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IPv6: keep route for tentative address
[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>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
e21e8467 101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 102
b2db7564
YH		 103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
1da177e4 107#ifdef CONFIG_SYSCTL
f52295a9 108static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
1da177e4
LT		 118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 126#endif
127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
1da177e4
LT		 137static void addrconf_verify(unsigned long);
138
8d06afab 139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
93d9b7d7
JP		 145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
1da177e4
LT		 147static int addrconf_ifdown(struct net_device *dev, int how);
148
e431b8c0 149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 152static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
1ab1457c 157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 158 struct prefix_info *pinfo);
3e81c6da
DM		 159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
1da177e4 161
e041c683 162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 163
888c848e 164static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 184 .accept_ra_defrtr = 1,
c4fd30eb 185 .accept_ra_pinfo = 1,
930d6ff2
YH		 186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
52e16356 188 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
930d6ff2 192#endif
fbea49e1 193 .proxy_ndp = 0,
0bcbc926 194 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 195 .disable_ipv6 = 0,
1b34be74 196 .accept_dad = 1,
1da177e4
LT		 197};
198
ab32ea5d 199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
c4fd30eb 219 .accept_ra_pinfo = 1,
930d6ff2
YH		 220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
52e16356 222 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
930d6ff2 226#endif
fbea49e1 227 .proxy_ndp = 0,
0bcbc926 228 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 229 .disable_ipv6 = 0,
1b34be74 230 .accept_dad = 1,
1da177e4
LT		 231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 238
f24e3d65 239/* Check if a valid qdisc is available */
05297949 240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 241{
05297949 242 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 243}
244
2b5ead46
YH		 245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
1da177e4
LT		 251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
e21e8467 257enum addrconf_timer_t {
1da177e4
LT		 258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
e21e8467
SH		 277 default:
278 break;
1da177e4
LT		 279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 287 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 288 goto err_ip;
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 290 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 291 goto err_icmp;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 293 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 294 goto err_icmpmsg;
7f7d9a6b
HX		 295
296 return 0;
297
14878f75 298err_icmpmsg:
7d720c3e 299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 300err_icmp:
7d720c3e 301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 302err_ip:
aaf70ec7 303 return -ENOMEM;
7f7d9a6b
HX		 304}
305
16910b98 306static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 307{
7d720c3e
TH		 308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 311}
312
1da177e4
LT		 313/* Nobody refers to this device, we may destroy it. */
314
8814c4b5
YH		 315static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316{
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319}
320
1da177e4
LT		 321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4
LT		 328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
e21e8467 333 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
8814c4b5 337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 338}
339
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
1da177e4
LT		 342static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
b077d7ab
YH		 401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
1da177e4
LT		 426#endif
427
f24e3d65 428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 429 ndev->if_flags |= IF_READY;
430
322f74a4
IO		 431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
f52295a9 433 addrconf_sysctl_register(ndev);
30c4cf57
DS		 434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 436
437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
1da177e4
LT		 440 return ndev;
441}
442
cee89473 443static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
e21e8467
SH		 449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
1da177e4
LT		 453 return NULL;
454 }
c5e33bdd 455
1da177e4
LT		 456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
1da177e4
LT		 466
467 if (!idev)
468 return;
469 dev = idev->dev;
0187bdfb
BH		 470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
1da177e4 472 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 473 if (idev->cnf.forwarding)
f3ee4010 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 475 else
f3ee4010 476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 477 }
502a2ffd 478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
1da177e4
LT		 482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
e186932b 490static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
c6d14c84
ED		 495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 497 idev = __in6_dev_get(dev);
498 if (idev) {
e186932b
PE		 499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
1da177e4
LT		 501 if (changed)
502 dev_forward_change(idev);
503 }
1da177e4 504 }
c6d14c84 505 rcu_read_unlock();
1da177e4 506}
c8fecf22 507
b325fddb 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 509{
bff16c2f
PE		 510 struct net *net;
511
512 net = (struct net *)table->extra2;
441fc2a2 513 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 514 return 0;
515
88af182e
EB		 516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
5007392d 519 return restart_syscall();
88af182e 520 }
c8fecf22 521
e186932b
PE		 522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
c8fecf22
PE		 526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 528 rtnl_unlock();
c8fecf22
PE		 529
530 if (*p)
7b4da532 531 rt6_purge_dflt_routers(net);
b325fddb 532 return 1;
c8fecf22 533}
1da177e4
LT		 534#endif
535
5c578aed 536static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537{
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540}
1da177e4 541
5c578aed 542/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 543void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544{
c2e21293 545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 546
1da177e4
LT		 547#ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549#endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
e21e8467 554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4
LT		 555
556 if (!ifp->dead) {
e21e8467 557 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 558 return;
559 }
560 dst_release(&ifp->rt->u.dst);
561
5c578aed 562 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 563}
564
e55ffac6
BH		 565static void
566ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
567{
502a2ffd 568 struct list_head *p;
8a6ce0c0 569 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 570
571 /*
572 * Each device address list is sorted in order of scope -
573 * global before linklocal.
574 */
502a2ffd 575 list_for_each(p, &idev->addr_list) {
576 struct inet6_ifaddr *ifa
577 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 578 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 579 break;
580 }
581
b54c9b98 582 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 583}
584
3a88a81d 585static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 586{
3eb84f49
YH		 587 /*
588 * We perform the hash function over the last 64 bits of the address
589 * This will include the IEEE address token on links that support it.
590 */
3a88a81d 591 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
592 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 593}
594
1da177e4
LT		 595/* On success it returns ifp with increased reference count */
596
597static struct inet6_ifaddr *
598ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 599 int scope, u32 flags)
1da177e4
LT		 600{
601 struct inet6_ifaddr *ifa = NULL;
602 struct rt6_info *rt;
3a88a81d 603 unsigned int hash;
1da177e4 604 int err = 0;
d68b8270
YH		 605 int addr_type = ipv6_addr_type(addr);
606
607 if (addr_type == IPV6_ADDR_ANY ||
608 addr_type & IPV6_ADDR_MULTICAST ||
609 (!(idev->dev->flags & IFF_LOOPBACK) &&
610 addr_type & IPV6_ADDR_LOOPBACK))
611 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 612
8814c4b5 613 rcu_read_lock_bh();
1da177e4
LT		 614 if (idev->dead) {
615 err = -ENODEV; /*XXX*/
616 goto out2;
617 }
618
56d417b1 619 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 620 err = -EACCES;
621 goto out2;
622 }
623
5c578aed 624 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 625
626 /* Ignore adding duplicate addresses on an interface */
c346dca1 627 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 628 ADBG(("ipv6_add_addr: already assigned\n"));
629 err = -EEXIST;
630 goto out;
631 }
632
322f74a4 633 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 634
635 if (ifa == NULL) {
636 ADBG(("ipv6_add_addr: malloc failed\n"));
637 err = -ENOBUFS;
638 goto out;
639 }
640
641 rt = addrconf_dst_alloc(idev, addr, 0);
642 if (IS_ERR(rt)) {
643 err = PTR_ERR(rt);
644 goto out;
645 }
646
1da177e4
LT		 647 ipv6_addr_copy(&ifa->addr, addr);
648
649 spin_lock_init(&ifa->lock);
650 init_timer(&ifa->timer);
c2e21293 651 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 652 ifa->timer.data = (unsigned long) ifa;
653 ifa->scope = scope;
654 ifa->prefix_len = pfxlen;
655 ifa->flags = flags | IFA_F_TENTATIVE;
656 ifa->cstamp = ifa->tstamp = jiffies;
657
57f5f544
KF		 658 ifa->rt = rt;
659
95c385b4
NH		 660 /*
661 * part one of RFC 4429, section 3.3
662 * We should not configure an address as
663 * optimistic if we do not yet know the link
664 * layer address of our nexhop router
665 */
666
667 if (rt->rt6i_nexthop == NULL)
668 ifa->flags &= ~IFA_F_OPTIMISTIC;
669
1da177e4
LT		 670 ifa->idev = idev;
671 in6_dev_hold(idev);
672 /* For caller */
673 in6_ifa_hold(ifa);
674
675 /* Add to big hash table */
676 hash = ipv6_addr_hash(addr);
677
5c578aed 678 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1da177e4 679 in6_ifa_hold(ifa);
5c578aed 680 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 681
682 write_lock(&idev->lock);
683 /* Add to inet6_dev unicast addr list. */
e55ffac6 684 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 685
686#ifdef CONFIG_IPV6_PRIVACY
687 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 688 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 689 in6_ifa_hold(ifa);
690 }
691#endif
692
1da177e4
LT		 693 in6_ifa_hold(ifa);
694 write_unlock(&idev->lock);
695out2:
8814c4b5 696 rcu_read_unlock_bh();
1da177e4 697
fd92833a 698 if (likely(err == 0))
e041c683 699 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 700 else {
701 kfree(ifa);
702 ifa = ERR_PTR(err);
703 }
704
705 return ifa;
706out:
5c578aed 707 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 708 goto out2;
709}
710
711/* This function wants to get referenced ifp and releases it before return */
712
713static void ipv6_del_addr(struct inet6_ifaddr *ifp)
714{
502a2ffd 715 struct inet6_ifaddr *ifa, *ifn;
1da177e4
LT		 716 struct inet6_dev *idev = ifp->idev;
717 int hash;
718 int deleted = 0, onlink = 0;
719 unsigned long expires = jiffies;
720
721 hash = ipv6_addr_hash(&ifp->addr);
722
723 ifp->dead = 1;
724
5c578aed 725 spin_lock_bh(&addrconf_hash_lock);
726 hlist_del_init_rcu(&ifp->addr_lst);
c2e21293 727 __in6_ifa_put(ifp);
5c578aed 728 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 729
730 write_lock_bh(&idev->lock);
731#ifdef CONFIG_IPV6_PRIVACY
732 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 733 list_del(&ifp->tmp_list);
734 if (ifp->ifpub) {
735 in6_ifa_put(ifp->ifpub);
736 ifp->ifpub = NULL;
1da177e4 737 }
372e6c8f 738 __in6_ifa_put(ifp);
1da177e4
LT		 739 }
740#endif
741
502a2ffd 742 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 743 if (ifa == ifp) {
502a2ffd 744 list_del_init(&ifp->if_list);
1da177e4 745 __in6_ifa_put(ifp);
502a2ffd 746
1da177e4
LT		 747 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
748 break;
749 deleted = 1;
1d142804 750 continue;
1da177e4
LT		 751 } else if (ifp->flags & IFA_F_PERMANENT) {
752 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
753 ifp->prefix_len)) {
754 if (ifa->flags & IFA_F_PERMANENT) {
755 onlink = 1;
756 if (deleted)
757 break;
758 } else {
759 unsigned long lifetime;
760
761 if (!onlink)
762 onlink = -1;
763
764 spin_lock(&ifa->lock);
4bed72e4
YH		 765
766 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
767 /*
768 * Note: Because this address is
769 * not permanent, lifetime <
770 * LONG_MAX / HZ here.
771 */
1da177e4
LT		 772 if (time_before(expires,
773 ifa->tstamp + lifetime * HZ))
774 expires = ifa->tstamp + lifetime * HZ;
775 spin_unlock(&ifa->lock);
776 }
777 }
778 }
779 }
780 write_unlock_bh(&idev->lock);
781
b2238566
AV		 782 addrconf_del_timer(ifp);
783
1da177e4
LT		 784 ipv6_ifa_notify(RTM_DELADDR, ifp);
785
e041c683 786 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 787
1da177e4
LT		 788 /*
789 * Purge or update corresponding prefix
790 *
791 * 1) we don't purge prefix here if address was not permanent.
792 * prefix is managed by its own lifetime.
793 * 2) if there're no addresses, delete prefix.
794 * 3) if there're still other permanent address(es),
795 * corresponding prefix is still permanent.
796 * 4) otherwise, update prefix lifetime to the
797 * longest valid lifetime among the corresponding
798 * addresses on the device.
799 * Note: subsequent RA will update lifetime.
800 *
801 * --yoshfuji
802 */
803 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
804 struct in6_addr prefix;
805 struct rt6_info *rt;
c346dca1 806 struct net *net = dev_net(ifp->idev->dev);
1da177e4 807 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 808 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 809
2b5ead46 810 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 811 if (onlink == 0) {
e0a1ad73 812 ip6_del_rt(rt);
1da177e4
LT		 813 rt = NULL;
814 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
815 rt->rt6i_expires = expires;
816 rt->rt6i_flags |= RTF_EXPIRES;
817 }
818 }
819 dst_release(&rt->u.dst);
820 }
821
822 in6_ifa_put(ifp);
823}
824
825#ifdef CONFIG_IPV6_PRIVACY
826static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
827{
828 struct inet6_dev *idev = ifp->idev;
829 struct in6_addr addr, *tmpaddr;
830 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 831 unsigned long regen_advance;
1da177e4
LT		 832 int tmp_plen;
833 int ret = 0;
834 int max_addresses;
95c385b4 835 u32 addr_flags;
1da177e4
LT		 836
837 write_lock(&idev->lock);
838 if (ift) {
839 spin_lock_bh(&ift->lock);
840 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
841 spin_unlock_bh(&ift->lock);
842 tmpaddr = &addr;
843 } else {
844 tmpaddr = NULL;
845 }
846retry:
847 in6_dev_hold(idev);
848 if (idev->cnf.use_tempaddr <= 0) {
849 write_unlock(&idev->lock);
850 printk(KERN_INFO
851 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
852 in6_dev_put(idev);
853 ret = -1;
854 goto out;
855 }
856 spin_lock_bh(&ifp->lock);
857 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
858 idev->cnf.use_tempaddr = -1; /*XXX*/
859 spin_unlock_bh(&ifp->lock);
860 write_unlock(&idev->lock);
861 printk(KERN_WARNING
862 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
863 in6_dev_put(idev);
864 ret = -1;
865 goto out;
866 }
867 in6_ifa_hold(ifp);
868 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
869 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
870 spin_unlock_bh(&ifp->lock);
871 write_unlock(&idev->lock);
872 printk(KERN_WARNING
873 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
874 in6_ifa_put(ifp);
875 in6_dev_put(idev);
876 ret = -1;
877 goto out;
878 }
879 memcpy(&addr.s6_addr[8], idev->rndid, 8);
880 tmp_valid_lft = min_t(__u32,
881 ifp->valid_lft,
882 idev->cnf.temp_valid_lft);
1ab1457c
YH		 883 tmp_prefered_lft = min_t(__u32,
884 ifp->prefered_lft,
1da177e4
LT		 885 idev->cnf.temp_prefered_lft - desync_factor / HZ);
886 tmp_plen = ifp->prefix_len;
887 max_addresses = idev->cnf.max_addresses;
888 tmp_cstamp = ifp->cstamp;
889 tmp_tstamp = ifp->tstamp;
890 spin_unlock_bh(&ifp->lock);
891
eac55bf9
BB		 892 regen_advance = idev->cnf.regen_max_retry *
893 idev->cnf.dad_transmits *
894 idev->nd_parms->retrans_time / HZ;
1da177e4 895 write_unlock(&idev->lock);
95c385b4 896
eac55bf9
BB		 897 /* A temporary address is created only if this calculated Preferred
898 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
899 * an implementation must not create a temporary address with a zero
900 * Preferred Lifetime.
