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ipv6: Preserve pervious behavior in ipv6_link_dev_addr().
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#ifdef CONFIG_SYSCTL
57#include <linux/sysctl.h>
58#endif
4fc268d2 59#include <linux/capability.h>
1da177e4
LT		 60#include <linux/delay.h>
61#include <linux/notifier.h>
543537bd 62#include <linux/string.h>
1da177e4 63
457c4cbc 64#include <net/net_namespace.h>
1da177e4
LT		 65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
5d620266 75#include <net/netlink.h>
f24e3d65 76#include <net/pkt_sched.h>
1da177e4
LT		 77#include <linux/if_tunnel.h>
78#include <linux/rtnetlink.h>
79
80#ifdef CONFIG_IPV6_PRIVACY
81#include <linux/random.h>
1da177e4
LT		 82#endif
83
e21e8467 84#include <linux/uaccess.h>
7f7d9a6b 85#include <asm/unaligned.h>
1da177e4
LT		 86
87#include <linux/proc_fs.h>
88#include <linux/seq_file.h>
89
90/* Set to 3 to get tracing... */
91#define ACONF_DEBUG 2
92
93#if ACONF_DEBUG >= 3
94#define ADBG(x) printk x
95#else
96#define ADBG(x)
97#endif
98
99#define INFINITY_LIFE_TIME 0xFFFFFFFF
e21e8467 100#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 101
b2db7564
YH		 102#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
103#define ADDRCONF_TIMER_FUZZ (HZ / 4)
104#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
105
1da177e4 106#ifdef CONFIG_SYSCTL
f52295a9 107static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 108static void addrconf_sysctl_unregister(struct inet6_dev *idev);
109#else
110static inline void addrconf_sysctl_register(struct inet6_dev *idev)
111{
112}
113
114static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
115{
116}
1da177e4
LT		 117#endif
118
119#ifdef CONFIG_IPV6_PRIVACY
120static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 121static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 122static void ipv6_regen_rndid(unsigned long data);
123
124static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 125#endif
126
1b34be74 127static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 128static int ipv6_count_addresses(struct inet6_dev *idev);
129
130/*
131 * Configured unicast address hash table
132 */
c2e21293 133static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 134static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 135
1da177e4
LT		 136static void addrconf_verify(unsigned long);
137
8d06afab 138static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 139static DEFINE_SPINLOCK(addrconf_verify_lock);
140
141static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143
93d9b7d7
JP		 144static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
1da177e4
LT		 146static int addrconf_ifdown(struct net_device *dev, int how);
147
e431b8c0 148static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 149static void addrconf_dad_timer(unsigned long data);
150static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 151static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 152static void addrconf_rs_timer(unsigned long data);
153static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
154static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155
1ab1457c 156static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 157 struct prefix_info *pinfo);
3e81c6da
DM		 158static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
159 struct net_device *dev);
1da177e4 160
e041c683 161static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 162
888c848e 163static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 164 .forwarding = 0,
165 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
166 .mtu6 = IPV6_MIN_MTU,
167 .accept_ra = 1,
168 .accept_redirects = 1,
169 .autoconf = 1,
170 .force_mld_version = 0,
171 .dad_transmits = 1,
172 .rtr_solicits = MAX_RTR_SOLICITATIONS,
173 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
174 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
175#ifdef CONFIG_IPV6_PRIVACY
176 .use_tempaddr = 0,
177 .temp_valid_lft = TEMP_VALID_LIFETIME,
178 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
179 .regen_max_retry = REGEN_MAX_RETRY,
180 .max_desync_factor = MAX_DESYNC_FACTOR,
181#endif
182 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 183 .accept_ra_defrtr = 1,
c4fd30eb 184 .accept_ra_pinfo = 1,
930d6ff2
YH		 185#ifdef CONFIG_IPV6_ROUTER_PREF
186 .accept_ra_rtr_pref = 1,
52e16356 187 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 188#ifdef CONFIG_IPV6_ROUTE_INFO
189 .accept_ra_rt_info_max_plen = 0,
190#endif
930d6ff2 191#endif
fbea49e1 192 .proxy_ndp = 0,
0bcbc926 193 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 194 .disable_ipv6 = 0,
1b34be74 195 .accept_dad = 1,
1da177e4
LT		 196};
197
ab32ea5d 198static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .dad_transmits = 1,
206 .rtr_solicits = MAX_RTR_SOLICITATIONS,
207 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
208 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
209#ifdef CONFIG_IPV6_PRIVACY
210 .use_tempaddr = 0,
211 .temp_valid_lft = TEMP_VALID_LIFETIME,
212 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
213 .regen_max_retry = REGEN_MAX_RETRY,
214 .max_desync_factor = MAX_DESYNC_FACTOR,
215#endif
216 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 217 .accept_ra_defrtr = 1,
c4fd30eb 218 .accept_ra_pinfo = 1,
930d6ff2
YH		 219#ifdef CONFIG_IPV6_ROUTER_PREF
220 .accept_ra_rtr_pref = 1,
52e16356 221 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 222#ifdef CONFIG_IPV6_ROUTE_INFO
223 .accept_ra_rt_info_max_plen = 0,
224#endif
930d6ff2 225#endif
fbea49e1 226 .proxy_ndp = 0,
0bcbc926 227 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 228 .disable_ipv6 = 0,
1b34be74 229 .accept_dad = 1,
1da177e4
LT		 230};
231
232/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 233const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 234const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 235const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
236const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 237
f24e3d65 238/* Check if a valid qdisc is available */
05297949 239static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 240{
05297949 241 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 242}
243
2b5ead46
YH		 244/* Check if a route is valid prefix route */
245static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
246{
247 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
248}
249
1da177e4
LT		 250static void addrconf_del_timer(struct inet6_ifaddr *ifp)
251{
252 if (del_timer(&ifp->timer))
253 __in6_ifa_put(ifp);
254}
255
e21e8467 256enum addrconf_timer_t {
1da177e4
LT		 257 AC_NONE,
258 AC_DAD,
259 AC_RS,
260};
261
262static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
263 enum addrconf_timer_t what,
264 unsigned long when)
265{
266 if (!del_timer(&ifp->timer))
267 in6_ifa_hold(ifp);
268
269 switch (what) {
270 case AC_DAD:
271 ifp->timer.function = addrconf_dad_timer;
272 break;
273 case AC_RS:
274 ifp->timer.function = addrconf_rs_timer;
275 break;
e21e8467
SH		 276 default:
277 break;
1da177e4
LT		 278 }
279 ifp->timer.expires = jiffies + when;
280 add_timer(&ifp->timer);
281}
282
7f7d9a6b
HX		 283static int snmp6_alloc_dev(struct inet6_dev *idev)
284{
7d720c3e 285 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 286 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 287 goto err_ip;
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 289 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 290 goto err_icmp;
7d720c3e 291 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 292 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 293 goto err_icmpmsg;
7f7d9a6b
HX		 294
295 return 0;
296
14878f75 297err_icmpmsg:
7d720c3e 298 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 299err_icmp:
7d720c3e 300 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 301err_ip:
aaf70ec7 302 return -ENOMEM;
7f7d9a6b
HX		 303}
304
16910b98 305static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 306{
7d720c3e
TH		 307 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
308 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 310}
311
1da177e4
LT		 312/* Nobody refers to this device, we may destroy it. */
313
8814c4b5
YH		 314static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
315{
316 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
317 kfree(idev);
318}
319
1da177e4
LT		 320void in6_dev_finish_destroy(struct inet6_dev *idev)
321{
322 struct net_device *dev = idev->dev;
547b792c 323
502a2ffd 324 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 325 WARN_ON(idev->mc_list != NULL);
326
1da177e4
LT		 327#ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329#endif
330 dev_put(dev);
331 if (!idev->dead) {
e21e8467 332 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 333 return;
334 }
335 snmp6_free_dev(idev);
8814c4b5 336 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 337}
338
7159039a
YH		 339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
1da177e4
LT		 341static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342{
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
1ab1457c 350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 351
1ab1457c
YH		 352 if (ndev == NULL)
353 return NULL;
322f74a4
IO		 354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
502a2ffd 357 INIT_LIST_HEAD(&ndev->addr_list);
358
c346dca1 359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
0187bdfb
BH		 367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
322f74a4
IO		 369 /* We refer to the device */
370 dev_hold(dev);
1da177e4 371
322f74a4
IO		 372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 375 __func__, dev->name));
322f74a4
IO		 376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 ndev->dead = 1;
378 in6_dev_finish_destroy(ndev);
379 return NULL;
380 }
1da177e4 381
322f74a4
IO		 382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 385 __func__, dev->name));
322f74a4
IO		 386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
1da177e4 396
1b34be74
YH		 397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
b077d7ab
YH		 400#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407#endif
408
1da177e4 409#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 410 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
9625ed72 414 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 415 dev->type == ARPHRD_SIT ||
0be669bb 416 dev->type == ARPHRD_NONE) {
322f74a4
IO		 417 printk(KERN_INFO
418 "%s: Disabled Privacy Extensions\n",
419 dev->name);
420 ndev->cnf.use_tempaddr = -1;
421 } else {
422 in6_dev_hold(ndev);
423 ipv6_regen_rndid((unsigned long) ndev);
424 }
1da177e4
LT		 425#endif
426
f24e3d65 427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 428 ndev->if_flags |= IF_READY;
429
322f74a4
IO		 430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
f52295a9 432 addrconf_sysctl_register(ndev);
30c4cf57
DS		 433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 435
436 /* Join all-node multicast group */
f3ee4010 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 438
1da177e4
LT		 439 return ndev;
440}
441
cee89473 442static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 443{
444 struct inet6_dev *idev;
445
446 ASSERT_RTNL();
447
e21e8467
SH		 448 idev = __in6_dev_get(dev);
449 if (!idev) {
450 idev = ipv6_add_dev(dev);
451 if (!idev)
1da177e4
LT		 452 return NULL;
453 }
c5e33bdd 454
1da177e4
LT		 455 if (dev->flags&IFF_UP)
456 ipv6_mc_up(idev);
457 return idev;
458}
459
460#ifdef CONFIG_SYSCTL
461static void dev_forward_change(struct inet6_dev *idev)
462{
463 struct net_device *dev;
464 struct inet6_ifaddr *ifa;
1da177e4
LT		 465
466 if (!idev)
467 return;
468 dev = idev->dev;
0187bdfb
BH		 469 if (idev->cnf.forwarding)
470 dev_disable_lro(dev);
1da177e4 471 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 472 if (idev->cnf.forwarding)
f3ee4010 473 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 474 else
f3ee4010 475 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 476 }
502a2ffd 477
478 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 479 if (ifa->flags&IFA_F_TENTATIVE)
480 continue;
1da177e4
LT		 481 if (idev->cnf.forwarding)
482 addrconf_join_anycast(ifa);
483 else
484 addrconf_leave_anycast(ifa);
485 }
486}
487
488
e186932b 489static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 490{
491 struct net_device *dev;
492 struct inet6_dev *idev;
493
c6d14c84
ED		 494 rcu_read_lock();
495 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 496 idev = __in6_dev_get(dev);
497 if (idev) {
e186932b
PE		 498 int changed = (!idev->cnf.forwarding) ^ (!newf);
499 idev->cnf.forwarding = newf;
1da177e4
LT		 500 if (changed)
501 dev_forward_change(idev);
502 }
1da177e4 503 }
c6d14c84 504 rcu_read_unlock();
1da177e4 505}
c8fecf22 506
b325fddb 507static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 508{
bff16c2f
PE		 509 struct net *net;
510
511 net = (struct net *)table->extra2;
441fc2a2 512 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 513 return 0;
514
88af182e
EB		 515 if (!rtnl_trylock()) {
516 /* Restore the original values before restarting */
517 *p = old;
5007392d 518 return restart_syscall();
88af182e 519 }
c8fecf22 520
e186932b
PE		 521 if (p == &net->ipv6.devconf_all->forwarding) {
522 __s32 newf = net->ipv6.devconf_all->forwarding;
523 net->ipv6.devconf_dflt->forwarding = newf;
524 addrconf_forward_change(net, newf);
c8fecf22
PE		 525 } else if ((!*p) ^ (!old))
526 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 527 rtnl_unlock();
c8fecf22
PE		 528
529 if (*p)
7b4da532 530 rt6_purge_dflt_routers(net);
b325fddb 531 return 1;
c8fecf22 532}
1da177e4
LT		 533#endif
534
5c578aed 535static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
536{
537 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
538 kfree(ifp);
539}
1da177e4 540
5c578aed 541/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 542void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
543{
c2e21293 544 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 545
1da177e4
LT		 546#ifdef NET_REFCNT_DEBUG
547 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
548#endif
549
550 in6_dev_put(ifp->idev);
551
552 if (del_timer(&ifp->timer))
e21e8467 553 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4
LT		 554
555 if (!ifp->dead) {
e21e8467 556 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 557 return;
558 }
559 dst_release(&ifp->rt->u.dst);
560
5c578aed 561 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 562}
563
e55ffac6
BH		 564static void
565ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
566{
502a2ffd 567 struct list_head *p;
8a6ce0c0 568 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 569
570 /*
571 * Each device address list is sorted in order of scope -
572 * global before linklocal.
573 */
502a2ffd 574 list_for_each(p, &idev->addr_list) {
575 struct inet6_ifaddr *ifa
576 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 577 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 578 break;
579 }
580
b54c9b98 581 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 582}
583
3a88a81d 584static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 585{
3eb84f49
YH		 586 /*
587 * We perform the hash function over the last 64 bits of the address
588 * This will include the IEEE address token on links that support it.
589 */
3a88a81d 590 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
591 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 592}
593
1da177e4
LT		 594/* On success it returns ifp with increased reference count */
595
596static struct inet6_ifaddr *
597ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 598 int scope, u32 flags)
1da177e4
LT		 599{
600 struct inet6_ifaddr *ifa = NULL;
601 struct rt6_info *rt;
3a88a81d 602 unsigned int hash;
1da177e4 603 int err = 0;
d68b8270
YH		 604 int addr_type = ipv6_addr_type(addr);
605
606 if (addr_type == IPV6_ADDR_ANY ||
607 addr_type & IPV6_ADDR_MULTICAST ||
608 (!(idev->dev->flags & IFF_LOOPBACK) &&
609 addr_type & IPV6_ADDR_LOOPBACK))
610 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 611
8814c4b5 612 rcu_read_lock_bh();
1da177e4
LT		 613 if (idev->dead) {
614 err = -ENODEV; /*XXX*/
615 goto out2;
616 }
617
56d417b1 618 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 619 err = -EACCES;
620 goto out2;
621 }
622
5c578aed 623 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 624
625 /* Ignore adding duplicate addresses on an interface */
c346dca1 626 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 627 ADBG(("ipv6_add_addr: already assigned\n"));
628 err = -EEXIST;
629 goto out;
630 }
631
322f74a4 632 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 633
634 if (ifa == NULL) {
635 ADBG(("ipv6_add_addr: malloc failed\n"));
636 err = -ENOBUFS;
637 goto out;
638 }
639
640 rt = addrconf_dst_alloc(idev, addr, 0);
641 if (IS_ERR(rt)) {
642 err = PTR_ERR(rt);
643 goto out;
644 }
645
1da177e4
LT		 646 ipv6_addr_copy(&ifa->addr, addr);
647
648 spin_lock_init(&ifa->lock);
649 init_timer(&ifa->timer);
c2e21293 650 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 651 ifa->timer.data = (unsigned long) ifa;
652 ifa->scope = scope;
653 ifa->prefix_len = pfxlen;
654 ifa->flags = flags | IFA_F_TENTATIVE;
655 ifa->cstamp = ifa->tstamp = jiffies;
656
57f5f544
KF		 657 ifa->rt = rt;
658
95c385b4
NH		 659 /*
660 * part one of RFC 4429, section 3.3
661 * We should not configure an address as
662 * optimistic if we do not yet know the link
663 * layer address of our nexhop router
664 */
665
666 if (rt->rt6i_nexthop == NULL)
667 ifa->flags &= ~IFA_F_OPTIMISTIC;
668
1da177e4
LT		 669 ifa->idev = idev;
670 in6_dev_hold(idev);
671 /* For caller */
672 in6_ifa_hold(ifa);
673
674 /* Add to big hash table */
675 hash = ipv6_addr_hash(addr);
676
5c578aed 677 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1da177e4 678 in6_ifa_hold(ifa);
5c578aed 679 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 680
681 write_lock(&idev->lock);
682 /* Add to inet6_dev unicast addr list. */
e55ffac6 683 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 684
685#ifdef CONFIG_IPV6_PRIVACY
686 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 687 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 688 in6_ifa_hold(ifa);
689 }
690#endif
691
1da177e4
LT		 692 in6_ifa_hold(ifa);
693 write_unlock(&idev->lock);
694out2:
8814c4b5 695 rcu_read_unlock_bh();
1da177e4 696
fd92833a 697 if (likely(err == 0))
e041c683 698 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 699 else {
700 kfree(ifa);
701 ifa = ERR_PTR(err);
702 }
703
704 return ifa;
705out:
5c578aed 706 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 707 goto out2;
708}
709
710/* This function wants to get referenced ifp and releases it before return */
711
712static void ipv6_del_addr(struct inet6_ifaddr *ifp)
713{
502a2ffd 714 struct inet6_ifaddr *ifa, *ifn;
1da177e4
LT		 715 struct inet6_dev *idev = ifp->idev;
716 int hash;
717 int deleted = 0, onlink = 0;
718 unsigned long expires = jiffies;
719
720 hash = ipv6_addr_hash(&ifp->addr);
721
722 ifp->dead = 1;
723
5c578aed 724 spin_lock_bh(&addrconf_hash_lock);
725 hlist_del_init_rcu(&ifp->addr_lst);
c2e21293 726 __in6_ifa_put(ifp);
5c578aed 727 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 728
729 write_lock_bh(&idev->lock);
730#ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 732 list_del(&ifp->tmp_list);
733 if (ifp->ifpub) {
734 in6_ifa_put(ifp->ifpub);
735 ifp->ifpub = NULL;
1da177e4 736 }
372e6c8f 737 __in6_ifa_put(ifp);
1da177e4
LT		 738 }
739#endif
740
502a2ffd 741 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 742 if (ifa == ifp) {
502a2ffd 743 list_del_init(&ifp->if_list);
1da177e4 744 __in6_ifa_put(ifp);
502a2ffd 745
1da177e4
LT		 746 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
747 break;
748 deleted = 1;
1d142804 749 continue;
1da177e4
LT		 750 } else if (ifp->flags & IFA_F_PERMANENT) {
751 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
752 ifp->prefix_len)) {
753 if (ifa->flags & IFA_F_PERMANENT) {
754 onlink = 1;
755 if (deleted)
756 break;
757 } else {
758 unsigned long lifetime;
759
760 if (!onlink)
761 onlink = -1;
762
763 spin_lock(&ifa->lock);
4bed72e4
YH		 764
765 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
766 /*
767 * Note: Because this address is
768 * not permanent, lifetime <
769 * LONG_MAX / HZ here.
