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ipv6: Fix sysctl unregistration deadlock
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
43#include <linux/socket.h>
44#include <linux/sockios.h>
1da177e4
LT		 45#include <linux/net.h>
46#include <linux/in6.h>
47#include <linux/netdevice.h>
1823730f 48#include <linux/if_addr.h>
1da177e4
LT		 49#include <linux/if_arp.h>
50#include <linux/if_arcnet.h>
51#include <linux/if_infiniband.h>
52#include <linux/route.h>
53#include <linux/inetdevice.h>
54#include <linux/init.h>
55#ifdef CONFIG_SYSCTL
56#include <linux/sysctl.h>
57#endif
4fc268d2 58#include <linux/capability.h>
1da177e4
LT		 59#include <linux/delay.h>
60#include <linux/notifier.h>
543537bd 61#include <linux/string.h>
1da177e4 62
457c4cbc 63#include <net/net_namespace.h>
1da177e4
LT		 64#include <net/sock.h>
65#include <net/snmp.h>
66
67#include <net/ipv6.h>
68#include <net/protocol.h>
69#include <net/ndisc.h>
70#include <net/ip6_route.h>
71#include <net/addrconf.h>
72#include <net/tcp.h>
73#include <net/ip.h>
5d620266 74#include <net/netlink.h>
f24e3d65 75#include <net/pkt_sched.h>
1da177e4
LT		 76#include <linux/if_tunnel.h>
77#include <linux/rtnetlink.h>
78
79#ifdef CONFIG_IPV6_PRIVACY
80#include <linux/random.h>
1da177e4
LT		 81#endif
82
83#include <asm/uaccess.h>
7f7d9a6b 84#include <asm/unaligned.h>
1da177e4
LT		 85
86#include <linux/proc_fs.h>
87#include <linux/seq_file.h>
88
89/* Set to 3 to get tracing... */
90#define ACONF_DEBUG 2
91
92#if ACONF_DEBUG >= 3
93#define ADBG(x) printk x
94#else
95#define ADBG(x)
96#endif
97
98#define INFINITY_LIFE_TIME 0xFFFFFFFF
99#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
100
101#ifdef CONFIG_SYSCTL
f52295a9 102static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 103static void addrconf_sysctl_unregister(struct inet6_dev *idev);
104#else
105static inline void addrconf_sysctl_register(struct inet6_dev *idev)
106{
107}
108
109static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
110{
111}
1da177e4
LT		 112#endif
113
114#ifdef CONFIG_IPV6_PRIVACY
115static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 116static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 117static void ipv6_regen_rndid(unsigned long data);
118
119static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 120#endif
121
1b34be74 122static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 123static int ipv6_count_addresses(struct inet6_dev *idev);
124
125/*
126 * Configured unicast address hash table
127 */
128static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
129static DEFINE_RWLOCK(addrconf_hash_lock);
130
1da177e4
LT		 131static void addrconf_verify(unsigned long);
132
8d06afab 133static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 134static DEFINE_SPINLOCK(addrconf_verify_lock);
135
136static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
137static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138
139static int addrconf_ifdown(struct net_device *dev, int how);
140
e431b8c0 141static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 142static void addrconf_dad_timer(unsigned long data);
143static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 144static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 145static void addrconf_rs_timer(unsigned long data);
146static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
147static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148
1ab1457c 149static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 150 struct prefix_info *pinfo);
06bfe655
DL		 151static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
152 struct net_device *dev);
1da177e4 153
e041c683 154static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 155
888c848e 156static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 157 .forwarding = 0,
158 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
159 .mtu6 = IPV6_MIN_MTU,
160 .accept_ra = 1,
161 .accept_redirects = 1,
162 .autoconf = 1,
163 .force_mld_version = 0,
164 .dad_transmits = 1,
165 .rtr_solicits = MAX_RTR_SOLICITATIONS,
166 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
167 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
168#ifdef CONFIG_IPV6_PRIVACY
169 .use_tempaddr = 0,
170 .temp_valid_lft = TEMP_VALID_LIFETIME,
171 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
172 .regen_max_retry = REGEN_MAX_RETRY,
173 .max_desync_factor = MAX_DESYNC_FACTOR,
174#endif
175 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 176 .accept_ra_defrtr = 1,
c4fd30eb 177 .accept_ra_pinfo = 1,
930d6ff2
YH		 178#ifdef CONFIG_IPV6_ROUTER_PREF
179 .accept_ra_rtr_pref = 1,
52e16356 180 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 181#ifdef CONFIG_IPV6_ROUTE_INFO
182 .accept_ra_rt_info_max_plen = 0,
183#endif
930d6ff2 184#endif
fbea49e1 185 .proxy_ndp = 0,
0bcbc926 186 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 187 .disable_ipv6 = 0,
1b34be74 188 .accept_dad = 1,
1da177e4
LT		 189};
190
ab32ea5d 191static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 192 .forwarding = 0,
193 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
194 .mtu6 = IPV6_MIN_MTU,
195 .accept_ra = 1,
196 .accept_redirects = 1,
197 .autoconf = 1,
198 .dad_transmits = 1,
199 .rtr_solicits = MAX_RTR_SOLICITATIONS,
200 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202#ifdef CONFIG_IPV6_PRIVACY
203 .use_tempaddr = 0,
204 .temp_valid_lft = TEMP_VALID_LIFETIME,
205 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
206 .regen_max_retry = REGEN_MAX_RETRY,
207 .max_desync_factor = MAX_DESYNC_FACTOR,
208#endif
209 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 210 .accept_ra_defrtr = 1,
c4fd30eb 211 .accept_ra_pinfo = 1,
930d6ff2
YH		 212#ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
52e16356 214 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 215#ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_max_plen = 0,
217#endif
930d6ff2 218#endif
fbea49e1 219 .proxy_ndp = 0,
0bcbc926 220 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 221 .disable_ipv6 = 0,
1b34be74 222 .accept_dad = 1,
1da177e4
LT		 223};
224
225/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 226const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 227const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 228const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
229const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 230
f24e3d65 231/* Check if a valid qdisc is available */
05297949 232static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 233{
05297949 234 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 235}
236
2b5ead46
YH		 237/* Check if a route is valid prefix route */
238static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
239{
240 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
241}
242
1da177e4
LT		 243static void addrconf_del_timer(struct inet6_ifaddr *ifp)
244{
245 if (del_timer(&ifp->timer))
246 __in6_ifa_put(ifp);
247}
248
249enum addrconf_timer_t
250{
251 AC_NONE,
252 AC_DAD,
253 AC_RS,
254};
255
256static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
257 enum addrconf_timer_t what,
258 unsigned long when)
259{
260 if (!del_timer(&ifp->timer))
261 in6_ifa_hold(ifp);
262
263 switch (what) {
264 case AC_DAD:
265 ifp->timer.function = addrconf_dad_timer;
266 break;
267 case AC_RS:
268 ifp->timer.function = addrconf_rs_timer;
269 break;
270 default:;
271 }
272 ifp->timer.expires = jiffies + when;
273 add_timer(&ifp->timer);
274}
275
7f7d9a6b
HX		 276static int snmp6_alloc_dev(struct inet6_dev *idev)
277{
7f7d9a6b 278 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 279 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 280 goto err_ip;
281 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 282 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 283 goto err_icmp;
14878f75 284 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 285 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 286 goto err_icmpmsg;
7f7d9a6b
HX		 287
288 return 0;
289
14878f75
DS		 290err_icmpmsg:
291 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 292err_icmp:
293 snmp_mib_free((void **)idev->stats.ipv6);
294err_ip:
aaf70ec7 295 return -ENOMEM;
7f7d9a6b
HX		 296}
297
16910b98 298static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 299{
14878f75 300 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 301 snmp_mib_free((void **)idev->stats.icmpv6);
302 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 303}
304
1da177e4
LT		 305/* Nobody refers to this device, we may destroy it. */
306
8814c4b5
YH		 307static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
308{
309 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
310 kfree(idev);
311}
312
1da177e4
LT		 313void in6_dev_finish_destroy(struct inet6_dev *idev)
314{
315 struct net_device *dev = idev->dev;
547b792c
IJ		 316
317 WARN_ON(idev->addr_list != NULL);
318 WARN_ON(idev->mc_list != NULL);
319
1da177e4
LT		 320#ifdef NET_REFCNT_DEBUG
321 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
322#endif
323 dev_put(dev);
324 if (!idev->dead) {
325 printk("Freeing alive inet6 device %p\n", idev);
326 return;
327 }
328 snmp6_free_dev(idev);
8814c4b5 329 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 330}
331
7159039a
YH		 332EXPORT_SYMBOL(in6_dev_finish_destroy);
333
1da177e4
LT		 334static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
335{
336 struct inet6_dev *ndev;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return NULL;
342
1ab1457c 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 344
1ab1457c
YH		 345 if (ndev == NULL)
346 return NULL;
322f74a4
IO		 347
348 rwlock_init(&ndev->lock);
349 ndev->dev = dev;
c346dca1 350 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 351 ndev->cnf.mtu6 = dev->mtu;
352 ndev->cnf.sysctl = NULL;
353 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
354 if (ndev->nd_parms == NULL) {
355 kfree(ndev);
356 return NULL;
357 }
0187bdfb
BH		 358 if (ndev->cnf.forwarding)
359 dev_disable_lro(dev);
322f74a4
IO		 360 /* We refer to the device */
361 dev_hold(dev);
1da177e4 362
322f74a4
IO		 363 if (snmp6_alloc_dev(ndev) < 0) {
364 ADBG((KERN_WARNING
365 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 366 __func__, dev->name));
322f74a4
IO		 367 neigh_parms_release(&nd_tbl, ndev->nd_parms);
368 ndev->dead = 1;
369 in6_dev_finish_destroy(ndev);
370 return NULL;
371 }
1da177e4 372
322f74a4
IO		 373 if (snmp6_register_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
382
383 /* One reference from device. We must do this before
384 * we invoke __ipv6_regen_rndid().
385 */
386 in6_dev_hold(ndev);
1da177e4 387
1b34be74
YH		 388 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
389 ndev->cnf.accept_dad = -1;
390
b077d7ab
YH		 391#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
392 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
393 printk(KERN_INFO
394 "%s: Disabled Multicast RS\n",
395 dev->name);
396 ndev->cnf.rtr_solicits = 0;
397 }
398#endif
399
1da177e4 400#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 401 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 402 if ((dev->flags&IFF_LOOPBACK) ||
403 dev->type == ARPHRD_TUNNEL ||
9625ed72 404 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 405 dev->type == ARPHRD_SIT ||
0be669bb 406 dev->type == ARPHRD_NONE) {
322f74a4
IO		 407 printk(KERN_INFO
408 "%s: Disabled Privacy Extensions\n",
409 dev->name);
410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
1da177e4
LT		 415#endif
416
f24e3d65 417 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 418 ndev->if_flags |= IF_READY;
419
322f74a4
IO		 420 ipv6_mc_init_dev(ndev);
421 ndev->tstamp = jiffies;
f52295a9 422 addrconf_sysctl_register(ndev);
30c4cf57
DS		 423 /* protected by rtnl_lock */
424 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 425
426 /* Join all-node multicast group */
f3ee4010 427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 428
1da177e4
LT		 429 return ndev;
430}
431
cee89473 432static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 433{
434 struct inet6_dev *idev;
435
436 ASSERT_RTNL();
437
438 if ((idev = __in6_dev_get(dev)) == NULL) {
439 if ((idev = ipv6_add_dev(dev)) == NULL)
440 return NULL;
441 }
c5e33bdd 442
1da177e4
LT		 443 if (dev->flags&IFF_UP)
444 ipv6_mc_up(idev);
445 return idev;
446}
447
448#ifdef CONFIG_SYSCTL
449static void dev_forward_change(struct inet6_dev *idev)
450{
451 struct net_device *dev;
452 struct inet6_ifaddr *ifa;
1da177e4
LT		 453
454 if (!idev)
455 return;
456 dev = idev->dev;
0187bdfb
BH		 457 if (idev->cnf.forwarding)
458 dev_disable_lro(dev);
1da177e4 459 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 460 if (idev->cnf.forwarding)
f3ee4010 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 462 else
f3ee4010 463 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 464 }
465 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 466 if (ifa->flags&IFA_F_TENTATIVE)
467 continue;
1da177e4
LT		 468 if (idev->cnf.forwarding)
469 addrconf_join_anycast(ifa);
470 else
471 addrconf_leave_anycast(ifa);
472 }
473}
474
475
e186932b 476static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 477{
478 struct net_device *dev;
479 struct inet6_dev *idev;
480
481 read_lock(&dev_base_lock);
bff16c2f 482 for_each_netdev(net, dev) {
8814c4b5 483 rcu_read_lock();
1da177e4
LT		 484 idev = __in6_dev_get(dev);
485 if (idev) {
e186932b
PE		 486 int changed = (!idev->cnf.forwarding) ^ (!newf);
487 idev->cnf.forwarding = newf;
1da177e4
LT		 488 if (changed)
489 dev_forward_change(idev);
490 }
8814c4b5 491 rcu_read_unlock();
1da177e4
LT		 492 }
493 read_unlock(&dev_base_lock);
494}
c8fecf22 495
b325fddb 496static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 497{
bff16c2f
PE		 498 struct net *net;
499
500 net = (struct net *)table->extra2;
441fc2a2 501 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 502 return 0;
503
504 if (!rtnl_trylock())
505 return -ERESTARTSYS;
c8fecf22 506
e186932b
PE		 507 if (p == &net->ipv6.devconf_all->forwarding) {
508 __s32 newf = net->ipv6.devconf_all->forwarding;
509 net->ipv6.devconf_dflt->forwarding = newf;
510 addrconf_forward_change(net, newf);
c8fecf22
PE		 511 } else if ((!*p) ^ (!old))
512 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 513 rtnl_unlock();
c8fecf22
PE		 514
515 if (*p)
7b4da532 516 rt6_purge_dflt_routers(net);
b325fddb 517 return 1;
c8fecf22 518}
1da177e4
LT		 519#endif
520
521/* Nobody refers to this ifaddr, destroy it */
522
523void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
524{
547b792c
IJ		 525 WARN_ON(ifp->if_next != NULL);
526 WARN_ON(ifp->lst_next != NULL);
527
1da177e4
LT		 528#ifdef NET_REFCNT_DEBUG
529 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
530#endif
531
532 in6_dev_put(ifp->idev);
533
534 if (del_timer(&ifp->timer))
535 printk("Timer is still running, when freeing ifa=%p\n", ifp);
536
537 if (!ifp->dead) {
538 printk("Freeing alive inet6 address %p\n", ifp);
539 return;
540 }
541 dst_release(&ifp->rt->u.dst);
542
543 kfree(ifp);
544}
545
e55ffac6
BH		 546static void
547ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
548{
549 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 550 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 551
552 /*
553 * Each device address list is sorted in order of scope -
554 * global before linklocal.
555 */
556 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
557 ifap = &ifa->if_next) {
8a6ce0c0 558 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 559 break;
560 }
561
562 ifp->if_next = *ifap;
563 *ifap = ifp;
564}
565
3eb84f49
YH		 566/*
567 * Hash function taken from net_alias.c
568 */
569static u8 ipv6_addr_hash(const struct in6_addr *addr)
570{
571 __u32 word;
572
573 /*
574 * We perform the hash function over the last 64 bits of the address
575 * This will include the IEEE address token on links that support it.
