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IPv6: only update the lifetime of the relevant temporary address
[deliverable/linux.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16
17/*
18 * Changes:
19 *
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
23 * unload.
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
26 * packets.
27 * yoshfuji@USAGI : Fixed interval between DAD
28 * packets.
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
32 * support.
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
37 * seq_file.
b1cacb68
YH		 38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
40 * status etc.
1da177e4
LT		 41 */
42
1da177e4
LT		 43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/socket.h>
46#include <linux/sockios.h>
1da177e4
LT		 47#include <linux/net.h>
48#include <linux/in6.h>
49#include <linux/netdevice.h>
1823730f 50#include <linux/if_addr.h>
1da177e4
LT		 51#include <linux/if_arp.h>
52#include <linux/if_arcnet.h>
53#include <linux/if_infiniband.h>
54#include <linux/route.h>
55#include <linux/inetdevice.h>
56#include <linux/init.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
4fc268d2 60#include <linux/capability.h>
1da177e4
LT		 61#include <linux/delay.h>
62#include <linux/notifier.h>
543537bd 63#include <linux/string.h>
1da177e4 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
f52295a9 104static void addrconf_sysctl_register(struct inet6_dev *idev);
408c4768
PE		 105static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106#else
107static inline void addrconf_sysctl_register(struct inet6_dev *idev)
108{
109}
110
111static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
112{
113}
1da177e4
LT		 114#endif
115
116#ifdef CONFIG_IPV6_PRIVACY
117static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 118static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 119static void ipv6_regen_rndid(unsigned long data);
120
121static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 122#endif
123
124static int ipv6_count_addresses(struct inet6_dev *idev);
125
126/*
127 * Configured unicast address hash table
128 */
129static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130static DEFINE_RWLOCK(addrconf_hash_lock);
131
1da177e4
LT		 132static void addrconf_verify(unsigned long);
133
8d06afab 134static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 135static DEFINE_SPINLOCK(addrconf_verify_lock);
136
137static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139
140static int addrconf_ifdown(struct net_device *dev, int how);
141
e431b8c0 142static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 143static void addrconf_dad_timer(unsigned long data);
144static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 145static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 146static void addrconf_rs_timer(unsigned long data);
147static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
149
1ab1457c 150static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4 151 struct prefix_info *pinfo);
06bfe655
DL		 152static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
1da177e4 154
e041c683 155static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 156
ab32ea5d 157struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 158 .forwarding = 0,
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
161 .accept_ra = 1,
162 .accept_redirects = 1,
163 .autoconf = 1,
164 .force_mld_version = 0,
165 .dad_transmits = 1,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169#ifdef CONFIG_IPV6_PRIVACY
170 .use_tempaddr = 0,
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
175#endif
176 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 177 .accept_ra_defrtr = 1,
c4fd30eb 178 .accept_ra_pinfo = 1,
930d6ff2
YH		 179#ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
52e16356 181 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 182#ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
184#endif
930d6ff2 185#endif
fbea49e1 186 .proxy_ndp = 0,
0bcbc926 187 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 188};
189
ab32ea5d 190static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201#ifdef CONFIG_IPV6_PRIVACY
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207#endif
208 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 209 .accept_ra_defrtr = 1,
c4fd30eb 210 .accept_ra_pinfo = 1,
930d6ff2
YH		 211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
52e16356 213 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
216#endif
930d6ff2 217#endif
fbea49e1 218 .proxy_ndp = 0,
0bcbc926 219 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 220};
221
222/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 223const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 224const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
225
f24e3d65
MC		 226/* Check if a valid qdisc is available */
227static inline int addrconf_qdisc_ok(struct net_device *dev)
228{
229 return (dev->qdisc != &noop_qdisc);
230}
231
1da177e4
LT		 232static void addrconf_del_timer(struct inet6_ifaddr *ifp)
233{
234 if (del_timer(&ifp->timer))
235 __in6_ifa_put(ifp);
236}
237
238enum addrconf_timer_t
239{
240 AC_NONE,
241 AC_DAD,
242 AC_RS,
243};
244
245static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
247 unsigned long when)
248{
249 if (!del_timer(&ifp->timer))
250 in6_ifa_hold(ifp);
251
252 switch (what) {
253 case AC_DAD:
254 ifp->timer.function = addrconf_dad_timer;
255 break;
256 case AC_RS:
257 ifp->timer.function = addrconf_rs_timer;
258 break;
259 default:;
260 }
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
263}
264
7f7d9a6b
HX		 265static int snmp6_alloc_dev(struct inet6_dev *idev)
266{
7f7d9a6b 267 if (snmp_mib_init((void **)idev->stats.ipv6,
c69bce20 268 sizeof(struct ipstats_mib)) < 0)
7f7d9a6b
HX		 269 goto err_ip;
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
c69bce20 271 sizeof(struct icmpv6_mib)) < 0)
7f7d9a6b 272 goto err_icmp;
14878f75 273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
c69bce20 274 sizeof(struct icmpv6msg_mib)) < 0)
14878f75 275 goto err_icmpmsg;
7f7d9a6b
HX		 276
277 return 0;
278
14878f75
DS		 279err_icmpmsg:
280 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 281err_icmp:
282 snmp_mib_free((void **)idev->stats.ipv6);
283err_ip:
aaf70ec7 284 return -ENOMEM;
7f7d9a6b
HX		 285}
286
16910b98 287static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 288{
14878f75 289 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 292}
293
1da177e4
LT		 294/* Nobody refers to this device, we may destroy it. */
295
8814c4b5
YH		 296static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
297{
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
299 kfree(idev);
300}
301
1da177e4
LT		 302void in6_dev_finish_destroy(struct inet6_dev *idev)
303{
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307#ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
309#endif
310 dev_put(dev);
311 if (!idev->dead) {
312 printk("Freeing alive inet6 device %p\n", idev);
313 return;
314 }
315 snmp6_free_dev(idev);
8814c4b5 316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 317}
318
7159039a
YH		 319EXPORT_SYMBOL(in6_dev_finish_destroy);
320
1da177e4
LT		 321static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
322{
323 struct inet6_dev *ndev;
d88ae4cc 324 struct in6_addr maddr;
1da177e4
LT		 325
326 ASSERT_RTNL();
327
328 if (dev->mtu < IPV6_MIN_MTU)
329 return NULL;
330
1ab1457c 331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 332
1ab1457c
YH		 333 if (ndev == NULL)
334 return NULL;
322f74a4
IO		 335
336 rwlock_init(&ndev->lock);
337 ndev->dev = dev;
441fc2a2 338 memcpy(&ndev->cnf, dev->nd_net->ipv6.devconf_dflt, sizeof(ndev->cnf));
322f74a4
IO		 339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
343 kfree(ndev);
344 return NULL;
345 }
346 /* We refer to the device */
347 dev_hold(dev);
1da177e4 348
322f74a4
IO		 349 if (snmp6_alloc_dev(ndev) < 0) {
350 ADBG((KERN_WARNING
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __FUNCTION__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
354 ndev->dead = 1;
355 in6_dev_finish_destroy(ndev);
356 return NULL;
357 }
1da177e4 358
322f74a4
IO		 359 if (snmp6_register_dev(ndev) < 0) {
360 ADBG((KERN_WARNING
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __FUNCTION__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
364 ndev->dead = 1;
365 in6_dev_finish_destroy(ndev);
366 return NULL;
367 }
368
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
371 */
372 in6_dev_hold(ndev);
1da177e4
LT		 373
374#ifdef CONFIG_IPV6_PRIVACY
b24b8a24 375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
322f74a4
IO		 376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 378#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
380#endif
381 dev->type == ARPHRD_NONE) {
322f74a4
IO		 382 printk(KERN_INFO
383 "%s: Disabled Privacy Extensions\n",
384 dev->name);
385 ndev->cnf.use_tempaddr = -1;
c7dc89c0
FT		 386
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
388 printk(KERN_INFO
389 "%s: Disabled Multicast RS\n",
390 dev->name);
391 ndev->cnf.rtr_solicits = 0;
392 }
322f74a4
IO		 393 } else {
394 in6_dev_hold(ndev);
395 ipv6_regen_rndid((unsigned long) ndev);
396 }
1da177e4
LT		 397#endif
398
f24e3d65 399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 400 ndev->if_flags |= IF_READY;
401
322f74a4
IO		 402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
f52295a9 404 addrconf_sysctl_register(ndev);
30c4cf57
DS		 405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
1da177e4
LT		 412 return ndev;
413}
414
415static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
1ab1457c 443
1da177e4
LT		 444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
1da177e4
LT		 452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457}
458
459
e186932b 460static void addrconf_forward_change(struct net *net, __s32 newf)
1da177e4
LT		 461{
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
bff16c2f 466 for_each_netdev(net, dev) {
8814c4b5 467 rcu_read_lock();
1da177e4
LT		 468 idev = __in6_dev_get(dev);
469 if (idev) {
e186932b
PE		 470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
1da177e4
LT		 472 if (changed)
473 dev_forward_change(idev);
474 }
8814c4b5 475 rcu_read_unlock();
1da177e4
LT		 476 }
477 read_unlock(&dev_base_lock);
478}
c8fecf22
PE		 479
480static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
481{
bff16c2f
PE		 482 struct net *net;
483
484 net = (struct net *)table->extra2;
441fc2a2 485 if (p == &net->ipv6.devconf_dflt->forwarding)
c8fecf22
PE		 486 return;
487
e186932b
PE		 488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
c8fecf22
PE		 492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
494
495 if (*p)
496 rt6_purge_dflt_routers();
497}
1da177e4
LT		 498#endif
499
500/* Nobody refers to this ifaddr, destroy it */
501
502void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
503{
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506#ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
508#endif
509
510 in6_dev_put(ifp->idev);
511
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
514
515 if (!ifp->dead) {
516 printk("Freeing alive inet6 address %p\n", ifp);
517 return;
518 }
519 dst_release(&ifp->rt->u.dst);
520
521 kfree(ifp);
522}
523
e55ffac6
BH		 524static void
525ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
526{
527 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 529
530 /*
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
533 */
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
8a6ce0c0 536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 537 break;
538 }
539
540 ifp->if_next = *ifap;
541 *ifap = ifp;
542}
543
1da177e4
LT		 544/* On success it returns ifp with increased reference count */
545
546static struct inet6_ifaddr *
547ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 548 int scope, u32 flags)
1da177e4
LT		 549{
550 struct inet6_ifaddr *ifa = NULL;
551 struct rt6_info *rt;
552 int hash;
553 int err = 0;
554
8814c4b5 555 rcu_read_lock_bh();
1da177e4
LT		 556 if (idev->dead) {
557 err = -ENODEV; /*XXX*/
558 goto out2;
559 }
560
561 write_lock(&addrconf_hash_lock);
562
563 /* Ignore adding duplicate addresses on an interface */
06bfe655 564 if (ipv6_chk_same_addr(&init_net, addr, idev->dev)) {
1da177e4
LT		 565 ADBG(("ipv6_add_addr: already assigned\n"));
566 err = -EEXIST;
567 goto out;
568 }
569
322f74a4 570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 571
572 if (ifa == NULL) {
573 ADBG(("ipv6_add_addr: malloc failed\n"));
574 err = -ENOBUFS;
575 goto out;
576 }
577
578 rt = addrconf_dst_alloc(idev, addr, 0);
579 if (IS_ERR(rt)) {
580 err = PTR_ERR(rt);
581 goto out;
582 }
583
1da177e4
LT		 584 ipv6_addr_copy(&ifa->addr, addr);
585
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
589 ifa->scope = scope;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
593
57f5f544
KF		 594 ifa->rt = rt;
595
95c385b4
NH		 596 /*
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
601 */
602
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
605
1da177e4
LT		 606 ifa->idev = idev;
607 in6_dev_hold(idev);
608 /* For caller */
609 in6_ifa_hold(ifa);
610
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
613
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
616 in6_ifa_hold(ifa);
617 write_unlock(&addrconf_hash_lock);
618
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
e55ffac6 621 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 622
623#ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
627 in6_ifa_hold(ifa);
628 }
629#endif
630
1da177e4
LT		 631 in6_ifa_hold(ifa);
632 write_unlock(&idev->lock);
633out2:
8814c4b5 634 rcu_read_unlock_bh();
1da177e4 635
fd92833a 636 if (likely(err == 0))
e041c683 637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 638 else {
639 kfree(ifa);
640 ifa = ERR_PTR(err);
641 }
642
643 return ifa;
644out:
645 write_unlock(&addrconf_hash_lock);
646 goto out2;
647}
648
649/* This function wants to get referenced ifp and releases it before return */
650
651static void ipv6_del_addr(struct inet6_ifaddr *ifp)
652{
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
655 int hash;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
658
659 hash = ipv6_addr_hash(&ifp->addr);
660
661 ifp->dead = 1;
662
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
666 if (ifa == ifp) {
667 *ifap = ifa->lst_next;
668 __in6_ifa_put(ifp);
669 ifa->lst_next = NULL;
670 break;
671 }
672 }
673 write_unlock_bh(&addrconf_hash_lock);
674
675 write_lock_bh(&idev->lock);
676#ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
680 if (ifa == ifp) {
681 *ifap = ifa->tmp_next;
682 if (ifp->ifpub) {
683 in6_ifa_put(ifp->ifpub);
684 ifp->ifpub = NULL;
685 }
686 __in6_ifa_put(ifp);
687 ifa->tmp_next = NULL;
688 break;
689 }
690 }
691 }
692#endif
693
1d142804 694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 695 if (ifa == ifp) {
696 *ifap = ifa->if_next;
697 __in6_ifa_put(ifp);
698 ifa->if_next = NULL;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
700 break;
701 deleted = 1;
1d142804 702 continue;
1da177e4
LT		 703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
705 ifp->prefix_len)) {
706 if (ifa->flags & IFA_F_PERMANENT) {
707 onlink = 1;
708 if (deleted)
709 break;
710 } else {
711 unsigned long lifetime;
712
713 if (!onlink)
714 onlink = -1;
715
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
723 }
724 }
725 }
1d142804 726 ifap = &ifa->if_next;
1da177e4
LT		 727 }
728 write_unlock_bh(&idev->lock);
729
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
731
e041c683 732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 733
734 addrconf_del_timer(ifp);
735
736 /*
737 * Purge or update corresponding prefix
738 *
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
748 *
749 * --yoshfuji
750 */
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
753 struct rt6_info *rt;
754
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
757
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
759 if (onlink == 0) {
e0a1ad73 760 ip6_del_rt(rt);
1da177e4
LT		 761 rt = NULL;
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
765 }
766 }
767 dst_release(&rt->u.dst);
768 }
769
770 in6_ifa_put(ifp);
771}
772
773#ifdef CONFIG_IPV6_PRIVACY
774static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
775{
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
779 int tmp_plen;
780 int ret = 0;
781 int max_addresses;
95c385b4 782 u32 addr_flags;
1da177e4
LT		 783
784 write_lock(&idev->lock);
785 if (ift) {
786 spin_lock_bh(&ift->lock);
787 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788 spin_unlock_bh(&ift->lock);
789 tmpaddr = &addr;
790 } else {
791 tmpaddr = NULL;
792 }
793retry:
794 in6_dev_hold(idev);
795 if (idev->cnf.use_tempaddr <= 0) {
796 write_unlock(&idev->lock);
797 printk(KERN_INFO
798 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
799 in6_dev_put(idev);
800 ret = -1;
801 goto out;
802 }
803 spin_lock_bh(&ifp->lock);
804 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805 idev->cnf.use_tempaddr = -1; /*XXX*/
806 spin_unlock_bh(&ifp->lock);
807 write_unlock(&idev->lock);
808 printk(KERN_WARNING
809 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
810 in6_dev_put(idev);
811 ret = -1;
812 goto out;
813 }
814 in6_ifa_hold(ifp);
815 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817 spin_unlock_bh(&ifp->lock);
818 write_unlock(&idev->lock);
819 printk(KERN_WARNING
820 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
821 in6_ifa_put(ifp);
822 in6_dev_put(idev);
823 ret = -1;
824 goto out;
825 }
826 memcpy(&addr.s6_addr[8], idev->rndid, 8);
827 tmp_valid_lft = min_t(__u32,
828 ifp->valid_lft,
829 idev->cnf.temp_valid_lft);
1ab1457c
YH		 830 tmp_prefered_lft = min_t(__u32,
831 ifp->prefered_lft,
1da177e4
LT		 832 idev->cnf.temp_prefered_lft - desync_factor / HZ);
833 tmp_plen = ifp->prefix_len;
834 max_addresses = idev->cnf.max_addresses;
835 tmp_cstamp = ifp->cstamp;
836 tmp_tstamp = ifp->tstamp;
837 spin_unlock_bh(&ifp->lock);
838
839 write_unlock(&idev->lock);
95c385b4
NH		 840
841 addr_flags = IFA_F_TEMPORARY;
842 /* set in addrconf_prefix_rcv() */
843 if (ifp->flags & IFA_F_OPTIMISTIC)
844 addr_flags |= IFA_F_OPTIMISTIC;
845
1da177e4 846 ift = !max_addresses ||
1ab1457c 847 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 848 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 849 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
850 addr_flags) : NULL;
1da177e4
LT		 851 if (!ift || IS_ERR(ift)) {
852 in6_ifa_put(ifp);
853 in6_dev_put(idev);
854 printk(KERN_INFO
855 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
856 tmpaddr = &addr;
857 write_lock(&idev->lock);
858 goto retry;
859 }
860
861 spin_lock_bh(&ift->lock);
862 ift->ifpub = ifp;
863 ift->valid_lft = tmp_valid_lft;
864 ift->prefered_lft = tmp_prefered_lft;
865 ift->cstamp = tmp_cstamp;
866 ift->tstamp = tmp_tstamp;
867 spin_unlock_bh(&ift->lock);
868
869 addrconf_dad_start(ift, 0);
870 in6_ifa_put(ift);
871 in6_dev_put(idev);
872out:
873 return ret;
874}
875#endif
876
877/*
072047e4 878 * Choose an appropriate source address (RFC3484)
1da177e4 879 */
072047e4
YH		 880struct ipv6_saddr_score {
881 int addr_type;
882 unsigned int attrs;
883 int matchlen;
0d27b427 884 int scope;
072047e4
YH		 885 unsigned int rule;
886};
887
888#define IPV6_SADDR_SCORE_LOCAL 0x0001
889#define IPV6_SADDR_SCORE_PREFERRED 0x0004
890#define IPV6_SADDR_SCORE_HOA 0x0008
891#define IPV6_SADDR_SCORE_OIF 0x0010
892#define IPV6_SADDR_SCORE_LABEL 0x0020
893#define IPV6_SADDR_SCORE_PRIVACY 0x0040
894
b6f99a21 895static inline int ipv6_saddr_preferred(int type)
1da177e4 896{
072047e4
YH		 897 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
899 return 1;
900 return 0;
1da177e4
LT		 901}
902
072047e4 903int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 904 struct in6_addr *daddr, struct in6_addr *saddr)
905{
072047e4
YH		 906 struct ipv6_saddr_score hiscore;
907 struct inet6_ifaddr *ifa_result = NULL;
908 int daddr_type = __ipv6_addr_type(daddr);
909 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
303065a8
YH		 910 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
911 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
072047e4 912 struct net_device *dev;
1da177e4 913
072047e4 914 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 915
072047e4 916 read_lock(&dev_base_lock);
8814c4b5 917 rcu_read_lock();
1da177e4 918
881d966b 919 for_each_netdev(&init_net, dev) {
072047e4
YH		 920 struct inet6_dev *idev;
921 struct inet6_ifaddr *ifa;
922
923 /* Rule 0: Candidate Source Address (section 4)
924 * - multicast and link-local destination address,
925 * the set of candidate source address MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same link as the outgoing
928 * interface.
