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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/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
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
1b34be74 124static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 125static int ipv6_count_addresses(struct inet6_dev *idev);
126
127/*
128 * Configured unicast address hash table
129 */
130static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
131static DEFINE_RWLOCK(addrconf_hash_lock);
132
1da177e4
LT		 133static void addrconf_verify(unsigned long);
134
8d06afab 135static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 136static DEFINE_SPINLOCK(addrconf_verify_lock);
137
138static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
139static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
140
75c78500
MS		 141static void addrconf_bonding_change(struct net_device *dev,
142 unsigned long event);
1da177e4
LT		 143static int addrconf_ifdown(struct net_device *dev, int how);
144
e431b8c0 145static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 146static void addrconf_dad_timer(unsigned long data);
147static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 148static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 149static void addrconf_rs_timer(unsigned long data);
150static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
152
1ab1457c 153static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 154 struct prefix_info *pinfo);
06bfe655
DL		 155static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
156 struct net_device *dev);
1da177e4 157
e041c683 158static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 159
888c848e 160static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 161 .forwarding = 0,
162 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
163 .mtu6 = IPV6_MIN_MTU,
164 .accept_ra = 1,
165 .accept_redirects = 1,
166 .autoconf = 1,
167 .force_mld_version = 0,
168 .dad_transmits = 1,
169 .rtr_solicits = MAX_RTR_SOLICITATIONS,
170 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
171 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
172#ifdef CONFIG_IPV6_PRIVACY
173 .use_tempaddr = 0,
174 .temp_valid_lft = TEMP_VALID_LIFETIME,
175 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
176 .regen_max_retry = REGEN_MAX_RETRY,
177 .max_desync_factor = MAX_DESYNC_FACTOR,
178#endif
179 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 180 .accept_ra_defrtr = 1,
c4fd30eb 181 .accept_ra_pinfo = 1,
930d6ff2
YH		 182#ifdef CONFIG_IPV6_ROUTER_PREF
183 .accept_ra_rtr_pref = 1,
52e16356 184 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 185#ifdef CONFIG_IPV6_ROUTE_INFO
186 .accept_ra_rt_info_max_plen = 0,
187#endif
930d6ff2 188#endif
fbea49e1 189 .proxy_ndp = 0,
0bcbc926 190 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 191 .disable_ipv6 = 0,
1b34be74 192 .accept_dad = 1,
1da177e4
LT		 193};
194
ab32ea5d 195static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 196 .forwarding = 0,
197 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
198 .mtu6 = IPV6_MIN_MTU,
199 .accept_ra = 1,
200 .accept_redirects = 1,
201 .autoconf = 1,
202 .dad_transmits = 1,
203 .rtr_solicits = MAX_RTR_SOLICITATIONS,
204 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
205 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
206#ifdef CONFIG_IPV6_PRIVACY
207 .use_tempaddr = 0,
208 .temp_valid_lft = TEMP_VALID_LIFETIME,
209 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
210 .regen_max_retry = REGEN_MAX_RETRY,
211 .max_desync_factor = MAX_DESYNC_FACTOR,
212#endif
213 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 214 .accept_ra_defrtr = 1,
c4fd30eb 215 .accept_ra_pinfo = 1,
930d6ff2
YH		 216#ifdef CONFIG_IPV6_ROUTER_PREF
217 .accept_ra_rtr_pref = 1,
52e16356 218 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 219#ifdef CONFIG_IPV6_ROUTE_INFO
220 .accept_ra_rt_info_max_plen = 0,
221#endif
930d6ff2 222#endif
fbea49e1 223 .proxy_ndp = 0,
0bcbc926 224 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 225 .disable_ipv6 = 0,
1b34be74 226 .accept_dad = 1,
1da177e4
LT		 227};
228
229/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 230const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 231const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 232const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
233const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 234
f24e3d65 235/* Check if a valid qdisc is available */
05297949 236static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 237{
05297949 238 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 239}
240
2b5ead46
YH		 241/* Check if a route is valid prefix route */
242static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
243{
244 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
245}
246
1da177e4
LT		 247static void addrconf_del_timer(struct inet6_ifaddr *ifp)
248{
249 if (del_timer(&ifp->timer))
250 __in6_ifa_put(ifp);
251}
252
253enum addrconf_timer_t
254{
255 AC_NONE,
256 AC_DAD,
257 AC_RS,
258};
259
260static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
261 enum addrconf_timer_t what,
262 unsigned long when)
263{
264 if (!del_timer(&ifp->timer))
265 in6_ifa_hold(ifp);
266
267 switch (what) {
268 case AC_DAD:
269 ifp->timer.function = addrconf_dad_timer;
270 break;
271 case AC_RS:
272 ifp->timer.function = addrconf_rs_timer;
273 break;
274 default:;
275 }
276 ifp->timer.expires = jiffies + when;
277 add_timer(&ifp->timer);
278}
279
7f7d9a6b
HX		 280static int snmp6_alloc_dev(struct inet6_dev *idev)
281{
7d720c3e 282 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 283 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 284 goto err_ip;
7d720c3e 285 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 286 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 287 goto err_icmp;
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 289 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 290 goto err_icmpmsg;
7f7d9a6b
HX		 291
292 return 0;
293
14878f75 294err_icmpmsg:
7d720c3e 295 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 296err_icmp:
7d720c3e 297 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 298err_ip:
aaf70ec7 299 return -ENOMEM;
7f7d9a6b
HX		 300}
301
16910b98 302static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 303{
7d720c3e
TH		 304 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
305 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 307}
308
1da177e4
LT		 309/* Nobody refers to this device, we may destroy it. */
310
8814c4b5
YH		 311static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
312{
313 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
314 kfree(idev);
315}
316
1da177e4
LT		 317void in6_dev_finish_destroy(struct inet6_dev *idev)
318{
319 struct net_device *dev = idev->dev;
547b792c
IJ		 320
321 WARN_ON(idev->addr_list != NULL);
322 WARN_ON(idev->mc_list != NULL);
323
1da177e4
LT		 324#ifdef NET_REFCNT_DEBUG
325 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
326#endif
327 dev_put(dev);
328 if (!idev->dead) {
329 printk("Freeing alive inet6 device %p\n", idev);
330 return;
331 }
332 snmp6_free_dev(idev);
8814c4b5 333 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 334}
335
7159039a
YH		 336EXPORT_SYMBOL(in6_dev_finish_destroy);
337
1da177e4
LT		 338static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
339{
340 struct inet6_dev *ndev;
341
342 ASSERT_RTNL();
343
344 if (dev->mtu < IPV6_MIN_MTU)
345 return NULL;
346
1ab1457c 347 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 348
1ab1457c
YH		 349 if (ndev == NULL)
350 return NULL;
322f74a4
IO		 351
352 rwlock_init(&ndev->lock);
353 ndev->dev = dev;
c346dca1 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 355 ndev->cnf.mtu6 = dev->mtu;
356 ndev->cnf.sysctl = NULL;
357 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
358 if (ndev->nd_parms == NULL) {
359 kfree(ndev);
360 return NULL;
361 }
0187bdfb
BH		 362 if (ndev->cnf.forwarding)
363 dev_disable_lro(dev);
322f74a4
IO		 364 /* We refer to the device */
365 dev_hold(dev);
1da177e4 366
322f74a4
IO		 367 if (snmp6_alloc_dev(ndev) < 0) {
368 ADBG((KERN_WARNING
369 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 370 __func__, dev->name));
322f74a4
IO		 371 neigh_parms_release(&nd_tbl, ndev->nd_parms);
372 ndev->dead = 1;
373 in6_dev_finish_destroy(ndev);
374 return NULL;
375 }
1da177e4 376
322f74a4
IO		 377 if (snmp6_register_dev(ndev) < 0) {
378 ADBG((KERN_WARNING
379 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 380 __func__, dev->name));
322f74a4
IO		 381 neigh_parms_release(&nd_tbl, ndev->nd_parms);
382 ndev->dead = 1;
383 in6_dev_finish_destroy(ndev);
384 return NULL;
385 }
386
387 /* One reference from device. We must do this before
388 * we invoke __ipv6_regen_rndid().
389 */
390 in6_dev_hold(ndev);
1da177e4 391
1b34be74
YH		 392 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
393 ndev->cnf.accept_dad = -1;
394
b077d7ab
YH		 395#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
396 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
397 printk(KERN_INFO
398 "%s: Disabled Multicast RS\n",
399 dev->name);
400 ndev->cnf.rtr_solicits = 0;
401 }
402#endif
403
1da177e4 404#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 406 if ((dev->flags&IFF_LOOPBACK) ||
407 dev->type == ARPHRD_TUNNEL ||
9625ed72 408 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 409 dev->type == ARPHRD_SIT ||
0be669bb 410 dev->type == ARPHRD_NONE) {
322f74a4
IO		 411 printk(KERN_INFO
412 "%s: Disabled Privacy Extensions\n",
413 dev->name);
414 ndev->cnf.use_tempaddr = -1;
415 } else {
416 in6_dev_hold(ndev);
417 ipv6_regen_rndid((unsigned long) ndev);
418 }
1da177e4
LT		 419#endif
420
f24e3d65 421 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 422 ndev->if_flags |= IF_READY;
423
322f74a4
IO		 424 ipv6_mc_init_dev(ndev);
425 ndev->tstamp = jiffies;
f52295a9 426 addrconf_sysctl_register(ndev);
30c4cf57
DS		 427 /* protected by rtnl_lock */
428 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 429
430 /* Join all-node multicast group */
f3ee4010 431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 432
1da177e4
LT		 433 return ndev;
434}
435
cee89473 436static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 437{
438 struct inet6_dev *idev;
439
440 ASSERT_RTNL();
441
442 if ((idev = __in6_dev_get(dev)) == NULL) {
443 if ((idev = ipv6_add_dev(dev)) == NULL)
444 return NULL;
445 }
c5e33bdd 446
1da177e4
LT		 447 if (dev->flags&IFF_UP)
448 ipv6_mc_up(idev);
449 return idev;
450}
451
452#ifdef CONFIG_SYSCTL
453static void dev_forward_change(struct inet6_dev *idev)
454{
455 struct net_device *dev;
456 struct inet6_ifaddr *ifa;
1da177e4
LT		 457
458 if (!idev)
459 return;
460 dev = idev->dev;
0187bdfb
BH		 461 if (idev->cnf.forwarding)
462 dev_disable_lro(dev);
1da177e4 463 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 464 if (idev->cnf.forwarding)
f3ee4010 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 466 else
f3ee4010 467 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4
LT		 468 }
469 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 470 if (ifa->flags&IFA_F_TENTATIVE)
471 continue;
1da177e4
LT		 472 if (idev->cnf.forwarding)
473 addrconf_join_anycast(ifa);
474 else
475 addrconf_leave_anycast(ifa);
476 }
477}
478
479
e186932b 480static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 481{
482 struct net_device *dev;
483 struct inet6_dev *idev;
484
c6d14c84
ED		 485 rcu_read_lock();
486 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 487 idev = __in6_dev_get(dev);
488 if (idev) {
e186932b
PE		 489 int changed = (!idev->cnf.forwarding) ^ (!newf);
490 idev->cnf.forwarding = newf;
1da177e4
LT		 491 if (changed)
492 dev_forward_change(idev);
493 }
1da177e4 494 }
c6d14c84 495 rcu_read_unlock();
1da177e4 496}
c8fecf22 497
b325fddb 498static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 499{
bff16c2f
PE		 500 struct net *net;
501
502 net = (struct net *)table->extra2;
441fc2a2 503 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 504 return 0;
505
88af182e
EB		 506 if (!rtnl_trylock()) {
507 /* Restore the original values before restarting */
508 *p = old;
5007392d 509 return restart_syscall();
88af182e 510 }
c8fecf22 511
e186932b
PE		 512 if (p == &net->ipv6.devconf_all->forwarding) {
513 __s32 newf = net->ipv6.devconf_all->forwarding;
514 net->ipv6.devconf_dflt->forwarding = newf;
515 addrconf_forward_change(net, newf);
c8fecf22
PE		 516 } else if ((!*p) ^ (!old))
517 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 518 rtnl_unlock();
c8fecf22
PE		 519
520 if (*p)
7b4da532 521 rt6_purge_dflt_routers(net);
b325fddb 522 return 1;
c8fecf22 523}
1da177e4
LT		 524#endif
525
526/* Nobody refers to this ifaddr, destroy it */
527
528void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
529{
547b792c
IJ		 530 WARN_ON(ifp->if_next != NULL);
531 WARN_ON(ifp->lst_next != NULL);
532
1da177e4
LT		 533#ifdef NET_REFCNT_DEBUG
534 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
535#endif
536
537 in6_dev_put(ifp->idev);
538
539 if (del_timer(&ifp->timer))
540 printk("Timer is still running, when freeing ifa=%p\n", ifp);
541
542 if (!ifp->dead) {
543 printk("Freeing alive inet6 address %p\n", ifp);
544 return;
545 }
546 dst_release(&ifp->rt->u.dst);
547
548 kfree(ifp);
549}
550
e55ffac6
BH		 551static void
552ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
553{
554 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 555 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 556
557 /*
558 * Each device address list is sorted in order of scope -
559 * global before linklocal.
560 */
561 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
562 ifap = &ifa->if_next) {
8a6ce0c0 563 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 564 break;
565 }
566
567 ifp->if_next = *ifap;
568 *ifap = ifp;
569}
570
3eb84f49
YH		 571/*
572 * Hash function taken from net_alias.c
573 */
574static u8 ipv6_addr_hash(const struct in6_addr *addr)
575{
576 __u32 word;
577
578 /*
579 * We perform the hash function over the last 64 bits of the address
580 * This will include the IEEE address token on links that support it.