576 */
577
578 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
579 word ^= (word >> 16);
580 word ^= (word >> 8);
581
582 return ((word ^ (word >> 4)) & 0x0f);
583}
584
1da177e4
LT		 585/* On success it returns ifp with increased reference count */
586
587static struct inet6_ifaddr *
588ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 589 int scope, u32 flags)
1da177e4
LT		 590{
591 struct inet6_ifaddr *ifa = NULL;
592 struct rt6_info *rt;
593 int hash;
594 int err = 0;
d68b8270
YH		 595 int addr_type = ipv6_addr_type(addr);
596
597 if (addr_type == IPV6_ADDR_ANY ||
598 addr_type & IPV6_ADDR_MULTICAST ||
599 (!(idev->dev->flags & IFF_LOOPBACK) &&
600 addr_type & IPV6_ADDR_LOOPBACK))
601 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 602
8814c4b5 603 rcu_read_lock_bh();
1da177e4
LT		 604 if (idev->dead) {
605 err = -ENODEV; /*XXX*/
606 goto out2;
607 }
608
609 write_lock(&addrconf_hash_lock);
610
611 /* Ignore adding duplicate addresses on an interface */
c346dca1 612 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 613 ADBG(("ipv6_add_addr: already assigned\n"));
614 err = -EEXIST;
615 goto out;
616 }
617
322f74a4 618 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 619
620 if (ifa == NULL) {
621 ADBG(("ipv6_add_addr: malloc failed\n"));
622 err = -ENOBUFS;
623 goto out;
624 }
625
626 rt = addrconf_dst_alloc(idev, addr, 0);
627 if (IS_ERR(rt)) {
628 err = PTR_ERR(rt);
629 goto out;
630 }
631
1da177e4
LT		 632 ipv6_addr_copy(&ifa->addr, addr);
633
634 spin_lock_init(&ifa->lock);
635 init_timer(&ifa->timer);
636 ifa->timer.data = (unsigned long) ifa;
637 ifa->scope = scope;
638 ifa->prefix_len = pfxlen;
639 ifa->flags = flags | IFA_F_TENTATIVE;
640 ifa->cstamp = ifa->tstamp = jiffies;
641
57f5f544
KF		 642 ifa->rt = rt;
643
95c385b4
NH		 644 /*
645 * part one of RFC 4429, section 3.3
646 * We should not configure an address as
647 * optimistic if we do not yet know the link
648 * layer address of our nexhop router
649 */
650
651 if (rt->rt6i_nexthop == NULL)
652 ifa->flags &= ~IFA_F_OPTIMISTIC;
653
1da177e4
LT		 654 ifa->idev = idev;
655 in6_dev_hold(idev);
656 /* For caller */
657 in6_ifa_hold(ifa);
658
659 /* Add to big hash table */
660 hash = ipv6_addr_hash(addr);
661
662 ifa->lst_next = inet6_addr_lst[hash];
663 inet6_addr_lst[hash] = ifa;
664 in6_ifa_hold(ifa);
665 write_unlock(&addrconf_hash_lock);
666
667 write_lock(&idev->lock);
668 /* Add to inet6_dev unicast addr list. */
e55ffac6 669 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 670
671#ifdef CONFIG_IPV6_PRIVACY
672 if (ifa->flags&IFA_F_TEMPORARY) {
673 ifa->tmp_next = idev->tempaddr_list;
674 idev->tempaddr_list = ifa;
675 in6_ifa_hold(ifa);
676 }
677#endif
678
1da177e4
LT		 679 in6_ifa_hold(ifa);
680 write_unlock(&idev->lock);
681out2:
8814c4b5 682 rcu_read_unlock_bh();
1da177e4 683
fd92833a 684 if (likely(err == 0))
e041c683 685 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 686 else {
687 kfree(ifa);
688 ifa = ERR_PTR(err);
689 }
690
691 return ifa;
692out:
693 write_unlock(&addrconf_hash_lock);
694 goto out2;
695}
696
697/* This function wants to get referenced ifp and releases it before return */
698
699static void ipv6_del_addr(struct inet6_ifaddr *ifp)
700{
701 struct inet6_ifaddr *ifa, **ifap;
702 struct inet6_dev *idev = ifp->idev;
703 int hash;
704 int deleted = 0, onlink = 0;
705 unsigned long expires = jiffies;
706
707 hash = ipv6_addr_hash(&ifp->addr);
708
709 ifp->dead = 1;
710
711 write_lock_bh(&addrconf_hash_lock);
712 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
713 ifap = &ifa->lst_next) {
714 if (ifa == ifp) {
715 *ifap = ifa->lst_next;
716 __in6_ifa_put(ifp);
717 ifa->lst_next = NULL;
718 break;
719 }
720 }
721 write_unlock_bh(&addrconf_hash_lock);
722
723 write_lock_bh(&idev->lock);
724#ifdef CONFIG_IPV6_PRIVACY
725 if (ifp->flags&IFA_F_TEMPORARY) {
726 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
727 ifap = &ifa->tmp_next) {
728 if (ifa == ifp) {
729 *ifap = ifa->tmp_next;
730 if (ifp->ifpub) {
731 in6_ifa_put(ifp->ifpub);
732 ifp->ifpub = NULL;
733 }
734 __in6_ifa_put(ifp);
735 ifa->tmp_next = NULL;
736 break;
737 }
738 }
739 }
740#endif
741
1d142804 742 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 743 if (ifa == ifp) {
744 *ifap = ifa->if_next;
745 __in6_ifa_put(ifp);
746 ifa->if_next = NULL;
747 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
748 break;
749 deleted = 1;
1d142804 750 continue;
1da177e4
LT		 751 } else if (ifp->flags & IFA_F_PERMANENT) {
752 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
753 ifp->prefix_len)) {
754 if (ifa->flags & IFA_F_PERMANENT) {
755 onlink = 1;
756 if (deleted)
757 break;
758 } else {
759 unsigned long lifetime;
760
761 if (!onlink)
762 onlink = -1;
763
764 spin_lock(&ifa->lock);
4bed72e4
YH		 765
766 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
767 /*
768 * Note: Because this address is
769 * not permanent, lifetime <
770 * LONG_MAX / HZ here.
771 */
1da177e4
LT		 772 if (time_before(expires,
773 ifa->tstamp + lifetime * HZ))
774 expires = ifa->tstamp + lifetime * HZ;
775 spin_unlock(&ifa->lock);
776 }
777 }
778 }
1d142804 779 ifap = &ifa->if_next;
1da177e4
LT		 780 }
781 write_unlock_bh(&idev->lock);
782
b2238566
AV		 783 addrconf_del_timer(ifp);
784
1da177e4
LT		 785 ipv6_ifa_notify(RTM_DELADDR, ifp);
786
e041c683 787 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 788
1da177e4
LT		 789 /*
790 * Purge or update corresponding prefix
791 *
792 * 1) we don't purge prefix here if address was not permanent.
793 * prefix is managed by its own lifetime.
794 * 2) if there're no addresses, delete prefix.
795 * 3) if there're still other permanent address(es),
796 * corresponding prefix is still permanent.
797 * 4) otherwise, update prefix lifetime to the
798 * longest valid lifetime among the corresponding
799 * addresses on the device.
800 * Note: subsequent RA will update lifetime.
801 *
802 * --yoshfuji
803 */
804 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
805 struct in6_addr prefix;
806 struct rt6_info *rt;
c346dca1 807 struct net *net = dev_net(ifp->idev->dev);
1da177e4 808 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 809 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 810
2b5ead46 811 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 812 if (onlink == 0) {
e0a1ad73 813 ip6_del_rt(rt);
1da177e4
LT		 814 rt = NULL;
815 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
816 rt->rt6i_expires = expires;
817 rt->rt6i_flags |= RTF_EXPIRES;
818 }
819 }
820 dst_release(&rt->u.dst);
821 }
822
823 in6_ifa_put(ifp);
824}
825
826#ifdef CONFIG_IPV6_PRIVACY
827static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
828{
829 struct inet6_dev *idev = ifp->idev;
830 struct in6_addr addr, *tmpaddr;
831 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 832 unsigned long regen_advance;
1da177e4
LT		 833 int tmp_plen;
834 int ret = 0;
835 int max_addresses;
95c385b4 836 u32 addr_flags;
1da177e4
LT		 837
838 write_lock(&idev->lock);
839 if (ift) {
840 spin_lock_bh(&ift->lock);
841 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
842 spin_unlock_bh(&ift->lock);
843 tmpaddr = &addr;
844 } else {
845 tmpaddr = NULL;
846 }
847retry:
848 in6_dev_hold(idev);
849 if (idev->cnf.use_tempaddr <= 0) {
850 write_unlock(&idev->lock);
851 printk(KERN_INFO
852 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
853 in6_dev_put(idev);
854 ret = -1;
855 goto out;
856 }
857 spin_lock_bh(&ifp->lock);
858 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
859 idev->cnf.use_tempaddr = -1; /*XXX*/
860 spin_unlock_bh(&ifp->lock);
861 write_unlock(&idev->lock);
862 printk(KERN_WARNING
863 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
864 in6_dev_put(idev);
865 ret = -1;
866 goto out;
867 }
868 in6_ifa_hold(ifp);
869 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
870 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
871 spin_unlock_bh(&ifp->lock);
872 write_unlock(&idev->lock);
873 printk(KERN_WARNING
874 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
875 in6_ifa_put(ifp);
876 in6_dev_put(idev);
877 ret = -1;
878 goto out;
879 }
880 memcpy(&addr.s6_addr[8], idev->rndid, 8);
881 tmp_valid_lft = min_t(__u32,
882 ifp->valid_lft,
883 idev->cnf.temp_valid_lft);
1ab1457c
YH		 884 tmp_prefered_lft = min_t(__u32,
885 ifp->prefered_lft,
1da177e4
LT		 886 idev->cnf.temp_prefered_lft - desync_factor / HZ);
887 tmp_plen = ifp->prefix_len;
888 max_addresses = idev->cnf.max_addresses;
889 tmp_cstamp = ifp->cstamp;
890 tmp_tstamp = ifp->tstamp;
891 spin_unlock_bh(&ifp->lock);
892
eac55bf9
BB		 893 regen_advance = idev->cnf.regen_max_retry *
894 idev->cnf.dad_transmits *
895 idev->nd_parms->retrans_time / HZ;
1da177e4 896 write_unlock(&idev->lock);
95c385b4 897
eac55bf9
BB		 898 /* A temporary address is created only if this calculated Preferred
899 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
900 * an implementation must not create a temporary address with a zero
901 * Preferred Lifetime.
902 */
903 if (tmp_prefered_lft <= regen_advance) {
904 in6_ifa_put(ifp);
905 in6_dev_put(idev);
906 ret = -1;
907 goto out;
908 }
909
95c385b4
NH		 910 addr_flags = IFA_F_TEMPORARY;
911 /* set in addrconf_prefix_rcv() */
912 if (ifp->flags & IFA_F_OPTIMISTIC)
913 addr_flags |= IFA_F_OPTIMISTIC;
914
1da177e4 915 ift = !max_addresses ||
1ab1457c 916 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 917 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 918 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
919 addr_flags) : NULL;
1da177e4
LT		 920 if (!ift || IS_ERR(ift)) {
921 in6_ifa_put(ifp);
922 in6_dev_put(idev);
923 printk(KERN_INFO
924 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
925 tmpaddr = &addr;
926 write_lock(&idev->lock);
927 goto retry;
928 }
929
930 spin_lock_bh(&ift->lock);
931 ift->ifpub = ifp;
932 ift->valid_lft = tmp_valid_lft;
933 ift->prefered_lft = tmp_prefered_lft;
934 ift->cstamp = tmp_cstamp;
935 ift->tstamp = tmp_tstamp;
936 spin_unlock_bh(&ift->lock);
937
938 addrconf_dad_start(ift, 0);
939 in6_ifa_put(ift);
940 in6_dev_put(idev);
941out:
942 return ret;
943}
944#endif
945
946/*
072047e4 947 * Choose an appropriate source address (RFC3484)
1da177e4 948 */
a9b05723
YH		 949enum {
950 IPV6_SADDR_RULE_INIT = 0,
951 IPV6_SADDR_RULE_LOCAL,
952 IPV6_SADDR_RULE_SCOPE,
953 IPV6_SADDR_RULE_PREFERRED,
954#ifdef CONFIG_IPV6_MIP6
955 IPV6_SADDR_RULE_HOA,
956#endif
957 IPV6_SADDR_RULE_OIF,
958 IPV6_SADDR_RULE_LABEL,
959#ifdef CONFIG_IPV6_PRIVACY
960 IPV6_SADDR_RULE_PRIVACY,
961#endif
962 IPV6_SADDR_RULE_ORCHID,
963 IPV6_SADDR_RULE_PREFIX,
964 IPV6_SADDR_RULE_MAX
965};
966
072047e4 967struct ipv6_saddr_score {
a9b05723
YH		 968 int rule;
969 int addr_type;
970 struct inet6_ifaddr *ifa;
971 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
972 int scopedist;
973 int matchlen;
072047e4
YH		 974};
975
a9b05723 976struct ipv6_saddr_dst {
9acd9f3a 977 const struct in6_addr *addr;
a9b05723
YH		 978 int ifindex;
979 int scope;
980 int label;
7cbca67c 981 unsigned int prefs;
a9b05723 982};
072047e4 983
b6f99a21 984static inline int ipv6_saddr_preferred(int type)
1da177e4 985{
072047e4
YH		 986 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
987 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
988 return 1;
989 return 0;
1da177e4
LT		 990}
991
3de23255
BT		 992static int ipv6_get_saddr_eval(struct net *net,
993 struct ipv6_saddr_score *score,
a9b05723
YH		 994 struct ipv6_saddr_dst *dst,
995 int i)
996{
997 int ret;
998
999 if (i <= score->rule) {
1000 switch (i) {
1001 case IPV6_SADDR_RULE_SCOPE:
1002 ret = score->scopedist;
1003 break;
1004 case IPV6_SADDR_RULE_PREFIX:
1005 ret = score->matchlen;
1006 break;
1007 default:
1008 ret = !!test_bit(i, score->scorebits);
1009 }
1010 goto out;
1011 }
1012
1013 switch (i) {
1014 case IPV6_SADDR_RULE_INIT:
1015 /* Rule 0: remember if hiscore is not ready yet */
1016 ret = !!score->ifa;
1017 break;
1018 case IPV6_SADDR_RULE_LOCAL:
1019 /* Rule 1: Prefer same address */
1020 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1021 break;
1022 case IPV6_SADDR_RULE_SCOPE:
1023 /* Rule 2: Prefer appropriate scope
1024 *
1025 * ret
1026 * ^
1027 * -1 | d 15
1028 * ---+--+-+---> scope
1029 * |
1030 * | d is scope of the destination.
1031 * B-d | \
1032 * | \ <- smaller scope is better if
1033 * B-15 | \ if scope is enough for destinaion.
1034 * | ret = B - scope (-1 <= scope >= d <= 15).
1035 * d-C-1 | /
1036 * |/ <- greater is better
1037 * -C / if scope is not enough for destination.
1038 * /| ret = scope - C (-1 <= d < scope <= 15).
1039 *
1040 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1041 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1042 * Assume B = 0 and we get C > 29.
1043 */
1044 ret = __ipv6_addr_src_scope(score->addr_type);
1045 if (ret >= dst->scope)
1046 ret = -ret;
1047 else
1048 ret -= 128; /* 30 is enough */
1049 score->scopedist = ret;
1050 break;
1051 case IPV6_SADDR_RULE_PREFERRED:
1052 /* Rule 3: Avoid deprecated and optimistic addresses */
1053 ret = ipv6_saddr_preferred(score->addr_type) ||
1054 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1055 break;
1056#ifdef CONFIG_IPV6_MIP6
1057 case IPV6_SADDR_RULE_HOA:
7cbca67c 1058 {
a9b05723 1059 /* Rule 4: Prefer home address */
7cbca67c
YH		 1060 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1061 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1062 break;
7cbca67c 1063 }
a9b05723
YH		 1064#endif
1065 case IPV6_SADDR_RULE_OIF:
1066 /* Rule 5: Prefer outgoing interface */
1067 ret = (!dst->ifindex ||
1068 dst->ifindex == score->ifa->idev->dev->ifindex);
1069 break;
1070 case IPV6_SADDR_RULE_LABEL:
1071 /* Rule 6: Prefer matching label */
3de23255
BT		 1072 ret = ipv6_addr_label(net,
1073 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1074 score->ifa->idev->dev->ifindex) == dst->label;
1075 break;
1076#ifdef CONFIG_IPV6_PRIVACY
1077 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1078 {
a9b05723
YH		 1079 /* Rule 7: Prefer public address
1080 * Note: prefer temprary address if use_tempaddr >= 2
1081 */
7cbca67c
YH		 1082 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1083 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1084 score->ifa->idev->cnf.use_tempaddr >= 2;
1085 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1086 break;
7cbca67c 1087 }
a9b05723
YH		 1088#endif
1089 case IPV6_SADDR_RULE_ORCHID:
1090 /* Rule 8-: Prefer ORCHID vs ORCHID or
1091 * non-ORCHID vs non-ORCHID
1092 */
1093 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1094 ipv6_addr_orchid(dst->addr));
1095 break;
1096 case IPV6_SADDR_RULE_PREFIX:
1097 /* Rule 8: Use longest matching prefix */
1098 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1099 dst->addr);
1100 break;
1101 default:
1102 ret = 0;
1103 }
1104
1105 if (ret)
1106 __set_bit(i, score->scorebits);
1107 score->rule = i;
1108out:
1109 return ret;
1110}
1111
191cd582 1112int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1113 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1114 struct in6_addr *saddr)
1da177e4 1115{
a9b05723
YH		 1116 struct ipv6_saddr_score scores[2],
1117 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1118 struct ipv6_saddr_dst dst;
072047e4 1119 struct net_device *dev;
a9b05723 1120 int dst_type;
1da177e4 1121
a9b05723
YH		 1122 dst_type = __ipv6_addr_type(daddr);
1123 dst.addr = daddr;
1124 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1125 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1126 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1127 dst.prefs = prefs;
a9b05723
YH		 1128
1129 hiscore->rule = -1;
1130 hiscore->ifa = NULL;
1da177e4 1131
072047e4 1132 read_lock(&dev_base_lock);
8814c4b5 1133 rcu_read_lock();
1da177e4 1134
6fda7350 1135 for_each_netdev(net, dev) {
072047e4 1136 struct inet6_dev *idev;
072047e4 1137
a9b05723 1138 /* Candidate Source Address (section 4)
072047e4
YH		 1139 * - multicast and link-local destination address,
1140 * the set of candidate source address MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same link as the outgoing
1143 * interface.
1144 * (- For site-local destination addresses, the
1145 * set of candidate source addresses MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same site as the outgoing
1148 * interface.)
1149 */
a9b05723
YH		 1150 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1151 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1152 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1153 continue;
1da177e4 1154
1da177e4 1155 idev = __in6_dev_get(dev);
072047e4
YH		 1156 if (!idev)
1157 continue;
1158
1159 read_lock_bh(&idev->lock);
a9b05723
YH		 1160 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1161 int i;
072047e4 1162
a9b05723 1163 /*
6b3ae80a
YH		 1164 * - Tentative Address (RFC2462 section 5.4)
1165 * - A tentative address is not considered
1166 * "assigned to an interface" in the traditional
95c385b4 1167 * sense, unless it is also flagged as optimistic.