929 * (- For site-local destination addresses, the
930 * set of candidate source addresses MUST only
931 * include addresses assigned to interfaces
932 * belonging to the same site as the outgoing
933 * interface.)
934 */
935 if ((daddr_type & IPV6_ADDR_MULTICAST ||
936 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
937 daddr_dev && dev != daddr_dev)
938 continue;
1da177e4 939
1da177e4 940 idev = __in6_dev_get(dev);
072047e4
YH		 941 if (!idev)
942 continue;
943
944 read_lock_bh(&idev->lock);
945 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
946 struct ipv6_saddr_score score;
947
948 score.addr_type = __ipv6_addr_type(&ifa->addr);
949
6b3ae80a
YH		 950 /* Rule 0:
951 * - Tentative Address (RFC2462 section 5.4)
952 * - A tentative address is not considered
953 * "assigned to an interface" in the traditional
95c385b4 954 * sense, unless it is also flagged as optimistic.
6b3ae80a 955 * - Candidate Source Address (section 4)
072047e4
YH		 956 * - In any case, anycast addresses, multicast
957 * addresses, and the unspecified address MUST
958 * NOT be included in a candidate set.
959 */
95c385b4
NH		 960 if ((ifa->flags & IFA_F_TENTATIVE) &&
961 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 962 continue;
072047e4
YH		 963 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
964 score.addr_type & IPV6_ADDR_MULTICAST)) {
965 LIMIT_NETDEBUG(KERN_DEBUG
3b6d821c 966 "ADDRCONF: unspecified / multicast address "
072047e4
YH		 967 "assigned as unicast address on %s",
968 dev->name);
969 continue;
970 }
971
972 score.attrs = 0;
973 score.matchlen = 0;
974 score.scope = 0;
975 score.rule = 0;
976
977 if (ifa_result == NULL) {
978 /* record it if the first available entry */
979 goto record_it;
980 }
981
982 /* Rule 1: Prefer same address */
983 if (hiscore.rule < 1) {
984 if (ipv6_addr_equal(&ifa_result->addr, daddr))
985 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
986 hiscore.rule++;
987 }
988 if (ipv6_addr_equal(&ifa->addr, daddr)) {
989 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
991 score.rule = 1;
992 goto record_it;
1da177e4 993 }
072047e4
YH		 994 } else {
995 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
996 continue;
1da177e4 997 }
1da177e4 998
072047e4
YH		 999 /* Rule 2: Prefer appropriate scope */
1000 if (hiscore.rule < 2) {
1001 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1002 hiscore.rule++;
1003 }
1004 score.scope = __ipv6_addr_src_scope(score.addr_type);
1005 if (hiscore.scope < score.scope) {
1006 if (hiscore.scope < daddr_scope) {
1007 score.rule = 2;
1008 goto record_it;
1009 } else
1010 continue;
1011 } else if (score.scope < hiscore.scope) {
1012 if (score.scope < daddr_scope)
e55ffac6 1013 break; /* addresses sorted by scope */
072047e4
YH		 1014 else {
1015 score.rule = 2;
1016 goto record_it;
1017 }
1018 }
1da177e4 1019
95c385b4 1020 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1021 if (hiscore.rule < 3) {
1022 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1023 (((ifa_result->flags &
1024 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1025 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1026 hiscore.rule++;
1027 }
1028 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1029 (((ifa->flags &
95c385b4 1030 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1033 score.rule = 3;
1034 goto record_it;
1035 }
1036 } else {
1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1038 continue;
1039 }
1da177e4 1040
3b9f9a1c 1041 /* Rule 4: Prefer home address */
59fbb3a6 1042#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1043 if (hiscore.rule < 4) {
1044 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1046 hiscore.rule++;
1047 }
1048 if (ifa->flags & IFA_F_HOMEADDRESS) {
1049 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1051 score.rule = 4;
1052 goto record_it;
1053 }
1054 } else {
1055 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1056 continue;
1057 }
1058#else
220bbd74
YH		 1059 if (hiscore.rule < 4)
1060 hiscore.rule++;
3b9f9a1c 1061#endif
072047e4
YH		 1062
1063 /* Rule 5: Prefer outgoing interface */
1064 if (hiscore.rule < 5) {
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa_result->idev->dev)
1067 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1068 hiscore.rule++;
1069 }
1070 if (daddr_dev == NULL ||
1071 daddr_dev == ifa->idev->dev) {
1072 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1074 score.rule = 5;
1075 goto record_it;
1076 }
1077 } else {
1078 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1079 continue;
1080 }
1081
1082 /* Rule 6: Prefer matching label */
1083 if (hiscore.rule < 6) {
c1ee656c 1084 if (ipv6_addr_label(&ifa_result->addr,
303065a8
YH		 1085 hiscore.addr_type,
1086 ifa_result->idev->dev->ifindex) == daddr_label)
072047e4
YH		 1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1088 hiscore.rule++;
1089 }
c1ee656c 1090 if (ipv6_addr_label(&ifa->addr,
303065a8
YH		 1091 score.addr_type,
1092 ifa->idev->dev->ifindex) == daddr_label) {
072047e4
YH		 1093 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1095 score.rule = 6;
1096 goto record_it;
1da177e4 1097 }
072047e4
YH		 1098 } else {
1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1100 continue;
1101 }
1102
44fd0261 1103#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1104 /* Rule 7: Prefer public address
1105 * Note: prefer temprary address if use_tempaddr >= 2
1106 */
1107 if (hiscore.rule < 7) {
1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1111 hiscore.rule++;
1112 }
1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1117 score.rule = 7;
1118 goto record_it;
1119 }
1120 } else {
1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1122 continue;
1123 }
5e2707fa
YH		 1124#else
1125 if (hiscore.rule < 7)
1126 hiscore.rule++;
44fd0261 1127#endif
072047e4 1128 /* Rule 8: Use longest matching prefix */
12da2a43 1129 if (hiscore.rule < 8) {
072047e4 1130 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1131 hiscore.rule++;
1132 }
072047e4
YH		 1133 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134 if (score.matchlen > hiscore.matchlen) {
1135 score.rule = 8;
1136 goto record_it;
1da177e4 1137 }
072047e4
YH		 1138#if 0
1139 else if (score.matchlen < hiscore.matchlen)
1140 continue;
1141#endif
1142
1143 /* Final Rule: choose first available one */
1144 continue;
1145record_it:
1146 if (ifa_result)
1147 in6_ifa_put(ifa_result);
1148 in6_ifa_hold(ifa);
1149 ifa_result = ifa;
1150 hiscore = score;
1da177e4 1151 }
072047e4 1152 read_unlock_bh(&idev->lock);
1da177e4 1153 }
8814c4b5 1154 rcu_read_unlock();
1da177e4
LT		 1155 read_unlock(&dev_base_lock);
1156
072047e4
YH		 1157 if (!ifa_result)
1158 return -EADDRNOTAVAIL;
1ab1457c 1159
072047e4
YH		 1160 ipv6_addr_copy(saddr, &ifa_result->addr);
1161 in6_ifa_put(ifa_result);
1162 return 0;
1da177e4
LT		 1163}
1164
1165
1166int ipv6_get_saddr(struct dst_entry *dst,
1167 struct in6_addr *daddr, struct in6_addr *saddr)
1168{
7a3025b1 1169 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1170}
1171
7159039a 1172EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1173
95c385b4
NH		 1174int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175 unsigned char banned_flags)
1da177e4
LT		 1176{
1177 struct inet6_dev *idev;
1178 int err = -EADDRNOTAVAIL;
1179
8814c4b5 1180 rcu_read_lock();
1da177e4
LT		 1181 if ((idev = __in6_dev_get(dev)) != NULL) {
1182 struct inet6_ifaddr *ifp;
1183
1184 read_lock_bh(&idev->lock);
1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1186 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1187 ipv6_addr_copy(addr, &ifp->addr);
1188 err = 0;
1189 break;
1190 }
1191 }
1192 read_unlock_bh(&idev->lock);
1193 }
8814c4b5 1194 rcu_read_unlock();
1da177e4
LT		 1195 return err;
1196}
1197
1198static int ipv6_count_addresses(struct inet6_dev *idev)
1199{
1200 int cnt = 0;
1201 struct inet6_ifaddr *ifp;
1202
1203 read_lock_bh(&idev->lock);
1204 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1205 cnt++;
1206 read_unlock_bh(&idev->lock);
1207 return cnt;
1208}
1209
bfeade08
DL		 1210int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211 struct net_device *dev, int strict)
1da177e4
LT		 1212{
1213 struct inet6_ifaddr * ifp;
1214 u8 hash = ipv6_addr_hash(addr);
1215
1216 read_lock_bh(&addrconf_hash_lock);
1217 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
bfeade08
DL		 1218 if (ifp->idev->dev->nd_net != net)
1219 continue;
1da177e4
LT		 1220 if (ipv6_addr_equal(&ifp->addr, addr) &&
1221 !(ifp->flags&IFA_F_TENTATIVE)) {
1222 if (dev == NULL || ifp->idev->dev == dev ||
1223 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1224 break;
1225 }
1226 }
1227 read_unlock_bh(&addrconf_hash_lock);
1228 return ifp != NULL;
1229}
7159039a
YH		 1230EXPORT_SYMBOL(ipv6_chk_addr);
1231
1da177e4 1232static
06bfe655
DL		 1233int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234 struct net_device *dev)
1da177e4
LT		 1235{
1236 struct inet6_ifaddr * ifp;
1237 u8 hash = ipv6_addr_hash(addr);
1238
1239 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
06bfe655
DL		 1240 if (ifp->idev->dev->nd_net != net)
1241 continue;
1da177e4
LT		 1242 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243 if (dev == NULL || ifp->idev->dev == dev)
1244 break;
1245 }
1246 }
1247 return ifp != NULL;
1248}
1249
1cab3da6
DL		 1250struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251 struct net_device *dev, int strict)
1da177e4
LT		 1252{
1253 struct inet6_ifaddr * ifp;
1254 u8 hash = ipv6_addr_hash(addr);
1255
1256 read_lock_bh(&addrconf_hash_lock);
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1cab3da6
DL		 1258 if (ifp->idev->dev->nd_net != net)
1259 continue;
1da177e4
LT		 1260 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 if (dev == NULL || ifp->idev->dev == dev ||
1262 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1263 in6_ifa_hold(ifp);
1264 break;
1265 }
1266 }
1267 }
1268 read_unlock_bh(&addrconf_hash_lock);
1269
1270 return ifp;
1271}
1272
1273int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1274{
1275 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1276 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1277 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1279 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1280 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1281 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1283
1284 if (!sk2_rcv_saddr && !sk_ipv6only)
1285 return 1;
1286
1287 if (addr_type2 == IPV6_ADDR_ANY &&
1288 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1289 return 1;
1290
1291 if (addr_type == IPV6_ADDR_ANY &&
1292 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1293 return 1;
1294
1295 if (sk2_rcv_saddr6 &&
1296 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1297 return 1;
1298
1299 if (addr_type == IPV6_ADDR_MAPPED &&
1300 !sk2_ipv6only &&
1301 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1302 return 1;
1303
1304 return 0;
1305}
1306
1307/* Gets referenced address, destroys ifaddr */
1308
9f5336e2 1309static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1310{
1da177e4
LT		 1311 if (ifp->flags&IFA_F_PERMANENT) {
1312 spin_lock_bh(&ifp->lock);
1313 addrconf_del_timer(ifp);
1314 ifp->flags |= IFA_F_TENTATIVE;
1315 spin_unlock_bh(&ifp->lock);
1316 in6_ifa_put(ifp);
1317#ifdef CONFIG_IPV6_PRIVACY
1318 } else if (ifp->flags&IFA_F_TEMPORARY) {
1319 struct inet6_ifaddr *ifpub;
1320 spin_lock_bh(&ifp->lock);
1321 ifpub = ifp->ifpub;
1322 if (ifpub) {
1323 in6_ifa_hold(ifpub);
1324 spin_unlock_bh(&ifp->lock);
1325 ipv6_create_tempaddr(ifpub, ifp);
1326 in6_ifa_put(ifpub);
1327 } else {
1328 spin_unlock_bh(&ifp->lock);
1329 }
1330 ipv6_del_addr(ifp);
1331#endif
1332 } else
1333 ipv6_del_addr(ifp);
1334}
1335
3c21edbd
YH		 1336void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1337{
1338 if (net_ratelimit())
1339 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340 addrconf_dad_stop(ifp);
1341}
1da177e4
LT		 1342
1343/* Join to solicited addr multicast group. */
1344
1345void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1346{
1347 struct in6_addr maddr;
1348
1349 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1350 return;
1351
1352 addrconf_addr_solict_mult(addr, &maddr);
1353 ipv6_dev_mc_inc(dev, &maddr);
1354}
1355
1356void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1357{
1358 struct in6_addr maddr;
1359
1360 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1361 return;
1362
1363 addrconf_addr_solict_mult(addr, &maddr);
1364 __ipv6_dev_mc_dec(idev, &maddr);
1365}
1366
20380731 1367static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1368{
1369 struct in6_addr addr;
1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371 if (ipv6_addr_any(&addr))
1372 return;
1373 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1374}
1375
20380731 1376static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1377{
1378 struct in6_addr addr;
1379 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380 if (ipv6_addr_any(&addr))
1381 return;
1382 __ipv6_dev_ac_dec(ifp->idev, &addr);
1383}
1384
073a8e0e
YH		 1385static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1386{
1387 if (dev->addr_len != ETH_ALEN)
1388 return -1;
1389 memcpy(eui, dev->dev_addr, 3);
1390 memcpy(eui + 5, dev->dev_addr + 3, 3);
1391
1392 /*
1393 * The zSeries OSA network cards can be shared among various
1394 * OS instances, but the OSA cards have only one MAC address.
