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ipv6: Use POSTDAD state
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
1da177e4
LT		 9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
b1cacb68
YH		 36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
1da177e4
LT		 39 */
40
1da177e4
LT		 41#include <linux/errno.h>
42#include <linux/types.h>
a0bffffc 43#include <linux/kernel.h>
1da177e4
LT		 44#include <linux/socket.h>
45#include <linux/sockios.h>
1da177e4
LT		 46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
1823730f 49#include <linux/if_addr.h>
1da177e4
LT		 50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
5a0e3ad6 56#include <linux/slab.h>
1da177e4
LT		 57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
e21e8467 85#include <linux/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
e21e8467 101#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
1da177e4 102
b2db7564
YH		 103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
1da177e4 107#ifdef CONFIG_SYSCTL
f52295a9 108static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
1da177e4
LT		 118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 126#endif
127
1b34be74 128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
1da177e4
LT		 129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
c2e21293 134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
5c578aed 135static DEFINE_SPINLOCK(addrconf_hash_lock);
1da177e4 136
1da177e4
LT		 137static void addrconf_verify(unsigned long);
138
8d06afab 139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
93d9b7d7
JP		 145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
1da177e4
LT		 147static int addrconf_ifdown(struct net_device *dev, int how);
148
e431b8c0 149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 152static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
1ab1457c 157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 158 struct prefix_info *pinfo);
3e81c6da
DM		 159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
1da177e4 161
e041c683 162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 163
888c848e 164static struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 184 .accept_ra_defrtr = 1,
c4fd30eb 185 .accept_ra_pinfo = 1,
930d6ff2
YH		 186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
52e16356 188 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
930d6ff2 192#endif
fbea49e1 193 .proxy_ndp = 0,
0bcbc926 194 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 195 .disable_ipv6 = 0,
1b34be74 196 .accept_dad = 1,
1da177e4
LT		 197};
198
ab32ea5d 199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 218 .accept_ra_defrtr = 1,
c4fd30eb 219 .accept_ra_pinfo = 1,
930d6ff2
YH		 220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
52e16356 222 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
930d6ff2 226#endif
fbea49e1 227 .proxy_ndp = 0,
0bcbc926 228 .accept_source_route = 0, /* we do not accept RH0 by default. */
778d80be 229 .disable_ipv6 = 0,
1b34be74 230 .accept_dad = 1,
1da177e4
LT		 231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4 235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
f3ee4010
YH		 236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
1da177e4 238
f24e3d65 239/* Check if a valid qdisc is available */
05297949 240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
f24e3d65 241{
05297949 242 return !qdisc_tx_is_noop(dev);
f24e3d65
MC		 243}
244
2b5ead46
YH		 245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
1da177e4
LT		 251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
e21e8467 257enum addrconf_timer_t {
1da177e4
LT		 258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
e21e8467
SH		 277 default:
278 break;
1da177e4
LT		 279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
7f7d9a6b
HX		 284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
7d720c3e 286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
c69bce20 287 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b 288 goto err_ip;
7d720c3e 289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
c69bce20 290 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 291 goto err_icmp;
7d720c3e 292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
c69bce20 293 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 294 goto err_icmpmsg;
7f7d9a6b
HX		 295
296 return 0;
297
14878f75 298err_icmpmsg:
7d720c3e 299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
7f7d9a6b 300err_icmp:
7d720c3e 301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b 302err_ip:
aaf70ec7 303 return -ENOMEM;
7f7d9a6b
HX		 304}
305
16910b98 306static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 307{
7d720c3e
TH		 308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
7f7d9a6b
HX		 311}
312
1da177e4
LT		 313/* Nobody refers to this device, we may destroy it. */
314
8814c4b5
YH		 315static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316{
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319}
320
1da177e4
LT		 321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
547b792c 324
502a2ffd 325 WARN_ON(!list_empty(&idev->addr_list));
547b792c
IJ		 326 WARN_ON(idev->mc_list != NULL);
327
1da177e4
LT		 328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
e21e8467 333 pr_warning("Freeing alive inet6 device %p\n", idev);
1da177e4
LT		 334 return;
335 }
336 snmp6_free_dev(idev);
8814c4b5 337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 338}
339
7159039a
YH		 340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
1da177e4
LT		 342static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
1ab1457c 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 352
1ab1457c
YH		 353 if (ndev == NULL)
354 return NULL;
322f74a4
IO		 355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
502a2ffd 358 INIT_LIST_HEAD(&ndev->addr_list);
359
c346dca1 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
0187bdfb
BH		 368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
322f74a4
IO		 370 /* We refer to the device */
371 dev_hold(dev);
1da177e4 372
322f74a4
IO		 373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
0dc47877 376 __func__, dev->name));
322f74a4
IO		 377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
1da177e4 382
322f74a4
IO		 383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
0dc47877 386 __func__, dev->name));
322f74a4
IO		 387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
1da177e4 397
1b34be74
YH		 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
b077d7ab
YH		 401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
1da177e4 410#ifdef CONFIG_IPV6_PRIVACY
372e6c8f 411 INIT_LIST_HEAD(&ndev->tempaddr_list);
b24b8a24 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
9625ed72 415 dev->type == ARPHRD_TUNNEL6 ||
0be669bb 416 dev->type == ARPHRD_SIT ||
0be669bb 417 dev->type == ARPHRD_NONE) {
322f74a4
IO		 418 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
1da177e4
LT		 426#endif
427
f24e3d65 428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 429 ndev->if_flags |= IF_READY;
430
322f74a4
IO		 431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
f52295a9 433 addrconf_sysctl_register(ndev);
30c4cf57
DS		 434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 436
437 /* Join all-node multicast group */
f3ee4010 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
d88ae4cc 439
1da177e4
LT		 440 return ndev;
441}
442
cee89473 443static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
1da177e4
LT		 444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
e21e8467
SH		 449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
1da177e4
LT		 453 return NULL;
454 }
c5e33bdd 455
1da177e4
LT		 456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
1da177e4
LT		 466
467 if (!idev)
468 return;
469 dev = idev->dev;
0187bdfb
BH		 470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
1da177e4 472 if (dev && (dev->flags & IFF_MULTICAST)) {
1da177e4 473 if (idev->cnf.forwarding)
f3ee4010 474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
1da177e4 475 else
f3ee4010 476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
1da177e4 477 }
502a2ffd 478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
2c12a74c
MW		 480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
1da177e4
LT		 482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
e186932b 490static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
c6d14c84
ED		 495 rcu_read_lock();
496 for_each_netdev_rcu(net, dev) {
1da177e4
LT		 497 idev = __in6_dev_get(dev);
498 if (idev) {
e186932b
PE		 499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
1da177e4
LT		 501 if (changed)
502 dev_forward_change(idev);
503 }
1da177e4 504 }
c6d14c84 505 rcu_read_unlock();
1da177e4 506}
c8fecf22 507
b325fddb 508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
c8fecf22 509{
bff16c2f
PE		 510 struct net *net;
511
512 net = (struct net *)table->extra2;
441fc2a2 513 if (p == &net->ipv6.devconf_dflt->forwarding)
b325fddb
SH		 514 return 0;
515
88af182e
EB		 516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
5007392d 519 return restart_syscall();
88af182e 520 }
c8fecf22 521
e186932b
PE		 522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
c8fecf22
PE		 526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
0187bdfb 528 rtnl_unlock();
c8fecf22
PE		 529
530 if (*p)
7b4da532 531 rt6_purge_dflt_routers(net);
b325fddb 532 return 1;
c8fecf22 533}
1da177e4
LT		 534#endif
535
5c578aed 536static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537{
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540}
1da177e4 541
5c578aed 542/* Nobody refers to this ifaddr, destroy it */
1da177e4
LT		 543void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544{
c2e21293 545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
547b792c 546
1da177e4
LT		 547#ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549#endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
e21e8467 554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
1da177e4 555
e9d3e084 556 if (ifp->state != INET6_IFADDR_STATE_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);
e9d3e084 651 spin_lock_init(&ifa->state_lock);
1da177e4 652 init_timer(&ifa->timer);
c2e21293 653 INIT_HLIST_NODE(&ifa->addr_lst);
1da177e4
LT		 654 ifa->timer.data = (unsigned long) ifa;
655 ifa->scope = scope;
656 ifa->prefix_len = pfxlen;
657 ifa->flags = flags | IFA_F_TENTATIVE;
658 ifa->cstamp = ifa->tstamp = jiffies;
659
57f5f544
KF		 660 ifa->rt = rt;
661
95c385b4
NH		 662 /*
663 * part one of RFC 4429, section 3.3
664 * We should not configure an address as
665 * optimistic if we do not yet know the link
666 * layer address of our nexhop router
667 */
668
669 if (rt->rt6i_nexthop == NULL)
670 ifa->flags &= ~IFA_F_OPTIMISTIC;
671
1da177e4
LT		 672 ifa->idev = idev;
673 in6_dev_hold(idev);
674 /* For caller */
675 in6_ifa_hold(ifa);
676
677 /* Add to big hash table */
678 hash = ipv6_addr_hash(addr);
679
5c578aed 680 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
5c578aed 681 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 682
683 write_lock(&idev->lock);
684 /* Add to inet6_dev unicast addr list. */
e55ffac6 685 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 686
687#ifdef CONFIG_IPV6_PRIVACY
688 if (ifa->flags&IFA_F_TEMPORARY) {
372e6c8f 689 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1da177e4
LT		 690 in6_ifa_hold(ifa);
691 }
692#endif
693
1da177e4
LT		 694 in6_ifa_hold(ifa);
695 write_unlock(&idev->lock);
696out2:
8814c4b5 697 rcu_read_unlock_bh();
1da177e4 698
fd92833a 699 if (likely(err == 0))
e041c683 700 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 701 else {
702 kfree(ifa);
703 ifa = ERR_PTR(err);
704 }
705
706 return ifa;
707out:
5c578aed 708 spin_unlock(&addrconf_hash_lock);
1da177e4
LT		 709 goto out2;
710}
711
712/* This function wants to get referenced ifp and releases it before return */
713
714static void ipv6_del_addr(struct inet6_ifaddr *ifp)
715{
502a2ffd 716 struct inet6_ifaddr *ifa, *ifn;
1da177e4 717 struct inet6_dev *idev = ifp->idev;
4c5ff6a6 718 int state;
1da177e4
LT		 719 int hash;
720 int deleted = 0, onlink = 0;
721 unsigned long expires = jiffies;
722
723 hash = ipv6_addr_hash(&ifp->addr);
724
4c5ff6a6
HX		 725 spin_lock_bh(&ifp->state_lock);
726 state = ifp->state;
e9d3e084 727 ifp->state = INET6_IFADDR_STATE_DEAD;
4c5ff6a6
HX		 728 spin_unlock_bh(&ifp->state_lock);
729
730 if (state == INET6_IFADDR_STATE_DEAD)
731 goto out;
1da177e4 732
5c578aed 733 spin_lock_bh(&addrconf_hash_lock);
734 hlist_del_init_rcu(&ifp->addr_lst);
5c578aed 735 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 736
737 write_lock_bh(&idev->lock);
738#ifdef CONFIG_IPV6_PRIVACY
739 if (ifp->flags&IFA_F_TEMPORARY) {
372e6c8f 740 list_del(&ifp->tmp_list);
741 if (ifp->ifpub) {
742 in6_ifa_put(ifp->ifpub);
743 ifp->ifpub = NULL;
1da177e4 744 }
372e6c8f 745 __in6_ifa_put(ifp);
1da177e4
LT		 746 }
747#endif
748
502a2ffd 749 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
1da177e4 750 if (ifa == ifp) {
502a2ffd 751 list_del_init(&ifp->if_list);
1da177e4 752 __in6_ifa_put(ifp);
502a2ffd 753
1da177e4
LT		 754 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
755 break;
756 deleted = 1;
1d142804 757 continue;
1da177e4
LT		 758 } else if (ifp->flags & IFA_F_PERMANENT) {
759 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
760 ifp->prefix_len)) {
761 if (ifa->flags & IFA_F_PERMANENT) {
762 onlink = 1;
763 if (deleted)
764 break;
765 } else {
766 unsigned long lifetime;
767
768 if (!onlink)
769 onlink = -1;
770
771 spin_lock(&ifa->lock);
4bed72e4
YH		 772
773 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
774 /*
775 * Note: Because this address is
776 * not permanent, lifetime <
777 * LONG_MAX / HZ here.
778 */
1da177e4
LT		 779 if (time_before(expires,
780 ifa->tstamp + lifetime * HZ))
781 expires = ifa->tstamp + lifetime * HZ;
782 spin_unlock(&ifa->lock);
783 }
784 }
785 }
786 }
787 write_unlock_bh(&idev->lock);
788
b2238566
AV		 789 addrconf_del_timer(ifp);
790
1da177e4
LT		 791 ipv6_ifa_notify(RTM_DELADDR, ifp);
792
e041c683 793 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4 794
1da177e4
LT		 795 /*
796 * Purge or update corresponding prefix
797 *
798 * 1) we don't purge prefix here if address was not permanent.
799 * prefix is managed by its own lifetime.
800 * 2) if there're no addresses, delete prefix.
801 * 3) if there're still other permanent address(es),
802 * corresponding prefix is still permanent.
803 * 4) otherwise, update prefix lifetime to the
804 * longest valid lifetime among the corresponding
805 * addresses on the device.
806 * Note: subsequent RA will update lifetime.
807 *
808 * --yoshfuji
809 */
810 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
811 struct in6_addr prefix;
812 struct rt6_info *rt;
c346dca1 813 struct net *net = dev_net(ifp->idev->dev);
1da177e4 814 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
6fda7350 815 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
1da177e4 816
2b5ead46 817 if (rt && addrconf_is_prefix_route(rt)) {
1da177e4 818 if (onlink == 0) {
e0a1ad73 819 ip6_del_rt(rt);
1da177e4
LT		 820 rt = NULL;
821 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
822 rt->rt6i_expires = expires;
823 rt->rt6i_flags |= RTF_EXPIRES;
824 }
825 }
826 dst_release(&rt->u.dst);
827 }
828
4c5ff6a6 829out:
1da177e4
LT		 830 in6_ifa_put(ifp);
831}
832
833#ifdef CONFIG_IPV6_PRIVACY
834static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
835{
836 struct inet6_dev *idev = ifp->idev;
837 struct in6_addr addr, *tmpaddr;
838 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
eac55bf9 839 unsigned long regen_advance;
1da177e4
LT		 840 int tmp_plen;
841 int ret = 0;
842 int max_addresses;
95c385b4 843 u32 addr_flags;
1da177e4
LT		 844
845 write_lock(&idev->lock);
846 if (ift) {
847 spin_lock_bh(&ift->lock);
848 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
849 spin_unlock_bh(&ift->lock);
850 tmpaddr = &addr;
851 } else {
852 tmpaddr = NULL;
853 }
854retry:
855 in6_dev_hold(idev);
856 if (idev->cnf.use_tempaddr <= 0) {
857 write_unlock(&idev->lock);
858 printk(KERN_INFO
859 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 spin_lock_bh(&ifp->lock);
865 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
866 idev->cnf.use_tempaddr = -1; /*XXX*/
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 in6_dev_put(idev);
872 ret = -1;
873 goto out;
874 }
875 in6_ifa_hold(ifp);
876 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
877 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
878 spin_unlock_bh(&ifp->lock);
879 write_unlock(&idev->lock);
880 printk(KERN_WARNING
881 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 in6_ifa_put(ifp);
883 in6_dev_put(idev);
884 ret = -1;
885 goto out;
886 }
887 memcpy(&addr.s6_addr[8], idev->rndid, 8);
888 tmp_valid_lft = min_t(__u32,
889 ifp->valid_lft,
890 idev->cnf.temp_valid_lft);
1ab1457c
YH		 891 tmp_prefered_lft = min_t(__u32,
892 ifp->prefered_lft,
1da177e4
LT		 893 idev->cnf.temp_prefered_lft - desync_factor / HZ);
894 tmp_plen = ifp->prefix_len;
895 max_addresses = idev->cnf.max_addresses;
896 tmp_cstamp = ifp->cstamp;
897 tmp_tstamp = ifp->tstamp;
898 spin_unlock_bh(&ifp->lock);
899
eac55bf9
BB		 900 regen_advance = idev->cnf.regen_max_retry *
901 idev->cnf.dad_transmits *
902 idev->nd_parms->retrans_time / HZ;
1da177e4 903 write_unlock(&idev->lock);
95c385b4 904
eac55bf9
BB		 905 /* A temporary address is created only if this calculated Preferred
906 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
907 * an implementation must not create a temporary address with a zero
908 * Preferred Lifetime.