6b3ae80a 1168 * - Candidate Source Address (section 4)
072047e4
YH		 1169 * - In any case, anycast addresses, multicast
1170 * addresses, and the unspecified address MUST
1171 * NOT be included in a candidate set.
1172 */
a9b05723
YH		 1173 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1174 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1175 continue;
a9b05723
YH		 1176
1177 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1178
1179 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1180 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1181 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1182 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1183 "assigned as unicast address on %s",
1184 dev->name);
1185 continue;
1186 }
1187
a9b05723
YH		 1188 score->rule = -1;
1189 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1190
1191 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1192 int minihiscore, miniscore;
1193
3de23255
BT		 1194 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1195 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1196
1197 if (minihiscore > miniscore) {
1198 if (i == IPV6_SADDR_RULE_SCOPE &&
1199 score->scopedist > 0) {
1200 /*
1201 * special case:
1202 * each remaining entry
1203 * has too small (not enough)
1204 * scope, because ifa entries
1205 * are sorted by their scope
1206 * values.
1207 */
1208 goto try_nextdev;
1209 }
1210 break;
1211 } else if (minihiscore < miniscore) {
1212 struct ipv6_saddr_score *tmp;
1213
1214 if (hiscore->ifa)
1215 in6_ifa_put(hiscore->ifa);
1216
1217 in6_ifa_hold(score->ifa);
1218
1219 tmp = hiscore;
1220 hiscore = score;
1221 score = tmp;
1222
1223 /* restore our iterator */
1224 score->ifa = hiscore->ifa;
1225
1226 break;
1da177e4 1227 }
072047e4 1228 }
1da177e4 1229 }
a9b05723 1230try_nextdev:
072047e4 1231 read_unlock_bh(&idev->lock);
1da177e4 1232 }
8814c4b5 1233 rcu_read_unlock();
1da177e4
LT		 1234 read_unlock(&dev_base_lock);
1235
a9b05723 1236 if (!hiscore->ifa)
072047e4 1237 return -EADDRNOTAVAIL;
1ab1457c 1238
a9b05723
YH		 1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1240 in6_ifa_put(hiscore->ifa);
072047e4 1241 return 0;
1da177e4
LT		 1242}
1243
5e5f3f0f 1244EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1245
95c385b4
NH		 1246int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1247 unsigned char banned_flags)
1da177e4
LT		 1248{
1249 struct inet6_dev *idev;
1250 int err = -EADDRNOTAVAIL;
1251
8814c4b5 1252 rcu_read_lock();
1da177e4
LT		 1253 if ((idev = __in6_dev_get(dev)) != NULL) {
1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
1257 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1258 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1259 ipv6_addr_copy(addr, &ifp->addr);
1260 err = 0;
1261 break;
1262 }
1263 }
1264 read_unlock_bh(&idev->lock);
1265 }
8814c4b5 1266 rcu_read_unlock();
1da177e4
LT		 1267 return err;
1268}
1269
1270static int ipv6_count_addresses(struct inet6_dev *idev)
1271{
1272 int cnt = 0;
1273 struct inet6_ifaddr *ifp;
1274
1275 read_lock_bh(&idev->lock);
1276 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1277 cnt++;
1278 read_unlock_bh(&idev->lock);
1279 return cnt;
1280}
1281
bfeade08
DL		 1282int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1283 struct net_device *dev, int strict)
1da177e4
LT		 1284{
1285 struct inet6_ifaddr * ifp;
1286 u8 hash = ipv6_addr_hash(addr);
1287
1288 read_lock_bh(&addrconf_hash_lock);
1289 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1290 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1291 continue;
1da177e4
LT		 1292 if (ipv6_addr_equal(&ifp->addr, addr) &&
1293 !(ifp->flags&IFA_F_TENTATIVE)) {
1294 if (dev == NULL || ifp->idev->dev == dev ||
1295 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1296 break;
1297 }
1298 }
1299 read_unlock_bh(&addrconf_hash_lock);
1300 return ifp != NULL;
1301}
7159039a
YH		 1302EXPORT_SYMBOL(ipv6_chk_addr);
1303
1da177e4 1304static
06bfe655
DL		 1305int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1306 struct net_device *dev)
1da177e4
LT		 1307{
1308 struct inet6_ifaddr * ifp;
1309 u8 hash = ipv6_addr_hash(addr);
1310
1311 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1312 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1313 continue;
1da177e4
LT		 1314 if (ipv6_addr_equal(&ifp->addr, addr)) {
1315 if (dev == NULL || ifp->idev->dev == dev)
1316 break;
1317 }
1318 }
1319 return ifp != NULL;
1320}
1321
52eeeb84
YH		 1322int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1323{
1324 struct inet6_dev *idev;
1325 struct inet6_ifaddr *ifa;
1326 int onlink;
1327
1328 onlink = 0;
1329 rcu_read_lock();
1330 idev = __in6_dev_get(dev);
1331 if (idev) {
1332 read_lock_bh(&idev->lock);
1333 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1334 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1335 ifa->prefix_len);
1336 if (onlink)
1337 break;
1338 }
1339 read_unlock_bh(&idev->lock);
1340 }
1341 rcu_read_unlock();
1342 return onlink;
1343}
1344
1345EXPORT_SYMBOL(ipv6_chk_prefix);
1346
9acd9f3a 1347struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1348 struct net_device *dev, int strict)
1da177e4
LT		 1349{
1350 struct inet6_ifaddr * ifp;
1351 u8 hash = ipv6_addr_hash(addr);
1352
1353 read_lock_bh(&addrconf_hash_lock);
1354 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1355 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1356 continue;
1da177e4
LT		 1357 if (ipv6_addr_equal(&ifp->addr, addr)) {
1358 if (dev == NULL || ifp->idev->dev == dev ||
1359 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1360 in6_ifa_hold(ifp);
1361 break;
1362 }
1363 }
1364 }
1365 read_unlock_bh(&addrconf_hash_lock);
1366
1367 return ifp;
1368}
1369
1370int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1371{
1372 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1373 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1374 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1375 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1376 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1377 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1378 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1379 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1380
1381 if (!sk2_rcv_saddr && !sk_ipv6only)
1382 return 1;
1383
1384 if (addr_type2 == IPV6_ADDR_ANY &&
1385 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1386 return 1;
1387
1388 if (addr_type == IPV6_ADDR_ANY &&
1389 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1390 return 1;
1391
1392 if (sk2_rcv_saddr6 &&
1393 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1394 return 1;
1395
1396 if (addr_type == IPV6_ADDR_MAPPED &&
1397 !sk2_ipv6only &&
1398 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1399 return 1;
1400
1401 return 0;
1402}
1403
1404/* Gets referenced address, destroys ifaddr */
1405
9f5336e2 1406static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1407{
1da177e4
LT		 1408 if (ifp->flags&IFA_F_PERMANENT) {
1409 spin_lock_bh(&ifp->lock);
1410 addrconf_del_timer(ifp);
1411 ifp->flags |= IFA_F_TENTATIVE;
1412 spin_unlock_bh(&ifp->lock);
1413 in6_ifa_put(ifp);
1414#ifdef CONFIG_IPV6_PRIVACY
1415 } else if (ifp->flags&IFA_F_TEMPORARY) {
1416 struct inet6_ifaddr *ifpub;
1417 spin_lock_bh(&ifp->lock);
1418 ifpub = ifp->ifpub;
1419 if (ifpub) {
1420 in6_ifa_hold(ifpub);
1421 spin_unlock_bh(&ifp->lock);
1422 ipv6_create_tempaddr(ifpub, ifp);
1423 in6_ifa_put(ifpub);
1424 } else {
1425 spin_unlock_bh(&ifp->lock);
1426 }
1427 ipv6_del_addr(ifp);
1428#endif
1429 } else
1430 ipv6_del_addr(ifp);
1431}
1432
3c21edbd
YH		 1433void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1434{
1b34be74
YH		 1435 struct inet6_dev *idev = ifp->idev;
1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437 struct in6_addr addr;
1438
1439 addr.s6_addr32[0] = htonl(0xfe800000);
1440 addr.s6_addr32[1] = 0;
1441
1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443 ipv6_addr_equal(&ifp->addr, &addr)) {
1444 /* DAD failed for link-local based on MAC address */
1445 idev->cnf.disable_ipv6 = 1;
1446 }
1447 }
1448
3c21edbd
YH		 1449 if (net_ratelimit())
1450 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1451 addrconf_dad_stop(ifp);
1452}
1da177e4
LT		 1453
1454/* Join to solicited addr multicast group. */
1455
1456void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1457{
1458 struct in6_addr maddr;
1459
1460 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1461 return;
1462
1463 addrconf_addr_solict_mult(addr, &maddr);
1464 ipv6_dev_mc_inc(dev, &maddr);
1465}
1466
1467void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1468{
1469 struct in6_addr maddr;
1470
1471 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1472 return;
1473
1474 addrconf_addr_solict_mult(addr, &maddr);
1475 __ipv6_dev_mc_dec(idev, &maddr);
1476}
1477
20380731 1478static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1479{
1480 struct in6_addr addr;
1481 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1482 if (ipv6_addr_any(&addr))
1483 return;
1484 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1485}
1486
20380731 1487static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1488{
1489 struct in6_addr addr;
1490 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1491 if (ipv6_addr_any(&addr))
1492 return;
1493 __ipv6_dev_ac_dec(ifp->idev, &addr);
1494}
1495
073a8e0e
YH		 1496static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1497{
1498 if (dev->addr_len != ETH_ALEN)
1499 return -1;
1500 memcpy(eui, dev->dev_addr, 3);
1501 memcpy(eui + 5, dev->dev_addr + 3, 3);
1502
1503 /*
1504 * The zSeries OSA network cards can be shared among various
1505 * OS instances, but the OSA cards have only one MAC address.
1506 * This leads to duplicate address conflicts in conjunction
1507 * with IPv6 if more than one instance uses the same card.
1508 *
1509 * The driver for these cards can deliver a unique 16-bit
1510 * identifier for each instance sharing the same card. It is
1511 * placed instead of 0xFFFE in the interface identifier. The
1512 * "u" bit of the interface identifier is not inverted in this
1513 * case. Hence the resulting interface identifier has local
1514 * scope according to RFC2373.
1515 */
1516 if (dev->dev_id) {
1517 eui[3] = (dev->dev_id >> 8) & 0xFF;
1518 eui[4] = dev->dev_id & 0xFF;
1519 } else {
1520 eui[3] = 0xFF;
1521 eui[4] = 0xFE;
1522 eui[0] ^= 2;
1523 }
1524 return 0;
1525}
1526
1527static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1528{
1529 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1530 if (dev->addr_len != ARCNET_ALEN)
1531 return -1;
1532 memset(eui, 0, 7);
1533 eui[7] = *(u8*)dev->dev_addr;
1534 return 0;
1535}
1536
1537static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1538{
1539 if (dev->addr_len != INFINIBAND_ALEN)
1540 return -1;
1541 memcpy(eui, dev->dev_addr + 12, 8);
1542 eui[0] |= 2;
1543 return 0;
1544}
1545
dfd982ba
YH		 1546int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1547{
1548 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1549 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1550 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1551 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1552 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1553 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1554 eui[1] = 0;
1555 eui[2] = 0x5E;
1556 eui[3] = 0xFE;
1557 memcpy(eui + 4, &addr, 4);
1558 return 0;
1559}
1560EXPORT_SYMBOL(__ipv6_isatap_ifid);
1561
1562static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1563{
1564 if (dev->priv_flags & IFF_ISATAP)
1565 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1566 return -1;
1567}
1568
1da177e4
LT		 1569static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1570{
1571 switch (dev->type) {
1572 case ARPHRD_ETHER:
1573 case ARPHRD_FDDI:
1574 case ARPHRD_IEEE802_TR:
073a8e0e 1575 return addrconf_ifid_eui48(eui, dev);
1da177e4 1576 case ARPHRD_ARCNET:
073a8e0e 1577 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1578 case ARPHRD_INFINIBAND:
073a8e0e 1579 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1580 case ARPHRD_SIT:
dfd982ba 1581 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1582 }
1583 return -1;
1584}
1585
1586static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1587{
1588 int err = -1;
1589 struct inet6_ifaddr *ifp;
1590
1591 read_lock_bh(&idev->lock);
1592 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1593 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1594 memcpy(eui, ifp->addr.s6_addr+8, 8);
1595 err = 0;
1596 break;
1597 }
1598 }
1599 read_unlock_bh(&idev->lock);
1600 return err;
1601}
1602
1603#ifdef CONFIG_IPV6_PRIVACY
1604/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1605static int __ipv6_regen_rndid(struct inet6_dev *idev)
1606{
1da177e4 1607regen:
955189ef 1608 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1609 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1610
1611 /*
1612 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1613 * check if generated address is not inappropriate
1614 *
1615 * - Reserved subnet anycast (RFC 2526)
1616 * 11111101 11....11 1xxxxxxx
c7dc89c0 1617 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1618 * 00-00-5E-FE-xx-xx-xx-xx
1619 * - value 0
1620 * - XXX: already assigned to an address on the device
1621 */
1ab1457c 1622 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1623 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1624 (idev->rndid[7]&0x80))
1625 goto regen;
1626 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1627 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1628 goto regen;
1629 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1630 goto regen;
1631 }
1632
1633 return 0;
1634}
1635
1636static void ipv6_regen_rndid(unsigned long data)
1637{
1638 struct inet6_dev *idev = (struct inet6_dev *) data;
1639 unsigned long expires;
1640
8814c4b5 1641 rcu_read_lock_bh();
1da177e4
LT		 1642 write_lock_bh(&idev->lock);
1643
1644 if (idev->dead)
1645 goto out;
1646
1647 if (__ipv6_regen_rndid(idev) < 0)
1648 goto out;
1ab1457c 1649
1da177e4 1650 expires = jiffies +
1ab1457c 1651 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1652 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1653 if (time_before(expires, jiffies)) {
1654 printk(KERN_WARNING
1655 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1656 idev->dev->name);
1657 goto out;
1658 }
1659
1660 if (!mod_timer(&idev->regen_timer, expires))
1661 in6_dev_hold(idev);
1662
1663out:
1664 write_unlock_bh(&idev->lock);
8814c4b5 1665 rcu_read_unlock_bh();
1da177e4
LT		 1666 in6_dev_put(idev);
1667}
1668
1669static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1670 int ret = 0;
1671
1672 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1673 ret = __ipv6_regen_rndid(idev);
1674 return ret;
1675}
1676#endif
1677
1678/*
1679 * Add prefix route.
1680 */
1681
1682static void
1683addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1684 unsigned long expires, u32 flags)
1da177e4 1685{
86872cb5
TG		 1686 struct fib6_config cfg = {
1687 .fc_table = RT6_TABLE_PREFIX,
1688 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1689 .fc_ifindex = dev->ifindex,
1690 .fc_expires = expires,
1691 .fc_dst_len = plen,
1692 .fc_flags = RTF_UP | flags,
c346dca1 1693 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1694 .fc_protocol = RTPROT_KERNEL,
86872cb5 1695 };
1da177e4 1696
86872cb5 1697 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1698
1699 /* Prevent useless cloning on PtP SIT.
1700 This thing is done here expecting that the whole
1701 class of non-broadcast devices need not cloning.
1702 */
0be669bb 1703#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1704 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1705 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1706#endif
1da177e4 1707
86872cb5 1708 ip6_route_add(&cfg);
1da177e4
LT		 1709}
1710
1711/* Create "default" multicast route to the interface */
1712
1713static void addrconf_add_mroute(struct net_device *dev)
1714{
86872cb5
TG		 1715 struct fib6_config cfg = {
1716 .fc_table = RT6_TABLE_LOCAL,
1717 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1718 .fc_ifindex = dev->ifindex,
1719 .fc_dst_len = 8,
1720 .fc_flags = RTF_UP,
c346dca1 1721 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1722 };
1723
1724 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1725
1726 ip6_route_add(&cfg);
1da177e4
LT		 1727}
1728
0be669bb 1729#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1730static void sit_route_add(struct net_device *dev)
1731{
86872cb5
TG		 1732 struct fib6_config cfg = {
1733 .fc_table = RT6_TABLE_MAIN,
1734 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1735 .fc_ifindex = dev->ifindex,
1736 .fc_dst_len = 96,
1737 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1738 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1739 };
1da177e4
LT		 1740
1741 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1742 ip6_route_add(&cfg);
1da177e4 1743}
0be669bb 1744#endif
1da177e4
LT		 1745
1746static void addrconf_add_lroute(struct net_device *dev)
1747{
1748 struct in6_addr addr;
1749
1750 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1751 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1752}
1753
1754static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1755{
1756 struct inet6_dev *idev;
1757
1758 ASSERT_RTNL();
1759
1760 if ((idev = ipv6_find_idev(dev)) == NULL)
1761 return NULL;
1762
1763 /* Add default multicast route */
1764 addrconf_add_mroute(dev);
1765
1766 /* Add link local route */
1767 addrconf_add_lroute(dev);
1768 return idev;
1769}
1770
1771void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1772{
1773 struct prefix_info *pinfo;
1774 __u32 valid_lft;
1775 __u32 prefered_lft;
1776 int addr_type;
1da177e4
LT		 1777 struct inet6_dev *in6_dev;
1778
1779 pinfo = (struct prefix_info *) opt;
1ab1457c 1780
1da177e4
LT		 1781 if (len < sizeof(struct prefix_info)) {
1782 ADBG(("addrconf: prefix option too short\n"));
1783 return;
1784 }
1ab1457c 1785
1da177e4
LT		 1786 /*
1787 * Validation checks ([ADDRCONF], page 19)
1788 */
1789
1790 addr_type = ipv6_addr_type(&pinfo->prefix);
1791
1792 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1793 return;
1794
1795 valid_lft = ntohl(pinfo->valid);
1796 prefered_lft = ntohl(pinfo->prefered);
1797
1798 if (prefered_lft > valid_lft) {
1799 if (net_ratelimit())
1800 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1801 return;
1802 }
1803
1804 in6_dev = in6_dev_get(dev);
1805
1806 if (in6_dev == NULL) {
1807 if (net_ratelimit())
1808 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1809 return;
1810 }
1811
1812 /*
1813 * Two things going on here:
1814 * 1) Add routes for on-link prefixes
1815 * 2) Configure prefixes with the auto flag set
1816 */
1817
4bed72e4
YH		 1818 if (pinfo->onlink) {
1819 struct rt6_info *rt;
1820 unsigned long rt_expires;
1821
6f704992
YH		 1822 /* Avoid arithmetic overflow. Really, we could
1823 * save rt_expires in seconds, likely valid_lft,
1824 * but it would require division in fib gc, that it
1825 * not good.