1395 * This leads to duplicate address conflicts in conjunction
1396 * with IPv6 if more than one instance uses the same card.
1397 *
1398 * The driver for these cards can deliver a unique 16-bit
1399 * identifier for each instance sharing the same card. It is
1400 * placed instead of 0xFFFE in the interface identifier. The
1401 * "u" bit of the interface identifier is not inverted in this
1402 * case. Hence the resulting interface identifier has local
1403 * scope according to RFC2373.
1404 */
1405 if (dev->dev_id) {
1406 eui[3] = (dev->dev_id >> 8) & 0xFF;
1407 eui[4] = dev->dev_id & 0xFF;
1408 } else {
1409 eui[3] = 0xFF;
1410 eui[4] = 0xFE;
1411 eui[0] ^= 2;
1412 }
1413 return 0;
1414}
1415
1416static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1417{
1418 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419 if (dev->addr_len != ARCNET_ALEN)
1420 return -1;
1421 memset(eui, 0, 7);
1422 eui[7] = *(u8*)dev->dev_addr;
1423 return 0;
1424}
1425
1426static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1427{
1428 if (dev->addr_len != INFINIBAND_ALEN)
1429 return -1;
1430 memcpy(eui, dev->dev_addr + 12, 8);
1431 eui[0] |= 2;
1432 return 0;
1433}
1434
1da177e4
LT		 1435static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1436{
1437 switch (dev->type) {
1438 case ARPHRD_ETHER:
1439 case ARPHRD_FDDI:
1440 case ARPHRD_IEEE802_TR:
073a8e0e 1441 return addrconf_ifid_eui48(eui, dev);
1da177e4 1442 case ARPHRD_ARCNET:
073a8e0e 1443 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1444 case ARPHRD_INFINIBAND:
073a8e0e 1445 return addrconf_ifid_infiniband(eui, dev);
c7dc89c0
FT		 1446 case ARPHRD_SIT:
1447 if (dev->priv_flags & IFF_ISATAP)
1448 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1da177e4
LT		 1449 }
1450 return -1;
1451}
1452
1453static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1454{
1455 int err = -1;
1456 struct inet6_ifaddr *ifp;
1457
1458 read_lock_bh(&idev->lock);
1459 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461 memcpy(eui, ifp->addr.s6_addr+8, 8);
1462 err = 0;
1463 break;
1464 }
1465 }
1466 read_unlock_bh(&idev->lock);
1467 return err;
1468}
1469
1470#ifdef CONFIG_IPV6_PRIVACY
1471/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472static int __ipv6_regen_rndid(struct inet6_dev *idev)
1473{
1da177e4 1474regen:
955189ef 1475 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1476 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1477
1478 /*
1479 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480 * check if generated address is not inappropriate
1481 *
1482 * - Reserved subnet anycast (RFC 2526)
1483 * 11111101 11....11 1xxxxxxx
c7dc89c0 1484 * - ISATAP (RFC4214) 6.1
1da177e4
LT		 1485 * 00-00-5E-FE-xx-xx-xx-xx
1486 * - value 0
1487 * - XXX: already assigned to an address on the device
1488 */
1ab1457c 1489 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1490 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491 (idev->rndid[7]&0x80))
1492 goto regen;
1493 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1495 goto regen;
1496 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1497 goto regen;
1498 }
1499
1500 return 0;
1501}
1502
1503static void ipv6_regen_rndid(unsigned long data)
1504{
1505 struct inet6_dev *idev = (struct inet6_dev *) data;
1506 unsigned long expires;
1507
8814c4b5 1508 rcu_read_lock_bh();
1da177e4
LT		 1509 write_lock_bh(&idev->lock);
1510
1511 if (idev->dead)
1512 goto out;
1513
1514 if (__ipv6_regen_rndid(idev) < 0)
1515 goto out;
1ab1457c 1516
1da177e4 1517 expires = jiffies +
1ab1457c 1518 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1519 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520 if (time_before(expires, jiffies)) {
1521 printk(KERN_WARNING
1522 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1523 idev->dev->name);
1524 goto out;
1525 }
1526
1527 if (!mod_timer(&idev->regen_timer, expires))
1528 in6_dev_hold(idev);
1529
1530out:
1531 write_unlock_bh(&idev->lock);
8814c4b5 1532 rcu_read_unlock_bh();
1da177e4
LT		 1533 in6_dev_put(idev);
1534}
1535
1536static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1537 int ret = 0;
1538
1539 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540 ret = __ipv6_regen_rndid(idev);
1541 return ret;
1542}
1543#endif
1544
1545/*
1546 * Add prefix route.
1547 */
1548
1549static void
1550addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1551 unsigned long expires, u32 flags)
1da177e4 1552{
86872cb5
TG		 1553 struct fib6_config cfg = {
1554 .fc_table = RT6_TABLE_PREFIX,
1555 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556 .fc_ifindex = dev->ifindex,
1557 .fc_expires = expires,
1558 .fc_dst_len = plen,
1559 .fc_flags = RTF_UP | flags,
f1243c2d 1560 .fc_nlinfo.nl_net = &init_net,
86872cb5 1561 };
1da177e4 1562
86872cb5 1563 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1564
1565 /* Prevent useless cloning on PtP SIT.
1566 This thing is done here expecting that the whole
1567 class of non-broadcast devices need not cloning.
1568 */
0be669bb 1569#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1570 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1571 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1572#endif
1da177e4 1573
86872cb5 1574 ip6_route_add(&cfg);
1da177e4
LT		 1575}
1576
1577/* Create "default" multicast route to the interface */
1578
1579static void addrconf_add_mroute(struct net_device *dev)
1580{
86872cb5
TG		 1581 struct fib6_config cfg = {
1582 .fc_table = RT6_TABLE_LOCAL,
1583 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1584 .fc_ifindex = dev->ifindex,
1585 .fc_dst_len = 8,
1586 .fc_flags = RTF_UP,
f1243c2d 1587 .fc_nlinfo.nl_net = &init_net,
86872cb5
TG		 1588 };
1589
1590 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1591
1592 ip6_route_add(&cfg);
1da177e4
LT		 1593}
1594
0be669bb 1595#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1596static void sit_route_add(struct net_device *dev)
1597{
86872cb5
TG		 1598 struct fib6_config cfg = {
1599 .fc_table = RT6_TABLE_MAIN,
1600 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1601 .fc_ifindex = dev->ifindex,
1602 .fc_dst_len = 96,
1603 .fc_flags = RTF_UP | RTF_NONEXTHOP,
f1243c2d 1604 .fc_nlinfo.nl_net = &init_net,
86872cb5 1605 };
1da177e4
LT		 1606
1607 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1608 ip6_route_add(&cfg);
1da177e4 1609}
0be669bb 1610#endif
1da177e4
LT		 1611
1612static void addrconf_add_lroute(struct net_device *dev)
1613{
1614 struct in6_addr addr;
1615
1616 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1617 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1618}
1619
1620static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1621{
1622 struct inet6_dev *idev;
1623
1624 ASSERT_RTNL();
1625
1626 if ((idev = ipv6_find_idev(dev)) == NULL)
1627 return NULL;
1628
1629 /* Add default multicast route */
1630 addrconf_add_mroute(dev);
1631
1632 /* Add link local route */
1633 addrconf_add_lroute(dev);
1634 return idev;
1635}
1636
1637void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1638{
1639 struct prefix_info *pinfo;
1640 __u32 valid_lft;
1641 __u32 prefered_lft;
1642 int addr_type;
1643 unsigned long rt_expires;
1644 struct inet6_dev *in6_dev;
1645
1646 pinfo = (struct prefix_info *) opt;
1ab1457c 1647
1da177e4
LT		 1648 if (len < sizeof(struct prefix_info)) {
1649 ADBG(("addrconf: prefix option too short\n"));
1650 return;
1651 }
1ab1457c 1652
1da177e4
LT		 1653 /*
1654 * Validation checks ([ADDRCONF], page 19)
1655 */
1656
1657 addr_type = ipv6_addr_type(&pinfo->prefix);
1658
1659 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1660 return;
1661
1662 valid_lft = ntohl(pinfo->valid);
1663 prefered_lft = ntohl(pinfo->prefered);
1664
1665 if (prefered_lft > valid_lft) {
1666 if (net_ratelimit())
1667 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1668 return;
1669 }
1670
1671 in6_dev = in6_dev_get(dev);
1672
1673 if (in6_dev == NULL) {
1674 if (net_ratelimit())
1675 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1676 return;
1677 }
1678
1679 /*
1680 * Two things going on here:
1681 * 1) Add routes for on-link prefixes
1682 * 2) Configure prefixes with the auto flag set
1683 */
1684
1685 /* Avoid arithmetic overflow. Really, we could
1686 save rt_expires in seconds, likely valid_lft,
1687 but it would require division in fib gc, that it
1688 not good.
1689 */
1690 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1691 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1692 else
3dd4bc68
YH		 1693 rt_expires = valid_lft * HZ;
1694
1695 /*
1696 * We convert this (in jiffies) to clock_t later.
1697 * Avoid arithmetic overflow there as well.
1698 * Overflow can happen only if HZ < USER_HZ.
1699 */
1700 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1701 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1702
1703 if (pinfo->onlink) {
1704 struct rt6_info *rt;
1705 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1706
1707 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1708 if (rt->rt6i_flags&RTF_EXPIRES) {
1709 if (valid_lft == 0) {
e0a1ad73 1710 ip6_del_rt(rt);
1da177e4
LT		 1711 rt = NULL;
1712 } else {
3dd4bc68 1713 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1714 }
1715 }
1716 } else if (valid_lft) {
1717 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1718 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1719 }
1720 if (rt)
1721 dst_release(&rt->u.dst);
1722 }
1723
1724 /* Try to figure out our local address for this prefix */
1725
1726 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1727 struct inet6_ifaddr * ifp;
1728 struct in6_addr addr;
1729 int create = 0, update_lft = 0;
1730
1731 if (pinfo->prefix_len == 64) {
1732 memcpy(&addr, &pinfo->prefix, 8);
1733 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1734 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1735 in6_dev_put(in6_dev);
1736 return;
1737 }
1738 goto ok;
1739 }
1740 if (net_ratelimit())
1741 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1742 pinfo->prefix_len);
1743 in6_dev_put(in6_dev);
1744 return;
1745
1746ok:
1747
1cab3da6 1748 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1da177e4
LT		 1749
1750 if (ifp == NULL && valid_lft) {
1751 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1752 u32 addr_flags = 0;
1753
1754#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1755 if (in6_dev->cnf.optimistic_dad &&
1756 !ipv6_devconf.forwarding)
1757 addr_flags = IFA_F_OPTIMISTIC;
1758#endif
1da177e4
LT		 1759
1760 /* Do not allow to create too much of autoconfigured
1761 * addresses; this would be too easy way to crash kernel.
1762 */
1763 if (!max_addresses ||
1764 ipv6_count_addresses(in6_dev) < max_addresses)
1765 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1766 addr_type&IPV6_ADDR_SCOPE_MASK,
1767 addr_flags);
1da177e4
LT		 1768
1769 if (!ifp || IS_ERR(ifp)) {
1770 in6_dev_put(in6_dev);
1771 return;
1772 }
1773
1774 update_lft = create = 1;
1775 ifp->cstamp = jiffies;
1776 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1777 }
1778
1779 if (ifp) {
1780 int flags;
1781 unsigned long now;
1782#ifdef CONFIG_IPV6_PRIVACY
1783 struct inet6_ifaddr *ift;
1784#endif
1785 u32 stored_lft;
1786
1787 /* update lifetime (RFC2462 5.5.3 e) */
1788 spin_lock(&ifp->lock);
1789 now = jiffies;
1790 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1791 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1792 else
1793 stored_lft = 0;
1794 if (!update_lft && stored_lft) {
1795 if (valid_lft > MIN_VALID_LIFETIME ||
1796 valid_lft > stored_lft)
1797 update_lft = 1;
1798 else if (stored_lft <= MIN_VALID_LIFETIME) {
1799 /* valid_lft <= stored_lft is always true */
1800 /* XXX: IPsec */
1801 update_lft = 0;
1802 } else {
1803 valid_lft = MIN_VALID_LIFETIME;
1804 if (valid_lft < prefered_lft)
1805 prefered_lft = valid_lft;
1806 update_lft = 1;
1807 }
1808 }
1809
1810 if (update_lft) {
1811 ifp->valid_lft = valid_lft;
1812 ifp->prefered_lft = prefered_lft;
1813 ifp->tstamp = now;
1814 flags = ifp->flags;
1815 ifp->flags &= ~IFA_F_DEPRECATED;
1816 spin_unlock(&ifp->lock);
1817
1818 if (!(flags&IFA_F_TENTATIVE))
1819 ipv6_ifa_notify(0, ifp);
1820 } else
1821 spin_unlock(&ifp->lock);
1822
1823#ifdef CONFIG_IPV6_PRIVACY
1824 read_lock_bh(&in6_dev->lock);
1825 /* update all temporary addresses in the list */
1826 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1827 /*
1828 * When adjusting the lifetimes of an existing
1829 * temporary address, only lower the lifetimes.
1830 * Implementations must not increase the
1831 * lifetimes of an existing temporary address
1832 * when processing a Prefix Information Option.
1833 */
c6fbfac2
BB		 1834 if (ifp != ift->ifpub)
1835 continue;
1836
1da177e4
LT		 1837 spin_lock(&ift->lock);
1838 flags = ift->flags;
1839 if (ift->valid_lft > valid_lft &&
1840 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1841 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1842 if (ift->prefered_lft > prefered_lft &&
1843 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1844 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1845 spin_unlock(&ift->lock);
1846 if (!(flags&IFA_F_TENTATIVE))
1847 ipv6_ifa_notify(0, ift);
1848 }
1849
1850 if (create && in6_dev->cnf.use_tempaddr > 0) {
1851 /*
1852 * When a new public address is created as described in [ADDRCONF],
1853 * also create a new temporary address.
