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[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
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 101
102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
1da177e4 106
b2db7564
YH		 107#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108#define ADDRCONF_TIMER_FUZZ (HZ / 4)
109#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
1da177e4 111#ifdef CONFIG_SYSCTL
f52295a9 112static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 113static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114#else
115static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116{
117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
1da177e4
LT		 122#endif
123
124#ifdef CONFIG_IPV6_PRIVACY
125static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 126static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 127static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 128#endif
129
1b34be74 130static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 131static int ipv6_count_addresses(struct inet6_dev *idev);
132
133/*
134 * Configured unicast address hash table
135 */
c2e21293 136static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 137static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 138
1da177e4
LT		 139static void addrconf_verify(unsigned long);
140
8d06afab 141static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 142static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
93d9b7d7
JP		 147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
1da177e4
LT		 149static int addrconf_ifdown(struct net_device *dev, int how);
150
e431b8c0 151static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 152static void addrconf_dad_timer(unsigned long data);
153static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 154static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 155static void addrconf_rs_timer(unsigned long data);
156static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
1ab1457c 159static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 160 struct prefix_info *pinfo);
3e81c6da
DM		 161static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
1da177e4 163
e041c683 164static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 165
888c848e 166static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178#ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184#endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 186 .accept_ra_defrtr = 1,
c4fd30eb 187 .accept_ra_pinfo = 1,
930d6ff2
YH		 188#ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
52e16356 190 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 191#ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193#endif
930d6ff2 194#endif
fbea49e1 195 .proxy_ndp = 0,
0bcbc926 196 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 197 .disable_ipv6 = 0,
1b34be74 198 .accept_dad = 1,
1da177e4
LT		 199};
200
ab32ea5d 201static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212#ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218#endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 220 .accept_ra_defrtr = 1,
c4fd30eb 221 .accept_ra_pinfo = 1,
930d6ff2
YH		 222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
52e16356 224 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
930d6ff2 228#endif
fbea49e1 229 .proxy_ndp = 0,
0bcbc926 230 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 231 .disable_ipv6 = 0,
1b34be74 232 .accept_dad = 1,
1da177e4
LT		 233};
234
235/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 236const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 237const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 238const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 240
f24e3d65 241/* Check if a valid qdisc is available */
05297949 242static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 243{
05297949 244 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 245}
246
2b5ead46
YH		 247/* Check if a route is valid prefix route */
248static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249{
a02cec21 250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 251}
252
1da177e4
LT		 253static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254{
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257}
258
e21e8467 259enum addrconf_timer_t {
1da177e4
LT		 260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263};
264
265static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268{
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
e21e8467
SH		 279 default:
280 break;
1da177e4
LT		 281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284}
285
7f7d9a6b
HX		 286static int snmp6_alloc_dev(struct inet6_dev *idev)
287{
7d720c3e 288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 291 goto err_ip;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
1823e4c8
ED		 293 sizeof(struct icmpv6_mib),
294 __alignof__(struct icmpv6_mib)) < 0)
7f7d9a6b 295 goto err_icmp;
7d720c3e 296 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
1823e4c8
ED		 297 sizeof(struct icmpv6msg_mib),
298 __alignof__(struct icmpv6msg_mib)) < 0)
14878f75 299 goto err_icmpmsg;
7f7d9a6b
HX		 300
301 return 0;
302
14878f75 303err_icmpmsg:
7d720c3e 304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 305err_icmp:
7d720c3e 306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 307err_ip:
aaf70ec7 308 return -ENOMEM;
7f7d9a6b
HX		 309}
310
16910b98 311static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 312{
7d720c3e
TH		 313 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
314 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 316}
317
1da177e4
LT		 318/* Nobody refers to this device, we may destroy it. */
319
8814c4b5
YH		 320static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
321{
322 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
323 kfree(idev);
324}
325
1da177e4
LT		 326void in6_dev_finish_destroy(struct inet6_dev *idev)
327{
328 struct net_device *dev = idev->dev;
547b792c 329
502a2ffd 330 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 331 WARN_ON(idev->mc_list != NULL);
332
1da177e4
LT		 333#ifdef NET_REFCNT_DEBUG
334 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
335#endif
336 dev_put(dev);
337 if (!idev->dead) {
e21e8467 338 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 339 return;
340 }
341 snmp6_free_dev(idev);
8814c4b5 342 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 343}
344
7159039a
YH		 345EXPORT_SYMBOL(in6_dev_finish_destroy);
346
1da177e4
LT		 347static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
348{
349 struct inet6_dev *ndev;
350
351 ASSERT_RTNL();
352
353 if (dev->mtu < IPV6_MIN_MTU)
354 return NULL;
355
1ab1457c 356 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 357
1ab1457c
YH		 358 if (ndev == NULL)
359 return NULL;
322f74a4
IO		 360
361 rwlock_init(&ndev->lock);
362 ndev->dev = dev;
502a2ffd 363 INIT_LIST_HEAD(&ndev->addr_list);
364
c346dca1 365 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 366 ndev->cnf.mtu6 = dev->mtu;
367 ndev->cnf.sysctl = NULL;
368 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
369 if (ndev->nd_parms == NULL) {
370 kfree(ndev);
371 return NULL;
372 }
0187bdfb
BH		 373 if (ndev->cnf.forwarding)
374 dev_disable_lro(dev);
322f74a4
IO		 375 /* We refer to the device */
376 dev_hold(dev);
1da177e4 377
322f74a4
IO		 378 if (snmp6_alloc_dev(ndev) < 0) {
379 ADBG((KERN_WARNING
380 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 381 __func__, dev->name));
322f74a4
IO		 382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 ndev->dead = 1;
384 in6_dev_finish_destroy(ndev);
385 return NULL;
386 }
1da177e4 387
322f74a4
IO		 388 if (snmp6_register_dev(ndev) < 0) {
389 ADBG((KERN_WARNING
390 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 391 __func__, dev->name));
322f74a4
IO		 392 neigh_parms_release(&nd_tbl, ndev->nd_parms);
393 ndev->dead = 1;
394 in6_dev_finish_destroy(ndev);
395 return NULL;
396 }
397
398 /* One reference from device. We must do this before
399 * we invoke __ipv6_regen_rndid().
400 */
401 in6_dev_hold(ndev);
1da177e4 402
1b34be74
YH		 403 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
404 ndev->cnf.accept_dad = -1;
405
b077d7ab
YH		 406#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
407 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
408 printk(KERN_INFO
409 "%s: Disabled Multicast RS\n",
410 dev->name);
411 ndev->cnf.rtr_solicits = 0;
412 }
413#endif
414
1da177e4 415#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 416 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 417 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 418 if ((dev->flags&IFF_LOOPBACK) ||
419 dev->type == ARPHRD_TUNNEL ||
9625ed72 420 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 421 dev->type == ARPHRD_SIT ||
0be669bb 422 dev->type == ARPHRD_NONE) {
322f74a4
IO		 423 ndev->cnf.use_tempaddr = -1;
424 } else {
425 in6_dev_hold(ndev);
426 ipv6_regen_rndid((unsigned long) ndev);
427 }
1da177e4
LT		 428#endif
429
f24e3d65 430 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 431 ndev->if_flags |= IF_READY;
432
322f74a4
IO		 433 ipv6_mc_init_dev(ndev);
434 ndev->tstamp = jiffies;
f52295a9 435 addrconf_sysctl_register(ndev);
30c4cf57
DS		 436 /* protected by rtnl_lock */
437 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 438
439 /* Join all-node multicast group */
f3ee4010 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 441
1da177e4
LT		 442 return ndev;
443}
444
cee89473 445static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 446{
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
e21e8467
SH		 451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (!idev)
1da177e4
LT		 455 return NULL;
456 }
c5e33bdd 457
1da177e4
LT		 458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461}
462
463#ifdef CONFIG_SYSCTL
464static void dev_forward_change(struct inet6_dev *idev)
465{
466 struct net_device *dev;
467 struct inet6_ifaddr *ifa;
1da177e4
LT		 468
469 if (!idev)
470 return;
471 dev = idev->dev;
0187bdfb
BH		 472 if (idev->cnf.forwarding)
473 dev_disable_lro(dev);
1da177e4 474 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 475 if (idev->cnf.forwarding)
f3ee4010 476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 477 else
f3ee4010 478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 479 }
502a2ffd 480
481 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 482 if (ifa->flags&IFA_F_TENTATIVE)
483 continue;
1da177e4
LT		 484 if (idev->cnf.forwarding)
485 addrconf_join_anycast(ifa);
486 else
487 addrconf_leave_anycast(ifa);
488 }
489}
490
491
e186932b 492static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 493{
494 struct net_device *dev;
495 struct inet6_dev *idev;
496
c6d14c84
ED		 497 rcu_read_lock();
498 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 499 idev = __in6_dev_get(dev);
500 if (idev) {
e186932b
PE		 501 int changed = (!idev->cnf.forwarding) ^ (!newf);
502 idev->cnf.forwarding = newf;
1da177e4
LT		 503 if (changed)
504 dev_forward_change(idev);
505 }
1da177e4 506 }
c6d14c84 507 rcu_read_unlock();
1da177e4 508}
c8fecf22 509
b325fddb 510static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 511{
bff16c2f
PE		 512 struct net *net;
513
514 net = (struct net *)table->extra2;
441fc2a2 515 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 516 return 0;
517
88af182e
EB		 518 if (!rtnl_trylock()) {
519 /* Restore the original values before restarting */
520 *p = old;
5007392d 521 return restart_syscall();
88af182e 522 }
c8fecf22 523
e186932b
PE		 524 if (p == &net->ipv6.devconf_all->forwarding) {
525 __s32 newf = net->ipv6.devconf_all->forwarding;
526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
c8fecf22
PE		 528 } else if ((!*p) ^ (!old))
529 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 530 rtnl_unlock();
c8fecf22
PE		 531
532 if (*p)
7b4da532 533 rt6_purge_dflt_routers(net);
b325fddb 534 return 1;
c8fecf22 535}
1da177e4
LT		 536#endif
537
5c578aed 538static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
539{
540 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
541 kfree(ifp);
542}
1da177e4 543
5c578aed 544/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 545void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
546{
c2e21293 547 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 548
1da177e4
LT		 549#ifdef NET_REFCNT_DEBUG
550 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
551#endif
552
553 in6_dev_put(ifp->idev);
554
555 if (del_timer(&ifp->timer))
e21e8467 556 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 557
e9d3e084 558 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
e21e8467 559 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 560 return;
561 }
d8d1f30b 562 dst_release(&ifp->rt->dst);
1da177e4 563
5c578aed 564 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 565}
566
e55ffac6
BH		 567static void
568ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
569{
502a2ffd 570 struct list_head *p;
8a6ce0c0 571 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 572
573 /*
574 * Each device address list is sorted in order of scope -
575 * global before linklocal.
576 */
502a2ffd 577 list_for_each(p, &idev->addr_list) {
578 struct inet6_ifaddr *ifa
579 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 580 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 581 break;
582 }
583
b54c9b98 584 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 585}
586
3a88a81d 587static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 588{
3eb84f49
YH		 589 /*
590 * We perform the hash function over the last 64 bits of the address
591 * This will include the IEEE address token on links that support it.
592 */
0eae88f3
ED		 593 return jhash_2words((__force u32)addr->s6_addr32[2],
594 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 595 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 596}
597
1da177e4
LT		 598/* On success it returns ifp with increased reference count */
599
600static struct inet6_ifaddr *
601ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 602 int scope, u32 flags)
1da177e4
LT		 603{
604 struct inet6_ifaddr *ifa = NULL;
605 struct rt6_info *rt;
3a88a81d 606 unsigned int hash;
1da177e4 607 int err = 0;
d68b8270
YH		 608 int addr_type = ipv6_addr_type(addr);
609
610 if (addr_type == IPV6_ADDR_ANY ||
611 addr_type & IPV6_ADDR_MULTICAST ||
612 (!(idev->dev->flags & IFF_LOOPBACK) &&
613 addr_type & IPV6_ADDR_LOOPBACK))
614 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 615
8814c4b5 616 rcu_read_lock_bh();
1da177e4
LT		 617 if (idev->dead) {
618 err = -ENODEV; /*XXX*/
619 goto out2;
620 }
621
56d417b1 622 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 623 err = -EACCES;
624 goto out2;
625 }
626
5c578aed 627 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 628
629 /* Ignore adding duplicate addresses on an interface */
c346dca1 630 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 631 ADBG(("ipv6_add_addr: already assigned\n"));
632 err = -EEXIST;
633 goto out;
634 }
635
322f74a4 636 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 637
638 if (ifa == NULL) {
639 ADBG(("ipv6_add_addr: malloc failed\n"));
640 err = -ENOBUFS;
641 goto out;
642 }
643
644 rt = addrconf_dst_alloc(idev, addr, 0);
645 if (IS_ERR(rt)) {
646 err = PTR_ERR(rt);
647 goto out;
648 }
649
1da177e4
LT		 650 ipv6_addr_copy(&ifa->addr, addr);
651
652 spin_lock_init(&ifa->lock);
e9d3e084 653 spin_lock_init(&ifa->state_lock);
1da177e4 654 init_timer(&ifa->timer);
c2e21293 655 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 656 ifa->timer.data = (unsigned long) ifa;
657 ifa->scope = scope;
658 ifa->prefix_len = pfxlen;
659 ifa->flags = flags | IFA_F_TENTATIVE;
660 ifa->cstamp = ifa->tstamp = jiffies;
661
57f5f544
KF		 662 ifa->rt = rt;
663
95c385b4
NH		 664 /*
665 * part one of RFC 4429, section 3.3
666 * We should not configure an address as
667 * optimistic if we do not yet know the link
668 * layer address of our nexhop router
669 */
670
671 if (rt->rt6i_nexthop == NULL)
672 ifa->flags &= ~IFA_F_OPTIMISTIC;
673
1da177e4
LT		 674 ifa->idev = idev;
675 in6_dev_hold(idev);
676 /* For caller */
677 in6_ifa_hold(ifa);
678
679 /* Add to big hash table */
680 hash = ipv6_addr_hash(addr);
681
5c578aed 682 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 683 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 684
685 write_lock(&idev->lock);
686 /* Add to inet6_dev unicast addr list. */
e55ffac6 687 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 688
689#ifdef CONFIG_IPV6_PRIVACY
690 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 691 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 692 in6_ifa_hold(ifa);
693 }
694#endif
695
1da177e4
LT		 696 in6_ifa_hold(ifa);
697 write_unlock(&idev->lock);
698out2:
8814c4b5 699 rcu_read_unlock_bh();
1da177e4 700
fd92833a 701 if (likely(err == 0))
e041c683 702 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 703 else {
704 kfree(ifa);
705 ifa = ERR_PTR(err);
706 }
707
708 return ifa;
709out:
5c578aed 710 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 711 goto out2;
712}
713
714/* This function wants to get referenced ifp and releases it before return */
715
716static void ipv6_del_addr(struct inet6_ifaddr *ifp)
717{
502a2ffd 718 struct inet6_ifaddr *ifa, *ifn;
1da177e4 719 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 720 int state;
1da177e4
LT		 721 int hash;
722 int deleted = 0, onlink = 0;
723 unsigned long expires = jiffies;
724
725 hash = ipv6_addr_hash(&ifp->addr);
726
4c5ff6a6
HX		 727 spin_lock_bh(&ifp->state_lock);
728 state = ifp->state;
e9d3e084 729 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 730 spin_unlock_bh(&ifp->state_lock);
731
732 if (state == INET6_IFADDR_STATE_DEAD)
733 goto out;
1da177e4 734
5c578aed 735 spin_lock_bh(&addrconf_hash_lock);
736 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 737 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 738
739 write_lock_bh(&idev->lock);
740#ifdef CONFIG_IPV6_PRIVACY
741 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 742 list_del(&ifp->tmp_list);
743 if (ifp->ifpub) {
744 in6_ifa_put(ifp->ifpub);
745 ifp->ifpub = NULL;
1da177e4 746 }
372e6c8f 747 __in6_ifa_put(ifp);
1da177e4
LT		 748 }
749#endif
750
502a2ffd 751 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 752 if (ifa == ifp) {
502a2ffd 753 list_del_init(&ifp->if_list);
1da177e4 754 __in6_ifa_put(ifp);
502a2ffd 755
1da177e4
LT		 756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
757 break;
758 deleted = 1;
1d142804 759 continue;
1da177e4
LT		 760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 ifp->prefix_len)) {
763 if (ifa->flags & IFA_F_PERMANENT) {
764 onlink = 1;
765 if (deleted)
766 break;
767 } else {
768 unsigned long lifetime;
769
770 if (!onlink)
771 onlink = -1;
772
773 spin_lock(&ifa->lock);
4bed72e4
YH		 774
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 /*
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
780 */
1da177e4
LT		 781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
785 }
786 }
787 }
788 }
789 write_unlock_bh(&idev->lock);
790
b2238566
AV		 791 addrconf_del_timer(ifp);
792
1da177e4
LT		 793 ipv6_ifa_notify(RTM_DELADDR, ifp);
794
e041c683 795 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 796
1da177e4
LT		 797 /*
798 * Purge or update corresponding prefix
799 *
800 * 1) we don't purge prefix here if address was not permanent.
801 * prefix is managed by its own lifetime.
802 * 2) if there're no addresses, delete prefix.
803 * 3) if there're still other permanent address(es),
804 * corresponding prefix is still permanent.
805 * 4) otherwise, update prefix lifetime to the
806 * longest valid lifetime among the corresponding
807 * addresses on the device.
808 * Note: subsequent RA will update lifetime.
