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[IPV6]: Fix return type for snmp6_free_dev()
[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 64
457c4cbc 65#include <net/net_namespace.h>
1da177e4
LT		 66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
5d620266 76#include <net/netlink.h>
f24e3d65 77#include <net/pkt_sched.h>
1da177e4
LT		 78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
1da177e4
LT		 83#endif
84
85#include <asm/uaccess.h>
7f7d9a6b 86#include <asm/unaligned.h>
1da177e4
LT		 87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101#define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102
103#ifdef CONFIG_SYSCTL
104static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p);
105static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
106#endif
107
108#ifdef CONFIG_IPV6_PRIVACY
109static int __ipv6_regen_rndid(struct inet6_dev *idev);
1ab1457c 110static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
1da177e4
LT		 111static void ipv6_regen_rndid(unsigned long data);
112
113static int desync_factor = MAX_DESYNC_FACTOR * HZ;
1da177e4
LT		 114#endif
115
116static int ipv6_count_addresses(struct inet6_dev *idev);
117
118/*
119 * Configured unicast address hash table
120 */
121static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122static DEFINE_RWLOCK(addrconf_hash_lock);
123
1da177e4
LT		 124static void addrconf_verify(unsigned long);
125
8d06afab 126static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
1da177e4
LT		 127static DEFINE_SPINLOCK(addrconf_verify_lock);
128
129static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
131
132static int addrconf_ifdown(struct net_device *dev, int how);
133
e431b8c0 134static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
1da177e4
LT		 135static void addrconf_dad_timer(unsigned long data);
136static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
c5e33bdd 137static void addrconf_dad_run(struct inet6_dev *idev);
1da177e4
LT		 138static void addrconf_rs_timer(unsigned long data);
139static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
141
1ab1457c 142static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 143 struct prefix_info *pinfo);
144static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
145
e041c683 146static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
1da177e4 147
ab32ea5d 148struct ipv6_devconf ipv6_devconf __read_mostly = {
1da177e4
LT		 149 .forwarding = 0,
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
152 .accept_ra = 1,
153 .accept_redirects = 1,
154 .autoconf = 1,
155 .force_mld_version = 0,
156 .dad_transmits = 1,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160#ifdef CONFIG_IPV6_PRIVACY
161 .use_tempaddr = 0,
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
166#endif
167 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 168 .accept_ra_defrtr = 1,
c4fd30eb 169 .accept_ra_pinfo = 1,
930d6ff2
YH		 170#ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
52e16356 172 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 173#ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
175#endif
930d6ff2 176#endif
fbea49e1 177 .proxy_ndp = 0,
0bcbc926 178 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 179};
180
ab32ea5d 181static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
1da177e4
LT		 182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .dad_transmits = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192#ifdef CONFIG_IPV6_PRIVACY
193 .use_tempaddr = 0,
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
198#endif
199 .max_addresses = IPV6_MAX_ADDRESSES,
65f5c7c1 200 .accept_ra_defrtr = 1,
c4fd30eb 201 .accept_ra_pinfo = 1,
930d6ff2
YH		 202#ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
52e16356 204 .rtr_probe_interval = 60 * HZ,
09c884d4
YH		 205#ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
207#endif
930d6ff2 208#endif
fbea49e1 209 .proxy_ndp = 0,
0bcbc926 210 .accept_source_route = 0, /* we do not accept RH0 by default. */
1da177e4
LT		 211};
212
213/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
1da177e4 214const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
1da177e4
LT		 215const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
216
f24e3d65
MC		 217/* Check if a valid qdisc is available */
218static inline int addrconf_qdisc_ok(struct net_device *dev)
219{
220 return (dev->qdisc != &noop_qdisc);
221}
222
1da177e4
LT		 223static void addrconf_del_timer(struct inet6_ifaddr *ifp)
224{
225 if (del_timer(&ifp->timer))
226 __in6_ifa_put(ifp);
227}
228
229enum addrconf_timer_t
230{
231 AC_NONE,
232 AC_DAD,
233 AC_RS,
234};
235
236static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
238 unsigned long when)
239{
240 if (!del_timer(&ifp->timer))
241 in6_ifa_hold(ifp);
242
243 switch (what) {
244 case AC_DAD:
245 ifp->timer.function = addrconf_dad_timer;
246 break;
247 case AC_RS:
248 ifp->timer.function = addrconf_rs_timer;
249 break;
250 default:;
251 }
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
254}
255
7f7d9a6b
HX		 256static int snmp6_alloc_dev(struct inet6_dev *idev)
257{
258 int err = -ENOMEM;
259
260 if (!idev || !idev->dev)
261 return -EINVAL;
262
263 if (snmp_mib_init((void **)idev->stats.ipv6,
264 sizeof(struct ipstats_mib),
265 __alignof__(struct ipstats_mib)) < 0)
266 goto err_ip;
267 if (snmp_mib_init((void **)idev->stats.icmpv6,
268 sizeof(struct icmpv6_mib),
269 __alignof__(struct icmpv6_mib)) < 0)
270 goto err_icmp;
14878f75
DS		 271 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
272 sizeof(struct icmpv6msg_mib),
273 __alignof__(struct icmpv6msg_mib)) < 0)
274 goto err_icmpmsg;
7f7d9a6b
HX		 275
276 return 0;
277
14878f75
DS		 278err_icmpmsg:
279 snmp_mib_free((void **)idev->stats.icmpv6);
7f7d9a6b
HX		 280err_icmp:
281 snmp_mib_free((void **)idev->stats.ipv6);
282err_ip:
283 return err;
284}
285
16910b98 286static void snmp6_free_dev(struct inet6_dev *idev)
7f7d9a6b 287{
14878f75 288 snmp_mib_free((void **)idev->stats.icmpv6msg);
7f7d9a6b
HX		 289 snmp_mib_free((void **)idev->stats.icmpv6);
290 snmp_mib_free((void **)idev->stats.ipv6);
7f7d9a6b
HX		 291}
292
1da177e4
LT		 293/* Nobody refers to this device, we may destroy it. */
294
8814c4b5
YH		 295static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
296{
297 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
298 kfree(idev);
299}
300
1da177e4
LT		 301void in6_dev_finish_destroy(struct inet6_dev *idev)
302{
303 struct net_device *dev = idev->dev;
304 BUG_TRAP(idev->addr_list==NULL);
305 BUG_TRAP(idev->mc_list==NULL);
306#ifdef NET_REFCNT_DEBUG
307 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
308#endif
309 dev_put(dev);
310 if (!idev->dead) {
311 printk("Freeing alive inet6 device %p\n", idev);
312 return;
313 }
314 snmp6_free_dev(idev);
8814c4b5 315 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
1da177e4
LT		 316}
317
7159039a
YH		 318EXPORT_SYMBOL(in6_dev_finish_destroy);
319
1da177e4
LT		 320static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
321{
322 struct inet6_dev *ndev;
d88ae4cc 323 struct in6_addr maddr;
1da177e4
LT		 324
325 ASSERT_RTNL();
326
327 if (dev->mtu < IPV6_MIN_MTU)
328 return NULL;
329
1ab1457c 330 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
322f74a4 331
1ab1457c
YH		 332 if (ndev == NULL)
333 return NULL;
322f74a4
IO		 334
335 rwlock_init(&ndev->lock);
336 ndev->dev = dev;
337 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
338 ndev->cnf.mtu6 = dev->mtu;
339 ndev->cnf.sysctl = NULL;
340 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
341 if (ndev->nd_parms == NULL) {
342 kfree(ndev);
343 return NULL;
344 }
345 /* We refer to the device */
346 dev_hold(dev);
1da177e4 347
322f74a4
IO		 348 if (snmp6_alloc_dev(ndev) < 0) {
349 ADBG((KERN_WARNING
350 "%s(): cannot allocate memory for statistics; dev=%s.\n",
351 __FUNCTION__, dev->name));
352 neigh_parms_release(&nd_tbl, ndev->nd_parms);
353 ndev->dead = 1;
354 in6_dev_finish_destroy(ndev);
355 return NULL;
356 }
1da177e4 357
322f74a4
IO		 358 if (snmp6_register_dev(ndev) < 0) {
359 ADBG((KERN_WARNING
360 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
361 __FUNCTION__, dev->name));
362 neigh_parms_release(&nd_tbl, ndev->nd_parms);
363 ndev->dead = 1;
364 in6_dev_finish_destroy(ndev);
365 return NULL;
366 }
367
368 /* One reference from device. We must do this before
369 * we invoke __ipv6_regen_rndid().
370 */
371 in6_dev_hold(ndev);
1da177e4
LT		 372
373#ifdef CONFIG_IPV6_PRIVACY
322f74a4
IO		 374 init_timer(&ndev->regen_timer);
375 ndev->regen_timer.function = ipv6_regen_rndid;
376 ndev->regen_timer.data = (unsigned long) ndev;
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
0be669bb
JR		 379#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
380 dev->type == ARPHRD_SIT ||
381#endif
382 dev->type == ARPHRD_NONE) {
322f74a4
IO		 383 printk(KERN_INFO
384 "%s: Disabled Privacy Extensions\n",
385 dev->name);
386 ndev->cnf.use_tempaddr = -1;
387 } else {
388 in6_dev_hold(ndev);
389 ipv6_regen_rndid((unsigned long) ndev);
390 }
1da177e4
LT		 391#endif
392
f24e3d65 393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
53aadcc9
HX		 394 ndev->if_flags |= IF_READY;
395
322f74a4
IO		 396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
1da177e4 398#ifdef CONFIG_SYSCTL
322f74a4
IO		 399 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
400 NET_IPV6_NEIGH, "ipv6",
401 &ndisc_ifinfo_sysctl_change,
402 NULL);
403 addrconf_sysctl_register(ndev, &ndev->cnf);
1da177e4 404#endif
30c4cf57
DS		 405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
d88ae4cc
YH		 407
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
411
1da177e4
LT		 412 return ndev;
413}
414
415static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
416{
417 struct inet6_dev *idev;
418
419 ASSERT_RTNL();
420
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
423 return NULL;
424 }
c5e33bdd 425
1da177e4
LT		 426 if (dev->flags&IFF_UP)
427 ipv6_mc_up(idev);
428 return idev;
429}
430
431#ifdef CONFIG_SYSCTL
432static void dev_forward_change(struct inet6_dev *idev)
433{
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
437
438 if (!idev)
439 return;
440 dev = idev->dev;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
1ab1457c 443
1da177e4
LT		 444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
446 else
447 ipv6_dev_mc_dec(dev, &addr);
448 }
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
2c12a74c
MW		 450 if (ifa->flags&IFA_F_TENTATIVE)
451 continue;
1da177e4
LT		 452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
454 else
455 addrconf_leave_anycast(ifa);
456 }
457}
458
459
460static void addrconf_forward_change(void)
461{
462 struct net_device *dev;
463 struct inet6_dev *idev;
464
465 read_lock(&dev_base_lock);
881d966b 466 for_each_netdev(&init_net, dev) {
8814c4b5 467 rcu_read_lock();
1da177e4
LT		 468 idev = __in6_dev_get(dev);
469 if (idev) {
470 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
471 idev->cnf.forwarding = ipv6_devconf.forwarding;
472 if (changed)
473 dev_forward_change(idev);
474 }
8814c4b5 475 rcu_read_unlock();
1da177e4
LT		 476 }
477 read_unlock(&dev_base_lock);
478}
479#endif
480
481/* Nobody refers to this ifaddr, destroy it */
482
483void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
484{
485 BUG_TRAP(ifp->if_next==NULL);
486 BUG_TRAP(ifp->lst_next==NULL);
487#ifdef NET_REFCNT_DEBUG
488 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
489#endif
490
491 in6_dev_put(ifp->idev);
492
493 if (del_timer(&ifp->timer))
494 printk("Timer is still running, when freeing ifa=%p\n", ifp);
495
496 if (!ifp->dead) {
497 printk("Freeing alive inet6 address %p\n", ifp);
498 return;
499 }
500 dst_release(&ifp->rt->u.dst);
501
502 kfree(ifp);
503}
504
e55ffac6
BH		 505static void
506ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
507{
508 struct inet6_ifaddr *ifa, **ifap;
8a6ce0c0 509 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
e55ffac6
BH		 510
511 /*
512 * Each device address list is sorted in order of scope -
513 * global before linklocal.
