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[IPV4]: Consolidate common SNMP code
[net-next-2.6.git] / net / ipv6 / addrconf.c
CommitLineData
1da177e4
LT		 1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
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
LT		 64
65#include <net/sock.h>
66#include <net/snmp.h>
67
68#include <net/ipv6.h>
69#include <net/protocol.h>
70#include <net/ndisc.h>
71#include <net/ip6_route.h>
72#include <net/addrconf.h>
73#include <net/tcp.h>
74#include <net/ip.h>
5d620266 75#include <net/netlink.h>
1da177e4
LT		 76#include <linux/if_tunnel.h>
77#include <linux/rtnetlink.h>
78
79#ifdef CONFIG_IPV6_PRIVACY
80#include <linux/random.h>
1da177e4
LT		 81#endif
82
83#include <asm/uaccess.h>
84
85#include <linux/proc_fs.h>
86#include <linux/seq_file.h>
87
88/* Set to 3 to get tracing... */
89#define ACONF_DEBUG 2
90
91#if ACONF_DEBUG >= 3
92#define ADBG(x) printk x
93#else
94#define ADBG(x)
95#endif
96
97#define INFINITY_LIFE_TIME 0xFFFFFFFF
98#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
99
100#ifdef CONFIG_SYSCTL
101static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
102static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
103#endif
104
105#ifdef CONFIG_IPV6_PRIVACY
106static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 107static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 108static void ipv6_regen_rndid(unsigned long data);
109
110static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 111#endif
112
113static int ipv6_count_addresses(struct inet6_dev *idev);
114
115/*
116 * Configured unicast address hash table
117 */
118static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
119static DEFINE_RWLOCK(addrconf_hash_lock);
120
1da177e4
LT		 121static void addrconf_verify(unsigned long);
122
8d06afab 123static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 124static DEFINE_SPINLOCK(addrconf_verify_lock);
125
126static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
127static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
128
129static int addrconf_ifdown(struct net_device *dev, int how);
130
e431b8c0 131static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 132static void addrconf_dad_timer(unsigned long data);
133static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 134static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 135static void addrconf_rs_timer(unsigned long data);
136static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
137static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
138
1ab1457c 139static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 140 struct prefix_info *pinfo);
141static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
142
e041c683 143static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 144
ab32ea5d 145struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 146 .forwarding = 0,
147 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
148 .mtu6 = IPV6_MIN_MTU,
149 .accept_ra = 1,
150 .accept_redirects = 1,
151 .autoconf = 1,
152 .force_mld_version = 0,
153 .dad_transmits = 1,
154 .rtr_solicits = MAX_RTR_SOLICITATIONS,
155 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
156 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
157#ifdef CONFIG_IPV6_PRIVACY
158 .use_tempaddr = 0,
159 .temp_valid_lft = TEMP_VALID_LIFETIME,
160 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
161 .regen_max_retry = REGEN_MAX_RETRY,
162 .max_desync_factor = MAX_DESYNC_FACTOR,
163#endif
164 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 165 .accept_ra_defrtr = 1,
c4fd30eb 166 .accept_ra_pinfo = 1,
930d6ff2
YH		 167#ifdef CONFIG_IPV6_ROUTER_PREF
168 .accept_ra_rtr_pref = 1,
52e16356 169 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 170#ifdef CONFIG_IPV6_ROUTE_INFO
171 .accept_ra_rt_info_max_plen = 0,
172#endif
930d6ff2 173#endif
fbea49e1 174 .proxy_ndp = 0,
0bcbc926 175 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 176};
177
ab32ea5d 178static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 179 .forwarding = 0,
180 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
181 .mtu6 = IPV6_MIN_MTU,
182 .accept_ra = 1,
183 .accept_redirects = 1,
184 .autoconf = 1,
185 .dad_transmits = 1,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189#ifdef CONFIG_IPV6_PRIVACY
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195#endif
196 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 197 .accept_ra_defrtr = 1,
c4fd30eb 198 .accept_ra_pinfo = 1,
930d6ff2
YH		 199#ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
52e16356 201 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 202#ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204#endif
930d6ff2 205#endif
fbea49e1 206 .proxy_ndp = 0,
0bcbc926 207 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 208};
209
210/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
211#if 0
212const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
213#endif
214const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
215
1da177e4
LT		 216static void addrconf_del_timer(struct inet6_ifaddr *ifp)
217{
218 if (del_timer(&ifp->timer))
219 __in6_ifa_put(ifp);
220}
221
222enum addrconf_timer_t
223{
224 AC_NONE,
225 AC_DAD,
226 AC_RS,
227};
228
229static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
230 enum addrconf_timer_t what,
231 unsigned long when)
232{
233 if (!del_timer(&ifp->timer))
234 in6_ifa_hold(ifp);
235
236 switch (what) {
237 case AC_DAD:
238 ifp->timer.function = addrconf_dad_timer;
239 break;
240 case AC_RS:
241 ifp->timer.function = addrconf_rs_timer;
242 break;
243 default:;
244 }
245 ifp->timer.expires = jiffies + when;
246 add_timer(&ifp->timer);
247}
248
249/* Nobody refers to this device, we may destroy it. */
250
8814c4b5
YH		 251static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
252{
253 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
254 kfree(idev);
255}
256
1da177e4
LT		 257void in6_dev_finish_destroy(struct inet6_dev *idev)
258{
259 struct net_device *dev = idev->dev;
260 BUG_TRAP(idev->addr_list==NULL);
261 BUG_TRAP(idev->mc_list==NULL);
262#ifdef NET_REFCNT_DEBUG
263 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
264#endif
265 dev_put(dev);
266 if (!idev->dead) {
267 printk("Freeing alive inet6 device %p\n", idev);
268 return;
269 }
270 snmp6_free_dev(idev);
8814c4b5 271 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 272}
273
7159039a
YH		 274EXPORT_SYMBOL(in6_dev_finish_destroy);
275
1da177e4
LT		 276static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
277{
278 struct inet6_dev *ndev;
d88ae4cc 279 struct in6_addr maddr;
1da177e4
LT		 280
281 ASSERT_RTNL();
282
283 if (dev->mtu < IPV6_MIN_MTU)
284 return NULL;
285
1ab1457c 286 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 287
1ab1457c
YH		 288 if (ndev == NULL)
289 return NULL;
322f74a4
IO		 290
291 rwlock_init(&ndev->lock);
292 ndev->dev = dev;
293 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
294 ndev->cnf.mtu6 = dev->mtu;
295 ndev->cnf.sysctl = NULL;
296 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
297 if (ndev->nd_parms == NULL) {
298 kfree(ndev);
299 return NULL;
300 }
301 /* We refer to the device */
302 dev_hold(dev);
1da177e4 303
322f74a4
IO		 304 if (snmp6_alloc_dev(ndev) < 0) {
305 ADBG((KERN_WARNING
306 "%s(): cannot allocate memory for statistics; dev=%s.\n",
307 __FUNCTION__, dev->name));
308 neigh_parms_release(&nd_tbl, ndev->nd_parms);
309 ndev->dead = 1;
310 in6_dev_finish_destroy(ndev);
311 return NULL;
312 }
1da177e4 313
322f74a4
IO		 314 if (snmp6_register_dev(ndev) < 0) {
315 ADBG((KERN_WARNING
316 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
317 __FUNCTION__, dev->name));
318 neigh_parms_release(&nd_tbl, ndev->nd_parms);
319 ndev->dead = 1;
320 in6_dev_finish_destroy(ndev);
321 return NULL;
322 }
323
324 /* One reference from device. We must do this before
325 * we invoke __ipv6_regen_rndid().
326 */
327 in6_dev_hold(ndev);
1da177e4
LT		 328
329#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 330 init_timer(&ndev->regen_timer);
331 ndev->regen_timer.function = ipv6_regen_rndid;
332 ndev->regen_timer.data = (unsigned long) ndev;
333 if ((dev->flags&IFF_LOOPBACK) ||
334 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 335#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
336 dev->type == ARPHRD_SIT ||
337#endif
338 dev->type == ARPHRD_NONE) {
322f74a4
IO		 339 printk(KERN_INFO
340 "%s: Disabled Privacy Extensions\n",
341 dev->name);
342 ndev->cnf.use_tempaddr = -1;
343 } else {
344 in6_dev_hold(ndev);
345 ipv6_regen_rndid((unsigned long) ndev);
346 }
1da177e4
LT		 347#endif
348
53aadcc9
HX		 349 if (netif_running(dev) && netif_carrier_ok(dev))
350 ndev->if_flags |= IF_READY;
351
322f74a4
IO		 352 ipv6_mc_init_dev(ndev);
353 ndev->tstamp = jiffies;
1da177e4 354#ifdef CONFIG_SYSCTL
322f74a4
IO		 355 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
356 NET_IPV6_NEIGH, "ipv6",
357 &ndisc_ifinfo_sysctl_change,
358 NULL);
359 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 360#endif
30c4cf57
DS		 361 /* protected by rtnl_lock */
362 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 363
364 /* Join all-node multicast group */
365 ipv6_addr_all_nodes(&maddr);
366 ipv6_dev_mc_inc(dev, &maddr);
367
1da177e4
LT		 368 return ndev;
369}
370
371static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
372{
373 struct inet6_dev *idev;
374
375 ASSERT_RTNL();
376
377 if ((idev = __in6_dev_get(dev)) == NULL) {
378 if ((idev = ipv6_add_dev(dev)) == NULL)
379 return NULL;
380 }
c5e33bdd 381
1da177e4
LT		 382 if (dev->flags&IFF_UP)
383 ipv6_mc_up(idev);
384 return idev;
385}
386
387#ifdef CONFIG_SYSCTL
388static void dev_forward_change(struct inet6_dev *idev)
389{
390 struct net_device *dev;
391 struct inet6_ifaddr *ifa;
392 struct in6_addr addr;
393
394 if (!idev)
395 return;
396 dev = idev->dev;
397 if (dev && (dev->flags & IFF_MULTICAST)) {
398 ipv6_addr_all_routers(&addr);
1ab1457c 399
1da177e4
LT		 400 if (idev->cnf.forwarding)
401 ipv6_dev_mc_inc(dev, &addr);
402 else
403 ipv6_dev_mc_dec(dev, &addr);
404 }
405 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 406 if (ifa->flags&IFA_F_TENTATIVE)
407 continue;
1da177e4
LT		 408 if (idev->cnf.forwarding)
409 addrconf_join_anycast(ifa);
410 else
411 addrconf_leave_anycast(ifa);
412 }
413}
414
415
416static void addrconf_forward_change(void)
417{
418 struct net_device *dev;
419 struct inet6_dev *idev;
420
421 read_lock(&dev_base_lock);
422 for (dev=dev_base; dev; dev=dev->next) {
8814c4b5 423 rcu_read_lock();
1da177e4
LT		 424 idev = __in6_dev_get(dev);
425 if (idev) {
426 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
427 idev->cnf.forwarding = ipv6_devconf.forwarding;
428 if (changed)
429 dev_forward_change(idev);
430 }
8814c4b5 431 rcu_read_unlock();
1da177e4
LT		 432 }
433 read_unlock(&dev_base_lock);
434}
435#endif
436
437/* Nobody refers to this ifaddr, destroy it */
438
439void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
440{
441 BUG_TRAP(ifp->if_next==NULL);
442 BUG_TRAP(ifp->lst_next==NULL);
443#ifdef NET_REFCNT_DEBUG
444 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
445#endif
446
447 in6_dev_put(ifp->idev);
448
449 if (del_timer(&ifp->timer))
450 printk("Timer is still running, when freeing ifa=%p\n", ifp);
451
452 if (!ifp->dead) {
453 printk("Freeing alive inet6 address %p\n", ifp);
454 return;
455 }
456 dst_release(&ifp->rt->u.dst);
457
458 kfree(ifp);
459}
460
e55ffac6
BH		 461static void
462ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
463{
464 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 465 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 466
467 /*
468 * Each device address list is sorted in order of scope -
469 * global before linklocal.
470 */
471 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
472 ifap = &ifa->if_next) {
8a6ce0c0 473 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 474 break;
475 }
476
477 ifp->if_next = *ifap;
478 *ifap = ifp;
479}
480
1da177e4
LT		 481/* On success it returns ifp with increased reference count */
482
483static struct inet6_ifaddr *
484ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 485 int scope, u32 flags)
1da177e4
LT		 486{
487 struct inet6_ifaddr *ifa = NULL;
488 struct rt6_info *rt;
489 int hash;
490 int err = 0;
491
8814c4b5 492 rcu_read_lock_bh();
1da177e4
LT		 493 if (idev->dead) {
494 err = -ENODEV; /*XXX*/
495 goto out2;
496 }
497
498 write_lock(&addrconf_hash_lock);
499
500 /* Ignore adding duplicate addresses on an interface */
501 if (ipv6_chk_same_addr(addr, idev->dev)) {
502 ADBG(("ipv6_add_addr: already assigned\n"));
503 err = -EEXIST;
504 goto out;
505 }
506
322f74a4 507 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 508
509 if (ifa == NULL) {
510 ADBG(("ipv6_add_addr: malloc failed\n"));
511 err = -ENOBUFS;
512 goto out;
513 }
514
515 rt = addrconf_dst_alloc(idev, addr, 0);
516 if (IS_ERR(rt)) {
517 err = PTR_ERR(rt);
518 goto out;
519 }
520
1da177e4
LT		 521 ipv6_addr_copy(&ifa->addr, addr);
522
523 spin_lock_init(&ifa->lock);
524 init_timer(&ifa->timer);
525 ifa->timer.data = (unsigned long) ifa;
526 ifa->scope = scope;
527 ifa->prefix_len = pfxlen;
528 ifa->flags = flags | IFA_F_TENTATIVE;
529 ifa->cstamp = ifa->tstamp = jiffies;
530
57f5f544
KF		 531 ifa->rt = rt;
532
95c385b4
NH		 533 /*
534 * part one of RFC 4429, section 3.3
535 * We should not configure an address as
536 * optimistic if we do not yet know the link
537 * layer address of our nexhop router
538 */
539
540 if (rt->rt6i_nexthop == NULL)
541 ifa->flags &= ~IFA_F_OPTIMISTIC;
542
1da177e4
LT		 543 ifa->idev = idev;
544 in6_dev_hold(idev);
545 /* For caller */
546 in6_ifa_hold(ifa);
547
548 /* Add to big hash table */
549 hash = ipv6_addr_hash(addr);
550
551 ifa->lst_next = inet6_addr_lst[hash];
552 inet6_addr_lst[hash] = ifa;
553 in6_ifa_hold(ifa);
554 write_unlock(&addrconf_hash_lock);
555
556 write_lock(&idev->lock);
557 /* Add to inet6_dev unicast addr list. */
e55ffac6 558 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 559
560#ifdef CONFIG_IPV6_PRIVACY
561 if (ifa->flags&IFA_F_TEMPORARY) {
562 ifa->tmp_next = idev->tempaddr_list;
563 idev->tempaddr_list = ifa;
564 in6_ifa_hold(ifa);
565 }
566#endif
567
1da177e4
LT		 568 in6_ifa_hold(ifa);
569 write_unlock(&idev->lock);
570out2:
8814c4b5 571 rcu_read_unlock_bh();
1da177e4 572
fd92833a 573 if (likely(err == 0))
e041c683 574 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 575 else {
576 kfree(ifa);
577 ifa = ERR_PTR(err);
578 }
579
580 return ifa;
581out:
582 write_unlock(&addrconf_hash_lock);
583 goto out2;
584}
585
586/* This function wants to get referenced ifp and releases it before return */
587
588static void ipv6_del_addr(struct inet6_ifaddr *ifp)
589{
590 struct inet6_ifaddr *ifa, **ifap;
591 struct inet6_dev *idev = ifp->idev;
592 int hash;
593 int deleted = 0, onlink = 0;
594 unsigned long expires = jiffies;
595
596 hash = ipv6_addr_hash(&ifp->addr);
597
598 ifp->dead = 1;
599
600 write_lock_bh(&addrconf_hash_lock);
601 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
602 ifap = &ifa->lst_next) {
603 if (ifa == ifp) {
604 *ifap = ifa->lst_next;
605 __in6_ifa_put(ifp);
606 ifa->lst_next = NULL;
607 break;
608 }
609 }
610 write_unlock_bh(&addrconf_hash_lock);
611
612 write_lock_bh(&idev->lock);
613#ifdef CONFIG_IPV6_PRIVACY
614 if (ifp->flags&IFA_F_TEMPORARY) {
615 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
616 ifap = &ifa->tmp_next) {
617 if (ifa == ifp) {
618 *ifap = ifa->tmp_next;
619 if (ifp->ifpub) {
620 in6_ifa_put(ifp->ifpub);
621 ifp->ifpub = NULL;
622 }
623 __in6_ifa_put(ifp);
624 ifa->tmp_next = NULL;
625 break;
626 }
627 }
628 }
629#endif
630
1d142804 631 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 632 if (ifa == ifp) {
633 *ifap = ifa->if_next;
634 __in6_ifa_put(ifp);
635 ifa->if_next = NULL;
636 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
637 break;
638 deleted = 1;
1d142804 639 continue;
1da177e4
LT		 640 } else if (ifp->flags & IFA_F_PERMANENT) {
641 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
642 ifp->prefix_len)) {
643 if (ifa->flags & IFA_F_PERMANENT) {
644 onlink = 1;
645 if (deleted)
646 break;
647 } else {
648 unsigned long lifetime;
649
650 if (!onlink)
651 onlink = -1;
652
653 spin_lock(&ifa->lock);
654 lifetime = min_t(unsigned long,
655 ifa->valid_lft, 0x7fffffffUL/HZ);
656 if (time_before(expires,
657 ifa->tstamp + lifetime * HZ))
658 expires = ifa->tstamp + lifetime * HZ;
659 spin_unlock(&ifa->lock);
660 }
661 }
662 }
1d142804 663 ifap = &ifa->if_next;
1da177e4
LT		 664 }
665 write_unlock_bh(&idev->lock);
666
667 ipv6_ifa_notify(RTM_DELADDR, ifp);
668
e041c683 669 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 670
671 addrconf_del_timer(ifp);
672
673 /*
674 * Purge or update corresponding prefix
675 *
676 * 1) we don't purge prefix here if address was not permanent.