581 */
582
583 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
584 word ^= (word >> 16);
585 word ^= (word >> 8);
586
587 return ((word ^ (word >> 4)) & 0x0f);
588}
589
1da177e4
LT		 590/* On success it returns ifp with increased reference count */
591
592static struct inet6_ifaddr *
593ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 594 int scope, u32 flags)
1da177e4
LT		 595{
596 struct inet6_ifaddr *ifa = NULL;
597 struct rt6_info *rt;
598 int hash;
599 int err = 0;
d68b8270
YH		 600 int addr_type = ipv6_addr_type(addr);
601
602 if (addr_type == IPV6_ADDR_ANY ||
603 addr_type & IPV6_ADDR_MULTICAST ||
604 (!(idev->dev->flags & IFF_LOOPBACK) &&
605 addr_type & IPV6_ADDR_LOOPBACK))
606 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 607
8814c4b5 608 rcu_read_lock_bh();
1da177e4
LT		 609 if (idev->dead) {
610 err = -ENODEV; /*XXX*/
611 goto out2;
612 }
613
56d417b1 614 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 615 err = -EACCES;
616 goto out2;
617 }
618
1da177e4
LT		 619 write_lock(&addrconf_hash_lock);
620
621 /* Ignore adding duplicate addresses on an interface */
c346dca1 622 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 623 ADBG(("ipv6_add_addr: already assigned\n"));
624 err = -EEXIST;
625 goto out;
626 }
627
322f74a4 628 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 629
630 if (ifa == NULL) {
631 ADBG(("ipv6_add_addr: malloc failed\n"));
632 err = -ENOBUFS;
633 goto out;
634 }
635
636 rt = addrconf_dst_alloc(idev, addr, 0);
637 if (IS_ERR(rt)) {
638 err = PTR_ERR(rt);
639 goto out;
640 }
641
1da177e4
LT		 642 ipv6_addr_copy(&ifa->addr, addr);
643
644 spin_lock_init(&ifa->lock);
645 init_timer(&ifa->timer);
646 ifa->timer.data = (unsigned long) ifa;
647 ifa->scope = scope;
648 ifa->prefix_len = pfxlen;
649 ifa->flags = flags | IFA_F_TENTATIVE;
650 ifa->cstamp = ifa->tstamp = jiffies;
651
57f5f544
KF		 652 ifa->rt = rt;
653
95c385b4
NH		 654 /*
655 * part one of RFC 4429, section 3.3
656 * We should not configure an address as
657 * optimistic if we do not yet know the link
658 * layer address of our nexhop router
659 */
660
661 if (rt->rt6i_nexthop == NULL)
662 ifa->flags &= ~IFA_F_OPTIMISTIC;
663
1da177e4
LT		 664 ifa->idev = idev;
665 in6_dev_hold(idev);
666 /* For caller */
667 in6_ifa_hold(ifa);
668
669 /* Add to big hash table */
670 hash = ipv6_addr_hash(addr);
671
672 ifa->lst_next = inet6_addr_lst[hash];
673 inet6_addr_lst[hash] = ifa;
674 in6_ifa_hold(ifa);
675 write_unlock(&addrconf_hash_lock);
676
677 write_lock(&idev->lock);
678 /* Add to inet6_dev unicast addr list. */
e55ffac6 679 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 680
681#ifdef CONFIG_IPV6_PRIVACY
682 if (ifa->flags&IFA_F_TEMPORARY) {
683 ifa->tmp_next = idev->tempaddr_list;
684 idev->tempaddr_list = ifa;
685 in6_ifa_hold(ifa);
686 }
687#endif
688
1da177e4
LT		 689 in6_ifa_hold(ifa);
690 write_unlock(&idev->lock);
691out2:
8814c4b5 692 rcu_read_unlock_bh();
1da177e4 693
fd92833a 694 if (likely(err == 0))
e041c683 695 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 696 else {
697 kfree(ifa);
698 ifa = ERR_PTR(err);
699 }
700
701 return ifa;
702out:
703 write_unlock(&addrconf_hash_lock);
704 goto out2;
705}
706
707/* This function wants to get referenced ifp and releases it before return */
708
709static void ipv6_del_addr(struct inet6_ifaddr *ifp)
710{
711 struct inet6_ifaddr *ifa, **ifap;
712 struct inet6_dev *idev = ifp->idev;
713 int hash;
714 int deleted = 0, onlink = 0;
715 unsigned long expires = jiffies;
716
717 hash = ipv6_addr_hash(&ifp->addr);
718
719 ifp->dead = 1;
720
721 write_lock_bh(&addrconf_hash_lock);
722 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
723 ifap = &ifa->lst_next) {
724 if (ifa == ifp) {
725 *ifap = ifa->lst_next;
726 __in6_ifa_put(ifp);
727 ifa->lst_next = NULL;
728 break;
729 }
730 }
731 write_unlock_bh(&addrconf_hash_lock);
732
733 write_lock_bh(&idev->lock);
734#ifdef CONFIG_IPV6_PRIVACY
735 if (ifp->flags&IFA_F_TEMPORARY) {
736 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
737 ifap = &ifa->tmp_next) {
738 if (ifa == ifp) {
739 *ifap = ifa->tmp_next;
740 if (ifp->ifpub) {
741 in6_ifa_put(ifp->ifpub);
742 ifp->ifpub = NULL;
743 }
744 __in6_ifa_put(ifp);
745 ifa->tmp_next = NULL;
746 break;
747 }
748 }
749 }
750#endif
751
1d142804 752 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 753 if (ifa == ifp) {
754 *ifap = ifa->if_next;
755 __in6_ifa_put(ifp);
756 ifa->if_next = NULL;
757 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
758 break;
759 deleted = 1;
1d142804 760 continue;
1da177e4
LT		 761 } else if (ifp->flags & IFA_F_PERMANENT) {
762 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
763 ifp->prefix_len)) {
764 if (ifa->flags & IFA_F_PERMANENT) {
765 onlink = 1;
766 if (deleted)
767 break;
768 } else {
769 unsigned long lifetime;
770
771 if (!onlink)
772 onlink = -1;
773
774 spin_lock(&ifa->lock);
4bed72e4
YH		 775
776 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
777 /*
778 * Note: Because this address is
779 * not permanent, lifetime <
780 * LONG_MAX / HZ here.
781 */
1da177e4
LT		 782 if (time_before(expires,
783 ifa->tstamp + lifetime * HZ))
784 expires = ifa->tstamp + lifetime * HZ;
785 spin_unlock(&ifa->lock);
786 }
787 }
788 }
1d142804 789 ifap = &ifa->if_next;
1da177e4
LT		 790 }
791 write_unlock_bh(&idev->lock);
792
b2238566
AV		 793 addrconf_del_timer(ifp);
794
1da177e4
LT		 795 ipv6_ifa_notify(RTM_DELADDR, ifp);
796
e041c683 797 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 798
1da177e4
LT		 799 /*
800 * Purge or update corresponding prefix
801 *
802 * 1) we don't purge prefix here if address was not permanent.
803 * prefix is managed by its own lifetime.
804 * 2) if there're no addresses, delete prefix.
805 * 3) if there're still other permanent address(es),
806 * corresponding prefix is still permanent.
807 * 4) otherwise, update prefix lifetime to the
808 * longest valid lifetime among the corresponding
809 * addresses on the device.
810 * Note: subsequent RA will update lifetime.
811 *
812 * --yoshfuji
813 */
814 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
815 struct in6_addr prefix;
816 struct rt6_info *rt;
c346dca1 817 struct net *net = dev_net(ifp->idev->dev);
1da177e4 818 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 819 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 820
2b5ead46 821 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 822 if (onlink == 0) {
e0a1ad73 823 ip6_del_rt(rt);
1da177e4
LT		 824 rt = NULL;
825 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
826 rt->rt6i_expires = expires;
827 rt->rt6i_flags |= RTF_EXPIRES;
828 }
829 }
830 dst_release(&rt->u.dst);
831 }
832
833 in6_ifa_put(ifp);
834}
835
836#ifdef CONFIG_IPV6_PRIVACY
837static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
838{
839 struct inet6_dev *idev = ifp->idev;
840 struct in6_addr addr, *tmpaddr;
841 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 842 unsigned long regen_advance;
1da177e4
LT		 843 int tmp_plen;
844 int ret = 0;
845 int max_addresses;
95c385b4 846 u32 addr_flags;
1da177e4
LT		 847
848 write_lock(&idev->lock);
849 if (ift) {
850 spin_lock_bh(&ift->lock);
851 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
852 spin_unlock_bh(&ift->lock);
853 tmpaddr = &addr;
854 } else {
855 tmpaddr = NULL;
856 }
857retry:
858 in6_dev_hold(idev);
859 if (idev->cnf.use_tempaddr <= 0) {
860 write_unlock(&idev->lock);
861 printk(KERN_INFO
862 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
863 in6_dev_put(idev);
864 ret = -1;
865 goto out;
866 }
867 spin_lock_bh(&ifp->lock);
868 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
869 idev->cnf.use_tempaddr = -1; /*XXX*/
870 spin_unlock_bh(&ifp->lock);
871 write_unlock(&idev->lock);
872 printk(KERN_WARNING
873 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 in6_ifa_hold(ifp);
879 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
880 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
881 spin_unlock_bh(&ifp->lock);
882 write_unlock(&idev->lock);
883 printk(KERN_WARNING
884 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
885 in6_ifa_put(ifp);
886 in6_dev_put(idev);
887 ret = -1;
888 goto out;
889 }
890 memcpy(&addr.s6_addr[8], idev->rndid, 8);
891 tmp_valid_lft = min_t(__u32,
892 ifp->valid_lft,
893 idev->cnf.temp_valid_lft);
1ab1457c
YH		 894 tmp_prefered_lft = min_t(__u32,
895 ifp->prefered_lft,
1da177e4
LT		 896 idev->cnf.temp_prefered_lft - desync_factor / HZ);
897 tmp_plen = ifp->prefix_len;
898 max_addresses = idev->cnf.max_addresses;
899 tmp_cstamp = ifp->cstamp;
900 tmp_tstamp = ifp->tstamp;
901 spin_unlock_bh(&ifp->lock);
902
eac55bf9
BB		 903 regen_advance = idev->cnf.regen_max_retry *
904 idev->cnf.dad_transmits *
905 idev->nd_parms->retrans_time / HZ;
1da177e4 906 write_unlock(&idev->lock);
95c385b4 907
eac55bf9
BB		 908 /* A temporary address is created only if this calculated Preferred
909 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
910 * an implementation must not create a temporary address with a zero
911 * Preferred Lifetime.
912 */
913 if (tmp_prefered_lft <= regen_advance) {
914 in6_ifa_put(ifp);
915 in6_dev_put(idev);
916 ret = -1;
917 goto out;
918 }
919
95c385b4
NH		 920 addr_flags = IFA_F_TEMPORARY;
921 /* set in addrconf_prefix_rcv() */
922 if (ifp->flags & IFA_F_OPTIMISTIC)
923 addr_flags |= IFA_F_OPTIMISTIC;
924
1da177e4 925 ift = !max_addresses ||
1ab1457c 926 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 927 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 928 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
929 addr_flags) : NULL;
1da177e4
LT		 930 if (!ift || IS_ERR(ift)) {
931 in6_ifa_put(ifp);
932 in6_dev_put(idev);
933 printk(KERN_INFO
934 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
935 tmpaddr = &addr;
936 write_lock(&idev->lock);
937 goto retry;
938 }
939
940 spin_lock_bh(&ift->lock);
941 ift->ifpub = ifp;
942 ift->valid_lft = tmp_valid_lft;
943 ift->prefered_lft = tmp_prefered_lft;
944 ift->cstamp = tmp_cstamp;
945 ift->tstamp = tmp_tstamp;
946 spin_unlock_bh(&ift->lock);
947
948 addrconf_dad_start(ift, 0);
949 in6_ifa_put(ift);
950 in6_dev_put(idev);
951out:
952 return ret;
953}
954#endif
955
956/*
072047e4 957 * Choose an appropriate source address (RFC3484)
1da177e4 958 */
a9b05723
YH		 959enum {
960 IPV6_SADDR_RULE_INIT = 0,
961 IPV6_SADDR_RULE_LOCAL,
962 IPV6_SADDR_RULE_SCOPE,
963 IPV6_SADDR_RULE_PREFERRED,
964#ifdef CONFIG_IPV6_MIP6
965 IPV6_SADDR_RULE_HOA,
966#endif
967 IPV6_SADDR_RULE_OIF,
968 IPV6_SADDR_RULE_LABEL,
969#ifdef CONFIG_IPV6_PRIVACY
970 IPV6_SADDR_RULE_PRIVACY,
971#endif
972 IPV6_SADDR_RULE_ORCHID,
973 IPV6_SADDR_RULE_PREFIX,
974 IPV6_SADDR_RULE_MAX
975};
976
072047e4 977struct ipv6_saddr_score {
a9b05723
YH		 978 int rule;
979 int addr_type;
980 struct inet6_ifaddr *ifa;
981 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
982 int scopedist;
983 int matchlen;
072047e4
YH		 984};
985
a9b05723 986struct ipv6_saddr_dst {
9acd9f3a 987 const struct in6_addr *addr;
a9b05723
YH		 988 int ifindex;
989 int scope;
990 int label;
7cbca67c 991 unsigned int prefs;
a9b05723 992};
072047e4 993
b6f99a21 994static inline int ipv6_saddr_preferred(int type)
1da177e4 995{
45bb0060 996 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 997 return 1;
998 return 0;
1da177e4
LT		 999}
1000
3de23255
BT		 1001static int ipv6_get_saddr_eval(struct net *net,
1002 struct ipv6_saddr_score *score,
a9b05723
YH		 1003 struct ipv6_saddr_dst *dst,
1004 int i)
1005{
1006 int ret;
1007
1008 if (i <= score->rule) {
1009 switch (i) {
1010 case IPV6_SADDR_RULE_SCOPE:
1011 ret = score->scopedist;
1012 break;
1013 case IPV6_SADDR_RULE_PREFIX:
1014 ret = score->matchlen;
1015 break;
1016 default:
1017 ret = !!test_bit(i, score->scorebits);
1018 }
1019 goto out;
1020 }
1021
1022 switch (i) {
1023 case IPV6_SADDR_RULE_INIT:
1024 /* Rule 0: remember if hiscore is not ready yet */
1025 ret = !!score->ifa;
1026 break;
1027 case IPV6_SADDR_RULE_LOCAL:
1028 /* Rule 1: Prefer same address */
1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030 break;
1031 case IPV6_SADDR_RULE_SCOPE:
1032 /* Rule 2: Prefer appropriate scope
1033 *
1034 * ret
1035 * ^
1036 * -1 | d 15
1037 * ---+--+-+---> scope
1038 * |
1039 * | d is scope of the destination.
1040 * B-d | \
1041 * | \ <- smaller scope is better if
1042 * B-15 | \ if scope is enough for destinaion.
1043 * | ret = B - scope (-1 <= scope >= d <= 15).
1044 * d-C-1 | /
1045 * |/ <- greater is better
1046 * -C / if scope is not enough for destination.
1047 * /| ret = scope - C (-1 <= d < scope <= 15).
1048 *
1049 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051 * Assume B = 0 and we get C > 29.
1052 */
1053 ret = __ipv6_addr_src_scope(score->addr_type);
1054 if (ret >= dst->scope)
1055 ret = -ret;
1056 else
1057 ret -= 128; /* 30 is enough */
1058 score->scopedist = ret;
1059 break;
1060 case IPV6_SADDR_RULE_PREFERRED:
1061 /* Rule 3: Avoid deprecated and optimistic addresses */
1062 ret = ipv6_saddr_preferred(score->addr_type) ||
1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064 break;
1065#ifdef CONFIG_IPV6_MIP6
1066 case IPV6_SADDR_RULE_HOA:
7cbca67c 1067 {
a9b05723 1068 /* Rule 4: Prefer home address */
7cbca67c
YH		 1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1071 break;
7cbca67c 1072 }
a9b05723
YH		 1073#endif
1074 case IPV6_SADDR_RULE_OIF:
1075 /* Rule 5: Prefer outgoing interface */
1076 ret = (!dst->ifindex ||
1077 dst->ifindex == score->ifa->idev->dev->ifindex);
1078 break;
1079 case IPV6_SADDR_RULE_LABEL:
1080 /* Rule 6: Prefer matching label */
3de23255
BT		 1081 ret = ipv6_addr_label(net,
1082 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1083 score->ifa->idev->dev->ifindex) == dst->label;
1084 break;
1085#ifdef CONFIG_IPV6_PRIVACY
1086 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1087 {
a9b05723
YH		 1088 /* Rule 7: Prefer public address
1089 * Note: prefer temprary address if use_tempaddr >= 2
1090 */
7cbca67c
YH		 1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093 score->ifa->idev->cnf.use_tempaddr >= 2;
1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1095 break;
7cbca67c 1096 }
a9b05723
YH		 1097#endif
1098 case IPV6_SADDR_RULE_ORCHID:
1099 /* Rule 8-: Prefer ORCHID vs ORCHID or
1100 * non-ORCHID vs non-ORCHID
1101 */
1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103 ipv6_addr_orchid(dst->addr));
1104 break;
1105 case IPV6_SADDR_RULE_PREFIX:
1106 /* Rule 8: Use longest matching prefix */
1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1108 dst->addr);
1109 break;
1110 default:
1111 ret = 0;
1112 }
1113
1114 if (ret)
1115 __set_bit(i, score->scorebits);
1116 score->rule = i;
1117out:
1118 return ret;
1119}
1120
191cd582 1121int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1122 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1123 struct in6_addr *saddr)
1da177e4 1124{
a9b05723
YH		 1125 struct ipv6_saddr_score scores[2],
1126 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1127 struct ipv6_saddr_dst dst;
072047e4 1128 struct net_device *dev;
a9b05723 1129 int dst_type;
1da177e4 1130
a9b05723
YH		 1131 dst_type = __ipv6_addr_type(daddr);
1132 dst.addr = daddr;
1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1136 dst.prefs = prefs;
a9b05723
YH		 1137
1138 hiscore->rule = -1;
1139 hiscore->ifa = NULL;
1da177e4 1140
8814c4b5 1141 rcu_read_lock();
1da177e4 1142
c6d14c84 1143 for_each_netdev_rcu(net, dev) {
072047e4 1144 struct inet6_dev *idev;
072047e4 1145
a9b05723 1146 /* Candidate Source Address (section 4)
072047e4
YH		 1147 * - multicast and link-local destination address,
1148 * the set of candidate source address MUST only
1149 * include addresses assigned to interfaces
1150 * belonging to the same link as the outgoing
1151 * interface.