809 *
810 * --yoshfuji
811 */
812 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
813 struct in6_addr prefix;
814 struct rt6_info *rt;
c346dca1 815 struct net *net = dev_net(ifp->idev->dev);
1da177e4 816 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 817 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 818
2b5ead46 819 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 820 if (onlink == 0) {
e0a1ad73 821 ip6_del_rt(rt);
1da177e4
LT		 822 rt = NULL;
823 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
824 rt->rt6i_expires = expires;
825 rt->rt6i_flags |= RTF_EXPIRES;
826 }
827 }
d8d1f30b 828 dst_release(&rt->dst);
1da177e4
LT		 829 }
830
4c5ff6a6 831out:
1da177e4
LT		 832 in6_ifa_put(ifp);
833}
834
835#ifdef CONFIG_IPV6_PRIVACY
836static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837{
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
7a876b0e 840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
eac55bf9 841 unsigned long regen_advance;
1da177e4
LT		 842 int tmp_plen;
843 int ret = 0;
844 int max_addresses;
95c385b4 845 u32 addr_flags;
1da177e4
LT		 846
847 write_lock(&idev->lock);
848 if (ift) {
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
852 tmpaddr = &addr;
853 } else {
854 tmpaddr = NULL;
855 }
856retry:
857 in6_dev_hold(idev);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
860 printk(KERN_INFO
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 in6_ifa_hold(ifp);
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
882 printk(KERN_WARNING
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
884 in6_ifa_put(ifp);
885 in6_dev_put(idev);
886 ret = -1;
887 goto out;
888 }
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
7a876b0e 890 age = (jiffies - ifp->tstamp) / HZ;
1da177e4
LT		 891 tmp_valid_lft = min_t(__u32,
892 ifp->valid_lft,
7a876b0e 893 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 894 tmp_prefered_lft = min_t(__u32,
895 ifp->prefered_lft,
7a876b0e 896 idev->cnf.temp_prefered_lft + age -
784e2710 897 idev->cnf.max_desync_factor);
1da177e4
LT		 898 tmp_plen = ifp->prefix_len;
899 max_addresses = idev->cnf.max_addresses;
900 tmp_cstamp = ifp->cstamp;
901 tmp_tstamp = ifp->tstamp;
902 spin_unlock_bh(&ifp->lock);
903
eac55bf9
BB		 904 regen_advance = idev->cnf.regen_max_retry *
905 idev->cnf.dad_transmits *
906 idev->nd_parms->retrans_time / HZ;
1da177e4 907 write_unlock(&idev->lock);
95c385b4 908
eac55bf9
BB		 909 /* A temporary address is created only if this calculated Preferred
910 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
911 * an implementation must not create a temporary address with a zero
912 * Preferred Lifetime.
913 */
914 if (tmp_prefered_lft <= regen_advance) {
915 in6_ifa_put(ifp);
916 in6_dev_put(idev);
917 ret = -1;
918 goto out;
919 }
920
95c385b4
NH		 921 addr_flags = IFA_F_TEMPORARY;
922 /* set in addrconf_prefix_rcv() */
923 if (ifp->flags & IFA_F_OPTIMISTIC)
924 addr_flags |= IFA_F_OPTIMISTIC;
925
1da177e4 926 ift = !max_addresses ||
1ab1457c 927 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 928 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 929 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
930 addr_flags) : NULL;
1da177e4
LT		 931 if (!ift || IS_ERR(ift)) {
932 in6_ifa_put(ifp);
933 in6_dev_put(idev);
934 printk(KERN_INFO
935 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
936 tmpaddr = &addr;
937 write_lock(&idev->lock);
938 goto retry;
939 }
940
941 spin_lock_bh(&ift->lock);
942 ift->ifpub = ifp;
943 ift->valid_lft = tmp_valid_lft;
944 ift->prefered_lft = tmp_prefered_lft;
945 ift->cstamp = tmp_cstamp;
946 ift->tstamp = tmp_tstamp;
947 spin_unlock_bh(&ift->lock);
948
949 addrconf_dad_start(ift, 0);
950 in6_ifa_put(ift);
951 in6_dev_put(idev);
952out:
953 return ret;
954}
955#endif
956
957/*
072047e4 958 * Choose an appropriate source address (RFC3484)
1da177e4 959 */
a9b05723
YH		 960enum {
961 IPV6_SADDR_RULE_INIT = 0,
962 IPV6_SADDR_RULE_LOCAL,
963 IPV6_SADDR_RULE_SCOPE,
964 IPV6_SADDR_RULE_PREFERRED,
965#ifdef CONFIG_IPV6_MIP6
966 IPV6_SADDR_RULE_HOA,
967#endif
968 IPV6_SADDR_RULE_OIF,
969 IPV6_SADDR_RULE_LABEL,
970#ifdef CONFIG_IPV6_PRIVACY
971 IPV6_SADDR_RULE_PRIVACY,
972#endif
973 IPV6_SADDR_RULE_ORCHID,
974 IPV6_SADDR_RULE_PREFIX,
975 IPV6_SADDR_RULE_MAX
976};
977
072047e4 978struct ipv6_saddr_score {
a9b05723
YH		 979 int rule;
980 int addr_type;
981 struct inet6_ifaddr *ifa;
982 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
983 int scopedist;
984 int matchlen;
072047e4
YH		 985};
986
a9b05723 987struct ipv6_saddr_dst {
9acd9f3a 988 const struct in6_addr *addr;
a9b05723
YH		 989 int ifindex;
990 int scope;
991 int label;
7cbca67c 992 unsigned int prefs;
a9b05723 993};
072047e4 994
b6f99a21 995static inline int ipv6_saddr_preferred(int type)
1da177e4 996{
45bb0060 997 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 998 return 1;
999 return 0;
1da177e4
LT		 1000}
1001
3de23255
BT		 1002static int ipv6_get_saddr_eval(struct net *net,
1003 struct ipv6_saddr_score *score,
a9b05723
YH		 1004 struct ipv6_saddr_dst *dst,
1005 int i)
1006{
1007 int ret;
1008
1009 if (i <= score->rule) {
1010 switch (i) {
1011 case IPV6_SADDR_RULE_SCOPE:
1012 ret = score->scopedist;
1013 break;
1014 case IPV6_SADDR_RULE_PREFIX:
1015 ret = score->matchlen;
1016 break;
1017 default:
1018 ret = !!test_bit(i, score->scorebits);
1019 }
1020 goto out;
1021 }
1022
1023 switch (i) {
1024 case IPV6_SADDR_RULE_INIT:
1025 /* Rule 0: remember if hiscore is not ready yet */
1026 ret = !!score->ifa;
1027 break;
1028 case IPV6_SADDR_RULE_LOCAL:
1029 /* Rule 1: Prefer same address */
1030 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1031 break;
1032 case IPV6_SADDR_RULE_SCOPE:
1033 /* Rule 2: Prefer appropriate scope
1034 *
1035 * ret
1036 * ^
1037 * -1 | d 15
1038 * ---+--+-+---> scope
1039 * |
1040 * | d is scope of the destination.
1041 * B-d | \
1042 * | \ <- smaller scope is better if
1043 * B-15 | \ if scope is enough for destinaion.
1044 * | ret = B - scope (-1 <= scope >= d <= 15).
1045 * d-C-1 | /
1046 * |/ <- greater is better
1047 * -C / if scope is not enough for destination.
1048 * /| ret = scope - C (-1 <= d < scope <= 15).
1049 *
1050 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1051 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1052 * Assume B = 0 and we get C > 29.
1053 */
1054 ret = __ipv6_addr_src_scope(score->addr_type);
1055 if (ret >= dst->scope)
1056 ret = -ret;
1057 else
1058 ret -= 128; /* 30 is enough */
1059 score->scopedist = ret;
1060 break;
1061 case IPV6_SADDR_RULE_PREFERRED:
1062 /* Rule 3: Avoid deprecated and optimistic addresses */
1063 ret = ipv6_saddr_preferred(score->addr_type) ||
1064 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1065 break;
1066#ifdef CONFIG_IPV6_MIP6
1067 case IPV6_SADDR_RULE_HOA:
7cbca67c 1068 {
a9b05723 1069 /* Rule 4: Prefer home address */
7cbca67c
YH		 1070 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1071 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1072 break;
7cbca67c 1073 }
a9b05723
YH		 1074#endif
1075 case IPV6_SADDR_RULE_OIF:
1076 /* Rule 5: Prefer outgoing interface */
1077 ret = (!dst->ifindex ||
1078 dst->ifindex == score->ifa->idev->dev->ifindex);
1079 break;
1080 case IPV6_SADDR_RULE_LABEL:
1081 /* Rule 6: Prefer matching label */
3de23255
BT		 1082 ret = ipv6_addr_label(net,
1083 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1084 score->ifa->idev->dev->ifindex) == dst->label;
1085 break;
1086#ifdef CONFIG_IPV6_PRIVACY
1087 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1088 {
a9b05723
YH		 1089 /* Rule 7: Prefer public address
1090 * Note: prefer temprary address if use_tempaddr >= 2
1091 */
7cbca67c
YH		 1092 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1093 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1094 score->ifa->idev->cnf.use_tempaddr >= 2;
1095 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1096 break;
7cbca67c 1097 }
a9b05723
YH		 1098#endif
1099 case IPV6_SADDR_RULE_ORCHID:
1100 /* Rule 8-: Prefer ORCHID vs ORCHID or
1101 * non-ORCHID vs non-ORCHID
1102 */
1103 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1104 ipv6_addr_orchid(dst->addr));
1105 break;
1106 case IPV6_SADDR_RULE_PREFIX:
1107 /* Rule 8: Use longest matching prefix */
1108 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1109 dst->addr);
1110 break;
1111 default:
1112 ret = 0;
1113 }
1114
1115 if (ret)
1116 __set_bit(i, score->scorebits);
1117 score->rule = i;
1118out:
1119 return ret;
1120}
1121
191cd582 1122int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1123 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1124 struct in6_addr *saddr)
1da177e4 1125{
a9b05723
YH		 1126 struct ipv6_saddr_score scores[2],
1127 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1128 struct ipv6_saddr_dst dst;
072047e4 1129 struct net_device *dev;
a9b05723 1130 int dst_type;
1da177e4 1131
a9b05723
YH		 1132 dst_type = __ipv6_addr_type(daddr);
1133 dst.addr = daddr;
1134 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1135 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1136 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1137 dst.prefs = prefs;
a9b05723
YH		 1138
1139 hiscore->rule = -1;
1140 hiscore->ifa = NULL;
1da177e4 1141
8814c4b5 1142 rcu_read_lock();
1da177e4 1143
c6d14c84 1144 for_each_netdev_rcu(net, dev) {
072047e4 1145 struct inet6_dev *idev;
072047e4 1146
a9b05723 1147 /* Candidate Source Address (section 4)
072047e4
YH		 1148 * - multicast and link-local destination address,
1149 * the set of candidate source address MUST only
1150 * include addresses assigned to interfaces
1151 * belonging to the same link as the outgoing
1152 * interface.
1153 * (- For site-local destination addresses, the
1154 * set of candidate source addresses MUST only
1155 * include addresses assigned to interfaces
1156 * belonging to the same site as the outgoing
1157 * interface.)
1158 */
a9b05723
YH		 1159 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1160 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1161 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1162 continue;
1da177e4 1163
1da177e4 1164 idev = __in6_dev_get(dev);
072047e4
YH		 1165 if (!idev)
1166 continue;
1167
1168 read_lock_bh(&idev->lock);
502a2ffd 1169 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1170 int i;
072047e4 1171
a9b05723 1172 /*
6b3ae80a
YH		 1173 * - Tentative Address (RFC2462 section 5.4)
1174 * - A tentative address is not considered
1175 * "assigned to an interface" in the traditional
95c385b4 1176 * sense, unless it is also flagged as optimistic.
6b3ae80a 1177 * - Candidate Source Address (section 4)
072047e4
YH		 1178 * - In any case, anycast addresses, multicast
1179 * addresses, and the unspecified address MUST
1180 * NOT be included in a candidate set.
1181 */
a9b05723
YH		 1182 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1183 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1184 continue;
a9b05723
YH		 1185
1186 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1187
1188 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1189 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1190 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1191 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1192 "assigned as unicast address on %s",
1193 dev->name);
1194 continue;
1195 }
1196
a9b05723
YH		 1197 score->rule = -1;
1198 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1199
1200 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1201 int minihiscore, miniscore;
1202
3de23255
BT		 1203 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1204 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1205
1206 if (minihiscore > miniscore) {
1207 if (i == IPV6_SADDR_RULE_SCOPE &&
1208 score->scopedist > 0) {
1209 /*
1210 * special case:
1211 * each remaining entry
1212 * has too small (not enough)
1213 * scope, because ifa entries
1214 * are sorted by their scope
1215 * values.
1216 */
1217 goto try_nextdev;
1218 }
1219 break;
1220 } else if (minihiscore < miniscore) {
a9b05723
YH		 1221 if (hiscore->ifa)
1222 in6_ifa_put(hiscore->ifa);
1223
1224 in6_ifa_hold(score->ifa);
1225
a0bffffc 1226 swap(hiscore, score);
a9b05723
YH		 1227
1228 /* restore our iterator */
1229 score->ifa = hiscore->ifa;
1230
1231 break;
1da177e4 1232 }
072047e4 1233 }
1da177e4 1234 }
a9b05723 1235try_nextdev:
072047e4 1236 read_unlock_bh(&idev->lock);
1da177e4 1237 }
8814c4b5 1238 rcu_read_unlock();
1da177e4 1239
a9b05723 1240 if (!hiscore->ifa)
072047e4 1241 return -EADDRNOTAVAIL;
1ab1457c 1242
a9b05723
YH		 1243 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1244 in6_ifa_put(hiscore->ifa);
072047e4 1245 return 0;
1da177e4 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();
e21e8467
SH		 1256 idev = __in6_dev_get(dev);
1257 if (idev) {
1da177e4
LT		 1258 struct inet6_ifaddr *ifp;
1259
1260 read_lock_bh(&idev->lock);
502a2ffd 1261 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1262 if (ifp->scope == IFA_LINK &&
1263 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1264 ipv6_addr_copy(addr, &ifp->addr);
1265 err = 0;
1266 break;
1267 }
1268 }
1269 read_unlock_bh(&idev->lock);
1270 }
8814c4b5 1271 rcu_read_unlock();
1da177e4
LT		 1272 return err;
1273}
1274
1275static int ipv6_count_addresses(struct inet6_dev *idev)
1276{
1277 int cnt = 0;
1278 struct inet6_ifaddr *ifp;
1279
1280 read_lock_bh(&idev->lock);
502a2ffd 1281 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1282 cnt++;
1283 read_unlock_bh(&idev->lock);
1284 return cnt;
1285}
1286
bfeade08
DL		 1287int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1288 struct net_device *dev, int strict)
1da177e4 1289{
eedf042a 1290 struct inet6_ifaddr *ifp;
c2e21293 1291 struct hlist_node *node;
3a88a81d 1292 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1293
5c578aed 1294 rcu_read_lock_bh();
1295 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1296 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1297 continue;
1da177e4 1298 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1299 !(ifp->flags&IFA_F_TENTATIVE) &&
1300 (dev == NULL || ifp->idev->dev == dev ||
1301 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1302 rcu_read_unlock_bh();
1303 return 1;
1da177e4
LT		 1304 }
1305 }
5c578aed 1306
eedf042a
SH		 1307 rcu_read_unlock_bh();
1308 return 0;
1da177e4 1309}
7159039a
YH		 1310EXPORT_SYMBOL(ipv6_chk_addr);
1311
3e81c6da
DM		 1312static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1313 struct net_device *dev)
1da177e4 1314{
3e81c6da 1315 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1316 struct inet6_ifaddr *ifp;
1317 struct hlist_node *node;
1da177e4 1318
c2e21293 1319 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1320 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1321 continue;
1da177e4
LT		 1322 if (ipv6_addr_equal(&ifp->addr, addr)) {
1323 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1324 return true;
1da177e4
LT		 1325 }
1326 }
3e81c6da 1327 return false;
1da177e4
LT		 1328}
1329
52eeeb84
YH		 1330int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1331{
1332 struct inet6_dev *idev;
1333 struct inet6_ifaddr *ifa;
1334 int onlink;
1335
1336 onlink = 0;
1337 rcu_read_lock();
1338 idev = __in6_dev_get(dev);
1339 if (idev) {
1340 read_lock_bh(&idev->lock);
502a2ffd 1341 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1342 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1343 ifa->prefix_len);
1344 if (onlink)
1345 break;
1346 }
1347 read_unlock_bh(&idev->lock);
1348 }
1349 rcu_read_unlock();
1350 return onlink;
1351}
1352
1353EXPORT_SYMBOL(ipv6_chk_prefix);
1354
9acd9f3a 1355struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1356 struct net_device *dev, int strict)
1da177e4 1357{
b79d1d54 1358 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1359 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1360 struct hlist_node *node;
1da177e4 1361
5c578aed 1362 rcu_read_lock_bh();
4f70ecca 1363 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1364 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1365 continue;
1da177e4
LT		 1366 if (ipv6_addr_equal(&ifp->addr, addr)) {
1367 if (dev == NULL || ifp->idev->dev == dev ||
1368 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1369 result = ifp;
1da177e4
LT		 1370 in6_ifa_hold(ifp);
1371 break;
1372 }
1373 }
1374 }
5c578aed 1375 rcu_read_unlock_bh();
1da177e4 1376
b79d1d54 1377 return result;
1da177e4
LT		 1378}
1379
1da177e4
LT		 1380/* Gets referenced address, destroys ifaddr */
1381
cc411d0b 1382static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1383{
1da177e4
LT		 1384 if (ifp->flags&IFA_F_PERMANENT) {
1385 spin_lock_bh(&ifp->lock);
1386 addrconf_del_timer(ifp);
1387 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1388 if (dad_failed)
1389 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1390 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1391 if (dad_failed)
1392 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1393 in6_ifa_put(ifp);
1394#ifdef CONFIG_IPV6_PRIVACY
1395 } else if (ifp->flags&IFA_F_TEMPORARY) {
1396 struct inet6_ifaddr *ifpub;
1397 spin_lock_bh(&ifp->lock);
1398 ifpub = ifp->ifpub;
1399 if (ifpub) {
1400 in6_ifa_hold(ifpub);
1401 spin_unlock_bh(&ifp->lock);
1402 ipv6_create_tempaddr(ifpub, ifp);
1403 in6_ifa_put(ifpub);
1404 } else {
1405 spin_unlock_bh(&ifp->lock);
1406 }
1407 ipv6_del_addr(ifp);
1408#endif
1409 } else
1410 ipv6_del_addr(ifp);
1411}
1412
f2344a13
HX		 1413static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1414{
1415 int err = -ENOENT;
1416
1417 spin_lock(&ifp->state_lock);
1418 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1419 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1420 err = 0;
1421 }
1422 spin_unlock(&ifp->state_lock);
1423
1424 return err;
1425}
1426
3c21edbd
YH		 1427void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1428{
1b34be74 1429 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1430
853dc2e0
UB		 1431 if (addrconf_dad_end(ifp)) {
1432 in6_ifa_put(ifp);
f2344a13 1433 return;
853dc2e0 1434 }
f2344a13 1435
9bdd8d40 1436 if (net_ratelimit())
0522fea6
JR		 1437 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1438 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1439
1b34be74
YH		 1440 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1441 struct in6_addr addr;
1442
1443 addr.s6_addr32[0] = htonl(0xfe800000);
1444 addr.s6_addr32[1] = 0;
1445
1446 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1447 ipv6_addr_equal(&ifp->addr, &addr)) {
1448 /* DAD failed for link-local based on MAC address */
1449 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1450
1451 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1452 ifp->idev->dev->name);
1b34be74
YH		 1453 }
1454 }
1455
cc411d0b 1456 addrconf_dad_stop(ifp, 1);
3c21edbd 1457}
1da177e4
LT		 1458
1459/* Join to solicited addr multicast group. */
1460
1461void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1462{
1463 struct in6_addr maddr;
1464
1465 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1466 return;
1467
1468 addrconf_addr_solict_mult(addr, &maddr);
1469 ipv6_dev_mc_inc(dev, &maddr);
1470}
1471
1472void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1473{
1474 struct in6_addr maddr;
1475
1476 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1477 return;
1478
1479 addrconf_addr_solict_mult(addr, &maddr);
1480 __ipv6_dev_mc_dec(idev, &maddr);
1481}
1482
20380731 1483static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1484{
1485 struct in6_addr addr;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1490}
1491
20380731 1492static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1493{
1494 struct in6_addr addr;
1495 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1496 if (ipv6_addr_any(&addr))
1497 return;
1498 __ipv6_dev_ac_dec(ifp->idev, &addr);
1499}
1500
073a8e0e
YH		 1501static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1502{
1503 if (dev->addr_len != ETH_ALEN)
1504 return -1;
1505 memcpy(eui, dev->dev_addr, 3);
1506 memcpy(eui + 5, dev->dev_addr + 3, 3);
1507
1508 /*
1509 * The zSeries OSA network cards can be shared among various
1510 * OS instances, but the OSA cards have only one MAC address.