1826 */
4bed72e4
YH		 1827 if (HZ > USER_HZ)
1828 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1829 else
1830 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1831
4bed72e4
YH		 1832 if (addrconf_finite_timeout(rt_expires))
1833 rt_expires *= HZ;
1da177e4 1834
c346dca1 1835 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
6fda7350 1836 dev->ifindex, 1);
1da177e4 1837
2b5ead46 1838 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1839 /* Autoconf prefix route */
1840 if (valid_lft == 0) {
1841 ip6_del_rt(rt);
1842 rt = NULL;
4bed72e4 1843 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1844 /* not infinity */
1845 rt->rt6i_expires = jiffies + rt_expires;
1846 rt->rt6i_flags |= RTF_EXPIRES;
1847 } else {
1848 rt->rt6i_flags &= ~RTF_EXPIRES;
1849 rt->rt6i_expires = 0;
1da177e4
LT		 1850 }
1851 } else if (valid_lft) {
6f704992 1852 clock_t expires = 0;
4bed72e4
YH		 1853 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1854 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1855 /* not infinity */
1856 flags |= RTF_EXPIRES;
1857 expires = jiffies_to_clock_t(rt_expires);
1858 }
1da177e4 1859 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1860 dev, expires, flags);
1da177e4
LT		 1861 }
1862 if (rt)
1863 dst_release(&rt->u.dst);
1864 }
1865
1866 /* Try to figure out our local address for this prefix */
1867
1868 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1869 struct inet6_ifaddr * ifp;
1870 struct in6_addr addr;
1871 int create = 0, update_lft = 0;
53b7997f 1872 struct net *net = dev_net(dev);
1da177e4
LT		 1873
1874 if (pinfo->prefix_len == 64) {
1875 memcpy(&addr, &pinfo->prefix, 8);
1876 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1877 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1878 in6_dev_put(in6_dev);
1879 return;
1880 }
1881 goto ok;
1882 }
1883 if (net_ratelimit())
1884 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1885 pinfo->prefix_len);
1886 in6_dev_put(in6_dev);
1887 return;
1888
1889ok:
1890
53b7997f 1891 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1892
1893 if (ifp == NULL && valid_lft) {
1894 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1895 u32 addr_flags = 0;
1896
1897#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1898 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1899 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1900 addr_flags = IFA_F_OPTIMISTIC;
1901#endif
1da177e4
LT		 1902
1903 /* Do not allow to create too much of autoconfigured
1904 * addresses; this would be too easy way to crash kernel.
1905 */
1906 if (!max_addresses ||
1907 ipv6_count_addresses(in6_dev) < max_addresses)
1908 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1909 addr_type&IPV6_ADDR_SCOPE_MASK,
1910 addr_flags);
1da177e4
LT		 1911
1912 if (!ifp || IS_ERR(ifp)) {
1913 in6_dev_put(in6_dev);
1914 return;
1915 }
1916
1917 update_lft = create = 1;
1918 ifp->cstamp = jiffies;
1919 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1920 }
1921
1922 if (ifp) {
1923 int flags;
1924 unsigned long now;
1925#ifdef CONFIG_IPV6_PRIVACY
1926 struct inet6_ifaddr *ift;
1927#endif
1928 u32 stored_lft;
1929
1930 /* update lifetime (RFC2462 5.5.3 e) */
1931 spin_lock(&ifp->lock);
1932 now = jiffies;
1933 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1934 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1935 else
1936 stored_lft = 0;
1937 if (!update_lft && stored_lft) {
1938 if (valid_lft > MIN_VALID_LIFETIME ||
1939 valid_lft > stored_lft)
1940 update_lft = 1;
1941 else if (stored_lft <= MIN_VALID_LIFETIME) {
1942 /* valid_lft <= stored_lft is always true */
1943 /* XXX: IPsec */
1944 update_lft = 0;
1945 } else {
1946 valid_lft = MIN_VALID_LIFETIME;
1947 if (valid_lft < prefered_lft)
1948 prefered_lft = valid_lft;
1949 update_lft = 1;
1950 }
1951 }
1952
1953 if (update_lft) {
1954 ifp->valid_lft = valid_lft;
1955 ifp->prefered_lft = prefered_lft;
1956 ifp->tstamp = now;
1957 flags = ifp->flags;
1958 ifp->flags &= ~IFA_F_DEPRECATED;
1959 spin_unlock(&ifp->lock);
1960
1961 if (!(flags&IFA_F_TENTATIVE))
1962 ipv6_ifa_notify(0, ifp);
1963 } else
1964 spin_unlock(&ifp->lock);
1965
1966#ifdef CONFIG_IPV6_PRIVACY
1967 read_lock_bh(&in6_dev->lock);
1968 /* update all temporary addresses in the list */
1969 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1970 /*
1971 * When adjusting the lifetimes of an existing
1972 * temporary address, only lower the lifetimes.
1973 * Implementations must not increase the
1974 * lifetimes of an existing temporary address
1975 * when processing a Prefix Information Option.
1976 */
c6fbfac2
BB		 1977 if (ifp != ift->ifpub)
1978 continue;
1979
1da177e4
LT		 1980 spin_lock(&ift->lock);
1981 flags = ift->flags;
1982 if (ift->valid_lft > valid_lft &&
1983 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1985 if (ift->prefered_lft > prefered_lft &&
1986 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1987 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1988 spin_unlock(&ift->lock);
1989 if (!(flags&IFA_F_TENTATIVE))
1990 ipv6_ifa_notify(0, ift);
1991 }
1992
1993 if (create && in6_dev->cnf.use_tempaddr > 0) {
1994 /*
1995 * When a new public address is created as described in [ADDRCONF],
1996 * also create a new temporary address.
1997 */
1ab1457c 1998 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1999 ipv6_create_tempaddr(ifp, NULL);
2000 } else {
2001 read_unlock_bh(&in6_dev->lock);
2002 }
2003#endif
2004 in6_ifa_put(ifp);
2005 addrconf_verify(0);
2006 }
2007 }
2008 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2009 in6_dev_put(in6_dev);
2010}
2011
2012/*
2013 * Set destination address.
2014 * Special case for SIT interfaces where we create a new "virtual"
2015 * device.
2016 */
af284937 2017int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2018{
2019 struct in6_ifreq ireq;
2020 struct net_device *dev;
2021 int err = -EINVAL;
2022
2023 rtnl_lock();
2024
2025 err = -EFAULT;
2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027 goto err_exit;
2028
af284937 2029 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2030
2031 err = -ENODEV;
2032 if (dev == NULL)
2033 goto err_exit;
2034
0be669bb 2035#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2036 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2037 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2038 struct ifreq ifr;
1da177e4
LT		 2039 struct ip_tunnel_parm p;
2040
2041 err = -EADDRNOTAVAIL;
2042 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2043 goto err_exit;
2044
2045 memset(&p, 0, sizeof(p));
2046 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2047 p.iph.saddr = 0;
2048 p.iph.version = 4;
2049 p.iph.ihl = 5;
2050 p.iph.protocol = IPPROTO_IPV6;
2051 p.iph.ttl = 64;
d20b3109 2052 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2053
5bc3eb7e
SH		 2054 if (ops->ndo_do_ioctl) {
2055 mm_segment_t oldfs = get_fs();
2056
2057 set_fs(KERNEL_DS);
2058 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2059 set_fs(oldfs);
2060 } else
2061 err = -EOPNOTSUPP;
1da177e4
LT		 2062
2063 if (err == 0) {
2064 err = -ENOBUFS;
af284937
DL		 2065 dev = __dev_get_by_name(net, p.name);
2066 if (!dev)
1da177e4
LT		 2067 goto err_exit;
2068 err = dev_open(dev);
2069 }
2070 }
0be669bb 2071#endif
1da177e4
LT		 2072
2073err_exit:
2074 rtnl_unlock();
2075 return err;
2076}
2077
2078/*
2079 * Manual configuration of address on an interface
2080 */
af284937 2081static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2082 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2083 __u32 valid_lft)
1da177e4
LT		 2084{
2085 struct inet6_ifaddr *ifp;
2086 struct inet6_dev *idev;
2087 struct net_device *dev;
2088 int scope;
6f704992
YH		 2089 u32 flags;
2090 clock_t expires;
4bed72e4 2091 unsigned long timeout;
1da177e4
LT		 2092
2093 ASSERT_RTNL();
1ab1457c 2094
24ef0da7
TG		 2095 if (plen > 128)
2096 return -EINVAL;
2097
0778769d
NT		 2098 /* check the lifetime */
2099 if (!valid_lft || prefered_lft > valid_lft)
2100 return -EINVAL;
2101
af284937
DL		 2102 dev = __dev_get_by_index(net, ifindex);
2103 if (!dev)
1da177e4 2104 return -ENODEV;
1ab1457c 2105
1da177e4
LT		 2106 if ((idev = addrconf_add_dev(dev)) == NULL)
2107 return -ENOBUFS;
2108
2109 scope = ipv6_addr_scope(pfx);
2110
4bed72e4
YH		 2111 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2112 if (addrconf_finite_timeout(timeout)) {
2113 expires = jiffies_to_clock_t(timeout * HZ);
2114 valid_lft = timeout;
6f704992 2115 flags = RTF_EXPIRES;
4bed72e4
YH		 2116 } else {
2117 expires = 0;
2118 flags = 0;
2119 ifa_flags |= IFA_F_PERMANENT;
6f704992 2120 }
0778769d 2121
4bed72e4
YH		 2122 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2123 if (addrconf_finite_timeout(timeout)) {
2124 if (timeout == 0)
2125 ifa_flags |= IFA_F_DEPRECATED;
2126 prefered_lft = timeout;
2127 }
0778769d
NT		 2128
2129 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2130
1da177e4 2131 if (!IS_ERR(ifp)) {
06aebfb7 2132 spin_lock_bh(&ifp->lock);
0778769d
NT		 2133 ifp->valid_lft = valid_lft;
2134 ifp->prefered_lft = prefered_lft;
2135 ifp->tstamp = jiffies;
06aebfb7 2136 spin_unlock_bh(&ifp->lock);
0778769d 2137
46d48046 2138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2139 expires, flags);
95c385b4
NH		 2140 /*
2141 * Note that section 3.1 of RFC 4429 indicates
2142 * that the Optimistic flag should not be set for
2143 * manually configured addresses
2144 */
1da177e4
LT		 2145 addrconf_dad_start(ifp, 0);
2146 in6_ifa_put(ifp);
0778769d 2147 addrconf_verify(0);
1da177e4
LT		 2148 return 0;
2149 }
2150
2151 return PTR_ERR(ifp);
2152}
2153
af284937 2154static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2155 unsigned int plen)
1da177e4
LT		 2156{
2157 struct inet6_ifaddr *ifp;
2158 struct inet6_dev *idev;
2159 struct net_device *dev;
1ab1457c 2160
24ef0da7
TG		 2161 if (plen > 128)
2162 return -EINVAL;
2163
af284937
DL		 2164 dev = __dev_get_by_index(net, ifindex);
2165 if (!dev)
1da177e4
LT		 2166 return -ENODEV;
2167
2168 if ((idev = __in6_dev_get(dev)) == NULL)
2169 return -ENXIO;
2170
2171 read_lock_bh(&idev->lock);
2172 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2173 if (ifp->prefix_len == plen &&
2174 ipv6_addr_equal(pfx, &ifp->addr)) {
2175 in6_ifa_hold(ifp);
2176 read_unlock_bh(&idev->lock);
1ab1457c 2177
1da177e4
LT		 2178 ipv6_del_addr(ifp);
2179
2180 /* If the last address is deleted administratively,
2181 disable IPv6 on this interface.