1152 * (- For site-local destination addresses, the
1153 * set of candidate source addresses MUST only
1154 * include addresses assigned to interfaces
1155 * belonging to the same site as the outgoing
1156 * interface.)
1157 */
a9b05723
YH		 1158 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1161 continue;
1da177e4 1162
1da177e4 1163 idev = __in6_dev_get(dev);
072047e4
YH		 1164 if (!idev)
1165 continue;
1166
1167 read_lock_bh(&idev->lock);
a9b05723
YH		 1168 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1169 int i;
072047e4 1170
a9b05723 1171 /*
6b3ae80a
YH		 1172 * - Tentative Address (RFC2462 section 5.4)
1173 * - A tentative address is not considered
1174 * "assigned to an interface" in the traditional
95c385b4 1175 * sense, unless it is also flagged as optimistic.
6b3ae80a 1176 * - Candidate Source Address (section 4)
072047e4
YH		 1177 * - In any case, anycast addresses, multicast
1178 * addresses, and the unspecified address MUST
1179 * NOT be included in a candidate set.
1180 */
a9b05723
YH		 1181 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1183 continue;
a9b05723
YH		 1184
1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186
1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1189 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1190 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1191 "assigned as unicast address on %s",
1192 dev->name);
1193 continue;
1194 }
1195
a9b05723
YH		 1196 score->rule = -1;
1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198
1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200 int minihiscore, miniscore;
1201
3de23255
BT		 1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1204
1205 if (minihiscore > miniscore) {
1206 if (i == IPV6_SADDR_RULE_SCOPE &&
1207 score->scopedist > 0) {
1208 /*
1209 * special case:
1210 * each remaining entry
1211 * has too small (not enough)
1212 * scope, because ifa entries
1213 * are sorted by their scope
1214 * values.
1215 */
1216 goto try_nextdev;
1217 }
1218 break;
1219 } else if (minihiscore < miniscore) {
a9b05723
YH		 1220 if (hiscore->ifa)
1221 in6_ifa_put(hiscore->ifa);
1222
1223 in6_ifa_hold(score->ifa);
1224
a0bffffc 1225 swap(hiscore, score);
a9b05723
YH		 1226
1227 /* restore our iterator */
1228 score->ifa = hiscore->ifa;
1229
1230 break;
1da177e4 1231 }
072047e4 1232 }
1da177e4 1233 }
a9b05723 1234try_nextdev:
072047e4 1235 read_unlock_bh(&idev->lock);
1da177e4 1236 }
8814c4b5 1237 rcu_read_unlock();
1da177e4 1238
a9b05723 1239 if (!hiscore->ifa)
072047e4 1240 return -EADDRNOTAVAIL;
1ab1457c 1241
a9b05723
YH		 1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243 in6_ifa_put(hiscore->ifa);
072047e4 1244 return 0;
1da177e4
LT		 1245}
1246
5e5f3f0f 1247EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1248
95c385b4
NH		 1249int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250 unsigned char banned_flags)
1da177e4
LT		 1251{
1252 struct inet6_dev *idev;
1253 int err = -EADDRNOTAVAIL;
1254
8814c4b5 1255 rcu_read_lock();
1da177e4
LT		 1256 if ((idev = __in6_dev_get(dev)) != NULL) {
1257 struct inet6_ifaddr *ifp;
1258
1259 read_lock_bh(&idev->lock);
1260 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1261 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1262 ipv6_addr_copy(addr, &ifp->addr);
1263 err = 0;
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&idev->lock);
1268 }
8814c4b5 1269 rcu_read_unlock();
1da177e4
LT		 1270 return err;
1271}
1272
1273static int ipv6_count_addresses(struct inet6_dev *idev)
1274{
1275 int cnt = 0;
1276 struct inet6_ifaddr *ifp;
1277
1278 read_lock_bh(&idev->lock);
1279 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1280 cnt++;
1281 read_unlock_bh(&idev->lock);
1282 return cnt;
1283}
1284
bfeade08
DL		 1285int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 struct net_device *dev, int strict)
1da177e4
LT		 1287{
1288 struct inet6_ifaddr * ifp;
1289 u8 hash = ipv6_addr_hash(addr);
1290
1291 read_lock_bh(&addrconf_hash_lock);
1292 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1293 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1294 continue;
1da177e4
LT		 1295 if (ipv6_addr_equal(&ifp->addr, addr) &&
1296 !(ifp->flags&IFA_F_TENTATIVE)) {
1297 if (dev == NULL || ifp->idev->dev == dev ||
1298 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1299 break;
1300 }
1301 }
1302 read_unlock_bh(&addrconf_hash_lock);
1303 return ifp != NULL;
1304}
7159039a
YH		 1305EXPORT_SYMBOL(ipv6_chk_addr);
1306
1da177e4 1307static
06bfe655
DL		 1308int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1da177e4
LT		 1310{
1311 struct inet6_ifaddr * ifp;
1312 u8 hash = ipv6_addr_hash(addr);
1313
1314 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1315 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1316 continue;
1da177e4
LT		 1317 if (ipv6_addr_equal(&ifp->addr, addr)) {
1318 if (dev == NULL || ifp->idev->dev == dev)
1319 break;
1320 }
1321 }
1322 return ifp != NULL;
1323}
1324
52eeeb84
YH		 1325int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1326{
1327 struct inet6_dev *idev;
1328 struct inet6_ifaddr *ifa;
1329 int onlink;
1330
1331 onlink = 0;
1332 rcu_read_lock();
1333 idev = __in6_dev_get(dev);
1334 if (idev) {
1335 read_lock_bh(&idev->lock);
1336 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1337 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1338 ifa->prefix_len);
1339 if (onlink)
1340 break;
1341 }
1342 read_unlock_bh(&idev->lock);
1343 }
1344 rcu_read_unlock();
1345 return onlink;
1346}
1347
1348EXPORT_SYMBOL(ipv6_chk_prefix);
1349
9acd9f3a 1350struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1351 struct net_device *dev, int strict)
1da177e4
LT		 1352{
1353 struct inet6_ifaddr * ifp;
1354 u8 hash = ipv6_addr_hash(addr);
1355
1356 read_lock_bh(&addrconf_hash_lock);
1357 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
878628fb 1358 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1359 continue;
1da177e4
LT		 1360 if (ipv6_addr_equal(&ifp->addr, addr)) {
1361 if (dev == NULL || ifp->idev->dev == dev ||
1362 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1363 in6_ifa_hold(ifp);
1364 break;
1365 }
1366 }
1367 }
1368 read_unlock_bh(&addrconf_hash_lock);
1369
1370 return ifp;
1371}
1372
1da177e4
LT		 1373/* Gets referenced address, destroys ifaddr */
1374
cc411d0b 1375static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1376{
1da177e4
LT		 1377 if (ifp->flags&IFA_F_PERMANENT) {
1378 spin_lock_bh(&ifp->lock);
1379 addrconf_del_timer(ifp);
1380 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1381 if (dad_failed)
1382 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1383 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1384 if (dad_failed)
1385 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1386 in6_ifa_put(ifp);
1387#ifdef CONFIG_IPV6_PRIVACY
1388 } else if (ifp->flags&IFA_F_TEMPORARY) {
1389 struct inet6_ifaddr *ifpub;
1390 spin_lock_bh(&ifp->lock);
1391 ifpub = ifp->ifpub;
1392 if (ifpub) {
1393 in6_ifa_hold(ifpub);
1394 spin_unlock_bh(&ifp->lock);
1395 ipv6_create_tempaddr(ifpub, ifp);
1396 in6_ifa_put(ifpub);
1397 } else {
1398 spin_unlock_bh(&ifp->lock);
1399 }
1400 ipv6_del_addr(ifp);
1401#endif
1402 } else
1403 ipv6_del_addr(ifp);
1404}
1405
3c21edbd
YH		 1406void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1407{
1b34be74 1408 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1409
1410 if (net_ratelimit())
0522fea6
JR		 1411 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1412 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1413
1b34be74
YH		 1414 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1415 struct in6_addr addr;
1416
1417 addr.s6_addr32[0] = htonl(0xfe800000);
1418 addr.s6_addr32[1] = 0;
1419
1420 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1421 ipv6_addr_equal(&ifp->addr, &addr)) {
1422 /* DAD failed for link-local based on MAC address */
1423 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1424
1425 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1426 ifp->idev->dev->name);
1b34be74
YH		 1427 }
1428 }
1429
cc411d0b 1430 addrconf_dad_stop(ifp, 1);
3c21edbd 1431}
1da177e4
LT		 1432
1433/* Join to solicited addr multicast group. */
1434
1435void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1436{
1437 struct in6_addr maddr;
1438
1439 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1440 return;
1441
1442 addrconf_addr_solict_mult(addr, &maddr);
1443 ipv6_dev_mc_inc(dev, &maddr);
1444}
1445
1446void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1447{
1448 struct in6_addr maddr;
1449
1450 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1451 return;
1452
1453 addrconf_addr_solict_mult(addr, &maddr);
1454 __ipv6_dev_mc_dec(idev, &maddr);
1455}
1456
20380731 1457static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1458{
1459 struct in6_addr addr;
1460 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1461 if (ipv6_addr_any(&addr))
1462 return;
1463 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1464}
1465
20380731 1466static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1467{
1468 struct in6_addr addr;
1469 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1470 if (ipv6_addr_any(&addr))
1471 return;
1472 __ipv6_dev_ac_dec(ifp->idev, &addr);
1473}
1474
073a8e0e
YH		 1475static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1476{
1477 if (dev->addr_len != ETH_ALEN)
1478 return -1;
1479 memcpy(eui, dev->dev_addr, 3);
1480 memcpy(eui + 5, dev->dev_addr + 3, 3);
1481
1482 /*
1483 * The zSeries OSA network cards can be shared among various
1484 * OS instances, but the OSA cards have only one MAC address.
1485 * This leads to duplicate address conflicts in conjunction
1486 * with IPv6 if more than one instance uses the same card.
1487 *
1488 * The driver for these cards can deliver a unique 16-bit
1489 * identifier for each instance sharing the same card. It is
1490 * placed instead of 0xFFFE in the interface identifier. The
1491 * "u" bit of the interface identifier is not inverted in this
1492 * case. Hence the resulting interface identifier has local
1493 * scope according to RFC2373.
1494 */
1495 if (dev->dev_id) {
1496 eui[3] = (dev->dev_id >> 8) & 0xFF;
1497 eui[4] = dev->dev_id & 0xFF;
1498 } else {
1499 eui[3] = 0xFF;
1500 eui[4] = 0xFE;
1501 eui[0] ^= 2;
1502 }
1503 return 0;
1504}
1505
1506static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1507{
1508 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1509 if (dev->addr_len != ARCNET_ALEN)
1510 return -1;
1511 memset(eui, 0, 7);
1512 eui[7] = *(u8*)dev->dev_addr;
1513 return 0;
1514}
1515
1516static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1517{
1518 if (dev->addr_len != INFINIBAND_ALEN)
1519 return -1;
1520 memcpy(eui, dev->dev_addr + 12, 8);
1521 eui[0] |= 2;
1522 return 0;
1523}
1524
dfd982ba
YH		 1525int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1526{
9af28511
SH		 1527 if (addr == 0)
1528 return -1;
dfd982ba
YH		 1529 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1530 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1531 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1532 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1533 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1534 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1535 eui[1] = 0;
1536 eui[2] = 0x5E;
1537 eui[3] = 0xFE;
1538 memcpy(eui + 4, &addr, 4);
1539 return 0;
1540}
1541EXPORT_SYMBOL(__ipv6_isatap_ifid);
1542
1543static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1544{
1545 if (dev->priv_flags & IFF_ISATAP)
1546 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1547 return -1;
1548}
1549
1da177e4
LT		 1550static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1551{
1552 switch (dev->type) {
1553 case ARPHRD_ETHER:
1554 case ARPHRD_FDDI:
1555 case ARPHRD_IEEE802_TR:
073a8e0e 1556 return addrconf_ifid_eui48(eui, dev);
1da177e4 1557 case ARPHRD_ARCNET:
073a8e0e 1558 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1559 case ARPHRD_INFINIBAND:
073a8e0e 1560 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1561 case ARPHRD_SIT:
dfd982ba 1562 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1563 }
1564 return -1;
1565}
1566
1567static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1568{
1569 int err = -1;
1570 struct inet6_ifaddr *ifp;
1571
1572 read_lock_bh(&idev->lock);
1573 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1574 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1575 memcpy(eui, ifp->addr.s6_addr+8, 8);
1576 err = 0;
1577 break;
1578 }
1579 }
1580 read_unlock_bh(&idev->lock);
1581 return err;
1582}
1583
1584#ifdef CONFIG_IPV6_PRIVACY
1585/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1586static int __ipv6_regen_rndid(struct inet6_dev *idev)
1587{
1da177e4 1588regen:
955189ef 1589 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1590 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1591
1592 /*
1593 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1594 * check if generated address is not inappropriate
1595 *
1596 * - Reserved subnet anycast (RFC 2526)
1597 * 11111101 11....11 1xxxxxxx
c7dc89c0 1598 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1599 * 00-00-5E-FE-xx-xx-xx-xx
1600 * - value 0
1601 * - XXX: already assigned to an address on the device
1602 */
1ab1457c 1603 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1604 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1605 (idev->rndid[7]&0x80))
1606 goto regen;
1607 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1608 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1609 goto regen;
1610 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1611 goto regen;
1612 }
1613
1614 return 0;
1615}
1616
1617static void ipv6_regen_rndid(unsigned long data)
1618{
1619 struct inet6_dev *idev = (struct inet6_dev *) data;
1620 unsigned long expires;
1621
8814c4b5 1622 rcu_read_lock_bh();
1da177e4
LT		 1623 write_lock_bh(&idev->lock);
1624
1625 if (idev->dead)
1626 goto out;
1627
1628 if (__ipv6_regen_rndid(idev) < 0)
1629 goto out;
1ab1457c 1630
1da177e4 1631 expires = jiffies +
1ab1457c 1632 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1633 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1634 if (time_before(expires, jiffies)) {
1635 printk(KERN_WARNING
1636 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1637 idev->dev->name);
1638 goto out;
1639 }
1640
1641 if (!mod_timer(&idev->regen_timer, expires))
1642 in6_dev_hold(idev);
1643
1644out:
1645 write_unlock_bh(&idev->lock);
8814c4b5 1646 rcu_read_unlock_bh();
1da177e4
LT		 1647 in6_dev_put(idev);
1648}
1649
1650static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1651 int ret = 0;
1652
1653 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1654 ret = __ipv6_regen_rndid(idev);
1655 return ret;
1656}
1657#endif
1658
1659/*
1660 * Add prefix route.
1661 */
1662
1663static void
1664addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1665 unsigned long expires, u32 flags)
1da177e4 1666{
86872cb5
TG		 1667 struct fib6_config cfg = {
1668 .fc_table = RT6_TABLE_PREFIX,
1669 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1670 .fc_ifindex = dev->ifindex,
1671 .fc_expires = expires,
1672 .fc_dst_len = plen,
1673 .fc_flags = RTF_UP | flags,
c346dca1 1674 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1675 .fc_protocol = RTPROT_KERNEL,
86872cb5 1676 };
1da177e4 1677
86872cb5 1678 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1679
1680 /* Prevent useless cloning on PtP SIT.
1681 This thing is done here expecting that the whole
1682 class of non-broadcast devices need not cloning.