514 */
515 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
516 ifap = &ifa->if_next) {
8a6ce0c0 517 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
e55ffac6
BH		 518 break;
519 }
520
521 ifp->if_next = *ifap;
522 *ifap = ifp;
523}
524
1da177e4
LT		 525/* On success it returns ifp with increased reference count */
526
527static struct inet6_ifaddr *
528ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
e431b8c0 529 int scope, u32 flags)
1da177e4
LT		 530{
531 struct inet6_ifaddr *ifa = NULL;
532 struct rt6_info *rt;
533 int hash;
534 int err = 0;
535
8814c4b5 536 rcu_read_lock_bh();
1da177e4
LT		 537 if (idev->dead) {
538 err = -ENODEV; /*XXX*/
539 goto out2;
540 }
541
542 write_lock(&addrconf_hash_lock);
543
544 /* Ignore adding duplicate addresses on an interface */
545 if (ipv6_chk_same_addr(addr, idev->dev)) {
546 ADBG(("ipv6_add_addr: already assigned\n"));
547 err = -EEXIST;
548 goto out;
549 }
550
322f74a4 551 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1da177e4
LT		 552
553 if (ifa == NULL) {
554 ADBG(("ipv6_add_addr: malloc failed\n"));
555 err = -ENOBUFS;
556 goto out;
557 }
558
559 rt = addrconf_dst_alloc(idev, addr, 0);
560 if (IS_ERR(rt)) {
561 err = PTR_ERR(rt);
562 goto out;
563 }
564
1da177e4
LT		 565 ipv6_addr_copy(&ifa->addr, addr);
566
567 spin_lock_init(&ifa->lock);
568 init_timer(&ifa->timer);
569 ifa->timer.data = (unsigned long) ifa;
570 ifa->scope = scope;
571 ifa->prefix_len = pfxlen;
572 ifa->flags = flags | IFA_F_TENTATIVE;
573 ifa->cstamp = ifa->tstamp = jiffies;
574
57f5f544
KF		 575 ifa->rt = rt;
576
95c385b4
NH		 577 /*
578 * part one of RFC 4429, section 3.3
579 * We should not configure an address as
580 * optimistic if we do not yet know the link
581 * layer address of our nexhop router
582 */
583
584 if (rt->rt6i_nexthop == NULL)
585 ifa->flags &= ~IFA_F_OPTIMISTIC;
586
1da177e4
LT		 587 ifa->idev = idev;
588 in6_dev_hold(idev);
589 /* For caller */
590 in6_ifa_hold(ifa);
591
592 /* Add to big hash table */
593 hash = ipv6_addr_hash(addr);
594
595 ifa->lst_next = inet6_addr_lst[hash];
596 inet6_addr_lst[hash] = ifa;
597 in6_ifa_hold(ifa);
598 write_unlock(&addrconf_hash_lock);
599
600 write_lock(&idev->lock);
601 /* Add to inet6_dev unicast addr list. */
e55ffac6 602 ipv6_link_dev_addr(idev, ifa);
1da177e4
LT		 603
604#ifdef CONFIG_IPV6_PRIVACY
605 if (ifa->flags&IFA_F_TEMPORARY) {
606 ifa->tmp_next = idev->tempaddr_list;
607 idev->tempaddr_list = ifa;
608 in6_ifa_hold(ifa);
609 }
610#endif
611
1da177e4
LT		 612 in6_ifa_hold(ifa);
613 write_unlock(&idev->lock);
614out2:
8814c4b5 615 rcu_read_unlock_bh();
1da177e4 616
fd92833a 617 if (likely(err == 0))
e041c683 618 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
1da177e4
LT		 619 else {
620 kfree(ifa);
621 ifa = ERR_PTR(err);
622 }
623
624 return ifa;
625out:
626 write_unlock(&addrconf_hash_lock);
627 goto out2;
628}
629
630/* This function wants to get referenced ifp and releases it before return */
631
632static void ipv6_del_addr(struct inet6_ifaddr *ifp)
633{
634 struct inet6_ifaddr *ifa, **ifap;
635 struct inet6_dev *idev = ifp->idev;
636 int hash;
637 int deleted = 0, onlink = 0;
638 unsigned long expires = jiffies;
639
640 hash = ipv6_addr_hash(&ifp->addr);
641
642 ifp->dead = 1;
643
644 write_lock_bh(&addrconf_hash_lock);
645 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
646 ifap = &ifa->lst_next) {
647 if (ifa == ifp) {
648 *ifap = ifa->lst_next;
649 __in6_ifa_put(ifp);
650 ifa->lst_next = NULL;
651 break;
652 }
653 }
654 write_unlock_bh(&addrconf_hash_lock);
655
656 write_lock_bh(&idev->lock);
657#ifdef CONFIG_IPV6_PRIVACY
658 if (ifp->flags&IFA_F_TEMPORARY) {
659 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
660 ifap = &ifa->tmp_next) {
661 if (ifa == ifp) {
662 *ifap = ifa->tmp_next;
663 if (ifp->ifpub) {
664 in6_ifa_put(ifp->ifpub);
665 ifp->ifpub = NULL;
666 }
667 __in6_ifa_put(ifp);
668 ifa->tmp_next = NULL;
669 break;
670 }
671 }
672 }
673#endif
674
1d142804 675 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
1da177e4
LT		 676 if (ifa == ifp) {
677 *ifap = ifa->if_next;
678 __in6_ifa_put(ifp);
679 ifa->if_next = NULL;
680 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
681 break;
682 deleted = 1;
1d142804 683 continue;
1da177e4
LT		 684 } else if (ifp->flags & IFA_F_PERMANENT) {
685 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
686 ifp->prefix_len)) {
687 if (ifa->flags & IFA_F_PERMANENT) {
688 onlink = 1;
689 if (deleted)
690 break;
691 } else {
692 unsigned long lifetime;
693
694 if (!onlink)
695 onlink = -1;
696
697 spin_lock(&ifa->lock);
698 lifetime = min_t(unsigned long,
699 ifa->valid_lft, 0x7fffffffUL/HZ);
700 if (time_before(expires,
701 ifa->tstamp + lifetime * HZ))
702 expires = ifa->tstamp + lifetime * HZ;
703 spin_unlock(&ifa->lock);
704 }
705 }
706 }
1d142804 707 ifap = &ifa->if_next;
1da177e4
LT		 708 }
709 write_unlock_bh(&idev->lock);
710
711 ipv6_ifa_notify(RTM_DELADDR, ifp);
712
e041c683 713 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
1da177e4
LT		 714
715 addrconf_del_timer(ifp);
716
717 /*
718 * Purge or update corresponding prefix
719 *
720 * 1) we don't purge prefix here if address was not permanent.
721 * prefix is managed by its own lifetime.
722 * 2) if there're no addresses, delete prefix.
723 * 3) if there're still other permanent address(es),
724 * corresponding prefix is still permanent.
725 * 4) otherwise, update prefix lifetime to the
726 * longest valid lifetime among the corresponding
727 * addresses on the device.
728 * Note: subsequent RA will update lifetime.
729 *
730 * --yoshfuji
731 */
732 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
733 struct in6_addr prefix;
734 struct rt6_info *rt;
735
736 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
737 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
738
739 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
740 if (onlink == 0) {
e0a1ad73 741 ip6_del_rt(rt);
1da177e4
LT		 742 rt = NULL;
743 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
744 rt->rt6i_expires = expires;
745 rt->rt6i_flags |= RTF_EXPIRES;
746 }
747 }
748 dst_release(&rt->u.dst);
749 }
750
751 in6_ifa_put(ifp);
752}
753
754#ifdef CONFIG_IPV6_PRIVACY
755static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
756{
757 struct inet6_dev *idev = ifp->idev;
758 struct in6_addr addr, *tmpaddr;
759 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
760 int tmp_plen;
761 int ret = 0;
762 int max_addresses;
95c385b4 763 u32 addr_flags;
1da177e4
LT		 764
765 write_lock(&idev->lock);
766 if (ift) {
767 spin_lock_bh(&ift->lock);
768 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
769 spin_unlock_bh(&ift->lock);
770 tmpaddr = &addr;
771 } else {
772 tmpaddr = NULL;
773 }
774retry:
775 in6_dev_hold(idev);
776 if (idev->cnf.use_tempaddr <= 0) {
777 write_unlock(&idev->lock);
778 printk(KERN_INFO
779 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
780 in6_dev_put(idev);
781 ret = -1;
782 goto out;
783 }
784 spin_lock_bh(&ifp->lock);
785 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
786 idev->cnf.use_tempaddr = -1; /*XXX*/
787 spin_unlock_bh(&ifp->lock);
788 write_unlock(&idev->lock);
789 printk(KERN_WARNING
790 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
791 in6_dev_put(idev);
792 ret = -1;
793 goto out;
794 }
795 in6_ifa_hold(ifp);
796 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
797 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
798 spin_unlock_bh(&ifp->lock);
799 write_unlock(&idev->lock);
800 printk(KERN_WARNING
801 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
802 in6_ifa_put(ifp);
803 in6_dev_put(idev);
804 ret = -1;
805 goto out;
806 }
807 memcpy(&addr.s6_addr[8], idev->rndid, 8);
808 tmp_valid_lft = min_t(__u32,
809 ifp->valid_lft,
810 idev->cnf.temp_valid_lft);
1ab1457c
YH		 811 tmp_prefered_lft = min_t(__u32,
812 ifp->prefered_lft,
1da177e4
LT		 813 idev->cnf.temp_prefered_lft - desync_factor / HZ);
814 tmp_plen = ifp->prefix_len;
815 max_addresses = idev->cnf.max_addresses;
816 tmp_cstamp = ifp->cstamp;
817 tmp_tstamp = ifp->tstamp;
818 spin_unlock_bh(&ifp->lock);
819
820 write_unlock(&idev->lock);
95c385b4
NH		 821
822 addr_flags = IFA_F_TEMPORARY;
823 /* set in addrconf_prefix_rcv() */
824 if (ifp->flags & IFA_F_OPTIMISTIC)
825 addr_flags |= IFA_F_OPTIMISTIC;
826
1da177e4 827 ift = !max_addresses ||
1ab1457c 828 ipv6_count_addresses(idev) < max_addresses ?
1da177e4 829 ipv6_add_addr(idev, &addr, tmp_plen,
95c385b4
NH		 830 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
831 addr_flags) : NULL;
1da177e4
LT		 832 if (!ift || IS_ERR(ift)) {
833 in6_ifa_put(ifp);
834 in6_dev_put(idev);
835 printk(KERN_INFO
836 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
837 tmpaddr = &addr;
838 write_lock(&idev->lock);
839 goto retry;
840 }
841
842 spin_lock_bh(&ift->lock);
843 ift->ifpub = ifp;
844 ift->valid_lft = tmp_valid_lft;
845 ift->prefered_lft = tmp_prefered_lft;
846 ift->cstamp = tmp_cstamp;
847 ift->tstamp = tmp_tstamp;
848 spin_unlock_bh(&ift->lock);
849
850 addrconf_dad_start(ift, 0);
851 in6_ifa_put(ift);
852 in6_dev_put(idev);
853out:
854 return ret;
855}
856#endif
857
858/*
072047e4 859 * Choose an appropriate source address (RFC3484)
1da177e4 860 */
072047e4
YH		 861struct ipv6_saddr_score {
862 int addr_type;
863 unsigned int attrs;
864 int matchlen;
0d27b427 865 int scope;
072047e4
YH		 866 unsigned int rule;
867};
868
869#define IPV6_SADDR_SCORE_LOCAL 0x0001
870#define IPV6_SADDR_SCORE_PREFERRED 0x0004
871#define IPV6_SADDR_SCORE_HOA 0x0008
872#define IPV6_SADDR_SCORE_OIF 0x0010
873#define IPV6_SADDR_SCORE_LABEL 0x0020
874#define IPV6_SADDR_SCORE_PRIVACY 0x0040
875
b6f99a21 876static inline int ipv6_saddr_preferred(int type)
1da177e4 877{
072047e4
YH		 878 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
879 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
880 return 1;
881 return 0;
1da177e4
LT		 882}
883
072047e4 884/* static matching label */
b6f99a21 885static inline int ipv6_saddr_label(const struct in6_addr *addr, int type)
072047e4
YH		 886{
887 /*
888 * prefix (longest match) label
889 * -----------------------------
890 * ::1/128 0
891 * ::/0 1
892 * 2002::/16 2
893 * ::/96 3
894 * ::ffff:0:0/96 4
102128e3
ŁS		 895 * fc00::/7 5
896 * 2001::/32 6
072047e4
YH		 897 */
898 if (type & IPV6_ADDR_LOOPBACK)
899 return 0;
900 else if (type & IPV6_ADDR_COMPATv4)
901 return 3;
902 else if (type & IPV6_ADDR_MAPPED)
903 return 4;
102128e3
ŁS		 904 else if (addr->s6_addr32[0] == htonl(0x20010000))
905 return 6;
072047e4
YH		 906 else if (addr->s6_addr16[0] == htons(0x2002))
907 return 2;
102128e3
ŁS		 908 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
909 return 5;
072047e4
YH		 910 return 1;
911}
1da177e4 912
072047e4 913int ipv6_dev_get_saddr(struct net_device *daddr_dev,
1da177e4
LT		 914 struct in6_addr *daddr, struct in6_addr *saddr)
915{
072047e4
YH		 916 struct ipv6_saddr_score hiscore;
917 struct inet6_ifaddr *ifa_result = NULL;
918 int daddr_type = __ipv6_addr_type(daddr);
919 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
920 u32 daddr_label = ipv6_saddr_label(daddr, daddr_type);
921 struct net_device *dev;
1da177e4 922
072047e4 923 memset(&hiscore, 0, sizeof(hiscore));
1da177e4 924
072047e4 925 read_lock(&dev_base_lock);
8814c4b5 926 rcu_read_lock();
1da177e4 927
881d966b 928 for_each_netdev(&init_net, dev) {
072047e4
YH		 929 struct inet6_dev *idev;
930 struct inet6_ifaddr *ifa;
931
932 /* Rule 0: Candidate Source Address (section 4)
933 * - multicast and link-local destination address,
934 * the set of candidate source address MUST only
935 * include addresses assigned to interfaces
936 * belonging to the same link as the outgoing
937 * interface.
938 * (- For site-local destination addresses, the
939 * set of candidate source addresses MUST only
940 * include addresses assigned to interfaces
941 * belonging to the same site as the outgoing
942 * interface.)
943 */
944 if ((daddr_type & IPV6_ADDR_MULTICAST ||
945 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
946 daddr_dev && dev != daddr_dev)
947 continue;
1da177e4 948
1da177e4 949 idev = __in6_dev_get(dev);
072047e4
YH		 950 if (!idev)
951 continue;
952
953 read_lock_bh(&idev->lock);
954 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
955 struct ipv6_saddr_score score;
956
957 score.addr_type = __ipv6_addr_type(&ifa->addr);
958
6b3ae80a
YH		 959 /* Rule 0:
960 * - Tentative Address (RFC2462 section 5.4)
961 * - A tentative address is not considered
962 * "assigned to an interface" in the traditional
95c385b4 963 * sense, unless it is also flagged as optimistic.
6b3ae80a 964 * - Candidate Source Address (section 4)
072047e4
YH		 965 * - In any case, anycast addresses, multicast
966 * addresses, and the unspecified address MUST
967 * NOT be included in a candidate set.