901 */
902 if (tmp_prefered_lft <= regen_advance) {
903 in6_ifa_put(ifp);
904 in6_dev_put(idev);
905 ret = -1;
906 goto out;
907 }
908
95c385b4
NH		 909 addr_flags = IFA_F_TEMPORARY;
910 /* set in addrconf_prefix_rcv() */
911 if (ifp->flags & IFA_F_OPTIMISTIC)
912 addr_flags |= IFA_F_OPTIMISTIC;
913
1da177e4 914 ift = !max_addresses ||
1ab1457c 915 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 916 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 917 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
918 addr_flags) : NULL;
1da177e4
LT		 919 if (!ift || IS_ERR(ift)) {
920 in6_ifa_put(ifp);
921 in6_dev_put(idev);
922 printk(KERN_INFO
923 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
924 tmpaddr = &addr;
925 write_lock(&idev->lock);
926 goto retry;
927 }
928
929 spin_lock_bh(&ift->lock);
930 ift->ifpub = ifp;
931 ift->valid_lft = tmp_valid_lft;
932 ift->prefered_lft = tmp_prefered_lft;
933 ift->cstamp = tmp_cstamp;
934 ift->tstamp = tmp_tstamp;
935 spin_unlock_bh(&ift->lock);
936
937 addrconf_dad_start(ift, 0);
938 in6_ifa_put(ift);
939 in6_dev_put(idev);
940out:
941 return ret;
942}
943#endif
944
945/*
072047e4 946 * Choose an appropriate source address (RFC3484)
1da177e4 947 */
a9b05723
YH		 948enum {
949 IPV6_SADDR_RULE_INIT = 0,
950 IPV6_SADDR_RULE_LOCAL,
951 IPV6_SADDR_RULE_SCOPE,
952 IPV6_SADDR_RULE_PREFERRED,
953#ifdef CONFIG_IPV6_MIP6
954 IPV6_SADDR_RULE_HOA,
955#endif
956 IPV6_SADDR_RULE_OIF,
957 IPV6_SADDR_RULE_LABEL,
958#ifdef CONFIG_IPV6_PRIVACY
959 IPV6_SADDR_RULE_PRIVACY,
960#endif
961 IPV6_SADDR_RULE_ORCHID,
962 IPV6_SADDR_RULE_PREFIX,
963 IPV6_SADDR_RULE_MAX
964};
965
072047e4 966struct ipv6_saddr_score {
a9b05723
YH		 967 int rule;
968 int addr_type;
969 struct inet6_ifaddr *ifa;
970 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
971 int scopedist;
972 int matchlen;
072047e4
YH		 973};
974
a9b05723 975struct ipv6_saddr_dst {
9acd9f3a 976 const struct in6_addr *addr;
a9b05723
YH		 977 int ifindex;
978 int scope;
979 int label;
7cbca67c 980 unsigned int prefs;
a9b05723 981};
072047e4 982
b6f99a21 983static inline int ipv6_saddr_preferred(int type)
1da177e4 984{
45bb0060 985 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 986 return 1;
987 return 0;
1da177e4
LT		 988}
989
3de23255
BT		 990static int ipv6_get_saddr_eval(struct net *net,
991 struct ipv6_saddr_score *score,
a9b05723
YH		 992 struct ipv6_saddr_dst *dst,
993 int i)
994{
995 int ret;
996
997 if (i <= score->rule) {
998 switch (i) {
999 case IPV6_SADDR_RULE_SCOPE:
1000 ret = score->scopedist;
1001 break;
1002 case IPV6_SADDR_RULE_PREFIX:
1003 ret = score->matchlen;
1004 break;
1005 default:
1006 ret = !!test_bit(i, score->scorebits);
1007 }
1008 goto out;
1009 }
1010
1011 switch (i) {
1012 case IPV6_SADDR_RULE_INIT:
1013 /* Rule 0: remember if hiscore is not ready yet */
1014 ret = !!score->ifa;
1015 break;
1016 case IPV6_SADDR_RULE_LOCAL:
1017 /* Rule 1: Prefer same address */
1018 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1019 break;
1020 case IPV6_SADDR_RULE_SCOPE:
1021 /* Rule 2: Prefer appropriate scope
1022 *
1023 * ret
1024 * ^
1025 * -1 | d 15
1026 * ---+--+-+---> scope
1027 * |
1028 * | d is scope of the destination.
1029 * B-d | \
1030 * | \ <- smaller scope is better if
1031 * B-15 | \ if scope is enough for destinaion.
1032 * | ret = B - scope (-1 <= scope >= d <= 15).
1033 * d-C-1 | /
1034 * |/ <- greater is better
1035 * -C / if scope is not enough for destination.
1036 * /| ret = scope - C (-1 <= d < scope <= 15).
1037 *
1038 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1039 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1040 * Assume B = 0 and we get C > 29.
1041 */
1042 ret = __ipv6_addr_src_scope(score->addr_type);
1043 if (ret >= dst->scope)
1044 ret = -ret;
1045 else
1046 ret -= 128; /* 30 is enough */
1047 score->scopedist = ret;
1048 break;
1049 case IPV6_SADDR_RULE_PREFERRED:
1050 /* Rule 3: Avoid deprecated and optimistic addresses */
1051 ret = ipv6_saddr_preferred(score->addr_type) ||
1052 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1053 break;
1054#ifdef CONFIG_IPV6_MIP6
1055 case IPV6_SADDR_RULE_HOA:
7cbca67c 1056 {
a9b05723 1057 /* Rule 4: Prefer home address */
7cbca67c
YH		 1058 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1059 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1060 break;
7cbca67c 1061 }
a9b05723
YH		 1062#endif
1063 case IPV6_SADDR_RULE_OIF:
1064 /* Rule 5: Prefer outgoing interface */
1065 ret = (!dst->ifindex ||
1066 dst->ifindex == score->ifa->idev->dev->ifindex);
1067 break;
1068 case IPV6_SADDR_RULE_LABEL:
1069 /* Rule 6: Prefer matching label */
3de23255
BT		 1070 ret = ipv6_addr_label(net,
1071 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1072 score->ifa->idev->dev->ifindex) == dst->label;
1073 break;
1074#ifdef CONFIG_IPV6_PRIVACY
1075 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1076 {
a9b05723
YH		 1077 /* Rule 7: Prefer public address
1078 * Note: prefer temprary address if use_tempaddr >= 2
1079 */
7cbca67c
YH		 1080 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1081 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1082 score->ifa->idev->cnf.use_tempaddr >= 2;
1083 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1084 break;
7cbca67c 1085 }
a9b05723
YH		 1086#endif
1087 case IPV6_SADDR_RULE_ORCHID:
1088 /* Rule 8-: Prefer ORCHID vs ORCHID or
1089 * non-ORCHID vs non-ORCHID
1090 */
1091 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1092 ipv6_addr_orchid(dst->addr));
1093 break;
1094 case IPV6_SADDR_RULE_PREFIX:
1095 /* Rule 8: Use longest matching prefix */
1096 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1097 dst->addr);
1098 break;
1099 default:
1100 ret = 0;
1101 }
1102
1103 if (ret)
1104 __set_bit(i, score->scorebits);
1105 score->rule = i;
1106out:
1107 return ret;
1108}
1109
191cd582 1110int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1111 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1112 struct in6_addr *saddr)
1da177e4 1113{
a9b05723
YH		 1114 struct ipv6_saddr_score scores[2],
1115 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1116 struct ipv6_saddr_dst dst;
072047e4 1117 struct net_device *dev;
a9b05723 1118 int dst_type;
1da177e4 1119
a9b05723
YH		 1120 dst_type = __ipv6_addr_type(daddr);
1121 dst.addr = daddr;
1122 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1123 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1124 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1125 dst.prefs = prefs;
a9b05723
YH		 1126
1127 hiscore->rule = -1;
1128 hiscore->ifa = NULL;
1da177e4 1129
8814c4b5 1130 rcu_read_lock();
1da177e4 1131
c6d14c84 1132 for_each_netdev_rcu(net, dev) {
072047e4 1133 struct inet6_dev *idev;
072047e4 1134
a9b05723 1135 /* Candidate Source Address (section 4)
072047e4
YH		 1136 * - multicast and link-local destination address,
1137 * the set of candidate source address MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same link as the outgoing
1140 * interface.
1141 * (- For site-local destination addresses, the
1142 * set of candidate source addresses MUST only
1143 * include addresses assigned to interfaces
1144 * belonging to the same site as the outgoing
1145 * interface.)
1146 */
a9b05723
YH		 1147 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1148 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1149 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1150 continue;
1da177e4 1151
1da177e4 1152 idev = __in6_dev_get(dev);
072047e4
YH		 1153 if (!idev)
1154 continue;
1155
1156 read_lock_bh(&idev->lock);
502a2ffd 1157 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1158 int i;
072047e4 1159
a9b05723 1160 /*
6b3ae80a
YH		 1161 * - Tentative Address (RFC2462 section 5.4)
1162 * - A tentative address is not considered
1163 * "assigned to an interface" in the traditional
95c385b4 1164 * sense, unless it is also flagged as optimistic.
6b3ae80a 1165 * - Candidate Source Address (section 4)
072047e4
YH		 1166 * - In any case, anycast addresses, multicast
1167 * addresses, and the unspecified address MUST
1168 * NOT be included in a candidate set.
1169 */
a9b05723
YH		 1170 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1171 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1172 continue;
a9b05723
YH		 1173
1174 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175
1176 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1177 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1178 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1179 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1180 "assigned as unicast address on %s",
1181 dev->name);
1182 continue;
1183 }
1184
a9b05723
YH		 1185 score->rule = -1;
1186 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187
1188 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1189 int minihiscore, miniscore;
1190
3de23255
BT		 1191 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1192 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1193
1194 if (minihiscore > miniscore) {
1195 if (i == IPV6_SADDR_RULE_SCOPE &&
1196 score->scopedist > 0) {
1197 /*
1198 * special case:
1199 * each remaining entry
1200 * has too small (not enough)
1201 * scope, because ifa entries
1202 * are sorted by their scope
1203 * values.
1204 */
1205 goto try_nextdev;
1206 }
1207 break;
1208 } else if (minihiscore < miniscore) {
a9b05723
YH		 1209 if (hiscore->ifa)
1210 in6_ifa_put(hiscore->ifa);
1211
1212 in6_ifa_hold(score->ifa);
1213
a0bffffc 1214 swap(hiscore, score);
a9b05723
YH		 1215
1216 /* restore our iterator */
1217 score->ifa = hiscore->ifa;
1218
1219 break;
1da177e4 1220 }
072047e4 1221 }
1da177e4 1222 }
a9b05723 1223try_nextdev:
072047e4 1224 read_unlock_bh(&idev->lock);
1da177e4 1225 }
8814c4b5 1226 rcu_read_unlock();
1da177e4 1227
a9b05723 1228 if (!hiscore->ifa)
072047e4 1229 return -EADDRNOTAVAIL;
1ab1457c 1230
a9b05723
YH		 1231 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1232 in6_ifa_put(hiscore->ifa);
072047e4 1233 return 0;
1da177e4 1234}
5e5f3f0f 1235EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1236
95c385b4
NH		 1237int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1238 unsigned char banned_flags)
1da177e4
LT		 1239{
1240 struct inet6_dev *idev;
1241 int err = -EADDRNOTAVAIL;
1242
8814c4b5 1243 rcu_read_lock();
e21e8467
SH		 1244 idev = __in6_dev_get(dev);
1245 if (idev) {
1da177e4
LT		 1246 struct inet6_ifaddr *ifp;
1247
1248 read_lock_bh(&idev->lock);
502a2ffd 1249 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1250 if (ifp->scope == IFA_LINK &&
1251 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1252 ipv6_addr_copy(addr, &ifp->addr);
1253 err = 0;
1254 break;
1255 }
1256 }
1257 read_unlock_bh(&idev->lock);
1258 }
8814c4b5 1259 rcu_read_unlock();
1da177e4
LT		 1260 return err;
1261}
1262
1263static int ipv6_count_addresses(struct inet6_dev *idev)
1264{
1265 int cnt = 0;
1266 struct inet6_ifaddr *ifp;
1267
1268 read_lock_bh(&idev->lock);
502a2ffd 1269 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1270 cnt++;
1271 read_unlock_bh(&idev->lock);
1272 return cnt;
1273}
1274
bfeade08
DL		 1275int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1276 struct net_device *dev, int strict)
1da177e4 1277{
c2e21293 1278 struct inet6_ifaddr *ifp = NULL;
1279 struct hlist_node *node;
3a88a81d 1280 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1281
5c578aed 1282 rcu_read_lock_bh();
1283 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1284 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1285 continue;
1da177e4
LT		 1286 if (ipv6_addr_equal(&ifp->addr, addr) &&
1287 !(ifp->flags&IFA_F_TENTATIVE)) {
1288 if (dev == NULL || ifp->idev->dev == dev ||
1289 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1290 break;
1291 }
1292 }
5c578aed 1293 rcu_read_unlock_bh();
1294
1da177e4
LT		 1295 return ifp != NULL;
1296}
7159039a
YH		 1297EXPORT_SYMBOL(ipv6_chk_addr);
1298
3e81c6da
DM		 1299static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1da177e4 1301{
3e81c6da 1302 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1da177e4 1305
c2e21293 1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1307 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1308 continue;
1da177e4
LT		 1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1311 return true;
1da177e4
LT		 1312 }
1313 }
3e81c6da 1314 return false;
1da177e4
LT		 1315}
1316
52eeeb84
YH		 1317int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1318{
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
502a2ffd 1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338}
1339
1340EXPORT_SYMBOL(ipv6_chk_prefix);
1341
9acd9f3a 1342struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1343 struct net_device *dev, int strict)
1da177e4 1344{
b79d1d54 1345 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1346 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1347 struct hlist_node *node;
1da177e4 1348
5c578aed 1349 rcu_read_lock_bh();
1350 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1352 continue;
1da177e4
LT		 1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1356 result = ifp;
1da177e4
LT		 1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
5c578aed 1362 rcu_read_unlock_bh();
1da177e4 1363
b79d1d54 1364 return result;
1da177e4
LT		 1365}
1366
1da177e4
LT		 1367/* Gets referenced address, destroys ifaddr */
1368
cc411d0b 1369static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1370{
1da177e4
LT		 1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1377 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1380 in6_ifa_put(ifp);
1381#ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395#endif
1396 } else
1397 ipv6_del_addr(ifp);
1398}
1399
3c21edbd
YH		 1400void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1401{
1b34be74 1402 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1403
1404 if (net_ratelimit())
0522fea6
JR		 1405 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1406 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1407
1b34be74
YH		 1408 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1409 struct in6_addr addr;
1410
1411 addr.s6_addr32[0] = htonl(0xfe800000);
1412 addr.s6_addr32[1] = 0;
1413
1414 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1415 ipv6_addr_equal(&ifp->addr, &addr)) {
1416 /* DAD failed for link-local based on MAC address */
1417 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1418
1419 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1420 ifp->idev->dev->name);
1b34be74
YH		 1421 }
1422 }
1423
cc411d0b 1424 addrconf_dad_stop(ifp, 1);
3c21edbd 1425}
1da177e4
LT		 1426
1427/* Join to solicited addr multicast group. */
1428
1429void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1430{
1431 struct in6_addr maddr;
1432
1433 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1434 return;
1435
1436 addrconf_addr_solict_mult(addr, &maddr);
1437 ipv6_dev_mc_inc(dev, &maddr);
1438}
1439
1440void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1441{
1442 struct in6_addr maddr;
1443
1444 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1445 return;
1446
1447 addrconf_addr_solict_mult(addr, &maddr);
1448 __ipv6_dev_mc_dec(idev, &maddr);
1449}
1450
20380731 1451static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1452{
1453 struct in6_addr addr;
1454 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1455 if (ipv6_addr_any(&addr))
1456 return;
1457 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1458}
1459
20380731 1460static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1461{
1462 struct in6_addr addr;
1463 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1464 if (ipv6_addr_any(&addr))
1465 return;
1466 __ipv6_dev_ac_dec(ifp->idev, &addr);
1467}
1468
073a8e0e
YH		 1469static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1470{
1471 if (dev->addr_len != ETH_ALEN)
1472 return -1;
1473 memcpy(eui, dev->dev_addr, 3);
1474 memcpy(eui + 5, dev->dev_addr + 3, 3);
1475
1476 /*
1477 * The zSeries OSA network cards can be shared among various
1478 * OS instances, but the OSA cards have only one MAC address.
1479 * This leads to duplicate address conflicts in conjunction
1480 * with IPv6 if more than one instance uses the same card.
1481 *
1482 * The driver for these cards can deliver a unique 16-bit
1483 * identifier for each instance sharing the same card. It is
1484 * placed instead of 0xFFFE in the interface identifier. The
1485 * "u" bit of the interface identifier is not inverted in this
1486 * case. Hence the resulting interface identifier has local
1487 * scope according to RFC2373.
