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bnx2x: update version to 1.78.00-0.
[deliverable/linux.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
f3213831
JP		 41#define pr_fmt(fmt) "IPv6: " fmt
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
a0bffffc 45#include <linux/kernel.h>
1da177e4
LT		 46#include <linux/socket.h>
47#include <linux/sockios.h>
1da177e4
LT		 48#include <linux/net.h>
49#include <linux/in6.h>
50#include <linux/netdevice.h>
1823730f 51#include <linux/if_addr.h>
1da177e4
LT		 52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
5a0e3ad6 58#include <linux/slab.h>
1da177e4
LT		 59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
4fc268d2 62#include <linux/capability.h>
1da177e4
LT		 63#include <linux/delay.h>
64#include <linux/notifier.h>
543537bd 65#include <linux/string.h>
ddbe5032 66#include <linux/hash.h>
1da177e4 67
457c4cbc 68#include <net/net_namespace.h>
1da177e4
LT		 69#include <net/sock.h>
70#include <net/snmp.h>
71
06a4c1c5 72#include <net/af_ieee802154.h>
1da177e4
LT		 73#include <net/ipv6.h>
74#include <net/protocol.h>
75#include <net/ndisc.h>
76#include <net/ip6_route.h>
77#include <net/addrconf.h>
78#include <net/tcp.h>
79#include <net/ip.h>
5d620266 80#include <net/netlink.h>
f24e3d65 81#include <net/pkt_sched.h>
1da177e4
LT		 82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
84
85#ifdef CONFIG_IPV6_PRIVACY
86#include <linux/random.h>
1da177e4
LT		 87#endif
88
e21e8467 89#include <linux/uaccess.h>
7f7d9a6b 90#include <asm/unaligned.h>
1da177e4
LT		 91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
bc3b2d7f 94#include <linux/export.h>
1da177e4
LT		 95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
100#define ADBG(x) printk x
101#else
102#define ADBG(x)
103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
18a31e1e
TG		 106
107static inline u32 cstamp_delta(unsigned long cstamp)
108{
109 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
110}
1da177e4 111
b2db7564
YH		 112#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
113#define ADDRCONF_TIMER_FUZZ (HZ / 4)
114#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
115
1da177e4 116#ifdef CONFIG_SYSCTL
f52295a9 117static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 118static void addrconf_sysctl_unregister(struct inet6_dev *idev);
119#else
120static inline void addrconf_sysctl_register(struct inet6_dev *idev)
121{
122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
1da177e4
LT		 127#endif
128
129#ifdef CONFIG_IPV6_PRIVACY
eb7e0575
SD		 130static void __ipv6_regen_rndid(struct inet6_dev *idev);
131static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4 132static void ipv6_regen_rndid(unsigned long data);
1da177e4
LT		 133#endif
134
1b34be74 135static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 136static int ipv6_count_addresses(struct inet6_dev *idev);
137
138/*
139 * Configured unicast address hash table
140 */
c2e21293 141static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 142static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 143
1da177e4
LT		 144static void addrconf_verify(unsigned long);
145
8d06afab 146static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 147static DEFINE_SPINLOCK(addrconf_verify_lock);
148
149static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
150static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
151
93d9b7d7
JP		 152static void addrconf_type_change(struct net_device *dev,
153 unsigned long event);
1da177e4
LT		 154static int addrconf_ifdown(struct net_device *dev, int how);
155
cf22f9a2 156static void addrconf_dad_start(struct inet6_ifaddr *ifp);
1da177e4
LT		 157static void addrconf_dad_timer(unsigned long data);
158static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 159static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 160static void addrconf_rs_timer(unsigned long data);
161static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163
1ab1457c 164static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 165 struct prefix_info *pinfo);
3e81c6da
DM		 166static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167 struct net_device *dev);
1da177e4 168
e041c683 169static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 170
888c848e 171static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 172 .forwarding = 0,
173 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
174 .mtu6 = IPV6_MIN_MTU,
175 .accept_ra = 1,
176 .accept_redirects = 1,
177 .autoconf = 1,
178 .force_mld_version = 0,
179 .dad_transmits = 1,
180 .rtr_solicits = MAX_RTR_SOLICITATIONS,
181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183#ifdef CONFIG_IPV6_PRIVACY
184 .use_tempaddr = 0,
185 .temp_valid_lft = TEMP_VALID_LIFETIME,
186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187 .regen_max_retry = REGEN_MAX_RETRY,
188 .max_desync_factor = MAX_DESYNC_FACTOR,
189#endif
190 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 191 .accept_ra_defrtr = 1,
c4fd30eb 192 .accept_ra_pinfo = 1,
930d6ff2
YH		 193#ifdef CONFIG_IPV6_ROUTER_PREF
194 .accept_ra_rtr_pref = 1,
52e16356 195 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 196#ifdef CONFIG_IPV6_ROUTE_INFO
197 .accept_ra_rt_info_max_plen = 0,
198#endif
930d6ff2 199#endif
fbea49e1 200 .proxy_ndp = 0,
0bcbc926 201 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 202 .disable_ipv6 = 0,
1b34be74 203 .accept_dad = 1,
1da177e4
LT		 204};
205
ab32ea5d 206static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 207 .forwarding = 0,
208 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209 .mtu6 = IPV6_MIN_MTU,
210 .accept_ra = 1,
211 .accept_redirects = 1,
212 .autoconf = 1,
213 .dad_transmits = 1,
214 .rtr_solicits = MAX_RTR_SOLICITATIONS,
215 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
216 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
217#ifdef CONFIG_IPV6_PRIVACY
218 .use_tempaddr = 0,
219 .temp_valid_lft = TEMP_VALID_LIFETIME,
220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221 .regen_max_retry = REGEN_MAX_RETRY,
222 .max_desync_factor = MAX_DESYNC_FACTOR,
223#endif
224 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 225 .accept_ra_defrtr = 1,
c4fd30eb 226 .accept_ra_pinfo = 1,
930d6ff2
YH		 227#ifdef CONFIG_IPV6_ROUTER_PREF
228 .accept_ra_rtr_pref = 1,
52e16356 229 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 230#ifdef CONFIG_IPV6_ROUTE_INFO
231 .accept_ra_rt_info_max_plen = 0,
232#endif
930d6ff2 233#endif
fbea49e1 234 .proxy_ndp = 0,
0bcbc926 235 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 236 .disable_ipv6 = 0,
1b34be74 237 .accept_dad = 1,
1da177e4
LT		 238};
239
240/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 241const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 242const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 243const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
244const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 245
f24e3d65 246/* Check if a valid qdisc is available */
05297949 247static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 248{
05297949 249 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 250}
251
2b5ead46
YH		 252/* Check if a route is valid prefix route */
253static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
254{
a02cec21 255 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
2b5ead46
YH		 256}
257
1da177e4
LT		 258static void addrconf_del_timer(struct inet6_ifaddr *ifp)
259{
260 if (del_timer(&ifp->timer))
261 __in6_ifa_put(ifp);
262}
263
e21e8467 264enum addrconf_timer_t {
1da177e4
LT		 265 AC_NONE,
266 AC_DAD,
267 AC_RS,
268};
269
270static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271 enum addrconf_timer_t what,
272 unsigned long when)
273{
274 if (!del_timer(&ifp->timer))
275 in6_ifa_hold(ifp);
276
277 switch (what) {
278 case AC_DAD:
279 ifp->timer.function = addrconf_dad_timer;
280 break;
281 case AC_RS:
282 ifp->timer.function = addrconf_rs_timer;
283 break;
e21e8467
SH		 284 default:
285 break;
1da177e4
LT		 286 }
287 ifp->timer.expires = jiffies + when;
288 add_timer(&ifp->timer);
289}
290
7f7d9a6b
HX		 291static int snmp6_alloc_dev(struct inet6_dev *idev)
292{
7d720c3e 293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
1823e4c8
ED		 294 sizeof(struct ipstats_mib),
295 __alignof__(struct ipstats_mib)) < 0)
7f7d9a6b 296 goto err_ip;
be281e55
ED		 297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6dev)
7f7d9a6b 300 goto err_icmp;
be281e55
ED		 301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
302 GFP_KERNEL);
303 if (!idev->stats.icmpv6msgdev)
14878f75 304 goto err_icmpmsg;
7f7d9a6b
HX		 305
306 return 0;
307
14878f75 308err_icmpmsg:
be281e55 309 kfree(idev->stats.icmpv6dev);
7f7d9a6b 310err_icmp:
7d720c3e 311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 312err_ip:
aaf70ec7 313 return -ENOMEM;
7f7d9a6b
HX		 314}
315
16910b98 316static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 317{
be281e55
ED		 318 kfree(idev->stats.icmpv6msgdev);
319 kfree(idev->stats.icmpv6dev);
7d720c3e 320 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 321}
322
1da177e4
LT		 323/* Nobody refers to this device, we may destroy it. */
324
325void in6_dev_finish_destroy(struct inet6_dev *idev)
326{
327 struct net_device *dev = idev->dev;
547b792c 328
502a2ffd 329 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 330 WARN_ON(idev->mc_list != NULL);
331
1da177e4 332#ifdef NET_REFCNT_DEBUG
91df42be 333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
1da177e4
LT		 334#endif
335 dev_put(dev);
336 if (!idev->dead) {
f3213831 337 pr_warn("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 338 return;
339 }
340 snmp6_free_dev(idev);
38f57d1a 341 kfree_rcu(idev, rcu);
1da177e4 342}
7159039a
YH		 343EXPORT_SYMBOL(in6_dev_finish_destroy);
344
8e5e8f30 345static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
1da177e4
LT		 346{
347 struct inet6_dev *ndev;
348
349 ASSERT_RTNL();
350
351 if (dev->mtu < IPV6_MIN_MTU)
352 return NULL;
353
1ab1457c 354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 355
1ab1457c
YH		 356 if (ndev == NULL)
357 return NULL;
322f74a4
IO		 358
359 rwlock_init(&ndev->lock);
360 ndev->dev = dev;
502a2ffd 361 INIT_LIST_HEAD(&ndev->addr_list);
362
c346dca1 363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
368 kfree(ndev);
369 return NULL;
370 }
0187bdfb
BH		 371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
322f74a4
IO		 373 /* We refer to the device */
374 dev_hold(dev);
1da177e4 375
322f74a4
IO		 376 if (snmp6_alloc_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
f3213831 378 "%s: cannot allocate memory for statistics; dev=%s.\n",
0dc47877 379 __func__, dev->name));
322f74a4 380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
8603e33d
RL		 381 dev_put(dev);
382 kfree(ndev);
322f74a4
IO		 383 return NULL;
384 }
1da177e4 385
322f74a4
IO		 386 if (snmp6_register_dev(ndev) < 0) {
387 ADBG((KERN_WARNING
f3213831 388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 389 __func__, dev->name));
322f74a4
IO		 390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 ndev->dead = 1;
392 in6_dev_finish_destroy(ndev);
393 return NULL;
394 }
395
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
398 */
399 in6_dev_hold(ndev);
1da177e4 400
1b34be74
YH		 401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
403
b077d7ab
YH		 404#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
f3213831 406 pr_info("%s: Disabled Multicast RS\n", dev->name);
b077d7ab
YH		 407 ndev->cnf.rtr_solicits = 0;
408 }
409#endif
410
1da177e4 411#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 412 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
9625ed72 416 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 417 dev->type == ARPHRD_SIT ||
0be669bb 418 dev->type == ARPHRD_NONE) {
322f74a4
IO		 419 ndev->cnf.use_tempaddr = -1;
420 } else {
421 in6_dev_hold(ndev);
422 ipv6_regen_rndid((unsigned long) ndev);
423 }
1da177e4
LT		 424#endif
425
f24e3d65 426 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 427 ndev->if_flags |= IF_READY;
428
322f74a4
IO		 429 ipv6_mc_init_dev(ndev);
430 ndev->tstamp = jiffies;
f52295a9 431 addrconf_sysctl_register(ndev);
30c4cf57 432 /* protected by rtnl_lock */
cf778b00 433 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 434
435 /* Join all-node multicast group */
f3ee4010 436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 437
d6ddef9e 438 /* Join all-router multicast group if forwarding is set */
8b2aaede 439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
d6ddef9e
LW		 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
441
1da177e4
LT		 442 return ndev;
443}
444
8e5e8f30 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
4acd4945 497 for_each_netdev(net, dev) {
1da177e4
LT		 498 idev = __in6_dev_get(dev);
499 if (idev) {
e186932b
PE		 500 int changed = (!idev->cnf.forwarding) ^ (!newf);
501 idev->cnf.forwarding = newf;
1da177e4
LT		 502 if (changed)
503 dev_forward_change(idev);
504 }
1da177e4 505 }
1da177e4 506}
c8fecf22 507
013d97e9 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
c8fecf22 509{
bff16c2f 510 struct net *net;
013d97e9
FR		 511 int old;
512
513 if (!rtnl_trylock())
514 return restart_syscall();
bff16c2f
PE		 515
516 net = (struct net *)table->extra2;
013d97e9
FR		 517 old = *p;
518 *p = newf;
b325fddb 519
013d97e9
FR		 520 if (p == &net->ipv6.devconf_dflt->forwarding) {
521 rtnl_unlock();
522 return 0;
88af182e 523 }
c8fecf22 524
e186932b 525 if (p == &net->ipv6.devconf_all->forwarding) {
e186932b
PE		 526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
013d97e9 528 } else if ((!newf) ^ (!old))
c8fecf22 529 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 530 rtnl_unlock();
c8fecf22 531
013d97e9 532 if (newf)
7b4da532 533 rt6_purge_dflt_routers(net);
b325fddb 534 return 1;
c8fecf22 535}
1da177e4
LT		 536#endif
537
5c578aed 538/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 539void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
540{
c2e21293 541 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 542
1da177e4 543#ifdef NET_REFCNT_DEBUG
91df42be 544 pr_debug("%s\n", __func__);
1da177e4
LT		 545#endif
546
547 in6_dev_put(ifp->idev);
548
549 if (del_timer(&ifp->timer))
e21e8467 550 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 551
e9d3e084 552 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
f3213831 553 pr_warn("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 554 return;
555 }
d8d1f30b 556 dst_release(&ifp->rt->dst);
1da177e4 557
e5785985 558 kfree_rcu(ifp, rcu);
1da177e4
LT		 559}
560
e55ffac6
BH		 561static void
562ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
563{
502a2ffd 564 struct list_head *p;
8a6ce0c0 565 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 566
567 /*
568 * Each device address list is sorted in order of scope -
569 * global before linklocal.
570 */
502a2ffd 571 list_for_each(p, &idev->addr_list) {
572 struct inet6_ifaddr *ifa
573 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 574 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 575 break;
576 }
577
b54c9b98 578 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 579}
580
ddbe5032 581static u32 inet6_addr_hash(const struct in6_addr *addr)
3eb84f49 582{
ddbe5032 583 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
3eb84f49
YH		 584}
585
1da177e4
LT		 586/* On success it returns ifp with increased reference count */
587
588static struct inet6_ifaddr *
589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 590 int scope, u32 flags)
1da177e4
LT		 591{
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
3a88a81d 594 unsigned int hash;
1da177e4 595 int err = 0;
d68b8270
YH		 596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 603
8814c4b5 604 rcu_read_lock_bh();
1da177e4
LT		 605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
56d417b1 610 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 611 err = -EACCES;
612 goto out2;
613 }
614
5c578aed 615 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 616
617 /* Ignore adding duplicate addresses on an interface */
c346dca1 618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
322f74a4 624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
8f031519 632 rt = addrconf_dst_alloc(idev, addr, false);
1da177e4
LT		 633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
4e3fd7a0 638 ifa->addr = *addr;
1da177e4
LT		 639
640 spin_lock_init(&ifa->lock);
e9d3e084 641 spin_lock_init(&ifa->state_lock);
1da177e4 642 init_timer(&ifa->timer);
c2e21293 643 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
57f5f544
KF		 650 ifa->rt = rt;
651
1da177e4
LT		 652 ifa->idev = idev;
653 in6_dev_hold(idev);
654 /* For caller */
655 in6_ifa_hold(ifa);
656
657 /* Add to big hash table */
ddbe5032 658 hash = inet6_addr_hash(addr);
1da177e4 659
5c578aed 660 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 661 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 662
663 write_lock(&idev->lock);
664 /* Add to inet6_dev unicast addr list. */
e55ffac6 665 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 666
667#ifdef CONFIG_IPV6_PRIVACY
668 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 669 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 670 in6_ifa_hold(ifa);
671 }
672#endif
673
1da177e4
LT		 674 in6_ifa_hold(ifa);
675 write_unlock(&idev->lock);
676out2:
8814c4b5 677 rcu_read_unlock_bh();
1da177e4 678
fd92833a 679 if (likely(err == 0))
e041c683 680 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 681 else {
682 kfree(ifa);
683 ifa = ERR_PTR(err);
684 }
685
686 return ifa;
687out:
5c578aed 688 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 689 goto out2;
690}
691
692/* This function wants to get referenced ifp and releases it before return */
693
694static void ipv6_del_addr(struct inet6_ifaddr *ifp)
695{
502a2ffd 696 struct inet6_ifaddr *ifa, *ifn;
1da177e4 697 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 698 int state;
1da177e4
LT		 699 int deleted = 0, onlink = 0;
700 unsigned long expires = jiffies;
701
4c5ff6a6
HX		 702 spin_lock_bh(&ifp->state_lock);
703 state = ifp->state;
e9d3e084 704 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 705 spin_unlock_bh(&ifp->state_lock);
706
707 if (state == INET6_IFADDR_STATE_DEAD)
708 goto out;
1da177e4 709
5c578aed 710 spin_lock_bh(&addrconf_hash_lock);
711 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 712 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 713
714 write_lock_bh(&idev->lock);
715#ifdef CONFIG_IPV6_PRIVACY
716 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 717 list_del(&ifp->tmp_list);
718 if (ifp->ifpub) {
719 in6_ifa_put(ifp->ifpub);
720 ifp->ifpub = NULL;
1da177e4 721 }
372e6c8f 722 __in6_ifa_put(ifp);
1da177e4
LT		 723 }
724#endif
725
502a2ffd 726 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 727 if (ifa == ifp) {
502a2ffd 728 list_del_init(&ifp->if_list);
1da177e4 729 __in6_ifa_put(ifp);
502a2ffd 730
1da177e4
LT		 731 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
732 break;
733 deleted = 1;
1d142804 734 continue;
1da177e4
LT		 735 } else if (ifp->flags & IFA_F_PERMANENT) {
736 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
737 ifp->prefix_len)) {
738 if (ifa->flags & IFA_F_PERMANENT) {
739 onlink = 1;
740 if (deleted)
741 break;
742 } else {
743 unsigned long lifetime;
744
745 if (!onlink)
746 onlink = -1;
747
748 spin_lock(&ifa->lock);
4bed72e4
YH		 749
750 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
751 /*
752 * Note: Because this address is
753 * not permanent, lifetime <
754 * LONG_MAX / HZ here.