968 */
95c385b4
NH		 969 if ((ifa->flags & IFA_F_TENTATIVE) &&
970 (!(ifa->flags & IFA_F_OPTIMISTIC)))
6b3ae80a 971 continue;
072047e4
YH		 972 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
973 score.addr_type & IPV6_ADDR_MULTICAST)) {
974 LIMIT_NETDEBUG(KERN_DEBUG
975 "ADDRCONF: unspecified / multicast address"
976 "assigned as unicast address on %s",
977 dev->name);
978 continue;
979 }
980
981 score.attrs = 0;
982 score.matchlen = 0;
983 score.scope = 0;
984 score.rule = 0;
985
986 if (ifa_result == NULL) {
987 /* record it if the first available entry */
988 goto record_it;
989 }
990
991 /* Rule 1: Prefer same address */
992 if (hiscore.rule < 1) {
993 if (ipv6_addr_equal(&ifa_result->addr, daddr))
994 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
995 hiscore.rule++;
996 }
997 if (ipv6_addr_equal(&ifa->addr, daddr)) {
998 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
999 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
1000 score.rule = 1;
1001 goto record_it;
1da177e4 1002 }
072047e4
YH		 1003 } else {
1004 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1005 continue;
1da177e4 1006 }
1da177e4 1007
072047e4
YH		 1008 /* Rule 2: Prefer appropriate scope */
1009 if (hiscore.rule < 2) {
1010 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1011 hiscore.rule++;
1012 }
1013 score.scope = __ipv6_addr_src_scope(score.addr_type);
1014 if (hiscore.scope < score.scope) {
1015 if (hiscore.scope < daddr_scope) {
1016 score.rule = 2;
1017 goto record_it;
1018 } else
1019 continue;
1020 } else if (score.scope < hiscore.scope) {
1021 if (score.scope < daddr_scope)
e55ffac6 1022 break; /* addresses sorted by scope */
072047e4
YH		 1023 else {
1024 score.rule = 2;
1025 goto record_it;
1026 }
1027 }
1da177e4 1028
95c385b4 1029 /* Rule 3: Avoid deprecated and optimistic addresses */
072047e4
YH		 1030 if (hiscore.rule < 3) {
1031 if (ipv6_saddr_preferred(hiscore.addr_type) ||
95c385b4
NH		 1032 (((ifa_result->flags &
1033 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
072047e4
YH		 1034 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1035 hiscore.rule++;
1036 }
1037 if (ipv6_saddr_preferred(score.addr_type) ||
6ae5f983 1038 (((ifa->flags &
95c385b4 1039 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
072047e4
YH		 1040 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1041 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1042 score.rule = 3;
1043 goto record_it;
1044 }
1045 } else {
1046 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1047 continue;
1048 }
1da177e4 1049
3b9f9a1c 1050 /* Rule 4: Prefer home address */
59fbb3a6 1051#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 1052 if (hiscore.rule < 4) {
1053 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1054 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1055 hiscore.rule++;
1056 }
1057 if (ifa->flags & IFA_F_HOMEADDRESS) {
1058 score.attrs |= IPV6_SADDR_SCORE_HOA;
1059 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1060 score.rule = 4;
1061 goto record_it;
1062 }
1063 } else {
1064 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1065 continue;
1066 }
1067#else
220bbd74
YH		 1068 if (hiscore.rule < 4)
1069 hiscore.rule++;
3b9f9a1c 1070#endif
072047e4
YH		 1071
1072 /* Rule 5: Prefer outgoing interface */
1073 if (hiscore.rule < 5) {
1074 if (daddr_dev == NULL ||
1075 daddr_dev == ifa_result->idev->dev)
1076 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1077 hiscore.rule++;
1078 }
1079 if (daddr_dev == NULL ||
1080 daddr_dev == ifa->idev->dev) {
1081 score.attrs |= IPV6_SADDR_SCORE_OIF;
1082 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1083 score.rule = 5;
1084 goto record_it;
1085 }
1086 } else {
1087 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1088 continue;
1089 }
1090
1091 /* Rule 6: Prefer matching label */
1092 if (hiscore.rule < 6) {
1093 if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label)
1094 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1095 hiscore.rule++;
1096 }
1097 if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) {
1098 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1099 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1100 score.rule = 6;
1101 goto record_it;
1da177e4 1102 }
072047e4
YH		 1103 } else {
1104 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1105 continue;
1106 }
1107
44fd0261 1108#ifdef CONFIG_IPV6_PRIVACY
072047e4
YH		 1109 /* Rule 7: Prefer public address
1110 * Note: prefer temprary address if use_tempaddr >= 2
1111 */
1112 if (hiscore.rule < 7) {
1113 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1114 (ifa_result->idev->cnf.use_tempaddr >= 2))
1115 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 hiscore.rule++;
1117 }
1118 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1119 (ifa->idev->cnf.use_tempaddr >= 2)) {
1120 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1121 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1122 score.rule = 7;
1123 goto record_it;
1124 }
1125 } else {
1126 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1127 continue;
1128 }
5e2707fa
YH		 1129#else
1130 if (hiscore.rule < 7)
1131 hiscore.rule++;
44fd0261 1132#endif
072047e4 1133 /* Rule 8: Use longest matching prefix */
12da2a43 1134 if (hiscore.rule < 8) {
072047e4 1135 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
12da2a43
YZ		 1136 hiscore.rule++;
1137 }
072047e4
YH		 1138 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1139 if (score.matchlen > hiscore.matchlen) {
1140 score.rule = 8;
1141 goto record_it;
1da177e4 1142 }
072047e4
YH		 1143#if 0
1144 else if (score.matchlen < hiscore.matchlen)
1145 continue;
1146#endif
1147
1148 /* Final Rule: choose first available one */
1149 continue;
1150record_it:
1151 if (ifa_result)
1152 in6_ifa_put(ifa_result);
1153 in6_ifa_hold(ifa);
1154 ifa_result = ifa;
1155 hiscore = score;
1da177e4 1156 }
072047e4 1157 read_unlock_bh(&idev->lock);
1da177e4 1158 }
8814c4b5 1159 rcu_read_unlock();
1da177e4
LT		 1160 read_unlock(&dev_base_lock);
1161
072047e4
YH		 1162 if (!ifa_result)
1163 return -EADDRNOTAVAIL;
1ab1457c 1164
072047e4
YH		 1165 ipv6_addr_copy(saddr, &ifa_result->addr);
1166 in6_ifa_put(ifa_result);
1167 return 0;
1da177e4
LT		 1168}
1169
1170
1171int ipv6_get_saddr(struct dst_entry *dst,
1172 struct in6_addr *daddr, struct in6_addr *saddr)
1173{
7a3025b1 1174 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1da177e4
LT		 1175}
1176
7159039a 1177EXPORT_SYMBOL(ipv6_get_saddr);
1da177e4 1178
95c385b4
NH		 1179int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1180 unsigned char banned_flags)
1da177e4
LT		 1181{
1182 struct inet6_dev *idev;
1183 int err = -EADDRNOTAVAIL;
1184
8814c4b5 1185 rcu_read_lock();
1da177e4
LT		 1186 if ((idev = __in6_dev_get(dev)) != NULL) {
1187 struct inet6_ifaddr *ifp;
1188
1189 read_lock_bh(&idev->lock);
1190 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
95c385b4 1191 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1da177e4
LT		 1192 ipv6_addr_copy(addr, &ifp->addr);
1193 err = 0;
1194 break;
1195 }
1196 }
1197 read_unlock_bh(&idev->lock);
1198 }
8814c4b5 1199 rcu_read_unlock();
1da177e4
LT		 1200 return err;
1201}
1202
1203static int ipv6_count_addresses(struct inet6_dev *idev)
1204{
1205 int cnt = 0;
1206 struct inet6_ifaddr *ifp;
1207
1208 read_lock_bh(&idev->lock);
1209 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1210 cnt++;
1211 read_unlock_bh(&idev->lock);
1212 return cnt;
1213}
1214
1215int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1216{
1217 struct inet6_ifaddr * ifp;
1218 u8 hash = ipv6_addr_hash(addr);
1219
1220 read_lock_bh(&addrconf_hash_lock);
1221 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1222 if (ipv6_addr_equal(&ifp->addr, addr) &&
1223 !(ifp->flags&IFA_F_TENTATIVE)) {
1224 if (dev == NULL || ifp->idev->dev == dev ||
1225 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1226 break;
1227 }
1228 }
1229 read_unlock_bh(&addrconf_hash_lock);
1230 return ifp != NULL;
1231}
1232
7159039a
YH		 1233EXPORT_SYMBOL(ipv6_chk_addr);
1234
1da177e4
LT		 1235static
1236int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1237{
1238 struct inet6_ifaddr * ifp;
1239 u8 hash = ipv6_addr_hash(addr);
1240
1241 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1242 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243 if (dev == NULL || ifp->idev->dev == dev)
1244 break;
1245 }
1246 }
1247 return ifp != NULL;
1248}
1249
1250struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1251{
1252 struct inet6_ifaddr * ifp;
1253 u8 hash = ipv6_addr_hash(addr);
1254
1255 read_lock_bh(&addrconf_hash_lock);
1256 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1257 if (ipv6_addr_equal(&ifp->addr, addr)) {
1258 if (dev == NULL || ifp->idev->dev == dev ||
1259 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1260 in6_ifa_hold(ifp);
1261 break;
1262 }
1263 }
1264 }
1265 read_unlock_bh(&addrconf_hash_lock);
1266
1267 return ifp;
1268}
1269
1270int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1271{
1272 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
0fa1a53e 1273 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
82103232
AV		 1274 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1275 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1da177e4 1276 int sk_ipv6only = ipv6_only_sock(sk);
463c84b9 1277 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1da177e4
LT		 1278 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1279 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1280
1281 if (!sk2_rcv_saddr && !sk_ipv6only)
1282 return 1;
1283
1284 if (addr_type2 == IPV6_ADDR_ANY &&
1285 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1286 return 1;
1287
1288 if (addr_type == IPV6_ADDR_ANY &&
1289 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1290 return 1;
1291
1292 if (sk2_rcv_saddr6 &&
1293 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1294 return 1;
1295
1296 if (addr_type == IPV6_ADDR_MAPPED &&
1297 !sk2_ipv6only &&
1298 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1299 return 1;
1300
1301 return 0;
1302}
1303
1304/* Gets referenced address, destroys ifaddr */
1305
9f5336e2 1306static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1da177e4 1307{
1da177e4
LT		 1308 if (ifp->flags&IFA_F_PERMANENT) {
1309 spin_lock_bh(&ifp->lock);
1310 addrconf_del_timer(ifp);
1311 ifp->flags |= IFA_F_TENTATIVE;
1312 spin_unlock_bh(&ifp->lock);
1313 in6_ifa_put(ifp);
1314#ifdef CONFIG_IPV6_PRIVACY
1315 } else if (ifp->flags&IFA_F_TEMPORARY) {
1316 struct inet6_ifaddr *ifpub;
1317 spin_lock_bh(&ifp->lock);
1318 ifpub = ifp->ifpub;
1319 if (ifpub) {
1320 in6_ifa_hold(ifpub);
1321 spin_unlock_bh(&ifp->lock);
1322 ipv6_create_tempaddr(ifpub, ifp);
1323 in6_ifa_put(ifpub);
1324 } else {
1325 spin_unlock_bh(&ifp->lock);
1326 }
1327 ipv6_del_addr(ifp);
1328#endif
1329 } else
1330 ipv6_del_addr(ifp);
1331}
1332
3c21edbd
YH		 1333void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1334{
1335 if (net_ratelimit())
1336 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1337 addrconf_dad_stop(ifp);
1338}
1da177e4
LT		 1339
1340/* Join to solicited addr multicast group. */
1341
1342void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1343{
1344 struct in6_addr maddr;
1345
1346 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1347 return;
1348
1349 addrconf_addr_solict_mult(addr, &maddr);
1350 ipv6_dev_mc_inc(dev, &maddr);
1351}
1352
1353void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1354{
1355 struct in6_addr maddr;
1356
1357 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1358 return;
1359
1360 addrconf_addr_solict_mult(addr, &maddr);
1361 __ipv6_dev_mc_dec(idev, &maddr);
1362}
1363
20380731 1364static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1365{
1366 struct in6_addr addr;
1367 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1368 if (ipv6_addr_any(&addr))
1369 return;
1370 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1371}
1372
20380731 1373static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1da177e4
LT		 1374{
1375 struct in6_addr addr;
1376 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1377 if (ipv6_addr_any(&addr))
1378 return;
1379 __ipv6_dev_ac_dec(ifp->idev, &addr);
1380}
1381
073a8e0e
YH		 1382static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1383{
1384 if (dev->addr_len != ETH_ALEN)
1385 return -1;
1386 memcpy(eui, dev->dev_addr, 3);
1387 memcpy(eui + 5, dev->dev_addr + 3, 3);
1388
1389 /*
1390 * The zSeries OSA network cards can be shared among various
1391 * OS instances, but the OSA cards have only one MAC address.
1392 * This leads to duplicate address conflicts in conjunction
1393 * with IPv6 if more than one instance uses the same card.
1394 *
1395 * The driver for these cards can deliver a unique 16-bit
1396 * identifier for each instance sharing the same card. It is
1397 * placed instead of 0xFFFE in the interface identifier. The
1398 * "u" bit of the interface identifier is not inverted in this
1399 * case. Hence the resulting interface identifier has local
1400 * scope according to RFC2373.