1488 */
1489 if (dev->dev_id) {
1490 eui[3] = (dev->dev_id >> 8) & 0xFF;
1491 eui[4] = dev->dev_id & 0xFF;
1492 } else {
1493 eui[3] = 0xFF;
1494 eui[4] = 0xFE;
1495 eui[0] ^= 2;
1496 }
1497 return 0;
1498}
1499
1500static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1501{
1502 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1503 if (dev->addr_len != ARCNET_ALEN)
1504 return -1;
1505 memset(eui, 0, 7);
1506 eui[7] = *(u8*)dev->dev_addr;
1507 return 0;
1508}
1509
1510static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1511{
1512 if (dev->addr_len != INFINIBAND_ALEN)
1513 return -1;
1514 memcpy(eui, dev->dev_addr + 12, 8);
1515 eui[0] |= 2;
1516 return 0;
1517}
1518
dfd982ba
YH		 1519int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1520{
9af28511
SH		 1521 if (addr == 0)
1522 return -1;
dfd982ba
YH		 1523 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1524 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1525 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1526 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1527 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1528 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1529 eui[1] = 0;
1530 eui[2] = 0x5E;
1531 eui[3] = 0xFE;
1532 memcpy(eui + 4, &addr, 4);
1533 return 0;
1534}
1535EXPORT_SYMBOL(__ipv6_isatap_ifid);
1536
1537static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1538{
1539 if (dev->priv_flags & IFF_ISATAP)
1540 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1541 return -1;
1542}
1543
1da177e4
LT		 1544static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1545{
1546 switch (dev->type) {
1547 case ARPHRD_ETHER:
1548 case ARPHRD_FDDI:
1549 case ARPHRD_IEEE802_TR:
073a8e0e 1550 return addrconf_ifid_eui48(eui, dev);
1da177e4 1551 case ARPHRD_ARCNET:
073a8e0e 1552 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1553 case ARPHRD_INFINIBAND:
073a8e0e 1554 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1555 case ARPHRD_SIT:
dfd982ba 1556 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1557 }
1558 return -1;
1559}
1560
1561static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1562{
1563 int err = -1;
1564 struct inet6_ifaddr *ifp;
1565
1566 read_lock_bh(&idev->lock);
502a2ffd 1567 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1568 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1569 memcpy(eui, ifp->addr.s6_addr+8, 8);
1570 err = 0;
1571 break;
1572 }
1573 }
1574 read_unlock_bh(&idev->lock);
1575 return err;
1576}
1577
1578#ifdef CONFIG_IPV6_PRIVACY
1579/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1580static int __ipv6_regen_rndid(struct inet6_dev *idev)
1581{
1da177e4 1582regen:
955189ef 1583 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1584 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1585
1586 /*
1587 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1588 * check if generated address is not inappropriate
1589 *
1590 * - Reserved subnet anycast (RFC 2526)
1591 * 11111101 11....11 1xxxxxxx
c7dc89c0 1592 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1593 * 00-00-5E-FE-xx-xx-xx-xx
1594 * - value 0
1595 * - XXX: already assigned to an address on the device
1596 */
1ab1457c 1597 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1598 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1599 (idev->rndid[7]&0x80))
1600 goto regen;
1601 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1602 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1603 goto regen;
1604 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1605 goto regen;
1606 }
1607
1608 return 0;
1609}
1610
1611static void ipv6_regen_rndid(unsigned long data)
1612{
1613 struct inet6_dev *idev = (struct inet6_dev *) data;
1614 unsigned long expires;
1615
8814c4b5 1616 rcu_read_lock_bh();
1da177e4
LT		 1617 write_lock_bh(&idev->lock);
1618
1619 if (idev->dead)
1620 goto out;
1621
1622 if (__ipv6_regen_rndid(idev) < 0)
1623 goto out;
1ab1457c 1624
1da177e4 1625 expires = jiffies +
1ab1457c 1626 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1627 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1628 if (time_before(expires, jiffies)) {
1629 printk(KERN_WARNING
1630 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1631 idev->dev->name);
1632 goto out;
1633 }
1634
1635 if (!mod_timer(&idev->regen_timer, expires))
1636 in6_dev_hold(idev);
1637
1638out:
1639 write_unlock_bh(&idev->lock);
8814c4b5 1640 rcu_read_unlock_bh();
1da177e4
LT		 1641 in6_dev_put(idev);
1642}
1643
1644static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1645 int ret = 0;
1646
1647 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1648 ret = __ipv6_regen_rndid(idev);
1649 return ret;
1650}
1651#endif
1652
1653/*
1654 * Add prefix route.
1655 */
1656
1657static void
1658addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1659 unsigned long expires, u32 flags)
1da177e4 1660{
86872cb5
TG		 1661 struct fib6_config cfg = {
1662 .fc_table = RT6_TABLE_PREFIX,
1663 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1664 .fc_ifindex = dev->ifindex,
1665 .fc_expires = expires,
1666 .fc_dst_len = plen,
1667 .fc_flags = RTF_UP | flags,
c346dca1 1668 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1669 .fc_protocol = RTPROT_KERNEL,
86872cb5 1670 };
1da177e4 1671
86872cb5 1672 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1673
1674 /* Prevent useless cloning on PtP SIT.
1675 This thing is done here expecting that the whole
1676 class of non-broadcast devices need not cloning.
1677 */
0be669bb 1678#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1679 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1680 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1681#endif
1da177e4 1682
86872cb5 1683 ip6_route_add(&cfg);
1da177e4
LT		 1684}
1685
1686/* Create "default" multicast route to the interface */
1687
1688static void addrconf_add_mroute(struct net_device *dev)
1689{
86872cb5
TG		 1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_LOCAL,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_dst_len = 8,
1695 .fc_flags = RTF_UP,
c346dca1 1696 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1697 };
1698
1699 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1700
1701 ip6_route_add(&cfg);
1da177e4
LT		 1702}
1703
0be669bb 1704#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1705static void sit_route_add(struct net_device *dev)
1706{
86872cb5
TG		 1707 struct fib6_config cfg = {
1708 .fc_table = RT6_TABLE_MAIN,
1709 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1710 .fc_ifindex = dev->ifindex,
1711 .fc_dst_len = 96,
1712 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1713 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1714 };
1da177e4
LT		 1715
1716 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1717 ip6_route_add(&cfg);
1da177e4 1718}
0be669bb 1719#endif
1da177e4
LT		 1720
1721static void addrconf_add_lroute(struct net_device *dev)
1722{
1723 struct in6_addr addr;
1724
1725 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1726 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1727}
1728
1729static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1730{
1731 struct inet6_dev *idev;
1732
1733 ASSERT_RTNL();
1734
e21e8467
SH		 1735 idev = ipv6_find_idev(dev);
1736 if (!idev)
1da177e4
LT		 1737 return NULL;
1738
1739 /* Add default multicast route */
1740 addrconf_add_mroute(dev);
1741
1742 /* Add link local route */
1743 addrconf_add_lroute(dev);
1744 return idev;
1745}
1746
1747void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1748{
1749 struct prefix_info *pinfo;
1750 __u32 valid_lft;
1751 __u32 prefered_lft;
1752 int addr_type;
1da177e4 1753 struct inet6_dev *in6_dev;
56d417b1 1754 struct net *net = dev_net(dev);
1da177e4
LT		 1755
1756 pinfo = (struct prefix_info *) opt;
1ab1457c 1757
1da177e4
LT		 1758 if (len < sizeof(struct prefix_info)) {
1759 ADBG(("addrconf: prefix option too short\n"));
1760 return;
1761 }
1ab1457c 1762
1da177e4
LT		 1763 /*
1764 * Validation checks ([ADDRCONF], page 19)
1765 */
1766
1767 addr_type = ipv6_addr_type(&pinfo->prefix);
1768
1769 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1770 return;
1771
1772 valid_lft = ntohl(pinfo->valid);
1773 prefered_lft = ntohl(pinfo->prefered);
1774
1775 if (prefered_lft > valid_lft) {
1776 if (net_ratelimit())
1777 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1778 return;
1779 }
1780
1781 in6_dev = in6_dev_get(dev);
1782
1783 if (in6_dev == NULL) {
1784 if (net_ratelimit())
1785 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1786 return;
1787 }
1788
1789 /*
1790 * Two things going on here:
1791 * 1) Add routes for on-link prefixes
1792 * 2) Configure prefixes with the auto flag set
1793 */
1794
4bed72e4
YH		 1795 if (pinfo->onlink) {
1796 struct rt6_info *rt;
1797 unsigned long rt_expires;
1798
6f704992
YH		 1799 /* Avoid arithmetic overflow. Really, we could
1800 * save rt_expires in seconds, likely valid_lft,
1801 * but it would require division in fib gc, that it
1802 * not good.
1803 */
4bed72e4
YH		 1804 if (HZ > USER_HZ)
1805 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1806 else
1807 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1808
4bed72e4
YH		 1809 if (addrconf_finite_timeout(rt_expires))
1810 rt_expires *= HZ;
1da177e4 1811
56d417b1 1812 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1813 dev->ifindex, 1);
1da177e4 1814
2b5ead46 1815 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1816 /* Autoconf prefix route */
1817 if (valid_lft == 0) {
1818 ip6_del_rt(rt);
1819 rt = NULL;
4bed72e4 1820 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1821 /* not infinity */
1822 rt->rt6i_expires = jiffies + rt_expires;
1823 rt->rt6i_flags |= RTF_EXPIRES;
1824 } else {
1825 rt->rt6i_flags &= ~RTF_EXPIRES;
1826 rt->rt6i_expires = 0;
1da177e4
LT		 1827 }
1828 } else if (valid_lft) {
6f704992 1829 clock_t expires = 0;
4bed72e4
YH		 1830 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1831 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1832 /* not infinity */
1833 flags |= RTF_EXPIRES;
1834 expires = jiffies_to_clock_t(rt_expires);
1835 }
1da177e4 1836 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1837 dev, expires, flags);
1da177e4
LT		 1838 }
1839 if (rt)
1840 dst_release(&rt->u.dst);
1841 }
1842
1843 /* Try to figure out our local address for this prefix */
1844
1845 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1846 struct inet6_ifaddr * ifp;
1847 struct in6_addr addr;
1848 int create = 0, update_lft = 0;
1849
1850 if (pinfo->prefix_len == 64) {
1851 memcpy(&addr, &pinfo->prefix, 8);
1852 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1853 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1854 in6_dev_put(in6_dev);
1855 return;
1856 }
1857 goto ok;
1858 }
1859 if (net_ratelimit())
1860 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1861 pinfo->prefix_len);
1862 in6_dev_put(in6_dev);
1863 return;
1864
1865ok:
1866
53b7997f 1867 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1868
1869 if (ifp == NULL && valid_lft) {
1870 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1871 u32 addr_flags = 0;
1872
1873#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1874 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1875 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1876 addr_flags = IFA_F_OPTIMISTIC;
1877#endif
1da177e4
LT		 1878
1879 /* Do not allow to create too much of autoconfigured
1880 * addresses; this would be too easy way to crash kernel.
1881 */
1882 if (!max_addresses ||
1883 ipv6_count_addresses(in6_dev) < max_addresses)
1884 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1885 addr_type&IPV6_ADDR_SCOPE_MASK,
1886 addr_flags);
1da177e4
LT		 1887
1888 if (!ifp || IS_ERR(ifp)) {
1889 in6_dev_put(in6_dev);
1890 return;
1891 }
1892
1893 update_lft = create = 1;
1894 ifp->cstamp = jiffies;
1895 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1896 }
1897
1898 if (ifp) {
1899 int flags;
1900 unsigned long now;
1901#ifdef CONFIG_IPV6_PRIVACY
1902 struct inet6_ifaddr *ift;
1903#endif
1904 u32 stored_lft;
1905
1906 /* update lifetime (RFC2462 5.5.3 e) */
1907 spin_lock(&ifp->lock);
1908 now = jiffies;
1909 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1910 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1911 else
1912 stored_lft = 0;
1913 if (!update_lft && stored_lft) {
1914 if (valid_lft > MIN_VALID_LIFETIME ||
1915 valid_lft > stored_lft)
1916 update_lft = 1;
1917 else if (stored_lft <= MIN_VALID_LIFETIME) {
1918 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1919 /*
1920 * RFC 4862 Section 5.5.3e:
1921 * "Note that the preferred lifetime of
1922 * the corresponding address is always
1923 * reset to the Preferred Lifetime in
1924 * the received Prefix Information
1925 * option, regardless of whether the
1926 * valid lifetime is also reset or
1927 * ignored."
1928 *
1929 * So if the preferred lifetime in
1930 * this advertisement is different
1931 * than what we have stored, but the
1932 * valid lifetime is invalid, just
1933 * reset prefered_lft.
1934 *
1935 * We must set the valid lifetime
1936 * to the stored lifetime since we'll
1937 * be updating the timestamp below,
1938 * else we'll set it back to the
1939 * minumum.
1940 */
1941 if (prefered_lft != ifp->prefered_lft) {
1942 valid_lft = stored_lft;
1943 update_lft = 1;
1944 }
1da177e4
LT		 1945 } else {
1946 valid_lft = MIN_VALID_LIFETIME;
1947 if (valid_lft < prefered_lft)
1948 prefered_lft = valid_lft;
1949 update_lft = 1;
1950 }
1951 }
1952
1953 if (update_lft) {
1954 ifp->valid_lft = valid_lft;
1955 ifp->prefered_lft = prefered_lft;
1956 ifp->tstamp = now;
1957 flags = ifp->flags;
1958 ifp->flags &= ~IFA_F_DEPRECATED;
1959 spin_unlock(&ifp->lock);
1960
1961 if (!(flags&IFA_F_TENTATIVE))
1962 ipv6_ifa_notify(0, ifp);
1963 } else
1964 spin_unlock(&ifp->lock);
1965
1966#ifdef CONFIG_IPV6_PRIVACY
1967 read_lock_bh(&in6_dev->lock);
1968 /* update all temporary addresses in the list */
372e6c8f 1969 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1970 /*
1971 * When adjusting the lifetimes of an existing
1972 * temporary address, only lower the lifetimes.
1973 * Implementations must not increase the
1974 * lifetimes of an existing temporary address
1975 * when processing a Prefix Information Option.
1976 */
c6fbfac2
BB		 1977 if (ifp != ift->ifpub)
1978 continue;
1979
1da177e4
LT		 1980 spin_lock(&ift->lock);
1981 flags = ift->flags;
1982 if (ift->valid_lft > valid_lft &&
1983 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1984 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1985 if (ift->prefered_lft > prefered_lft &&
1986 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1987 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1988 spin_unlock(&ift->lock);
1989 if (!(flags&IFA_F_TENTATIVE))
1990 ipv6_ifa_notify(0, ift);
1991 }
1992
1993 if (create && in6_dev->cnf.use_tempaddr > 0) {
1994 /*
1995 * When a new public address is created as described in [ADDRCONF],
1996 * also create a new temporary address.
1997 */
1ab1457c 1998 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1999 ipv6_create_tempaddr(ifp, NULL);
2000 } else {
2001 read_unlock_bh(&in6_dev->lock);
2002 }
2003#endif
2004 in6_ifa_put(ifp);
2005 addrconf_verify(0);
2006 }
2007 }
2008 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2009 in6_dev_put(in6_dev);
2010}
2011
2012/*
2013 * Set destination address.
2014 * Special case for SIT interfaces where we create a new "virtual"
2015 * device.
