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Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/linville...
[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 <[email protected]>
1da177e4
LT		 7 * Alexey Kuznetsov <[email protected]>
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 * <[email protected]>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
e21e8467 101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 102
b2db7564
YH		 103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
1da177e4 107#ifdef CONFIG_SYSCTL
f52295a9 108static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
1da177e4
LT		 118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 126#endif
127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
1da177e4
LT		 137static void addrconf_verify(unsigned long);
138
8d06afab 139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
93d9b7d7
JP		 145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
1da177e4
LT		 147static int addrconf_ifdown(struct net_device *dev, int how);
148
e431b8c0 149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 152static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
1ab1457c 157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 158 struct prefix_info *pinfo);
3e81c6da
DM		 159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
1da177e4 161
e041c683 162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 163
888c848e 164static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 184 .accept_ra_defrtr = 1,
c4fd30eb 185 .accept_ra_pinfo = 1,
930d6ff2
YH		 186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
52e16356 188 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
930d6ff2 192#endif
fbea49e1 193 .proxy_ndp = 0,
0bcbc926 194 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 195 .disable_ipv6 = 0,
1b34be74 196 .accept_dad = 1,
1da177e4
LT		 197};
198
ab32ea5d 199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
c4fd30eb 219 .accept_ra_pinfo = 1,
930d6ff2
YH		 220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
52e16356 222 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
930d6ff2 226#endif
fbea49e1 227 .proxy_ndp = 0,
0bcbc926 228 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 229 .disable_ipv6 = 0,
1b34be74 230 .accept_dad = 1,
1da177e4
LT		 231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 238
f24e3d65 239/* Check if a valid qdisc is available */
05297949 240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 241{
05297949 242 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 243}
244
2b5ead46
YH		 245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
1da177e4
LT		 251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
e21e8467 257enum addrconf_timer_t {
1da177e4
LT		 258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
e21e8467
SH		 277 default:
278 break;
1da177e4
LT		 279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 287 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 288 goto err_ip;
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 290 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 291 goto err_icmp;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 293 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 294 goto err_icmpmsg;
7f7d9a6b
HX		 295
296 return 0;
297
14878f75 298err_icmpmsg:
7d720c3e 299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 300err_icmp:
7d720c3e 301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 302err_ip:
aaf70ec7 303 return -ENOMEM;
7f7d9a6b
HX		 304}
305
16910b98 306static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 307{
7d720c3e
TH		 308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 311}
312
1da177e4
LT		 313/* Nobody refers to this device, we may destroy it. */
314
8814c4b5
YH		 315static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316{
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319}
320
1da177e4
LT		 321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4
LT		 328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
e21e8467 333 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
8814c4b5 337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 338}
339
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
1da177e4
LT		 342static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
b077d7ab
YH		 401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
1da177e4
LT		 426#endif
427
f24e3d65 428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 429 ndev->if_flags |= IF_READY;
430
322f74a4
IO		 431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
f52295a9 433 addrconf_sysctl_register(ndev);
30c4cf57
DS		 434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 436
437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
1da177e4
LT		 440 return ndev;
441}
442
cee89473 443static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
e21e8467
SH		 449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
1da177e4
LT		 453 return NULL;
454 }
c5e33bdd 455
1da177e4
LT		 456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
1da177e4
LT		 466
467 if (!idev)
468 return;
469 dev = idev->dev;
0187bdfb
BH		 470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
1da177e4 472 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 473 if (idev->cnf.forwarding)
f3ee4010 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 475 else
f3ee4010 476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 477 }
502a2ffd 478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
1da177e4
LT		 482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
e186932b 490static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
c6d14c84
ED		 495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 497 idev = __in6_dev_get(dev);
498 if (idev) {
e186932b
PE		 499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
1da177e4
LT		 501 if (changed)
502 dev_forward_change(idev);
503 }
1da177e4 504 }
c6d14c84 505 rcu_read_unlock();
1da177e4 506}
c8fecf22 507
b325fddb 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 509{
bff16c2f
PE		 510 struct net *net;
511
512 net = (struct net *)table->extra2;
441fc2a2 513 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 514 return 0;
515
88af182e
EB		 516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
5007392d 519 return restart_syscall();
88af182e 520 }
c8fecf22 521
e186932b
PE		 522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
c8fecf22
PE		 526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 528 rtnl_unlock();
c8fecf22
PE		 529
530 if (*p)
7b4da532 531 rt6_purge_dflt_routers(net);
b325fddb 532 return 1;
c8fecf22 533}
1da177e4
LT		 534#endif
535
5c578aed 536static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537{
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540}
1da177e4 541
5c578aed 542/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 543void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544{
c2e21293 545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 546
1da177e4
LT		 547#ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549#endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
e21e8467 554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4
LT		 555
556 if (!ifp->dead) {
e21e8467 557 pr_warning("Freeing alive inet6 address %p\n", ifp);
1da177e4
LT		 558 return;
559 }
560 dst_release(&ifp->rt->u.dst);
561
5c578aed 562 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
1da177e4
LT		 563}
564
e55ffac6
BH		 565static void
566ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
567{
502a2ffd 568 struct list_head *p;
8a6ce0c0 569 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 570
571 /*
572 * Each device address list is sorted in order of scope -
573 * global before linklocal.
574 */
502a2ffd 575 list_for_each(p, &idev->addr_list) {
576 struct inet6_ifaddr *ifa
577 = list_entry(p, struct inet6_ifaddr, if_list);
8a6ce0c0 578 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 579 break;
580 }
581
b54c9b98 582 list_add_tail(&ifp->if_list, p);
e55ffac6
BH		 583}
584
3a88a81d 585static u32 ipv6_addr_hash(const struct in6_addr *addr)
3eb84f49 586{
3eb84f49
YH		 587 /*
588 * We perform the hash function over the last 64 bits of the address
589 * This will include the IEEE address token on links that support it.
590 */
0eae88f3
ED		 591 return jhash_2words((__force u32)addr->s6_addr32[2],
592 (__force u32)addr->s6_addr32[3], 0)
3a88a81d 593 & (IN6_ADDR_HSIZE - 1);
3eb84f49
YH		 594}
595
1da177e4
LT		 596/* On success it returns ifp with increased reference count */
597
598static struct inet6_ifaddr *
599ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 600 int scope, u32 flags)
1da177e4
LT		 601{
602 struct inet6_ifaddr *ifa = NULL;
603 struct rt6_info *rt;
3a88a81d 604 unsigned int hash;
1da177e4 605 int err = 0;
d68b8270
YH		 606 int addr_type = ipv6_addr_type(addr);
607
608 if (addr_type == IPV6_ADDR_ANY ||
609 addr_type & IPV6_ADDR_MULTICAST ||
610 (!(idev->dev->flags & IFF_LOOPBACK) &&
611 addr_type & IPV6_ADDR_LOOPBACK))
612 return ERR_PTR(-EADDRNOTAVAIL);
1da177e4 613
8814c4b5 614 rcu_read_lock_bh();
1da177e4
LT		 615 if (idev->dead) {
616 err = -ENODEV; /*XXX*/
617 goto out2;
618 }
619
56d417b1 620 if (idev->cnf.disable_ipv6) {
9bdd8d40
BH		 621 err = -EACCES;
622 goto out2;
623 }
624
5c578aed 625 spin_lock(&addrconf_hash_lock);
1da177e4
LT		 626
627 /* Ignore adding duplicate addresses on an interface */
c346dca1 628 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1da177e4
LT		 629 ADBG(("ipv6_add_addr: already assigned\n"));
630 err = -EEXIST;
631 goto out;
632 }
633
322f74a4 634 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 635
636 if (ifa == NULL) {
637 ADBG(("ipv6_add_addr: malloc failed\n"));
638 err = -ENOBUFS;
639 goto out;
640 }
641
642 rt = addrconf_dst_alloc(idev, addr, 0);
643 if (IS_ERR(rt)) {
644 err = PTR_ERR(rt);
645 goto out;
646 }
647
1da177e4
LT		 648 ipv6_addr_copy(&ifa->addr, addr);
649
650 spin_lock_init(&ifa->lock);
651 init_timer(&ifa->timer);
c2e21293 652 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 653 ifa->timer.data = (unsigned long) ifa;
654 ifa->scope = scope;
655 ifa->prefix_len = pfxlen;
656 ifa->flags = flags | IFA_F_TENTATIVE;
657 ifa->cstamp = ifa->tstamp = jiffies;
658
57f5f544
KF		 659 ifa->rt = rt;
660
95c385b4
NH		 661 /*
662 * part one of RFC 4429, section 3.3
663 * We should not configure an address as
664 * optimistic if we do not yet know the link
665 * layer address of our nexhop router
666 */
667
668 if (rt->rt6i_nexthop == NULL)
669 ifa->flags &= ~IFA_F_OPTIMISTIC;
670
1da177e4
LT		 671 ifa->idev = idev;
672 in6_dev_hold(idev);
673 /* For caller */
674 in6_ifa_hold(ifa);
675
676 /* Add to big hash table */
677 hash = ipv6_addr_hash(addr);
678
5c578aed 679 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 680 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 681
682 write_lock(&idev->lock);
683 /* Add to inet6_dev unicast addr list. */
e55ffac6 684 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 685
686#ifdef CONFIG_IPV6_PRIVACY
687 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 688 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 689 in6_ifa_hold(ifa);
690 }
691#endif
692
1da177e4
LT		 693 in6_ifa_hold(ifa);
694 write_unlock(&idev->lock);
695out2:
8814c4b5 696 rcu_read_unlock_bh();
1da177e4 697
fd92833a 698 if (likely(err == 0))
e041c683 699 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 700 else {
701 kfree(ifa);
702 ifa = ERR_PTR(err);
703 }
704
705 return ifa;
706out:
5c578aed 707 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 708 goto out2;
709}
710
711/* This function wants to get referenced ifp and releases it before return */
712
713static void ipv6_del_addr(struct inet6_ifaddr *ifp)
714{
502a2ffd 715 struct inet6_ifaddr *ifa, *ifn;
1da177e4
LT		 716 struct inet6_dev *idev = ifp->idev;
717 int hash;
718 int deleted = 0, onlink = 0;
719 unsigned long expires = jiffies;
720
721 hash = ipv6_addr_hash(&ifp->addr);
722
723 ifp->dead = 1;
724
5c578aed 725 spin_lock_bh(&addrconf_hash_lock);
726 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 727 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 728
729 write_lock_bh(&idev->lock);
730#ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 732 list_del(&ifp->tmp_list);
733 if (ifp->ifpub) {
734 in6_ifa_put(ifp->ifpub);
735 ifp->ifpub = NULL;
1da177e4 736 }
372e6c8f 737 __in6_ifa_put(ifp);
1da177e4
LT		 738 }
739#endif
740
502a2ffd 741 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 742 if (ifa == ifp) {
502a2ffd 743 list_del_init(&ifp->if_list);
1da177e4 744 __in6_ifa_put(ifp);
502a2ffd 745
1da177e4
LT		 746 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
747 break;
748 deleted = 1;
1d142804 749 continue;
1da177e4
LT		 750 } else if (ifp->flags & IFA_F_PERMANENT) {
751 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
752 ifp->prefix_len)) {
753 if (ifa->flags & IFA_F_PERMANENT) {
754 onlink = 1;
755 if (deleted)
756 break;
757 } else {
758 unsigned long lifetime;
759
760 if (!onlink)
761 onlink = -1;
762
763 spin_lock(&ifa->lock);
4bed72e4
YH		 764
765 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
766 /*
767 * Note: Because this address is
768 * not permanent, lifetime <
769 * LONG_MAX / HZ here.
770 */
1da177e4
LT		 771 if (time_before(expires,
772 ifa->tstamp + lifetime * HZ))
773 expires = ifa->tstamp + lifetime * HZ;
774 spin_unlock(&ifa->lock);
775 }
776 }
777 }
778 }
779 write_unlock_bh(&idev->lock);
780
b2238566
AV		 781 addrconf_del_timer(ifp);
782
1da177e4
LT		 783 ipv6_ifa_notify(RTM_DELADDR, ifp);
784
e041c683 785 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 786
1da177e4
LT		 787 /*
788 * Purge or update corresponding prefix
789 *
790 * 1) we don't purge prefix here if address was not permanent.
791 * prefix is managed by its own lifetime.
792 * 2) if there're no addresses, delete prefix.
793 * 3) if there're still other permanent address(es),
794 * corresponding prefix is still permanent.
795 * 4) otherwise, update prefix lifetime to the
796 * longest valid lifetime among the corresponding
797 * addresses on the device.
798 * Note: subsequent RA will update lifetime.
799 *
800 * --yoshfuji
801 */
802 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
803 struct in6_addr prefix;
804 struct rt6_info *rt;
c346dca1 805 struct net *net = dev_net(ifp->idev->dev);
1da177e4 806 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 807 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 808
2b5ead46 809 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 810 if (onlink == 0) {
e0a1ad73 811 ip6_del_rt(rt);
1da177e4
LT		 812 rt = NULL;
813 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
814 rt->rt6i_expires = expires;
815 rt->rt6i_flags |= RTF_EXPIRES;
816 }
817 }
818 dst_release(&rt->u.dst);
819 }
820
821 in6_ifa_put(ifp);
822}
823
824#ifdef CONFIG_IPV6_PRIVACY
825static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
826{
827 struct inet6_dev *idev = ifp->idev;
828 struct in6_addr addr, *tmpaddr;
829 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 830 unsigned long regen_advance;
1da177e4
LT		 831 int tmp_plen;
832 int ret = 0;
833 int max_addresses;
95c385b4 834 u32 addr_flags;
1da177e4
LT		 835
836 write_lock(&idev->lock);
837 if (ift) {
838 spin_lock_bh(&ift->lock);
839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
840 spin_unlock_bh(&ift->lock);
841 tmpaddr = &addr;
842 } else {
843 tmpaddr = NULL;
844 }
845retry:
846 in6_dev_hold(idev);
847 if (idev->cnf.use_tempaddr <= 0) {
848 write_unlock(&idev->lock);
849 printk(KERN_INFO
850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
851 in6_dev_put(idev);
852 ret = -1;
853 goto out;
854 }
855 spin_lock_bh(&ifp->lock);
856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
857 idev->cnf.use_tempaddr = -1; /*XXX*/
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
860 printk(KERN_WARNING
861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
862 in6_dev_put(idev);
863 ret = -1;
864 goto out;
865 }
866 in6_ifa_hold(ifp);
867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
871 printk(KERN_WARNING
872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
873 in6_ifa_put(ifp);
874 in6_dev_put(idev);
875 ret = -1;
876 goto out;
877 }
878 memcpy(&addr.s6_addr[8], idev->rndid, 8);
879 tmp_valid_lft = min_t(__u32,
880 ifp->valid_lft,
881 idev->cnf.temp_valid_lft);
1ab1457c
YH		 882 tmp_prefered_lft = min_t(__u32,
883 ifp->prefered_lft,
1da177e4
LT		 884 idev->cnf.temp_prefered_lft - desync_factor / HZ);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
eac55bf9
BB		 891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
1da177e4 894 write_unlock(&idev->lock);
95c385b4 895
eac55bf9
BB		 896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
95c385b4
NH		 908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
1da177e4 913 ift = !max_addresses ||
1ab1457c 914 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 915 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
1da177e4
LT		 918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939out:
940 return ret;
941}
942#endif
943
944/*
072047e4 945 * Choose an appropriate source address (RFC3484)
1da177e4 946 */
a9b05723
YH		 947enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952#ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954#endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957#ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959#endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963};
964
072047e4 965struct ipv6_saddr_score {
a9b05723
YH		 966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
072047e4
YH		 972};
973
a9b05723 974struct ipv6_saddr_dst {
9acd9f3a 975 const struct in6_addr *addr;
a9b05723
YH		 976 int ifindex;
977 int scope;
978 int label;
7cbca67c 979 unsigned int prefs;
a9b05723 980};
072047e4 981
b6f99a21 982static inline int ipv6_saddr_preferred(int type)
1da177e4 983{
45bb0060 984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 985 return 1;
986 return 0;
1da177e4
LT		 987}
988
3de23255
BT		 989static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
a9b05723
YH		 991 struct ipv6_saddr_dst *dst,
992 int i)
993{
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053#ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
7cbca67c 1055 {
a9b05723 1056 /* Rule 4: Prefer home address */
7cbca67c
YH		 1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1059 break;
7cbca67c 1060 }
a9b05723
YH		 1061#endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
3de23255
BT		 1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073#ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1075 {
a9b05723
YH		 1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1078 */
7cbca67c
YH		 1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1083 break;
7cbca67c 1084 }
a9b05723
YH		 1085#endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105out:
1106 return ret;
1107}
1108
191cd582 1109int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1110 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1111 struct in6_addr *saddr)
1da177e4 1112{
a9b05723
YH		 1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1115 struct ipv6_saddr_dst dst;
072047e4 1116 struct net_device *dev;
a9b05723 1117 int dst_type;
1da177e4 1118
a9b05723
YH		 1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1124 dst.prefs = prefs;
a9b05723
YH		 1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1da177e4 1128
8814c4b5 1129 rcu_read_lock();
1da177e4 1130
c6d14c84 1131 for_each_netdev_rcu(net, dev) {
072047e4 1132 struct inet6_dev *idev;
072047e4 1133
a9b05723 1134 /* Candidate Source Address (section 4)
072047e4
YH		 1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
a9b05723
YH		 1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1149 continue;
1da177e4 1150
1da177e4 1151 idev = __in6_dev_get(dev);
072047e4
YH		 1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
502a2ffd 1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1157 int i;
072047e4 1158
a9b05723 1159 /*
6b3ae80a
YH		 1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
95c385b4 1163 * sense, unless it is also flagged as optimistic.