677 * prefix is managed by its own lifetime.
678 * 2) if there're no addresses, delete prefix.
679 * 3) if there're still other permanent address(es),
680 * corresponding prefix is still permanent.
681 * 4) otherwise, update prefix lifetime to the
682 * longest valid lifetime among the corresponding
683 * addresses on the device.
684 * Note: subsequent RA will update lifetime.
685 *
686 * --yoshfuji
687 */
688 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
689 struct in6_addr prefix;
690 struct rt6_info *rt;
691
692 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
693 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
694
695 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
696 if (onlink == 0) {
e0a1ad73 697 ip6_del_rt(rt);
1da177e4
LT		 698 rt = NULL;
699 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
700 rt->rt6i_expires = expires;
701 rt->rt6i_flags |= RTF_EXPIRES;
702 }
703 }
704 dst_release(&rt->u.dst);
705 }
706
707 in6_ifa_put(ifp);
708}
709
710#ifdef CONFIG_IPV6_PRIVACY
711static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
712{
713 struct inet6_dev *idev = ifp->idev;
714 struct in6_addr addr, *tmpaddr;
715 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
716 int tmp_plen;
717 int ret = 0;
718 int max_addresses;
95c385b4 719 u32 addr_flags;
1da177e4
LT		 720
721 write_lock(&idev->lock);
722 if (ift) {
723 spin_lock_bh(&ift->lock);
724 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
725 spin_unlock_bh(&ift->lock);
726 tmpaddr = &addr;
727 } else {
728 tmpaddr = NULL;
729 }
730retry:
731 in6_dev_hold(idev);
732 if (idev->cnf.use_tempaddr <= 0) {
733 write_unlock(&idev->lock);
734 printk(KERN_INFO
735 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
736 in6_dev_put(idev);
737 ret = -1;
738 goto out;
739 }
740 spin_lock_bh(&ifp->lock);
741 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
742 idev->cnf.use_tempaddr = -1; /*XXX*/
743 spin_unlock_bh(&ifp->lock);
744 write_unlock(&idev->lock);
745 printk(KERN_WARNING
746 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
747 in6_dev_put(idev);
748 ret = -1;
749 goto out;
750 }
751 in6_ifa_hold(ifp);
752 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
753 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
754 spin_unlock_bh(&ifp->lock);
755 write_unlock(&idev->lock);
756 printk(KERN_WARNING
757 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
758 in6_ifa_put(ifp);
759 in6_dev_put(idev);
760 ret = -1;
761 goto out;
762 }
763 memcpy(&addr.s6_addr[8], idev->rndid, 8);
764 tmp_valid_lft = min_t(__u32,
765 ifp->valid_lft,
766 idev->cnf.temp_valid_lft);
1ab1457c
YH		 767 tmp_prefered_lft = min_t(__u32,
768 ifp->prefered_lft,
1da177e4
LT		 769 idev->cnf.temp_prefered_lft - desync_factor / HZ);
770 tmp_plen = ifp->prefix_len;
771 max_addresses = idev->cnf.max_addresses;
772 tmp_cstamp = ifp->cstamp;
773 tmp_tstamp = ifp->tstamp;
774 spin_unlock_bh(&ifp->lock);
775
776 write_unlock(&idev->lock);
95c385b4
NH		 777
778 addr_flags = IFA_F_TEMPORARY;
779 /* set in addrconf_prefix_rcv() */
780 if (ifp->flags & IFA_F_OPTIMISTIC)
781 addr_flags |= IFA_F_OPTIMISTIC;
782
1da177e4 783 ift = !max_addresses ||
1ab1457c 784 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 785 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 786 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
787 addr_flags) : NULL;
1da177e4
LT		 788 if (!ift || IS_ERR(ift)) {
789 in6_ifa_put(ifp);
790 in6_dev_put(idev);
791 printk(KERN_INFO
792 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
793 tmpaddr = &addr;
794 write_lock(&idev->lock);
795 goto retry;
796 }
797
798 spin_lock_bh(&ift->lock);
799 ift->ifpub = ifp;
800 ift->valid_lft = tmp_valid_lft;
801 ift->prefered_lft = tmp_prefered_lft;
802 ift->cstamp = tmp_cstamp;
803 ift->tstamp = tmp_tstamp;
804 spin_unlock_bh(&ift->lock);
805
806 addrconf_dad_start(ift, 0);
807 in6_ifa_put(ift);
808 in6_dev_put(idev);
809out:
810 return ret;
811}
812#endif
813
814/*
072047e4 815 * Choose an appropriate source address (RFC3484)
1da177e4 816 */
072047e4
YH		 817struct ipv6_saddr_score {
818 int addr_type;
819 unsigned int attrs;
820 int matchlen;
0d27b427 821 int scope;
072047e4
YH		 822 unsigned int rule;
823};
824
825#define IPV6_SADDR_SCORE_LOCAL 0x0001
826#define IPV6_SADDR_SCORE_PREFERRED 0x0004
827#define IPV6_SADDR_SCORE_HOA 0x0008
828#define IPV6_SADDR_SCORE_OIF 0x0010
829#define IPV6_SADDR_SCORE_LABEL 0x0020
830#define IPV6_SADDR_SCORE_PRIVACY 0x0040
831
b6f99a21 832static inline int ipv6_saddr_preferred(int type)
1da177e4 833{
072047e4
YH		 834 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
835 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
836 return 1;
837 return 0;
1da177e4
LT		 838}
839
072047e4 840/* static matching label */
b6f99a21 841static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 842{
843 /*
844 * prefix (longest match) label
845 * -----------------------------
846 * ::1/128 0
847 * ::/0 1
848 * 2002::/16 2
849 * ::/96 3
850 * ::ffff:0:0/96 4
102128e3
ŁS		 851 * fc00::/7 5
852 * 2001::/32 6
072047e4
YH		 853 */
854 if (type & IPV6_ADDR_LOOPBACK)
855 return 0;
856 else if (type & IPV6_ADDR_COMPATv4)
857 return 3;
858 else if (type & IPV6_ADDR_MAPPED)
859 return 4;
102128e3
ŁS		 860 else if (addr->s6_addr32[0] == htonl(0x20010000))
861 return 6;
072047e4
YH		 862 else if (addr->s6_addr16[0] == htons(0x2002))
863 return 2;
102128e3
ŁS		 864 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
865 return 5;
072047e4
YH		 866 return 1;
867}
1da177e4 868
072047e4 869int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 870 struct in6_addr *daddr, struct in6_addr *saddr)
871{
072047e4
YH		 872 struct ipv6_saddr_score hiscore;
873 struct inet6_ifaddr *ifa_result = NULL;
874 int daddr_type = __ipv6_addr_type(daddr);
875 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
876 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
877 struct net_device *dev;
1da177e4 878
072047e4 879 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 880
072047e4 881 read_lock(&dev_base_lock);
8814c4b5 882 rcu_read_lock();
1da177e4 883
072047e4
YH		 884 for (dev = dev_base; dev; dev=dev->next) {
885 struct inet6_dev *idev;
886 struct inet6_ifaddr *ifa;
887
888 /* Rule 0: Candidate Source Address (section 4)
889 * - multicast and link-local destination address,
890 * the set of candidate source address MUST only
891 * include addresses assigned to interfaces
892 * belonging to the same link as the outgoing
893 * interface.
894 * (- For site-local destination addresses, the
895 * set of candidate source addresses MUST only
896 * include addresses assigned to interfaces
897 * belonging to the same site as the outgoing
898 * interface.)
899 */
900 if ((daddr_type & IPV6_ADDR_MULTICAST ||
901 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
902 daddr_dev && dev != daddr_dev)
903 continue;
1da177e4 904
1da177e4 905 idev = __in6_dev_get(dev);
072047e4
YH		 906 if (!idev)
907 continue;
908
909 read_lock_bh(&idev->lock);
910 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
911 struct ipv6_saddr_score score;
912
913 score.addr_type = __ipv6_addr_type(&ifa->addr);
914
6b3ae80a
YH		 915 /* Rule 0:
916 * - Tentative Address (RFC2462 section 5.4)
917 * - A tentative address is not considered
918 * "assigned to an interface" in the traditional
95c385b4 919 * sense, unless it is also flagged as optimistic.
6b3ae80a 920 * - Candidate Source Address (section 4)
072047e4
YH		 921 * - In any case, anycast addresses, multicast
922 * addresses, and the unspecified address MUST
923 * NOT be included in a candidate set.
924 */
95c385b4
NH		 925 if ((ifa->flags & IFA_F_TENTATIVE) &&
926 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 927 continue;
072047e4
YH		 928 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
929 score.addr_type & IPV6_ADDR_MULTICAST)) {
930 LIMIT_NETDEBUG(KERN_DEBUG
931 "ADDRCONF: unspecified / multicast address"
932 "assigned as unicast address on %s",
933 dev->name);
934 continue;
935 }
936
937 score.attrs = 0;
938 score.matchlen = 0;
939 score.scope = 0;
940 score.rule = 0;
941
942 if (ifa_result == NULL) {
943 /* record it if the first available entry */
944 goto record_it;
945 }
946
947 /* Rule 1: Prefer same address */
948 if (hiscore.rule < 1) {
949 if (ipv6_addr_equal(&ifa_result->addr, daddr))
950 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
951 hiscore.rule++;
952 }
953 if (ipv6_addr_equal(&ifa->addr, daddr)) {
954 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
955 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
956 score.rule = 1;
957 goto record_it;
1da177e4 958 }
072047e4
YH		 959 } else {
960 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
961 continue;
1da177e4 962 }
1da177e4 963
072047e4
YH		 964 /* Rule 2: Prefer appropriate scope */
965 if (hiscore.rule < 2) {
966 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
967 hiscore.rule++;
968 }
969 score.scope = __ipv6_addr_src_scope(score.addr_type);
970 if (hiscore.scope < score.scope) {
971 if (hiscore.scope < daddr_scope) {
972 score.rule = 2;
973 goto record_it;
974 } else
975 continue;
976 } else if (score.scope < hiscore.scope) {
977 if (score.scope < daddr_scope)
e55ffac6 978 break; /* addresses sorted by scope */
072047e4
YH		 979 else {
980 score.rule = 2;
981 goto record_it;
982 }
983 }
1da177e4 984
95c385b4 985 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 986 if (hiscore.rule < 3) {
987 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 988 (((ifa_result->flags &
989 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 990 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
991 hiscore.rule++;
992 }
993 if (ipv6_saddr_preferred(score.addr_type) ||
95c385b4
NH		 994 (((ifa_result->flags &
995 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 996 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
997 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
998 score.rule = 3;
999 goto record_it;
1000 }
1001 } else {
1002 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1003 continue;
1004 }
1da177e4 1005
3b9f9a1c
NT		 1006 /* Rule 4: Prefer home address */
1007#ifdef CONFIG_IPV6_MIP6
1008 if (hiscore.rule < 4) {
1009 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1010 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1011 hiscore.rule++;
1012 }
1013 if (ifa->flags & IFA_F_HOMEADDRESS) {
1014 score.attrs |= IPV6_SADDR_SCORE_HOA;
1015 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1016 score.rule = 4;
1017 goto record_it;
1018 }
1019 } else {
1020 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1021 continue;
1022 }
1023#else
220bbd74
YH		 1024 if (hiscore.rule < 4)
1025 hiscore.rule++;
3b9f9a1c 1026#endif
072047e4
YH		 1027
1028 /* Rule 5: Prefer outgoing interface */
1029 if (hiscore.rule < 5) {
1030 if (daddr_dev == NULL ||
1031 daddr_dev == ifa_result->idev->dev)
1032 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1033 hiscore.rule++;
1034 }
1035 if (daddr_dev == NULL ||
1036 daddr_dev == ifa->idev->dev) {
1037 score.attrs |= IPV6_SADDR_SCORE_OIF;
1038 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1039 score.rule = 5;
1040 goto record_it;
1041 }
1042 } else {
1043 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1044 continue;
1045 }
1046
1047 /* Rule 6: Prefer matching label */
1048 if (hiscore.rule < 6) {
1049 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1050 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1051 hiscore.rule++;
1052 }
1053 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1054 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1055 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1056 score.rule = 6;
1057 goto record_it;
1da177e4 1058 }
072047e4
YH		 1059 } else {
1060 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1061 continue;
1062 }
1063
44fd0261 1064#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1065 /* Rule 7: Prefer public address
1066 * Note: prefer temprary address if use_tempaddr >= 2
1067 */
1068 if (hiscore.rule < 7) {
1069 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1070 (ifa_result->idev->cnf.use_tempaddr >= 2))
1071 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1072 hiscore.rule++;
1073 }
1074 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1075 (ifa->idev->cnf.use_tempaddr >= 2)) {
1076 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1078 score.rule = 7;
1079 goto record_it;
1080 }
1081 } else {
1082 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1083 continue;
1084 }
5e2707fa
YH		 1085#else
1086 if (hiscore.rule < 7)
1087 hiscore.rule++;
44fd0261 1088#endif
072047e4 1089 /* Rule 8: Use longest matching prefix */
12da2a43 1090 if (hiscore.rule < 8) {
072047e4 1091 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1092 hiscore.rule++;
1093 }
072047e4
YH		 1094 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1095 if (score.matchlen > hiscore.matchlen) {
1096 score.rule = 8;
1097 goto record_it;
1da177e4 1098 }
072047e4
YH		 1099#if 0
1100 else if (score.matchlen < hiscore.matchlen)
1101 continue;
1102#endif
1103
1104 /* Final Rule: choose first available one */
1105 continue;
1106record_it:
1107 if (ifa_result)
1108 in6_ifa_put(ifa_result);
1109 in6_ifa_hold(ifa);
1110 ifa_result = ifa;
1111 hiscore = score;
1da177e4 1112 }
072047e4 1113 read_unlock_bh(&idev->lock);
1da177e4 1114 }
8814c4b5 1115 rcu_read_unlock();
1da177e4
LT		 1116 read_unlock(&dev_base_lock);
1117
072047e4
YH		 1118 if (!ifa_result)
1119 return -EADDRNOTAVAIL;
1ab1457c 1120
072047e4
YH		 1121 ipv6_addr_copy(saddr, &ifa_result->addr);
1122 in6_ifa_put(ifa_result);
1123 return 0;
1da177e4
LT		 1124}
1125
1126
1127int ipv6_get_saddr(struct dst_entry *dst,
1128 struct in6_addr *daddr, struct in6_addr *saddr)
1129{
7a3025b1 1130 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1131}
1132
7159039a 1133EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1134
95c385b4
NH		 1135int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1136 unsigned char banned_flags)
1da177e4
LT		 1137{
1138 struct inet6_dev *idev;
1139 int err = -EADDRNOTAVAIL;
1140
8814c4b5 1141 rcu_read_lock();
1da177e4