1854 */
1ab1457c 1855 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1856 ipv6_create_tempaddr(ifp, NULL);
1857 } else {
1858 read_unlock_bh(&in6_dev->lock);
1859 }
1860#endif
1861 in6_ifa_put(ifp);
1862 addrconf_verify(0);
1863 }
1864 }
1865 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1866 in6_dev_put(in6_dev);
1867}
1868
1869/*
1870 * Set destination address.
1871 * Special case for SIT interfaces where we create a new "virtual"
1872 * device.
1873 */
1874int addrconf_set_dstaddr(void __user *arg)
1875{
1876 struct in6_ifreq ireq;
1877 struct net_device *dev;
1878 int err = -EINVAL;
1879
1880 rtnl_lock();
1881
1882 err = -EFAULT;
1883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1884 goto err_exit;
1885
881d966b 1886 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1887
1888 err = -ENODEV;
1889 if (dev == NULL)
1890 goto err_exit;
1891
0be669bb 1892#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1893 if (dev->type == ARPHRD_SIT) {
1894 struct ifreq ifr;
1895 mm_segment_t oldfs;
1896 struct ip_tunnel_parm p;
1897
1898 err = -EADDRNOTAVAIL;
1899 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1900 goto err_exit;
1901
1902 memset(&p, 0, sizeof(p));
1903 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1904 p.iph.saddr = 0;
1905 p.iph.version = 4;
1906 p.iph.ihl = 5;
1907 p.iph.protocol = IPPROTO_IPV6;
1908 p.iph.ttl = 64;
d20b3109 1909 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1da177e4
LT		 1910
1911 oldfs = get_fs(); set_fs(KERNEL_DS);
1912 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1913 set_fs(oldfs);
1914
1915 if (err == 0) {
1916 err = -ENOBUFS;
881d966b 1917 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1918 goto err_exit;
1919 err = dev_open(dev);
1920 }
1921 }
0be669bb 1922#endif
1da177e4
LT		 1923
1924err_exit:
1925 rtnl_unlock();
1926 return err;
1927}
1928
1929/*
1930 * Manual configuration of address on an interface
1931 */
0778769d 1932static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1933 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1934{
1935 struct inet6_ifaddr *ifp;
1936 struct inet6_dev *idev;
1937 struct net_device *dev;
1938 int scope;
46d48046 1939 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1940
1941 ASSERT_RTNL();
1ab1457c 1942
0778769d
NT		 1943 /* check the lifetime */
1944 if (!valid_lft || prefered_lft > valid_lft)
1945 return -EINVAL;
1946
881d966b 1947 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1948 return -ENODEV;
1ab1457c 1949
1da177e4
LT		 1950 if ((idev = addrconf_add_dev(dev)) == NULL)
1951 return -ENOBUFS;
1952
1953 scope = ipv6_addr_scope(pfx);
1954
46d48046 1955 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1956 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1957 flags = 0;
1958 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1959 valid_lft = 0x7FFFFFFF/HZ;
1960
1961 if (prefered_lft == 0)
1962 ifa_flags |= IFA_F_DEPRECATED;
1963 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1964 (prefered_lft != INFINITY_LIFE_TIME))
1965 prefered_lft = 0x7FFFFFFF/HZ;
1966
1967 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1968
1da177e4 1969 if (!IS_ERR(ifp)) {
06aebfb7 1970 spin_lock_bh(&ifp->lock);
0778769d
NT		 1971 ifp->valid_lft = valid_lft;
1972 ifp->prefered_lft = prefered_lft;
1973 ifp->tstamp = jiffies;
06aebfb7 1974 spin_unlock_bh(&ifp->lock);
0778769d 1975
46d48046
YH		 1976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1977 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1978 /*
1979 * Note that section 3.1 of RFC 4429 indicates
1980 * that the Optimistic flag should not be set for
1981 * manually configured addresses
1982 */
1da177e4
LT		 1983 addrconf_dad_start(ifp, 0);
1984 in6_ifa_put(ifp);
0778769d 1985 addrconf_verify(0);
1da177e4
LT		 1986 return 0;
1987 }
1988
1989 return PTR_ERR(ifp);
1990}
1991
1992static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1993{
1994 struct inet6_ifaddr *ifp;
1995 struct inet6_dev *idev;
1996 struct net_device *dev;
1ab1457c 1997
881d966b 1998 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1999 return -ENODEV;
2000
2001 if ((idev = __in6_dev_get(dev)) == NULL)
2002 return -ENXIO;
2003
2004 read_lock_bh(&idev->lock);
2005 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2006 if (ifp->prefix_len == plen &&
2007 ipv6_addr_equal(pfx, &ifp->addr)) {
2008 in6_ifa_hold(ifp);
2009 read_unlock_bh(&idev->lock);
1ab1457c 2010
1da177e4
LT		 2011 ipv6_del_addr(ifp);
2012
2013 /* If the last address is deleted administratively,
2014 disable IPv6 on this interface.
2015 */
2016 if (idev->addr_list == NULL)
2017 addrconf_ifdown(idev->dev, 1);
2018 return 0;
2019 }
2020 }
2021 read_unlock_bh(&idev->lock);
2022 return -EADDRNOTAVAIL;
2023}
2024
2025
2026int addrconf_add_ifaddr(void __user *arg)
2027{
2028 struct in6_ifreq ireq;
2029 int err;
1ab1457c 2030
1da177e4
LT		 2031 if (!capable(CAP_NET_ADMIN))
2032 return -EPERM;
1ab1457c 2033
1da177e4
LT		 2034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2035 return -EFAULT;
2036
2037 rtnl_lock();
0778769d 2038 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2039 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2040 rtnl_unlock();
2041 return err;
2042}
2043
2044int addrconf_del_ifaddr(void __user *arg)
2045{
2046 struct in6_ifreq ireq;
2047 int err;
1ab1457c 2048
1da177e4
LT		 2049 if (!capable(CAP_NET_ADMIN))
2050 return -EPERM;
2051
2052 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2053 return -EFAULT;
2054
2055 rtnl_lock();
2056 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2057 rtnl_unlock();
2058 return err;
2059}
2060
0be669bb 2061#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2062static void sit_add_v4_addrs(struct inet6_dev *idev)
2063{
2064 struct inet6_ifaddr * ifp;
2065 struct in6_addr addr;
2066 struct net_device *dev;
2067 int scope;
2068
2069 ASSERT_RTNL();
2070
2071 memset(&addr, 0, sizeof(struct in6_addr));
2072 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2073
2074 if (idev->dev->flags&IFF_POINTOPOINT) {
2075 addr.s6_addr32[0] = htonl(0xfe800000);
2076 scope = IFA_LINK;
2077 } else {
2078 scope = IPV6_ADDR_COMPATv4;
2079 }
2080
2081 if (addr.s6_addr32[3]) {
2082 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2083 if (!IS_ERR(ifp)) {
2084 spin_lock_bh(&ifp->lock);
2085 ifp->flags &= ~IFA_F_TENTATIVE;
2086 spin_unlock_bh(&ifp->lock);
2087 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2088 in6_ifa_put(ifp);
2089 }
2090 return;
2091 }
2092
881d966b 2093 for_each_netdev(&init_net, dev) {
e5ed6399 2094 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2095 if (in_dev && (dev->flags & IFF_UP)) {
2096 struct in_ifaddr * ifa;
2097
2098 int flag = scope;
2099
2100 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2101 int plen;
2102
2103 addr.s6_addr32[3] = ifa->ifa_local;
2104
2105 if (ifa->ifa_scope == RT_SCOPE_LINK)
2106 continue;
2107 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2108 if (idev->dev->flags&IFF_POINTOPOINT)
2109 continue;
2110 flag |= IFA_HOST;
2111 }
2112 if (idev->dev->flags&IFF_POINTOPOINT)
2113 plen = 64;
2114 else
2115 plen = 96;
2116
2117 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2118 IFA_F_PERMANENT);
2119 if (!IS_ERR(ifp)) {
2120 spin_lock_bh(&ifp->lock);
2121 ifp->flags &= ~IFA_F_TENTATIVE;
2122 spin_unlock_bh(&ifp->lock);
2123 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2124 in6_ifa_put(ifp);
2125 }
2126 }
2127 }
1ab1457c 2128 }
1da177e4 2129}
0be669bb 2130#endif
1da177e4
LT		 2131
2132static void init_loopback(struct net_device *dev)
2133{
2134 struct inet6_dev *idev;
2135 struct inet6_ifaddr * ifp;
2136
2137 /* ::1 */
2138
2139 ASSERT_RTNL();
2140
2141 if ((idev = ipv6_find_idev(dev)) == NULL) {
2142 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2143 return;
2144 }
2145
2146 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2147 if (!IS_ERR(ifp)) {
2148 spin_lock_bh(&ifp->lock);
2149 ifp->flags &= ~IFA_F_TENTATIVE;
2150 spin_unlock_bh(&ifp->lock);
2151 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2152 in6_ifa_put(ifp);
2153 }
2154}
2155
2156static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2157{
2158 struct inet6_ifaddr * ifp;
95c385b4
NH		 2159 u32 addr_flags = IFA_F_PERMANENT;
2160
2161#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2162 if (idev->cnf.optimistic_dad &&
2163 !ipv6_devconf.forwarding)
2164 addr_flags |= IFA_F_OPTIMISTIC;
2165#endif
1da177e4 2166
95c385b4
NH		 2167
2168 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2169 if (!IS_ERR(ifp)) {
46d48046 2170 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2171 addrconf_dad_start(ifp, 0);
2172 in6_ifa_put(ifp);
2173 }
2174}
2175
2176static void addrconf_dev_config(struct net_device *dev)
2177{
2178 struct in6_addr addr;
2179 struct inet6_dev * idev;
2180
2181 ASSERT_RTNL();
2182
74235a25
HX		 2183 if ((dev->type != ARPHRD_ETHER) &&
2184 (dev->type != ARPHRD_FDDI) &&
2185 (dev->type != ARPHRD_IEEE802_TR) &&
2186 (dev->type != ARPHRD_ARCNET) &&
2187 (dev->type != ARPHRD_INFINIBAND)) {
2188 /* Alas, we support only Ethernet autoconfiguration. */
2189 return;
2190 }
2191
1da177e4
LT		 2192 idev = addrconf_add_dev(dev);
2193 if (idev == NULL)
2194 return;
2195
2196 memset(&addr, 0, sizeof(struct in6_addr));
2197 addr.s6_addr32[0] = htonl(0xFE800000);
2198
2199 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2200 addrconf_add_linklocal(idev, &addr);
2201}
2202
0be669bb 2203#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2204static void addrconf_sit_config(struct net_device *dev)
2205{
2206 struct inet6_dev *idev;
2207
2208 ASSERT_RTNL();
2209
1ab1457c
YH		 2210 /*
2211 * Configure the tunnel with one of our IPv4
2212 * addresses... we should configure all of
1da177e4
LT		 2213 * our v4 addrs in the tunnel
2214 */
2215
2216 if ((idev = ipv6_find_idev(dev)) == NULL) {
2217 printk(KERN_DEBUG "init sit: add_dev failed\n");
2218 return;
2219 }
2220
c7dc89c0
FT		 2221 if (dev->priv_flags & IFF_ISATAP) {
2222 struct in6_addr addr;
2223
2224 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2225 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2226 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2227 addrconf_add_linklocal(idev, &addr);
2228 return;
2229 }
2230
1da177e4
LT		 2231 sit_add_v4_addrs(idev);
2232
2233 if (dev->flags&IFF_POINTOPOINT) {
2234 addrconf_add_mroute(dev);
2235 addrconf_add_lroute(dev);
2236 } else
2237 sit_route_add(dev);
2238}
0be669bb 2239#endif
1da177e4
LT		 2240
2241static inline int
2242ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2243{
2244 struct in6_addr lladdr;
2245
95c385b4 2246 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2247 addrconf_add_linklocal(idev, &lladdr);
2248 return 0;
2249 }
2250 return -1;
2251}
2252
2253static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2254{
2255 struct net_device *link_dev;
2256
2257 /* first try to inherit the link-local address from the link device */
2258 if (idev->dev->iflink &&
881d966b 2259 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2260 if (!ipv6_inherit_linklocal(idev, link_dev))
2261 return;
2262 }
2263 /* then try to inherit it from any device */
881d966b 2264 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2265 if (!ipv6_inherit_linklocal(idev, link_dev))
2266 return;
2267 }
2268 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2269}
2270
2271/*
2272 * Autoconfigure tunnel with a link-local address so routing protocols,
2273 * DHCPv6, MLD etc. can be run over the virtual link
2274 */
2275
2276static void addrconf_ip6_tnl_config(struct net_device *dev)
2277{
2278 struct inet6_dev *idev;
2279
2280 ASSERT_RTNL();
2281
2282 if ((idev = addrconf_add_dev(dev)) == NULL) {
2283 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2284 return;
2285 }
2286 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2287}
2288
1ab1457c 2289static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2290 void * data)
2291{
2292 struct net_device *dev = (struct net_device *) data;
74235a25 2293 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2294 int run_pending = 0;
b217d616 2295 int err;
1da177e4 2296
e9dc8653
EB		 2297 if (dev->nd_net != &init_net)
2298 return NOTIFY_DONE;
2299
1da177e4 2300 switch(event) {
45ba9dd2 2301 case NETDEV_REGISTER:
74235a25 2302 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2303 idev = ipv6_add_dev(dev);
2304 if (!idev)
b217d616 2305 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2306 }
2307 break;
1da177e4 2308 case NETDEV_UP:
3c21edbd 2309 case NETDEV_CHANGE:
c2edacf8
JV		 2310 if (dev->flags & IFF_SLAVE)
2311 break;
2312
3c21edbd 2313 if (event == NETDEV_UP) {
f24e3d65 2314 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2315 /* device is not ready yet. */
2316 printk(KERN_INFO
2317 "ADDRCONF(NETDEV_UP): %s: "
2318 "link is not ready\n",
2319 dev->name);
2320 break;
2321 }
99081049 2322
d31c7b8f
EP		 2323 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2324 idev = ipv6_add_dev(dev);
2325
99081049
KS		 2326 if (idev)
2327 idev->if_flags |= IF_READY;
3c21edbd 2328 } else {
f24e3d65 2329 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2330 /* device is still not ready. */
2331 break;
2332 }
2333
2334 if (idev) {
2335 if (idev->if_flags & IF_READY) {
2336 /* device is already configured. */
2337 break;
2338 }
2339 idev->if_flags |= IF_READY;
2340 }
2341
2342 printk(KERN_INFO
2343 "ADDRCONF(NETDEV_CHANGE): %s: "
2344 "link becomes ready\n",
2345 dev->name);
2346
c5e33bdd 2347 run_pending = 1;
3c21edbd
YH		 2348 }
2349
1da177e4 2350 switch(dev->type) {
0be669bb 2351#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2352 case ARPHRD_SIT:
2353 addrconf_sit_config(dev);
2354 break;
0be669bb 2355#endif
1da177e4
LT		 2356 case ARPHRD_TUNNEL6:
2357 addrconf_ip6_tnl_config(dev);
2358 break;
2359 case ARPHRD_LOOPBACK:
2360 init_loopback(dev);
2361 break;
2362
2363 default:
2364 addrconf_dev_config(dev);
2365 break;
3ff50b79 2366 }
1da177e4 2367 if (idev) {
c5e33bdd
YH		 2368 if (run_pending)
2369 addrconf_dad_run(idev);
2370
1da177e4
LT		 2371 /* If the MTU changed during the interface down, when the
2372 interface up, the changed MTU must be reflected in the
2373 idev as well as routers.