6b3ae80a 1164 * - Candidate Source Address (section 4)
072047e4
YH		 1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
a9b05723
YH		 1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1171 continue;
a9b05723
YH		 1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1177 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1178 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
a9b05723
YH		 1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
3de23255
BT		 1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
a9b05723
YH		 1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
a0bffffc 1213 swap(hiscore, score);
a9b05723
YH		 1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1da177e4 1219 }
072047e4 1220 }
1da177e4 1221 }
a9b05723 1222try_nextdev:
072047e4 1223 read_unlock_bh(&idev->lock);
1da177e4 1224 }
8814c4b5 1225 rcu_read_unlock();
1da177e4 1226
a9b05723 1227 if (!hiscore->ifa)
072047e4 1228 return -EADDRNOTAVAIL;
1ab1457c 1229
a9b05723
YH		 1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
072047e4 1232 return 0;
1da177e4 1233}
5e5f3f0f 1234EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1235
95c385b4
NH		 1236int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1da177e4
LT		 1238{
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
8814c4b5 1242 rcu_read_lock();
e21e8467
SH		 1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1da177e4
LT		 1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
502a2ffd 1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
8814c4b5 1258 rcu_read_unlock();
1da177e4
LT		 1259 return err;
1260}
1261
1262static int ipv6_count_addresses(struct inet6_dev *idev)
1263{
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
502a2ffd 1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272}
1273
bfeade08
DL		 1274int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1da177e4 1276{
c2e21293 1277 struct inet6_ifaddr *ifp = NULL;
1278 struct hlist_node *node;
3a88a81d 1279 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1280
5c578aed 1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1283 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1284 continue;
1da177e4
LT		 1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE)) {
1287 if (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1289 break;
1290 }
1291 }
5c578aed 1292 rcu_read_unlock_bh();
1293
1da177e4
LT		 1294 return ifp != NULL;
1295}
7159039a
YH		 1296EXPORT_SYMBOL(ipv6_chk_addr);
1297
3e81c6da
DM		 1298static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1299 struct net_device *dev)
1da177e4 1300{
3e81c6da 1301 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1302 struct inet6_ifaddr *ifp;
1303 struct hlist_node *node;
1da177e4 1304
c2e21293 1305 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1306 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1307 continue;
1da177e4
LT		 1308 if (ipv6_addr_equal(&ifp->addr, addr)) {
1309 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1310 return true;
1da177e4
LT		 1311 }
1312 }
3e81c6da 1313 return false;
1da177e4
LT		 1314}
1315
52eeeb84
YH		 1316int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1317{
1318 struct inet6_dev *idev;
1319 struct inet6_ifaddr *ifa;
1320 int onlink;
1321
1322 onlink = 0;
1323 rcu_read_lock();
1324 idev = __in6_dev_get(dev);
1325 if (idev) {
1326 read_lock_bh(&idev->lock);
502a2ffd 1327 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1328 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1329 ifa->prefix_len);
1330 if (onlink)
1331 break;
1332 }
1333 read_unlock_bh(&idev->lock);
1334 }
1335 rcu_read_unlock();
1336 return onlink;
1337}
1338
1339EXPORT_SYMBOL(ipv6_chk_prefix);
1340
9acd9f3a 1341struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1342 struct net_device *dev, int strict)
1da177e4 1343{
b79d1d54 1344 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1345 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1346 struct hlist_node *node;
1da177e4 1347
5c578aed 1348 rcu_read_lock_bh();
4f70ecca 1349 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1350 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1351 continue;
1da177e4
LT		 1352 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353 if (dev == NULL || ifp->idev->dev == dev ||
1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1355 result = ifp;
1da177e4
LT		 1356 in6_ifa_hold(ifp);
1357 break;
1358 }
1359 }
1360 }
5c578aed 1361 rcu_read_unlock_bh();
1da177e4 1362
b79d1d54 1363 return result;
1da177e4
LT		 1364}
1365
1da177e4
LT		 1366/* Gets referenced address, destroys ifaddr */
1367
cc411d0b 1368static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1369{
1da177e4
LT		 1370 if (ifp->flags&IFA_F_PERMANENT) {
1371 spin_lock_bh(&ifp->lock);
1372 addrconf_del_timer(ifp);
1373 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1374 if (dad_failed)
1375 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1376 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1377 if (dad_failed)
1378 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1379 in6_ifa_put(ifp);
1380#ifdef CONFIG_IPV6_PRIVACY
1381 } else if (ifp->flags&IFA_F_TEMPORARY) {
1382 struct inet6_ifaddr *ifpub;
1383 spin_lock_bh(&ifp->lock);
1384 ifpub = ifp->ifpub;
1385 if (ifpub) {
1386 in6_ifa_hold(ifpub);
1387 spin_unlock_bh(&ifp->lock);
1388 ipv6_create_tempaddr(ifpub, ifp);
1389 in6_ifa_put(ifpub);
1390 } else {
1391 spin_unlock_bh(&ifp->lock);
1392 }
1393 ipv6_del_addr(ifp);
1394#endif
1395 } else
1396 ipv6_del_addr(ifp);
1397}
1398
3c21edbd
YH		 1399void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1400{
1b34be74 1401 struct inet6_dev *idev = ifp->idev;
9bdd8d40
BH		 1402
1403 if (net_ratelimit())
0522fea6
JR		 1404 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1405 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1406
1b34be74
YH		 1407 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1408 struct in6_addr addr;
1409
1410 addr.s6_addr32[0] = htonl(0xfe800000);
1411 addr.s6_addr32[1] = 0;
1412
1413 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1414 ipv6_addr_equal(&ifp->addr, &addr)) {
1415 /* DAD failed for link-local based on MAC address */
1416 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1417
1418 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1419 ifp->idev->dev->name);
1b34be74
YH		 1420 }
1421 }
1422
cc411d0b 1423 addrconf_dad_stop(ifp, 1);
3c21edbd 1424}
1da177e4
LT		 1425
1426/* Join to solicited addr multicast group. */
1427
1428void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1429{
1430 struct in6_addr maddr;
1431
1432 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1433 return;
1434
1435 addrconf_addr_solict_mult(addr, &maddr);
1436 ipv6_dev_mc_inc(dev, &maddr);
1437}
1438
1439void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1440{
1441 struct in6_addr maddr;
1442
1443 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1444 return;
1445
1446 addrconf_addr_solict_mult(addr, &maddr);
1447 __ipv6_dev_mc_dec(idev, &maddr);
1448}
1449
20380731 1450static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1451{
1452 struct in6_addr addr;
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;
1462 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1463 if (ipv6_addr_any(&addr))
1464 return;
1465 __ipv6_dev_ac_dec(ifp->idev, &addr);
1466}
1467
073a8e0e
YH		 1468static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1469{
1470 if (dev->addr_len != ETH_ALEN)
1471 return -1;
1472 memcpy(eui, dev->dev_addr, 3);
1473 memcpy(eui + 5, dev->dev_addr + 3, 3);
1474
1475 /*
1476 * The zSeries OSA network cards can be shared among various
1477 * OS instances, but the OSA cards have only one MAC address.
1478 * This leads to duplicate address conflicts in conjunction
1479 * with IPv6 if more than one instance uses the same card.
1480 *
1481 * The driver for these cards can deliver a unique 16-bit
1482 * identifier for each instance sharing the same card. It is
1483 * placed instead of 0xFFFE in the interface identifier. The
1484 * "u" bit of the interface identifier is not inverted in this
1485 * case. Hence the resulting interface identifier has local
1486 * scope according to RFC2373.
1487 */
1488 if (dev->dev_id) {
1489 eui[3] = (dev->dev_id >> 8) & 0xFF;
1490 eui[4] = dev->dev_id & 0xFF;
1491 } else {
1492 eui[3] = 0xFF;
1493 eui[4] = 0xFE;
1494 eui[0] ^= 2;
1495 }
1496 return 0;
1497}
1498
1499static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1500{
1501 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1502 if (dev->addr_len != ARCNET_ALEN)
1503 return -1;
1504 memset(eui, 0, 7);
1505 eui[7] = *(u8*)dev->dev_addr;
1506 return 0;
1507}
1508
1509static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1510{
1511 if (dev->addr_len != INFINIBAND_ALEN)
1512 return -1;
1513 memcpy(eui, dev->dev_addr + 12, 8);
1514 eui[0] |= 2;
1515 return 0;
1516}
1517
dfd982ba
YH		 1518int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1519{
9af28511
SH		 1520 if (addr == 0)
1521 return -1;
dfd982ba
YH		 1522 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1523 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1524 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1525 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1526 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1527 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1528 eui[1] = 0;
1529 eui[2] = 0x5E;
1530 eui[3] = 0xFE;
1531 memcpy(eui + 4, &addr, 4);
1532 return 0;
1533}
1534EXPORT_SYMBOL(__ipv6_isatap_ifid);
1535
1536static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1537{
1538 if (dev->priv_flags & IFF_ISATAP)
1539 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1540 return -1;
1541}
1542
1da177e4
LT		 1543static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1544{
1545 switch (dev->type) {
1546 case ARPHRD_ETHER:
1547 case ARPHRD_FDDI:
1548 case ARPHRD_IEEE802_TR:
073a8e0e 1549 return addrconf_ifid_eui48(eui, dev);
1da177e4 1550 case ARPHRD_ARCNET:
073a8e0e 1551 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1552 case ARPHRD_INFINIBAND:
073a8e0e 1553 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1554 case ARPHRD_SIT:
dfd982ba 1555 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1556 }
1557 return -1;
1558}
1559
1560static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1561{
1562 int err = -1;
1563 struct inet6_ifaddr *ifp;
1564
1565 read_lock_bh(&idev->lock);
502a2ffd 1566 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1567 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1568 memcpy(eui, ifp->addr.s6_addr+8, 8);
1569 err = 0;
1570 break;
1571 }
1572 }
1573 read_unlock_bh(&idev->lock);
1574 return err;
1575}
1576
1577#ifdef CONFIG_IPV6_PRIVACY
1578/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1579static int __ipv6_regen_rndid(struct inet6_dev *idev)
1580{
1da177e4 1581regen:
955189ef 1582 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1583 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1584
1585 /*
1586 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1587 * check if generated address is not inappropriate
1588 *
1589 * - Reserved subnet anycast (RFC 2526)
1590 * 11111101 11....11 1xxxxxxx
c7dc89c0 1591 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1592 * 00-00-5E-FE-xx-xx-xx-xx
1593 * - value 0
1594 * - XXX: already assigned to an address on the device
1595 */
1ab1457c 1596 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1597 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1598 (idev->rndid[7]&0x80))
1599 goto regen;
1600 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1601 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1602 goto regen;
1603 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1604 goto regen;
1605 }
1606
1607 return 0;
1608}
1609
1610static void ipv6_regen_rndid(unsigned long data)
1611{
1612 struct inet6_dev *idev = (struct inet6_dev *) data;
1613 unsigned long expires;
1614
8814c4b5 1615 rcu_read_lock_bh();
1da177e4
LT		 1616 write_lock_bh(&idev->lock);
1617
1618 if (idev->dead)
1619 goto out;
1620
1621 if (__ipv6_regen_rndid(idev) < 0)
1622 goto out;
1ab1457c 1623
1da177e4 1624 expires = jiffies +
1ab1457c 1625 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1626 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1627 if (time_before(expires, jiffies)) {
1628 printk(KERN_WARNING
1629 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1630 idev->dev->name);
1631 goto out;
1632 }
1633
1634 if (!mod_timer(&idev->regen_timer, expires))
1635 in6_dev_hold(idev);
1636
1637out:
1638 write_unlock_bh(&idev->lock);
8814c4b5 1639 rcu_read_unlock_bh();
1da177e4
LT		 1640 in6_dev_put(idev);
1641}
1642
1643static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1644 int ret = 0;
1645
1646 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1647 ret = __ipv6_regen_rndid(idev);
1648 return ret;
1649}
1650#endif
1651
1652/*
1653 * Add prefix route.
1654 */
1655
1656static void
1657addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1658 unsigned long expires, u32 flags)
1da177e4 1659{
86872cb5
TG		 1660 struct fib6_config cfg = {
1661 .fc_table = RT6_TABLE_PREFIX,
1662 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1663 .fc_ifindex = dev->ifindex,
1664 .fc_expires = expires,
1665 .fc_dst_len = plen,
1666 .fc_flags = RTF_UP | flags,
c346dca1 1667 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1668 .fc_protocol = RTPROT_KERNEL,
86872cb5 1669 };
1da177e4 1670
86872cb5 1671 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1672
1673 /* Prevent useless cloning on PtP SIT.
1674 This thing is done here expecting that the whole
1675 class of non-broadcast devices need not cloning.