770 */
1da177e4
LT		 771 if (time_before(expires,
772 ifa->tstamp + lifetime * HZ))
773 expires = ifa->tstamp + lifetime * HZ;
774 spin_unlock(&ifa->lock);
775 }
776 }
777 }
778 }
779 write_unlock_bh(&idev->lock);
780
b2238566
AV		 781 addrconf_del_timer(ifp);
782
1da177e4
LT		 783 ipv6_ifa_notify(RTM_DELADDR, ifp);
784
e041c683 785 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 786
1da177e4
LT		 787 /*
788 * Purge or update corresponding prefix
789 *
790 * 1) we don't purge prefix here if address was not permanent.
791 * prefix is managed by its own lifetime.
792 * 2) if there're no addresses, delete prefix.
793 * 3) if there're still other permanent address(es),
794 * corresponding prefix is still permanent.
795 * 4) otherwise, update prefix lifetime to the
796 * longest valid lifetime among the corresponding
797 * addresses on the device.
798 * Note: subsequent RA will update lifetime.
799 *
800 * --yoshfuji
801 */
802 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
803 struct in6_addr prefix;
804 struct rt6_info *rt;
c346dca1 805 struct net *net = dev_net(ifp->idev->dev);
1da177e4 806 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 807 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 808
2b5ead46 809 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 810 if (onlink == 0) {
e0a1ad73 811 ip6_del_rt(rt);
1da177e4
LT		 812 rt = NULL;
813 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
814 rt->rt6i_expires = expires;
815 rt->rt6i_flags |= RTF_EXPIRES;
816 }
817 }
818 dst_release(&rt->u.dst);
819 }
820
821 in6_ifa_put(ifp);
822}
823
824#ifdef CONFIG_IPV6_PRIVACY
825static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
826{
827 struct inet6_dev *idev = ifp->idev;
828 struct in6_addr addr, *tmpaddr;
829 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 830 unsigned long regen_advance;
1da177e4
LT		 831 int tmp_plen;
832 int ret = 0;
833 int max_addresses;
95c385b4 834 u32 addr_flags;
1da177e4
LT		 835
836 write_lock(&idev->lock);
837 if (ift) {
838 spin_lock_bh(&ift->lock);
839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
840 spin_unlock_bh(&ift->lock);
841 tmpaddr = &addr;
842 } else {
843 tmpaddr = NULL;
844 }
845retry:
846 in6_dev_hold(idev);
847 if (idev->cnf.use_tempaddr <= 0) {
848 write_unlock(&idev->lock);
849 printk(KERN_INFO
850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
851 in6_dev_put(idev);
852 ret = -1;
853 goto out;
854 }
855 spin_lock_bh(&ifp->lock);
856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
857 idev->cnf.use_tempaddr = -1; /*XXX*/
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
860 printk(KERN_WARNING
861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 in6_ifa_hold(ifp);
867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
873 in6_ifa_put(ifp);
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 memcpy(&addr.s6_addr[8], idev->rndid, 8);
879 tmp_valid_lft = min_t(__u32,
880 ifp->valid_lft,
881 idev->cnf.temp_valid_lft);
1ab1457c
YH		 882 tmp_prefered_lft = min_t(__u32,
883 ifp->prefered_lft,
1da177e4
LT		 884 idev->cnf.temp_prefered_lft - desync_factor / HZ);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
eac55bf9
BB		 891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
1da177e4 894 write_unlock(&idev->lock);
95c385b4 895
eac55bf9
BB		 896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
95c385b4
NH		 908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
1da177e4 913 ift = !max_addresses ||
1ab1457c 914 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 915 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
1da177e4
LT		 918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939out:
940 return ret;
941}
942#endif
943
944/*
072047e4 945 * Choose an appropriate source address (RFC3484)
1da177e4 946 */
a9b05723
YH		 947enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952#ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954#endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957#ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959#endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963};
964
072047e4 965struct ipv6_saddr_score {
a9b05723
YH		 966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
072047e4
YH		 972};
973
a9b05723 974struct ipv6_saddr_dst {
9acd9f3a 975 const struct in6_addr *addr;
a9b05723
YH		 976 int ifindex;
977 int scope;
978 int label;
7cbca67c 979 unsigned int prefs;
a9b05723 980};
072047e4 981
b6f99a21 982static inline int ipv6_saddr_preferred(int type)
1da177e4 983{
45bb0060 984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 985 return 1;
986 return 0;
1da177e4
LT		 987}
988
3de23255
BT		 989static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
a9b05723
YH		 991 struct ipv6_saddr_dst *dst,
992 int i)
993{
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053#ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
7cbca67c 1055 {
a9b05723 1056 /* Rule 4: Prefer home address */
7cbca67c
YH		 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1059 break;
7cbca67c 1060 }
a9b05723
YH		 1061#endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
3de23255
BT		 1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073#ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1075 {
a9b05723
YH		 1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1078 */
7cbca67c
YH		 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1083 break;
7cbca67c 1084 }
a9b05723
YH		 1085#endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105out:
1106 return ret;
1107}
1108
191cd582 1109int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1110 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1111 struct in6_addr *saddr)
1da177e4 1112{
a9b05723
YH		 1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1115 struct ipv6_saddr_dst dst;
072047e4 1116 struct net_device *dev;
a9b05723 1117 int dst_type;
1da177e4 1118
a9b05723
YH		 1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1124 dst.prefs = prefs;
a9b05723
YH		 1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1da177e4 1128
8814c4b5 1129 rcu_read_lock();
1da177e4 1130
c6d14c84 1131 for_each_netdev_rcu(net, dev) {
072047e4 1132 struct inet6_dev *idev;
072047e4 1133
a9b05723 1134 /* Candidate Source Address (section 4)
072047e4
YH		 1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
a9b05723
YH		 1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1149 continue;
1da177e4 1150
1da177e4 1151 idev = __in6_dev_get(dev);
072047e4
YH		 1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
502a2ffd 1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1157 int i;
072047e4 1158
a9b05723 1159 /*
6b3ae80a
YH		 1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
95c385b4 1163 * sense, unless it is also flagged as optimistic.
6b3ae80a 1164 * - Candidate Source Address (section 4)
072047e4
YH		 1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
a9b05723
YH		 1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1171 continue;
a9b05723
YH		 1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1177 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1178 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
a9b05723
YH		 1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
3de23255
BT		 1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
a9b05723
YH		 1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
a0bffffc 1213 swap(hiscore, score);
a9b05723
YH		 1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1da177e4 1219 }
072047e4 1220 }
1da177e4 1221 }
a9b05723 1222try_nextdev:
072047e4 1223 read_unlock_bh(&idev->lock);
1da177e4 1224 }
8814c4b5 1225 rcu_read_unlock();
1da177e4 1226
a9b05723 1227 if (!hiscore->ifa)
072047e4 1228 return -EADDRNOTAVAIL;
1ab1457c 1229
a9b05723
YH		 1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
072047e4 1232 return 0;
1da177e4 1233}
5e5f3f0f 1234EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1235
95c385b4
NH		 1236int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1da177e4
LT		 1238{
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
8814c4b5 1242 rcu_read_lock();
e21e8467
SH		 1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1da177e4
LT		 1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
502a2ffd 1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
8814c4b5 1258 rcu_read_unlock();
1da177e4
LT		 1259 return err;
1260}
1261
1262static int ipv6_count_addresses(struct inet6_dev *idev)
1263{
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
502a2ffd 1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272}
1273
bfeade08
DL		 1274int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1da177e4 1276{
c2e21293 1277 struct inet6_ifaddr *ifp = NULL;
1278 struct hlist_node *node;
3a88a81d 1279 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1280
5c578aed 1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1283 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1284 continue;
1da177e4
LT		 1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE)) {
1287 if (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1289 break;
1290 }
1291 }
5c578aed 1292 rcu_read_unlock_bh();
1293
1da177e4
LT		 1294 return ifp != NULL;
1295}
7159039a
YH		 1296EXPORT_SYMBOL(ipv6_chk_addr);
1297
3e81c6da
DM		 1298static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1299 struct net_device *dev)
1da177e4 1300{
3e81c6da 1301 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1302 struct inet6_ifaddr *ifp;
1303 struct hlist_node *node;
1da177e4 1304
c2e21293 1305 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1306 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1307 continue;
1da177e4
LT		 1308 if (ipv6_addr_equal(&ifp->addr, addr)) {
1309 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1310 return true;
1da177e4
LT		 1311 }
1312 }
3e81c6da 1313 return false;
1da177e4
LT		 1314}
1315
52eeeb84
YH		 1316int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1317{
1318 struct inet6_dev *idev;
1319 struct inet6_ifaddr *ifa;
1320 int onlink;
1321
1322 onlink = 0;
1323 rcu_read_lock();
1324 idev = __in6_dev_get(dev);
1325 if (idev) {
1326 read_lock_bh(&idev->lock);
502a2ffd 1327 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1328 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1329 ifa->prefix_len);
1330 if (onlink)
1331 break;
1332 }
1333 read_unlock_bh(&idev->lock);
1334 }
1335 rcu_read_unlock();
1336 return onlink;
1337}
1338
1339EXPORT_SYMBOL(ipv6_chk_prefix);
1340
9acd9f3a 1341struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1342 struct net_device *dev, int strict)
1da177e4 1343{
c2e21293 1344 struct inet6_ifaddr *ifp = NULL;
1345 struct hlist_node *node;
3a88a81d 1346 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1347
5c578aed 1348 rcu_read_lock_bh();
1349 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1350 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1351 continue;
1da177e4
LT		 1352 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353 if (dev == NULL || ifp->idev->dev == dev ||
1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1355 in6_ifa_hold(ifp);
1356 break;
1357 }
1358 }
1359 }
5c578aed 1360 rcu_read_unlock_bh();
1da177e4
LT		 1361
1362 return ifp;
1363}
1364
1da177e4
LT		 1365/* Gets referenced address, destroys ifaddr */
1366
cc411d0b 1367static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1368{
1da177e4
LT		 1369 if (ifp->flags&IFA_F_PERMANENT) {
1370 spin_lock_bh(&ifp->lock);
1371 addrconf_del_timer(ifp);
1372 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1373 if (dad_failed)
1374 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1375 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1376 if (dad_failed)
1377 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1378 in6_ifa_put(ifp);
1379#ifdef CONFIG_IPV6_PRIVACY
1380 } else if (ifp->flags&IFA_F_TEMPORARY) {
1381 struct inet6_ifaddr *ifpub;
1382 spin_lock_bh(&ifp->lock);
1383 ifpub = ifp->ifpub;
1384 if (ifpub) {
1385 in6_ifa_hold(ifpub);
1386 spin_unlock_bh(&ifp->lock);
1387 ipv6_create_tempaddr(ifpub, ifp);
1388 in6_ifa_put(ifpub);
1389 } else {
1390 spin_unlock_bh(&ifp->lock);
1391 }
1392 ipv6_del_addr(ifp);
1393#endif
1394 } else
1395 ipv6_del_addr(ifp);
1396}
1397
3c21edbd
YH		 1398void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1399{
1b34be74 1400 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1401
1402 if (net_ratelimit())
0522fea6
JR		 1403 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1404 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1405
1b34be74
YH		 1406 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1407 struct in6_addr addr;
1408
1409 addr.s6_addr32[0] = htonl(0xfe800000);
1410 addr.s6_addr32[1] = 0;
1411
1412 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1413 ipv6_addr_equal(&ifp->addr, &addr)) {
1414 /* DAD failed for link-local based on MAC address */
1415 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1416
1417 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1418 ifp->idev->dev->name);
1b34be74
YH		 1419 }
1420 }
1421
cc411d0b 1422 addrconf_dad_stop(ifp, 1);
3c21edbd 1423}
1da177e4
LT		 1424
1425/* Join to solicited addr multicast group. */
1426
1427void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1428{
1429 struct in6_addr maddr;
1430
1431 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1432 return;
1433
1434 addrconf_addr_solict_mult(addr, &maddr);
1435 ipv6_dev_mc_inc(dev, &maddr);
1436}
1437
1438void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1439{
1440 struct in6_addr maddr;
1441
1442 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1443 return;
1444
1445 addrconf_addr_solict_mult(addr, &maddr);
1446 __ipv6_dev_mc_dec(idev, &maddr);
1447}
1448
20380731 1449static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1450{
1451 struct in6_addr addr;
1452 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1453 if (ipv6_addr_any(&addr))
1454 return;
1455 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1456}
1457
20380731 1458static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1459{
1460 struct in6_addr addr;
1461 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1462 if (ipv6_addr_any(&addr))
1463 return;
1464 __ipv6_dev_ac_dec(ifp->idev, &addr);
1465}
1466
073a8e0e
YH		 1467static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1468{
1469 if (dev->addr_len != ETH_ALEN)
1470 return -1;
1471 memcpy(eui, dev->dev_addr, 3);
1472 memcpy(eui + 5, dev->dev_addr + 3, 3);
1473
1474 /*
1475 * The zSeries OSA network cards can be shared among various
1476 * OS instances, but the OSA cards have only one MAC address.
1477 * This leads to duplicate address conflicts in conjunction
1478 * with IPv6 if more than one instance uses the same card.
1479 *
1480 * The driver for these cards can deliver a unique 16-bit
1481 * identifier for each instance sharing the same card. It is
1482 * placed instead of 0xFFFE in the interface identifier. The
1483 * "u" bit of the interface identifier is not inverted in this
1484 * case. Hence the resulting interface identifier has local
1485 * scope according to RFC2373.