2182 */
2183 if (idev->addr_list == NULL)
2184 addrconf_ifdown(idev->dev, 1);
2185 return 0;
2186 }
2187 }
2188 read_unlock_bh(&idev->lock);
2189 return -EADDRNOTAVAIL;
2190}
2191
2192
af284937 2193int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2194{
2195 struct in6_ifreq ireq;
2196 int err;
1ab1457c 2197
1da177e4
LT		 2198 if (!capable(CAP_NET_ADMIN))
2199 return -EPERM;
1ab1457c 2200
1da177e4
LT		 2201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2202 return -EFAULT;
2203
2204 rtnl_lock();
af284937
DL		 2205 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2206 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2207 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2208 rtnl_unlock();
2209 return err;
2210}
2211
af284937 2212int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2213{
2214 struct in6_ifreq ireq;
2215 int err;
1ab1457c 2216
1da177e4
LT		 2217 if (!capable(CAP_NET_ADMIN))
2218 return -EPERM;
2219
2220 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2221 return -EFAULT;
2222
2223 rtnl_lock();
af284937
DL		 2224 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2225 ireq.ifr6_prefixlen);
1da177e4
LT		 2226 rtnl_unlock();
2227 return err;
2228}
2229
0be669bb 2230#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2231static void sit_add_v4_addrs(struct inet6_dev *idev)
2232{
2233 struct inet6_ifaddr * ifp;
2234 struct in6_addr addr;
2235 struct net_device *dev;
c346dca1 2236 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2237 int scope;
2238
2239 ASSERT_RTNL();
2240
2241 memset(&addr, 0, sizeof(struct in6_addr));
2242 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2243
2244 if (idev->dev->flags&IFF_POINTOPOINT) {
2245 addr.s6_addr32[0] = htonl(0xfe800000);
2246 scope = IFA_LINK;
2247 } else {
2248 scope = IPV6_ADDR_COMPATv4;
2249 }
2250
2251 if (addr.s6_addr32[3]) {
2252 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2253 if (!IS_ERR(ifp)) {
2254 spin_lock_bh(&ifp->lock);
2255 ifp->flags &= ~IFA_F_TENTATIVE;
2256 spin_unlock_bh(&ifp->lock);
2257 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2258 in6_ifa_put(ifp);
2259 }
2260 return;
2261 }
2262
6fda7350 2263 for_each_netdev(net, dev) {
e5ed6399 2264 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2265 if (in_dev && (dev->flags & IFF_UP)) {
2266 struct in_ifaddr * ifa;
2267
2268 int flag = scope;
2269
2270 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2271 int plen;
2272
2273 addr.s6_addr32[3] = ifa->ifa_local;
2274
2275 if (ifa->ifa_scope == RT_SCOPE_LINK)
2276 continue;
2277 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2278 if (idev->dev->flags&IFF_POINTOPOINT)
2279 continue;
2280 flag |= IFA_HOST;
2281 }
2282 if (idev->dev->flags&IFF_POINTOPOINT)
2283 plen = 64;
2284 else
2285 plen = 96;
2286
2287 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2288 IFA_F_PERMANENT);
2289 if (!IS_ERR(ifp)) {
2290 spin_lock_bh(&ifp->lock);
2291 ifp->flags &= ~IFA_F_TENTATIVE;
2292 spin_unlock_bh(&ifp->lock);
2293 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2294 in6_ifa_put(ifp);
2295 }
2296 }
2297 }
1ab1457c 2298 }
1da177e4 2299}
0be669bb 2300#endif
1da177e4
LT		 2301
2302static void init_loopback(struct net_device *dev)
2303{
2304 struct inet6_dev *idev;
2305 struct inet6_ifaddr * ifp;
2306
2307 /* ::1 */
2308
2309 ASSERT_RTNL();
2310
2311 if ((idev = ipv6_find_idev(dev)) == NULL) {
2312 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2313 return;
2314 }
2315
2316 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2317 if (!IS_ERR(ifp)) {
2318 spin_lock_bh(&ifp->lock);
2319 ifp->flags &= ~IFA_F_TENTATIVE;
2320 spin_unlock_bh(&ifp->lock);
2321 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2322 in6_ifa_put(ifp);
2323 }
2324}
2325
2326static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2327{
2328 struct inet6_ifaddr * ifp;
95c385b4
NH		 2329 u32 addr_flags = IFA_F_PERMANENT;
2330
2331#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2332 if (idev->cnf.optimistic_dad &&
702beb87 2333 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2334 addr_flags |= IFA_F_OPTIMISTIC;
2335#endif
1da177e4 2336
95c385b4
NH		 2337
2338 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2339 if (!IS_ERR(ifp)) {
46d48046 2340 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2341 addrconf_dad_start(ifp, 0);
2342 in6_ifa_put(ifp);
2343 }
2344}
2345
2346static void addrconf_dev_config(struct net_device *dev)
2347{
2348 struct in6_addr addr;
2349 struct inet6_dev * idev;
2350
2351 ASSERT_RTNL();
2352
74235a25
HX		 2353 if ((dev->type != ARPHRD_ETHER) &&
2354 (dev->type != ARPHRD_FDDI) &&
2355 (dev->type != ARPHRD_IEEE802_TR) &&
2356 (dev->type != ARPHRD_ARCNET) &&
2357 (dev->type != ARPHRD_INFINIBAND)) {
2358 /* Alas, we support only Ethernet autoconfiguration. */
2359 return;
2360 }
2361
1da177e4
LT		 2362 idev = addrconf_add_dev(dev);
2363 if (idev == NULL)
2364 return;
2365
2366 memset(&addr, 0, sizeof(struct in6_addr));
2367 addr.s6_addr32[0] = htonl(0xFE800000);
2368
2369 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2370 addrconf_add_linklocal(idev, &addr);
2371}
2372
0be669bb 2373#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2374static void addrconf_sit_config(struct net_device *dev)
2375{
2376 struct inet6_dev *idev;
2377
2378 ASSERT_RTNL();
2379
1ab1457c
YH		 2380 /*
2381 * Configure the tunnel with one of our IPv4
2382 * addresses... we should configure all of
1da177e4
LT		 2383 * our v4 addrs in the tunnel
2384 */
2385
2386 if ((idev = ipv6_find_idev(dev)) == NULL) {
2387 printk(KERN_DEBUG "init sit: add_dev failed\n");
2388 return;
2389 }
2390
c7dc89c0
FT		 2391 if (dev->priv_flags & IFF_ISATAP) {
2392 struct in6_addr addr;
2393
2394 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2395 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2396 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2397 addrconf_add_linklocal(idev, &addr);
2398 return;
2399 }
2400
1da177e4
LT		 2401 sit_add_v4_addrs(idev);
2402
2403 if (dev->flags&IFF_POINTOPOINT) {
2404 addrconf_add_mroute(dev);
2405 addrconf_add_lroute(dev);
2406 } else
2407 sit_route_add(dev);
2408}
0be669bb 2409#endif
1da177e4
LT		 2410
2411static inline int
2412ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2413{
2414 struct in6_addr lladdr;
2415
95c385b4 2416 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2417 addrconf_add_linklocal(idev, &lladdr);
2418 return 0;
2419 }
2420 return -1;
2421}
2422
2423static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2424{
2425 struct net_device *link_dev;
c346dca1 2426 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2427
2428 /* first try to inherit the link-local address from the link device */
2429 if (idev->dev->iflink &&
6fda7350 2430 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2431 if (!ipv6_inherit_linklocal(idev, link_dev))
2432 return;
2433 }
2434 /* then try to inherit it from any device */
6fda7350 2435 for_each_netdev(net, link_dev) {
1da177e4
LT		 2436 if (!ipv6_inherit_linklocal(idev, link_dev))
2437 return;
2438 }
2439 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2440}
2441
2442/*
2443 * Autoconfigure tunnel with a link-local address so routing protocols,
2444 * DHCPv6, MLD etc. can be run over the virtual link
2445 */
2446
2447static void addrconf_ip6_tnl_config(struct net_device *dev)
2448{
2449 struct inet6_dev *idev;
2450
2451 ASSERT_RTNL();
2452
2453 if ((idev = addrconf_add_dev(dev)) == NULL) {
2454 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2455 return;
2456 }
2457 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2458}
2459
1ab1457c 2460static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2461 void * data)
2462{
2463 struct net_device *dev = (struct net_device *) data;
74235a25 2464 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2465 int run_pending = 0;
b217d616 2466 int err;
1da177e4
LT		 2467
2468 switch(event) {
45ba9dd2 2469 case NETDEV_REGISTER:
74235a25 2470 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2471 idev = ipv6_add_dev(dev);
2472 if (!idev)
b217d616 2473 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2474 }
2475 break;
1da177e4 2476 case NETDEV_UP:
3c21edbd 2477 case NETDEV_CHANGE:
c2edacf8
JV		 2478 if (dev->flags & IFF_SLAVE)
2479 break;
2480
3c21edbd 2481 if (event == NETDEV_UP) {
f24e3d65 2482 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2483 /* device is not ready yet. */
2484 printk(KERN_INFO
2485 "ADDRCONF(NETDEV_UP): %s: "
2486 "link is not ready\n",
2487 dev->name);
2488 break;
2489 }
99081049 2490
d31c7b8f
EP		 2491 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2492 idev = ipv6_add_dev(dev);
2493
e3ec6cfc 2494 if (idev) {
99081049 2495 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2496 run_pending = 1;
2497 }
3c21edbd 2498 } else {
f24e3d65 2499 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2500 /* device is still not ready. */
2501 break;
2502 }
2503
2504 if (idev) {
2505 if (idev->if_flags & IF_READY) {
2506 /* device is already configured. */
2507 break;
2508 }
2509 idev->if_flags |= IF_READY;
2510 }
2511
2512 printk(KERN_INFO
2513 "ADDRCONF(NETDEV_CHANGE): %s: "
2514 "link becomes ready\n",
2515 dev->name);
2516
c5e33bdd 2517 run_pending = 1;
3c21edbd
YH		 2518 }
2519
1da177e4 2520 switch(dev->type) {
0be669bb 2521#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2522 case ARPHRD_SIT:
2523 addrconf_sit_config(dev);
2524 break;
0be669bb 2525#endif
1da177e4
LT		 2526 case ARPHRD_TUNNEL6:
2527 addrconf_ip6_tnl_config(dev);
2528 break;
2529 case ARPHRD_LOOPBACK:
2530 init_loopback(dev);
2531 break;
2532
2533 default:
2534 addrconf_dev_config(dev);
2535 break;
3ff50b79 2536 }
1da177e4 2537 if (idev) {
c5e33bdd
YH		 2538 if (run_pending)
2539 addrconf_dad_run(idev);
2540
1da177e4
LT		 2541 /* If the MTU changed during the interface down, when the
2542 interface up, the changed MTU must be reflected in the
2543 idev as well as routers.
2544 */
2545 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2546 rt6_mtu_change(dev, dev->mtu);
2547 idev->cnf.mtu6 = dev->mtu;
2548 }
2549 idev->tstamp = jiffies;
2550 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2551 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2552 stop IPv6 on this interface.
2553 */
2554 if (dev->mtu < IPV6_MIN_MTU)
2555 addrconf_ifdown(dev, event != NETDEV_DOWN);
2556 }
2557 break;
2558
2559 case NETDEV_CHANGEMTU:
d31c7b8f 2560 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2561 rt6_mtu_change(dev, dev->mtu);
2562 idev->cnf.mtu6 = dev->mtu;
2563 break;
2564 }
2565
d31c7b8f
EP		 2566 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2567 idev = ipv6_add_dev(dev);
2568 if (idev)
2569 break;
2570 }
2571
1da177e4
LT		 2572 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2573
2574 case NETDEV_DOWN:
2575 case NETDEV_UNREGISTER:
2576 /*
2577 * Remove all addresses from this interface.
2578 */
2579 addrconf_ifdown(dev, event != NETDEV_DOWN);
2580 break;
3c21edbd 2581
1da177e4 2582 case NETDEV_CHANGENAME:
1da177e4 2583 if (idev) {
5632c515 2584 snmp6_unregister_dev(idev);
408c4768 2585 addrconf_sysctl_unregister(idev);
f52295a9 2586 addrconf_sysctl_register(idev);
b217d616
HX		 2587 err = snmp6_register_dev(idev);
2588 if (err)
2589 return notifier_from_errno(err);
5632c515 2590 }
1da177e4 2591 break;
3ff50b79 2592 }
1da177e4
LT		 2593
2594 return NOTIFY_OK;
2595}
2596
2597/*
2598 * addrconf module should be notified of a device going up
2599 */
2600static struct notifier_block ipv6_dev_notf = {
2601 .notifier_call = addrconf_notify,
2602 .priority = 0
2603};
2604
2605static int addrconf_ifdown(struct net_device *dev, int how)
2606{
2607 struct inet6_dev *idev;
2608 struct inet6_ifaddr *ifa, **bifa;
c346dca1 2609 struct net *net = dev_net(dev);
1da177e4
LT		 2610 int i;
2611
2612 ASSERT_RTNL();
2613
eb867579 2614 if ((dev->flags & IFF_LOOPBACK) && how == 1)
1da177e4
LT		 2615 how = 0;
2616
f3db4851 2617 rt6_ifdown(net, dev);
1da177e4
LT		 2618 neigh_ifdown(&nd_tbl, dev);
2619
2620 idev = __in6_dev_get(dev);
2621 if (idev == NULL)
2622 return -ENODEV;
2623
2624 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2625 Do not dev_put!
1da177e4 2626 */
439e2385 2627 if (how) {
1da177e4 2628 idev->dead = 1;
8814c4b5
YH		 2629
2630 /* protected by rtnl_lock */
2631 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2632
2633 /* Step 1.5: remove snmp6 entry */
2634 snmp6_unregister_dev(idev);
2635
2636 }
2637
2638 /* Step 2: clear hash table */
2639 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2640 bifa = &inet6_addr_lst[i];
2641
2642 write_lock_bh(&addrconf_hash_lock);
2643 while ((ifa = *bifa) != NULL) {
2644 if (ifa->idev == idev) {
2645 *bifa = ifa->lst_next;
2646 ifa->lst_next = NULL;
2647 addrconf_del_timer(ifa);
2648 in6_ifa_put(ifa);
2649 continue;
2650 }
2651 bifa = &ifa->lst_next;
2652 }
2653 write_unlock_bh(&addrconf_hash_lock);
2654 }
2655
2656 write_lock_bh(&idev->lock);
2657
2658 /* Step 3: clear flags for stateless addrconf */
439e2385 2659 if (!how)
3c21edbd 2660 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2661
2662 /* Step 4: clear address list */
2663#ifdef CONFIG_IPV6_PRIVACY
439e2385 2664 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2665 in6_dev_put(idev);
2666
2667 /* clear tempaddr list */
2668 while ((ifa = idev->tempaddr_list) != NULL) {
2669 idev->tempaddr_list = ifa->tmp_next;
2670 ifa->tmp_next = NULL;
2671 ifa->dead = 1;
2672 write_unlock_bh(&idev->lock);
2673 spin_lock_bh(&ifa->lock);
2674
2675 if (ifa->ifpub) {
2676 in6_ifa_put(ifa->ifpub);
2677 ifa->ifpub = NULL;
2678 }
2679 spin_unlock_bh(&ifa->lock);
2680 in6_ifa_put(ifa);
2681 write_lock_bh(&idev->lock);
2682 }
2683#endif
2684 while ((ifa = idev->addr_list) != NULL) {
2685 idev->addr_list = ifa->if_next;
2686 ifa->if_next = NULL;
2687 ifa->dead = 1;
2688 addrconf_del_timer(ifa);
2689 write_unlock_bh(&idev->lock);
2690
2691 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2692 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2693 in6_ifa_put(ifa);
2694
2695 write_lock_bh(&idev->lock);
2696 }
2697 write_unlock_bh(&idev->lock);
2698
2699 /* Step 5: Discard multicast list */
2700
439e2385 2701 if (how)
1da177e4
LT		 2702 ipv6_mc_destroy_dev(idev);
2703 else
2704 ipv6_mc_down(idev);
2705
1da177e4 2706 idev->tstamp = jiffies;
1ab1457c 2707
1da177e4
LT		 2708 /* Shot the device (if unregistered) */
2709
439e2385 2710 if (how) {
408c4768 2711 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2712 neigh_parms_release(&nd_tbl, idev->nd_parms);
2713 neigh_ifdown(&nd_tbl, dev);
2714 in6_dev_put(idev);
2715 }
2716 return 0;
2717}
2718
2719static void addrconf_rs_timer(unsigned long data)
2720{
2721 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2722
2723 if (ifp->idev->cnf.forwarding)
2724 goto out;
2725
2726 if (ifp->idev->if_flags & IF_RA_RCVD) {
2727 /*
2728 * Announcement received after solicitation
2729 * was sent
2730 */
2731 goto out;
2732 }
2733
2734 spin_lock(&ifp->lock);
2735 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
1da177e4
LT		 2736 /* The wait after the last probe can be shorter */
2737 addrconf_mod_timer(ifp, AC_RS,
2738 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2739 ifp->idev->cnf.rtr_solicit_delay :
2740 ifp->idev->cnf.rtr_solicit_interval);
2741 spin_unlock(&ifp->lock);
2742
f3ee4010 2743 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2744 } else {
2745 spin_unlock(&ifp->lock);
2746 /*
2747 * Note: we do not support deprecated "all on-link"
2748 * assumption any longer.
2749 */
2750 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2751 ifp->idev->dev->name);
2752 }
2753
2754out:
2755 in6_ifa_put(ifp);
2756}
2757
2758/*
2759 * Duplicate Address Detection
2760 */
3c21edbd
YH		 2761static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2762{
2763 unsigned long rand_num;
2764 struct inet6_dev *idev = ifp->idev;
2765
95c385b4
NH		 2766 if (ifp->flags & IFA_F_OPTIMISTIC)
2767 rand_num = 0;
2768 else
2769 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2770
3c21edbd
YH		 2771 ifp->probes = idev->cnf.dad_transmits;
2772 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2773}
2774
e431b8c0 2775static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2776{
2777 struct inet6_dev *idev = ifp->idev;
2778 struct net_device *dev = idev->dev;
1da177e4
LT		 2779
2780 addrconf_join_solict(dev, &ifp->addr);
2781
1da177e4 2782 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2783
2784 read_lock_bh(&idev->lock);
2785 if (ifp->dead)
2786 goto out;
2787 spin_lock_bh(&ifp->lock);
2788
2789 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2790 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2791 !(ifp->flags&IFA_F_TENTATIVE) ||
2792 ifp->flags & IFA_F_NODAD) {
95c385b4 2793 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2794 spin_unlock_bh(&ifp->lock);
2795 read_unlock_bh(&idev->lock);
2796
2797 addrconf_dad_completed(ifp);
2798 return;
2799 }
2800
6732bade 2801 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2802 spin_unlock_bh(&ifp->lock);
6732bade 2803 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2804 /*
2805 * If the defice is not ready:
2806 * - keep it tentative if it is a permanent address.
2807 * - otherwise, kill it.
2808 */
2809 in6_ifa_hold(ifp);
2810 addrconf_dad_stop(ifp);
6732bade 2811 return;
3c21edbd 2812 }
95c385b4
NH		 2813
2814 /*
2815 * Optimistic nodes can start receiving
2816 * Frames right away
2817 */
2818 if(ifp->flags & IFA_F_OPTIMISTIC)
2819 ip6_ins_rt(ifp->rt);
2820
6732bade
YH		 2821 addrconf_dad_kick(ifp);
2822 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2823out:
2824 read_unlock_bh(&idev->lock);
2825}
2826
2827static void addrconf_dad_timer(unsigned long data)
2828{
2829 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2830 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2831 struct in6_addr mcaddr;
2832
2833 read_lock_bh(&idev->lock);
2834 if (idev->dead) {
2835 read_unlock_bh(&idev->lock);
2836 goto out;
2837 }
1b34be74
YH		 2838 if (idev->cnf.accept_dad > 1 && idev->cnf.disable_ipv6) {
2839 read_unlock_bh(&idev->lock);
2840 addrconf_dad_failure(ifp);
2841 return;
2842 }
1da177e4
LT		 2843 spin_lock_bh(&ifp->lock);
2844 if (ifp->probes == 0) {
2845 /*
2846 * DAD was successful
2847 */
2848
95c385b4 2849 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2850 spin_unlock_bh(&ifp->lock);
2851 read_unlock_bh(&idev->lock);
2852
2853 addrconf_dad_completed(ifp);
2854
2855 goto out;
2856 }
2857
2858 ifp->probes--;
2859 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2860 spin_unlock_bh(&ifp->lock);
2861 read_unlock_bh(&idev->lock);
2862
2863 /* send a neighbour solicitation for our addr */
1da177e4 2864 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2865 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2866out:
2867 in6_ifa_put(ifp);
2868}
2869
2870static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2871{
2872 struct net_device * dev = ifp->idev->dev;
2873
2874 /*
2875 * Configure the address for reception. Now it is valid.
2876 */
2877
2878 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2879
2880 /* If added prefix is link local and forwarding is off,
2881 start sending router solicitations.