1511 * This leads to duplicate address conflicts in conjunction
1512 * with IPv6 if more than one instance uses the same card.
1513 *
1514 * The driver for these cards can deliver a unique 16-bit
1515 * identifier for each instance sharing the same card. It is
1516 * placed instead of 0xFFFE in the interface identifier. The
1517 * "u" bit of the interface identifier is not inverted in this
1518 * case. Hence the resulting interface identifier has local
1519 * scope according to RFC2373.
1520 */
1521 if (dev->dev_id) {
1522 eui[3] = (dev->dev_id >> 8) & 0xFF;
1523 eui[4] = dev->dev_id & 0xFF;
1524 } else {
1525 eui[3] = 0xFF;
1526 eui[4] = 0xFE;
1527 eui[0] ^= 2;
1528 }
1529 return 0;
1530}
1531
1532static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1533{
1534 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1535 if (dev->addr_len != ARCNET_ALEN)
1536 return -1;
1537 memset(eui, 0, 7);
1538 eui[7] = *(u8*)dev->dev_addr;
1539 return 0;
1540}
1541
1542static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1543{
1544 if (dev->addr_len != INFINIBAND_ALEN)
1545 return -1;
1546 memcpy(eui, dev->dev_addr + 12, 8);
1547 eui[0] |= 2;
1548 return 0;
1549}
1550
c61393ea 1551static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1552{
9af28511
SH		 1553 if (addr == 0)
1554 return -1;
dfd982ba
YH		 1555 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1556 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1557 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1558 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1559 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1560 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1561 eui[1] = 0;
1562 eui[2] = 0x5E;
1563 eui[3] = 0xFE;
1564 memcpy(eui + 4, &addr, 4);
1565 return 0;
1566}
dfd982ba
YH		 1567
1568static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1569{
1570 if (dev->priv_flags & IFF_ISATAP)
1571 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1572 return -1;
1573}
1574
1da177e4
LT		 1575static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1576{
1577 switch (dev->type) {
1578 case ARPHRD_ETHER:
1579 case ARPHRD_FDDI:
1580 case ARPHRD_IEEE802_TR:
073a8e0e 1581 return addrconf_ifid_eui48(eui, dev);
1da177e4 1582 case ARPHRD_ARCNET:
073a8e0e 1583 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1584 case ARPHRD_INFINIBAND:
073a8e0e 1585 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1586 case ARPHRD_SIT:
dfd982ba 1587 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1588 }
1589 return -1;
1590}
1591
1592static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1593{
1594 int err = -1;
1595 struct inet6_ifaddr *ifp;
1596
1597 read_lock_bh(&idev->lock);
502a2ffd 1598 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1599 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1600 memcpy(eui, ifp->addr.s6_addr+8, 8);
1601 err = 0;
1602 break;
1603 }
1604 }
1605 read_unlock_bh(&idev->lock);
1606 return err;
1607}
1608
1609#ifdef CONFIG_IPV6_PRIVACY
1610/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1611static int __ipv6_regen_rndid(struct inet6_dev *idev)
1612{
1da177e4 1613regen:
955189ef 1614 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1615 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1616
1617 /*
1618 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1619 * check if generated address is not inappropriate
1620 *
1621 * - Reserved subnet anycast (RFC 2526)
1622 * 11111101 11....11 1xxxxxxx
c7dc89c0 1623 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1624 * 00-00-5E-FE-xx-xx-xx-xx
1625 * - value 0
1626 * - XXX: already assigned to an address on the device
1627 */
1ab1457c 1628 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1629 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1630 (idev->rndid[7]&0x80))
1631 goto regen;
1632 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1633 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1634 goto regen;
1635 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1636 goto regen;
1637 }
1638
1639 return 0;
1640}
1641
1642static void ipv6_regen_rndid(unsigned long data)
1643{
1644 struct inet6_dev *idev = (struct inet6_dev *) data;
1645 unsigned long expires;
1646
8814c4b5 1647 rcu_read_lock_bh();
1da177e4
LT		 1648 write_lock_bh(&idev->lock);
1649
1650 if (idev->dead)
1651 goto out;
1652
1653 if (__ipv6_regen_rndid(idev) < 0)
1654 goto out;
1ab1457c 1655
1da177e4 1656 expires = jiffies +
1ab1457c 1657 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1658 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1659 idev->cnf.max_desync_factor * HZ;
1da177e4
LT		 1660 if (time_before(expires, jiffies)) {
1661 printk(KERN_WARNING
1662 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1663 idev->dev->name);
1664 goto out;
1665 }
1666
1667 if (!mod_timer(&idev->regen_timer, expires))
1668 in6_dev_hold(idev);
1669
1670out:
1671 write_unlock_bh(&idev->lock);
8814c4b5 1672 rcu_read_unlock_bh();
1da177e4
LT		 1673 in6_dev_put(idev);
1674}
1675
1676static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1677 int ret = 0;
1678
1679 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1680 ret = __ipv6_regen_rndid(idev);
1681 return ret;
1682}
1683#endif
1684
1685/*
1686 * Add prefix route.
1687 */
1688
1689static void
1690addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1691 unsigned long expires, u32 flags)
1da177e4 1692{
86872cb5
TG		 1693 struct fib6_config cfg = {
1694 .fc_table = RT6_TABLE_PREFIX,
1695 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1696 .fc_ifindex = dev->ifindex,
1697 .fc_expires = expires,
1698 .fc_dst_len = plen,
1699 .fc_flags = RTF_UP | flags,
c346dca1 1700 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1701 .fc_protocol = RTPROT_KERNEL,
86872cb5 1702 };
1da177e4 1703
86872cb5 1704 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1705
1706 /* Prevent useless cloning on PtP SIT.
1707 This thing is done here expecting that the whole
1708 class of non-broadcast devices need not cloning.
1709 */
0be669bb 1710#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1711 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1712 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1713#endif
1da177e4 1714
86872cb5 1715 ip6_route_add(&cfg);
1da177e4
LT		 1716}
1717
1718/* Create "default" multicast route to the interface */
1719
1720static void addrconf_add_mroute(struct net_device *dev)
1721{
86872cb5
TG		 1722 struct fib6_config cfg = {
1723 .fc_table = RT6_TABLE_LOCAL,
1724 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1725 .fc_ifindex = dev->ifindex,
1726 .fc_dst_len = 8,
1727 .fc_flags = RTF_UP,
c346dca1 1728 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1729 };
1730
1731 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1732
1733 ip6_route_add(&cfg);
1da177e4
LT		 1734}
1735
0be669bb 1736#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1737static void sit_route_add(struct net_device *dev)
1738{
86872cb5
TG		 1739 struct fib6_config cfg = {
1740 .fc_table = RT6_TABLE_MAIN,
1741 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1742 .fc_ifindex = dev->ifindex,
1743 .fc_dst_len = 96,
1744 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1745 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1746 };
1da177e4
LT		 1747
1748 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1749 ip6_route_add(&cfg);
1da177e4 1750}
0be669bb 1751#endif
1da177e4
LT		 1752
1753static void addrconf_add_lroute(struct net_device *dev)
1754{
1755 struct in6_addr addr;
1756
1757 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1758 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1759}
1760
1761static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1762{
1763 struct inet6_dev *idev;
1764
1765 ASSERT_RTNL();
1766
e21e8467
SH		 1767 idev = ipv6_find_idev(dev);
1768 if (!idev)
64e724f6
BH		 1769 return ERR_PTR(-ENOBUFS);
1770
1771 if (idev->cnf.disable_ipv6)
1772 return ERR_PTR(-EACCES);
1da177e4
LT		 1773
1774 /* Add default multicast route */
1775 addrconf_add_mroute(dev);
1776
1777 /* Add link local route */
1778 addrconf_add_lroute(dev);
1779 return idev;
1780}
1781
1782void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1783{
1784 struct prefix_info *pinfo;
1785 __u32 valid_lft;
1786 __u32 prefered_lft;
1787 int addr_type;
1da177e4 1788 struct inet6_dev *in6_dev;
56d417b1 1789 struct net *net = dev_net(dev);
1da177e4
LT		 1790
1791 pinfo = (struct prefix_info *) opt;
1ab1457c 1792
1da177e4
LT		 1793 if (len < sizeof(struct prefix_info)) {
1794 ADBG(("addrconf: prefix option too short\n"));
1795 return;
1796 }
1ab1457c 1797
1da177e4
LT		 1798 /*
1799 * Validation checks ([ADDRCONF], page 19)
1800 */
1801
1802 addr_type = ipv6_addr_type(&pinfo->prefix);
1803
1804 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1805 return;
1806
1807 valid_lft = ntohl(pinfo->valid);
1808 prefered_lft = ntohl(pinfo->prefered);
1809
1810 if (prefered_lft > valid_lft) {
1811 if (net_ratelimit())
1812 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1813 return;
1814 }
1815
1816 in6_dev = in6_dev_get(dev);
1817
1818 if (in6_dev == NULL) {
1819 if (net_ratelimit())
1820 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1821 return;
1822 }
1823
1824 /*
1825 * Two things going on here:
1826 * 1) Add routes for on-link prefixes
1827 * 2) Configure prefixes with the auto flag set
1828 */
1829
4bed72e4
YH		 1830 if (pinfo->onlink) {
1831 struct rt6_info *rt;
1832 unsigned long rt_expires;
1833
6f704992
YH		 1834 /* Avoid arithmetic overflow. Really, we could
1835 * save rt_expires in seconds, likely valid_lft,
1836 * but it would require division in fib gc, that it
1837 * not good.
1838 */
4bed72e4
YH		 1839 if (HZ > USER_HZ)
1840 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1841 else
1842 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1843
4bed72e4
YH		 1844 if (addrconf_finite_timeout(rt_expires))
1845 rt_expires *= HZ;
1da177e4 1846
56d417b1 1847 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1848 dev->ifindex, 1);
1da177e4 1849
2b5ead46 1850 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1851 /* Autoconf prefix route */
1852 if (valid_lft == 0) {
1853 ip6_del_rt(rt);
1854 rt = NULL;
4bed72e4 1855 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1856 /* not infinity */
1857 rt->rt6i_expires = jiffies + rt_expires;
1858 rt->rt6i_flags |= RTF_EXPIRES;
1859 } else {
1860 rt->rt6i_flags &= ~RTF_EXPIRES;
1861 rt->rt6i_expires = 0;
1da177e4
LT		 1862 }
1863 } else if (valid_lft) {
6f704992 1864 clock_t expires = 0;
4bed72e4
YH		 1865 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1866 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1867 /* not infinity */
1868 flags |= RTF_EXPIRES;
1869 expires = jiffies_to_clock_t(rt_expires);
1870 }
1da177e4 1871 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1872 dev, expires, flags);
1da177e4
LT		 1873 }
1874 if (rt)
d8d1f30b 1875 dst_release(&rt->dst);
1da177e4
LT		 1876 }
1877
1878 /* Try to figure out our local address for this prefix */
1879
1880 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1881 struct inet6_ifaddr * ifp;
1882 struct in6_addr addr;
1883 int create = 0, update_lft = 0;
1884
1885 if (pinfo->prefix_len == 64) {
1886 memcpy(&addr, &pinfo->prefix, 8);
1887 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1888 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1889 in6_dev_put(in6_dev);
1890 return;
1891 }
1892 goto ok;
1893 }
1894 if (net_ratelimit())
1895 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1896 pinfo->prefix_len);
1897 in6_dev_put(in6_dev);
1898 return;
1899
1900ok:
1901
53b7997f 1902 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1903
1904 if (ifp == NULL && valid_lft) {
1905 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1906 u32 addr_flags = 0;
1907
1908#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1909 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1910 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1911 addr_flags = IFA_F_OPTIMISTIC;
1912#endif
1da177e4
LT		 1913
1914 /* Do not allow to create too much of autoconfigured
1915 * addresses; this would be too easy way to crash kernel.
1916 */
1917 if (!max_addresses ||
1918 ipv6_count_addresses(in6_dev) < max_addresses)
1919 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1920 addr_type&IPV6_ADDR_SCOPE_MASK,
1921 addr_flags);
1da177e4
LT		 1922
1923 if (!ifp || IS_ERR(ifp)) {
1924 in6_dev_put(in6_dev);
1925 return;
1926 }
1927
1928 update_lft = create = 1;
1929 ifp->cstamp = jiffies;
1930 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1931 }
1932
1933 if (ifp) {
1934 int flags;
1935 unsigned long now;
1936#ifdef CONFIG_IPV6_PRIVACY
1937 struct inet6_ifaddr *ift;
1938#endif
1939 u32 stored_lft;
1940
1941 /* update lifetime (RFC2462 5.5.3 e) */
1942 spin_lock(&ifp->lock);
1943 now = jiffies;
1944 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1945 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1946 else
1947 stored_lft = 0;
1948 if (!update_lft && stored_lft) {
1949 if (valid_lft > MIN_VALID_LIFETIME ||
1950 valid_lft > stored_lft)
1951 update_lft = 1;
1952 else if (stored_lft <= MIN_VALID_LIFETIME) {
1953 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1954 /*
1955 * RFC 4862 Section 5.5.3e:
1956 * "Note that the preferred lifetime of
1957 * the corresponding address is always
1958 * reset to the Preferred Lifetime in
1959 * the received Prefix Information
1960 * option, regardless of whether the
1961 * valid lifetime is also reset or
1962 * ignored."
1963 *
1964 * So if the preferred lifetime in
1965 * this advertisement is different
1966 * than what we have stored, but the
1967 * valid lifetime is invalid, just
1968 * reset prefered_lft.
1969 *
1970 * We must set the valid lifetime
1971 * to the stored lifetime since we'll
1972 * be updating the timestamp below,
1973 * else we'll set it back to the
1974 * minumum.
1975 */
1976 if (prefered_lft != ifp->prefered_lft) {
1977 valid_lft = stored_lft;
1978 update_lft = 1;
1979 }
1da177e4
LT		 1980 } else {
1981 valid_lft = MIN_VALID_LIFETIME;
1982 if (valid_lft < prefered_lft)
1983 prefered_lft = valid_lft;
1984 update_lft = 1;
1985 }
1986 }
1987
1988 if (update_lft) {
1989 ifp->valid_lft = valid_lft;
1990 ifp->prefered_lft = prefered_lft;
1991 ifp->tstamp = now;
1992 flags = ifp->flags;
1993 ifp->flags &= ~IFA_F_DEPRECATED;
1994 spin_unlock(&ifp->lock);
1995
1996 if (!(flags&IFA_F_TENTATIVE))
1997 ipv6_ifa_notify(0, ifp);
1998 } else
1999 spin_unlock(&ifp->lock);
2000
2001#ifdef CONFIG_IPV6_PRIVACY
2002 read_lock_bh(&in6_dev->lock);
2003 /* update all temporary addresses in the list */
372e6c8f 2004 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 2005 /*
2006 * When adjusting the lifetimes of an existing
2007 * temporary address, only lower the lifetimes.