1486 */
1487 if (dev->dev_id) {
1488 eui[3] = (dev->dev_id >> 8) & 0xFF;
1489 eui[4] = dev->dev_id & 0xFF;
1490 } else {
1491 eui[3] = 0xFF;
1492 eui[4] = 0xFE;
1493 eui[0] ^= 2;
1494 }
1495 return 0;
1496}
1497
1498static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1499{
1500 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1501 if (dev->addr_len != ARCNET_ALEN)
1502 return -1;
1503 memset(eui, 0, 7);
1504 eui[7] = *(u8*)dev->dev_addr;
1505 return 0;
1506}
1507
1508static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1509{
1510 if (dev->addr_len != INFINIBAND_ALEN)
1511 return -1;
1512 memcpy(eui, dev->dev_addr + 12, 8);
1513 eui[0] |= 2;
1514 return 0;
1515}
1516
dfd982ba
YH		 1517int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1518{
9af28511
SH		 1519 if (addr == 0)
1520 return -1;
dfd982ba
YH		 1521 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1522 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1523 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1524 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1525 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1526 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1527 eui[1] = 0;
1528 eui[2] = 0x5E;
1529 eui[3] = 0xFE;
1530 memcpy(eui + 4, &addr, 4);
1531 return 0;
1532}
1533EXPORT_SYMBOL(__ipv6_isatap_ifid);
1534
1535static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1536{
1537 if (dev->priv_flags & IFF_ISATAP)
1538 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1539 return -1;
1540}
1541
1da177e4
LT		 1542static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1543{
1544 switch (dev->type) {
1545 case ARPHRD_ETHER:
1546 case ARPHRD_FDDI:
1547 case ARPHRD_IEEE802_TR:
073a8e0e 1548 return addrconf_ifid_eui48(eui, dev);
1da177e4 1549 case ARPHRD_ARCNET:
073a8e0e 1550 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1551 case ARPHRD_INFINIBAND:
073a8e0e 1552 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1553 case ARPHRD_SIT:
dfd982ba 1554 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1555 }
1556 return -1;
1557}
1558
1559static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1560{
1561 int err = -1;
1562 struct inet6_ifaddr *ifp;
1563
1564 read_lock_bh(&idev->lock);
502a2ffd 1565 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1566 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1567 memcpy(eui, ifp->addr.s6_addr+8, 8);
1568 err = 0;
1569 break;
1570 }
1571 }
1572 read_unlock_bh(&idev->lock);
1573 return err;
1574}
1575
1576#ifdef CONFIG_IPV6_PRIVACY
1577/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1578static int __ipv6_regen_rndid(struct inet6_dev *idev)
1579{
1da177e4 1580regen:
955189ef 1581 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1582 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1583
1584 /*
1585 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1586 * check if generated address is not inappropriate
1587 *
1588 * - Reserved subnet anycast (RFC 2526)
1589 * 11111101 11....11 1xxxxxxx
c7dc89c0 1590 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1591 * 00-00-5E-FE-xx-xx-xx-xx
1592 * - value 0
1593 * - XXX: already assigned to an address on the device
1594 */
1ab1457c 1595 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1596 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1597 (idev->rndid[7]&0x80))
1598 goto regen;
1599 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1600 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1601 goto regen;
1602 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1603 goto regen;
1604 }
1605
1606 return 0;
1607}
1608
1609static void ipv6_regen_rndid(unsigned long data)
1610{
1611 struct inet6_dev *idev = (struct inet6_dev *) data;
1612 unsigned long expires;
1613
8814c4b5 1614 rcu_read_lock_bh();
1da177e4
LT		 1615 write_lock_bh(&idev->lock);
1616
1617 if (idev->dead)
1618 goto out;
1619
1620 if (__ipv6_regen_rndid(idev) < 0)
1621 goto out;
1ab1457c 1622
1da177e4 1623 expires = jiffies +
1ab1457c 1624 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1625 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1626 if (time_before(expires, jiffies)) {
1627 printk(KERN_WARNING
1628 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1629 idev->dev->name);
1630 goto out;
1631 }
1632
1633 if (!mod_timer(&idev->regen_timer, expires))
1634 in6_dev_hold(idev);
1635
1636out:
1637 write_unlock_bh(&idev->lock);
8814c4b5 1638 rcu_read_unlock_bh();
1da177e4
LT		 1639 in6_dev_put(idev);
1640}
1641
1642static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1643 int ret = 0;
1644
1645 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1646 ret = __ipv6_regen_rndid(idev);
1647 return ret;
1648}
1649#endif
1650
1651/*
1652 * Add prefix route.
1653 */
1654
1655static void
1656addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1657 unsigned long expires, u32 flags)
1da177e4 1658{
86872cb5
TG		 1659 struct fib6_config cfg = {
1660 .fc_table = RT6_TABLE_PREFIX,
1661 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1662 .fc_ifindex = dev->ifindex,
1663 .fc_expires = expires,
1664 .fc_dst_len = plen,
1665 .fc_flags = RTF_UP | flags,
c346dca1 1666 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1667 .fc_protocol = RTPROT_KERNEL,
86872cb5 1668 };
1da177e4 1669
86872cb5 1670 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1671
1672 /* Prevent useless cloning on PtP SIT.
1673 This thing is done here expecting that the whole
1674 class of non-broadcast devices need not cloning.
1675 */
0be669bb 1676#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1677 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1678 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1679#endif
1da177e4 1680
86872cb5 1681 ip6_route_add(&cfg);
1da177e4
LT		 1682}
1683
1684/* Create "default" multicast route to the interface */
1685
1686static void addrconf_add_mroute(struct net_device *dev)
1687{
86872cb5
TG		 1688 struct fib6_config cfg = {
1689 .fc_table = RT6_TABLE_LOCAL,
1690 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1691 .fc_ifindex = dev->ifindex,
1692 .fc_dst_len = 8,
1693 .fc_flags = RTF_UP,
c346dca1 1694 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1695 };
1696
1697 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1698
1699 ip6_route_add(&cfg);
1da177e4
LT		 1700}
1701
0be669bb 1702#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1703static void sit_route_add(struct net_device *dev)
1704{
86872cb5
TG		 1705 struct fib6_config cfg = {
1706 .fc_table = RT6_TABLE_MAIN,
1707 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1708 .fc_ifindex = dev->ifindex,
1709 .fc_dst_len = 96,
1710 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1711 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1712 };
1da177e4
LT		 1713
1714 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1715 ip6_route_add(&cfg);
1da177e4 1716}
0be669bb 1717#endif
1da177e4
LT		 1718
1719static void addrconf_add_lroute(struct net_device *dev)
1720{
1721 struct in6_addr addr;
1722
1723 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1724 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1725}
1726
1727static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1728{
1729 struct inet6_dev *idev;
1730
1731 ASSERT_RTNL();
1732
e21e8467
SH		 1733 idev = ipv6_find_idev(dev);
1734 if (!idev)
1da177e4
LT		 1735 return NULL;
1736
1737 /* Add default multicast route */
1738 addrconf_add_mroute(dev);
1739
1740 /* Add link local route */
1741 addrconf_add_lroute(dev);
1742 return idev;
1743}
1744
1745void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1746{
1747 struct prefix_info *pinfo;
1748 __u32 valid_lft;
1749 __u32 prefered_lft;
1750 int addr_type;
1da177e4 1751 struct inet6_dev *in6_dev;
56d417b1 1752 struct net *net = dev_net(dev);
1da177e4
LT		 1753
1754 pinfo = (struct prefix_info *) opt;
1ab1457c 1755
1da177e4
LT		 1756 if (len < sizeof(struct prefix_info)) {
1757 ADBG(("addrconf: prefix option too short\n"));
1758 return;
1759 }
1ab1457c 1760
1da177e4
LT		 1761 /*
1762 * Validation checks ([ADDRCONF], page 19)
1763 */
1764
1765 addr_type = ipv6_addr_type(&pinfo->prefix);
1766
1767 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1768 return;
1769
1770 valid_lft = ntohl(pinfo->valid);
1771 prefered_lft = ntohl(pinfo->prefered);
1772
1773 if (prefered_lft > valid_lft) {
1774 if (net_ratelimit())
1775 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1776 return;
1777 }
1778
1779 in6_dev = in6_dev_get(dev);
1780
1781 if (in6_dev == NULL) {
1782 if (net_ratelimit())
1783 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1784 return;
1785 }
1786
1787 /*
1788 * Two things going on here:
1789 * 1) Add routes for on-link prefixes
1790 * 2) Configure prefixes with the auto flag set
1791 */
1792
4bed72e4
YH		 1793 if (pinfo->onlink) {
1794 struct rt6_info *rt;
1795 unsigned long rt_expires;
1796
6f704992
YH		 1797 /* Avoid arithmetic overflow. Really, we could
1798 * save rt_expires in seconds, likely valid_lft,
1799 * but it would require division in fib gc, that it
1800 * not good.
1801 */
4bed72e4
YH		 1802 if (HZ > USER_HZ)
1803 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1804 else
1805 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1806
4bed72e4
YH		 1807 if (addrconf_finite_timeout(rt_expires))
1808 rt_expires *= HZ;
1da177e4 1809
56d417b1 1810 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1811 dev->ifindex, 1);
1da177e4 1812
2b5ead46 1813 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1814 /* Autoconf prefix route */
1815 if (valid_lft == 0) {
1816 ip6_del_rt(rt);
1817 rt = NULL;
4bed72e4 1818 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1819 /* not infinity */
1820 rt->rt6i_expires = jiffies + rt_expires;
1821 rt->rt6i_flags |= RTF_EXPIRES;
1822 } else {
1823 rt->rt6i_flags &= ~RTF_EXPIRES;
1824 rt->rt6i_expires = 0;
1da177e4
LT		 1825 }
1826 } else if (valid_lft) {
6f704992 1827 clock_t expires = 0;
4bed72e4
YH		 1828 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1829 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1830 /* not infinity */
1831 flags |= RTF_EXPIRES;
1832 expires = jiffies_to_clock_t(rt_expires);
1833 }
1da177e4 1834 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1835 dev, expires, flags);
1da177e4
LT		 1836 }
1837 if (rt)
1838 dst_release(&rt->u.dst);
1839 }
1840
1841 /* Try to figure out our local address for this prefix */
1842
1843 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1844 struct inet6_ifaddr * ifp;
1845 struct in6_addr addr;
1846 int create = 0, update_lft = 0;
1847
1848 if (pinfo->prefix_len == 64) {
1849 memcpy(&addr, &pinfo->prefix, 8);
1850 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1851 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1852 in6_dev_put(in6_dev);
1853 return;
1854 }
1855 goto ok;
1856 }
1857 if (net_ratelimit())
1858 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1859 pinfo->prefix_len);
1860 in6_dev_put(in6_dev);
1861 return;
1862
1863ok:
1864
53b7997f 1865 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1866
1867 if (ifp == NULL && valid_lft) {
1868 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1869 u32 addr_flags = 0;
1870
1871#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1872 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1873 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1874 addr_flags = IFA_F_OPTIMISTIC;
1875#endif
1da177e4
LT		 1876
1877 /* Do not allow to create too much of autoconfigured
1878 * addresses; this would be too easy way to crash kernel.
1879 */
1880 if (!max_addresses ||
1881 ipv6_count_addresses(in6_dev) < max_addresses)
1882 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1883 addr_type&IPV6_ADDR_SCOPE_MASK,
1884 addr_flags);
1da177e4
LT		 1885
1886 if (!ifp || IS_ERR(ifp)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890
1891 update_lft = create = 1;
1892 ifp->cstamp = jiffies;
1893 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1894 }
1895
1896 if (ifp) {
1897 int flags;
1898 unsigned long now;
1899#ifdef CONFIG_IPV6_PRIVACY
1900 struct inet6_ifaddr *ift;
1901#endif
1902 u32 stored_lft;
1903
1904 /* update lifetime (RFC2462 5.5.3 e) */
1905 spin_lock(&ifp->lock);
1906 now = jiffies;
1907 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1908 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1909 else
1910 stored_lft = 0;
1911 if (!update_lft && stored_lft) {
1912 if (valid_lft > MIN_VALID_LIFETIME ||
1913 valid_lft > stored_lft)
1914 update_lft = 1;
1915 else if (stored_lft <= MIN_VALID_LIFETIME) {
1916 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1917 /*
1918 * RFC 4862 Section 5.5.3e:
1919 * "Note that the preferred lifetime of
1920 * the corresponding address is always
1921 * reset to the Preferred Lifetime in
1922 * the received Prefix Information
1923 * option, regardless of whether the
1924 * valid lifetime is also reset or
1925 * ignored."
1926 *
1927 * So if the preferred lifetime in
1928 * this advertisement is different
1929 * than what we have stored, but the
1930 * valid lifetime is invalid, just
1931 * reset prefered_lft.
1932 *
1933 * We must set the valid lifetime
1934 * to the stored lifetime since we'll
1935 * be updating the timestamp below,
1936 * else we'll set it back to the
1937 * minumum.
1938 */
1939 if (prefered_lft != ifp->prefered_lft) {
1940 valid_lft = stored_lft;
1941 update_lft = 1;
1942 }
1da177e4
LT		 1943 } else {
1944 valid_lft = MIN_VALID_LIFETIME;
1945 if (valid_lft < prefered_lft)
1946 prefered_lft = valid_lft;
1947 update_lft = 1;
1948 }
1949 }
1950
1951 if (update_lft) {
1952 ifp->valid_lft = valid_lft;
1953 ifp->prefered_lft = prefered_lft;
1954 ifp->tstamp = now;
1955 flags = ifp->flags;
1956 ifp->flags &= ~IFA_F_DEPRECATED;
1957 spin_unlock(&ifp->lock);
1958
1959 if (!(flags&IFA_F_TENTATIVE))
1960 ipv6_ifa_notify(0, ifp);
1961 } else
1962 spin_unlock(&ifp->lock);
1963
1964#ifdef CONFIG_IPV6_PRIVACY
1965 read_lock_bh(&in6_dev->lock);
1966 /* update all temporary addresses in the list */
372e6c8f 1967 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1968 /*
1969 * When adjusting the lifetimes of an existing
1970 * temporary address, only lower the lifetimes.
1971 * Implementations must not increase the
1972 * lifetimes of an existing temporary address
1973 * when processing a Prefix Information Option.
1974 */
c6fbfac2
BB		 1975 if (ifp != ift->ifpub)
1976 continue;
1977
1da177e4
LT		 1978 spin_lock(&ift->lock);
1979 flags = ift->flags;
1980 if (ift->valid_lft > valid_lft &&
1981 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1982 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1983 if (ift->prefered_lft > prefered_lft &&
1984 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1985 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1986 spin_unlock(&ift->lock);
1987 if (!(flags&IFA_F_TENTATIVE))
1988 ipv6_ifa_notify(0, ift);
1989 }
1990
1991 if (create && in6_dev->cnf.use_tempaddr > 0) {
1992 /*
1993 * When a new public address is created as described in [ADDRCONF],
1994 * also create a new temporary address.
1995 */
1ab1457c 1996 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1997 ipv6_create_tempaddr(ifp, NULL);
1998 } else {
1999 read_unlock_bh(&in6_dev->lock);
2000 }
2001#endif
2002 in6_ifa_put(ifp);
2003 addrconf_verify(0);
2004 }
2005 }
2006 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2007 in6_dev_put(in6_dev);
2008}
2009
2010/*
2011 * Set destination address.
2012 * Special case for SIT interfaces where we create a new "virtual"
2013 * device.