2882 */
2883
2884 if (ifp->idev->cnf.forwarding == 0 &&
2885 ifp->idev->cnf.rtr_solicits > 0 &&
2886 (dev->flags&IFF_LOOPBACK) == 0 &&
2887 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2888 /*
2889 * If a host as already performed a random delay
2890 * [...] as part of DAD [...] there is no need
2891 * to delay again before sending the first RS
2892 */
f3ee4010 2893 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2894
2895 spin_lock_bh(&ifp->lock);
2896 ifp->probes = 1;
2897 ifp->idev->if_flags |= IF_RS_SENT;
2898 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2899 spin_unlock_bh(&ifp->lock);
2900 }
2901}
2902
c5e33bdd
YH		 2903static void addrconf_dad_run(struct inet6_dev *idev) {
2904 struct inet6_ifaddr *ifp;
2905
2906 read_lock_bh(&idev->lock);
2907 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2908 spin_lock_bh(&ifp->lock);
2909 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2910 spin_unlock_bh(&ifp->lock);
2911 continue;
2912 }
2913 spin_unlock_bh(&ifp->lock);
2914 addrconf_dad_kick(ifp);
2915 }
2916 read_unlock_bh(&idev->lock);
2917}
2918
1da177e4
LT		 2919#ifdef CONFIG_PROC_FS
2920struct if6_iter_state {
3c40090a 2921 struct seq_net_private p;
1da177e4
LT		 2922 int bucket;
2923};
2924
2925static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2926{
2927 struct inet6_ifaddr *ifa = NULL;
2928 struct if6_iter_state *state = seq->private;
1218854a 2929 struct net *net = seq_file_net(seq);
1da177e4
LT		 2930
2931 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2932 ifa = inet6_addr_lst[state->bucket];
3c40090a 2933
878628fb 2934 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2935 ifa = ifa->lst_next;
1da177e4
LT		 2936 if (ifa)
2937 break;
2938 }
2939 return ifa;
2940}
2941
2942static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2943{
2944 struct if6_iter_state *state = seq->private;
1218854a 2945 struct net *net = seq_file_net(seq);
1da177e4
LT		 2946
2947 ifa = ifa->lst_next;
2948try_again:
3c40090a 2949 if (ifa) {
878628fb 2950 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2951 ifa = ifa->lst_next;
2952 goto try_again;
2953 }
2954 }
2955
1da177e4
LT		 2956 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2957 ifa = inet6_addr_lst[state->bucket];
2958 goto try_again;
2959 }
3c40090a 2960
1da177e4
LT		 2961 return ifa;
2962}
2963
2964static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2965{
2966 struct inet6_ifaddr *ifa = if6_get_first(seq);
2967
2968 if (ifa)
2969 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2970 --pos;
2971 return pos ? NULL : ifa;
2972}
2973
2974static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2975 __acquires(addrconf_hash_lock)
1da177e4
LT		 2976{
2977 read_lock_bh(&addrconf_hash_lock);
2978 return if6_get_idx(seq, *pos);
2979}
2980
2981static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2982{
2983 struct inet6_ifaddr *ifa;
2984
2985 ifa = if6_get_next(seq, v);
2986 ++*pos;
2987 return ifa;
2988}
2989
2990static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2991 __releases(addrconf_hash_lock)
1da177e4
LT		 2992{
2993 read_unlock_bh(&addrconf_hash_lock);
2994}
2995
2996static int if6_seq_show(struct seq_file *seq, void *v)
2997{
2998 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 2999 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3000 &ifp->addr,
1da177e4
LT		 3001 ifp->idev->dev->ifindex,
3002 ifp->prefix_len,
3003 ifp->scope,
3004 ifp->flags,
3005 ifp->idev->dev->name);
3006 return 0;
3007}
3008
56b3d975 3009static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3010 .start = if6_seq_start,
3011 .next = if6_seq_next,
3012 .show = if6_seq_show,
3013 .stop = if6_seq_stop,
3014};
3015
3016static int if6_seq_open(struct inode *inode, struct file *file)
3017{
3c40090a
DL		 3018 return seq_open_net(inode, file, &if6_seq_ops,
3019 sizeof(struct if6_iter_state));
1da177e4
LT		 3020}
3021
9a32144e 3022static const struct file_operations if6_fops = {
1da177e4
LT		 3023 .owner = THIS_MODULE,
3024 .open = if6_seq_open,
3025 .read = seq_read,
3026 .llseek = seq_lseek,
3c40090a 3027 .release = seq_release_net,
1da177e4
LT		 3028};
3029
3c40090a 3030static int if6_proc_net_init(struct net *net)
1da177e4 3031{
3c40090a 3032 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3033 return -ENOMEM;
3034 return 0;
3035}
3036
3c40090a
DL		 3037static void if6_proc_net_exit(struct net *net)
3038{
3039 proc_net_remove(net, "if_inet6");
3040}
3041
3042static struct pernet_operations if6_proc_net_ops = {
3043 .init = if6_proc_net_init,
3044 .exit = if6_proc_net_exit,
3045};
3046
3047int __init if6_proc_init(void)
3048{
3049 return register_pernet_subsys(&if6_proc_net_ops);
3050}
3051
1da177e4
LT		 3052void if6_proc_exit(void)
3053{
3c40090a 3054 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3055}
3056#endif /* CONFIG_PROC_FS */
3057
59fbb3a6 3058#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3059/* Check if address is a home address configured on any interface. */
389f6612 3060int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3061{
3062 int ret = 0;
3063 struct inet6_ifaddr * ifp;
3064 u8 hash = ipv6_addr_hash(addr);
3065 read_lock_bh(&addrconf_hash_lock);
3066 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3067 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3068 continue;
caad295f 3069 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3070 (ifp->flags & IFA_F_HOMEADDRESS)) {
3071 ret = 1;
3072 break;
3073 }
3074 }
3075 read_unlock_bh(&addrconf_hash_lock);
3076 return ret;
3077}
3078#endif
3079
1da177e4
LT		 3080/*
3081 * Periodic address status verification
3082 */
3083
3084static void addrconf_verify(unsigned long foo)
3085{
3086 struct inet6_ifaddr *ifp;
3087 unsigned long now, next;
3088 int i;
3089
3090 spin_lock_bh(&addrconf_verify_lock);
3091 now = jiffies;
3092 next = now + ADDR_CHECK_FREQUENCY;
3093
3094 del_timer(&addr_chk_timer);
3095
3096 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3097
3098restart:
5d5780df 3099 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3100 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3101 unsigned long age;
3102#ifdef CONFIG_IPV6_PRIVACY
3103 unsigned long regen_advance;
3104#endif
3105
3106 if (ifp->flags & IFA_F_PERMANENT)
3107 continue;
3108
3109 spin_lock(&ifp->lock);
3110 age = (now - ifp->tstamp) / HZ;
3111
3112#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3113 regen_advance = ifp->idev->cnf.regen_max_retry *
3114 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3115 ifp->idev->nd_parms->retrans_time / HZ;
3116#endif
3117
8f27ebb9
YH		 3118 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3119 age >= ifp->valid_lft) {
1da177e4
LT		 3120 spin_unlock(&ifp->lock);
3121 in6_ifa_hold(ifp);
5d5780df 3122 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3123 ipv6_del_addr(ifp);
3124 goto restart;
8f27ebb9
YH		 3125 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3126 spin_unlock(&ifp->lock);
3127 continue;
1da177e4
LT		 3128 } else if (age >= ifp->prefered_lft) {
3129 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3130 int deprecate = 0;
3131
3132 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3133 deprecate = 1;
3134 ifp->flags |= IFA_F_DEPRECATED;
3135 }
3136
3137 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3138 next = ifp->tstamp + ifp->valid_lft * HZ;
3139
3140 spin_unlock(&ifp->lock);
3141
3142 if (deprecate) {
3143 in6_ifa_hold(ifp);
5d5780df 3144 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3145
3146 ipv6_ifa_notify(0, ifp);
3147 in6_ifa_put(ifp);
3148 goto restart;
3149 }
3150#ifdef CONFIG_IPV6_PRIVACY
3151 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3152 !(ifp->flags&IFA_F_TENTATIVE)) {
3153 if (age >= ifp->prefered_lft - regen_advance) {
3154 struct inet6_ifaddr *ifpub = ifp->ifpub;
3155 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3156 next = ifp->tstamp + ifp->prefered_lft * HZ;
3157 if (!ifp->regen_count && ifpub) {
3158 ifp->regen_count++;
3159 in6_ifa_hold(ifp);
3160 in6_ifa_hold(ifpub);
3161 spin_unlock(&ifp->lock);
5d5780df 3162 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3163 spin_lock(&ifpub->lock);
3164 ifpub->regen_count = 0;
3165 spin_unlock(&ifpub->lock);
1da177e4
LT		 3166 ipv6_create_tempaddr(ifpub, ifp);
3167 in6_ifa_put(ifpub);
3168 in6_ifa_put(ifp);
3169 goto restart;
3170 }
3171 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3172 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3173 spin_unlock(&ifp->lock);
3174#endif
3175 } else {
3176 /* ifp->prefered_lft <= ifp->valid_lft */
3177 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3178 next = ifp->tstamp + ifp->prefered_lft * HZ;
3179 spin_unlock(&ifp->lock);
3180 }
3181 }
5d5780df 3182 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3183 }
3184
3185 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3186 add_timer(&addr_chk_timer);
3187 spin_unlock_bh(&addrconf_verify_lock);
3188}
3189
461d8837
TG		 3190static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3191{
3192 struct in6_addr *pfx = NULL;
3193
3194 if (addr)
3195 pfx = nla_data(addr);
3196
3197 if (local) {
3198 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3199 pfx = NULL;
3200 else
3201 pfx = nla_data(local);
3202 }
3203
3204 return pfx;
3205}
3206
ef7c79ed 3207static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3208 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3209 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3210 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3211};
3212
1da177e4
LT		 3213static int
3214inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3215{
3b1e0a65 3216 struct net *net = sock_net(skb->sk);
b933f716
TG		 3217 struct ifaddrmsg *ifm;
3218 struct nlattr *tb[IFA_MAX+1];
1da177e4 3219 struct in6_addr *pfx;
b933f716 3220 int err;
1da177e4 3221
b933f716
TG		 3222 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3223 if (err < 0)
3224 return err;
3225
3226 ifm = nlmsg_data(nlh);
3227 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3228 if (pfx == NULL)
3229 return -EINVAL;
3230
af284937 3231 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3232}
3233
55ebaef1
NT		 3234static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3235 u32 prefered_lft, u32 valid_lft)
081bba5b 3236{
6f704992
YH		 3237 u32 flags;
3238 clock_t expires;
4bed72e4 3239 unsigned long timeout;
46d48046 3240
081bba5b
NT		 3241 if (!valid_lft || (prefered_lft > valid_lft))
3242 return -EINVAL;
3243
4bed72e4
YH		 3244 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3245 if (addrconf_finite_timeout(timeout)) {
3246 expires = jiffies_to_clock_t(timeout * HZ);
3247 valid_lft = timeout;
6f704992 3248 flags = RTF_EXPIRES;
4bed72e4
YH		 3249 } else {
3250 expires = 0;
3251 flags = 0;
3252 ifa_flags |= IFA_F_PERMANENT;
6f704992 3253 }
081bba5b 3254
4bed72e4
YH		 3255 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3256 if (addrconf_finite_timeout(timeout)) {
3257 if (timeout == 0)
3258 ifa_flags |= IFA_F_DEPRECATED;
3259 prefered_lft = timeout;
3260 }
081bba5b
NT		 3261
3262 spin_lock_bh(&ifp->lock);
3b9f9a1c 3263 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3264 ifp->tstamp = jiffies;
3265 ifp->valid_lft = valid_lft;
3266 ifp->prefered_lft = prefered_lft;
3267
3268 spin_unlock_bh(&ifp->lock);
3269 if (!(ifp->flags&IFA_F_TENTATIVE))
3270 ipv6_ifa_notify(0, ifp);
081bba5b 3271
46d48046 3272 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3273 expires, flags);
081bba5b
NT		 3274 addrconf_verify(0);
3275
3276 return 0;
3277}
3278
1da177e4
LT		 3279static int
3280inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3281{
3b1e0a65 3282 struct net *net = sock_net(skb->sk);
461d8837
TG		 3283 struct ifaddrmsg *ifm;
3284 struct nlattr *tb[IFA_MAX+1];
1da177e4 3285 struct in6_addr *pfx;
7198f8ce
TG		 3286 struct inet6_ifaddr *ifa;
3287 struct net_device *dev;
55ebaef1
NT		 3288 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3289 u8 ifa_flags;
461d8837 3290 int err;
1da177e4 3291
461d8837
TG		 3292 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3293 if (err < 0)
3294 return err;
3295
3296 ifm = nlmsg_data(nlh);
3297 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3298 if (pfx == NULL)
3299 return -EINVAL;
3300
461d8837 3301 if (tb[IFA_CACHEINFO]) {
0778769d 3302 struct ifa_cacheinfo *ci;
461d8837
TG		 3303
3304 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3305 valid_lft = ci->ifa_valid;
461d8837
TG		 3306 preferred_lft = ci->ifa_prefered;
3307 } else {
3308 preferred_lft = INFINITY_LIFE_TIME;
3309 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3310 }
3311
af284937 3312 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3313 if (dev == NULL)
3314 return -ENODEV;
3315
55ebaef1 3316 /* We ignore other flags so far. */
3b9f9a1c 3317 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3318
1cab3da6 3319 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3320 if (ifa == NULL) {
3321 /*
3322 * It would be best to check for !NLM_F_CREATE here but
3323 * userspace alreay relies on not having to provide this.