909 */
910 if (tmp_prefered_lft <= regen_advance) {
911 in6_ifa_put(ifp);
912 in6_dev_put(idev);
913 ret = -1;
914 goto out;
915 }
916
95c385b4
NH		 917 addr_flags = IFA_F_TEMPORARY;
918 /* set in addrconf_prefix_rcv() */
919 if (ifp->flags & IFA_F_OPTIMISTIC)
920 addr_flags |= IFA_F_OPTIMISTIC;
921
1da177e4 922 ift = !max_addresses ||
1ab1457c 923 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 924 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 925 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 addr_flags) : NULL;
1da177e4
LT		 927 if (!ift || IS_ERR(ift)) {
928 in6_ifa_put(ifp);
929 in6_dev_put(idev);
930 printk(KERN_INFO
931 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
932 tmpaddr = &addr;
933 write_lock(&idev->lock);
934 goto retry;
935 }
936
937 spin_lock_bh(&ift->lock);
938 ift->ifpub = ifp;
939 ift->valid_lft = tmp_valid_lft;
940 ift->prefered_lft = tmp_prefered_lft;
941 ift->cstamp = tmp_cstamp;
942 ift->tstamp = tmp_tstamp;
943 spin_unlock_bh(&ift->lock);
944
945 addrconf_dad_start(ift, 0);
946 in6_ifa_put(ift);
947 in6_dev_put(idev);
948out:
949 return ret;
950}
951#endif
952
953/*
072047e4 954 * Choose an appropriate source address (RFC3484)
1da177e4 955 */
a9b05723
YH		 956enum {
957 IPV6_SADDR_RULE_INIT = 0,
958 IPV6_SADDR_RULE_LOCAL,
959 IPV6_SADDR_RULE_SCOPE,
960 IPV6_SADDR_RULE_PREFERRED,
961#ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_HOA,
963#endif
964 IPV6_SADDR_RULE_OIF,
965 IPV6_SADDR_RULE_LABEL,
966#ifdef CONFIG_IPV6_PRIVACY
967 IPV6_SADDR_RULE_PRIVACY,
968#endif
969 IPV6_SADDR_RULE_ORCHID,
970 IPV6_SADDR_RULE_PREFIX,
971 IPV6_SADDR_RULE_MAX
972};
973
072047e4 974struct ipv6_saddr_score {
a9b05723
YH		 975 int rule;
976 int addr_type;
977 struct inet6_ifaddr *ifa;
978 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
979 int scopedist;
980 int matchlen;
072047e4
YH		 981};
982
a9b05723 983struct ipv6_saddr_dst {
9acd9f3a 984 const struct in6_addr *addr;
a9b05723
YH		 985 int ifindex;
986 int scope;
987 int label;
7cbca67c 988 unsigned int prefs;
a9b05723 989};
072047e4 990
b6f99a21 991static inline int ipv6_saddr_preferred(int type)
1da177e4 992{
45bb0060 993 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
072047e4
YH		 994 return 1;
995 return 0;
1da177e4
LT		 996}
997
3de23255
BT		 998static int ipv6_get_saddr_eval(struct net *net,
999 struct ipv6_saddr_score *score,
a9b05723
YH		 1000 struct ipv6_saddr_dst *dst,
1001 int i)
1002{
1003 int ret;
1004
1005 if (i <= score->rule) {
1006 switch (i) {
1007 case IPV6_SADDR_RULE_SCOPE:
1008 ret = score->scopedist;
1009 break;
1010 case IPV6_SADDR_RULE_PREFIX:
1011 ret = score->matchlen;
1012 break;
1013 default:
1014 ret = !!test_bit(i, score->scorebits);
1015 }
1016 goto out;
1017 }
1018
1019 switch (i) {
1020 case IPV6_SADDR_RULE_INIT:
1021 /* Rule 0: remember if hiscore is not ready yet */
1022 ret = !!score->ifa;
1023 break;
1024 case IPV6_SADDR_RULE_LOCAL:
1025 /* Rule 1: Prefer same address */
1026 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027 break;
1028 case IPV6_SADDR_RULE_SCOPE:
1029 /* Rule 2: Prefer appropriate scope
1030 *
1031 * ret
1032 * ^
1033 * -1 | d 15
1034 * ---+--+-+---> scope
1035 * |
1036 * | d is scope of the destination.
1037 * B-d | \
1038 * | \ <- smaller scope is better if
1039 * B-15 | \ if scope is enough for destinaion.
1040 * | ret = B - scope (-1 <= scope >= d <= 15).
1041 * d-C-1 | /
1042 * |/ <- greater is better
1043 * -C / if scope is not enough for destination.
1044 * /| ret = scope - C (-1 <= d < scope <= 15).
1045 *
1046 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048 * Assume B = 0 and we get C > 29.
1049 */
1050 ret = __ipv6_addr_src_scope(score->addr_type);
1051 if (ret >= dst->scope)
1052 ret = -ret;
1053 else
1054 ret -= 128; /* 30 is enough */
1055 score->scopedist = ret;
1056 break;
1057 case IPV6_SADDR_RULE_PREFERRED:
1058 /* Rule 3: Avoid deprecated and optimistic addresses */
1059 ret = ipv6_saddr_preferred(score->addr_type) ||
1060 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061 break;
1062#ifdef CONFIG_IPV6_MIP6
1063 case IPV6_SADDR_RULE_HOA:
7cbca67c 1064 {
a9b05723 1065 /* Rule 4: Prefer home address */
7cbca67c
YH		 1066 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
a9b05723 1068 break;
7cbca67c 1069 }
a9b05723
YH		 1070#endif
1071 case IPV6_SADDR_RULE_OIF:
1072 /* Rule 5: Prefer outgoing interface */
1073 ret = (!dst->ifindex ||
1074 dst->ifindex == score->ifa->idev->dev->ifindex);
1075 break;
1076 case IPV6_SADDR_RULE_LABEL:
1077 /* Rule 6: Prefer matching label */
3de23255
BT		 1078 ret = ipv6_addr_label(net,
1079 &score->ifa->addr, score->addr_type,
a9b05723
YH		 1080 score->ifa->idev->dev->ifindex) == dst->label;
1081 break;
1082#ifdef CONFIG_IPV6_PRIVACY
1083 case IPV6_SADDR_RULE_PRIVACY:
7cbca67c 1084 {
a9b05723
YH		 1085 /* Rule 7: Prefer public address
1086 * Note: prefer temprary address if use_tempaddr >= 2
1087 */
7cbca67c
YH		 1088 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090 score->ifa->idev->cnf.use_tempaddr >= 2;
1091 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
a9b05723 1092 break;
7cbca67c 1093 }
a9b05723
YH		 1094#endif
1095 case IPV6_SADDR_RULE_ORCHID:
1096 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097 * non-ORCHID vs non-ORCHID
1098 */
1099 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100 ipv6_addr_orchid(dst->addr));
1101 break;
1102 case IPV6_SADDR_RULE_PREFIX:
1103 /* Rule 8: Use longest matching prefix */
1104 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 dst->addr);
1106 break;
1107 default:
1108 ret = 0;
1109 }
1110
1111 if (ret)
1112 __set_bit(i, score->scorebits);
1113 score->rule = i;
1114out:
1115 return ret;
1116}
1117
191cd582 1118int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
9acd9f3a 1119 const struct in6_addr *daddr, unsigned int prefs,
7cbca67c 1120 struct in6_addr *saddr)
1da177e4 1121{
a9b05723
YH		 1122 struct ipv6_saddr_score scores[2],
1123 *score = &scores[0], *hiscore = &scores[1];
a9b05723 1124 struct ipv6_saddr_dst dst;
072047e4 1125 struct net_device *dev;
a9b05723 1126 int dst_type;
1da177e4 1127
a9b05723
YH		 1128 dst_type = __ipv6_addr_type(daddr);
1129 dst.addr = daddr;
1130 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131 dst.scope = __ipv6_addr_src_scope(dst_type);
3de23255 1132 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
7cbca67c 1133 dst.prefs = prefs;
a9b05723
YH		 1134
1135 hiscore->rule = -1;
1136 hiscore->ifa = NULL;
1da177e4 1137
8814c4b5 1138 rcu_read_lock();
1da177e4 1139
c6d14c84 1140 for_each_netdev_rcu(net, dev) {
072047e4 1141 struct inet6_dev *idev;
072047e4 1142
a9b05723 1143 /* Candidate Source Address (section 4)
072047e4
YH		 1144 * - multicast and link-local destination address,
1145 * the set of candidate source address MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same link as the outgoing
1148 * interface.
1149 * (- For site-local destination addresses, the
1150 * set of candidate source addresses MUST only
1151 * include addresses assigned to interfaces
1152 * belonging to the same site as the outgoing
1153 * interface.)
1154 */
a9b05723
YH		 1155 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1156 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1157 dst.ifindex && dev->ifindex != dst.ifindex)
072047e4 1158 continue;
1da177e4 1159
1da177e4 1160 idev = __in6_dev_get(dev);
072047e4
YH		 1161 if (!idev)
1162 continue;
1163
1164 read_lock_bh(&idev->lock);
502a2ffd 1165 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
a9b05723 1166 int i;
072047e4 1167
a9b05723 1168 /*
6b3ae80a
YH		 1169 * - Tentative Address (RFC2462 section 5.4)
1170 * - A tentative address is not considered
1171 * "assigned to an interface" in the traditional
95c385b4 1172 * sense, unless it is also flagged as optimistic.
6b3ae80a 1173 * - Candidate Source Address (section 4)
072047e4
YH		 1174 * - In any case, anycast addresses, multicast
1175 * addresses, and the unspecified address MUST
1176 * NOT be included in a candidate set.
1177 */
a9b05723
YH		 1178 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1179 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 1180 continue;
a9b05723
YH		 1181
1182 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1183
1184 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1185 score->addr_type & IPV6_ADDR_MULTICAST)) {
072047e4 1186 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 1187 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 1188 "assigned as unicast address on %s",
1189 dev->name);
1190 continue;
1191 }
1192
a9b05723
YH		 1193 score->rule = -1;
1194 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1195
1196 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1197 int minihiscore, miniscore;
1198
3de23255
BT		 1199 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1200 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
a9b05723
YH		 1201
1202 if (minihiscore > miniscore) {
1203 if (i == IPV6_SADDR_RULE_SCOPE &&
1204 score->scopedist > 0) {
1205 /*
1206 * special case:
1207 * each remaining entry
1208 * has too small (not enough)
1209 * scope, because ifa entries
1210 * are sorted by their scope
1211 * values.
1212 */
1213 goto try_nextdev;
1214 }
1215 break;
1216 } else if (minihiscore < miniscore) {
a9b05723
YH		 1217 if (hiscore->ifa)
1218 in6_ifa_put(hiscore->ifa);
1219
1220 in6_ifa_hold(score->ifa);
1221
a0bffffc 1222 swap(hiscore, score);
a9b05723
YH		 1223
1224 /* restore our iterator */
1225 score->ifa = hiscore->ifa;
1226
1227 break;
1da177e4 1228 }
072047e4 1229 }
1da177e4 1230 }
a9b05723 1231try_nextdev:
072047e4 1232 read_unlock_bh(&idev->lock);
1da177e4 1233 }
8814c4b5 1234 rcu_read_unlock();
1da177e4 1235
a9b05723 1236 if (!hiscore->ifa)
072047e4 1237 return -EADDRNOTAVAIL;
1ab1457c 1238
a9b05723
YH		 1239 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1240 in6_ifa_put(hiscore->ifa);
072047e4 1241 return 0;
1da177e4 1242}
5e5f3f0f 1243EXPORT_SYMBOL(ipv6_dev_get_saddr);
1da177e4 1244
95c385b4
NH		 1245int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1246 unsigned char banned_flags)
1da177e4
LT		 1247{
1248 struct inet6_dev *idev;
1249 int err = -EADDRNOTAVAIL;
1250
8814c4b5 1251 rcu_read_lock();
e21e8467
SH		 1252 idev = __in6_dev_get(dev);
1253 if (idev) {
1da177e4
LT		 1254 struct inet6_ifaddr *ifp;
1255
1256 read_lock_bh(&idev->lock);
502a2ffd 1257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1258 if (ifp->scope == IFA_LINK &&
1259 !(ifp->flags & banned_flags)) {
1da177e4
LT		 1260 ipv6_addr_copy(addr, &ifp->addr);
1261 err = 0;
1262 break;
1263 }
1264 }
1265 read_unlock_bh(&idev->lock);
1266 }
8814c4b5 1267 rcu_read_unlock();
1da177e4
LT		 1268 return err;
1269}
1270
1271static int ipv6_count_addresses(struct inet6_dev *idev)
1272{
1273 int cnt = 0;
1274 struct inet6_ifaddr *ifp;
1275
1276 read_lock_bh(&idev->lock);
502a2ffd 1277 list_for_each_entry(ifp, &idev->addr_list, if_list)
1da177e4
LT		 1278 cnt++;
1279 read_unlock_bh(&idev->lock);
1280 return cnt;
1281}
1282
bfeade08
DL		 1283int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1284 struct net_device *dev, int strict)
1da177e4 1285{
eedf042a 1286 struct inet6_ifaddr *ifp;
c2e21293 1287 struct hlist_node *node;
3a88a81d 1288 unsigned int hash = ipv6_addr_hash(addr);
1da177e4 1289
5c578aed 1290 rcu_read_lock_bh();
1291 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1292 if (!net_eq(dev_net(ifp->idev->dev), net))
bfeade08 1293 continue;
1da177e4 1294 if (ipv6_addr_equal(&ifp->addr, addr) &&
eedf042a
SH		 1295 !(ifp->flags&IFA_F_TENTATIVE) &&
1296 (dev == NULL || ifp->idev->dev == dev ||
1297 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1298 rcu_read_unlock_bh();
1299 return 1;
1da177e4
LT		 1300 }
1301 }
5c578aed 1302
eedf042a
SH		 1303 rcu_read_unlock_bh();
1304 return 0;
1da177e4 1305}
7159039a
YH		 1306EXPORT_SYMBOL(ipv6_chk_addr);
1307
3e81c6da
DM		 1308static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1309 struct net_device *dev)
1da177e4 1310{
3e81c6da 1311 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 1312 struct inet6_ifaddr *ifp;
1313 struct hlist_node *node;
1da177e4 1314
c2e21293 1315 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1316 if (!net_eq(dev_net(ifp->idev->dev), net))
06bfe655 1317 continue;
1da177e4
LT		 1318 if (ipv6_addr_equal(&ifp->addr, addr)) {
1319 if (dev == NULL || ifp->idev->dev == dev)
3e81c6da 1320 return true;
1da177e4
LT		 1321 }
1322 }
3e81c6da 1323 return false;
1da177e4
LT		 1324}
1325
52eeeb84
YH		 1326int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1327{
1328 struct inet6_dev *idev;
1329 struct inet6_ifaddr *ifa;
1330 int onlink;
1331
1332 onlink = 0;
1333 rcu_read_lock();
1334 idev = __in6_dev_get(dev);
1335 if (idev) {
1336 read_lock_bh(&idev->lock);
502a2ffd 1337 list_for_each_entry(ifa, &idev->addr_list, if_list) {
52eeeb84
YH		 1338 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1339 ifa->prefix_len);
1340 if (onlink)
1341 break;
1342 }
1343 read_unlock_bh(&idev->lock);
1344 }
1345 rcu_read_unlock();
1346 return onlink;
1347}
1348
1349EXPORT_SYMBOL(ipv6_chk_prefix);
1350
9acd9f3a 1351struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1cab3da6 1352 struct net_device *dev, int strict)
1da177e4 1353{
b79d1d54 1354 struct inet6_ifaddr *ifp, *result = NULL;
3a88a81d 1355 unsigned int hash = ipv6_addr_hash(addr);
b79d1d54 1356 struct hlist_node *node;
1da177e4 1357
5c578aed 1358 rcu_read_lock_bh();
4f70ecca 1359 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
878628fb 1360 if (!net_eq(dev_net(ifp->idev->dev), net))
1cab3da6 1361 continue;
1da177e4
LT		 1362 if (ipv6_addr_equal(&ifp->addr, addr)) {
1363 if (dev == NULL || ifp->idev->dev == dev ||
1364 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
b79d1d54 1365 result = ifp;
1da177e4
LT		 1366 in6_ifa_hold(ifp);
1367 break;
1368 }
1369 }
1370 }
5c578aed 1371 rcu_read_unlock_bh();
1da177e4 1372
b79d1d54 1373 return result;
1da177e4
LT		 1374}
1375
1da177e4
LT		 1376/* Gets referenced address, destroys ifaddr */
1377
cc411d0b 1378static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1da177e4 1379{
1da177e4
LT		 1380 if (ifp->flags&IFA_F_PERMANENT) {
1381 spin_lock_bh(&ifp->lock);
1382 addrconf_del_timer(ifp);
1383 ifp->flags |= IFA_F_TENTATIVE;
cc411d0b
BH		 1384 if (dad_failed)
1385 ifp->flags |= IFA_F_DADFAILED;
1da177e4 1386 spin_unlock_bh(&ifp->lock);
e2577a06
HX		 1387 if (dad_failed)
1388 ipv6_ifa_notify(0, ifp);
1da177e4
LT		 1389 in6_ifa_put(ifp);
1390#ifdef CONFIG_IPV6_PRIVACY
1391 } else if (ifp->flags&IFA_F_TEMPORARY) {
1392 struct inet6_ifaddr *ifpub;
1393 spin_lock_bh(&ifp->lock);
1394 ifpub = ifp->ifpub;
1395 if (ifpub) {
1396 in6_ifa_hold(ifpub);
1397 spin_unlock_bh(&ifp->lock);
1398 ipv6_create_tempaddr(ifpub, ifp);
1399 in6_ifa_put(ifpub);
1400 } else {
1401 spin_unlock_bh(&ifp->lock);
1402 }
1403 ipv6_del_addr(ifp);
1404#endif
1405 } else
1406 ipv6_del_addr(ifp);
1407}
1408
f2344a13
HX		 1409static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1410{
1411 int err = -ENOENT;
1412
1413 spin_lock(&ifp->state_lock);
1414 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1415 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1416 err = 0;
1417 }
1418 spin_unlock(&ifp->state_lock);
1419
1420 return err;
1421}
1422
3c21edbd
YH		 1423void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1424{
1b34be74 1425 struct inet6_dev *idev = ifp->idev;
9bdd8d40 1426
f2344a13
HX		 1427 if (addrconf_dad_end(ifp))
1428 return;
1429
9bdd8d40 1430 if (net_ratelimit())
0522fea6
JR		 1431 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1432 ifp->idev->dev->name, &ifp->addr);
9bdd8d40 1433
1b34be74
YH		 1434 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1435 struct in6_addr addr;
1436
1437 addr.s6_addr32[0] = htonl(0xfe800000);
1438 addr.s6_addr32[1] = 0;
1439
1440 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1441 ipv6_addr_equal(&ifp->addr, &addr)) {
1442 /* DAD failed for link-local based on MAC address */
1443 idev->cnf.disable_ipv6 = 1;
9bdd8d40
BH		 1444
1445 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1446 ifp->idev->dev->name);
1b34be74
YH		 1447 }
1448 }
1449
cc411d0b 1450 addrconf_dad_stop(ifp, 1);
3c21edbd 1451}
1da177e4
LT		 1452
1453/* Join to solicited addr multicast group. */
1454
1455void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1456{
1457 struct in6_addr maddr;
1458
1459 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1460 return;
1461
1462 addrconf_addr_solict_mult(addr, &maddr);
1463 ipv6_dev_mc_inc(dev, &maddr);
1464}
1465
1466void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1467{
1468 struct in6_addr maddr;
1469
1470 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1471 return;
1472
1473 addrconf_addr_solict_mult(addr, &maddr);
1474 __ipv6_dev_mc_dec(idev, &maddr);
1475}
1476
20380731 1477static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1478{
1479 struct in6_addr addr;
1480 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1481 if (ipv6_addr_any(&addr))
1482 return;
1483 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1484}
1485
20380731 1486static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1487{
1488 struct in6_addr addr;
1489 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490 if (ipv6_addr_any(&addr))
1491 return;
1492 __ipv6_dev_ac_dec(ifp->idev, &addr);
1493}
1494
073a8e0e
YH		 1495static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1496{
1497 if (dev->addr_len != ETH_ALEN)
1498 return -1;
1499 memcpy(eui, dev->dev_addr, 3);
1500 memcpy(eui + 5, dev->dev_addr + 3, 3);
1501
1502 /*
1503 * The zSeries OSA network cards can be shared among various
1504 * OS instances, but the OSA cards have only one MAC address.