1683 */
0be669bb 1684#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1685 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1686 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1687#endif
1da177e4 1688
86872cb5 1689 ip6_route_add(&cfg);
1da177e4
LT		 1690}
1691
1692/* Create "default" multicast route to the interface */
1693
1694static void addrconf_add_mroute(struct net_device *dev)
1695{
86872cb5
TG		 1696 struct fib6_config cfg = {
1697 .fc_table = RT6_TABLE_LOCAL,
1698 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1699 .fc_ifindex = dev->ifindex,
1700 .fc_dst_len = 8,
1701 .fc_flags = RTF_UP,
c346dca1 1702 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1703 };
1704
1705 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1706
1707 ip6_route_add(&cfg);
1da177e4
LT		 1708}
1709
0be669bb 1710#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1711static void sit_route_add(struct net_device *dev)
1712{
86872cb5
TG		 1713 struct fib6_config cfg = {
1714 .fc_table = RT6_TABLE_MAIN,
1715 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1716 .fc_ifindex = dev->ifindex,
1717 .fc_dst_len = 96,
1718 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1719 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1720 };
1da177e4
LT		 1721
1722 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1723 ip6_route_add(&cfg);
1da177e4 1724}
0be669bb 1725#endif
1da177e4
LT		 1726
1727static void addrconf_add_lroute(struct net_device *dev)
1728{
1729 struct in6_addr addr;
1730
1731 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1732 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1733}
1734
1735static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1736{
1737 struct inet6_dev *idev;
1738
1739 ASSERT_RTNL();
1740
1741 if ((idev = ipv6_find_idev(dev)) == NULL)
1742 return NULL;
1743
1744 /* Add default multicast route */
1745 addrconf_add_mroute(dev);
1746
1747 /* Add link local route */
1748 addrconf_add_lroute(dev);
1749 return idev;
1750}
1751
1752void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1753{
1754 struct prefix_info *pinfo;
1755 __u32 valid_lft;
1756 __u32 prefered_lft;
1757 int addr_type;
1da177e4 1758 struct inet6_dev *in6_dev;
56d417b1 1759 struct net *net = dev_net(dev);
1da177e4
LT		 1760
1761 pinfo = (struct prefix_info *) opt;
1ab1457c 1762
1da177e4
LT		 1763 if (len < sizeof(struct prefix_info)) {
1764 ADBG(("addrconf: prefix option too short\n"));
1765 return;
1766 }
1ab1457c 1767
1da177e4
LT		 1768 /*
1769 * Validation checks ([ADDRCONF], page 19)
1770 */
1771
1772 addr_type = ipv6_addr_type(&pinfo->prefix);
1773
1774 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1775 return;
1776
1777 valid_lft = ntohl(pinfo->valid);
1778 prefered_lft = ntohl(pinfo->prefered);
1779
1780 if (prefered_lft > valid_lft) {
1781 if (net_ratelimit())
1782 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1783 return;
1784 }
1785
1786 in6_dev = in6_dev_get(dev);
1787
1788 if (in6_dev == NULL) {
1789 if (net_ratelimit())
1790 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1791 return;
1792 }
1793
1794 /*
1795 * Two things going on here:
1796 * 1) Add routes for on-link prefixes
1797 * 2) Configure prefixes with the auto flag set
1798 */
1799
4bed72e4
YH		 1800 if (pinfo->onlink) {
1801 struct rt6_info *rt;
1802 unsigned long rt_expires;
1803
6f704992
YH		 1804 /* Avoid arithmetic overflow. Really, we could
1805 * save rt_expires in seconds, likely valid_lft,
1806 * but it would require division in fib gc, that it
1807 * not good.
1808 */
4bed72e4
YH		 1809 if (HZ > USER_HZ)
1810 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1811 else
1812 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1813
4bed72e4
YH		 1814 if (addrconf_finite_timeout(rt_expires))
1815 rt_expires *= HZ;
1da177e4 1816
56d417b1 1817 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1818 dev->ifindex, 1);
1da177e4 1819
2b5ead46 1820 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1821 /* Autoconf prefix route */
1822 if (valid_lft == 0) {
1823 ip6_del_rt(rt);
1824 rt = NULL;
4bed72e4 1825 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1826 /* not infinity */
1827 rt->rt6i_expires = jiffies + rt_expires;
1828 rt->rt6i_flags |= RTF_EXPIRES;
1829 } else {
1830 rt->rt6i_flags &= ~RTF_EXPIRES;
1831 rt->rt6i_expires = 0;
1da177e4
LT		 1832 }
1833 } else if (valid_lft) {
6f704992 1834 clock_t expires = 0;
4bed72e4
YH		 1835 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1836 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1837 /* not infinity */
1838 flags |= RTF_EXPIRES;
1839 expires = jiffies_to_clock_t(rt_expires);
1840 }
1da177e4 1841 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1842 dev, expires, flags);
1da177e4
LT		 1843 }
1844 if (rt)
1845 dst_release(&rt->u.dst);
1846 }
1847
1848 /* Try to figure out our local address for this prefix */
1849
1850 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1851 struct inet6_ifaddr * ifp;
1852 struct in6_addr addr;
1853 int create = 0, update_lft = 0;
1854
1855 if (pinfo->prefix_len == 64) {
1856 memcpy(&addr, &pinfo->prefix, 8);
1857 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1858 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1859 in6_dev_put(in6_dev);
1860 return;
1861 }
1862 goto ok;
1863 }
1864 if (net_ratelimit())
1865 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1866 pinfo->prefix_len);
1867 in6_dev_put(in6_dev);
1868 return;
1869
1870ok:
1871
53b7997f 1872 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1873
1874 if (ifp == NULL && valid_lft) {
1875 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1876 u32 addr_flags = 0;
1877
1878#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1879 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1880 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1881 addr_flags = IFA_F_OPTIMISTIC;
1882#endif
1da177e4
LT		 1883
1884 /* Do not allow to create too much of autoconfigured
1885 * addresses; this would be too easy way to crash kernel.
1886 */
1887 if (!max_addresses ||
1888 ipv6_count_addresses(in6_dev) < max_addresses)
1889 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1890 addr_type&IPV6_ADDR_SCOPE_MASK,
1891 addr_flags);
1da177e4
LT		 1892
1893 if (!ifp || IS_ERR(ifp)) {
1894 in6_dev_put(in6_dev);
1895 return;
1896 }
1897
1898 update_lft = create = 1;
1899 ifp->cstamp = jiffies;
1900 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1901 }
1902
1903 if (ifp) {
1904 int flags;
1905 unsigned long now;
1906#ifdef CONFIG_IPV6_PRIVACY
1907 struct inet6_ifaddr *ift;
1908#endif
1909 u32 stored_lft;
1910
1911 /* update lifetime (RFC2462 5.5.3 e) */
1912 spin_lock(&ifp->lock);
1913 now = jiffies;
1914 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1915 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1916 else
1917 stored_lft = 0;
1918 if (!update_lft && stored_lft) {
1919 if (valid_lft > MIN_VALID_LIFETIME ||
1920 valid_lft > stored_lft)
1921 update_lft = 1;
1922 else if (stored_lft <= MIN_VALID_LIFETIME) {
1923 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1924 /*
1925 * RFC 4862 Section 5.5.3e:
1926 * "Note that the preferred lifetime of
1927 * the corresponding address is always
1928 * reset to the Preferred Lifetime in
1929 * the received Prefix Information
1930 * option, regardless of whether the
1931 * valid lifetime is also reset or
1932 * ignored."
1933 *
1934 * So if the preferred lifetime in
1935 * this advertisement is different
1936 * than what we have stored, but the
1937 * valid lifetime is invalid, just
1938 * reset prefered_lft.
1939 *
1940 * We must set the valid lifetime
1941 * to the stored lifetime since we'll
1942 * be updating the timestamp below,
1943 * else we'll set it back to the
1944 * minumum.
1945 */
1946 if (prefered_lft != ifp->prefered_lft) {
1947 valid_lft = stored_lft;
1948 update_lft = 1;
1949 }
1da177e4
LT		 1950 } else {
1951 valid_lft = MIN_VALID_LIFETIME;
1952 if (valid_lft < prefered_lft)
1953 prefered_lft = valid_lft;
1954 update_lft = 1;
1955 }
1956 }
1957
1958 if (update_lft) {
1959 ifp->valid_lft = valid_lft;
1960 ifp->prefered_lft = prefered_lft;
1961 ifp->tstamp = now;
1962 flags = ifp->flags;
1963 ifp->flags &= ~IFA_F_DEPRECATED;
1964 spin_unlock(&ifp->lock);
1965
1966 if (!(flags&IFA_F_TENTATIVE))
1967 ipv6_ifa_notify(0, ifp);
1968 } else
1969 spin_unlock(&ifp->lock);
1970
1971#ifdef CONFIG_IPV6_PRIVACY
1972 read_lock_bh(&in6_dev->lock);
1973 /* update all temporary addresses in the list */
1974 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1975 /*
1976 * When adjusting the lifetimes of an existing
1977 * temporary address, only lower the lifetimes.
1978 * Implementations must not increase the
1979 * lifetimes of an existing temporary address
1980 * when processing a Prefix Information Option.
1981 */
c6fbfac2
BB		 1982 if (ifp != ift->ifpub)
1983 continue;
1984
1da177e4
LT		 1985 spin_lock(&ift->lock);
1986 flags = ift->flags;
1987 if (ift->valid_lft > valid_lft &&
1988 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1989 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1990 if (ift->prefered_lft > prefered_lft &&
1991 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1992 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1993 spin_unlock(&ift->lock);
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ift);
1996 }
1997
1998 if (create && in6_dev->cnf.use_tempaddr > 0) {
1999 /*
2000 * When a new public address is created as described in [ADDRCONF],
2001 * also create a new temporary address.
2002 */
1ab1457c 2003 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2004 ipv6_create_tempaddr(ifp, NULL);
2005 } else {
2006 read_unlock_bh(&in6_dev->lock);
2007 }
2008#endif
2009 in6_ifa_put(ifp);
2010 addrconf_verify(0);
2011 }
2012 }
2013 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2014 in6_dev_put(in6_dev);
2015}
2016
2017/*
2018 * Set destination address.
2019 * Special case for SIT interfaces where we create a new "virtual"
2020 * device.
2021 */
af284937 2022int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2023{
2024 struct in6_ifreq ireq;
2025 struct net_device *dev;
2026 int err = -EINVAL;
2027
2028 rtnl_lock();
2029
2030 err = -EFAULT;
2031 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2032 goto err_exit;
2033
af284937 2034 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2035
2036 err = -ENODEV;
2037 if (dev == NULL)
2038 goto err_exit;
2039
0be669bb 2040#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2041 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2042 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2043 struct ifreq ifr;
1da177e4
LT		 2044 struct ip_tunnel_parm p;
2045
2046 err = -EADDRNOTAVAIL;
2047 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2048 goto err_exit;
2049
2050 memset(&p, 0, sizeof(p));
2051 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2052 p.iph.saddr = 0;
2053 p.iph.version = 4;
2054 p.iph.ihl = 5;
2055 p.iph.protocol = IPPROTO_IPV6;
2056 p.iph.ttl = 64;
d20b3109 2057 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2058
5bc3eb7e
SH		 2059 if (ops->ndo_do_ioctl) {
2060 mm_segment_t oldfs = get_fs();
2061
2062 set_fs(KERNEL_DS);
2063 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2064 set_fs(oldfs);
2065 } else
2066 err = -EOPNOTSUPP;
1da177e4
LT		 2067
2068 if (err == 0) {
2069 err = -ENOBUFS;
af284937
DL		 2070 dev = __dev_get_by_name(net, p.name);
2071 if (!dev)
1da177e4
LT		 2072 goto err_exit;
2073 err = dev_open(dev);
2074 }
2075 }
0be669bb 2076#endif
1da177e4
LT		 2077
2078err_exit:
2079 rtnl_unlock();
2080 return err;
2081}
2082
2083/*
2084 * Manual configuration of address on an interface
2085 */
af284937 2086static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2087 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2088 __u32 valid_lft)
1da177e4
LT		 2089{
2090 struct inet6_ifaddr *ifp;
2091 struct inet6_dev *idev;
2092 struct net_device *dev;
2093 int scope;
6f704992
YH		 2094 u32 flags;
2095 clock_t expires;
4bed72e4 2096 unsigned long timeout;
1da177e4
LT		 2097
2098 ASSERT_RTNL();
1ab1457c 2099
24ef0da7
TG		 2100 if (plen > 128)
2101 return -EINVAL;
2102
0778769d
NT		 2103 /* check the lifetime */
2104 if (!valid_lft || prefered_lft > valid_lft)
2105 return -EINVAL;
2106
af284937
DL		 2107 dev = __dev_get_by_index(net, ifindex);
2108 if (!dev)
1da177e4 2109 return -ENODEV;
1ab1457c 2110
1da177e4
LT		 2111 if ((idev = addrconf_add_dev(dev)) == NULL)
2112 return -ENOBUFS;
2113
2114 scope = ipv6_addr_scope(pfx);
2115
4bed72e4
YH		 2116 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2117 if (addrconf_finite_timeout(timeout)) {
2118 expires = jiffies_to_clock_t(timeout * HZ);
2119 valid_lft = timeout;
6f704992 2120 flags = RTF_EXPIRES;
4bed72e4
YH		 2121 } else {
2122 expires = 0;
2123 flags = 0;
2124 ifa_flags |= IFA_F_PERMANENT;
6f704992 2125 }
0778769d 2126
4bed72e4
YH		 2127 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2128 if (addrconf_finite_timeout(timeout)) {
2129 if (timeout == 0)
2130 ifa_flags |= IFA_F_DEPRECATED;
2131 prefered_lft = timeout;
2132 }
0778769d
NT		 2133
2134 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2135
1da177e4 2136 if (!IS_ERR(ifp)) {
06aebfb7 2137 spin_lock_bh(&ifp->lock);
0778769d
NT		 2138 ifp->valid_lft = valid_lft;
2139 ifp->prefered_lft = prefered_lft;
2140 ifp->tstamp = jiffies;
06aebfb7 2141 spin_unlock_bh(&ifp->lock);
0778769d 2142
46d48046 2143 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2144 expires, flags);
95c385b4
NH		 2145 /*
2146 * Note that section 3.1 of RFC 4429 indicates
2147 * that the Optimistic flag should not be set for
2148 * manually configured addresses
2149 */
1da177e4
LT		 2150 addrconf_dad_start(ifp, 0);
2151 in6_ifa_put(ifp);
0778769d 2152 addrconf_verify(0);
1da177e4
LT		 2153 return 0;
2154 }
2155
2156 return PTR_ERR(ifp);
2157}
2158
af284937 2159static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2160 unsigned int plen)
1da177e4
LT		 2161{
2162 struct inet6_ifaddr *ifp;
2163 struct inet6_dev *idev;
2164 struct net_device *dev;
1ab1457c 2165
24ef0da7
TG		 2166 if (plen > 128)
2167 return -EINVAL;
2168
af284937
DL		 2169 dev = __dev_get_by_index(net, ifindex);
2170 if (!dev)
1da177e4
LT		 2171 return -ENODEV;
2172
2173 if ((idev = __in6_dev_get(dev)) == NULL)
2174 return -ENXIO;
2175
2176 read_lock_bh(&idev->lock);
2177 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2178 if (ifp->prefix_len == plen &&
2179 ipv6_addr_equal(pfx, &ifp->addr)) {
2180 in6_ifa_hold(ifp);
2181 read_unlock_bh(&idev->lock);
1ab1457c 2182
1da177e4
LT		 2183 ipv6_del_addr(ifp);
2184
2185 /* If the last address is deleted administratively,
2186 disable IPv6 on this interface.