755 */
1da177e4
LT		 756 if (time_before(expires,
757 ifa->tstamp + lifetime * HZ))
758 expires = ifa->tstamp + lifetime * HZ;
759 spin_unlock(&ifa->lock);
760 }
761 }
762 }
763 }
764 write_unlock_bh(&idev->lock);
765
b2238566
AV		 766 addrconf_del_timer(ifp);
767
1da177e4
LT		 768 ipv6_ifa_notify(RTM_DELADDR, ifp);
769
e041c683 770 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 771
1da177e4
LT		 772 /*
773 * Purge or update corresponding prefix
774 *
775 * 1) we don't purge prefix here if address was not permanent.
776 * prefix is managed by its own lifetime.
777 * 2) if there're no addresses, delete prefix.
778 * 3) if there're still other permanent address(es),
779 * corresponding prefix is still permanent.
780 * 4) otherwise, update prefix lifetime to the
781 * longest valid lifetime among the corresponding
782 * addresses on the device.
783 * Note: subsequent RA will update lifetime.
784 *
785 * --yoshfuji
786 */
787 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
788 struct in6_addr prefix;
789 struct rt6_info *rt;
c346dca1 790 struct net *net = dev_net(ifp->idev->dev);
1da177e4 791 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 792 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 793
2b5ead46 794 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 795 if (onlink == 0) {
e0a1ad73 796 ip6_del_rt(rt);
1da177e4
LT		 797 rt = NULL;
798 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1716a961 799 rt6_set_expires(rt, expires);
1da177e4
LT		 800 }
801 }
d8d1f30b 802 dst_release(&rt->dst);
1da177e4
LT		 803 }
804
c3968a85
DW		 805 /* clean up prefsrc entries */
806 rt6_remove_prefsrc(ifp);
4c5ff6a6 807out:
1da177e4
LT		 808 in6_ifa_put(ifp);
809}
810
811#ifdef CONFIG_IPV6_PRIVACY
812static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
813{
814 struct inet6_dev *idev = ifp->idev;
815 struct in6_addr addr, *tmpaddr;
76f793e3 816 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
eac55bf9 817 unsigned long regen_advance;
1da177e4
LT		 818 int tmp_plen;
819 int ret = 0;
820 int max_addresses;
95c385b4 821 u32 addr_flags;
76f793e3 822 unsigned long now = jiffies;
1da177e4
LT		 823
824 write_lock(&idev->lock);
825 if (ift) {
826 spin_lock_bh(&ift->lock);
827 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
828 spin_unlock_bh(&ift->lock);
829 tmpaddr = &addr;
830 } else {
831 tmpaddr = NULL;
832 }
833retry:
834 in6_dev_hold(idev);
835 if (idev->cnf.use_tempaddr <= 0) {
836 write_unlock(&idev->lock);
f3213831 837 pr_info("%s: use_tempaddr is disabled\n", __func__);
1da177e4
LT		 838 in6_dev_put(idev);
839 ret = -1;
840 goto out;
841 }
842 spin_lock_bh(&ifp->lock);
843 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
844 idev->cnf.use_tempaddr = -1; /*XXX*/
845 spin_unlock_bh(&ifp->lock);
846 write_unlock(&idev->lock);
f3213831
JP		 847 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
848 __func__);
1da177e4
LT		 849 in6_dev_put(idev);
850 ret = -1;
851 goto out;
852 }
853 in6_ifa_hold(ifp);
854 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
eb7e0575 855 __ipv6_try_regen_rndid(idev, tmpaddr);
1da177e4 856 memcpy(&addr.s6_addr[8], idev->rndid, 8);
76f793e3 857 age = (now - ifp->tstamp) / HZ;
1da177e4
LT		 858 tmp_valid_lft = min_t(__u32,
859 ifp->valid_lft,
7a876b0e 860 idev->cnf.temp_valid_lft + age);
1ab1457c
YH		 861 tmp_prefered_lft = min_t(__u32,
862 ifp->prefered_lft,
7a876b0e 863 idev->cnf.temp_prefered_lft + age -
784e2710 864 idev->cnf.max_desync_factor);
1da177e4
LT		 865 tmp_plen = ifp->prefix_len;
866 max_addresses = idev->cnf.max_addresses;
1da177e4
LT		 867 tmp_tstamp = ifp->tstamp;
868 spin_unlock_bh(&ifp->lock);
869
eac55bf9
BB		 870 regen_advance = idev->cnf.regen_max_retry *
871 idev->cnf.dad_transmits *
872 idev->nd_parms->retrans_time / HZ;
1da177e4 873 write_unlock(&idev->lock);
95c385b4 874
eac55bf9
BB		 875 /* A temporary address is created only if this calculated Preferred
876 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
877 * an implementation must not create a temporary address with a zero
878 * Preferred Lifetime.
879 */
880 if (tmp_prefered_lft <= regen_advance) {
881 in6_ifa_put(ifp);
882 in6_dev_put(idev);
883 ret = -1;
884 goto out;
885 }
886
95c385b4
NH		 887 addr_flags = IFA_F_TEMPORARY;
888 /* set in addrconf_prefix_rcv() */
889 if (ifp->flags & IFA_F_OPTIMISTIC)
890 addr_flags |= IFA_F_OPTIMISTIC;
891
1da177e4 892 ift = !max_addresses ||
1ab1457c 893 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 894 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 895 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
896 addr_flags) : NULL;
1da177e4
LT		 897 if (!ift || IS_ERR(ift)) {
898 in6_ifa_put(ifp);
899 in6_dev_put(idev);
f3213831 900 pr_info("%s: retry temporary address regeneration\n", __func__);
1da177e4
LT		 901 tmpaddr = &addr;
902 write_lock(&idev->lock);
903 goto retry;
904 }
905
906 spin_lock_bh(&ift->lock);
907 ift->ifpub = ifp;
908 ift->valid_lft = tmp_valid_lft;
909 ift->prefered_lft = tmp_prefered_lft;
76f793e3 910 ift->cstamp = now;
1da177e4
LT		 911 ift->tstamp = tmp_tstamp;
912 spin_unlock_bh(&ift->lock);
913
cf22f9a2 914 addrconf_dad_start(ift);
1da177e4
LT		 915 in6_ifa_put(ift);
916 in6_dev_put(idev);
917out:
918 return ret;
919}
920#endif
921
922/*
072047e4 923 * Choose an appropriate source address (RFC3484)
1da177e4 924 */
a9b05723
YH		 925enum {
926 IPV6_SADDR_RULE_INIT = 0,
927 IPV6_SADDR_RULE_LOCAL,
928 IPV6_SADDR_RULE_SCOPE,
929 IPV6_SADDR_RULE_PREFERRED,
930#ifdef CONFIG_IPV6_MIP6
931 IPV6_SADDR_RULE_HOA,
932#endif
933 IPV6_SADDR_RULE_OIF,
934 IPV6_SADDR_RULE_LABEL,
935#ifdef CONFIG_IPV6_PRIVACY
936 IPV6_SADDR_RULE_PRIVACY,
937#endif
938 IPV6_SADDR_RULE_ORCHID,
939 IPV6_SADDR_RULE_PREFIX,
940 IPV6_SADDR_RULE_MAX
941};
942
072047e4 943struct ipv6_saddr_score {
a9b05723
YH		 944 int rule;
945 int addr_type;
946 struct inet6_ifaddr *ifa;
947 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
948 int scopedist;
949 int matchlen;
072047e4
YH		 950};
951
a9b05723 952struct ipv6_saddr_dst {
9acd9f3a 953 const struct in6_addr *addr;
a9b05723
YH		 954 int ifindex;
955 int scope;
956 int label;
7cbca67c 957 unsigned int prefs;
a9b05723 958};
072047e4 959
b6f99a21 960static inline int ipv6_saddr_preferred(int type)
1da177e4 961{
45bb0060 962 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 963 return 1;
964 return 0;
1da177e4
LT		 965}
966
3de23255
BT		 967static int ipv6_get_saddr_eval(struct net *net,
968 struct ipv6_saddr_score *score,
a9b05723
YH		 969 struct ipv6_saddr_dst *dst,
970 int i)
971{
972 int ret;
973
974 if (i <= score->rule) {
975 switch (i) {
976 case IPV6_SADDR_RULE_SCOPE:
977 ret = score->scopedist;
978 break;
979 case IPV6_SADDR_RULE_PREFIX:
980 ret = score->matchlen;
981 break;
982 default:
983 ret = !!test_bit(i, score->scorebits);
984 }
985 goto out;
986 }
987
988 switch (i) {
989 case IPV6_SADDR_RULE_INIT:
990 /* Rule 0: remember if hiscore is not ready yet */
991 ret = !!score->ifa;
992 break;
993 case IPV6_SADDR_RULE_LOCAL:
994 /* Rule 1: Prefer same address */
995 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
996 break;
997 case IPV6_SADDR_RULE_SCOPE:
998 /* Rule 2: Prefer appropriate scope
999 *
1000 * ret
1001 * ^
1002 * -1 | d 15
1003 * ---+--+-+---> scope
1004 * |
1005 * | d is scope of the destination.
1006 * B-d | \
1007 * | \ <- smaller scope is better if
1008 * B-15 | \ if scope is enough for destinaion.
1009 * | ret = B - scope (-1 <= scope >= d <= 15).
1010 * d-C-1 | /
1011 * |/ <- greater is better
1012 * -C / if scope is not enough for destination.
1013 * /| ret = scope - C (-1 <= d < scope <= 15).
1014 *
1015 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1016 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1017 * Assume B = 0 and we get C > 29.
1018 */
1019 ret = __ipv6_addr_src_scope(score->addr_type);
1020 if (ret >= dst->scope)
1021 ret = -ret;
1022 else
1023 ret -= 128; /* 30 is enough */
1024 score->scopedist = ret;
1025 break;
1026 case IPV6_SADDR_RULE_PREFERRED:
1027 /* Rule 3: Avoid deprecated and optimistic addresses */
1028 ret = ipv6_saddr_preferred(score->addr_type) ||
1029 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1030 break;
1031#ifdef CONFIG_IPV6_MIP6
1032 case IPV6_SADDR_RULE_HOA:
7cbca67c 1033 {
a9b05723 1034 /* Rule 4: Prefer home address */
7cbca67c
YH		 1035 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1036 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1037 break;
7cbca67c 1038 }
a9b05723
YH		 1039#endif
1040 case IPV6_SADDR_RULE_OIF:
1041 /* Rule 5: Prefer outgoing interface */
1042 ret = (!dst->ifindex ||
1043 dst->ifindex == score->ifa->idev->dev->ifindex);
1044 break;
1045 case IPV6_SADDR_RULE_LABEL:
1046 /* Rule 6: Prefer matching label */
3de23255
BT		 1047 ret = ipv6_addr_label(net,
1048 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1049 score->ifa->idev->dev->ifindex) == dst->label;
1050 break;
1051#ifdef CONFIG_IPV6_PRIVACY
1052 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1053 {
a9b05723 1054 /* Rule 7: Prefer public address
25985edc 1055 * Note: prefer temporary address if use_tempaddr >= 2
a9b05723 1056 */
7cbca67c
YH		 1057 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1058 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1059 score->ifa->idev->cnf.use_tempaddr >= 2;
1060 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1061 break;
7cbca67c 1062 }
a9b05723
YH		 1063#endif
1064 case IPV6_SADDR_RULE_ORCHID:
1065 /* Rule 8-: Prefer ORCHID vs ORCHID or
1066 * non-ORCHID vs non-ORCHID
1067 */
1068 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1069 ipv6_addr_orchid(dst->addr));
1070 break;
1071 case IPV6_SADDR_RULE_PREFIX:
1072 /* Rule 8: Use longest matching prefix */
91b4b04f
YH		 1073 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1074 if (ret > score->ifa->prefix_len)
1075 ret = score->ifa->prefix_len;
1076 score->matchlen = ret;
a9b05723
YH		 1077 break;
1078 default:
1079 ret = 0;
1080 }
1081
1082 if (ret)
1083 __set_bit(i, score->scorebits);
1084 score->rule = i;
1085out:
1086 return ret;
1087}
1088
b3f644fc 1089int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
9acd9f3a 1090 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1091 struct in6_addr *saddr)
1da177e4 1092{
a9b05723
YH		 1093 struct ipv6_saddr_score scores[2],
1094 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1095 struct ipv6_saddr_dst dst;
072047e4 1096 struct net_device *dev;
a9b05723 1097 int dst_type;
1da177e4 1098
a9b05723
YH		 1099 dst_type = __ipv6_addr_type(daddr);
1100 dst.addr = daddr;
1101 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1102 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1103 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1104 dst.prefs = prefs;
a9b05723
YH		 1105
1106 hiscore->rule = -1;
1107 hiscore->ifa = NULL;
1da177e4 1108
8814c4b5 1109 rcu_read_lock();
1da177e4 1110
c6d14c84 1111 for_each_netdev_rcu(net, dev) {
072047e4 1112 struct inet6_dev *idev;
072047e4 1113
a9b05723 1114 /* Candidate Source Address (section 4)
072047e4
YH		 1115 * - multicast and link-local destination address,
1116 * the set of candidate source address MUST only
1117 * include addresses assigned to interfaces
1118 * belonging to the same link as the outgoing
1119 * interface.
1120 * (- For site-local destination addresses, the
1121 * set of candidate source addresses MUST only
1122 * include addresses assigned to interfaces
1123 * belonging to the same site as the outgoing
1124 * interface.)
1125 */
a9b05723
YH		 1126 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1127 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1128 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1129 continue;
1da177e4 1130
1da177e4 1131 idev = __in6_dev_get(dev);
072047e4
YH		 1132 if (!idev)
1133 continue;
1134
1135 read_lock_bh(&idev->lock);
502a2ffd 1136 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1137 int i;
072047e4 1138
a9b05723 1139 /*
6b3ae80a
YH		 1140 * - Tentative Address (RFC2462 section 5.4)
1141 * - A tentative address is not considered
1142 * "assigned to an interface" in the traditional
95c385b4 1143 * sense, unless it is also flagged as optimistic.
6b3ae80a 1144 * - Candidate Source Address (section 4)
072047e4
YH		 1145 * - In any case, anycast addresses, multicast
1146 * addresses, and the unspecified address MUST
1147 * NOT be included in a candidate set.
1148 */
a9b05723
YH		 1149 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1150 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1151 continue;
a9b05723
YH		 1152
1153 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1154
1155 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1156 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1157 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1158 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1159 "assigned as unicast address on %s",
1160 dev->name);
1161 continue;
1162 }
1163
a9b05723
YH		 1164 score->rule = -1;
1165 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1166
1167 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1168 int minihiscore, miniscore;
1169
3de23255
BT		 1170 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1171 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1172
1173 if (minihiscore > miniscore) {
1174 if (i == IPV6_SADDR_RULE_SCOPE &&
1175 score->scopedist > 0) {
1176 /*
1177 * special case:
1178 * each remaining entry
1179 * has too small (not enough)
1180 * scope, because ifa entries
1181 * are sorted by their scope
1182 * values.