2016 */
af284937 2017int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2018{
2019 struct in6_ifreq ireq;
2020 struct net_device *dev;
2021 int err = -EINVAL;
2022
2023 rtnl_lock();
2024
2025 err = -EFAULT;
2026 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2027 goto err_exit;
2028
af284937 2029 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2030
2031 err = -ENODEV;
2032 if (dev == NULL)
2033 goto err_exit;
2034
0be669bb 2035#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2036 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2037 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2038 struct ifreq ifr;
1da177e4
LT		 2039 struct ip_tunnel_parm p;
2040
2041 err = -EADDRNOTAVAIL;
2042 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2043 goto err_exit;
2044
2045 memset(&p, 0, sizeof(p));
2046 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2047 p.iph.saddr = 0;
2048 p.iph.version = 4;
2049 p.iph.ihl = 5;
2050 p.iph.protocol = IPPROTO_IPV6;
2051 p.iph.ttl = 64;
d20b3109 2052 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2053
5bc3eb7e
SH		 2054 if (ops->ndo_do_ioctl) {
2055 mm_segment_t oldfs = get_fs();
2056
2057 set_fs(KERNEL_DS);
2058 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2059 set_fs(oldfs);
2060 } else
2061 err = -EOPNOTSUPP;
1da177e4
LT		 2062
2063 if (err == 0) {
2064 err = -ENOBUFS;
af284937
DL		 2065 dev = __dev_get_by_name(net, p.name);
2066 if (!dev)
1da177e4
LT		 2067 goto err_exit;
2068 err = dev_open(dev);
2069 }
2070 }
0be669bb 2071#endif
1da177e4
LT		 2072
2073err_exit:
2074 rtnl_unlock();
2075 return err;
2076}
2077
2078/*
2079 * Manual configuration of address on an interface
2080 */
af284937 2081static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2082 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2083 __u32 valid_lft)
1da177e4
LT		 2084{
2085 struct inet6_ifaddr *ifp;
2086 struct inet6_dev *idev;
2087 struct net_device *dev;
2088 int scope;
6f704992
YH		 2089 u32 flags;
2090 clock_t expires;
4bed72e4 2091 unsigned long timeout;
1da177e4
LT		 2092
2093 ASSERT_RTNL();
1ab1457c 2094
24ef0da7
TG		 2095 if (plen > 128)
2096 return -EINVAL;
2097
0778769d
NT		 2098 /* check the lifetime */
2099 if (!valid_lft || prefered_lft > valid_lft)
2100 return -EINVAL;
2101
af284937
DL		 2102 dev = __dev_get_by_index(net, ifindex);
2103 if (!dev)
1da177e4 2104 return -ENODEV;
1ab1457c 2105
1da177e4
LT		 2106 if ((idev = addrconf_add_dev(dev)) == NULL)
2107 return -ENOBUFS;
2108
2109 scope = ipv6_addr_scope(pfx);
2110
4bed72e4
YH		 2111 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2112 if (addrconf_finite_timeout(timeout)) {
2113 expires = jiffies_to_clock_t(timeout * HZ);
2114 valid_lft = timeout;
6f704992 2115 flags = RTF_EXPIRES;
4bed72e4
YH		 2116 } else {
2117 expires = 0;
2118 flags = 0;
2119 ifa_flags |= IFA_F_PERMANENT;
6f704992 2120 }
0778769d 2121
4bed72e4
YH		 2122 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2123 if (addrconf_finite_timeout(timeout)) {
2124 if (timeout == 0)
2125 ifa_flags |= IFA_F_DEPRECATED;
2126 prefered_lft = timeout;
2127 }
0778769d
NT		 2128
2129 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2130
1da177e4 2131 if (!IS_ERR(ifp)) {
06aebfb7 2132 spin_lock_bh(&ifp->lock);
0778769d
NT		 2133 ifp->valid_lft = valid_lft;
2134 ifp->prefered_lft = prefered_lft;
2135 ifp->tstamp = jiffies;
06aebfb7 2136 spin_unlock_bh(&ifp->lock);
0778769d 2137
46d48046 2138 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2139 expires, flags);
95c385b4
NH		 2140 /*
2141 * Note that section 3.1 of RFC 4429 indicates
2142 * that the Optimistic flag should not be set for
2143 * manually configured addresses
2144 */
1da177e4
LT		 2145 addrconf_dad_start(ifp, 0);
2146 in6_ifa_put(ifp);
0778769d 2147 addrconf_verify(0);
1da177e4
LT		 2148 return 0;
2149 }
2150
2151 return PTR_ERR(ifp);
2152}
2153
af284937 2154static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2155 unsigned int plen)
1da177e4
LT		 2156{
2157 struct inet6_ifaddr *ifp;
2158 struct inet6_dev *idev;
2159 struct net_device *dev;
1ab1457c 2160
24ef0da7
TG		 2161 if (plen > 128)
2162 return -EINVAL;
2163
af284937
DL		 2164 dev = __dev_get_by_index(net, ifindex);
2165 if (!dev)
1da177e4
LT		 2166 return -ENODEV;
2167
2168 if ((idev = __in6_dev_get(dev)) == NULL)
2169 return -ENXIO;
2170
2171 read_lock_bh(&idev->lock);
502a2ffd 2172 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2173 if (ifp->prefix_len == plen &&
2174 ipv6_addr_equal(pfx, &ifp->addr)) {
2175 in6_ifa_hold(ifp);
2176 read_unlock_bh(&idev->lock);
1ab1457c 2177
1da177e4
LT		 2178 ipv6_del_addr(ifp);
2179
2180 /* If the last address is deleted administratively,
2181 disable IPv6 on this interface.
2182 */
502a2ffd 2183 if (list_empty(&idev->addr_list))
1da177e4
LT		 2184 addrconf_ifdown(idev->dev, 1);
2185 return 0;
2186 }
2187 }
2188 read_unlock_bh(&idev->lock);
2189 return -EADDRNOTAVAIL;
2190}
2191
2192
af284937 2193int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2194{
2195 struct in6_ifreq ireq;
2196 int err;
1ab1457c 2197
1da177e4
LT		 2198 if (!capable(CAP_NET_ADMIN))
2199 return -EPERM;
1ab1457c 2200
1da177e4
LT		 2201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2202 return -EFAULT;
2203
2204 rtnl_lock();
af284937
DL		 2205 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2206 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2207 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2208 rtnl_unlock();
2209 return err;
2210}
2211
af284937 2212int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2213{
2214 struct in6_ifreq ireq;
2215 int err;
1ab1457c 2216
1da177e4
LT		 2217 if (!capable(CAP_NET_ADMIN))
2218 return -EPERM;
2219
2220 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2221 return -EFAULT;
2222
2223 rtnl_lock();
af284937
DL		 2224 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2225 ireq.ifr6_prefixlen);
1da177e4
LT		 2226 rtnl_unlock();
2227 return err;
2228}
2229
b5f348e5
IJ		 2230static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2231 int plen, int scope)
2232{
2233 struct inet6_ifaddr *ifp;
2234
2235 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2236 if (!IS_ERR(ifp)) {
2237 spin_lock_bh(&ifp->lock);
2238 ifp->flags &= ~IFA_F_TENTATIVE;
2239 spin_unlock_bh(&ifp->lock);
2240 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2241 in6_ifa_put(ifp);
2242 }
2243}
2244
0be669bb 2245#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2246static void sit_add_v4_addrs(struct inet6_dev *idev)
2247{
1da177e4
LT		 2248 struct in6_addr addr;
2249 struct net_device *dev;
c346dca1 2250 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2251 int scope;
2252
2253 ASSERT_RTNL();
2254
2255 memset(&addr, 0, sizeof(struct in6_addr));
2256 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2257
2258 if (idev->dev->flags&IFF_POINTOPOINT) {
2259 addr.s6_addr32[0] = htonl(0xfe800000);
2260 scope = IFA_LINK;
2261 } else {
2262 scope = IPV6_ADDR_COMPATv4;
2263 }
2264
2265 if (addr.s6_addr32[3]) {
b5f348e5 2266 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2267 return;
2268 }
2269
6fda7350 2270 for_each_netdev(net, dev) {
e5ed6399 2271 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2272 if (in_dev && (dev->flags & IFF_UP)) {
2273 struct in_ifaddr * ifa;
2274
2275 int flag = scope;
2276
2277 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2278 int plen;
2279
2280 addr.s6_addr32[3] = ifa->ifa_local;
2281
2282 if (ifa->ifa_scope == RT_SCOPE_LINK)
2283 continue;
2284 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2285 if (idev->dev->flags&IFF_POINTOPOINT)
2286 continue;
2287 flag |= IFA_HOST;
2288 }
2289 if (idev->dev->flags&IFF_POINTOPOINT)
2290 plen = 64;
2291 else
2292 plen = 96;
2293
b5f348e5 2294 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2295 }
2296 }
1ab1457c 2297 }
1da177e4 2298}
0be669bb 2299#endif
1da177e4
LT		 2300
2301static void init_loopback(struct net_device *dev)
2302{
2303 struct inet6_dev *idev;
1da177e4
LT		 2304
2305 /* ::1 */
2306
2307 ASSERT_RTNL();
2308
2309 if ((idev = ipv6_find_idev(dev)) == NULL) {
2310 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2311 return;
2312 }
2313
b5f348e5 2314 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2315}
2316
2317static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2318{
2319 struct inet6_ifaddr * ifp;
95c385b4
NH		 2320 u32 addr_flags = IFA_F_PERMANENT;
2321
2322#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2323 if (idev->cnf.optimistic_dad &&
702beb87 2324 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2325 addr_flags |= IFA_F_OPTIMISTIC;
2326#endif
1da177e4 2327
95c385b4
NH		 2328
2329 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2330 if (!IS_ERR(ifp)) {
46d48046 2331 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2332 addrconf_dad_start(ifp, 0);
2333 in6_ifa_put(ifp);
2334 }
2335}
2336
2337static void addrconf_dev_config(struct net_device *dev)
2338{
2339 struct in6_addr addr;
2340 struct inet6_dev * idev;
2341
2342 ASSERT_RTNL();
2343
74235a25
HX		 2344 if ((dev->type != ARPHRD_ETHER) &&
2345 (dev->type != ARPHRD_FDDI) &&
2346 (dev->type != ARPHRD_IEEE802_TR) &&
2347 (dev->type != ARPHRD_ARCNET) &&
2348 (dev->type != ARPHRD_INFINIBAND)) {
2349 /* Alas, we support only Ethernet autoconfiguration. */
2350 return;
2351 }
2352
1da177e4
LT		 2353 idev = addrconf_add_dev(dev);
2354 if (idev == NULL)
2355 return;
2356
2357 memset(&addr, 0, sizeof(struct in6_addr));
2358 addr.s6_addr32[0] = htonl(0xFE800000);
2359
2360 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2361 addrconf_add_linklocal(idev, &addr);
2362}
2363
0be669bb 2364#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2365static void addrconf_sit_config(struct net_device *dev)
2366{
2367 struct inet6_dev *idev;
2368
2369 ASSERT_RTNL();
2370
1ab1457c
YH		 2371 /*
2372 * Configure the tunnel with one of our IPv4
2373 * addresses... we should configure all of
1da177e4
LT		 2374 * our v4 addrs in the tunnel
2375 */
2376
2377 if ((idev = ipv6_find_idev(dev)) == NULL) {
2378 printk(KERN_DEBUG "init sit: add_dev failed\n");
2379 return;
2380 }
2381
c7dc89c0
FT		 2382 if (dev->priv_flags & IFF_ISATAP) {
2383 struct in6_addr addr;
2384
2385 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2386 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2387 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2388 addrconf_add_linklocal(idev, &addr);
2389 return;
2390 }
2391
1da177e4
LT		 2392 sit_add_v4_addrs(idev);
2393
2394 if (dev->flags&IFF_POINTOPOINT) {
2395 addrconf_add_mroute(dev);
2396 addrconf_add_lroute(dev);
2397 } else
2398 sit_route_add(dev);
2399}
0be669bb 2400#endif
1da177e4
LT		 2401
2402static inline int
2403ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2404{
2405 struct in6_addr lladdr;
2406
95c385b4 2407 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2408 addrconf_add_linklocal(idev, &lladdr);
2409 return 0;
2410 }
2411 return -1;
2412}
2413
2414static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2415{
2416 struct net_device *link_dev;
c346dca1 2417 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2418
2419 /* first try to inherit the link-local address from the link device */
2420 if (idev->dev->iflink &&
6fda7350 2421 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2422 if (!ipv6_inherit_linklocal(idev, link_dev))
2423 return;
2424 }
2425 /* then try to inherit it from any device */
6fda7350 2426 for_each_netdev(net, link_dev) {
1da177e4
LT		 2427 if (!ipv6_inherit_linklocal(idev, link_dev))
2428 return;
2429 }
2430 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2431}
2432
2433/*
2434 * Autoconfigure tunnel with a link-local address so routing protocols,
2435 * DHCPv6, MLD etc. can be run over the virtual link
2436 */
2437
2438static void addrconf_ip6_tnl_config(struct net_device *dev)
2439{
2440 struct inet6_dev *idev;
2441
2442 ASSERT_RTNL();
2443
e21e8467
SH		 2444 idev = addrconf_add_dev(dev);
2445 if (!idev) {
1da177e4
LT		 2446 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2447 return;
2448 }
2449 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2450}
2451
1ab1457c 2452static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2453 void * data)
2454{
2455 struct net_device *dev = (struct net_device *) data;
74235a25 2456 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2457 int run_pending = 0;
b217d616 2458 int err;
1da177e4 2459
e21e8467 2460 switch (event) {
45ba9dd2 2461 case NETDEV_REGISTER:
74235a25 2462 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2463 idev = ipv6_add_dev(dev);
2464 if (!idev)
b217d616 2465 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2466 }
2467 break;
bcdd553f 2468
1da177e4 2469 case NETDEV_UP:
3c21edbd 2470 case NETDEV_CHANGE:
c2edacf8
JV		 2471 if (dev->flags & IFF_SLAVE)
2472 break;
2473
3c21edbd 2474 if (event == NETDEV_UP) {
f24e3d65 2475 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2476 /* device is not ready yet. */
2477 printk(KERN_INFO
2478 "ADDRCONF(NETDEV_UP): %s: "
2479 "link is not ready\n",
2480 dev->name);
2481 break;
2482 }
99081049 2483
d31c7b8f
EP		 2484 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2485 idev = ipv6_add_dev(dev);
2486
e3ec6cfc 2487 if (idev) {
99081049 2488 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2489 run_pending = 1;
2490 }
3c21edbd 2491 } else {
f24e3d65 2492 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2493 /* device is still not ready. */
2494 break;
2495 }
2496
2497 if (idev) {
bcdd553f 2498 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2499 /* device is already configured. */
2500 break;
3c21edbd
YH		 2501 idev->if_flags |= IF_READY;
2502 }
2503
2504 printk(KERN_INFO
2505 "ADDRCONF(NETDEV_CHANGE): %s: "
2506 "link becomes ready\n",
2507 dev->name);
2508
c5e33bdd 2509 run_pending = 1;
3c21edbd
YH		 2510 }
2511
e21e8467 2512 switch (dev->type) {
0be669bb 2513#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2514 case ARPHRD_SIT:
2515 addrconf_sit_config(dev);
2516 break;
0be669bb 2517#endif
1da177e4
LT		 2518 case ARPHRD_TUNNEL6:
2519 addrconf_ip6_tnl_config(dev);
2520 break;
2521 case ARPHRD_LOOPBACK:
2522 init_loopback(dev);
2523 break;
2524
2525 default:
2526 addrconf_dev_config(dev);
2527 break;
3ff50b79 2528 }
bcdd553f 2529
1da177e4 2530 if (idev) {
c5e33bdd
YH		 2531 if (run_pending)
2532 addrconf_dad_run(idev);
2533
bcdd553f
SH		 2534 /*
2535 * If the MTU changed during the interface down,
2536 * when the interface up, the changed MTU must be
2537 * reflected in the idev as well as routers.
1da177e4 2538 */
bcdd553f
SH		 2539 if (idev->cnf.mtu6 != dev->mtu &&
2540 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2541 rt6_mtu_change(dev, dev->mtu);
2542 idev->cnf.mtu6 = dev->mtu;
2543 }
2544 idev->tstamp = jiffies;
2545 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2546
2547 /*
2548 * If the changed mtu during down is lower than
2549 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2550 */
2551 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2552 addrconf_ifdown(dev, 1);
1da177e4
LT		 2553 }
2554 break;
2555
2556 case NETDEV_CHANGEMTU:
d31c7b8f 2557 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2558 rt6_mtu_change(dev, dev->mtu);
2559 idev->cnf.mtu6 = dev->mtu;
2560 break;
2561 }
2562
d31c7b8f
EP		 2563 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2564 idev = ipv6_add_dev(dev);
2565 if (idev)
2566 break;
2567 }
2568
bcdd553f
SH		 2569 /*
2570 * MTU falled under IPV6_MIN_MTU.
2571 * Stop IPv6 on this interface.
2572 */
1da177e4
LT		 2573
2574 case NETDEV_DOWN:
2575 case NETDEV_UNREGISTER:
2576 /*
2577 * Remove all addresses from this interface.