1401 */
1402 if (dev->dev_id) {
1403 eui[3] = (dev->dev_id >> 8) & 0xFF;
1404 eui[4] = dev->dev_id & 0xFF;
1405 } else {
1406 eui[3] = 0xFF;
1407 eui[4] = 0xFE;
1408 eui[0] ^= 2;
1409 }
1410 return 0;
1411}
1412
1413static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1414{
1415 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1416 if (dev->addr_len != ARCNET_ALEN)
1417 return -1;
1418 memset(eui, 0, 7);
1419 eui[7] = *(u8*)dev->dev_addr;
1420 return 0;
1421}
1422
1423static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1424{
1425 if (dev->addr_len != INFINIBAND_ALEN)
1426 return -1;
1427 memcpy(eui, dev->dev_addr + 12, 8);
1428 eui[0] |= 2;
1429 return 0;
1430}
1431
1da177e4
LT		 1432static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1433{
1434 switch (dev->type) {
1435 case ARPHRD_ETHER:
1436 case ARPHRD_FDDI:
1437 case ARPHRD_IEEE802_TR:
073a8e0e 1438 return addrconf_ifid_eui48(eui, dev);
1da177e4 1439 case ARPHRD_ARCNET:
073a8e0e 1440 return addrconf_ifid_arcnet(eui, dev);
1da177e4 1441 case ARPHRD_INFINIBAND:
073a8e0e 1442 return addrconf_ifid_infiniband(eui, dev);
1da177e4
LT		 1443 }
1444 return -1;
1445}
1446
1447static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1448{
1449 int err = -1;
1450 struct inet6_ifaddr *ifp;
1451
1452 read_lock_bh(&idev->lock);
1453 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1454 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1455 memcpy(eui, ifp->addr.s6_addr+8, 8);
1456 err = 0;
1457 break;
1458 }
1459 }
1460 read_unlock_bh(&idev->lock);
1461 return err;
1462}
1463
1464#ifdef CONFIG_IPV6_PRIVACY
1465/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1466static int __ipv6_regen_rndid(struct inet6_dev *idev)
1467{
1da177e4 1468regen:
955189ef 1469 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1da177e4 1470 idev->rndid[0] &= ~0x02;
1da177e4
LT		 1471
1472 /*
1473 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1474 * check if generated address is not inappropriate
1475 *
1476 * - Reserved subnet anycast (RFC 2526)
1477 * 11111101 11....11 1xxxxxxx
1478 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1479 * 00-00-5E-FE-xx-xx-xx-xx
1480 * - value 0
1481 * - XXX: already assigned to an address on the device
1482 */
1ab1457c 1483 if (idev->rndid[0] == 0xfd &&
1da177e4
LT		 1484 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1485 (idev->rndid[7]&0x80))
1486 goto regen;
1487 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1488 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1489 goto regen;
1490 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1491 goto regen;
1492 }
1493
1494 return 0;
1495}
1496
1497static void ipv6_regen_rndid(unsigned long data)
1498{
1499 struct inet6_dev *idev = (struct inet6_dev *) data;
1500 unsigned long expires;
1501
8814c4b5 1502 rcu_read_lock_bh();
1da177e4
LT		 1503 write_lock_bh(&idev->lock);
1504
1505 if (idev->dead)
1506 goto out;
1507
1508 if (__ipv6_regen_rndid(idev) < 0)
1509 goto out;
1ab1457c 1510
1da177e4 1511 expires = jiffies +
1ab1457c 1512 idev->cnf.temp_prefered_lft * HZ -
1da177e4
LT		 1513 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1514 if (time_before(expires, jiffies)) {
1515 printk(KERN_WARNING
1516 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1517 idev->dev->name);
1518 goto out;
1519 }
1520
1521 if (!mod_timer(&idev->regen_timer, expires))
1522 in6_dev_hold(idev);
1523
1524out:
1525 write_unlock_bh(&idev->lock);
8814c4b5 1526 rcu_read_unlock_bh();
1da177e4
LT		 1527 in6_dev_put(idev);
1528}
1529
1530static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1531 int ret = 0;
1532
1533 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1534 ret = __ipv6_regen_rndid(idev);
1535 return ret;
1536}
1537#endif
1538
1539/*
1540 * Add prefix route.
1541 */
1542
1543static void
1544addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
e431b8c0 1545 unsigned long expires, u32 flags)
1da177e4 1546{
86872cb5
TG		 1547 struct fib6_config cfg = {
1548 .fc_table = RT6_TABLE_PREFIX,
1549 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1550 .fc_ifindex = dev->ifindex,
1551 .fc_expires = expires,
1552 .fc_dst_len = plen,
1553 .fc_flags = RTF_UP | flags,
1554 };
1da177e4 1555
86872cb5 1556 ipv6_addr_copy(&cfg.fc_dst, pfx);
1da177e4
LT		 1557
1558 /* Prevent useless cloning on PtP SIT.
1559 This thing is done here expecting that the whole
1560 class of non-broadcast devices need not cloning.
1561 */
0be669bb 1562#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
86872cb5
TG		 1563 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1564 cfg.fc_flags |= RTF_NONEXTHOP;
0be669bb 1565#endif
1da177e4 1566
86872cb5 1567 ip6_route_add(&cfg);
1da177e4
LT		 1568}
1569
1570/* Create "default" multicast route to the interface */
1571
1572static void addrconf_add_mroute(struct net_device *dev)
1573{
86872cb5
TG		 1574 struct fib6_config cfg = {
1575 .fc_table = RT6_TABLE_LOCAL,
1576 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1577 .fc_ifindex = dev->ifindex,
1578 .fc_dst_len = 8,
1579 .fc_flags = RTF_UP,
1580 };
1581
1582 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1583
1584 ip6_route_add(&cfg);
1da177e4
LT		 1585}
1586
0be669bb 1587#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1588static void sit_route_add(struct net_device *dev)
1589{
86872cb5
TG		 1590 struct fib6_config cfg = {
1591 .fc_table = RT6_TABLE_MAIN,
1592 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1593 .fc_ifindex = dev->ifindex,
1594 .fc_dst_len = 96,
1595 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1596 };
1da177e4
LT		 1597
1598 /* prefix length - 96 bits "::d.d.d.d" */
86872cb5 1599 ip6_route_add(&cfg);
1da177e4 1600}
0be669bb 1601#endif
1da177e4
LT		 1602
1603static void addrconf_add_lroute(struct net_device *dev)
1604{
1605 struct in6_addr addr;
1606
1607 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1608 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1609}
1610
1611static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1612{
1613 struct inet6_dev *idev;
1614
1615 ASSERT_RTNL();
1616
1617 if ((idev = ipv6_find_idev(dev)) == NULL)
1618 return NULL;
1619
1620 /* Add default multicast route */
1621 addrconf_add_mroute(dev);
1622
1623 /* Add link local route */
1624 addrconf_add_lroute(dev);
1625 return idev;
1626}
1627
1628void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1629{
1630 struct prefix_info *pinfo;
1631 __u32 valid_lft;
1632 __u32 prefered_lft;
1633 int addr_type;
1634 unsigned long rt_expires;
1635 struct inet6_dev *in6_dev;
1636
1637 pinfo = (struct prefix_info *) opt;
1ab1457c 1638
1da177e4
LT		 1639 if (len < sizeof(struct prefix_info)) {
1640 ADBG(("addrconf: prefix option too short\n"));
1641 return;
1642 }
1ab1457c 1643
1da177e4
LT		 1644 /*
1645 * Validation checks ([ADDRCONF], page 19)
1646 */
1647
1648 addr_type = ipv6_addr_type(&pinfo->prefix);
1649
1650 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1651 return;
1652
1653 valid_lft = ntohl(pinfo->valid);
1654 prefered_lft = ntohl(pinfo->prefered);
1655
1656 if (prefered_lft > valid_lft) {
1657 if (net_ratelimit())
1658 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1659 return;
1660 }
1661
1662 in6_dev = in6_dev_get(dev);
1663
1664 if (in6_dev == NULL) {
1665 if (net_ratelimit())
1666 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1667 return;
1668 }
1669
1670 /*
1671 * Two things going on here:
1672 * 1) Add routes for on-link prefixes
1673 * 2) Configure prefixes with the auto flag set
1674 */
1675
1676 /* Avoid arithmetic overflow. Really, we could
1677 save rt_expires in seconds, likely valid_lft,
1678 but it would require division in fib gc, that it
1679 not good.
1680 */
1681 if (valid_lft >= 0x7FFFFFFF/HZ)
3dd4bc68 1682 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1da177e4 1683 else
3dd4bc68
YH		 1684 rt_expires = valid_lft * HZ;
1685
1686 /*
1687 * We convert this (in jiffies) to clock_t later.
1688 * Avoid arithmetic overflow there as well.
1689 * Overflow can happen only if HZ < USER_HZ.
1690 */
1691 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1692 rt_expires = 0x7FFFFFFF / USER_HZ;
1da177e4
LT		 1693
1694 if (pinfo->onlink) {
1695 struct rt6_info *rt;
1696 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1697
1698 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1699 if (rt->rt6i_flags&RTF_EXPIRES) {
1700 if (valid_lft == 0) {
e0a1ad73 1701 ip6_del_rt(rt);
1da177e4
LT		 1702 rt = NULL;
1703 } else {
3dd4bc68 1704 rt->rt6i_expires = jiffies + rt_expires;
1da177e4
LT		 1705 }
1706 }
1707 } else if (valid_lft) {
1708 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
3dd4bc68 1709 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1da177e4
LT		 1710 }
1711 if (rt)
1712 dst_release(&rt->u.dst);
1713 }
1714
1715 /* Try to figure out our local address for this prefix */
1716
1717 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1718 struct inet6_ifaddr * ifp;
1719 struct in6_addr addr;
1720 int create = 0, update_lft = 0;
1721
1722 if (pinfo->prefix_len == 64) {
1723 memcpy(&addr, &pinfo->prefix, 8);
1724 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1725 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1726 in6_dev_put(in6_dev);
1727 return;
1728 }
1729 goto ok;
1730 }
1731 if (net_ratelimit())
1732 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1733 pinfo->prefix_len);
1734 in6_dev_put(in6_dev);
1735 return;
1736
1737ok:
1738
1739 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1740
1741 if (ifp == NULL && valid_lft) {
1742 int max_addresses = in6_dev->cnf.max_addresses;
95c385b4
NH		 1743 u32 addr_flags = 0;
1744
1745#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1746 if (in6_dev->cnf.optimistic_dad &&
1747 !ipv6_devconf.forwarding)
1748 addr_flags = IFA_F_OPTIMISTIC;
1749#endif
1da177e4
LT		 1750
1751 /* Do not allow to create too much of autoconfigured
1752 * addresses; this would be too easy way to crash kernel.
1753 */
1754 if (!max_addresses ||
1755 ipv6_count_addresses(in6_dev) < max_addresses)
1756 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
95c385b4
NH		 1757 addr_type&IPV6_ADDR_SCOPE_MASK,
1758 addr_flags);
1da177e4
LT		 1759
1760 if (!ifp || IS_ERR(ifp)) {
1761 in6_dev_put(in6_dev);
1762 return;
1763 }
1764
1765 update_lft = create = 1;
1766 ifp->cstamp = jiffies;
1767 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1768 }
1769
1770 if (ifp) {
1771 int flags;
1772 unsigned long now;
1773#ifdef CONFIG_IPV6_PRIVACY
1774 struct inet6_ifaddr *ift;
1775#endif
1776 u32 stored_lft;
1777
1778 /* update lifetime (RFC2462 5.5.3 e) */
1779 spin_lock(&ifp->lock);
1780 now = jiffies;
1781 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1782 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1783 else
1784 stored_lft = 0;
1785 if (!update_lft && stored_lft) {
1786 if (valid_lft > MIN_VALID_LIFETIME ||
1787 valid_lft > stored_lft)
1788 update_lft = 1;
1789 else if (stored_lft <= MIN_VALID_LIFETIME) {
1790 /* valid_lft <= stored_lft is always true */
1791 /* XXX: IPsec */
1792 update_lft = 0;
1793 } else {
1794 valid_lft = MIN_VALID_LIFETIME;
1795 if (valid_lft < prefered_lft)
1796 prefered_lft = valid_lft;
1797 update_lft = 1;
1798 }
1799 }
1800
1801 if (update_lft) {
1802 ifp->valid_lft = valid_lft;
1803 ifp->prefered_lft = prefered_lft;
1804 ifp->tstamp = now;
1805 flags = ifp->flags;
1806 ifp->flags &= ~IFA_F_DEPRECATED;
1807 spin_unlock(&ifp->lock);
1808
1809 if (!(flags&IFA_F_TENTATIVE))
1810 ipv6_ifa_notify(0, ifp);
1811 } else
1812 spin_unlock(&ifp->lock);
1813
1814#ifdef CONFIG_IPV6_PRIVACY
1815 read_lock_bh(&in6_dev->lock);
1816 /* update all temporary addresses in the list */
1817 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1818 /*
1819 * When adjusting the lifetimes of an existing
1820 * temporary address, only lower the lifetimes.
1821 * Implementations must not increase the
1822 * lifetimes of an existing temporary address
1823 * when processing a Prefix Information Option.
1824 */
1825 spin_lock(&ift->lock);
1826 flags = ift->flags;
1827 if (ift->valid_lft > valid_lft &&
1828 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1829 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1830 if (ift->prefered_lft > prefered_lft &&
1831 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1832 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1833 spin_unlock(&ift->lock);
1834 if (!(flags&IFA_F_TENTATIVE))
1835 ipv6_ifa_notify(0, ift);
1836 }
1837
1838 if (create && in6_dev->cnf.use_tempaddr > 0) {
1839 /*
1840 * When a new public address is created as described in [ADDRCONF],
1841 * also create a new temporary address.
1842 */
1ab1457c 1843 read_unlock_bh(&in6_dev->lock);
1da177e4
LT		 1844 ipv6_create_tempaddr(ifp, NULL);
1845 } else {
1846 read_unlock_bh(&in6_dev->lock);
1847 }
1848#endif
1849 in6_ifa_put(ifp);
1850 addrconf_verify(0);
1851 }
1852 }
1853 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1854 in6_dev_put(in6_dev);
1855}
1856
1857/*
1858 * Set destination address.
1859 * Special case for SIT interfaces where we create a new "virtual"
1860 * device.