1183 */
1184 goto try_nextdev;
1185 }
1186 break;
1187 } else if (minihiscore < miniscore) {
a9b05723
YH		 1188 if (hiscore->ifa)
1189 in6_ifa_put(hiscore->ifa);
1190
1191 in6_ifa_hold(score->ifa);
1192
a0bffffc 1193 swap(hiscore, score);
a9b05723
YH		 1194
1195 /* restore our iterator */
1196 score->ifa = hiscore->ifa;
1197
1198 break;
1da177e4 1199 }
072047e4 1200 }
1da177e4 1201 }
a9b05723 1202try_nextdev:
072047e4 1203 read_unlock_bh(&idev->lock);
1da177e4 1204 }
8814c4b5 1205 rcu_read_unlock();
1da177e4 1206
a9b05723 1207 if (!hiscore->ifa)
072047e4 1208 return -EADDRNOTAVAIL;
1ab1457c 1209
4e3fd7a0 1210 *saddr = hiscore->ifa->addr;
a9b05723 1211 in6_ifa_put(hiscore->ifa);
072047e4 1212 return 0;
1da177e4 1213}
5e5f3f0f 1214EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1215
95c385b4
NH		 1216int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1217 unsigned char banned_flags)
1da177e4
LT		 1218{
1219 struct inet6_dev *idev;
1220 int err = -EADDRNOTAVAIL;
1221
8814c4b5 1222 rcu_read_lock();
e21e8467
SH		 1223 idev = __in6_dev_get(dev);
1224 if (idev) {
1da177e4
LT		 1225 struct inet6_ifaddr *ifp;
1226
1227 read_lock_bh(&idev->lock);
502a2ffd 1228 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1229 if (ifp->scope == IFA_LINK &&
1230 !(ifp->flags & banned_flags)) {
4e3fd7a0 1231 *addr = ifp->addr;
1da177e4
LT		 1232 err = 0;
1233 break;
1234 }
1235 }
1236 read_unlock_bh(&idev->lock);
1237 }
8814c4b5 1238 rcu_read_unlock();
1da177e4
LT		 1239 return err;
1240}
1241
1242static int ipv6_count_addresses(struct inet6_dev *idev)
1243{
1244 int cnt = 0;
1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
502a2ffd 1248 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1249 cnt++;
1250 read_unlock_bh(&idev->lock);
1251 return cnt;
1252}
1253
b71d1d42 1254int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
bfeade08 1255 struct net_device *dev, int strict)
1da177e4 1256{
eedf042a 1257 struct inet6_ifaddr *ifp;
c2e21293 1258 struct hlist_node *node;
ddbe5032 1259 unsigned int hash = inet6_addr_hash(addr);
1da177e4 1260
5c578aed 1261 rcu_read_lock_bh();
1262 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1263 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1264 continue;
1da177e4 1265 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1266 !(ifp->flags&IFA_F_TENTATIVE) &&
1267 (dev == NULL || ifp->idev->dev == dev ||
1268 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1269 rcu_read_unlock_bh();
1270 return 1;
1da177e4
LT		 1271 }
1272 }
5c578aed 1273
eedf042a
SH		 1274 rcu_read_unlock_bh();
1275 return 0;
1da177e4 1276}
7159039a
YH		 1277EXPORT_SYMBOL(ipv6_chk_addr);
1278
3e81c6da
DM		 1279static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1280 struct net_device *dev)
1da177e4 1281{
ddbe5032 1282 unsigned int hash = inet6_addr_hash(addr);
c2e21293 1283 struct inet6_ifaddr *ifp;
1284 struct hlist_node *node;
1da177e4 1285
c2e21293 1286 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1287 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1288 continue;
1da177e4
LT		 1289 if (ipv6_addr_equal(&ifp->addr, addr)) {
1290 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1291 return true;
1da177e4
LT		 1292 }
1293 }
3e81c6da 1294 return false;
1da177e4
LT		 1295}
1296
b71d1d42 1297int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
52eeeb84
YH		 1298{
1299 struct inet6_dev *idev;
1300 struct inet6_ifaddr *ifa;
1301 int onlink;
1302
1303 onlink = 0;
1304 rcu_read_lock();
1305 idev = __in6_dev_get(dev);
1306 if (idev) {
1307 read_lock_bh(&idev->lock);
502a2ffd 1308 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1309 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1310 ifa->prefix_len);
1311 if (onlink)
1312 break;
1313 }
1314 read_unlock_bh(&idev->lock);
1315 }
1316 rcu_read_unlock();
1317 return onlink;
1318}
52eeeb84
YH		 1319EXPORT_SYMBOL(ipv6_chk_prefix);
1320
9acd9f3a 1321struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1322 struct net_device *dev, int strict)
1da177e4 1323{
b79d1d54 1324 struct inet6_ifaddr *ifp, *result = NULL;
ddbe5032 1325 unsigned int hash = inet6_addr_hash(addr);
b79d1d54 1326 struct hlist_node *node;
1da177e4 1327
5c578aed 1328 rcu_read_lock_bh();
4f70ecca 1329 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1330 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1331 continue;
1da177e4
LT		 1332 if (ipv6_addr_equal(&ifp->addr, addr)) {
1333 if (dev == NULL || ifp->idev->dev == dev ||
1334 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1335 result = ifp;
1da177e4
LT		 1336 in6_ifa_hold(ifp);
1337 break;
1338 }
1339 }
1340 }
5c578aed 1341 rcu_read_unlock_bh();
1da177e4 1342
b79d1d54 1343 return result;
1da177e4
LT		 1344}
1345
1da177e4
LT		 1346/* Gets referenced address, destroys ifaddr */
1347
cc411d0b 1348static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1349{
1da177e4
LT		 1350 if (ifp->flags&IFA_F_PERMANENT) {
1351 spin_lock_bh(&ifp->lock);
1352 addrconf_del_timer(ifp);
1353 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1354 if (dad_failed)
1355 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1356 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1357 if (dad_failed)
1358 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1359 in6_ifa_put(ifp);
1360#ifdef CONFIG_IPV6_PRIVACY
1361 } else if (ifp->flags&IFA_F_TEMPORARY) {
1362 struct inet6_ifaddr *ifpub;
1363 spin_lock_bh(&ifp->lock);
1364 ifpub = ifp->ifpub;
1365 if (ifpub) {
1366 in6_ifa_hold(ifpub);
1367 spin_unlock_bh(&ifp->lock);
1368 ipv6_create_tempaddr(ifpub, ifp);
1369 in6_ifa_put(ifpub);
1370 } else {
1371 spin_unlock_bh(&ifp->lock);
1372 }
1373 ipv6_del_addr(ifp);
1374#endif
1375 } else
1376 ipv6_del_addr(ifp);
1377}
1378
f2344a13
HX		 1379static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1380{
1381 int err = -ENOENT;
1382
1383 spin_lock(&ifp->state_lock);
1384 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1385 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1386 err = 0;
1387 }
1388 spin_unlock(&ifp->state_lock);
1389
1390 return err;
1391}
1392
3c21edbd
YH		 1393void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1394{
1b34be74 1395 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1396
853dc2e0
UB		 1397 if (addrconf_dad_end(ifp)) {
1398 in6_ifa_put(ifp);
f2344a13 1399 return;
853dc2e0 1400 }
f2344a13 1401
e87cc472
JP		 1402 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1403 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1404
1b34be74
YH		 1405 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1406 struct in6_addr addr;
1407
1408 addr.s6_addr32[0] = htonl(0xfe800000);
1409 addr.s6_addr32[1] = 0;
1410
1411 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1412 ipv6_addr_equal(&ifp->addr, &addr)) {
1413 /* DAD failed for link-local based on MAC address */
1414 idev->cnf.disable_ipv6 = 1;
9bdd8d40 1415
f3213831 1416 pr_info("%s: IPv6 being disabled!\n",
9bdd8d40 1417 ifp->idev->dev->name);
1b34be74
YH		 1418 }
1419 }
1420
cc411d0b 1421 addrconf_dad_stop(ifp, 1);
3c21edbd 1422}
1da177e4
LT		 1423
1424/* Join to solicited addr multicast group. */
1425
b71d1d42 1426void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 1427{
1428 struct in6_addr maddr;
1429
1430 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1431 return;
1432
1433 addrconf_addr_solict_mult(addr, &maddr);
1434 ipv6_dev_mc_inc(dev, &maddr);
1435}
1436
b71d1d42 1437void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 1438{
1439 struct in6_addr maddr;
1440
1441 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1442 return;
1443
1444 addrconf_addr_solict_mult(addr, &maddr);
1445 __ipv6_dev_mc_dec(idev, &maddr);
1446}
1447
20380731 1448static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1449{
1450 struct in6_addr addr;
2bda8a0c
BM		 1451 if (ifp->prefix_len == 127) /* RFC 6164 */
1452 return;
1da177e4
LT		 1453 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1454 if (ipv6_addr_any(&addr))
1455 return;
1456 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1457}
1458
20380731 1459static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1460{
1461 struct in6_addr addr;
32019e65
YH		 1462 if (ifp->prefix_len == 127) /* RFC 6164 */
1463 return;
1da177e4
LT		 1464 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1465 if (ipv6_addr_any(&addr))
1466 return;
1467 __ipv6_dev_ac_dec(ifp->idev, &addr);
1468}
1469
073a8e0e
YH		 1470static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1471{
1472 if (dev->addr_len != ETH_ALEN)
1473 return -1;
1474 memcpy(eui, dev->dev_addr, 3);
1475 memcpy(eui + 5, dev->dev_addr + 3, 3);
1476
1477 /*
1478 * The zSeries OSA network cards can be shared among various
1479 * OS instances, but the OSA cards have only one MAC address.
1480 * This leads to duplicate address conflicts in conjunction
1481 * with IPv6 if more than one instance uses the same card.
1482 *
1483 * The driver for these cards can deliver a unique 16-bit
1484 * identifier for each instance sharing the same card. It is
1485 * placed instead of 0xFFFE in the interface identifier. The
1486 * "u" bit of the interface identifier is not inverted in this
1487 * case. Hence the resulting interface identifier has local
1488 * scope according to RFC2373.
1489 */
1490 if (dev->dev_id) {
1491 eui[3] = (dev->dev_id >> 8) & 0xFF;
1492 eui[4] = dev->dev_id & 0xFF;
1493 } else {
1494 eui[3] = 0xFF;
1495 eui[4] = 0xFE;
1496 eui[0] ^= 2;
1497 }
1498 return 0;
1499}
1500
06a4c1c5 1501static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1502{
1503 if (dev->addr_len != IEEE802154_ADDR_LEN)
1504 return -1;
1505 memcpy(eui, dev->dev_addr, 8);
1506 return 0;
1507}
1508
073a8e0e
YH		 1509static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1510{
1511 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1512 if (dev->addr_len != ARCNET_ALEN)
1513 return -1;
1514 memset(eui, 0, 7);
8e5e8f30 1515 eui[7] = *(u8 *)dev->dev_addr;
073a8e0e
YH		 1516 return 0;
1517}
1518
1519static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1520{
1521 if (dev->addr_len != INFINIBAND_ALEN)
1522 return -1;
1523 memcpy(eui, dev->dev_addr + 12, 8);
1524 eui[0] |= 2;
1525 return 0;
1526}
1527
c61393ea 1528static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
dfd982ba 1529{
9af28511
SH		 1530 if (addr == 0)
1531 return -1;
dfd982ba
YH		 1532 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1533 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1534 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1535 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1536 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1537 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1538 eui[1] = 0;
1539 eui[2] = 0x5E;
1540 eui[3] = 0xFE;
1541 memcpy(eui + 4, &addr, 4);
1542 return 0;
1543}
dfd982ba
YH		 1544
1545static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1546{
1547 if (dev->priv_flags & IFF_ISATAP)
1548 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1549 return -1;
1550}
1551
aee80b54 1552static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1553{
1554 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1555}
1556
1da177e4
LT		 1557static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1558{
1559 switch (dev->type) {
1560 case ARPHRD_ETHER:
1561 case ARPHRD_FDDI:
073a8e0e 1562 return addrconf_ifid_eui48(eui, dev);
1da177e4 1563 case ARPHRD_ARCNET:
073a8e0e 1564 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1565 case ARPHRD_INFINIBAND:
073a8e0e 1566 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1567 case ARPHRD_SIT:
dfd982ba 1568 return addrconf_ifid_sit(eui, dev);
aee80b54 1569 case ARPHRD_IPGRE:
1570 return addrconf_ifid_gre(eui, dev);
06a4c1c5 1571 case ARPHRD_IEEE802154:
1572 return addrconf_ifid_eui64(eui, dev);
1da177e4
LT		 1573 }
1574 return -1;
1575}
1576
1577static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1578{
1579 int err = -1;
1580 struct inet6_ifaddr *ifp;
1581
1582 read_lock_bh(&idev->lock);
502a2ffd 1583 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1584 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1585 memcpy(eui, ifp->addr.s6_addr+8, 8);
1586 err = 0;
1587 break;
1588 }
1589 }
1590 read_unlock_bh(&idev->lock);
1591 return err;
1592}
1593
1594#ifdef CONFIG_IPV6_PRIVACY
1595/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
eb7e0575 1596static void __ipv6_regen_rndid(struct inet6_dev *idev)
1da177e4 1597{
1da177e4 1598regen:
955189ef 1599 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1600 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1601
1602 /*
1603 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1604 * check if generated address is not inappropriate
1605 *
1606 * - Reserved subnet anycast (RFC 2526)
1607 * 11111101 11....11 1xxxxxxx
c7dc89c0 1608 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1609 * 00-00-5E-FE-xx-xx-xx-xx
1610 * - value 0
1611 * - XXX: already assigned to an address on the device
1612 */
1ab1457c 1613 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1614 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1615 (idev->rndid[7]&0x80))
1616 goto regen;
1617 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1618 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1619 goto regen;
1620 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1621 goto regen;
1622 }
1da177e4
LT		 1623}
1624
1625static void ipv6_regen_rndid(unsigned long data)
1626{
1627 struct inet6_dev *idev = (struct inet6_dev *) data;
1628 unsigned long expires;
1629
8814c4b5 1630 rcu_read_lock_bh();
1da177e4
LT		 1631 write_lock_bh(&idev->lock);
1632
1633 if (idev->dead)
1634 goto out;
1635
eb7e0575 1636 __ipv6_regen_rndid(idev);
1ab1457c 1637
1da177e4 1638 expires = jiffies +
1ab1457c 1639 idev->cnf.temp_prefered_lft * HZ -
784e2710
BH		 1640 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1641 idev->cnf.max_desync_factor * HZ;
1da177e4 1642 if (time_before(expires, jiffies)) {
f3213831
JP		 1643 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1644 __func__, idev->dev->name);
1da177e4
LT		 1645 goto out;
1646 }
1647
1648 if (!mod_timer(&idev->regen_timer, expires))
1649 in6_dev_hold(idev);
1650
1651out:
1652 write_unlock_bh(&idev->lock);
8814c4b5 1653 rcu_read_unlock_bh();
1da177e4
LT		 1654 in6_dev_put(idev);
1655}
1656
eb7e0575 1657static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
8e5e8f30 1658{
1da177e4 1659 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
eb7e0575 1660 __ipv6_regen_rndid(idev);
1da177e4
LT		 1661}
1662#endif
1663
1664/*
1665 * Add prefix route.
1666 */
1667
1668static void
1669addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1670 unsigned long expires, u32 flags)
1da177e4 1671{
86872cb5
TG		 1672 struct fib6_config cfg = {
1673 .fc_table = RT6_TABLE_PREFIX,
1674 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1675 .fc_ifindex = dev->ifindex,
1676 .fc_expires = expires,
1677 .fc_dst_len = plen,
1678 .fc_flags = RTF_UP | flags,
c346dca1 1679 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1680 .fc_protocol = RTPROT_KERNEL,
86872cb5 1681 };
1da177e4 1682
4e3fd7a0 1683 cfg.fc_dst = *pfx;
1da177e4
LT		 1684
1685 /* Prevent useless cloning on PtP SIT.
1686 This thing is done here expecting that the whole
1687 class of non-broadcast devices need not cloning.
1688 */
0be669bb 1689#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1690 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1691 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1692#endif
1da177e4 1693
86872cb5 1694 ip6_route_add(&cfg);
1da177e4
LT		 1695}
1696
14ef37b6
AH		 1697
1698static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1699 int plen,
1700 const struct net_device *dev,
1701 u32 flags, u32 noflags)
1702{
1703 struct fib6_node *fn;
1704 struct rt6_info *rt = NULL;
1705 struct fib6_table *table;
1706
1707 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1708 if (table == NULL)
1709 return NULL;
1710
5744dd9b 1711 read_lock_bh(&table->tb6_lock);
14ef37b6
AH		 1712 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1713 if (!fn)
1714 goto out;
1715 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
d1918542 1716 if (rt->dst.dev->ifindex != dev->ifindex)
14ef37b6
AH		 1717 continue;
1718 if ((rt->rt6i_flags & flags) != flags)
1719 continue;
1720 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1721 continue;
1722 dst_hold(&rt->dst);
1723 break;
1724 }
1725out:
5744dd9b 1726 read_unlock_bh(&table->tb6_lock);
14ef37b6
AH		 1727 return rt;
1728}
1729
1730
1da177e4
LT		 1731/* Create "default" multicast route to the interface */
1732
1733static void addrconf_add_mroute(struct net_device *dev)
1734{
86872cb5
TG		 1735 struct fib6_config cfg = {
1736 .fc_table = RT6_TABLE_LOCAL,
1737 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1738 .fc_ifindex = dev->ifindex,
1739 .fc_dst_len = 8,
1740 .fc_flags = RTF_UP,
c346dca1 1741 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1742 };
1743
1744 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1745
1746 ip6_route_add(&cfg);
1da177e4
LT		 1747}
1748
0be669bb 1749#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1750static void sit_route_add(struct net_device *dev)
1751{
86872cb5
TG		 1752 struct fib6_config cfg = {
1753 .fc_table = RT6_TABLE_MAIN,
1754 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1755 .fc_ifindex = dev->ifindex,
1756 .fc_dst_len = 96,
1757 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1758 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1759 };
1da177e4
LT		 1760
1761 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1762 ip6_route_add(&cfg);
1da177e4 1763}
0be669bb 1764#endif
1da177e4
LT		 1765
1766static void addrconf_add_lroute(struct net_device *dev)
1767{
1768 struct in6_addr addr;
1769
1770 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1771 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1772}
1773
1774static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1775{
1776 struct inet6_dev *idev;
1777
1778 ASSERT_RTNL();
1779
e21e8467
SH		 1780 idev = ipv6_find_idev(dev);
1781 if (!idev)
64e724f6
BH		 1782 return ERR_PTR(-ENOBUFS);
1783
1784 if (idev->cnf.disable_ipv6)
1785 return ERR_PTR(-EACCES);
1da177e4
LT		 1786
1787 /* Add default multicast route */
4af04aba
LW		 1788 if (!(dev->flags & IFF_LOOPBACK))
1789 addrconf_add_mroute(dev);
1da177e4
LT		 1790
1791 /* Add link local route */
1792 addrconf_add_lroute(dev);
1793 return idev;
1794}
1795
e6bff995 1796void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1da177e4
LT		 1797{
1798 struct prefix_info *pinfo;
1799 __u32 valid_lft;
1800 __u32 prefered_lft;
1801 int addr_type;
1da177e4 1802 struct inet6_dev *in6_dev;
56d417b1 1803 struct net *net = dev_net(dev);
1da177e4
LT		 1804
1805 pinfo = (struct prefix_info *) opt;
1ab1457c 1806
1da177e4
LT		 1807 if (len < sizeof(struct prefix_info)) {
1808 ADBG(("addrconf: prefix option too short\n"));
1809 return;
1810 }
1ab1457c 1811
1da177e4
LT		 1812 /*
1813 * Validation checks ([ADDRCONF], page 19)
1814 */
1815
1816 addr_type = ipv6_addr_type(&pinfo->prefix);
1817
1818 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1819 return;
1820
1821 valid_lft = ntohl(pinfo->valid);
1822 prefered_lft = ntohl(pinfo->prefered);
1823
1824 if (prefered_lft > valid_lft) {
e87cc472 1825 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1da177e4
LT		 1826 return;
1827 }
1828
1829 in6_dev = in6_dev_get(dev);
1830
1831 if (in6_dev == NULL) {
e87cc472
JP		 1832 net_dbg_ratelimited("addrconf: device %s not configured\n",
1833 dev->name);
1da177e4
LT		 1834 return;
1835 }
1836
1837 /*
1838 * Two things going on here:
1839 * 1) Add routes for on-link prefixes
1840 * 2) Configure prefixes with the auto flag set
1841 */
1842
4bed72e4
YH		 1843 if (pinfo->onlink) {
1844 struct rt6_info *rt;
1845 unsigned long rt_expires;
1846
6f704992
YH		 1847 /* Avoid arithmetic overflow. Really, we could
1848 * save rt_expires in seconds, likely valid_lft,
1849 * but it would require division in fib gc, that it
1850 * not good.
1851 */
4bed72e4
YH		 1852 if (HZ > USER_HZ)
1853 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1854 else
1855 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1856
4bed72e4
YH		 1857 if (addrconf_finite_timeout(rt_expires))
1858 rt_expires *= HZ;
1da177e4 1859
14ef37b6
AH		 1860 rt = addrconf_get_prefix_route(&pinfo->prefix,
1861 pinfo->prefix_len,
1862 dev,
1863 RTF_ADDRCONF | RTF_PREFIX_RT,
1864 RTF_GATEWAY | RTF_DEFAULT);
1da177e4 1865
14ef37b6 1866 if (rt) {
6f704992
YH		 1867 /* Autoconf prefix route */
1868 if (valid_lft == 0) {
1869 ip6_del_rt(rt);
1870 rt = NULL;
4bed72e4 1871 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992 1872 /* not infinity */
1716a961 1873 rt6_set_expires(rt, jiffies + rt_expires);
6f704992 1874 } else {
1716a961 1875 rt6_clean_expires(rt);
1da177e4
LT		 1876 }
1877 } else if (valid_lft) {
6f704992 1878 clock_t expires = 0;
4bed72e4
YH		 1879 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1880 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1881 /* not infinity */
1882 flags |= RTF_EXPIRES;
1883 expires = jiffies_to_clock_t(rt_expires);
1884 }
1da177e4 1885 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1886 dev, expires, flags);
1da177e4
LT		 1887 }
1888 if (rt)
d8d1f30b 1889 dst_release(&rt->dst);
1da177e4
LT		 1890 }
1891
1892 /* Try to figure out our local address for this prefix */
1893
1894 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
8e5e8f30 1895 struct inet6_ifaddr *ifp;
1da177e4
LT		 1896 struct in6_addr addr;
1897 int create = 0, update_lft = 0;
1898
1899 if (pinfo->prefix_len == 64) {
1900 memcpy(&addr, &pinfo->prefix, 8);
1901 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1902 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1903 in6_dev_put(in6_dev);
1904 return;
1905 }
1906 goto ok;
1907 }
e87cc472
JP		 1908 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1909 pinfo->prefix_len);
1da177e4
LT		 1910 in6_dev_put(in6_dev);
1911 return;
1912
1913ok:
1914
53b7997f 1915 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1916
1917 if (ifp == NULL && valid_lft) {
1918 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1919 u32 addr_flags = 0;
1920
1921#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1922 if (in6_dev->cnf.optimistic_dad &&
e6bff995 1923 !net->ipv6.devconf_all->forwarding && sllao)
95c385b4
NH		 1924 addr_flags = IFA_F_OPTIMISTIC;
1925#endif
1da177e4
LT		 1926
1927 /* Do not allow to create too much of autoconfigured
1928 * addresses; this would be too easy way to crash kernel.