1505 * This leads to duplicate address conflicts in conjunction
1506 * with IPv6 if more than one instance uses the same card.
1507 *
1508 * The driver for these cards can deliver a unique 16-bit
1509 * identifier for each instance sharing the same card. It is
1510 * placed instead of 0xFFFE in the interface identifier. The
1511 * "u" bit of the interface identifier is not inverted in this
1512 * case. Hence the resulting interface identifier has local
1513 * scope according to RFC2373.
1514 */
1515 if (dev->dev_id) {
1516 eui[3] = (dev->dev_id >> 8) & 0xFF;
1517 eui[4] = dev->dev_id & 0xFF;
1518 } else {
1519 eui[3] = 0xFF;
1520 eui[4] = 0xFE;
1521 eui[0] ^= 2;
1522 }
1523 return 0;
1524}
1525
1526static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1527{
1528 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1529 if (dev->addr_len != ARCNET_ALEN)
1530 return -1;
1531 memset(eui, 0, 7);
1532 eui[7] = *(u8*)dev->dev_addr;
1533 return 0;
1534}
1535
1536static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1537{
1538 if (dev->addr_len != INFINIBAND_ALEN)
1539 return -1;
1540 memcpy(eui, dev->dev_addr + 12, 8);
1541 eui[0] |= 2;
1542 return 0;
1543}
1544
dfd982ba
YH		 1545int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1546{
9af28511
SH		 1547 if (addr == 0)
1548 return -1;
dfd982ba
YH		 1549 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1550 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1551 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1552 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1553 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1554 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1555 eui[1] = 0;
1556 eui[2] = 0x5E;
1557 eui[3] = 0xFE;
1558 memcpy(eui + 4, &addr, 4);
1559 return 0;
1560}
1561EXPORT_SYMBOL(__ipv6_isatap_ifid);
1562
1563static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1564{
1565 if (dev->priv_flags & IFF_ISATAP)
1566 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1567 return -1;
1568}
1569
1da177e4
LT		 1570static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1571{
1572 switch (dev->type) {
1573 case ARPHRD_ETHER:
1574 case ARPHRD_FDDI:
1575 case ARPHRD_IEEE802_TR:
073a8e0e 1576 return addrconf_ifid_eui48(eui, dev);
1da177e4 1577 case ARPHRD_ARCNET:
073a8e0e 1578 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1579 case ARPHRD_INFINIBAND:
073a8e0e 1580 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0 1581 case ARPHRD_SIT:
dfd982ba 1582 return addrconf_ifid_sit(eui, dev);
1da177e4
LT		 1583 }
1584 return -1;
1585}
1586
1587static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1588{
1589 int err = -1;
1590 struct inet6_ifaddr *ifp;
1591
1592 read_lock_bh(&idev->lock);
502a2ffd 1593 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 1594 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1595 memcpy(eui, ifp->addr.s6_addr+8, 8);
1596 err = 0;
1597 break;
1598 }
1599 }
1600 read_unlock_bh(&idev->lock);
1601 return err;
1602}
1603
1604#ifdef CONFIG_IPV6_PRIVACY
1605/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1606static int __ipv6_regen_rndid(struct inet6_dev *idev)
1607{
1da177e4 1608regen:
955189ef 1609 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1610 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1611
1612 /*
1613 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1614 * check if generated address is not inappropriate
1615 *
1616 * - Reserved subnet anycast (RFC 2526)
1617 * 11111101 11....11 1xxxxxxx
c7dc89c0 1618 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1619 * 00-00-5E-FE-xx-xx-xx-xx
1620 * - value 0
1621 * - XXX: already assigned to an address on the device
1622 */
1ab1457c 1623 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1624 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1625 (idev->rndid[7]&0x80))
1626 goto regen;
1627 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1628 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1629 goto regen;
1630 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1631 goto regen;
1632 }
1633
1634 return 0;
1635}
1636
1637static void ipv6_regen_rndid(unsigned long data)
1638{
1639 struct inet6_dev *idev = (struct inet6_dev *) data;
1640 unsigned long expires;
1641
8814c4b5 1642 rcu_read_lock_bh();
1da177e4
LT		 1643 write_lock_bh(&idev->lock);
1644
1645 if (idev->dead)
1646 goto out;
1647
1648 if (__ipv6_regen_rndid(idev) < 0)
1649 goto out;
1ab1457c 1650
1da177e4 1651 expires = jiffies +
1ab1457c 1652 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1653 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1654 if (time_before(expires, jiffies)) {
1655 printk(KERN_WARNING
1656 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1657 idev->dev->name);
1658 goto out;
1659 }
1660
1661 if (!mod_timer(&idev->regen_timer, expires))
1662 in6_dev_hold(idev);
1663
1664out:
1665 write_unlock_bh(&idev->lock);
8814c4b5 1666 rcu_read_unlock_bh();
1da177e4
LT		 1667 in6_dev_put(idev);
1668}
1669
1670static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1671 int ret = 0;
1672
1673 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1674 ret = __ipv6_regen_rndid(idev);
1675 return ret;
1676}
1677#endif
1678
1679/*
1680 * Add prefix route.
1681 */
1682
1683static void
1684addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1685 unsigned long expires, u32 flags)
1da177e4 1686{
86872cb5
TG		 1687 struct fib6_config cfg = {
1688 .fc_table = RT6_TABLE_PREFIX,
1689 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1690 .fc_ifindex = dev->ifindex,
1691 .fc_expires = expires,
1692 .fc_dst_len = plen,
1693 .fc_flags = RTF_UP | flags,
c346dca1 1694 .fc_nlinfo.nl_net = dev_net(dev),
f410a1fb 1695 .fc_protocol = RTPROT_KERNEL,
86872cb5 1696 };
1da177e4 1697
86872cb5 1698 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1699
1700 /* Prevent useless cloning on PtP SIT.
1701 This thing is done here expecting that the whole
1702 class of non-broadcast devices need not cloning.
1703 */
0be669bb 1704#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1705 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1706 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1707#endif
1da177e4 1708
86872cb5 1709 ip6_route_add(&cfg);
1da177e4
LT		 1710}
1711
1712/* Create "default" multicast route to the interface */
1713
1714static void addrconf_add_mroute(struct net_device *dev)
1715{
86872cb5
TG		 1716 struct fib6_config cfg = {
1717 .fc_table = RT6_TABLE_LOCAL,
1718 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1719 .fc_ifindex = dev->ifindex,
1720 .fc_dst_len = 8,
1721 .fc_flags = RTF_UP,
c346dca1 1722 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5
TG		 1723 };
1724
1725 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1726
1727 ip6_route_add(&cfg);
1da177e4
LT		 1728}
1729
0be669bb 1730#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1731static void sit_route_add(struct net_device *dev)
1732{
86872cb5
TG		 1733 struct fib6_config cfg = {
1734 .fc_table = RT6_TABLE_MAIN,
1735 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1736 .fc_ifindex = dev->ifindex,
1737 .fc_dst_len = 96,
1738 .fc_flags = RTF_UP | RTF_NONEXTHOP,
c346dca1 1739 .fc_nlinfo.nl_net = dev_net(dev),
86872cb5 1740 };
1da177e4
LT		 1741
1742 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1743 ip6_route_add(&cfg);
1da177e4 1744}
0be669bb 1745#endif
1da177e4
LT		 1746
1747static void addrconf_add_lroute(struct net_device *dev)
1748{
1749 struct in6_addr addr;
1750
1751 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1752 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1753}
1754
1755static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1756{
1757 struct inet6_dev *idev;
1758
1759 ASSERT_RTNL();
1760
e21e8467
SH		 1761 idev = ipv6_find_idev(dev);
1762 if (!idev)
1da177e4
LT		 1763 return NULL;
1764
1765 /* Add default multicast route */
1766 addrconf_add_mroute(dev);
1767
1768 /* Add link local route */
1769 addrconf_add_lroute(dev);
1770 return idev;
1771}
1772
1773void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1774{
1775 struct prefix_info *pinfo;
1776 __u32 valid_lft;
1777 __u32 prefered_lft;
1778 int addr_type;
1da177e4 1779 struct inet6_dev *in6_dev;
56d417b1 1780 struct net *net = dev_net(dev);
1da177e4
LT		 1781
1782 pinfo = (struct prefix_info *) opt;
1ab1457c 1783
1da177e4
LT		 1784 if (len < sizeof(struct prefix_info)) {
1785 ADBG(("addrconf: prefix option too short\n"));
1786 return;
1787 }
1ab1457c 1788
1da177e4
LT		 1789 /*
1790 * Validation checks ([ADDRCONF], page 19)
1791 */
1792
1793 addr_type = ipv6_addr_type(&pinfo->prefix);
1794
1795 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1796 return;
1797
1798 valid_lft = ntohl(pinfo->valid);
1799 prefered_lft = ntohl(pinfo->prefered);
1800
1801 if (prefered_lft > valid_lft) {
1802 if (net_ratelimit())
1803 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1804 return;
1805 }
1806
1807 in6_dev = in6_dev_get(dev);
1808
1809 if (in6_dev == NULL) {
1810 if (net_ratelimit())
1811 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1812 return;
1813 }
1814
1815 /*
1816 * Two things going on here:
1817 * 1) Add routes for on-link prefixes
1818 * 2) Configure prefixes with the auto flag set
1819 */
1820
4bed72e4
YH		 1821 if (pinfo->onlink) {
1822 struct rt6_info *rt;
1823 unsigned long rt_expires;
1824
6f704992
YH		 1825 /* Avoid arithmetic overflow. Really, we could
1826 * save rt_expires in seconds, likely valid_lft,
1827 * but it would require division in fib gc, that it
1828 * not good.
1829 */
4bed72e4
YH		 1830 if (HZ > USER_HZ)
1831 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1832 else
1833 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
3dd4bc68 1834
4bed72e4
YH		 1835 if (addrconf_finite_timeout(rt_expires))
1836 rt_expires *= HZ;
1da177e4 1837
56d417b1 1838 rt = rt6_lookup(net, &pinfo->prefix, NULL,
6fda7350 1839 dev->ifindex, 1);
1da177e4 1840
2b5ead46 1841 if (rt && addrconf_is_prefix_route(rt)) {
6f704992
YH		 1842 /* Autoconf prefix route */
1843 if (valid_lft == 0) {
1844 ip6_del_rt(rt);
1845 rt = NULL;
4bed72e4 1846 } else if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1847 /* not infinity */
1848 rt->rt6i_expires = jiffies + rt_expires;
1849 rt->rt6i_flags |= RTF_EXPIRES;
1850 } else {
1851 rt->rt6i_flags &= ~RTF_EXPIRES;
1852 rt->rt6i_expires = 0;
1da177e4
LT		 1853 }
1854 } else if (valid_lft) {
6f704992 1855 clock_t expires = 0;
4bed72e4
YH		 1856 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1857 if (addrconf_finite_timeout(rt_expires)) {
6f704992
YH		 1858 /* not infinity */
1859 flags |= RTF_EXPIRES;
1860 expires = jiffies_to_clock_t(rt_expires);
1861 }
1da177e4 1862 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
6f704992 1863 dev, expires, flags);
1da177e4
LT		 1864 }
1865 if (rt)
1866 dst_release(&rt->u.dst);
1867 }
1868
1869 /* Try to figure out our local address for this prefix */
1870
1871 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1872 struct inet6_ifaddr * ifp;
1873 struct in6_addr addr;
1874 int create = 0, update_lft = 0;
1875
1876 if (pinfo->prefix_len == 64) {
1877 memcpy(&addr, &pinfo->prefix, 8);
1878 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1879 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1880 in6_dev_put(in6_dev);
1881 return;
1882 }
1883 goto ok;
1884 }
1885 if (net_ratelimit())
1886 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1887 pinfo->prefix_len);
1888 in6_dev_put(in6_dev);
1889 return;
1890
1891ok:
1892
53b7997f 1893 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1da177e4
LT		 1894
1895 if (ifp == NULL && valid_lft) {
1896 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1897 u32 addr_flags = 0;
1898
1899#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1900 if (in6_dev->cnf.optimistic_dad &&
53b7997f 1901 !net->ipv6.devconf_all->forwarding)
95c385b4
NH		 1902 addr_flags = IFA_F_OPTIMISTIC;
1903#endif
1da177e4
LT		 1904
1905 /* Do not allow to create too much of autoconfigured
1906 * addresses; this would be too easy way to crash kernel.
1907 */
1908 if (!max_addresses ||
1909 ipv6_count_addresses(in6_dev) < max_addresses)
1910 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1911 addr_type&IPV6_ADDR_SCOPE_MASK,
1912 addr_flags);
1da177e4
LT		 1913
1914 if (!ifp || IS_ERR(ifp)) {
1915 in6_dev_put(in6_dev);
1916 return;
1917 }
1918
1919 update_lft = create = 1;
1920 ifp->cstamp = jiffies;
1921 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1922 }
1923
1924 if (ifp) {
1925 int flags;
1926 unsigned long now;
1927#ifdef CONFIG_IPV6_PRIVACY
1928 struct inet6_ifaddr *ift;
1929#endif
1930 u32 stored_lft;
1931
1932 /* update lifetime (RFC2462 5.5.3 e) */
1933 spin_lock(&ifp->lock);
1934 now = jiffies;
1935 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1936 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1937 else
1938 stored_lft = 0;
1939 if (!update_lft && stored_lft) {
1940 if (valid_lft > MIN_VALID_LIFETIME ||
1941 valid_lft > stored_lft)
1942 update_lft = 1;
1943 else if (stored_lft <= MIN_VALID_LIFETIME) {
1944 /* valid_lft <= stored_lft is always true */
a1ed0526
BH		 1945 /*
1946 * RFC 4862 Section 5.5.3e:
1947 * "Note that the preferred lifetime of
1948 * the corresponding address is always
1949 * reset to the Preferred Lifetime in
1950 * the received Prefix Information
1951 * option, regardless of whether the
1952 * valid lifetime is also reset or
1953 * ignored."
1954 *
1955 * So if the preferred lifetime in
1956 * this advertisement is different
1957 * than what we have stored, but the
1958 * valid lifetime is invalid, just
1959 * reset prefered_lft.
1960 *
1961 * We must set the valid lifetime
1962 * to the stored lifetime since we'll
1963 * be updating the timestamp below,
1964 * else we'll set it back to the
1965 * minumum.
1966 */
1967 if (prefered_lft != ifp->prefered_lft) {
1968 valid_lft = stored_lft;
1969 update_lft = 1;
1970 }
1da177e4
LT		 1971 } else {
1972 valid_lft = MIN_VALID_LIFETIME;
1973 if (valid_lft < prefered_lft)
1974 prefered_lft = valid_lft;
1975 update_lft = 1;
1976 }
1977 }
1978
1979 if (update_lft) {
1980 ifp->valid_lft = valid_lft;
1981 ifp->prefered_lft = prefered_lft;
1982 ifp->tstamp = now;
1983 flags = ifp->flags;
1984 ifp->flags &= ~IFA_F_DEPRECATED;
1985 spin_unlock(&ifp->lock);
1986
1987 if (!(flags&IFA_F_TENTATIVE))
1988 ipv6_ifa_notify(0, ifp);
1989 } else
1990 spin_unlock(&ifp->lock);
1991
1992#ifdef CONFIG_IPV6_PRIVACY
1993 read_lock_bh(&in6_dev->lock);
1994 /* update all temporary addresses in the list */
372e6c8f 1995 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1da177e4
LT		 1996 /*
1997 * When adjusting the lifetimes of an existing
1998 * temporary address, only lower the lifetimes.
1999 * Implementations must not increase the
2000 * lifetimes of an existing temporary address
2001 * when processing a Prefix Information Option.
2002 */
c6fbfac2
BB		 2003 if (ifp != ift->ifpub)
2004 continue;
2005
1da177e4
LT		 2006 spin_lock(&ift->lock);
2007 flags = ift->flags;
2008 if (ift->valid_lft > valid_lft &&
2009 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2010 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2011 if (ift->prefered_lft > prefered_lft &&
2012 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2014 spin_unlock(&ift->lock);
2015 if (!(flags&IFA_F_TENTATIVE))
2016 ipv6_ifa_notify(0, ift);
2017 }
2018
2019 if (create && in6_dev->cnf.use_tempaddr > 0) {
2020 /*
2021 * When a new public address is created as described in [ADDRCONF],
2022 * also create a new temporary address.
2023 */
1ab1457c 2024 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 2025 ipv6_create_tempaddr(ifp, NULL);
2026 } else {
2027 read_unlock_bh(&in6_dev->lock);
2028 }
2029#endif
2030 in6_ifa_put(ifp);
2031 addrconf_verify(0);
2032 }
2033 }
2034 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2035 in6_dev_put(in6_dev);
2036}
2037
2038/*
2039 * Set destination address.
2040 * Special case for SIT interfaces where we create a new "virtual"
2041 * device.