2014 */
af284937 2015int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2016{
2017 struct in6_ifreq ireq;
2018 struct net_device *dev;
2019 int err = -EINVAL;
2020
2021 rtnl_lock();
2022
2023 err = -EFAULT;
2024 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2025 goto err_exit;
2026
af284937 2027 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2028
2029 err = -ENODEV;
2030 if (dev == NULL)
2031 goto err_exit;
2032
0be669bb 2033#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2034 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2035 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2036 struct ifreq ifr;
1da177e4
LT		 2037 struct ip_tunnel_parm p;
2038
2039 err = -EADDRNOTAVAIL;
2040 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2041 goto err_exit;
2042
2043 memset(&p, 0, sizeof(p));
2044 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2045 p.iph.saddr = 0;
2046 p.iph.version = 4;
2047 p.iph.ihl = 5;
2048 p.iph.protocol = IPPROTO_IPV6;
2049 p.iph.ttl = 64;
d20b3109 2050 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2051
5bc3eb7e
SH		 2052 if (ops->ndo_do_ioctl) {
2053 mm_segment_t oldfs = get_fs();
2054
2055 set_fs(KERNEL_DS);
2056 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2057 set_fs(oldfs);
2058 } else
2059 err = -EOPNOTSUPP;
1da177e4
LT		 2060
2061 if (err == 0) {
2062 err = -ENOBUFS;
af284937
DL		 2063 dev = __dev_get_by_name(net, p.name);
2064 if (!dev)
1da177e4
LT		 2065 goto err_exit;
2066 err = dev_open(dev);
2067 }
2068 }
0be669bb 2069#endif
1da177e4
LT		 2070
2071err_exit:
2072 rtnl_unlock();
2073 return err;
2074}
2075
2076/*
2077 * Manual configuration of address on an interface
2078 */
af284937 2079static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2080 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2081 __u32 valid_lft)
1da177e4
LT		 2082{
2083 struct inet6_ifaddr *ifp;
2084 struct inet6_dev *idev;
2085 struct net_device *dev;
2086 int scope;
6f704992
YH		 2087 u32 flags;
2088 clock_t expires;
4bed72e4 2089 unsigned long timeout;
1da177e4
LT		 2090
2091 ASSERT_RTNL();
1ab1457c 2092
24ef0da7
TG		 2093 if (plen > 128)
2094 return -EINVAL;
2095
0778769d
NT		 2096 /* check the lifetime */
2097 if (!valid_lft || prefered_lft > valid_lft)
2098 return -EINVAL;
2099
af284937
DL		 2100 dev = __dev_get_by_index(net, ifindex);
2101 if (!dev)
1da177e4 2102 return -ENODEV;
1ab1457c 2103
1da177e4
LT		 2104 if ((idev = addrconf_add_dev(dev)) == NULL)
2105 return -ENOBUFS;
2106
2107 scope = ipv6_addr_scope(pfx);
2108
4bed72e4
YH		 2109 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2110 if (addrconf_finite_timeout(timeout)) {
2111 expires = jiffies_to_clock_t(timeout * HZ);
2112 valid_lft = timeout;
6f704992 2113 flags = RTF_EXPIRES;
4bed72e4
YH		 2114 } else {
2115 expires = 0;
2116 flags = 0;
2117 ifa_flags |= IFA_F_PERMANENT;
6f704992 2118 }
0778769d 2119
4bed72e4
YH		 2120 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2121 if (addrconf_finite_timeout(timeout)) {
2122 if (timeout == 0)
2123 ifa_flags |= IFA_F_DEPRECATED;
2124 prefered_lft = timeout;
2125 }
0778769d
NT		 2126
2127 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2128
1da177e4 2129 if (!IS_ERR(ifp)) {
06aebfb7 2130 spin_lock_bh(&ifp->lock);
0778769d
NT		 2131 ifp->valid_lft = valid_lft;
2132 ifp->prefered_lft = prefered_lft;
2133 ifp->tstamp = jiffies;
06aebfb7 2134 spin_unlock_bh(&ifp->lock);
0778769d 2135
46d48046 2136 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2137 expires, flags);
95c385b4
NH		 2138 /*
2139 * Note that section 3.1 of RFC 4429 indicates
2140 * that the Optimistic flag should not be set for
2141 * manually configured addresses
2142 */
1da177e4
LT		 2143 addrconf_dad_start(ifp, 0);
2144 in6_ifa_put(ifp);
0778769d 2145 addrconf_verify(0);
1da177e4
LT		 2146 return 0;
2147 }
2148
2149 return PTR_ERR(ifp);
2150}
2151
af284937 2152static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2153 unsigned int plen)
1da177e4
LT		 2154{
2155 struct inet6_ifaddr *ifp;
2156 struct inet6_dev *idev;
2157 struct net_device *dev;
1ab1457c 2158
24ef0da7
TG		 2159 if (plen > 128)
2160 return -EINVAL;
2161
af284937
DL		 2162 dev = __dev_get_by_index(net, ifindex);
2163 if (!dev)
1da177e4
LT		 2164 return -ENODEV;
2165
2166 if ((idev = __in6_dev_get(dev)) == NULL)
2167 return -ENXIO;
2168
2169 read_lock_bh(&idev->lock);
502a2ffd 2170 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2171 if (ifp->prefix_len == plen &&
2172 ipv6_addr_equal(pfx, &ifp->addr)) {
2173 in6_ifa_hold(ifp);
2174 read_unlock_bh(&idev->lock);
1ab1457c 2175
1da177e4
LT		 2176 ipv6_del_addr(ifp);
2177
2178 /* If the last address is deleted administratively,
2179 disable IPv6 on this interface.
2180 */
502a2ffd 2181 if (list_empty(&idev->addr_list))
1da177e4
LT		 2182 addrconf_ifdown(idev->dev, 1);
2183 return 0;
2184 }
2185 }
2186 read_unlock_bh(&idev->lock);
2187 return -EADDRNOTAVAIL;
2188}
2189
2190
af284937 2191int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2192{
2193 struct in6_ifreq ireq;
2194 int err;
1ab1457c 2195
1da177e4
LT		 2196 if (!capable(CAP_NET_ADMIN))
2197 return -EPERM;
1ab1457c 2198
1da177e4
LT		 2199 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2200 return -EFAULT;
2201
2202 rtnl_lock();
af284937
DL		 2203 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2204 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2205 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2206 rtnl_unlock();
2207 return err;
2208}
2209
af284937 2210int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2211{
2212 struct in6_ifreq ireq;
2213 int err;
1ab1457c 2214
1da177e4
LT		 2215 if (!capable(CAP_NET_ADMIN))
2216 return -EPERM;
2217
2218 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2219 return -EFAULT;
2220
2221 rtnl_lock();
af284937
DL		 2222 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2223 ireq.ifr6_prefixlen);
1da177e4
LT		 2224 rtnl_unlock();
2225 return err;
2226}
2227
b5f348e5
IJ		 2228static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2229 int plen, int scope)
2230{
2231 struct inet6_ifaddr *ifp;
2232
2233 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2234 if (!IS_ERR(ifp)) {
2235 spin_lock_bh(&ifp->lock);
2236 ifp->flags &= ~IFA_F_TENTATIVE;
2237 spin_unlock_bh(&ifp->lock);
2238 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2239 in6_ifa_put(ifp);
2240 }
2241}
2242
0be669bb 2243#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2244static void sit_add_v4_addrs(struct inet6_dev *idev)
2245{
1da177e4
LT		 2246 struct in6_addr addr;
2247 struct net_device *dev;
c346dca1 2248 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2249 int scope;
2250
2251 ASSERT_RTNL();
2252
2253 memset(&addr, 0, sizeof(struct in6_addr));
2254 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2255
2256 if (idev->dev->flags&IFF_POINTOPOINT) {
2257 addr.s6_addr32[0] = htonl(0xfe800000);
2258 scope = IFA_LINK;
2259 } else {
2260 scope = IPV6_ADDR_COMPATv4;
2261 }
2262
2263 if (addr.s6_addr32[3]) {
b5f348e5 2264 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2265 return;
2266 }
2267
6fda7350 2268 for_each_netdev(net, dev) {
e5ed6399 2269 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2270 if (in_dev && (dev->flags & IFF_UP)) {
2271 struct in_ifaddr * ifa;
2272
2273 int flag = scope;
2274
2275 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2276 int plen;
2277
2278 addr.s6_addr32[3] = ifa->ifa_local;
2279
2280 if (ifa->ifa_scope == RT_SCOPE_LINK)
2281 continue;
2282 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2283 if (idev->dev->flags&IFF_POINTOPOINT)
2284 continue;
2285 flag |= IFA_HOST;
2286 }
2287 if (idev->dev->flags&IFF_POINTOPOINT)
2288 plen = 64;
2289 else
2290 plen = 96;
2291
b5f348e5 2292 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2293 }
2294 }
1ab1457c 2295 }
1da177e4 2296}
0be669bb 2297#endif
1da177e4
LT		 2298
2299static void init_loopback(struct net_device *dev)
2300{
2301 struct inet6_dev *idev;
1da177e4
LT		 2302
2303 /* ::1 */
2304
2305 ASSERT_RTNL();
2306
2307 if ((idev = ipv6_find_idev(dev)) == NULL) {
2308 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2309 return;
2310 }
2311
b5f348e5 2312 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2313}
2314
2315static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2316{
2317 struct inet6_ifaddr * ifp;
95c385b4
NH		 2318 u32 addr_flags = IFA_F_PERMANENT;
2319
2320#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2321 if (idev->cnf.optimistic_dad &&
702beb87 2322 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2323 addr_flags |= IFA_F_OPTIMISTIC;
2324#endif
1da177e4 2325
95c385b4
NH		 2326
2327 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2328 if (!IS_ERR(ifp)) {
46d48046 2329 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2330 addrconf_dad_start(ifp, 0);
2331 in6_ifa_put(ifp);
2332 }
2333}
2334
2335static void addrconf_dev_config(struct net_device *dev)
2336{
2337 struct in6_addr addr;
2338 struct inet6_dev * idev;
2339
2340 ASSERT_RTNL();
2341
74235a25
HX		 2342 if ((dev->type != ARPHRD_ETHER) &&
2343 (dev->type != ARPHRD_FDDI) &&
2344 (dev->type != ARPHRD_IEEE802_TR) &&
2345 (dev->type != ARPHRD_ARCNET) &&
2346 (dev->type != ARPHRD_INFINIBAND)) {
2347 /* Alas, we support only Ethernet autoconfiguration. */
2348 return;
2349 }
2350
1da177e4
LT		 2351 idev = addrconf_add_dev(dev);
2352 if (idev == NULL)
2353 return;
2354
2355 memset(&addr, 0, sizeof(struct in6_addr));
2356 addr.s6_addr32[0] = htonl(0xFE800000);
2357
2358 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2359 addrconf_add_linklocal(idev, &addr);
2360}
2361
0be669bb 2362#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2363static void addrconf_sit_config(struct net_device *dev)
2364{
2365 struct inet6_dev *idev;
2366
2367 ASSERT_RTNL();
2368
1ab1457c
YH		 2369 /*
2370 * Configure the tunnel with one of our IPv4
2371 * addresses... we should configure all of
1da177e4
LT		 2372 * our v4 addrs in the tunnel
2373 */
2374
2375 if ((idev = ipv6_find_idev(dev)) == NULL) {
2376 printk(KERN_DEBUG "init sit: add_dev failed\n");
2377 return;
2378 }
2379
c7dc89c0
FT		 2380 if (dev->priv_flags & IFF_ISATAP) {
2381 struct in6_addr addr;
2382
2383 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2384 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2385 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2386 addrconf_add_linklocal(idev, &addr);
2387 return;
2388 }
2389
1da177e4
LT		 2390 sit_add_v4_addrs(idev);
2391
2392 if (dev->flags&IFF_POINTOPOINT) {
2393 addrconf_add_mroute(dev);
2394 addrconf_add_lroute(dev);
2395 } else
2396 sit_route_add(dev);
2397}
0be669bb 2398#endif
1da177e4
LT		 2399
2400static inline int
2401ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2402{
2403 struct in6_addr lladdr;
2404
95c385b4 2405 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2406 addrconf_add_linklocal(idev, &lladdr);
2407 return 0;
2408 }
2409 return -1;
2410}
2411
2412static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2413{
2414 struct net_device *link_dev;
c346dca1 2415 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2416
2417 /* first try to inherit the link-local address from the link device */
2418 if (idev->dev->iflink &&
6fda7350 2419 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2420 if (!ipv6_inherit_linklocal(idev, link_dev))
2421 return;
2422 }
2423 /* then try to inherit it from any device */
6fda7350 2424 for_each_netdev(net, link_dev) {
1da177e4
LT		 2425 if (!ipv6_inherit_linklocal(idev, link_dev))
2426 return;
2427 }
2428 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2429}
2430
2431/*
2432 * Autoconfigure tunnel with a link-local address so routing protocols,
2433 * DHCPv6, MLD etc. can be run over the virtual link
2434 */
2435
2436static void addrconf_ip6_tnl_config(struct net_device *dev)
2437{
2438 struct inet6_dev *idev;
2439
2440 ASSERT_RTNL();
2441
e21e8467
SH		 2442 idev = addrconf_add_dev(dev);
2443 if (!idev) {
1da177e4
LT		 2444 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2445 return;
2446 }
2447 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2448}
2449
1ab1457c 2450static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2451 void * data)
2452{
2453 struct net_device *dev = (struct net_device *) data;
74235a25 2454 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2455 int run_pending = 0;
b217d616 2456 int err;
1da177e4 2457
e21e8467 2458 switch (event) {
45ba9dd2 2459 case NETDEV_REGISTER:
74235a25 2460 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2461 idev = ipv6_add_dev(dev);
2462 if (!idev)
b217d616 2463 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2464 }
2465 break;
bcdd553f 2466
1da177e4 2467 case NETDEV_UP:
3c21edbd 2468 case NETDEV_CHANGE:
c2edacf8
JV		 2469 if (dev->flags & IFF_SLAVE)
2470 break;
2471
3c21edbd 2472 if (event == NETDEV_UP) {
f24e3d65 2473 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2474 /* device is not ready yet. */
2475 printk(KERN_INFO
2476 "ADDRCONF(NETDEV_UP): %s: "
2477 "link is not ready\n",
2478 dev->name);
2479 break;
2480 }
99081049 2481
d31c7b8f
EP		 2482 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2483 idev = ipv6_add_dev(dev);
2484
e3ec6cfc 2485 if (idev) {
99081049 2486 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2487 run_pending = 1;
2488 }
3c21edbd 2489 } else {
f24e3d65 2490 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2491 /* device is still not ready. */
2492 break;
2493 }
2494
2495 if (idev) {
bcdd553f 2496 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2497 /* device is already configured. */
2498 break;
3c21edbd
YH		 2499 idev->if_flags |= IF_READY;
2500 }
2501
2502 printk(KERN_INFO
2503 "ADDRCONF(NETDEV_CHANGE): %s: "
2504 "link becomes ready\n",
2505 dev->name);
2506
c5e33bdd 2507 run_pending = 1;
3c21edbd
YH		 2508 }
2509
e21e8467 2510 switch (dev->type) {
0be669bb 2511#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2512 case ARPHRD_SIT:
2513 addrconf_sit_config(dev);
2514 break;
0be669bb 2515#endif
1da177e4
LT		 2516 case ARPHRD_TUNNEL6:
2517 addrconf_ip6_tnl_config(dev);
2518 break;
2519 case ARPHRD_LOOPBACK:
2520 init_loopback(dev);
2521 break;
2522
2523 default:
2524 addrconf_dev_config(dev);
2525 break;
3ff50b79 2526 }
bcdd553f 2527
1da177e4 2528 if (idev) {
c5e33bdd
YH		 2529 if (run_pending)
2530 addrconf_dad_run(idev);
2531
bcdd553f
SH		 2532 /*
2533 * If the MTU changed during the interface down,
2534 * when the interface up, the changed MTU must be
2535 * reflected in the idev as well as routers.
1da177e4 2536 */
bcdd553f
SH		 2537 if (idev->cnf.mtu6 != dev->mtu &&
2538 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2539 rt6_mtu_change(dev, dev->mtu);
2540 idev->cnf.mtu6 = dev->mtu;
2541 }
2542 idev->tstamp = jiffies;
2543 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2544
2545 /*
2546 * If the changed mtu during down is lower than
2547 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2548 */
2549 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2550 addrconf_ifdown(dev, 1);
1da177e4
LT		 2551 }
2552 break;
2553
2554 case NETDEV_CHANGEMTU:
d31c7b8f 2555 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2556 rt6_mtu_change(dev, dev->mtu);
2557 idev->cnf.mtu6 = dev->mtu;
2558 break;
2559 }
2560
d31c7b8f
EP		 2561 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2562 idev = ipv6_add_dev(dev);
2563 if (idev)
2564 break;
2565 }
2566
bcdd553f
SH		 2567 /*
2568 * MTU falled under IPV6_MIN_MTU.
2569 * Stop IPv6 on this interface.
2570 */
1da177e4
LT		 2571
2572 case NETDEV_DOWN:
2573 case NETDEV_UNREGISTER:
2574 /*
2575 * Remove all addresses from this interface.