1929 */
1930 if (!max_addresses ||
1931 ipv6_count_addresses(in6_dev) < max_addresses)
1932 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1933 addr_type&IPV6_ADDR_SCOPE_MASK,
1934 addr_flags);
1da177e4
LT		 1935
1936 if (!ifp || IS_ERR(ifp)) {
1937 in6_dev_put(in6_dev);
1938 return;
1939 }
1940
1941 update_lft = create = 1;
1942 ifp->cstamp = jiffies;
cf22f9a2 1943 addrconf_dad_start(ifp);
1da177e4
LT		 1944 }
1945
1946 if (ifp) {
1947 int flags;
1948 unsigned long now;
1949#ifdef CONFIG_IPV6_PRIVACY
1950 struct inet6_ifaddr *ift;
1951#endif
1952 u32 stored_lft;
1953
1954 /* update lifetime (RFC2462 5.5.3 e) */
1955 spin_lock(&ifp->lock);
1956 now = jiffies;
1957 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1958 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1959 else
1960 stored_lft = 0;
1961 if (!update_lft && stored_lft) {
1962 if (valid_lft > MIN_VALID_LIFETIME ||
1963 valid_lft > stored_lft)
1964 update_lft = 1;
1965 else if (stored_lft <= MIN_VALID_LIFETIME) {
1966 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1967 /*
1968 * RFC 4862 Section 5.5.3e:
1969 * "Note that the preferred lifetime of
1970 * the corresponding address is always
1971 * reset to the Preferred Lifetime in
1972 * the received Prefix Information
1973 * option, regardless of whether the
1974 * valid lifetime is also reset or
1975 * ignored."
1976 *
1977 * So if the preferred lifetime in
1978 * this advertisement is different
1979 * than what we have stored, but the
1980 * valid lifetime is invalid, just
1981 * reset prefered_lft.
1982 *
1983 * We must set the valid lifetime
1984 * to the stored lifetime since we'll
1985 * be updating the timestamp below,
1986 * else we'll set it back to the
25985edc 1987 * minimum.
a1ed0526
BH		 1988 */
1989 if (prefered_lft != ifp->prefered_lft) {
1990 valid_lft = stored_lft;
1991 update_lft = 1;
1992 }
1da177e4
LT		 1993 } else {
1994 valid_lft = MIN_VALID_LIFETIME;
1995 if (valid_lft < prefered_lft)
1996 prefered_lft = valid_lft;
1997 update_lft = 1;
1998 }
1999 }
2000
2001 if (update_lft) {
2002 ifp->valid_lft = valid_lft;
2003 ifp->prefered_lft = prefered_lft;
2004 ifp->tstamp = now;
2005 flags = ifp->flags;
2006 ifp->flags &= ~IFA_F_DEPRECATED;
2007 spin_unlock(&ifp->lock);
2008
2009 if (!(flags&IFA_F_TENTATIVE))
2010 ipv6_ifa_notify(0, ifp);
2011 } else
2012 spin_unlock(&ifp->lock);
2013
2014#ifdef CONFIG_IPV6_PRIVACY
2015 read_lock_bh(&in6_dev->lock);
2016 /* update all temporary addresses in the list */
76f793e3
LC		 2017 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2018 tmp_list) {
2019 int age, max_valid, max_prefered;
2020
c6fbfac2
BB		 2021 if (ifp != ift->ifpub)
2022 continue;
2023
76f793e3
LC		 2024 /*
2025 * RFC 4941 section 3.3:
2026 * If a received option will extend the lifetime
2027 * of a public address, the lifetimes of
2028 * temporary addresses should be extended,
2029 * subject to the overall constraint that no
2030 * temporary addresses should ever remain
2031 * "valid" or "preferred" for a time longer than
2032 * (TEMP_VALID_LIFETIME) or
2033 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2034 * respectively.
2035 */
2036 age = (now - ift->cstamp) / HZ;
2037 max_valid = in6_dev->cnf.temp_valid_lft - age;
2038 if (max_valid < 0)
2039 max_valid = 0;
2040
2041 max_prefered = in6_dev->cnf.temp_prefered_lft -
2042 in6_dev->cnf.max_desync_factor -
2043 age;
2044 if (max_prefered < 0)
2045 max_prefered = 0;
2046
2047 if (valid_lft > max_valid)
2048 valid_lft = max_valid;
2049
2050 if (prefered_lft > max_prefered)
2051 prefered_lft = max_prefered;
2052
1da177e4
LT		 2053 spin_lock(&ift->lock);
2054 flags = ift->flags;
76f793e3
LC		 2055 ift->valid_lft = valid_lft;
2056 ift->prefered_lft = prefered_lft;
2057 ift->tstamp = now;
2058 if (prefered_lft > 0)
2059 ift->flags &= ~IFA_F_DEPRECATED;
2060
1da177e4
LT		 2061 spin_unlock(&ift->lock);
2062 if (!(flags&IFA_F_TENTATIVE))
2063 ipv6_ifa_notify(0, ift);
2064 }
2065
aed65501 2066 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
1da177e4 2067 /*
76f793e3
LC		 2068 * When a new public address is created as
2069 * described in [ADDRCONF], also create a new
2070 * temporary address. Also create a temporary
2071 * address if it's enabled but no temporary
2072 * address currently exists.
1da177e4 2073 */
1ab1457c 2074 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2075 ipv6_create_tempaddr(ifp, NULL);
2076 } else {
2077 read_unlock_bh(&in6_dev->lock);
2078 }
2079#endif
2080 in6_ifa_put(ifp);
2081 addrconf_verify(0);
2082 }
2083 }
2084 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2085 in6_dev_put(in6_dev);
2086}
2087
2088/*
2089 * Set destination address.
2090 * Special case for SIT interfaces where we create a new "virtual"
2091 * device.
2092 */
af284937 2093int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2094{
2095 struct in6_ifreq ireq;
2096 struct net_device *dev;
2097 int err = -EINVAL;
2098
2099 rtnl_lock();
2100
2101 err = -EFAULT;
2102 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2103 goto err_exit;
2104
af284937 2105 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2106
2107 err = -ENODEV;
2108 if (dev == NULL)
2109 goto err_exit;
2110
0be669bb 2111#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2112 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2113 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2114 struct ifreq ifr;
1da177e4
LT		 2115 struct ip_tunnel_parm p;
2116
2117 err = -EADDRNOTAVAIL;
2118 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2119 goto err_exit;
2120
2121 memset(&p, 0, sizeof(p));
2122 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2123 p.iph.saddr = 0;
2124 p.iph.version = 4;
2125 p.iph.ihl = 5;
2126 p.iph.protocol = IPPROTO_IPV6;
2127 p.iph.ttl = 64;
d20b3109 2128 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2129
5bc3eb7e
SH		 2130 if (ops->ndo_do_ioctl) {
2131 mm_segment_t oldfs = get_fs();
2132
2133 set_fs(KERNEL_DS);
2134 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2135 set_fs(oldfs);
2136 } else
2137 err = -EOPNOTSUPP;
1da177e4
LT		 2138
2139 if (err == 0) {
2140 err = -ENOBUFS;
af284937
DL		 2141 dev = __dev_get_by_name(net, p.name);
2142 if (!dev)
1da177e4
LT		 2143 goto err_exit;
2144 err = dev_open(dev);
2145 }
2146 }
0be669bb 2147#endif
1da177e4
LT		 2148
2149err_exit:
2150 rtnl_unlock();
2151 return err;
2152}
2153
2154/*
2155 * Manual configuration of address on an interface
2156 */
b71d1d42 2157static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2158 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2159 __u32 valid_lft)
1da177e4
LT		 2160{
2161 struct inet6_ifaddr *ifp;
2162 struct inet6_dev *idev;
2163 struct net_device *dev;
2164 int scope;
6f704992
YH		 2165 u32 flags;
2166 clock_t expires;
4bed72e4 2167 unsigned long timeout;
1da177e4
LT		 2168
2169 ASSERT_RTNL();
1ab1457c 2170
24ef0da7
TG		 2171 if (plen > 128)
2172 return -EINVAL;
2173
0778769d
NT		 2174 /* check the lifetime */
2175 if (!valid_lft || prefered_lft > valid_lft)
2176 return -EINVAL;
2177
af284937
DL		 2178 dev = __dev_get_by_index(net, ifindex);
2179 if (!dev)
1da177e4 2180 return -ENODEV;
1ab1457c 2181
64e724f6
BH		 2182 idev = addrconf_add_dev(dev);
2183 if (IS_ERR(idev))
2184 return PTR_ERR(idev);
1da177e4
LT		 2185
2186 scope = ipv6_addr_scope(pfx);
2187
4bed72e4
YH		 2188 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2189 if (addrconf_finite_timeout(timeout)) {
2190 expires = jiffies_to_clock_t(timeout * HZ);
2191 valid_lft = timeout;
6f704992 2192 flags = RTF_EXPIRES;
4bed72e4
YH		 2193 } else {
2194 expires = 0;
2195 flags = 0;
2196 ifa_flags |= IFA_F_PERMANENT;
6f704992 2197 }
0778769d 2198
4bed72e4
YH		 2199 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2200 if (addrconf_finite_timeout(timeout)) {
2201 if (timeout == 0)
2202 ifa_flags |= IFA_F_DEPRECATED;
2203 prefered_lft = timeout;
2204 }
0778769d
NT		 2205
2206 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2207
1da177e4 2208 if (!IS_ERR(ifp)) {
06aebfb7 2209 spin_lock_bh(&ifp->lock);
0778769d
NT		 2210 ifp->valid_lft = valid_lft;
2211 ifp->prefered_lft = prefered_lft;
2212 ifp->tstamp = jiffies;
06aebfb7 2213 spin_unlock_bh(&ifp->lock);
0778769d 2214
46d48046 2215 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2216 expires, flags);
95c385b4
NH		 2217 /*
2218 * Note that section 3.1 of RFC 4429 indicates
2219 * that the Optimistic flag should not be set for
2220 * manually configured addresses
2221 */
cf22f9a2 2222 addrconf_dad_start(ifp);
1da177e4 2223 in6_ifa_put(ifp);
0778769d 2224 addrconf_verify(0);
1da177e4
LT		 2225 return 0;
2226 }
2227
2228 return PTR_ERR(ifp);
2229}
2230
b71d1d42 2231static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
24ef0da7 2232 unsigned int plen)
1da177e4
LT		 2233{
2234 struct inet6_ifaddr *ifp;
2235 struct inet6_dev *idev;
2236 struct net_device *dev;
1ab1457c 2237
24ef0da7
TG		 2238 if (plen > 128)
2239 return -EINVAL;
2240
af284937
DL		 2241 dev = __dev_get_by_index(net, ifindex);
2242 if (!dev)
1da177e4
LT		 2243 return -ENODEV;
2244
2245 if ((idev = __in6_dev_get(dev)) == NULL)
2246 return -ENXIO;
2247
2248 read_lock_bh(&idev->lock);
502a2ffd 2249 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2250 if (ifp->prefix_len == plen &&
2251 ipv6_addr_equal(pfx, &ifp->addr)) {
2252 in6_ifa_hold(ifp);
2253 read_unlock_bh(&idev->lock);
1ab1457c 2254
1da177e4
LT		 2255 ipv6_del_addr(ifp);
2256
2257 /* If the last address is deleted administratively,
2258 disable IPv6 on this interface.
2259 */
502a2ffd 2260 if (list_empty(&idev->addr_list))
1da177e4
LT		 2261 addrconf_ifdown(idev->dev, 1);
2262 return 0;
2263 }
2264 }
2265 read_unlock_bh(&idev->lock);
2266 return -EADDRNOTAVAIL;
2267}
2268
2269
af284937 2270int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2271{
2272 struct in6_ifreq ireq;
2273 int err;
1ab1457c 2274
1da177e4
LT		 2275 if (!capable(CAP_NET_ADMIN))
2276 return -EPERM;
1ab1457c 2277
1da177e4
LT		 2278 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2279 return -EFAULT;
2280
2281 rtnl_lock();
af284937
DL		 2282 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2283 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2284 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2285 rtnl_unlock();
2286 return err;
2287}
2288
af284937 2289int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2290{
2291 struct in6_ifreq ireq;
2292 int err;
1ab1457c 2293
1da177e4
LT		 2294 if (!capable(CAP_NET_ADMIN))
2295 return -EPERM;
2296
2297 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2298 return -EFAULT;
2299
2300 rtnl_lock();
af284937
DL		 2301 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2302 ireq.ifr6_prefixlen);
1da177e4
LT		 2303 rtnl_unlock();
2304 return err;
2305}
2306
b5f348e5
IJ		 2307static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2308 int plen, int scope)
2309{
2310 struct inet6_ifaddr *ifp;
2311
2312 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2313 if (!IS_ERR(ifp)) {
2314 spin_lock_bh(&ifp->lock);
2315 ifp->flags &= ~IFA_F_TENTATIVE;
2316 spin_unlock_bh(&ifp->lock);
2317 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2318 in6_ifa_put(ifp);
2319 }
2320}
2321
0be669bb 2322#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2323static void sit_add_v4_addrs(struct inet6_dev *idev)
2324{
1da177e4
LT		 2325 struct in6_addr addr;
2326 struct net_device *dev;
c346dca1 2327 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2328 int scope;
2329
2330 ASSERT_RTNL();
2331
2332 memset(&addr, 0, sizeof(struct in6_addr));
2333 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2334
2335 if (idev->dev->flags&IFF_POINTOPOINT) {
2336 addr.s6_addr32[0] = htonl(0xfe800000);
2337 scope = IFA_LINK;
2338 } else {
2339 scope = IPV6_ADDR_COMPATv4;
2340 }
2341
2342 if (addr.s6_addr32[3]) {
b5f348e5 2343 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2344 return;
2345 }
2346
6fda7350 2347 for_each_netdev(net, dev) {
8e5e8f30 2348 struct in_device *in_dev = __in_dev_get_rtnl(dev);
1da177e4 2349 if (in_dev && (dev->flags & IFF_UP)) {
8e5e8f30 2350 struct in_ifaddr *ifa;
1da177e4
LT		 2351
2352 int flag = scope;
2353
2354 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2355 int plen;
2356
2357 addr.s6_addr32[3] = ifa->ifa_local;
2358
2359 if (ifa->ifa_scope == RT_SCOPE_LINK)
2360 continue;
2361 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2362 if (idev->dev->flags&IFF_POINTOPOINT)
2363 continue;
2364 flag |= IFA_HOST;
2365 }
2366 if (idev->dev->flags&IFF_POINTOPOINT)
2367 plen = 64;
2368 else
2369 plen = 96;
2370
b5f348e5 2371 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2372 }
2373 }
1ab1457c 2374 }
1da177e4 2375}
0be669bb 2376#endif
1da177e4
LT		 2377
2378static void init_loopback(struct net_device *dev)
2379{
2380 struct inet6_dev *idev;
1da177e4
LT		 2381
2382 /* ::1 */
2383
2384 ASSERT_RTNL();
2385
2386 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2387 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2388 return;
2389 }
2390
b5f348e5 2391 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2392}
2393
b71d1d42 2394static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4 2395{
8e5e8f30 2396 struct inet6_ifaddr *ifp;
95c385b4
NH		 2397 u32 addr_flags = IFA_F_PERMANENT;
2398
2399#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2400 if (idev->cnf.optimistic_dad &&
702beb87 2401 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2402 addr_flags |= IFA_F_OPTIMISTIC;
2403#endif
1da177e4 2404
95c385b4
NH		 2405
2406 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2407 if (!IS_ERR(ifp)) {
46d48046 2408 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
cf22f9a2 2409 addrconf_dad_start(ifp);
1da177e4
LT		 2410 in6_ifa_put(ifp);
2411 }
2412}
2413
2414static void addrconf_dev_config(struct net_device *dev)
2415{
2416 struct in6_addr addr;
8e5e8f30 2417 struct inet6_dev *idev;
1da177e4
LT		 2418
2419 ASSERT_RTNL();
2420
74235a25
HX		 2421 if ((dev->type != ARPHRD_ETHER) &&
2422 (dev->type != ARPHRD_FDDI) &&
74235a25 2423 (dev->type != ARPHRD_ARCNET) &&
06a4c1c5 2424 (dev->type != ARPHRD_INFINIBAND) &&
2425 (dev->type != ARPHRD_IEEE802154)) {
74235a25
HX		 2426 /* Alas, we support only Ethernet autoconfiguration. */
2427 return;
2428 }
2429
1da177e4 2430 idev = addrconf_add_dev(dev);
64e724f6 2431 if (IS_ERR(idev))
1da177e4
LT		 2432 return;
2433
2434 memset(&addr, 0, sizeof(struct in6_addr));
2435 addr.s6_addr32[0] = htonl(0xFE800000);
2436
2437 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2438 addrconf_add_linklocal(idev, &addr);
2439}
2440
0be669bb 2441#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2442static void addrconf_sit_config(struct net_device *dev)
2443{
2444 struct inet6_dev *idev;
2445
2446 ASSERT_RTNL();
2447
1ab1457c
YH		 2448 /*
2449 * Configure the tunnel with one of our IPv4
2450 * addresses... we should configure all of
1da177e4
LT		 2451 * our v4 addrs in the tunnel
2452 */
2453
2454 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2455 pr_debug("%s: add_dev failed\n", __func__);
1da177e4
LT		 2456 return;
2457 }
2458
c7dc89c0
FT		 2459 if (dev->priv_flags & IFF_ISATAP) {
2460 struct in6_addr addr;
2461
2462 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2463 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2464 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2465 addrconf_add_linklocal(idev, &addr);
2466 return;
2467 }
2468
1da177e4
LT		 2469 sit_add_v4_addrs(idev);
2470
2471 if (dev->flags&IFF_POINTOPOINT) {
2472 addrconf_add_mroute(dev);
2473 addrconf_add_lroute(dev);
2474 } else
2475 sit_route_add(dev);
2476}
0be669bb 2477#endif
1da177e4 2478
aee80b54 2479#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2480static void addrconf_gre_config(struct net_device *dev)
2481{
2482 struct inet6_dev *idev;
2483 struct in6_addr addr;
2484
f3213831 2485 pr_info("%s(%s)\n", __func__, dev->name);
aee80b54 2486
2487 ASSERT_RTNL();
2488
2489 if ((idev = ipv6_find_idev(dev)) == NULL) {
91df42be 2490 pr_debug("%s: add_dev failed\n", __func__);
aee80b54 2491 return;
2492 }
2493
2494 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2495 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2496
2497 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2498 addrconf_add_linklocal(idev, &addr);
2499}
2500#endif
2501
1da177e4
LT		 2502static inline int
2503ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2504{
2505 struct in6_addr lladdr;
2506
95c385b4 2507 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2508 addrconf_add_linklocal(idev, &lladdr);
2509 return 0;
2510 }
2511 return -1;
2512}
2513
2514static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2515{
2516 struct net_device *link_dev;
c346dca1 2517 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2518
2519 /* first try to inherit the link-local address from the link device */
2520 if (idev->dev->iflink &&
6fda7350 2521 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2522 if (!ipv6_inherit_linklocal(idev, link_dev))
2523 return;
2524 }
2525 /* then try to inherit it from any device */
6fda7350 2526 for_each_netdev(net, link_dev) {
1da177e4
LT		 2527 if (!ipv6_inherit_linklocal(idev, link_dev))
2528 return;
2529 }
91df42be 2530 pr_debug("init ip6-ip6: add_linklocal failed\n");
1da177e4
LT		 2531}
2532
2533/*
2534 * Autoconfigure tunnel with a link-local address so routing protocols,
2535 * DHCPv6, MLD etc. can be run over the virtual link
2536 */
2537
2538static void addrconf_ip6_tnl_config(struct net_device *dev)
2539{
2540 struct inet6_dev *idev;
2541
2542 ASSERT_RTNL();
2543
e21e8467 2544 idev = addrconf_add_dev(dev);
64e724f6 2545 if (IS_ERR(idev)) {
91df42be 2546 pr_debug("init ip6-ip6: add_dev failed\n");
1da177e4
LT		 2547 return;
2548 }
2549 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2550}
2551
1ab1457c 2552static int addrconf_notify(struct notifier_block *this, unsigned long event,
8e5e8f30 2553 void *data)
1da177e4
LT		 2554{
2555 struct net_device *dev = (struct net_device *) data;
748e2d93 2556 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2557 int run_pending = 0;
b217d616 2558 int err;
1da177e4 2559
e21e8467 2560 switch (event) {
45ba9dd2 2561 case NETDEV_REGISTER:
74235a25 2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2563 idev = ipv6_add_dev(dev);
2564 if (!idev)
b217d616 2565 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2566 }
2567 break;
bcdd553f 2568
1da177e4 2569 case NETDEV_UP:
3c21edbd 2570 case NETDEV_CHANGE:
c2edacf8
JV		 2571 if (dev->flags & IFF_SLAVE)
2572 break;
2573
3c21edbd 2574 if (event == NETDEV_UP) {
f24e3d65 2575 if (!addrconf_qdisc_ok(dev)) {
3c21edbd 2576 /* device is not ready yet. */
f3213831 2577 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3c21edbd
YH		 2578 dev->name);
2579 break;
2580 }
99081049 2581
d31c7b8f
EP		 2582 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2583 idev = ipv6_add_dev(dev);
2584
e3ec6cfc 2585 if (idev) {
99081049 2586 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2587 run_pending = 1;
2588 }
3c21edbd 2589 } else {
f24e3d65 2590 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2591 /* device is still not ready. */
2592 break;
2593 }
2594
2595 if (idev) {
bcdd553f 2596 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2597 /* device is already configured. */
2598 break;
3c21edbd
YH		 2599 idev->if_flags |= IF_READY;
2600 }
2601
f3213831
JP		 2602 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2603 dev->name);
3c21edbd 2604
c5e33bdd 2605 run_pending = 1;
3c21edbd
YH		 2606 }
2607
e21e8467 2608 switch (dev->type) {
0be669bb 2609#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2610 case ARPHRD_SIT:
2611 addrconf_sit_config(dev);
2612 break;
aee80b54 2613#endif
2614#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2615 case ARPHRD_IPGRE:
2616 addrconf_gre_config(dev);
2617 break;
0be669bb 2618#endif
1da177e4
LT		 2619 case ARPHRD_TUNNEL6:
2620 addrconf_ip6_tnl_config(dev);
2621 break;
2622 case ARPHRD_LOOPBACK:
2623 init_loopback(dev);
2624 break;
2625
2626 default:
2627 addrconf_dev_config(dev);
2628 break;
3ff50b79 2629 }
bcdd553f 2630
1da177e4 2631 if (idev) {
c5e33bdd
YH		 2632 if (run_pending)
2633 addrconf_dad_run(idev);
2634
bcdd553f
SH		 2635 /*
2636 * If the MTU changed during the interface down,
2637 * when the interface up, the changed MTU must be
2638 * reflected in the idev as well as routers.