2008 * Implementations must not increase the
2009 * lifetimes of an existing temporary address
2010 * when processing a Prefix Information Option.
2011 */
c6fbfac2
BB		 2012 if (ifp != ift->ifpub)
2013 continue;
2014
1da177e4
LT		 2015 spin_lock(&ift->lock);
2016 flags = ift->flags;
2017 if (ift->valid_lft > valid_lft &&
2018 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2019 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2020 if (ift->prefered_lft > prefered_lft &&
2021 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2022 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2023 spin_unlock(&ift->lock);
2024 if (!(flags&IFA_F_TENTATIVE))
2025 ipv6_ifa_notify(0, ift);
2026 }
2027
aed65501 2028 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4
LT		 2029 /*
2030 * When a new public address is created as described in [ADDRCONF],
aed65501
GW		 2031 * also create a new temporary address. Also create a temporary
2032 * address if it's enabled but no temporary address currently exists.
1da177e4 2033 */
1ab1457c 2034 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2035 ipv6_create_tempaddr(ifp, NULL);
2036 } else {
2037 read_unlock_bh(&in6_dev->lock);
2038 }
2039#endif
2040 in6_ifa_put(ifp);
2041 addrconf_verify(0);
2042 }
2043 }
2044 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2045 in6_dev_put(in6_dev);
2046}
2047
2048/*
2049 * Set destination address.
2050 * Special case for SIT interfaces where we create a new "virtual"
2051 * device.
2052 */
af284937 2053int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2054{
2055 struct in6_ifreq ireq;
2056 struct net_device *dev;
2057 int err = -EINVAL;
2058
2059 rtnl_lock();
2060
2061 err = -EFAULT;
2062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2063 goto err_exit;
2064
af284937 2065 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2066
2067 err = -ENODEV;
2068 if (dev == NULL)
2069 goto err_exit;
2070
0be669bb 2071#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2072 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2073 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2074 struct ifreq ifr;
1da177e4
LT		 2075 struct ip_tunnel_parm p;
2076
2077 err = -EADDRNOTAVAIL;
2078 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2079 goto err_exit;
2080
2081 memset(&p, 0, sizeof(p));
2082 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2083 p.iph.saddr = 0;
2084 p.iph.version = 4;
2085 p.iph.ihl = 5;
2086 p.iph.protocol = IPPROTO_IPV6;
2087 p.iph.ttl = 64;
d20b3109 2088 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2089
5bc3eb7e
SH		 2090 if (ops->ndo_do_ioctl) {
2091 mm_segment_t oldfs = get_fs();
2092
2093 set_fs(KERNEL_DS);
2094 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2095 set_fs(oldfs);
2096 } else
2097 err = -EOPNOTSUPP;
1da177e4
LT		 2098
2099 if (err == 0) {
2100 err = -ENOBUFS;
af284937
DL		 2101 dev = __dev_get_by_name(net, p.name);
2102 if (!dev)
1da177e4
LT		 2103 goto err_exit;
2104 err = dev_open(dev);
2105 }
2106 }
0be669bb 2107#endif
1da177e4
LT		 2108
2109err_exit:
2110 rtnl_unlock();
2111 return err;
2112}
2113
2114/*
2115 * Manual configuration of address on an interface
2116 */
af284937 2117static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2118 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2119 __u32 valid_lft)
1da177e4
LT		 2120{
2121 struct inet6_ifaddr *ifp;
2122 struct inet6_dev *idev;
2123 struct net_device *dev;
2124 int scope;
6f704992
YH		 2125 u32 flags;
2126 clock_t expires;
4bed72e4 2127 unsigned long timeout;
1da177e4
LT		 2128
2129 ASSERT_RTNL();
1ab1457c 2130
24ef0da7
TG		 2131 if (plen > 128)
2132 return -EINVAL;
2133
0778769d
NT		 2134 /* check the lifetime */
2135 if (!valid_lft || prefered_lft > valid_lft)
2136 return -EINVAL;
2137
af284937
DL		 2138 dev = __dev_get_by_index(net, ifindex);
2139 if (!dev)
1da177e4 2140 return -ENODEV;
1ab1457c 2141
64e724f6
BH		 2142 idev = addrconf_add_dev(dev);
2143 if (IS_ERR(idev))
2144 return PTR_ERR(idev);
1da177e4
LT		 2145
2146 scope = ipv6_addr_scope(pfx);
2147
4bed72e4
YH		 2148 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2149 if (addrconf_finite_timeout(timeout)) {
2150 expires = jiffies_to_clock_t(timeout * HZ);
2151 valid_lft = timeout;
6f704992 2152 flags = RTF_EXPIRES;
4bed72e4
YH		 2153 } else {
2154 expires = 0;
2155 flags = 0;
2156 ifa_flags |= IFA_F_PERMANENT;
6f704992 2157 }
0778769d 2158
4bed72e4
YH		 2159 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2160 if (addrconf_finite_timeout(timeout)) {
2161 if (timeout == 0)
2162 ifa_flags |= IFA_F_DEPRECATED;
2163 prefered_lft = timeout;
2164 }
0778769d
NT		 2165
2166 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2167
1da177e4 2168 if (!IS_ERR(ifp)) {
06aebfb7 2169 spin_lock_bh(&ifp->lock);
0778769d
NT		 2170 ifp->valid_lft = valid_lft;
2171 ifp->prefered_lft = prefered_lft;
2172 ifp->tstamp = jiffies;
06aebfb7 2173 spin_unlock_bh(&ifp->lock);
0778769d 2174
46d48046 2175 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2176 expires, flags);
95c385b4
NH		 2177 /*
2178 * Note that section 3.1 of RFC 4429 indicates
2179 * that the Optimistic flag should not be set for
2180 * manually configured addresses
2181 */
1da177e4
LT		 2182 addrconf_dad_start(ifp, 0);
2183 in6_ifa_put(ifp);
0778769d 2184 addrconf_verify(0);
1da177e4
LT		 2185 return 0;
2186 }
2187
2188 return PTR_ERR(ifp);
2189}
2190
af284937 2191static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2192 unsigned int plen)
1da177e4
LT		 2193{
2194 struct inet6_ifaddr *ifp;
2195 struct inet6_dev *idev;
2196 struct net_device *dev;
1ab1457c 2197
24ef0da7
TG		 2198 if (plen > 128)
2199 return -EINVAL;
2200
af284937
DL		 2201 dev = __dev_get_by_index(net, ifindex);
2202 if (!dev)
1da177e4
LT		 2203 return -ENODEV;
2204
2205 if ((idev = __in6_dev_get(dev)) == NULL)
2206 return -ENXIO;
2207
2208 read_lock_bh(&idev->lock);
502a2ffd 2209 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2210 if (ifp->prefix_len == plen &&
2211 ipv6_addr_equal(pfx, &ifp->addr)) {
2212 in6_ifa_hold(ifp);
2213 read_unlock_bh(&idev->lock);
1ab1457c 2214
1da177e4
LT		 2215 ipv6_del_addr(ifp);
2216
2217 /* If the last address is deleted administratively,
2218 disable IPv6 on this interface.
2219 */
502a2ffd 2220 if (list_empty(&idev->addr_list))
1da177e4
LT		 2221 addrconf_ifdown(idev->dev, 1);
2222 return 0;
2223 }
2224 }
2225 read_unlock_bh(&idev->lock);
2226 return -EADDRNOTAVAIL;
2227}
2228
2229
af284937 2230int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2231{
2232 struct in6_ifreq ireq;
2233 int err;
1ab1457c 2234
1da177e4
LT		 2235 if (!capable(CAP_NET_ADMIN))
2236 return -EPERM;
1ab1457c 2237
1da177e4
LT		 2238 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2239 return -EFAULT;
2240
2241 rtnl_lock();
af284937
DL		 2242 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2243 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2244 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2245 rtnl_unlock();
2246 return err;
2247}
2248
af284937 2249int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2250{
2251 struct in6_ifreq ireq;
2252 int err;
1ab1457c 2253
1da177e4
LT		 2254 if (!capable(CAP_NET_ADMIN))
2255 return -EPERM;
2256
2257 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2258 return -EFAULT;
2259
2260 rtnl_lock();
af284937
DL		 2261 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2262 ireq.ifr6_prefixlen);
1da177e4
LT		 2263 rtnl_unlock();
2264 return err;
2265}
2266
b5f348e5
IJ		 2267static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2268 int plen, int scope)
2269{
2270 struct inet6_ifaddr *ifp;
2271
2272 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2273 if (!IS_ERR(ifp)) {
2274 spin_lock_bh(&ifp->lock);
2275 ifp->flags &= ~IFA_F_TENTATIVE;
2276 spin_unlock_bh(&ifp->lock);
2277 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2278 in6_ifa_put(ifp);
2279 }
2280}
2281
0be669bb 2282#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2283static void sit_add_v4_addrs(struct inet6_dev *idev)
2284{
1da177e4
LT		 2285 struct in6_addr addr;
2286 struct net_device *dev;
c346dca1 2287 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2288 int scope;
2289
2290 ASSERT_RTNL();
2291
2292 memset(&addr, 0, sizeof(struct in6_addr));
2293 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2294
2295 if (idev->dev->flags&IFF_POINTOPOINT) {
2296 addr.s6_addr32[0] = htonl(0xfe800000);
2297 scope = IFA_LINK;
2298 } else {
2299 scope = IPV6_ADDR_COMPATv4;
2300 }
2301
2302 if (addr.s6_addr32[3]) {
b5f348e5 2303 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2304 return;
2305 }
2306
6fda7350 2307 for_each_netdev(net, dev) {
e5ed6399 2308 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2309 if (in_dev && (dev->flags & IFF_UP)) {
2310 struct in_ifaddr * ifa;
2311
2312 int flag = scope;
2313
2314 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2315 int plen;
2316
2317 addr.s6_addr32[3] = ifa->ifa_local;
2318
2319 if (ifa->ifa_scope == RT_SCOPE_LINK)
2320 continue;
2321 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2322 if (idev->dev->flags&IFF_POINTOPOINT)
2323 continue;
2324 flag |= IFA_HOST;
2325 }
2326 if (idev->dev->flags&IFF_POINTOPOINT)
2327 plen = 64;
2328 else
2329 plen = 96;
2330
b5f348e5 2331 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2332 }
2333 }
1ab1457c 2334 }
1da177e4 2335}
0be669bb 2336#endif
1da177e4
LT		 2337
2338static void init_loopback(struct net_device *dev)
2339{
2340 struct inet6_dev *idev;
1da177e4
LT		 2341
2342 /* ::1 */
2343
2344 ASSERT_RTNL();
2345
2346 if ((idev = ipv6_find_idev(dev)) == NULL) {
2347 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2348 return;
2349 }
2350
b5f348e5 2351 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2352}
2353
2354static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2355{
2356 struct inet6_ifaddr * ifp;
95c385b4
NH		 2357 u32 addr_flags = IFA_F_PERMANENT;
2358
2359#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2360 if (idev->cnf.optimistic_dad &&
702beb87 2361 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2362 addr_flags |= IFA_F_OPTIMISTIC;
2363#endif
1da177e4 2364
95c385b4
NH		 2365
2366 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2367 if (!IS_ERR(ifp)) {
46d48046 2368 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2369 addrconf_dad_start(ifp, 0);
2370 in6_ifa_put(ifp);
2371 }
2372}
2373
2374static void addrconf_dev_config(struct net_device *dev)
2375{
2376 struct in6_addr addr;
2377 struct inet6_dev * idev;
2378
2379 ASSERT_RTNL();
2380
74235a25
HX		 2381 if ((dev->type != ARPHRD_ETHER) &&
2382 (dev->type != ARPHRD_FDDI) &&
2383 (dev->type != ARPHRD_IEEE802_TR) &&
2384 (dev->type != ARPHRD_ARCNET) &&
2385 (dev->type != ARPHRD_INFINIBAND)) {
2386 /* Alas, we support only Ethernet autoconfiguration. */
2387 return;
2388 }
2389
1da177e4 2390 idev = addrconf_add_dev(dev);
64e724f6 2391 if (IS_ERR(idev))
1da177e4
LT		 2392 return;
2393
2394 memset(&addr, 0, sizeof(struct in6_addr));
2395 addr.s6_addr32[0] = htonl(0xFE800000);
2396
2397 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2398 addrconf_add_linklocal(idev, &addr);
2399}
2400
0be669bb 2401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2402static void addrconf_sit_config(struct net_device *dev)
2403{
2404 struct inet6_dev *idev;
2405
2406 ASSERT_RTNL();
2407
1ab1457c
YH		 2408 /*
2409 * Configure the tunnel with one of our IPv4
2410 * addresses... we should configure all of
1da177e4
LT		 2411 * our v4 addrs in the tunnel
2412 */
2413
2414 if ((idev = ipv6_find_idev(dev)) == NULL) {
2415 printk(KERN_DEBUG "init sit: add_dev failed\n");
2416 return;
2417 }
2418
c7dc89c0
FT		 2419 if (dev->priv_flags & IFF_ISATAP) {
2420 struct in6_addr addr;
2421
2422 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2423 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2424 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2425 addrconf_add_linklocal(idev, &addr);
2426 return;
2427 }
2428
1da177e4
LT		 2429 sit_add_v4_addrs(idev);
2430
2431 if (dev->flags&IFF_POINTOPOINT) {
2432 addrconf_add_mroute(dev);
2433 addrconf_add_lroute(dev);
2434 } else
2435 sit_route_add(dev);
2436}
0be669bb 2437#endif
1da177e4
LT		 2438
2439static inline int
2440ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2441{
2442 struct in6_addr lladdr;
2443
95c385b4 2444 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2445 addrconf_add_linklocal(idev, &lladdr);
2446 return 0;
2447 }
2448 return -1;
2449}
2450
2451static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2452{
2453 struct net_device *link_dev;
c346dca1 2454 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2455
2456 /* first try to inherit the link-local address from the link device */
2457 if (idev->dev->iflink &&
6fda7350 2458 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2459 if (!ipv6_inherit_linklocal(idev, link_dev))
2460 return;
2461 }
2462 /* then try to inherit it from any device */
6fda7350 2463 for_each_netdev(net, link_dev) {
1da177e4
LT		 2464 if (!ipv6_inherit_linklocal(idev, link_dev))
2465 return;
2466 }
2467 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2468}
2469
2470/*
2471 * Autoconfigure tunnel with a link-local address so routing protocols,
2472 * DHCPv6, MLD etc. can be run over the virtual link
2473 */
2474
2475static void addrconf_ip6_tnl_config(struct net_device *dev)
2476{
2477 struct inet6_dev *idev;
2478
2479 ASSERT_RTNL();
2480
e21e8467 2481 idev = addrconf_add_dev(dev);
64e724f6 2482 if (IS_ERR(idev)) {
1da177e4
LT		 2483 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2484 return;
2485 }
2486 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2487}
2488
1ab1457c 2489static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2490 void * data)
2491{
2492 struct net_device *dev = (struct net_device *) data;
74235a25 2493 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2494 int run_pending = 0;
b217d616 2495 int err;
1da177e4 2496
e21e8467 2497 switch (event) {
45ba9dd2 2498 case NETDEV_REGISTER:
74235a25 2499 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2500 idev = ipv6_add_dev(dev);
2501 if (!idev)
b217d616 2502 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2503 }
2504 break;
bcdd553f 2505
1da177e4 2506 case NETDEV_UP:
3c21edbd 2507 case NETDEV_CHANGE:
c2edacf8
JV		 2508 if (dev->flags & IFF_SLAVE)
2509 break;
2510
3c21edbd 2511 if (event == NETDEV_UP) {
f24e3d65 2512 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2513 /* device is not ready yet. */
2514 printk(KERN_INFO
2515 "ADDRCONF(NETDEV_UP): %s: "
2516 "link is not ready\n",
2517 dev->name);
2518 break;
2519 }
99081049 2520
d31c7b8f
EP		 2521 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2522 idev = ipv6_add_dev(dev);
2523
e3ec6cfc 2524 if (idev) {
99081049 2525 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2526 run_pending = 1;
2527 }
3c21edbd 2528 } else {
f24e3d65 2529 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2530 /* device is still not ready. */
2531 break;
2532 }
2533
2534 if (idev) {
bcdd553f 2535 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2536 /* device is already configured. */
2537 break;
3c21edbd
YH		 2538 idev->if_flags |= IF_READY;
2539 }
2540
2541 printk(KERN_INFO
2542 "ADDRCONF(NETDEV_CHANGE): %s: "
2543 "link becomes ready\n",
2544 dev->name);
2545
c5e33bdd 2546 run_pending = 1;
3c21edbd
YH		 2547 }
2548
e21e8467 2549 switch (dev->type) {
0be669bb 2550#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2551 case ARPHRD_SIT:
2552 addrconf_sit_config(dev);
2553 break;
0be669bb 2554#endif
1da177e4
LT		 2555 case ARPHRD_TUNNEL6:
2556 addrconf_ip6_tnl_config(dev);
2557 break;
2558 case ARPHRD_LOOPBACK:
2559 init_loopback(dev);
2560 break;
2561
2562 default:
2563 addrconf_dev_config(dev);
2564 break;
3ff50b79 2565 }
bcdd553f 2566
1da177e4 2567 if (idev) {
c5e33bdd
YH		 2568 if (run_pending)
2569 addrconf_dad_run(idev);
2570
bcdd553f
SH		 2571 /*
2572 * If the MTU changed during the interface down,
2573 * when the interface up, the changed MTU must be
2574 * reflected in the idev as well as routers.