2042 */
af284937 2043int addrconf_set_dstaddr(struct net *net, void __user *arg)
1da177e4
LT		 2044{
2045 struct in6_ifreq ireq;
2046 struct net_device *dev;
2047 int err = -EINVAL;
2048
2049 rtnl_lock();
2050
2051 err = -EFAULT;
2052 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2053 goto err_exit;
2054
af284937 2055 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1da177e4
LT		 2056
2057 err = -ENODEV;
2058 if (dev == NULL)
2059 goto err_exit;
2060
0be669bb 2061#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4 2062 if (dev->type == ARPHRD_SIT) {
5bc3eb7e 2063 const struct net_device_ops *ops = dev->netdev_ops;
1da177e4 2064 struct ifreq ifr;
1da177e4
LT		 2065 struct ip_tunnel_parm p;
2066
2067 err = -EADDRNOTAVAIL;
2068 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2069 goto err_exit;
2070
2071 memset(&p, 0, sizeof(p));
2072 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2073 p.iph.saddr = 0;
2074 p.iph.version = 4;
2075 p.iph.ihl = 5;
2076 p.iph.protocol = IPPROTO_IPV6;
2077 p.iph.ttl = 64;
d20b3109 2078 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4 2079
5bc3eb7e
SH		 2080 if (ops->ndo_do_ioctl) {
2081 mm_segment_t oldfs = get_fs();
2082
2083 set_fs(KERNEL_DS);
2084 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2085 set_fs(oldfs);
2086 } else
2087 err = -EOPNOTSUPP;
1da177e4
LT		 2088
2089 if (err == 0) {
2090 err = -ENOBUFS;
af284937
DL		 2091 dev = __dev_get_by_name(net, p.name);
2092 if (!dev)
1da177e4
LT		 2093 goto err_exit;
2094 err = dev_open(dev);
2095 }
2096 }
0be669bb 2097#endif
1da177e4
LT		 2098
2099err_exit:
2100 rtnl_unlock();
2101 return err;
2102}
2103
2104/*
2105 * Manual configuration of address on an interface
2106 */
af284937 2107static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2108 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
af284937 2109 __u32 valid_lft)
1da177e4
LT		 2110{
2111 struct inet6_ifaddr *ifp;
2112 struct inet6_dev *idev;
2113 struct net_device *dev;
2114 int scope;
6f704992
YH		 2115 u32 flags;
2116 clock_t expires;
4bed72e4 2117 unsigned long timeout;
1da177e4
LT		 2118
2119 ASSERT_RTNL();
1ab1457c 2120
24ef0da7
TG		 2121 if (plen > 128)
2122 return -EINVAL;
2123
0778769d
NT		 2124 /* check the lifetime */
2125 if (!valid_lft || prefered_lft > valid_lft)
2126 return -EINVAL;
2127
af284937
DL		 2128 dev = __dev_get_by_index(net, ifindex);
2129 if (!dev)
1da177e4 2130 return -ENODEV;
1ab1457c 2131
1da177e4
LT		 2132 if ((idev = addrconf_add_dev(dev)) == NULL)
2133 return -ENOBUFS;
2134
2135 scope = ipv6_addr_scope(pfx);
2136
4bed72e4
YH		 2137 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2138 if (addrconf_finite_timeout(timeout)) {
2139 expires = jiffies_to_clock_t(timeout * HZ);
2140 valid_lft = timeout;
6f704992 2141 flags = RTF_EXPIRES;
4bed72e4
YH		 2142 } else {
2143 expires = 0;
2144 flags = 0;
2145 ifa_flags |= IFA_F_PERMANENT;
6f704992 2146 }
0778769d 2147
4bed72e4
YH		 2148 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2149 if (addrconf_finite_timeout(timeout)) {
2150 if (timeout == 0)
2151 ifa_flags |= IFA_F_DEPRECATED;
2152 prefered_lft = timeout;
2153 }
0778769d
NT		 2154
2155 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2156
1da177e4 2157 if (!IS_ERR(ifp)) {
06aebfb7 2158 spin_lock_bh(&ifp->lock);
0778769d
NT		 2159 ifp->valid_lft = valid_lft;
2160 ifp->prefered_lft = prefered_lft;
2161 ifp->tstamp = jiffies;
06aebfb7 2162 spin_unlock_bh(&ifp->lock);
0778769d 2163
46d48046 2164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
6f704992 2165 expires, flags);
95c385b4
NH		 2166 /*
2167 * Note that section 3.1 of RFC 4429 indicates
2168 * that the Optimistic flag should not be set for
2169 * manually configured addresses
2170 */
1da177e4
LT		 2171 addrconf_dad_start(ifp, 0);
2172 in6_ifa_put(ifp);
0778769d 2173 addrconf_verify(0);
1da177e4
LT		 2174 return 0;
2175 }
2176
2177 return PTR_ERR(ifp);
2178}
2179
af284937 2180static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
24ef0da7 2181 unsigned int plen)
1da177e4
LT		 2182{
2183 struct inet6_ifaddr *ifp;
2184 struct inet6_dev *idev;
2185 struct net_device *dev;
1ab1457c 2186
24ef0da7
TG		 2187 if (plen > 128)
2188 return -EINVAL;
2189
af284937
DL		 2190 dev = __dev_get_by_index(net, ifindex);
2191 if (!dev)
1da177e4
LT		 2192 return -ENODEV;
2193
2194 if ((idev = __in6_dev_get(dev)) == NULL)
2195 return -ENXIO;
2196
2197 read_lock_bh(&idev->lock);
502a2ffd 2198 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1da177e4
LT		 2199 if (ifp->prefix_len == plen &&
2200 ipv6_addr_equal(pfx, &ifp->addr)) {
2201 in6_ifa_hold(ifp);
2202 read_unlock_bh(&idev->lock);
1ab1457c 2203
1da177e4
LT		 2204 ipv6_del_addr(ifp);
2205
2206 /* If the last address is deleted administratively,
2207 disable IPv6 on this interface.
2208 */
502a2ffd 2209 if (list_empty(&idev->addr_list))
1da177e4
LT		 2210 addrconf_ifdown(idev->dev, 1);
2211 return 0;
2212 }
2213 }
2214 read_unlock_bh(&idev->lock);
2215 return -EADDRNOTAVAIL;
2216}
2217
2218
af284937 2219int addrconf_add_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2220{
2221 struct in6_ifreq ireq;
2222 int err;
1ab1457c 2223
1da177e4
LT		 2224 if (!capable(CAP_NET_ADMIN))
2225 return -EPERM;
1ab1457c 2226
1da177e4
LT		 2227 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2228 return -EFAULT;
2229
2230 rtnl_lock();
af284937
DL		 2231 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2232 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2233 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2234 rtnl_unlock();
2235 return err;
2236}
2237
af284937 2238int addrconf_del_ifaddr(struct net *net, void __user *arg)
1da177e4
LT		 2239{
2240 struct in6_ifreq ireq;
2241 int err;
1ab1457c 2242
1da177e4
LT		 2243 if (!capable(CAP_NET_ADMIN))
2244 return -EPERM;
2245
2246 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2247 return -EFAULT;
2248
2249 rtnl_lock();
af284937
DL		 2250 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2251 ireq.ifr6_prefixlen);
1da177e4
LT		 2252 rtnl_unlock();
2253 return err;
2254}
2255
b5f348e5
IJ		 2256static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2257 int plen, int scope)
2258{
2259 struct inet6_ifaddr *ifp;
2260
2261 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2262 if (!IS_ERR(ifp)) {
2263 spin_lock_bh(&ifp->lock);
2264 ifp->flags &= ~IFA_F_TENTATIVE;
2265 spin_unlock_bh(&ifp->lock);
2266 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2267 in6_ifa_put(ifp);
2268 }
2269}
2270
0be669bb 2271#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2272static void sit_add_v4_addrs(struct inet6_dev *idev)
2273{
1da177e4
LT		 2274 struct in6_addr addr;
2275 struct net_device *dev;
c346dca1 2276 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2277 int scope;
2278
2279 ASSERT_RTNL();
2280
2281 memset(&addr, 0, sizeof(struct in6_addr));
2282 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2283
2284 if (idev->dev->flags&IFF_POINTOPOINT) {
2285 addr.s6_addr32[0] = htonl(0xfe800000);
2286 scope = IFA_LINK;
2287 } else {
2288 scope = IPV6_ADDR_COMPATv4;
2289 }
2290
2291 if (addr.s6_addr32[3]) {
b5f348e5 2292 add_addr(idev, &addr, 128, scope);
1da177e4
LT		 2293 return;
2294 }
2295
6fda7350 2296 for_each_netdev(net, dev) {
e5ed6399 2297 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2298 if (in_dev && (dev->flags & IFF_UP)) {
2299 struct in_ifaddr * ifa;
2300
2301 int flag = scope;
2302
2303 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2304 int plen;
2305
2306 addr.s6_addr32[3] = ifa->ifa_local;
2307
2308 if (ifa->ifa_scope == RT_SCOPE_LINK)
2309 continue;
2310 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2311 if (idev->dev->flags&IFF_POINTOPOINT)
2312 continue;
2313 flag |= IFA_HOST;
2314 }
2315 if (idev->dev->flags&IFF_POINTOPOINT)
2316 plen = 64;
2317 else
2318 plen = 96;
2319
b5f348e5 2320 add_addr(idev, &addr, plen, flag);
1da177e4
LT		 2321 }
2322 }
1ab1457c 2323 }
1da177e4 2324}
0be669bb 2325#endif
1da177e4
LT		 2326
2327static void init_loopback(struct net_device *dev)
2328{
2329 struct inet6_dev *idev;
1da177e4
LT		 2330
2331 /* ::1 */
2332
2333 ASSERT_RTNL();
2334
2335 if ((idev = ipv6_find_idev(dev)) == NULL) {
2336 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2337 return;
2338 }
2339
b5f348e5 2340 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
1da177e4
LT		 2341}
2342
2343static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2344{
2345 struct inet6_ifaddr * ifp;
95c385b4
NH		 2346 u32 addr_flags = IFA_F_PERMANENT;
2347
2348#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2349 if (idev->cnf.optimistic_dad &&
702beb87 2350 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
95c385b4
NH		 2351 addr_flags |= IFA_F_OPTIMISTIC;
2352#endif
1da177e4 2353
95c385b4
NH		 2354
2355 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2356 if (!IS_ERR(ifp)) {
46d48046 2357 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2358 addrconf_dad_start(ifp, 0);
2359 in6_ifa_put(ifp);
2360 }
2361}
2362
2363static void addrconf_dev_config(struct net_device *dev)
2364{
2365 struct in6_addr addr;
2366 struct inet6_dev * idev;
2367
2368 ASSERT_RTNL();
2369
74235a25
HX		 2370 if ((dev->type != ARPHRD_ETHER) &&
2371 (dev->type != ARPHRD_FDDI) &&
2372 (dev->type != ARPHRD_IEEE802_TR) &&
2373 (dev->type != ARPHRD_ARCNET) &&
2374 (dev->type != ARPHRD_INFINIBAND)) {
2375 /* Alas, we support only Ethernet autoconfiguration. */
2376 return;
2377 }
2378
1da177e4
LT		 2379 idev = addrconf_add_dev(dev);
2380 if (idev == NULL)
2381 return;
2382
2383 memset(&addr, 0, sizeof(struct in6_addr));
2384 addr.s6_addr32[0] = htonl(0xFE800000);
2385
2386 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2387 addrconf_add_linklocal(idev, &addr);
2388}
2389
0be669bb 2390#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2391static void addrconf_sit_config(struct net_device *dev)
2392{
2393 struct inet6_dev *idev;
2394
2395 ASSERT_RTNL();
2396
1ab1457c
YH		 2397 /*
2398 * Configure the tunnel with one of our IPv4
2399 * addresses... we should configure all of
1da177e4
LT		 2400 * our v4 addrs in the tunnel
2401 */
2402
2403 if ((idev = ipv6_find_idev(dev)) == NULL) {
2404 printk(KERN_DEBUG "init sit: add_dev failed\n");
2405 return;
2406 }
2407
c7dc89c0
FT		 2408 if (dev->priv_flags & IFF_ISATAP) {
2409 struct in6_addr addr;
2410
2411 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2412 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2413 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2414 addrconf_add_linklocal(idev, &addr);
2415 return;
2416 }
2417
1da177e4
LT		 2418 sit_add_v4_addrs(idev);
2419
2420 if (dev->flags&IFF_POINTOPOINT) {
2421 addrconf_add_mroute(dev);
2422 addrconf_add_lroute(dev);
2423 } else
2424 sit_route_add(dev);
2425}
0be669bb 2426#endif
1da177e4
LT		 2427
2428static inline int
2429ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2430{
2431 struct in6_addr lladdr;
2432
95c385b4 2433 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2434 addrconf_add_linklocal(idev, &lladdr);
2435 return 0;
2436 }
2437 return -1;
2438}
2439
2440static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2441{
2442 struct net_device *link_dev;
c346dca1 2443 struct net *net = dev_net(idev->dev);
1da177e4
LT		 2444
2445 /* first try to inherit the link-local address from the link device */
2446 if (idev->dev->iflink &&
6fda7350 2447 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
1da177e4
LT		 2448 if (!ipv6_inherit_linklocal(idev, link_dev))
2449 return;
2450 }
2451 /* then try to inherit it from any device */
6fda7350 2452 for_each_netdev(net, link_dev) {
1da177e4
LT		 2453 if (!ipv6_inherit_linklocal(idev, link_dev))
2454 return;
2455 }
2456 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2457}
2458
2459/*
2460 * Autoconfigure tunnel with a link-local address so routing protocols,
2461 * DHCPv6, MLD etc. can be run over the virtual link
2462 */
2463
2464static void addrconf_ip6_tnl_config(struct net_device *dev)
2465{
2466 struct inet6_dev *idev;
2467
2468 ASSERT_RTNL();
2469
e21e8467
SH		 2470 idev = addrconf_add_dev(dev);
2471 if (!idev) {
1da177e4
LT		 2472 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2473 return;
2474 }
2475 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2476}
2477
1ab1457c 2478static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2479 void * data)
2480{
2481 struct net_device *dev = (struct net_device *) data;
74235a25 2482 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2483 int run_pending = 0;
b217d616 2484 int err;
1da177e4 2485
e21e8467 2486 switch (event) {
45ba9dd2 2487 case NETDEV_REGISTER:
74235a25 2488 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2489 idev = ipv6_add_dev(dev);
2490 if (!idev)
b217d616 2491 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2492 }
2493 break;
bcdd553f 2494
1da177e4 2495 case NETDEV_UP:
3c21edbd 2496 case NETDEV_CHANGE:
c2edacf8
JV		 2497 if (dev->flags & IFF_SLAVE)
2498 break;
2499
3c21edbd 2500 if (event == NETDEV_UP) {
f24e3d65 2501 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2502 /* device is not ready yet. */
2503 printk(KERN_INFO
2504 "ADDRCONF(NETDEV_UP): %s: "
2505 "link is not ready\n",
2506 dev->name);
2507 break;
2508 }
99081049 2509
d31c7b8f
EP		 2510 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2511 idev = ipv6_add_dev(dev);
2512
e3ec6cfc 2513 if (idev) {
99081049 2514 idev->if_flags |= IF_READY;
e3ec6cfc
BT		 2515 run_pending = 1;
2516 }
3c21edbd 2517 } else {
f24e3d65 2518 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2519 /* device is still not ready. */
2520 break;
2521 }
2522
2523 if (idev) {
bcdd553f 2524 if (idev->if_flags & IF_READY)
3c21edbd
YH		 2525 /* device is already configured. */
2526 break;
3c21edbd
YH		 2527 idev->if_flags |= IF_READY;
2528 }
2529
2530 printk(KERN_INFO
2531 "ADDRCONF(NETDEV_CHANGE): %s: "
2532 "link becomes ready\n",
2533 dev->name);
2534
c5e33bdd 2535 run_pending = 1;
3c21edbd
YH		 2536 }
2537
e21e8467 2538 switch (dev->type) {
0be669bb 2539#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2540 case ARPHRD_SIT:
2541 addrconf_sit_config(dev);
2542 break;
0be669bb 2543#endif
1da177e4
LT		 2544 case ARPHRD_TUNNEL6:
2545 addrconf_ip6_tnl_config(dev);
2546 break;
2547 case ARPHRD_LOOPBACK:
2548 init_loopback(dev);
2549 break;
2550
2551 default:
2552 addrconf_dev_config(dev);
2553 break;
3ff50b79 2554 }
bcdd553f 2555
1da177e4 2556 if (idev) {
c5e33bdd
YH		 2557 if (run_pending)
2558 addrconf_dad_run(idev);
2559
bcdd553f
SH		 2560 /*
2561 * If the MTU changed during the interface down,
2562 * when the interface up, the changed MTU must be
2563 * reflected in the idev as well as routers.
1da177e4 2564 */
bcdd553f
SH		 2565 if (idev->cnf.mtu6 != dev->mtu &&
2566 dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2567 rt6_mtu_change(dev, dev->mtu);
2568 idev->cnf.mtu6 = dev->mtu;
2569 }
2570 idev->tstamp = jiffies;
2571 inet6_ifinfo_notify(RTM_NEWLINK, idev);
bcdd553f
SH		 2572
2573 /*
2574 * If the changed mtu during down is lower than
2575 * IPV6_MIN_MTU stop IPv6 on this interface.
1da177e4
LT		 2576 */
2577 if (dev->mtu < IPV6_MIN_MTU)
bcdd553f 2578 addrconf_ifdown(dev, 1);
1da177e4
LT		 2579 }
2580 break;
2581
2582 case NETDEV_CHANGEMTU:
d31c7b8f 2583 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2584 rt6_mtu_change(dev, dev->mtu);
2585 idev->cnf.mtu6 = dev->mtu;
2586 break;
2587 }
2588
d31c7b8f
EP		 2589 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2590 idev = ipv6_add_dev(dev);
2591 if (idev)
2592 break;
2593 }
2594
bcdd553f
SH		 2595 /*
2596 * MTU falled under IPV6_MIN_MTU.
2597 * Stop IPv6 on this interface.
2598 */
1da177e4
LT		 2599
2600 case NETDEV_DOWN:
2601 case NETDEV_UNREGISTER:
2602 /*
2603 * Remove all addresses from this interface.