1676 */
0be669bb 1677#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1678 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1679 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1680#endif
1da177e4 1681
86872cb5 1682 ip6_route_add(&cfg);
1da177e4
LT		 1683}
1684
1685/* Create "default" multicast route to the interface */
1686
1687static void addrconf_add_mroute(struct net_device *dev)
1688{
86872cb5
TG		 1689 struct fib6_config cfg = {
1690 .fc_table = RT6_TABLE_LOCAL,
1691 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692 .fc_ifindex = dev->ifindex,
1693 .fc_dst_len = 8,
1694 .fc_flags = RTF_UP,
c346dca1 1695 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1696 };
1697
1698 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1699
1700 ip6_route_add(&cfg);
1da177e4
LT		 1701}
1702
0be669bb 1703#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1704static void sit_route_add(struct net_device *dev)
1705{
86872cb5
TG		 1706 struct fib6_config cfg = {
1707 .fc_table = RT6_TABLE_MAIN,
1708 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1709 .fc_ifindex = dev->ifindex,
1710 .fc_dst_len = 96,
1711 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1712 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1713 };
1da177e4
LT		 1714
1715 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1716 ip6_route_add(&cfg);
1da177e4 1717}
0be669bb 1718#endif
1da177e4
LT		 1719
1720static void addrconf_add_lroute(struct net_device *dev)
1721{
1722 struct in6_addr addr;
1723
1724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1725 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1726}
1727
1728static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1729{
1730 struct inet6_dev *idev;
1731
1732 ASSERT_RTNL();
1733
e21e8467
SH		 1734 idev = ipv6_find_idev(dev);
1735 if (!idev)
1da177e4
LT		 1736 return NULL;
1737
1738 /* Add default multicast route */
1739 addrconf_add_mroute(dev);
1740
1741 /* Add link local route */
1742 addrconf_add_lroute(dev);
1743 return idev;
1744}
1745
1746void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1747{
1748 struct prefix_info *pinfo;
1749 __u32 valid_lft;
1750 __u32 prefered_lft;
1751 int addr_type;
1da177e4 1752 struct inet6_dev *in6_dev;
56d417b1 1753 struct net *net = dev_net(dev);
1da177e4
LT		 1754
1755 pinfo = (struct prefix_info *) opt;
1ab1457c 1756
1da177e4
LT		 1757 if (len < sizeof(struct prefix_info)) {
1758 ADBG(("addrconf: prefix option too short\n"));
1759 return;
1760 }
1ab1457c 1761
1da177e4
LT		 1762 /*
1763 * Validation checks ([ADDRCONF], page 19)
1764 */
1765
1766 addr_type = ipv6_addr_type(&pinfo->prefix);
1767
1768 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1769 return;
1770
1771 valid_lft = ntohl(pinfo->valid);
1772 prefered_lft = ntohl(pinfo->prefered);
1773
1774 if (prefered_lft > valid_lft) {
1775 if (net_ratelimit())
1776 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1777 return;
1778 }
1779
1780 in6_dev = in6_dev_get(dev);
1781
1782 if (in6_dev == NULL) {
1783 if (net_ratelimit())
1784 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1785 return;
1786 }
1787
1788 /*
1789 * Two things going on here:
1790 * 1) Add routes for on-link prefixes
1791 * 2) Configure prefixes with the auto flag set
1792 */
1793
4bed72e4
YH		 1794 if (pinfo->onlink) {
1795 struct rt6_info *rt;
1796 unsigned long rt_expires;
1797
6f704992
YH		 1798 /* Avoid arithmetic overflow. Really, we could
1799 * save rt_expires in seconds, likely valid_lft,
1800 * but it would require division in fib gc, that it
1801 * not good.
1802 */
4bed72e4
YH		 1803 if (HZ > USER_HZ)
1804 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1805 else
1806 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1807
4bed72e4
YH		 1808 if (addrconf_finite_timeout(rt_expires))
1809 rt_expires *= HZ;
1da177e4 1810
56d417b1 1811 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1812 dev->ifindex, 1);
1da177e4 1813
2b5ead46 1814 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1815 /* Autoconf prefix route */
1816 if (valid_lft == 0) {
1817 ip6_del_rt(rt);
1818 rt = NULL;
4bed72e4 1819 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1820 /* not infinity */
1821 rt->rt6i_expires = jiffies + rt_expires;
1822 rt->rt6i_flags |= RTF_EXPIRES;
1823 } else {
1824 rt->rt6i_flags &= ~RTF_EXPIRES;
1825 rt->rt6i_expires = 0;
1da177e4
LT		 1826 }
1827 } else if (valid_lft) {
6f704992 1828 clock_t expires = 0;
4bed72e4
YH		 1829 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1830 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1831 /* not infinity */
1832 flags |= RTF_EXPIRES;
1833 expires = jiffies_to_clock_t(rt_expires);
1834 }
1da177e4 1835 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1836 dev, expires, flags);
1da177e4
LT		 1837 }
1838 if (rt)
1839 dst_release(&rt->u.dst);
1840 }
1841
1842 /* Try to figure out our local address for this prefix */
1843
1844 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1845 struct inet6_ifaddr * ifp;
1846 struct in6_addr addr;
1847 int create = 0, update_lft = 0;
1848
1849 if (pinfo->prefix_len == 64) {
1850 memcpy(&addr, &pinfo->prefix, 8);
1851 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1852 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1853 in6_dev_put(in6_dev);
1854 return;
1855 }
1856 goto ok;
1857 }
1858 if (net_ratelimit())
1859 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1860 pinfo->prefix_len);
1861 in6_dev_put(in6_dev);
1862 return;
1863
1864ok:
1865
53b7997f 1866 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1867
1868 if (ifp == NULL && valid_lft) {
1869 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1870 u32 addr_flags = 0;
1871
1872#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1873 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1874 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1875 addr_flags = IFA_F_OPTIMISTIC;
1876#endif
1da177e4
LT		 1877
1878 /* Do not allow to create too much of autoconfigured
1879 * addresses; this would be too easy way to crash kernel.
1880 */
1881 if (!max_addresses ||
1882 ipv6_count_addresses(in6_dev) < max_addresses)
1883 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1884 addr_type&IPV6_ADDR_SCOPE_MASK,
1885 addr_flags);
1da177e4
LT		 1886
1887 if (!ifp || IS_ERR(ifp)) {
1888 in6_dev_put(in6_dev);
1889 return;
1890 }
1891
1892 update_lft = create = 1;
1893 ifp->cstamp = jiffies;
1894 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1895 }
1896
1897 if (ifp) {
1898 int flags;
1899 unsigned long now;
1900#ifdef CONFIG_IPV6_PRIVACY
1901 struct inet6_ifaddr *ift;
1902#endif
1903 u32 stored_lft;
1904
1905 /* update lifetime (RFC2462 5.5.3 e) */
1906 spin_lock(&ifp->lock);
1907 now = jiffies;
1908 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1909 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1910 else
1911 stored_lft = 0;
1912 if (!update_lft && stored_lft) {
1913 if (valid_lft > MIN_VALID_LIFETIME ||
1914 valid_lft > stored_lft)
1915 update_lft = 1;
1916 else if (stored_lft <= MIN_VALID_LIFETIME) {
1917 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1918 /*
1919 * RFC 4862 Section 5.5.3e:
1920 * "Note that the preferred lifetime of
1921 * the corresponding address is always
1922 * reset to the Preferred Lifetime in
1923 * the received Prefix Information
1924 * option, regardless of whether the
1925 * valid lifetime is also reset or
1926 * ignored."
1927 *
1928 * So if the preferred lifetime in
1929 * this advertisement is different
1930 * than what we have stored, but the
1931 * valid lifetime is invalid, just
1932 * reset prefered_lft.
1933 *
1934 * We must set the valid lifetime
1935 * to the stored lifetime since we'll
1936 * be updating the timestamp below,
1937 * else we'll set it back to the
1938 * minumum.
1939 */
1940 if (prefered_lft != ifp->prefered_lft) {
1941 valid_lft = stored_lft;
1942 update_lft = 1;
1943 }
1da177e4
LT		 1944 } else {
1945 valid_lft = MIN_VALID_LIFETIME;
1946 if (valid_lft < prefered_lft)
1947 prefered_lft = valid_lft;
1948 update_lft = 1;
1949 }
1950 }
1951
1952 if (update_lft) {
1953 ifp->valid_lft = valid_lft;
1954 ifp->prefered_lft = prefered_lft;
1955 ifp->tstamp = now;
1956 flags = ifp->flags;
1957 ifp->flags &= ~IFA_F_DEPRECATED;
1958 spin_unlock(&ifp->lock);
1959
1960 if (!(flags&IFA_F_TENTATIVE))
1961 ipv6_ifa_notify(0, ifp);
1962 } else
1963 spin_unlock(&ifp->lock);
1964
1965#ifdef CONFIG_IPV6_PRIVACY
1966 read_lock_bh(&in6_dev->lock);
1967 /* update all temporary addresses in the list */
372e6c8f 1968 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1969 /*
1970 * When adjusting the lifetimes of an existing
1971 * temporary address, only lower the lifetimes.
1972 * Implementations must not increase the
1973 * lifetimes of an existing temporary address
1974 * when processing a Prefix Information Option.
1975 */
c6fbfac2
BB		 1976 if (ifp != ift->ifpub)
1977 continue;
1978
1da177e4
LT		 1979 spin_lock(&ift->lock);
1980 flags = ift->flags;
1981 if (ift->valid_lft > valid_lft &&
1982 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1983 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1984 if (ift->prefered_lft > prefered_lft &&
1985 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1986 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1987 spin_unlock(&ift->lock);
1988 if (!(flags&IFA_F_TENTATIVE))
1989 ipv6_ifa_notify(0, ift);
1990 }
1991
1992 if (create && in6_dev->cnf.use_tempaddr > 0) {
1993 /*
1994 * When a new public address is created as described in [ADDRCONF],
1995 * also create a new temporary address.
1996 */
1ab1457c 1997 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1998 ipv6_create_tempaddr(ifp, NULL);
1999 } else {
2000 read_unlock_bh(&in6_dev->lock);
2001 }
2002#endif
2003 in6_ifa_put(ifp);
2004 addrconf_verify(0);
2005 }
2006 }
2007 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2008 in6_dev_put(in6_dev);
2009}
2010
2011/*
2012 * Set destination address.
2013 * Special case for SIT interfaces where we create a new "virtual"
2014 * device.
2015 */
af284937 2016int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2017{
2018 struct in6_ifreq ireq;
2019 struct net_device *dev;
2020 int err = -EINVAL;
2021
2022 rtnl_lock();
2023
2024 err = -EFAULT;
2025 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2026 goto err_exit;
2027
af284937 2028 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2029
2030 err = -ENODEV;
2031 if (dev == NULL)
2032 goto err_exit;
2033
0be669bb 2034#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2035 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2036 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2037 struct ifreq ifr;
1da177e4
LT		 2038 struct ip_tunnel_parm p;
2039
2040 err = -EADDRNOTAVAIL;
2041 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2042 goto err_exit;
2043
2044 memset(&p, 0, sizeof(p));
2045 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2046 p.iph.saddr = 0;
2047 p.iph.version = 4;
2048 p.iph.ihl = 5;
2049 p.iph.protocol = IPPROTO_IPV6;
2050 p.iph.ttl = 64;
d20b3109 2051 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2052
5bc3eb7e
SH		 2053 if (ops->ndo_do_ioctl) {
2054 mm_segment_t oldfs = get_fs();
2055
2056 set_fs(KERNEL_DS);
2057 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2058 set_fs(oldfs);
2059 } else
2060 err = -EOPNOTSUPP;
1da177e4
LT		 2061
2062 if (err == 0) {
2063 err = -ENOBUFS;
af284937
DL		 2064 dev = __dev_get_by_name(net, p.name);
2065 if (!dev)
1da177e4
LT		 2066 goto err_exit;
2067 err = dev_open(dev);
2068 }
2069 }
0be669bb 2070#endif
1da177e4
LT		 2071
2072err_exit:
2073 rtnl_unlock();
2074 return err;
2075}
2076
2077/*
2078 * Manual configuration of address on an interface
2079 */
af284937 2080static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2081 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2082 __u32 valid_lft)
1da177e4
LT		 2083{
2084 struct inet6_ifaddr *ifp;
2085 struct inet6_dev *idev;
2086 struct net_device *dev;
2087 int scope;
6f704992
YH		 2088 u32 flags;
2089 clock_t expires;
4bed72e4 2090 unsigned long timeout;
1da177e4
LT		 2091
2092 ASSERT_RTNL();
1ab1457c 2093
24ef0da7
TG		 2094 if (plen > 128)
2095 return -EINVAL;
2096
0778769d
NT		 2097 /* check the lifetime */
2098 if (!valid_lft || prefered_lft > valid_lft)
2099 return -EINVAL;
2100
af284937
DL		 2101 dev = __dev_get_by_index(net, ifindex);
2102 if (!dev)
1da177e4 2103 return -ENODEV;
1ab1457c 2104
1da177e4
LT		 2105 if ((idev = addrconf_add_dev(dev)) == NULL)
2106 return -ENOBUFS;
2107
2108 scope = ipv6_addr_scope(pfx);
2109
4bed72e4
YH		 2110 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2111 if (addrconf_finite_timeout(timeout)) {
2112 expires = jiffies_to_clock_t(timeout * HZ);
2113 valid_lft = timeout;
6f704992 2114 flags = RTF_EXPIRES;
4bed72e4
YH		 2115 } else {
2116 expires = 0;
2117 flags = 0;
2118 ifa_flags |= IFA_F_PERMANENT;
6f704992 2119 }
0778769d 2120
4bed72e4
YH		 2121 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2122 if (addrconf_finite_timeout(timeout)) {
2123 if (timeout == 0)
2124 ifa_flags |= IFA_F_DEPRECATED;
2125 prefered_lft = timeout;
2126 }
0778769d
NT		 2127
2128 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2129
1da177e4 2130 if (!IS_ERR(ifp)) {
06aebfb7 2131 spin_lock_bh(&ifp->lock);
0778769d
NT		 2132 ifp->valid_lft = valid_lft;
2133 ifp->prefered_lft = prefered_lft;
2134 ifp->tstamp = jiffies;
06aebfb7 2135 spin_unlock_bh(&ifp->lock);
0778769d 2136
46d48046 2137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2138 expires, flags);
95c385b4
NH		 2139 /*
2140 * Note that section 3.1 of RFC 4429 indicates
2141 * that the Optimistic flag should not be set for
2142 * manually configured addresses
2143 */
1da177e4
LT		 2144 addrconf_dad_start(ifp, 0);
2145 in6_ifa_put(ifp);
0778769d 2146 addrconf_verify(0);
1da177e4
LT		 2147 return 0;
2148 }
2149
2150 return PTR_ERR(ifp);
2151}
2152
af284937 2153static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2154 unsigned int plen)
1da177e4
LT		 2155{
2156 struct inet6_ifaddr *ifp;
2157 struct inet6_dev *idev;
2158 struct net_device *dev;
1ab1457c 2159
24ef0da7
TG		 2160 if (plen > 128)
2161 return -EINVAL;
2162
af284937
DL		 2163 dev = __dev_get_by_index(net, ifindex);
2164 if (!dev)
1da177e4
LT		 2165 return -ENODEV;
2166
2167 if ((idev = __in6_dev_get(dev)) == NULL)
2168 return -ENXIO;
2169
2170 read_lock_bh(&idev->lock);
502a2ffd 2171 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2172 if (ifp->prefix_len == plen &&
2173 ipv6_addr_equal(pfx, &ifp->addr)) {
2174 in6_ifa_hold(ifp);
2175 read_unlock_bh(&idev->lock);
1ab1457c 2176
1da177e4
LT		 2177 ipv6_del_addr(ifp);
2178
2179 /* If the last address is deleted administratively,
2180 disable IPv6 on this interface.