1861 */
1862int addrconf_set_dstaddr(void __user *arg)
1863{
1864 struct in6_ifreq ireq;
1865 struct net_device *dev;
1866 int err = -EINVAL;
1867
1868 rtnl_lock();
1869
1870 err = -EFAULT;
1871 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1872 goto err_exit;
1873
881d966b 1874 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1da177e4
LT		 1875
1876 err = -ENODEV;
1877 if (dev == NULL)
1878 goto err_exit;
1879
0be669bb 1880#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 1881 if (dev->type == ARPHRD_SIT) {
1882 struct ifreq ifr;
1883 mm_segment_t oldfs;
1884 struct ip_tunnel_parm p;
1885
1886 err = -EADDRNOTAVAIL;
1887 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1888 goto err_exit;
1889
1890 memset(&p, 0, sizeof(p));
1891 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1892 p.iph.saddr = 0;
1893 p.iph.version = 4;
1894 p.iph.ihl = 5;
1895 p.iph.protocol = IPPROTO_IPV6;
1896 p.iph.ttl = 64;
1897 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1898
1899 oldfs = get_fs(); set_fs(KERNEL_DS);
1900 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1901 set_fs(oldfs);
1902
1903 if (err == 0) {
1904 err = -ENOBUFS;
881d966b 1905 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1da177e4
LT		 1906 goto err_exit;
1907 err = dev_open(dev);
1908 }
1909 }
0be669bb 1910#endif
1da177e4
LT		 1911
1912err_exit:
1913 rtnl_unlock();
1914 return err;
1915}
1916
1917/*
1918 * Manual configuration of address on an interface
1919 */
0778769d 1920static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
55ebaef1 1921 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1da177e4
LT		 1922{
1923 struct inet6_ifaddr *ifp;
1924 struct inet6_dev *idev;
1925 struct net_device *dev;
1926 int scope;
46d48046 1927 u32 flags = RTF_EXPIRES;
1da177e4
LT		 1928
1929 ASSERT_RTNL();
1ab1457c 1930
0778769d
NT		 1931 /* check the lifetime */
1932 if (!valid_lft || prefered_lft > valid_lft)
1933 return -EINVAL;
1934
881d966b 1935 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4 1936 return -ENODEV;
1ab1457c 1937
1da177e4
LT		 1938 if ((idev = addrconf_add_dev(dev)) == NULL)
1939 return -ENOBUFS;
1940
1941 scope = ipv6_addr_scope(pfx);
1942
46d48046 1943 if (valid_lft == INFINITY_LIFE_TIME) {
0778769d 1944 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 1945 flags = 0;
1946 } else if (valid_lft >= 0x7FFFFFFF/HZ)
0778769d
NT		 1947 valid_lft = 0x7FFFFFFF/HZ;
1948
1949 if (prefered_lft == 0)
1950 ifa_flags |= IFA_F_DEPRECATED;
1951 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1952 (prefered_lft != INFINITY_LIFE_TIME))
1953 prefered_lft = 0x7FFFFFFF/HZ;
1954
1955 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1956
1da177e4 1957 if (!IS_ERR(ifp)) {
06aebfb7 1958 spin_lock_bh(&ifp->lock);
0778769d
NT		 1959 ifp->valid_lft = valid_lft;
1960 ifp->prefered_lft = prefered_lft;
1961 ifp->tstamp = jiffies;
06aebfb7 1962 spin_unlock_bh(&ifp->lock);
0778769d 1963
46d48046
YH		 1964 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1965 jiffies_to_clock_t(valid_lft * HZ), flags);
95c385b4
NH		 1966 /*
1967 * Note that section 3.1 of RFC 4429 indicates
1968 * that the Optimistic flag should not be set for
1969 * manually configured addresses
1970 */
1da177e4
LT		 1971 addrconf_dad_start(ifp, 0);
1972 in6_ifa_put(ifp);
0778769d 1973 addrconf_verify(0);
1da177e4
LT		 1974 return 0;
1975 }
1976
1977 return PTR_ERR(ifp);
1978}
1979
1980static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1981{
1982 struct inet6_ifaddr *ifp;
1983 struct inet6_dev *idev;
1984 struct net_device *dev;
1ab1457c 1985
881d966b 1986 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1da177e4
LT		 1987 return -ENODEV;
1988
1989 if ((idev = __in6_dev_get(dev)) == NULL)
1990 return -ENXIO;
1991
1992 read_lock_bh(&idev->lock);
1993 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1994 if (ifp->prefix_len == plen &&
1995 ipv6_addr_equal(pfx, &ifp->addr)) {
1996 in6_ifa_hold(ifp);
1997 read_unlock_bh(&idev->lock);
1ab1457c 1998
1da177e4
LT		 1999 ipv6_del_addr(ifp);
2000
2001 /* If the last address is deleted administratively,
2002 disable IPv6 on this interface.
2003 */
2004 if (idev->addr_list == NULL)
2005 addrconf_ifdown(idev->dev, 1);
2006 return 0;
2007 }
2008 }
2009 read_unlock_bh(&idev->lock);
2010 return -EADDRNOTAVAIL;
2011}
2012
2013
2014int addrconf_add_ifaddr(void __user *arg)
2015{
2016 struct in6_ifreq ireq;
2017 int err;
1ab1457c 2018
1da177e4
LT		 2019 if (!capable(CAP_NET_ADMIN))
2020 return -EPERM;
1ab1457c 2021
1da177e4
LT		 2022 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2023 return -EFAULT;
2024
2025 rtnl_lock();
0778769d 2026 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
55ebaef1 2027 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
1da177e4
LT		 2028 rtnl_unlock();
2029 return err;
2030}
2031
2032int addrconf_del_ifaddr(void __user *arg)
2033{
2034 struct in6_ifreq ireq;
2035 int err;
1ab1457c 2036
1da177e4
LT		 2037 if (!capable(CAP_NET_ADMIN))
2038 return -EPERM;
2039
2040 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2041 return -EFAULT;
2042
2043 rtnl_lock();
2044 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2045 rtnl_unlock();
2046 return err;
2047}
2048
0be669bb 2049#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2050static void sit_add_v4_addrs(struct inet6_dev *idev)
2051{
2052 struct inet6_ifaddr * ifp;
2053 struct in6_addr addr;
2054 struct net_device *dev;
2055 int scope;
2056
2057 ASSERT_RTNL();
2058
2059 memset(&addr, 0, sizeof(struct in6_addr));
2060 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2061
2062 if (idev->dev->flags&IFF_POINTOPOINT) {
2063 addr.s6_addr32[0] = htonl(0xfe800000);
2064 scope = IFA_LINK;
2065 } else {
2066 scope = IPV6_ADDR_COMPATv4;
2067 }
2068
2069 if (addr.s6_addr32[3]) {
2070 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2071 if (!IS_ERR(ifp)) {
2072 spin_lock_bh(&ifp->lock);
2073 ifp->flags &= ~IFA_F_TENTATIVE;
2074 spin_unlock_bh(&ifp->lock);
2075 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2076 in6_ifa_put(ifp);
2077 }
2078 return;
2079 }
2080
881d966b 2081 for_each_netdev(&init_net, dev) {
e5ed6399 2082 struct in_device * in_dev = __in_dev_get_rtnl(dev);
1da177e4
LT		 2083 if (in_dev && (dev->flags & IFF_UP)) {
2084 struct in_ifaddr * ifa;
2085
2086 int flag = scope;
2087
2088 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2089 int plen;
2090
2091 addr.s6_addr32[3] = ifa->ifa_local;
2092
2093 if (ifa->ifa_scope == RT_SCOPE_LINK)
2094 continue;
2095 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2096 if (idev->dev->flags&IFF_POINTOPOINT)
2097 continue;
2098 flag |= IFA_HOST;
2099 }
2100 if (idev->dev->flags&IFF_POINTOPOINT)
2101 plen = 64;
2102 else
2103 plen = 96;
2104
2105 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2106 IFA_F_PERMANENT);
2107 if (!IS_ERR(ifp)) {
2108 spin_lock_bh(&ifp->lock);
2109 ifp->flags &= ~IFA_F_TENTATIVE;
2110 spin_unlock_bh(&ifp->lock);
2111 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2112 in6_ifa_put(ifp);
2113 }
2114 }
2115 }
1ab1457c 2116 }
1da177e4 2117}
0be669bb 2118#endif
1da177e4
LT		 2119
2120static void init_loopback(struct net_device *dev)
2121{
2122 struct inet6_dev *idev;
2123 struct inet6_ifaddr * ifp;
2124
2125 /* ::1 */
2126
2127 ASSERT_RTNL();
2128
2129 if ((idev = ipv6_find_idev(dev)) == NULL) {
2130 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2131 return;
2132 }
2133
2134 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2135 if (!IS_ERR(ifp)) {
2136 spin_lock_bh(&ifp->lock);
2137 ifp->flags &= ~IFA_F_TENTATIVE;
2138 spin_unlock_bh(&ifp->lock);
2139 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2140 in6_ifa_put(ifp);
2141 }
2142}
2143
2144static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2145{
2146 struct inet6_ifaddr * ifp;
95c385b4
NH		 2147 u32 addr_flags = IFA_F_PERMANENT;
2148
2149#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2150 if (idev->cnf.optimistic_dad &&
2151 !ipv6_devconf.forwarding)
2152 addr_flags |= IFA_F_OPTIMISTIC;
2153#endif
1da177e4 2154
95c385b4
NH		 2155
2156 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
1da177e4 2157 if (!IS_ERR(ifp)) {
46d48046 2158 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
1da177e4
LT		 2159 addrconf_dad_start(ifp, 0);
2160 in6_ifa_put(ifp);
2161 }
2162}
2163
2164static void addrconf_dev_config(struct net_device *dev)
2165{
2166 struct in6_addr addr;
2167 struct inet6_dev * idev;
2168
2169 ASSERT_RTNL();
2170
74235a25
HX		 2171 if ((dev->type != ARPHRD_ETHER) &&
2172 (dev->type != ARPHRD_FDDI) &&
2173 (dev->type != ARPHRD_IEEE802_TR) &&
2174 (dev->type != ARPHRD_ARCNET) &&
2175 (dev->type != ARPHRD_INFINIBAND)) {
2176 /* Alas, we support only Ethernet autoconfiguration. */
2177 return;
2178 }
2179
1da177e4
LT		 2180 idev = addrconf_add_dev(dev);
2181 if (idev == NULL)
2182 return;
2183
2184 memset(&addr, 0, sizeof(struct in6_addr));
2185 addr.s6_addr32[0] = htonl(0xFE800000);
2186
2187 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2188 addrconf_add_linklocal(idev, &addr);
2189}
2190
0be669bb 2191#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2192static void addrconf_sit_config(struct net_device *dev)
2193{
2194 struct inet6_dev *idev;
2195
2196 ASSERT_RTNL();
2197
1ab1457c
YH		 2198 /*
2199 * Configure the tunnel with one of our IPv4
2200 * addresses... we should configure all of
1da177e4
LT		 2201 * our v4 addrs in the tunnel
2202 */
2203
2204 if ((idev = ipv6_find_idev(dev)) == NULL) {
2205 printk(KERN_DEBUG "init sit: add_dev failed\n");
2206 return;
2207 }
2208
2209 sit_add_v4_addrs(idev);
2210
2211 if (dev->flags&IFF_POINTOPOINT) {
2212 addrconf_add_mroute(dev);
2213 addrconf_add_lroute(dev);
2214 } else
2215 sit_route_add(dev);
2216}
0be669bb 2217#endif
1da177e4
LT		 2218
2219static inline int
2220ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2221{
2222 struct in6_addr lladdr;
2223
95c385b4 2224 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
1da177e4
LT		 2225 addrconf_add_linklocal(idev, &lladdr);
2226 return 0;
2227 }
2228 return -1;
2229}
2230
2231static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2232{
2233 struct net_device *link_dev;
2234
2235 /* first try to inherit the link-local address from the link device */
2236 if (idev->dev->iflink &&
881d966b 2237 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
1da177e4
LT		 2238 if (!ipv6_inherit_linklocal(idev, link_dev))
2239 return;
2240 }
2241 /* then try to inherit it from any device */
881d966b 2242 for_each_netdev(&init_net, link_dev) {
1da177e4
LT		 2243 if (!ipv6_inherit_linklocal(idev, link_dev))
2244 return;
2245 }
2246 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2247}
2248
2249/*
2250 * Autoconfigure tunnel with a link-local address so routing protocols,
2251 * DHCPv6, MLD etc. can be run over the virtual link
2252 */
2253
2254static void addrconf_ip6_tnl_config(struct net_device *dev)
2255{
2256 struct inet6_dev *idev;
2257
2258 ASSERT_RTNL();
2259
2260 if ((idev = addrconf_add_dev(dev)) == NULL) {
2261 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2262 return;
2263 }
2264 ip6_tnl_add_linklocal(idev);
1da177e4
LT		 2265}
2266
1ab1457c 2267static int addrconf_notify(struct notifier_block *this, unsigned long event,
1da177e4
LT		 2268 void * data)
2269{
2270 struct net_device *dev = (struct net_device *) data;
74235a25 2271 struct inet6_dev *idev = __in6_dev_get(dev);
c5e33bdd 2272 int run_pending = 0;
b217d616 2273 int err;
1da177e4 2274
e9dc8653
EB		 2275 if (dev->nd_net != &init_net)
2276 return NOTIFY_DONE;
2277
1da177e4 2278 switch(event) {
45ba9dd2 2279 case NETDEV_REGISTER:
74235a25 2280 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
45ba9dd2
YH		 2281 idev = ipv6_add_dev(dev);
2282 if (!idev)
b217d616 2283 return notifier_from_errno(-ENOMEM);
45ba9dd2
YH		 2284 }
2285 break;
1da177e4 2286 case NETDEV_UP:
3c21edbd 2287 case NETDEV_CHANGE:
c2edacf8
JV		 2288 if (dev->flags & IFF_SLAVE)
2289 break;
2290
3c21edbd 2291 if (event == NETDEV_UP) {
f24e3d65 2292 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2293 /* device is not ready yet. */
2294 printk(KERN_INFO
2295 "ADDRCONF(NETDEV_UP): %s: "
2296 "link is not ready\n",
2297 dev->name);
2298 break;
2299 }
99081049
KS		 2300
2301 if (idev)
2302 idev->if_flags |= IF_READY;
3c21edbd 2303 } else {
f24e3d65 2304 if (!addrconf_qdisc_ok(dev)) {
3c21edbd
YH		 2305 /* device is still not ready. */
2306 break;
2307 }
2308
2309 if (idev) {
2310 if (idev->if_flags & IF_READY) {
2311 /* device is already configured. */
2312 break;
2313 }
2314 idev->if_flags |= IF_READY;
2315 }
2316
2317 printk(KERN_INFO
2318 "ADDRCONF(NETDEV_CHANGE): %s: "
2319 "link becomes ready\n",
2320 dev->name);
2321
c5e33bdd 2322 run_pending = 1;
3c21edbd
YH		 2323 }
2324
1da177e4 2325 switch(dev->type) {
0be669bb 2326#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1da177e4
LT		 2327 case ARPHRD_SIT:
2328 addrconf_sit_config(dev);
2329 break;
0be669bb 2330#endif
1da177e4
LT		 2331 case ARPHRD_TUNNEL6:
2332 addrconf_ip6_tnl_config(dev);
2333 break;
2334 case ARPHRD_LOOPBACK:
2335 init_loopback(dev);
2336 break;
2337
2338 default:
2339 addrconf_dev_config(dev);
2340 break;
3ff50b79 2341 }
1da177e4 2342 if (idev) {
c5e33bdd
YH		 2343 if (run_pending)
2344 addrconf_dad_run(idev);
2345
1da177e4
LT		 2346 /* If the MTU changed during the interface down, when the
2347 interface up, the changed MTU must be reflected in the
2348 idev as well as routers.