1da177e4 2575 */
bcdd553f
SH		 2576 if (idev->cnf.mtu6 != dev->mtu &&
2577 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2578 rt6_mtu_change(dev, dev->mtu);
2579 idev->cnf.mtu6 = dev->mtu;
2580 }
2581 idev->tstamp = jiffies;
2582 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2583
2584 /*
2585 * If the changed mtu during down is lower than
2586 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2587 */
2588 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2589 addrconf_ifdown(dev, 1);
1da177e4
LT		 2590 }
2591 break;
2592
2593 case NETDEV_CHANGEMTU:
d31c7b8f 2594 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2595 rt6_mtu_change(dev, dev->mtu);
2596 idev->cnf.mtu6 = dev->mtu;
2597 break;
2598 }
2599
d31c7b8f
EP		 2600 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2601 idev = ipv6_add_dev(dev);
2602 if (idev)
2603 break;
2604 }
2605
bcdd553f
SH		 2606 /*
2607 * MTU falled under IPV6_MIN_MTU.
2608 * Stop IPv6 on this interface.
2609 */
1da177e4
LT		 2610
2611 case NETDEV_DOWN:
2612 case NETDEV_UNREGISTER:
2613 /*
2614 * Remove all addresses from this interface.
2615 */
2616 addrconf_ifdown(dev, event != NETDEV_DOWN);
2617 break;
3c21edbd 2618
1da177e4 2619 case NETDEV_CHANGENAME:
1da177e4 2620 if (idev) {
5632c515 2621 snmp6_unregister_dev(idev);
408c4768 2622 addrconf_sysctl_unregister(idev);
f52295a9 2623 addrconf_sysctl_register(idev);
b217d616
HX		 2624 err = snmp6_register_dev(idev);
2625 if (err)
2626 return notifier_from_errno(err);
5632c515 2627 }
1da177e4 2628 break;
bcdd553f 2629
93d9b7d7
JP		 2630 case NETDEV_PRE_TYPE_CHANGE:
2631 case NETDEV_POST_TYPE_CHANGE:
2632 addrconf_type_change(dev, event);
75c78500 2633 break;
3ff50b79 2634 }
1da177e4
LT		 2635
2636 return NOTIFY_OK;
2637}
2638
2639/*
2640 * addrconf module should be notified of a device going up
2641 */
2642static struct notifier_block ipv6_dev_notf = {
2643 .notifier_call = addrconf_notify,
1da177e4
LT		 2644};
2645
93d9b7d7 2646static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2647{
2648 struct inet6_dev *idev;
2649 ASSERT_RTNL();
2650
2651 idev = __in6_dev_get(dev);
2652
93d9b7d7 2653 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2654 ipv6_mc_remap(idev);
93d9b7d7 2655 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2656 ipv6_mc_unmap(idev);
2657}
2658
1da177e4
LT		 2659static int addrconf_ifdown(struct net_device *dev, int how)
2660{
c346dca1 2661 struct net *net = dev_net(dev);
502a2ffd 2662 struct inet6_dev *idev;
2663 struct inet6_ifaddr *ifa;
2664 LIST_HEAD(keep_list);
4c5ff6a6 2665 int state;
1da177e4
LT		 2666
2667 ASSERT_RTNL();
2668
29ba5fed 2669 /* Flush routes if device is being removed or it is not loopback */
2670 if (how || !(dev->flags & IFF_LOOPBACK))
2671 rt6_ifdown(net, dev);
1da177e4
LT		 2672
2673 idev = __in6_dev_get(dev);
2674 if (idev == NULL)
2675 return -ENODEV;
2676
bcdd553f
SH		 2677 /*
2678 * Step 1: remove reference to ipv6 device from parent device.
2679 * Do not dev_put!
1da177e4 2680 */
439e2385 2681 if (how) {
1da177e4 2682 idev->dead = 1;
8814c4b5
YH		 2683
2684 /* protected by rtnl_lock */
2685 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2686
2687 /* Step 1.5: remove snmp6 entry */
2688 snmp6_unregister_dev(idev);
2689
2690 }
2691
1da177e4
LT		 2692 write_lock_bh(&idev->lock);
2693
bcdd553f 2694 /* Step 2: clear flags for stateless addrconf */
439e2385 2695 if (!how)
3c21edbd 2696 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2697
1da177e4 2698#ifdef CONFIG_IPV6_PRIVACY
439e2385 2699 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2700 in6_dev_put(idev);
2701
bcdd553f 2702 /* Step 3: clear tempaddr list */
372e6c8f 2703 while (!list_empty(&idev->tempaddr_list)) {
2704 ifa = list_first_entry(&idev->tempaddr_list,
2705 struct inet6_ifaddr, tmp_list);
2706 list_del(&ifa->tmp_list);
1da177e4
LT		 2707 write_unlock_bh(&idev->lock);
2708 spin_lock_bh(&ifa->lock);
2709
2710 if (ifa->ifpub) {
2711 in6_ifa_put(ifa->ifpub);
2712 ifa->ifpub = NULL;
2713 }
2714 spin_unlock_bh(&ifa->lock);
2715 in6_ifa_put(ifa);
2716 write_lock_bh(&idev->lock);
2717 }
2718#endif
8f37ada5 2719
502a2ffd 2720 while (!list_empty(&idev->addr_list)) {
2721 ifa = list_first_entry(&idev->addr_list,
2722 struct inet6_ifaddr, if_list);
84e8b803 2723 addrconf_del_timer(ifa);
2724
2725 /* If just doing link down, and address is permanent
2726 and not link-local, then retain it. */
bcdd553f 2727 if (!how &&
84e8b803 2728 (ifa->flags&IFA_F_PERMANENT) &&
2729 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2730 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2731
84e8b803 2732 /* If not doing DAD on this address, just keep it. */
2733 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2734 idev->cnf.accept_dad <= 0 ||
2735 (ifa->flags & IFA_F_NODAD))
2736 continue;
2737
2738 /* If it was tentative already, no need to notify */
2739 if (ifa->flags & IFA_F_TENTATIVE)
2740 continue;
2741
2742 /* Flag it for later restoration when link comes up */
2743 ifa->flags |= IFA_F_TENTATIVE;
f2344a13 2744 ifa->state = INET6_IFADDR_STATE_DAD;
dc2b99f7 2745 } else {
502a2ffd 2746 list_del(&ifa->if_list);
1da177e4 2747
27bdb2ab 2748 /* clear hash table */
2749 spin_lock_bh(&addrconf_hash_lock);
2750 hlist_del_init_rcu(&ifa->addr_lst);
27bdb2ab 2751 spin_unlock_bh(&addrconf_hash_lock);
4c5ff6a6
HX		 2752
2753 write_unlock_bh(&idev->lock);
2754 spin_lock_bh(&ifa->state_lock);
2755 state = ifa->state;
2756 ifa->state = INET6_IFADDR_STATE_DEAD;
2757 spin_unlock_bh(&ifa->state_lock);
2758
9d82ca98 2759 if (state != INET6_IFADDR_STATE_DEAD) {
2de79570
LC		 2760 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2761 atomic_notifier_call_chain(&inet6addr_chain,
2762 NETDEV_DOWN, ifa);
2763 }
9d82ca98
JF		 2764
2765 in6_ifa_put(ifa);
2de79570 2766 write_lock_bh(&idev->lock);
27bdb2ab 2767 }
1da177e4 2768 }
8f37ada5 2769
502a2ffd 2770 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2771
1da177e4
LT		 2772 write_unlock_bh(&idev->lock);
2773
2774 /* Step 5: Discard multicast list */
439e2385 2775 if (how)
1da177e4
LT		 2776 ipv6_mc_destroy_dev(idev);
2777 else
2778 ipv6_mc_down(idev);
2779
1da177e4 2780 idev->tstamp = jiffies;
1ab1457c 2781
bcdd553f 2782 /* Last: Shot the device (if unregistered) */
439e2385 2783 if (how) {
408c4768 2784 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2785 neigh_parms_release(&nd_tbl, idev->nd_parms);
2786 neigh_ifdown(&nd_tbl, dev);
2787 in6_dev_put(idev);
2788 }
2789 return 0;
2790}
2791
2792static void addrconf_rs_timer(unsigned long data)
2793{
2794 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2795 struct inet6_dev *idev = ifp->idev;
1da177e4 2796
5b2a1953 2797 read_lock(&idev->lock);
2798 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2799 goto out;
2800
5b2a1953 2801 if (idev->cnf.forwarding)
2802 goto out;
2803
2804 /* Announcement received after solicitation was sent */
2805 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2806 goto out;
1da177e4
LT		 2807
2808 spin_lock(&ifp->lock);
5b2a1953 2809 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2810 /* The wait after the last probe can be shorter */
2811 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2812 (ifp->probes == idev->cnf.rtr_solicits) ?
2813 idev->cnf.rtr_solicit_delay :
2814 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2815 spin_unlock(&ifp->lock);
2816
5b2a1953 2817 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2818 } else {
2819 spin_unlock(&ifp->lock);
2820 /*
2821 * Note: we do not support deprecated "all on-link"
2822 * assumption any longer.
2823 */
2824 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2825 idev->dev->name);
1da177e4
LT		 2826 }
2827
2828out:
5b2a1953 2829 read_unlock(&idev->lock);
1da177e4
LT		 2830 in6_ifa_put(ifp);
2831}
2832
2833/*
2834 * Duplicate Address Detection
2835 */
3c21edbd
YH		 2836static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2837{
2838 unsigned long rand_num;
2839 struct inet6_dev *idev = ifp->idev;
2840
95c385b4
NH		 2841 if (ifp->flags & IFA_F_OPTIMISTIC)
2842 rand_num = 0;
2843 else
2844 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2845
3c21edbd
YH		 2846 ifp->probes = idev->cnf.dad_transmits;
2847 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2848}
2849
e431b8c0 2850static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2851{
2852 struct inet6_dev *idev = ifp->idev;
2853 struct net_device *dev = idev->dev;
1da177e4
LT		 2854
2855 addrconf_join_solict(dev, &ifp->addr);
2856
1da177e4 2857 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2858
2859 read_lock_bh(&idev->lock);
622ccdf1 2860 spin_lock(&ifp->lock);
e9d3e084 2861 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2862 goto out;
1da177e4
LT		 2863
2864 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2865 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2866 !(ifp->flags&IFA_F_TENTATIVE) ||
2867 ifp->flags & IFA_F_NODAD) {
cc411d0b 2868 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2869 spin_unlock(&ifp->lock);
1da177e4
LT		 2870 read_unlock_bh(&idev->lock);
2871
2872 addrconf_dad_completed(ifp);
2873 return;
2874 }
2875
6732bade 2876 if (!(idev->if_flags & IF_READY)) {
21809faf 2877 spin_unlock(&ifp->lock);
6732bade 2878 read_unlock_bh(&idev->lock);
3c21edbd 2879 /*
590a9887 2880 * If the device is not ready:
3c21edbd
YH		 2881 * - keep it tentative if it is a permanent address.
2882 * - otherwise, kill it.
2883 */
2884 in6_ifa_hold(ifp);
cc411d0b 2885 addrconf_dad_stop(ifp, 0);
6732bade 2886 return;
3c21edbd 2887 }
95c385b4
NH		 2888
2889 /*
2890 * Optimistic nodes can start receiving
2891 * Frames right away
2892 */
e21e8467 2893 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2894 ip6_ins_rt(ifp->rt);
2895
6732bade 2896 addrconf_dad_kick(ifp);
1da177e4 2897out:
622ccdf1 2898 spin_unlock(&ifp->lock);
1da177e4
LT		 2899 read_unlock_bh(&idev->lock);
2900}
2901
2902static void addrconf_dad_timer(unsigned long data)
2903{
2904 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2905 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2906 struct in6_addr mcaddr;
2907
f2344a13
HX		 2908 if (!ifp->probes && addrconf_dad_end(ifp))
2909 goto out;
2910
122e4519 2911 read_lock(&idev->lock);
2912 if (idev->dead || !(idev->if_flags & IF_READY)) {
2913 read_unlock(&idev->lock);
1da177e4
LT		 2914 goto out;
2915 }
21809faf 2916
2917 spin_lock(&ifp->lock);
622ccdf1
HX		 2918 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2919 spin_unlock(&ifp->lock);
2920 read_unlock(&idev->lock);
2921 goto out;
2922 }
2923
1da177e4
LT		 2924 if (ifp->probes == 0) {
2925 /*
2926 * DAD was successful
2927 */
2928
cc411d0b 2929 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2930 spin_unlock(&ifp->lock);
122e4519 2931 read_unlock(&idev->lock);
1da177e4
LT		 2932
2933 addrconf_dad_completed(ifp);
2934
2935 goto out;
2936 }
2937
2938 ifp->probes--;
2939 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2940 spin_unlock(&ifp->lock);
122e4519 2941 read_unlock(&idev->lock);
1da177e4
LT		 2942
2943 /* send a neighbour solicitation for our addr */
1da177e4 2944 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2945 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2946out:
2947 in6_ifa_put(ifp);
2948}
2949
2950static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2951{
e21e8467 2952 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2953
2954 /*
2955 * Configure the address for reception. Now it is valid.
2956 */
2957
2958 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2959
2960 /* If added prefix is link local and forwarding is off,
2961 start sending router solicitations.