2187 */
2188 if (idev->addr_list == NULL)
2189 addrconf_ifdown(idev->dev, 1);
2190 return 0;
2191 }
2192 }
2193 read_unlock_bh(&idev->lock);
2194 return -EADDRNOTAVAIL;
2195}
2196
2197
af284937 2198int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2199{
2200 struct in6_ifreq ireq;
2201 int err;
1ab1457c 2202
1da177e4
LT		 2203 if (!capable(CAP_NET_ADMIN))
2204 return -EPERM;
1ab1457c 2205
1da177e4
LT		 2206 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2207 return -EFAULT;
2208
2209 rtnl_lock();
af284937
DL		 2210 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2211 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2212 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2213 rtnl_unlock();
2214 return err;
2215}
2216
af284937 2217int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2218{
2219 struct in6_ifreq ireq;
2220 int err;
1ab1457c 2221
1da177e4
LT		 2222 if (!capable(CAP_NET_ADMIN))
2223 return -EPERM;
2224
2225 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2226 return -EFAULT;
2227
2228 rtnl_lock();
af284937
DL		 2229 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2230 ireq.ifr6_prefixlen);
1da177e4
LT		 2231 rtnl_unlock();
2232 return err;
2233}
2234
b5f348e5
IJ		 2235static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2236 int plen, int scope)
2237{
2238 struct inet6_ifaddr *ifp;
2239
2240 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2241 if (!IS_ERR(ifp)) {
2242 spin_lock_bh(&ifp->lock);
2243 ifp->flags &= ~IFA_F_TENTATIVE;
2244 spin_unlock_bh(&ifp->lock);
2245 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2246 in6_ifa_put(ifp);
2247 }
2248}
2249
0be669bb 2250#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2251static void sit_add_v4_addrs(struct inet6_dev *idev)
2252{
1da177e4
LT		 2253 struct in6_addr addr;
2254 struct net_device *dev;
c346dca1 2255 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2256 int scope;
2257
2258 ASSERT_RTNL();
2259
2260 memset(&addr, 0, sizeof(struct in6_addr));
2261 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2262
2263 if (idev->dev->flags&IFF_POINTOPOINT) {
2264 addr.s6_addr32[0] = htonl(0xfe800000);
2265 scope = IFA_LINK;
2266 } else {
2267 scope = IPV6_ADDR_COMPATv4;
2268 }
2269
2270 if (addr.s6_addr32[3]) {
b5f348e5 2271 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2272 return;
2273 }
2274
6fda7350 2275 for_each_netdev(net, dev) {
e5ed6399 2276 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2277 if (in_dev && (dev->flags & IFF_UP)) {
2278 struct in_ifaddr * ifa;
2279
2280 int flag = scope;
2281
2282 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2283 int plen;
2284
2285 addr.s6_addr32[3] = ifa->ifa_local;
2286
2287 if (ifa->ifa_scope == RT_SCOPE_LINK)
2288 continue;
2289 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2290 if (idev->dev->flags&IFF_POINTOPOINT)
2291 continue;
2292 flag |= IFA_HOST;
2293 }
2294 if (idev->dev->flags&IFF_POINTOPOINT)
2295 plen = 64;
2296 else
2297 plen = 96;
2298
b5f348e5 2299 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2300 }
2301 }
1ab1457c 2302 }
1da177e4 2303}
0be669bb 2304#endif
1da177e4
LT		 2305
2306static void init_loopback(struct net_device *dev)
2307{
2308 struct inet6_dev *idev;
1da177e4
LT		 2309
2310 /* ::1 */
2311
2312 ASSERT_RTNL();
2313
2314 if ((idev = ipv6_find_idev(dev)) == NULL) {
2315 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2316 return;
2317 }
2318
b5f348e5 2319 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2320}
2321
2322static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2323{
2324 struct inet6_ifaddr * ifp;
95c385b4
NH		 2325 u32 addr_flags = IFA_F_PERMANENT;
2326
2327#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2328 if (idev->cnf.optimistic_dad &&
702beb87 2329 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2330 addr_flags |= IFA_F_OPTIMISTIC;
2331#endif
1da177e4 2332
95c385b4
NH		 2333
2334 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2335 if (!IS_ERR(ifp)) {
46d48046 2336 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2337 addrconf_dad_start(ifp, 0);
2338 in6_ifa_put(ifp);
2339 }
2340}
2341
2342static void addrconf_dev_config(struct net_device *dev)
2343{
2344 struct in6_addr addr;
2345 struct inet6_dev * idev;
2346
2347 ASSERT_RTNL();
2348
74235a25
HX		 2349 if ((dev->type != ARPHRD_ETHER) &&
2350 (dev->type != ARPHRD_FDDI) &&
2351 (dev->type != ARPHRD_IEEE802_TR) &&
2352 (dev->type != ARPHRD_ARCNET) &&
2353 (dev->type != ARPHRD_INFINIBAND)) {
2354 /* Alas, we support only Ethernet autoconfiguration. */
2355 return;
2356 }
2357
1da177e4
LT		 2358 idev = addrconf_add_dev(dev);
2359 if (idev == NULL)
2360 return;
2361
2362 memset(&addr, 0, sizeof(struct in6_addr));
2363 addr.s6_addr32[0] = htonl(0xFE800000);
2364
2365 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2366 addrconf_add_linklocal(idev, &addr);
2367}
2368
0be669bb 2369#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2370static void addrconf_sit_config(struct net_device *dev)
2371{
2372 struct inet6_dev *idev;
2373
2374 ASSERT_RTNL();
2375
1ab1457c
YH		 2376 /*
2377 * Configure the tunnel with one of our IPv4
2378 * addresses... we should configure all of
1da177e4
LT		 2379 * our v4 addrs in the tunnel
2380 */
2381
2382 if ((idev = ipv6_find_idev(dev)) == NULL) {
2383 printk(KERN_DEBUG "init sit: add_dev failed\n");
2384 return;
2385 }
2386
c7dc89c0
FT		 2387 if (dev->priv_flags & IFF_ISATAP) {
2388 struct in6_addr addr;
2389
2390 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2391 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2392 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2393 addrconf_add_linklocal(idev, &addr);
2394 return;
2395 }
2396
1da177e4
LT		 2397 sit_add_v4_addrs(idev);
2398
2399 if (dev->flags&IFF_POINTOPOINT) {
2400 addrconf_add_mroute(dev);
2401 addrconf_add_lroute(dev);
2402 } else
2403 sit_route_add(dev);
2404}
0be669bb 2405#endif
1da177e4
LT		 2406
2407static inline int
2408ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2409{
2410 struct in6_addr lladdr;
2411
95c385b4 2412 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2413 addrconf_add_linklocal(idev, &lladdr);
2414 return 0;
2415 }
2416 return -1;
2417}
2418
2419static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2420{
2421 struct net_device *link_dev;
c346dca1 2422 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2423
2424 /* first try to inherit the link-local address from the link device */
2425 if (idev->dev->iflink &&
6fda7350 2426 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2427 if (!ipv6_inherit_linklocal(idev, link_dev))
2428 return;
2429 }
2430 /* then try to inherit it from any device */
6fda7350 2431 for_each_netdev(net, link_dev) {
1da177e4
LT		 2432 if (!ipv6_inherit_linklocal(idev, link_dev))
2433 return;
2434 }
2435 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2436}
2437
2438/*
2439 * Autoconfigure tunnel with a link-local address so routing protocols,
2440 * DHCPv6, MLD etc. can be run over the virtual link
2441 */
2442
2443static void addrconf_ip6_tnl_config(struct net_device *dev)
2444{
2445 struct inet6_dev *idev;
2446
2447 ASSERT_RTNL();
2448
2449 if ((idev = addrconf_add_dev(dev)) == NULL) {
2450 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2451 return;
2452 }
2453 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2454}
2455
1ab1457c 2456static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2457 void * data)
2458{
2459 struct net_device *dev = (struct net_device *) data;
74235a25 2460 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2461 int run_pending = 0;
b217d616 2462 int err;
1da177e4
LT		 2463
2464 switch(event) {
45ba9dd2 2465 case NETDEV_REGISTER:
74235a25 2466 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2467 idev = ipv6_add_dev(dev);
2468 if (!idev)
b217d616 2469 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2470 }
2471 break;
1da177e4 2472 case NETDEV_UP:
3c21edbd 2473 case NETDEV_CHANGE:
c2edacf8
JV		 2474 if (dev->flags & IFF_SLAVE)
2475 break;
2476
3c21edbd 2477 if (event == NETDEV_UP) {
f24e3d65 2478 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2479 /* device is not ready yet. */
2480 printk(KERN_INFO
2481 "ADDRCONF(NETDEV_UP): %s: "
2482 "link is not ready\n",
2483 dev->name);
2484 break;
2485 }
99081049 2486
d31c7b8f
EP		 2487 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2488 idev = ipv6_add_dev(dev);
2489
e3ec6cfc 2490 if (idev) {
99081049 2491 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2492 run_pending = 1;
2493 }
3c21edbd 2494 } else {
f24e3d65 2495 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2496 /* device is still not ready. */
2497 break;
2498 }
2499
2500 if (idev) {
2501 if (idev->if_flags & IF_READY) {
2502 /* device is already configured. */
2503 break;
2504 }
2505 idev->if_flags |= IF_READY;
2506 }
2507
2508 printk(KERN_INFO
2509 "ADDRCONF(NETDEV_CHANGE): %s: "
2510 "link becomes ready\n",
2511 dev->name);
2512
c5e33bdd 2513 run_pending = 1;
3c21edbd
YH		 2514 }
2515
1da177e4 2516 switch(dev->type) {
0be669bb 2517#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2518 case ARPHRD_SIT:
2519 addrconf_sit_config(dev);
2520 break;
0be669bb 2521#endif
1da177e4
LT		 2522 case ARPHRD_TUNNEL6:
2523 addrconf_ip6_tnl_config(dev);
2524 break;
2525 case ARPHRD_LOOPBACK:
2526 init_loopback(dev);
2527 break;
2528
2529 default:
2530 addrconf_dev_config(dev);
2531 break;
3ff50b79 2532 }
1da177e4 2533 if (idev) {
c5e33bdd
YH		 2534 if (run_pending)
2535 addrconf_dad_run(idev);
2536
1da177e4
LT		 2537 /* If the MTU changed during the interface down, when the
2538 interface up, the changed MTU must be reflected in the
2539 idev as well as routers.
2540 */
2541 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2542 rt6_mtu_change(dev, dev->mtu);
2543 idev->cnf.mtu6 = dev->mtu;
2544 }
2545 idev->tstamp = jiffies;
2546 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2547 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2548 stop IPv6 on this interface.
2549 */
2550 if (dev->mtu < IPV6_MIN_MTU)
2551 addrconf_ifdown(dev, event != NETDEV_DOWN);
2552 }
2553 break;
2554
2555 case NETDEV_CHANGEMTU:
d31c7b8f 2556 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2557 rt6_mtu_change(dev, dev->mtu);
2558 idev->cnf.mtu6 = dev->mtu;
2559 break;
2560 }
2561
d31c7b8f
EP		 2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2563 idev = ipv6_add_dev(dev);
2564 if (idev)
2565 break;
2566 }
2567
1da177e4
LT		 2568 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2569
2570 case NETDEV_DOWN:
2571 case NETDEV_UNREGISTER:
2572 /*
2573 * Remove all addresses from this interface.
2574 */
2575 addrconf_ifdown(dev, event != NETDEV_DOWN);
2576 break;
3c21edbd 2577
1da177e4 2578 case NETDEV_CHANGENAME:
1da177e4 2579 if (idev) {
5632c515 2580 snmp6_unregister_dev(idev);
408c4768 2581 addrconf_sysctl_unregister(idev);
f52295a9 2582 addrconf_sysctl_register(idev);
b217d616
HX		 2583 err = snmp6_register_dev(idev);
2584 if (err)
2585 return notifier_from_errno(err);
5632c515 2586 }
1da177e4 2587 break;
75c78500
MS		 2588 case NETDEV_BONDING_OLDTYPE:
2589 case NETDEV_BONDING_NEWTYPE:
2590 addrconf_bonding_change(dev, event);
2591 break;
3ff50b79 2592 }
1da177e4
LT		 2593
2594 return NOTIFY_OK;
2595}
2596
2597/*
2598 * addrconf module should be notified of a device going up
2599 */
2600static struct notifier_block ipv6_dev_notf = {
2601 .notifier_call = addrconf_notify,
2602 .priority = 0
2603};
2604
75c78500
MS		 2605static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2606{
2607 struct inet6_dev *idev;
2608 ASSERT_RTNL();
2609
2610 idev = __in6_dev_get(dev);
2611
2612 if (event == NETDEV_BONDING_NEWTYPE)
2613 ipv6_mc_remap(idev);
2614 else if (event == NETDEV_BONDING_OLDTYPE)
2615 ipv6_mc_unmap(idev);
2616}
2617
1da177e4
LT		 2618static int addrconf_ifdown(struct net_device *dev, int how)
2619{
2620 struct inet6_dev *idev;
8f37ada5 2621 struct inet6_ifaddr *ifa, *keep_list, **bifa;
c346dca1 2622 struct net *net = dev_net(dev);
1da177e4
LT		 2623 int i;
2624
2625 ASSERT_RTNL();
2626
f3db4851 2627 rt6_ifdown(net, dev);
1da177e4
LT		 2628 neigh_ifdown(&nd_tbl, dev);
2629
2630 idev = __in6_dev_get(dev);
2631 if (idev == NULL)
2632 return -ENODEV;
2633
2634 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2635 Do not dev_put!
1da177e4 2636 */
439e2385 2637 if (how) {
1da177e4 2638 idev->dead = 1;
8814c4b5
YH		 2639
2640 /* protected by rtnl_lock */
2641 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2642
2643 /* Step 1.5: remove snmp6 entry */
2644 snmp6_unregister_dev(idev);
2645
2646 }
2647
2648 /* Step 2: clear hash table */
2649 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2650 bifa = &inet6_addr_lst[i];
2651
2652 write_lock_bh(&addrconf_hash_lock);
2653 while ((ifa = *bifa) != NULL) {
dc2b99f7 2654 if (ifa->idev == idev &&
84e8b803 2655 (how || !(ifa->flags&IFA_F_PERMANENT) ||
2656 ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2657 *bifa = ifa->lst_next;
2658 ifa->lst_next = NULL;
84e8b803 2659 __in6_ifa_put(ifa);
1da177e4
LT		 2660 continue;
2661 }
2662 bifa = &ifa->lst_next;
2663 }
2664 write_unlock_bh(&addrconf_hash_lock);
2665 }
2666
2667 write_lock_bh(&idev->lock);
2668
2669 /* Step 3: clear flags for stateless addrconf */
439e2385 2670 if (!how)
3c21edbd 2671 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2672
2673 /* Step 4: clear address list */
2674#ifdef CONFIG_IPV6_PRIVACY
439e2385 2675 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2676 in6_dev_put(idev);
2677
2678 /* clear tempaddr list */
2679 while ((ifa = idev->tempaddr_list) != NULL) {
2680 idev->tempaddr_list = ifa->tmp_next;
2681 ifa->tmp_next = NULL;
2682 ifa->dead = 1;
2683 write_unlock_bh(&idev->lock);
2684 spin_lock_bh(&ifa->lock);
2685
2686 if (ifa->ifpub) {
2687 in6_ifa_put(ifa->ifpub);
2688 ifa->ifpub = NULL;
2689 }
2690 spin_unlock_bh(&ifa->lock);
2691 in6_ifa_put(ifa);
2692 write_lock_bh(&idev->lock);
2693 }
2694#endif
8f37ada5 2695 keep_list = NULL;
2696 bifa = &keep_list;
2697 while ((ifa = idev->addr_list) != NULL) {
2698 idev->addr_list = ifa->if_next;
2699 ifa->if_next = NULL;
2700
84e8b803 2701 addrconf_del_timer(ifa);
2702
2703 /* If just doing link down, and address is permanent
2704 and not link-local, then retain it. */
2705 if (how == 0 &&
2706 (ifa->flags&IFA_F_PERMANENT) &&
2707 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
8f37ada5 2708
2709 /* Move to holding list */
2710 *bifa = ifa;
dc2b99f7 2711 bifa = &ifa->if_next;
2712
84e8b803 2713 /* If not doing DAD on this address, just keep it. */
2714 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2715 idev->cnf.accept_dad <= 0 ||
2716 (ifa->flags & IFA_F_NODAD))
2717 continue;
2718
2719 /* If it was tentative already, no need to notify */
2720 if (ifa->flags & IFA_F_TENTATIVE)
2721 continue;
2722
2723 /* Flag it for later restoration when link comes up */
2724 ifa->flags |= IFA_F_TENTATIVE;
2725 in6_ifa_hold(ifa);
dc2b99f7 2726 } else {
dc2b99f7 2727 ifa->dead = 1;
84e8b803 2728 }
2729 write_unlock_bh(&idev->lock);
1da177e4 2730
84e8b803 2731 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2733 in6_ifa_put(ifa);
dc2b99f7 2734
84e8b803 2735 write_lock_bh(&idev->lock);
1da177e4 2736 }
8f37ada5 2737
2738 idev->addr_list = keep_list;
2739
1da177e4
LT		 2740 write_unlock_bh(&idev->lock);
2741
2742 /* Step 5: Discard multicast list */
2743
439e2385 2744 if (how)
1da177e4
LT		 2745 ipv6_mc_destroy_dev(idev);
2746 else
2747 ipv6_mc_down(idev);
2748
1da177e4 2749 idev->tstamp = jiffies;
1ab1457c 2750
1da177e4
LT		 2751 /* Shot the device (if unregistered) */
2752
439e2385 2753 if (how) {
408c4768 2754 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2755 neigh_parms_release(&nd_tbl, idev->nd_parms);
2756 neigh_ifdown(&nd_tbl, dev);
2757 in6_dev_put(idev);
2758 }
2759 return 0;
2760}
2761
2762static void addrconf_rs_timer(unsigned long data)
2763{
2764 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2765 struct inet6_dev *idev = ifp->idev;
1da177e4 2766
5b2a1953 2767 read_lock(&idev->lock);
2768 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2769 goto out;
2770
5b2a1953 2771 if (idev->cnf.forwarding)
2772 goto out;
2773
2774 /* Announcement received after solicitation was sent */
2775 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2776 goto out;
1da177e4
LT		 2777
2778 spin_lock(&ifp->lock);
5b2a1953 2779 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2780 /* The wait after the last probe can be shorter */
2781 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2782 (ifp->probes == idev->cnf.rtr_solicits) ?