2181 */
502a2ffd 2182 if (list_empty(&idev->addr_list))
1da177e4
LT		 2183 addrconf_ifdown(idev->dev, 1);
2184 return 0;
2185 }
2186 }
2187 read_unlock_bh(&idev->lock);
2188 return -EADDRNOTAVAIL;
2189}
2190
2191
af284937 2192int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2193{
2194 struct in6_ifreq ireq;
2195 int err;
1ab1457c 2196
1da177e4
LT		 2197 if (!capable(CAP_NET_ADMIN))
2198 return -EPERM;
1ab1457c 2199
1da177e4
LT		 2200 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2201 return -EFAULT;
2202
2203 rtnl_lock();
af284937
DL		 2204 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2205 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2206 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2207 rtnl_unlock();
2208 return err;
2209}
2210
af284937 2211int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2212{
2213 struct in6_ifreq ireq;
2214 int err;
1ab1457c 2215
1da177e4
LT		 2216 if (!capable(CAP_NET_ADMIN))
2217 return -EPERM;
2218
2219 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2220 return -EFAULT;
2221
2222 rtnl_lock();
af284937
DL		 2223 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2224 ireq.ifr6_prefixlen);
1da177e4
LT		 2225 rtnl_unlock();
2226 return err;
2227}
2228
b5f348e5
IJ		 2229static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2230 int plen, int scope)
2231{
2232 struct inet6_ifaddr *ifp;
2233
2234 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2235 if (!IS_ERR(ifp)) {
2236 spin_lock_bh(&ifp->lock);
2237 ifp->flags &= ~IFA_F_TENTATIVE;
2238 spin_unlock_bh(&ifp->lock);
2239 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2240 in6_ifa_put(ifp);
2241 }
2242}
2243
0be669bb 2244#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2245static void sit_add_v4_addrs(struct inet6_dev *idev)
2246{
1da177e4
LT		 2247 struct in6_addr addr;
2248 struct net_device *dev;
c346dca1 2249 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2250 int scope;
2251
2252 ASSERT_RTNL();
2253
2254 memset(&addr, 0, sizeof(struct in6_addr));
2255 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2256
2257 if (idev->dev->flags&IFF_POINTOPOINT) {
2258 addr.s6_addr32[0] = htonl(0xfe800000);
2259 scope = IFA_LINK;
2260 } else {
2261 scope = IPV6_ADDR_COMPATv4;
2262 }
2263
2264 if (addr.s6_addr32[3]) {
b5f348e5 2265 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2266 return;
2267 }
2268
6fda7350 2269 for_each_netdev(net, dev) {
e5ed6399 2270 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2271 if (in_dev && (dev->flags & IFF_UP)) {
2272 struct in_ifaddr * ifa;
2273
2274 int flag = scope;
2275
2276 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2277 int plen;
2278
2279 addr.s6_addr32[3] = ifa->ifa_local;
2280
2281 if (ifa->ifa_scope == RT_SCOPE_LINK)
2282 continue;
2283 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2284 if (idev->dev->flags&IFF_POINTOPOINT)
2285 continue;
2286 flag |= IFA_HOST;
2287 }
2288 if (idev->dev->flags&IFF_POINTOPOINT)
2289 plen = 64;
2290 else
2291 plen = 96;
2292
b5f348e5 2293 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2294 }
2295 }
1ab1457c 2296 }
1da177e4 2297}
0be669bb 2298#endif
1da177e4
LT		 2299
2300static void init_loopback(struct net_device *dev)
2301{
2302 struct inet6_dev *idev;
1da177e4
LT		 2303
2304 /* ::1 */
2305
2306 ASSERT_RTNL();
2307
2308 if ((idev = ipv6_find_idev(dev)) == NULL) {
2309 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2310 return;
2311 }
2312
b5f348e5 2313 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2314}
2315
2316static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2317{
2318 struct inet6_ifaddr * ifp;
95c385b4
NH		 2319 u32 addr_flags = IFA_F_PERMANENT;
2320
2321#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2322 if (idev->cnf.optimistic_dad &&
702beb87 2323 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2324 addr_flags |= IFA_F_OPTIMISTIC;
2325#endif
1da177e4 2326
95c385b4
NH		 2327
2328 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2329 if (!IS_ERR(ifp)) {
46d48046 2330 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2331 addrconf_dad_start(ifp, 0);
2332 in6_ifa_put(ifp);
2333 }
2334}
2335
2336static void addrconf_dev_config(struct net_device *dev)
2337{
2338 struct in6_addr addr;
2339 struct inet6_dev * idev;
2340
2341 ASSERT_RTNL();
2342
74235a25
HX		 2343 if ((dev->type != ARPHRD_ETHER) &&
2344 (dev->type != ARPHRD_FDDI) &&
2345 (dev->type != ARPHRD_IEEE802_TR) &&
2346 (dev->type != ARPHRD_ARCNET) &&
2347 (dev->type != ARPHRD_INFINIBAND)) {
2348 /* Alas, we support only Ethernet autoconfiguration. */
2349 return;
2350 }
2351
1da177e4
LT		 2352 idev = addrconf_add_dev(dev);
2353 if (idev == NULL)
2354 return;
2355
2356 memset(&addr, 0, sizeof(struct in6_addr));
2357 addr.s6_addr32[0] = htonl(0xFE800000);
2358
2359 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2360 addrconf_add_linklocal(idev, &addr);
2361}
2362
0be669bb 2363#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2364static void addrconf_sit_config(struct net_device *dev)
2365{
2366 struct inet6_dev *idev;
2367
2368 ASSERT_RTNL();
2369
1ab1457c
YH		 2370 /*
2371 * Configure the tunnel with one of our IPv4
2372 * addresses... we should configure all of
1da177e4
LT		 2373 * our v4 addrs in the tunnel
2374 */
2375
2376 if ((idev = ipv6_find_idev(dev)) == NULL) {
2377 printk(KERN_DEBUG "init sit: add_dev failed\n");
2378 return;
2379 }
2380
c7dc89c0
FT		 2381 if (dev->priv_flags & IFF_ISATAP) {
2382 struct in6_addr addr;
2383
2384 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2385 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2386 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2387 addrconf_add_linklocal(idev, &addr);
2388 return;
2389 }
2390
1da177e4
LT		 2391 sit_add_v4_addrs(idev);
2392
2393 if (dev->flags&IFF_POINTOPOINT) {
2394 addrconf_add_mroute(dev);
2395 addrconf_add_lroute(dev);
2396 } else
2397 sit_route_add(dev);
2398}
0be669bb 2399#endif
1da177e4
LT		 2400
2401static inline int
2402ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2403{
2404 struct in6_addr lladdr;
2405
95c385b4 2406 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2407 addrconf_add_linklocal(idev, &lladdr);
2408 return 0;
2409 }
2410 return -1;
2411}
2412
2413static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2414{
2415 struct net_device *link_dev;
c346dca1 2416 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2417
2418 /* first try to inherit the link-local address from the link device */
2419 if (idev->dev->iflink &&
6fda7350 2420 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2421 if (!ipv6_inherit_linklocal(idev, link_dev))
2422 return;
2423 }
2424 /* then try to inherit it from any device */
6fda7350 2425 for_each_netdev(net, link_dev) {
1da177e4
LT		 2426 if (!ipv6_inherit_linklocal(idev, link_dev))
2427 return;
2428 }
2429 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2430}
2431
2432/*
2433 * Autoconfigure tunnel with a link-local address so routing protocols,
2434 * DHCPv6, MLD etc. can be run over the virtual link
2435 */
2436
2437static void addrconf_ip6_tnl_config(struct net_device *dev)
2438{
2439 struct inet6_dev *idev;
2440
2441 ASSERT_RTNL();
2442
e21e8467
SH		 2443 idev = addrconf_add_dev(dev);
2444 if (!idev) {
1da177e4
LT		 2445 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2446 return;
2447 }
2448 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2449}
2450
1ab1457c 2451static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2452 void * data)
2453{
2454 struct net_device *dev = (struct net_device *) data;
74235a25 2455 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2456 int run_pending = 0;
b217d616 2457 int err;
1da177e4 2458
e21e8467 2459 switch (event) {
45ba9dd2 2460 case NETDEV_REGISTER:
74235a25 2461 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2462 idev = ipv6_add_dev(dev);
2463 if (!idev)
b217d616 2464 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2465 }
2466 break;
bcdd553f 2467
1da177e4 2468 case NETDEV_UP:
3c21edbd 2469 case NETDEV_CHANGE:
c2edacf8
JV		 2470 if (dev->flags & IFF_SLAVE)
2471 break;
2472
3c21edbd 2473 if (event == NETDEV_UP) {
f24e3d65 2474 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2475 /* device is not ready yet. */
2476 printk(KERN_INFO
2477 "ADDRCONF(NETDEV_UP): %s: "
2478 "link is not ready\n",
2479 dev->name);
2480 break;
2481 }
99081049 2482
d31c7b8f
EP		 2483 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2484 idev = ipv6_add_dev(dev);
2485
e3ec6cfc 2486 if (idev) {
99081049 2487 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2488 run_pending = 1;
2489 }
3c21edbd 2490 } else {
f24e3d65 2491 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2492 /* device is still not ready. */
2493 break;
2494 }
2495
2496 if (idev) {
bcdd553f 2497 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2498 /* device is already configured. */
2499 break;
3c21edbd
YH		 2500 idev->if_flags |= IF_READY;
2501 }
2502
2503 printk(KERN_INFO
2504 "ADDRCONF(NETDEV_CHANGE): %s: "
2505 "link becomes ready\n",
2506 dev->name);
2507
c5e33bdd 2508 run_pending = 1;
3c21edbd
YH		 2509 }
2510
e21e8467 2511 switch (dev->type) {
0be669bb 2512#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2513 case ARPHRD_SIT:
2514 addrconf_sit_config(dev);
2515 break;
0be669bb 2516#endif
1da177e4
LT		 2517 case ARPHRD_TUNNEL6:
2518 addrconf_ip6_tnl_config(dev);
2519 break;
2520 case ARPHRD_LOOPBACK:
2521 init_loopback(dev);
2522 break;
2523
2524 default:
2525 addrconf_dev_config(dev);
2526 break;
3ff50b79 2527 }
bcdd553f 2528
1da177e4 2529 if (idev) {
c5e33bdd
YH		 2530 if (run_pending)
2531 addrconf_dad_run(idev);
2532
bcdd553f
SH		 2533 /*
2534 * If the MTU changed during the interface down,
2535 * when the interface up, the changed MTU must be
2536 * reflected in the idev as well as routers.
1da177e4 2537 */
bcdd553f
SH		 2538 if (idev->cnf.mtu6 != dev->mtu &&
2539 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2540 rt6_mtu_change(dev, dev->mtu);
2541 idev->cnf.mtu6 = dev->mtu;
2542 }
2543 idev->tstamp = jiffies;
2544 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2545
2546 /*
2547 * If the changed mtu during down is lower than
2548 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2549 */
2550 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2551 addrconf_ifdown(dev, 1);
1da177e4
LT		 2552 }
2553 break;
2554
2555 case NETDEV_CHANGEMTU:
d31c7b8f 2556 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2557 rt6_mtu_change(dev, dev->mtu);
2558 idev->cnf.mtu6 = dev->mtu;
2559 break;
2560 }
2561
d31c7b8f
EP		 2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2563 idev = ipv6_add_dev(dev);
2564 if (idev)
2565 break;
2566 }
2567
bcdd553f
SH		 2568 /*
2569 * MTU falled under IPV6_MIN_MTU.
2570 * Stop IPv6 on this interface.
2571 */
1da177e4
LT		 2572
2573 case NETDEV_DOWN:
2574 case NETDEV_UNREGISTER:
2575 /*
2576 * Remove all addresses from this interface.
2577 */
2578 addrconf_ifdown(dev, event != NETDEV_DOWN);
2579 break;
3c21edbd 2580
1da177e4 2581 case NETDEV_CHANGENAME:
1da177e4 2582 if (idev) {
5632c515 2583 snmp6_unregister_dev(idev);
408c4768 2584 addrconf_sysctl_unregister(idev);
f52295a9 2585 addrconf_sysctl_register(idev);
b217d616
HX		 2586 err = snmp6_register_dev(idev);
2587 if (err)
2588 return notifier_from_errno(err);
5632c515 2589 }
1da177e4 2590 break;
bcdd553f 2591
93d9b7d7
JP		 2592 case NETDEV_PRE_TYPE_CHANGE:
2593 case NETDEV_POST_TYPE_CHANGE:
2594 addrconf_type_change(dev, event);
75c78500 2595 break;
3ff50b79 2596 }
1da177e4
LT		 2597
2598 return NOTIFY_OK;
2599}
2600
2601/*
2602 * addrconf module should be notified of a device going up
2603 */
2604static struct notifier_block ipv6_dev_notf = {
2605 .notifier_call = addrconf_notify,
1da177e4
LT		 2606};
2607
93d9b7d7 2608static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2609{
2610 struct inet6_dev *idev;
2611 ASSERT_RTNL();
2612
2613 idev = __in6_dev_get(dev);
2614
93d9b7d7 2615 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2616 ipv6_mc_remap(idev);
93d9b7d7 2617 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2618 ipv6_mc_unmap(idev);
2619}
2620
1da177e4
LT		 2621static int addrconf_ifdown(struct net_device *dev, int how)
2622{
c346dca1 2623 struct net *net = dev_net(dev);
502a2ffd 2624 struct inet6_dev *idev;
2625 struct inet6_ifaddr *ifa;
2626 LIST_HEAD(keep_list);
1da177e4
LT		 2627
2628 ASSERT_RTNL();
2629
f3db4851 2630 rt6_ifdown(net, dev);
1da177e4
LT		 2631 neigh_ifdown(&nd_tbl, dev);
2632
2633 idev = __in6_dev_get(dev);
2634 if (idev == NULL)
2635 return -ENODEV;
2636
bcdd553f
SH		 2637 /*
2638 * Step 1: remove reference to ipv6 device from parent device.
2639 * Do not dev_put!