2374 */
2375 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2376 rt6_mtu_change(dev, dev->mtu);
2377 idev->cnf.mtu6 = dev->mtu;
2378 }
2379 idev->tstamp = jiffies;
2380 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2381 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2382 stop IPv6 on this interface.
2383 */
2384 if (dev->mtu < IPV6_MIN_MTU)
2385 addrconf_ifdown(dev, event != NETDEV_DOWN);
2386 }
2387 break;
2388
2389 case NETDEV_CHANGEMTU:
d31c7b8f 2390 if (idev && dev->mtu >= IPV6_MIN_MTU) {
1da177e4
LT		 2391 rt6_mtu_change(dev, dev->mtu);
2392 idev->cnf.mtu6 = dev->mtu;
2393 break;
2394 }
2395
d31c7b8f
EP		 2396 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2397 idev = ipv6_add_dev(dev);
2398 if (idev)
2399 break;
2400 }
2401
1da177e4
LT		 2402 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2403
2404 case NETDEV_DOWN:
2405 case NETDEV_UNREGISTER:
2406 /*
2407 * Remove all addresses from this interface.
2408 */
2409 addrconf_ifdown(dev, event != NETDEV_DOWN);
2410 break;
3c21edbd 2411
1da177e4 2412 case NETDEV_CHANGENAME:
1da177e4 2413 if (idev) {
5632c515 2414 snmp6_unregister_dev(idev);
408c4768 2415 addrconf_sysctl_unregister(idev);
f52295a9 2416 addrconf_sysctl_register(idev);
b217d616
HX		 2417 err = snmp6_register_dev(idev);
2418 if (err)
2419 return notifier_from_errno(err);
5632c515 2420 }
1da177e4 2421 break;
3ff50b79 2422 }
1da177e4
LT		 2423
2424 return NOTIFY_OK;
2425}
2426
2427/*
2428 * addrconf module should be notified of a device going up
2429 */
2430static struct notifier_block ipv6_dev_notf = {
2431 .notifier_call = addrconf_notify,
2432 .priority = 0
2433};
2434
2435static int addrconf_ifdown(struct net_device *dev, int how)
2436{
2437 struct inet6_dev *idev;
2438 struct inet6_ifaddr *ifa, **bifa;
2439 int i;
2440
2441 ASSERT_RTNL();
2442
2774c7ab 2443 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2444 how = 0;
2445
2446 rt6_ifdown(dev);
2447 neigh_ifdown(&nd_tbl, dev);
2448
2449 idev = __in6_dev_get(dev);
2450 if (idev == NULL)
2451 return -ENODEV;
2452
2453 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2454 Do not dev_put!
1da177e4
LT		 2455 */
2456 if (how == 1) {
1da177e4 2457 idev->dead = 1;
8814c4b5
YH		 2458
2459 /* protected by rtnl_lock */
2460 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2461
2462 /* Step 1.5: remove snmp6 entry */
2463 snmp6_unregister_dev(idev);
2464
2465 }
2466
2467 /* Step 2: clear hash table */
2468 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2469 bifa = &inet6_addr_lst[i];
2470
2471 write_lock_bh(&addrconf_hash_lock);
2472 while ((ifa = *bifa) != NULL) {
2473 if (ifa->idev == idev) {
2474 *bifa = ifa->lst_next;
2475 ifa->lst_next = NULL;
2476 addrconf_del_timer(ifa);
2477 in6_ifa_put(ifa);
2478 continue;
2479 }
2480 bifa = &ifa->lst_next;
2481 }
2482 write_unlock_bh(&addrconf_hash_lock);
2483 }
2484
2485 write_lock_bh(&idev->lock);
2486
2487 /* Step 3: clear flags for stateless addrconf */
2488 if (how != 1)
3c21edbd 2489 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2490
2491 /* Step 4: clear address list */
2492#ifdef CONFIG_IPV6_PRIVACY
2493 if (how == 1 && del_timer(&idev->regen_timer))
2494 in6_dev_put(idev);
2495
2496 /* clear tempaddr list */
2497 while ((ifa = idev->tempaddr_list) != NULL) {
2498 idev->tempaddr_list = ifa->tmp_next;
2499 ifa->tmp_next = NULL;
2500 ifa->dead = 1;
2501 write_unlock_bh(&idev->lock);
2502 spin_lock_bh(&ifa->lock);
2503
2504 if (ifa->ifpub) {
2505 in6_ifa_put(ifa->ifpub);
2506 ifa->ifpub = NULL;
2507 }
2508 spin_unlock_bh(&ifa->lock);
2509 in6_ifa_put(ifa);
2510 write_lock_bh(&idev->lock);
2511 }
2512#endif
2513 while ((ifa = idev->addr_list) != NULL) {
2514 idev->addr_list = ifa->if_next;
2515 ifa->if_next = NULL;
2516 ifa->dead = 1;
2517 addrconf_del_timer(ifa);
2518 write_unlock_bh(&idev->lock);
2519
2520 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2521 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2522 in6_ifa_put(ifa);
2523
2524 write_lock_bh(&idev->lock);
2525 }
2526 write_unlock_bh(&idev->lock);
2527
2528 /* Step 5: Discard multicast list */
2529
2530 if (how == 1)
2531 ipv6_mc_destroy_dev(idev);
2532 else
2533 ipv6_mc_down(idev);
2534
1da177e4 2535 idev->tstamp = jiffies;
1ab1457c 2536
1da177e4
LT		 2537 /* Shot the device (if unregistered) */
2538
2539 if (how == 1) {
408c4768 2540 addrconf_sysctl_unregister(idev);
1da177e4
LT		 2541 neigh_parms_release(&nd_tbl, idev->nd_parms);
2542 neigh_ifdown(&nd_tbl, dev);
2543 in6_dev_put(idev);
2544 }
2545 return 0;
2546}
2547
2548static void addrconf_rs_timer(unsigned long data)
2549{
2550 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2551
2552 if (ifp->idev->cnf.forwarding)
2553 goto out;
2554
2555 if (ifp->idev->if_flags & IF_RA_RCVD) {
2556 /*
2557 * Announcement received after solicitation
2558 * was sent
2559 */
2560 goto out;
2561 }
2562
2563 spin_lock(&ifp->lock);
2564 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2565 struct in6_addr all_routers;
2566
2567 /* The wait after the last probe can be shorter */
2568 addrconf_mod_timer(ifp, AC_RS,
2569 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2570 ifp->idev->cnf.rtr_solicit_delay :
2571 ifp->idev->cnf.rtr_solicit_interval);
2572 spin_unlock(&ifp->lock);
2573
2574 ipv6_addr_all_routers(&all_routers);
2575
2576 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2577 } else {
2578 spin_unlock(&ifp->lock);
2579 /*
2580 * Note: we do not support deprecated "all on-link"
2581 * assumption any longer.
2582 */
2583 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2584 ifp->idev->dev->name);
2585 }
2586
2587out:
2588 in6_ifa_put(ifp);
2589}
2590
2591/*
2592 * Duplicate Address Detection
2593 */
3c21edbd
YH		 2594static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2595{
2596 unsigned long rand_num;
2597 struct inet6_dev *idev = ifp->idev;
2598
95c385b4
NH		 2599 if (ifp->flags & IFA_F_OPTIMISTIC)
2600 rand_num = 0;
2601 else
2602 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2603
3c21edbd
YH		 2604 ifp->probes = idev->cnf.dad_transmits;
2605 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2606}
2607
e431b8c0 2608static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2609{
2610 struct inet6_dev *idev = ifp->idev;
2611 struct net_device *dev = idev->dev;
1da177e4
LT		 2612
2613 addrconf_join_solict(dev, &ifp->addr);
2614
1da177e4 2615 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2616
2617 read_lock_bh(&idev->lock);
2618 if (ifp->dead)
2619 goto out;
2620 spin_lock_bh(&ifp->lock);
2621
2622 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2623 !(ifp->flags&IFA_F_TENTATIVE) ||
2624 ifp->flags & IFA_F_NODAD) {
95c385b4 2625 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2626 spin_unlock_bh(&ifp->lock);
2627 read_unlock_bh(&idev->lock);
2628
2629 addrconf_dad_completed(ifp);
2630 return;
2631 }
2632
6732bade 2633 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2634 spin_unlock_bh(&ifp->lock);
6732bade 2635 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2636 /*
2637 * If the defice is not ready:
2638 * - keep it tentative if it is a permanent address.
2639 * - otherwise, kill it.
2640 */
2641 in6_ifa_hold(ifp);
2642 addrconf_dad_stop(ifp);
6732bade 2643 return;
3c21edbd 2644 }
95c385b4
NH		 2645
2646 /*
2647 * Optimistic nodes can start receiving
2648 * Frames right away
2649 */
2650 if(ifp->flags & IFA_F_OPTIMISTIC)
2651 ip6_ins_rt(ifp->rt);
2652
6732bade
YH		 2653 addrconf_dad_kick(ifp);
2654 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2655out:
2656 read_unlock_bh(&idev->lock);
2657}
2658
2659static void addrconf_dad_timer(unsigned long data)
2660{
2661 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2662 struct inet6_dev *idev = ifp->idev;
2663 struct in6_addr unspec;
2664 struct in6_addr mcaddr;
2665
2666 read_lock_bh(&idev->lock);
2667 if (idev->dead) {
2668 read_unlock_bh(&idev->lock);
2669 goto out;
2670 }
2671 spin_lock_bh(&ifp->lock);
2672 if (ifp->probes == 0) {
2673 /*
2674 * DAD was successful
2675 */
2676
95c385b4 2677 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2678 spin_unlock_bh(&ifp->lock);
2679 read_unlock_bh(&idev->lock);
2680
2681 addrconf_dad_completed(ifp);
2682
2683 goto out;
2684 }
2685
2686 ifp->probes--;
2687 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2688 spin_unlock_bh(&ifp->lock);
2689 read_unlock_bh(&idev->lock);
2690
2691 /* send a neighbour solicitation for our addr */
2692 memset(&unspec, 0, sizeof(unspec));
2693 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2694 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2695out:
2696 in6_ifa_put(ifp);
2697}
2698
2699static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2700{
2701 struct net_device * dev = ifp->idev->dev;
2702
2703 /*
2704 * Configure the address for reception. Now it is valid.
2705 */
2706
2707 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2708
2709 /* If added prefix is link local and forwarding is off,
2710 start sending router solicitations.
2711 */
2712
2713 if (ifp->idev->cnf.forwarding == 0 &&
2714 ifp->idev->cnf.rtr_solicits > 0 &&
2715 (dev->flags&IFF_LOOPBACK) == 0 &&
2716 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2717 struct in6_addr all_routers;
2718
2719 ipv6_addr_all_routers(&all_routers);
2720
2721 /*
2722 * If a host as already performed a random delay
2723 * [...] as part of DAD [...] there is no need
2724 * to delay again before sending the first RS
2725 */
2726 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2727
2728 spin_lock_bh(&ifp->lock);
2729 ifp->probes = 1;
2730 ifp->idev->if_flags |= IF_RS_SENT;
2731 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2732 spin_unlock_bh(&ifp->lock);
2733 }
2734}
2735
c5e33bdd
YH		 2736static void addrconf_dad_run(struct inet6_dev *idev) {
2737 struct inet6_ifaddr *ifp;
2738
2739 read_lock_bh(&idev->lock);
2740 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2741 spin_lock_bh(&ifp->lock);
2742 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2743 spin_unlock_bh(&ifp->lock);
2744 continue;
2745 }
2746 spin_unlock_bh(&ifp->lock);
2747 addrconf_dad_kick(ifp);
2748 }
2749 read_unlock_bh(&idev->lock);
2750}
2751
1da177e4
LT		 2752#ifdef CONFIG_PROC_FS
2753struct if6_iter_state {
3c40090a 2754 struct seq_net_private p;
1da177e4
LT		 2755 int bucket;
2756};
2757
2758static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2759{
2760 struct inet6_ifaddr *ifa = NULL;
2761 struct if6_iter_state *state = seq->private;
3c40090a 2762 struct net *net = state->p.net;
1da177e4
LT		 2763
2764 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2765 ifa = inet6_addr_lst[state->bucket];
3c40090a
DL		 2766
2767 while (ifa && ifa->idev->dev->nd_net != net)
2768 ifa = ifa->lst_next;
1da177e4
LT		 2769 if (ifa)
2770 break;
2771 }
2772 return ifa;
2773}
2774
2775static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2776{
2777 struct if6_iter_state *state = seq->private;
3c40090a 2778 struct net *net = state->p.net;
1da177e4
LT		 2779
2780 ifa = ifa->lst_next;
2781try_again:
3c40090a
DL		 2782 if (ifa) {
2783 if (ifa->idev->dev->nd_net != net) {
2784 ifa = ifa->lst_next;
2785 goto try_again;
2786 }
2787 }
2788
1da177e4
LT		 2789 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2790 ifa = inet6_addr_lst[state->bucket];
2791 goto try_again;
2792 }
3c40090a 2793
1da177e4
LT		 2794 return ifa;
2795}
2796
2797static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2798{
2799 struct inet6_ifaddr *ifa = if6_get_first(seq);
2800
2801 if (ifa)
2802 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2803 --pos;
2804 return pos ? NULL : ifa;
2805}
2806
2807static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
d20b3109 2808 __acquires(addrconf_hash_lock)
1da177e4
LT		 2809{
2810 read_lock_bh(&addrconf_hash_lock);
2811 return if6_get_idx(seq, *pos);
2812}
2813
2814static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2815{
2816 struct inet6_ifaddr *ifa;
2817
2818 ifa = if6_get_next(seq, v);
2819 ++*pos;
2820 return ifa;
2821}
2822
2823static void if6_seq_stop(struct seq_file *seq, void *v)
d20b3109 2824 __releases(addrconf_hash_lock)
1da177e4
LT		 2825{
2826 read_unlock_bh(&addrconf_hash_lock);
2827}
2828
2829static int if6_seq_show(struct seq_file *seq, void *v)
2830{
2831 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2832 seq_printf(seq,
9343e79a 2833 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2834 NIP6(ifp->addr),
2835 ifp->idev->dev->ifindex,
2836 ifp->prefix_len,
2837 ifp->scope,
2838 ifp->flags,
2839 ifp->idev->dev->name);
2840 return 0;
2841}
2842
56b3d975 2843static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2844 .start = if6_seq_start,
2845 .next = if6_seq_next,
2846 .show = if6_seq_show,
2847 .stop = if6_seq_stop,
2848};
2849
2850static int if6_seq_open(struct inode *inode, struct file *file)
2851{
3c40090a
DL		 2852 return seq_open_net(inode, file, &if6_seq_ops,
2853 sizeof(struct if6_iter_state));
1da177e4
LT		 2854}
2855
9a32144e 2856static const struct file_operations if6_fops = {
1da177e4
LT		 2857 .owner = THIS_MODULE,
2858 .open = if6_seq_open,
2859 .read = seq_read,
2860 .llseek = seq_lseek,
3c40090a 2861 .release = seq_release_net,
1da177e4
LT		 2862};
2863
3c40090a 2864static int if6_proc_net_init(struct net *net)
1da177e4 2865{
3c40090a 2866 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2867 return -ENOMEM;
2868 return 0;
2869}
2870
3c40090a
DL		 2871static void if6_proc_net_exit(struct net *net)
2872{
2873 proc_net_remove(net, "if_inet6");
2874}
2875
2876static struct pernet_operations if6_proc_net_ops = {
2877 .init = if6_proc_net_init,
2878 .exit = if6_proc_net_exit,
2879};
2880
2881int __init if6_proc_init(void)
2882{
2883 return register_pernet_subsys(&if6_proc_net_ops);
2884}
2885
1da177e4
LT		 2886void if6_proc_exit(void)
2887{
3c40090a 2888 unregister_pernet_subsys(&if6_proc_net_ops);
1da177e4
LT		 2889}
2890#endif /* CONFIG_PROC_FS */
2891
59fbb3a6 2892#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c 2893/* Check if address is a home address configured on any interface. */
389f6612 2894int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3b9f9a1c
NT		 2895{
2896 int ret = 0;
2897 struct inet6_ifaddr * ifp;
2898 u8 hash = ipv6_addr_hash(addr);
2899 read_lock_bh(&addrconf_hash_lock);
2900 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
389f6612
DL		 2901 if (ifp->idev->dev->nd_net != net)
2902 continue;
3b9f9a1c
NT		 2903 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2904 (ifp->flags & IFA_F_HOMEADDRESS)) {
2905 ret = 1;
2906 break;
2907 }
2908 }
2909 read_unlock_bh(&addrconf_hash_lock);
2910 return ret;
2911}
2912#endif
2913
1da177e4
LT		 2914/*
2915 * Periodic address status verification
2916 */
2917
2918static void addrconf_verify(unsigned long foo)
2919{
2920 struct inet6_ifaddr *ifp;
2921 unsigned long now, next;
2922 int i;
2923
2924 spin_lock_bh(&addrconf_verify_lock);
2925 now = jiffies;
2926 next = now + ADDR_CHECK_FREQUENCY;
2927
2928 del_timer(&addr_chk_timer);
2929
2930 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2931
2932restart:
5d5780df 2933 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2934 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2935 unsigned long age;
2936#ifdef CONFIG_IPV6_PRIVACY