2578 */
2579 addrconf_ifdown(dev, event != NETDEV_DOWN);
2580 break;
3c21edbd 2581
1da177e4 2582 case NETDEV_CHANGENAME:
1da177e4 2583 if (idev) {
5632c515 2584 snmp6_unregister_dev(idev);
408c4768 2585 addrconf_sysctl_unregister(idev);
f52295a9 2586 addrconf_sysctl_register(idev);
b217d616
HX		 2587 err = snmp6_register_dev(idev);
2588 if (err)
2589 return notifier_from_errno(err);
5632c515 2590 }
1da177e4 2591 break;
bcdd553f 2592
93d9b7d7
JP		 2593 case NETDEV_PRE_TYPE_CHANGE:
2594 case NETDEV_POST_TYPE_CHANGE:
2595 addrconf_type_change(dev, event);
75c78500 2596 break;
3ff50b79 2597 }
1da177e4
LT		 2598
2599 return NOTIFY_OK;
2600}
2601
2602/*
2603 * addrconf module should be notified of a device going up
2604 */
2605static struct notifier_block ipv6_dev_notf = {
2606 .notifier_call = addrconf_notify,
1da177e4
LT		 2607};
2608
93d9b7d7 2609static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2610{
2611 struct inet6_dev *idev;
2612 ASSERT_RTNL();
2613
2614 idev = __in6_dev_get(dev);
2615
93d9b7d7 2616 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2617 ipv6_mc_remap(idev);
93d9b7d7 2618 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2619 ipv6_mc_unmap(idev);
2620}
2621
1da177e4
LT		 2622static int addrconf_ifdown(struct net_device *dev, int how)
2623{
c346dca1 2624 struct net *net = dev_net(dev);
502a2ffd 2625 struct inet6_dev *idev;
2626 struct inet6_ifaddr *ifa;
2627 LIST_HEAD(keep_list);
1da177e4
LT		 2628
2629 ASSERT_RTNL();
2630
f3db4851 2631 rt6_ifdown(net, dev);
1da177e4
LT		 2632 neigh_ifdown(&nd_tbl, dev);
2633
2634 idev = __in6_dev_get(dev);
2635 if (idev == NULL)
2636 return -ENODEV;
2637
bcdd553f
SH		 2638 /*
2639 * Step 1: remove reference to ipv6 device from parent device.
2640 * Do not dev_put!
1da177e4 2641 */
439e2385 2642 if (how) {
1da177e4 2643 idev->dead = 1;
8814c4b5
YH		 2644
2645 /* protected by rtnl_lock */
2646 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2647
2648 /* Step 1.5: remove snmp6 entry */
2649 snmp6_unregister_dev(idev);
2650
2651 }
2652
1da177e4
LT		 2653 write_lock_bh(&idev->lock);
2654
bcdd553f 2655 /* Step 2: clear flags for stateless addrconf */
439e2385 2656 if (!how)
3c21edbd 2657 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2658
1da177e4 2659#ifdef CONFIG_IPV6_PRIVACY
439e2385 2660 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2661 in6_dev_put(idev);
2662
bcdd553f 2663 /* Step 3: clear tempaddr list */
372e6c8f 2664 while (!list_empty(&idev->tempaddr_list)) {
2665 ifa = list_first_entry(&idev->tempaddr_list,
2666 struct inet6_ifaddr, tmp_list);
2667 list_del(&ifa->tmp_list);
1da177e4
LT		 2668 ifa->dead = 1;
2669 write_unlock_bh(&idev->lock);
2670 spin_lock_bh(&ifa->lock);
2671
2672 if (ifa->ifpub) {
2673 in6_ifa_put(ifa->ifpub);
2674 ifa->ifpub = NULL;
2675 }
2676 spin_unlock_bh(&ifa->lock);
2677 in6_ifa_put(ifa);
2678 write_lock_bh(&idev->lock);
2679 }
2680#endif
8f37ada5 2681
502a2ffd 2682 while (!list_empty(&idev->addr_list)) {
2683 ifa = list_first_entry(&idev->addr_list,
2684 struct inet6_ifaddr, if_list);
84e8b803 2685 addrconf_del_timer(ifa);
2686
2687 /* If just doing link down, and address is permanent
2688 and not link-local, then retain it. */
bcdd553f 2689 if (!how &&
84e8b803 2690 (ifa->flags&IFA_F_PERMANENT) &&
2691 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2692 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2693
84e8b803 2694 /* If not doing DAD on this address, just keep it. */
2695 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2696 idev->cnf.accept_dad <= 0 ||
2697 (ifa->flags & IFA_F_NODAD))
2698 continue;
2699
2700 /* If it was tentative already, no need to notify */
2701 if (ifa->flags & IFA_F_TENTATIVE)
2702 continue;
2703
2704 /* Flag it for later restoration when link comes up */
2705 ifa->flags |= IFA_F_TENTATIVE;
2706 in6_ifa_hold(ifa);
dc2b99f7 2707 } else {
502a2ffd 2708 list_del(&ifa->if_list);
dc2b99f7 2709 ifa->dead = 1;
84e8b803 2710 }
2711 write_unlock_bh(&idev->lock);
1da177e4 2712
c2e21293 2713 /* clear hash table */
5c578aed 2714 spin_lock_bh(&addrconf_hash_lock);
2715 hlist_del_init_rcu(&ifa->addr_lst);
c2e21293 2716 __in6_ifa_put(ifa);
5c578aed 2717 spin_unlock_bh(&addrconf_hash_lock);
c2e21293 2718
84e8b803 2719 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2720 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2721 in6_ifa_put(ifa);
dc2b99f7 2722
84e8b803 2723 write_lock_bh(&idev->lock);
1da177e4 2724 }
8f37ada5 2725
502a2ffd 2726 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2727
1da177e4
LT		 2728 write_unlock_bh(&idev->lock);
2729
2730 /* Step 5: Discard multicast list */
439e2385 2731 if (how)
1da177e4
LT		 2732 ipv6_mc_destroy_dev(idev);
2733 else
2734 ipv6_mc_down(idev);
2735
1da177e4 2736 idev->tstamp = jiffies;
1ab1457c 2737
bcdd553f 2738 /* Last: Shot the device (if unregistered) */
439e2385 2739 if (how) {
408c4768 2740 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2741 neigh_parms_release(&nd_tbl, idev->nd_parms);
2742 neigh_ifdown(&nd_tbl, dev);
2743 in6_dev_put(idev);
2744 }
2745 return 0;
2746}
2747
2748static void addrconf_rs_timer(unsigned long data)
2749{
2750 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2751 struct inet6_dev *idev = ifp->idev;
1da177e4 2752
5b2a1953 2753 read_lock(&idev->lock);
2754 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2755 goto out;
2756
5b2a1953 2757 if (idev->cnf.forwarding)
2758 goto out;
2759
2760 /* Announcement received after solicitation was sent */
2761 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2762 goto out;
1da177e4
LT		 2763
2764 spin_lock(&ifp->lock);
5b2a1953 2765 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2766 /* The wait after the last probe can be shorter */
2767 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2768 (ifp->probes == idev->cnf.rtr_solicits) ?
2769 idev->cnf.rtr_solicit_delay :
2770 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2771 spin_unlock(&ifp->lock);
2772
5b2a1953 2773 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2774 } else {
2775 spin_unlock(&ifp->lock);
2776 /*
2777 * Note: we do not support deprecated "all on-link"
2778 * assumption any longer.
2779 */
2780 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2781 idev->dev->name);
1da177e4
LT		 2782 }
2783
2784out:
5b2a1953 2785 read_unlock(&idev->lock);
1da177e4
LT		 2786 in6_ifa_put(ifp);
2787}
2788
2789/*
2790 * Duplicate Address Detection
2791 */
3c21edbd
YH		 2792static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2793{
2794 unsigned long rand_num;
2795 struct inet6_dev *idev = ifp->idev;
2796
95c385b4
NH		 2797 if (ifp->flags & IFA_F_OPTIMISTIC)
2798 rand_num = 0;
2799 else
2800 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2801
3c21edbd
YH		 2802 ifp->probes = idev->cnf.dad_transmits;
2803 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2804}
2805
e431b8c0 2806static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2807{
2808 struct inet6_dev *idev = ifp->idev;
2809 struct net_device *dev = idev->dev;
1da177e4
LT		 2810
2811 addrconf_join_solict(dev, &ifp->addr);
2812
1da177e4 2813 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2814
2815 read_lock_bh(&idev->lock);
2816 if (ifp->dead)
2817 goto out;
1da177e4 2818
21809faf 2819 spin_lock(&ifp->lock);
1da177e4 2820 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2821 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2822 !(ifp->flags&IFA_F_TENTATIVE) ||
2823 ifp->flags & IFA_F_NODAD) {
cc411d0b 2824 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2825 spin_unlock(&ifp->lock);
1da177e4
LT		 2826 read_unlock_bh(&idev->lock);
2827
2828 addrconf_dad_completed(ifp);
2829 return;
2830 }
2831
6732bade 2832 if (!(idev->if_flags & IF_READY)) {
21809faf 2833 spin_unlock(&ifp->lock);
6732bade 2834 read_unlock_bh(&idev->lock);
3c21edbd 2835 /*
590a9887 2836 * If the device is not ready:
3c21edbd
YH		 2837 * - keep it tentative if it is a permanent address.
2838 * - otherwise, kill it.
2839 */
2840 in6_ifa_hold(ifp);
cc411d0b 2841 addrconf_dad_stop(ifp, 0);
6732bade 2842 return;
3c21edbd 2843 }
95c385b4
NH		 2844
2845 /*
2846 * Optimistic nodes can start receiving
2847 * Frames right away
2848 */
e21e8467 2849 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2850 ip6_ins_rt(ifp->rt);
2851
6732bade 2852 addrconf_dad_kick(ifp);
21809faf 2853 spin_unlock(&ifp->lock);
1da177e4
LT		 2854out:
2855 read_unlock_bh(&idev->lock);
2856}
2857
2858static void addrconf_dad_timer(unsigned long data)
2859{
2860 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2861 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2862 struct in6_addr mcaddr;
2863
122e4519 2864 read_lock(&idev->lock);
2865 if (idev->dead || !(idev->if_flags & IF_READY)) {
2866 read_unlock(&idev->lock);
1da177e4
LT		 2867 goto out;
2868 }
21809faf 2869
2870 spin_lock(&ifp->lock);
1da177e4
LT		 2871 if (ifp->probes == 0) {
2872 /*
2873 * DAD was successful
2874 */
2875
cc411d0b 2876 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2877 spin_unlock(&ifp->lock);
122e4519 2878 read_unlock(&idev->lock);
1da177e4
LT		 2879
2880 addrconf_dad_completed(ifp);
2881
2882 goto out;
2883 }
2884
2885 ifp->probes--;
2886 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2887 spin_unlock(&ifp->lock);
122e4519 2888 read_unlock(&idev->lock);
1da177e4
LT		 2889
2890 /* send a neighbour solicitation for our addr */
1da177e4 2891 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2892 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2893out:
2894 in6_ifa_put(ifp);
2895}
2896
2897static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2898{
e21e8467 2899 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2900
2901 /*
2902 * Configure the address for reception. Now it is valid.
2903 */
2904
2905 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2906
2907 /* If added prefix is link local and forwarding is off,
2908 start sending router solicitations.
2909 */
2910
2911 if (ifp->idev->cnf.forwarding == 0 &&
2912 ifp->idev->cnf.rtr_solicits > 0 &&
2913 (dev->flags&IFF_LOOPBACK) == 0 &&
2914 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2915 /*
2916 * If a host as already performed a random delay
2917 * [...] as part of DAD [...] there is no need
2918 * to delay again before sending the first RS
2919 */
f3ee4010 2920 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2921
2922 spin_lock_bh(&ifp->lock);
2923 ifp->probes = 1;
2924 ifp->idev->if_flags |= IF_RS_SENT;
2925 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2926 spin_unlock_bh(&ifp->lock);
2927 }
2928}
2929
e21e8467
SH		 2930static void addrconf_dad_run(struct inet6_dev *idev)
2931{
c5e33bdd
YH		 2932 struct inet6_ifaddr *ifp;
2933
2934 read_lock_bh(&idev->lock);
502a2ffd 2935 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2936 spin_lock(&ifp->lock);
c5e33bdd 2937 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2938 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2939 continue;
2940 }
21809faf 2941 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2942 addrconf_dad_kick(ifp);
2943 }
2944 read_unlock_bh(&idev->lock);
2945}
2946
1da177e4
LT		 2947#ifdef CONFIG_PROC_FS
2948struct if6_iter_state {
3c40090a 2949 struct seq_net_private p;
1da177e4
LT		 2950 int bucket;
2951};
2952
2953static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2954{
2955 struct inet6_ifaddr *ifa = NULL;
2956 struct if6_iter_state *state = seq->private;
1218854a 2957 struct net *net = seq_file_net(seq);
1da177e4
LT		 2958
2959 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 2960 struct hlist_node *n;
5c578aed 2961 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2962 addr_lst)
c2e21293 2963 if (net_eq(dev_net(ifa->idev->dev), net))
2964 return ifa;
1da177e4 2965 }
c2e21293 2966 return NULL;
1da177e4
LT		 2967}
2968
c2e21293 2969static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2970 struct inet6_ifaddr *ifa)
1da177e4
LT		 2971{
2972 struct if6_iter_state *state = seq->private;
1218854a 2973 struct net *net = seq_file_net(seq);
c2e21293 2974 struct hlist_node *n = &ifa->addr_lst;
1da177e4 2975
5c578aed 2976 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
c2e21293 2977 if (net_eq(dev_net(ifa->idev->dev), net))
2978 return ifa;
3c40090a 2979
c2e21293 2980 while (++state->bucket < IN6_ADDR_HSIZE) {
2981 hlist_for_each_entry(ifa, n,
2982 &inet6_addr_lst[state->bucket], addr_lst) {
2983 if (net_eq(dev_net(ifa->idev->dev), net))
2984 return ifa;
2985 }
1da177e4 2986 }
3c40090a 2987
c2e21293 2988 return NULL;
1da177e4
LT		 2989}
2990
2991static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2992{
2993 struct inet6_ifaddr *ifa = if6_get_first(seq);
2994
2995 if (ifa)
e21e8467 2996 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 2997 --pos;
2998 return pos ? NULL : ifa;
2999}
3000
3001static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
5c578aed 3002 __acquires(rcu)
1da177e4 3003{
5c578aed 3004 rcu_read_lock_bh();
1da177e4
LT		 3005 return if6_get_idx(seq, *pos);
3006}
3007
3008static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3009{
3010 struct inet6_ifaddr *ifa;
3011
3012 ifa = if6_get_next(seq, v);
3013 ++*pos;
3014 return ifa;
3015}
3016
3017static void if6_seq_stop(struct seq_file *seq, void *v)
5c578aed 3018 __releases(rcu)
1da177e4 3019{
5c578aed 3020 rcu_read_unlock_bh();
1da177e4
LT		 3021}
3022
3023static int if6_seq_show(struct seq_file *seq, void *v)
3024{
3025 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3026 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3027 &ifp->addr,
1da177e4
LT		 3028 ifp->idev->dev->ifindex,
3029 ifp->prefix_len,
3030 ifp->scope,
3031 ifp->flags,
3032 ifp->idev->dev->name);
3033 return 0;
3034}
3035
56b3d975 3036static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3037 .start = if6_seq_start,
3038 .next = if6_seq_next,
3039 .show = if6_seq_show,
3040 .stop = if6_seq_stop,
3041};
3042
3043static int if6_seq_open(struct inode *inode, struct file *file)
3044{
3c40090a
DL		 3045 return seq_open_net(inode, file, &if6_seq_ops,
3046 sizeof(struct if6_iter_state));
1da177e4
LT		 3047}
3048
9a32144e 3049static const struct file_operations if6_fops = {
1da177e4
LT		 3050 .owner = THIS_MODULE,
3051 .open = if6_seq_open,
3052 .read = seq_read,
3053 .llseek = seq_lseek,
3c40090a 3054 .release = seq_release_net,
1da177e4
LT		 3055};
3056
2c8c1e72 3057static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3058{
3c40090a 3059 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3060 return -ENOMEM;
3061 return 0;
3062}
3063
2c8c1e72 3064static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3065{
3066 proc_net_remove(net, "if_inet6");
3067}
3068
3069static struct pernet_operations if6_proc_net_ops = {
3070 .init = if6_proc_net_init,
3071 .exit = if6_proc_net_exit,
3072};
3073
3074int __init if6_proc_init(void)
3075{
3076 return register_pernet_subsys(&if6_proc_net_ops);
3077}
3078
1da177e4
LT		 3079void if6_proc_exit(void)
3080{
3c40090a 3081 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3082}
3083#endif /* CONFIG_PROC_FS */
3084
59fbb3a6 3085#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3086/* Check if address is a home address configured on any interface. */
389f6612 3087int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3088{
3089 int ret = 0;
c2e21293 3090 struct inet6_ifaddr *ifp = NULL;
3091 struct hlist_node *n;
3a88a81d 3092 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3093
5c578aed 3094 rcu_read_lock_bh();
3095 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3096 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3097 continue;
caad295f 3098 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3099 (ifp->flags & IFA_F_HOMEADDRESS)) {
3100 ret = 1;
3101 break;
3102 }
3103 }
5c578aed 3104 rcu_read_unlock_bh();
3b9f9a1c
NT		 3105 return ret;
3106}
3107#endif
3108
1da177e4
LT		 3109/*
3110 * Periodic address status verification
3111 */
3112
3113static void addrconf_verify(unsigned long foo)