2783 idev->cnf.rtr_solicit_delay :
2784 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2785 spin_unlock(&ifp->lock);
2786
5b2a1953 2787 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2788 } else {
2789 spin_unlock(&ifp->lock);
2790 /*
2791 * Note: we do not support deprecated "all on-link"
2792 * assumption any longer.
2793 */
2794 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2795 idev->dev->name);
1da177e4
LT		 2796 }
2797
2798out:
5b2a1953 2799 read_unlock(&idev->lock);
1da177e4
LT		 2800 in6_ifa_put(ifp);
2801}
2802
2803/*
2804 * Duplicate Address Detection
2805 */
3c21edbd
YH		 2806static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2807{
2808 unsigned long rand_num;
2809 struct inet6_dev *idev = ifp->idev;
2810
95c385b4
NH		 2811 if (ifp->flags & IFA_F_OPTIMISTIC)
2812 rand_num = 0;
2813 else
2814 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2815
3c21edbd
YH		 2816 ifp->probes = idev->cnf.dad_transmits;
2817 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2818}
2819
e431b8c0 2820static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2821{
2822 struct inet6_dev *idev = ifp->idev;
2823 struct net_device *dev = idev->dev;
1da177e4
LT		 2824
2825 addrconf_join_solict(dev, &ifp->addr);
2826
1da177e4 2827 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2828
2829 read_lock_bh(&idev->lock);
2830 if (ifp->dead)
2831 goto out;
1da177e4 2832
21809faf 2833 spin_lock(&ifp->lock);
1da177e4 2834 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2835 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2836 !(ifp->flags&IFA_F_TENTATIVE) ||
2837 ifp->flags & IFA_F_NODAD) {
cc411d0b 2838 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2839 spin_unlock(&ifp->lock);
1da177e4
LT		 2840 read_unlock_bh(&idev->lock);
2841
2842 addrconf_dad_completed(ifp);
2843 return;
2844 }
2845
6732bade 2846 if (!(idev->if_flags & IF_READY)) {
21809faf 2847 spin_unlock(&ifp->lock);
6732bade 2848 read_unlock_bh(&idev->lock);
3c21edbd 2849 /*
590a9887 2850 * If the device is not ready:
3c21edbd
YH		 2851 * - keep it tentative if it is a permanent address.
2852 * - otherwise, kill it.
2853 */
2854 in6_ifa_hold(ifp);
cc411d0b 2855 addrconf_dad_stop(ifp, 0);
6732bade 2856 return;
3c21edbd 2857 }
95c385b4
NH		 2858
2859 /*
2860 * Optimistic nodes can start receiving
2861 * Frames right away
2862 */
2863 if(ifp->flags & IFA_F_OPTIMISTIC)
2864 ip6_ins_rt(ifp->rt);
2865
6732bade 2866 addrconf_dad_kick(ifp);
21809faf 2867 spin_unlock(&ifp->lock);
1da177e4
LT		 2868out:
2869 read_unlock_bh(&idev->lock);
2870}
2871
2872static void addrconf_dad_timer(unsigned long data)
2873{
2874 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2875 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2876 struct in6_addr mcaddr;
2877
122e4519 2878 read_lock(&idev->lock);
2879 if (idev->dead || !(idev->if_flags & IF_READY)) {
2880 read_unlock(&idev->lock);
1da177e4
LT		 2881 goto out;
2882 }
21809faf 2883
2884 spin_lock(&ifp->lock);
1da177e4
LT		 2885 if (ifp->probes == 0) {
2886 /*
2887 * DAD was successful
2888 */
2889
cc411d0b 2890 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2891 spin_unlock(&ifp->lock);
122e4519 2892 read_unlock(&idev->lock);
1da177e4
LT		 2893
2894 addrconf_dad_completed(ifp);
2895
2896 goto out;
2897 }
2898
2899 ifp->probes--;
2900 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2901 spin_unlock(&ifp->lock);
122e4519 2902 read_unlock(&idev->lock);
1da177e4
LT		 2903
2904 /* send a neighbour solicitation for our addr */
1da177e4 2905 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2906 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2907out:
2908 in6_ifa_put(ifp);
2909}
2910
2911static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2912{
2913 struct net_device * dev = ifp->idev->dev;
2914
2915 /*
2916 * Configure the address for reception. Now it is valid.
2917 */
2918
2919 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2920
2921 /* If added prefix is link local and forwarding is off,
2922 start sending router solicitations.
2923 */
2924
2925 if (ifp->idev->cnf.forwarding == 0 &&
2926 ifp->idev->cnf.rtr_solicits > 0 &&
2927 (dev->flags&IFF_LOOPBACK) == 0 &&
2928 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2929 /*
2930 * If a host as already performed a random delay
2931 * [...] as part of DAD [...] there is no need
2932 * to delay again before sending the first RS
2933 */
f3ee4010 2934 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2935
2936 spin_lock_bh(&ifp->lock);
2937 ifp->probes = 1;
2938 ifp->idev->if_flags |= IF_RS_SENT;
2939 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2940 spin_unlock_bh(&ifp->lock);
2941 }
2942}
2943
c5e33bdd
YH		 2944static void addrconf_dad_run(struct inet6_dev *idev) {
2945 struct inet6_ifaddr *ifp;
2946
2947 read_lock_bh(&idev->lock);
2948 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
21809faf 2949 spin_lock(&ifp->lock);
c5e33bdd 2950 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2951 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2952 continue;
2953 }
21809faf 2954 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2955 addrconf_dad_kick(ifp);
2956 }
2957 read_unlock_bh(&idev->lock);
2958}
2959
1da177e4
LT		 2960#ifdef CONFIG_PROC_FS
2961struct if6_iter_state {
3c40090a 2962 struct seq_net_private p;
1da177e4
LT		 2963 int bucket;
2964};
2965
2966static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2967{
2968 struct inet6_ifaddr *ifa = NULL;
2969 struct if6_iter_state *state = seq->private;
1218854a 2970 struct net *net = seq_file_net(seq);
1da177e4
LT		 2971
2972 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2973 ifa = inet6_addr_lst[state->bucket];
3c40090a 2974
878628fb 2975 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
3c40090a 2976 ifa = ifa->lst_next;
1da177e4
LT		 2977 if (ifa)
2978 break;
2979 }
2980 return ifa;
2981}
2982
2983static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2984{
2985 struct if6_iter_state *state = seq->private;
1218854a 2986 struct net *net = seq_file_net(seq);
1da177e4
LT		 2987
2988 ifa = ifa->lst_next;
2989try_again:
3c40090a 2990 if (ifa) {
878628fb 2991 if (!net_eq(dev_net(ifa->idev->dev), net)) {
3c40090a
DL		 2992 ifa = ifa->lst_next;
2993 goto try_again;
2994 }
2995 }
2996
1da177e4
LT		 2997 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2998 ifa = inet6_addr_lst[state->bucket];
2999 goto try_again;
3000 }
3c40090a 3001
1da177e4
LT		 3002 return ifa;
3003}
3004
3005static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3006{
3007 struct inet6_ifaddr *ifa = if6_get_first(seq);
3008
3009 if (ifa)
3010 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3011 --pos;
3012 return pos ? NULL : ifa;
3013}
3014
3015static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 3016 __acquires(addrconf_hash_lock)
1da177e4
LT		 3017{
3018 read_lock_bh(&addrconf_hash_lock);
3019 return if6_get_idx(seq, *pos);
3020}
3021
3022static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3023{
3024 struct inet6_ifaddr *ifa;
3025
3026 ifa = if6_get_next(seq, v);
3027 ++*pos;
3028 return ifa;
3029}
3030
3031static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 3032 __releases(addrconf_hash_lock)
1da177e4
LT		 3033{
3034 read_unlock_bh(&addrconf_hash_lock);
3035}
3036
3037static int if6_seq_show(struct seq_file *seq, void *v)
3038{
3039 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3040 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3041 &ifp->addr,
1da177e4
LT		 3042 ifp->idev->dev->ifindex,
3043 ifp->prefix_len,
3044 ifp->scope,
3045 ifp->flags,
3046 ifp->idev->dev->name);
3047 return 0;
3048}
3049
56b3d975 3050static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3051 .start = if6_seq_start,
3052 .next = if6_seq_next,
3053 .show = if6_seq_show,
3054 .stop = if6_seq_stop,
3055};
3056
3057static int if6_seq_open(struct inode *inode, struct file *file)
3058{
3c40090a
DL		 3059 return seq_open_net(inode, file, &if6_seq_ops,
3060 sizeof(struct if6_iter_state));
1da177e4
LT		 3061}
3062
9a32144e 3063static const struct file_operations if6_fops = {
1da177e4
LT		 3064 .owner = THIS_MODULE,
3065 .open = if6_seq_open,
3066 .read = seq_read,
3067 .llseek = seq_lseek,
3c40090a 3068 .release = seq_release_net,
1da177e4
LT		 3069};
3070
2c8c1e72 3071static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3072{
3c40090a 3073 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3074 return -ENOMEM;
3075 return 0;
3076}
3077
2c8c1e72 3078static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3079{
3080 proc_net_remove(net, "if_inet6");
3081}
3082
3083static struct pernet_operations if6_proc_net_ops = {
3084 .init = if6_proc_net_init,
3085 .exit = if6_proc_net_exit,
3086};
3087
3088int __init if6_proc_init(void)
3089{
3090 return register_pernet_subsys(&if6_proc_net_ops);
3091}
3092
1da177e4
LT		 3093void if6_proc_exit(void)
3094{
3c40090a 3095 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3096}
3097#endif /* CONFIG_PROC_FS */
3098
59fbb3a6 3099#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3100/* Check if address is a home address configured on any interface. */
389f6612 3101int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3102{
3103 int ret = 0;
3104 struct inet6_ifaddr * ifp;
3105 u8 hash = ipv6_addr_hash(addr);
3106 read_lock_bh(&addrconf_hash_lock);
3107 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
878628fb 3108 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3109 continue;
caad295f 3110 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3111 (ifp->flags & IFA_F_HOMEADDRESS)) {
3112 ret = 1;
3113 break;
3114 }
3115 }
3116 read_unlock_bh(&addrconf_hash_lock);
3117 return ret;
3118}
3119#endif
3120
1da177e4
LT		 3121/*
3122 * Periodic address status verification
3123 */
3124
3125static void addrconf_verify(unsigned long foo)
3126{
3127 struct inet6_ifaddr *ifp;
3128 unsigned long now, next;
3129 int i;
3130
3131 spin_lock_bh(&addrconf_verify_lock);
3132 now = jiffies;
3133 next = now + ADDR_CHECK_FREQUENCY;
3134
3135 del_timer(&addr_chk_timer);
3136
3137 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3138
3139restart:
5d5780df 3140 read_lock(&addrconf_hash_lock);
1da177e4
LT		 3141 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3142 unsigned long age;
3143#ifdef CONFIG_IPV6_PRIVACY
3144 unsigned long regen_advance;
3145#endif
3146
3147 if (ifp->flags & IFA_F_PERMANENT)
3148 continue;
3149
3150 spin_lock(&ifp->lock);
3151 age = (now - ifp->tstamp) / HZ;
3152
3153#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 3154 regen_advance = ifp->idev->cnf.regen_max_retry *
3155 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 3156 ifp->idev->nd_parms->retrans_time / HZ;
3157#endif
3158
8f27ebb9
YH		 3159 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3160 age >= ifp->valid_lft) {
1da177e4
LT		 3161 spin_unlock(&ifp->lock);
3162 in6_ifa_hold(ifp);
5d5780df 3163 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3164 ipv6_del_addr(ifp);
3165 goto restart;
8f27ebb9
YH		 3166 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3167 spin_unlock(&ifp->lock);
3168 continue;
1da177e4 3169 } else if (age >= ifp->prefered_lft) {
a1ed0526 3170 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3171 int deprecate = 0;
3172
3173 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3174 deprecate = 1;
3175 ifp->flags |= IFA_F_DEPRECATED;
3176 }
3177
3178 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3179 next = ifp->tstamp + ifp->valid_lft * HZ;
3180
3181 spin_unlock(&ifp->lock);
3182
3183 if (deprecate) {
3184 in6_ifa_hold(ifp);
5d5780df 3185 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3186
3187 ipv6_ifa_notify(0, ifp);
3188 in6_ifa_put(ifp);
3189 goto restart;
3190 }
3191#ifdef CONFIG_IPV6_PRIVACY
3192 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3193 !(ifp->flags&IFA_F_TENTATIVE)) {
3194 if (age >= ifp->prefered_lft - regen_advance) {
3195 struct inet6_ifaddr *ifpub = ifp->ifpub;
3196 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3197 next = ifp->tstamp + ifp->prefered_lft * HZ;
3198 if (!ifp->regen_count && ifpub) {
3199 ifp->regen_count++;
3200 in6_ifa_hold(ifp);
3201 in6_ifa_hold(ifpub);
3202 spin_unlock(&ifp->lock);
5d5780df 3203 read_unlock(&addrconf_hash_lock);
291d809b
HY		 3204 spin_lock(&ifpub->lock);
3205 ifpub->regen_count = 0;
3206 spin_unlock(&ifpub->lock);
1da177e4
LT		 3207 ipv6_create_tempaddr(ifpub, ifp);
3208 in6_ifa_put(ifpub);
3209 in6_ifa_put(ifp);
3210 goto restart;
3211 }
3212 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3213 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3214 spin_unlock(&ifp->lock);
3215#endif
3216 } else {
3217 /* ifp->prefered_lft <= ifp->valid_lft */
3218 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3219 next = ifp->tstamp + ifp->prefered_lft * HZ;
3220 spin_unlock(&ifp->lock);
3221 }
3222 }
5d5780df 3223 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3224 }
3225
3226 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3227 add_timer(&addr_chk_timer);
3228 spin_unlock_bh(&addrconf_verify_lock);
3229}
3230
461d8837
TG		 3231static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3232{
3233 struct in6_addr *pfx = NULL;
3234
3235 if (addr)
3236 pfx = nla_data(addr);
3237
3238 if (local) {
3239 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3240 pfx = NULL;
3241 else
3242 pfx = nla_data(local);
3243 }
3244
3245 return pfx;
3246}
3247
ef7c79ed 3248static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3249 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3250 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3251 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3252};
3253
1da177e4
LT		 3254static int
3255inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3256{
3b1e0a65 3257 struct net *net = sock_net(skb->sk);
b933f716
TG		 3258 struct ifaddrmsg *ifm;
3259 struct nlattr *tb[IFA_MAX+1];
1da177e4 3260 struct in6_addr *pfx;
b933f716 3261 int err;
1da177e4 3262
b933f716
TG		 3263 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3264 if (err < 0)
3265 return err;
3266
3267 ifm = nlmsg_data(nlh);
3268 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3269 if (pfx == NULL)
3270 return -EINVAL;
3271
af284937 3272 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3273}
3274
55ebaef1
NT		 3275static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3276 u32 prefered_lft, u32 valid_lft)
081bba5b 3277{
6f704992
YH		 3278 u32 flags;
3279 clock_t expires;
4bed72e4 3280 unsigned long timeout;
46d48046 3281
081bba5b
NT		 3282 if (!valid_lft || (prefered_lft > valid_lft))
3283 return -EINVAL;
3284
4bed72e4
YH		 3285 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3286 if (addrconf_finite_timeout(timeout)) {
3287 expires = jiffies_to_clock_t(timeout * HZ);
3288 valid_lft = timeout;
6f704992 3289 flags = RTF_EXPIRES;
4bed72e4
YH		 3290 } else {
3291 expires = 0;
3292 flags = 0;
3293 ifa_flags |= IFA_F_PERMANENT;
6f704992 3294 }
081bba5b 3295
4bed72e4
YH		 3296 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3297 if (addrconf_finite_timeout(timeout)) {
3298 if (timeout == 0)
3299 ifa_flags |= IFA_F_DEPRECATED;
3300 prefered_lft = timeout;
3301 }
081bba5b
NT		 3302
3303 spin_lock_bh(&ifp->lock);
3b9f9a1c 3304 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3305 ifp->tstamp = jiffies;
3306 ifp->valid_lft = valid_lft;
3307 ifp->prefered_lft = prefered_lft;
3308
3309 spin_unlock_bh(&ifp->lock);
3310 if (!(ifp->flags&IFA_F_TENTATIVE))
3311 ipv6_ifa_notify(0, ifp);
081bba5b 3312
46d48046 3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3314 expires, flags);
081bba5b
NT		 3315 addrconf_verify(0);
3316
3317 return 0;
3318}
3319
1da177e4
LT		 3320static int
3321inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3322{
3b1e0a65 3323 struct net *net = sock_net(skb->sk);
461d8837
TG		 3324 struct ifaddrmsg *ifm;
3325 struct nlattr *tb[IFA_MAX+1];
1da177e4 3326 struct in6_addr *pfx;
7198f8ce
TG		 3327 struct inet6_ifaddr *ifa;
3328 struct net_device *dev;
55ebaef1
NT		 3329 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3330 u8 ifa_flags;
461d8837 3331 int err;
1da177e4 3332
461d8837
TG		 3333 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3334 if (err < 0)
3335 return err;
3336
3337 ifm = nlmsg_data(nlh);
3338 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3339 if (pfx == NULL)
3340 return -EINVAL;
3341
461d8837 3342 if (tb[IFA_CACHEINFO]) {
0778769d 3343 struct ifa_cacheinfo *ci;
461d8837
TG		 3344
3345 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3346 valid_lft = ci->ifa_valid;
461d8837
TG		 3347 preferred_lft = ci->ifa_prefered;
3348 } else {
3349 preferred_lft = INFINITY_LIFE_TIME;
3350 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3351 }
3352
af284937 3353 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3354 if (dev == NULL)
3355 return -ENODEV;
3356
55ebaef1 3357 /* We ignore other flags so far. */
3b9f9a1c 3358 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3359
1cab3da6 3360 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3361 if (ifa == NULL) {
3362 /*
3363 * It would be best to check for !NLM_F_CREATE here but
3364 * userspace alreay relies on not having to provide this.