2937 unsigned long regen_advance;
2938#endif
2939
2940 if (ifp->flags & IFA_F_PERMANENT)
2941 continue;
2942
2943 spin_lock(&ifp->lock);
2944 age = (now - ifp->tstamp) / HZ;
2945
2946#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2947 regen_advance = ifp->idev->cnf.regen_max_retry *
2948 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2949 ifp->idev->nd_parms->retrans_time / HZ;
2950#endif
2951
8f27ebb9
YH		 2952 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2953 age >= ifp->valid_lft) {
1da177e4
LT		 2954 spin_unlock(&ifp->lock);
2955 in6_ifa_hold(ifp);
5d5780df 2956 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2957 ipv6_del_addr(ifp);
2958 goto restart;
8f27ebb9
YH		 2959 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2960 spin_unlock(&ifp->lock);
2961 continue;
1da177e4
LT		 2962 } else if (age >= ifp->prefered_lft) {
2963 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2964 int deprecate = 0;
2965
2966 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2967 deprecate = 1;
2968 ifp->flags |= IFA_F_DEPRECATED;
2969 }
2970
2971 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2972 next = ifp->tstamp + ifp->valid_lft * HZ;
2973
2974 spin_unlock(&ifp->lock);
2975
2976 if (deprecate) {
2977 in6_ifa_hold(ifp);
5d5780df 2978 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2979
2980 ipv6_ifa_notify(0, ifp);
2981 in6_ifa_put(ifp);
2982 goto restart;
2983 }
2984#ifdef CONFIG_IPV6_PRIVACY
2985 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2986 !(ifp->flags&IFA_F_TENTATIVE)) {
2987 if (age >= ifp->prefered_lft - regen_advance) {
2988 struct inet6_ifaddr *ifpub = ifp->ifpub;
2989 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2990 next = ifp->tstamp + ifp->prefered_lft * HZ;
2991 if (!ifp->regen_count && ifpub) {
2992 ifp->regen_count++;
2993 in6_ifa_hold(ifp);
2994 in6_ifa_hold(ifpub);
2995 spin_unlock(&ifp->lock);
5d5780df 2996 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2997 spin_lock(&ifpub->lock);
2998 ifpub->regen_count = 0;
2999 spin_unlock(&ifpub->lock);
1da177e4
LT		 3000 ipv6_create_tempaddr(ifpub, ifp);
3001 in6_ifa_put(ifpub);
3002 in6_ifa_put(ifp);
3003 goto restart;
3004 }
3005 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3006 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3007 spin_unlock(&ifp->lock);
3008#endif
3009 } else {
3010 /* ifp->prefered_lft <= ifp->valid_lft */
3011 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3012 next = ifp->tstamp + ifp->prefered_lft * HZ;
3013 spin_unlock(&ifp->lock);
3014 }
3015 }
5d5780df 3016 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 3017 }
3018
3019 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3020 add_timer(&addr_chk_timer);
3021 spin_unlock_bh(&addrconf_verify_lock);
3022}
3023
461d8837
TG		 3024static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3025{
3026 struct in6_addr *pfx = NULL;
3027
3028 if (addr)
3029 pfx = nla_data(addr);
3030
3031 if (local) {
3032 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3033 pfx = NULL;
3034 else
3035 pfx = nla_data(local);
3036 }
3037
3038 return pfx;
3039}
3040
ef7c79ed 3041static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 3042 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3043 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3044 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3045};
3046
1da177e4
LT		 3047static int
3048inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3049{
b854272b 3050 struct net *net = skb->sk->sk_net;
b933f716
TG		 3051 struct ifaddrmsg *ifm;
3052 struct nlattr *tb[IFA_MAX+1];
1da177e4 3053 struct in6_addr *pfx;
b933f716 3054 int err;
1da177e4 3055
b854272b
DL		 3056 if (net != &init_net)
3057 return -EINVAL;
3058
b933f716
TG		 3059 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3060 if (err < 0)
3061 return err;
3062
3063 ifm = nlmsg_data(nlh);
3064 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3065 if (pfx == NULL)
3066 return -EINVAL;
3067
3068 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3069}
3070
55ebaef1
NT		 3071static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3072 u32 prefered_lft, u32 valid_lft)
081bba5b 3073{
46d48046
YH		 3074 u32 flags = RTF_EXPIRES;
3075
081bba5b
NT		 3076 if (!valid_lft || (prefered_lft > valid_lft))
3077 return -EINVAL;
3078
46d48046 3079 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3080 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3081 flags = 0;
3082 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3083 valid_lft = 0x7FFFFFFF/HZ;
3084
3085 if (prefered_lft == 0)
55ebaef1 3086 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3087 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3088 (prefered_lft != INFINITY_LIFE_TIME))
3089 prefered_lft = 0x7FFFFFFF/HZ;
3090
3091 spin_lock_bh(&ifp->lock);
3b9f9a1c 3092 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3093 ifp->tstamp = jiffies;
3094 ifp->valid_lft = valid_lft;
3095 ifp->prefered_lft = prefered_lft;
3096
3097 spin_unlock_bh(&ifp->lock);
3098 if (!(ifp->flags&IFA_F_TENTATIVE))
3099 ipv6_ifa_notify(0, ifp);
081bba5b 3100
46d48046
YH		 3101 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3102 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3103 addrconf_verify(0);
3104
3105 return 0;
3106}
3107
1da177e4
LT		 3108static int
3109inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3110{
b854272b 3111 struct net *net = skb->sk->sk_net;
461d8837
TG		 3112 struct ifaddrmsg *ifm;
3113 struct nlattr *tb[IFA_MAX+1];
1da177e4 3114 struct in6_addr *pfx;
7198f8ce
TG		 3115 struct inet6_ifaddr *ifa;
3116 struct net_device *dev;
55ebaef1
NT		 3117 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3118 u8 ifa_flags;
461d8837 3119 int err;
1da177e4 3120
b854272b
DL		 3121 if (net != &init_net)
3122 return -EINVAL;
3123
461d8837
TG		 3124 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3125 if (err < 0)
3126 return err;
3127
3128 ifm = nlmsg_data(nlh);
3129 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3130 if (pfx == NULL)
3131 return -EINVAL;
3132
461d8837 3133 if (tb[IFA_CACHEINFO]) {
0778769d 3134 struct ifa_cacheinfo *ci;
461d8837
TG		 3135
3136 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3137 valid_lft = ci->ifa_valid;
461d8837
TG		 3138 preferred_lft = ci->ifa_prefered;
3139 } else {
3140 preferred_lft = INFINITY_LIFE_TIME;
3141 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3142 }
3143
881d966b 3144 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3145 if (dev == NULL)
3146 return -ENODEV;
3147
55ebaef1 3148 /* We ignore other flags so far. */
3b9f9a1c 3149 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3150
1cab3da6 3151 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
7198f8ce
TG		 3152 if (ifa == NULL) {
3153 /*
3154 * It would be best to check for !NLM_F_CREATE here but
3155 * userspace alreay relies on not having to provide this.
3156 */
3157 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3158 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3159 }
3160
7198f8ce
TG		 3161 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3162 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3163 err = -EEXIST;
3164 else
55ebaef1 3165 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3166
3167 in6_ifa_put(ifa);
3168
3169 return err;
1da177e4
LT		 3170}
3171
101bb229
TG		 3172static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3173 u8 scope, int ifindex)
3174{
3175 struct ifaddrmsg *ifm;
3176
3177 ifm = nlmsg_data(nlh);
3178 ifm->ifa_family = AF_INET6;
3179 ifm->ifa_prefixlen = prefixlen;
3180 ifm->ifa_flags = flags;
3181 ifm->ifa_scope = scope;
3182 ifm->ifa_index = ifindex;
3183}
3184
85486af0
TG		 3185static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3186 unsigned long tstamp, u32 preferred, u32 valid)
3187{
3188 struct ifa_cacheinfo ci;
3189
3190 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3191 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3192 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3193 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3194 ci.ifa_prefered = preferred;
3195 ci.ifa_valid = valid;
3196
3197 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3198}
3199
101bb229
TG		 3200static inline int rt_scope(int ifa_scope)
3201{
3202 if (ifa_scope & IFA_HOST)
3203 return RT_SCOPE_HOST;
3204 else if (ifa_scope & IFA_LINK)
3205 return RT_SCOPE_LINK;
3206 else if (ifa_scope & IFA_SITE)
3207 return RT_SCOPE_SITE;
3208 else
3209 return RT_SCOPE_UNIVERSE;
3210}
3211
0ab6803b
TG		 3212static inline int inet6_ifaddr_msgsize(void)
3213{
339bf98f
TG		 3214 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3215 + nla_total_size(16) /* IFA_ADDRESS */
3216 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3217}
c5396a31 3218
1da177e4 3219static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3220 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3221{
1da177e4 3222 struct nlmsghdr *nlh;
85486af0 3223 u32 preferred, valid;
1da177e4 3224
0ab6803b
TG		 3225 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3226 if (nlh == NULL)
26932566 3227 return -EMSGSIZE;
0ab6803b 3228
101bb229
TG		 3229 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3230 ifa->idev->dev->ifindex);
3231
1da177e4 3232 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3233 preferred = ifa->prefered_lft;
3234 valid = ifa->valid_lft;
3235 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3236 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3237 preferred -= tval;
3238 if (valid != INFINITY_LIFE_TIME)
3239 valid -= tval;
1da177e4
LT		 3240 }
3241 } else {
85486af0
TG		 3242 preferred = INFINITY_LIFE_TIME;
3243 valid = INFINITY_LIFE_TIME;
3244 }
3245
0ab6803b 3246 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3247 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3248 nlmsg_cancel(skb, nlh);
3249 return -EMSGSIZE;
3250 }
1da177e4 3251
0ab6803b 3252 return nlmsg_end(skb, nlh);
1da177e4
LT		 3253}
3254
3255static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3256 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3257{
1da177e4 3258 struct nlmsghdr *nlh;
101bb229
TG		 3259 u8 scope = RT_SCOPE_UNIVERSE;
3260 int ifindex = ifmca->idev->dev->ifindex;
3261
3262 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3263 scope = RT_SCOPE_SITE;
1da177e4 3264
0ab6803b
TG		 3265 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3266 if (nlh == NULL)
26932566 3267 return -EMSGSIZE;
85486af0 3268
0ab6803b
TG		 3269 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3270 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3271 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3272 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3273 nlmsg_cancel(skb, nlh);
3274 return -EMSGSIZE;
3275 }
85486af0 3276
0ab6803b 3277 return nlmsg_end(skb, nlh);
1da177e4
LT		 3278}
3279
3280static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3281 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3282{
1da177e4 3283 struct nlmsghdr *nlh;
101bb229
TG		 3284 u8 scope = RT_SCOPE_UNIVERSE;
3285 int ifindex = ifaca->aca_idev->dev->ifindex;
3286
3287 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3288 scope = RT_SCOPE_SITE;
1da177e4 3289
0ab6803b
TG		 3290 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3291 if (nlh == NULL)
26932566 3292 return -EMSGSIZE;
85486af0 3293
0ab6803b
TG		 3294 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3295 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3296 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3297 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3298 nlmsg_cancel(skb, nlh);
3299 return -EMSGSIZE;
3300 }
1da177e4 3301
0ab6803b 3302 return nlmsg_end(skb, nlh);
1da177e4
LT		 3303}
3304
3305enum addr_type_t
3306{
3307 UNICAST_ADDR,
3308 MULTICAST_ADDR,
3309 ANYCAST_ADDR,
3310};
3311
3312static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3313 enum addr_type_t type)
3314{
3315 int idx, ip_idx;
3316 int s_idx, s_ip_idx;
3317 int err = 1;
3318 struct net_device *dev;
3319 struct inet6_dev *idev = NULL;
3320 struct inet6_ifaddr *ifa;
3321 struct ifmcaddr6 *ifmca;
3322 struct ifacaddr6 *ifaca;
3323
3324 s_idx = cb->args[0];
3325 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3326
7562f876 3327 idx = 0;
881d966b 3328 for_each_netdev(&init_net, dev) {
1da177e4 3329 if (idx < s_idx)
7562f876 3330 goto cont;
1da177e4
LT		 3331 if (idx > s_idx)
3332 s_ip_idx = 0;
3333 ip_idx = 0;
3334 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3335 goto cont;
1da177e4
LT		 3336 read_lock_bh(&idev->lock);
3337 switch (type) {
3338 case UNICAST_ADDR:
ae9cda5d 3339 /* unicast address incl. temp addr */
1da177e4
LT		 3340 for (ifa = idev->addr_list; ifa;
3341 ifa = ifa->if_next, ip_idx++) {
3342 if (ip_idx < s_ip_idx)
3343 continue;
5d5619b4
YH		 3344 err = inet6_fill_ifaddr(skb, ifa,
3345 NETLINK_CB(cb->skb).pid,
3346 cb->nlh->nlmsg_seq,
3347 RTM_NEWADDR,
3348 NLM_F_MULTI);
1da177e4 3349 }
1da177e4
LT		 3350 break;
3351 case MULTICAST_ADDR:
3352 /* multicast address */
1ab1457c 3353 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3354 ifmca = ifmca->next, ip_idx++) {
3355 if (ip_idx < s_ip_idx)
3356 continue;
5d5619b4
YH		 3357 err = inet6_fill_ifmcaddr(skb, ifmca,
3358 NETLINK_CB(cb->skb).pid,
3359 cb->nlh->nlmsg_seq,
3360 RTM_GETMULTICAST,
3361 NLM_F_MULTI);
1da177e4
LT		 3362 }
3363 break;
3364 case ANYCAST_ADDR:
3365 /* anycast address */
3366 for (ifaca = idev->ac_list; ifaca;
3367 ifaca = ifaca->aca_next, ip_idx++) {
3368 if (ip_idx < s_ip_idx)
3369 continue;
5d5619b4
YH		 3370 err = inet6_fill_ifacaddr(skb, ifaca,
3371 NETLINK_CB(cb->skb).pid,
3372 cb->nlh->nlmsg_seq,
3373 RTM_GETANYCAST,
3374 NLM_F_MULTI);
1da177e4
LT		 3375 }
3376 break;
3377 default:
3378 break;
3379 }
3380 read_unlock_bh(&idev->lock);
3381 in6_dev_put(idev);
5d5619b4
YH		 3382
3383 if (err <= 0)
3384 break;
7562f876
PE		 3385cont:
3386 idx++;
1da177e4 3387 }
1da177e4
LT		 3388 cb->args[0] = idx;
3389 cb->args[1] = ip_idx;
3390 return skb->len;
3391}
3392
3393static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3394{
b854272b 3395 struct net *net = skb->sk->sk_net;
1da177e4 3396 enum addr_type_t type = UNICAST_ADDR;
b854272b
DL		 3397
3398 if (net != &init_net)
3399 return 0;
3400
1da177e4
LT		 3401 return inet6_dump_addr(skb, cb, type);
3402}
3403
3404static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3405{
b854272b 3406 struct net *net = skb->sk->sk_net;
1da177e4 3407 enum addr_type_t type = MULTICAST_ADDR;
b854272b
DL		 3408
3409 if (net != &init_net)
3410 return 0;
3411
1da177e4
LT		 3412 return inet6_dump_addr(skb, cb, type);
3413}
3414
3415
3416static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3417{
b854272b 3418 struct net *net = skb->sk->sk_net;
1da177e4 3419 enum addr_type_t type = ANYCAST_ADDR;
b854272b
DL		 3420
3421 if (net != &init_net)
3422 return 0;
3423
1da177e4
LT		 3424 return inet6_dump_addr(skb, cb, type);
3425}
3426
1b29fc2c
TG		 3427static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3428 void *arg)
6c223828 3429{
b854272b 3430 struct net *net = in_skb->sk->sk_net;
1b29fc2c
TG		 3431 struct ifaddrmsg *ifm;
3432 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3433 struct in6_addr *addr = NULL;
