 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4817 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4818 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4819
4820 del_timer(&addr_chk_timer);
1da177e4 4821 rtnl_unlock();
1da177e4 4822}
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