2349 */
2350 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2351 rt6_mtu_change(dev, dev->mtu);
2352 idev->cnf.mtu6 = dev->mtu;
2353 }
2354 idev->tstamp = jiffies;
2355 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2356 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2357 stop IPv6 on this interface.
2358 */
2359 if (dev->mtu < IPV6_MIN_MTU)
2360 addrconf_ifdown(dev, event != NETDEV_DOWN);
2361 }
2362 break;
2363
2364 case NETDEV_CHANGEMTU:
2365 if ( idev && dev->mtu >= IPV6_MIN_MTU) {
2366 rt6_mtu_change(dev, dev->mtu);
2367 idev->cnf.mtu6 = dev->mtu;
2368 break;
2369 }
2370
2371 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2372
2373 case NETDEV_DOWN:
2374 case NETDEV_UNREGISTER:
2375 /*
2376 * Remove all addresses from this interface.
2377 */
2378 addrconf_ifdown(dev, event != NETDEV_DOWN);
2379 break;
3c21edbd 2380
1da177e4 2381 case NETDEV_CHANGENAME:
1da177e4 2382 if (idev) {
5632c515
SH		 2383 snmp6_unregister_dev(idev);
2384#ifdef CONFIG_SYSCTL
1da177e4
LT		 2385 addrconf_sysctl_unregister(&idev->cnf);
2386 neigh_sysctl_unregister(idev->nd_parms);
2387 neigh_sysctl_register(dev, idev->nd_parms,
2388 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2389 &ndisc_ifinfo_sysctl_change,
2390 NULL);
2391 addrconf_sysctl_register(idev, &idev->cnf);
1da177e4 2392#endif
b217d616
HX		 2393 err = snmp6_register_dev(idev);
2394 if (err)
2395 return notifier_from_errno(err);
5632c515 2396 }
1da177e4 2397 break;
3ff50b79 2398 }
1da177e4
LT		 2399
2400 return NOTIFY_OK;
2401}
2402
2403/*
2404 * addrconf module should be notified of a device going up
2405 */
2406static struct notifier_block ipv6_dev_notf = {
2407 .notifier_call = addrconf_notify,
2408 .priority = 0
2409};
2410
2411static int addrconf_ifdown(struct net_device *dev, int how)
2412{
2413 struct inet6_dev *idev;
2414 struct inet6_ifaddr *ifa, **bifa;
2415 int i;
2416
2417 ASSERT_RTNL();
2418
2774c7ab 2419 if (dev == init_net.loopback_dev && how == 1)
1da177e4
LT		 2420 how = 0;
2421
2422 rt6_ifdown(dev);
2423 neigh_ifdown(&nd_tbl, dev);
2424
2425 idev = __in6_dev_get(dev);
2426 if (idev == NULL)
2427 return -ENODEV;
2428
2429 /* Step 1: remove reference to ipv6 device from parent device.
1ab1457c 2430 Do not dev_put!
1da177e4
LT		 2431 */
2432 if (how == 1) {
1da177e4 2433 idev->dead = 1;
8814c4b5
YH		 2434
2435 /* protected by rtnl_lock */
2436 rcu_assign_pointer(dev->ip6_ptr, NULL);
1da177e4
LT		 2437
2438 /* Step 1.5: remove snmp6 entry */
2439 snmp6_unregister_dev(idev);
2440
2441 }
2442
2443 /* Step 2: clear hash table */
2444 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2445 bifa = &inet6_addr_lst[i];
2446
2447 write_lock_bh(&addrconf_hash_lock);
2448 while ((ifa = *bifa) != NULL) {
2449 if (ifa->idev == idev) {
2450 *bifa = ifa->lst_next;
2451 ifa->lst_next = NULL;
2452 addrconf_del_timer(ifa);
2453 in6_ifa_put(ifa);
2454 continue;
2455 }
2456 bifa = &ifa->lst_next;
2457 }
2458 write_unlock_bh(&addrconf_hash_lock);
2459 }
2460
2461 write_lock_bh(&idev->lock);
2462
2463 /* Step 3: clear flags for stateless addrconf */
2464 if (how != 1)
3c21edbd 2465 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
1da177e4
LT		 2466
2467 /* Step 4: clear address list */
2468#ifdef CONFIG_IPV6_PRIVACY
2469 if (how == 1 && del_timer(&idev->regen_timer))
2470 in6_dev_put(idev);
2471
2472 /* clear tempaddr list */
2473 while ((ifa = idev->tempaddr_list) != NULL) {
2474 idev->tempaddr_list = ifa->tmp_next;
2475 ifa->tmp_next = NULL;
2476 ifa->dead = 1;
2477 write_unlock_bh(&idev->lock);
2478 spin_lock_bh(&ifa->lock);
2479
2480 if (ifa->ifpub) {
2481 in6_ifa_put(ifa->ifpub);
2482 ifa->ifpub = NULL;
2483 }
2484 spin_unlock_bh(&ifa->lock);
2485 in6_ifa_put(ifa);
2486 write_lock_bh(&idev->lock);
2487 }
2488#endif
2489 while ((ifa = idev->addr_list) != NULL) {
2490 idev->addr_list = ifa->if_next;
2491 ifa->if_next = NULL;
2492 ifa->dead = 1;
2493 addrconf_del_timer(ifa);
2494 write_unlock_bh(&idev->lock);
2495
2496 __ipv6_ifa_notify(RTM_DELADDR, ifa);
063ed369 2497 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
1da177e4
LT		 2498 in6_ifa_put(ifa);
2499
2500 write_lock_bh(&idev->lock);
2501 }
2502 write_unlock_bh(&idev->lock);
2503
2504 /* Step 5: Discard multicast list */
2505
2506 if (how == 1)
2507 ipv6_mc_destroy_dev(idev);
2508 else
2509 ipv6_mc_down(idev);
2510
1da177e4 2511 idev->tstamp = jiffies;
1ab1457c 2512
1da177e4
LT		 2513 /* Shot the device (if unregistered) */
2514
2515 if (how == 1) {
2516#ifdef CONFIG_SYSCTL
2517 addrconf_sysctl_unregister(&idev->cnf);
2518 neigh_sysctl_unregister(idev->nd_parms);
2519#endif
2520 neigh_parms_release(&nd_tbl, idev->nd_parms);
2521 neigh_ifdown(&nd_tbl, dev);
2522 in6_dev_put(idev);
2523 }
2524 return 0;
2525}
2526
2527static void addrconf_rs_timer(unsigned long data)
2528{
2529 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2530
2531 if (ifp->idev->cnf.forwarding)
2532 goto out;
2533
2534 if (ifp->idev->if_flags & IF_RA_RCVD) {
2535 /*
2536 * Announcement received after solicitation
2537 * was sent
2538 */
2539 goto out;
2540 }
2541
2542 spin_lock(&ifp->lock);
2543 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2544 struct in6_addr all_routers;
2545
2546 /* The wait after the last probe can be shorter */
2547 addrconf_mod_timer(ifp, AC_RS,
2548 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2549 ifp->idev->cnf.rtr_solicit_delay :
2550 ifp->idev->cnf.rtr_solicit_interval);
2551 spin_unlock(&ifp->lock);
2552
2553 ipv6_addr_all_routers(&all_routers);
2554
2555 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2556 } else {
2557 spin_unlock(&ifp->lock);
2558 /*
2559 * Note: we do not support deprecated "all on-link"
2560 * assumption any longer.
2561 */
2562 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2563 ifp->idev->dev->name);
2564 }
2565
2566out:
2567 in6_ifa_put(ifp);
2568}
2569
2570/*
2571 * Duplicate Address Detection
2572 */
3c21edbd
YH		 2573static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2574{
2575 unsigned long rand_num;
2576 struct inet6_dev *idev = ifp->idev;
2577
95c385b4
NH		 2578 if (ifp->flags & IFA_F_OPTIMISTIC)
2579 rand_num = 0;
2580 else
2581 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2582
3c21edbd
YH		 2583 ifp->probes = idev->cnf.dad_transmits;
2584 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2585}
2586
e431b8c0 2587static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
1da177e4
LT		 2588{
2589 struct inet6_dev *idev = ifp->idev;
2590 struct net_device *dev = idev->dev;
1da177e4
LT		 2591
2592 addrconf_join_solict(dev, &ifp->addr);
2593
1da177e4 2594 net_srandom(ifp->addr.s6_addr32[3]);
1da177e4
LT		 2595
2596 read_lock_bh(&idev->lock);
2597 if (ifp->dead)
2598 goto out;
2599 spin_lock_bh(&ifp->lock);
2600
2601 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
55ebaef1
NT		 2602 !(ifp->flags&IFA_F_TENTATIVE) ||
2603 ifp->flags & IFA_F_NODAD) {
95c385b4 2604 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2605 spin_unlock_bh(&ifp->lock);
2606 read_unlock_bh(&idev->lock);
2607
2608 addrconf_dad_completed(ifp);
2609 return;
2610 }
2611
6732bade 2612 if (!(idev->if_flags & IF_READY)) {
3dd3bf83 2613 spin_unlock_bh(&ifp->lock);
6732bade 2614 read_unlock_bh(&idev->lock);
3c21edbd
YH		 2615 /*
2616 * If the defice is not ready:
2617 * - keep it tentative if it is a permanent address.
2618 * - otherwise, kill it.
2619 */
2620 in6_ifa_hold(ifp);
2621 addrconf_dad_stop(ifp);
6732bade 2622 return;
3c21edbd 2623 }
95c385b4
NH		 2624
2625 /*
2626 * Optimistic nodes can start receiving
2627 * Frames right away
2628 */
2629 if(ifp->flags & IFA_F_OPTIMISTIC)
2630 ip6_ins_rt(ifp->rt);
2631
6732bade
YH		 2632 addrconf_dad_kick(ifp);
2633 spin_unlock_bh(&ifp->lock);
1da177e4
LT		 2634out:
2635 read_unlock_bh(&idev->lock);
2636}
2637
2638static void addrconf_dad_timer(unsigned long data)
2639{
2640 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2641 struct inet6_dev *idev = ifp->idev;
2642 struct in6_addr unspec;
2643 struct in6_addr mcaddr;
2644
2645 read_lock_bh(&idev->lock);
2646 if (idev->dead) {
2647 read_unlock_bh(&idev->lock);
2648 goto out;
2649 }
2650 spin_lock_bh(&ifp->lock);
2651 if (ifp->probes == 0) {
2652 /*
2653 * DAD was successful
2654 */
2655
95c385b4 2656 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
1da177e4
LT		 2657 spin_unlock_bh(&ifp->lock);
2658 read_unlock_bh(&idev->lock);
2659
2660 addrconf_dad_completed(ifp);
2661
2662 goto out;
2663 }
2664
2665 ifp->probes--;
2666 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2667 spin_unlock_bh(&ifp->lock);
2668 read_unlock_bh(&idev->lock);
2669
2670 /* send a neighbour solicitation for our addr */
2671 memset(&unspec, 0, sizeof(unspec));
2672 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2673 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2674out:
2675 in6_ifa_put(ifp);
2676}
2677
2678static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2679{
2680 struct net_device * dev = ifp->idev->dev;
2681
2682 /*
2683 * Configure the address for reception. Now it is valid.
2684 */
2685
2686 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2687
2688 /* If added prefix is link local and forwarding is off,
2689 start sending router solicitations.