3114{
b2db7564 3115 unsigned long now, next, next_sec, next_sched;
1da177e4 3116 struct inet6_ifaddr *ifp;
c2e21293 3117 struct hlist_node *node;
1da177e4
LT		 3118 int i;
3119
5c578aed 3120 rcu_read_lock_bh();
3121 spin_lock(&addrconf_verify_lock);
1da177e4 3122 now = jiffies;
b2db7564 3123 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3124
3125 del_timer(&addr_chk_timer);
3126
bcdd553f 3127 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3128restart:
5c578aed 3129 hlist_for_each_entry_rcu(ifp, node,
3130 &inet6_addr_lst[i], addr_lst) {
1da177e4 3131 unsigned long age;
1da177e4
LT		 3132
3133 if (ifp->flags & IFA_F_PERMANENT)
3134 continue;
3135
3136 spin_lock(&ifp->lock);
b2db7564
YH		 3137 /* We try to batch several events at once. */
3138 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3139
8f27ebb9
YH		 3140 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3141 age >= ifp->valid_lft) {
1da177e4
LT		 3142 spin_unlock(&ifp->lock);
3143 in6_ifa_hold(ifp);
1da177e4
LT		 3144 ipv6_del_addr(ifp);
3145 goto restart;
8f27ebb9
YH		 3146 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3147 spin_unlock(&ifp->lock);
3148 continue;
1da177e4 3149 } else if (age >= ifp->prefered_lft) {
a1ed0526 3150 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3151 int deprecate = 0;
3152
3153 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3154 deprecate = 1;
3155 ifp->flags |= IFA_F_DEPRECATED;
3156 }
3157
3158 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3159 next = ifp->tstamp + ifp->valid_lft * HZ;
3160
3161 spin_unlock(&ifp->lock);
3162
3163 if (deprecate) {
3164 in6_ifa_hold(ifp);
1da177e4
LT		 3165
3166 ipv6_ifa_notify(0, ifp);
3167 in6_ifa_put(ifp);
3168 goto restart;
3169 }
3170#ifdef CONFIG_IPV6_PRIVACY
3171 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3172 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3173 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3174 ifp->idev->cnf.dad_transmits *
3175 ifp->idev->nd_parms->retrans_time / HZ;
3176
1da177e4
LT		 3177 if (age >= ifp->prefered_lft - regen_advance) {
3178 struct inet6_ifaddr *ifpub = ifp->ifpub;
3179 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3180 next = ifp->tstamp + ifp->prefered_lft * HZ;
3181 if (!ifp->regen_count && ifpub) {
3182 ifp->regen_count++;
3183 in6_ifa_hold(ifp);
3184 in6_ifa_hold(ifpub);
3185 spin_unlock(&ifp->lock);
5c578aed 3186
291d809b
HY		 3187 spin_lock(&ifpub->lock);
3188 ifpub->regen_count = 0;
3189 spin_unlock(&ifpub->lock);
1da177e4
LT		 3190 ipv6_create_tempaddr(ifpub, ifp);
3191 in6_ifa_put(ifpub);
3192 in6_ifa_put(ifp);
3193 goto restart;
3194 }
3195 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3196 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3197 spin_unlock(&ifp->lock);
3198#endif
3199 } else {
3200 /* ifp->prefered_lft <= ifp->valid_lft */
3201 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3202 next = ifp->tstamp + ifp->prefered_lft * HZ;
3203 spin_unlock(&ifp->lock);
3204 }
3205 }
1da177e4
LT		 3206 }
3207
b2db7564
YH		 3208 next_sec = round_jiffies_up(next);
3209 next_sched = next;
3210
3211 /* If rounded timeout is accurate enough, accept it. */
3212 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3213 next_sched = next_sec;
3214
3215 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3216 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3217 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3218
3219 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3220 now, next, next_sec, next_sched));
3221
3222 addr_chk_timer.expires = next_sched;
1da177e4 3223 add_timer(&addr_chk_timer);
5c578aed 3224 spin_unlock(&addrconf_verify_lock);
3225 rcu_read_unlock_bh();
1da177e4
LT		 3226}
3227
461d8837
TG		 3228static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3229{
3230 struct in6_addr *pfx = NULL;
3231
3232 if (addr)
3233 pfx = nla_data(addr);
3234
3235 if (local) {
3236 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3237 pfx = NULL;
3238 else
3239 pfx = nla_data(local);
3240 }
3241
3242 return pfx;
3243}
3244
ef7c79ed 3245static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3246 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3247 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3248 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3249};
3250
1da177e4
LT		 3251static int
3252inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3253{
3b1e0a65 3254 struct net *net = sock_net(skb->sk);
b933f716
TG		 3255 struct ifaddrmsg *ifm;
3256 struct nlattr *tb[IFA_MAX+1];
1da177e4 3257 struct in6_addr *pfx;
b933f716 3258 int err;
1da177e4 3259
b933f716
TG		 3260 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3261 if (err < 0)
3262 return err;
3263
3264 ifm = nlmsg_data(nlh);
3265 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3266 if (pfx == NULL)
3267 return -EINVAL;
3268
af284937 3269 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3270}
3271
55ebaef1
NT		 3272static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3273 u32 prefered_lft, u32 valid_lft)
081bba5b 3274{
6f704992
YH		 3275 u32 flags;
3276 clock_t expires;
4bed72e4 3277 unsigned long timeout;
46d48046 3278
081bba5b
NT		 3279 if (!valid_lft || (prefered_lft > valid_lft))
3280 return -EINVAL;
3281
4bed72e4
YH		 3282 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3283 if (addrconf_finite_timeout(timeout)) {
3284 expires = jiffies_to_clock_t(timeout * HZ);
3285 valid_lft = timeout;
6f704992 3286 flags = RTF_EXPIRES;
4bed72e4
YH		 3287 } else {
3288 expires = 0;
3289 flags = 0;
3290 ifa_flags |= IFA_F_PERMANENT;
6f704992 3291 }
081bba5b 3292
4bed72e4
YH		 3293 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3294 if (addrconf_finite_timeout(timeout)) {
3295 if (timeout == 0)
3296 ifa_flags |= IFA_F_DEPRECATED;
3297 prefered_lft = timeout;
3298 }
081bba5b
NT		 3299
3300 spin_lock_bh(&ifp->lock);
3b9f9a1c 3301 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3302 ifp->tstamp = jiffies;
3303 ifp->valid_lft = valid_lft;
3304 ifp->prefered_lft = prefered_lft;
3305
3306 spin_unlock_bh(&ifp->lock);
3307 if (!(ifp->flags&IFA_F_TENTATIVE))
3308 ipv6_ifa_notify(0, ifp);
081bba5b 3309
46d48046 3310 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3311 expires, flags);
081bba5b
NT		 3312 addrconf_verify(0);
3313
3314 return 0;
3315}
3316
1da177e4
LT		 3317static int
3318inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3319{
3b1e0a65 3320 struct net *net = sock_net(skb->sk);
461d8837
TG		 3321 struct ifaddrmsg *ifm;
3322 struct nlattr *tb[IFA_MAX+1];
1da177e4 3323 struct in6_addr *pfx;
7198f8ce
TG		 3324 struct inet6_ifaddr *ifa;
3325 struct net_device *dev;
55ebaef1
NT		 3326 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3327 u8 ifa_flags;
461d8837 3328 int err;
1da177e4 3329
461d8837
TG		 3330 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3331 if (err < 0)
3332 return err;
3333
3334 ifm = nlmsg_data(nlh);
3335 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3336 if (pfx == NULL)
3337 return -EINVAL;
3338
461d8837 3339 if (tb[IFA_CACHEINFO]) {
0778769d 3340 struct ifa_cacheinfo *ci;
461d8837
TG		 3341
3342 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3343 valid_lft = ci->ifa_valid;
461d8837
TG		 3344 preferred_lft = ci->ifa_prefered;
3345 } else {
3346 preferred_lft = INFINITY_LIFE_TIME;
3347 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3348 }
3349
af284937 3350 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3351 if (dev == NULL)
3352 return -ENODEV;
3353
55ebaef1 3354 /* We ignore other flags so far. */
3b9f9a1c 3355 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3356
1cab3da6 3357 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3358 if (ifa == NULL) {
3359 /*
3360 * It would be best to check for !NLM_F_CREATE here but
3361 * userspace alreay relies on not having to provide this.
3362 */
af284937
DL		 3363 return inet6_addr_add(net, ifm->ifa_index, pfx,
3364 ifm->ifa_prefixlen, ifa_flags,
3365 preferred_lft, valid_lft);
081bba5b
NT		 3366 }
3367
7198f8ce
TG		 3368 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3369 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3370 err = -EEXIST;
3371 else
55ebaef1 3372 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3373
3374 in6_ifa_put(ifa);
3375
3376 return err;
1da177e4
LT		 3377}
3378
101bb229
TG		 3379static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3380 u8 scope, int ifindex)
3381{
3382 struct ifaddrmsg *ifm;
3383
3384 ifm = nlmsg_data(nlh);
3385 ifm->ifa_family = AF_INET6;
3386 ifm->ifa_prefixlen = prefixlen;
3387 ifm->ifa_flags = flags;
3388 ifm->ifa_scope = scope;
3389 ifm->ifa_index = ifindex;
3390}
3391
85486af0
TG		 3392static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3393 unsigned long tstamp, u32 preferred, u32 valid)
3394{
3395 struct ifa_cacheinfo ci;
3396
3397 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3398 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3399 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3400 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3401 ci.ifa_prefered = preferred;
3402 ci.ifa_valid = valid;
3403
3404 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3405}
3406
101bb229
TG		 3407static inline int rt_scope(int ifa_scope)
3408{
3409 if (ifa_scope & IFA_HOST)
3410 return RT_SCOPE_HOST;
3411 else if (ifa_scope & IFA_LINK)
3412 return RT_SCOPE_LINK;
3413 else if (ifa_scope & IFA_SITE)
3414 return RT_SCOPE_SITE;
3415 else
3416 return RT_SCOPE_UNIVERSE;
3417}
3418
0ab6803b
TG		 3419static inline int inet6_ifaddr_msgsize(void)
3420{
339bf98f
TG		 3421 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3422 + nla_total_size(16) /* IFA_ADDRESS */
3423 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3424}
c5396a31 3425
1da177e4 3426static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3427 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3428{
1da177e4 3429 struct nlmsghdr *nlh;
85486af0 3430 u32 preferred, valid;
1da177e4 3431
0ab6803b
TG		 3432 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3433 if (nlh == NULL)
26932566 3434 return -EMSGSIZE;
0ab6803b 3435
101bb229
TG		 3436 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3437 ifa->idev->dev->ifindex);
3438
1da177e4 3439 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3440 preferred = ifa->prefered_lft;
3441 valid = ifa->valid_lft;
3442 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3443 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3444 if (preferred > tval)
3445 preferred -= tval;
3446 else
3447 preferred = 0;
85486af0
TG		 3448 if (valid != INFINITY_LIFE_TIME)
3449 valid -= tval;
1da177e4
LT		 3450 }
3451 } else {
85486af0
TG		 3452 preferred = INFINITY_LIFE_TIME;
3453 valid = INFINITY_LIFE_TIME;
3454 }
3455
0ab6803b 3456 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3457 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3458 nlmsg_cancel(skb, nlh);
3459 return -EMSGSIZE;
3460 }
1da177e4 3461
0ab6803b 3462 return nlmsg_end(skb, nlh);
1da177e4
LT		 3463}
3464
3465static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3466 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3467{
1da177e4 3468 struct nlmsghdr *nlh;
101bb229
TG		 3469 u8 scope = RT_SCOPE_UNIVERSE;
3470 int ifindex = ifmca->idev->dev->ifindex;
3471
3472 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3473 scope = RT_SCOPE_SITE;
1da177e4 3474
0ab6803b
TG		 3475 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3476 if (nlh == NULL)
26932566 3477 return -EMSGSIZE;
85486af0 3478
0ab6803b
TG		 3479 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3480 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3481 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3482 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3483 nlmsg_cancel(skb, nlh);
3484 return -EMSGSIZE;
3485 }
85486af0 3486
0ab6803b 3487 return nlmsg_end(skb, nlh);
1da177e4
LT		 3488}
3489
3490static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3491 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3492{
1da177e4 3493 struct nlmsghdr *nlh;
101bb229
TG		 3494 u8 scope = RT_SCOPE_UNIVERSE;
3495 int ifindex = ifaca->aca_idev->dev->ifindex;
3496
3497 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3498 scope = RT_SCOPE_SITE;
1da177e4 3499
0ab6803b
TG		 3500 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3501 if (nlh == NULL)
26932566 3502 return -EMSGSIZE;
85486af0 3503
0ab6803b
TG		 3504 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3505 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3506 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3507 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3508 nlmsg_cancel(skb, nlh);
3509 return -EMSGSIZE;
3510 }
1da177e4 3511
0ab6803b 3512 return nlmsg_end(skb, nlh);
1da177e4
LT		 3513}
3514
e21e8467 3515enum addr_type_t {
1da177e4
LT		 3516 UNICAST_ADDR,
3517 MULTICAST_ADDR,
3518 ANYCAST_ADDR,
3519};
3520
234b27c3
ED		 3521/* called with rcu_read_lock() */
3522static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3523 struct netlink_callback *cb, enum addr_type_t type,
3524 int s_ip_idx, int *p_ip_idx)
3525{
234b27c3
ED		 3526 struct ifmcaddr6 *ifmca;
3527 struct ifacaddr6 *ifaca;
3528 int err = 1;
3529 int ip_idx = *p_ip_idx;
3530
3531 read_lock_bh(&idev->lock);
3532 switch (type) {
502a2ffd 3533 case UNICAST_ADDR: {
3534 struct inet6_ifaddr *ifa;
3535
234b27c3 3536 /* unicast address incl. temp addr */
502a2ffd 3537 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3538 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3539 continue;
3540 err = inet6_fill_ifaddr(skb, ifa,
3541 NETLINK_CB(cb->skb).pid,
3542 cb->nlh->nlmsg_seq,
3543 RTM_NEWADDR,
3544 NLM_F_MULTI);
3545 if (err <= 0)
3546 break;
3547 }
3548 break;
502a2ffd 3549 }
234b27c3
ED		 3550 case MULTICAST_ADDR:
3551 /* multicast address */
3552 for (ifmca = idev->mc_list; ifmca;
3553 ifmca = ifmca->next, ip_idx++) {
3554 if (ip_idx < s_ip_idx)
3555 continue;
3556 err = inet6_fill_ifmcaddr(skb, ifmca,
3557 NETLINK_CB(cb->skb).pid,
3558 cb->nlh->nlmsg_seq,
3559 RTM_GETMULTICAST,
3560 NLM_F_MULTI);
3561 if (err <= 0)
3562 break;
3563 }
3564 break;
3565 case ANYCAST_ADDR:
3566 /* anycast address */
3567 for (ifaca = idev->ac_list; ifaca;
3568 ifaca = ifaca->aca_next, ip_idx++) {
3569 if (ip_idx < s_ip_idx)
3570 continue;
3571 err = inet6_fill_ifacaddr(skb, ifaca,
3572 NETLINK_CB(cb->skb).pid,
3573 cb->nlh->nlmsg_seq,
3574 RTM_GETANYCAST,
3575 NLM_F_MULTI);
3576 if (err <= 0)
3577 break;
3578 }
3579 break;
3580 default:
3581 break;
3582 }
3583 read_unlock_bh(&idev->lock);
3584 *p_ip_idx = ip_idx;
3585 return err;
3586}
3587
1da177e4
LT		 3588static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3589 enum addr_type_t type)
3590{
234b27c3
ED		 3591 struct net *net = sock_net(skb->sk);
3592 int h, s_h;
1da177e4
LT		 3593 int idx, ip_idx;
3594 int s_idx, s_ip_idx;
1da177e4 3595 struct net_device *dev;
234b27c3
ED		 3596 struct inet6_dev *idev;
3597 struct hlist_head *head;
3598 struct hlist_node *node;
1ab1457c 3599
234b27c3
ED		 3600 s_h = cb->args[0];
3601 s_idx = idx = cb->args[1];
3602 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3603
234b27c3
ED		 3604 rcu_read_lock();
3605 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3606 idx = 0;
3607 head = &net->dev_index_head[h];
3608 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3609 if (idx < s_idx)
3610 goto cont;
4b97efdf 3611 if (h > s_h || idx > s_idx)
234b27c3
ED		 3612 s_ip_idx = 0;
3613 ip_idx = 0;
e21e8467
SH		 3614 idev = __in6_dev_get(dev);
3615 if (!idev)
234b27c3
ED		 3616 goto cont;
3617
3618 if (in6_dump_addrs(idev, skb, cb, type,
3619 s_ip_idx, &ip_idx) <= 0)
3620 goto done;
7562f876 3621cont:
234b27c3
ED		 3622 idx++;
3623 }
1da177e4 3624 }
234b27c3
ED		 3625done:
3626 rcu_read_unlock();
3627 cb->args[0] = h;
3628 cb->args[1] = idx;
3629 cb->args[2] = ip_idx;
3630
1da177e4
LT		 3631 return skb->len;
3632}