1da177e4 2639 */
bcdd553f
SH		 2640 if (idev->cnf.mtu6 != dev->mtu &&
2641 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2642 rt6_mtu_change(dev, dev->mtu);
2643 idev->cnf.mtu6 = dev->mtu;
2644 }
2645 idev->tstamp = jiffies;
2646 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2647
2648 /*
2649 * If the changed mtu during down is lower than
2650 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2651 */
2652 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2653 addrconf_ifdown(dev, 1);
1da177e4
LT		 2654 }
2655 break;
2656
2657 case NETDEV_CHANGEMTU:
d31c7b8f 2658 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2659 rt6_mtu_change(dev, dev->mtu);
2660 idev->cnf.mtu6 = dev->mtu;
2661 break;
2662 }
2663
d31c7b8f
EP		 2664 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2665 idev = ipv6_add_dev(dev);
2666 if (idev)
2667 break;
2668 }
2669
bcdd553f
SH		 2670 /*
2671 * MTU falled under IPV6_MIN_MTU.
2672 * Stop IPv6 on this interface.
2673 */
1da177e4
LT		 2674
2675 case NETDEV_DOWN:
2676 case NETDEV_UNREGISTER:
2677 /*
2678 * Remove all addresses from this interface.
2679 */
2680 addrconf_ifdown(dev, event != NETDEV_DOWN);
2681 break;
3c21edbd 2682
1da177e4 2683 case NETDEV_CHANGENAME:
1da177e4 2684 if (idev) {
5632c515 2685 snmp6_unregister_dev(idev);
408c4768 2686 addrconf_sysctl_unregister(idev);
f52295a9 2687 addrconf_sysctl_register(idev);
b217d616
HX		 2688 err = snmp6_register_dev(idev);
2689 if (err)
2690 return notifier_from_errno(err);
5632c515 2691 }
1da177e4 2692 break;
bcdd553f 2693
93d9b7d7
JP		 2694 case NETDEV_PRE_TYPE_CHANGE:
2695 case NETDEV_POST_TYPE_CHANGE:
2696 addrconf_type_change(dev, event);
75c78500 2697 break;
3ff50b79 2698 }
1da177e4
LT		 2699
2700 return NOTIFY_OK;
2701}
2702
2703/*
2704 * addrconf module should be notified of a device going up
2705 */
2706static struct notifier_block ipv6_dev_notf = {
2707 .notifier_call = addrconf_notify,
1da177e4
LT		 2708};
2709
93d9b7d7 2710static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2711{
2712 struct inet6_dev *idev;
2713 ASSERT_RTNL();
2714
2715 idev = __in6_dev_get(dev);
2716
93d9b7d7 2717 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2718 ipv6_mc_remap(idev);
93d9b7d7 2719 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2720 ipv6_mc_unmap(idev);
2721}
2722
1da177e4
LT		 2723static int addrconf_ifdown(struct net_device *dev, int how)
2724{
c346dca1 2725 struct net *net = dev_net(dev);
502a2ffd 2726 struct inet6_dev *idev;
2727 struct inet6_ifaddr *ifa;
73a8bd74 2728 int state, i;
1da177e4
LT		 2729
2730 ASSERT_RTNL();
2731
73a8bd74
DM		 2732 rt6_ifdown(net, dev);
2733 neigh_ifdown(&nd_tbl, dev);
1da177e4
LT		 2734
2735 idev = __in6_dev_get(dev);
2736 if (idev == NULL)
2737 return -ENODEV;
2738
bcdd553f
SH		 2739 /*
2740 * Step 1: remove reference to ipv6 device from parent device.
2741 * Do not dev_put!
1da177e4 2742 */
439e2385 2743 if (how) {
1da177e4 2744 idev->dead = 1;
8814c4b5
YH		 2745
2746 /* protected by rtnl_lock */
a9b3cd7f 2747 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
1da177e4
LT		 2748
2749 /* Step 1.5: remove snmp6 entry */
2750 snmp6_unregister_dev(idev);
2751
2752 }
2753
73a8bd74
DM		 2754 /* Step 2: clear hash table */
2755 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2756 struct hlist_head *h = &inet6_addr_lst[i];
2757 struct hlist_node *n;
2758
2759 spin_lock_bh(&addrconf_hash_lock);
2760 restart:
2761 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2762 if (ifa->idev == idev) {
2763 hlist_del_init_rcu(&ifa->addr_lst);
2764 addrconf_del_timer(ifa);
2765 goto restart;
2766 }
2767 }
2768 spin_unlock_bh(&addrconf_hash_lock);
2769 }
2770
1da177e4
LT		 2771 write_lock_bh(&idev->lock);
2772
bcdd553f 2773 /* Step 2: clear flags for stateless addrconf */
439e2385 2774 if (!how)
3c21edbd 2775 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2776
1da177e4 2777#ifdef CONFIG_IPV6_PRIVACY
439e2385 2778 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2779 in6_dev_put(idev);
2780
bcdd553f 2781 /* Step 3: clear tempaddr list */
372e6c8f 2782 while (!list_empty(&idev->tempaddr_list)) {
2783 ifa = list_first_entry(&idev->tempaddr_list,
2784 struct inet6_ifaddr, tmp_list);
2785 list_del(&ifa->tmp_list);
1da177e4
LT		 2786 write_unlock_bh(&idev->lock);
2787 spin_lock_bh(&ifa->lock);
2788
2789 if (ifa->ifpub) {
2790 in6_ifa_put(ifa->ifpub);
2791 ifa->ifpub = NULL;
2792 }
2793 spin_unlock_bh(&ifa->lock);
2794 in6_ifa_put(ifa);
2795 write_lock_bh(&idev->lock);
2796 }
2797#endif
8f37ada5 2798
502a2ffd 2799 while (!list_empty(&idev->addr_list)) {
2800 ifa = list_first_entry(&idev->addr_list,
2801 struct inet6_ifaddr, if_list);
84e8b803 2802 addrconf_del_timer(ifa);
2803
73a8bd74 2804 list_del(&ifa->if_list);
84e8b803 2805
73a8bd74 2806 write_unlock_bh(&idev->lock);
84e8b803 2807
73a8bd74
DM		 2808 spin_lock_bh(&ifa->state_lock);
2809 state = ifa->state;
2810 ifa->state = INET6_IFADDR_STATE_DEAD;
2811 spin_unlock_bh(&ifa->state_lock);
9d82ca98 2812
73a8bd74
DM		 2813 if (state != INET6_IFADDR_STATE_DEAD) {
2814 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2815 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
27bdb2ab 2816 }
73a8bd74 2817 in6_ifa_put(ifa);
8f37ada5 2818
73a8bd74
DM		 2819 write_lock_bh(&idev->lock);
2820 }
8f37ada5 2821
1da177e4
LT		 2822 write_unlock_bh(&idev->lock);
2823
2824 /* Step 5: Discard multicast list */
439e2385 2825 if (how)
1da177e4
LT		 2826 ipv6_mc_destroy_dev(idev);
2827 else
2828 ipv6_mc_down(idev);
2829
1da177e4 2830 idev->tstamp = jiffies;
1ab1457c 2831
bcdd553f 2832 /* Last: Shot the device (if unregistered) */
439e2385 2833 if (how) {
408c4768 2834 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2835 neigh_parms_release(&nd_tbl, idev->nd_parms);
2836 neigh_ifdown(&nd_tbl, dev);
2837 in6_dev_put(idev);
2838 }
2839 return 0;
2840}
2841
2842static void addrconf_rs_timer(unsigned long data)
2843{
2844 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2845 struct inet6_dev *idev = ifp->idev;
1da177e4 2846
5b2a1953 2847 read_lock(&idev->lock);
2848 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2849 goto out;
2850
5b2a1953 2851 if (idev->cnf.forwarding)
2852 goto out;
2853
2854 /* Announcement received after solicitation was sent */
2855 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2856 goto out;
1da177e4
LT		 2857
2858 spin_lock(&ifp->lock);
5b2a1953 2859 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2860 /* The wait after the last probe can be shorter */
2861 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2862 (ifp->probes == idev->cnf.rtr_solicits) ?
2863 idev->cnf.rtr_solicit_delay :
2864 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2865 spin_unlock(&ifp->lock);
2866
5b2a1953 2867 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2868 } else {
2869 spin_unlock(&ifp->lock);
2870 /*
2871 * Note: we do not support deprecated "all on-link"
2872 * assumption any longer.
2873 */
91df42be 2874 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
1da177e4
LT		 2875 }
2876
2877out:
5b2a1953 2878 read_unlock(&idev->lock);
1da177e4
LT		 2879 in6_ifa_put(ifp);
2880}
2881
2882/*
2883 * Duplicate Address Detection
2884 */
3c21edbd
YH		 2885static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2886{
2887 unsigned long rand_num;
2888 struct inet6_dev *idev = ifp->idev;
2889
95c385b4
NH		 2890 if (ifp->flags & IFA_F_OPTIMISTIC)
2891 rand_num = 0;
2892 else
2893 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2894
3c21edbd
YH		 2895 ifp->probes = idev->cnf.dad_transmits;
2896 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2897}
2898
cf22f9a2 2899static void addrconf_dad_start(struct inet6_ifaddr *ifp)
1da177e4
LT		 2900{
2901 struct inet6_dev *idev = ifp->idev;
2902 struct net_device *dev = idev->dev;
1da177e4
LT		 2903
2904 addrconf_join_solict(dev, &ifp->addr);
2905
1da177e4 2906 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2907
2908 read_lock_bh(&idev->lock);
622ccdf1 2909 spin_lock(&ifp->lock);
e9d3e084 2910 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2911 goto out;
1da177e4
LT		 2912
2913 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2914 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2915 !(ifp->flags&IFA_F_TENTATIVE) ||
2916 ifp->flags & IFA_F_NODAD) {
cc411d0b 2917 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2918 spin_unlock(&ifp->lock);
1da177e4
LT		 2919 read_unlock_bh(&idev->lock);
2920
2921 addrconf_dad_completed(ifp);
2922 return;
2923 }
2924
6732bade 2925 if (!(idev->if_flags & IF_READY)) {
21809faf 2926 spin_unlock(&ifp->lock);
6732bade 2927 read_unlock_bh(&idev->lock);
3c21edbd 2928 /*
590a9887 2929 * If the device is not ready:
3c21edbd
YH		 2930 * - keep it tentative if it is a permanent address.
2931 * - otherwise, kill it.
2932 */
2933 in6_ifa_hold(ifp);
cc411d0b 2934 addrconf_dad_stop(ifp, 0);
6732bade 2935 return;
3c21edbd 2936 }
95c385b4
NH		 2937
2938 /*
2939 * Optimistic nodes can start receiving
2940 * Frames right away
2941 */
e21e8467 2942 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2943 ip6_ins_rt(ifp->rt);
2944
6732bade 2945 addrconf_dad_kick(ifp);
1da177e4 2946out:
622ccdf1 2947 spin_unlock(&ifp->lock);
1da177e4
LT		 2948 read_unlock_bh(&idev->lock);
2949}
2950
2951static void addrconf_dad_timer(unsigned long data)
2952{
2953 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2954 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2955 struct in6_addr mcaddr;
2956
f2344a13
HX		 2957 if (!ifp->probes && addrconf_dad_end(ifp))
2958 goto out;
2959
122e4519 2960 read_lock(&idev->lock);
2961 if (idev->dead || !(idev->if_flags & IF_READY)) {
2962 read_unlock(&idev->lock);
1da177e4
LT		 2963 goto out;
2964 }
21809faf 2965
2966 spin_lock(&ifp->lock);
622ccdf1
HX		 2967 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2968 spin_unlock(&ifp->lock);
2969 read_unlock(&idev->lock);
2970 goto out;
2971 }
2972
1da177e4
LT		 2973 if (ifp->probes == 0) {
2974 /*
2975 * DAD was successful
2976 */
2977
cc411d0b 2978 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2979 spin_unlock(&ifp->lock);
122e4519 2980 read_unlock(&idev->lock);
1da177e4
LT		 2981
2982 addrconf_dad_completed(ifp);
2983
2984 goto out;
2985 }
2986
2987 ifp->probes--;
2988 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2989 spin_unlock(&ifp->lock);
122e4519 2990 read_unlock(&idev->lock);
1da177e4
LT		 2991
2992 /* send a neighbour solicitation for our addr */
1da177e4 2993 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2994 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2995out:
2996 in6_ifa_put(ifp);
2997}
2998
2999static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3000{
e21e8467 3001 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 3002
3003 /*
3004 * Configure the address for reception. Now it is valid.
3005 */
3006
3007 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3008
026359bc
TA		 3009 /* If added prefix is link local and we are prepared to process
3010 router advertisements, start sending router solicitations.