2690 */
2691
2692 if (ifp->idev->cnf.forwarding == 0 &&
2693 ifp->idev->cnf.rtr_solicits > 0 &&
2694 (dev->flags&IFF_LOOPBACK) == 0 &&
2695 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2696 struct in6_addr all_routers;
2697
2698 ipv6_addr_all_routers(&all_routers);
2699
2700 /*
2701 * If a host as already performed a random delay
2702 * [...] as part of DAD [...] there is no need
2703 * to delay again before sending the first RS
2704 */
2705 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2706
2707 spin_lock_bh(&ifp->lock);
2708 ifp->probes = 1;
2709 ifp->idev->if_flags |= IF_RS_SENT;
2710 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2711 spin_unlock_bh(&ifp->lock);
2712 }
2713}
2714
c5e33bdd
YH		 2715static void addrconf_dad_run(struct inet6_dev *idev) {
2716 struct inet6_ifaddr *ifp;
2717
2718 read_lock_bh(&idev->lock);
2719 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2720 spin_lock_bh(&ifp->lock);
2721 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2722 spin_unlock_bh(&ifp->lock);
2723 continue;
2724 }
2725 spin_unlock_bh(&ifp->lock);
2726 addrconf_dad_kick(ifp);
2727 }
2728 read_unlock_bh(&idev->lock);
2729}
2730
1da177e4
LT		 2731#ifdef CONFIG_PROC_FS
2732struct if6_iter_state {
2733 int bucket;
2734};
2735
2736static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2737{
2738 struct inet6_ifaddr *ifa = NULL;
2739 struct if6_iter_state *state = seq->private;
2740
2741 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2742 ifa = inet6_addr_lst[state->bucket];
2743 if (ifa)
2744 break;
2745 }
2746 return ifa;
2747}
2748
2749static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2750{
2751 struct if6_iter_state *state = seq->private;
2752
2753 ifa = ifa->lst_next;
2754try_again:
2755 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2756 ifa = inet6_addr_lst[state->bucket];
2757 goto try_again;
2758 }
2759 return ifa;
2760}
2761
2762static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2763{
2764 struct inet6_ifaddr *ifa = if6_get_first(seq);
2765
2766 if (ifa)
2767 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2768 --pos;
2769 return pos ? NULL : ifa;
2770}
2771
2772static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2773{
2774 read_lock_bh(&addrconf_hash_lock);
2775 return if6_get_idx(seq, *pos);
2776}
2777
2778static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2779{
2780 struct inet6_ifaddr *ifa;
2781
2782 ifa = if6_get_next(seq, v);
2783 ++*pos;
2784 return ifa;
2785}
2786
2787static void if6_seq_stop(struct seq_file *seq, void *v)
2788{
2789 read_unlock_bh(&addrconf_hash_lock);
2790}
2791
2792static int if6_seq_show(struct seq_file *seq, void *v)
2793{
2794 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2795 seq_printf(seq,
9343e79a 2796 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
1da177e4
LT		 2797 NIP6(ifp->addr),
2798 ifp->idev->dev->ifindex,
2799 ifp->prefix_len,
2800 ifp->scope,
2801 ifp->flags,
2802 ifp->idev->dev->name);
2803 return 0;
2804}
2805
56b3d975 2806static const struct seq_operations if6_seq_ops = {
1da177e4
LT		 2807 .start = if6_seq_start,
2808 .next = if6_seq_next,
2809 .show = if6_seq_show,
2810 .stop = if6_seq_stop,
2811};
2812
2813static int if6_seq_open(struct inode *inode, struct file *file)
2814{
cf7732e4
PE		 2815 return seq_open_private(file, &if6_seq_ops,
2816 sizeof(struct if6_iter_state));
1da177e4
LT		 2817}
2818
9a32144e 2819static const struct file_operations if6_fops = {
1da177e4
LT		 2820 .owner = THIS_MODULE,
2821 .open = if6_seq_open,
2822 .read = seq_read,
2823 .llseek = seq_lseek,
2824 .release = seq_release_private,
2825};
2826
2827int __init if6_proc_init(void)
2828{
457c4cbc 2829 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
1da177e4
LT		 2830 return -ENOMEM;
2831 return 0;
2832}
2833
2834void if6_proc_exit(void)
2835{
457c4cbc 2836 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 2837}
2838#endif /* CONFIG_PROC_FS */
2839
59fbb3a6 2840#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3b9f9a1c
NT		 2841/* Check if address is a home address configured on any interface. */
2842int ipv6_chk_home_addr(struct in6_addr *addr)
2843{
2844 int ret = 0;
2845 struct inet6_ifaddr * ifp;
2846 u8 hash = ipv6_addr_hash(addr);
2847 read_lock_bh(&addrconf_hash_lock);
2848 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2849 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2850 (ifp->flags & IFA_F_HOMEADDRESS)) {
2851 ret = 1;
2852 break;
2853 }
2854 }
2855 read_unlock_bh(&addrconf_hash_lock);
2856 return ret;
2857}
2858#endif
2859
1da177e4
LT		 2860/*
2861 * Periodic address status verification
2862 */
2863
2864static void addrconf_verify(unsigned long foo)
2865{
2866 struct inet6_ifaddr *ifp;
2867 unsigned long now, next;
2868 int i;
2869
2870 spin_lock_bh(&addrconf_verify_lock);
2871 now = jiffies;
2872 next = now + ADDR_CHECK_FREQUENCY;
2873
2874 del_timer(&addr_chk_timer);
2875
2876 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2877
2878restart:
5d5780df 2879 read_lock(&addrconf_hash_lock);
1da177e4
LT		 2880 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2881 unsigned long age;
2882#ifdef CONFIG_IPV6_PRIVACY
2883 unsigned long regen_advance;
2884#endif
2885
2886 if (ifp->flags & IFA_F_PERMANENT)
2887 continue;
2888
2889 spin_lock(&ifp->lock);
2890 age = (now - ifp->tstamp) / HZ;
2891
2892#ifdef CONFIG_IPV6_PRIVACY
1ab1457c
YH		 2893 regen_advance = ifp->idev->cnf.regen_max_retry *
2894 ifp->idev->cnf.dad_transmits *
1da177e4
LT		 2895 ifp->idev->nd_parms->retrans_time / HZ;
2896#endif
2897
8f27ebb9
YH		 2898 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2899 age >= ifp->valid_lft) {
1da177e4
LT		 2900 spin_unlock(&ifp->lock);
2901 in6_ifa_hold(ifp);
5d5780df 2902 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2903 ipv6_del_addr(ifp);
2904 goto restart;
8f27ebb9
YH		 2905 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2906 spin_unlock(&ifp->lock);
2907 continue;
1da177e4
LT		 2908 } else if (age >= ifp->prefered_lft) {
2909 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2910 int deprecate = 0;
2911
2912 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2913 deprecate = 1;
2914 ifp->flags |= IFA_F_DEPRECATED;
2915 }
2916
2917 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2918 next = ifp->tstamp + ifp->valid_lft * HZ;
2919
2920 spin_unlock(&ifp->lock);
2921
2922 if (deprecate) {
2923 in6_ifa_hold(ifp);
5d5780df 2924 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2925
2926 ipv6_ifa_notify(0, ifp);
2927 in6_ifa_put(ifp);
2928 goto restart;
2929 }
2930#ifdef CONFIG_IPV6_PRIVACY
2931 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2932 !(ifp->flags&IFA_F_TENTATIVE)) {
2933 if (age >= ifp->prefered_lft - regen_advance) {
2934 struct inet6_ifaddr *ifpub = ifp->ifpub;
2935 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2936 next = ifp->tstamp + ifp->prefered_lft * HZ;
2937 if (!ifp->regen_count && ifpub) {
2938 ifp->regen_count++;
2939 in6_ifa_hold(ifp);
2940 in6_ifa_hold(ifpub);
2941 spin_unlock(&ifp->lock);
5d5780df 2942 read_unlock(&addrconf_hash_lock);
291d809b
HY		 2943 spin_lock(&ifpub->lock);
2944 ifpub->regen_count = 0;
2945 spin_unlock(&ifpub->lock);
1da177e4
LT		 2946 ipv6_create_tempaddr(ifpub, ifp);
2947 in6_ifa_put(ifpub);
2948 in6_ifa_put(ifp);
2949 goto restart;
2950 }
2951 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2952 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2953 spin_unlock(&ifp->lock);
2954#endif
2955 } else {
2956 /* ifp->prefered_lft <= ifp->valid_lft */
2957 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2958 next = ifp->tstamp + ifp->prefered_lft * HZ;
2959 spin_unlock(&ifp->lock);
2960 }
2961 }
5d5780df 2962 read_unlock(&addrconf_hash_lock);
1da177e4
LT		 2963 }
2964
2965 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2966 add_timer(&addr_chk_timer);
2967 spin_unlock_bh(&addrconf_verify_lock);
2968}
2969
461d8837
TG		 2970static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2971{
2972 struct in6_addr *pfx = NULL;
2973
2974 if (addr)
2975 pfx = nla_data(addr);
2976
2977 if (local) {
2978 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2979 pfx = NULL;
2980 else
2981 pfx = nla_data(local);
2982 }
2983
2984 return pfx;
2985}
2986
ef7c79ed 2987static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
461d8837
TG		 2988 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2989 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2990 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2991};
2992
1da177e4
LT		 2993static int
2994inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2995{
b933f716
TG		 2996 struct ifaddrmsg *ifm;
2997 struct nlattr *tb[IFA_MAX+1];
1da177e4 2998 struct in6_addr *pfx;
b933f716 2999 int err;
1da177e4 3000
b933f716
TG		 3001 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3002 if (err < 0)
3003 return err;
3004
3005 ifm = nlmsg_data(nlh);
3006 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3007 if (pfx == NULL)
3008 return -EINVAL;
3009
3010 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3011}
3012
55ebaef1
NT		 3013static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3014 u32 prefered_lft, u32 valid_lft)
081bba5b 3015{
46d48046
YH		 3016 u32 flags = RTF_EXPIRES;
3017
081bba5b
NT		 3018 if (!valid_lft || (prefered_lft > valid_lft))
3019 return -EINVAL;
3020
46d48046 3021 if (valid_lft == INFINITY_LIFE_TIME) {
55ebaef1 3022 ifa_flags |= IFA_F_PERMANENT;
46d48046
YH		 3023 flags = 0;
3024 } else if (valid_lft >= 0x7FFFFFFF/HZ)
081bba5b
NT		 3025 valid_lft = 0x7FFFFFFF/HZ;
3026
3027 if (prefered_lft == 0)
55ebaef1 3028 ifa_flags |= IFA_F_DEPRECATED;
081bba5b
NT		 3029 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3030 (prefered_lft != INFINITY_LIFE_TIME))
3031 prefered_lft = 0x7FFFFFFF/HZ;
3032
3033 spin_lock_bh(&ifp->lock);
3b9f9a1c 3034 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
081bba5b
NT		 3035 ifp->tstamp = jiffies;
3036 ifp->valid_lft = valid_lft;
3037 ifp->prefered_lft = prefered_lft;
3038
3039 spin_unlock_bh(&ifp->lock);
3040 if (!(ifp->flags&IFA_F_TENTATIVE))
3041 ipv6_ifa_notify(0, ifp);
081bba5b 3042
46d48046
YH		 3043 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3044 jiffies_to_clock_t(valid_lft * HZ), flags);
081bba5b
NT		 3045 addrconf_verify(0);
3046
3047 return 0;
3048}
3049
1da177e4
LT		 3050static int
3051inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3052{
461d8837
TG		 3053 struct ifaddrmsg *ifm;
3054 struct nlattr *tb[IFA_MAX+1];
1da177e4 3055 struct in6_addr *pfx;
7198f8ce
TG		 3056 struct inet6_ifaddr *ifa;
3057 struct net_device *dev;
55ebaef1
NT		 3058 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3059 u8 ifa_flags;
461d8837 3060 int err;
1da177e4 3061
461d8837
TG		 3062 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3063 if (err < 0)
3064 return err;
3065
3066 ifm = nlmsg_data(nlh);
3067 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
1da177e4
LT		 3068 if (pfx == NULL)
3069 return -EINVAL;
3070
461d8837 3071 if (tb[IFA_CACHEINFO]) {
0778769d 3072 struct ifa_cacheinfo *ci;
461d8837
TG		 3073
3074 ci = nla_data(tb[IFA_CACHEINFO]);
0778769d 3075 valid_lft = ci->ifa_valid;
461d8837
TG		 3076 preferred_lft = ci->ifa_prefered;
3077 } else {
3078 preferred_lft = INFINITY_LIFE_TIME;
3079 valid_lft = INFINITY_LIFE_TIME;
0778769d
NT		 3080 }
3081
881d966b 3082 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
7198f8ce
TG		 3083 if (dev == NULL)
3084 return -ENODEV;
3085
55ebaef1 3086 /* We ignore other flags so far. */
3b9f9a1c 3087 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
55ebaef1 3088
7198f8ce
TG		 3089 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3090 if (ifa == NULL) {
3091 /*
3092 * It would be best to check for !NLM_F_CREATE here but
3093 * userspace alreay relies on not having to provide this.