2576 */
2577 addrconf_ifdown(dev, event != NETDEV_DOWN);
2578 break;
3c21edbd 2579
1da177e4 2580 case NETDEV_CHANGENAME:
1da177e4 2581 if (idev) {
5632c515 2582 snmp6_unregister_dev(idev);
408c4768 2583 addrconf_sysctl_unregister(idev);
f52295a9 2584 addrconf_sysctl_register(idev);
b217d616
HX		 2585 err = snmp6_register_dev(idev);
2586 if (err)
2587 return notifier_from_errno(err);
5632c515 2588 }
1da177e4 2589 break;
bcdd553f 2590
93d9b7d7
JP		 2591 case NETDEV_PRE_TYPE_CHANGE:
2592 case NETDEV_POST_TYPE_CHANGE:
2593 addrconf_type_change(dev, event);
75c78500 2594 break;
3ff50b79 2595 }
1da177e4
LT		 2596
2597 return NOTIFY_OK;
2598}
2599
2600/*
2601 * addrconf module should be notified of a device going up
2602 */
2603static struct notifier_block ipv6_dev_notf = {
2604 .notifier_call = addrconf_notify,
1da177e4
LT		 2605};
2606
93d9b7d7 2607static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2608{
2609 struct inet6_dev *idev;
2610 ASSERT_RTNL();
2611
2612 idev = __in6_dev_get(dev);
2613
93d9b7d7 2614 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2615 ipv6_mc_remap(idev);
93d9b7d7 2616 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2617 ipv6_mc_unmap(idev);
2618}
2619
1da177e4
LT		 2620static int addrconf_ifdown(struct net_device *dev, int how)
2621{
c346dca1 2622 struct net *net = dev_net(dev);
502a2ffd 2623 struct inet6_dev *idev;
2624 struct inet6_ifaddr *ifa;
2625 LIST_HEAD(keep_list);
1da177e4
LT		 2626
2627 ASSERT_RTNL();
2628
f3db4851 2629 rt6_ifdown(net, dev);
1da177e4
LT		 2630 neigh_ifdown(&nd_tbl, dev);
2631
2632 idev = __in6_dev_get(dev);
2633 if (idev == NULL)
2634 return -ENODEV;
2635
bcdd553f
SH		 2636 /*
2637 * Step 1: remove reference to ipv6 device from parent device.
2638 * Do not dev_put!
1da177e4 2639 */
439e2385 2640 if (how) {
1da177e4 2641 idev->dead = 1;
8814c4b5
YH		 2642
2643 /* protected by rtnl_lock */
2644 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2645
2646 /* Step 1.5: remove snmp6 entry */
2647 snmp6_unregister_dev(idev);
2648
2649 }
2650
1da177e4
LT		 2651 write_lock_bh(&idev->lock);
2652
bcdd553f 2653 /* Step 2: clear flags for stateless addrconf */
439e2385 2654 if (!how)
3c21edbd 2655 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2656
1da177e4 2657#ifdef CONFIG_IPV6_PRIVACY
439e2385 2658 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2659 in6_dev_put(idev);
2660
bcdd553f 2661 /* Step 3: clear tempaddr list */
372e6c8f 2662 while (!list_empty(&idev->tempaddr_list)) {
2663 ifa = list_first_entry(&idev->tempaddr_list,
2664 struct inet6_ifaddr, tmp_list);
2665 list_del(&ifa->tmp_list);
1da177e4
LT		 2666 ifa->dead = 1;
2667 write_unlock_bh(&idev->lock);
2668 spin_lock_bh(&ifa->lock);
2669
2670 if (ifa->ifpub) {
2671 in6_ifa_put(ifa->ifpub);
2672 ifa->ifpub = NULL;
2673 }
2674 spin_unlock_bh(&ifa->lock);
2675 in6_ifa_put(ifa);
2676 write_lock_bh(&idev->lock);
2677 }
2678#endif
8f37ada5 2679
502a2ffd 2680 while (!list_empty(&idev->addr_list)) {
2681 ifa = list_first_entry(&idev->addr_list,
2682 struct inet6_ifaddr, if_list);
84e8b803 2683 addrconf_del_timer(ifa);
2684
2685 /* If just doing link down, and address is permanent
2686 and not link-local, then retain it. */
bcdd553f 2687 if (!how &&
84e8b803 2688 (ifa->flags&IFA_F_PERMANENT) &&
2689 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2690 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2691
84e8b803 2692 /* If not doing DAD on this address, just keep it. */
2693 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2694 idev->cnf.accept_dad <= 0 ||
2695 (ifa->flags & IFA_F_NODAD))
2696 continue;
2697
2698 /* If it was tentative already, no need to notify */
2699 if (ifa->flags & IFA_F_TENTATIVE)
2700 continue;
2701
2702 /* Flag it for later restoration when link comes up */
2703 ifa->flags |= IFA_F_TENTATIVE;
2704 in6_ifa_hold(ifa);
dc2b99f7 2705 } else {
502a2ffd 2706 list_del(&ifa->if_list);
dc2b99f7 2707 ifa->dead = 1;
84e8b803 2708 }
2709 write_unlock_bh(&idev->lock);
1da177e4 2710
c2e21293 2711 /* clear hash table */
5c578aed 2712 spin_lock_bh(&addrconf_hash_lock);
2713 hlist_del_init_rcu(&ifa->addr_lst);
c2e21293 2714 __in6_ifa_put(ifa);
5c578aed 2715 spin_unlock_bh(&addrconf_hash_lock);
c2e21293 2716
84e8b803 2717 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2718 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2719 in6_ifa_put(ifa);
dc2b99f7 2720
84e8b803 2721 write_lock_bh(&idev->lock);
1da177e4 2722 }
8f37ada5 2723
502a2ffd 2724 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2725
1da177e4
LT		 2726 write_unlock_bh(&idev->lock);
2727
2728 /* Step 5: Discard multicast list */
439e2385 2729 if (how)
1da177e4
LT		 2730 ipv6_mc_destroy_dev(idev);
2731 else
2732 ipv6_mc_down(idev);
2733
1da177e4 2734 idev->tstamp = jiffies;
1ab1457c 2735
bcdd553f 2736 /* Last: Shot the device (if unregistered) */
439e2385 2737 if (how) {
408c4768 2738 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2739 neigh_parms_release(&nd_tbl, idev->nd_parms);
2740 neigh_ifdown(&nd_tbl, dev);
2741 in6_dev_put(idev);
2742 }
2743 return 0;
2744}
2745
2746static void addrconf_rs_timer(unsigned long data)
2747{
2748 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2749 struct inet6_dev *idev = ifp->idev;
1da177e4 2750
5b2a1953 2751 read_lock(&idev->lock);
2752 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2753 goto out;
2754
5b2a1953 2755 if (idev->cnf.forwarding)
2756 goto out;
2757
2758 /* Announcement received after solicitation was sent */
2759 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2760 goto out;
1da177e4
LT		 2761
2762 spin_lock(&ifp->lock);
5b2a1953 2763 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2764 /* The wait after the last probe can be shorter */
2765 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2766 (ifp->probes == idev->cnf.rtr_solicits) ?
2767 idev->cnf.rtr_solicit_delay :
2768 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2769 spin_unlock(&ifp->lock);
2770
5b2a1953 2771 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2772 } else {
2773 spin_unlock(&ifp->lock);
2774 /*
2775 * Note: we do not support deprecated "all on-link"
2776 * assumption any longer.
2777 */
2778 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2779 idev->dev->name);
1da177e4
LT		 2780 }
2781
2782out:
5b2a1953 2783 read_unlock(&idev->lock);
1da177e4
LT		 2784 in6_ifa_put(ifp);
2785}
2786
2787/*
2788 * Duplicate Address Detection
2789 */
3c21edbd
YH		 2790static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2791{
2792 unsigned long rand_num;
2793 struct inet6_dev *idev = ifp->idev;
2794
95c385b4
NH		 2795 if (ifp->flags & IFA_F_OPTIMISTIC)
2796 rand_num = 0;
2797 else
2798 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2799
3c21edbd
YH		 2800 ifp->probes = idev->cnf.dad_transmits;
2801 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2802}
2803
e431b8c0 2804static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2805{
2806 struct inet6_dev *idev = ifp->idev;
2807 struct net_device *dev = idev->dev;
1da177e4
LT		 2808
2809 addrconf_join_solict(dev, &ifp->addr);
2810
1da177e4 2811 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2812
2813 read_lock_bh(&idev->lock);
2814 if (ifp->dead)
2815 goto out;
1da177e4 2816
21809faf 2817 spin_lock(&ifp->lock);
1da177e4 2818 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2819 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2820 !(ifp->flags&IFA_F_TENTATIVE) ||
2821 ifp->flags & IFA_F_NODAD) {
cc411d0b 2822 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2823 spin_unlock(&ifp->lock);
1da177e4
LT		 2824 read_unlock_bh(&idev->lock);
2825
2826 addrconf_dad_completed(ifp);
2827 return;
2828 }
2829
6732bade 2830 if (!(idev->if_flags & IF_READY)) {
21809faf 2831 spin_unlock(&ifp->lock);
6732bade 2832 read_unlock_bh(&idev->lock);
3c21edbd 2833 /*
590a9887 2834 * If the device is not ready:
3c21edbd
YH		 2835 * - keep it tentative if it is a permanent address.
2836 * - otherwise, kill it.
2837 */
2838 in6_ifa_hold(ifp);
cc411d0b 2839 addrconf_dad_stop(ifp, 0);
6732bade 2840 return;
3c21edbd 2841 }
95c385b4
NH		 2842
2843 /*
2844 * Optimistic nodes can start receiving
2845 * Frames right away
2846 */
e21e8467 2847 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2848 ip6_ins_rt(ifp->rt);
2849
6732bade 2850 addrconf_dad_kick(ifp);
21809faf 2851 spin_unlock(&ifp->lock);
1da177e4
LT		 2852out:
2853 read_unlock_bh(&idev->lock);
2854}
2855
2856static void addrconf_dad_timer(unsigned long data)
2857{
2858 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2859 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2860 struct in6_addr mcaddr;
2861
122e4519 2862 read_lock(&idev->lock);
2863 if (idev->dead || !(idev->if_flags & IF_READY)) {
2864 read_unlock(&idev->lock);
1da177e4
LT		 2865 goto out;
2866 }
21809faf 2867
2868 spin_lock(&ifp->lock);
1da177e4
LT		 2869 if (ifp->probes == 0) {
2870 /*
2871 * DAD was successful
2872 */
2873
cc411d0b 2874 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2875 spin_unlock(&ifp->lock);
122e4519 2876 read_unlock(&idev->lock);
1da177e4
LT		 2877
2878 addrconf_dad_completed(ifp);
2879
2880 goto out;
2881 }
2882
2883 ifp->probes--;
2884 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2885 spin_unlock(&ifp->lock);
122e4519 2886 read_unlock(&idev->lock);
1da177e4
LT		 2887
2888 /* send a neighbour solicitation for our addr */
1da177e4 2889 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2890 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2891out:
2892 in6_ifa_put(ifp);
2893}
2894
2895static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2896{
e21e8467 2897 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2898
2899 /*
2900 * Configure the address for reception. Now it is valid.
2901 */
2902
2903 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2904
2905 /* If added prefix is link local and forwarding is off,
2906 start sending router solicitations.
2907 */
2908
2909 if (ifp->idev->cnf.forwarding == 0 &&
2910 ifp->idev->cnf.rtr_solicits > 0 &&
2911 (dev->flags&IFF_LOOPBACK) == 0 &&
2912 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2913 /*
2914 * If a host as already performed a random delay
2915 * [...] as part of DAD [...] there is no need
2916 * to delay again before sending the first RS
2917 */
f3ee4010 2918 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2919
2920 spin_lock_bh(&ifp->lock);
2921 ifp->probes = 1;
2922 ifp->idev->if_flags |= IF_RS_SENT;
2923 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2924 spin_unlock_bh(&ifp->lock);
2925 }
2926}
2927
e21e8467
SH		 2928static void addrconf_dad_run(struct inet6_dev *idev)
2929{
c5e33bdd
YH		 2930 struct inet6_ifaddr *ifp;
2931
2932 read_lock_bh(&idev->lock);
502a2ffd 2933 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2934 spin_lock(&ifp->lock);
c5e33bdd 2935 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2936 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2937 continue;
2938 }
21809faf 2939 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2940 addrconf_dad_kick(ifp);
2941 }
2942 read_unlock_bh(&idev->lock);
2943}
2944
1da177e4
LT		 2945#ifdef CONFIG_PROC_FS
2946struct if6_iter_state {
3c40090a 2947 struct seq_net_private p;
1da177e4
LT		 2948 int bucket;
2949};
2950
2951static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2952{
2953 struct inet6_ifaddr *ifa = NULL;
2954 struct if6_iter_state *state = seq->private;
1218854a 2955 struct net *net = seq_file_net(seq);
1da177e4
LT		 2956
2957 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 2958 struct hlist_node *n;
5c578aed 2959 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2960 addr_lst)
c2e21293 2961 if (net_eq(dev_net(ifa->idev->dev), net))
2962 return ifa;
1da177e4 2963 }
c2e21293 2964 return NULL;
1da177e4
LT		 2965}
2966
c2e21293 2967static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2968 struct inet6_ifaddr *ifa)
1da177e4
LT		 2969{
2970 struct if6_iter_state *state = seq->private;
1218854a 2971 struct net *net = seq_file_net(seq);
c2e21293 2972 struct hlist_node *n = &ifa->addr_lst;
1da177e4 2973
5c578aed 2974 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
c2e21293 2975 if (net_eq(dev_net(ifa->idev->dev), net))
2976 return ifa;
3c40090a 2977
c2e21293 2978 while (++state->bucket < IN6_ADDR_HSIZE) {
2979 hlist_for_each_entry(ifa, n,
2980 &inet6_addr_lst[state->bucket], addr_lst) {
2981 if (net_eq(dev_net(ifa->idev->dev), net))
2982 return ifa;
2983 }
1da177e4 2984 }
3c40090a 2985
c2e21293 2986 return NULL;
1da177e4
LT		 2987}
2988
2989static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2990{
2991 struct inet6_ifaddr *ifa = if6_get_first(seq);
2992
2993 if (ifa)
e21e8467 2994 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 2995 --pos;
2996 return pos ? NULL : ifa;
2997}
2998
2999static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
5c578aed 3000 __acquires(rcu)
1da177e4 3001{
5c578aed 3002 rcu_read_lock_bh();
1da177e4
LT		 3003 return if6_get_idx(seq, *pos);
3004}
3005
3006static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3007{
3008 struct inet6_ifaddr *ifa;
3009
3010 ifa = if6_get_next(seq, v);
3011 ++*pos;
3012 return ifa;
3013}
3014
3015static void if6_seq_stop(struct seq_file *seq, void *v)
5c578aed 3016 __releases(rcu)
1da177e4 3017{
5c578aed 3018 rcu_read_unlock_bh();
1da177e4
LT		 3019}
3020
3021static int if6_seq_show(struct seq_file *seq, void *v)
3022{
3023 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3024 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3025 &ifp->addr,
1da177e4
LT		 3026 ifp->idev->dev->ifindex,
3027 ifp->prefix_len,
3028 ifp->scope,
3029 ifp->flags,
3030 ifp->idev->dev->name);
3031 return 0;
3032}
3033
56b3d975 3034static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3035 .start = if6_seq_start,
3036 .next = if6_seq_next,
3037 .show = if6_seq_show,
3038 .stop = if6_seq_stop,
3039};
3040
3041static int if6_seq_open(struct inode *inode, struct file *file)
3042{
3c40090a
DL		 3043 return seq_open_net(inode, file, &if6_seq_ops,
3044 sizeof(struct if6_iter_state));
1da177e4
LT		 3045}
3046
9a32144e 3047static const struct file_operations if6_fops = {
1da177e4
LT		 3048 .owner = THIS_MODULE,
3049 .open = if6_seq_open,
3050 .read = seq_read,
3051 .llseek = seq_lseek,
3c40090a 3052 .release = seq_release_net,
1da177e4
LT		 3053};
3054
2c8c1e72 3055static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3056{
3c40090a 3057 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3058 return -ENOMEM;
3059 return 0;
3060}
3061
2c8c1e72 3062static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3063{
3064 proc_net_remove(net, "if_inet6");
3065}
3066
3067static struct pernet_operations if6_proc_net_ops = {
3068 .init = if6_proc_net_init,
3069 .exit = if6_proc_net_exit,
3070};
3071
3072int __init if6_proc_init(void)
3073{
3074 return register_pernet_subsys(&if6_proc_net_ops);
3075}
3076
1da177e4
LT		 3077void if6_proc_exit(void)
3078{
3c40090a 3079 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3080}
3081#endif /* CONFIG_PROC_FS */
3082
59fbb3a6 3083#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3084/* Check if address is a home address configured on any interface. */
389f6612 3085int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3086{
3087 int ret = 0;
c2e21293 3088 struct inet6_ifaddr *ifp = NULL;
3089 struct hlist_node *n;
3a88a81d 3090 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3091
5c578aed 3092 rcu_read_lock_bh();
3093 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3094 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3095 continue;
caad295f 3096 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3097 (ifp->flags & IFA_F_HOMEADDRESS)) {
3098 ret = 1;
3099 break;
3100 }
3101 }
5c578aed 3102 rcu_read_unlock_bh();
3b9f9a1c
NT		 3103 return ret;
3104}
3105#endif
3106
1da177e4
LT		 3107/*
3108 * Periodic address status verification
3109 */
3110
3111static void addrconf_verify(unsigned long foo)