1da177e4
LT		 3011 */
3012
026359bc
TA		 3013 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3014 ifp->idev->cnf.accept_ra == 2) &&
1da177e4
LT		 3015 ifp->idev->cnf.rtr_solicits > 0 &&
3016 (dev->flags&IFF_LOOPBACK) == 0 &&
3017 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 3018 /*
3019 * If a host as already performed a random delay
3020 * [...] as part of DAD [...] there is no need
3021 * to delay again before sending the first RS
3022 */
f3ee4010 3023 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 3024
3025 spin_lock_bh(&ifp->lock);
3026 ifp->probes = 1;
3027 ifp->idev->if_flags |= IF_RS_SENT;
3028 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3029 spin_unlock_bh(&ifp->lock);
3030 }
3031}
3032
e21e8467
SH		 3033static void addrconf_dad_run(struct inet6_dev *idev)
3034{
c5e33bdd
YH		 3035 struct inet6_ifaddr *ifp;
3036
3037 read_lock_bh(&idev->lock);
502a2ffd 3038 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 3039 spin_lock(&ifp->lock);
f2344a13
HX		 3040 if (ifp->flags & IFA_F_TENTATIVE &&
3041 ifp->state == INET6_IFADDR_STATE_DAD)
3042 addrconf_dad_kick(ifp);
21809faf 3043 spin_unlock(&ifp->lock);
c5e33bdd
YH		 3044 }
3045 read_unlock_bh(&idev->lock);
3046}
3047
1da177e4
LT		 3048#ifdef CONFIG_PROC_FS
3049struct if6_iter_state {
3c40090a 3050 struct seq_net_private p;
1da177e4 3051 int bucket;
1d578303 3052 int offset;
1da177e4
LT		 3053};
3054
1d578303 3055static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
1da177e4
LT		 3056{
3057 struct inet6_ifaddr *ifa = NULL;
3058 struct if6_iter_state *state = seq->private;
1218854a 3059 struct net *net = seq_file_net(seq);
1d578303 3060 int p = 0;
1da177e4 3061
1d578303
MM		 3062 /* initial bucket if pos is 0 */
3063 if (pos == 0) {
3064 state->bucket = 0;
3065 state->offset = 0;
3066 }
3067
3068 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3069 struct hlist_node *n;
4f70ecca 3070 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
1d578303
MM		 3071 addr_lst) {
3072 /* sync with offset */
3073 if (p < state->offset) {
3074 p++;
3075 continue;
3076 }
3077 state->offset++;
c2e21293 3078 if (net_eq(dev_net(ifa->idev->dev), net))
3079 return ifa;
1d578303
MM		 3080 }
3081
3082 /* prepare for next bucket */
3083 state->offset = 0;
3084 p = 0;
1da177e4 3085 }
c2e21293 3086 return NULL;
1da177e4
LT		 3087}
3088
c2e21293 3089static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3090 struct inet6_ifaddr *ifa)
1da177e4
LT		 3091{
3092 struct if6_iter_state *state = seq->private;
1218854a 3093 struct net *net = seq_file_net(seq);
c2e21293 3094 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3095
1d578303
MM		 3096 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3097 state->offset++;
c2e21293 3098 if (net_eq(dev_net(ifa->idev->dev), net))
3099 return ifa;
1d578303 3100 }
3c40090a 3101
c2e21293 3102 while (++state->bucket < IN6_ADDR_HSIZE) {
1d578303 3103 state->offset = 0;
4f70ecca 3104 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3105 &inet6_addr_lst[state->bucket], addr_lst) {
1d578303 3106 state->offset++;
c2e21293 3107 if (net_eq(dev_net(ifa->idev->dev), net))
3108 return ifa;
3109 }
1da177e4 3110 }
3c40090a 3111
c2e21293 3112 return NULL;
1da177e4
LT		 3113}
3114
1da177e4 3115static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3116 __acquires(rcu_bh)
1da177e4 3117{
5c578aed 3118 rcu_read_lock_bh();
1d578303 3119 return if6_get_first(seq, *pos);
1da177e4
LT		 3120}
3121
3122static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3123{
3124 struct inet6_ifaddr *ifa;
3125
3126 ifa = if6_get_next(seq, v);
3127 ++*pos;
3128 return ifa;
3129}
3130
3131static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3132 __releases(rcu_bh)
1da177e4 3133{
5c578aed 3134 rcu_read_unlock_bh();
1da177e4
LT		 3135}
3136
3137static int if6_seq_show(struct seq_file *seq, void *v)
3138{
3139 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3140 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3141 &ifp->addr,
1da177e4
LT		 3142 ifp->idev->dev->ifindex,
3143 ifp->prefix_len,
3144 ifp->scope,
3145 ifp->flags,
3146 ifp->idev->dev->name);
3147 return 0;
3148}
3149
56b3d975 3150static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3151 .start = if6_seq_start,
3152 .next = if6_seq_next,
3153 .show = if6_seq_show,
3154 .stop = if6_seq_stop,
3155};
3156
3157static int if6_seq_open(struct inode *inode, struct file *file)
3158{
3c40090a
DL		 3159 return seq_open_net(inode, file, &if6_seq_ops,
3160 sizeof(struct if6_iter_state));
1da177e4
LT		 3161}
3162
9a32144e 3163static const struct file_operations if6_fops = {
1da177e4
LT		 3164 .owner = THIS_MODULE,
3165 .open = if6_seq_open,
3166 .read = seq_read,
3167 .llseek = seq_lseek,
3c40090a 3168 .release = seq_release_net,
1da177e4
LT		 3169};
3170
2c8c1e72 3171static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3172{
3c40090a 3173 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3174 return -ENOMEM;
3175 return 0;
3176}
3177
2c8c1e72 3178static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3179{
3180 proc_net_remove(net, "if_inet6");
3181}
3182
3183static struct pernet_operations if6_proc_net_ops = {
3184 .init = if6_proc_net_init,
3185 .exit = if6_proc_net_exit,
3186};
3187
3188int __init if6_proc_init(void)
3189{
3190 return register_pernet_subsys(&if6_proc_net_ops);
3191}
3192
1da177e4
LT		 3193void if6_proc_exit(void)
3194{
3c40090a 3195 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3196}
3197#endif /* CONFIG_PROC_FS */
3198
59fbb3a6 3199#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3200/* Check if address is a home address configured on any interface. */
b71d1d42 3201int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3b9f9a1c
NT		 3202{
3203 int ret = 0;
c2e21293 3204 struct inet6_ifaddr *ifp = NULL;
3205 struct hlist_node *n;
ddbe5032 3206 unsigned int hash = inet6_addr_hash(addr);
c2e21293 3207
5c578aed 3208 rcu_read_lock_bh();
4f70ecca 3209 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3210 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3211 continue;
caad295f 3212 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3213 (ifp->flags & IFA_F_HOMEADDRESS)) {
3214 ret = 1;
3215 break;
3216 }
3217 }
5c578aed 3218 rcu_read_unlock_bh();
3b9f9a1c
NT		 3219 return ret;
3220}
3221#endif
3222
1da177e4
LT		 3223/*
3224 * Periodic address status verification
3225 */
3226
3227static void addrconf_verify(unsigned long foo)
3228{
b2db7564 3229 unsigned long now, next, next_sec, next_sched;
1da177e4 3230 struct inet6_ifaddr *ifp;
c2e21293 3231 struct hlist_node *node;
1da177e4
LT		 3232 int i;
3233
5c578aed 3234 rcu_read_lock_bh();
3235 spin_lock(&addrconf_verify_lock);
1da177e4 3236 now = jiffies;
b2db7564 3237 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3238
3239 del_timer(&addr_chk_timer);
3240
bcdd553f 3241 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3242restart:
4f70ecca 3243 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3244 &inet6_addr_lst[i], addr_lst) {
1da177e4 3245 unsigned long age;
1da177e4
LT		 3246
3247 if (ifp->flags & IFA_F_PERMANENT)
3248 continue;
3249
3250 spin_lock(&ifp->lock);
b2db7564
YH		 3251 /* We try to batch several events at once. */
3252 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3253
8f27ebb9
YH		 3254 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3255 age >= ifp->valid_lft) {
1da177e4
LT		 3256 spin_unlock(&ifp->lock);
3257 in6_ifa_hold(ifp);
1da177e4
LT		 3258 ipv6_del_addr(ifp);
3259 goto restart;
8f27ebb9
YH		 3260 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3261 spin_unlock(&ifp->lock);
3262 continue;
1da177e4 3263 } else if (age >= ifp->prefered_lft) {
a1ed0526 3264 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3265 int deprecate = 0;
3266
3267 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3268 deprecate = 1;
3269 ifp->flags |= IFA_F_DEPRECATED;
3270 }
3271
3272 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3273 next = ifp->tstamp + ifp->valid_lft * HZ;
3274
3275 spin_unlock(&ifp->lock);
3276
3277 if (deprecate) {
3278 in6_ifa_hold(ifp);
1da177e4
LT		 3279
3280 ipv6_ifa_notify(0, ifp);
3281 in6_ifa_put(ifp);
3282 goto restart;
3283 }
3284#ifdef CONFIG_IPV6_PRIVACY
3285 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3286 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3287 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3288 ifp->idev->cnf.dad_transmits *
3289 ifp->idev->nd_parms->retrans_time / HZ;
3290
1da177e4
LT		 3291 if (age >= ifp->prefered_lft - regen_advance) {
3292 struct inet6_ifaddr *ifpub = ifp->ifpub;
3293 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3294 next = ifp->tstamp + ifp->prefered_lft * HZ;
3295 if (!ifp->regen_count && ifpub) {
3296 ifp->regen_count++;
3297 in6_ifa_hold(ifp);
3298 in6_ifa_hold(ifpub);
3299 spin_unlock(&ifp->lock);
5c578aed 3300
291d809b
HY		 3301 spin_lock(&ifpub->lock);
3302 ifpub->regen_count = 0;
3303 spin_unlock(&ifpub->lock);
1da177e4
LT		 3304 ipv6_create_tempaddr(ifpub, ifp);
3305 in6_ifa_put(ifpub);
3306 in6_ifa_put(ifp);
3307 goto restart;
3308 }
3309 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3310 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3311 spin_unlock(&ifp->lock);
3312#endif
3313 } else {
3314 /* ifp->prefered_lft <= ifp->valid_lft */
3315 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3316 next = ifp->tstamp + ifp->prefered_lft * HZ;
3317 spin_unlock(&ifp->lock);
3318 }
3319 }
1da177e4
LT		 3320 }
3321
b2db7564
YH		 3322 next_sec = round_jiffies_up(next);
3323 next_sched = next;
3324
3325 /* If rounded timeout is accurate enough, accept it. */
3326 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3327 next_sched = next_sec;
3328
3329 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3330 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3331 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3332
3333 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3334 now, next, next_sec, next_sched));
3335
3336 addr_chk_timer.expires = next_sched;
1da177e4 3337 add_timer(&addr_chk_timer);
5c578aed 3338 spin_unlock(&addrconf_verify_lock);
3339 rcu_read_unlock_bh();
1da177e4
LT		 3340}
3341
461d8837
TG		 3342static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3343{
3344 struct in6_addr *pfx = NULL;
3345
3346 if (addr)
3347 pfx = nla_data(addr);
3348
3349 if (local) {
3350 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3351 pfx = NULL;
3352 else
3353 pfx = nla_data(local);
3354 }
3355
3356 return pfx;
3357}
3358
ef7c79ed 3359static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3360 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3361 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3362 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3363};
3364
1da177e4
LT		 3365static int
3366inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3367{
3b1e0a65 3368 struct net *net = sock_net(skb->sk);
b933f716
TG		 3369 struct ifaddrmsg *ifm;
3370 struct nlattr *tb[IFA_MAX+1];
1da177e4 3371 struct in6_addr *pfx;
b933f716 3372 int err;
1da177e4 3373
b933f716
TG		 3374 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3375 if (err < 0)
3376 return err;
3377
3378 ifm = nlmsg_data(nlh);
3379 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3380 if (pfx == NULL)
3381 return -EINVAL;
3382
af284937 3383 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3384}
3385
55ebaef1
NT		 3386static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3387 u32 prefered_lft, u32 valid_lft)
081bba5b 3388{
6f704992
YH		 3389 u32 flags;
3390 clock_t expires;
4bed72e4 3391 unsigned long timeout;
46d48046 3392
081bba5b
NT		 3393 if (!valid_lft || (prefered_lft > valid_lft))
3394 return -EINVAL;
3395
4bed72e4
YH		 3396 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3397 if (addrconf_finite_timeout(timeout)) {
3398 expires = jiffies_to_clock_t(timeout * HZ);
3399 valid_lft = timeout;
6f704992 3400 flags = RTF_EXPIRES;
4bed72e4
YH		 3401 } else {
3402 expires = 0;
3403 flags = 0;
3404 ifa_flags |= IFA_F_PERMANENT;
6f704992 3405 }
081bba5b 3406
4bed72e4
YH		 3407 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3408 if (addrconf_finite_timeout(timeout)) {
3409 if (timeout == 0)
3410 ifa_flags |= IFA_F_DEPRECATED;
3411 prefered_lft = timeout;
3412 }
081bba5b
NT		 3413
3414 spin_lock_bh(&ifp->lock);
3b9f9a1c 3415 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3416 ifp->tstamp = jiffies;
3417 ifp->valid_lft = valid_lft;
3418 ifp->prefered_lft = prefered_lft;
3419
3420 spin_unlock_bh(&ifp->lock);
3421 if (!(ifp->flags&IFA_F_TENTATIVE))
3422 ipv6_ifa_notify(0, ifp);
081bba5b 3423
46d48046 3424 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3425 expires, flags);
081bba5b
NT		 3426 addrconf_verify(0);
3427
3428 return 0;
3429}
3430
1da177e4
LT		 3431static int
3432inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3433{
3b1e0a65 3434 struct net *net = sock_net(skb->sk);
461d8837
TG		 3435 struct ifaddrmsg *ifm;
3436 struct nlattr *tb[IFA_MAX+1];
1da177e4 3437 struct in6_addr *pfx;
7198f8ce
TG		 3438 struct inet6_ifaddr *ifa;
3439 struct net_device *dev;
55ebaef1
NT		 3440 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3441 u8 ifa_flags;
461d8837 3442 int err;
1da177e4 3443
461d8837
TG		 3444 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3445 if (err < 0)
3446 return err;
3447
3448 ifm = nlmsg_data(nlh);
3449 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3450 if (pfx == NULL)
3451 return -EINVAL;
3452
461d8837 3453 if (tb[IFA_CACHEINFO]) {
0778769d 3454 struct ifa_cacheinfo *ci;
461d8837
TG		 3455
3456 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3457 valid_lft = ci->ifa_valid;
461d8837
TG		 3458 preferred_lft = ci->ifa_prefered;
3459 } else {
3460 preferred_lft = INFINITY_LIFE_TIME;
3461 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3462 }
3463
af284937 3464 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3465 if (dev == NULL)
3466 return -ENODEV;
3467
55ebaef1 3468 /* We ignore other flags so far. */
3b9f9a1c 3469 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3470
1cab3da6 3471 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3472 if (ifa == NULL) {
3473 /*
3474 * It would be best to check for !NLM_F_CREATE here but
3475 * userspace alreay relies on not having to provide this.
3476 */
af284937
DL		 3477 return inet6_addr_add(net, ifm->ifa_index, pfx,
3478 ifm->ifa_prefixlen, ifa_flags,
3479 preferred_lft, valid_lft);
081bba5b
NT		 3480 }
3481
7198f8ce
TG		 3482 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3483 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3484 err = -EEXIST;
3485 else
55ebaef1 3486 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3487
3488 in6_ifa_put(ifa);
3489
3490 return err;
1da177e4
LT		 3491}
3492
101bb229
TG		 3493static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3494 u8 scope, int ifindex)
3495{
3496 struct ifaddrmsg *ifm;
3497
3498 ifm = nlmsg_data(nlh);
3499 ifm->ifa_family = AF_INET6;
3500 ifm->ifa_prefixlen = prefixlen;
3501 ifm->ifa_flags = flags;
3502 ifm->ifa_scope = scope;
3503 ifm->ifa_index = ifindex;
3504}
3505
85486af0
TG		 3506static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3507 unsigned long tstamp, u32 preferred, u32 valid)
3508{
3509 struct ifa_cacheinfo ci;
3510
18a31e1e
TG		 3511 ci.cstamp = cstamp_delta(cstamp);
3512 ci.tstamp = cstamp_delta(tstamp);
85486af0
TG		 3513 ci.ifa_prefered = preferred;
3514 ci.ifa_valid = valid;
3515
3516 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3517}
3518
101bb229
TG		 3519static inline int rt_scope(int ifa_scope)
3520{
3521 if (ifa_scope & IFA_HOST)
3522 return RT_SCOPE_HOST;
3523 else if (ifa_scope & IFA_LINK)
3524 return RT_SCOPE_LINK;
3525 else if (ifa_scope & IFA_SITE)
3526 return RT_SCOPE_SITE;
3527 else
3528 return RT_SCOPE_UNIVERSE;
3529}
3530
0ab6803b
TG		 3531static inline int inet6_ifaddr_msgsize(void)
3532{
339bf98f
TG		 3533 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3534 + nla_total_size(16) /* IFA_ADDRESS */
3535 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3536}
c5396a31 3537
1da177e4 3538static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
15e47304 3539 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3540{
1da177e4 3541 struct nlmsghdr *nlh;
85486af0 3542 u32 preferred, valid;
1da177e4 3543
15e47304 3544 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3545 if (nlh == NULL)
26932566 3546 return -EMSGSIZE;
0ab6803b 3547
101bb229
TG		 3548 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3549 ifa->idev->dev->ifindex);
3550
1da177e4 3551 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3552 preferred = ifa->prefered_lft;
3553 valid = ifa->valid_lft;
3554 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3555 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3556 if (preferred > tval)
3557 preferred -= tval;
3558 else
3559 preferred = 0;
f56619fc
BH		 3560 if (valid != INFINITY_LIFE_TIME) {
3561 if (valid > tval)
3562 valid -= tval;
3563 else
3564 valid = 0;
3565 }
1da177e4
LT		 3566 }
3567 } else {
85486af0
TG		 3568 preferred = INFINITY_LIFE_TIME;
3569 valid = INFINITY_LIFE_TIME;
3570 }
3571
0ab6803b 3572 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3573 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3574 nlmsg_cancel(skb, nlh);
3575 return -EMSGSIZE;
3576 }
1da177e4 3577
0ab6803b 3578 return nlmsg_end(skb, nlh);
1da177e4
LT		 3579}
3580
3581static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
15e47304 3582 u32 portid, u32 seq, int event, u16 flags)
1da177e4 3583{
1da177e4 3584 struct nlmsghdr *nlh;
101bb229
TG		 3585 u8 scope = RT_SCOPE_UNIVERSE;
3586 int ifindex = ifmca->idev->dev->ifindex;
3587
3588 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3589 scope = RT_SCOPE_SITE;
1da177e4 3590
15e47304 3591 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3592 if (nlh == NULL)
26932566 3593 return -EMSGSIZE;
85486af0 3594
0ab6803b
TG		 3595 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3596 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3597 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3598 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3599 nlmsg_cancel(skb, nlh);
3600 return -EMSGSIZE;
3601 }
85486af0 3602
0ab6803b 3603 return nlmsg_end(skb, nlh);
1da177e4
LT		 3604}
3605
3606static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
15e47304 3607 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 3608{
1da177e4 3609 struct nlmsghdr *nlh;
101bb229
TG		 3610 u8 scope = RT_SCOPE_UNIVERSE;
3611 int ifindex = ifaca->aca_idev->dev->ifindex;
3612
3613 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3614 scope = RT_SCOPE_SITE;
1da177e4 3615
15e47304 3616 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
0ab6803b 3617 if (nlh == NULL)
26932566 3618 return -EMSGSIZE;
85486af0 3619
0ab6803b
TG		 3620 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3621 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3622 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3623 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3624 nlmsg_cancel(skb, nlh);
3625 return -EMSGSIZE;
3626 }
1da177e4 3627
0ab6803b 3628 return nlmsg_end(skb, nlh);
1da177e4
LT		 3629}
3630
e21e8467 3631enum addr_type_t {
1da177e4
LT		 3632 UNICAST_ADDR,
3633 MULTICAST_ADDR,
3634 ANYCAST_ADDR,
3635};
3636
234b27c3
ED		 3637/* called with rcu_read_lock() */
3638static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3639 struct netlink_callback *cb, enum addr_type_t type,
3640 int s_ip_idx, int *p_ip_idx)