2962 */
2963
c3bccac2
TG		 2964 if ((ifp->idev->cnf.forwarding == 0 ||
2965 ifp->idev->cnf.forwarding == 2) &&
1da177e4
LT		 2966 ifp->idev->cnf.rtr_solicits > 0 &&
2967 (dev->flags&IFF_LOOPBACK) == 0 &&
2968 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2969 /*
2970 * If a host as already performed a random delay
2971 * [...] as part of DAD [...] there is no need
2972 * to delay again before sending the first RS
2973 */
f3ee4010 2974 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2975
2976 spin_lock_bh(&ifp->lock);
2977 ifp->probes = 1;
2978 ifp->idev->if_flags |= IF_RS_SENT;
2979 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2980 spin_unlock_bh(&ifp->lock);
2981 }
2982}
2983
e21e8467
SH		 2984static void addrconf_dad_run(struct inet6_dev *idev)
2985{
c5e33bdd
YH		 2986 struct inet6_ifaddr *ifp;
2987
2988 read_lock_bh(&idev->lock);
502a2ffd 2989 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2990 spin_lock(&ifp->lock);
f2344a13
HX		 2991 if (ifp->flags & IFA_F_TENTATIVE &&
2992 ifp->state == INET6_IFADDR_STATE_DAD)
2993 addrconf_dad_kick(ifp);
21809faf 2994 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2995 }
2996 read_unlock_bh(&idev->lock);
2997}
2998
1da177e4
LT		 2999#ifdef CONFIG_PROC_FS
3000struct if6_iter_state {
3c40090a 3001 struct seq_net_private p;
1da177e4
LT		 3002 int bucket;
3003};
3004
3005static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3006{
3007 struct inet6_ifaddr *ifa = NULL;
3008 struct if6_iter_state *state = seq->private;
1218854a 3009 struct net *net = seq_file_net(seq);
1da177e4
LT		 3010
3011 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3012 struct hlist_node *n;
4f70ecca 3013 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 3014 addr_lst)
c2e21293 3015 if (net_eq(dev_net(ifa->idev->dev), net))
3016 return ifa;
1da177e4 3017 }
c2e21293 3018 return NULL;
1da177e4
LT		 3019}
3020
c2e21293 3021static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3022 struct inet6_ifaddr *ifa)
1da177e4
LT		 3023{
3024 struct if6_iter_state *state = seq->private;
1218854a 3025 struct net *net = seq_file_net(seq);
c2e21293 3026 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3027
4f70ecca 3028 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 3029 if (net_eq(dev_net(ifa->idev->dev), net))
3030 return ifa;
3c40090a 3031
c2e21293 3032 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3033 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3034 &inet6_addr_lst[state->bucket], addr_lst) {
3035 if (net_eq(dev_net(ifa->idev->dev), net))
3036 return ifa;
3037 }
1da177e4 3038 }
3c40090a 3039
c2e21293 3040 return NULL;
1da177e4
LT		 3041}
3042
3043static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3044{
3045 struct inet6_ifaddr *ifa = if6_get_first(seq);
3046
3047 if (ifa)
e21e8467 3048 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3049 --pos;
3050 return pos ? NULL : ifa;
3051}
3052
3053static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3054 __acquires(rcu_bh)
1da177e4 3055{
5c578aed 3056 rcu_read_lock_bh();
1da177e4
LT		 3057 return if6_get_idx(seq, *pos);
3058}
3059
3060static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3061{
3062 struct inet6_ifaddr *ifa;
3063
3064 ifa = if6_get_next(seq, v);
3065 ++*pos;
3066 return ifa;
3067}
3068
3069static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3070 __releases(rcu_bh)
1da177e4 3071{
5c578aed 3072 rcu_read_unlock_bh();
1da177e4
LT		 3073}
3074
3075static int if6_seq_show(struct seq_file *seq, void *v)
3076{
3077 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3078 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3079 &ifp->addr,
1da177e4
LT		 3080 ifp->idev->dev->ifindex,
3081 ifp->prefix_len,
3082 ifp->scope,
3083 ifp->flags,
3084 ifp->idev->dev->name);
3085 return 0;
3086}
3087
56b3d975 3088static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3089 .start = if6_seq_start,
3090 .next = if6_seq_next,
3091 .show = if6_seq_show,
3092 .stop = if6_seq_stop,
3093};
3094
3095static int if6_seq_open(struct inode *inode, struct file *file)
3096{
3c40090a
DL		 3097 return seq_open_net(inode, file, &if6_seq_ops,
3098 sizeof(struct if6_iter_state));
1da177e4
LT		 3099}
3100
9a32144e 3101static const struct file_operations if6_fops = {
1da177e4
LT		 3102 .owner = THIS_MODULE,
3103 .open = if6_seq_open,
3104 .read = seq_read,
3105 .llseek = seq_lseek,
3c40090a 3106 .release = seq_release_net,
1da177e4
LT		 3107};
3108
2c8c1e72 3109static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3110{
3c40090a 3111 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3112 return -ENOMEM;
3113 return 0;
3114}
3115
2c8c1e72 3116static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3117{
3118 proc_net_remove(net, "if_inet6");
3119}
3120
3121static struct pernet_operations if6_proc_net_ops = {
3122 .init = if6_proc_net_init,
3123 .exit = if6_proc_net_exit,
3124};
3125
3126int __init if6_proc_init(void)
3127{
3128 return register_pernet_subsys(&if6_proc_net_ops);
3129}
3130
1da177e4
LT		 3131void if6_proc_exit(void)
3132{
3c40090a 3133 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3134}
3135#endif /* CONFIG_PROC_FS */
3136
59fbb3a6 3137#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3138/* Check if address is a home address configured on any interface. */
389f6612 3139int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3140{
3141 int ret = 0;
c2e21293 3142 struct inet6_ifaddr *ifp = NULL;
3143 struct hlist_node *n;
3a88a81d 3144 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3145
5c578aed 3146 rcu_read_lock_bh();
4f70ecca 3147 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3148 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3149 continue;
caad295f 3150 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3151 (ifp->flags & IFA_F_HOMEADDRESS)) {
3152 ret = 1;
3153 break;
3154 }
3155 }
5c578aed 3156 rcu_read_unlock_bh();
3b9f9a1c
NT		 3157 return ret;
3158}
3159#endif
3160
1da177e4
LT		 3161/*
3162 * Periodic address status verification
3163 */
3164
3165static void addrconf_verify(unsigned long foo)
3166{
b2db7564 3167 unsigned long now, next, next_sec, next_sched;
1da177e4 3168 struct inet6_ifaddr *ifp;
c2e21293 3169 struct hlist_node *node;
1da177e4
LT		 3170 int i;
3171
5c578aed 3172 rcu_read_lock_bh();
3173 spin_lock(&addrconf_verify_lock);
1da177e4 3174 now = jiffies;
b2db7564 3175 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3176
3177 del_timer(&addr_chk_timer);
3178
bcdd553f 3179 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3180restart:
4f70ecca 3181 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3182 &inet6_addr_lst[i], addr_lst) {
1da177e4 3183 unsigned long age;
1da177e4
LT		 3184
3185 if (ifp->flags & IFA_F_PERMANENT)
3186 continue;
3187
3188 spin_lock(&ifp->lock);
b2db7564
YH		 3189 /* We try to batch several events at once. */
3190 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3191
8f27ebb9
YH		 3192 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3193 age >= ifp->valid_lft) {
1da177e4
LT		 3194 spin_unlock(&ifp->lock);
3195 in6_ifa_hold(ifp);
1da177e4
LT		 3196 ipv6_del_addr(ifp);
3197 goto restart;
8f27ebb9
YH		 3198 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3199 spin_unlock(&ifp->lock);
3200 continue;
1da177e4 3201 } else if (age >= ifp->prefered_lft) {
a1ed0526 3202 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3203 int deprecate = 0;
3204
3205 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3206 deprecate = 1;
3207 ifp->flags |= IFA_F_DEPRECATED;
3208 }
3209
3210 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3211 next = ifp->tstamp + ifp->valid_lft * HZ;
3212
3213 spin_unlock(&ifp->lock);
3214
3215 if (deprecate) {
3216 in6_ifa_hold(ifp);
1da177e4
LT		 3217
3218 ipv6_ifa_notify(0, ifp);
3219 in6_ifa_put(ifp);
3220 goto restart;
3221 }
3222#ifdef CONFIG_IPV6_PRIVACY
3223 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3224 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3225 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3226 ifp->idev->cnf.dad_transmits *
3227 ifp->idev->nd_parms->retrans_time / HZ;
3228
1da177e4
LT		 3229 if (age >= ifp->prefered_lft - regen_advance) {
3230 struct inet6_ifaddr *ifpub = ifp->ifpub;
3231 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3232 next = ifp->tstamp + ifp->prefered_lft * HZ;
3233 if (!ifp->regen_count && ifpub) {
3234 ifp->regen_count++;
3235 in6_ifa_hold(ifp);
3236 in6_ifa_hold(ifpub);
3237 spin_unlock(&ifp->lock);
5c578aed 3238
291d809b
HY		 3239 spin_lock(&ifpub->lock);
3240 ifpub->regen_count = 0;
3241 spin_unlock(&ifpub->lock);
1da177e4
LT		 3242 ipv6_create_tempaddr(ifpub, ifp);
3243 in6_ifa_put(ifpub);
3244 in6_ifa_put(ifp);
3245 goto restart;
3246 }
3247 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3248 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3249 spin_unlock(&ifp->lock);
3250#endif
3251 } else {
3252 /* ifp->prefered_lft <= ifp->valid_lft */
3253 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3254 next = ifp->tstamp + ifp->prefered_lft * HZ;
3255 spin_unlock(&ifp->lock);
3256 }
3257 }
1da177e4
LT		 3258 }
3259
b2db7564
YH		 3260 next_sec = round_jiffies_up(next);
3261 next_sched = next;
3262
3263 /* If rounded timeout is accurate enough, accept it. */
3264 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3265 next_sched = next_sec;
3266
3267 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3268 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3269 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3270
3271 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3272 now, next, next_sec, next_sched));
3273
3274 addr_chk_timer.expires = next_sched;
1da177e4 3275 add_timer(&addr_chk_timer);
5c578aed 3276 spin_unlock(&addrconf_verify_lock);
3277 rcu_read_unlock_bh();
1da177e4
LT		 3278}
3279
461d8837
TG		 3280static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3281{
3282 struct in6_addr *pfx = NULL;
3283
3284 if (addr)
3285 pfx = nla_data(addr);
3286
3287 if (local) {
3288 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3289 pfx = NULL;
3290 else
3291 pfx = nla_data(local);
3292 }
3293
3294 return pfx;
3295}
3296
ef7c79ed 3297static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3298 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3299 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3300 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3301};
3302
1da177e4
LT		 3303static int
3304inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3305{
3b1e0a65 3306 struct net *net = sock_net(skb->sk);
b933f716
TG		 3307 struct ifaddrmsg *ifm;
3308 struct nlattr *tb[IFA_MAX+1];
1da177e4 3309 struct in6_addr *pfx;
b933f716 3310 int err;
1da177e4 3311
b933f716
TG		 3312 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3313 if (err < 0)
3314 return err;
3315
3316 ifm = nlmsg_data(nlh);
3317 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3318 if (pfx == NULL)
3319 return -EINVAL;
3320
af284937 3321 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3322}
3323
55ebaef1
NT		 3324static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3325 u32 prefered_lft, u32 valid_lft)
081bba5b 3326{
6f704992
YH		 3327 u32 flags;
3328 clock_t expires;
4bed72e4 3329 unsigned long timeout;
46d48046 3330
081bba5b
NT		 3331 if (!valid_lft || (prefered_lft > valid_lft))
3332 return -EINVAL;
3333
4bed72e4
YH		 3334 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3335 if (addrconf_finite_timeout(timeout)) {
3336 expires = jiffies_to_clock_t(timeout * HZ);
3337 valid_lft = timeout;
6f704992 3338 flags = RTF_EXPIRES;
4bed72e4
YH		 3339 } else {
3340 expires = 0;
3341 flags = 0;
3342 ifa_flags |= IFA_F_PERMANENT;
6f704992 3343 }
081bba5b 3344
4bed72e4
YH		 3345 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3346 if (addrconf_finite_timeout(timeout)) {
3347 if (timeout == 0)
3348 ifa_flags |= IFA_F_DEPRECATED;
3349 prefered_lft = timeout;
3350 }
081bba5b
NT		 3351
3352 spin_lock_bh(&ifp->lock);
3b9f9a1c 3353 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3354 ifp->tstamp = jiffies;
3355 ifp->valid_lft = valid_lft;
3356 ifp->prefered_lft = prefered_lft;
3357
3358 spin_unlock_bh(&ifp->lock);
3359 if (!(ifp->flags&IFA_F_TENTATIVE))
3360 ipv6_ifa_notify(0, ifp);
081bba5b 3361
46d48046 3362 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3363 expires, flags);
081bba5b
NT		 3364 addrconf_verify(0);
3365
3366 return 0;
3367}
3368
1da177e4
LT		 3369static int
3370inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3371{
3b1e0a65 3372 struct net *net = sock_net(skb->sk);
461d8837
TG		 3373 struct ifaddrmsg *ifm;
3374 struct nlattr *tb[IFA_MAX+1];
1da177e4 3375 struct in6_addr *pfx;
7198f8ce
TG		 3376 struct inet6_ifaddr *ifa;
3377 struct net_device *dev;
55ebaef1
NT		 3378 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3379 u8 ifa_flags;
461d8837 3380 int err;
1da177e4 3381
461d8837
TG		 3382 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3383 if (err < 0)
3384 return err;
3385
3386 ifm = nlmsg_data(nlh);
3387 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3388 if (pfx == NULL)
3389 return -EINVAL;
3390
461d8837 3391 if (tb[IFA_CACHEINFO]) {
0778769d 3392 struct ifa_cacheinfo *ci;
461d8837
TG		 3393
3394 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3395 valid_lft = ci->ifa_valid;
461d8837
TG		 3396 preferred_lft = ci->ifa_prefered;
3397 } else {
3398 preferred_lft = INFINITY_LIFE_TIME;
3399 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3400 }
3401
af284937 3402 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3403 if (dev == NULL)
3404 return -ENODEV;
3405
55ebaef1 3406 /* We ignore other flags so far. */
3b9f9a1c 3407 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3408
1cab3da6 3409 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3410 if (ifa == NULL) {
3411 /*
3412 * It would be best to check for !NLM_F_CREATE here but
3413 * userspace alreay relies on not having to provide this.
3414 */
af284937
DL		 3415 return inet6_addr_add(net, ifm->ifa_index, pfx,
3416 ifm->ifa_prefixlen, ifa_flags,
3417 preferred_lft, valid_lft);
081bba5b
NT		 3418 }
3419
7198f8ce
TG		 3420 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3421 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3422 err = -EEXIST;
3423 else
55ebaef1 3424 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3425
3426 in6_ifa_put(ifa);
3427
3428 return err;
1da177e4
LT		 3429}
3430
101bb229
TG		 3431static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3432 u8 scope, int ifindex)
3433{
3434 struct ifaddrmsg *ifm;
3435
3436 ifm = nlmsg_data(nlh);
3437 ifm->ifa_family = AF_INET6;
3438 ifm->ifa_prefixlen = prefixlen;
3439 ifm->ifa_flags = flags;
3440 ifm->ifa_scope = scope;
3441 ifm->ifa_index = ifindex;
3442}
3443
85486af0
TG		 3444static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3445 unsigned long tstamp, u32 preferred, u32 valid)
3446{
3447 struct ifa_cacheinfo ci;
3448
18a31e1e
TG		 3449 ci.cstamp = cstamp_delta(cstamp);
3450 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3451 ci.ifa_prefered = preferred;
3452 ci.ifa_valid = valid;
3453
3454 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3455}
3456
101bb229
TG		 3457static inline int rt_scope(int ifa_scope)
3458{
3459 if (ifa_scope & IFA_HOST)
3460 return RT_SCOPE_HOST;
3461 else if (ifa_scope & IFA_LINK)
3462 return RT_SCOPE_LINK;
3463 else if (ifa_scope & IFA_SITE)
3464 return RT_SCOPE_SITE;
3465 else
3466 return RT_SCOPE_UNIVERSE;
3467}
3468
0ab6803b
TG		 3469static inline int inet6_ifaddr_msgsize(void)
3470{
339bf98f
TG		 3471 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3472 + nla_total_size(16) /* IFA_ADDRESS */
3473 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3474}
c5396a31 3475
1da177e4 3476static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3477 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3478{
1da177e4 3479 struct nlmsghdr *nlh;
85486af0 3480 u32 preferred, valid;
1da177e4 3481
0ab6803b
TG		 3482 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3483 if (nlh == NULL)
26932566 3484 return -EMSGSIZE;
0ab6803b 3485
101bb229
TG		 3486 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3487 ifa->idev->dev->ifindex);
3488
1da177e4 3489 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3490 preferred = ifa->prefered_lft;
3491 valid = ifa->valid_lft;
3492 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3493 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3494 if (preferred > tval)
3495 preferred -= tval;
3496 else
3497 preferred = 0;
f56619fc
BH		 3498 if (valid != INFINITY_LIFE_TIME) {
3499 if (valid > tval)
3500 valid -= tval;
3501 else
3502 valid = 0;
3503 }
1da177e4
LT		 3504 }
3505 } else {
85486af0
TG		 3506 preferred = INFINITY_LIFE_TIME;
3507 valid = INFINITY_LIFE_TIME;
3508 }
3509
0ab6803b 3510 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3511 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3512 nlmsg_cancel(skb, nlh);
3513 return -EMSGSIZE;
3514 }
1da177e4 3515
0ab6803b 3516 return nlmsg_end(skb, nlh);
1da177e4
LT		 3517}
3518
3519static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3520 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3521{
1da177e4 3522 struct nlmsghdr *nlh;
101bb229
TG		 3523 u8 scope = RT_SCOPE_UNIVERSE;
3524 int ifindex = ifmca->idev->dev->ifindex;
3525
3526 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3527 scope = RT_SCOPE_SITE;
1da177e4 3528
0ab6803b
TG		 3529 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3530 if (nlh == NULL)
26932566 3531 return -EMSGSIZE;
85486af0 3532
0ab6803b
TG		 3533 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3534 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3535 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3536 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3537 nlmsg_cancel(skb, nlh);
3538 return -EMSGSIZE;
3539 }
85486af0 3540
0ab6803b 3541 return nlmsg_end(skb, nlh);
1da177e4
LT		 3542}
3543
3544static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3545 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3546{
1da177e4 3547 struct nlmsghdr *nlh;
101bb229
TG		 3548 u8 scope = RT_SCOPE_UNIVERSE;
3549 int ifindex = ifaca->aca_idev->dev->ifindex;
3550
3551 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3552 scope = RT_SCOPE_SITE;
1da177e4 3553
0ab6803b
TG		 3554 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3555 if (nlh == NULL)
26932566 3556 return -EMSGSIZE;
85486af0 3557
0ab6803b
TG		 3558 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3559 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3560 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3561 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3562 nlmsg_cancel(skb, nlh);