LT		 1142 if ((idev = __in6_dev_get(dev)) != NULL) {
1143 struct inet6_ifaddr *ifp;
1144
1145 read_lock_bh(&idev->lock);
1146 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1147 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1148 ipv6_addr_copy(addr, &ifp->addr);
1149 err = 0;
1150 break;
1151 }
1152 }
1153 read_unlock_bh(&idev->lock);
1154 }
8814c4b5 1155 rcu_read_unlock();
1da177e4
LT		 1156 return err;
1157}
1158
1159static int ipv6_count_addresses(struct inet6_dev *idev)
1160{
1161 int cnt = 0;
1162 struct inet6_ifaddr *ifp;
1163
1164 read_lock_bh(&idev->lock);
1165 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1166 cnt++;
1167 read_unlock_bh(&idev->lock);
1168 return cnt;
1169}
1170
1171int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1172{
1173 struct inet6_ifaddr * ifp;
1174 u8 hash = ipv6_addr_hash(addr);
1175
1176 read_lock_bh(&addrconf_hash_lock);
1177 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1178 if (ipv6_addr_equal(&ifp->addr, addr) &&
1179 !(ifp->flags&IFA_F_TENTATIVE)) {
1180 if (dev == NULL || ifp->idev->dev == dev ||
1181 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1182 break;
1183 }
1184 }
1185 read_unlock_bh(&addrconf_hash_lock);
1186 return ifp != NULL;
1187}
1188
7159039a
YH		 1189EXPORT_SYMBOL(ipv6_chk_addr);
1190
1da177e4
LT		 1191static
1192int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1193{
1194 struct inet6_ifaddr * ifp;
1195 u8 hash = ipv6_addr_hash(addr);
1196
1197 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1198 if (ipv6_addr_equal(&ifp->addr, addr)) {
1199 if (dev == NULL || ifp->idev->dev == dev)
1200 break;
1201 }
1202 }
1203 return ifp != NULL;
1204}
1205
1206struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1207{
1208 struct inet6_ifaddr * ifp;
1209 u8 hash = ipv6_addr_hash(addr);
1210
1211 read_lock_bh(&addrconf_hash_lock);
1212 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1213 if (ipv6_addr_equal(&ifp->addr, addr)) {
1214 if (dev == NULL || ifp->idev->dev == dev ||
1215 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1216 in6_ifa_hold(ifp);
1217 break;
1218 }
1219 }
1220 }
1221 read_unlock_bh(&addrconf_hash_lock);
1222
1223 return ifp;
1224}
1225
1226int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1227{
1228 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1229 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1230 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1231 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1232 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1233 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1234 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1235 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1236
1237 if (!sk2_rcv_saddr && !sk_ipv6only)
1238 return 1;
1239
1240 if (addr_type2 == IPV6_ADDR_ANY &&
1241 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1242 return 1;
1243
1244 if (addr_type == IPV6_ADDR_ANY &&
1245 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1246 return 1;
1247
1248 if (sk2_rcv_saddr6 &&
1249 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1250 return 1;
1251
1252 if (addr_type == IPV6_ADDR_MAPPED &&
1253 !sk2_ipv6only &&
1254 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1255 return 1;
1256
1257 return 0;
1258}
1259
1260/* Gets referenced address, destroys ifaddr */
1261
9f5336e2 1262static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1263{
1da177e4
LT		 1264 if (ifp->flags&IFA_F_PERMANENT) {
1265 spin_lock_bh(&ifp->lock);
1266 addrconf_del_timer(ifp);
1267 ifp->flags |= IFA_F_TENTATIVE;
1268 spin_unlock_bh(&ifp->lock);
1269 in6_ifa_put(ifp);
1270#ifdef CONFIG_IPV6_PRIVACY
1271 } else if (ifp->flags&IFA_F_TEMPORARY) {
1272 struct inet6_ifaddr *ifpub;
1273 spin_lock_bh(&ifp->lock);
1274 ifpub = ifp->ifpub;
1275 if (ifpub) {
1276 in6_ifa_hold(ifpub);
1277 spin_unlock_bh(&ifp->lock);
1278 ipv6_create_tempaddr(ifpub, ifp);
1279 in6_ifa_put(ifpub);
1280 } else {
1281 spin_unlock_bh(&ifp->lock);
1282 }
1283 ipv6_del_addr(ifp);
1284#endif
1285 } else
1286 ipv6_del_addr(ifp);
1287}
1288
3c21edbd
YH		 1289void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1290{
1291 if (net_ratelimit())
1292 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1293 addrconf_dad_stop(ifp);
1294}
1da177e4
LT		 1295
1296/* Join to solicited addr multicast group. */
1297
1298void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1299{
1300 struct in6_addr maddr;
1301
1302 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1303 return;
1304
1305 addrconf_addr_solict_mult(addr, &maddr);
1306 ipv6_dev_mc_inc(dev, &maddr);
1307}
1308
1309void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1310{
1311 struct in6_addr maddr;
1312
1313 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1314 return;
1315
1316 addrconf_addr_solict_mult(addr, &maddr);
1317 __ipv6_dev_mc_dec(idev, &maddr);
1318}
1319
20380731 1320static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1321{
1322 struct in6_addr addr;
1323 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1324 if (ipv6_addr_any(&addr))
1325 return;
1326 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1327}
1328
20380731 1329static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1330{
1331 struct in6_addr addr;
1332 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1333 if (ipv6_addr_any(&addr))
1334 return;
1335 __ipv6_dev_ac_dec(ifp->idev, &addr);
1336}
1337
073a8e0e
YH		 1338static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1339{
1340 if (dev->addr_len != ETH_ALEN)
1341 return -1;
1342 memcpy(eui, dev->dev_addr, 3);
1343 memcpy(eui + 5, dev->dev_addr + 3, 3);
1344
1345 /*
1346 * The zSeries OSA network cards can be shared among various
1347 * OS instances, but the OSA cards have only one MAC address.
1348 * This leads to duplicate address conflicts in conjunction
1349 * with IPv6 if more than one instance uses the same card.
1350 *
1351 * The driver for these cards can deliver a unique 16-bit
1352 * identifier for each instance sharing the same card. It is
1353 * placed instead of 0xFFFE in the interface identifier. The
1354 * "u" bit of the interface identifier is not inverted in this
1355 * case. Hence the resulting interface identifier has local
1356 * scope according to RFC2373.
1357 */
1358 if (dev->dev_id) {
1359 eui[3] = (dev->dev_id >> 8) & 0xFF;
1360 eui[4] = dev->dev_id & 0xFF;
1361 } else {
1362 eui[3] = 0xFF;
1363 eui[4] = 0xFE;
1364 eui[0] ^= 2;
1365 }
1366 return 0;
1367}
1368
1369static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1370{
1371 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1372 if (dev->addr_len != ARCNET_ALEN)
1373 return -1;
1374 memset(eui, 0, 7);
1375 eui[7] = *(u8*)dev->dev_addr;
1376 return 0;
1377}
1378
1379static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1380{
1381 if (dev->addr_len != INFINIBAND_ALEN)
1382 return -1;
1383 memcpy(eui, dev->dev_addr + 12, 8);
1384 eui[0] |= 2;
1385 return 0;
1386}
1387
1da177e4
LT		 1388static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1389{
1390 switch (dev->type) {
1391 case ARPHRD_ETHER:
1392 case ARPHRD_FDDI:
1393 case ARPHRD_IEEE802_TR:
073a8e0e 1394 return addrconf_ifid_eui48(eui, dev);
1da177e4 1395 case ARPHRD_ARCNET:
073a8e0e 1396 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1397 case ARPHRD_INFINIBAND:
073a8e0e 1398 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1399 }
1400 return -1;
1401}
1402
1403static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1404{
1405 int err = -1;
1406 struct inet6_ifaddr *ifp;
1407
1408 read_lock_bh(&idev->lock);
1409 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1411 memcpy(eui, ifp->addr.s6_addr+8, 8);
1412 err = 0;
1413 break;
1414 }
1415 }
1416 read_unlock_bh(&idev->lock);
1417 return err;
1418}
1419
1420#ifdef CONFIG_IPV6_PRIVACY
1421/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1422static int __ipv6_regen_rndid(struct inet6_dev *idev)
1423{
1da177e4 1424regen:
955189ef 1425 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1426 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1427
1428 /*
1429 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1430 * check if generated address is not inappropriate
1431 *
1432 * - Reserved subnet anycast (RFC 2526)
1433 * 11111101 11....11 1xxxxxxx
1434 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1435 * 00-00-5E-FE-xx-xx-xx-xx
1436 * - value 0
1437 * - XXX: already assigned to an address on the device
1438 */
1ab1457c 1439 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1440 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1441 (idev->rndid[7]&0x80))
1442 goto regen;
1443 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1444 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1445 goto regen;
1446 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1447 goto regen;
1448 }
1449
1450 return 0;
1451}
1452
1453static void ipv6_regen_rndid(unsigned long data)
1454{
1455 struct inet6_dev *idev = (struct inet6_dev *) data;
1456 unsigned long expires;
1457
8814c4b5 1458 rcu_read_lock_bh();
1da177e4
LT		 1459 write_lock_bh(&idev->lock);
1460
1461 if (idev->dead)
1462 goto out;
1463
1464 if (__ipv6_regen_rndid(idev) < 0)
1465 goto out;
1ab1457c 1466
1da177e4 1467 expires = jiffies +
1ab1457c 1468 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1469 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1470 if (time_before(expires, jiffies)) {
1471 printk(KERN_WARNING
1472 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1473 idev->dev->name);
1474 goto out;
1475 }
1476
1477 if (!mod_timer(&idev->regen_timer, expires))
1478 in6_dev_hold(idev);
1479
1480out:
1481 write_unlock_bh(&idev->lock);
8814c4b5 1482 rcu_read_unlock_bh();
1da177e4
LT		 1483 in6_dev_put(idev);
1484}
1485
1486static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1487 int ret = 0;
1488
1489 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1490 ret = __ipv6_regen_rndid(idev);
1491 return ret;
1492}
1493#endif
1494
1495/*
1496 * Add prefix route.
1497 */
1498
1499static void
1500addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1501 unsigned long expires, u32 flags)
1da177e4 1502{
86872cb5
TG		 1503 struct fib6_config cfg = {
1504 .fc_table = RT6_TABLE_PREFIX,
1505 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1506 .fc_ifindex = dev->ifindex,
1507 .fc_expires = expires,
1508 .fc_dst_len = plen,
1509 .fc_flags = RTF_UP | flags,
1510 };
1da177e4 1511
86872cb5 1512 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1513
1514 /* Prevent useless cloning on PtP SIT.
1515 This thing is done here expecting that the whole
1516 class of non-broadcast devices need not cloning.
1517 */
0be669bb 1518#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1519 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1520 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1521#endif
1da177e4 1522
86872cb5 1523 ip6_route_add(&cfg);
1da177e4
LT		 1524}
1525
1526/* Create "default" multicast route to the interface */
1527
1528static void addrconf_add_mroute(struct net_device *dev)
1529{
86872cb5
TG		 1530 struct fib6_config cfg = {
1531 .fc_table = RT6_TABLE_LOCAL,
1532 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1533 .fc_ifindex = dev->ifindex,
1534 .fc_dst_len = 8,
1535 .fc_flags = RTF_UP,
1536 };
1537
1538 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1539
1540 ip6_route_add(&cfg);
1da177e4
LT		 1541}
1542
0be669bb 1543#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1544static void sit_route_add(struct net_device *dev)
1545{
86872cb5
TG		 1546 struct fib6_config cfg = {
1547 .fc_table = RT6_TABLE_MAIN,
1548 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1549 .fc_ifindex = dev->ifindex,
1550 .fc_dst_len = 96,
1551 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1552 };
1da177e4
LT		 1553
1554 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1555 ip6_route_add(&cfg);
1da177e4 1556}
0be669bb 1557#endif
1da177e4
LT		 1558
1559static void addrconf_add_lroute(struct net_device *dev)
1560{
1561 struct in6_addr addr;
1562
1563 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1564 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1565}
1566
1567static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1568{
1569 struct inet6_dev *idev;
1570
1571 ASSERT_RTNL();
1572
1573 if ((idev = ipv6_find_idev(dev)) == NULL)
1574 return NULL;
1575
1576 /* Add default multicast route */
1577 addrconf_add_mroute(dev);
1578
1579 /* Add link local route */
1580 addrconf_add_lroute(dev);
1581 return idev;
1582}
1583
1584void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1585{
1586 struct prefix_info *pinfo;
1587 __u32 valid_lft;
1588 __u32 prefered_lft;
1589 int addr_type;
1590 unsigned long rt_expires;
1591 struct inet6_dev *in6_dev;
1592
1593 pinfo = (struct prefix_info *) opt;
1ab1457c 1594
1da177e4
LT		 1595 if (len < sizeof(struct prefix_info)) {
1596 ADBG(("addrconf: prefix option too short\n"));
1597 return;
1598 }
1ab1457c 1599
1da177e4
LT		 1600 /*
1601 * Validation checks ([ADDRCONF], page 19)
1602 */
1603
1604 addr_type = ipv6_addr_type(&pinfo->prefix);
1605
1606 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1607 return;
1608
1609 valid_lft = ntohl(pinfo->valid);
1610 prefered_lft = ntohl(pinfo->prefered);
1611
1612 if (prefered_lft > valid_lft) {
1613 if (net_ratelimit())
1614 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1615 return;
1616 }
1617
1618 in6_dev = in6_dev_get(dev);
1619
1620 if (in6_dev == NULL) {
1621 if (net_ratelimit())
1622 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1623 return;
1624 }
1625
1626 /*
1627 * Two things going on here:
1628 * 1) Add routes for on-link prefixes
1629 * 2) Configure prefixes with the auto flag set
1630 */
1631
1632 /* Avoid arithmetic overflow. Really, we could
1633 save rt_expires in seconds, likely valid_lft,
1634 but it would require division in fib gc, that it
1635 not good.
1636 */
1637 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1638 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1639 else
3dd4bc68
YH		 1640 rt_expires = valid_lft * HZ;
1641
1642 /*
1643 * We convert this (in jiffies) to clock_t later.