3434 struct net_device *dev = NULL;
3435 struct inet6_ifaddr *ifa;
3436 struct sk_buff *skb;
6c223828
NT		 3437 int err;
3438
b854272b
DL		 3439 if (net != &init_net)
3440 return -EINVAL;
3441
1b29fc2c
TG		 3442 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3443 if (err < 0)
3444 goto errout;
3445
3446 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3447 if (addr == NULL) {
3448 err = -EINVAL;
3449 goto errout;
6c223828 3450 }
6c223828 3451
1b29fc2c 3452 ifm = nlmsg_data(nlh);
6c223828 3453 if (ifm->ifa_index)
881d966b 3454 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3455
1cab3da6 3456 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
1b29fc2c
TG		 3457 err = -EADDRNOTAVAIL;
3458 goto errout;
3459 }
6c223828 3460
0ab6803b 3461 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3462 err = -ENOBUFS;
1b29fc2c 3463 goto errout_ifa;
6c223828
NT		 3464 }
3465
6c223828
NT		 3466 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3467 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3468 if (err < 0) {
3469 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3470 WARN_ON(err == -EMSGSIZE);
3471 kfree_skb(skb);
3472 goto errout_ifa;
3473 }
97c53cac 3474 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
1b29fc2c 3475errout_ifa:
6c223828 3476 in6_ifa_put(ifa);
1b29fc2c 3477errout:
6c223828 3478 return err;
6c223828
NT		 3479}
3480
1da177e4
LT		 3481static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3482{
3483 struct sk_buff *skb;
5d620266 3484 int err = -ENOBUFS;
1da177e4 3485
0ab6803b 3486 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3487 if (skb == NULL)
3488 goto errout;
3489
3490 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3491 if (err < 0) {
3492 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3493 WARN_ON(err == -EMSGSIZE);
3494 kfree_skb(skb);
3495 goto errout;
3496 }
97c53cac 3497 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5d620266
TG		 3498errout:
3499 if (err < 0)
97c53cac 3500 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3501}
3502
b6f99a21 3503static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3504 __s32 *array, int bytes)
3505{
04561c1f
TG		 3506 BUG_ON(bytes < (DEVCONF_MAX * 4));
3507
1da177e4
LT		 3508 memset(array, 0, bytes);
3509 array[DEVCONF_FORWARDING] = cnf->forwarding;
3510 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3511 array[DEVCONF_MTU6] = cnf->mtu6;
3512 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3513 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3514 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3515 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3516 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3517 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3518 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3519 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3520#ifdef CONFIG_IPV6_PRIVACY
3521 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3522 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3523 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3524 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3525 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3526#endif
3527 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3528 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3529 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3530#ifdef CONFIG_IPV6_ROUTER_PREF
3531 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3532 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3533#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3534 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3535#endif
930d6ff2 3536#endif
fbea49e1 3537 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3538 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3539#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3540 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3541#endif
1da177e4
LT		 3542}
3543
339bf98f
TG		 3544static inline size_t inet6_if_nlmsg_size(void)
3545{
3546 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3547 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3548 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3549 + nla_total_size(4) /* IFLA_MTU */
3550 + nla_total_size(4) /* IFLA_LINK */
3551 + nla_total_size( /* IFLA_PROTINFO */
3552 nla_total_size(4) /* IFLA_INET6_FLAGS */
3553 + nla_total_size(sizeof(struct ifla_cacheinfo))
3554 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3555 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3556 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3557 );
3558}
c5396a31 3559
7f7d9a6b
HX		 3560static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3561 int bytes)
3562{
3563 int i;
3564 int pad = bytes - sizeof(u64) * items;
3565 BUG_ON(pad < 0);
3566
3567 /* Use put_unaligned() because stats may not be aligned for u64. */
3568 put_unaligned(items, &stats[0]);
3569 for (i = 1; i < items; i++)
3570 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3571
3572 memset(&stats[items], 0, pad);
3573}
3574
3575static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3576 int bytes)
3577{
3578 switch(attrtype) {
3579 case IFLA_INET6_STATS:
3580 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3581 break;
3582 case IFLA_INET6_ICMP6STATS:
3583 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3584 break;
3585 }
3586}
3587
1ab1457c 3588static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3589 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3590{
04561c1f 3591 struct net_device *dev = idev->dev;
bf99f1bd 3592 struct nlattr *nla;
04561c1f
TG		 3593 struct ifinfomsg *hdr;
3594 struct nlmsghdr *nlh;
3595 void *protoinfo;
3596 struct ifla_cacheinfo ci;
3597
3598 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3599 if (nlh == NULL)
26932566 3600 return -EMSGSIZE;
04561c1f
TG		 3601
3602 hdr = nlmsg_data(nlh);
3603 hdr->ifi_family = AF_INET6;
3604 hdr->__ifi_pad = 0;
3605 hdr->ifi_type = dev->type;
3606 hdr->ifi_index = dev->ifindex;
3607 hdr->ifi_flags = dev_get_flags(dev);
3608 hdr->ifi_change = 0;
3609
3610 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3611
3612 if (dev->addr_len)
04561c1f 3613 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3614
04561c1f 3615 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3616 if (dev->ifindex != dev->iflink)
04561c1f 3617 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3618
04561c1f
TG		 3619 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3620 if (protoinfo == NULL)
3621 goto nla_put_failure;
1da177e4 3622
04561c1f 3623 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3624
1da177e4
LT		 3625 ci.max_reasm_len = IPV6_MAXPLEN;
3626 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3627 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3628 ci.reachable_time = idev->nd_parms->reachable_time;
3629 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3630 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3631
bf99f1bd
YH		 3632 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3633 if (nla == NULL)
04561c1f 3634 goto nla_put_failure;
bf99f1bd 3635 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3636
bf99f1bd
YH		 3637 /* XXX - MC not implemented */
3638
3639 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3640 if (nla == NULL)
3641 goto nla_put_failure;
3642 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3643
3644 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3645 if (nla == NULL)
3646 goto nla_put_failure;
3647 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3648
04561c1f
TG		 3649 nla_nest_end(skb, protoinfo);
3650 return nlmsg_end(skb, nlh);
1da177e4 3651
04561c1f 3652nla_put_failure:
26932566
PM		 3653 nlmsg_cancel(skb, nlh);
3654 return -EMSGSIZE;
1da177e4
LT		 3655}
3656
3657static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3658{
b854272b 3659 struct net *net = skb->sk->sk_net;
1da177e4
LT		 3660 int idx, err;
3661 int s_idx = cb->args[0];
3662 struct net_device *dev;
3663 struct inet6_dev *idev;
3664
b854272b
DL		 3665 if (net != &init_net)
3666 return 0;
3667
1da177e4 3668 read_lock(&dev_base_lock);
7562f876 3669 idx = 0;
881d966b 3670 for_each_netdev(&init_net, dev) {
1da177e4 3671 if (idx < s_idx)
7562f876 3672 goto cont;
1da177e4 3673 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3674 goto cont;
1ab1457c 3675 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3676 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3677 in6_dev_put(idev);
3678 if (err <= 0)
3679 break;
7562f876
PE		 3680cont:
3681 idx++;
1da177e4
LT		 3682 }
3683 read_unlock(&dev_base_lock);
3684 cb->args[0] = idx;
3685
3686 return skb->len;
3687}
3688
3689void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3690{
3691 struct sk_buff *skb;
8d7a76c9 3692 int err = -ENOBUFS;
1ab1457c 3693
339bf98f 3694 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3695 if (skb == NULL)
3696 goto errout;
3697
3698 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3699 if (err < 0) {
3700 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3701 WARN_ON(err == -EMSGSIZE);
3702 kfree_skb(skb);
3703 goto errout;
3704 }
97c53cac 3705 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
8d7a76c9
TG		 3706errout:
3707 if (err < 0)
97c53cac 3708 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3709}
3710
339bf98f
TG		 3711static inline size_t inet6_prefix_nlmsg_size(void)
3712{
3713 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3714 + nla_total_size(sizeof(struct in6_addr))
3715 + nla_total_size(sizeof(struct prefix_cacheinfo));
3716}
c5396a31 3717
1da177e4 3718static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3719 struct prefix_info *pinfo, u32 pid, u32 seq,
3720 int event, unsigned int flags)
1da177e4 3721{
6051e2f4
TG		 3722 struct prefixmsg *pmsg;
3723 struct nlmsghdr *nlh;
1da177e4
LT		 3724 struct prefix_cacheinfo ci;
3725
6051e2f4
TG		 3726 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3727 if (nlh == NULL)
26932566 3728 return -EMSGSIZE;
6051e2f4
TG		 3729
3730 pmsg = nlmsg_data(nlh);
1da177e4 3731 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3732 pmsg->prefix_pad1 = 0;
3733 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3734 pmsg->prefix_ifindex = idev->dev->ifindex;
3735 pmsg->prefix_len = pinfo->prefix_len;
3736 pmsg->prefix_type = pinfo->type;
8a47077a 3737 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3738 pmsg->prefix_flags = 0;
3739 if (pinfo->onlink)
3740 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3741 if (pinfo->autoconf)
3742 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3743
6051e2f4 3744 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3745
3746 ci.preferred_time = ntohl(pinfo->prefered);
3747 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3748 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3749
6051e2f4 3750 return nlmsg_end(skb, nlh);
1da177e4 3751
6051e2f4 3752nla_put_failure:
26932566
PM		 3753 nlmsg_cancel(skb, nlh);
3754 return -EMSGSIZE;
1da177e4
LT		 3755}
3756
1ab1457c 3757static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3758 struct prefix_info *pinfo)
3759{
3760 struct sk_buff *skb;
8c384bfa 3761 int err = -ENOBUFS;
1da177e4 3762
339bf98f 3763 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3764 if (skb == NULL)
3765 goto errout;
3766
3767 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3768 if (err < 0) {
3769 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3770 WARN_ON(err == -EMSGSIZE);
3771 kfree_skb(skb);
3772 goto errout;
3773 }
97c53cac 3774 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
8c384bfa
TG		 3775errout:
3776 if (err < 0)
97c53cac 3777 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3778}
3779
1da177e4
LT		 3780static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3781{
3782 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3783
3784 switch (event) {
3785 case RTM_NEWADDR:
95c385b4
NH		 3786 /*
3787 * If the address was optimistic
3788 * we inserted the route at the start of
3789 * our DAD process, so we don't need
3790 * to do it again
3791 */
3792 if (!(ifp->rt->rt6i_node))
3793 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3794 if (ifp->idev->cnf.forwarding)
3795 addrconf_join_anycast(ifp);
3796 break;
3797 case RTM_DELADDR:
3798 if (ifp->idev->cnf.forwarding)
3799 addrconf_leave_anycast(ifp);
3800 addrconf_leave_solict(ifp->idev, &ifp->addr);
3801 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3802 if (ip6_del_rt(ifp->rt))
1da177e4 3803 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3804 break;
3805 }
3806}
3807
3808static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3809{
8814c4b5 3810 rcu_read_lock_bh();
1da177e4
LT		 3811 if (likely(ifp->idev->dead == 0))
3812 __ipv6_ifa_notify(event, ifp);
8814c4b5 3813 rcu_read_unlock_bh();
1da177e4
LT		 3814}
3815
3816#ifdef CONFIG_SYSCTL
3817
3818static
3819int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3820 void __user *buffer, size_t *lenp, loff_t *ppos)
3821{
3822 int *valp = ctl->data;
3823 int val = *valp;
3824 int ret;
3825
3826 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3827
c8fecf22
PE		 3828 if (write)
3829 addrconf_fixup_forwarding(ctl, valp, val);
1ab1457c 3830 return ret;
1da177e4
LT		 3831}
3832
1ab1457c 3833static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3834 int __user *name, int nlen,
3835 void __user *oldval,
3836 size_t __user *oldlenp,
1f29bcd7 3837 void __user *newval, size_t newlen)
1da177e4
LT		 3838{
3839 int *valp = table->data;
c8fecf22 3840 int val = *valp;
1da177e4
LT		 3841 int new;
3842
3843 if (!newval || !newlen)
3844 return 0;
3845 if (newlen != sizeof(int))
3846 return -EINVAL;
3847 if (get_user(new, (int __user *)newval))
3848 return -EFAULT;
3849 if (new == *valp)
3850 return 0;
3851 if (oldval && oldlenp) {
3852 size_t len;
3853 if (get_user(len, oldlenp))
3854 return -EFAULT;
3855 if (len) {
3856 if (len > table->maxlen)
3857 len = table->maxlen;
3858 if (copy_to_user(oldval, valp, len))
3859 return -EFAULT;
3860 if (put_user(len, oldlenp))
3861 return -EFAULT;
3862 }
3863 }
3864
c8fecf22
PE		 3865 *valp = new;
3866 addrconf_fixup_forwarding(table, valp, val);
1da177e4
LT		 3867 return 1;
3868}
3869
3870static struct addrconf_sysctl_table
3871{
3872 struct ctl_table_header *sysctl_header;
3873 ctl_table addrconf_vars[__NET_IPV6_MAX];
1dab6222 3874 char *dev_name;
ab32ea5d 3875} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3876 .sysctl_header = NULL,
3877 .addrconf_vars = {
1ab1457c 3878 {
1da177e4
LT		 3879 .ctl_name = NET_IPV6_FORWARDING,
3880 .procname = "forwarding",
1ab1457c 3881 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3882 .maxlen = sizeof(int),
3883 .mode = 0644,
1ab1457c 3884 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3885 .strategy = &addrconf_sysctl_forward_strategy,
3886 },
3887 {
3888 .ctl_name = NET_IPV6_HOP_LIMIT,
3889 .procname = "hop_limit",
1ab1457c 3890 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3891 .maxlen = sizeof(int),
3892 .mode = 0644,
3893 .proc_handler = proc_dointvec,
3894 },
3895 {
3896 .ctl_name = NET_IPV6_MTU,
3897 .procname = "mtu",
3898 .data = &ipv6_devconf.mtu6,
1ab1457c 3899 .maxlen = sizeof(int),