3112{
b2db7564 3113 unsigned long now, next, next_sec, next_sched;
1da177e4 3114 struct inet6_ifaddr *ifp;
c2e21293 3115 struct hlist_node *node;
1da177e4
LT		 3116 int i;
3117
5c578aed 3118 rcu_read_lock_bh();
3119 spin_lock(&addrconf_verify_lock);
1da177e4 3120 now = jiffies;
b2db7564 3121 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3122
3123 del_timer(&addr_chk_timer);
3124
bcdd553f 3125 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3126restart:
5c578aed 3127 hlist_for_each_entry_rcu(ifp, node,
3128 &inet6_addr_lst[i], addr_lst) {
1da177e4 3129 unsigned long age;
1da177e4
LT		 3130
3131 if (ifp->flags & IFA_F_PERMANENT)
3132 continue;
3133
3134 spin_lock(&ifp->lock);
b2db7564
YH		 3135 /* We try to batch several events at once. */
3136 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3137
8f27ebb9
YH		 3138 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3139 age >= ifp->valid_lft) {
1da177e4
LT		 3140 spin_unlock(&ifp->lock);
3141 in6_ifa_hold(ifp);
1da177e4
LT		 3142 ipv6_del_addr(ifp);
3143 goto restart;
8f27ebb9
YH		 3144 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3145 spin_unlock(&ifp->lock);
3146 continue;
1da177e4 3147 } else if (age >= ifp->prefered_lft) {
a1ed0526 3148 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3149 int deprecate = 0;
3150
3151 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3152 deprecate = 1;
3153 ifp->flags |= IFA_F_DEPRECATED;
3154 }
3155
3156 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3157 next = ifp->tstamp + ifp->valid_lft * HZ;
3158
3159 spin_unlock(&ifp->lock);
3160
3161 if (deprecate) {
3162 in6_ifa_hold(ifp);
1da177e4
LT		 3163
3164 ipv6_ifa_notify(0, ifp);
3165 in6_ifa_put(ifp);
3166 goto restart;
3167 }
3168#ifdef CONFIG_IPV6_PRIVACY
3169 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3170 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3171 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3172 ifp->idev->cnf.dad_transmits *
3173 ifp->idev->nd_parms->retrans_time / HZ;
3174
1da177e4
LT		 3175 if (age >= ifp->prefered_lft - regen_advance) {
3176 struct inet6_ifaddr *ifpub = ifp->ifpub;
3177 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3178 next = ifp->tstamp + ifp->prefered_lft * HZ;
3179 if (!ifp->regen_count && ifpub) {
3180 ifp->regen_count++;
3181 in6_ifa_hold(ifp);
3182 in6_ifa_hold(ifpub);
3183 spin_unlock(&ifp->lock);
5c578aed 3184
291d809b
HY		 3185 spin_lock(&ifpub->lock);
3186 ifpub->regen_count = 0;
3187 spin_unlock(&ifpub->lock);
1da177e4
LT		 3188 ipv6_create_tempaddr(ifpub, ifp);
3189 in6_ifa_put(ifpub);
3190 in6_ifa_put(ifp);
3191 goto restart;
3192 }
3193 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3194 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3195 spin_unlock(&ifp->lock);
3196#endif
3197 } else {
3198 /* ifp->prefered_lft <= ifp->valid_lft */
3199 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3200 next = ifp->tstamp + ifp->prefered_lft * HZ;
3201 spin_unlock(&ifp->lock);
3202 }
3203 }
1da177e4
LT		 3204 }
3205
b2db7564
YH		 3206 next_sec = round_jiffies_up(next);
3207 next_sched = next;
3208
3209 /* If rounded timeout is accurate enough, accept it. */
3210 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3211 next_sched = next_sec;
3212
3213 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3214 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3215 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3216
3217 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3218 now, next, next_sec, next_sched));
3219
3220 addr_chk_timer.expires = next_sched;
1da177e4 3221 add_timer(&addr_chk_timer);
5c578aed 3222 spin_unlock(&addrconf_verify_lock);
3223 rcu_read_unlock_bh();
1da177e4
LT		 3224}
3225
461d8837
TG		 3226static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3227{
3228 struct in6_addr *pfx = NULL;
3229
3230 if (addr)
3231 pfx = nla_data(addr);
3232
3233 if (local) {
3234 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3235 pfx = NULL;
3236 else
3237 pfx = nla_data(local);
3238 }
3239
3240 return pfx;
3241}
3242
ef7c79ed 3243static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3244 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3245 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3246 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3247};
3248
1da177e4
LT		 3249static int
3250inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3251{
3b1e0a65 3252 struct net *net = sock_net(skb->sk);
b933f716
TG		 3253 struct ifaddrmsg *ifm;
3254 struct nlattr *tb[IFA_MAX+1];
1da177e4 3255 struct in6_addr *pfx;
b933f716 3256 int err;
1da177e4 3257
b933f716
TG		 3258 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3259 if (err < 0)
3260 return err;
3261
3262 ifm = nlmsg_data(nlh);
3263 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3264 if (pfx == NULL)
3265 return -EINVAL;
3266
af284937 3267 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3268}
3269
55ebaef1
NT		 3270static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3271 u32 prefered_lft, u32 valid_lft)
081bba5b 3272{
6f704992
YH		 3273 u32 flags;
3274 clock_t expires;
4bed72e4 3275 unsigned long timeout;
46d48046 3276
081bba5b
NT		 3277 if (!valid_lft || (prefered_lft > valid_lft))
3278 return -EINVAL;
3279
4bed72e4
YH		 3280 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3281 if (addrconf_finite_timeout(timeout)) {
3282 expires = jiffies_to_clock_t(timeout * HZ);
3283 valid_lft = timeout;
6f704992 3284 flags = RTF_EXPIRES;
4bed72e4
YH		 3285 } else {
3286 expires = 0;
3287 flags = 0;
3288 ifa_flags |= IFA_F_PERMANENT;
6f704992 3289 }
081bba5b 3290
4bed72e4
YH		 3291 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3292 if (addrconf_finite_timeout(timeout)) {
3293 if (timeout == 0)
3294 ifa_flags |= IFA_F_DEPRECATED;
3295 prefered_lft = timeout;
3296 }
081bba5b
NT		 3297
3298 spin_lock_bh(&ifp->lock);
3b9f9a1c 3299 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3300 ifp->tstamp = jiffies;
3301 ifp->valid_lft = valid_lft;
3302 ifp->prefered_lft = prefered_lft;
3303
3304 spin_unlock_bh(&ifp->lock);
3305 if (!(ifp->flags&IFA_F_TENTATIVE))
3306 ipv6_ifa_notify(0, ifp);
081bba5b 3307
46d48046 3308 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3309 expires, flags);
081bba5b
NT		 3310 addrconf_verify(0);
3311
3312 return 0;
3313}
3314
1da177e4
LT		 3315static int
3316inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3317{
3b1e0a65 3318 struct net *net = sock_net(skb->sk);
461d8837
TG		 3319 struct ifaddrmsg *ifm;
3320 struct nlattr *tb[IFA_MAX+1];
1da177e4 3321 struct in6_addr *pfx;
7198f8ce
TG		 3322 struct inet6_ifaddr *ifa;
3323 struct net_device *dev;
55ebaef1
NT		 3324 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3325 u8 ifa_flags;
461d8837 3326 int err;
1da177e4 3327
461d8837
TG		 3328 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3329 if (err < 0)
3330 return err;
3331
3332 ifm = nlmsg_data(nlh);
3333 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3334 if (pfx == NULL)
3335 return -EINVAL;
3336
461d8837 3337 if (tb[IFA_CACHEINFO]) {
0778769d 3338 struct ifa_cacheinfo *ci;
461d8837
TG		 3339
3340 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3341 valid_lft = ci->ifa_valid;
461d8837
TG		 3342 preferred_lft = ci->ifa_prefered;
3343 } else {
3344 preferred_lft = INFINITY_LIFE_TIME;
3345 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3346 }
3347
af284937 3348 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3349 if (dev == NULL)
3350 return -ENODEV;
3351
55ebaef1 3352 /* We ignore other flags so far. */
3b9f9a1c 3353 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3354
1cab3da6 3355 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3356 if (ifa == NULL) {
3357 /*
3358 * It would be best to check for !NLM_F_CREATE here but
3359 * userspace alreay relies on not having to provide this.
3360 */
af284937
DL		 3361 return inet6_addr_add(net, ifm->ifa_index, pfx,
3362 ifm->ifa_prefixlen, ifa_flags,
3363 preferred_lft, valid_lft);
081bba5b
NT		 3364 }
3365
7198f8ce
TG		 3366 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3367 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3368 err = -EEXIST;
3369 else
55ebaef1 3370 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3371
3372 in6_ifa_put(ifa);
3373
3374 return err;
1da177e4
LT		 3375}
3376
101bb229
TG		 3377static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3378 u8 scope, int ifindex)
3379{
3380 struct ifaddrmsg *ifm;
3381
3382 ifm = nlmsg_data(nlh);
3383 ifm->ifa_family = AF_INET6;
3384 ifm->ifa_prefixlen = prefixlen;
3385 ifm->ifa_flags = flags;
3386 ifm->ifa_scope = scope;
3387 ifm->ifa_index = ifindex;
3388}
3389
85486af0
TG		 3390static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3391 unsigned long tstamp, u32 preferred, u32 valid)
3392{
3393 struct ifa_cacheinfo ci;
3394
3395 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3396 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3397 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3398 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3399 ci.ifa_prefered = preferred;
3400 ci.ifa_valid = valid;
3401
3402 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3403}
3404
101bb229
TG		 3405static inline int rt_scope(int ifa_scope)
3406{
3407 if (ifa_scope & IFA_HOST)
3408 return RT_SCOPE_HOST;
3409 else if (ifa_scope & IFA_LINK)
3410 return RT_SCOPE_LINK;
3411 else if (ifa_scope & IFA_SITE)
3412 return RT_SCOPE_SITE;
3413 else
3414 return RT_SCOPE_UNIVERSE;
3415}
3416
0ab6803b
TG		 3417static inline int inet6_ifaddr_msgsize(void)
3418{
339bf98f
TG		 3419 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3420 + nla_total_size(16) /* IFA_ADDRESS */
3421 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3422}
c5396a31 3423
1da177e4 3424static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3425 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3426{
1da177e4 3427 struct nlmsghdr *nlh;
85486af0 3428 u32 preferred, valid;
1da177e4 3429
0ab6803b
TG		 3430 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3431 if (nlh == NULL)
26932566 3432 return -EMSGSIZE;
0ab6803b 3433
101bb229
TG		 3434 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3435 ifa->idev->dev->ifindex);
3436
1da177e4 3437 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3438 preferred = ifa->prefered_lft;
3439 valid = ifa->valid_lft;
3440 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3441 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3442 if (preferred > tval)
3443 preferred -= tval;
3444 else
3445 preferred = 0;
85486af0
TG		 3446 if (valid != INFINITY_LIFE_TIME)
3447 valid -= tval;
1da177e4
LT		 3448 }
3449 } else {
85486af0
TG		 3450 preferred = INFINITY_LIFE_TIME;
3451 valid = INFINITY_LIFE_TIME;
3452 }
3453
0ab6803b 3454 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3455 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3456 nlmsg_cancel(skb, nlh);
3457 return -EMSGSIZE;
3458 }
1da177e4 3459
0ab6803b 3460 return nlmsg_end(skb, nlh);
1da177e4
LT		 3461}
3462
3463static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3464 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3465{
1da177e4 3466 struct nlmsghdr *nlh;
101bb229
TG		 3467 u8 scope = RT_SCOPE_UNIVERSE;
3468 int ifindex = ifmca->idev->dev->ifindex;
3469
3470 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3471 scope = RT_SCOPE_SITE;
1da177e4 3472
0ab6803b
TG		 3473 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3474 if (nlh == NULL)
26932566 3475 return -EMSGSIZE;
85486af0 3476
0ab6803b
TG		 3477 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3478 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3479 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3480 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3481 nlmsg_cancel(skb, nlh);
3482 return -EMSGSIZE;
3483 }
85486af0 3484
0ab6803b 3485 return nlmsg_end(skb, nlh);
1da177e4
LT		 3486}
3487
3488static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3489 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3490{
1da177e4 3491 struct nlmsghdr *nlh;
101bb229
TG		 3492 u8 scope = RT_SCOPE_UNIVERSE;
3493 int ifindex = ifaca->aca_idev->dev->ifindex;
3494
3495 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3496 scope = RT_SCOPE_SITE;
1da177e4 3497
0ab6803b
TG		 3498 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3499 if (nlh == NULL)
26932566 3500 return -EMSGSIZE;
85486af0 3501
0ab6803b
TG		 3502 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3503 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3504 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3505 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3506 nlmsg_cancel(skb, nlh);
3507 return -EMSGSIZE;
3508 }
1da177e4 3509
0ab6803b 3510 return nlmsg_end(skb, nlh);
1da177e4
LT		 3511}
3512
e21e8467 3513enum addr_type_t {
1da177e4
LT		 3514 UNICAST_ADDR,
3515 MULTICAST_ADDR,
3516 ANYCAST_ADDR,
3517};
3518
234b27c3
ED		 3519/* called with rcu_read_lock() */
3520static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3521 struct netlink_callback *cb, enum addr_type_t type,
3522 int s_ip_idx, int *p_ip_idx)
3523{
234b27c3
ED		 3524 struct ifmcaddr6 *ifmca;
3525 struct ifacaddr6 *ifaca;
3526 int err = 1;
3527 int ip_idx = *p_ip_idx;
3528
3529 read_lock_bh(&idev->lock);
3530 switch (type) {
502a2ffd 3531 case UNICAST_ADDR: {
3532 struct inet6_ifaddr *ifa;
3533
234b27c3 3534 /* unicast address incl. temp addr */
502a2ffd 3535 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3536 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3537 continue;
3538 err = inet6_fill_ifaddr(skb, ifa,
3539 NETLINK_CB(cb->skb).pid,
3540 cb->nlh->nlmsg_seq,
3541 RTM_NEWADDR,
3542 NLM_F_MULTI);
3543 if (err <= 0)
3544 break;
3545 }
3546 break;
502a2ffd 3547 }
234b27c3
ED		 3548 case MULTICAST_ADDR:
3549 /* multicast address */
3550 for (ifmca = idev->mc_list; ifmca;
3551 ifmca = ifmca->next, ip_idx++) {
3552 if (ip_idx < s_ip_idx)
3553 continue;
3554 err = inet6_fill_ifmcaddr(skb, ifmca,
3555 NETLINK_CB(cb->skb).pid,
3556 cb->nlh->nlmsg_seq,
3557 RTM_GETMULTICAST,
3558 NLM_F_MULTI);
3559 if (err <= 0)
3560 break;
3561 }
3562 break;
3563 case ANYCAST_ADDR:
3564 /* anycast address */
3565 for (ifaca = idev->ac_list; ifaca;
3566 ifaca = ifaca->aca_next, ip_idx++) {
3567 if (ip_idx < s_ip_idx)
3568 continue;
3569 err = inet6_fill_ifacaddr(skb, ifaca,
3570 NETLINK_CB(cb->skb).pid,
3571 cb->nlh->nlmsg_seq,
3572 RTM_GETANYCAST,
3573 NLM_F_MULTI);
3574 if (err <= 0)
3575 break;
3576 }
3577 break;
3578 default:
3579 break;
3580 }
3581 read_unlock_bh(&idev->lock);
3582 *p_ip_idx = ip_idx;
3583 return err;
3584}
3585
1da177e4
LT		 3586static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3587 enum addr_type_t type)
3588{
234b27c3
ED		 3589 struct net *net = sock_net(skb->sk);
3590 int h, s_h;
1da177e4
LT		 3591 int idx, ip_idx;
3592 int s_idx, s_ip_idx;
1da177e4 3593 struct net_device *dev;
234b27c3
ED		 3594 struct inet6_dev *idev;
3595 struct hlist_head *head;
3596 struct hlist_node *node;
1ab1457c 3597
234b27c3
ED		 3598 s_h = cb->args[0];
3599 s_idx = idx = cb->args[1];
3600 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3601
234b27c3
ED		 3602 rcu_read_lock();
3603 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3604 idx = 0;
3605 head = &net->dev_index_head[h];
3606 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3607 if (idx < s_idx)
3608 goto cont;
3609 if (idx > s_idx)
3610 s_ip_idx = 0;
3611 ip_idx = 0;
e21e8467
SH		 3612 idev = __in6_dev_get(dev);
3613 if (!idev)
234b27c3
ED		 3614 goto cont;
3615
3616 if (in6_dump_addrs(idev, skb, cb, type,
3617 s_ip_idx, &ip_idx) <= 0)
3618 goto done;
7562f876 3619cont:
234b27c3
ED		 3620 idx++;
3621 }
1da177e4 3622 }
234b27c3
ED		 3623done:
3624 rcu_read_unlock();
3625 cb->args[0] = h;
3626 cb->args[1] = idx;
3627 cb->args[2] = ip_idx;
3628
1da177e4
LT		 3629 return skb->len;
3630}
3631