3563 return -EMSGSIZE;
3564 }
1da177e4 3565
0ab6803b 3566 return nlmsg_end(skb, nlh);
1da177e4
LT		 3567}
3568
e21e8467 3569enum addr_type_t {
1da177e4
LT		 3570 UNICAST_ADDR,
3571 MULTICAST_ADDR,
3572 ANYCAST_ADDR,
3573};
3574
234b27c3
ED		 3575/* called with rcu_read_lock() */
3576static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3577 struct netlink_callback *cb, enum addr_type_t type,
3578 int s_ip_idx, int *p_ip_idx)
3579{
234b27c3
ED		 3580 struct ifmcaddr6 *ifmca;
3581 struct ifacaddr6 *ifaca;
3582 int err = 1;
3583 int ip_idx = *p_ip_idx;
3584
3585 read_lock_bh(&idev->lock);
3586 switch (type) {
502a2ffd 3587 case UNICAST_ADDR: {
3588 struct inet6_ifaddr *ifa;
3589
234b27c3 3590 /* unicast address incl. temp addr */
502a2ffd 3591 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3592 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3593 continue;
3594 err = inet6_fill_ifaddr(skb, ifa,
3595 NETLINK_CB(cb->skb).pid,
3596 cb->nlh->nlmsg_seq,
3597 RTM_NEWADDR,
3598 NLM_F_MULTI);
3599 if (err <= 0)
3600 break;
3601 }
3602 break;
502a2ffd 3603 }
234b27c3
ED		 3604 case MULTICAST_ADDR:
3605 /* multicast address */
3606 for (ifmca = idev->mc_list; ifmca;
3607 ifmca = ifmca->next, ip_idx++) {
3608 if (ip_idx < s_ip_idx)
3609 continue;
3610 err = inet6_fill_ifmcaddr(skb, ifmca,
3611 NETLINK_CB(cb->skb).pid,
3612 cb->nlh->nlmsg_seq,
3613 RTM_GETMULTICAST,
3614 NLM_F_MULTI);
3615 if (err <= 0)
3616 break;
3617 }
3618 break;
3619 case ANYCAST_ADDR:
3620 /* anycast address */
3621 for (ifaca = idev->ac_list; ifaca;
3622 ifaca = ifaca->aca_next, ip_idx++) {
3623 if (ip_idx < s_ip_idx)
3624 continue;
3625 err = inet6_fill_ifacaddr(skb, ifaca,
3626 NETLINK_CB(cb->skb).pid,
3627 cb->nlh->nlmsg_seq,
3628 RTM_GETANYCAST,
3629 NLM_F_MULTI);
3630 if (err <= 0)
3631 break;
3632 }
3633 break;
3634 default:
3635 break;
3636 }
3637 read_unlock_bh(&idev->lock);
3638 *p_ip_idx = ip_idx;
3639 return err;
3640}
3641
1da177e4
LT		 3642static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3643 enum addr_type_t type)
3644{
234b27c3
ED		 3645 struct net *net = sock_net(skb->sk);
3646 int h, s_h;
1da177e4
LT		 3647 int idx, ip_idx;
3648 int s_idx, s_ip_idx;
1da177e4 3649 struct net_device *dev;
234b27c3
ED		 3650 struct inet6_dev *idev;
3651 struct hlist_head *head;
3652 struct hlist_node *node;
1ab1457c 3653
234b27c3
ED		 3654 s_h = cb->args[0];
3655 s_idx = idx = cb->args[1];
3656 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3657
234b27c3
ED		 3658 rcu_read_lock();
3659 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3660 idx = 0;
3661 head = &net->dev_index_head[h];
3662 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3663 if (idx < s_idx)
3664 goto cont;
4b97efdf 3665 if (h > s_h || idx > s_idx)
234b27c3
ED		 3666 s_ip_idx = 0;
3667 ip_idx = 0;
e21e8467
SH		 3668 idev = __in6_dev_get(dev);
3669 if (!idev)
234b27c3
ED		 3670 goto cont;
3671
3672 if (in6_dump_addrs(idev, skb, cb, type,
3673 s_ip_idx, &ip_idx) <= 0)
3674 goto done;
7562f876 3675cont:
234b27c3
ED		 3676 idx++;
3677 }
1da177e4 3678 }
234b27c3
ED		 3679done:
3680 rcu_read_unlock();
3681 cb->args[0] = h;
3682 cb->args[1] = idx;
3683 cb->args[2] = ip_idx;
3684
1da177e4
LT		 3685 return skb->len;
3686}
3687
3688static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3689{
3690 enum addr_type_t type = UNICAST_ADDR;
b854272b 3691
1da177e4
LT		 3692 return inet6_dump_addr(skb, cb, type);
3693}
3694
3695static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3696{
3697 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3698
1da177e4
LT		 3699 return inet6_dump_addr(skb, cb, type);
3700}
3701
3702
3703static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3704{
3705 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3706
1da177e4
LT		 3707 return inet6_dump_addr(skb, cb, type);
3708}
3709
1b29fc2c
TG		 3710static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3711 void *arg)
6c223828 3712{
3b1e0a65 3713 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3714 struct ifaddrmsg *ifm;
3715 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3716 struct in6_addr *addr = NULL;
3717 struct net_device *dev = NULL;
3718 struct inet6_ifaddr *ifa;
3719 struct sk_buff *skb;
6c223828
NT		 3720 int err;
3721
1b29fc2c
TG		 3722 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3723 if (err < 0)
3724 goto errout;
3725
3726 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3727 if (addr == NULL) {
3728 err = -EINVAL;
3729 goto errout;
6c223828 3730 }
6c223828 3731
1b29fc2c 3732 ifm = nlmsg_data(nlh);
6c223828 3733 if (ifm->ifa_index)
6fda7350 3734 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3735
e21e8467
SH		 3736 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3737 if (!ifa) {
1b29fc2c
TG		 3738 err = -EADDRNOTAVAIL;
3739 goto errout;
3740 }
6c223828 3741
e21e8467
SH		 3742 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3743 if (!skb) {
6c223828 3744 err = -ENOBUFS;
1b29fc2c 3745 goto errout_ifa;
6c223828
NT		 3746 }
3747
6c223828
NT		 3748 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3749 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3750 if (err < 0) {
3751 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3752 WARN_ON(err == -EMSGSIZE);
3753 kfree_skb(skb);
3754 goto errout_ifa;
3755 }
6fda7350 3756 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3757errout_ifa:
6c223828 3758 in6_ifa_put(ifa);
1b29fc2c 3759errout:
6c223828 3760 return err;
6c223828
NT		 3761}
3762
1da177e4
LT		 3763static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3764{
3765 struct sk_buff *skb;
c346dca1 3766 struct net *net = dev_net(ifa->idev->dev);
5d620266 3767 int err = -ENOBUFS;
1da177e4 3768
0ab6803b 3769 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3770 if (skb == NULL)
3771 goto errout;
3772
3773 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3774 if (err < 0) {
3775 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3776 WARN_ON(err == -EMSGSIZE);
3777 kfree_skb(skb);
3778 goto errout;
3779 }
1ce85fe4
PNA		 3780 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3781 return;
5d620266
TG		 3782errout:
3783 if (err < 0)
6fda7350 3784 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3785}
3786
b6f99a21 3787static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3788 __s32 *array, int bytes)
3789{
04561c1f
TG		 3790 BUG_ON(bytes < (DEVCONF_MAX * 4));
3791
1da177e4
LT		 3792 memset(array, 0, bytes);
3793 array[DEVCONF_FORWARDING] = cnf->forwarding;
3794 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3795 array[DEVCONF_MTU6] = cnf->mtu6;
3796 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3797 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3798 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3799 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3800 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3801 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3802 jiffies_to_msecs(cnf->rtr_solicit_interval);
3803 array[DEVCONF_RTR_SOLICIT_DELAY] =
3804 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3805 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3806#ifdef CONFIG_IPV6_PRIVACY
3807 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3808 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3809 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3810 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3811 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3812#endif
3813 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3814 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3815 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3816#ifdef CONFIG_IPV6_ROUTER_PREF
3817 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3818 array[DEVCONF_RTR_PROBE_INTERVAL] =
3819 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3820#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3821 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3822#endif
930d6ff2 3823#endif
fbea49e1 3824 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3825 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3826#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3827 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3828#endif
7bc570c8
YH		 3829#ifdef CONFIG_IPV6_MROUTE
3830 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3831#endif
778d80be 3832 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3833 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3834 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3835}
3836
b382b191
TG		 3837static inline size_t inet6_ifla6_size(void)
3838{
3839 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3840 + nla_total_size(sizeof(struct ifla_cacheinfo))
3841 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3842 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3843 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3844}
3845
339bf98f
TG		 3846static inline size_t inet6_if_nlmsg_size(void)
3847{
3848 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3849 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3850 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3851 + nla_total_size(4) /* IFLA_MTU */
3852 + nla_total_size(4) /* IFLA_LINK */
b382b191 3853 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3854}
c5396a31 3855
7d720c3e
TH		 3856static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3857 int items, int bytes)
7f7d9a6b
HX		 3858{
3859 int i;
3860 int pad = bytes - sizeof(u64) * items;
3861 BUG_ON(pad < 0);
3862
3863 /* Use put_unaligned() because stats may not be aligned for u64. */
3864 put_unaligned(items, &stats[0]);
3865 for (i = 1; i < items; i++)
3866 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3867
3868 memset(&stats[items], 0, pad);
3869}
3870
4ce3c183
ED		 3871static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3872 int items, int bytes, size_t syncpoff)
3873{
3874 int i;
3875 int pad = bytes - sizeof(u64) * items;
3876 BUG_ON(pad < 0);
3877
3878 /* Use put_unaligned() because stats may not be aligned for u64. */
3879 put_unaligned(items, &stats[0]);
3880 for (i = 1; i < items; i++)
3881 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3882
3883 memset(&stats[items], 0, pad);
3884}
3885
7f7d9a6b
HX		 3886static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3887 int bytes)
3888{
e21e8467 3889 switch (attrtype) {
7f7d9a6b 3890 case IFLA_INET6_STATS:
4ce3c183
ED		 3891 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3892 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3893 break;
3894 case IFLA_INET6_ICMP6STATS:
7d720c3e 3895 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3896 break;
3897 }
3898}
3899
b382b191
TG		 3900static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3901{
3902 struct nlattr *nla;
3903 struct ifla_cacheinfo ci;
3904
3905 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3906
3907 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 3908 ci.tstamp = cstamp_delta(idev->tstamp);
3909 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3910 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
b382b191
TG		 3911 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3912
3913 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3914 if (nla == NULL)
3915 goto nla_put_failure;
3916 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3917
3918 /* XXX - MC not implemented */
3919
3920 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3921 if (nla == NULL)
3922 goto nla_put_failure;
3923 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3924
3925 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3926 if (nla == NULL)
3927 goto nla_put_failure;
3928 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3929
3930 return 0;
3931
3932nla_put_failure:
3933 return -EMSGSIZE;
3934}
3935
3936static size_t inet6_get_link_af_size(const struct net_device *dev)
3937{
3938 if (!__in6_dev_get(dev))
3939 return 0;
3940
3941 return inet6_ifla6_size();
3942}
3943
3944static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3945{
3946 struct inet6_dev *idev = __in6_dev_get(dev);
3947
3948 if (!idev)
3949 return -ENODATA;
3950
3951 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3952 return -EMSGSIZE;
3953
3954 return 0;
3955}
3956
1ab1457c 3957static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3958 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3959{
04561c1f 3960 struct net_device *dev = idev->dev;
04561c1f
TG		 3961 struct ifinfomsg *hdr;
3962 struct nlmsghdr *nlh;
3963 void *protoinfo;
04561c1f
TG		 3964
3965 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3966 if (nlh == NULL)
26932566 3967 return -EMSGSIZE;
04561c1f
TG		 3968
3969 hdr = nlmsg_data(nlh);
3970 hdr->ifi_family = AF_INET6;
3971 hdr->__ifi_pad = 0;
3972 hdr->ifi_type = dev->type;
3973 hdr->ifi_index = dev->ifindex;
3974 hdr->ifi_flags = dev_get_flags(dev);
3975 hdr->ifi_change = 0;
3976
3977 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3978
3979 if (dev->addr_len)
04561c1f 3980 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3981
04561c1f 3982 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3983 if (dev->ifindex != dev->iflink)
04561c1f 3984 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3985
04561c1f
TG		 3986 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3987 if (protoinfo == NULL)
3988 goto nla_put_failure;
1da177e4 3989
b382b191 3990 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 3991 goto nla_put_failure;
1da177e4 3992
04561c1f
TG		 3993 nla_nest_end(skb, protoinfo);
3994 return nlmsg_end(skb, nlh);
1da177e4 3995
04561c1f 3996nla_put_failure:
26932566
PM		 3997 nlmsg_cancel(skb, nlh);
3998 return -EMSGSIZE;
1da177e4
LT		 3999}
4000
4001static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4002{
3b1e0a65 4003 struct net *net = sock_net(skb->sk);
84d2697d 4004 int h, s_h;
434a8a58 4005 int idx = 0, s_idx;
1da177e4
LT		 4006 struct net_device *dev;
4007 struct inet6_dev *idev;
84d2697d
ED		 4008 struct hlist_head *head;
4009 struct hlist_node *node;
1da177e4 4010
84d2697d
ED		 4011 s_h = cb->args[0];
4012 s_idx = cb->args[1];
4013
4014 rcu_read_lock();
4015 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4016 idx = 0;
4017 head = &net->dev_index_head[h];
4018 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4019 if (idx < s_idx)
4020 goto cont;
4021 idev = __in6_dev_get(dev);
4022 if (!idev)
4023 goto cont;
4024 if (inet6_fill_ifinfo(skb, idev,
4025 NETLINK_CB(cb->skb).pid,
4026 cb->nlh->nlmsg_seq,
4027 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4028 goto out;
7562f876 4029cont:
84d2697d
ED		 4030 idx++;
4031 }
1da177e4 4032 }
84d2697d
ED		 4033out:
4034 rcu_read_unlock();
4035 cb->args[1] = idx;
4036 cb->args[0] = h;
1da177e4
LT		 4037
4038 return skb->len;
4039}
4040
4041void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4042{
4043 struct sk_buff *skb;
c346dca1 4044 struct net *net = dev_net(idev->dev);
8d7a76c9 4045 int err = -ENOBUFS;
1ab1457c 4046
339bf98f 4047 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4048 if (skb == NULL)
4049 goto errout;
4050
4051 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4052 if (err < 0) {
4053 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4054 WARN_ON(err == -EMSGSIZE);
4055 kfree_skb(skb);
4056 goto errout;
4057 }
5f75a104 4058 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4059 return;
8d7a76c9
TG		 4060errout:
4061 if (err < 0)
5f75a104 4062 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4063}
4064
339bf98f
TG		 4065static inline size_t inet6_prefix_nlmsg_size(void)
4066{
4067 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4068 + nla_total_size(sizeof(struct in6_addr))
4069 + nla_total_size(sizeof(struct prefix_cacheinfo));
4070}
c5396a31 4071
1da177e4 4072static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4073 struct prefix_info *pinfo, u32 pid, u32 seq,
4074 int event, unsigned int flags)
1da177e4 4075{
6051e2f4
TG		 4076 struct prefixmsg *pmsg;
4077 struct nlmsghdr *nlh;
1da177e4
LT		 4078 struct prefix_cacheinfo ci;
4079
6051e2f4
TG		 4080 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4081 if (nlh == NULL)
26932566 4082 return -EMSGSIZE;
6051e2f4
TG		 4083
4084 pmsg = nlmsg_data(nlh);
1da177e4 4085 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4086 pmsg->prefix_pad1 = 0;
4087 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4088 pmsg->prefix_ifindex = idev->dev->ifindex;
4089 pmsg->prefix_len = pinfo->prefix_len;
4090 pmsg->prefix_type = pinfo->type;
8a47077a 4091 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4092 pmsg->prefix_flags = 0;
4093 if (pinfo->onlink)
4094 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4095 if (pinfo->autoconf)
4096 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4097
6051e2f4 4098 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4099
4100 ci.preferred_time = ntohl(pinfo->prefered);
4101 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4102 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4103
6051e2f4 4104 return nlmsg_end(skb, nlh);
1da177e4 4105
6051e2f4 4106nla_put_failure:
26932566
PM		 4107 nlmsg_cancel(skb, nlh);
4108 return -EMSGSIZE;
1da177e4
LT		 4109}
4110
1ab1457c 4111static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4112 struct prefix_info *pinfo)
4113{
4114 struct sk_buff *skb;
c346dca1 4115 struct net *net = dev_net(idev->dev);
8c384bfa 4116 int err = -ENOBUFS;
1da177e4 4117
339bf98f 4118 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4119 if (skb == NULL)
4120 goto errout;
4121
4122 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4123 if (err < 0) {
4124 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4125 WARN_ON(err == -EMSGSIZE);
4126 kfree_skb(skb);
4127 goto errout;
4128 }
1ce85fe4
PNA		 4129 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4130 return;
8c384bfa
TG		 4131errout:
4132 if (err < 0)
6fda7350 4133 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4134}
4135
1da177e4
LT		 4136static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4137{
4138 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4139
4140 switch (event) {
4141 case RTM_NEWADDR:
95c385b4
NH		 4142 /*
4143 * If the address was optimistic
4144 * we inserted the route at the start of
4145 * our DAD process, so we don't need
4146 * to do it again
4147 */
4148 if (!(ifp->rt->rt6i_node))
4149 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4150 if (ifp->idev->cnf.forwarding)
4151 addrconf_join_anycast(ifp);