1644 * Avoid arithmetic overflow there as well.
1645 * Overflow can happen only if HZ < USER_HZ.
1646 */
1647 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1648 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1649
1650 if (pinfo->onlink) {
1651 struct rt6_info *rt;
1652 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1653
1654 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1655 if (rt->rt6i_flags&RTF_EXPIRES) {
1656 if (valid_lft == 0) {
e0a1ad73 1657 ip6_del_rt(rt);
1da177e4
LT		 1658 rt = NULL;
1659 } else {
3dd4bc68 1660 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1661 }
1662 }
1663 } else if (valid_lft) {
1664 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1665 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1666 }
1667 if (rt)
1668 dst_release(&rt->u.dst);
1669 }
1670
1671 /* Try to figure out our local address for this prefix */
1672
1673 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1674 struct inet6_ifaddr * ifp;
1675 struct in6_addr addr;
1676 int create = 0, update_lft = 0;
1677
1678 if (pinfo->prefix_len == 64) {
1679 memcpy(&addr, &pinfo->prefix, 8);
1680 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1681 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1682 in6_dev_put(in6_dev);
1683 return;
1684 }
1685 goto ok;
1686 }
1687 if (net_ratelimit())
1688 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1689 pinfo->prefix_len);
1690 in6_dev_put(in6_dev);
1691 return;
1692
1693ok:
1694
1695 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1696
1697 if (ifp == NULL && valid_lft) {
1698 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1699 u32 addr_flags = 0;
1700
1701#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1702 if (in6_dev->cnf.optimistic_dad &&
1703 !ipv6_devconf.forwarding)
1704 addr_flags = IFA_F_OPTIMISTIC;
1705#endif
1da177e4
LT		 1706
1707 /* Do not allow to create too much of autoconfigured
1708 * addresses; this would be too easy way to crash kernel.
1709 */
1710 if (!max_addresses ||
1711 ipv6_count_addresses(in6_dev) < max_addresses)
1712 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1713 addr_type&IPV6_ADDR_SCOPE_MASK,
1714 addr_flags);
1da177e4
LT		 1715
1716 if (!ifp || IS_ERR(ifp)) {
1717 in6_dev_put(in6_dev);
1718 return;
1719 }
1720
1721 update_lft = create = 1;
1722 ifp->cstamp = jiffies;
1723 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1724 }
1725
1726 if (ifp) {
1727 int flags;
1728 unsigned long now;
1729#ifdef CONFIG_IPV6_PRIVACY
1730 struct inet6_ifaddr *ift;
1731#endif
1732 u32 stored_lft;
1733
1734 /* update lifetime (RFC2462 5.5.3 e) */
1735 spin_lock(&ifp->lock);
1736 now = jiffies;
1737 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1738 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1739 else
1740 stored_lft = 0;
1741 if (!update_lft && stored_lft) {
1742 if (valid_lft > MIN_VALID_LIFETIME ||
1743 valid_lft > stored_lft)
1744 update_lft = 1;
1745 else if (stored_lft <= MIN_VALID_LIFETIME) {
1746 /* valid_lft <= stored_lft is always true */
1747 /* XXX: IPsec */
1748 update_lft = 0;
1749 } else {
1750 valid_lft = MIN_VALID_LIFETIME;
1751 if (valid_lft < prefered_lft)
1752 prefered_lft = valid_lft;
1753 update_lft = 1;
1754 }
1755 }
1756
1757 if (update_lft) {
1758 ifp->valid_lft = valid_lft;
1759 ifp->prefered_lft = prefered_lft;
1760 ifp->tstamp = now;
1761 flags = ifp->flags;
1762 ifp->flags &= ~IFA_F_DEPRECATED;
1763 spin_unlock(&ifp->lock);
1764
1765 if (!(flags&IFA_F_TENTATIVE))
1766 ipv6_ifa_notify(0, ifp);
1767 } else
1768 spin_unlock(&ifp->lock);
1769
1770#ifdef CONFIG_IPV6_PRIVACY
1771 read_lock_bh(&in6_dev->lock);
1772 /* update all temporary addresses in the list */
1773 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1774 /*
1775 * When adjusting the lifetimes of an existing
1776 * temporary address, only lower the lifetimes.
1777 * Implementations must not increase the
1778 * lifetimes of an existing temporary address
1779 * when processing a Prefix Information Option.
1780 */
1781 spin_lock(&ift->lock);
1782 flags = ift->flags;
1783 if (ift->valid_lft > valid_lft &&
1784 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1785 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1786 if (ift->prefered_lft > prefered_lft &&
1787 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1788 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1789 spin_unlock(&ift->lock);
1790 if (!(flags&IFA_F_TENTATIVE))
1791 ipv6_ifa_notify(0, ift);
1792 }
1793
1794 if (create && in6_dev->cnf.use_tempaddr > 0) {
1795 /*
1796 * When a new public address is created as described in [ADDRCONF],
1797 * also create a new temporary address.
1798 */
1ab1457c 1799 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1800 ipv6_create_tempaddr(ifp, NULL);
1801 } else {
1802 read_unlock_bh(&in6_dev->lock);
1803 }
1804#endif
1805 in6_ifa_put(ifp);
1806 addrconf_verify(0);
1807 }
1808 }
1809 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1810 in6_dev_put(in6_dev);
1811}
1812
1813/*
1814 * Set destination address.
1815 * Special case for SIT interfaces where we create a new "virtual"
1816 * device.
1817 */
1818int addrconf_set_dstaddr(void __user *arg)
1819{
1820 struct in6_ifreq ireq;
1821 struct net_device *dev;
1822 int err = -EINVAL;
1823
1824 rtnl_lock();
1825
1826 err = -EFAULT;
1827 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1828 goto err_exit;
1829
1830 dev = __dev_get_by_index(ireq.ifr6_ifindex);
1831
1832 err = -ENODEV;
1833 if (dev == NULL)
1834 goto err_exit;
1835
0be669bb 1836#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1837 if (dev->type == ARPHRD_SIT) {
1838 struct ifreq ifr;
1839 mm_segment_t oldfs;
1840 struct ip_tunnel_parm p;
1841
1842 err = -EADDRNOTAVAIL;
1843 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1844 goto err_exit;
1845
1846 memset(&p, 0, sizeof(p));
1847 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1848 p.iph.saddr = 0;
1849 p.iph.version = 4;
1850 p.iph.ihl = 5;
1851 p.iph.protocol = IPPROTO_IPV6;
1852 p.iph.ttl = 64;
1853 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1854
1855 oldfs = get_fs(); set_fs(KERNEL_DS);
1856 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1857 set_fs(oldfs);
1858
1859 if (err == 0) {
1860 err = -ENOBUFS;
1861 if ((dev = __dev_get_by_name(p.name)) == NULL)
1862 goto err_exit;
1863 err = dev_open(dev);
1864 }
1865 }
0be669bb 1866#endif
1da177e4
LT		 1867
1868err_exit:
1869 rtnl_unlock();
1870 return err;
1871}
1872
1873/*
1874 * Manual configuration of address on an interface
1875 */
0778769d 1876static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1877 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1878{
1879 struct inet6_ifaddr *ifp;
1880 struct inet6_dev *idev;
1881 struct net_device *dev;
1882 int scope;
46d48046 1883 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1884
1885 ASSERT_RTNL();
1ab1457c 1886
0778769d
NT		 1887 /* check the lifetime */
1888 if (!valid_lft || prefered_lft > valid_lft)
1889 return -EINVAL;
1890
1da177e4
LT		 1891 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1892 return -ENODEV;
1ab1457c 1893
1da177e4
LT		 1894 if ((idev = addrconf_add_dev(dev)) == NULL)
1895 return -ENOBUFS;
1896
1897 scope = ipv6_addr_scope(pfx);
1898
46d48046 1899 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1900 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1901 flags = 0;
1902 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1903 valid_lft = 0x7FFFFFFF/HZ;
1904
1905 if (prefered_lft == 0)
1906 ifa_flags |= IFA_F_DEPRECATED;
1907 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1908 (prefered_lft != INFINITY_LIFE_TIME))
1909 prefered_lft = 0x7FFFFFFF/HZ;
1910
1911 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1912
1da177e4 1913 if (!IS_ERR(ifp)) {
06aebfb7 1914 spin_lock_bh(&ifp->lock);
0778769d
NT		 1915 ifp->valid_lft = valid_lft;
1916 ifp->prefered_lft = prefered_lft;
1917 ifp->tstamp = jiffies;
06aebfb7 1918 spin_unlock_bh(&ifp->lock);
0778769d 1919
46d48046
YH		 1920 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1921 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1922 /*
1923 * Note that section 3.1 of RFC 4429 indicates
1924 * that the Optimistic flag should not be set for
1925 * manually configured addresses
1926 */
1da177e4
LT		 1927 addrconf_dad_start(ifp, 0);
1928 in6_ifa_put(ifp);
0778769d 1929 addrconf_verify(0);
1da177e4
LT		 1930 return 0;
1931 }
1932
1933 return PTR_ERR(ifp);
1934}
1935
1936static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1937{
1938 struct inet6_ifaddr *ifp;
1939 struct inet6_dev *idev;
1940 struct net_device *dev;
1ab1457c 1941
1da177e4
LT		 1942 if ((dev = __dev_get_by_index(ifindex)) == NULL)
1943 return -ENODEV;
1944
1945 if ((idev = __in6_dev_get(dev)) == NULL)
1946 return -ENXIO;
1947
1948 read_lock_bh(&idev->lock);
1949 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1950 if (ifp->prefix_len == plen &&
1951 ipv6_addr_equal(pfx, &ifp->addr)) {
1952 in6_ifa_hold(ifp);
1953 read_unlock_bh(&idev->lock);
1ab1457c 1954
1da177e4
LT		 1955 ipv6_del_addr(ifp);
1956
1957 /* If the last address is deleted administratively,
1958 disable IPv6 on this interface.
1959 */
1960 if (idev->addr_list == NULL)
1961 addrconf_ifdown(idev->dev, 1);
1962 return 0;
1963 }
1964 }
1965 read_unlock_bh(&idev->lock);
1966 return -EADDRNOTAVAIL;
1967}
1968
1969
1970int addrconf_add_ifaddr(void __user *arg)
1971{
1972 struct in6_ifreq ireq;
1973 int err;
1ab1457c 1974
1da177e4
LT		 1975 if (!capable(CAP_NET_ADMIN))
1976 return -EPERM;
1ab1457c 1977
1da177e4
LT		 1978 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1979 return -EFAULT;
1980
1981 rtnl_lock();
0778769d 1982 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 1983 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 1984 rtnl_unlock();
1985 return err;
1986}
1987
1988int addrconf_del_ifaddr(void __user *arg)
1989{
1990 struct in6_ifreq ireq;
1991 int err;
1ab1457c 1992
1da177e4
LT		 1993 if (!capable(CAP_NET_ADMIN))
1994 return -EPERM;
1995
1996 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1997 return -EFAULT;
1998
1999 rtnl_lock();
2000 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2001 rtnl_unlock();
2002 return err;
2003}
2004
0be669bb 2005#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2006static void sit_add_v4_addrs(struct inet6_dev *idev)
2007{
2008 struct inet6_ifaddr * ifp;
2009 struct in6_addr addr;
2010 struct net_device *dev;
2011 int scope;
2012
2013 ASSERT_RTNL();
2014
2015 memset(&addr, 0, sizeof(struct in6_addr));
2016 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2017
2018 if (idev->dev->flags&IFF_POINTOPOINT) {
2019 addr.s6_addr32[0] = htonl(0xfe800000);
2020 scope = IFA_LINK;
2021 } else {
2022 scope = IPV6_ADDR_COMPATv4;
2023 }
2024
2025 if (addr.s6_addr32[3]) {
2026 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2027 if (!IS_ERR(ifp)) {
2028 spin_lock_bh(&ifp->lock);
2029 ifp->flags &= ~IFA_F_TENTATIVE;
2030 spin_unlock_bh(&ifp->lock);
2031 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2032 in6_ifa_put(ifp);
2033 }
2034 return;
2035 }
2036
1ab1457c 2037 for (dev = dev_base; dev != NULL; dev = dev->next) {
e5ed6399 2038 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2039 if (in_dev && (dev->flags & IFF_UP)) {
2040 struct in_ifaddr * ifa;
2041
2042 int flag = scope;
2043
2044 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2045 int plen;
2046
2047 addr.s6_addr32[3] = ifa->ifa_local;
2048
2049 if (ifa->ifa_scope == RT_SCOPE_LINK)
2050 continue;
2051 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2052 if (idev->dev->flags&IFF_POINTOPOINT)
2053 continue;
2054 flag |= IFA_HOST;
2055 }
2056 if (idev->dev->flags&IFF_POINTOPOINT)
2057 plen = 64;
2058 else
2059 plen = 96;
2060
2061 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2062 IFA_F_PERMANENT);
2063 if (!IS_ERR(ifp)) {
2064 spin_lock_bh(&ifp->lock);
2065 ifp->flags &= ~IFA_F_TENTATIVE;
2066 spin_unlock_bh(&ifp->lock);
2067 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2068 in6_ifa_put(ifp);
2069 }
2070 }
2071 }
1ab1457c 2072 }
1da177e4 2073}
0be669bb 2074#endif
1da177e4
LT		 2075
2076static void init_loopback(struct net_device *dev)
2077{
2078 struct inet6_dev *idev;
2079 struct inet6_ifaddr * ifp;
2080
2081 /* ::1 */
2082
2083 ASSERT_RTNL();
2084
2085 if ((idev = ipv6_find_idev(dev)) == NULL) {
2086 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2087 return;
2088 }
2089
2090 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2091 if (!IS_ERR(ifp)) {
2092 spin_lock_bh(&ifp->lock);
2093 ifp->flags &= ~IFA_F_TENTATIVE;
2094 spin_unlock_bh(&ifp->lock);
2095 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2096 in6_ifa_put(ifp);
2097 }
2098}
2099
2100static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2101{
2102 struct inet6_ifaddr * ifp;
95c385b4
NH		 2103 u32 addr_flags = IFA_F_PERMANENT;
2104
2105#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2106 if (idev->cnf.optimistic_dad &&
2107 !ipv6_devconf.forwarding)
2108 addr_flags |= IFA_F_OPTIMISTIC;
2109#endif
1da177e4 2110
95c385b4
NH		 2111
2112 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2113 if (!IS_ERR(ifp)) {
46d48046 2114 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2115 addrconf_dad_start(ifp, 0);
2116 in6_ifa_put(ifp);
2117 }
2118}
2119
2120static void addrconf_dev_config(struct net_device *dev)
2121{
2122 struct in6_addr addr;
2123 struct inet6_dev * idev;
2124
2125 ASSERT_RTNL();
2126
1ab1457c 2127 if ((dev->type != ARPHRD_ETHER) &&
1da177e4
LT		 2128 (dev->type != ARPHRD_FDDI) &&
2129 (dev->type != ARPHRD_IEEE802_TR) &&
2130 (dev->type != ARPHRD_ARCNET) &&
2131 (dev->type != ARPHRD_INFINIBAND)) {
2132 /* Alas, we support only Ethernet autoconfiguration. */
2133 return;
2134 }
2135
2136 idev = addrconf_add_dev(dev);
2137 if (idev == NULL)
2138 return;
2139
2140 memset(&addr, 0, sizeof(struct in6_addr));
2141 addr.s6_addr32[0] = htonl(0xFE800000);
2142
2143 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2144 addrconf_add_linklocal(idev, &addr);
2145}
2146
0be669bb 2147#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2148static void addrconf_sit_config(struct net_device *dev)
2149{
2150 struct inet6_dev *idev;
2151
2152 ASSERT_RTNL();
2153
1ab1457c
YH		 2154 /*
2155 * Configure the tunnel with one of our IPv4
2156 * addresses... we should configure all of
1da177e4
LT		 2157 * our v4 addrs in the tunnel
2158 */
2159
2160 if ((idev = ipv6_find_idev(dev)) == NULL) {
2161 printk(KERN_DEBUG "init sit: add_dev failed\n");
2162 return;
2163 }
2164
2165 sit_add_v4_addrs(idev);
2166
2167 if (dev->flags&IFF_POINTOPOINT) {
2168 addrconf_add_mroute(dev);
2169 addrconf_add_lroute(dev);
2170 } else
2171 sit_route_add(dev);
2172}
0be669bb 2173#endif
1da177e4
LT		 2174
2175static inline int
2176ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2177{
2178 struct in6_addr lladdr;
2179
95c385b4 2180 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2181 addrconf_add_linklocal(idev, &lladdr);
2182 return 0;
2183 }
2184 return -1;
2185}
2186
2187static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2188{
2189 struct net_device *link_dev;
2190
2191 /* first try to inherit the link-local address from the link device */
2192 if (idev->dev->iflink &&
2193 (link_dev = __dev_get_by_index(idev->dev->iflink))) {
2194 if (!ipv6_inherit_linklocal(idev, link_dev))
2195 return;
2196 }
2197 /* then try to inherit it from any device */
2198 for (link_dev = dev_base; link_dev; link_dev = link_dev->next) {
2199 if (!ipv6_inherit_linklocal(idev, link_dev))
2200 return;
2201 }
2202 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2203}
2204
2205/*
2206 * Autoconfigure tunnel with a link-local address so routing protocols,
2207 * DHCPv6, MLD etc. can be run over the virtual link
2208 */
2209
2210static void addrconf_ip6_tnl_config(struct net_device *dev)
2211{
2212 struct inet6_dev *idev;
2213
2214 ASSERT_RTNL();
2215
2216 if ((idev = addrconf_add_dev(dev)) == NULL) {
2217 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2218 return;
2219 }
2220 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2221}
2222
1ab1457c 2223static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2224 void * data)
2225{
2226 struct net_device *dev = (struct net_device *) data;
2227 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2228 int run_pending = 0;
1da177e4
LT		 2229
2230 switch(event) {
45ba9dd2
YH		 2231 case NETDEV_REGISTER:
2232 if (!idev) {
2233 idev = ipv6_add_dev(dev);
2234 if (!idev)
2235 printk(KERN_WARNING "IPv6: add_dev failed for %s\n",
2236 dev->name);
2237 }
2238 break;
1da177e4 2239 case NETDEV_UP:
3c21edbd
YH		 2240 case NETDEV_CHANGE:
2241 if (event == NETDEV_UP) {
2242 if (!netif_carrier_ok(dev)) {
2243 /* device is not ready yet. */
2244 printk(KERN_INFO
2245 "ADDRCONF(NETDEV_UP): %s: "
2246 "link is not ready\n",
2247 dev->name);
2248 break;
2249 }
99081049
KS		 2250
2251 if (idev)
2252 idev->if_flags |= IF_READY;
3c21edbd
YH		 2253 } else {
2254 if (!netif_carrier_ok(dev)) {
2255 /* device is still not ready. */
2256 break;
2257 }
2258
2259 if (idev) {
2260 if (idev->if_flags & IF_READY) {
2261 /* device is already configured. */
2262 break;
2263 }
2264 idev->if_flags |= IF_READY;
2265 }
2266
2267 printk(KERN_INFO
2268 "ADDRCONF(NETDEV_CHANGE): %s: "
2269 "link becomes ready\n",
2270 dev->name);
2271
c5e33bdd 2272 run_pending = 1;
3c21edbd
YH		 2273 }
2274
1da177e4 2275 switch(dev->type) {
0be669bb 2276#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2277 case ARPHRD_SIT:
2278 addrconf_sit_config(dev);
2279 break;
0be669bb 2280#endif
1da177e4
LT		 2281 case ARPHRD_TUNNEL6:
2282 addrconf_ip6_tnl_config(dev);
2283 break;
2284 case ARPHRD_LOOPBACK:
2285 init_loopback(dev);
2286 break;
2287
2288 default:
2289 addrconf_dev_config(dev);
2290 break;
3ff50b79 2291 }
1da177e4 2292 if (idev) {
c5e33bdd
YH		 2293 if (run_pending)
2294 addrconf_dad_run(idev);
2295
1da177e4
LT		 2296 /* If the MTU changed during the interface down, when the
2297 interface up, the changed MTU must be reflected in the
2298 idev as well as routers.