1da177e4 3900 .mode = 0644,
1ab1457c 3901 .proc_handler = &proc_dointvec,
1da177e4
LT		 3902 },
3903 {
3904 .ctl_name = NET_IPV6_ACCEPT_RA,
3905 .procname = "accept_ra",
1ab1457c 3906 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3907 .maxlen = sizeof(int),
3908 .mode = 0644,
1ab1457c 3909 .proc_handler = &proc_dointvec,
1da177e4
LT		 3910 },
3911 {
3912 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3913 .procname = "accept_redirects",
1ab1457c 3914 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3915 .maxlen = sizeof(int),
3916 .mode = 0644,
1ab1457c 3917 .proc_handler = &proc_dointvec,
1da177e4
LT		 3918 },
3919 {
3920 .ctl_name = NET_IPV6_AUTOCONF,
3921 .procname = "autoconf",
1ab1457c 3922 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3923 .maxlen = sizeof(int),
3924 .mode = 0644,
1ab1457c 3925 .proc_handler = &proc_dointvec,
1da177e4
LT		 3926 },
3927 {
3928 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3929 .procname = "dad_transmits",
1ab1457c 3930 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3931 .maxlen = sizeof(int),
3932 .mode = 0644,
1ab1457c 3933 .proc_handler = &proc_dointvec,
1da177e4
LT		 3934 },
3935 {
3936 .ctl_name = NET_IPV6_RTR_SOLICITS,
3937 .procname = "router_solicitations",
1ab1457c 3938 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3939 .maxlen = sizeof(int),
3940 .mode = 0644,
1ab1457c 3941 .proc_handler = &proc_dointvec,
1da177e4
LT		 3942 },
3943 {
3944 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3945 .procname = "router_solicitation_interval",
1ab1457c 3946 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3947 .maxlen = sizeof(int),
3948 .mode = 0644,
1ab1457c 3949 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3950 .strategy = &sysctl_jiffies,
3951 },
3952 {
3953 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3954 .procname = "router_solicitation_delay",
1ab1457c 3955 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3956 .maxlen = sizeof(int),
3957 .mode = 0644,
1ab1457c 3958 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3959 .strategy = &sysctl_jiffies,
3960 },
3961 {
3962 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3963 .procname = "force_mld_version",
1ab1457c 3964 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3965 .maxlen = sizeof(int),
3966 .mode = 0644,
1ab1457c 3967 .proc_handler = &proc_dointvec,
1da177e4
LT		 3968 },
3969#ifdef CONFIG_IPV6_PRIVACY
3970 {
3971 .ctl_name = NET_IPV6_USE_TEMPADDR,
3972 .procname = "use_tempaddr",
1ab1457c 3973 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3974 .maxlen = sizeof(int),
3975 .mode = 0644,
1ab1457c 3976 .proc_handler = &proc_dointvec,
1da177e4
LT		 3977 },
3978 {
3979 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3980 .procname = "temp_valid_lft",
1ab1457c 3981 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3982 .maxlen = sizeof(int),
3983 .mode = 0644,
1ab1457c 3984 .proc_handler = &proc_dointvec,
1da177e4
LT		 3985 },
3986 {
3987 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3988 .procname = "temp_prefered_lft",
1ab1457c 3989 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3990 .maxlen = sizeof(int),
3991 .mode = 0644,
1ab1457c 3992 .proc_handler = &proc_dointvec,
1da177e4
LT		 3993 },
3994 {
3995 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3996 .procname = "regen_max_retry",
1ab1457c 3997 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3998 .maxlen = sizeof(int),
3999 .mode = 0644,
1ab1457c 4000 .proc_handler = &proc_dointvec,
1da177e4
LT		 4001 },
4002 {
4003 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4004 .procname = "max_desync_factor",
1ab1457c 4005 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 4006 .maxlen = sizeof(int),
4007 .mode = 0644,
1ab1457c 4008 .proc_handler = &proc_dointvec,
1da177e4
LT		 4009 },
4010#endif
4011 {
4012 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4013 .procname = "max_addresses",
4014 .data = &ipv6_devconf.max_addresses,
4015 .maxlen = sizeof(int),
4016 .mode = 0644,
4017 .proc_handler = &proc_dointvec,
4018 },
65f5c7c1
YH		 4019 {
4020 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4021 .procname = "accept_ra_defrtr",
1ab1457c 4022 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 4023 .maxlen = sizeof(int),
4024 .mode = 0644,
1ab1457c 4025 .proc_handler = &proc_dointvec,
65f5c7c1 4026 },
c4fd30eb
YH		 4027 {
4028 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4029 .procname = "accept_ra_pinfo",
1ab1457c 4030 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 4031 .maxlen = sizeof(int),
4032 .mode = 0644,
1ab1457c 4033 .proc_handler = &proc_dointvec,
c4fd30eb 4034 },
930d6ff2
YH		 4035#ifdef CONFIG_IPV6_ROUTER_PREF
4036 {
4037 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4038 .procname = "accept_ra_rtr_pref",
4039 .data = &ipv6_devconf.accept_ra_rtr_pref,
4040 .maxlen = sizeof(int),
4041 .mode = 0644,
4042 .proc_handler = &proc_dointvec,
4043 },
52e16356
YH		 4044 {
4045 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4046 .procname = "router_probe_interval",
4047 .data = &ipv6_devconf.rtr_probe_interval,
4048 .maxlen = sizeof(int),
4049 .mode = 0644,
4050 .proc_handler = &proc_dointvec_jiffies,
4051 .strategy = &sysctl_jiffies,
4052 },
fa03ef38 4053#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4054 {
4055 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4056 .procname = "accept_ra_rt_info_max_plen",
4057 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4058 .maxlen = sizeof(int),
4059 .mode = 0644,
4060 .proc_handler = &proc_dointvec,
4061 },
4062#endif
930d6ff2 4063#endif
fbea49e1
YH		 4064 {
4065 .ctl_name = NET_IPV6_PROXY_NDP,
4066 .procname = "proxy_ndp",
4067 .data = &ipv6_devconf.proxy_ndp,
4068 .maxlen = sizeof(int),
4069 .mode = 0644,
4070 .proc_handler = &proc_dointvec,
4071 },
0bcbc926
YH		 4072 {
4073 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4074 .procname = "accept_source_route",
4075 .data = &ipv6_devconf.accept_source_route,
4076 .maxlen = sizeof(int),
4077 .mode = 0644,
4078 .proc_handler = &proc_dointvec,
4079 },
95c385b4
NH		 4080#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4081 {
4082 .ctl_name = CTL_UNNUMBERED,
4083 .procname = "optimistic_dad",
4084 .data = &ipv6_devconf.optimistic_dad,
4085 .maxlen = sizeof(int),
4086 .mode = 0644,
4087 .proc_handler = &proc_dointvec,
4088
4089 },
4090#endif
1da177e4
LT		 4091 {
4092 .ctl_name = 0, /* sentinel */
4093 }
4094 },
1da177e4
LT		 4095};
4096
bff16c2f
PE		 4097static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4098 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
1da177e4
LT		 4099{
4100 int i;
1da177e4 4101 struct addrconf_sysctl_table *t;
1da177e4 4102
1dab6222
PE		 4103#define ADDRCONF_CTL_PATH_DEV 3
4104
4105 struct ctl_path addrconf_ctl_path[] = {
4106 { .procname = "net", .ctl_name = CTL_NET, },
4107 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4108 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4109 { /* to be set */ },
4110 { },
4111 };
4112
4113
af879cc7 4114 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4 4115 if (t == NULL)
f68635e6
PE		 4116 goto out;
4117
1da177e4
LT		 4118 for (i=0; t->addrconf_vars[i].data; i++) {
4119 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4 4120 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
bff16c2f 4121 t->addrconf_vars[i].extra2 = net;
1da177e4 4122 }
1da177e4 4123
1ab1457c
YH		 4124 /*
4125 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4126 * by sysctl and we wouldn't want anyone to change it under our feet
4127 * (see SIOCSIFNAME).
1ab1457c 4128 */
1dab6222
PE		 4129 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4130 if (!t->dev_name)
f68635e6 4131 goto free;
1da177e4 4132
1dab6222
PE		 4133 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4134 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
1da177e4 4135
bff16c2f 4136 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
1dab6222 4137 t->addrconf_vars);
1da177e4
LT		 4138 if (t->sysctl_header == NULL)
4139 goto free_procname;
f68635e6
PE		 4140
4141 p->sysctl = t;
95897312 4142 return 0;
1da177e4 4143
f68635e6 4144free_procname:
1dab6222 4145 kfree(t->dev_name);
f68635e6 4146free:
1da177e4 4147 kfree(t);
f68635e6 4148out:
95897312 4149 return -ENOBUFS;
1da177e4
LT		 4150}
4151
408c4768
PE		 4152static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4153{
4154 struct addrconf_sysctl_table *t;
4155
4156 if (p->sysctl == NULL)
4157 return;
4158
4159 t = p->sysctl;
4160 p->sysctl = NULL;
4161 unregister_sysctl_table(t->sysctl_header);
4162 kfree(t->dev_name);
4163 kfree(t);
4164}
4165
f52295a9
PE		 4166static void addrconf_sysctl_register(struct inet6_dev *idev)
4167{
408c4768
PE		 4168 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4169 NET_IPV6_NEIGH, "ipv6",
4170 &ndisc_ifinfo_sysctl_change,
4171 NULL);
bff16c2f
PE		 4172 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4173 idev->dev->ifindex, idev, &idev->cnf);
f52295a9
PE		 4174}
4175
408c4768 4176static void addrconf_sysctl_unregister(struct inet6_dev *idev)
1da177e4 4177{
408c4768
PE		 4178 __addrconf_sysctl_unregister(&idev->cnf);
4179 neigh_sysctl_unregister(idev->nd_parms);
1da177e4
LT		 4180}
4181
4182
4183#endif
4184
e0da5a48
PE		 4185static int addrconf_init_net(struct net *net)
4186{
4187 int err;
4188 struct ipv6_devconf *all, *dflt;
4189
4190 err = -ENOMEM;
4191 all = &ipv6_devconf;
4192 dflt = &ipv6_devconf_dflt;
4193
4194 if (net != &init_net) {
4195 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4196 if (all == NULL)
4197 goto err_alloc_all;
4198
4199 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4200 if (dflt == NULL)
4201 goto err_alloc_dflt;
4202 }
4203
4204 net->ipv6.devconf_all = all;
4205 net->ipv6.devconf_dflt = dflt;
4206
4207#ifdef CONFIG_SYSCTL
4208 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4209 NULL, all);
4210 if (err < 0)
4211 goto err_reg_all;
4212
4213 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4214 NULL, dflt);
4215 if (err < 0)
4216 goto err_reg_dflt;
4217#endif
4218 return 0;
4219
4220#ifdef CONFIG_SYSCTL
4221err_reg_dflt:
4222 __addrconf_sysctl_unregister(all);
4223err_reg_all:
4224 kfree(dflt);
4225#endif
4226err_alloc_dflt:
4227 kfree(all);
4228err_alloc_all:
4229 return err;
4230}
4231
4232static void addrconf_exit_net(struct net *net)
4233{
4234#ifdef CONFIG_SYSCTL
4235 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4236 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4237#endif
4238 if (net != &init_net) {
4239 kfree(net->ipv6.devconf_dflt);
4240 kfree(net->ipv6.devconf_all);
4241 }
4242}
4243
4244static struct pernet_operations addrconf_ops = {
4245 .init = addrconf_init_net,
4246 .exit = addrconf_exit_net,
4247};
4248
1da177e4
LT		 4249/*
4250 * Device notifier
4251 */
4252
4253int register_inet6addr_notifier(struct notifier_block *nb)
4254{
1ab1457c 4255 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4256}
4257
7159039a
YH		 4258EXPORT_SYMBOL(register_inet6addr_notifier);
4259
1da177e4
LT		 4260int unregister_inet6addr_notifier(struct notifier_block *nb)
4261{
1ab1457c 4262 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4263}
4264
7159039a
YH		 4265EXPORT_SYMBOL(unregister_inet6addr_notifier);
4266
1da177e4
LT		 4267/*
4268 * Init / cleanup code
4269 */
4270
4271int __init addrconf_init(void)
4272{
2a8cc6c8
YH		 4273 int err;
4274
4275 if ((err = ipv6_addr_label_init()) < 0) {
4276 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4277 err);
4278 return err;
4279 }
1da177e4 4280
e0da5a48
PE		 4281 register_pernet_subsys(&addrconf_ops);
4282
1da177e4
LT		 4283 /* The addrconf netdev notifier requires that loopback_dev
4284 * has it's ipv6 private information allocated and setup
4285 * before it can bring up and give link-local addresses
4286 * to other devices which are up.
4287 *
4288 * Unfortunately, loopback_dev is not necessarily the first
4289 * entry in the global dev_base list of net devices. In fact,
4290 * it is likely to be the very last entry on that list.
4291 * So this causes the notifier registry below to try and
4292 * give link-local addresses to all devices besides loopback_dev
4293 * first, then loopback_dev, which cases all the non-loopback_dev
4294 * devices to fail to get a link-local address.
4295 *
4296 * So, as a temporary fix, allocate the ipv6 structure for
4297 * loopback_dev first by hand.
4298 * Longer term, all of the dependencies ipv6 has upon the loopback
4299 * device and it being up should be removed.
4300 */
4301 rtnl_lock();
2774c7ab 4302 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4303 err = -ENOMEM;
4304 rtnl_unlock();
4305 if (err)
e0da5a48 4306 goto errlo;
1da177e4 4307
2774c7ab
EB		 4308 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4309 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4310#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4311 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4312 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4313 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4314 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4315#endif
c62dba90 4316
1da177e4
LT		 4317 register_netdevice_notifier(&ipv6_dev_notf);
4318
1da177e4 4319 addrconf_verify(0);
c127ea2c
TG		 4320
4321 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4322 if (err < 0)
4323 goto errout;
4324
4325 /* Only the first call to __rtnl_register can fail */
4326 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4327 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4328 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4329 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4330 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4331
2a8cc6c8
YH		 4332 ipv6_addr_label_rtnl_register();
4333
1da177e4 4334 return 0;
c127ea2c
TG		 4335errout:
4336 unregister_netdevice_notifier(&ipv6_dev_notf);
e0da5a48
PE		 4337errlo:
4338 unregister_pernet_subsys(&addrconf_ops);
c127ea2c
TG		 4339
4340 return err;
1da177e4
LT		 4341}
4342
09f7709f 4343void addrconf_cleanup(void)
1da177e4 4344{
1ab1457c 4345 struct net_device *dev;
1ab1457c 4346 struct inet6_ifaddr *ifa;
1da177e4
LT		 4347 int i;
4348
4349 unregister_netdevice_notifier(&ipv6_dev_notf);
4350
e0da5a48 4351 unregister_pernet_subsys(&addrconf_ops);
1da177e4
LT		 4352
4353 rtnl_lock();
4354
4355 /*
4356 * clean dev list.
4357 */
4358
881d966b 4359 for_each_netdev(&init_net, dev) {
dffe4f04 4360 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4361 continue;
4362 addrconf_ifdown(dev, 1);
4363 }
2774c7ab 4364 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4365
4366 /*
4367 * Check hash table.
4368 */
4369
4370 write_lock_bh(&addrconf_hash_lock);
4371 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4372 for (ifa=inet6_addr_lst[i]; ifa; ) {
4373 struct inet6_ifaddr *bifa;
4374
4375 bifa = ifa;
4376 ifa = ifa->lst_next;
4377 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4378 /* Do not free it; something is wrong.
4379 Now we can investigate it with debugger.
4380 */
4381 }
4382 }
4383 write_unlock_bh(&addrconf_hash_lock);
4384
4385 del_timer(&addr_chk_timer);
4386
4387 rtnl_unlock();
1da177e4 4388}
Linux kernel - Deliverables
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