2604 */
2605 addrconf_ifdown(dev, event != NETDEV_DOWN);
2606 break;
3c21edbd 2607
1da177e4 2608 case NETDEV_CHANGENAME:
1da177e4 2609 if (idev) {
5632c515 2610 snmp6_unregister_dev(idev);
408c4768 2611 addrconf_sysctl_unregister(idev);
f52295a9 2612 addrconf_sysctl_register(idev);
b217d616
HX		 2613 err = snmp6_register_dev(idev);
2614 if (err)
2615 return notifier_from_errno(err);
5632c515 2616 }
1da177e4 2617 break;
bcdd553f 2618
93d9b7d7
JP		 2619 case NETDEV_PRE_TYPE_CHANGE:
2620 case NETDEV_POST_TYPE_CHANGE:
2621 addrconf_type_change(dev, event);
75c78500 2622 break;
3ff50b79 2623 }
1da177e4
LT		 2624
2625 return NOTIFY_OK;
2626}
2627
2628/*
2629 * addrconf module should be notified of a device going up
2630 */
2631static struct notifier_block ipv6_dev_notf = {
2632 .notifier_call = addrconf_notify,
1da177e4
LT		 2633};
2634
93d9b7d7 2635static void addrconf_type_change(struct net_device *dev, unsigned long event)
75c78500
MS		 2636{
2637 struct inet6_dev *idev;
2638 ASSERT_RTNL();
2639
2640 idev = __in6_dev_get(dev);
2641
93d9b7d7 2642 if (event == NETDEV_POST_TYPE_CHANGE)
75c78500 2643 ipv6_mc_remap(idev);
93d9b7d7 2644 else if (event == NETDEV_PRE_TYPE_CHANGE)
75c78500
MS		 2645 ipv6_mc_unmap(idev);
2646}
2647
1da177e4
LT		 2648static int addrconf_ifdown(struct net_device *dev, int how)
2649{
c346dca1 2650 struct net *net = dev_net(dev);
502a2ffd 2651 struct inet6_dev *idev;
2652 struct inet6_ifaddr *ifa;
2653 LIST_HEAD(keep_list);
4c5ff6a6 2654 int state;
1da177e4
LT		 2655
2656 ASSERT_RTNL();
2657
f3db4851 2658 rt6_ifdown(net, dev);
1da177e4
LT		 2659 neigh_ifdown(&nd_tbl, dev);
2660
2661 idev = __in6_dev_get(dev);
2662 if (idev == NULL)
2663 return -ENODEV;
2664
bcdd553f
SH		 2665 /*
2666 * Step 1: remove reference to ipv6 device from parent device.
2667 * Do not dev_put!
1da177e4 2668 */
439e2385 2669 if (how) {
1da177e4 2670 idev->dead = 1;
8814c4b5
YH		 2671
2672 /* protected by rtnl_lock */
2673 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2674
2675 /* Step 1.5: remove snmp6 entry */
2676 snmp6_unregister_dev(idev);
2677
2678 }
2679
1da177e4
LT		 2680 write_lock_bh(&idev->lock);
2681
bcdd553f 2682 /* Step 2: clear flags for stateless addrconf */
439e2385 2683 if (!how)
3c21edbd 2684 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4 2685
1da177e4 2686#ifdef CONFIG_IPV6_PRIVACY
439e2385 2687 if (how && del_timer(&idev->regen_timer))
1da177e4
LT		 2688 in6_dev_put(idev);
2689
bcdd553f 2690 /* Step 3: clear tempaddr list */
372e6c8f 2691 while (!list_empty(&idev->tempaddr_list)) {
2692 ifa = list_first_entry(&idev->tempaddr_list,
2693 struct inet6_ifaddr, tmp_list);
2694 list_del(&ifa->tmp_list);
1da177e4
LT		 2695 write_unlock_bh(&idev->lock);
2696 spin_lock_bh(&ifa->lock);
2697
2698 if (ifa->ifpub) {
2699 in6_ifa_put(ifa->ifpub);
2700 ifa->ifpub = NULL;
2701 }
2702 spin_unlock_bh(&ifa->lock);
2703 in6_ifa_put(ifa);
2704 write_lock_bh(&idev->lock);
2705 }
2706#endif
8f37ada5 2707
502a2ffd 2708 while (!list_empty(&idev->addr_list)) {
2709 ifa = list_first_entry(&idev->addr_list,
2710 struct inet6_ifaddr, if_list);
84e8b803 2711 addrconf_del_timer(ifa);
2712
2713 /* If just doing link down, and address is permanent
2714 and not link-local, then retain it. */
bcdd553f 2715 if (!how &&
84e8b803 2716 (ifa->flags&IFA_F_PERMANENT) &&
2717 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
502a2ffd 2718 list_move_tail(&ifa->if_list, &keep_list);
dc2b99f7 2719
84e8b803 2720 /* If not doing DAD on this address, just keep it. */
2721 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2722 idev->cnf.accept_dad <= 0 ||
2723 (ifa->flags & IFA_F_NODAD))
2724 continue;
2725
2726 /* If it was tentative already, no need to notify */
2727 if (ifa->flags & IFA_F_TENTATIVE)
2728 continue;
2729
2730 /* Flag it for later restoration when link comes up */
2731 ifa->flags |= IFA_F_TENTATIVE;
f2344a13 2732 ifa->state = INET6_IFADDR_STATE_DAD;
4c5ff6a6 2733
27bdb2ab 2734 write_unlock_bh(&idev->lock);
4c5ff6a6
HX		 2735
2736 in6_ifa_hold(ifa);
dc2b99f7 2737 } else {
502a2ffd 2738 list_del(&ifa->if_list);
1da177e4 2739
27bdb2ab 2740 /* clear hash table */
2741 spin_lock_bh(&addrconf_hash_lock);
2742 hlist_del_init_rcu(&ifa->addr_lst);
27bdb2ab 2743 spin_unlock_bh(&addrconf_hash_lock);
4c5ff6a6
HX		 2744
2745 write_unlock_bh(&idev->lock);
2746 spin_lock_bh(&ifa->state_lock);
2747 state = ifa->state;
2748 ifa->state = INET6_IFADDR_STATE_DEAD;
2749 spin_unlock_bh(&ifa->state_lock);
2750
2751 if (state == INET6_IFADDR_STATE_DEAD)
2752 goto put_ifa;
27bdb2ab 2753 }
c2e21293 2754
84e8b803 2755 __ipv6_ifa_notify(RTM_DELADDR, ifa);
e9d3e084 2756 if (ifa->state == INET6_IFADDR_STATE_DEAD)
8595805a 2757 atomic_notifier_call_chain(&inet6addr_chain,
2758 NETDEV_DOWN, ifa);
4c5ff6a6
HX		 2759
2760put_ifa:
84e8b803 2761 in6_ifa_put(ifa);
dc2b99f7 2762
84e8b803 2763 write_lock_bh(&idev->lock);
1da177e4 2764 }
8f37ada5 2765
502a2ffd 2766 list_splice(&keep_list, &idev->addr_list);
8f37ada5 2767
1da177e4
LT		 2768 write_unlock_bh(&idev->lock);
2769
2770 /* Step 5: Discard multicast list */
439e2385 2771 if (how)
1da177e4
LT		 2772 ipv6_mc_destroy_dev(idev);
2773 else
2774 ipv6_mc_down(idev);
2775
1da177e4 2776 idev->tstamp = jiffies;
1ab1457c 2777
bcdd553f 2778 /* Last: Shot the device (if unregistered) */
439e2385 2779 if (how) {
408c4768 2780 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2781 neigh_parms_release(&nd_tbl, idev->nd_parms);
2782 neigh_ifdown(&nd_tbl, dev);
2783 in6_dev_put(idev);
2784 }
2785 return 0;
2786}
2787
2788static void addrconf_rs_timer(unsigned long data)
2789{
2790 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
5b2a1953 2791 struct inet6_dev *idev = ifp->idev;
1da177e4 2792
5b2a1953 2793 read_lock(&idev->lock);
2794 if (idev->dead || !(idev->if_flags & IF_READY))
1da177e4
LT		 2795 goto out;
2796
5b2a1953 2797 if (idev->cnf.forwarding)
2798 goto out;
2799
2800 /* Announcement received after solicitation was sent */
2801 if (idev->if_flags & IF_RA_RCVD)
1da177e4 2802 goto out;
1da177e4
LT		 2803
2804 spin_lock(&ifp->lock);
5b2a1953 2805 if (ifp->probes++ < idev->cnf.rtr_solicits) {
1da177e4
LT		 2806 /* The wait after the last probe can be shorter */
2807 addrconf_mod_timer(ifp, AC_RS,
5b2a1953 2808 (ifp->probes == idev->cnf.rtr_solicits) ?
2809 idev->cnf.rtr_solicit_delay :
2810 idev->cnf.rtr_solicit_interval);
1da177e4
LT		 2811 spin_unlock(&ifp->lock);
2812
5b2a1953 2813 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2814 } else {
2815 spin_unlock(&ifp->lock);
2816 /*
2817 * Note: we do not support deprecated "all on-link"
2818 * assumption any longer.
2819 */
2820 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
5b2a1953 2821 idev->dev->name);
1da177e4
LT		 2822 }
2823
2824out:
5b2a1953 2825 read_unlock(&idev->lock);
1da177e4
LT		 2826 in6_ifa_put(ifp);
2827}
2828
2829/*
2830 * Duplicate Address Detection
2831 */
3c21edbd
YH		 2832static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2833{
2834 unsigned long rand_num;
2835 struct inet6_dev *idev = ifp->idev;
2836
95c385b4
NH		 2837 if (ifp->flags & IFA_F_OPTIMISTIC)
2838 rand_num = 0;
2839 else
2840 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2841
3c21edbd
YH		 2842 ifp->probes = idev->cnf.dad_transmits;
2843 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2844}
2845
e431b8c0 2846static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2847{
2848 struct inet6_dev *idev = ifp->idev;
2849 struct net_device *dev = idev->dev;
1da177e4
LT		 2850
2851 addrconf_join_solict(dev, &ifp->addr);
2852
1da177e4 2853 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2854
2855 read_lock_bh(&idev->lock);
e9d3e084 2856 if (ifp->state == INET6_IFADDR_STATE_DEAD)
1da177e4 2857 goto out;
1da177e4 2858
21809faf 2859 spin_lock(&ifp->lock);
1da177e4 2860 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
1b34be74 2861 idev->cnf.accept_dad < 1 ||
55ebaef1
NT		 2862 !(ifp->flags&IFA_F_TENTATIVE) ||
2863 ifp->flags & IFA_F_NODAD) {
cc411d0b 2864 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2865 spin_unlock(&ifp->lock);
1da177e4
LT		 2866 read_unlock_bh(&idev->lock);
2867
2868 addrconf_dad_completed(ifp);
2869 return;
2870 }
2871
6732bade 2872 if (!(idev->if_flags & IF_READY)) {
21809faf 2873 spin_unlock(&ifp->lock);
6732bade 2874 read_unlock_bh(&idev->lock);
3c21edbd 2875 /*
590a9887 2876 * If the device is not ready:
3c21edbd
YH		 2877 * - keep it tentative if it is a permanent address.
2878 * - otherwise, kill it.
2879 */
2880 in6_ifa_hold(ifp);
cc411d0b 2881 addrconf_dad_stop(ifp, 0);
6732bade 2882 return;
3c21edbd 2883 }
95c385b4
NH		 2884
2885 /*
2886 * Optimistic nodes can start receiving
2887 * Frames right away
2888 */
e21e8467 2889 if (ifp->flags & IFA_F_OPTIMISTIC)
95c385b4
NH		 2890 ip6_ins_rt(ifp->rt);
2891
6732bade 2892 addrconf_dad_kick(ifp);
21809faf 2893 spin_unlock(&ifp->lock);
1da177e4
LT		 2894out:
2895 read_unlock_bh(&idev->lock);
2896}
2897
2898static void addrconf_dad_timer(unsigned long data)
2899{
2900 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2901 struct inet6_dev *idev = ifp->idev;
1da177e4
LT		 2902 struct in6_addr mcaddr;
2903
f2344a13
HX		 2904 if (!ifp->probes && addrconf_dad_end(ifp))
2905 goto out;
2906
122e4519 2907 read_lock(&idev->lock);
2908 if (idev->dead || !(idev->if_flags & IF_READY)) {
2909 read_unlock(&idev->lock);
1da177e4
LT		 2910 goto out;
2911 }
21809faf 2912
2913 spin_lock(&ifp->lock);
1da177e4
LT		 2914 if (ifp->probes == 0) {
2915 /*
2916 * DAD was successful
2917 */
2918
cc411d0b 2919 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
21809faf 2920 spin_unlock(&ifp->lock);
122e4519 2921 read_unlock(&idev->lock);
1da177e4
LT		 2922
2923 addrconf_dad_completed(ifp);
2924
2925 goto out;
2926 }
2927
2928 ifp->probes--;
2929 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
21809faf 2930 spin_unlock(&ifp->lock);
122e4519 2931 read_unlock(&idev->lock);
1da177e4
LT		 2932
2933 /* send a neighbour solicitation for our addr */
1da177e4 2934 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
d7aabf22 2935 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
1da177e4
LT		 2936out:
2937 in6_ifa_put(ifp);
2938}
2939
2940static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2941{
e21e8467 2942 struct net_device *dev = ifp->idev->dev;
1da177e4
LT		 2943
2944 /*
2945 * Configure the address for reception. Now it is valid.
2946 */
2947
2948 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2949
2950 /* If added prefix is link local and forwarding is off,
2951 start sending router solicitations.