3324 */
af284937
DL		 3325 return inet6_addr_add(net, ifm->ifa_index, pfx,
3326 ifm->ifa_prefixlen, ifa_flags,
3327 preferred_lft, valid_lft);
081bba5b
NT		 3328 }
3329
7198f8ce
TG		 3330 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3331 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3332 err = -EEXIST;
3333 else
55ebaef1 3334 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3335
3336 in6_ifa_put(ifa);
3337
3338 return err;
1da177e4
LT		 3339}
3340
101bb229
TG		 3341static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3342 u8 scope, int ifindex)
3343{
3344 struct ifaddrmsg *ifm;
3345
3346 ifm = nlmsg_data(nlh);
3347 ifm->ifa_family = AF_INET6;
3348 ifm->ifa_prefixlen = prefixlen;
3349 ifm->ifa_flags = flags;
3350 ifm->ifa_scope = scope;
3351 ifm->ifa_index = ifindex;
3352}
3353
85486af0
TG		 3354static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3355 unsigned long tstamp, u32 preferred, u32 valid)
3356{
3357 struct ifa_cacheinfo ci;
3358
3359 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3360 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3361 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3362 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3363 ci.ifa_prefered = preferred;
3364 ci.ifa_valid = valid;
3365
3366 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3367}
3368
101bb229
TG		 3369static inline int rt_scope(int ifa_scope)
3370{
3371 if (ifa_scope & IFA_HOST)
3372 return RT_SCOPE_HOST;
3373 else if (ifa_scope & IFA_LINK)
3374 return RT_SCOPE_LINK;
3375 else if (ifa_scope & IFA_SITE)
3376 return RT_SCOPE_SITE;
3377 else
3378 return RT_SCOPE_UNIVERSE;
3379}
3380
0ab6803b
TG		 3381static inline int inet6_ifaddr_msgsize(void)
3382{
339bf98f
TG		 3383 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3384 + nla_total_size(16) /* IFA_ADDRESS */
3385 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3386}
c5396a31 3387
1da177e4 3388static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3389 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3390{
1da177e4 3391 struct nlmsghdr *nlh;
85486af0 3392 u32 preferred, valid;
1da177e4 3393
0ab6803b
TG		 3394 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3395 if (nlh == NULL)
26932566 3396 return -EMSGSIZE;
0ab6803b 3397
101bb229
TG		 3398 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3399 ifa->idev->dev->ifindex);
3400
1da177e4 3401 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3402 preferred = ifa->prefered_lft;
3403 valid = ifa->valid_lft;
3404 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3405 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3406 preferred -= tval;
3407 if (valid != INFINITY_LIFE_TIME)
3408 valid -= tval;
1da177e4
LT		 3409 }
3410 } else {
85486af0
TG		 3411 preferred = INFINITY_LIFE_TIME;
3412 valid = INFINITY_LIFE_TIME;
3413 }
3414
0ab6803b 3415 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3416 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3417 nlmsg_cancel(skb, nlh);
3418 return -EMSGSIZE;
3419 }
1da177e4 3420
0ab6803b 3421 return nlmsg_end(skb, nlh);
1da177e4
LT		 3422}
3423
3424static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3425 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3426{
1da177e4 3427 struct nlmsghdr *nlh;
101bb229
TG		 3428 u8 scope = RT_SCOPE_UNIVERSE;
3429 int ifindex = ifmca->idev->dev->ifindex;
3430
3431 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3432 scope = RT_SCOPE_SITE;
1da177e4 3433
0ab6803b
TG		 3434 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3435 if (nlh == NULL)
26932566 3436 return -EMSGSIZE;
85486af0 3437
0ab6803b
TG		 3438 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3439 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3440 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3441 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3442 nlmsg_cancel(skb, nlh);
3443 return -EMSGSIZE;
3444 }
85486af0 3445
0ab6803b 3446 return nlmsg_end(skb, nlh);
1da177e4
LT		 3447}
3448
3449static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3450 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3451{
1da177e4 3452 struct nlmsghdr *nlh;
101bb229
TG		 3453 u8 scope = RT_SCOPE_UNIVERSE;
3454 int ifindex = ifaca->aca_idev->dev->ifindex;
3455
3456 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3457 scope = RT_SCOPE_SITE;
1da177e4 3458
0ab6803b
TG		 3459 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3460 if (nlh == NULL)
26932566 3461 return -EMSGSIZE;
85486af0 3462
0ab6803b
TG		 3463 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3464 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3465 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3466 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3467 nlmsg_cancel(skb, nlh);
3468 return -EMSGSIZE;
3469 }
1da177e4 3470
0ab6803b 3471 return nlmsg_end(skb, nlh);
1da177e4
LT		 3472}
3473
3474enum addr_type_t
3475{
3476 UNICAST_ADDR,
3477 MULTICAST_ADDR,
3478 ANYCAST_ADDR,
3479};
3480
3481static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3482 enum addr_type_t type)
3483{
3484 int idx, ip_idx;
3485 int s_idx, s_ip_idx;
3486 int err = 1;
3487 struct net_device *dev;
3488 struct inet6_dev *idev = NULL;
3489 struct inet6_ifaddr *ifa;
3490 struct ifmcaddr6 *ifmca;
3491 struct ifacaddr6 *ifaca;
3b1e0a65 3492 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3493
3494 s_idx = cb->args[0];
3495 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3496
7562f876 3497 idx = 0;
6fda7350 3498 for_each_netdev(net, dev) {
1da177e4 3499 if (idx < s_idx)
7562f876 3500 goto cont;
1da177e4
LT		 3501 if (idx > s_idx)
3502 s_ip_idx = 0;
3503 ip_idx = 0;
3504 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3505 goto cont;
1da177e4
LT		 3506 read_lock_bh(&idev->lock);
3507 switch (type) {
3508 case UNICAST_ADDR:
ae9cda5d 3509 /* unicast address incl. temp addr */
1da177e4
LT		 3510 for (ifa = idev->addr_list; ifa;
3511 ifa = ifa->if_next, ip_idx++) {
3512 if (ip_idx < s_ip_idx)
3513 continue;
5d5619b4
YH		 3514 err = inet6_fill_ifaddr(skb, ifa,
3515 NETLINK_CB(cb->skb).pid,
3516 cb->nlh->nlmsg_seq,
3517 RTM_NEWADDR,
3518 NLM_F_MULTI);
1da177e4 3519 }
1da177e4
LT		 3520 break;
3521 case MULTICAST_ADDR:
3522 /* multicast address */
1ab1457c 3523 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3524 ifmca = ifmca->next, ip_idx++) {
3525 if (ip_idx < s_ip_idx)
3526 continue;
5d5619b4
YH		 3527 err = inet6_fill_ifmcaddr(skb, ifmca,
3528 NETLINK_CB(cb->skb).pid,
3529 cb->nlh->nlmsg_seq,
3530 RTM_GETMULTICAST,
3531 NLM_F_MULTI);
1da177e4
LT		 3532 }
3533 break;
3534 case ANYCAST_ADDR:
3535 /* anycast address */
3536 for (ifaca = idev->ac_list; ifaca;
3537 ifaca = ifaca->aca_next, ip_idx++) {
3538 if (ip_idx < s_ip_idx)
3539 continue;
5d5619b4
YH		 3540 err = inet6_fill_ifacaddr(skb, ifaca,
3541 NETLINK_CB(cb->skb).pid,
3542 cb->nlh->nlmsg_seq,
3543 RTM_GETANYCAST,
3544 NLM_F_MULTI);
1da177e4
LT		 3545 }
3546 break;
3547 default:
3548 break;
3549 }
3550 read_unlock_bh(&idev->lock);
3551 in6_dev_put(idev);
5d5619b4
YH		 3552
3553 if (err <= 0)
3554 break;
7562f876
PE		 3555cont:
3556 idx++;
1da177e4 3557 }
1da177e4
LT		 3558 cb->args[0] = idx;
3559 cb->args[1] = ip_idx;
3560 return skb->len;
3561}
3562
3563static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3564{
3565 enum addr_type_t type = UNICAST_ADDR;
b854272b 3566
1da177e4
LT		 3567 return inet6_dump_addr(skb, cb, type);
3568}
3569
3570static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3571{
3572 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3573
1da177e4
LT		 3574 return inet6_dump_addr(skb, cb, type);
3575}
3576
3577
3578static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3579{
3580 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3581
1da177e4
LT		 3582 return inet6_dump_addr(skb, cb, type);
3583}
3584
1b29fc2c
TG		 3585static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3586 void *arg)
6c223828 3587{
3b1e0a65 3588 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3589 struct ifaddrmsg *ifm;
3590 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3591 struct in6_addr *addr = NULL;
3592 struct net_device *dev = NULL;
3593 struct inet6_ifaddr *ifa;
3594 struct sk_buff *skb;
6c223828
NT		 3595 int err;
3596
1b29fc2c
TG		 3597 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3598 if (err < 0)
3599 goto errout;
3600
3601 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3602 if (addr == NULL) {
3603 err = -EINVAL;
3604 goto errout;
6c223828 3605 }
6c223828 3606
1b29fc2c 3607 ifm = nlmsg_data(nlh);
6c223828 3608 if (ifm->ifa_index)
6fda7350 3609 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3610
1cab3da6 3611 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3612 err = -EADDRNOTAVAIL;
3613 goto errout;
3614 }
6c223828 3615
0ab6803b 3616 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3617 err = -ENOBUFS;
1b29fc2c 3618 goto errout_ifa;
6c223828
NT		 3619 }
3620
6c223828
NT		 3621 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3622 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3623 if (err < 0) {
3624 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3625 WARN_ON(err == -EMSGSIZE);
3626 kfree_skb(skb);
3627 goto errout_ifa;
3628 }
6fda7350 3629 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3630errout_ifa:
6c223828 3631 in6_ifa_put(ifa);
1b29fc2c 3632errout:
6c223828 3633 return err;
6c223828
NT		 3634}
3635
1da177e4
LT		 3636static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3637{
3638 struct sk_buff *skb;
c346dca1 3639 struct net *net = dev_net(ifa->idev->dev);
5d620266 3640 int err = -ENOBUFS;
1da177e4 3641
0ab6803b 3642 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3643 if (skb == NULL)
3644 goto errout;
3645
3646 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3647 if (err < 0) {
3648 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3649 WARN_ON(err == -EMSGSIZE);
3650 kfree_skb(skb);
3651 goto errout;
3652 }
6fda7350 3653 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3654errout:
3655 if (err < 0)
6fda7350 3656 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3657}
3658
b6f99a21 3659static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3660 __s32 *array, int bytes)
3661{
04561c1f
TG		 3662 BUG_ON(bytes < (DEVCONF_MAX * 4));
3663
1da177e4
LT		 3664 memset(array, 0, bytes);
3665 array[DEVCONF_FORWARDING] = cnf->forwarding;
3666 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3667 array[DEVCONF_MTU6] = cnf->mtu6;
3668 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3669 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3670 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3671 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3672 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3673 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3674 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3675 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3676#ifdef CONFIG_IPV6_PRIVACY
3677 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3678 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3679 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3680 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3681 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3682#endif
3683 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3684 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3685 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3686#ifdef CONFIG_IPV6_ROUTER_PREF
3687 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3688 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3689#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3690 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3691#endif
930d6ff2 3692#endif
fbea49e1 3693 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3694 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3695#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3696 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3697#endif
7bc570c8
YH		 3698#ifdef CONFIG_IPV6_MROUTE
3699 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3700#endif
778d80be 3701 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3702 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
1da177e4
LT		 3703}
3704
339bf98f
TG		 3705static inline size_t inet6_if_nlmsg_size(void)
3706{
3707 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3708 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3709 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3710 + nla_total_size(4) /* IFLA_MTU */
3711 + nla_total_size(4) /* IFLA_LINK */
3712 + nla_total_size( /* IFLA_PROTINFO */
3713 nla_total_size(4) /* IFLA_INET6_FLAGS */
3714 + nla_total_size(sizeof(struct ifla_cacheinfo))
3715 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3716 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3717 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3718 );
3719}
c5396a31 3720
7f7d9a6b
HX		 3721static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3722 int bytes)
3723{
3724 int i;
3725 int pad = bytes - sizeof(u64) * items;
3726 BUG_ON(pad < 0);
3727
3728 /* Use put_unaligned() because stats may not be aligned for u64. */
3729 put_unaligned(items, &stats[0]);
3730 for (i = 1; i < items; i++)
3731 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3732
3733 memset(&stats[items], 0, pad);
3734}
3735
3736static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3737 int bytes)
3738{
3739 switch(attrtype) {
3740 case IFLA_INET6_STATS:
3741 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3742 break;
3743 case IFLA_INET6_ICMP6STATS:
3744 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3745 break;
3746 }
3747}
3748
1ab1457c 3749static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3750 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3751{
04561c1f 3752 struct net_device *dev = idev->dev;
bf99f1bd 3753 struct nlattr *nla;
04561c1f
TG		 3754 struct ifinfomsg *hdr;
3755 struct nlmsghdr *nlh;
3756 void *protoinfo;
3757 struct ifla_cacheinfo ci;
3758
3759 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3760 if (nlh == NULL)
26932566 3761 return -EMSGSIZE;
04561c1f
TG		 3762
3763 hdr = nlmsg_data(nlh);
3764 hdr->ifi_family = AF_INET6;
3765 hdr->__ifi_pad = 0;
3766 hdr->ifi_type = dev->type;
3767 hdr->ifi_index = dev->ifindex;
3768 hdr->ifi_flags = dev_get_flags(dev);
3769 hdr->ifi_change = 0;
3770
3771 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3772
3773 if (dev->addr_len)
04561c1f 3774 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3775
04561c1f 3776 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3777 if (dev->ifindex != dev->iflink)
04561c1f 3778 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3779
04561c1f
TG		 3780 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3781 if (protoinfo == NULL)
3782 goto nla_put_failure;
1da177e4 3783
04561c1f 3784 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3785
1da177e4
LT		 3786 ci.max_reasm_len = IPV6_MAXPLEN;
3787 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3788 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3789 ci.reachable_time = idev->nd_parms->reachable_time;
3790 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3791 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3792
bf99f1bd
YH		 3793 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3794 if (nla == NULL)
04561c1f 3795 goto nla_put_failure;
bf99f1bd 3796 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3797
bf99f1bd
YH		 3798 /* XXX - MC not implemented */
3799
3800 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3801 if (nla == NULL)
3802 goto nla_put_failure;
3803 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3804
3805 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3806 if (nla == NULL)
3807 goto nla_put_failure;
3808 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3809
04561c1f
TG		 3810 nla_nest_end(skb, protoinfo);
3811 return nlmsg_end(skb, nlh);
1da177e4 3812
04561c1f 3813nla_put_failure:
26932566
PM		 3814 nlmsg_cancel(skb, nlh);
3815 return -EMSGSIZE;
1da177e4
LT		 3816}
3817
3818static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3819{
3b1e0a65 3820 struct net *net = sock_net(skb->sk);
1da177e4
LT		 3821 int idx, err;
3822 int s_idx = cb->args[0];
3823 struct net_device *dev;
3824 struct inet6_dev *idev;
3825
3826 read_lock(&dev_base_lock);
7562f876 3827 idx = 0;
6fda7350 3828 for_each_netdev(net, dev) {
1da177e4 3829 if (idx < s_idx)
7562f876 3830 goto cont;
1da177e4 3831 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3832 goto cont;
1ab1457c 3833 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3834 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3835 in6_dev_put(idev);
3836 if (err <= 0)
3837 break;
7562f876
PE		 3838cont:
3839 idx++;
1da177e4
LT		 3840 }
3841 read_unlock(&dev_base_lock);
3842 cb->args[0] = idx;
3843
3844 return skb->len;
3845}
3846
3847void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3848{
3849 struct sk_buff *skb;
c346dca1 3850 struct net *net = dev_net(idev->dev);
8d7a76c9 3851 int err = -ENOBUFS;
1ab1457c 3852
339bf98f 3853 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3854 if (skb == NULL)
3855 goto errout;
3856
3857 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3858 if (err < 0) {
3859 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3860 WARN_ON(err == -EMSGSIZE);
3861 kfree_skb(skb);
3862 goto errout;
3863 }
6fda7350 3864 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3865errout:
3866 if (err < 0)
6fda7350 3867 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3868}
3869
339bf98f
TG		 3870static inline size_t inet6_prefix_nlmsg_size(void)
3871{
3872 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3873 + nla_total_size(sizeof(struct in6_addr))
3874 + nla_total_size(sizeof(struct prefix_cacheinfo));
3875}
c5396a31 3876
1da177e4 3877static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3878 struct prefix_info *pinfo, u32 pid, u32 seq,
3879 int event, unsigned int flags)
1da177e4 3880{
6051e2f4
TG		 3881 struct prefixmsg *pmsg;
3882 struct nlmsghdr *nlh;
1da177e4
LT		 3883 struct prefix_cacheinfo ci;
3884
6051e2f4
TG		 3885 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3886 if (nlh == NULL)
26932566 3887 return -EMSGSIZE;
6051e2f4
TG		 3888
3889 pmsg = nlmsg_data(nlh);
1da177e4 3890 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3891 pmsg->prefix_pad1 = 0;
3892 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3893 pmsg->prefix_ifindex = idev->dev->ifindex;
3894 pmsg->prefix_len = pinfo->prefix_len;
3895 pmsg->prefix_type = pinfo->type;
8a47077a 3896 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3897 pmsg->prefix_flags = 0;
3898 if (pinfo->onlink)
3899 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3900 if (pinfo->autoconf)
3901 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3902
6051e2f4 3903 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3904
3905 ci.preferred_time = ntohl(pinfo->prefered);
3906 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3907 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3908
6051e2f4 3909 return nlmsg_end(skb, nlh);
1da177e4 3910
6051e2f4 3911nla_put_failure:
26932566
PM		 3912 nlmsg_cancel(skb, nlh);
3913 return -EMSGSIZE;
1da177e4
LT		 3914}
3915
1ab1457c 3916static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3917 struct prefix_info *pinfo)
3918{
3919 struct sk_buff *skb;
c346dca1 3920 struct net *net = dev_net(idev->dev);
8c384bfa 3921 int err = -ENOBUFS;
1da177e4 3922
339bf98f 3923 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3924 if (skb == NULL)
3925 goto errout;
3926
3927 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3928 if (err < 0) {
3929 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3930 WARN_ON(err == -EMSGSIZE);