3365 */
af284937
DL		 3366 return inet6_addr_add(net, ifm->ifa_index, pfx,
3367 ifm->ifa_prefixlen, ifa_flags,
3368 preferred_lft, valid_lft);
081bba5b
NT		 3369 }
3370
7198f8ce
TG		 3371 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3372 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3373 err = -EEXIST;
3374 else
55ebaef1 3375 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3376
3377 in6_ifa_put(ifa);
3378
3379 return err;
1da177e4
LT		 3380}
3381
101bb229
TG		 3382static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3383 u8 scope, int ifindex)
3384{
3385 struct ifaddrmsg *ifm;
3386
3387 ifm = nlmsg_data(nlh);
3388 ifm->ifa_family = AF_INET6;
3389 ifm->ifa_prefixlen = prefixlen;
3390 ifm->ifa_flags = flags;
3391 ifm->ifa_scope = scope;
3392 ifm->ifa_index = ifindex;
3393}
3394
85486af0
TG		 3395static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3396 unsigned long tstamp, u32 preferred, u32 valid)
3397{
3398 struct ifa_cacheinfo ci;
3399
3400 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3401 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3402 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3403 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3404 ci.ifa_prefered = preferred;
3405 ci.ifa_valid = valid;
3406
3407 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3408}
3409
101bb229
TG		 3410static inline int rt_scope(int ifa_scope)
3411{
3412 if (ifa_scope & IFA_HOST)
3413 return RT_SCOPE_HOST;
3414 else if (ifa_scope & IFA_LINK)
3415 return RT_SCOPE_LINK;
3416 else if (ifa_scope & IFA_SITE)
3417 return RT_SCOPE_SITE;
3418 else
3419 return RT_SCOPE_UNIVERSE;
3420}
3421
0ab6803b
TG		 3422static inline int inet6_ifaddr_msgsize(void)
3423{
339bf98f
TG		 3424 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3425 + nla_total_size(16) /* IFA_ADDRESS */
3426 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3427}
c5396a31 3428
1da177e4 3429static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3430 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3431{
1da177e4 3432 struct nlmsghdr *nlh;
85486af0 3433 u32 preferred, valid;
1da177e4 3434
0ab6803b
TG		 3435 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3436 if (nlh == NULL)
26932566 3437 return -EMSGSIZE;
0ab6803b 3438
101bb229
TG		 3439 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3440 ifa->idev->dev->ifindex);
3441
1da177e4 3442 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3443 preferred = ifa->prefered_lft;
3444 valid = ifa->valid_lft;
3445 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3446 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3447 if (preferred > tval)
3448 preferred -= tval;
3449 else
3450 preferred = 0;
85486af0
TG		 3451 if (valid != INFINITY_LIFE_TIME)
3452 valid -= tval;
1da177e4
LT		 3453 }
3454 } else {
85486af0
TG		 3455 preferred = INFINITY_LIFE_TIME;
3456 valid = INFINITY_LIFE_TIME;
3457 }
3458
0ab6803b 3459 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3460 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3461 nlmsg_cancel(skb, nlh);
3462 return -EMSGSIZE;
3463 }
1da177e4 3464
0ab6803b 3465 return nlmsg_end(skb, nlh);
1da177e4
LT		 3466}
3467
3468static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3469 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3470{
1da177e4 3471 struct nlmsghdr *nlh;
101bb229
TG		 3472 u8 scope = RT_SCOPE_UNIVERSE;
3473 int ifindex = ifmca->idev->dev->ifindex;
3474
3475 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3476 scope = RT_SCOPE_SITE;
1da177e4 3477
0ab6803b
TG		 3478 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3479 if (nlh == NULL)
26932566 3480 return -EMSGSIZE;
85486af0 3481
0ab6803b
TG		 3482 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3483 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3484 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3485 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3486 nlmsg_cancel(skb, nlh);
3487 return -EMSGSIZE;
3488 }
85486af0 3489
0ab6803b 3490 return nlmsg_end(skb, nlh);
1da177e4
LT		 3491}
3492
3493static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3494 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3495{
1da177e4 3496 struct nlmsghdr *nlh;
101bb229
TG		 3497 u8 scope = RT_SCOPE_UNIVERSE;
3498 int ifindex = ifaca->aca_idev->dev->ifindex;
3499
3500 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3501 scope = RT_SCOPE_SITE;
1da177e4 3502
0ab6803b
TG		 3503 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3504 if (nlh == NULL)
26932566 3505 return -EMSGSIZE;
85486af0 3506
0ab6803b
TG		 3507 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3508 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3509 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3510 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3511 nlmsg_cancel(skb, nlh);
3512 return -EMSGSIZE;
3513 }
1da177e4 3514
0ab6803b 3515 return nlmsg_end(skb, nlh);
1da177e4
LT		 3516}
3517
3518enum addr_type_t
3519{
3520 UNICAST_ADDR,
3521 MULTICAST_ADDR,
3522 ANYCAST_ADDR,
3523};
3524
234b27c3
ED		 3525/* called with rcu_read_lock() */
3526static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3527 struct netlink_callback *cb, enum addr_type_t type,
3528 int s_ip_idx, int *p_ip_idx)
3529{
3530 struct inet6_ifaddr *ifa;
3531 struct ifmcaddr6 *ifmca;
3532 struct ifacaddr6 *ifaca;
3533 int err = 1;
3534 int ip_idx = *p_ip_idx;
3535
3536 read_lock_bh(&idev->lock);
3537 switch (type) {
3538 case UNICAST_ADDR:
3539 /* unicast address incl. temp addr */
3540 for (ifa = idev->addr_list; ifa;
3541 ifa = ifa->if_next, ip_idx++) {
3542 if (ip_idx < s_ip_idx)
3543 continue;
3544 err = inet6_fill_ifaddr(skb, ifa,
3545 NETLINK_CB(cb->skb).pid,
3546 cb->nlh->nlmsg_seq,
3547 RTM_NEWADDR,
3548 NLM_F_MULTI);
3549 if (err <= 0)
3550 break;
3551 }
3552 break;
3553 case MULTICAST_ADDR:
3554 /* multicast address */
3555 for (ifmca = idev->mc_list; ifmca;
3556 ifmca = ifmca->next, ip_idx++) {
3557 if (ip_idx < s_ip_idx)
3558 continue;
3559 err = inet6_fill_ifmcaddr(skb, ifmca,
3560 NETLINK_CB(cb->skb).pid,
3561 cb->nlh->nlmsg_seq,
3562 RTM_GETMULTICAST,
3563 NLM_F_MULTI);
3564 if (err <= 0)
3565 break;
3566 }
3567 break;
3568 case ANYCAST_ADDR:
3569 /* anycast address */
3570 for (ifaca = idev->ac_list; ifaca;
3571 ifaca = ifaca->aca_next, ip_idx++) {
3572 if (ip_idx < s_ip_idx)
3573 continue;
3574 err = inet6_fill_ifacaddr(skb, ifaca,
3575 NETLINK_CB(cb->skb).pid,
3576 cb->nlh->nlmsg_seq,
3577 RTM_GETANYCAST,
3578 NLM_F_MULTI);
3579 if (err <= 0)
3580 break;
3581 }
3582 break;
3583 default:
3584 break;
3585 }
3586 read_unlock_bh(&idev->lock);
3587 *p_ip_idx = ip_idx;
3588 return err;
3589}
3590
1da177e4
LT		 3591static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3592 enum addr_type_t type)
3593{
234b27c3
ED		 3594 struct net *net = sock_net(skb->sk);
3595 int h, s_h;
1da177e4
LT		 3596 int idx, ip_idx;
3597 int s_idx, s_ip_idx;
1da177e4 3598 struct net_device *dev;
234b27c3
ED		 3599 struct inet6_dev *idev;
3600 struct hlist_head *head;
3601 struct hlist_node *node;
1ab1457c 3602
234b27c3
ED		 3603 s_h = cb->args[0];
3604 s_idx = idx = cb->args[1];
3605 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3606
234b27c3
ED		 3607 rcu_read_lock();
3608 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3609 idx = 0;
3610 head = &net->dev_index_head[h];
3611 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3612 if (idx < s_idx)
3613 goto cont;
4b97efdf 3614 if (h > s_h || idx > s_idx)
234b27c3
ED		 3615 s_ip_idx = 0;
3616 ip_idx = 0;
3617 if ((idev = __in6_dev_get(dev)) == NULL)
3618 goto cont;
3619
3620 if (in6_dump_addrs(idev, skb, cb, type,
3621 s_ip_idx, &ip_idx) <= 0)
3622 goto done;
7562f876 3623cont:
234b27c3
ED		 3624 idx++;
3625 }
1da177e4 3626 }
234b27c3
ED		 3627done:
3628 rcu_read_unlock();
3629 cb->args[0] = h;
3630 cb->args[1] = idx;
3631 cb->args[2] = ip_idx;
3632
1da177e4
LT		 3633 return skb->len;
3634}
3635
3636static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3637{
3638 enum addr_type_t type = UNICAST_ADDR;
b854272b 3639
1da177e4
LT		 3640 return inet6_dump_addr(skb, cb, type);
3641}
3642
3643static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3644{
3645 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3646
1da177e4
LT		 3647 return inet6_dump_addr(skb, cb, type);
3648}
3649
3650
3651static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3652{
3653 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3654
1da177e4
LT		 3655 return inet6_dump_addr(skb, cb, type);
3656}
3657
1b29fc2c
TG		 3658static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3659 void *arg)
6c223828 3660{
3b1e0a65 3661 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3662 struct ifaddrmsg *ifm;
3663 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3664 struct in6_addr *addr = NULL;
3665 struct net_device *dev = NULL;
3666 struct inet6_ifaddr *ifa;
3667 struct sk_buff *skb;
6c223828
NT		 3668 int err;
3669
1b29fc2c
TG		 3670 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3671 if (err < 0)
3672 goto errout;
3673
3674 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3675 if (addr == NULL) {
3676 err = -EINVAL;
3677 goto errout;
6c223828 3678 }
6c223828 3679
1b29fc2c 3680 ifm = nlmsg_data(nlh);
6c223828 3681 if (ifm->ifa_index)
6fda7350 3682 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3683
1cab3da6 3684 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3685 err = -EADDRNOTAVAIL;
3686 goto errout;
3687 }
6c223828 3688
0ab6803b 3689 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
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{
3814 switch(attrtype) {
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);
e0a1ad73 4050 if (ip6_del_rt(ifp->rt))
1da177e4 4051 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4052 break;
4053 }
4054}
4055
4056static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4057{
8814c4b5 4058 rcu_read_lock_bh();
1da177e4
LT		 4059 if (likely(ifp->idev->dead == 0))
4060 __ipv6_ifa_notify(event, ifp);
8814c4b5 4061 rcu_read_unlock_bh();
1da177e4
LT		 4062}
4063
4064#ifdef CONFIG_SYSCTL
4065
4066static
8d65af78 4067int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4068 void __user *buffer, size_t *lenp, loff_t *ppos)
4069{
4070 int *valp = ctl->data;
4071 int val = *valp;
88af182e 4072 loff_t pos = *ppos;
1da177e4
LT		 4073 int ret;
4074
8d65af78 4075 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4076
c8fecf22 4077 if (write)
b325fddb 4078 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4079 if (ret)
4080 *ppos = pos;
1ab1457c 4081 return ret;
1da177e4
LT		 4082}
4083
56d417b1
BH		 4084static void dev_disable_change(struct inet6_dev *idev)
4085{
4086 if (!idev || !idev->dev)
4087 return;
4088
4089 if (idev->cnf.disable_ipv6)
4090 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4091 else
4092 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4093}
4094
4095static void addrconf_disable_change(struct net *net, __s32 newf)
4096{
4097 struct net_device *dev;
4098 struct inet6_dev *idev;
4099
c6d14c84
ED		 4100 rcu_read_lock();
4101 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4102 idev = __in6_dev_get(dev);
4103 if (idev) {
4104 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4105 idev->cnf.disable_ipv6 = newf;
4106 if (changed)
4107 dev_disable_change(idev);
4108 }
56d417b1 4109 }
c6d14c84 4110 rcu_read_unlock();
56d417b1
BH		 4111}
4112
4113static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4114{
4115 struct net *net;
4116
4117 net = (struct net *)table->extra2;
4118
4119 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4120 return 0;
4121
88af182e
EB		 4122 if (!rtnl_trylock()) {
4123 /* Restore the original values before restarting */
4124 *p = old;
56d417b1 4125 return restart_syscall();
88af182e 4126 }
56d417b1
BH		 4127
4128 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4129 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4130 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4131 addrconf_disable_change(net, newf);
4132 } else if ((!*p) ^ (!old))
4133 dev_disable_change((struct inet6_dev *)table->extra1);
4134
4135 rtnl_unlock();
4136 return 0;
4137}
4138
4139static
8d65af78 4140int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4141 void __user *buffer, size_t *lenp, loff_t *ppos)
4142{
4143 int *valp = ctl->data;
4144 int val = *valp;
88af182e 4145 loff_t pos = *ppos;
56d417b1
BH		 4146 int ret;
4147
8d65af78 4148 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4149
4150 if (write)
4151 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4152 if (ret)
4153 *ppos = pos;
56d417b1
BH		 4154 return ret;
4155}
4156
1da177e4
LT		 4157static struct addrconf_sysctl_table
4158{
4159 struct ctl_table_header *sysctl_header;
f6a07b29 4160 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4161 char *dev_name;
ab32ea5d 4162} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4163 .sysctl_header = NULL,
4164 .addrconf_vars = {
1ab1457c 4165 {
1da177e4 4166 .procname = "forwarding",
1ab1457c 4167 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 4168 .maxlen = sizeof(int),
4169 .mode = 0644,
6d9f239a 4170 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4171 },
4172 {
1da177e4 4173 .procname = "hop_limit",
1ab1457c 4174 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 4175 .maxlen = sizeof(int),
4176 .mode = 0644,
4177 .proc_handler = proc_dointvec,
4178 },
4179 {
1da177e4
LT		 4180 .procname = "mtu",
4181 .data = &ipv6_devconf.mtu6,
1ab1457c 4182 .maxlen = sizeof(int),