1da177e4 2640 */
439e2385 2641 if (how) {
1da177e4 2642 idev->dead = 1;
8814c4b5
YH		 2643
2644 /* protected by rtnl_lock */
2645 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2646
2647 /* Step 1.5: remove snmp6 entry */
2648 snmp6_unregister_dev(idev);
2649
2650 }
2651
1da177e4
LT		 2652 write_lock_bh(&idev->lock);
2653
bcdd553f 2654 /* Step 2: clear flags for stateless addrconf */
439e2385 2655 if (!how)
3c21edbd 2656 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2657
1da177e4 2658#ifdef CONFIG_IPV6_PRIVACY
439e2385 2659 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2660 in6_dev_put(idev);
2661
bcdd553f 2662 /* Step 3: clear tempaddr list */
372e6c8f 2663 while (!list_empty(&idev->tempaddr_list)) {
2664 ifa = list_first_entry(&idev->tempaddr_list,
2665 struct inet6_ifaddr, tmp_list);
2666 list_del(&ifa->tmp_list);
1da177e4
LT		 2667 ifa->dead = 1;
2668 write_unlock_bh(&idev->lock);
2669 spin_lock_bh(&ifa->lock);
2670
2671 if (ifa->ifpub) {
2672 in6_ifa_put(ifa->ifpub);
2673 ifa->ifpub = NULL;
2674 }
2675 spin_unlock_bh(&ifa->lock);
2676 in6_ifa_put(ifa);
2677 write_lock_bh(&idev->lock);
2678 }
2679#endif
8f37ada5 2680
502a2ffd 2681 while (!list_empty(&idev->addr_list)) {
2682 ifa = list_first_entry(&idev->addr_list,
2683 struct inet6_ifaddr, if_list);
84e8b803 2684 addrconf_del_timer(ifa);
2685
2686 /* If just doing link down, and address is permanent
2687 and not link-local, then retain it. */
bcdd553f 2688 if (!how &&
84e8b803 2689 (ifa->flags&IFA_F_PERMANENT) &&
2690 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2691 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2692
84e8b803 2693 /* If not doing DAD on this address, just keep it. */
2694 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2695 idev->cnf.accept_dad <= 0 ||
2696 (ifa->flags & IFA_F_NODAD))
2697 continue;
2698
2699 /* If it was tentative already, no need to notify */
2700 if (ifa->flags & IFA_F_TENTATIVE)
2701 continue;
2702
2703 /* Flag it for later restoration when link comes up */
2704 ifa->flags |= IFA_F_TENTATIVE;
2705 in6_ifa_hold(ifa);
27bdb2ab 2706 write_unlock_bh(&idev->lock);
dc2b99f7 2707 } else {
502a2ffd 2708 list_del(&ifa->if_list);
dc2b99f7 2709 ifa->dead = 1;
27bdb2ab 2710 write_unlock_bh(&idev->lock);
1da177e4 2711
27bdb2ab 2712 /* clear hash table */
2713 spin_lock_bh(&addrconf_hash_lock);
2714 hlist_del_init_rcu(&ifa->addr_lst);
27bdb2ab 2715 spin_unlock_bh(&addrconf_hash_lock);
2716 }
c2e21293 2717
84e8b803 2718 __ipv6_ifa_notify(RTM_DELADDR, ifa);
8595805a 2719 if (ifa->dead)
2720 atomic_notifier_call_chain(&inet6addr_chain,
2721 NETDEV_DOWN, ifa);
84e8b803 2722 in6_ifa_put(ifa);
dc2b99f7 2723
84e8b803 2724 write_lock_bh(&idev->lock);
1da177e4 2725 }
8f37ada5 2726
502a2ffd 2727 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2728
1da177e4
LT		 2729 write_unlock_bh(&idev->lock);
2730
2731 /* Step 5: Discard multicast list */
439e2385 2732 if (how)
1da177e4
LT		 2733 ipv6_mc_destroy_dev(idev);
2734 else
2735 ipv6_mc_down(idev);
2736
1da177e4 2737 idev->tstamp = jiffies;
1ab1457c 2738
bcdd553f 2739 /* Last: Shot the device (if unregistered) */
439e2385 2740 if (how) {
408c4768 2741 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2742 neigh_parms_release(&nd_tbl, idev->nd_parms);
2743 neigh_ifdown(&nd_tbl, dev);
2744 in6_dev_put(idev);
2745 }
2746 return 0;
2747}
2748
2749static void addrconf_rs_timer(unsigned long data)
2750{
2751 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2752 struct inet6_dev *idev = ifp->idev;
1da177e4 2753
5b2a1953 2754 read_lock(&idev->lock);
2755 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2756 goto out;
2757
5b2a1953 2758 if (idev->cnf.forwarding)
2759 goto out;
2760
2761 /* Announcement received after solicitation was sent */
2762 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2763 goto out;
1da177e4
LT		 2764
2765 spin_lock(&ifp->lock);
5b2a1953 2766 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2767 /* The wait after the last probe can be shorter */
2768 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2769 (ifp->probes == idev->cnf.rtr_solicits) ?
2770 idev->cnf.rtr_solicit_delay :
2771 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2772 spin_unlock(&ifp->lock);
2773
5b2a1953 2774 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2775 } else {
2776 spin_unlock(&ifp->lock);
2777 /*
2778 * Note: we do not support deprecated "all on-link"
2779 * assumption any longer.
2780 */
2781 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2782 idev->dev->name);
1da177e4
LT		 2783 }
2784
2785out:
5b2a1953 2786 read_unlock(&idev->lock);
1da177e4
LT		 2787 in6_ifa_put(ifp);
2788}
2789
2790/*
2791 * Duplicate Address Detection
2792 */
3c21edbd
YH		 2793static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2794{
2795 unsigned long rand_num;
2796 struct inet6_dev *idev = ifp->idev;
2797
95c385b4
NH		 2798 if (ifp->flags & IFA_F_OPTIMISTIC)
2799 rand_num = 0;
2800 else
2801 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2802
3c21edbd
YH		 2803 ifp->probes = idev->cnf.dad_transmits;
2804 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2805}
2806
e431b8c0 2807static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2808{
2809 struct inet6_dev *idev = ifp->idev;
2810 struct net_device *dev = idev->dev;
1da177e4
LT		 2811
2812 addrconf_join_solict(dev, &ifp->addr);
2813
1da177e4 2814 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2815
2816 read_lock_bh(&idev->lock);
2817 if (ifp->dead)
2818 goto out;
1da177e4 2819
21809faf 2820 spin_lock(&ifp->lock);
1da177e4 2821 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2822 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2823 !(ifp->flags&IFA_F_TENTATIVE) ||
2824 ifp->flags & IFA_F_NODAD) {
cc411d0b 2825 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2826 spin_unlock(&ifp->lock);
1da177e4
LT		 2827 read_unlock_bh(&idev->lock);
2828
2829 addrconf_dad_completed(ifp);
2830 return;
2831 }
2832
6732bade 2833 if (!(idev->if_flags & IF_READY)) {
21809faf 2834 spin_unlock(&ifp->lock);
6732bade 2835 read_unlock_bh(&idev->lock);
3c21edbd 2836 /*
590a9887 2837 * If the device is not ready:
3c21edbd
YH		 2838 * - keep it tentative if it is a permanent address.
2839 * - otherwise, kill it.
2840 */
2841 in6_ifa_hold(ifp);
cc411d0b 2842 addrconf_dad_stop(ifp, 0);
6732bade 2843 return;
3c21edbd 2844 }
95c385b4
NH		 2845
2846 /*
2847 * Optimistic nodes can start receiving
2848 * Frames right away
2849 */
e21e8467 2850 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2851 ip6_ins_rt(ifp->rt);
2852
6732bade 2853 addrconf_dad_kick(ifp);
21809faf 2854 spin_unlock(&ifp->lock);
1da177e4
LT		 2855out:
2856 read_unlock_bh(&idev->lock);
2857}
2858
2859static void addrconf_dad_timer(unsigned long data)
2860{
2861 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2862 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2863 struct in6_addr mcaddr;
2864
122e4519 2865 read_lock(&idev->lock);
2866 if (idev->dead || !(idev->if_flags & IF_READY)) {
2867 read_unlock(&idev->lock);
1da177e4
LT		 2868 goto out;
2869 }
21809faf 2870
2871 spin_lock(&ifp->lock);
1da177e4
LT		 2872 if (ifp->probes == 0) {
2873 /*
2874 * DAD was successful
2875 */
2876
cc411d0b 2877 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2878 spin_unlock(&ifp->lock);
122e4519 2879 read_unlock(&idev->lock);
1da177e4
LT		 2880
2881 addrconf_dad_completed(ifp);
2882
2883 goto out;
2884 }
2885
2886 ifp->probes--;
2887 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2888 spin_unlock(&ifp->lock);
122e4519 2889 read_unlock(&idev->lock);
1da177e4
LT		 2890
2891 /* send a neighbour solicitation for our addr */
1da177e4 2892 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2893 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2894out:
2895 in6_ifa_put(ifp);
2896}
2897
2898static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2899{
e21e8467 2900 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2901
2902 /*
2903 * Configure the address for reception. Now it is valid.
2904 */
2905
2906 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2907
2908 /* If added prefix is link local and forwarding is off,
2909 start sending router solicitations.
2910 */
2911
2912 if (ifp->idev->cnf.forwarding == 0 &&
2913 ifp->idev->cnf.rtr_solicits > 0 &&
2914 (dev->flags&IFF_LOOPBACK) == 0 &&
2915 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2916 /*
2917 * If a host as already performed a random delay
2918 * [...] as part of DAD [...] there is no need
2919 * to delay again before sending the first RS
2920 */
f3ee4010 2921 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2922
2923 spin_lock_bh(&ifp->lock);
2924 ifp->probes = 1;
2925 ifp->idev->if_flags |= IF_RS_SENT;
2926 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2927 spin_unlock_bh(&ifp->lock);
2928 }
2929}
2930
e21e8467
SH		 2931static void addrconf_dad_run(struct inet6_dev *idev)
2932{
c5e33bdd
YH		 2933 struct inet6_ifaddr *ifp;
2934
2935 read_lock_bh(&idev->lock);
502a2ffd 2936 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2937 spin_lock(&ifp->lock);
c5e33bdd 2938 if (!(ifp->flags & IFA_F_TENTATIVE)) {
21809faf 2939 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2940 continue;
2941 }
21809faf 2942 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2943 addrconf_dad_kick(ifp);
2944 }
2945 read_unlock_bh(&idev->lock);
2946}
2947
1da177e4
LT		 2948#ifdef CONFIG_PROC_FS
2949struct if6_iter_state {
3c40090a 2950 struct seq_net_private p;
1da177e4
LT		 2951 int bucket;
2952};
2953
2954static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2955{
2956 struct inet6_ifaddr *ifa = NULL;
2957 struct if6_iter_state *state = seq->private;
1218854a 2958 struct net *net = seq_file_net(seq);
1da177e4
LT		 2959
2960 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 2961 struct hlist_node *n;
4f70ecca 2962 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 2963 addr_lst)
c2e21293 2964 if (net_eq(dev_net(ifa->idev->dev), net))
2965 return ifa;
1da177e4 2966 }
c2e21293 2967 return NULL;
1da177e4
LT		 2968}
2969
c2e21293 2970static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2971 struct inet6_ifaddr *ifa)
1da177e4
LT		 2972{
2973 struct if6_iter_state *state = seq->private;
1218854a 2974 struct net *net = seq_file_net(seq);
c2e21293 2975 struct hlist_node *n = &ifa->addr_lst;
1da177e4 2976
4f70ecca 2977 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 2978 if (net_eq(dev_net(ifa->idev->dev), net))
2979 return ifa;
3c40090a 2980
c2e21293 2981 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 2982 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 2983 &inet6_addr_lst[state->bucket], addr_lst) {
2984 if (net_eq(dev_net(ifa->idev->dev), net))
2985 return ifa;
2986 }
1da177e4 2987 }
3c40090a 2988
c2e21293 2989 return NULL;
1da177e4
LT		 2990}
2991
2992static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2993{
2994 struct inet6_ifaddr *ifa = if6_get_first(seq);
2995
2996 if (ifa)
e21e8467 2997 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 2998 --pos;
2999 return pos ? NULL : ifa;
3000}
3001
3002static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3003 __acquires(rcu_bh)
1da177e4 3004{
5c578aed 3005 rcu_read_lock_bh();
1da177e4
LT		 3006 return if6_get_idx(seq, *pos);
3007}
3008
3009static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3010{
3011 struct inet6_ifaddr *ifa;
3012
3013 ifa = if6_get_next(seq, v);
3014 ++*pos;
3015 return ifa;
3016}
3017
3018static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3019 __releases(rcu_bh)
1da177e4 3020{
5c578aed 3021 rcu_read_unlock_bh();
1da177e4
LT		 3022}
3023
3024static int if6_seq_show(struct seq_file *seq, void *v)
3025{
3026 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3027 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3028 &ifp->addr,
1da177e4
LT		 3029 ifp->idev->dev->ifindex,
3030 ifp->prefix_len,
3031 ifp->scope,
3032 ifp->flags,
3033 ifp->idev->dev->name);
3034 return 0;
3035}
3036
56b3d975 3037static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3038 .start = if6_seq_start,
3039 .next = if6_seq_next,
3040 .show = if6_seq_show,
3041 .stop = if6_seq_stop,
3042};
3043
3044static int if6_seq_open(struct inode *inode, struct file *file)
3045{
3c40090a
DL		 3046 return seq_open_net(inode, file, &if6_seq_ops,
3047 sizeof(struct if6_iter_state));
1da177e4
LT		 3048}
3049
9a32144e 3050static const struct file_operations if6_fops = {
1da177e4
LT		 3051 .owner = THIS_MODULE,
3052 .open = if6_seq_open,
3053 .read = seq_read,
3054 .llseek = seq_lseek,
3c40090a 3055 .release = seq_release_net,
1da177e4
LT		 3056};
3057
2c8c1e72 3058static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3059{
3c40090a 3060 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3061 return -ENOMEM;
3062 return 0;
3063}
3064
2c8c1e72 3065static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3066{
3067 proc_net_remove(net, "if_inet6");
3068}
3069
3070static struct pernet_operations if6_proc_net_ops = {
3071 .init = if6_proc_net_init,
3072 .exit = if6_proc_net_exit,
3073};
3074
3075int __init if6_proc_init(void)
3076{
3077 return register_pernet_subsys(&if6_proc_net_ops);
3078}
3079
1da177e4
LT		 3080void if6_proc_exit(void)
3081{
3c40090a 3082 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3083}
3084#endif /* CONFIG_PROC_FS */
3085
59fbb3a6 3086#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3087/* Check if address is a home address configured on any interface. */
389f6612 3088int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3089{
3090 int ret = 0;
c2e21293 3091 struct inet6_ifaddr *ifp = NULL;
3092 struct hlist_node *n;
3a88a81d 3093 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3094
5c578aed 3095 rcu_read_lock_bh();
4f70ecca 3096 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3097 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3098 continue;
caad295f 3099 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3100 (ifp->flags & IFA_F_HOMEADDRESS)) {
3101 ret = 1;
3102 break;
3103 }
3104 }
5c578aed 3105 rcu_read_unlock_bh();
3b9f9a1c
NT		 3106 return ret;
3107}
3108#endif
3109
1da177e4
LT		 3110/*
3111 * Periodic address status verification
3112 */
3113
3114static void addrconf_verify(unsigned long foo)
3115{
b2db7564 3116 unsigned long now, next, next_sec, next_sched;
1da177e4 3117 struct inet6_ifaddr *ifp;
c2e21293 3118 struct hlist_node *node;
1da177e4
LT		 3119 int i;
3120
5c578aed 3121 rcu_read_lock_bh();
3122 spin_lock(&addrconf_verify_lock);
1da177e4 3123 now = jiffies;
b2db7564 3124 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3125
3126 del_timer(&addr_chk_timer);
3127
bcdd553f 3128 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3129restart:
4f70ecca 3130 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3131 &inet6_addr_lst[i], addr_lst) {
1da177e4 3132 unsigned long age;
1da177e4
LT		 3133
3134 if (ifp->flags & IFA_F_PERMANENT)
3135 continue;
3136
3137 spin_lock(&ifp->lock);
b2db7564
YH		 3138 /* We try to batch several events at once. */
3139 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3140
8f27ebb9
YH		 3141 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3142 age >= ifp->valid_lft) {
1da177e4
LT		 3143 spin_unlock(&ifp->lock);
3144 in6_ifa_hold(ifp);
1da177e4
LT		 3145 ipv6_del_addr(ifp);
3146 goto restart;
8f27ebb9
YH		 3147 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3148 spin_unlock(&ifp->lock);
3149 continue;
1da177e4 3150 } else if (age >= ifp->prefered_lft) {