3633
3634static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3635{
3636 enum addr_type_t type = UNICAST_ADDR;
b854272b 3637
1da177e4
LT		 3638 return inet6_dump_addr(skb, cb, type);
3639}
3640
3641static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3642{
3643 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3644
1da177e4
LT		 3645 return inet6_dump_addr(skb, cb, type);
3646}
3647
3648
3649static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3650{
3651 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3652
1da177e4
LT		 3653 return inet6_dump_addr(skb, cb, type);
3654}
3655
1b29fc2c
TG		 3656static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3657 void *arg)
6c223828 3658{
3b1e0a65 3659 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3660 struct ifaddrmsg *ifm;
3661 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3662 struct in6_addr *addr = NULL;
3663 struct net_device *dev = NULL;
3664 struct inet6_ifaddr *ifa;
3665 struct sk_buff *skb;
6c223828
NT		 3666 int err;
3667
1b29fc2c
TG		 3668 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3669 if (err < 0)
3670 goto errout;
3671
3672 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3673 if (addr == NULL) {
3674 err = -EINVAL;
3675 goto errout;
6c223828 3676 }
6c223828 3677
1b29fc2c 3678 ifm = nlmsg_data(nlh);
6c223828 3679 if (ifm->ifa_index)
6fda7350 3680 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3681
e21e8467
SH		 3682 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3683 if (!ifa) {
1b29fc2c
TG		 3684 err = -EADDRNOTAVAIL;
3685 goto errout;
3686 }
6c223828 3687
e21e8467
SH		 3688 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3689 if (!skb) {
6c223828 3690 err = -ENOBUFS;
1b29fc2c 3691 goto errout_ifa;
6c223828
NT		 3692 }
3693
6c223828
NT		 3694 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3695 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3696 if (err < 0) {
3697 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3698 WARN_ON(err == -EMSGSIZE);
3699 kfree_skb(skb);
3700 goto errout_ifa;
3701 }
6fda7350 3702 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3703errout_ifa:
6c223828 3704 in6_ifa_put(ifa);
1b29fc2c 3705errout:
6c223828 3706 return err;
6c223828
NT		 3707}
3708
1da177e4
LT		 3709static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3710{
3711 struct sk_buff *skb;
c346dca1 3712 struct net *net = dev_net(ifa->idev->dev);
5d620266 3713 int err = -ENOBUFS;
1da177e4 3714
0ab6803b 3715 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3716 if (skb == NULL)
3717 goto errout;
3718
3719 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3720 if (err < 0) {
3721 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3722 WARN_ON(err == -EMSGSIZE);
3723 kfree_skb(skb);
3724 goto errout;
3725 }
1ce85fe4
PNA		 3726 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3727 return;
5d620266
TG		 3728errout:
3729 if (err < 0)
6fda7350 3730 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3731}
3732
b6f99a21 3733static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3734 __s32 *array, int bytes)
3735{
04561c1f
TG		 3736 BUG_ON(bytes < (DEVCONF_MAX * 4));
3737
1da177e4
LT		 3738 memset(array, 0, bytes);
3739 array[DEVCONF_FORWARDING] = cnf->forwarding;
3740 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3741 array[DEVCONF_MTU6] = cnf->mtu6;
3742 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3743 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3744 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3745 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3746 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3747 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3748 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3749 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3750#ifdef CONFIG_IPV6_PRIVACY
3751 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3752 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3753 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3754 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3755 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3756#endif
3757 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3758 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3759 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3760#ifdef CONFIG_IPV6_ROUTER_PREF
3761 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3762 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3763#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3764 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3765#endif
930d6ff2 3766#endif
fbea49e1 3767 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3768 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3769#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3770 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3771#endif
7bc570c8
YH		 3772#ifdef CONFIG_IPV6_MROUTE
3773 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3774#endif
778d80be 3775 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3776 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3777 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3778}
3779
339bf98f
TG		 3780static inline size_t inet6_if_nlmsg_size(void)
3781{
3782 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3783 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3784 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3785 + nla_total_size(4) /* IFLA_MTU */
3786 + nla_total_size(4) /* IFLA_LINK */
3787 + nla_total_size( /* IFLA_PROTINFO */
3788 nla_total_size(4) /* IFLA_INET6_FLAGS */
3789 + nla_total_size(sizeof(struct ifla_cacheinfo))
3790 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3791 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3792 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3793 );
3794}
c5396a31 3795
7d720c3e
TH		 3796static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3797 int items, int bytes)
7f7d9a6b
HX		 3798{
3799 int i;
3800 int pad = bytes - sizeof(u64) * items;
3801 BUG_ON(pad < 0);
3802
3803 /* Use put_unaligned() because stats may not be aligned for u64. */
3804 put_unaligned(items, &stats[0]);
3805 for (i = 1; i < items; i++)
3806 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3807
3808 memset(&stats[items], 0, pad);
3809}
3810
3811static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3812 int bytes)
3813{
e21e8467 3814 switch (attrtype) {
7f7d9a6b 3815 case IFLA_INET6_STATS:
7d720c3e 3816 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3817 break;
3818 case IFLA_INET6_ICMP6STATS:
7d720c3e 3819 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3820 break;
3821 }
3822}
3823
1ab1457c 3824static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3825 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3826{
04561c1f 3827 struct net_device *dev = idev->dev;
bf99f1bd 3828 struct nlattr *nla;
04561c1f
TG		 3829 struct ifinfomsg *hdr;
3830 struct nlmsghdr *nlh;
3831 void *protoinfo;
3832 struct ifla_cacheinfo ci;
3833
3834 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3835 if (nlh == NULL)
26932566 3836 return -EMSGSIZE;
04561c1f
TG		 3837
3838 hdr = nlmsg_data(nlh);
3839 hdr->ifi_family = AF_INET6;
3840 hdr->__ifi_pad = 0;
3841 hdr->ifi_type = dev->type;
3842 hdr->ifi_index = dev->ifindex;
3843 hdr->ifi_flags = dev_get_flags(dev);
3844 hdr->ifi_change = 0;
3845
3846 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3847
3848 if (dev->addr_len)
04561c1f 3849 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3850
04561c1f 3851 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3852 if (dev->ifindex != dev->iflink)
04561c1f 3853 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3854
04561c1f
TG		 3855 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3856 if (protoinfo == NULL)
3857 goto nla_put_failure;
1da177e4 3858
04561c1f 3859 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3860
1da177e4
LT		 3861 ci.max_reasm_len = IPV6_MAXPLEN;
3862 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3863 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3864 ci.reachable_time = idev->nd_parms->reachable_time;
3865 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3866 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3867
bf99f1bd
YH		 3868 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3869 if (nla == NULL)
04561c1f 3870 goto nla_put_failure;
bf99f1bd 3871 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3872
bf99f1bd
YH		 3873 /* XXX - MC not implemented */
3874
3875 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3876 if (nla == NULL)
3877 goto nla_put_failure;
3878 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3879
3880 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3881 if (nla == NULL)
3882 goto nla_put_failure;
3883 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3884
04561c1f
TG		 3885 nla_nest_end(skb, protoinfo);
3886 return nlmsg_end(skb, nlh);
1da177e4 3887
04561c1f 3888nla_put_failure:
26932566
PM		 3889 nlmsg_cancel(skb, nlh);
3890 return -EMSGSIZE;
1da177e4
LT		 3891}
3892
3893static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3894{
3b1e0a65 3895 struct net *net = sock_net(skb->sk);
84d2697d 3896 int h, s_h;
434a8a58 3897 int idx = 0, s_idx;
1da177e4
LT		 3898 struct net_device *dev;
3899 struct inet6_dev *idev;
84d2697d
ED		 3900 struct hlist_head *head;
3901 struct hlist_node *node;
1da177e4 3902
84d2697d
ED		 3903 s_h = cb->args[0];
3904 s_idx = cb->args[1];
3905
3906 rcu_read_lock();
3907 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3908 idx = 0;
3909 head = &net->dev_index_head[h];
3910 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3911 if (idx < s_idx)
3912 goto cont;
3913 idev = __in6_dev_get(dev);
3914 if (!idev)
3915 goto cont;
3916 if (inet6_fill_ifinfo(skb, idev,
3917 NETLINK_CB(cb->skb).pid,
3918 cb->nlh->nlmsg_seq,
3919 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3920 goto out;
7562f876 3921cont:
84d2697d
ED		 3922 idx++;
3923 }
1da177e4 3924 }
84d2697d
ED		 3925out:
3926 rcu_read_unlock();
3927 cb->args[1] = idx;
3928 cb->args[0] = h;
1da177e4
LT		 3929
3930 return skb->len;
3931}
3932
3933void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3934{
3935 struct sk_buff *skb;
c346dca1 3936 struct net *net = dev_net(idev->dev);
8d7a76c9 3937 int err = -ENOBUFS;
1ab1457c 3938
339bf98f 3939 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3940 if (skb == NULL)
3941 goto errout;
3942
3943 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3944 if (err < 0) {
3945 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3946 WARN_ON(err == -EMSGSIZE);
3947 kfree_skb(skb);
3948 goto errout;
3949 }
1ce85fe4
PNA		 3950 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3951 return;
8d7a76c9
TG		 3952errout:
3953 if (err < 0)
6fda7350 3954 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3955}
3956
339bf98f
TG		 3957static inline size_t inet6_prefix_nlmsg_size(void)
3958{
3959 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3960 + nla_total_size(sizeof(struct in6_addr))
3961 + nla_total_size(sizeof(struct prefix_cacheinfo));
3962}
c5396a31 3963
1da177e4 3964static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3965 struct prefix_info *pinfo, u32 pid, u32 seq,
3966 int event, unsigned int flags)
1da177e4 3967{
6051e2f4
TG		 3968 struct prefixmsg *pmsg;
3969 struct nlmsghdr *nlh;
1da177e4
LT		 3970 struct prefix_cacheinfo ci;
3971
6051e2f4
TG		 3972 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3973 if (nlh == NULL)
26932566 3974 return -EMSGSIZE;
6051e2f4
TG		 3975
3976 pmsg = nlmsg_data(nlh);
1da177e4 3977 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3978 pmsg->prefix_pad1 = 0;
3979 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3980 pmsg->prefix_ifindex = idev->dev->ifindex;
3981 pmsg->prefix_len = pinfo->prefix_len;
3982 pmsg->prefix_type = pinfo->type;
8a47077a 3983 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3984 pmsg->prefix_flags = 0;
3985 if (pinfo->onlink)
3986 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3987 if (pinfo->autoconf)
3988 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3989
6051e2f4 3990 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3991
3992 ci.preferred_time = ntohl(pinfo->prefered);
3993 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3994 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3995
6051e2f4 3996 return nlmsg_end(skb, nlh);
1da177e4 3997
6051e2f4 3998nla_put_failure:
26932566
PM		 3999 nlmsg_cancel(skb, nlh);
4000 return -EMSGSIZE;
1da177e4
LT		 4001}
4002
1ab1457c 4003static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4004 struct prefix_info *pinfo)
4005{
4006 struct sk_buff *skb;
c346dca1 4007 struct net *net = dev_net(idev->dev);
8c384bfa 4008 int err = -ENOBUFS;
1da177e4 4009
339bf98f 4010 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4011 if (skb == NULL)
4012 goto errout;
4013
4014 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4015 if (err < 0) {
4016 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4017 WARN_ON(err == -EMSGSIZE);
4018 kfree_skb(skb);
4019 goto errout;
4020 }
1ce85fe4
PNA		 4021 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4022 return;
8c384bfa
TG		 4023errout:
4024 if (err < 0)
6fda7350 4025 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4026}
4027
1da177e4
LT		 4028static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4029{
4030 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4031
4032 switch (event) {
4033 case RTM_NEWADDR:
95c385b4
NH		 4034 /*
4035 * If the address was optimistic
4036 * we inserted the route at the start of
4037 * our DAD process, so we don't need
4038 * to do it again
4039 */
4040 if (!(ifp->rt->rt6i_node))
4041 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4042 if (ifp->idev->cnf.forwarding)
4043 addrconf_join_anycast(ifp);
4044 break;
4045 case RTM_DELADDR:
4046 if (ifp->idev->cnf.forwarding)
4047 addrconf_leave_anycast(ifp);
4048 addrconf_leave_solict(ifp->idev, &ifp->addr);
4049 dst_hold(&ifp->rt->u.dst);
93fa159a 4050
4051 if (ifp->dead && ip6_del_rt(ifp->rt))
1da177e4 4052 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4053 break;
4054 }
4055}
4056
4057static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4058{
8814c4b5 4059 rcu_read_lock_bh();
1da177e4
LT		 4060 if (likely(ifp->idev->dead == 0))
4061 __ipv6_ifa_notify(event, ifp);
8814c4b5 4062 rcu_read_unlock_bh();
1da177e4
LT		 4063}
4064
4065#ifdef CONFIG_SYSCTL
4066
4067static
8d65af78 4068int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4069 void __user *buffer, size_t *lenp, loff_t *ppos)
4070{
4071 int *valp = ctl->data;
4072 int val = *valp;
88af182e 4073 loff_t pos = *ppos;
1da177e4
LT		 4074 int ret;
4075
8d65af78 4076 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4077
c8fecf22 4078 if (write)
b325fddb 4079 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4080 if (ret)
4081 *ppos = pos;
1ab1457c 4082 return ret;
1da177e4
LT		 4083}
4084
56d417b1
BH		 4085static void dev_disable_change(struct inet6_dev *idev)
4086{
4087 if (!idev || !idev->dev)
4088 return;
4089
4090 if (idev->cnf.disable_ipv6)
4091 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4092 else
4093 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4094}
4095
4096static void addrconf_disable_change(struct net *net, __s32 newf)
4097{
4098 struct net_device *dev;
4099 struct inet6_dev *idev;
4100
c6d14c84
ED		 4101 rcu_read_lock();
4102 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4103 idev = __in6_dev_get(dev);
4104 if (idev) {
4105 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4106 idev->cnf.disable_ipv6 = newf;
4107 if (changed)
4108 dev_disable_change(idev);
4109 }
56d417b1 4110 }
c6d14c84 4111 rcu_read_unlock();
56d417b1
BH		 4112}
4113
4114static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4115{
4116 struct net *net;
4117
4118 net = (struct net *)table->extra2;
4119