2952 */
2953
2954 if (ifp->idev->cnf.forwarding == 0 &&
2955 ifp->idev->cnf.rtr_solicits > 0 &&
2956 (dev->flags&IFF_LOOPBACK) == 0 &&
2957 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 2958 /*
2959 * If a host as already performed a random delay
2960 * [...] as part of DAD [...] there is no need
2961 * to delay again before sending the first RS
2962 */
f3ee4010 2963 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
1da177e4
LT		 2964
2965 spin_lock_bh(&ifp->lock);
2966 ifp->probes = 1;
2967 ifp->idev->if_flags |= IF_RS_SENT;
2968 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2969 spin_unlock_bh(&ifp->lock);
2970 }
2971}
2972
e21e8467
SH		 2973static void addrconf_dad_run(struct inet6_dev *idev)
2974{
c5e33bdd
YH		 2975 struct inet6_ifaddr *ifp;
2976
2977 read_lock_bh(&idev->lock);
502a2ffd 2978 list_for_each_entry(ifp, &idev->addr_list, if_list) {
21809faf 2979 spin_lock(&ifp->lock);
f2344a13
HX		 2980 if (ifp->flags & IFA_F_TENTATIVE &&
2981 ifp->state == INET6_IFADDR_STATE_DAD)
2982 addrconf_dad_kick(ifp);
21809faf 2983 spin_unlock(&ifp->lock);
c5e33bdd
YH		 2984 }
2985 read_unlock_bh(&idev->lock);
2986}
2987
1da177e4
LT		 2988#ifdef CONFIG_PROC_FS
2989struct if6_iter_state {
3c40090a 2990 struct seq_net_private p;
1da177e4
LT		 2991 int bucket;
2992};
2993
2994static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2995{
2996 struct inet6_ifaddr *ifa = NULL;
2997 struct if6_iter_state *state = seq->private;
1218854a 2998 struct net *net = seq_file_net(seq);
1da177e4
LT		 2999
3000 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
c2e21293 3001 struct hlist_node *n;
4f70ecca 3002 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
5c578aed 3003 addr_lst)
c2e21293 3004 if (net_eq(dev_net(ifa->idev->dev), net))
3005 return ifa;
1da177e4 3006 }
c2e21293 3007 return NULL;
1da177e4
LT		 3008}
3009
c2e21293 3010static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3011 struct inet6_ifaddr *ifa)
1da177e4
LT		 3012{
3013 struct if6_iter_state *state = seq->private;
1218854a 3014 struct net *net = seq_file_net(seq);
c2e21293 3015 struct hlist_node *n = &ifa->addr_lst;
1da177e4 3016
4f70ecca 3017 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
c2e21293 3018 if (net_eq(dev_net(ifa->idev->dev), net))
3019 return ifa;
3c40090a 3020
c2e21293 3021 while (++state->bucket < IN6_ADDR_HSIZE) {
4f70ecca 3022 hlist_for_each_entry_rcu_bh(ifa, n,
c2e21293 3023 &inet6_addr_lst[state->bucket], addr_lst) {
3024 if (net_eq(dev_net(ifa->idev->dev), net))
3025 return ifa;
3026 }
1da177e4 3027 }
3c40090a 3028
c2e21293 3029 return NULL;
1da177e4
LT		 3030}
3031
3032static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3033{
3034 struct inet6_ifaddr *ifa = if6_get_first(seq);
3035
3036 if (ifa)
e21e8467 3037 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
1da177e4
LT		 3038 --pos;
3039 return pos ? NULL : ifa;
3040}
3041
3042static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4f70ecca 3043 __acquires(rcu_bh)
1da177e4 3044{
5c578aed 3045 rcu_read_lock_bh();
1da177e4
LT		 3046 return if6_get_idx(seq, *pos);
3047}
3048
3049static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3050{
3051 struct inet6_ifaddr *ifa;
3052
3053 ifa = if6_get_next(seq, v);
3054 ++*pos;
3055 return ifa;
3056}
3057
3058static void if6_seq_stop(struct seq_file *seq, void *v)
4f70ecca 3059 __releases(rcu_bh)
1da177e4 3060{
5c578aed 3061 rcu_read_unlock_bh();
1da177e4
LT		 3062}
3063
3064static int if6_seq_show(struct seq_file *seq, void *v)
3065{
3066 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4b7a4274 3067 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
b071195d 3068 &ifp->addr,
1da177e4
LT		 3069 ifp->idev->dev->ifindex,
3070 ifp->prefix_len,
3071 ifp->scope,
3072 ifp->flags,
3073 ifp->idev->dev->name);
3074 return 0;
3075}
3076
56b3d975 3077static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 3078 .start = if6_seq_start,
3079 .next = if6_seq_next,
3080 .show = if6_seq_show,
3081 .stop = if6_seq_stop,
3082};
3083
3084static int if6_seq_open(struct inode *inode, struct file *file)
3085{
3c40090a
DL		 3086 return seq_open_net(inode, file, &if6_seq_ops,
3087 sizeof(struct if6_iter_state));
1da177e4
LT		 3088}
3089
9a32144e 3090static const struct file_operations if6_fops = {
1da177e4
LT		 3091 .owner = THIS_MODULE,
3092 .open = if6_seq_open,
3093 .read = seq_read,
3094 .llseek = seq_lseek,
3c40090a 3095 .release = seq_release_net,
1da177e4
LT		 3096};
3097
2c8c1e72 3098static int __net_init if6_proc_net_init(struct net *net)
1da177e4 3099{
3c40090a 3100 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 3101 return -ENOMEM;
3102 return 0;
3103}
3104
2c8c1e72 3105static void __net_exit if6_proc_net_exit(struct net *net)
3c40090a
DL		 3106{
3107 proc_net_remove(net, "if_inet6");
3108}
3109
3110static struct pernet_operations if6_proc_net_ops = {
3111 .init = if6_proc_net_init,
3112 .exit = if6_proc_net_exit,
3113};
3114
3115int __init if6_proc_init(void)
3116{
3117 return register_pernet_subsys(&if6_proc_net_ops);
3118}
3119
1da177e4
LT		 3120void if6_proc_exit(void)
3121{
3c40090a 3122 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 3123}
3124#endif /* CONFIG_PROC_FS */
3125
59fbb3a6 3126#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 3127/* Check if address is a home address configured on any interface. */
389f6612 3128int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 3129{
3130 int ret = 0;
c2e21293 3131 struct inet6_ifaddr *ifp = NULL;
3132 struct hlist_node *n;
3a88a81d 3133 unsigned int hash = ipv6_addr_hash(addr);
c2e21293 3134
5c578aed 3135 rcu_read_lock_bh();
4f70ecca 3136 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
878628fb 3137 if (!net_eq(dev_net(ifp->idev->dev), net))
389f6612 3138 continue;
caad295f 3139 if (ipv6_addr_equal(&ifp->addr, addr) &&
3b9f9a1c
NT		 3140 (ifp->flags & IFA_F_HOMEADDRESS)) {
3141 ret = 1;
3142 break;
3143 }
3144 }
5c578aed 3145 rcu_read_unlock_bh();
3b9f9a1c
NT		 3146 return ret;
3147}
3148#endif
3149
1da177e4
LT		 3150/*
3151 * Periodic address status verification
3152 */
3153
3154static void addrconf_verify(unsigned long foo)
3155{
b2db7564 3156 unsigned long now, next, next_sec, next_sched;
1da177e4 3157 struct inet6_ifaddr *ifp;
c2e21293 3158 struct hlist_node *node;
1da177e4
LT		 3159 int i;
3160
5c578aed 3161 rcu_read_lock_bh();
3162 spin_lock(&addrconf_verify_lock);
1da177e4 3163 now = jiffies;
b2db7564 3164 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
1da177e4
LT		 3165
3166 del_timer(&addr_chk_timer);
3167
bcdd553f 3168 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
1da177e4 3169restart:
4f70ecca 3170 hlist_for_each_entry_rcu_bh(ifp, node,
5c578aed 3171 &inet6_addr_lst[i], addr_lst) {
1da177e4 3172 unsigned long age;
1da177e4
LT		 3173
3174 if (ifp->flags & IFA_F_PERMANENT)
3175 continue;
3176
3177 spin_lock(&ifp->lock);
b2db7564
YH		 3178 /* We try to batch several events at once. */
3179 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1da177e4 3180
8f27ebb9
YH		 3181 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3182 age >= ifp->valid_lft) {
1da177e4
LT		 3183 spin_unlock(&ifp->lock);
3184 in6_ifa_hold(ifp);
1da177e4
LT		 3185 ipv6_del_addr(ifp);
3186 goto restart;
8f27ebb9
YH		 3187 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3188 spin_unlock(&ifp->lock);
3189 continue;
1da177e4 3190 } else if (age >= ifp->prefered_lft) {
a1ed0526 3191 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
1da177e4
LT		 3192 int deprecate = 0;
3193
3194 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3195 deprecate = 1;
3196 ifp->flags |= IFA_F_DEPRECATED;
3197 }
3198
3199 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3200 next = ifp->tstamp + ifp->valid_lft * HZ;
3201
3202 spin_unlock(&ifp->lock);
3203
3204 if (deprecate) {
3205 in6_ifa_hold(ifp);
1da177e4
LT		 3206
3207 ipv6_ifa_notify(0, ifp);
3208 in6_ifa_put(ifp);
3209 goto restart;
3210 }
3211#ifdef CONFIG_IPV6_PRIVACY
3212 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3213 !(ifp->flags&IFA_F_TENTATIVE)) {
88949cf4 3214 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3215 ifp->idev->cnf.dad_transmits *
3216 ifp->idev->nd_parms->retrans_time / HZ;
3217
1da177e4
LT		 3218 if (age >= ifp->prefered_lft - regen_advance) {
3219 struct inet6_ifaddr *ifpub = ifp->ifpub;
3220 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3221 next = ifp->tstamp + ifp->prefered_lft * HZ;
3222 if (!ifp->regen_count && ifpub) {
3223 ifp->regen_count++;
3224 in6_ifa_hold(ifp);
3225 in6_ifa_hold(ifpub);
3226 spin_unlock(&ifp->lock);
5c578aed 3227
291d809b
HY		 3228 spin_lock(&ifpub->lock);
3229 ifpub->regen_count = 0;
3230 spin_unlock(&ifpub->lock);
1da177e4
LT		 3231 ipv6_create_tempaddr(ifpub, ifp);
3232 in6_ifa_put(ifpub);
3233 in6_ifa_put(ifp);
3234 goto restart;
3235 }
3236 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3237 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3238 spin_unlock(&ifp->lock);
3239#endif
3240 } else {
3241 /* ifp->prefered_lft <= ifp->valid_lft */
3242 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3243 next = ifp->tstamp + ifp->prefered_lft * HZ;
3244 spin_unlock(&ifp->lock);
3245 }
3246 }
1da177e4
LT		 3247 }
3248
b2db7564
YH		 3249 next_sec = round_jiffies_up(next);
3250 next_sched = next;
3251
3252 /* If rounded timeout is accurate enough, accept it. */
3253 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3254 next_sched = next_sec;
3255
3256 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3257 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3258 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3259
3260 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3261 now, next, next_sec, next_sched));
3262
3263 addr_chk_timer.expires = next_sched;
1da177e4 3264 add_timer(&addr_chk_timer);
5c578aed 3265 spin_unlock(&addrconf_verify_lock);
3266 rcu_read_unlock_bh();
1da177e4
LT		 3267}
3268
461d8837
TG		 3269static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3270{
3271 struct in6_addr *pfx = NULL;
3272
3273 if (addr)
3274 pfx = nla_data(addr);
3275
3276 if (local) {
3277 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3278 pfx = NULL;
3279 else
3280 pfx = nla_data(local);
3281 }
3282
3283 return pfx;
3284}
3285
ef7c79ed 3286static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3287 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3288 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3289 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3290};
3291
1da177e4
LT		 3292static int
3293inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3294{
3b1e0a65 3295 struct net *net = sock_net(skb->sk);
b933f716
TG		 3296 struct ifaddrmsg *ifm;
3297 struct nlattr *tb[IFA_MAX+1];
1da177e4 3298 struct in6_addr *pfx;
b933f716 3299 int err;
1da177e4 3300
b933f716
TG		 3301 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3302 if (err < 0)
3303 return err;
3304
3305 ifm = nlmsg_data(nlh);
3306 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3307 if (pfx == NULL)
3308 return -EINVAL;
3309
af284937 3310 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
1da177e4
LT		 3311}
3312
55ebaef1
NT		 3313static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3314 u32 prefered_lft, u32 valid_lft)
081bba5b 3315{
6f704992
YH		 3316 u32 flags;
3317 clock_t expires;
4bed72e4 3318 unsigned long timeout;
46d48046 3319
081bba5b
NT		 3320 if (!valid_lft || (prefered_lft > valid_lft))
3321 return -EINVAL;
3322
4bed72e4
YH		 3323 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3324 if (addrconf_finite_timeout(timeout)) {
3325 expires = jiffies_to_clock_t(timeout * HZ);
3326 valid_lft = timeout;
6f704992 3327 flags = RTF_EXPIRES;
4bed72e4
YH		 3328 } else {
3329 expires = 0;
3330 flags = 0;
3331 ifa_flags |= IFA_F_PERMANENT;
6f704992 3332 }
081bba5b 3333
4bed72e4
YH		 3334 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3335 if (addrconf_finite_timeout(timeout)) {
3336 if (timeout == 0)
3337 ifa_flags |= IFA_F_DEPRECATED;
3338 prefered_lft = timeout;
3339 }
081bba5b
NT		 3340
3341 spin_lock_bh(&ifp->lock);
3b9f9a1c 3342 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3343 ifp->tstamp = jiffies;
3344 ifp->valid_lft = valid_lft;
3345 ifp->prefered_lft = prefered_lft;
3346
3347 spin_unlock_bh(&ifp->lock);
3348 if (!(ifp->flags&IFA_F_TENTATIVE))
3349 ipv6_ifa_notify(0, ifp);
081bba5b 3350
46d48046 3351 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
6f704992 3352 expires, flags);
081bba5b
NT		 3353 addrconf_verify(0);
3354
3355 return 0;
3356}
3357
1da177e4
LT		 3358static int
3359inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3360{
3b1e0a65 3361 struct net *net = sock_net(skb->sk);
461d8837
TG		 3362 struct ifaddrmsg *ifm;
3363 struct nlattr *tb[IFA_MAX+1];
1da177e4 3364 struct in6_addr *pfx;
7198f8ce
TG		 3365 struct inet6_ifaddr *ifa;
3366 struct net_device *dev;
55ebaef1
NT		 3367 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3368 u8 ifa_flags;
461d8837 3369 int err;
1da177e4 3370
461d8837
TG		 3371 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3372 if (err < 0)
3373 return err;
3374
3375 ifm = nlmsg_data(nlh);
3376 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3377 if (pfx == NULL)
3378 return -EINVAL;
3379
461d8837 3380 if (tb[IFA_CACHEINFO]) {
0778769d 3381 struct ifa_cacheinfo *ci;
461d8837
TG		 3382
3383 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3384 valid_lft = ci->ifa_valid;
461d8837
TG		 3385 preferred_lft = ci->ifa_prefered;
3386 } else {
3387 preferred_lft = INFINITY_LIFE_TIME;
3388 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3389 }
3390
af284937 3391 dev = __dev_get_by_index(net, ifm->ifa_index);
7198f8ce
TG		 3392 if (dev == NULL)
3393 return -ENODEV;
3394
55ebaef1 3395 /* We ignore other flags so far. */
3b9f9a1c 3396 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3397
1cab3da6 3398 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3399 if (ifa == NULL) {
3400 /*
3401 * It would be best to check for !NLM_F_CREATE here but
3402 * userspace alreay relies on not having to provide this.
3403 */
af284937
DL		 3404 return inet6_addr_add(net, ifm->ifa_index, pfx,
3405 ifm->ifa_prefixlen, ifa_flags,
3406 preferred_lft, valid_lft);
081bba5b
NT		 3407 }
3408
7198f8ce
TG		 3409 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3410 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3411 err = -EEXIST;
3412 else
55ebaef1 3413 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3414
3415 in6_ifa_put(ifa);
3416
3417 return err;
1da177e4
LT		 3418}
3419
101bb229
TG		 3420static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3421 u8 scope, int ifindex)
3422{
3423 struct ifaddrmsg *ifm;
3424
3425 ifm = nlmsg_data(nlh);
3426 ifm->ifa_family = AF_INET6;
3427 ifm->ifa_prefixlen = prefixlen;
3428 ifm->ifa_flags = flags;
3429 ifm->ifa_scope = scope;
3430 ifm->ifa_index = ifindex;
3431}
3432
85486af0
TG		 3433static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3434 unsigned long tstamp, u32 preferred, u32 valid)
3435{
3436 struct ifa_cacheinfo ci;
3437
3438 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3439 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3440 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3441 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3442 ci.ifa_prefered = preferred;
3443 ci.ifa_valid = valid;
3444
3445 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3446}
3447
101bb229
TG		 3448static inline int rt_scope(int ifa_scope)
3449{
3450 if (ifa_scope & IFA_HOST)
3451 return RT_SCOPE_HOST;
3452 else if (ifa_scope & IFA_LINK)
3453 return RT_SCOPE_LINK;
3454 else if (ifa_scope & IFA_SITE)
3455 return RT_SCOPE_SITE;
3456 else
3457 return RT_SCOPE_UNIVERSE;
3458}
3459
0ab6803b
TG		 3460static inline int inet6_ifaddr_msgsize(void)
3461{
339bf98f
TG		 3462 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3463 + nla_total_size(16) /* IFA_ADDRESS */
3464 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3465}
c5396a31 3466
1da177e4 3467static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3468 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3469{
1da177e4 3470 struct nlmsghdr *nlh;
85486af0 3471 u32 preferred, valid;
1da177e4 3472
0ab6803b
TG		 3473 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3474 if (nlh == NULL)
26932566 3475 return -EMSGSIZE;
0ab6803b 3476
101bb229
TG		 3477 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3478 ifa->idev->dev->ifindex);
3479
1da177e4 3480 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3481 preferred = ifa->prefered_lft;
3482 valid = ifa->valid_lft;
3483 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3484 long tval = (jiffies - ifa->tstamp)/HZ;
a1faa698
JR		 3485 if (preferred > tval)
3486 preferred -= tval;
3487 else
3488 preferred = 0;
85486af0
TG		 3489 if (valid != INFINITY_LIFE_TIME)
3490 valid -= tval;
1da177e4
LT		 3491 }
3492 } else {
85486af0
TG		 3493 preferred = INFINITY_LIFE_TIME;
3494 valid = INFINITY_LIFE_TIME;
3495 }
3496
0ab6803b 3497 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3498 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3499 nlmsg_cancel(skb, nlh);
3500 return -EMSGSIZE;
3501 }
1da177e4 3502
0ab6803b 3503 return nlmsg_end(skb, nlh);
1da177e4
LT		 3504}
3505
3506static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3507 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3508{
1da177e4 3509 struct nlmsghdr *nlh;
101bb229
TG		 3510 u8 scope = RT_SCOPE_UNIVERSE;
3511 int ifindex = ifmca->idev->dev->ifindex;
3512
3513 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3514 scope = RT_SCOPE_SITE;
1da177e4 3515
0ab6803b
TG		 3516 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3517 if (nlh == NULL)
26932566 3518 return -EMSGSIZE;
85486af0 3519
0ab6803b
TG		 3520 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3521 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3522 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3523 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3524 nlmsg_cancel(skb, nlh);
3525 return -EMSGSIZE;
3526 }
85486af0 3527
0ab6803b 3528 return nlmsg_end(skb, nlh);