a1ed0526 3151 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3152 int deprecate = 0;
3153
3154 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3155 deprecate = 1;
3156 ifp->flags |= IFA_F_DEPRECATED;
3157 }
3158
3159 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3160 next = ifp->tstamp + ifp->valid_lft * HZ;
3161
3162 spin_unlock(&ifp->lock);
3163
3164 if (deprecate) {
3165 in6_ifa_hold(ifp);
1da177e4
LT		 3166
3167 ipv6_ifa_notify(0, ifp);
3168 in6_ifa_put(ifp);
3169 goto restart;
3170 }
3171#ifdef CONFIG_IPV6_PRIVACY
3172 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3173 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3174 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3175 ifp->idev->cnf.dad_transmits *
3176 ifp->idev->nd_parms->retrans_time / HZ;
3177
1da177e4
LT		 3178 if (age >= ifp->prefered_lft - regen_advance) {
3179 struct inet6_ifaddr *ifpub = ifp->ifpub;
3180 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3181 next = ifp->tstamp + ifp->prefered_lft * HZ;
3182 if (!ifp->regen_count && ifpub) {
3183 ifp->regen_count++;
3184 in6_ifa_hold(ifp);
3185 in6_ifa_hold(ifpub);
3186 spin_unlock(&ifp->lock);
5c578aed 3187
291d809b
HY		 3188 spin_lock(&ifpub->lock);
3189 ifpub->regen_count = 0;
3190 spin_unlock(&ifpub->lock);
1da177e4
LT		 3191 ipv6_create_tempaddr(ifpub, ifp);
3192 in6_ifa_put(ifpub);
3193 in6_ifa_put(ifp);
3194 goto restart;
3195 }
3196 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3197 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3198 spin_unlock(&ifp->lock);
3199#endif
3200 } else {
3201 /* ifp->prefered_lft <= ifp->valid_lft */
3202 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3203 next = ifp->tstamp + ifp->prefered_lft * HZ;
3204 spin_unlock(&ifp->lock);
3205 }
3206 }
1da177e4
LT		 3207 }
3208
b2db7564
YH		 3209 next_sec = round_jiffies_up(next);
3210 next_sched = next;
3211
3212 /* If rounded timeout is accurate enough, accept it. */
3213 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3214 next_sched = next_sec;
3215
3216 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3217 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3218 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3219
3220 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3221 now, next, next_sec, next_sched));
3222
3223 addr_chk_timer.expires = next_sched;
1da177e4 3224 add_timer(&addr_chk_timer);
5c578aed 3225 spin_unlock(&addrconf_verify_lock);
3226 rcu_read_unlock_bh();
1da177e4
LT		 3227}
3228
461d8837
TG		 3229static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3230{
3231 struct in6_addr *pfx = NULL;
3232
3233 if (addr)
3234 pfx = nla_data(addr);
3235
3236 if (local) {
3237 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3238 pfx = NULL;
3239 else
3240 pfx = nla_data(local);
3241 }
3242
3243 return pfx;
3244}
3245
ef7c79ed 3246static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3247 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3248 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3249 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3250};
3251
1da177e4
LT		 3252static int
3253inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3254{
3b1e0a65 3255 struct net *net = sock_net(skb->sk);
b933f716
TG		 3256 struct ifaddrmsg *ifm;
3257 struct nlattr *tb[IFA_MAX+1];
1da177e4 3258 struct in6_addr *pfx;
b933f716 3259 int err;
1da177e4 3260
b933f716
TG		 3261 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3262 if (err < 0)
3263 return err;
3264
3265 ifm = nlmsg_data(nlh);
3266 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3267 if (pfx == NULL)
3268 return -EINVAL;
3269
af284937 3270 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3271}
3272
55ebaef1
NT		 3273static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3274 u32 prefered_lft, u32 valid_lft)
081bba5b 3275{
6f704992
YH		 3276 u32 flags;
3277 clock_t expires;
4bed72e4 3278 unsigned long timeout;
46d48046 3279
081bba5b
NT		 3280 if (!valid_lft || (prefered_lft > valid_lft))
3281 return -EINVAL;
3282
4bed72e4
YH		 3283 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3284 if (addrconf_finite_timeout(timeout)) {
3285 expires = jiffies_to_clock_t(timeout * HZ);
3286 valid_lft = timeout;
6f704992 3287 flags = RTF_EXPIRES;
4bed72e4
YH		 3288 } else {
3289 expires = 0;
3290 flags = 0;
3291 ifa_flags |= IFA_F_PERMANENT;
6f704992 3292 }
081bba5b 3293
4bed72e4
YH		 3294 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3295 if (addrconf_finite_timeout(timeout)) {
3296 if (timeout == 0)
3297 ifa_flags |= IFA_F_DEPRECATED;
3298 prefered_lft = timeout;
3299 }
081bba5b
NT		 3300
3301 spin_lock_bh(&ifp->lock);
3b9f9a1c 3302 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3303 ifp->tstamp = jiffies;
3304 ifp->valid_lft = valid_lft;
3305 ifp->prefered_lft = prefered_lft;
3306
3307 spin_unlock_bh(&ifp->lock);
3308 if (!(ifp->flags&IFA_F_TENTATIVE))
3309 ipv6_ifa_notify(0, ifp);
081bba5b 3310
46d48046 3311 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3312 expires, flags);
081bba5b
NT		 3313 addrconf_verify(0);
3314
3315 return 0;
3316}
3317
1da177e4
LT		 3318static int
3319inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3320{
3b1e0a65 3321 struct net *net = sock_net(skb->sk);
461d8837
TG		 3322 struct ifaddrmsg *ifm;
3323 struct nlattr *tb[IFA_MAX+1];
1da177e4 3324 struct in6_addr *pfx;
7198f8ce
TG		 3325 struct inet6_ifaddr *ifa;
3326 struct net_device *dev;
55ebaef1
NT		 3327 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3328 u8 ifa_flags;
461d8837 3329 int err;
1da177e4 3330
461d8837
TG		 3331 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3332 if (err < 0)
3333 return err;
3334
3335 ifm = nlmsg_data(nlh);
3336 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3337 if (pfx == NULL)
3338 return -EINVAL;
3339
461d8837 3340 if (tb[IFA_CACHEINFO]) {
0778769d 3341 struct ifa_cacheinfo *ci;
461d8837
TG		 3342
3343 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3344 valid_lft = ci->ifa_valid;
461d8837
TG		 3345 preferred_lft = ci->ifa_prefered;
3346 } else {
3347 preferred_lft = INFINITY_LIFE_TIME;
3348 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3349 }
3350
af284937 3351 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3352 if (dev == NULL)
3353 return -ENODEV;
3354
55ebaef1 3355 /* We ignore other flags so far. */
3b9f9a1c 3356 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3357
1cab3da6 3358 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3359 if (ifa == NULL) {
3360 /*
3361 * It would be best to check for !NLM_F_CREATE here but
3362 * userspace alreay relies on not having to provide this.
3363 */
af284937
DL		 3364 return inet6_addr_add(net, ifm->ifa_index, pfx,
3365 ifm->ifa_prefixlen, ifa_flags,
3366 preferred_lft, valid_lft);
081bba5b
NT		 3367 }
3368
7198f8ce
TG		 3369 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3370 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3371 err = -EEXIST;
3372 else
55ebaef1 3373 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3374
3375 in6_ifa_put(ifa);
3376
3377 return err;
1da177e4
LT		 3378}
3379
101bb229
TG		 3380static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3381 u8 scope, int ifindex)
3382{
3383 struct ifaddrmsg *ifm;
3384
3385 ifm = nlmsg_data(nlh);
3386 ifm->ifa_family = AF_INET6;
3387 ifm->ifa_prefixlen = prefixlen;
3388 ifm->ifa_flags = flags;
3389 ifm->ifa_scope = scope;
3390 ifm->ifa_index = ifindex;
3391}
3392
85486af0
TG		 3393static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3394 unsigned long tstamp, u32 preferred, u32 valid)
3395{
3396 struct ifa_cacheinfo ci;
3397
3398 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3399 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3400 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3401 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3402 ci.ifa_prefered = preferred;
3403 ci.ifa_valid = valid;
3404
3405 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3406}
3407
101bb229
TG		 3408static inline int rt_scope(int ifa_scope)
3409{
3410 if (ifa_scope & IFA_HOST)
3411 return RT_SCOPE_HOST;
3412 else if (ifa_scope & IFA_LINK)
3413 return RT_SCOPE_LINK;
3414 else if (ifa_scope & IFA_SITE)
3415 return RT_SCOPE_SITE;
3416 else
3417 return RT_SCOPE_UNIVERSE;
3418}
3419
0ab6803b
TG		 3420static inline int inet6_ifaddr_msgsize(void)
3421{
339bf98f
TG		 3422 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3423 + nla_total_size(16) /* IFA_ADDRESS */
3424 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3425}
c5396a31 3426
1da177e4 3427static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3428 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3429{
1da177e4 3430 struct nlmsghdr *nlh;
85486af0 3431 u32 preferred, valid;
1da177e4 3432
0ab6803b
TG		 3433 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3434 if (nlh == NULL)
26932566 3435 return -EMSGSIZE;
0ab6803b 3436
101bb229
TG		 3437 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3438 ifa->idev->dev->ifindex);
3439
1da177e4 3440 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3441 preferred = ifa->prefered_lft;
3442 valid = ifa->valid_lft;
3443 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3444 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3445 if (preferred > tval)
3446 preferred -= tval;
3447 else
3448 preferred = 0;
85486af0
TG		 3449 if (valid != INFINITY_LIFE_TIME)
3450 valid -= tval;
1da177e4
LT		 3451 }
3452 } else {
85486af0
TG		 3453 preferred = INFINITY_LIFE_TIME;
3454 valid = INFINITY_LIFE_TIME;
3455 }
3456
0ab6803b 3457 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3458 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3459 nlmsg_cancel(skb, nlh);
3460 return -EMSGSIZE;
3461 }
1da177e4 3462
0ab6803b 3463 return nlmsg_end(skb, nlh);
1da177e4
LT		 3464}
3465
3466static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3467 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3468{
1da177e4 3469 struct nlmsghdr *nlh;
101bb229
TG		 3470 u8 scope = RT_SCOPE_UNIVERSE;
3471 int ifindex = ifmca->idev->dev->ifindex;
3472
3473 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3474 scope = RT_SCOPE_SITE;
1da177e4 3475
0ab6803b
TG		 3476 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3477 if (nlh == NULL)
26932566 3478 return -EMSGSIZE;
85486af0 3479
0ab6803b
TG		 3480 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3481 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3482 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3483 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3484 nlmsg_cancel(skb, nlh);
3485 return -EMSGSIZE;
3486 }
85486af0 3487
0ab6803b 3488 return nlmsg_end(skb, nlh);
1da177e4
LT		 3489}
3490
3491static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3492 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3493{
1da177e4 3494 struct nlmsghdr *nlh;
101bb229
TG		 3495 u8 scope = RT_SCOPE_UNIVERSE;
3496 int ifindex = ifaca->aca_idev->dev->ifindex;
3497
3498 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3499 scope = RT_SCOPE_SITE;
1da177e4 3500
0ab6803b
TG		 3501 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3502 if (nlh == NULL)
26932566 3503 return -EMSGSIZE;
85486af0 3504
0ab6803b
TG		 3505 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3506 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3507 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3508 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3509 nlmsg_cancel(skb, nlh);
3510 return -EMSGSIZE;
3511 }
1da177e4 3512
0ab6803b 3513 return nlmsg_end(skb, nlh);
1da177e4
LT		 3514}
3515
e21e8467 3516enum addr_type_t {
1da177e4
LT		 3517 UNICAST_ADDR,
3518 MULTICAST_ADDR,
3519 ANYCAST_ADDR,
3520};
3521
234b27c3
ED		 3522/* called with rcu_read_lock() */
3523static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3524 struct netlink_callback *cb, enum addr_type_t type,
3525 int s_ip_idx, int *p_ip_idx)
3526{
234b27c3
ED		 3527 struct ifmcaddr6 *ifmca;
3528 struct ifacaddr6 *ifaca;
3529 int err = 1;
3530 int ip_idx = *p_ip_idx;
3531
3532 read_lock_bh(&idev->lock);
3533 switch (type) {
502a2ffd 3534 case UNICAST_ADDR: {
3535 struct inet6_ifaddr *ifa;
3536
234b27c3 3537 /* unicast address incl. temp addr */
502a2ffd 3538 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3539 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3540 continue;
3541 err = inet6_fill_ifaddr(skb, ifa,
3542 NETLINK_CB(cb->skb).pid,
3543 cb->nlh->nlmsg_seq,
3544 RTM_NEWADDR,
3545 NLM_F_MULTI);
3546 if (err <= 0)
3547 break;
3548 }
3549 break;
502a2ffd 3550 }
234b27c3
ED		 3551 case MULTICAST_ADDR:
3552 /* multicast address */
3553 for (ifmca = idev->mc_list; ifmca;
3554 ifmca = ifmca->next, ip_idx++) {
3555 if (ip_idx < s_ip_idx)
3556 continue;
3557 err = inet6_fill_ifmcaddr(skb, ifmca,
3558 NETLINK_CB(cb->skb).pid,
3559 cb->nlh->nlmsg_seq,
3560 RTM_GETMULTICAST,
3561 NLM_F_MULTI);
3562 if (err <= 0)
3563 break;
3564 }
3565 break;
3566 case ANYCAST_ADDR:
3567 /* anycast address */
3568 for (ifaca = idev->ac_list; ifaca;
3569 ifaca = ifaca->aca_next, ip_idx++) {
3570 if (ip_idx < s_ip_idx)
3571 continue;
3572 err = inet6_fill_ifacaddr(skb, ifaca,
3573 NETLINK_CB(cb->skb).pid,
3574 cb->nlh->nlmsg_seq,
3575 RTM_GETANYCAST,
3576 NLM_F_MULTI);
3577 if (err <= 0)
3578 break;
3579 }
3580 break;
3581 default:
3582 break;
3583 }
3584 read_unlock_bh(&idev->lock);
3585 *p_ip_idx = ip_idx;
3586 return err;
3587}
3588
1da177e4
LT		 3589static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3590 enum addr_type_t type)
3591{
234b27c3
ED		 3592 struct net *net = sock_net(skb->sk);
3593 int h, s_h;
1da177e4
LT		 3594 int idx, ip_idx;
3595 int s_idx, s_ip_idx;
1da177e4 3596 struct net_device *dev;
234b27c3
ED		 3597 struct inet6_dev *idev;
3598 struct hlist_head *head;
3599 struct hlist_node *node;
1ab1457c 3600
234b27c3
ED		 3601 s_h = cb->args[0];
3602 s_idx = idx = cb->args[1];
3603 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3604
234b27c3
ED		 3605 rcu_read_lock();
3606 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3607 idx = 0;
3608 head = &net->dev_index_head[h];
3609 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3610 if (idx < s_idx)
3611 goto cont;
4b97efdf 3612 if (h > s_h || idx > s_idx)
234b27c3
ED		 3613 s_ip_idx = 0;
3614 ip_idx = 0;
e21e8467
SH		 3615 idev = __in6_dev_get(dev);
3616 if (!idev)
234b27c3
ED		 3617 goto cont;
3618
3619 if (in6_dump_addrs(idev, skb, cb, type,
3620 s_ip_idx, &ip_idx) <= 0)
3621 goto done;
7562f876 3622cont:
234b27c3
ED		 3623 idx++;
3624 }
1da177e4 3625 }
234b27c3
ED		 3626done:
3627 rcu_read_unlock();
3628 cb->args[0] = h;
3629 cb->args[1] = idx;
3630 cb->args[2] = ip_idx;
3631
1da177e4
LT		 3632 return skb->len;
3633}
3634
3635static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3636{
3637 enum addr_type_t type = UNICAST_ADDR;
b854272b 3638
1da177e4
LT		 3639 return inet6_dump_addr(skb, cb, type);
3640}
3641
3642static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3643{
3644 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3645
1da177e4
LT		 3646 return inet6_dump_addr(skb, cb, type);
3647}
3648
3649
3650static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3651{
3652 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3653
1da177e4
LT		 3654 return inet6_dump_addr(skb, cb, type);
3655}
3656
1b29fc2c
TG		 3657static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3658 void *arg)
6c223828 3659{
3b1e0a65 3660 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3661 struct ifaddrmsg *ifm;
3662 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3663 struct in6_addr *addr = NULL;