2299 */
2300 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2301 rt6_mtu_change(dev, dev->mtu);
2302 idev->cnf.mtu6 = dev->mtu;
2303 }
2304 idev->tstamp = jiffies;
2305 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2306 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2307 stop IPv6 on this interface.
2308 */
2309 if (dev->mtu < IPV6_MIN_MTU)
2310 addrconf_ifdown(dev, event != NETDEV_DOWN);
2311 }
2312 break;
2313
2314 case NETDEV_CHANGEMTU:
2315 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2316 rt6_mtu_change(dev, dev->mtu);
2317 idev->cnf.mtu6 = dev->mtu;
2318 break;
2319 }
2320
2321 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2322
2323 case NETDEV_DOWN:
2324 case NETDEV_UNREGISTER:
2325 /*
2326 * Remove all addresses from this interface.
2327 */
2328 addrconf_ifdown(dev, event != NETDEV_DOWN);
2329 break;
3c21edbd 2330
1da177e4
LT		 2331 case NETDEV_CHANGENAME:
2332#ifdef CONFIG_SYSCTL
2333 if (idev) {
2334 addrconf_sysctl_unregister(&idev->cnf);
2335 neigh_sysctl_unregister(idev->nd_parms);
2336 neigh_sysctl_register(dev, idev->nd_parms,
2337 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2338 &ndisc_ifinfo_sysctl_change,
2339 NULL);
2340 addrconf_sysctl_register(idev, &idev->cnf);
2341 }
2342#endif
2343 break;
3ff50b79 2344 }
1da177e4
LT		 2345
2346 return NOTIFY_OK;
2347}
2348
2349/*
2350 * addrconf module should be notified of a device going up
2351 */
2352static struct notifier_block ipv6_dev_notf = {
2353 .notifier_call = addrconf_notify,
2354 .priority = 0
2355};
2356
2357static int addrconf_ifdown(struct net_device *dev, int how)
2358{
2359 struct inet6_dev *idev;
2360 struct inet6_ifaddr *ifa, **bifa;
2361 int i;
2362
2363 ASSERT_RTNL();
2364
2365 if (dev == &loopback_dev && how == 1)
2366 how = 0;
2367
2368 rt6_ifdown(dev);
2369 neigh_ifdown(&nd_tbl, dev);
2370
2371 idev = __in6_dev_get(dev);
2372 if (idev == NULL)
2373 return -ENODEV;
2374
2375 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2376 Do not dev_put!
1da177e4
LT		 2377 */
2378 if (how == 1) {
1da177e4 2379 idev->dead = 1;
8814c4b5
YH		 2380
2381 /* protected by rtnl_lock */
2382 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2383
2384 /* Step 1.5: remove snmp6 entry */
2385 snmp6_unregister_dev(idev);
2386
2387 }
2388
2389 /* Step 2: clear hash table */
2390 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2391 bifa = &inet6_addr_lst[i];
2392
2393 write_lock_bh(&addrconf_hash_lock);
2394 while ((ifa = *bifa) != NULL) {
2395 if (ifa->idev == idev) {
2396 *bifa = ifa->lst_next;
2397 ifa->lst_next = NULL;
2398 addrconf_del_timer(ifa);
2399 in6_ifa_put(ifa);
2400 continue;
2401 }
2402 bifa = &ifa->lst_next;
2403 }
2404 write_unlock_bh(&addrconf_hash_lock);
2405 }
2406
2407 write_lock_bh(&idev->lock);
2408
2409 /* Step 3: clear flags for stateless addrconf */
2410 if (how != 1)
3c21edbd 2411 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2412
2413 /* Step 4: clear address list */
2414#ifdef CONFIG_IPV6_PRIVACY
2415 if (how == 1 && del_timer(&idev->regen_timer))
2416 in6_dev_put(idev);
2417
2418 /* clear tempaddr list */
2419 while ((ifa = idev->tempaddr_list) != NULL) {
2420 idev->tempaddr_list = ifa->tmp_next;
2421 ifa->tmp_next = NULL;
2422 ifa->dead = 1;
2423 write_unlock_bh(&idev->lock);
2424 spin_lock_bh(&ifa->lock);
2425
2426 if (ifa->ifpub) {
2427 in6_ifa_put(ifa->ifpub);
2428 ifa->ifpub = NULL;
2429 }
2430 spin_unlock_bh(&ifa->lock);
2431 in6_ifa_put(ifa);
2432 write_lock_bh(&idev->lock);
2433 }
2434#endif
2435 while ((ifa = idev->addr_list) != NULL) {
2436 idev->addr_list = ifa->if_next;
2437 ifa->if_next = NULL;
2438 ifa->dead = 1;
2439 addrconf_del_timer(ifa);
2440 write_unlock_bh(&idev->lock);
2441
2442 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2443 in6_ifa_put(ifa);
2444
2445 write_lock_bh(&idev->lock);
2446 }
2447 write_unlock_bh(&idev->lock);
2448
2449 /* Step 5: Discard multicast list */
2450
2451 if (how == 1)
2452 ipv6_mc_destroy_dev(idev);
2453 else
2454 ipv6_mc_down(idev);
2455
2456 /* Step 5: netlink notification of this interface */
2457 idev->tstamp = jiffies;
979ad663 2458 inet6_ifinfo_notify(RTM_DELLINK, idev);
1ab1457c 2459
1da177e4
LT		 2460 /* Shot the device (if unregistered) */
2461
2462 if (how == 1) {
2463#ifdef CONFIG_SYSCTL
2464 addrconf_sysctl_unregister(&idev->cnf);
2465 neigh_sysctl_unregister(idev->nd_parms);
2466#endif
2467 neigh_parms_release(&nd_tbl, idev->nd_parms);
2468 neigh_ifdown(&nd_tbl, dev);
2469 in6_dev_put(idev);
2470 }
2471 return 0;
2472}
2473
2474static void addrconf_rs_timer(unsigned long data)
2475{
2476 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2477
2478 if (ifp->idev->cnf.forwarding)
2479 goto out;
2480
2481 if (ifp->idev->if_flags & IF_RA_RCVD) {
2482 /*
2483 * Announcement received after solicitation
2484 * was sent
2485 */
2486 goto out;
2487 }
2488
2489 spin_lock(&ifp->lock);
2490 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2491 struct in6_addr all_routers;
2492
2493 /* The wait after the last probe can be shorter */
2494 addrconf_mod_timer(ifp, AC_RS,
2495 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2496 ifp->idev->cnf.rtr_solicit_delay :
2497 ifp->idev->cnf.rtr_solicit_interval);
2498 spin_unlock(&ifp->lock);
2499
2500 ipv6_addr_all_routers(&all_routers);
2501
2502 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2503 } else {
2504 spin_unlock(&ifp->lock);
2505 /*
2506 * Note: we do not support deprecated "all on-link"
2507 * assumption any longer.
2508 */
2509 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2510 ifp->idev->dev->name);
2511 }
2512
2513out:
2514 in6_ifa_put(ifp);
2515}
2516
2517/*
2518 * Duplicate Address Detection
2519 */
3c21edbd
YH		 2520static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2521{
2522 unsigned long rand_num;
2523 struct inet6_dev *idev = ifp->idev;
2524
95c385b4
NH		 2525 if (ifp->flags & IFA_F_OPTIMISTIC)
2526 rand_num = 0;
2527 else
2528 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2529
3c21edbd
YH		 2530 ifp->probes = idev->cnf.dad_transmits;
2531 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2532}
2533
e431b8c0 2534static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2535{
2536 struct inet6_dev *idev = ifp->idev;
2537 struct net_device *dev = idev->dev;
1da177e4
LT		 2538
2539 addrconf_join_solict(dev, &ifp->addr);
2540
1da177e4 2541 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2542
2543 read_lock_bh(&idev->lock);
2544 if (ifp->dead)
2545 goto out;
2546 spin_lock_bh(&ifp->lock);
2547
2548 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2549 !(ifp->flags&IFA_F_TENTATIVE) ||
2550 ifp->flags & IFA_F_NODAD) {
95c385b4 2551 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2552 spin_unlock_bh(&ifp->lock);
2553 read_unlock_bh(&idev->lock);
2554
2555 addrconf_dad_completed(ifp);
2556 return;
2557 }
2558
6732bade 2559 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2560 spin_unlock_bh(&ifp->lock);
6732bade 2561 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2562 /*
2563 * If the defice is not ready:
2564 * - keep it tentative if it is a permanent address.
2565 * - otherwise, kill it.
2566 */
2567 in6_ifa_hold(ifp);
2568 addrconf_dad_stop(ifp);
6732bade 2569 return;
3c21edbd 2570 }
95c385b4
NH		 2571
2572 /*
2573 * Optimistic nodes can start receiving
2574 * Frames right away
2575 */
2576 if(ifp->flags & IFA_F_OPTIMISTIC)
2577 ip6_ins_rt(ifp->rt);
2578
6732bade
YH		 2579 addrconf_dad_kick(ifp);
2580 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2581out:
2582 read_unlock_bh(&idev->lock);
2583}
2584
2585static void addrconf_dad_timer(unsigned long data)
2586{
2587 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2588 struct inet6_dev *idev = ifp->idev;
2589 struct in6_addr unspec;
2590 struct in6_addr mcaddr;
2591
2592 read_lock_bh(&idev->lock);
2593 if (idev->dead) {
2594 read_unlock_bh(&idev->lock);
2595 goto out;
2596 }
2597 spin_lock_bh(&ifp->lock);
2598 if (ifp->probes == 0) {
2599 /*
2600 * DAD was successful
2601 */
2602
95c385b4 2603 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2604 spin_unlock_bh(&ifp->lock);
2605 read_unlock_bh(&idev->lock);
2606
2607 addrconf_dad_completed(ifp);
2608
2609 goto out;
2610 }
2611
2612 ifp->probes--;
2613 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2614 spin_unlock_bh(&ifp->lock);
2615 read_unlock_bh(&idev->lock);
2616
2617 /* send a neighbour solicitation for our addr */
2618 memset(&unspec, 0, sizeof(unspec));
2619 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2620 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2621out:
2622 in6_ifa_put(ifp);
2623}
2624
2625static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2626{
2627 struct net_device * dev = ifp->idev->dev;
2628
2629 /*
2630 * Configure the address for reception. Now it is valid.
2631 */
2632
2633 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2634
2635 /* If added prefix is link local and forwarding is off,
2636 start sending router solicitations.