3931 kfree_skb(skb);
3932 goto errout;
3933 }
6fda7350 3934 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3935errout:
3936 if (err < 0)
6fda7350 3937 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3938}
3939
1da177e4
LT		 3940static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3941{
3942 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3943
3944 switch (event) {
3945 case RTM_NEWADDR:
95c385b4
NH		 3946 /*
3947 * If the address was optimistic
3948 * we inserted the route at the start of
3949 * our DAD process, so we don't need
3950 * to do it again
3951 */
3952 if (!(ifp->rt->rt6i_node))
3953 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3954 if (ifp->idev->cnf.forwarding)
3955 addrconf_join_anycast(ifp);
3956 break;
3957 case RTM_DELADDR:
3958 if (ifp->idev->cnf.forwarding)
3959 addrconf_leave_anycast(ifp);
3960 addrconf_leave_solict(ifp->idev, &ifp->addr);
3961 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3962 if (ip6_del_rt(ifp->rt))
1da177e4 3963 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3964 break;
3965 }
3966}
3967
3968static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3969{
8814c4b5 3970 rcu_read_lock_bh();
1da177e4
LT		 3971 if (likely(ifp->idev->dead == 0))
3972 __ipv6_ifa_notify(event, ifp);
8814c4b5 3973 rcu_read_unlock_bh();
1da177e4
LT		 3974}
3975
3976#ifdef CONFIG_SYSCTL
3977
3978static
3979int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3980 void __user *buffer, size_t *lenp, loff_t *ppos)
3981{
3982 int *valp = ctl->data;
3983 int val = *valp;
3984 int ret;
3985
3986 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3987
c8fecf22 3988 if (write)
b325fddb 3989 ret = addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3990 return ret;
1da177e4
LT		 3991}
3992
1ab1457c 3993static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3994 void __user *oldval,
3995 size_t __user *oldlenp,
1f29bcd7 3996 void __user *newval, size_t newlen)
1da177e4
LT		 3997{
3998 int *valp = table->data;
c8fecf22 3999 int val = *valp;
1da177e4
LT		 4000 int new;
4001
4002 if (!newval || !newlen)
4003 return 0;
4004 if (newlen != sizeof(int))
4005 return -EINVAL;
4006 if (get_user(new, (int __user *)newval))
4007 return -EFAULT;
4008 if (new == *valp)
4009 return 0;
4010 if (oldval && oldlenp) {
4011 size_t len;
4012 if (get_user(len, oldlenp))
4013 return -EFAULT;
4014 if (len) {
4015 if (len > table->maxlen)
4016 len = table->maxlen;
4017 if (copy_to_user(oldval, valp, len))
4018 return -EFAULT;
4019 if (put_user(len, oldlenp))
4020 return -EFAULT;
4021 }
4022 }
4023
c8fecf22 4024 *valp = new;
b325fddb 4025 return addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 4026}
4027
4028static struct addrconf_sysctl_table
4029{
4030 struct ctl_table_header *sysctl_header;
f6a07b29 4031 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4032 char *dev_name;
ab32ea5d 4033} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4034 .sysctl_header = NULL,
4035 .addrconf_vars = {
1ab1457c 4036 {
1da177e4
LT		 4037 .ctl_name = NET_IPV6_FORWARDING,
4038 .procname = "forwarding",
1ab1457c 4039 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4040 .maxlen = sizeof(int),
4041 .mode = 0644,
6d9f239a
AD		 4042 .proc_handler = addrconf_sysctl_forward,
4043 .strategy = addrconf_sysctl_forward_strategy,
1da177e4
LT		 4044 },
4045 {
4046 .ctl_name = NET_IPV6_HOP_LIMIT,
4047 .procname = "hop_limit",
1ab1457c 4048 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4049 .maxlen = sizeof(int),
4050 .mode = 0644,
4051 .proc_handler = proc_dointvec,
4052 },
4053 {
4054 .ctl_name = NET_IPV6_MTU,
4055 .procname = "mtu",
4056 .data = &ipv6_devconf.mtu6,
1ab1457c 4057 .maxlen = sizeof(int),
1da177e4 4058 .mode = 0644,
6d9f239a 4059 .proc_handler = proc_dointvec,
1da177e4
LT		 4060 },
4061 {
4062 .ctl_name = NET_IPV6_ACCEPT_RA,
4063 .procname = "accept_ra",
1ab1457c 4064 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4065 .maxlen = sizeof(int),
4066 .mode = 0644,
6d9f239a 4067 .proc_handler = proc_dointvec,
1da177e4
LT		 4068 },
4069 {
4070 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4071 .procname = "accept_redirects",
1ab1457c 4072 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4073 .maxlen = sizeof(int),
4074 .mode = 0644,
6d9f239a 4075 .proc_handler = proc_dointvec,
1da177e4
LT		 4076 },
4077 {
4078 .ctl_name = NET_IPV6_AUTOCONF,
4079 .procname = "autoconf",
1ab1457c 4080 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4081 .maxlen = sizeof(int),
4082 .mode = 0644,
6d9f239a 4083 .proc_handler = proc_dointvec,
1da177e4
LT		 4084 },
4085 {
4086 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4087 .procname = "dad_transmits",
1ab1457c 4088 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4089 .maxlen = sizeof(int),
4090 .mode = 0644,
6d9f239a 4091 .proc_handler = proc_dointvec,
1da177e4
LT		 4092 },
4093 {
4094 .ctl_name = NET_IPV6_RTR_SOLICITS,
4095 .procname = "router_solicitations",
1ab1457c 4096 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4097 .maxlen = sizeof(int),
4098 .mode = 0644,
6d9f239a 4099 .proc_handler = proc_dointvec,
1da177e4
LT		 4100 },
4101 {
4102 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4103 .procname = "router_solicitation_interval",
1ab1457c 4104 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4105 .maxlen = sizeof(int),
4106 .mode = 0644,
6d9f239a
AD		 4107 .proc_handler = proc_dointvec_jiffies,
4108 .strategy = sysctl_jiffies,
1da177e4
LT		 4109 },
4110 {
4111 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4112 .procname = "router_solicitation_delay",
1ab1457c 4113 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4114 .maxlen = sizeof(int),
4115 .mode = 0644,
6d9f239a
AD		 4116 .proc_handler = proc_dointvec_jiffies,
4117 .strategy = sysctl_jiffies,
1da177e4
LT		 4118 },
4119 {
4120 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4121 .procname = "force_mld_version",
1ab1457c 4122 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4123 .maxlen = sizeof(int),
4124 .mode = 0644,
6d9f239a 4125 .proc_handler = proc_dointvec,
1da177e4
LT		 4126 },
4127#ifdef CONFIG_IPV6_PRIVACY
4128 {
4129 .ctl_name = NET_IPV6_USE_TEMPADDR,
4130 .procname = "use_tempaddr",
1ab1457c 4131 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4132 .maxlen = sizeof(int),
4133 .mode = 0644,
6d9f239a 4134 .proc_handler = proc_dointvec,
1da177e4
LT		 4135 },
4136 {
4137 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4138 .procname = "temp_valid_lft",
1ab1457c 4139 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4140 .maxlen = sizeof(int),
4141 .mode = 0644,
6d9f239a 4142 .proc_handler = proc_dointvec,
1da177e4
LT		 4143 },
4144 {
4145 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4146 .procname = "temp_prefered_lft",
1ab1457c 4147 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4148 .maxlen = sizeof(int),
4149 .mode = 0644,
6d9f239a 4150 .proc_handler = proc_dointvec,
1da177e4
LT		 4151 },
4152 {
4153 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4154 .procname = "regen_max_retry",
1ab1457c 4155 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4156 .maxlen = sizeof(int),
4157 .mode = 0644,
6d9f239a 4158 .proc_handler = proc_dointvec,
1da177e4
LT		 4159 },
4160 {
4161 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4162 .procname = "max_desync_factor",
1ab1457c 4163 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4164 .maxlen = sizeof(int),
4165 .mode = 0644,
6d9f239a 4166 .proc_handler = proc_dointvec,
1da177e4
LT		 4167 },
4168#endif
4169 {
4170 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4171 .procname = "max_addresses",
4172 .data = &ipv6_devconf.max_addresses,
4173 .maxlen = sizeof(int),
4174 .mode = 0644,
6d9f239a 4175 .proc_handler = proc_dointvec,
1da177e4 4176 },
65f5c7c1
YH		 4177 {
4178 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4179 .procname = "accept_ra_defrtr",
1ab1457c 4180 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4181 .maxlen = sizeof(int),
4182 .mode = 0644,
6d9f239a 4183 .proc_handler = proc_dointvec,
65f5c7c1 4184 },
c4fd30eb
YH		 4185 {
4186 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4187 .procname = "accept_ra_pinfo",
1ab1457c 4188 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4189 .maxlen = sizeof(int),
4190 .mode = 0644,
6d9f239a 4191 .proc_handler = proc_dointvec,
c4fd30eb 4192 },
930d6ff2
YH		 4193#ifdef CONFIG_IPV6_ROUTER_PREF
4194 {
4195 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4196 .procname = "accept_ra_rtr_pref",
4197 .data = &ipv6_devconf.accept_ra_rtr_pref,
4198 .maxlen = sizeof(int),
4199 .mode = 0644,
6d9f239a 4200 .proc_handler = proc_dointvec,
930d6ff2 4201 },
52e16356
YH		 4202 {
4203 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4204 .procname = "router_probe_interval",
4205 .data = &ipv6_devconf.rtr_probe_interval,
4206 .maxlen = sizeof(int),
4207 .mode = 0644,
6d9f239a
AD		 4208 .proc_handler = proc_dointvec_jiffies,
4209 .strategy = sysctl_jiffies,
52e16356 4210 },
fa03ef38 4211#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4212 {
4213 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4214 .procname = "accept_ra_rt_info_max_plen",
4215 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4216 .maxlen = sizeof(int),
4217 .mode = 0644,
6d9f239a 4218 .proc_handler = proc_dointvec,
09c884d4
YH		 4219 },
4220#endif
930d6ff2 4221#endif
fbea49e1
YH		 4222 {
4223 .ctl_name = NET_IPV6_PROXY_NDP,
4224 .procname = "proxy_ndp",
4225 .data = &ipv6_devconf.proxy_ndp,
4226 .maxlen = sizeof(int),
4227 .mode = 0644,
6d9f239a 4228 .proc_handler = proc_dointvec,
fbea49e1 4229 },
0bcbc926
YH		 4230 {
4231 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4232 .procname = "accept_source_route",
4233 .data = &ipv6_devconf.accept_source_route,
4234 .maxlen = sizeof(int),
4235 .mode = 0644,
6d9f239a 4236 .proc_handler = proc_dointvec,
0bcbc926 4237 },
95c385b4
NH		 4238#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4239 {
4240 .ctl_name = CTL_UNNUMBERED,
4241 .procname = "optimistic_dad",
4242 .data = &ipv6_devconf.optimistic_dad,
4243 .maxlen = sizeof(int),
4244 .mode = 0644,
6d9f239a 4245 .proc_handler = proc_dointvec,
95c385b4
NH		 4246
4247 },
7bc570c8
YH		 4248#endif
4249#ifdef CONFIG_IPV6_MROUTE
4250 {
4251 .ctl_name = CTL_UNNUMBERED,
4252 .procname = "mc_forwarding",
4253 .data = &ipv6_devconf.mc_forwarding,
4254 .maxlen = sizeof(int),
a4e6db07 4255 .mode = 0444,
6d9f239a 4256 .proc_handler = proc_dointvec,
7bc570c8 4257 },
95c385b4 4258#endif
778d80be
YH		 4259 {
4260 .ctl_name = CTL_UNNUMBERED,
4261 .procname = "disable_ipv6",
4262 .data = &ipv6_devconf.disable_ipv6,
4263 .maxlen = sizeof(int),
4264 .mode = 0644,
6d9f239a 4265 .proc_handler = proc_dointvec,
778d80be 4266 },
1b34be74
YH		 4267 {
4268 .ctl_name = CTL_UNNUMBERED,
4269 .procname = "accept_dad",
4270 .data = &ipv6_devconf.accept_dad,
4271 .maxlen = sizeof(int),
4272 .mode = 0644,
6d9f239a 4273 .proc_handler = proc_dointvec,
1b34be74 4274 },
1da177e4
LT		 4275 {
4276 .ctl_name = 0, /* sentinel */
4277 }
4278 },
1da177e4
LT		 4279};
4280
bff16c2f
PE		 4281static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4282 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4283{
4284 int i;
1da177e4 4285 struct addrconf_sysctl_table *t;
1da177e4 4286
1dab6222
PE		 4287#define ADDRCONF_CTL_PATH_DEV 3
4288
4289 struct ctl_path addrconf_ctl_path[] = {
4290 { .procname = "net", .ctl_name = CTL_NET, },
4291 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4292 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4293 { /* to be set */ },
4294 { },
4295 };
4296
4297
af879cc7 4298 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4299 if (t == NULL)
f68635e6
PE		 4300 goto out;
4301
1da177e4
LT		 4302 for (i=0; t->addrconf_vars[i].data; i++) {
4303 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4304 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4305 t->addrconf_vars[i].extra2 = net;
1da177e4 4306 }
1da177e4 4307
1ab1457c
YH		 4308 /*
4309 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4310 * by sysctl and we wouldn't want anyone to change it under our feet
4311 * (see SIOCSIFNAME).
1ab1457c 4312 */
1dab6222
PE		 4313 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4314 if (!t->dev_name)
f68635e6 4315 goto free;
1da177e4 4316
1dab6222
PE		 4317 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4318 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4319
bff16c2f 4320 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4321 t->addrconf_vars);
1da177e4
LT		 4322 if (t->sysctl_header == NULL)
4323 goto free_procname;
f68635e6
PE		 4324
4325 p->sysctl = t;
95897312 4326 return 0;
1da177e4 4327
f68635e6 4328free_procname:
1dab6222 4329 kfree(t->dev_name);
f68635e6 4330free:
1da177e4 4331 kfree(t);
f68635e6 4332out:
95897312 4333 return -ENOBUFS;
1da177e4
LT		 4334}
4335
408c4768
PE		 4336static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4337{
4338 struct addrconf_sysctl_table *t;
4339
4340 if (p->sysctl == NULL)
4341 return;
4342
4343 t = p->sysctl;
4344 p->sysctl = NULL;
4345 unregister_sysctl_table(t->sysctl_header);
4346 kfree(t->dev_name);
4347 kfree(t);
4348}
4349
f52295a9
PE		 4350static void addrconf_sysctl_register(struct inet6_dev *idev)
4351{
408c4768
PE		 4352 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4353 NET_IPV6_NEIGH, "ipv6",
4354 &ndisc_ifinfo_sysctl_change,
0686caa3 4355 ndisc_ifinfo_sysctl_strategy);
c346dca1 4356 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
bff16c2f 4357 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4358}
4359
408c4768 4360static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4361{
408c4768
PE		 4362 __addrconf_sysctl_unregister(&idev->cnf);
4363 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4364}
4365
4366
4367#endif
4368
e0da5a48
PE		 4369static int addrconf_init_net(struct net *net)
4370{
4371 int err;
4372 struct ipv6_devconf *all, *dflt;
4373
4374 err = -ENOMEM;
4375 all = &ipv6_devconf;
4376 dflt = &ipv6_devconf_dflt;
4377
4378 if (net != &init_net) {
4379 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4380 if (all == NULL)
4381 goto err_alloc_all;
4382
4383 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4384 if (dflt == NULL)
4385 goto err_alloc_dflt;
4386 }
4387
4388 net->ipv6.devconf_all = all;
4389 net->ipv6.devconf_dflt = dflt;
4390
4391#ifdef CONFIG_SYSCTL
4392 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4393 NULL, all);
4394 if (err < 0)
4395 goto err_reg_all;
4396
4397 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4398 NULL, dflt);
4399 if (err < 0)
4400 goto err_reg_dflt;
4401#endif
4402 return 0;
4403
4404#ifdef CONFIG_SYSCTL
4405err_reg_dflt:
4406 __addrconf_sysctl_unregister(all);
4407err_reg_all:
4408 kfree(dflt);
4409#endif
4410err_alloc_dflt:
4411 kfree(all);
4412err_alloc_all:
4413 return err;
4414}
4415
4416static void addrconf_exit_net(struct net *net)
4417{
4418#ifdef CONFIG_SYSCTL
4419 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4420 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4421#endif
4422 if (net != &init_net) {
4423 kfree(net->ipv6.devconf_dflt);
4424 kfree(net->ipv6.devconf_all);
4425 }
4426}
4427
4428static struct pernet_operations addrconf_ops = {
4429 .init = addrconf_init_net,
4430 .exit = addrconf_exit_net,
4431};
4432
1da177e4
LT		 4433/*
4434 * Device notifier
4435 */
4436
4437int register_inet6addr_notifier(struct notifier_block *nb)
4438{
1ab1457c 4439 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4440}
4441
7159039a
YH		 4442EXPORT_SYMBOL(register_inet6addr_notifier);
4443
1da177e4
LT		 4444int unregister_inet6addr_notifier(struct notifier_block *nb)
4445{
1ab1457c 4446 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4447}
4448
7159039a
YH		 4449EXPORT_SYMBOL(unregister_inet6addr_notifier);
4450
af284937
DL		 4451static void addrconf_net_exit(struct net *net)
4452{
6fda7350
BT		 4453 struct net_device *dev;
4454
6fda7350
BT		 4455 rtnl_lock();
4456 /* clean dev list */
4457 for_each_netdev(net, dev) {
4458 if (__in6_dev_get(dev) == NULL)
4459 continue;
4460 addrconf_ifdown(dev, 1);
4461 }
4462 addrconf_ifdown(net->loopback_dev, 2);
4463 rtnl_unlock();
af284937
DL		 4464}
4465
4466static struct pernet_operations addrconf_net_ops = {
af284937
DL		 4467 .exit = addrconf_net_exit,
4468};
4469
1da177e4
LT		 4470/*
4471 * Init / cleanup code
4472 */
4473
4474int __init addrconf_init(void)
4475{
2a8cc6c8
YH		 4476 int err;
4477
4478 if ((err = ipv6_addr_label_init()) < 0) {
4479 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4480 err);
4481 return err;
4482 }
1da177e4 4483
e0da5a48
PE		 4484 register_pernet_subsys(&addrconf_ops);
4485
1da177e4
LT		 4486 /* The addrconf netdev notifier requires that loopback_dev
4487 * has it's ipv6 private information allocated and setup
4488 * before it can bring up and give link-local addresses
4489 * to other devices which are up.
4490 *
4491 * Unfortunately, loopback_dev is not necessarily the first
4492 * entry in the global dev_base list of net devices. In fact,
4493 * it is likely to be the very last entry on that list.
4494 * So this causes the notifier registry below to try and
4495 * give link-local addresses to all devices besides loopback_dev
4496 * first, then loopback_dev, which cases all the non-loopback_dev
4497 * devices to fail to get a link-local address.
4498 *
4499 * So, as a temporary fix, allocate the ipv6 structure for
4500 * loopback_dev first by hand.
4501 * Longer term, all of the dependencies ipv6 has upon the loopback
4502 * device and it being up should be removed.
4503 */
4504 rtnl_lock();
2774c7ab 4505 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4506 err = -ENOMEM;
4507 rtnl_unlock();
4508 if (err)
e0da5a48 4509 goto errlo;
1da177e4 4510
af284937
DL		 4511 err = register_pernet_device(&addrconf_net_ops);
4512 if (err)
4513 return err;
4514
1da177e4
LT		 4515 register_netdevice_notifier(&ipv6_dev_notf);
4516
1da177e4 4517 addrconf_verify(0);
c127ea2c
TG		 4518
4519 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4520 if (err < 0)
4521 goto errout;
4522
4523 /* Only the first call to __rtnl_register can fail */
4524 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4525 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4526 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4527 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4528 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4529
2a8cc6c8
YH		 4530 ipv6_addr_label_rtnl_register();
4531
1da177e4 4532 return 0;
c127ea2c
TG		 4533errout:
4534 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4535errlo:
4536 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4537
4538 return err;
1da177e4
LT		 4539}
4540
09f7709f 4541void addrconf_cleanup(void)
1da177e4 4542{
1ab1457c 4543 struct inet6_ifaddr *ifa;
1da177e4
LT		 4544 int i;
4545
4546 unregister_netdevice_notifier(&ipv6_dev_notf);
af284937 4547 unregister_pernet_device(&addrconf_net_ops);
1da177e4 4548
e0da5a48 4549 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4550
4551 rtnl_lock();
4552
1da177e4
LT		 4553 /*
4554 * Check hash table.
4555 */
1da177e4
LT		 4556 write_lock_bh(&addrconf_hash_lock);
4557 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4558 for (ifa=inet6_addr_lst[i]; ifa; ) {
4559 struct inet6_ifaddr *bifa;
4560
4561 bifa = ifa;
4562 ifa = ifa->lst_next;
4563 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4564 /* Do not free it; something is wrong.
4565 Now we can investigate it with debugger.
4566 */
4567 }
4568 }
4569 write_unlock_bh(&addrconf_hash_lock);
4570
4571 del_timer(&addr_chk_timer);
1da177e4 4572 rtnl_unlock();
af284937
DL		 4573
4574 unregister_pernet_subsys(&addrconf_net_ops);
1da177e4 4575}
kernel source for telekom puls (alcatel/mediatek)