1da177e4 4183 .mode = 0644,
6d9f239a 4184 .proc_handler = proc_dointvec,
1da177e4
LT		 4185 },
4186 {
1da177e4 4187 .procname = "accept_ra",
1ab1457c 4188 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 4189 .maxlen = sizeof(int),
4190 .mode = 0644,
6d9f239a 4191 .proc_handler = proc_dointvec,
1da177e4
LT		 4192 },
4193 {
1da177e4 4194 .procname = "accept_redirects",
1ab1457c 4195 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 4196 .maxlen = sizeof(int),
4197 .mode = 0644,
6d9f239a 4198 .proc_handler = proc_dointvec,
1da177e4
LT		 4199 },
4200 {
1da177e4 4201 .procname = "autoconf",
1ab1457c 4202 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 4203 .maxlen = sizeof(int),
4204 .mode = 0644,
6d9f239a 4205 .proc_handler = proc_dointvec,
1da177e4
LT		 4206 },
4207 {
1da177e4 4208 .procname = "dad_transmits",
1ab1457c 4209 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 4210 .maxlen = sizeof(int),
4211 .mode = 0644,
6d9f239a 4212 .proc_handler = proc_dointvec,
1da177e4
LT		 4213 },
4214 {
1da177e4 4215 .procname = "router_solicitations",
1ab1457c 4216 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 4217 .maxlen = sizeof(int),
4218 .mode = 0644,
6d9f239a 4219 .proc_handler = proc_dointvec,
1da177e4
LT		 4220 },
4221 {
1da177e4 4222 .procname = "router_solicitation_interval",
1ab1457c 4223 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 4224 .maxlen = sizeof(int),
4225 .mode = 0644,
6d9f239a 4226 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4227 },
4228 {
1da177e4 4229 .procname = "router_solicitation_delay",
1ab1457c 4230 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 4231 .maxlen = sizeof(int),
4232 .mode = 0644,
6d9f239a 4233 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4234 },
4235 {
1da177e4 4236 .procname = "force_mld_version",
1ab1457c 4237 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 4238 .maxlen = sizeof(int),
4239 .mode = 0644,
6d9f239a 4240 .proc_handler = proc_dointvec,
1da177e4
LT		 4241 },
4242#ifdef CONFIG_IPV6_PRIVACY
4243 {
1da177e4 4244 .procname = "use_tempaddr",
1ab1457c 4245 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 4246 .maxlen = sizeof(int),
4247 .mode = 0644,
6d9f239a 4248 .proc_handler = proc_dointvec,
1da177e4
LT		 4249 },
4250 {
1da177e4 4251 .procname = "temp_valid_lft",
1ab1457c 4252 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 4253 .maxlen = sizeof(int),
4254 .mode = 0644,
6d9f239a 4255 .proc_handler = proc_dointvec,
1da177e4
LT		 4256 },
4257 {
1da177e4 4258 .procname = "temp_prefered_lft",
1ab1457c 4259 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 4260 .maxlen = sizeof(int),
4261 .mode = 0644,
6d9f239a 4262 .proc_handler = proc_dointvec,
1da177e4
LT		 4263 },
4264 {
1da177e4 4265 .procname = "regen_max_retry",
1ab1457c 4266 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 4267 .maxlen = sizeof(int),
4268 .mode = 0644,
6d9f239a 4269 .proc_handler = proc_dointvec,
1da177e4
LT		 4270 },
4271 {
1da177e4 4272 .procname = "max_desync_factor",
1ab1457c 4273 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4274 .maxlen = sizeof(int),
4275 .mode = 0644,
6d9f239a 4276 .proc_handler = proc_dointvec,
1da177e4
LT		 4277 },
4278#endif
4279 {
1da177e4
LT		 4280 .procname = "max_addresses",
4281 .data = &ipv6_devconf.max_addresses,
4282 .maxlen = sizeof(int),
4283 .mode = 0644,
6d9f239a 4284 .proc_handler = proc_dointvec,
1da177e4 4285 },
65f5c7c1 4286 {
65f5c7c1 4287 .procname = "accept_ra_defrtr",
1ab1457c 4288 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4289 .maxlen = sizeof(int),
4290 .mode = 0644,
6d9f239a 4291 .proc_handler = proc_dointvec,
65f5c7c1 4292 },
c4fd30eb 4293 {
c4fd30eb 4294 .procname = "accept_ra_pinfo",
1ab1457c 4295 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4296 .maxlen = sizeof(int),
4297 .mode = 0644,
6d9f239a 4298 .proc_handler = proc_dointvec,
c4fd30eb 4299 },
930d6ff2
YH		 4300#ifdef CONFIG_IPV6_ROUTER_PREF
4301 {
930d6ff2
YH		 4302 .procname = "accept_ra_rtr_pref",
4303 .data = &ipv6_devconf.accept_ra_rtr_pref,
4304 .maxlen = sizeof(int),
4305 .mode = 0644,
6d9f239a 4306 .proc_handler = proc_dointvec,
930d6ff2 4307 },
52e16356 4308 {
52e16356
YH		 4309 .procname = "router_probe_interval",
4310 .data = &ipv6_devconf.rtr_probe_interval,
4311 .maxlen = sizeof(int),
4312 .mode = 0644,
6d9f239a 4313 .proc_handler = proc_dointvec_jiffies,
52e16356 4314 },
fa03ef38 4315#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4316 {
09c884d4
YH		 4317 .procname = "accept_ra_rt_info_max_plen",
4318 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4319 .maxlen = sizeof(int),
4320 .mode = 0644,
6d9f239a 4321 .proc_handler = proc_dointvec,
09c884d4
YH		 4322 },
4323#endif
930d6ff2 4324#endif
fbea49e1 4325 {
fbea49e1
YH		 4326 .procname = "proxy_ndp",
4327 .data = &ipv6_devconf.proxy_ndp,
4328 .maxlen = sizeof(int),
4329 .mode = 0644,
6d9f239a 4330 .proc_handler = proc_dointvec,
fbea49e1 4331 },
0bcbc926 4332 {
0bcbc926
YH		 4333 .procname = "accept_source_route",
4334 .data = &ipv6_devconf.accept_source_route,
4335 .maxlen = sizeof(int),
4336 .mode = 0644,
6d9f239a 4337 .proc_handler = proc_dointvec,
0bcbc926 4338 },
95c385b4
NH		 4339#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4340 {
95c385b4
NH		 4341 .procname = "optimistic_dad",
4342 .data = &ipv6_devconf.optimistic_dad,
4343 .maxlen = sizeof(int),
4344 .mode = 0644,
6d9f239a 4345 .proc_handler = proc_dointvec,
95c385b4
NH		 4346
4347 },
7bc570c8
YH		 4348#endif
4349#ifdef CONFIG_IPV6_MROUTE
4350 {
7bc570c8
YH		 4351 .procname = "mc_forwarding",
4352 .data = &ipv6_devconf.mc_forwarding,
4353 .maxlen = sizeof(int),
a4e6db07 4354 .mode = 0444,
6d9f239a 4355 .proc_handler = proc_dointvec,
7bc570c8 4356 },
95c385b4 4357#endif
778d80be 4358 {
778d80be
YH		 4359 .procname = "disable_ipv6",
4360 .data = &ipv6_devconf.disable_ipv6,
4361 .maxlen = sizeof(int),
4362 .mode = 0644,
56d417b1 4363 .proc_handler = addrconf_sysctl_disable,
778d80be 4364 },
1b34be74 4365 {
1b34be74
YH		 4366 .procname = "accept_dad",
4367 .data = &ipv6_devconf.accept_dad,
4368 .maxlen = sizeof(int),
4369 .mode = 0644,
6d9f239a 4370 .proc_handler = proc_dointvec,
1b34be74 4371 },
f7734fdf 4372 {
f7734fdf
OP		 4373 .procname = "force_tllao",
4374 .data = &ipv6_devconf.force_tllao,
4375 .maxlen = sizeof(int),
4376 .mode = 0644,
4377 .proc_handler = proc_dointvec
4378 },
1da177e4 4379 {
f8572d8f 4380 /* sentinel */
1da177e4
LT		 4381 }
4382 },
1da177e4
LT		 4383};
4384
bff16c2f 4385static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4386 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4387{
4388 int i;
1da177e4 4389 struct addrconf_sysctl_table *t;
1da177e4 4390
1dab6222
PE		 4391#define ADDRCONF_CTL_PATH_DEV 3
4392
4393 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4394 { .procname = "net", },
4395 { .procname = "ipv6", },
4396 { .procname = "conf", },
1dab6222
PE		 4397 { /* to be set */ },
4398 { },
4399 };
4400
4401
af879cc7 4402 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4403 if (t == NULL)
f68635e6
PE		 4404 goto out;
4405
1da177e4
LT		 4406 for (i=0; t->addrconf_vars[i].data; i++) {
4407 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4408 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4409 t->addrconf_vars[i].extra2 = net;
1da177e4 4410 }
1da177e4 4411
1ab1457c
YH		 4412 /*
4413 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4414 * by sysctl and we wouldn't want anyone to change it under our feet
4415 * (see SIOCSIFNAME).
1ab1457c 4416 */
1dab6222
PE		 4417 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4418 if (!t->dev_name)
f68635e6 4419 goto free;
1da177e4 4420
1dab6222 4421 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4422
bff16c2f 4423 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4424 t->addrconf_vars);
1da177e4
LT		 4425 if (t->sysctl_header == NULL)
4426 goto free_procname;
f68635e6
PE		 4427
4428 p->sysctl = t;
95897312 4429 return 0;
1da177e4 4430
f68635e6 4431free_procname:
1dab6222 4432 kfree(t->dev_name);
f68635e6 4433free:
1da177e4 4434 kfree(t);
f68635e6 4435out:
95897312 4436 return -ENOBUFS;
1da177e4
LT		 4437}
4438
408c4768
PE		 4439static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4440{
4441 struct addrconf_sysctl_table *t;
4442
4443 if (p->sysctl == NULL)
4444 return;
4445
4446 t = p->sysctl;
4447 p->sysctl = NULL;
4448 unregister_sysctl_table(t->sysctl_header);
4449 kfree(t->dev_name);
4450 kfree(t);
4451}
4452
f52295a9
PE		 4453static void addrconf_sysctl_register(struct inet6_dev *idev)
4454{
54716e3b 4455 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4456 &ndisc_ifinfo_sysctl_change);
c346dca1 4457 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4458 idev, &idev->cnf);
f52295a9
PE		 4459}
4460
408c4768 4461static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4462{
408c4768
PE		 4463 __addrconf_sysctl_unregister(&idev->cnf);
4464 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4465}
4466
4467
4468#endif
4469
2c8c1e72 4470static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4471{
4472 int err;
4473 struct ipv6_devconf *all, *dflt;
4474
4475 err = -ENOMEM;
4476 all = &ipv6_devconf;
4477 dflt = &ipv6_devconf_dflt;
4478
09ad9bc7 4479 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4480 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4481 if (all == NULL)
4482 goto err_alloc_all;
4483
4484 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4485 if (dflt == NULL)
4486 goto err_alloc_dflt;
56d417b1
BH		 4487 } else {
4488 /* these will be inherited by all namespaces */
4489 dflt->autoconf = ipv6_defaults.autoconf;
4490 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4491 }
4492
4493 net->ipv6.devconf_all = all;
4494 net->ipv6.devconf_dflt = dflt;
4495
4496#ifdef CONFIG_SYSCTL
f8572d8f 4497 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4498 if (err < 0)
4499 goto err_reg_all;
4500
f8572d8f 4501 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4502 if (err < 0)
4503 goto err_reg_dflt;
4504#endif
4505 return 0;
4506
4507#ifdef CONFIG_SYSCTL
4508err_reg_dflt:
4509 __addrconf_sysctl_unregister(all);
4510err_reg_all:
4511 kfree(dflt);
4512#endif
4513err_alloc_dflt:
4514 kfree(all);
4515err_alloc_all:
4516 return err;
4517}
4518
2c8c1e72 4519static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4520{
4521#ifdef CONFIG_SYSCTL
4522 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4523 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4524#endif
09ad9bc7 4525 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4526 kfree(net->ipv6.devconf_dflt);
4527 kfree(net->ipv6.devconf_all);
4528 }
4529}
4530
4531static struct pernet_operations addrconf_ops = {
4532 .init = addrconf_init_net,
4533 .exit = addrconf_exit_net,
4534};
4535
1da177e4
LT		 4536/*
4537 * Device notifier
4538 */
4539
4540int register_inet6addr_notifier(struct notifier_block *nb)
4541{
1ab1457c 4542 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4543}
4544
7159039a
YH		 4545EXPORT_SYMBOL(register_inet6addr_notifier);
4546
1da177e4
LT		 4547int unregister_inet6addr_notifier(struct notifier_block *nb)
4548{
1ab1457c 4549 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4550}
4551
7159039a
YH		 4552EXPORT_SYMBOL(unregister_inet6addr_notifier);
4553
1da177e4
LT		 4554/*
4555 * Init / cleanup code
4556 */
4557
4558int __init addrconf_init(void)
4559{
2a8cc6c8
YH		 4560 int err;
4561
4562 if ((err = ipv6_addr_label_init()) < 0) {
4563 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4564 err);
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
LT		 4594
4595 register_netdevice_notifier(&ipv6_dev_notf);
4596
1da177e4 4597 addrconf_verify(0);
c127ea2c
TG		 4598
4599 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4600 if (err < 0)
4601 goto errout;
4602
4603 /* Only the first call to __rtnl_register can fail */
4604 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4605 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4606 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4607 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4608 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4609
2a8cc6c8
YH		 4610 ipv6_addr_label_rtnl_register();
4611
1da177e4 4612 return 0;
c127ea2c
TG		 4613errout:
4614 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4615errlo:
4616 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4617
4618 return err;
1da177e4
LT		 4619}
4620
09f7709f 4621void addrconf_cleanup(void)
1da177e4 4622{
1ab1457c 4623 struct inet6_ifaddr *ifa;
176c39af 4624 struct net_device *dev;
1da177e4
LT		 4625 int i;
4626
4627 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4628 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4629
4630 rtnl_lock();
4631
176c39af
DL		 4632 /* clean dev list */
4633 for_each_netdev(&init_net, dev) {
4634 if (__in6_dev_get(dev) == NULL)
4635 continue;
4636 addrconf_ifdown(dev, 1);
4637 }
4638 addrconf_ifdown(init_net.loopback_dev, 2);
4639
1da177e4
LT		 4640 /*
4641 * Check hash table.
4642 */
1da177e4
LT		 4643 write_lock_bh(&addrconf_hash_lock);
4644 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4645 for (ifa=inet6_addr_lst[i]; ifa; ) {
4646 struct inet6_ifaddr *bifa;
4647
4648 bifa = ifa;
4649 ifa = ifa->lst_next;
4650 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4651 /* Do not free it; something is wrong.
4652 Now we can investigate it with debugger.
4653 */
4654 }
4655 }
4656 write_unlock_bh(&addrconf_hash_lock);
4657
4658 del_timer(&addr_chk_timer);
1da177e4 4659 rtnl_unlock();
1da177e4 4660}
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