4152 break;
4153 case RTM_DELADDR:
4154 if (ifp->idev->cnf.forwarding)
4155 addrconf_leave_anycast(ifp);
4156 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4157 dst_hold(&ifp->rt->dst);
93fa159a 4158
e9d3e084
HX		 4159 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4160 ip6_del_rt(ifp->rt))
d8d1f30b 4161 dst_free(&ifp->rt->dst);
1da177e4
LT		 4162 break;
4163 }
4164}
4165
4166static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4167{
8814c4b5 4168 rcu_read_lock_bh();
1da177e4
LT		 4169 if (likely(ifp->idev->dead == 0))
4170 __ipv6_ifa_notify(event, ifp);
8814c4b5 4171 rcu_read_unlock_bh();
1da177e4
LT		 4172}
4173
4174#ifdef CONFIG_SYSCTL
4175
4176static
8d65af78 4177int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4178 void __user *buffer, size_t *lenp, loff_t *ppos)
4179{
4180 int *valp = ctl->data;
4181 int val = *valp;
88af182e 4182 loff_t pos = *ppos;
1da177e4
LT		 4183 int ret;
4184
8d65af78 4185 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4186
c8fecf22 4187 if (write)
b325fddb 4188 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4189 if (ret)
4190 *ppos = pos;
1ab1457c 4191 return ret;
1da177e4
LT		 4192}
4193
56d417b1
BH		 4194static void dev_disable_change(struct inet6_dev *idev)
4195{
4196 if (!idev || !idev->dev)
4197 return;
4198
4199 if (idev->cnf.disable_ipv6)
4200 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4201 else
4202 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4203}
4204
4205static void addrconf_disable_change(struct net *net, __s32 newf)
4206{
4207 struct net_device *dev;
4208 struct inet6_dev *idev;
4209
c6d14c84
ED		 4210 rcu_read_lock();
4211 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4212 idev = __in6_dev_get(dev);
4213 if (idev) {
4214 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4215 idev->cnf.disable_ipv6 = newf;
4216 if (changed)
4217 dev_disable_change(idev);
4218 }
56d417b1 4219 }
c6d14c84 4220 rcu_read_unlock();
56d417b1
BH		 4221}
4222
4223static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4224{
4225 struct net *net;
4226
4227 net = (struct net *)table->extra2;
4228
4229 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4230 return 0;
4231
88af182e
EB		 4232 if (!rtnl_trylock()) {
4233 /* Restore the original values before restarting */
4234 *p = old;
56d417b1 4235 return restart_syscall();
88af182e 4236 }
56d417b1
BH		 4237
4238 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4239 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4240 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4241 addrconf_disable_change(net, newf);
4242 } else if ((!*p) ^ (!old))
4243 dev_disable_change((struct inet6_dev *)table->extra1);
4244
4245 rtnl_unlock();
4246 return 0;
4247}
4248
4249static
8d65af78 4250int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4251 void __user *buffer, size_t *lenp, loff_t *ppos)
4252{
4253 int *valp = ctl->data;
4254 int val = *valp;
88af182e 4255 loff_t pos = *ppos;
56d417b1
BH		 4256 int ret;
4257
8d65af78 4258 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4259
4260 if (write)
4261 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4262 if (ret)
4263 *ppos = pos;
56d417b1
BH		 4264 return ret;
4265}
4266
1da177e4
LT		 4267static struct addrconf_sysctl_table
4268{
4269 struct ctl_table_header *sysctl_header;
f6a07b29 4270 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4271 char *dev_name;
ab32ea5d 4272} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4273 .sysctl_header = NULL,
4274 .addrconf_vars = {
1ab1457c 4275 {
e21e8467
SH		 4276 .procname = "forwarding",
4277 .data = &ipv6_devconf.forwarding,
4278 .maxlen = sizeof(int),
4279 .mode = 0644,
4280 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4281 },
4282 {
e21e8467
SH		 4283 .procname = "hop_limit",
4284 .data = &ipv6_devconf.hop_limit,
4285 .maxlen = sizeof(int),
4286 .mode = 0644,
4287 .proc_handler = proc_dointvec,
1da177e4
LT		 4288 },
4289 {
e21e8467
SH		 4290 .procname = "mtu",
4291 .data = &ipv6_devconf.mtu6,
4292 .maxlen = sizeof(int),
4293 .mode = 0644,
4294 .proc_handler = proc_dointvec,
1da177e4
LT		 4295 },
4296 {
e21e8467
SH		 4297 .procname = "accept_ra",
4298 .data = &ipv6_devconf.accept_ra,
4299 .maxlen = sizeof(int),
4300 .mode = 0644,
4301 .proc_handler = proc_dointvec,
1da177e4
LT		 4302 },
4303 {
e21e8467
SH		 4304 .procname = "accept_redirects",
4305 .data = &ipv6_devconf.accept_redirects,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
1da177e4
LT		 4309 },
4310 {
e21e8467
SH		 4311 .procname = "autoconf",
4312 .data = &ipv6_devconf.autoconf,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec,
1da177e4
LT		 4316 },
4317 {
e21e8467
SH		 4318 .procname = "dad_transmits",
4319 .data = &ipv6_devconf.dad_transmits,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
1da177e4
LT		 4323 },
4324 {
e21e8467
SH		 4325 .procname = "router_solicitations",
4326 .data = &ipv6_devconf.rtr_solicits,
4327 .maxlen = sizeof(int),
4328 .mode = 0644,
4329 .proc_handler = proc_dointvec,
1da177e4
LT		 4330 },
4331 {
e21e8467
SH		 4332 .procname = "router_solicitation_interval",
4333 .data = &ipv6_devconf.rtr_solicit_interval,
4334 .maxlen = sizeof(int),
4335 .mode = 0644,
4336 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4337 },
4338 {
e21e8467
SH		 4339 .procname = "router_solicitation_delay",
4340 .data = &ipv6_devconf.rtr_solicit_delay,
4341 .maxlen = sizeof(int),
4342 .mode = 0644,
4343 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4344 },
4345 {
e21e8467
SH		 4346 .procname = "force_mld_version",
4347 .data = &ipv6_devconf.force_mld_version,
4348 .maxlen = sizeof(int),
4349 .mode = 0644,
4350 .proc_handler = proc_dointvec,
1da177e4
LT		 4351 },
4352#ifdef CONFIG_IPV6_PRIVACY
4353 {
e21e8467
SH		 4354 .procname = "use_tempaddr",
4355 .data = &ipv6_devconf.use_tempaddr,
4356 .maxlen = sizeof(int),
4357 .mode = 0644,
4358 .proc_handler = proc_dointvec,
1da177e4
LT		 4359 },
4360 {
e21e8467
SH		 4361 .procname = "temp_valid_lft",
4362 .data = &ipv6_devconf.temp_valid_lft,
4363 .maxlen = sizeof(int),
4364 .mode = 0644,
4365 .proc_handler = proc_dointvec,
1da177e4
LT		 4366 },
4367 {
e21e8467
SH		 4368 .procname = "temp_prefered_lft",
4369 .data = &ipv6_devconf.temp_prefered_lft,
4370 .maxlen = sizeof(int),
4371 .mode = 0644,
4372 .proc_handler = proc_dointvec,
1da177e4
LT		 4373 },
4374 {
e21e8467
SH		 4375 .procname = "regen_max_retry",
4376 .data = &ipv6_devconf.regen_max_retry,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec,
1da177e4
LT		 4380 },
4381 {
e21e8467
SH		 4382 .procname = "max_desync_factor",
4383 .data = &ipv6_devconf.max_desync_factor,
4384 .maxlen = sizeof(int),
4385 .mode = 0644,
4386 .proc_handler = proc_dointvec,
1da177e4
LT		 4387 },
4388#endif
4389 {
e21e8467
SH		 4390 .procname = "max_addresses",
4391 .data = &ipv6_devconf.max_addresses,
4392 .maxlen = sizeof(int),
4393 .mode = 0644,
4394 .proc_handler = proc_dointvec,
1da177e4 4395 },
65f5c7c1 4396 {
e21e8467
SH		 4397 .procname = "accept_ra_defrtr",
4398 .data = &ipv6_devconf.accept_ra_defrtr,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
65f5c7c1 4402 },
c4fd30eb 4403 {
e21e8467
SH		 4404 .procname = "accept_ra_pinfo",
4405 .data = &ipv6_devconf.accept_ra_pinfo,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec,
c4fd30eb 4409 },
930d6ff2
YH		 4410#ifdef CONFIG_IPV6_ROUTER_PREF
4411 {
e21e8467
SH		 4412 .procname = "accept_ra_rtr_pref",
4413 .data = &ipv6_devconf.accept_ra_rtr_pref,
4414 .maxlen = sizeof(int),
4415 .mode = 0644,
4416 .proc_handler = proc_dointvec,
930d6ff2 4417 },
52e16356 4418 {
e21e8467
SH		 4419 .procname = "router_probe_interval",
4420 .data = &ipv6_devconf.rtr_probe_interval,
4421 .maxlen = sizeof(int),
4422 .mode = 0644,
4423 .proc_handler = proc_dointvec_jiffies,
52e16356 4424 },
fa03ef38 4425#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4426 {
e21e8467
SH		 4427 .procname = "accept_ra_rt_info_max_plen",
4428 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4429 .maxlen = sizeof(int),
4430 .mode = 0644,
4431 .proc_handler = proc_dointvec,
09c884d4
YH		 4432 },
4433#endif
930d6ff2 4434#endif
fbea49e1 4435 {
e21e8467
SH		 4436 .procname = "proxy_ndp",
4437 .data = &ipv6_devconf.proxy_ndp,
4438 .maxlen = sizeof(int),
4439 .mode = 0644,
4440 .proc_handler = proc_dointvec,
fbea49e1 4441 },
0bcbc926 4442 {
e21e8467
SH		 4443 .procname = "accept_source_route",
4444 .data = &ipv6_devconf.accept_source_route,
4445 .maxlen = sizeof(int),
4446 .mode = 0644,
4447 .proc_handler = proc_dointvec,
0bcbc926 4448 },
95c385b4
NH		 4449#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4450 {
e21e8467
SH		 4451 .procname = "optimistic_dad",
4452 .data = &ipv6_devconf.optimistic_dad,
4453 .maxlen = sizeof(int),
4454 .mode = 0644,
4455 .proc_handler = proc_dointvec,
95c385b4
NH		 4456
4457 },
7bc570c8
YH		 4458#endif
4459#ifdef CONFIG_IPV6_MROUTE
4460 {
e21e8467
SH		 4461 .procname = "mc_forwarding",
4462 .data = &ipv6_devconf.mc_forwarding,
4463 .maxlen = sizeof(int),
4464 .mode = 0444,
4465 .proc_handler = proc_dointvec,
7bc570c8 4466 },
95c385b4 4467#endif
778d80be 4468 {
e21e8467
SH		 4469 .procname = "disable_ipv6",
4470 .data = &ipv6_devconf.disable_ipv6,
4471 .maxlen = sizeof(int),
4472 .mode = 0644,
4473 .proc_handler = addrconf_sysctl_disable,
778d80be 4474 },
1b34be74 4475 {
e21e8467
SH		 4476 .procname = "accept_dad",
4477 .data = &ipv6_devconf.accept_dad,
4478 .maxlen = sizeof(int),
4479 .mode = 0644,
4480 .proc_handler = proc_dointvec,
1b34be74 4481 },
f7734fdf 4482 {
f7734fdf
OP		 4483 .procname = "force_tllao",
4484 .data = &ipv6_devconf.force_tllao,
4485 .maxlen = sizeof(int),
4486 .mode = 0644,
4487 .proc_handler = proc_dointvec
4488 },
1da177e4 4489 {
f8572d8f 4490 /* sentinel */
1da177e4
LT		 4491 }
4492 },
1da177e4
LT		 4493};
4494
bff16c2f 4495static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4496 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4497{
4498 int i;
1da177e4 4499 struct addrconf_sysctl_table *t;
1da177e4 4500
1dab6222
PE		 4501#define ADDRCONF_CTL_PATH_DEV 3
4502
4503 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4504 { .procname = "net", },
4505 { .procname = "ipv6", },
4506 { .procname = "conf", },
1dab6222
PE		 4507 { /* to be set */ },
4508 { },
4509 };
4510
4511
af879cc7 4512 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4513 if (t == NULL)
f68635e6
PE		 4514 goto out;
4515
bcdd553f 4516 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4517 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4518 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4519 t->addrconf_vars[i].extra2 = net;
1da177e4 4520 }
1da177e4 4521
1ab1457c
YH		 4522 /*
4523 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4524 * by sysctl and we wouldn't want anyone to change it under our feet
4525 * (see SIOCSIFNAME).
1ab1457c 4526 */
1dab6222
PE		 4527 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4528 if (!t->dev_name)
f68635e6 4529 goto free;
1da177e4 4530
1dab6222 4531 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4532
bff16c2f 4533 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4534 t->addrconf_vars);
1da177e4
LT		 4535 if (t->sysctl_header == NULL)
4536 goto free_procname;
f68635e6
PE		 4537
4538 p->sysctl = t;
95897312 4539 return 0;
1da177e4 4540
f68635e6 4541free_procname:
1dab6222 4542 kfree(t->dev_name);
f68635e6 4543free:
1da177e4 4544 kfree(t);
f68635e6 4545out:
95897312 4546 return -ENOBUFS;
1da177e4
LT		 4547}
4548
408c4768
PE		 4549static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4550{
4551 struct addrconf_sysctl_table *t;
4552
4553 if (p->sysctl == NULL)
4554 return;
4555
4556 t = p->sysctl;
4557 p->sysctl = NULL;
4558 unregister_sysctl_table(t->sysctl_header);
4559 kfree(t->dev_name);
4560 kfree(t);
4561}
4562
f52295a9
PE		 4563static void addrconf_sysctl_register(struct inet6_dev *idev)
4564{
54716e3b 4565 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4566 &ndisc_ifinfo_sysctl_change);
c346dca1 4567 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4568 idev, &idev->cnf);
f52295a9
PE		 4569}
4570
408c4768 4571static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4572{
408c4768
PE		 4573 __addrconf_sysctl_unregister(&idev->cnf);
4574 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4575}
4576
4577
4578#endif
4579
2c8c1e72 4580static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4581{
4582 int err;
4583 struct ipv6_devconf *all, *dflt;
4584
4585 err = -ENOMEM;
4586 all = &ipv6_devconf;
4587 dflt = &ipv6_devconf_dflt;
4588
09ad9bc7 4589 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4590 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4591 if (all == NULL)
4592 goto err_alloc_all;
4593
4594 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4595 if (dflt == NULL)
4596 goto err_alloc_dflt;
56d417b1
BH		 4597 } else {
4598 /* these will be inherited by all namespaces */
4599 dflt->autoconf = ipv6_defaults.autoconf;
4600 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4601 }
4602
4603 net->ipv6.devconf_all = all;
4604 net->ipv6.devconf_dflt = dflt;
4605
4606#ifdef CONFIG_SYSCTL
f8572d8f 4607 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4608 if (err < 0)
4609 goto err_reg_all;
4610
f8572d8f 4611 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4612 if (err < 0)
4613 goto err_reg_dflt;
4614#endif
4615 return 0;
4616
4617#ifdef CONFIG_SYSCTL
4618err_reg_dflt:
4619 __addrconf_sysctl_unregister(all);
4620err_reg_all:
4621 kfree(dflt);
4622#endif
4623err_alloc_dflt:
4624 kfree(all);
4625err_alloc_all:
4626 return err;
4627}
4628
2c8c1e72 4629static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4630{
4631#ifdef CONFIG_SYSCTL
4632 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4633 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4634#endif
09ad9bc7 4635 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4636 kfree(net->ipv6.devconf_dflt);
4637 kfree(net->ipv6.devconf_all);
4638 }
4639}
4640
4641static struct pernet_operations addrconf_ops = {
4642 .init = addrconf_init_net,
4643 .exit = addrconf_exit_net,
4644};
4645
1da177e4
LT		 4646/*
4647 * Device notifier
4648 */
4649
4650int register_inet6addr_notifier(struct notifier_block *nb)
4651{
1ab1457c 4652 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4653}
7159039a
YH		 4654EXPORT_SYMBOL(register_inet6addr_notifier);
4655
1da177e4
LT		 4656int unregister_inet6addr_notifier(struct notifier_block *nb)
4657{
e21e8467 4658 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4659}
7159039a
YH		 4660EXPORT_SYMBOL(unregister_inet6addr_notifier);
4661
b382b191
TG		 4662static struct rtnl_af_ops inet6_ops = {
4663 .family = AF_INET6,
4664 .fill_link_af = inet6_fill_link_af,
4665 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4666};
4667
1da177e4
LT		 4668/*
4669 * Init / cleanup code
4670 */
4671
4672int __init addrconf_init(void)
4673{
c2e21293 4674 int i, err;
2a8cc6c8 4675
e21e8467
SH		 4676 err = ipv6_addr_label_init();
4677 if (err < 0) {
4678 printk(KERN_CRIT "IPv6 Addrconf:"
4679 " cannot initialize default policy table: %d.\n", err);
2cc6d2bf 4680 goto out;
2a8cc6c8 4681 }
1da177e4 4682
2cc6d2bf
NH		 4683 err = register_pernet_subsys(&addrconf_ops);
4684 if (err < 0)
4685 goto out_addrlabel;
e0da5a48 4686
1da177e4
LT		 4687 /* The addrconf netdev notifier requires that loopback_dev
4688 * has it's ipv6 private information allocated and setup
4689 * before it can bring up and give link-local addresses
4690 * to other devices which are up.
4691 *
4692 * Unfortunately, loopback_dev is not necessarily the first
4693 * entry in the global dev_base list of net devices. In fact,
4694 * it is likely to be the very last entry on that list.
4695 * So this causes the notifier registry below to try and
4696 * give link-local addresses to all devices besides loopback_dev
4697 * first, then loopback_dev, which cases all the non-loopback_dev
4698 * devices to fail to get a link-local address.
4699 *
4700 * So, as a temporary fix, allocate the ipv6 structure for
4701 * loopback_dev first by hand.
4702 * Longer term, all of the dependencies ipv6 has upon the loopback
4703 * device and it being up should be removed.
4704 */
4705 rtnl_lock();
2774c7ab 4706 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4707 err = -ENOMEM;
4708 rtnl_unlock();
4709 if (err)
e0da5a48 4710 goto errlo;
1da177e4 4711
c2e21293 4712 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4713 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4714
1da177e4
LT		 4715 register_netdevice_notifier(&ipv6_dev_notf);
4716
1da177e4 4717 addrconf_verify(0);
c127ea2c 4718
b382b191
TG		 4719 err = rtnl_af_register(&inet6_ops);
4720 if (err < 0)
4721 goto errout_af;
4722
c127ea2c
TG		 4723 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4724 if (err < 0)
4725 goto errout;
4726
4727 /* Only the first call to __rtnl_register can fail */
4728 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4729 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4730 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4731 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4732 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4733
2a8cc6c8
YH		 4734 ipv6_addr_label_rtnl_register();
4735
1da177e4 4736 return 0;
c127ea2c 4737errout:
b382b191
TG		 4738 rtnl_af_unregister(&inet6_ops);
4739errout_af:
c127ea2c 4740 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4741errlo:
4742 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4743out_addrlabel:
4744 ipv6_addr_label_cleanup();
4745out:
c127ea2c 4746 return err;
1da177e4
LT		 4747}
4748
09f7709f 4749void addrconf_cleanup(void)
1da177e4 4750{
176c39af 4751 struct net_device *dev;
1da177e4
LT		 4752 int i;
4753
4754 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4755 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4756 ipv6_addr_label_cleanup();
1da177e4
LT		 4757
4758 rtnl_lock();
4759
b382b191
TG		 4760 __rtnl_af_unregister(&inet6_ops);
4761
176c39af
DL		 4762 /* clean dev list */
4763 for_each_netdev(&init_net, dev) {
4764 if (__in6_dev_get(dev) == NULL)
4765 continue;
4766 addrconf_ifdown(dev, 1);
4767 }
4768 addrconf_ifdown(init_net.loopback_dev, 2);
4769
1da177e4
LT		 4770 /*
4771 * Check hash table.
4772 */
5c578aed 4773 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4774 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4775 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4776 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4777
4778 del_timer(&addr_chk_timer);
1da177e4 4779 rtnl_unlock();
1da177e4 4780}
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