3632static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3633{
3634 enum addr_type_t type = UNICAST_ADDR;
b854272b 3635
1da177e4
LT		 3636 return inet6_dump_addr(skb, cb, type);
3637}
3638
3639static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3640{
3641 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3642
1da177e4
LT		 3643 return inet6_dump_addr(skb, cb, type);
3644}
3645
3646
3647static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3648{
3649 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3650
1da177e4
LT		 3651 return inet6_dump_addr(skb, cb, type);
3652}
3653
1b29fc2c
TG		 3654static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3655 void *arg)
6c223828 3656{
3b1e0a65 3657 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3658 struct ifaddrmsg *ifm;
3659 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3660 struct in6_addr *addr = NULL;
3661 struct net_device *dev = NULL;
3662 struct inet6_ifaddr *ifa;
3663 struct sk_buff *skb;
6c223828
NT		 3664 int err;
3665
1b29fc2c
TG		 3666 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3667 if (err < 0)
3668 goto errout;
3669
3670 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3671 if (addr == NULL) {
3672 err = -EINVAL;
3673 goto errout;
6c223828 3674 }
6c223828 3675
1b29fc2c 3676 ifm = nlmsg_data(nlh);
6c223828 3677 if (ifm->ifa_index)
6fda7350 3678 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3679
e21e8467
SH		 3680 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3681 if (!ifa) {
1b29fc2c
TG		 3682 err = -EADDRNOTAVAIL;
3683 goto errout;
3684 }
6c223828 3685
e21e8467
SH		 3686 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3687 if (!skb) {
6c223828 3688 err = -ENOBUFS;
1b29fc2c 3689 goto errout_ifa;
6c223828
NT		 3690 }
3691
6c223828
NT		 3692 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3693 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3694 if (err < 0) {
3695 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3696 WARN_ON(err == -EMSGSIZE);
3697 kfree_skb(skb);
3698 goto errout_ifa;
3699 }
6fda7350 3700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3701errout_ifa:
6c223828 3702 in6_ifa_put(ifa);
1b29fc2c 3703errout:
6c223828 3704 return err;
6c223828
NT		 3705}
3706
1da177e4
LT		 3707static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3708{
3709 struct sk_buff *skb;
c346dca1 3710 struct net *net = dev_net(ifa->idev->dev);
5d620266 3711 int err = -ENOBUFS;
1da177e4 3712
0ab6803b 3713 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3714 if (skb == NULL)
3715 goto errout;
3716
3717 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3718 if (err < 0) {
3719 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3720 WARN_ON(err == -EMSGSIZE);
3721 kfree_skb(skb);
3722 goto errout;
3723 }
1ce85fe4
PNA		 3724 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3725 return;
5d620266
TG		 3726errout:
3727 if (err < 0)
6fda7350 3728 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3729}
3730
b6f99a21 3731static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3732 __s32 *array, int bytes)
3733{
04561c1f
TG		 3734 BUG_ON(bytes < (DEVCONF_MAX * 4));
3735
1da177e4
LT		 3736 memset(array, 0, bytes);
3737 array[DEVCONF_FORWARDING] = cnf->forwarding;
3738 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3739 array[DEVCONF_MTU6] = cnf->mtu6;
3740 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3741 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3742 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3743 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3744 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3745 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3746 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3747 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3748#ifdef CONFIG_IPV6_PRIVACY
3749 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3750 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3751 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3752 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3753 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3754#endif
3755 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3756 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3757 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3758#ifdef CONFIG_IPV6_ROUTER_PREF
3759 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3760 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3761#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3762 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3763#endif
930d6ff2 3764#endif
fbea49e1 3765 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3766 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3767#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3768 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3769#endif
7bc570c8
YH		 3770#ifdef CONFIG_IPV6_MROUTE
3771 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3772#endif
778d80be 3773 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3774 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3775 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3776}
3777
339bf98f
TG		 3778static inline size_t inet6_if_nlmsg_size(void)
3779{
3780 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3781 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3782 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3783 + nla_total_size(4) /* IFLA_MTU */
3784 + nla_total_size(4) /* IFLA_LINK */
3785 + nla_total_size( /* IFLA_PROTINFO */
3786 nla_total_size(4) /* IFLA_INET6_FLAGS */
3787 + nla_total_size(sizeof(struct ifla_cacheinfo))
3788 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3789 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3790 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3791 );
3792}
c5396a31 3793
7d720c3e
TH		 3794static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3795 int items, int bytes)
7f7d9a6b
HX		 3796{
3797 int i;
3798 int pad = bytes - sizeof(u64) * items;
3799 BUG_ON(pad < 0);
3800
3801 /* Use put_unaligned() because stats may not be aligned for u64. */
3802 put_unaligned(items, &stats[0]);
3803 for (i = 1; i < items; i++)
3804 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3805
3806 memset(&stats[items], 0, pad);
3807}
3808
3809static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3810 int bytes)
3811{
e21e8467 3812 switch (attrtype) {
7f7d9a6b 3813 case IFLA_INET6_STATS:
7d720c3e 3814 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3815 break;
3816 case IFLA_INET6_ICMP6STATS:
7d720c3e 3817 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3818 break;
3819 }
3820}
3821
1ab1457c 3822static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3823 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3824{
04561c1f 3825 struct net_device *dev = idev->dev;
bf99f1bd 3826 struct nlattr *nla;
04561c1f
TG		 3827 struct ifinfomsg *hdr;
3828 struct nlmsghdr *nlh;
3829 void *protoinfo;
3830 struct ifla_cacheinfo ci;
3831
3832 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3833 if (nlh == NULL)
26932566 3834 return -EMSGSIZE;
04561c1f
TG		 3835
3836 hdr = nlmsg_data(nlh);
3837 hdr->ifi_family = AF_INET6;
3838 hdr->__ifi_pad = 0;
3839 hdr->ifi_type = dev->type;
3840 hdr->ifi_index = dev->ifindex;
3841 hdr->ifi_flags = dev_get_flags(dev);
3842 hdr->ifi_change = 0;
3843
3844 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3845
3846 if (dev->addr_len)
04561c1f 3847 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3848
04561c1f 3849 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3850 if (dev->ifindex != dev->iflink)
04561c1f 3851 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3852
04561c1f
TG		 3853 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3854 if (protoinfo == NULL)
3855 goto nla_put_failure;
1da177e4 3856
04561c1f 3857 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3858
1da177e4
LT		 3859 ci.max_reasm_len = IPV6_MAXPLEN;
3860 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3861 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3862 ci.reachable_time = idev->nd_parms->reachable_time;
3863 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3864 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3865
bf99f1bd
YH		 3866 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3867 if (nla == NULL)
04561c1f 3868 goto nla_put_failure;
bf99f1bd 3869 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3870
bf99f1bd
YH		 3871 /* XXX - MC not implemented */
3872
3873 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3874 if (nla == NULL)
3875 goto nla_put_failure;
3876 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3877
3878 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3879 if (nla == NULL)
3880 goto nla_put_failure;
3881 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3882
04561c1f
TG		 3883 nla_nest_end(skb, protoinfo);
3884 return nlmsg_end(skb, nlh);
1da177e4 3885
04561c1f 3886nla_put_failure:
26932566
PM		 3887 nlmsg_cancel(skb, nlh);
3888 return -EMSGSIZE;
1da177e4
LT		 3889}
3890
3891static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3892{
3b1e0a65 3893 struct net *net = sock_net(skb->sk);
84d2697d 3894 int h, s_h;
434a8a58 3895 int idx = 0, s_idx;
1da177e4
LT		 3896 struct net_device *dev;
3897 struct inet6_dev *idev;
84d2697d
ED		 3898 struct hlist_head *head;
3899 struct hlist_node *node;
1da177e4 3900
84d2697d
ED		 3901 s_h = cb->args[0];
3902 s_idx = cb->args[1];
3903
3904 rcu_read_lock();
3905 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3906 idx = 0;
3907 head = &net->dev_index_head[h];
3908 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3909 if (idx < s_idx)
3910 goto cont;
3911 idev = __in6_dev_get(dev);
3912 if (!idev)
3913 goto cont;
3914 if (inet6_fill_ifinfo(skb, idev,
3915 NETLINK_CB(cb->skb).pid,
3916 cb->nlh->nlmsg_seq,
3917 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3918 goto out;
7562f876 3919cont:
84d2697d
ED		 3920 idx++;
3921 }
1da177e4 3922 }
84d2697d
ED		 3923out:
3924 rcu_read_unlock();
3925 cb->args[1] = idx;
3926 cb->args[0] = h;
1da177e4
LT		 3927
3928 return skb->len;
3929}
3930
3931void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3932{
3933 struct sk_buff *skb;
c346dca1 3934 struct net *net = dev_net(idev->dev);
8d7a76c9 3935 int err = -ENOBUFS;
1ab1457c 3936
339bf98f 3937 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3938 if (skb == NULL)
3939 goto errout;
3940
3941 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3942 if (err < 0) {
3943 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3944 WARN_ON(err == -EMSGSIZE);
3945 kfree_skb(skb);
3946 goto errout;
3947 }
1ce85fe4
PNA		 3948 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3949 return;
8d7a76c9
TG		 3950errout:
3951 if (err < 0)
6fda7350 3952 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3953}
3954
339bf98f
TG		 3955static inline size_t inet6_prefix_nlmsg_size(void)
3956{
3957 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3958 + nla_total_size(sizeof(struct in6_addr))
3959 + nla_total_size(sizeof(struct prefix_cacheinfo));
3960}
c5396a31 3961
1da177e4 3962static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3963 struct prefix_info *pinfo, u32 pid, u32 seq,
3964 int event, unsigned int flags)
1da177e4 3965{
6051e2f4
TG		 3966 struct prefixmsg *pmsg;
3967 struct nlmsghdr *nlh;
1da177e4
LT		 3968 struct prefix_cacheinfo ci;
3969
6051e2f4
TG		 3970 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3971 if (nlh == NULL)
26932566 3972 return -EMSGSIZE;
6051e2f4
TG		 3973
3974 pmsg = nlmsg_data(nlh);
1da177e4 3975 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3976 pmsg->prefix_pad1 = 0;
3977 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3978 pmsg->prefix_ifindex = idev->dev->ifindex;
3979 pmsg->prefix_len = pinfo->prefix_len;
3980 pmsg->prefix_type = pinfo->type;
8a47077a 3981 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3982 pmsg->prefix_flags = 0;
3983 if (pinfo->onlink)
3984 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3985 if (pinfo->autoconf)
3986 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3987
6051e2f4 3988 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3989
3990 ci.preferred_time = ntohl(pinfo->prefered);
3991 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3992 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3993
6051e2f4 3994 return nlmsg_end(skb, nlh);
1da177e4 3995
6051e2f4 3996nla_put_failure:
26932566
PM		 3997 nlmsg_cancel(skb, nlh);
3998 return -EMSGSIZE;
1da177e4
LT		 3999}
4000
1ab1457c 4001static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4002 struct prefix_info *pinfo)
4003{
4004 struct sk_buff *skb;
c346dca1 4005 struct net *net = dev_net(idev->dev);
8c384bfa 4006 int err = -ENOBUFS;
1da177e4 4007
339bf98f 4008 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4009 if (skb == NULL)
4010 goto errout;
4011
4012 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4013 if (err < 0) {
4014 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4015 WARN_ON(err == -EMSGSIZE);
4016 kfree_skb(skb);
4017 goto errout;
4018 }
1ce85fe4
PNA		 4019 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4020 return;
8c384bfa
TG		 4021errout:
4022 if (err < 0)
6fda7350 4023 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4024}
4025
1da177e4
LT		 4026static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4027{
4028 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4029
4030 switch (event) {
4031 case RTM_NEWADDR:
95c385b4
NH		 4032 /*
4033 * If the address was optimistic
4034 * we inserted the route at the start of
4035 * our DAD process, so we don't need
4036 * to do it again
4037 */
4038 if (!(ifp->rt->rt6i_node))
4039 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4040 if (ifp->idev->cnf.forwarding)
4041 addrconf_join_anycast(ifp);
4042 break;
4043 case RTM_DELADDR:
4044 if (ifp->idev->cnf.forwarding)
4045 addrconf_leave_anycast(ifp);
4046 addrconf_leave_solict(ifp->idev, &ifp->addr);
4047 dst_hold(&ifp->rt->u.dst);
e0a1ad73 4048 if (ip6_del_rt(ifp->rt))
1da177e4 4049 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4050 break;
4051 }
4052}
4053
4054static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4055{
8814c4b5 4056 rcu_read_lock_bh();
1da177e4
LT		 4057 if (likely(ifp->idev->dead == 0))
4058 __ipv6_ifa_notify(event, ifp);
8814c4b5 4059 rcu_read_unlock_bh();
1da177e4
LT		 4060}
4061
4062#ifdef CONFIG_SYSCTL
4063
4064static
8d65af78 4065int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4066 void __user *buffer, size_t *lenp, loff_t *ppos)
4067{
4068 int *valp = ctl->data;
4069 int val = *valp;
88af182e 4070 loff_t pos = *ppos;
1da177e4
LT		 4071 int ret;
4072
8d65af78 4073 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4074
c8fecf22 4075 if (write)
b325fddb 4076 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4077 if (ret)
4078 *ppos = pos;
1ab1457c 4079 return ret;
1da177e4
LT		 4080}
4081
56d417b1
BH		 4082static void dev_disable_change(struct inet6_dev *idev)
4083{
4084 if (!idev || !idev->dev)
4085 return;
4086
4087 if (idev->cnf.disable_ipv6)
4088 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4089 else
4090 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4091}
4092
4093static void addrconf_disable_change(struct net *net, __s32 newf)
4094{
4095 struct net_device *dev;
4096 struct inet6_dev *idev;
4097
c6d14c84
ED		 4098 rcu_read_lock();
4099 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4100 idev = __in6_dev_get(dev);
4101 if (idev) {
4102 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4103 idev->cnf.disable_ipv6 = newf;
4104 if (changed)
4105 dev_disable_change(idev);
4106 }
56d417b1 4107 }
c6d14c84 4108 rcu_read_unlock();
56d417b1
BH		 4109}
4110
4111static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4112{
4113 struct net *net;
4114
4115 net = (struct net *)table->extra2;
4116