3641{
234b27c3
ED		 3642 struct ifmcaddr6 *ifmca;
3643 struct ifacaddr6 *ifaca;
3644 int err = 1;
3645 int ip_idx = *p_ip_idx;
3646
3647 read_lock_bh(&idev->lock);
3648 switch (type) {
502a2ffd 3649 case UNICAST_ADDR: {
3650 struct inet6_ifaddr *ifa;
3651
234b27c3 3652 /* unicast address incl. temp addr */
502a2ffd 3653 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3654 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3655 continue;
3656 err = inet6_fill_ifaddr(skb, ifa,
15e47304 3657 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3658 cb->nlh->nlmsg_seq,
3659 RTM_NEWADDR,
3660 NLM_F_MULTI);
3661 if (err <= 0)
3662 break;
3663 }
3664 break;
502a2ffd 3665 }
234b27c3
ED		 3666 case MULTICAST_ADDR:
3667 /* multicast address */
3668 for (ifmca = idev->mc_list; ifmca;
3669 ifmca = ifmca->next, ip_idx++) {
3670 if (ip_idx < s_ip_idx)
3671 continue;
3672 err = inet6_fill_ifmcaddr(skb, ifmca,
15e47304 3673 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3674 cb->nlh->nlmsg_seq,
3675 RTM_GETMULTICAST,
3676 NLM_F_MULTI);
3677 if (err <= 0)
3678 break;
3679 }
3680 break;
3681 case ANYCAST_ADDR:
3682 /* anycast address */
3683 for (ifaca = idev->ac_list; ifaca;
3684 ifaca = ifaca->aca_next, ip_idx++) {
3685 if (ip_idx < s_ip_idx)
3686 continue;
3687 err = inet6_fill_ifacaddr(skb, ifaca,
15e47304 3688 NETLINK_CB(cb->skb).portid,
234b27c3
ED		 3689 cb->nlh->nlmsg_seq,
3690 RTM_GETANYCAST,
3691 NLM_F_MULTI);
3692 if (err <= 0)
3693 break;
3694 }
3695 break;
3696 default:
3697 break;
3698 }
3699 read_unlock_bh(&idev->lock);
3700 *p_ip_idx = ip_idx;
3701 return err;
3702}
3703
1da177e4
LT		 3704static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3705 enum addr_type_t type)
3706{
234b27c3
ED		 3707 struct net *net = sock_net(skb->sk);
3708 int h, s_h;
1da177e4
LT		 3709 int idx, ip_idx;
3710 int s_idx, s_ip_idx;
1da177e4 3711 struct net_device *dev;
234b27c3
ED		 3712 struct inet6_dev *idev;
3713 struct hlist_head *head;
3714 struct hlist_node *node;
1ab1457c 3715
234b27c3
ED		 3716 s_h = cb->args[0];
3717 s_idx = idx = cb->args[1];
3718 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3719
234b27c3
ED		 3720 rcu_read_lock();
3721 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3722 idx = 0;
3723 head = &net->dev_index_head[h];
3724 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3725 if (idx < s_idx)
3726 goto cont;
4b97efdf 3727 if (h > s_h || idx > s_idx)
234b27c3
ED		 3728 s_ip_idx = 0;
3729 ip_idx = 0;
e21e8467
SH		 3730 idev = __in6_dev_get(dev);
3731 if (!idev)
234b27c3
ED		 3732 goto cont;
3733
3734 if (in6_dump_addrs(idev, skb, cb, type,
3735 s_ip_idx, &ip_idx) <= 0)
3736 goto done;
7562f876 3737cont:
234b27c3
ED		 3738 idx++;
3739 }
1da177e4 3740 }
234b27c3
ED		 3741done:
3742 rcu_read_unlock();
3743 cb->args[0] = h;
3744 cb->args[1] = idx;
3745 cb->args[2] = ip_idx;
3746
1da177e4
LT		 3747 return skb->len;
3748}
3749
3750static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3751{
3752 enum addr_type_t type = UNICAST_ADDR;
b854272b 3753
1da177e4
LT		 3754 return inet6_dump_addr(skb, cb, type);
3755}
3756
3757static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3758{
3759 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3760
1da177e4
LT		 3761 return inet6_dump_addr(skb, cb, type);
3762}
3763
3764
3765static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3766{
3767 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3768
1da177e4
LT		 3769 return inet6_dump_addr(skb, cb, type);
3770}
3771
8e5e8f30 3772static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
1b29fc2c 3773 void *arg)
6c223828 3774{
3b1e0a65 3775 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3776 struct ifaddrmsg *ifm;
3777 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3778 struct in6_addr *addr = NULL;
3779 struct net_device *dev = NULL;
3780 struct inet6_ifaddr *ifa;
3781 struct sk_buff *skb;
6c223828
NT		 3782 int err;
3783
1b29fc2c
TG		 3784 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3785 if (err < 0)
3786 goto errout;
3787
3788 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3789 if (addr == NULL) {
3790 err = -EINVAL;
3791 goto errout;
6c223828 3792 }
6c223828 3793
1b29fc2c 3794 ifm = nlmsg_data(nlh);
6c223828 3795 if (ifm->ifa_index)
6fda7350 3796 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3797
e21e8467
SH		 3798 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3799 if (!ifa) {
1b29fc2c
TG		 3800 err = -EADDRNOTAVAIL;
3801 goto errout;
3802 }
6c223828 3803
e21e8467
SH		 3804 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3805 if (!skb) {
6c223828 3806 err = -ENOBUFS;
1b29fc2c 3807 goto errout_ifa;
6c223828
NT		 3808 }
3809
15e47304 3810 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
6c223828 3811 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3812 if (err < 0) {
3813 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3814 WARN_ON(err == -EMSGSIZE);
3815 kfree_skb(skb);
3816 goto errout_ifa;
3817 }
15e47304 3818 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
1b29fc2c 3819errout_ifa:
6c223828 3820 in6_ifa_put(ifa);
1b29fc2c 3821errout:
6c223828 3822 return err;
6c223828
NT		 3823}
3824
1da177e4
LT		 3825static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3826{
3827 struct sk_buff *skb;
c346dca1 3828 struct net *net = dev_net(ifa->idev->dev);
5d620266 3829 int err = -ENOBUFS;
1da177e4 3830
0ab6803b 3831 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3832 if (skb == NULL)
3833 goto errout;
3834
3835 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3836 if (err < 0) {
3837 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3838 WARN_ON(err == -EMSGSIZE);
3839 kfree_skb(skb);
3840 goto errout;
3841 }
1ce85fe4
PNA		 3842 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3843 return;
5d620266
TG		 3844errout:
3845 if (err < 0)
6fda7350 3846 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3847}
3848
b6f99a21 3849static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3850 __s32 *array, int bytes)
3851{
04561c1f
TG		 3852 BUG_ON(bytes < (DEVCONF_MAX * 4));
3853
1da177e4
LT		 3854 memset(array, 0, bytes);
3855 array[DEVCONF_FORWARDING] = cnf->forwarding;
3856 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3857 array[DEVCONF_MTU6] = cnf->mtu6;
3858 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3859 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3860 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3861 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3862 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
93908d19
TG		 3863 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3864 jiffies_to_msecs(cnf->rtr_solicit_interval);
3865 array[DEVCONF_RTR_SOLICIT_DELAY] =
3866 jiffies_to_msecs(cnf->rtr_solicit_delay);
1da177e4
LT		 3867 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3868#ifdef CONFIG_IPV6_PRIVACY
3869 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3870 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3871 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3872 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3873 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3874#endif
3875 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3876 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3877 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3878#ifdef CONFIG_IPV6_ROUTER_PREF
3879 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
93908d19
TG		 3880 array[DEVCONF_RTR_PROBE_INTERVAL] =
3881 jiffies_to_msecs(cnf->rtr_probe_interval);
fa03ef38 3882#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3883 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3884#endif
930d6ff2 3885#endif
fbea49e1 3886 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3887 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3888#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3889 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3890#endif
7bc570c8
YH		 3891#ifdef CONFIG_IPV6_MROUTE
3892 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3893#endif
778d80be 3894 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3895 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3896 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3897}
3898
b382b191
TG		 3899static inline size_t inet6_ifla6_size(void)
3900{
3901 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3902 + nla_total_size(sizeof(struct ifla_cacheinfo))
3903 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3904 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3905 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3906}
3907
339bf98f
TG		 3908static inline size_t inet6_if_nlmsg_size(void)
3909{
3910 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3911 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3912 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3913 + nla_total_size(4) /* IFLA_MTU */
3914 + nla_total_size(4) /* IFLA_LINK */
b382b191 3915 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
339bf98f 3916}
c5396a31 3917
be281e55 3918static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
7d720c3e 3919 int items, int bytes)
7f7d9a6b
HX		 3920{
3921 int i;
3922 int pad = bytes - sizeof(u64) * items;
3923 BUG_ON(pad < 0);
3924
3925 /* Use put_unaligned() because stats may not be aligned for u64. */
3926 put_unaligned(items, &stats[0]);
3927 for (i = 1; i < items; i++)
be281e55 3928 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
7f7d9a6b
HX		 3929
3930 memset(&stats[items], 0, pad);
3931}
3932
4ce3c183
ED		 3933static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3934 int items, int bytes, size_t syncpoff)
3935{
3936 int i;
3937 int pad = bytes - sizeof(u64) * items;
3938 BUG_ON(pad < 0);
3939
3940 /* Use put_unaligned() because stats may not be aligned for u64. */
3941 put_unaligned(items, &stats[0]);
3942 for (i = 1; i < items; i++)
3943 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3944
3945 memset(&stats[items], 0, pad);
3946}
3947
7f7d9a6b
HX		 3948static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3949 int bytes)
3950{
e21e8467 3951 switch (attrtype) {
7f7d9a6b 3952 case IFLA_INET6_STATS:
4ce3c183
ED		 3953 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3954 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
7f7d9a6b
HX		 3955 break;
3956 case IFLA_INET6_ICMP6STATS:
be281e55 3957 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3958 break;
3959 }
3960}
3961
b382b191
TG		 3962static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3963{
3964 struct nlattr *nla;
3965 struct ifla_cacheinfo ci;
3966
c78679e8
DM		 3967 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3968 goto nla_put_failure;
b382b191 3969 ci.max_reasm_len = IPV6_MAXPLEN;
24912420
DM		 3970 ci.tstamp = cstamp_delta(idev->tstamp);
3971 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3972 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
c78679e8
DM		 3973 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3974 goto nla_put_failure;
b382b191
TG		 3975 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3976 if (nla == NULL)
3977 goto nla_put_failure;
3978 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3979
3980 /* XXX - MC not implemented */
3981
3982 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3983 if (nla == NULL)
3984 goto nla_put_failure;
3985 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3986
3987 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3988 if (nla == NULL)
3989 goto nla_put_failure;
3990 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3991
3992 return 0;
3993
3994nla_put_failure:
3995 return -EMSGSIZE;
3996}
3997
3998static size_t inet6_get_link_af_size(const struct net_device *dev)
3999{
4000 if (!__in6_dev_get(dev))
4001 return 0;
4002
4003 return inet6_ifla6_size();
4004}
4005
4006static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4007{
4008 struct inet6_dev *idev = __in6_dev_get(dev);
4009
4010 if (!idev)
4011 return -ENODATA;
4012
4013 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4014 return -EMSGSIZE;
4015
4016 return 0;
4017}
4018
1ab1457c 4019static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4020 u32 portid, u32 seq, int event, unsigned int flags)
1da177e4 4021{
04561c1f 4022 struct net_device *dev = idev->dev;
04561c1f
TG		 4023 struct ifinfomsg *hdr;
4024 struct nlmsghdr *nlh;
4025 void *protoinfo;
04561c1f 4026
15e47304 4027 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
04561c1f 4028 if (nlh == NULL)
26932566 4029 return -EMSGSIZE;
04561c1f
TG		 4030
4031 hdr = nlmsg_data(nlh);
4032 hdr->ifi_family = AF_INET6;
4033 hdr->__ifi_pad = 0;
4034 hdr->ifi_type = dev->type;
4035 hdr->ifi_index = dev->ifindex;
4036 hdr->ifi_flags = dev_get_flags(dev);
4037 hdr->ifi_change = 0;
4038
c78679e8
DM		 4039 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4040 (dev->addr_len &&
4041 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4042 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4043 (dev->ifindex != dev->iflink &&
4044 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4045 goto nla_put_failure;
04561c1f
TG		 4046 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4047 if (protoinfo == NULL)
4048 goto nla_put_failure;
1da177e4 4049
b382b191 4050 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
bf99f1bd 4051 goto nla_put_failure;
1da177e4 4052
04561c1f
TG		 4053 nla_nest_end(skb, protoinfo);
4054 return nlmsg_end(skb, nlh);
1da177e4 4055
04561c1f 4056nla_put_failure:
26932566
PM		 4057 nlmsg_cancel(skb, nlh);
4058 return -EMSGSIZE;
1da177e4
LT		 4059}
4060
4061static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4062{
3b1e0a65 4063 struct net *net = sock_net(skb->sk);
84d2697d 4064 int h, s_h;
434a8a58 4065 int idx = 0, s_idx;
1da177e4
LT		 4066 struct net_device *dev;
4067 struct inet6_dev *idev;
84d2697d
ED		 4068 struct hlist_head *head;
4069 struct hlist_node *node;
1da177e4 4070
84d2697d
ED		 4071 s_h = cb->args[0];
4072 s_idx = cb->args[1];
4073
4074 rcu_read_lock();
4075 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4076 idx = 0;
4077 head = &net->dev_index_head[h];
4078 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4079 if (idx < s_idx)
4080 goto cont;
4081 idev = __in6_dev_get(dev);
4082 if (!idev)
4083 goto cont;
4084 if (inet6_fill_ifinfo(skb, idev,
15e47304 4085 NETLINK_CB(cb->skb).portid,
84d2697d
ED		 4086 cb->nlh->nlmsg_seq,
4087 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4088 goto out;
7562f876 4089cont:
84d2697d
ED		 4090 idx++;
4091 }
1da177e4 4092 }
84d2697d
ED		 4093out:
4094 rcu_read_unlock();
4095 cb->args[1] = idx;
4096 cb->args[0] = h;
1da177e4
LT		 4097
4098 return skb->len;
4099}
4100
4101void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4102{
4103 struct sk_buff *skb;
c346dca1 4104 struct net *net = dev_net(idev->dev);
8d7a76c9 4105 int err = -ENOBUFS;
1ab1457c 4106
339bf98f 4107 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 4108 if (skb == NULL)
4109 goto errout;
4110
4111 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 4112 if (err < 0) {
4113 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4114 WARN_ON(err == -EMSGSIZE);
4115 kfree_skb(skb);
4116 goto errout;
4117 }
5f75a104 4118 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
1ce85fe4 4119 return;
8d7a76c9
TG		 4120errout:
4121 if (err < 0)
5f75a104 4122 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
1da177e4
LT		 4123}
4124
339bf98f
TG		 4125static inline size_t inet6_prefix_nlmsg_size(void)
4126{
4127 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4128 + nla_total_size(sizeof(struct in6_addr))
4129 + nla_total_size(sizeof(struct prefix_cacheinfo));
4130}
c5396a31 4131
1da177e4 4132static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
15e47304 4133 struct prefix_info *pinfo, u32 portid, u32 seq,
6051e2f4 4134 int event, unsigned int flags)
1da177e4 4135{
6051e2f4
TG		 4136 struct prefixmsg *pmsg;
4137 struct nlmsghdr *nlh;
1da177e4
LT		 4138 struct prefix_cacheinfo ci;
4139
15e47304 4140 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6051e2f4 4141 if (nlh == NULL)
26932566 4142 return -EMSGSIZE;
6051e2f4
TG		 4143
4144 pmsg = nlmsg_data(nlh);
1da177e4 4145 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4146 pmsg->prefix_pad1 = 0;
4147 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4148 pmsg->prefix_ifindex = idev->dev->ifindex;
4149 pmsg->prefix_len = pinfo->prefix_len;
4150 pmsg->prefix_type = pinfo->type;
8a47077a 4151 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4152 pmsg->prefix_flags = 0;
4153 if (pinfo->onlink)
4154 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4155 if (pinfo->autoconf)
4156 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4157
c78679e8
DM		 4158 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4159 goto nla_put_failure;
1da177e4
LT		 4160 ci.preferred_time = ntohl(pinfo->prefered);
4161 ci.valid_time = ntohl(pinfo->valid);
c78679e8
DM		 4162 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4163 goto nla_put_failure;
6051e2f4 4164 return nlmsg_end(skb, nlh);
1da177e4 4165
6051e2f4 4166nla_put_failure:
26932566
PM		 4167 nlmsg_cancel(skb, nlh);
4168 return -EMSGSIZE;
1da177e4
LT		 4169}
4170
1ab1457c 4171static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4172 struct prefix_info *pinfo)
4173{
4174 struct sk_buff *skb;
c346dca1 4175 struct net *net = dev_net(idev->dev);
8c384bfa 4176 int err = -ENOBUFS;
1da177e4 4177
339bf98f 4178 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4179 if (skb == NULL)
4180 goto errout;
4181
4182 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4183 if (err < 0) {
4184 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4185 WARN_ON(err == -EMSGSIZE);
4186 kfree_skb(skb);
4187 goto errout;
4188 }
1ce85fe4
PNA		 4189 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4190 return;
8c384bfa
TG		 4191errout:
4192 if (err < 0)
6fda7350 4193 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4194}
4195
1da177e4
LT		 4196static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4197{
4198 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4199
4200 switch (event) {
4201 case RTM_NEWADDR:
95c385b4
NH		 4202 /*
4203 * If the address was optimistic
4204 * we inserted the route at the start of
4205 * our DAD process, so we don't need
4206 * to do it again
4207 */
4208 if (!(ifp->rt->rt6i_node))
4209 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4210 if (ifp->idev->cnf.forwarding)
4211 addrconf_join_anycast(ifp);
4212 break;
4213 case RTM_DELADDR:
4214 if (ifp->idev->cnf.forwarding)
4215 addrconf_leave_anycast(ifp);
4216 addrconf_leave_solict(ifp->idev, &ifp->addr);
d8d1f30b 4217 dst_hold(&ifp->rt->dst);
93fa159a 4218
73a8bd74 4219 if (ip6_del_rt(ifp->rt))
d8d1f30b 4220 dst_free(&ifp->rt->dst);
1da177e4
LT		 4221 break;
4222 }
4223}
4224
4225static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4226{
8814c4b5 4227 rcu_read_lock_bh();
1da177e4
LT		 4228 if (likely(ifp->idev->dead == 0))
4229 __ipv6_ifa_notify(event, ifp);
8814c4b5 4230 rcu_read_unlock_bh();
1da177e4
LT		 4231}
4232
4233#ifdef CONFIG_SYSCTL
4234
4235static
8d65af78 4236int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4237 void __user *buffer, size_t *lenp, loff_t *ppos)
4238{
4239 int *valp = ctl->data;
4240 int val = *valp;
88af182e 4241 loff_t pos = *ppos;
013d97e9 4242 ctl_table lctl;
1da177e4
LT		 4243 int ret;
4244
013d97e9
FR		 4245 /*
4246 * ctl->data points to idev->cnf.forwarding, we should
4247 * not modify it until we get the rtnl lock.