1da177e4
LT		 3529}
3530
3531static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3532 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3533{
1da177e4 3534 struct nlmsghdr *nlh;
101bb229
TG		 3535 u8 scope = RT_SCOPE_UNIVERSE;
3536 int ifindex = ifaca->aca_idev->dev->ifindex;
3537
3538 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3539 scope = RT_SCOPE_SITE;
1da177e4 3540
0ab6803b
TG		 3541 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3542 if (nlh == NULL)
26932566 3543 return -EMSGSIZE;
85486af0 3544
0ab6803b
TG		 3545 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3546 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3547 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3548 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3549 nlmsg_cancel(skb, nlh);
3550 return -EMSGSIZE;
3551 }
1da177e4 3552
0ab6803b 3553 return nlmsg_end(skb, nlh);
1da177e4
LT		 3554}
3555
e21e8467 3556enum addr_type_t {
1da177e4
LT		 3557 UNICAST_ADDR,
3558 MULTICAST_ADDR,
3559 ANYCAST_ADDR,
3560};
3561
234b27c3
ED		 3562/* called with rcu_read_lock() */
3563static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3564 struct netlink_callback *cb, enum addr_type_t type,
3565 int s_ip_idx, int *p_ip_idx)
3566{
234b27c3
ED		 3567 struct ifmcaddr6 *ifmca;
3568 struct ifacaddr6 *ifaca;
3569 int err = 1;
3570 int ip_idx = *p_ip_idx;
3571
3572 read_lock_bh(&idev->lock);
3573 switch (type) {
502a2ffd 3574 case UNICAST_ADDR: {
3575 struct inet6_ifaddr *ifa;
3576
234b27c3 3577 /* unicast address incl. temp addr */
502a2ffd 3578 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3579 if (++ip_idx < s_ip_idx)
234b27c3
ED		 3580 continue;
3581 err = inet6_fill_ifaddr(skb, ifa,
3582 NETLINK_CB(cb->skb).pid,
3583 cb->nlh->nlmsg_seq,
3584 RTM_NEWADDR,
3585 NLM_F_MULTI);
3586 if (err <= 0)
3587 break;
3588 }
3589 break;
502a2ffd 3590 }
234b27c3
ED		 3591 case MULTICAST_ADDR:
3592 /* multicast address */
3593 for (ifmca = idev->mc_list; ifmca;
3594 ifmca = ifmca->next, ip_idx++) {
3595 if (ip_idx < s_ip_idx)
3596 continue;
3597 err = inet6_fill_ifmcaddr(skb, ifmca,
3598 NETLINK_CB(cb->skb).pid,
3599 cb->nlh->nlmsg_seq,
3600 RTM_GETMULTICAST,
3601 NLM_F_MULTI);
3602 if (err <= 0)
3603 break;
3604 }
3605 break;
3606 case ANYCAST_ADDR:
3607 /* anycast address */
3608 for (ifaca = idev->ac_list; ifaca;
3609 ifaca = ifaca->aca_next, ip_idx++) {
3610 if (ip_idx < s_ip_idx)
3611 continue;
3612 err = inet6_fill_ifacaddr(skb, ifaca,
3613 NETLINK_CB(cb->skb).pid,
3614 cb->nlh->nlmsg_seq,
3615 RTM_GETANYCAST,
3616 NLM_F_MULTI);
3617 if (err <= 0)
3618 break;
3619 }
3620 break;
3621 default:
3622 break;
3623 }
3624 read_unlock_bh(&idev->lock);
3625 *p_ip_idx = ip_idx;
3626 return err;
3627}
3628
1da177e4
LT		 3629static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3630 enum addr_type_t type)
3631{
234b27c3
ED		 3632 struct net *net = sock_net(skb->sk);
3633 int h, s_h;
1da177e4
LT		 3634 int idx, ip_idx;
3635 int s_idx, s_ip_idx;
1da177e4 3636 struct net_device *dev;
234b27c3
ED		 3637 struct inet6_dev *idev;
3638 struct hlist_head *head;
3639 struct hlist_node *node;
1ab1457c 3640
234b27c3
ED		 3641 s_h = cb->args[0];
3642 s_idx = idx = cb->args[1];
3643 s_ip_idx = ip_idx = cb->args[2];
5d5619b4 3644
234b27c3
ED		 3645 rcu_read_lock();
3646 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3647 idx = 0;
3648 head = &net->dev_index_head[h];
3649 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3650 if (idx < s_idx)
3651 goto cont;
4b97efdf 3652 if (h > s_h || idx > s_idx)
234b27c3
ED		 3653 s_ip_idx = 0;
3654 ip_idx = 0;
e21e8467
SH		 3655 idev = __in6_dev_get(dev);
3656 if (!idev)
234b27c3
ED		 3657 goto cont;
3658
3659 if (in6_dump_addrs(idev, skb, cb, type,
3660 s_ip_idx, &ip_idx) <= 0)
3661 goto done;
7562f876 3662cont:
234b27c3
ED		 3663 idx++;
3664 }
1da177e4 3665 }
234b27c3
ED		 3666done:
3667 rcu_read_unlock();
3668 cb->args[0] = h;
3669 cb->args[1] = idx;
3670 cb->args[2] = ip_idx;
3671
1da177e4
LT		 3672 return skb->len;
3673}
3674
3675static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3676{
3677 enum addr_type_t type = UNICAST_ADDR;
b854272b 3678
1da177e4
LT		 3679 return inet6_dump_addr(skb, cb, type);
3680}
3681
3682static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3683{
3684 enum addr_type_t type = MULTICAST_ADDR;
b854272b 3685
1da177e4
LT		 3686 return inet6_dump_addr(skb, cb, type);
3687}
3688
3689
3690static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3691{
3692 enum addr_type_t type = ANYCAST_ADDR;
b854272b 3693
1da177e4
LT		 3694 return inet6_dump_addr(skb, cb, type);
3695}
3696
1b29fc2c
TG		 3697static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3698 void *arg)
6c223828 3699{
3b1e0a65 3700 struct net *net = sock_net(in_skb->sk);
1b29fc2c
TG		 3701 struct ifaddrmsg *ifm;
3702 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3703 struct in6_addr *addr = NULL;
3704 struct net_device *dev = NULL;
3705 struct inet6_ifaddr *ifa;
3706 struct sk_buff *skb;
6c223828
NT		 3707 int err;
3708
1b29fc2c
TG		 3709 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3710 if (err < 0)
3711 goto errout;
3712
3713 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3714 if (addr == NULL) {
3715 err = -EINVAL;
3716 goto errout;
6c223828 3717 }
6c223828 3718
1b29fc2c 3719 ifm = nlmsg_data(nlh);
6c223828 3720 if (ifm->ifa_index)
6fda7350 3721 dev = __dev_get_by_index(net, ifm->ifa_index);
6c223828 3722
e21e8467
SH		 3723 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3724 if (!ifa) {
1b29fc2c
TG		 3725 err = -EADDRNOTAVAIL;
3726 goto errout;
3727 }
6c223828 3728
e21e8467
SH		 3729 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3730 if (!skb) {
6c223828 3731 err = -ENOBUFS;
1b29fc2c 3732 goto errout_ifa;
6c223828
NT		 3733 }
3734
6c223828
NT		 3735 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3736 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3737 if (err < 0) {
3738 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3739 WARN_ON(err == -EMSGSIZE);
3740 kfree_skb(skb);
3741 goto errout_ifa;
3742 }
6fda7350 3743 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
1b29fc2c 3744errout_ifa:
6c223828 3745 in6_ifa_put(ifa);
1b29fc2c 3746errout:
6c223828 3747 return err;
6c223828
NT		 3748}
3749
1da177e4
LT		 3750static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3751{
3752 struct sk_buff *skb;
c346dca1 3753 struct net *net = dev_net(ifa->idev->dev);
5d620266 3754 int err = -ENOBUFS;
1da177e4 3755
0ab6803b 3756 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3757 if (skb == NULL)
3758 goto errout;
3759
3760 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3761 if (err < 0) {
3762 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3763 WARN_ON(err == -EMSGSIZE);
3764 kfree_skb(skb);
3765 goto errout;
3766 }
1ce85fe4
PNA		 3767 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3768 return;
5d620266
TG		 3769errout:
3770 if (err < 0)
6fda7350 3771 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3772}
3773
b6f99a21 3774static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3775 __s32 *array, int bytes)
3776{
04561c1f
TG		 3777 BUG_ON(bytes < (DEVCONF_MAX * 4));
3778
1da177e4
LT		 3779 memset(array, 0, bytes);
3780 array[DEVCONF_FORWARDING] = cnf->forwarding;
3781 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3782 array[DEVCONF_MTU6] = cnf->mtu6;
3783 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3784 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3785 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3786 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3787 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3788 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3789 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3790 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3791#ifdef CONFIG_IPV6_PRIVACY
3792 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3793 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3794 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3795 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3796 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3797#endif
3798 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3799 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3800 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3801#ifdef CONFIG_IPV6_ROUTER_PREF
3802 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3803 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3804#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3805 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3806#endif
930d6ff2 3807#endif
fbea49e1 3808 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3809 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3810#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3811 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3812#endif
7bc570c8
YH		 3813#ifdef CONFIG_IPV6_MROUTE
3814 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3815#endif
778d80be 3816 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
1b34be74 3817 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
c3faca05 3818 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
1da177e4
LT		 3819}
3820
339bf98f
TG		 3821static inline size_t inet6_if_nlmsg_size(void)
3822{
3823 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3824 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3825 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3826 + nla_total_size(4) /* IFLA_MTU */
3827 + nla_total_size(4) /* IFLA_LINK */
3828 + nla_total_size( /* IFLA_PROTINFO */
3829 nla_total_size(4) /* IFLA_INET6_FLAGS */
3830 + nla_total_size(sizeof(struct ifla_cacheinfo))
3831 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3832 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3833 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3834 );
3835}
c5396a31 3836
7d720c3e
TH		 3837static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3838 int items, int bytes)
7f7d9a6b
HX		 3839{
3840 int i;
3841 int pad = bytes - sizeof(u64) * items;
3842 BUG_ON(pad < 0);
3843
3844 /* Use put_unaligned() because stats may not be aligned for u64. */
3845 put_unaligned(items, &stats[0]);
3846 for (i = 1; i < items; i++)
3847 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3848
3849 memset(&stats[items], 0, pad);
3850}
3851
3852static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3853 int bytes)
3854{
e21e8467 3855 switch (attrtype) {
7f7d9a6b 3856 case IFLA_INET6_STATS:
7d720c3e 3857 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
7f7d9a6b
HX		 3858 break;
3859 case IFLA_INET6_ICMP6STATS:
7d720c3e 3860 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
7f7d9a6b
HX		 3861 break;
3862 }
3863}
3864
1ab1457c 3865static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3866 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3867{
04561c1f 3868 struct net_device *dev = idev->dev;
bf99f1bd 3869 struct nlattr *nla;
04561c1f
TG		 3870 struct ifinfomsg *hdr;
3871 struct nlmsghdr *nlh;
3872 void *protoinfo;
3873 struct ifla_cacheinfo ci;
3874
3875 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3876 if (nlh == NULL)
26932566 3877 return -EMSGSIZE;
04561c1f
TG		 3878
3879 hdr = nlmsg_data(nlh);
3880 hdr->ifi_family = AF_INET6;
3881 hdr->__ifi_pad = 0;
3882 hdr->ifi_type = dev->type;
3883 hdr->ifi_index = dev->ifindex;
3884 hdr->ifi_flags = dev_get_flags(dev);
3885 hdr->ifi_change = 0;
3886
3887 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3888
3889 if (dev->addr_len)
04561c1f 3890 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3891
04561c1f 3892 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3893 if (dev->ifindex != dev->iflink)
04561c1f 3894 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3895
04561c1f
TG		 3896 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3897 if (protoinfo == NULL)
3898 goto nla_put_failure;
1da177e4 3899
04561c1f 3900 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3901
1da177e4
LT		 3902 ci.max_reasm_len = IPV6_MAXPLEN;
3903 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3904 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3905 ci.reachable_time = idev->nd_parms->reachable_time;
3906 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3907 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3908
bf99f1bd
YH		 3909 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3910 if (nla == NULL)
04561c1f 3911 goto nla_put_failure;
bf99f1bd 3912 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3913
bf99f1bd
YH		 3914 /* XXX - MC not implemented */
3915
3916 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3917 if (nla == NULL)
3918 goto nla_put_failure;
3919 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3920
3921 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3922 if (nla == NULL)
3923 goto nla_put_failure;
3924 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3925
04561c1f
TG		 3926 nla_nest_end(skb, protoinfo);
3927 return nlmsg_end(skb, nlh);
1da177e4 3928
04561c1f 3929nla_put_failure:
26932566
PM		 3930 nlmsg_cancel(skb, nlh);
3931 return -EMSGSIZE;
1da177e4
LT		 3932}
3933
3934static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3935{
3b1e0a65 3936 struct net *net = sock_net(skb->sk);
84d2697d 3937 int h, s_h;
434a8a58 3938 int idx = 0, s_idx;
1da177e4
LT		 3939 struct net_device *dev;
3940 struct inet6_dev *idev;
84d2697d
ED		 3941 struct hlist_head *head;
3942 struct hlist_node *node;
1da177e4 3943
84d2697d
ED		 3944 s_h = cb->args[0];
3945 s_idx = cb->args[1];
3946
3947 rcu_read_lock();
3948 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3949 idx = 0;
3950 head = &net->dev_index_head[h];
3951 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3952 if (idx < s_idx)
3953 goto cont;
3954 idev = __in6_dev_get(dev);
3955 if (!idev)
3956 goto cont;
3957 if (inet6_fill_ifinfo(skb, idev,
3958 NETLINK_CB(cb->skb).pid,
3959 cb->nlh->nlmsg_seq,
3960 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3961 goto out;
7562f876 3962cont:
84d2697d
ED		 3963 idx++;
3964 }
1da177e4 3965 }
84d2697d
ED		 3966out:
3967 rcu_read_unlock();
3968 cb->args[1] = idx;
3969 cb->args[0] = h;
1da177e4
LT		 3970
3971 return skb->len;
3972}
3973
3974void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3975{
3976 struct sk_buff *skb;
c346dca1 3977 struct net *net = dev_net(idev->dev);
8d7a76c9 3978 int err = -ENOBUFS;
1ab1457c 3979
339bf98f 3980 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3981 if (skb == NULL)
3982 goto errout;
3983
3984 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3985 if (err < 0) {
3986 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3987 WARN_ON(err == -EMSGSIZE);
3988 kfree_skb(skb);
3989 goto errout;
3990 }
1ce85fe4
PNA		 3991 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3992 return;
8d7a76c9
TG		 3993errout:
3994 if (err < 0)
6fda7350 3995 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3996}
3997
339bf98f
TG		 3998static inline size_t inet6_prefix_nlmsg_size(void)
3999{
4000 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4001 + nla_total_size(sizeof(struct in6_addr))
4002 + nla_total_size(sizeof(struct prefix_cacheinfo));
4003}
c5396a31 4004
1da177e4 4005static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 4006 struct prefix_info *pinfo, u32 pid, u32 seq,
4007 int event, unsigned int flags)
1da177e4 4008{
6051e2f4
TG		 4009 struct prefixmsg *pmsg;
4010 struct nlmsghdr *nlh;
1da177e4
LT		 4011 struct prefix_cacheinfo ci;
4012
6051e2f4
TG		 4013 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4014 if (nlh == NULL)
26932566 4015 return -EMSGSIZE;
6051e2f4
TG		 4016
4017 pmsg = nlmsg_data(nlh);
1da177e4 4018 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 4019 pmsg->prefix_pad1 = 0;
4020 pmsg->prefix_pad2 = 0;
1da177e4
LT		 4021 pmsg->prefix_ifindex = idev->dev->ifindex;
4022 pmsg->prefix_len = pinfo->prefix_len;
4023 pmsg->prefix_type = pinfo->type;
8a47077a 4024 pmsg->prefix_pad3 = 0;
1da177e4
LT		 4025 pmsg->prefix_flags = 0;
4026 if (pinfo->onlink)
4027 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4028 if (pinfo->autoconf)
4029 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4030
6051e2f4 4031 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 4032
4033 ci.preferred_time = ntohl(pinfo->prefered);
4034 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 4035 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 4036
6051e2f4 4037 return nlmsg_end(skb, nlh);
1da177e4 4038
6051e2f4 4039nla_put_failure:
26932566
PM		 4040 nlmsg_cancel(skb, nlh);
4041 return -EMSGSIZE;
1da177e4
LT		 4042}
4043
1ab1457c 4044static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 4045 struct prefix_info *pinfo)
4046{
4047 struct sk_buff *skb;
c346dca1 4048 struct net *net = dev_net(idev->dev);
8c384bfa 4049 int err = -ENOBUFS;
1da177e4 4050
339bf98f 4051 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 4052 if (skb == NULL)
4053 goto errout;
4054
4055 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 4056 if (err < 0) {
4057 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4058 WARN_ON(err == -EMSGSIZE);
4059 kfree_skb(skb);
4060 goto errout;
4061 }
1ce85fe4
PNA		 4062 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4063 return;
8c384bfa
TG		 4064errout:
4065 if (err < 0)
6fda7350 4066 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 4067}
4068
1da177e4
LT		 4069static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4070{
4071 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4072
4073 switch (event) {
4074 case RTM_NEWADDR:
95c385b4
NH		 4075 /*
4076 * If the address was optimistic
4077 * we inserted the route at the start of
4078 * our DAD process, so we don't need
4079 * to do it again
4080 */
4081 if (!(ifp->rt->rt6i_node))
4082 ip6_ins_rt(ifp->rt);
1da177e4
LT		 4083 if (ifp->idev->cnf.forwarding)
4084 addrconf_join_anycast(ifp);
4085 break;
4086 case RTM_DELADDR:
4087 if (ifp->idev->cnf.forwarding)
4088 addrconf_leave_anycast(ifp);
4089 addrconf_leave_solict(ifp->idev, &ifp->addr);
4090 dst_hold(&ifp->rt->u.dst);