2637 */
2638
2639 if (ifp->idev->cnf.forwarding == 0 &&
2640 ifp->idev->cnf.rtr_solicits > 0 &&
2641 (dev->flags&IFF_LOOPBACK) == 0 &&
2642 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2643 struct in6_addr all_routers;
2644
2645 ipv6_addr_all_routers(&all_routers);
2646
2647 /*
2648 * If a host as already performed a random delay
2649 * [...] as part of DAD [...] there is no need
2650 * to delay again before sending the first RS
2651 */
2652 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2653
2654 spin_lock_bh(&ifp->lock);
2655 ifp->probes = 1;
2656 ifp->idev->if_flags |= IF_RS_SENT;
2657 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2658 spin_unlock_bh(&ifp->lock);
2659 }
2660}
2661
c5e33bdd
YH		 2662static void addrconf_dad_run(struct inet6_dev *idev) {
2663 struct inet6_ifaddr *ifp;
2664
2665 read_lock_bh(&idev->lock);
2666 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2667 spin_lock_bh(&ifp->lock);
2668 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2669 spin_unlock_bh(&ifp->lock);
2670 continue;
2671 }
2672 spin_unlock_bh(&ifp->lock);
2673 addrconf_dad_kick(ifp);
2674 }
2675 read_unlock_bh(&idev->lock);
2676}
2677
1da177e4
LT		 2678#ifdef CONFIG_PROC_FS
2679struct if6_iter_state {
2680 int bucket;
2681};
2682
2683static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2684{
2685 struct inet6_ifaddr *ifa = NULL;
2686 struct if6_iter_state *state = seq->private;
2687
2688 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2689 ifa = inet6_addr_lst[state->bucket];
2690 if (ifa)
2691 break;
2692 }
2693 return ifa;
2694}
2695
2696static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2697{
2698 struct if6_iter_state *state = seq->private;
2699
2700 ifa = ifa->lst_next;
2701try_again:
2702 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2703 ifa = inet6_addr_lst[state->bucket];
2704 goto try_again;
2705 }
2706 return ifa;
2707}
2708
2709static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2710{
2711 struct inet6_ifaddr *ifa = if6_get_first(seq);
2712
2713 if (ifa)
2714 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2715 --pos;
2716 return pos ? NULL : ifa;
2717}
2718
2719static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2720{
2721 read_lock_bh(&addrconf_hash_lock);
2722 return if6_get_idx(seq, *pos);
2723}
2724
2725static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2726{
2727 struct inet6_ifaddr *ifa;
2728
2729 ifa = if6_get_next(seq, v);
2730 ++*pos;
2731 return ifa;
2732}
2733
2734static void if6_seq_stop(struct seq_file *seq, void *v)
2735{
2736 read_unlock_bh(&addrconf_hash_lock);
2737}
2738
2739static int if6_seq_show(struct seq_file *seq, void *v)
2740{
2741 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2742 seq_printf(seq,
9343e79a 2743 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2744 NIP6(ifp->addr),
2745 ifp->idev->dev->ifindex,
2746 ifp->prefix_len,
2747 ifp->scope,
2748 ifp->flags,
2749 ifp->idev->dev->name);
2750 return 0;
2751}
2752
2753static struct seq_operations if6_seq_ops = {
2754 .start = if6_seq_start,
2755 .next = if6_seq_next,
2756 .show = if6_seq_show,
2757 .stop = if6_seq_stop,
2758};
2759
2760static int if6_seq_open(struct inode *inode, struct file *file)
2761{
2762 struct seq_file *seq;
2763 int rc = -ENOMEM;
322f74a4 2764 struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2765
2766 if (!s)
2767 goto out;
1da177e4
LT		 2768
2769 rc = seq_open(file, &if6_seq_ops);
2770 if (rc)
2771 goto out_kfree;
2772
2773 seq = file->private_data;
2774 seq->private = s;
2775out:
2776 return rc;
2777out_kfree:
2778 kfree(s);
2779 goto out;
2780}
2781
9a32144e 2782static const struct file_operations if6_fops = {
1da177e4
LT		 2783 .owner = THIS_MODULE,
2784 .open = if6_seq_open,
2785 .read = seq_read,
2786 .llseek = seq_lseek,
2787 .release = seq_release_private,
2788};
2789
2790int __init if6_proc_init(void)
2791{
2792 if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops))
2793 return -ENOMEM;
2794 return 0;
2795}
2796
2797void if6_proc_exit(void)
2798{
2799 proc_net_remove("if_inet6");
2800}
2801#endif /* CONFIG_PROC_FS */
2802
3b9f9a1c
NT		 2803#ifdef CONFIG_IPV6_MIP6
2804/* Check if address is a home address configured on any interface. */
2805int ipv6_chk_home_addr(struct in6_addr *addr)
2806{
2807 int ret = 0;
2808 struct inet6_ifaddr * ifp;
2809 u8 hash = ipv6_addr_hash(addr);
2810 read_lock_bh(&addrconf_hash_lock);
2811 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2812 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2813 (ifp->flags & IFA_F_HOMEADDRESS)) {
2814 ret = 1;
2815 break;
2816 }
2817 }
2818 read_unlock_bh(&addrconf_hash_lock);
2819 return ret;
2820}
2821#endif
2822
1da177e4
LT		 2823/*
2824 * Periodic address status verification
2825 */
2826
2827static void addrconf_verify(unsigned long foo)
2828{
2829 struct inet6_ifaddr *ifp;
2830 unsigned long now, next;
2831 int i;
2832
2833 spin_lock_bh(&addrconf_verify_lock);
2834 now = jiffies;
2835 next = now + ADDR_CHECK_FREQUENCY;
2836
2837 del_timer(&addr_chk_timer);
2838
2839 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2840
2841restart:
5d5780df 2842 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2843 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2844 unsigned long age;
2845#ifdef CONFIG_IPV6_PRIVACY
2846 unsigned long regen_advance;
2847#endif
2848
2849 if (ifp->flags & IFA_F_PERMANENT)
2850 continue;
2851
2852 spin_lock(&ifp->lock);
2853 age = (now - ifp->tstamp) / HZ;
2854
2855#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2856 regen_advance = ifp->idev->cnf.regen_max_retry *
2857 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2858 ifp->idev->nd_parms->retrans_time / HZ;
2859#endif
2860
8f27ebb9
YH		 2861 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2862 age >= ifp->valid_lft) {
1da177e4
LT		 2863 spin_unlock(&ifp->lock);
2864 in6_ifa_hold(ifp);
5d5780df 2865 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2866 ipv6_del_addr(ifp);
2867 goto restart;
8f27ebb9
YH		 2868 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2869 spin_unlock(&ifp->lock);
2870 continue;
1da177e4
LT		 2871 } else if (age >= ifp->prefered_lft) {
2872 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2873 int deprecate = 0;
2874
2875 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2876 deprecate = 1;
2877 ifp->flags |= IFA_F_DEPRECATED;
2878 }
2879
2880 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2881 next = ifp->tstamp + ifp->valid_lft * HZ;
2882
2883 spin_unlock(&ifp->lock);
2884
2885 if (deprecate) {
2886 in6_ifa_hold(ifp);
5d5780df 2887 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2888
2889 ipv6_ifa_notify(0, ifp);
2890 in6_ifa_put(ifp);
2891 goto restart;
2892 }
2893#ifdef CONFIG_IPV6_PRIVACY
2894 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2895 !(ifp->flags&IFA_F_TENTATIVE)) {
2896 if (age >= ifp->prefered_lft - regen_advance) {
2897 struct inet6_ifaddr *ifpub = ifp->ifpub;
2898 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2899 next = ifp->tstamp + ifp->prefered_lft * HZ;
2900 if (!ifp->regen_count && ifpub) {
2901 ifp->regen_count++;
2902 in6_ifa_hold(ifp);
2903 in6_ifa_hold(ifpub);
2904 spin_unlock(&ifp->lock);
5d5780df 2905 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2906 spin_lock(&ifpub->lock);
2907 ifpub->regen_count = 0;
2908 spin_unlock(&ifpub->lock);
1da177e4
LT		 2909 ipv6_create_tempaddr(ifpub, ifp);
2910 in6_ifa_put(ifpub);
2911 in6_ifa_put(ifp);
2912 goto restart;
2913 }
2914 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2915 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2916 spin_unlock(&ifp->lock);
2917#endif
2918 } else {
2919 /* ifp->prefered_lft <= ifp->valid_lft */
2920 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2921 next = ifp->tstamp + ifp->prefered_lft * HZ;
2922 spin_unlock(&ifp->lock);
2923 }
2924 }
5d5780df 2925 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2926 }
2927
2928 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2929 add_timer(&addr_chk_timer);
2930 spin_unlock_bh(&addrconf_verify_lock);
2931}
2932
461d8837
TG		 2933static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2934{
2935 struct in6_addr *pfx = NULL;
2936
2937 if (addr)
2938 pfx = nla_data(addr);
2939
2940 if (local) {
2941 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2942 pfx = NULL;
2943 else
2944 pfx = nla_data(local);
2945 }
2946
2947 return pfx;
2948}
2949
2950static struct nla_policy ifa_ipv6_policy[IFA_MAX+1] __read_mostly = {
2951 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2952 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2953 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2954};
2955
1da177e4
LT		 2956static int
2957inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2958{
b933f716
TG		 2959 struct ifaddrmsg *ifm;
2960 struct nlattr *tb[IFA_MAX+1];
1da177e4 2961 struct in6_addr *pfx;
b933f716 2962 int err;
1da177e4 2963
b933f716
TG		 2964 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2965 if (err < 0)
2966 return err;
2967
2968 ifm = nlmsg_data(nlh);
2969 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 2970 if (pfx == NULL)
2971 return -EINVAL;
2972
2973 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2974}
2975
55ebaef1
NT		 2976static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2977 u32 prefered_lft, u32 valid_lft)
081bba5b 2978{
46d48046
YH		 2979 u32 flags = RTF_EXPIRES;
2980
081bba5b
NT		 2981 if (!valid_lft || (prefered_lft > valid_lft))
2982 return -EINVAL;
2983
46d48046 2984 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 2985 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 2986 flags = 0;
2987 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 2988 valid_lft = 0x7FFFFFFF/HZ;
2989
2990 if (prefered_lft == 0)
55ebaef1 2991 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 2992 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
2993 (prefered_lft != INFINITY_LIFE_TIME))
2994 prefered_lft = 0x7FFFFFFF/HZ;
2995
2996 spin_lock_bh(&ifp->lock);
3b9f9a1c 2997 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 2998 ifp->tstamp = jiffies;
2999 ifp->valid_lft = valid_lft;
3000 ifp->prefered_lft = prefered_lft;
3001
3002 spin_unlock_bh(&ifp->lock);
3003 if (!(ifp->flags&IFA_F_TENTATIVE))
3004 ipv6_ifa_notify(0, ifp);
081bba5b 3005
46d48046
YH		 3006 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3007 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3008 addrconf_verify(0);
3009
3010 return 0;
3011}
3012
1da177e4
LT		 3013static int
3014inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3015{
461d8837
TG		 3016 struct ifaddrmsg *ifm;
3017 struct nlattr *tb[IFA_MAX+1];
1da177e4 3018 struct in6_addr *pfx;
7198f8ce
TG		 3019 struct inet6_ifaddr *ifa;
3020 struct net_device *dev;
55ebaef1
NT		 3021 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3022 u8 ifa_flags;
461d8837 3023 int err;
1da177e4 3024
461d8837
TG		 3025 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3026 if (err < 0)
3027 return err;
3028
3029 ifm = nlmsg_data(nlh);
3030 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3031 if (pfx == NULL)
3032 return -EINVAL;
3033
461d8837 3034 if (tb[IFA_CACHEINFO]) {
0778769d 3035 struct ifa_cacheinfo *ci;
461d8837
TG		 3036
3037 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3038 valid_lft = ci->ifa_valid;
461d8837
TG		 3039 preferred_lft = ci->ifa_prefered;
3040 } else {
3041 preferred_lft = INFINITY_LIFE_TIME;
3042 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3043 }
3044
7198f8ce
TG		 3045 dev = __dev_get_by_index(ifm->ifa_index);
3046 if (dev == NULL)
3047 return -ENODEV;
3048
55ebaef1 3049 /* We ignore other flags so far. */
3b9f9a1c 3050 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3051
7198f8ce
TG		 3052 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3053 if (ifa == NULL) {
3054 /*
3055 * It would be best to check for !NLM_F_CREATE here but
3056 * userspace alreay relies on not having to provide this.