4117 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4118 return 0;
4119
88af182e
EB		 4120 if (!rtnl_trylock()) {
4121 /* Restore the original values before restarting */
4122 *p = old;
56d417b1 4123 return restart_syscall();
88af182e 4124 }
56d417b1
BH		 4125
4126 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4127 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4128 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4129 addrconf_disable_change(net, newf);
4130 } else if ((!*p) ^ (!old))
4131 dev_disable_change((struct inet6_dev *)table->extra1);
4132
4133 rtnl_unlock();
4134 return 0;
4135}
4136
4137static
8d65af78 4138int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4139 void __user *buffer, size_t *lenp, loff_t *ppos)
4140{
4141 int *valp = ctl->data;
4142 int val = *valp;
88af182e 4143 loff_t pos = *ppos;
56d417b1
BH		 4144 int ret;
4145
8d65af78 4146 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4147
4148 if (write)
4149 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4150 if (ret)
4151 *ppos = pos;
56d417b1
BH		 4152 return ret;
4153}
4154
1da177e4
LT		 4155static struct addrconf_sysctl_table
4156{
4157 struct ctl_table_header *sysctl_header;
f6a07b29 4158 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4159 char *dev_name;
ab32ea5d 4160} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4161 .sysctl_header = NULL,
4162 .addrconf_vars = {
1ab1457c 4163 {
e21e8467
SH		 4164 .procname = "forwarding",
4165 .data = &ipv6_devconf.forwarding,
4166 .maxlen = sizeof(int),
4167 .mode = 0644,
4168 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4169 },
4170 {
e21e8467
SH		 4171 .procname = "hop_limit",
4172 .data = &ipv6_devconf.hop_limit,
4173 .maxlen = sizeof(int),
4174 .mode = 0644,
4175 .proc_handler = proc_dointvec,
1da177e4
LT		 4176 },
4177 {
e21e8467
SH		 4178 .procname = "mtu",
4179 .data = &ipv6_devconf.mtu6,
4180 .maxlen = sizeof(int),
4181 .mode = 0644,
4182 .proc_handler = proc_dointvec,
1da177e4
LT		 4183 },
4184 {
e21e8467
SH		 4185 .procname = "accept_ra",
4186 .data = &ipv6_devconf.accept_ra,
4187 .maxlen = sizeof(int),
4188 .mode = 0644,
4189 .proc_handler = proc_dointvec,
1da177e4
LT		 4190 },
4191 {
e21e8467
SH		 4192 .procname = "accept_redirects",
4193 .data = &ipv6_devconf.accept_redirects,
4194 .maxlen = sizeof(int),
4195 .mode = 0644,
4196 .proc_handler = proc_dointvec,
1da177e4
LT		 4197 },
4198 {
e21e8467
SH		 4199 .procname = "autoconf",
4200 .data = &ipv6_devconf.autoconf,
4201 .maxlen = sizeof(int),
4202 .mode = 0644,
4203 .proc_handler = proc_dointvec,
1da177e4
LT		 4204 },
4205 {
e21e8467
SH		 4206 .procname = "dad_transmits",
4207 .data = &ipv6_devconf.dad_transmits,
4208 .maxlen = sizeof(int),
4209 .mode = 0644,
4210 .proc_handler = proc_dointvec,
1da177e4
LT		 4211 },
4212 {
e21e8467
SH		 4213 .procname = "router_solicitations",
4214 .data = &ipv6_devconf.rtr_solicits,
4215 .maxlen = sizeof(int),
4216 .mode = 0644,
4217 .proc_handler = proc_dointvec,
1da177e4
LT		 4218 },
4219 {
e21e8467
SH		 4220 .procname = "router_solicitation_interval",
4221 .data = &ipv6_devconf.rtr_solicit_interval,
4222 .maxlen = sizeof(int),
4223 .mode = 0644,
4224 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4225 },
4226 {
e21e8467
SH		 4227 .procname = "router_solicitation_delay",
4228 .data = &ipv6_devconf.rtr_solicit_delay,
4229 .maxlen = sizeof(int),
4230 .mode = 0644,
4231 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4232 },
4233 {
e21e8467
SH		 4234 .procname = "force_mld_version",
4235 .data = &ipv6_devconf.force_mld_version,
4236 .maxlen = sizeof(int),
4237 .mode = 0644,
4238 .proc_handler = proc_dointvec,
1da177e4
LT		 4239 },
4240#ifdef CONFIG_IPV6_PRIVACY
4241 {
e21e8467
SH		 4242 .procname = "use_tempaddr",
4243 .data = &ipv6_devconf.use_tempaddr,
4244 .maxlen = sizeof(int),
4245 .mode = 0644,
4246 .proc_handler = proc_dointvec,
1da177e4
LT		 4247 },
4248 {
e21e8467
SH		 4249 .procname = "temp_valid_lft",
4250 .data = &ipv6_devconf.temp_valid_lft,
4251 .maxlen = sizeof(int),
4252 .mode = 0644,
4253 .proc_handler = proc_dointvec,
1da177e4
LT		 4254 },
4255 {
e21e8467
SH		 4256 .procname = "temp_prefered_lft",
4257 .data = &ipv6_devconf.temp_prefered_lft,
4258 .maxlen = sizeof(int),
4259 .mode = 0644,
4260 .proc_handler = proc_dointvec,
1da177e4
LT		 4261 },
4262 {
e21e8467
SH		 4263 .procname = "regen_max_retry",
4264 .data = &ipv6_devconf.regen_max_retry,
4265 .maxlen = sizeof(int),
4266 .mode = 0644,
4267 .proc_handler = proc_dointvec,
1da177e4
LT		 4268 },
4269 {
e21e8467
SH		 4270 .procname = "max_desync_factor",
4271 .data = &ipv6_devconf.max_desync_factor,
4272 .maxlen = sizeof(int),
4273 .mode = 0644,
4274 .proc_handler = proc_dointvec,
1da177e4
LT		 4275 },
4276#endif
4277 {
e21e8467
SH		 4278 .procname = "max_addresses",
4279 .data = &ipv6_devconf.max_addresses,
4280 .maxlen = sizeof(int),
4281 .mode = 0644,
4282 .proc_handler = proc_dointvec,
1da177e4 4283 },
65f5c7c1 4284 {
e21e8467
SH		 4285 .procname = "accept_ra_defrtr",
4286 .data = &ipv6_devconf.accept_ra_defrtr,
4287 .maxlen = sizeof(int),
4288 .mode = 0644,
4289 .proc_handler = proc_dointvec,
65f5c7c1 4290 },
c4fd30eb 4291 {
e21e8467
SH		 4292 .procname = "accept_ra_pinfo",
4293 .data = &ipv6_devconf.accept_ra_pinfo,
4294 .maxlen = sizeof(int),
4295 .mode = 0644,
4296 .proc_handler = proc_dointvec,
c4fd30eb 4297 },
930d6ff2
YH		 4298#ifdef CONFIG_IPV6_ROUTER_PREF
4299 {
e21e8467
SH		 4300 .procname = "accept_ra_rtr_pref",
4301 .data = &ipv6_devconf.accept_ra_rtr_pref,
4302 .maxlen = sizeof(int),
4303 .mode = 0644,
4304 .proc_handler = proc_dointvec,
930d6ff2 4305 },
52e16356 4306 {
e21e8467
SH		 4307 .procname = "router_probe_interval",
4308 .data = &ipv6_devconf.rtr_probe_interval,
4309 .maxlen = sizeof(int),
4310 .mode = 0644,
4311 .proc_handler = proc_dointvec_jiffies,
52e16356 4312 },
fa03ef38 4313#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4314 {
e21e8467
SH		 4315 .procname = "accept_ra_rt_info_max_plen",
4316 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
4319 .proc_handler = proc_dointvec,
09c884d4
YH		 4320 },
4321#endif
930d6ff2 4322#endif
fbea49e1 4323 {
e21e8467
SH		 4324 .procname = "proxy_ndp",
4325 .data = &ipv6_devconf.proxy_ndp,
4326 .maxlen = sizeof(int),
4327 .mode = 0644,
4328 .proc_handler = proc_dointvec,
fbea49e1 4329 },
0bcbc926 4330 {
e21e8467
SH		 4331 .procname = "accept_source_route",
4332 .data = &ipv6_devconf.accept_source_route,
4333 .maxlen = sizeof(int),
4334 .mode = 0644,
4335 .proc_handler = proc_dointvec,
0bcbc926 4336 },
95c385b4
NH		 4337#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4338 {
e21e8467
SH		 4339 .procname = "optimistic_dad",
4340 .data = &ipv6_devconf.optimistic_dad,
4341 .maxlen = sizeof(int),
4342 .mode = 0644,
4343 .proc_handler = proc_dointvec,
95c385b4
NH		 4344
4345 },
7bc570c8
YH		 4346#endif
4347#ifdef CONFIG_IPV6_MROUTE
4348 {
e21e8467
SH		 4349 .procname = "mc_forwarding",
4350 .data = &ipv6_devconf.mc_forwarding,
4351 .maxlen = sizeof(int),
4352 .mode = 0444,
4353 .proc_handler = proc_dointvec,
7bc570c8 4354 },
95c385b4 4355#endif
778d80be 4356 {
e21e8467
SH		 4357 .procname = "disable_ipv6",
4358 .data = &ipv6_devconf.disable_ipv6,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = addrconf_sysctl_disable,
778d80be 4362 },
1b34be74 4363 {
e21e8467
SH		 4364 .procname = "accept_dad",
4365 .data = &ipv6_devconf.accept_dad,
4366 .maxlen = sizeof(int),
4367 .mode = 0644,
4368 .proc_handler = proc_dointvec,
1b34be74 4369 },
f7734fdf 4370 {
f7734fdf
OP		 4371 .procname = "force_tllao",
4372 .data = &ipv6_devconf.force_tllao,
4373 .maxlen = sizeof(int),
4374 .mode = 0644,
4375 .proc_handler = proc_dointvec
4376 },
1da177e4 4377 {
f8572d8f 4378 /* sentinel */
1da177e4
LT		 4379 }
4380 },
1da177e4
LT		 4381};
4382
bff16c2f 4383static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4384 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4385{
4386 int i;
1da177e4 4387 struct addrconf_sysctl_table *t;
1da177e4 4388
1dab6222
PE		 4389#define ADDRCONF_CTL_PATH_DEV 3
4390
4391 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4392 { .procname = "net", },
4393 { .procname = "ipv6", },
4394 { .procname = "conf", },
1dab6222
PE		 4395 { /* to be set */ },
4396 { },
4397 };
4398
4399
af879cc7 4400 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4401 if (t == NULL)
f68635e6
PE		 4402 goto out;
4403
bcdd553f 4404 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4405 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4406 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4407 t->addrconf_vars[i].extra2 = net;
1da177e4 4408 }
1da177e4 4409
1ab1457c
YH		 4410 /*
4411 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4412 * by sysctl and we wouldn't want anyone to change it under our feet
4413 * (see SIOCSIFNAME).
1ab1457c 4414 */
1dab6222
PE		 4415 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4416 if (!t->dev_name)
f68635e6 4417 goto free;
1da177e4 4418
1dab6222 4419 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4420
bff16c2f 4421 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4422 t->addrconf_vars);
1da177e4
LT		 4423 if (t->sysctl_header == NULL)
4424 goto free_procname;
f68635e6
PE		 4425
4426 p->sysctl = t;
95897312 4427 return 0;
1da177e4 4428
f68635e6 4429free_procname:
1dab6222 4430 kfree(t->dev_name);
f68635e6 4431free:
1da177e4 4432 kfree(t);
f68635e6 4433out:
95897312 4434 return -ENOBUFS;
1da177e4
LT		 4435}
4436
408c4768
PE		 4437static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4438{
4439 struct addrconf_sysctl_table *t;
4440
4441 if (p->sysctl == NULL)
4442 return;
4443
4444 t = p->sysctl;
4445 p->sysctl = NULL;
4446 unregister_sysctl_table(t->sysctl_header);
4447 kfree(t->dev_name);
4448 kfree(t);
4449}
4450
f52295a9
PE		 4451static void addrconf_sysctl_register(struct inet6_dev *idev)
4452{
54716e3b 4453 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4454 &ndisc_ifinfo_sysctl_change);
c346dca1 4455 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4456 idev, &idev->cnf);
f52295a9
PE		 4457}
4458
408c4768 4459static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4460{
408c4768
PE		 4461 __addrconf_sysctl_unregister(&idev->cnf);
4462 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4463}
4464
4465
4466#endif
4467
2c8c1e72 4468static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4469{
4470 int err;
4471 struct ipv6_devconf *all, *dflt;
4472
4473 err = -ENOMEM;
4474 all = &ipv6_devconf;
4475 dflt = &ipv6_devconf_dflt;
4476
09ad9bc7 4477 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4478 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4479 if (all == NULL)
4480 goto err_alloc_all;
4481
4482 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4483 if (dflt == NULL)
4484 goto err_alloc_dflt;
56d417b1
BH		 4485 } else {
4486 /* these will be inherited by all namespaces */
4487 dflt->autoconf = ipv6_defaults.autoconf;
4488 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4489 }
4490
4491 net->ipv6.devconf_all = all;
4492 net->ipv6.devconf_dflt = dflt;
4493
4494#ifdef CONFIG_SYSCTL
f8572d8f 4495 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4496 if (err < 0)
4497 goto err_reg_all;
4498
f8572d8f 4499 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4500 if (err < 0)
4501 goto err_reg_dflt;
4502#endif
4503 return 0;
4504
4505#ifdef CONFIG_SYSCTL
4506err_reg_dflt:
4507 __addrconf_sysctl_unregister(all);
4508err_reg_all:
4509 kfree(dflt);
4510#endif
4511err_alloc_dflt:
4512 kfree(all);
4513err_alloc_all:
4514 return err;
4515}
4516
2c8c1e72 4517static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4518{
4519#ifdef CONFIG_SYSCTL
4520 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4521 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4522#endif
09ad9bc7 4523 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4524 kfree(net->ipv6.devconf_dflt);
4525 kfree(net->ipv6.devconf_all);
4526 }
4527}
4528
4529static struct pernet_operations addrconf_ops = {
4530 .init = addrconf_init_net,
4531 .exit = addrconf_exit_net,
4532};
4533
1da177e4
LT		 4534/*
4535 * Device notifier
4536 */
4537
4538int register_inet6addr_notifier(struct notifier_block *nb)
4539{
1ab1457c 4540 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4541}
7159039a
YH		 4542EXPORT_SYMBOL(register_inet6addr_notifier);
4543
1da177e4
LT		 4544int unregister_inet6addr_notifier(struct notifier_block *nb)
4545{
e21e8467 4546 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4547}
7159039a
YH		 4548EXPORT_SYMBOL(unregister_inet6addr_notifier);
4549
1da177e4
LT		 4550/*
4551 * Init / cleanup code
4552 */
4553
4554int __init addrconf_init(void)
4555{
c2e21293 4556 int i, err;
2a8cc6c8 4557
e21e8467
SH		 4558 err = ipv6_addr_label_init();
4559 if (err < 0) {
4560 printk(KERN_CRIT "IPv6 Addrconf:"
4561 " cannot initialize default policy table: %d.\n", err);
2a8cc6c8
YH		 4562 return err;
4563 }
1da177e4 4564
e0da5a48
PE		 4565 register_pernet_subsys(&addrconf_ops);
4566
1da177e4
LT		 4567 /* The addrconf netdev notifier requires that loopback_dev
4568 * has it's ipv6 private information allocated and setup
4569 * before it can bring up and give link-local addresses
4570 * to other devices which are up.
4571 *
4572 * Unfortunately, loopback_dev is not necessarily the first
4573 * entry in the global dev_base list of net devices. In fact,
4574 * it is likely to be the very last entry on that list.
4575 * So this causes the notifier registry below to try and
4576 * give link-local addresses to all devices besides loopback_dev
4577 * first, then loopback_dev, which cases all the non-loopback_dev
4578 * devices to fail to get a link-local address.
4579 *
4580 * So, as a temporary fix, allocate the ipv6 structure for
4581 * loopback_dev first by hand.
4582 * Longer term, all of the dependencies ipv6 has upon the loopback
4583 * device and it being up should be removed.
4584 */
4585 rtnl_lock();
2774c7ab 4586 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4587 err = -ENOMEM;
4588 rtnl_unlock();
4589 if (err)
e0da5a48 4590 goto errlo;
1da177e4 4591
c2e21293 4592 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4593 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4594
1da177e4
LT		 4595 register_netdevice_notifier(&ipv6_dev_notf);
4596
1da177e4 4597 addrconf_verify(0);
c127ea2c
TG		 4598
4599 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4600 if (err < 0)
4601 goto errout;
4602
4603 /* Only the first call to __rtnl_register can fail */
4604 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4605 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4606 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4607 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4608 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4609
2a8cc6c8
YH		 4610 ipv6_addr_label_rtnl_register();
4611
1da177e4 4612 return 0;
c127ea2c
TG		 4613errout:
4614 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4615errlo:
4616 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4617
4618 return err;
1da177e4
LT		 4619}
4620
09f7709f 4621void addrconf_cleanup(void)
1da177e4 4622{
176c39af 4623 struct net_device *dev;
1da177e4
LT		 4624 int i;
4625
4626 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4627 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4628
4629 rtnl_lock();
4630
176c39af
DL		 4631 /* clean dev list */
4632 for_each_netdev(&init_net, dev) {
4633 if (__in6_dev_get(dev) == NULL)
4634 continue;
4635 addrconf_ifdown(dev, 1);
4636 }
4637 addrconf_ifdown(init_net.loopback_dev, 2);
4638
1da177e4
LT		 4639 /*
4640 * Check hash table.
4641 */
5c578aed 4642 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4643 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4644 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4645 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4646
4647 del_timer(&addr_chk_timer);
1da177e4 4648 rtnl_unlock();
1da177e4 4649}
Clone of davem's net-next-2.6 tree