4120 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4121 return 0;
4122
88af182e
EB		 4123 if (!rtnl_trylock()) {
4124 /* Restore the original values before restarting */
4125 *p = old;
56d417b1 4126 return restart_syscall();
88af182e 4127 }
56d417b1
BH		 4128
4129 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4130 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4131 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4132 addrconf_disable_change(net, newf);
4133 } else if ((!*p) ^ (!old))
4134 dev_disable_change((struct inet6_dev *)table->extra1);
4135
4136 rtnl_unlock();
4137 return 0;
4138}
4139
4140static
8d65af78 4141int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4142 void __user *buffer, size_t *lenp, loff_t *ppos)
4143{
4144 int *valp = ctl->data;
4145 int val = *valp;
88af182e 4146 loff_t pos = *ppos;
56d417b1
BH		 4147 int ret;
4148
8d65af78 4149 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4150
4151 if (write)
4152 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4153 if (ret)
4154 *ppos = pos;
56d417b1
BH		 4155 return ret;
4156}
4157
1da177e4
LT		 4158static struct addrconf_sysctl_table
4159{
4160 struct ctl_table_header *sysctl_header;
f6a07b29 4161 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4162 char *dev_name;
ab32ea5d 4163} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4164 .sysctl_header = NULL,
4165 .addrconf_vars = {
1ab1457c 4166 {
e21e8467
SH		 4167 .procname = "forwarding",
4168 .data = &ipv6_devconf.forwarding,
4169 .maxlen = sizeof(int),
4170 .mode = 0644,
4171 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4172 },
4173 {
e21e8467
SH		 4174 .procname = "hop_limit",
4175 .data = &ipv6_devconf.hop_limit,
4176 .maxlen = sizeof(int),
4177 .mode = 0644,
4178 .proc_handler = proc_dointvec,
1da177e4
LT		 4179 },
4180 {
e21e8467
SH		 4181 .procname = "mtu",
4182 .data = &ipv6_devconf.mtu6,
4183 .maxlen = sizeof(int),
4184 .mode = 0644,
4185 .proc_handler = proc_dointvec,
1da177e4
LT		 4186 },
4187 {
e21e8467
SH		 4188 .procname = "accept_ra",
4189 .data = &ipv6_devconf.accept_ra,
4190 .maxlen = sizeof(int),
4191 .mode = 0644,
4192 .proc_handler = proc_dointvec,
1da177e4
LT		 4193 },
4194 {
e21e8467
SH		 4195 .procname = "accept_redirects",
4196 .data = &ipv6_devconf.accept_redirects,
4197 .maxlen = sizeof(int),
4198 .mode = 0644,
4199 .proc_handler = proc_dointvec,
1da177e4
LT		 4200 },
4201 {
e21e8467
SH		 4202 .procname = "autoconf",
4203 .data = &ipv6_devconf.autoconf,
4204 .maxlen = sizeof(int),
4205 .mode = 0644,
4206 .proc_handler = proc_dointvec,
1da177e4
LT		 4207 },
4208 {
e21e8467
SH		 4209 .procname = "dad_transmits",
4210 .data = &ipv6_devconf.dad_transmits,
4211 .maxlen = sizeof(int),
4212 .mode = 0644,
4213 .proc_handler = proc_dointvec,
1da177e4
LT		 4214 },
4215 {
e21e8467
SH		 4216 .procname = "router_solicitations",
4217 .data = &ipv6_devconf.rtr_solicits,
4218 .maxlen = sizeof(int),
4219 .mode = 0644,
4220 .proc_handler = proc_dointvec,
1da177e4
LT		 4221 },
4222 {
e21e8467
SH		 4223 .procname = "router_solicitation_interval",
4224 .data = &ipv6_devconf.rtr_solicit_interval,
4225 .maxlen = sizeof(int),
4226 .mode = 0644,
4227 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4228 },
4229 {
e21e8467
SH		 4230 .procname = "router_solicitation_delay",
4231 .data = &ipv6_devconf.rtr_solicit_delay,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
4234 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4235 },
4236 {
e21e8467
SH		 4237 .procname = "force_mld_version",
4238 .data = &ipv6_devconf.force_mld_version,
4239 .maxlen = sizeof(int),
4240 .mode = 0644,
4241 .proc_handler = proc_dointvec,
1da177e4
LT		 4242 },
4243#ifdef CONFIG_IPV6_PRIVACY
4244 {
e21e8467
SH		 4245 .procname = "use_tempaddr",
4246 .data = &ipv6_devconf.use_tempaddr,
4247 .maxlen = sizeof(int),
4248 .mode = 0644,
4249 .proc_handler = proc_dointvec,
1da177e4
LT		 4250 },
4251 {
e21e8467
SH		 4252 .procname = "temp_valid_lft",
4253 .data = &ipv6_devconf.temp_valid_lft,
4254 .maxlen = sizeof(int),
4255 .mode = 0644,
4256 .proc_handler = proc_dointvec,
1da177e4
LT		 4257 },
4258 {
e21e8467
SH		 4259 .procname = "temp_prefered_lft",
4260 .data = &ipv6_devconf.temp_prefered_lft,
4261 .maxlen = sizeof(int),
4262 .mode = 0644,
4263 .proc_handler = proc_dointvec,
1da177e4
LT		 4264 },
4265 {
e21e8467
SH		 4266 .procname = "regen_max_retry",
4267 .data = &ipv6_devconf.regen_max_retry,
4268 .maxlen = sizeof(int),
4269 .mode = 0644,
4270 .proc_handler = proc_dointvec,
1da177e4
LT		 4271 },
4272 {
e21e8467
SH		 4273 .procname = "max_desync_factor",
4274 .data = &ipv6_devconf.max_desync_factor,
4275 .maxlen = sizeof(int),
4276 .mode = 0644,
4277 .proc_handler = proc_dointvec,
1da177e4
LT		 4278 },
4279#endif
4280 {
e21e8467
SH		 4281 .procname = "max_addresses",
4282 .data = &ipv6_devconf.max_addresses,
4283 .maxlen = sizeof(int),
4284 .mode = 0644,
4285 .proc_handler = proc_dointvec,
1da177e4 4286 },
65f5c7c1 4287 {
e21e8467
SH		 4288 .procname = "accept_ra_defrtr",
4289 .data = &ipv6_devconf.accept_ra_defrtr,
4290 .maxlen = sizeof(int),
4291 .mode = 0644,
4292 .proc_handler = proc_dointvec,
65f5c7c1 4293 },
c4fd30eb 4294 {
e21e8467
SH		 4295 .procname = "accept_ra_pinfo",
4296 .data = &ipv6_devconf.accept_ra_pinfo,
4297 .maxlen = sizeof(int),
4298 .mode = 0644,
4299 .proc_handler = proc_dointvec,
c4fd30eb 4300 },
930d6ff2
YH		 4301#ifdef CONFIG_IPV6_ROUTER_PREF
4302 {
e21e8467
SH		 4303 .procname = "accept_ra_rtr_pref",
4304 .data = &ipv6_devconf.accept_ra_rtr_pref,
4305 .maxlen = sizeof(int),
4306 .mode = 0644,
4307 .proc_handler = proc_dointvec,
930d6ff2 4308 },
52e16356 4309 {
e21e8467
SH		 4310 .procname = "router_probe_interval",
4311 .data = &ipv6_devconf.rtr_probe_interval,
4312 .maxlen = sizeof(int),
4313 .mode = 0644,
4314 .proc_handler = proc_dointvec_jiffies,
52e16356 4315 },
fa03ef38 4316#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4317 {
e21e8467
SH		 4318 .procname = "accept_ra_rt_info_max_plen",
4319 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
09c884d4
YH		 4323 },
4324#endif
930d6ff2 4325#endif
fbea49e1 4326 {
e21e8467
SH		 4327 .procname = "proxy_ndp",
4328 .data = &ipv6_devconf.proxy_ndp,
4329 .maxlen = sizeof(int),
4330 .mode = 0644,
4331 .proc_handler = proc_dointvec,
fbea49e1 4332 },
0bcbc926 4333 {
e21e8467
SH		 4334 .procname = "accept_source_route",
4335 .data = &ipv6_devconf.accept_source_route,
4336 .maxlen = sizeof(int),
4337 .mode = 0644,
4338 .proc_handler = proc_dointvec,
0bcbc926 4339 },
95c385b4
NH		 4340#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4341 {
e21e8467
SH		 4342 .procname = "optimistic_dad",
4343 .data = &ipv6_devconf.optimistic_dad,
4344 .maxlen = sizeof(int),
4345 .mode = 0644,
4346 .proc_handler = proc_dointvec,
95c385b4
NH		 4347
4348 },
7bc570c8
YH		 4349#endif
4350#ifdef CONFIG_IPV6_MROUTE
4351 {
e21e8467
SH		 4352 .procname = "mc_forwarding",
4353 .data = &ipv6_devconf.mc_forwarding,
4354 .maxlen = sizeof(int),
4355 .mode = 0444,
4356 .proc_handler = proc_dointvec,
7bc570c8 4357 },
95c385b4 4358#endif
778d80be 4359 {
e21e8467
SH		 4360 .procname = "disable_ipv6",
4361 .data = &ipv6_devconf.disable_ipv6,
4362 .maxlen = sizeof(int),
4363 .mode = 0644,
4364 .proc_handler = addrconf_sysctl_disable,
778d80be 4365 },
1b34be74 4366 {
e21e8467
SH		 4367 .procname = "accept_dad",
4368 .data = &ipv6_devconf.accept_dad,
4369 .maxlen = sizeof(int),
4370 .mode = 0644,
4371 .proc_handler = proc_dointvec,
1b34be74 4372 },
f7734fdf 4373 {
f7734fdf
OP		 4374 .procname = "force_tllao",
4375 .data = &ipv6_devconf.force_tllao,
4376 .maxlen = sizeof(int),
4377 .mode = 0644,
4378 .proc_handler = proc_dointvec
4379 },
1da177e4 4380 {
f8572d8f 4381 /* sentinel */
1da177e4
LT		 4382 }
4383 },
1da177e4
LT		 4384};
4385
bff16c2f 4386static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4387 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4388{
4389 int i;
1da177e4 4390 struct addrconf_sysctl_table *t;
1da177e4 4391
1dab6222
PE		 4392#define ADDRCONF_CTL_PATH_DEV 3
4393
4394 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4395 { .procname = "net", },
4396 { .procname = "ipv6", },
4397 { .procname = "conf", },
1dab6222
PE		 4398 { /* to be set */ },
4399 { },
4400 };
4401
4402
af879cc7 4403 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4404 if (t == NULL)
f68635e6
PE		 4405 goto out;
4406
bcdd553f 4407 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4408 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4409 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4410 t->addrconf_vars[i].extra2 = net;
1da177e4 4411 }
1da177e4 4412
1ab1457c
YH		 4413 /*
4414 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4415 * by sysctl and we wouldn't want anyone to change it under our feet
4416 * (see SIOCSIFNAME).
1ab1457c 4417 */
1dab6222
PE		 4418 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4419 if (!t->dev_name)
f68635e6 4420 goto free;
1da177e4 4421
1dab6222 4422 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4423
bff16c2f 4424 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4425 t->addrconf_vars);
1da177e4
LT		 4426 if (t->sysctl_header == NULL)
4427 goto free_procname;
f68635e6
PE		 4428
4429 p->sysctl = t;
95897312 4430 return 0;
1da177e4 4431
f68635e6 4432free_procname:
1dab6222 4433 kfree(t->dev_name);
f68635e6 4434free:
1da177e4 4435 kfree(t);
f68635e6 4436out:
95897312 4437 return -ENOBUFS;
1da177e4
LT		 4438}
4439
408c4768
PE		 4440static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4441{
4442 struct addrconf_sysctl_table *t;
4443
4444 if (p->sysctl == NULL)
4445 return;
4446
4447 t = p->sysctl;
4448 p->sysctl = NULL;
4449 unregister_sysctl_table(t->sysctl_header);
4450 kfree(t->dev_name);
4451 kfree(t);
4452}
4453
f52295a9
PE		 4454static void addrconf_sysctl_register(struct inet6_dev *idev)
4455{
54716e3b 4456 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4457 &ndisc_ifinfo_sysctl_change);
c346dca1 4458 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4459 idev, &idev->cnf);
f52295a9
PE		 4460}
4461
408c4768 4462static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4463{
408c4768
PE		 4464 __addrconf_sysctl_unregister(&idev->cnf);
4465 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4466}
4467
4468
4469#endif
4470
2c8c1e72 4471static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4472{
4473 int err;
4474 struct ipv6_devconf *all, *dflt;
4475
4476 err = -ENOMEM;
4477 all = &ipv6_devconf;
4478 dflt = &ipv6_devconf_dflt;
4479
09ad9bc7 4480 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4481 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4482 if (all == NULL)
4483 goto err_alloc_all;
4484
4485 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4486 if (dflt == NULL)
4487 goto err_alloc_dflt;
56d417b1
BH		 4488 } else {
4489 /* these will be inherited by all namespaces */
4490 dflt->autoconf = ipv6_defaults.autoconf;
4491 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4492 }
4493
4494 net->ipv6.devconf_all = all;
4495 net->ipv6.devconf_dflt = dflt;
4496
4497#ifdef CONFIG_SYSCTL
f8572d8f 4498 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4499 if (err < 0)
4500 goto err_reg_all;
4501
f8572d8f 4502 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4503 if (err < 0)
4504 goto err_reg_dflt;
4505#endif
4506 return 0;
4507
4508#ifdef CONFIG_SYSCTL
4509err_reg_dflt:
4510 __addrconf_sysctl_unregister(all);
4511err_reg_all:
4512 kfree(dflt);
4513#endif
4514err_alloc_dflt:
4515 kfree(all);
4516err_alloc_all:
4517 return err;
4518}
4519
2c8c1e72 4520static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4521{
4522#ifdef CONFIG_SYSCTL
4523 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4524 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4525#endif
09ad9bc7 4526 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4527 kfree(net->ipv6.devconf_dflt);
4528 kfree(net->ipv6.devconf_all);
4529 }
4530}
4531
4532static struct pernet_operations addrconf_ops = {
4533 .init = addrconf_init_net,
4534 .exit = addrconf_exit_net,
4535};
4536
1da177e4
LT		 4537/*
4538 * Device notifier
4539 */
4540
4541int register_inet6addr_notifier(struct notifier_block *nb)
4542{
1ab1457c 4543 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4544}
7159039a
YH		 4545EXPORT_SYMBOL(register_inet6addr_notifier);
4546
1da177e4
LT		 4547int unregister_inet6addr_notifier(struct notifier_block *nb)
4548{
e21e8467 4549 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4550}
7159039a
YH		 4551EXPORT_SYMBOL(unregister_inet6addr_notifier);
4552
1da177e4
LT		 4553/*
4554 * Init / cleanup code
4555 */
4556
4557int __init addrconf_init(void)
4558{
c2e21293 4559 int i, err;
2a8cc6c8 4560
e21e8467
SH		 4561 err = ipv6_addr_label_init();
4562 if (err < 0) {
4563 printk(KERN_CRIT "IPv6 Addrconf:"
4564 " cannot initialize default policy table: %d.\n", err);
2a8cc6c8
YH		 4565 return err;
4566 }
1da177e4 4567
e0da5a48
PE		 4568 register_pernet_subsys(&addrconf_ops);
4569
1da177e4
LT		 4570 /* The addrconf netdev notifier requires that loopback_dev
4571 * has it's ipv6 private information allocated and setup
4572 * before it can bring up and give link-local addresses
4573 * to other devices which are up.
4574 *
4575 * Unfortunately, loopback_dev is not necessarily the first
4576 * entry in the global dev_base list of net devices. In fact,
4577 * it is likely to be the very last entry on that list.
4578 * So this causes the notifier registry below to try and
4579 * give link-local addresses to all devices besides loopback_dev
4580 * first, then loopback_dev, which cases all the non-loopback_dev
4581 * devices to fail to get a link-local address.
4582 *
4583 * So, as a temporary fix, allocate the ipv6 structure for
4584 * loopback_dev first by hand.
4585 * Longer term, all of the dependencies ipv6 has upon the loopback
4586 * device and it being up should be removed.
4587 */
4588 rtnl_lock();
2774c7ab 4589 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4590 err = -ENOMEM;
4591 rtnl_unlock();
4592 if (err)
e0da5a48 4593 goto errlo;
1da177e4 4594
c2e21293 4595 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4596 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4597
1da177e4
LT		 4598 register_netdevice_notifier(&ipv6_dev_notf);
4599
1da177e4 4600 addrconf_verify(0);
c127ea2c
TG		 4601
4602 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4603 if (err < 0)
4604 goto errout;
4605
4606 /* Only the first call to __rtnl_register can fail */
4607 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4608 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4609 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4610 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4611 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4612
2a8cc6c8
YH		 4613 ipv6_addr_label_rtnl_register();
4614
1da177e4 4615 return 0;
c127ea2c
TG		 4616errout:
4617 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4618errlo:
4619 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4620
4621 return err;
1da177e4
LT		 4622}
4623
09f7709f 4624void addrconf_cleanup(void)
1da177e4 4625{
176c39af 4626 struct net_device *dev;
1da177e4
LT		 4627 int i;
4628
4629 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4630 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4631
4632 rtnl_lock();
4633
176c39af
DL		 4634 /* clean dev list */
4635 for_each_netdev(&init_net, dev) {
4636 if (__in6_dev_get(dev) == NULL)
4637 continue;
4638 addrconf_ifdown(dev, 1);
4639 }
4640 addrconf_ifdown(init_net.loopback_dev, 2);
4641
1da177e4
LT		 4642 /*
4643 * Check hash table.
4644 */
5c578aed 4645 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4646 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4647 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4648 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4649
4650 del_timer(&addr_chk_timer);
1da177e4 4651 rtnl_unlock();
1da177e4 4652}
Clone of davem's net-next-2.6 tree