3057 */
3058 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3059 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3060 }
3061
7198f8ce
TG		 3062 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3063 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3064 err = -EEXIST;
3065 else
55ebaef1 3066 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3067
3068 in6_ifa_put(ifa);
3069
3070 return err;
1da177e4
LT		 3071}
3072
101bb229
TG		 3073static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3074 u8 scope, int ifindex)
3075{
3076 struct ifaddrmsg *ifm;
3077
3078 ifm = nlmsg_data(nlh);
3079 ifm->ifa_family = AF_INET6;
3080 ifm->ifa_prefixlen = prefixlen;
3081 ifm->ifa_flags = flags;
3082 ifm->ifa_scope = scope;
3083 ifm->ifa_index = ifindex;
3084}
3085
85486af0
TG		 3086static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3087 unsigned long tstamp, u32 preferred, u32 valid)
3088{
3089 struct ifa_cacheinfo ci;
3090
3091 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3092 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3093 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3094 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3095 ci.ifa_prefered = preferred;
3096 ci.ifa_valid = valid;
3097
3098 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3099}
3100
101bb229
TG		 3101static inline int rt_scope(int ifa_scope)
3102{
3103 if (ifa_scope & IFA_HOST)
3104 return RT_SCOPE_HOST;
3105 else if (ifa_scope & IFA_LINK)
3106 return RT_SCOPE_LINK;
3107 else if (ifa_scope & IFA_SITE)
3108 return RT_SCOPE_SITE;
3109 else
3110 return RT_SCOPE_UNIVERSE;
3111}
3112
0ab6803b
TG		 3113static inline int inet6_ifaddr_msgsize(void)
3114{
339bf98f
TG		 3115 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3116 + nla_total_size(16) /* IFA_ADDRESS */
3117 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3118}
c5396a31 3119
1da177e4 3120static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3121 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3122{
1da177e4 3123 struct nlmsghdr *nlh;
85486af0 3124 u32 preferred, valid;
1da177e4 3125
0ab6803b
TG		 3126 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3127 if (nlh == NULL)
26932566 3128 return -EMSGSIZE;
0ab6803b 3129
101bb229
TG		 3130 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3131 ifa->idev->dev->ifindex);
3132
1da177e4 3133 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3134 preferred = ifa->prefered_lft;
3135 valid = ifa->valid_lft;
3136 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3137 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3138 preferred -= tval;
3139 if (valid != INFINITY_LIFE_TIME)
3140 valid -= tval;
1da177e4
LT		 3141 }
3142 } else {
85486af0
TG		 3143 preferred = INFINITY_LIFE_TIME;
3144 valid = INFINITY_LIFE_TIME;
3145 }
3146
0ab6803b 3147 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3148 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3149 nlmsg_cancel(skb, nlh);
3150 return -EMSGSIZE;
3151 }
1da177e4 3152
0ab6803b 3153 return nlmsg_end(skb, nlh);
1da177e4
LT		 3154}
3155
3156static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3157 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3158{
1da177e4 3159 struct nlmsghdr *nlh;
101bb229
TG		 3160 u8 scope = RT_SCOPE_UNIVERSE;
3161 int ifindex = ifmca->idev->dev->ifindex;
3162
3163 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3164 scope = RT_SCOPE_SITE;
1da177e4 3165
0ab6803b
TG		 3166 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3167 if (nlh == NULL)
26932566 3168 return -EMSGSIZE;
85486af0 3169
0ab6803b
TG		 3170 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3171 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3172 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3173 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3174 nlmsg_cancel(skb, nlh);
3175 return -EMSGSIZE;
3176 }
85486af0 3177
0ab6803b 3178 return nlmsg_end(skb, nlh);
1da177e4
LT		 3179}
3180
3181static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3182 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3183{
1da177e4 3184 struct nlmsghdr *nlh;
101bb229
TG		 3185 u8 scope = RT_SCOPE_UNIVERSE;
3186 int ifindex = ifaca->aca_idev->dev->ifindex;
3187
3188 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3189 scope = RT_SCOPE_SITE;
1da177e4 3190
0ab6803b
TG		 3191 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3192 if (nlh == NULL)
26932566 3193 return -EMSGSIZE;
85486af0 3194
0ab6803b
TG		 3195 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3196 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3197 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3198 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3199 nlmsg_cancel(skb, nlh);
3200 return -EMSGSIZE;
3201 }
1da177e4 3202
0ab6803b 3203 return nlmsg_end(skb, nlh);
1da177e4
LT		 3204}
3205
3206enum addr_type_t
3207{
3208 UNICAST_ADDR,
3209 MULTICAST_ADDR,
3210 ANYCAST_ADDR,
3211};
3212
3213static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3214 enum addr_type_t type)
3215{
3216 int idx, ip_idx;
3217 int s_idx, s_ip_idx;
3218 int err = 1;
3219 struct net_device *dev;
3220 struct inet6_dev *idev = NULL;
3221 struct inet6_ifaddr *ifa;
3222 struct ifmcaddr6 *ifmca;
3223 struct ifacaddr6 *ifaca;
3224
3225 s_idx = cb->args[0];
3226 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3227
1da177e4
LT		 3228 for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) {
3229 if (idx < s_idx)
3230 continue;
3231 if (idx > s_idx)
3232 s_ip_idx = 0;
3233 ip_idx = 0;
3234 if ((idev = in6_dev_get(dev)) == NULL)
3235 continue;
3236 read_lock_bh(&idev->lock);
3237 switch (type) {
3238 case UNICAST_ADDR:
ae9cda5d 3239 /* unicast address incl. temp addr */
1da177e4
LT		 3240 for (ifa = idev->addr_list; ifa;
3241 ifa = ifa->if_next, ip_idx++) {
3242 if (ip_idx < s_ip_idx)
3243 continue;
1ab1457c
YH		 3244 if ((err = inet6_fill_ifaddr(skb, ifa,
3245 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3246 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3247 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3248 goto done;
3249 }
1da177e4
LT		 3250 break;
3251 case MULTICAST_ADDR:
3252 /* multicast address */
1ab1457c 3253 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3254 ifmca = ifmca->next, ip_idx++) {
3255 if (ip_idx < s_ip_idx)
3256 continue;
1ab1457c
YH		 3257 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3258 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3259 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3260 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3261 goto done;
3262 }
3263 break;
3264 case ANYCAST_ADDR:
3265 /* anycast address */
3266 for (ifaca = idev->ac_list; ifaca;
3267 ifaca = ifaca->aca_next, ip_idx++) {
3268 if (ip_idx < s_ip_idx)
3269 continue;
1ab1457c
YH		 3270 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3271 NETLINK_CB(cb->skb).pid,
b6544c0b 3272 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3273 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3274 goto done;
3275 }
3276 break;
3277 default:
3278 break;
3279 }
3280 read_unlock_bh(&idev->lock);
3281 in6_dev_put(idev);
3282 }
3283done:
3284 if (err <= 0) {
3285 read_unlock_bh(&idev->lock);
3286 in6_dev_put(idev);
3287 }
1da177e4
LT		 3288 cb->args[0] = idx;
3289 cb->args[1] = ip_idx;
3290 return skb->len;
3291}
3292
3293static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3294{
3295 enum addr_type_t type = UNICAST_ADDR;
3296 return inet6_dump_addr(skb, cb, type);
3297}
3298
3299static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3300{
3301 enum addr_type_t type = MULTICAST_ADDR;
3302 return inet6_dump_addr(skb, cb, type);
3303}
3304
3305
3306static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3307{
3308 enum addr_type_t type = ANYCAST_ADDR;
3309 return inet6_dump_addr(skb, cb, type);
3310}
3311
1b29fc2c
TG		 3312static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3313 void *arg)
6c223828 3314{
1b29fc2c
TG		 3315 struct ifaddrmsg *ifm;
3316 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3317 struct in6_addr *addr = NULL;
3318 struct net_device *dev = NULL;
3319 struct inet6_ifaddr *ifa;
3320 struct sk_buff *skb;
6c223828
NT		 3321 int err;
3322
1b29fc2c
TG		 3323 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3324 if (err < 0)
3325 goto errout;
3326
3327 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3328 if (addr == NULL) {
3329 err = -EINVAL;
3330 goto errout;
6c223828 3331 }
6c223828 3332
1b29fc2c 3333 ifm = nlmsg_data(nlh);
6c223828
NT		 3334 if (ifm->ifa_index)
3335 dev = __dev_get_by_index(ifm->ifa_index);
3336
1b29fc2c
TG		 3337 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3338 err = -EADDRNOTAVAIL;
3339 goto errout;
3340 }
6c223828 3341
0ab6803b 3342 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3343 err = -ENOBUFS;
1b29fc2c 3344 goto errout_ifa;
6c223828
NT		 3345 }
3346
6c223828
NT		 3347 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3348 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3349 if (err < 0) {
3350 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3351 WARN_ON(err == -EMSGSIZE);
3352 kfree_skb(skb);
3353 goto errout_ifa;
3354 }
2942e900 3355 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3356errout_ifa:
6c223828 3357 in6_ifa_put(ifa);
1b29fc2c 3358errout:
6c223828 3359 return err;
6c223828
NT		 3360}
3361
1da177e4
LT		 3362static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3363{
3364 struct sk_buff *skb;
5d620266 3365 int err = -ENOBUFS;
1da177e4 3366
0ab6803b 3367 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3368 if (skb == NULL)
3369 goto errout;
3370
3371 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3372 if (err < 0) {
3373 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3374 WARN_ON(err == -EMSGSIZE);
3375 kfree_skb(skb);
3376 goto errout;
3377 }
5d620266
TG		 3378 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3379errout:
3380 if (err < 0)
3381 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3382}
3383
b6f99a21 3384static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3385 __s32 *array, int bytes)
3386{
04561c1f
TG		 3387 BUG_ON(bytes < (DEVCONF_MAX * 4));
3388
1da177e4
LT		 3389 memset(array, 0, bytes);
3390 array[DEVCONF_FORWARDING] = cnf->forwarding;
3391 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3392 array[DEVCONF_MTU6] = cnf->mtu6;
3393 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3394 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3395 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3396 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3397 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3398 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3399 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3400 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3401#ifdef CONFIG_IPV6_PRIVACY
3402 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3403 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3404 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3405 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3406 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3407#endif
3408 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3409 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3410 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3411#ifdef CONFIG_IPV6_ROUTER_PREF
3412 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3413 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3414#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3415 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3416#endif
930d6ff2 3417#endif
fbea49e1 3418 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3419 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3420#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3421 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3422#endif
1da177e4
LT		 3423}
3424
339bf98f
TG		 3425static inline size_t inet6_if_nlmsg_size(void)
3426{
3427 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3428 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3429 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3430 + nla_total_size(4) /* IFLA_MTU */
3431 + nla_total_size(4) /* IFLA_LINK */
3432 + nla_total_size( /* IFLA_PROTINFO */
3433 nla_total_size(4) /* IFLA_INET6_FLAGS */
3434 + nla_total_size(sizeof(struct ifla_cacheinfo))
3435 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3436 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3437 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3438 );
3439}
c5396a31 3440
1ab1457c 3441static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3442 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3443{
04561c1f 3444 struct net_device *dev = idev->dev;
bf99f1bd 3445 struct nlattr *nla;
04561c1f
TG		 3446 struct ifinfomsg *hdr;
3447 struct nlmsghdr *nlh;
3448 void *protoinfo;
3449 struct ifla_cacheinfo ci;
3450
3451 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3452 if (nlh == NULL)
26932566 3453 return -EMSGSIZE;
04561c1f
TG		 3454
3455 hdr = nlmsg_data(nlh);
3456 hdr->ifi_family = AF_INET6;
3457 hdr->__ifi_pad = 0;
3458 hdr->ifi_type = dev->type;
3459 hdr->ifi_index = dev->ifindex;
3460 hdr->ifi_flags = dev_get_flags(dev);
3461 hdr->ifi_change = 0;
3462
3463 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3464
3465 if (dev->addr_len)
04561c1f 3466 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3467
04561c1f 3468 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3469 if (dev->ifindex != dev->iflink)
04561c1f 3470 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3471
04561c1f
TG		 3472 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3473 if (protoinfo == NULL)
3474 goto nla_put_failure;
1da177e4 3475
04561c1f 3476 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3477
1da177e4
LT		 3478 ci.max_reasm_len = IPV6_MAXPLEN;
3479 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3480 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3481 ci.reachable_time = idev->nd_parms->reachable_time;
3482 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3483 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3484
bf99f1bd
YH		 3485 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3486 if (nla == NULL)
04561c1f 3487 goto nla_put_failure;
bf99f1bd 3488 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3489
bf99f1bd
YH		 3490 /* XXX - MC not implemented */
3491
3492 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3493 if (nla == NULL)
3494 goto nla_put_failure;
3495 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3496
3497 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3498 if (nla == NULL)
3499 goto nla_put_failure;
3500 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3501
04561c1f
TG		 3502 nla_nest_end(skb, protoinfo);
3503 return nlmsg_end(skb, nlh);
1da177e4 3504
04561c1f 3505nla_put_failure:
26932566
PM		 3506 nlmsg_cancel(skb, nlh);
3507 return -EMSGSIZE;
1da177e4
LT		 3508}
3509
3510static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3511{
3512 int idx, err;
3513 int s_idx = cb->args[0];
3514 struct net_device *dev;
3515 struct inet6_dev *idev;
3516
3517 read_lock(&dev_base_lock);
3518 for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) {
3519 if (idx < s_idx)
3520 continue;
3521 if ((idev = in6_dev_get(dev)) == NULL)
3522 continue;
1ab1457c 3523 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3524 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3525 in6_dev_put(idev);
3526 if (err <= 0)
3527 break;
3528 }
3529 read_unlock(&dev_base_lock);
3530 cb->args[0] = idx;
3531
3532 return skb->len;
3533}
3534
3535void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3536{
3537 struct sk_buff *skb;
8d7a76c9 3538 int err = -ENOBUFS;
1ab1457c 3539
339bf98f 3540 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3541 if (skb == NULL)
3542 goto errout;
3543
3544 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3545 if (err < 0) {
3546 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3547 WARN_ON(err == -EMSGSIZE);
3548 kfree_skb(skb);
3549 goto errout;
3550 }
8d7a76c9
TG		 3551 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3552errout:
3553 if (err < 0)
3554 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3555}
3556
339bf98f
TG		 3557static inline size_t inet6_prefix_nlmsg_size(void)
3558{
3559 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3560 + nla_total_size(sizeof(struct in6_addr))
3561 + nla_total_size(sizeof(struct prefix_cacheinfo));
3562}
c5396a31 3563
1da177e4 3564static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3565 struct prefix_info *pinfo, u32 pid, u32 seq,
3566 int event, unsigned int flags)
1da177e4 3567{
6051e2f4
TG		 3568 struct prefixmsg *pmsg;
3569 struct nlmsghdr *nlh;
1da177e4
LT		 3570 struct prefix_cacheinfo ci;
3571
6051e2f4
TG		 3572 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3573 if (nlh == NULL)
26932566 3574 return -EMSGSIZE;
6051e2f4
TG		 3575
3576 pmsg = nlmsg_data(nlh);
1da177e4 3577 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3578 pmsg->prefix_pad1 = 0;
3579 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3580 pmsg->prefix_ifindex = idev->dev->ifindex;
3581 pmsg->prefix_len = pinfo->prefix_len;
3582 pmsg->prefix_type = pinfo->type;
8a47077a 3583 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3584 pmsg->prefix_flags = 0;
3585 if (pinfo->onlink)
3586 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3587 if (pinfo->autoconf)
3588 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3589
6051e2f4 3590 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3591
3592 ci.preferred_time = ntohl(pinfo->prefered);
3593 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3594 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3595
6051e2f4 3596 return nlmsg_end(skb, nlh);
1da177e4 3597
6051e2f4 3598nla_put_failure:
26932566
PM		 3599 nlmsg_cancel(skb, nlh);
3600 return -EMSGSIZE;
1da177e4
LT		 3601}
3602
1ab1457c 3603static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3604 struct prefix_info *pinfo)
3605{