93fa159a 4091
e9d3e084
HX		 4092 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4093 ip6_del_rt(ifp->rt))
1da177e4 4094 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 4095 break;
4096 }
4097}
4098
4099static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4100{
8814c4b5 4101 rcu_read_lock_bh();
1da177e4
LT		 4102 if (likely(ifp->idev->dead == 0))
4103 __ipv6_ifa_notify(event, ifp);
8814c4b5 4104 rcu_read_unlock_bh();
1da177e4
LT		 4105}
4106
4107#ifdef CONFIG_SYSCTL
4108
4109static
8d65af78 4110int addrconf_sysctl_forward(ctl_table *ctl, int write,
1da177e4
LT		 4111 void __user *buffer, size_t *lenp, loff_t *ppos)
4112{
4113 int *valp = ctl->data;
4114 int val = *valp;
88af182e 4115 loff_t pos = *ppos;
1da177e4
LT		 4116 int ret;
4117
8d65af78 4118 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1da177e4 4119
c8fecf22 4120 if (write)
b325fddb 4121 ret = addrconf_fixup_forwarding(ctl, valp, val);
88af182e
EB		 4122 if (ret)
4123 *ppos = pos;
1ab1457c 4124 return ret;
1da177e4
LT		 4125}
4126
56d417b1
BH		 4127static void dev_disable_change(struct inet6_dev *idev)
4128{
4129 if (!idev || !idev->dev)
4130 return;
4131
4132 if (idev->cnf.disable_ipv6)
4133 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4134 else
4135 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4136}
4137
4138static void addrconf_disable_change(struct net *net, __s32 newf)
4139{
4140 struct net_device *dev;
4141 struct inet6_dev *idev;
4142
c6d14c84
ED		 4143 rcu_read_lock();
4144 for_each_netdev_rcu(net, dev) {
56d417b1
BH		 4145 idev = __in6_dev_get(dev);
4146 if (idev) {
4147 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4148 idev->cnf.disable_ipv6 = newf;
4149 if (changed)
4150 dev_disable_change(idev);
4151 }
56d417b1 4152 }
c6d14c84 4153 rcu_read_unlock();
56d417b1
BH		 4154}
4155
4156static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4157{
4158 struct net *net;
4159
4160 net = (struct net *)table->extra2;
4161
4162 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4163 return 0;
4164
88af182e
EB		 4165 if (!rtnl_trylock()) {
4166 /* Restore the original values before restarting */
4167 *p = old;
56d417b1 4168 return restart_syscall();
88af182e 4169 }
56d417b1
BH		 4170
4171 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4172 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4173 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4174 addrconf_disable_change(net, newf);
4175 } else if ((!*p) ^ (!old))
4176 dev_disable_change((struct inet6_dev *)table->extra1);
4177
4178 rtnl_unlock();
4179 return 0;
4180}
4181
4182static
8d65af78 4183int addrconf_sysctl_disable(ctl_table *ctl, int write,
56d417b1
BH		 4184 void __user *buffer, size_t *lenp, loff_t *ppos)
4185{
4186 int *valp = ctl->data;
4187 int val = *valp;
88af182e 4188 loff_t pos = *ppos;
56d417b1
BH		 4189 int ret;
4190
8d65af78 4191 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
56d417b1
BH		 4192
4193 if (write)
4194 ret = addrconf_disable_ipv6(ctl, valp, val);
88af182e
EB		 4195 if (ret)
4196 *ppos = pos;
56d417b1
BH		 4197 return ret;
4198}
4199
1da177e4
LT		 4200static struct addrconf_sysctl_table
4201{
4202 struct ctl_table_header *sysctl_header;
f6a07b29 4203 ctl_table addrconf_vars[DEVCONF_MAX+1];
1dab6222 4204 char *dev_name;
ab32ea5d 4205} addrconf_sysctl __read_mostly = {
1da177e4
LT		 4206 .sysctl_header = NULL,
4207 .addrconf_vars = {
1ab1457c 4208 {
e21e8467
SH		 4209 .procname = "forwarding",
4210 .data = &ipv6_devconf.forwarding,
4211 .maxlen = sizeof(int),
4212 .mode = 0644,
4213 .proc_handler = addrconf_sysctl_forward,
1da177e4
LT		 4214 },
4215 {
e21e8467
SH		 4216 .procname = "hop_limit",
4217 .data = &ipv6_devconf.hop_limit,
4218 .maxlen = sizeof(int),
4219 .mode = 0644,
4220 .proc_handler = proc_dointvec,
1da177e4
LT		 4221 },
4222 {
e21e8467
SH		 4223 .procname = "mtu",
4224 .data = &ipv6_devconf.mtu6,
4225 .maxlen = sizeof(int),
4226 .mode = 0644,
4227 .proc_handler = proc_dointvec,
1da177e4
LT		 4228 },
4229 {
e21e8467
SH		 4230 .procname = "accept_ra",
4231 .data = &ipv6_devconf.accept_ra,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
4234 .proc_handler = proc_dointvec,
1da177e4
LT		 4235 },
4236 {
e21e8467
SH		 4237 .procname = "accept_redirects",
4238 .data = &ipv6_devconf.accept_redirects,
4239 .maxlen = sizeof(int),
4240 .mode = 0644,
4241 .proc_handler = proc_dointvec,
1da177e4
LT		 4242 },
4243 {
e21e8467
SH		 4244 .procname = "autoconf",
4245 .data = &ipv6_devconf.autoconf,
4246 .maxlen = sizeof(int),
4247 .mode = 0644,
4248 .proc_handler = proc_dointvec,
1da177e4
LT		 4249 },
4250 {
e21e8467
SH		 4251 .procname = "dad_transmits",
4252 .data = &ipv6_devconf.dad_transmits,
4253 .maxlen = sizeof(int),
4254 .mode = 0644,
4255 .proc_handler = proc_dointvec,
1da177e4
LT		 4256 },
4257 {
e21e8467
SH		 4258 .procname = "router_solicitations",
4259 .data = &ipv6_devconf.rtr_solicits,
4260 .maxlen = sizeof(int),
4261 .mode = 0644,
4262 .proc_handler = proc_dointvec,
1da177e4
LT		 4263 },
4264 {
e21e8467
SH		 4265 .procname = "router_solicitation_interval",
4266 .data = &ipv6_devconf.rtr_solicit_interval,
4267 .maxlen = sizeof(int),
4268 .mode = 0644,
4269 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4270 },
4271 {
e21e8467
SH		 4272 .procname = "router_solicitation_delay",
4273 .data = &ipv6_devconf.rtr_solicit_delay,
4274 .maxlen = sizeof(int),
4275 .mode = 0644,
4276 .proc_handler = proc_dointvec_jiffies,
1da177e4
LT		 4277 },
4278 {
e21e8467
SH		 4279 .procname = "force_mld_version",
4280 .data = &ipv6_devconf.force_mld_version,
4281 .maxlen = sizeof(int),
4282 .mode = 0644,
4283 .proc_handler = proc_dointvec,
1da177e4
LT		 4284 },
4285#ifdef CONFIG_IPV6_PRIVACY
4286 {
e21e8467
SH		 4287 .procname = "use_tempaddr",
4288 .data = &ipv6_devconf.use_tempaddr,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = proc_dointvec,
1da177e4
LT		 4292 },
4293 {
e21e8467
SH		 4294 .procname = "temp_valid_lft",
4295 .data = &ipv6_devconf.temp_valid_lft,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
1da177e4
LT		 4299 },
4300 {
e21e8467
SH		 4301 .procname = "temp_prefered_lft",
4302 .data = &ipv6_devconf.temp_prefered_lft,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
1da177e4
LT		 4306 },
4307 {
e21e8467
SH		 4308 .procname = "regen_max_retry",
4309 .data = &ipv6_devconf.regen_max_retry,
4310 .maxlen = sizeof(int),
4311 .mode = 0644,
4312 .proc_handler = proc_dointvec,
1da177e4
LT		 4313 },
4314 {
e21e8467
SH		 4315 .procname = "max_desync_factor",
4316 .data = &ipv6_devconf.max_desync_factor,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
4319 .proc_handler = proc_dointvec,
1da177e4
LT		 4320 },
4321#endif
4322 {
e21e8467
SH		 4323 .procname = "max_addresses",
4324 .data = &ipv6_devconf.max_addresses,
4325 .maxlen = sizeof(int),
4326 .mode = 0644,
4327 .proc_handler = proc_dointvec,
1da177e4 4328 },
65f5c7c1 4329 {
e21e8467
SH		 4330 .procname = "accept_ra_defrtr",
4331 .data = &ipv6_devconf.accept_ra_defrtr,
4332 .maxlen = sizeof(int),
4333 .mode = 0644,
4334 .proc_handler = proc_dointvec,
65f5c7c1 4335 },
c4fd30eb 4336 {
e21e8467
SH		 4337 .procname = "accept_ra_pinfo",
4338 .data = &ipv6_devconf.accept_ra_pinfo,
4339 .maxlen = sizeof(int),
4340 .mode = 0644,
4341 .proc_handler = proc_dointvec,
c4fd30eb 4342 },
930d6ff2
YH		 4343#ifdef CONFIG_IPV6_ROUTER_PREF
4344 {
e21e8467
SH		 4345 .procname = "accept_ra_rtr_pref",
4346 .data = &ipv6_devconf.accept_ra_rtr_pref,
4347 .maxlen = sizeof(int),
4348 .mode = 0644,
4349 .proc_handler = proc_dointvec,
930d6ff2 4350 },
52e16356 4351 {
e21e8467
SH		 4352 .procname = "router_probe_interval",
4353 .data = &ipv6_devconf.rtr_probe_interval,
4354 .maxlen = sizeof(int),
4355 .mode = 0644,
4356 .proc_handler = proc_dointvec_jiffies,
52e16356 4357 },
fa03ef38 4358#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 4359 {
e21e8467
SH		 4360 .procname = "accept_ra_rt_info_max_plen",
4361 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4362 .maxlen = sizeof(int),
4363 .mode = 0644,
4364 .proc_handler = proc_dointvec,
09c884d4
YH		 4365 },
4366#endif
930d6ff2 4367#endif
fbea49e1 4368 {
e21e8467
SH		 4369 .procname = "proxy_ndp",
4370 .data = &ipv6_devconf.proxy_ndp,
4371 .maxlen = sizeof(int),
4372 .mode = 0644,
4373 .proc_handler = proc_dointvec,
fbea49e1 4374 },
0bcbc926 4375 {
e21e8467
SH		 4376 .procname = "accept_source_route",
4377 .data = &ipv6_devconf.accept_source_route,
4378 .maxlen = sizeof(int),
4379 .mode = 0644,
4380 .proc_handler = proc_dointvec,
0bcbc926 4381 },
95c385b4
NH		 4382#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4383 {
e21e8467
SH		 4384 .procname = "optimistic_dad",
4385 .data = &ipv6_devconf.optimistic_dad,
4386 .maxlen = sizeof(int),
4387 .mode = 0644,
4388 .proc_handler = proc_dointvec,
95c385b4
NH		 4389
4390 },
7bc570c8
YH		 4391#endif
4392#ifdef CONFIG_IPV6_MROUTE
4393 {
e21e8467
SH		 4394 .procname = "mc_forwarding",
4395 .data = &ipv6_devconf.mc_forwarding,
4396 .maxlen = sizeof(int),
4397 .mode = 0444,
4398 .proc_handler = proc_dointvec,
7bc570c8 4399 },
95c385b4 4400#endif
778d80be 4401 {
e21e8467
SH		 4402 .procname = "disable_ipv6",
4403 .data = &ipv6_devconf.disable_ipv6,
4404 .maxlen = sizeof(int),
4405 .mode = 0644,
4406 .proc_handler = addrconf_sysctl_disable,
778d80be 4407 },
1b34be74 4408 {
e21e8467
SH		 4409 .procname = "accept_dad",
4410 .data = &ipv6_devconf.accept_dad,
4411 .maxlen = sizeof(int),
4412 .mode = 0644,
4413 .proc_handler = proc_dointvec,
1b34be74 4414 },
f7734fdf 4415 {
f7734fdf
OP		 4416 .procname = "force_tllao",
4417 .data = &ipv6_devconf.force_tllao,
4418 .maxlen = sizeof(int),
4419 .mode = 0644,
4420 .proc_handler = proc_dointvec
4421 },
1da177e4 4422 {
f8572d8f 4423 /* sentinel */
1da177e4
LT		 4424 }
4425 },
1da177e4
LT		 4426};
4427
bff16c2f 4428static int __addrconf_sysctl_register(struct net *net, char *dev_name,
f8572d8f 4429 struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4430{
4431 int i;
1da177e4 4432 struct addrconf_sysctl_table *t;
1da177e4 4433
1dab6222
PE		 4434#define ADDRCONF_CTL_PATH_DEV 3
4435
4436 struct ctl_path addrconf_ctl_path[] = {
f8572d8f
EB		 4437 { .procname = "net", },
4438 { .procname = "ipv6", },
4439 { .procname = "conf", },
1dab6222
PE		 4440 { /* to be set */ },
4441 { },
4442 };
4443
4444
af879cc7 4445 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4446 if (t == NULL)
f68635e6
PE		 4447 goto out;
4448
bcdd553f 4449 for (i = 0; t->addrconf_vars[i].data; i++) {
e21e8467 4450 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
1da177e4 4451 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4452 t->addrconf_vars[i].extra2 = net;
1da177e4 4453 }
1da177e4 4454
1ab1457c
YH		 4455 /*
4456 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4457 * by sysctl and we wouldn't want anyone to change it under our feet
4458 * (see SIOCSIFNAME).
1ab1457c 4459 */
1dab6222
PE		 4460 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4461 if (!t->dev_name)
f68635e6 4462 goto free;
1da177e4 4463
1dab6222 4464 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
1da177e4 4465
bff16c2f 4466 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4467 t->addrconf_vars);
1da177e4
LT		 4468 if (t->sysctl_header == NULL)
4469 goto free_procname;
f68635e6
PE		 4470
4471 p->sysctl = t;
95897312 4472 return 0;
1da177e4 4473
f68635e6 4474free_procname:
1dab6222 4475 kfree(t->dev_name);
f68635e6 4476free:
1da177e4 4477 kfree(t);
f68635e6 4478out:
95897312 4479 return -ENOBUFS;
1da177e4
LT		 4480}
4481
408c4768
PE		 4482static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4483{
4484 struct addrconf_sysctl_table *t;
4485
4486 if (p->sysctl == NULL)
4487 return;
4488
4489 t = p->sysctl;
4490 p->sysctl = NULL;
4491 unregister_sysctl_table(t->sysctl_header);
4492 kfree(t->dev_name);
4493 kfree(t);
4494}
4495
f52295a9
PE		 4496static void addrconf_sysctl_register(struct inet6_dev *idev)
4497{
54716e3b 4498 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
f8572d8f 4499 &ndisc_ifinfo_sysctl_change);
c346dca1 4500 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
f8572d8f 4501 idev, &idev->cnf);
f52295a9
PE		 4502}
4503
408c4768 4504static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4505{
408c4768
PE		 4506 __addrconf_sysctl_unregister(&idev->cnf);
4507 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4508}
4509
4510
4511#endif
4512
2c8c1e72 4513static int __net_init addrconf_init_net(struct net *net)
e0da5a48
PE		 4514{
4515 int err;
4516 struct ipv6_devconf *all, *dflt;
4517
4518 err = -ENOMEM;
4519 all = &ipv6_devconf;
4520 dflt = &ipv6_devconf_dflt;
4521
09ad9bc7 4522 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4523 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4524 if (all == NULL)
4525 goto err_alloc_all;
4526
4527 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4528 if (dflt == NULL)
4529 goto err_alloc_dflt;
56d417b1
BH		 4530 } else {
4531 /* these will be inherited by all namespaces */
4532 dflt->autoconf = ipv6_defaults.autoconf;
4533 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
e0da5a48
PE		 4534 }
4535
4536 net->ipv6.devconf_all = all;
4537 net->ipv6.devconf_dflt = dflt;
4538
4539#ifdef CONFIG_SYSCTL
f8572d8f 4540 err = __addrconf_sysctl_register(net, "all", NULL, all);
e0da5a48
PE		 4541 if (err < 0)
4542 goto err_reg_all;
4543
f8572d8f 4544 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
e0da5a48
PE		 4545 if (err < 0)
4546 goto err_reg_dflt;
4547#endif
4548 return 0;
4549
4550#ifdef CONFIG_SYSCTL
4551err_reg_dflt:
4552 __addrconf_sysctl_unregister(all);
4553err_reg_all:
4554 kfree(dflt);
4555#endif
4556err_alloc_dflt:
4557 kfree(all);
4558err_alloc_all:
4559 return err;
4560}
4561
2c8c1e72 4562static void __net_exit addrconf_exit_net(struct net *net)
e0da5a48
PE		 4563{
4564#ifdef CONFIG_SYSCTL
4565 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4566 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4567#endif
09ad9bc7 4568 if (!net_eq(net, &init_net)) {
e0da5a48
PE		 4569 kfree(net->ipv6.devconf_dflt);
4570 kfree(net->ipv6.devconf_all);
4571 }
4572}
4573
4574static struct pernet_operations addrconf_ops = {
4575 .init = addrconf_init_net,
4576 .exit = addrconf_exit_net,
4577};
4578
1da177e4
LT		 4579/*
4580 * Device notifier
4581 */
4582
4583int register_inet6addr_notifier(struct notifier_block *nb)
4584{
1ab1457c 4585 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4 4586}
7159039a
YH		 4587EXPORT_SYMBOL(register_inet6addr_notifier);
4588
1da177e4
LT		 4589int unregister_inet6addr_notifier(struct notifier_block *nb)
4590{
e21e8467 4591 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
1da177e4 4592}
7159039a
YH		 4593EXPORT_SYMBOL(unregister_inet6addr_notifier);
4594
1da177e4
LT		 4595/*
4596 * Init / cleanup code
4597 */
4598
4599int __init addrconf_init(void)
4600{
c2e21293 4601 int i, err;
2a8cc6c8 4602
e21e8467
SH		 4603 err = ipv6_addr_label_init();
4604 if (err < 0) {
4605 printk(KERN_CRIT "IPv6 Addrconf:"
4606 " cannot initialize default policy table: %d.\n", err);
2a8cc6c8
YH		 4607 return err;
4608 }
1da177e4 4609
e0da5a48
PE		 4610 register_pernet_subsys(&addrconf_ops);
4611
1da177e4
LT		 4612 /* The addrconf netdev notifier requires that loopback_dev
4613 * has it's ipv6 private information allocated and setup
4614 * before it can bring up and give link-local addresses
4615 * to other devices which are up.
4616 *
4617 * Unfortunately, loopback_dev is not necessarily the first
4618 * entry in the global dev_base list of net devices. In fact,
4619 * it is likely to be the very last entry on that list.
4620 * So this causes the notifier registry below to try and
4621 * give link-local addresses to all devices besides loopback_dev
4622 * first, then loopback_dev, which cases all the non-loopback_dev
4623 * devices to fail to get a link-local address.
4624 *
4625 * So, as a temporary fix, allocate the ipv6 structure for
4626 * loopback_dev first by hand.
4627 * Longer term, all of the dependencies ipv6 has upon the loopback
4628 * device and it being up should be removed.
4629 */
4630 rtnl_lock();
2774c7ab 4631 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4632 err = -ENOMEM;
4633 rtnl_unlock();
4634 if (err)
e0da5a48 4635 goto errlo;
1da177e4 4636
c2e21293 4637 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4638 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4639
1da177e4
LT		 4640 register_netdevice_notifier(&ipv6_dev_notf);
4641
1da177e4 4642 addrconf_verify(0);
c127ea2c
TG		 4643
4644 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4645 if (err < 0)
4646 goto errout;
4647
4648 /* Only the first call to __rtnl_register can fail */
4649 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4650 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4651 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4652 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4653 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4654
2a8cc6c8
YH		 4655 ipv6_addr_label_rtnl_register();
4656
1da177e4 4657 return 0;
c127ea2c
TG		 4658errout:
4659 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4660errlo:
4661 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4662
4663 return err;
1da177e4
LT		 4664}
4665
09f7709f 4666void addrconf_cleanup(void)
1da177e4 4667{
176c39af 4668 struct net_device *dev;
1da177e4
LT		 4669 int i;
4670
4671 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48 4672 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4673
4674 rtnl_lock();
4675
176c39af
DL		 4676 /* clean dev list */
4677 for_each_netdev(&init_net, dev) {
4678 if (__in6_dev_get(dev) == NULL)
4679 continue;
4680 addrconf_ifdown(dev, 1);
4681 }
4682 addrconf_ifdown(init_net.loopback_dev, 2);
4683
1da177e4
LT		 4684 /*
4685 * Check hash table.
4686 */
5c578aed 4687 spin_lock_bh(&addrconf_hash_lock);
c2e21293 4688 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4689 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5c578aed 4690 spin_unlock_bh(&addrconf_hash_lock);
1da177e4
LT		 4691
4692 del_timer(&addr_chk_timer);
1da177e4 4693 rtnl_unlock();
1da177e4 4694}
Clone of davem's net-next-2.6 tree