3664 struct net_device *dev = NULL;
3665 struct inet6_ifaddr *ifa;
3666 struct sk_buff *skb;
6c223828
NT		 3667 int err;
3668
1b29fc2c
TG		 3669 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3670 if (err < 0)
3671 goto errout;
3672
3673 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3674 if (addr == NULL) {
3675 err = -EINVAL;
3676 goto errout;
6c223828 3677 }
6c223828 3678
1b29fc2c 3679 ifm = nlmsg_data(nlh);
6c223828 3680 if (ifm->ifa_index)
6fda7350 3681 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3682
e21e8467
SH		 3683 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3684 if (!ifa) {
1b29fc2c
TG		 3685 err = -EADDRNOTAVAIL;
3686 goto errout;
3687 }
6c223828 3688
e21e8467
SH		 3689 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3690 if (!skb) {
6c223828 3691 err = -ENOBUFS;
1b29fc2c 3692 goto errout_ifa;
6c223828
NT		 3693 }
3694
6c223828
NT		 3695 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3696 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3697 if (err < 0) {
3698 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3699 WARN_ON(err == -EMSGSIZE);
3700 kfree_skb(skb);
3701 goto errout_ifa;
3702 }
6fda7350 3703 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3704errout_ifa:
6c223828 3705 in6_ifa_put(ifa);
1b29fc2c 3706errout:
6c223828 3707 return err;
6c223828
NT		 3708}
3709
1da177e4
LT		 3710static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3711{
3712 struct sk_buff *skb;
c346dca1 3713 struct net *net = dev_net(ifa->idev->dev);
5d620266 3714 int err = -ENOBUFS;
1da177e4 3715
0ab6803b 3716 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3717 if (skb == NULL)
3718 goto errout;
3719
3720 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3721 if (err < 0) {
3722 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3723 WARN_ON(err == -EMSGSIZE);
3724 kfree_skb(skb);
3725 goto errout;
3726 }
1ce85fe4
PNA		 3727 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3728 return;
5d620266
TG		 3729errout:
3730 if (err < 0)
6fda7350 3731 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3732}
3733
b6f99a21 3734static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3735 __s32 *array, int bytes)
3736{
04561c1f
TG		 3737 BUG_ON(bytes < (DEVCONF_MAX * 4));
3738
1da177e4
LT		 3739 memset(array, 0, bytes);
3740 array[DEVCONF_FORWARDING] = cnf->forwarding;
3741 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3742 array[DEVCONF_MTU6] = cnf->mtu6;
3743 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3744 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3745 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3746 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3747 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3748 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3749 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3750 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3751#ifdef CONFIG_IPV6_PRIVACY
3752 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3753 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3754 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3755 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3756 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3757#endif
3758 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3759 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3760 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3761#ifdef CONFIG_IPV6_ROUTER_PREF
3762 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3763 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3764#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3765 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3766#endif
930d6ff2 3767#endif
fbea49e1 3768 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3769 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3770#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3771 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3772#endif
7bc570c8
YH		 3773#ifdef CONFIG_IPV6_MROUTE
3774 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3775#endif
778d80be 3776 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3777 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3778 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3779}
3780
339bf98f
TG		 3781static inline size_t inet6_if_nlmsg_size(void)
3782{
3783 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3784 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3785 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3786 + nla_total_size(4) /* IFLA_MTU */
3787 + nla_total_size(4) /* IFLA_LINK */
3788 + nla_total_size( /* IFLA_PROTINFO */
3789 nla_total_size(4) /* IFLA_INET6_FLAGS */
3790 + nla_total_size(sizeof(struct ifla_cacheinfo))
3791 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3792 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3793 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3794 );
3795}
c5396a31 3796
7d720c3e
TH		 3797static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3798 int items, int bytes)
7f7d9a6b
HX		 3799{
3800 int i;
3801 int pad = bytes - sizeof(u64) * items;
3802 BUG_ON(pad < 0);
3803
3804 /* Use put_unaligned() because stats may not be aligned for u64. */
3805 put_unaligned(items, &stats[0]);
3806 for (i = 1; i < items; i++)
3807 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3808
3809 memset(&stats[items], 0, pad);
3810}
3811
3812static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3813 int bytes)
3814{
e21e8467 3815 switch (attrtype) {
7f7d9a6b 3816 case IFLA_INET6_STATS:
7d720c3e 3817 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3818 break;
3819 case IFLA_INET6_ICMP6STATS:
7d720c3e 3820 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3821 break;
3822 }
3823}
3824
1ab1457c 3825static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3826 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3827{
04561c1f 3828 struct net_device *dev = idev->dev;
bf99f1bd 3829 struct nlattr *nla;
04561c1f
TG		 3830 struct ifinfomsg *hdr;
3831 struct nlmsghdr *nlh;
3832 void *protoinfo;
3833 struct ifla_cacheinfo ci;
3834
3835 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3836 if (nlh == NULL)
26932566 3837 return -EMSGSIZE;
04561c1f
TG		 3838
3839 hdr = nlmsg_data(nlh);
3840 hdr->ifi_family = AF_INET6;
3841 hdr->__ifi_pad = 0;
3842 hdr->ifi_type = dev->type;
3843 hdr->ifi_index = dev->ifindex;
3844 hdr->ifi_flags = dev_get_flags(dev);
3845 hdr->ifi_change = 0;
3846
3847 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3848
3849 if (dev->addr_len)
04561c1f 3850 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3851
04561c1f 3852 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3853 if (dev->ifindex != dev->iflink)
04561c1f 3854 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3855
04561c1f
TG		 3856 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3857 if (protoinfo == NULL)
3858 goto nla_put_failure;
1da177e4 3859
04561c1f 3860 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3861
1da177e4
LT		 3862 ci.max_reasm_len = IPV6_MAXPLEN;
3863 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3864 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3865 ci.reachable_time = idev->nd_parms->reachable_time;
3866 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3867 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3868
bf99f1bd
YH		 3869 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3870 if (nla == NULL)
04561c1f 3871 goto nla_put_failure;
bf99f1bd 3872 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3873
bf99f1bd
YH		 3874 /* XXX - MC not implemented */
3875
3876 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3877 if (nla == NULL)
3878 goto nla_put_failure;
3879 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3880
3881 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3882 if (nla == NULL)
3883 goto nla_put_failure;
3884 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3885
04561c1f
TG		 3886 nla_nest_end(skb, protoinfo);
3887 return nlmsg_end(skb, nlh);
1da177e4 3888
04561c1f 3889nla_put_failure:
26932566
PM		 3890 nlmsg_cancel(skb, nlh);
3891 return -EMSGSIZE;
1da177e4
LT		 3892}
3893
3894static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3895{
3b1e0a65 3896 struct net *net = sock_net(skb->sk);
84d2697d 3897 int h, s_h;
434a8a58 3898 int idx = 0, s_idx;
1da177e4
LT		 3899 struct net_device *dev;
3900 struct inet6_dev *idev;
84d2697d
ED		 3901 struct hlist_head *head;
3902 struct hlist_node *node;
1da177e4 3903
84d2697d
ED		 3904 s_h = cb->args[0];
3905 s_idx = cb->args[1];
3906
3907 rcu_read_lock();
3908 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3909 idx = 0;
3910 head = &net->dev_index_head[h];
3911 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3912 if (idx < s_idx)
3913 goto cont;
3914 idev = __in6_dev_get(dev);
3915 if (!idev)
3916 goto cont;
3917 if (inet6_fill_ifinfo(skb, idev,
3918 NETLINK_CB(cb->skb).pid,
3919 cb->nlh->nlmsg_seq,
3920 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3921 goto out;
7562f876 3922cont:
84d2697d
ED		 3923 idx++;
3924 }
1da177e4 3925 }
84d2697d
ED		 3926out:
3927 rcu_read_unlock();
3928 cb->args[1] = idx;
3929 cb->args[0] = h;
1da177e4
LT		 3930
3931 return skb->len;
3932}
3933
3934void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3935{
3936 struct sk_buff *skb;
c346dca1 3937 struct net *net = dev_net(idev->dev);
8d7a76c9 3938 int err = -ENOBUFS;
1ab1457c 3939
339bf98f 3940 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3941 if (skb == NULL)
3942 goto errout;
3943
3944 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3945 if (err < 0) {
3946 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3947 WARN_ON(err == -EMSGSIZE);
3948 kfree_skb(skb);
3949 goto errout;
3950 }
1ce85fe4
PNA		 3951 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3952 return;
8d7a76c9
TG		 3953errout:
3954 if (err < 0)
6fda7350 3955 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3956}
3957
339bf98f
TG		 3958static inline size_t inet6_prefix_nlmsg_size(void)
3959{
3960 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3961 + nla_total_size(sizeof(struct in6_addr))
3962 + nla_total_size(sizeof(struct prefix_cacheinfo));
3963}
c5396a31 3964
1da177e4 3965static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3966 struct prefix_info *pinfo, u32 pid, u32 seq,
3967 int event, unsigned int flags)
1da177e4 3968{
6051e2f4
TG		 3969 struct prefixmsg *pmsg;
3970 struct nlmsghdr *nlh;
1da177e4
LT		 3971 struct prefix_cacheinfo ci;
3972
6051e2f4
TG		 3973 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3974 if (nlh == NULL)
26932566 3975 return -EMSGSIZE;
6051e2f4
TG		 3976
3977 pmsg = nlmsg_data(nlh);
1da177e4 3978 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3979 pmsg->prefix_pad1 = 0;
3980 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3981 pmsg->prefix_ifindex = idev->dev->ifindex;
3982 pmsg->prefix_len = pinfo->prefix_len;
3983 pmsg->prefix_type = pinfo->type;
8a47077a 3984 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3985 pmsg->prefix_flags = 0;
3986 if (pinfo->onlink)
3987 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3988 if (pinfo->autoconf)
3989 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3990
6051e2f4 3991 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3992
3993 ci.preferred_time = ntohl(pinfo->prefered);
3994 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3995 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3996
6051e2f4 3997 return nlmsg_end(skb, nlh);
1da177e4 3998
6051e2f4 3999nla_put_failure:
26932566
PM		 4000 nlmsg_cancel(skb, nlh);
4001 return -EMSGSIZE;
1da177e4
LT		 4002}
4003
1ab1457c 4004static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4005 struct prefix_info *pinfo)
4006{
4007 struct sk_buff *skb;
c346dca1 4008 struct net *net = dev_net(idev->dev);
8c384bfa 4009 int err = -ENOBUFS;
1da177e4 4010
339bf98f 4011 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4012 if (skb == NULL)
4013 goto errout;
4014
4015 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4016 if (err < 0) {
4017 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4018 WARN_ON(err == -EMSGSIZE);
4019 kfree_skb(skb);
4020 goto errout;
4021 }
1ce85fe4
PNA		 4022 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4023 return;
8c384bfa
TG		 4024errout:
4025 if (err < 0)
6fda7350 4026 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4027}
4028
1da177e4
LT		 4029static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4030{
4031 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4032
4033 switch (event) {
4034 case RTM_NEWADDR:
95c385b4
NH		 4035 /*
4036 * If the address was optimistic
4037 * we inserted the route at the start of
4038 * our DAD process, so we don't need
4039 * to do it again
4040 */
4041 if (!(ifp->rt->rt6i_node))
4042 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4043 if (ifp->idev->cnf.forwarding)
4044 addrconf_join_anycast(ifp);
4045 break;
4046 case RTM_DELADDR:
4047 if (ifp->idev->cnf.forwarding)
4048 addrconf_leave_anycast(ifp);
4049 addrconf_leave_solict(ifp->idev, &ifp->addr);
4050 dst_hold(&ifp->rt->u.dst);
93fa159a 4051
4052 if (ifp->dead && ip6_del_rt(ifp->rt))
1da177e4 4053 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4054 break;
4055 }
4056}
4057
4058static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4059{
8814c4b5 4060 rcu_read_lock_bh();
1da177e4
LT		 4061 if (likely(ifp->idev->dead == 0))
4062 __ipv6_ifa_notify(event, ifp);
8814c4b5 4063 rcu_read_unlock_bh();
1da177e4
LT		 4064}
4065
4066#ifdef CONFIG_SYSCTL
4067
4068static
8d65af78 4069int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4070 void __user *buffer, size_t *lenp, loff_t *ppos)
4071{
4072 int *valp = ctl->data;
4073 int val = *valp;
88af182e 4074 loff_t pos = *ppos;
1da177e4
LT		 4075 int ret;
4076
8d65af78 4077 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4078
c8fecf22 4079 if (write)
b325fddb 4080 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4081 if (ret)
4082 *ppos = pos;
1ab1457c 4083 return ret;
1da177e4
LT		 4084}
4085
56d417b1
BH		 4086static void dev_disable_change(struct inet6_dev *idev)
4087{
4088 if (!idev || !idev->dev)
4089 return;
4090
4091 if (idev->cnf.disable_ipv6)
4092 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4093 else
4094 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4095}
4096
4097static void addrconf_disable_change(struct net *net, __s32 newf)
4098{
4099 struct net_device *dev;
4100 struct inet6_dev *idev;
4101
c6d14c84
ED		 4102 rcu_read_lock();
4103 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4104 idev = __in6_dev_get(dev);
4105 if (idev) {
4106 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4107 idev->cnf.disable_ipv6 = newf;
4108 if (changed)
4109 dev_disable_change(idev);
4110 }
56d417b1 4111 }
c6d14c84 4112 rcu_read_unlock();
56d417b1
BH		 4113}
4114
4115static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4116{
4117 struct net *net;
4118
4119 net = (struct net *)table->extra2;
4120
4121 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4122 return 0;
4123
88af182e
EB		 4124 if (!rtnl_trylock()) {
4125 /* Restore the original values before restarting */
4126 *p = old;
56d417b1 4127 return restart_syscall();
88af182e 4128 }
56d417b1
BH		 4129
4130 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4131 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4132 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4133 addrconf_disable_change(net, newf);