4248 */
4249 lctl = *ctl;
4250 lctl.data = &val;
4251
4252 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
1da177e4 4253
c8fecf22 4254 if (write)
b325fddb 4255 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4256 if (ret)
4257 *ppos = pos;
1ab1457c 4258 return ret;
1da177e4
LT		 4259}
4260
56d417b1
BH		 4261static void dev_disable_change(struct inet6_dev *idev)
4262{
4263 if (!idev || !idev->dev)
4264 return;
4265
4266 if (idev->cnf.disable_ipv6)
4267 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4268 else
4269 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4270}
4271
4272static void addrconf_disable_change(struct net *net, __s32 newf)
4273{
4274 struct net_device *dev;
4275 struct inet6_dev *idev;
4276
c6d14c84
ED		 4277 rcu_read_lock();
4278 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4279 idev = __in6_dev_get(dev);
4280 if (idev) {
4281 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4282 idev->cnf.disable_ipv6 = newf;
4283 if (changed)
4284 dev_disable_change(idev);
4285 }
56d417b1 4286 }
c6d14c84 4287 rcu_read_unlock();
56d417b1
BH		 4288}
4289
013d97e9 4290static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
56d417b1
BH		 4291{
4292 struct net *net;
013d97e9
FR		 4293 int old;
4294
4295 if (!rtnl_trylock())
4296 return restart_syscall();
56d417b1
BH		 4297
4298 net = (struct net *)table->extra2;
013d97e9
FR		 4299 old = *p;
4300 *p = newf;
56d417b1 4301
013d97e9
FR		 4302 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4303 rtnl_unlock();
56d417b1 4304 return 0;
88af182e 4305 }
56d417b1
BH		 4306
4307 if (p == &net->ipv6.devconf_all->disable_ipv6) {
56d417b1
BH		 4308 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4309 addrconf_disable_change(net, newf);
013d97e9 4310 } else if ((!newf) ^ (!old))
56d417b1
BH		 4311 dev_disable_change((struct inet6_dev *)table->extra1);
4312
4313 rtnl_unlock();
4314 return 0;
4315}
4316
4317static
8d65af78 4318int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4319 void __user *buffer, size_t *lenp, loff_t *ppos)
4320{
4321 int *valp = ctl->data;
4322 int val = *valp;
88af182e 4323 loff_t pos = *ppos;
013d97e9 4324 ctl_table lctl;
56d417b1
BH		 4325 int ret;
4326
013d97e9
FR		 4327 /*
4328 * ctl->data points to idev->cnf.disable_ipv6, we should
4329 * not modify it until we get the rtnl lock.
4330 */
4331 lctl = *ctl;
4332 lctl.data = &val;
4333
4334 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
56d417b1
BH		 4335
4336 if (write)
4337 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4338 if (ret)
4339 *ppos = pos;
56d417b1
BH		 4340 return ret;
4341}
4342
1da177e4
LT		 4343static struct addrconf_sysctl_table
4344{
4345 struct ctl_table_header *sysctl_header;
f6a07b29 4346 ctl_table addrconf_vars[DEVCONF_MAX+1];
ab32ea5d 4347} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4348 .sysctl_header = NULL,
4349 .addrconf_vars = {
1ab1457c 4350 {
e21e8467
SH		 4351 .procname = "forwarding",
4352 .data = &ipv6_devconf.forwarding,
4353 .maxlen = sizeof(int),
4354 .mode = 0644,
4355 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4356 },
4357 {
e21e8467
SH		 4358 .procname = "hop_limit",
4359 .data = &ipv6_devconf.hop_limit,
4360 .maxlen = sizeof(int),
4361 .mode = 0644,
4362 .proc_handler = proc_dointvec,
1da177e4
LT		 4363 },
4364 {
e21e8467
SH		 4365 .procname = "mtu",
4366 .data = &ipv6_devconf.mtu6,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
1da177e4
LT		 4370 },
4371 {
e21e8467
SH		 4372 .procname = "accept_ra",
4373 .data = &ipv6_devconf.accept_ra,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec,
1da177e4
LT		 4377 },
4378 {
e21e8467
SH		 4379 .procname = "accept_redirects",
4380 .data = &ipv6_devconf.accept_redirects,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = proc_dointvec,
1da177e4
LT		 4384 },
4385 {
e21e8467
SH		 4386 .procname = "autoconf",
4387 .data = &ipv6_devconf.autoconf,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
1da177e4
LT		 4391 },
4392 {
e21e8467
SH		 4393 .procname = "dad_transmits",
4394 .data = &ipv6_devconf.dad_transmits,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
1da177e4
LT		 4398 },
4399 {
e21e8467
SH		 4400 .procname = "router_solicitations",
4401 .data = &ipv6_devconf.rtr_solicits,
4402 .maxlen = sizeof(int),
4403 .mode = 0644,
4404 .proc_handler = proc_dointvec,
1da177e4
LT		 4405 },
4406 {
e21e8467
SH		 4407 .procname = "router_solicitation_interval",
4408 .data = &ipv6_devconf.rtr_solicit_interval,
4409 .maxlen = sizeof(int),
4410 .mode = 0644,
4411 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4412 },
4413 {
e21e8467
SH		 4414 .procname = "router_solicitation_delay",
4415 .data = &ipv6_devconf.rtr_solicit_delay,
4416 .maxlen = sizeof(int),
4417 .mode = 0644,
4418 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4419 },
4420 {
e21e8467
SH		 4421 .procname = "force_mld_version",
4422 .data = &ipv6_devconf.force_mld_version,
4423 .maxlen = sizeof(int),
4424 .mode = 0644,
4425 .proc_handler = proc_dointvec,
1da177e4
LT		 4426 },
4427#ifdef CONFIG_IPV6_PRIVACY
4428 {
e21e8467
SH		 4429 .procname = "use_tempaddr",
4430 .data = &ipv6_devconf.use_tempaddr,
4431 .maxlen = sizeof(int),
4432 .mode = 0644,
4433 .proc_handler = proc_dointvec,
1da177e4
LT		 4434 },
4435 {
e21e8467
SH		 4436 .procname = "temp_valid_lft",
4437 .data = &ipv6_devconf.temp_valid_lft,
4438 .maxlen = sizeof(int),
4439 .mode = 0644,
4440 .proc_handler = proc_dointvec,
1da177e4
LT		 4441 },
4442 {
e21e8467
SH		 4443 .procname = "temp_prefered_lft",
4444 .data = &ipv6_devconf.temp_prefered_lft,
4445 .maxlen = sizeof(int),
4446 .mode = 0644,
4447 .proc_handler = proc_dointvec,
1da177e4
LT		 4448 },
4449 {
e21e8467
SH		 4450 .procname = "regen_max_retry",
4451 .data = &ipv6_devconf.regen_max_retry,
4452 .maxlen = sizeof(int),
4453 .mode = 0644,
4454 .proc_handler = proc_dointvec,
1da177e4
LT		 4455 },
4456 {
e21e8467
SH		 4457 .procname = "max_desync_factor",
4458 .data = &ipv6_devconf.max_desync_factor,
4459 .maxlen = sizeof(int),
4460 .mode = 0644,
4461 .proc_handler = proc_dointvec,
1da177e4
LT		 4462 },
4463#endif
4464 {
e21e8467
SH		 4465 .procname = "max_addresses",
4466 .data = &ipv6_devconf.max_addresses,
4467 .maxlen = sizeof(int),
4468 .mode = 0644,
4469 .proc_handler = proc_dointvec,
1da177e4 4470 },
65f5c7c1 4471 {
e21e8467
SH		 4472 .procname = "accept_ra_defrtr",
4473 .data = &ipv6_devconf.accept_ra_defrtr,
4474 .maxlen = sizeof(int),
4475 .mode = 0644,
4476 .proc_handler = proc_dointvec,
65f5c7c1 4477 },
c4fd30eb 4478 {
e21e8467
SH		 4479 .procname = "accept_ra_pinfo",
4480 .data = &ipv6_devconf.accept_ra_pinfo,
4481 .maxlen = sizeof(int),
4482 .mode = 0644,
4483 .proc_handler = proc_dointvec,
c4fd30eb 4484 },
930d6ff2
YH		 4485#ifdef CONFIG_IPV6_ROUTER_PREF
4486 {
e21e8467
SH		 4487 .procname = "accept_ra_rtr_pref",
4488 .data = &ipv6_devconf.accept_ra_rtr_pref,
4489 .maxlen = sizeof(int),
4490 .mode = 0644,
4491 .proc_handler = proc_dointvec,
930d6ff2 4492 },
52e16356 4493 {
e21e8467
SH		 4494 .procname = "router_probe_interval",
4495 .data = &ipv6_devconf.rtr_probe_interval,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec_jiffies,
52e16356 4499 },
fa03ef38 4500#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4501 {
e21e8467
SH		 4502 .procname = "accept_ra_rt_info_max_plen",
4503 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4504 .maxlen = sizeof(int),
4505 .mode = 0644,
4506 .proc_handler = proc_dointvec,
09c884d4
YH		 4507 },
4508#endif
930d6ff2 4509#endif
fbea49e1 4510 {
e21e8467
SH		 4511 .procname = "proxy_ndp",
4512 .data = &ipv6_devconf.proxy_ndp,
4513 .maxlen = sizeof(int),
4514 .mode = 0644,
4515 .proc_handler = proc_dointvec,
fbea49e1 4516 },
0bcbc926 4517 {
e21e8467
SH		 4518 .procname = "accept_source_route",
4519 .data = &ipv6_devconf.accept_source_route,
4520 .maxlen = sizeof(int),
4521 .mode = 0644,
4522 .proc_handler = proc_dointvec,
0bcbc926 4523 },
95c385b4
NH		 4524#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4525 {
e21e8467
SH		 4526 .procname = "optimistic_dad",
4527 .data = &ipv6_devconf.optimistic_dad,
4528 .maxlen = sizeof(int),
4529 .mode = 0644,
4530 .proc_handler = proc_dointvec,
95c385b4
NH		 4531
4532 },
7bc570c8
YH		 4533#endif
4534#ifdef CONFIG_IPV6_MROUTE
4535 {
e21e8467
SH		 4536 .procname = "mc_forwarding",
4537 .data = &ipv6_devconf.mc_forwarding,
4538 .maxlen = sizeof(int),
4539 .mode = 0444,
4540 .proc_handler = proc_dointvec,
7bc570c8 4541 },
95c385b4 4542#endif
778d80be 4543 {
e21e8467
SH		 4544 .procname = "disable_ipv6",
4545 .data = &ipv6_devconf.disable_ipv6,
4546 .maxlen = sizeof(int),
4547 .mode = 0644,
4548 .proc_handler = addrconf_sysctl_disable,
778d80be 4549 },
1b34be74 4550 {
e21e8467
SH		 4551 .procname = "accept_dad",
4552 .data = &ipv6_devconf.accept_dad,
4553 .maxlen = sizeof(int),
4554 .mode = 0644,
4555 .proc_handler = proc_dointvec,
1b34be74 4556 },
f7734fdf 4557 {
f7734fdf
OP		 4558 .procname = "force_tllao",
4559 .data = &ipv6_devconf.force_tllao,
4560 .maxlen = sizeof(int),
4561 .mode = 0644,
4562 .proc_handler = proc_dointvec
4563 },
1da177e4 4564 {
f8572d8f 4565 /* sentinel */
1da177e4
LT		 4566 }
4567 },
1da177e4
LT		 4568};
4569
bff16c2f 4570static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4571 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4572{
4573 int i;
1da177e4 4574 struct addrconf_sysctl_table *t;
6105e293 4575 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
1dab6222 4576
af879cc7 4577 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4578 if (t == NULL)
f68635e6
PE		 4579 goto out;
4580
bcdd553f 4581 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4582 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4583 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4584 t->addrconf_vars[i].extra2 = net;
1da177e4 4585 }
1da177e4 4586
6105e293 4587 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
1da177e4 4588
6105e293 4589 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
1da177e4 4590 if (t->sysctl_header == NULL)
6105e293 4591 goto free;
f68635e6
PE		 4592
4593 p->sysctl = t;
95897312 4594 return 0;
1da177e4 4595
f68635e6 4596free:
1da177e4 4597 kfree(t);
f68635e6 4598out:
95897312 4599 return -ENOBUFS;
1da177e4
LT		 4600}
4601
408c4768
PE		 4602static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4603{
4604 struct addrconf_sysctl_table *t;
4605
4606 if (p->sysctl == NULL)
4607 return;
4608
4609 t = p->sysctl;
4610 p->sysctl = NULL;
ff538818 4611 unregister_net_sysctl_table(t->sysctl_header);
408c4768
PE		 4612 kfree(t);
4613}
4614
f52295a9
PE		 4615static void addrconf_sysctl_register(struct inet6_dev *idev)
4616{
54716e3b 4617 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4618 &ndisc_ifinfo_sysctl_change);
c346dca1 4619 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4620 idev, &idev->cnf);
f52295a9
PE		 4621}
4622
408c4768 4623static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4624{
408c4768
PE		 4625 __addrconf_sysctl_unregister(&idev->cnf);
4626 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4627}
4628
4629
4630#endif
4631
2c8c1e72 4632static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4633{
4634 int err;
4635 struct ipv6_devconf *all, *dflt;
4636
4637 err = -ENOMEM;
4638 all = &ipv6_devconf;
4639 dflt = &ipv6_devconf_dflt;
4640
09ad9bc7 4641 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4642 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4643 if (all == NULL)
4644 goto err_alloc_all;
4645
4646 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4647 if (dflt == NULL)
4648 goto err_alloc_dflt;
56d417b1
BH		 4649 } else {
4650 /* these will be inherited by all namespaces */
4651 dflt->autoconf = ipv6_defaults.autoconf;
4652 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4653 }
4654
4655 net->ipv6.devconf_all = all;
4656 net->ipv6.devconf_dflt = dflt;
4657
4658#ifdef CONFIG_SYSCTL
f8572d8f 4659 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4660 if (err < 0)
4661 goto err_reg_all;
4662
f8572d8f 4663 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4664 if (err < 0)
4665 goto err_reg_dflt;
4666#endif
4667 return 0;
4668
4669#ifdef CONFIG_SYSCTL
4670err_reg_dflt:
4671 __addrconf_sysctl_unregister(all);
4672err_reg_all:
4673 kfree(dflt);
4674#endif
4675err_alloc_dflt:
4676 kfree(all);
4677err_alloc_all:
4678 return err;
4679}
4680
2c8c1e72 4681static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4682{
4683#ifdef CONFIG_SYSCTL
4684 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4685 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4686#endif
09ad9bc7 4687 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4688 kfree(net->ipv6.devconf_dflt);
4689 kfree(net->ipv6.devconf_all);
4690 }
4691}
4692
4693static struct pernet_operations addrconf_ops = {
4694 .init = addrconf_init_net,
4695 .exit = addrconf_exit_net,
4696};
4697
1da177e4
LT		 4698/*
4699 * Device notifier
4700 */
4701
4702int register_inet6addr_notifier(struct notifier_block *nb)
4703{
1ab1457c 4704 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4705}
7159039a
YH		 4706EXPORT_SYMBOL(register_inet6addr_notifier);
4707
1da177e4
LT		 4708int unregister_inet6addr_notifier(struct notifier_block *nb)
4709{
e21e8467 4710 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4711}
7159039a
YH		 4712EXPORT_SYMBOL(unregister_inet6addr_notifier);
4713
b382b191
TG		 4714static struct rtnl_af_ops inet6_ops = {
4715 .family = AF_INET6,
4716 .fill_link_af = inet6_fill_link_af,
4717 .get_link_af_size = inet6_get_link_af_size,
b382b191
TG		 4718};
4719
1da177e4
LT		 4720/*
4721 * Init / cleanup code
4722 */
4723
4724int __init addrconf_init(void)
4725{
c2e21293 4726 int i, err;
2a8cc6c8 4727
e21e8467
SH		 4728 err = ipv6_addr_label_init();
4729 if (err < 0) {
f3213831
JP		 4730 pr_crit("%s: cannot initialize default policy table: %d\n",
4731 __func__, err);
2cc6d2bf 4732 goto out;
2a8cc6c8 4733 }
1da177e4 4734
2cc6d2bf
NH		 4735 err = register_pernet_subsys(&addrconf_ops);
4736 if (err < 0)
4737 goto out_addrlabel;
e0da5a48 4738
1da177e4
LT		 4739 /* The addrconf netdev notifier requires that loopback_dev
4740 * has it's ipv6 private information allocated and setup
4741 * before it can bring up and give link-local addresses
4742 * to other devices which are up.
4743 *
4744 * Unfortunately, loopback_dev is not necessarily the first
4745 * entry in the global dev_base list of net devices. In fact,
4746 * it is likely to be the very last entry on that list.
4747 * So this causes the notifier registry below to try and
4748 * give link-local addresses to all devices besides loopback_dev
4749 * first, then loopback_dev, which cases all the non-loopback_dev
4750 * devices to fail to get a link-local address.
4751 *
4752 * So, as a temporary fix, allocate the ipv6 structure for
4753 * loopback_dev first by hand.
4754 * Longer term, all of the dependencies ipv6 has upon the loopback
4755 * device and it being up should be removed.
4756 */
4757 rtnl_lock();
2774c7ab 4758 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4759 err = -ENOMEM;
4760 rtnl_unlock();
4761 if (err)
e0da5a48 4762 goto errlo;
1da177e4 4763
c2e21293 4764 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4765 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4766
1da177e4
LT		 4767 register_netdevice_notifier(&ipv6_dev_notf);
4768
1da177e4 4769 addrconf_verify(0);
c127ea2c 4770
b382b191
TG		 4771 err = rtnl_af_register(&inet6_ops);
4772 if (err < 0)
4773 goto errout_af;
4774
c7ac8679
GR		 4775 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4776 NULL);
c127ea2c
TG		 4777 if (err < 0)
4778 goto errout;
4779
4780 /* Only the first call to __rtnl_register can fail */
c7ac8679
GR		 4781 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4782 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4783 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4784 inet6_dump_ifaddr, NULL);
4785 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4786 inet6_dump_ifmcaddr, NULL);
4787 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4788 inet6_dump_ifacaddr, NULL);
c127ea2c 4789
2a8cc6c8
YH		 4790 ipv6_addr_label_rtnl_register();
4791
1da177e4 4792 return 0;
c127ea2c 4793errout:
b382b191
TG		 4794 rtnl_af_unregister(&inet6_ops);
4795errout_af:
c127ea2c 4796 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4797errlo:
4798 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf
NH		 4799out_addrlabel:
4800 ipv6_addr_label_cleanup();
4801out:
c127ea2c 4802 return err;
1da177e4
LT		 4803}
4804
09f7709f 4805void addrconf_cleanup(void)
1da177e4 4806{
176c39af 4807 struct net_device *dev;
1da177e4
LT		 4808 int i;
4809
4810 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4811 unregister_pernet_subsys(&addrconf_ops);
2cc6d2bf 4812 ipv6_addr_label_cleanup();
1da177e4
LT		 4813
4814 rtnl_lock();
4815
b382b191
TG		 4816 __rtnl_af_unregister(&inet6_ops);
4817
176c39af
DL		 4818 /* clean dev list */
4819 for_each_netdev(&init_net, dev) {
4820 if (__in6_dev_get(dev) == NULL)
4821 continue;
4822 addrconf_ifdown(dev, 1);
4823 }
4824 addrconf_ifdown(init_net.loopback_dev, 2);
4825
1da177e4
LT		 4826 /*
4827 * Check hash table.
4828 */
5c578aed 4829 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4830 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4831 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4832 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4833
4834 del_timer(&addr_chk_timer);
1da177e4 4835 rtnl_unlock();
1da177e4 4836}
Linux kernel - Deliverables
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