3606 struct sk_buff *skb;
8c384bfa 3607 int err = -ENOBUFS;
1da177e4 3608
339bf98f 3609 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3610 if (skb == NULL)
3611 goto errout;
3612
3613 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3614 if (err < 0) {
3615 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3616 WARN_ON(err == -EMSGSIZE);
3617 kfree_skb(skb);
3618 goto errout;
3619 }
8c384bfa
TG		 3620 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3621errout:
3622 if (err < 0)
3623 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3624}
3625
1da177e4
LT		 3626static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3627{
3628 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3629
3630 switch (event) {
3631 case RTM_NEWADDR:
95c385b4
NH		 3632 /*
3633 * If the address was optimistic
3634 * we inserted the route at the start of
3635 * our DAD process, so we don't need
3636 * to do it again
3637 */
3638 if (!(ifp->rt->rt6i_node))
3639 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3640 if (ifp->idev->cnf.forwarding)
3641 addrconf_join_anycast(ifp);
3642 break;
3643 case RTM_DELADDR:
3644 if (ifp->idev->cnf.forwarding)
3645 addrconf_leave_anycast(ifp);
3646 addrconf_leave_solict(ifp->idev, &ifp->addr);
3647 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3648 if (ip6_del_rt(ifp->rt))
1da177e4 3649 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3650 break;
3651 }
3652}
3653
3654static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3655{
8814c4b5 3656 rcu_read_lock_bh();
1da177e4
LT		 3657 if (likely(ifp->idev->dead == 0))
3658 __ipv6_ifa_notify(event, ifp);
8814c4b5 3659 rcu_read_unlock_bh();
1da177e4
LT		 3660}
3661
3662#ifdef CONFIG_SYSCTL
3663
3664static
3665int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3666 void __user *buffer, size_t *lenp, loff_t *ppos)
3667{
3668 int *valp = ctl->data;
3669 int val = *valp;
3670 int ret;
3671
3672 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3673
3674 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3675 if (valp != &ipv6_devconf.forwarding) {
3676 if ((!*valp) ^ (!val)) {
3677 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3678 if (idev == NULL)
3679 return ret;
3680 dev_forward_change(idev);
3681 }
3682 } else {
3683 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3684 addrconf_forward_change();
3685 }
3686 if (*valp)
3687 rt6_purge_dflt_routers();
3688 }
3689
1ab1457c 3690 return ret;
1da177e4
LT		 3691}
3692
1ab1457c 3693static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3694 int __user *name, int nlen,
3695 void __user *oldval,
3696 size_t __user *oldlenp,
1f29bcd7 3697 void __user *newval, size_t newlen)
1da177e4
LT		 3698{
3699 int *valp = table->data;
3700 int new;
3701
3702 if (!newval || !newlen)
3703 return 0;
3704 if (newlen != sizeof(int))
3705 return -EINVAL;
3706 if (get_user(new, (int __user *)newval))
3707 return -EFAULT;
3708 if (new == *valp)
3709 return 0;
3710 if (oldval && oldlenp) {
3711 size_t len;
3712 if (get_user(len, oldlenp))
3713 return -EFAULT;
3714 if (len) {
3715 if (len > table->maxlen)
3716 len = table->maxlen;
3717 if (copy_to_user(oldval, valp, len))
3718 return -EFAULT;
3719 if (put_user(len, oldlenp))
3720 return -EFAULT;
3721 }
3722 }
3723
3724 if (valp != &ipv6_devconf_dflt.forwarding) {
3725 if (valp != &ipv6_devconf.forwarding) {
3726 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3727 int changed;
3728 if (unlikely(idev == NULL))
3729 return -ENODEV;
3730 changed = (!*valp) ^ (!new);
3731 *valp = new;
3732 if (changed)
3733 dev_forward_change(idev);
3734 } else {
3735 *valp = new;
3736 addrconf_forward_change();
3737 }
3738
3739 if (*valp)
3740 rt6_purge_dflt_routers();
3741 } else
3742 *valp = new;
3743
3744 return 1;
3745}
3746
3747static struct addrconf_sysctl_table
3748{
3749 struct ctl_table_header *sysctl_header;
3750 ctl_table addrconf_vars[__NET_IPV6_MAX];
3751 ctl_table addrconf_dev[2];
3752 ctl_table addrconf_conf_dir[2];
3753 ctl_table addrconf_proto_dir[2];
3754 ctl_table addrconf_root_dir[2];
ab32ea5d 3755} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3756 .sysctl_header = NULL,
3757 .addrconf_vars = {
1ab1457c 3758 {
1da177e4
LT		 3759 .ctl_name = NET_IPV6_FORWARDING,
3760 .procname = "forwarding",
1ab1457c 3761 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3762 .maxlen = sizeof(int),
3763 .mode = 0644,
1ab1457c 3764 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3765 .strategy = &addrconf_sysctl_forward_strategy,
3766 },
3767 {
3768 .ctl_name = NET_IPV6_HOP_LIMIT,
3769 .procname = "hop_limit",
1ab1457c 3770 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3771 .maxlen = sizeof(int),
3772 .mode = 0644,
3773 .proc_handler = proc_dointvec,
3774 },
3775 {
3776 .ctl_name = NET_IPV6_MTU,
3777 .procname = "mtu",
3778 .data = &ipv6_devconf.mtu6,
1ab1457c 3779 .maxlen = sizeof(int),
1da177e4 3780 .mode = 0644,
1ab1457c 3781 .proc_handler = &proc_dointvec,
1da177e4
LT		 3782 },
3783 {
3784 .ctl_name = NET_IPV6_ACCEPT_RA,
3785 .procname = "accept_ra",
1ab1457c 3786 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3787 .maxlen = sizeof(int),
3788 .mode = 0644,
1ab1457c 3789 .proc_handler = &proc_dointvec,
1da177e4
LT		 3790 },
3791 {
3792 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3793 .procname = "accept_redirects",
1ab1457c 3794 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3795 .maxlen = sizeof(int),
3796 .mode = 0644,
1ab1457c 3797 .proc_handler = &proc_dointvec,
1da177e4
LT		 3798 },
3799 {
3800 .ctl_name = NET_IPV6_AUTOCONF,
3801 .procname = "autoconf",
1ab1457c 3802 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3803 .maxlen = sizeof(int),
3804 .mode = 0644,
1ab1457c 3805 .proc_handler = &proc_dointvec,
1da177e4
LT		 3806 },
3807 {
3808 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3809 .procname = "dad_transmits",
1ab1457c 3810 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3811 .maxlen = sizeof(int),
3812 .mode = 0644,
1ab1457c 3813 .proc_handler = &proc_dointvec,
1da177e4
LT		 3814 },
3815 {
3816 .ctl_name = NET_IPV6_RTR_SOLICITS,
3817 .procname = "router_solicitations",
1ab1457c 3818 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3819 .maxlen = sizeof(int),
3820 .mode = 0644,
1ab1457c 3821 .proc_handler = &proc_dointvec,
1da177e4
LT		 3822 },
3823 {
3824 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3825 .procname = "router_solicitation_interval",
1ab1457c 3826 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3827 .maxlen = sizeof(int),
3828 .mode = 0644,
1ab1457c 3829 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3830 .strategy = &sysctl_jiffies,
3831 },
3832 {
3833 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3834 .procname = "router_solicitation_delay",
1ab1457c 3835 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3836 .maxlen = sizeof(int),
3837 .mode = 0644,
1ab1457c 3838 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3839 .strategy = &sysctl_jiffies,
3840 },
3841 {
3842 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3843 .procname = "force_mld_version",
1ab1457c 3844 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3845 .maxlen = sizeof(int),
3846 .mode = 0644,
1ab1457c 3847 .proc_handler = &proc_dointvec,
1da177e4
LT		 3848 },
3849#ifdef CONFIG_IPV6_PRIVACY
3850 {
3851 .ctl_name = NET_IPV6_USE_TEMPADDR,
3852 .procname = "use_tempaddr",
1ab1457c 3853 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3854 .maxlen = sizeof(int),
3855 .mode = 0644,
1ab1457c 3856 .proc_handler = &proc_dointvec,
1da177e4
LT		 3857 },
3858 {
3859 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3860 .procname = "temp_valid_lft",
1ab1457c 3861 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3862 .maxlen = sizeof(int),
3863 .mode = 0644,
1ab1457c 3864 .proc_handler = &proc_dointvec,
1da177e4
LT		 3865 },
3866 {
3867 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3868 .procname = "temp_prefered_lft",
1ab1457c 3869 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3870 .maxlen = sizeof(int),
3871 .mode = 0644,
1ab1457c 3872 .proc_handler = &proc_dointvec,
1da177e4
LT		 3873 },
3874 {
3875 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3876 .procname = "regen_max_retry",
1ab1457c 3877 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3878 .maxlen = sizeof(int),
3879 .mode = 0644,
1ab1457c 3880 .proc_handler = &proc_dointvec,
1da177e4
LT		 3881 },
3882 {
3883 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3884 .procname = "max_desync_factor",
1ab1457c 3885 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3886 .maxlen = sizeof(int),
3887 .mode = 0644,
1ab1457c 3888 .proc_handler = &proc_dointvec,
1da177e4
LT		 3889 },
3890#endif
3891 {
3892 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3893 .procname = "max_addresses",
3894 .data = &ipv6_devconf.max_addresses,
3895 .maxlen = sizeof(int),
3896 .mode = 0644,
3897 .proc_handler = &proc_dointvec,
3898 },
65f5c7c1
YH		 3899 {
3900 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3901 .procname = "accept_ra_defrtr",
1ab1457c 3902 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3903 .maxlen = sizeof(int),
3904 .mode = 0644,
1ab1457c 3905 .proc_handler = &proc_dointvec,
65f5c7c1 3906 },
c4fd30eb
YH		 3907 {
3908 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3909 .procname = "accept_ra_pinfo",
1ab1457c 3910 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3911 .maxlen = sizeof(int),
3912 .mode = 0644,
1ab1457c 3913 .proc_handler = &proc_dointvec,
c4fd30eb 3914 },
930d6ff2
YH		 3915#ifdef CONFIG_IPV6_ROUTER_PREF
3916 {
3917 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3918 .procname = "accept_ra_rtr_pref",
3919 .data = &ipv6_devconf.accept_ra_rtr_pref,
3920 .maxlen = sizeof(int),
3921 .mode = 0644,
3922 .proc_handler = &proc_dointvec,
3923 },
52e16356
YH		 3924 {
3925 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3926 .procname = "router_probe_interval",
3927 .data = &ipv6_devconf.rtr_probe_interval,
3928 .maxlen = sizeof(int),
3929 .mode = 0644,
3930 .proc_handler = &proc_dointvec_jiffies,
3931 .strategy = &sysctl_jiffies,
3932 },
fa03ef38 3933#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3934 {
3935 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3936 .procname = "accept_ra_rt_info_max_plen",
3937 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3938 .maxlen = sizeof(int),
3939 .mode = 0644,
3940 .proc_handler = &proc_dointvec,
3941 },
3942#endif
930d6ff2 3943#endif
fbea49e1
YH		 3944 {
3945 .ctl_name = NET_IPV6_PROXY_NDP,
3946 .procname = "proxy_ndp",
3947 .data = &ipv6_devconf.proxy_ndp,
3948 .maxlen = sizeof(int),
3949 .mode = 0644,
3950 .proc_handler = &proc_dointvec,
3951 },
0bcbc926
YH		 3952 {
3953 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
3954 .procname = "accept_source_route",
3955 .data = &ipv6_devconf.accept_source_route,
3956 .maxlen = sizeof(int),
3957 .mode = 0644,
3958 .proc_handler = &proc_dointvec,
3959 },
95c385b4
NH		 3960#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3961 {
3962 .ctl_name = CTL_UNNUMBERED,
3963 .procname = "optimistic_dad",
3964 .data = &ipv6_devconf.optimistic_dad,
3965 .maxlen = sizeof(int),
3966 .mode = 0644,
3967 .proc_handler = &proc_dointvec,
3968
3969 },
3970#endif
1da177e4
LT		 3971 {
3972 .ctl_name = 0, /* sentinel */
3973 }
3974 },
3975 .addrconf_dev = {
3976 {
3977 .ctl_name = NET_PROTO_CONF_ALL,
3978 .procname = "all",
3979 .mode = 0555,
3980 .child = addrconf_sysctl.addrconf_vars,
3981 },
3982 {
3983 .ctl_name = 0, /* sentinel */
3984 }
3985 },
3986 .addrconf_conf_dir = {
3987 {
3988 .ctl_name = NET_IPV6_CONF,
3989 .procname = "conf",
3990 .mode = 0555,
3991 .child = addrconf_sysctl.addrconf_dev,
3992 },
3993 {
3994 .ctl_name = 0, /* sentinel */
3995 }
3996 },
3997 .addrconf_proto_dir = {
3998 {
3999 .ctl_name = NET_IPV6,
4000 .procname = "ipv6",
4001 .mode = 0555,
4002 .child = addrconf_sysctl.addrconf_conf_dir,
4003 },
4004 {
4005 .ctl_name = 0, /* sentinel */
4006 }
4007 },
4008 .addrconf_root_dir = {
4009 {
4010 .ctl_name = CTL_NET,
4011 .procname = "net",
4012 .mode = 0555,
4013 .child = addrconf_sysctl.addrconf_proto_dir,
4014 },
4015 {
4016 .ctl_name = 0, /* sentinel */
4017 }
4018 },
4019};
4020
4021static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4022{
4023 int i;
4024 struct net_device *dev = idev ? idev->dev : NULL;
4025 struct addrconf_sysctl_table *t;
4026 char *dev_name = NULL;
4027
af879cc7 4028 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4029 if (t == NULL)
4030 return;
1da177e4
LT		 4031 for (i=0; t->addrconf_vars[i].data; i++) {
4032 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4033 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4034 }
4035 if (dev) {
1ab1457c 4036 dev_name = dev->name;
1da177e4
LT		 4037 t->addrconf_dev[0].ctl_name = dev->ifindex;
4038 } else {
4039 dev_name = "default";
4040 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4041 }
4042
1ab1457c
YH		 4043 /*
4044 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4045 * by sysctl and we wouldn't want anyone to change it under our feet
4046 * (see SIOCSIFNAME).
1ab1457c 4047 */
543537bd 4048 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4049 if (!dev_name)
4050 goto free;
4051
4052 t->addrconf_dev[0].procname = dev_name;
4053
4054 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4055 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4056 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4057 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4058
0b4d4147 4059 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4060 if (t->sysctl_header == NULL)
4061 goto free_procname;
4062 else
4063 p->sysctl = t;
4064 return;
4065
4066 /* error path */
4067 free_procname:
4068 kfree(dev_name);
4069 free:
4070 kfree(t);
4071
4072 return;
4073}
4074
4075static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4076{
4077 if (p->sysctl) {
4078 struct addrconf_sysctl_table *t = p->sysctl;
4079 p->sysctl = NULL;
4080 unregister_sysctl_table(t->sysctl_header);
4081 kfree(t->addrconf_dev[0].procname);
4082 kfree(t);
4083 }
4084}
4085
4086
4087#endif
4088
4089/*
4090 * Device notifier
4091 */
4092
4093int register_inet6addr_notifier(struct notifier_block *nb)
4094{
1ab1457c 4095 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4096}
4097
7159039a
YH		 4098EXPORT_SYMBOL(register_inet6addr_notifier);
4099
1da177e4
LT		 4100int unregister_inet6addr_notifier(struct notifier_block *nb)
4101{
1ab1457c 4102 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4103}
4104
7159039a
YH		 4105EXPORT_SYMBOL(unregister_inet6addr_notifier);
4106
1da177e4
LT		 4107/*
4108 * Init / cleanup code
4109 */
4110
4111int __init addrconf_init(void)
4112{
4113 int err = 0;
4114
4115 /* The addrconf netdev notifier requires that loopback_dev
4116 * has it's ipv6 private information allocated and setup
4117 * before it can bring up and give link-local addresses
4118 * to other devices which are up.
4119 *
4120 * Unfortunately, loopback_dev is not necessarily the first
4121 * entry in the global dev_base list of net devices. In fact,
4122 * it is likely to be the very last entry on that list.
4123 * So this causes the notifier registry below to try and
4124 * give link-local addresses to all devices besides loopback_dev
4125 * first, then loopback_dev, which cases all the non-loopback_dev
4126 * devices to fail to get a link-local address.
4127 *
4128 * So, as a temporary fix, allocate the ipv6 structure for
4129 * loopback_dev first by hand.
4130 * Longer term, all of the dependencies ipv6 has upon the loopback
4131 * device and it being up should be removed.
4132 */
4133 rtnl_lock();
4134 if (!ipv6_add_dev(&loopback_dev))
4135 err = -ENOMEM;
4136 rtnl_unlock();
4137 if (err)
4138 return err;
4139
c62dba90
HX		 4140 ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev);
4141
1da177e4
LT		 4142 register_netdevice_notifier(&ipv6_dev_notf);
4143
1da177e4 4144 addrconf_verify(0);
c127ea2c
TG		 4145
4146 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4147 if (err < 0)
4148 goto errout;
4149
4150 /* Only the first call to __rtnl_register can fail */
4151 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4152 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4153 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4154 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4155 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4156
1da177e4
LT		 4157#ifdef CONFIG_SYSCTL
4158 addrconf_sysctl.sysctl_header =
0b4d4147 4159 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4160 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4161#endif
4162
4163 return 0;
c127ea2c
TG		 4164errout:
4165 unregister_netdevice_notifier(&ipv6_dev_notf);
4166
4167 return err;
1da177e4
LT		 4168}
4169
4170void __exit addrconf_cleanup(void)
4171{
1ab1457c
YH		 4172 struct net_device *dev;
4173 struct inet6_dev *idev;
4174 struct inet6_ifaddr *ifa;
1da177e4
LT		 4175 int i;
4176
4177 unregister_netdevice_notifier(&ipv6_dev_notf);
4178
1da177e4
LT		 4179#ifdef CONFIG_SYSCTL
4180 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4181 addrconf_sysctl_unregister(&ipv6_devconf);
4182#endif
4183
4184 rtnl_lock();
4185
4186 /*
4187 * clean dev list.
4188 */
4189
4190 for (dev=dev_base; dev; dev=dev->next) {
4191 if ((idev = __in6_dev_get(dev)) == NULL)
4192 continue;
4193 addrconf_ifdown(dev, 1);
4194 }
4195 addrconf_ifdown(&loopback_dev, 2);
4196
4197 /*
4198 * Check hash table.
4199 */
4200
4201 write_lock_bh(&addrconf_hash_lock);
4202 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4203 for (ifa=inet6_addr_lst[i]; ifa; ) {
4204 struct inet6_ifaddr *bifa;
4205
4206 bifa = ifa;
4207 ifa = ifa->lst_next;
4208 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4209 /* Do not free it; something is wrong.
4210 Now we can investigate it with debugger.
4211 */
4212 }
4213 }
4214 write_unlock_bh(&addrconf_hash_lock);
4215
4216 del_timer(&addr_chk_timer);
4217
4218 rtnl_unlock();
4219
1da177e4
LT		 4220#ifdef CONFIG_PROC_FS
4221 proc_net_remove("if_inet6");
4222#endif
4223}
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