4134 } else if ((!*p) ^ (!old))
4135 dev_disable_change((struct inet6_dev *)table->extra1);
4136
4137 rtnl_unlock();
4138 return 0;
4139}
4140
4141static
8d65af78 4142int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4143 void __user *buffer, size_t *lenp, loff_t *ppos)
4144{
4145 int *valp = ctl->data;
4146 int val = *valp;
88af182e 4147 loff_t pos = *ppos;
56d417b1
BH		 4148 int ret;
4149
8d65af78 4150 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4151
4152 if (write)
4153 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4154 if (ret)
4155 *ppos = pos;
56d417b1
BH		 4156 return ret;
4157}
4158
1da177e4
LT		 4159static struct addrconf_sysctl_table
4160{
4161 struct ctl_table_header *sysctl_header;
f6a07b29 4162 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4163 char *dev_name;
ab32ea5d 4164} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4165 .sysctl_header = NULL,
4166 .addrconf_vars = {
1ab1457c 4167 {
e21e8467
SH		 4168 .procname = "forwarding",
4169 .data = &ipv6_devconf.forwarding,
4170 .maxlen = sizeof(int),
4171 .mode = 0644,
4172 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4173 },
4174 {
e21e8467
SH		 4175 .procname = "hop_limit",
4176 .data = &ipv6_devconf.hop_limit,
4177 .maxlen = sizeof(int),
4178 .mode = 0644,
4179 .proc_handler = proc_dointvec,
1da177e4
LT		 4180 },
4181 {
e21e8467
SH		 4182 .procname = "mtu",
4183 .data = &ipv6_devconf.mtu6,
4184 .maxlen = sizeof(int),
4185 .mode = 0644,
4186 .proc_handler = proc_dointvec,
1da177e4
LT		 4187 },
4188 {
e21e8467
SH		 4189 .procname = "accept_ra",
4190 .data = &ipv6_devconf.accept_ra,
4191 .maxlen = sizeof(int),
4192 .mode = 0644,
4193 .proc_handler = proc_dointvec,
1da177e4
LT		 4194 },
4195 {
e21e8467
SH		 4196 .procname = "accept_redirects",
4197 .data = &ipv6_devconf.accept_redirects,
4198 .maxlen = sizeof(int),
4199 .mode = 0644,
4200 .proc_handler = proc_dointvec,
1da177e4
LT		 4201 },
4202 {
e21e8467
SH		 4203 .procname = "autoconf",
4204 .data = &ipv6_devconf.autoconf,
4205 .maxlen = sizeof(int),
4206 .mode = 0644,
4207 .proc_handler = proc_dointvec,
1da177e4
LT		 4208 },
4209 {
e21e8467
SH		 4210 .procname = "dad_transmits",
4211 .data = &ipv6_devconf.dad_transmits,
4212 .maxlen = sizeof(int),
4213 .mode = 0644,
4214 .proc_handler = proc_dointvec,
1da177e4
LT		 4215 },
4216 {
e21e8467
SH		 4217 .procname = "router_solicitations",
4218 .data = &ipv6_devconf.rtr_solicits,
4219 .maxlen = sizeof(int),
4220 .mode = 0644,
4221 .proc_handler = proc_dointvec,
1da177e4
LT		 4222 },
4223 {
e21e8467
SH		 4224 .procname = "router_solicitation_interval",
4225 .data = &ipv6_devconf.rtr_solicit_interval,
4226 .maxlen = sizeof(int),
4227 .mode = 0644,
4228 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4229 },
4230 {
e21e8467
SH		 4231 .procname = "router_solicitation_delay",
4232 .data = &ipv6_devconf.rtr_solicit_delay,
4233 .maxlen = sizeof(int),
4234 .mode = 0644,
4235 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4236 },
4237 {
e21e8467
SH		 4238 .procname = "force_mld_version",
4239 .data = &ipv6_devconf.force_mld_version,
4240 .maxlen = sizeof(int),
4241 .mode = 0644,
4242 .proc_handler = proc_dointvec,
1da177e4
LT		 4243 },
4244#ifdef CONFIG_IPV6_PRIVACY
4245 {
e21e8467
SH		 4246 .procname = "use_tempaddr",
4247 .data = &ipv6_devconf.use_tempaddr,
4248 .maxlen = sizeof(int),
4249 .mode = 0644,
4250 .proc_handler = proc_dointvec,
1da177e4
LT		 4251 },
4252 {
e21e8467
SH		 4253 .procname = "temp_valid_lft",
4254 .data = &ipv6_devconf.temp_valid_lft,
4255 .maxlen = sizeof(int),
4256 .mode = 0644,
4257 .proc_handler = proc_dointvec,
1da177e4
LT		 4258 },
4259 {
e21e8467
SH		 4260 .procname = "temp_prefered_lft",
4261 .data = &ipv6_devconf.temp_prefered_lft,
4262 .maxlen = sizeof(int),
4263 .mode = 0644,
4264 .proc_handler = proc_dointvec,
1da177e4
LT		 4265 },
4266 {
e21e8467
SH		 4267 .procname = "regen_max_retry",
4268 .data = &ipv6_devconf.regen_max_retry,
4269 .maxlen = sizeof(int),
4270 .mode = 0644,
4271 .proc_handler = proc_dointvec,
1da177e4
LT		 4272 },
4273 {
e21e8467
SH		 4274 .procname = "max_desync_factor",
4275 .data = &ipv6_devconf.max_desync_factor,
4276 .maxlen = sizeof(int),
4277 .mode = 0644,
4278 .proc_handler = proc_dointvec,
1da177e4
LT		 4279 },
4280#endif
4281 {
e21e8467
SH		 4282 .procname = "max_addresses",
4283 .data = &ipv6_devconf.max_addresses,
4284 .maxlen = sizeof(int),
4285 .mode = 0644,
4286 .proc_handler = proc_dointvec,
1da177e4 4287 },
65f5c7c1 4288 {
e21e8467
SH		 4289 .procname = "accept_ra_defrtr",
4290 .data = &ipv6_devconf.accept_ra_defrtr,
4291 .maxlen = sizeof(int),
4292 .mode = 0644,
4293 .proc_handler = proc_dointvec,
65f5c7c1 4294 },
c4fd30eb 4295 {
e21e8467
SH		 4296 .procname = "accept_ra_pinfo",
4297 .data = &ipv6_devconf.accept_ra_pinfo,
4298 .maxlen = sizeof(int),
4299 .mode = 0644,
4300 .proc_handler = proc_dointvec,
c4fd30eb 4301 },
930d6ff2
YH		 4302#ifdef CONFIG_IPV6_ROUTER_PREF
4303 {
e21e8467
SH		 4304 .procname = "accept_ra_rtr_pref",
4305 .data = &ipv6_devconf.accept_ra_rtr_pref,
4306 .maxlen = sizeof(int),
4307 .mode = 0644,
4308 .proc_handler = proc_dointvec,
930d6ff2 4309 },
52e16356 4310 {
e21e8467
SH		 4311 .procname = "router_probe_interval",
4312 .data = &ipv6_devconf.rtr_probe_interval,
4313 .maxlen = sizeof(int),
4314 .mode = 0644,
4315 .proc_handler = proc_dointvec_jiffies,
52e16356 4316 },
fa03ef38 4317#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4318 {
e21e8467
SH		 4319 .procname = "accept_ra_rt_info_max_plen",
4320 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4321 .maxlen = sizeof(int),
4322 .mode = 0644,
4323 .proc_handler = proc_dointvec,
09c884d4
YH		 4324 },
4325#endif
930d6ff2 4326#endif
fbea49e1 4327 {
e21e8467
SH		 4328 .procname = "proxy_ndp",
4329 .data = &ipv6_devconf.proxy_ndp,
4330 .maxlen = sizeof(int),
4331 .mode = 0644,
4332 .proc_handler = proc_dointvec,
fbea49e1 4333 },
0bcbc926 4334 {
e21e8467
SH		 4335 .procname = "accept_source_route",
4336 .data = &ipv6_devconf.accept_source_route,
4337 .maxlen = sizeof(int),
4338 .mode = 0644,
4339 .proc_handler = proc_dointvec,
0bcbc926 4340 },
95c385b4
NH		 4341#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4342 {
e21e8467
SH		 4343 .procname = "optimistic_dad",
4344 .data = &ipv6_devconf.optimistic_dad,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec,
95c385b4
NH		 4348
4349 },
7bc570c8
YH		 4350#endif
4351#ifdef CONFIG_IPV6_MROUTE
4352 {
e21e8467
SH		 4353 .procname = "mc_forwarding",
4354 .data = &ipv6_devconf.mc_forwarding,
4355 .maxlen = sizeof(int),
4356 .mode = 0444,
4357 .proc_handler = proc_dointvec,
7bc570c8 4358 },
95c385b4 4359#endif
778d80be 4360 {
e21e8467
SH		 4361 .procname = "disable_ipv6",
4362 .data = &ipv6_devconf.disable_ipv6,
4363 .maxlen = sizeof(int),
4364 .mode = 0644,
4365 .proc_handler = addrconf_sysctl_disable,
778d80be 4366 },
1b34be74 4367 {
e21e8467
SH		 4368 .procname = "accept_dad",
4369 .data = &ipv6_devconf.accept_dad,
4370 .maxlen = sizeof(int),
4371 .mode = 0644,
4372 .proc_handler = proc_dointvec,
1b34be74 4373 },
f7734fdf 4374 {
f7734fdf
OP		 4375 .procname = "force_tllao",
4376 .data = &ipv6_devconf.force_tllao,
4377 .maxlen = sizeof(int),
4378 .mode = 0644,
4379 .proc_handler = proc_dointvec
4380 },
1da177e4 4381 {
f8572d8f 4382 /* sentinel */
1da177e4
LT		 4383 }
4384 },
1da177e4
LT		 4385};
4386
bff16c2f 4387static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4388 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4389{
4390 int i;
1da177e4 4391 struct addrconf_sysctl_table *t;
1da177e4 4392
1dab6222
PE		 4393#define ADDRCONF_CTL_PATH_DEV 3
4394
4395 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4396 { .procname = "net", },
4397 { .procname = "ipv6", },
4398 { .procname = "conf", },
1dab6222
PE		 4399 { /* to be set */ },
4400 { },
4401 };
4402
4403
af879cc7 4404 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4405 if (t == NULL)
f68635e6
PE		 4406 goto out;
4407
bcdd553f 4408 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4409 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4410 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4411 t->addrconf_vars[i].extra2 = net;
1da177e4 4412 }
1da177e4 4413
1ab1457c
YH		 4414 /*
4415 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4416 * by sysctl and we wouldn't want anyone to change it under our feet
4417 * (see SIOCSIFNAME).
1ab1457c 4418 */
1dab6222
PE		 4419 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4420 if (!t->dev_name)
f68635e6 4421 goto free;
1da177e4 4422
1dab6222 4423 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4424
bff16c2f 4425 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4426 t->addrconf_vars);
1da177e4
LT		 4427 if (t->sysctl_header == NULL)
4428 goto free_procname;
f68635e6
PE		 4429
4430 p->sysctl = t;
95897312 4431 return 0;
1da177e4 4432
f68635e6 4433free_procname:
1dab6222 4434 kfree(t->dev_name);
f68635e6 4435free:
1da177e4 4436 kfree(t);
f68635e6 4437out:
95897312 4438 return -ENOBUFS;
1da177e4
LT		 4439}
4440
408c4768
PE		 4441static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4442{
4443 struct addrconf_sysctl_table *t;
4444
4445 if (p->sysctl == NULL)
4446 return;
4447
4448 t = p->sysctl;
4449 p->sysctl = NULL;
4450 unregister_sysctl_table(t->sysctl_header);
4451 kfree(t->dev_name);
4452 kfree(t);
4453}
4454
f52295a9
PE		 4455static void addrconf_sysctl_register(struct inet6_dev *idev)
4456{
54716e3b 4457 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4458 &ndisc_ifinfo_sysctl_change);
c346dca1 4459 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4460 idev, &idev->cnf);
f52295a9
PE		 4461}
4462
408c4768 4463static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4464{
408c4768
PE		 4465 __addrconf_sysctl_unregister(&idev->cnf);
4466 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4467}
4468
4469
4470#endif
4471
2c8c1e72 4472static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4473{
4474 int err;
4475 struct ipv6_devconf *all, *dflt;
4476
4477 err = -ENOMEM;
4478 all = &ipv6_devconf;
4479 dflt = &ipv6_devconf_dflt;
4480
09ad9bc7 4481 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4482 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4483 if (all == NULL)
4484 goto err_alloc_all;
4485
4486 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4487 if (dflt == NULL)
4488 goto err_alloc_dflt;
56d417b1
BH		 4489 } else {
4490 /* these will be inherited by all namespaces */
4491 dflt->autoconf = ipv6_defaults.autoconf;
4492 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4493 }
4494
4495 net->ipv6.devconf_all = all;
4496 net->ipv6.devconf_dflt = dflt;
4497
4498#ifdef CONFIG_SYSCTL
f8572d8f 4499 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4500 if (err < 0)
4501 goto err_reg_all;
4502
f8572d8f 4503 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4504 if (err < 0)
4505 goto err_reg_dflt;
4506#endif
4507 return 0;
4508
4509#ifdef CONFIG_SYSCTL
4510err_reg_dflt:
4511 __addrconf_sysctl_unregister(all);
4512err_reg_all:
4513 kfree(dflt);
4514#endif
4515err_alloc_dflt:
4516 kfree(all);
4517err_alloc_all:
4518 return err;
4519}
4520
2c8c1e72 4521static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4522{
4523#ifdef CONFIG_SYSCTL
4524 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4525 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4526#endif
09ad9bc7 4527 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4528 kfree(net->ipv6.devconf_dflt);
4529 kfree(net->ipv6.devconf_all);
4530 }
4531}
4532
4533static struct pernet_operations addrconf_ops = {
4534 .init = addrconf_init_net,
4535 .exit = addrconf_exit_net,
4536};
4537
1da177e4
LT		 4538/*
4539 * Device notifier
4540 */
4541
4542int register_inet6addr_notifier(struct notifier_block *nb)
4543{
1ab1457c 4544 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4545}
7159039a
YH		 4546EXPORT_SYMBOL(register_inet6addr_notifier);
4547
1da177e4
LT		 4548int unregister_inet6addr_notifier(struct notifier_block *nb)
4549{
e21e8467 4550 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4551}
7159039a
YH		 4552EXPORT_SYMBOL(unregister_inet6addr_notifier);
4553
1da177e4
LT		 4554/*
4555 * Init / cleanup code
4556 */
4557
4558int __init addrconf_init(void)
4559{
c2e21293 4560 int i, err;
2a8cc6c8 4561
e21e8467
SH		 4562 err = ipv6_addr_label_init();
4563 if (err < 0) {
4564 printk(KERN_CRIT "IPv6 Addrconf:"
4565 " cannot initialize default policy table: %d.\n", err);
2a8cc6c8
YH		 4566 return err;
4567 }
1da177e4 4568
e0da5a48
PE		 4569 register_pernet_subsys(&addrconf_ops);
4570
1da177e4
LT		 4571 /* The addrconf netdev notifier requires that loopback_dev
4572 * has it's ipv6 private information allocated and setup
4573 * before it can bring up and give link-local addresses
4574 * to other devices which are up.
4575 *
4576 * Unfortunately, loopback_dev is not necessarily the first
4577 * entry in the global dev_base list of net devices. In fact,
4578 * it is likely to be the very last entry on that list.
4579 * So this causes the notifier registry below to try and
4580 * give link-local addresses to all devices besides loopback_dev
4581 * first, then loopback_dev, which cases all the non-loopback_dev
4582 * devices to fail to get a link-local address.
4583 *
4584 * So, as a temporary fix, allocate the ipv6 structure for
4585 * loopback_dev first by hand.
4586 * Longer term, all of the dependencies ipv6 has upon the loopback
4587 * device and it being up should be removed.
4588 */
4589 rtnl_lock();
2774c7ab 4590 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4591 err = -ENOMEM;
4592 rtnl_unlock();
4593 if (err)
e0da5a48 4594 goto errlo;
1da177e4 4595
c2e21293 4596 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4597 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4598
1da177e4
LT		 4599 register_netdevice_notifier(&ipv6_dev_notf);
4600
1da177e4 4601 addrconf_verify(0);
c127ea2c
TG		 4602
4603 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4604 if (err < 0)
4605 goto errout;
4606
4607 /* Only the first call to __rtnl_register can fail */
4608 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4609 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4610 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4611 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4612 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4613
2a8cc6c8
YH		 4614 ipv6_addr_label_rtnl_register();
4615
1da177e4 4616 return 0;
c127ea2c
TG		 4617errout:
4618 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4619errlo:
4620 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4621
4622 return err;
1da177e4
LT		 4623}
4624
09f7709f 4625void addrconf_cleanup(void)
1da177e4 4626{
176c39af 4627 struct net_device *dev;
1da177e4
LT		 4628 int i;
4629
4630 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4631 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4632
4633 rtnl_lock();
4634
176c39af
DL		 4635 /* clean dev list */
4636 for_each_netdev(&init_net, dev) {
4637 if (__in6_dev_get(dev) == NULL)
4638 continue;
4639 addrconf_ifdown(dev, 1);
4640 }
4641 addrconf_ifdown(init_net.loopback_dev, 2);
4642
1da177e4
LT		 4643 /*
4644 * Check hash table.
4645 */
5c578aed 4646 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4647 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4648 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4649 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4650
4651 del_timer(&addr_chk_timer);
1da177e4 4652 rtnl_unlock();
1da177e4 4653}
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