3094 */
3095 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
55ebaef1 3096 ifa_flags, preferred_lft, valid_lft);
081bba5b
NT		 3097 }
3098
7198f8ce
TG		 3099 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3100 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3101 err = -EEXIST;
3102 else
55ebaef1 3103 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
7198f8ce
TG		 3104
3105 in6_ifa_put(ifa);
3106
3107 return err;
1da177e4
LT		 3108}
3109
101bb229
TG		 3110static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3111 u8 scope, int ifindex)
3112{
3113 struct ifaddrmsg *ifm;
3114
3115 ifm = nlmsg_data(nlh);
3116 ifm->ifa_family = AF_INET6;
3117 ifm->ifa_prefixlen = prefixlen;
3118 ifm->ifa_flags = flags;
3119 ifm->ifa_scope = scope;
3120 ifm->ifa_index = ifindex;
3121}
3122
85486af0
TG		 3123static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3124 unsigned long tstamp, u32 preferred, u32 valid)
3125{
3126 struct ifa_cacheinfo ci;
3127
3128 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3129 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3130 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3131 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3132 ci.ifa_prefered = preferred;
3133 ci.ifa_valid = valid;
3134
3135 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3136}
3137
101bb229
TG		 3138static inline int rt_scope(int ifa_scope)
3139{
3140 if (ifa_scope & IFA_HOST)
3141 return RT_SCOPE_HOST;
3142 else if (ifa_scope & IFA_LINK)
3143 return RT_SCOPE_LINK;
3144 else if (ifa_scope & IFA_SITE)
3145 return RT_SCOPE_SITE;
3146 else
3147 return RT_SCOPE_UNIVERSE;
3148}
3149
0ab6803b
TG		 3150static inline int inet6_ifaddr_msgsize(void)
3151{
339bf98f
TG		 3152 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3153 + nla_total_size(16) /* IFA_ADDRESS */
3154 + nla_total_size(sizeof(struct ifa_cacheinfo));
0ab6803b 3155}
c5396a31 3156
1da177e4 3157static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
b6544c0b 3158 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3159{
1da177e4 3160 struct nlmsghdr *nlh;
85486af0 3161 u32 preferred, valid;
1da177e4 3162
0ab6803b
TG		 3163 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3164 if (nlh == NULL)
26932566 3165 return -EMSGSIZE;
0ab6803b 3166
101bb229
TG		 3167 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3168 ifa->idev->dev->ifindex);
3169
1da177e4 3170 if (!(ifa->flags&IFA_F_PERMANENT)) {
85486af0
TG		 3171 preferred = ifa->prefered_lft;
3172 valid = ifa->valid_lft;
3173 if (preferred != INFINITY_LIFE_TIME) {
1da177e4 3174 long tval = (jiffies - ifa->tstamp)/HZ;
85486af0
TG		 3175 preferred -= tval;
3176 if (valid != INFINITY_LIFE_TIME)
3177 valid -= tval;
1da177e4
LT		 3178 }
3179 } else {
85486af0
TG		 3180 preferred = INFINITY_LIFE_TIME;
3181 valid = INFINITY_LIFE_TIME;
3182 }
3183
0ab6803b 3184 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
26932566
PM		 3185 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3186 nlmsg_cancel(skb, nlh);
3187 return -EMSGSIZE;
3188 }
1da177e4 3189
0ab6803b 3190 return nlmsg_end(skb, nlh);
1da177e4
LT		 3191}
3192
3193static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
e431b8c0 3194 u32 pid, u32 seq, int event, u16 flags)
1da177e4 3195{
1da177e4 3196 struct nlmsghdr *nlh;
101bb229
TG		 3197 u8 scope = RT_SCOPE_UNIVERSE;
3198 int ifindex = ifmca->idev->dev->ifindex;
3199
3200 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3201 scope = RT_SCOPE_SITE;
1da177e4 3202
0ab6803b
TG		 3203 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3204 if (nlh == NULL)
26932566 3205 return -EMSGSIZE;
85486af0 3206
0ab6803b
TG		 3207 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3208 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3209 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
26932566
PM		 3210 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3211 nlmsg_cancel(skb, nlh);
3212 return -EMSGSIZE;
3213 }
85486af0 3214
0ab6803b 3215 return nlmsg_end(skb, nlh);
1da177e4
LT		 3216}
3217
3218static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
b6544c0b 3219 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3220{
1da177e4 3221 struct nlmsghdr *nlh;
101bb229
TG		 3222 u8 scope = RT_SCOPE_UNIVERSE;
3223 int ifindex = ifaca->aca_idev->dev->ifindex;
3224
3225 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3226 scope = RT_SCOPE_SITE;
1da177e4 3227
0ab6803b
TG		 3228 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3229 if (nlh == NULL)
26932566 3230 return -EMSGSIZE;
85486af0 3231
0ab6803b
TG		 3232 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3233 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3234 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
26932566
PM		 3235 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3236 nlmsg_cancel(skb, nlh);
3237 return -EMSGSIZE;
3238 }
1da177e4 3239
0ab6803b 3240 return nlmsg_end(skb, nlh);
1da177e4
LT		 3241}
3242
3243enum addr_type_t
3244{
3245 UNICAST_ADDR,
3246 MULTICAST_ADDR,
3247 ANYCAST_ADDR,
3248};
3249
3250static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3251 enum addr_type_t type)
3252{
3253 int idx, ip_idx;
3254 int s_idx, s_ip_idx;
3255 int err = 1;
3256 struct net_device *dev;
3257 struct inet6_dev *idev = NULL;
3258 struct inet6_ifaddr *ifa;
3259 struct ifmcaddr6 *ifmca;
3260 struct ifacaddr6 *ifaca;
3261
3262 s_idx = cb->args[0];
3263 s_ip_idx = ip_idx = cb->args[1];
1ab1457c 3264
7562f876 3265 idx = 0;
881d966b 3266 for_each_netdev(&init_net, dev) {
1da177e4 3267 if (idx < s_idx)
7562f876 3268 goto cont;
1da177e4
LT		 3269 if (idx > s_idx)
3270 s_ip_idx = 0;
3271 ip_idx = 0;
3272 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3273 goto cont;
1da177e4
LT		 3274 read_lock_bh(&idev->lock);
3275 switch (type) {
3276 case UNICAST_ADDR:
ae9cda5d 3277 /* unicast address incl. temp addr */
1da177e4
LT		 3278 for (ifa = idev->addr_list; ifa;
3279 ifa = ifa->if_next, ip_idx++) {
3280 if (ip_idx < s_ip_idx)
3281 continue;
1ab1457c
YH		 3282 if ((err = inet6_fill_ifaddr(skb, ifa,
3283 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3284 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3285 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3286 goto done;
3287 }
1da177e4
LT		 3288 break;
3289 case MULTICAST_ADDR:
3290 /* multicast address */
1ab1457c 3291 for (ifmca = idev->mc_list; ifmca;
1da177e4
LT		 3292 ifmca = ifmca->next, ip_idx++) {
3293 if (ip_idx < s_ip_idx)
3294 continue;
1ab1457c
YH		 3295 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3296 NETLINK_CB(cb->skb).pid,
b6544c0b
JHS		 3297 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3298 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3299 goto done;
3300 }
3301 break;
3302 case ANYCAST_ADDR:
3303 /* anycast address */
3304 for (ifaca = idev->ac_list; ifaca;
3305 ifaca = ifaca->aca_next, ip_idx++) {
3306 if (ip_idx < s_ip_idx)
3307 continue;
1ab1457c
YH		 3308 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3309 NETLINK_CB(cb->skb).pid,
b6544c0b 3310 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
1ab1457c 3311 NLM_F_MULTI)) <= 0)
1da177e4
LT		 3312 goto done;
3313 }
3314 break;
3315 default:
3316 break;
3317 }
3318 read_unlock_bh(&idev->lock);
3319 in6_dev_put(idev);
7562f876
PE		 3320cont:
3321 idx++;
1da177e4
LT		 3322 }
3323done:
3324 if (err <= 0) {
3325 read_unlock_bh(&idev->lock);
3326 in6_dev_put(idev);
3327 }
1da177e4
LT		 3328 cb->args[0] = idx;
3329 cb->args[1] = ip_idx;
3330 return skb->len;
3331}
3332
3333static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3334{
3335 enum addr_type_t type = UNICAST_ADDR;
3336 return inet6_dump_addr(skb, cb, type);
3337}
3338
3339static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3340{
3341 enum addr_type_t type = MULTICAST_ADDR;
3342 return inet6_dump_addr(skb, cb, type);
3343}
3344
3345
3346static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3347{
3348 enum addr_type_t type = ANYCAST_ADDR;
3349 return inet6_dump_addr(skb, cb, type);
3350}
3351
1b29fc2c
TG		 3352static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3353 void *arg)
6c223828 3354{
1b29fc2c
TG		 3355 struct ifaddrmsg *ifm;
3356 struct nlattr *tb[IFA_MAX+1];
6c223828
NT		 3357 struct in6_addr *addr = NULL;
3358 struct net_device *dev = NULL;
3359 struct inet6_ifaddr *ifa;
3360 struct sk_buff *skb;
6c223828
NT		 3361 int err;
3362
1b29fc2c
TG		 3363 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3364 if (err < 0)
3365 goto errout;
3366
3367 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3368 if (addr == NULL) {
3369 err = -EINVAL;
3370 goto errout;
6c223828 3371 }
6c223828 3372
1b29fc2c 3373 ifm = nlmsg_data(nlh);
6c223828 3374 if (ifm->ifa_index)
881d966b 3375 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
6c223828 3376
1b29fc2c
TG		 3377 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3378 err = -EADDRNOTAVAIL;
3379 goto errout;
3380 }
6c223828 3381
0ab6803b 3382 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
6c223828 3383 err = -ENOBUFS;
1b29fc2c 3384 goto errout_ifa;
6c223828
NT		 3385 }
3386
6c223828
NT		 3387 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3388 nlh->nlmsg_seq, RTM_NEWADDR, 0);
26932566
PM		 3389 if (err < 0) {
3390 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3391 WARN_ON(err == -EMSGSIZE);
3392 kfree_skb(skb);
3393 goto errout_ifa;
3394 }
2942e900 3395 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
1b29fc2c 3396errout_ifa:
6c223828 3397 in6_ifa_put(ifa);
1b29fc2c 3398errout:
6c223828 3399 return err;
6c223828
NT		 3400}
3401
1da177e4
LT		 3402static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3403{
3404 struct sk_buff *skb;
5d620266 3405 int err = -ENOBUFS;
1da177e4 3406
0ab6803b 3407 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5d620266
TG		 3408 if (skb == NULL)
3409 goto errout;
3410
3411 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
26932566
PM		 3412 if (err < 0) {
3413 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3414 WARN_ON(err == -EMSGSIZE);
3415 kfree_skb(skb);
3416 goto errout;
3417 }
5d620266
TG		 3418 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3419errout:
3420 if (err < 0)
3421 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3422}
3423
b6f99a21 3424static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
1da177e4
LT		 3425 __s32 *array, int bytes)
3426{
04561c1f
TG		 3427 BUG_ON(bytes < (DEVCONF_MAX * 4));
3428
1da177e4
LT		 3429 memset(array, 0, bytes);
3430 array[DEVCONF_FORWARDING] = cnf->forwarding;
3431 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3432 array[DEVCONF_MTU6] = cnf->mtu6;
3433 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3434 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3435 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3436 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3437 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3438 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3439 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3440 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3441#ifdef CONFIG_IPV6_PRIVACY
3442 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3443 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3444 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3445 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3446 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3447#endif
3448 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
65f5c7c1 3449 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
c4fd30eb 3450 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
930d6ff2
YH		 3451#ifdef CONFIG_IPV6_ROUTER_PREF
3452 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
52e16356 3453 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
fa03ef38 3454#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 3455 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3456#endif
930d6ff2 3457#endif
fbea49e1 3458 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
0bcbc926 3459 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
95c385b4
NH		 3460#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3461 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3462#endif
1da177e4
LT		 3463}
3464
339bf98f
TG		 3465static inline size_t inet6_if_nlmsg_size(void)
3466{
3467 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3468 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3469 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3470 + nla_total_size(4) /* IFLA_MTU */
3471 + nla_total_size(4) /* IFLA_LINK */
3472 + nla_total_size( /* IFLA_PROTINFO */
3473 nla_total_size(4) /* IFLA_INET6_FLAGS */
3474 + nla_total_size(sizeof(struct ifla_cacheinfo))
3475 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
bf99f1bd
YH		 3476 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3477 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
339bf98f
TG		 3478 );
3479}
c5396a31 3480
7f7d9a6b
HX		 3481static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3482 int bytes)
3483{
3484 int i;
3485 int pad = bytes - sizeof(u64) * items;
3486 BUG_ON(pad < 0);
3487
3488 /* Use put_unaligned() because stats may not be aligned for u64. */
3489 put_unaligned(items, &stats[0]);
3490 for (i = 1; i < items; i++)
3491 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3492
3493 memset(&stats[items], 0, pad);
3494}
3495
3496static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3497 int bytes)
3498{
3499 switch(attrtype) {
3500 case IFLA_INET6_STATS:
3501 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3502 break;
3503 case IFLA_INET6_ICMP6STATS:
3504 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3505 break;
3506 }
3507}
3508
1ab1457c 3509static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
b6544c0b 3510 u32 pid, u32 seq, int event, unsigned int flags)
1da177e4 3511{
04561c1f 3512 struct net_device *dev = idev->dev;
bf99f1bd 3513 struct nlattr *nla;
04561c1f
TG		 3514 struct ifinfomsg *hdr;
3515 struct nlmsghdr *nlh;
3516 void *protoinfo;
3517 struct ifla_cacheinfo ci;
3518
3519 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3520 if (nlh == NULL)
26932566 3521 return -EMSGSIZE;
04561c1f
TG		 3522
3523 hdr = nlmsg_data(nlh);
3524 hdr->ifi_family = AF_INET6;
3525 hdr->__ifi_pad = 0;
3526 hdr->ifi_type = dev->type;
3527 hdr->ifi_index = dev->ifindex;
3528 hdr->ifi_flags = dev_get_flags(dev);
3529 hdr->ifi_change = 0;
3530
3531 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
1da177e4
LT		 3532
3533 if (dev->addr_len)
04561c1f 3534 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
1da177e4 3535
04561c1f 3536 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
1da177e4 3537 if (dev->ifindex != dev->iflink)
04561c1f 3538 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
1da177e4 3539
04561c1f
TG		 3540 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3541 if (protoinfo == NULL)
3542 goto nla_put_failure;
1da177e4 3543
04561c1f 3544 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
1da177e4 3545
1da177e4
LT		 3546 ci.max_reasm_len = IPV6_MAXPLEN;
3547 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3548 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3549 ci.reachable_time = idev->nd_parms->reachable_time;
3550 ci.retrans_time = idev->nd_parms->retrans_time;
04561c1f
TG		 3551 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3552
bf99f1bd
YH		 3553 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3554 if (nla == NULL)
04561c1f 3555 goto nla_put_failure;
bf99f1bd 3556 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
1da177e4 3557
bf99f1bd
YH		 3558 /* XXX - MC not implemented */
3559
3560 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3561 if (nla == NULL)
3562 goto nla_put_failure;
3563 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3564
3565 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3566 if (nla == NULL)
3567 goto nla_put_failure;
3568 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
1da177e4 3569
04561c1f
TG		 3570 nla_nest_end(skb, protoinfo);
3571 return nlmsg_end(skb, nlh);
1da177e4 3572
04561c1f 3573nla_put_failure:
26932566
PM		 3574 nlmsg_cancel(skb, nlh);
3575 return -EMSGSIZE;
1da177e4
LT		 3576}
3577
3578static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3579{
3580 int idx, err;
3581 int s_idx = cb->args[0];
3582 struct net_device *dev;
3583 struct inet6_dev *idev;
3584
3585 read_lock(&dev_base_lock);
7562f876 3586 idx = 0;
881d966b 3587 for_each_netdev(&init_net, dev) {
1da177e4 3588 if (idx < s_idx)
7562f876 3589 goto cont;
1da177e4 3590 if ((idev = in6_dev_get(dev)) == NULL)
7562f876 3591 goto cont;
1ab1457c 3592 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
b6544c0b 3593 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
1da177e4
LT		 3594 in6_dev_put(idev);
3595 if (err <= 0)
3596 break;
7562f876
PE		 3597cont:
3598 idx++;
1da177e4
LT		 3599 }
3600 read_unlock(&dev_base_lock);
3601 cb->args[0] = idx;
3602
3603 return skb->len;
3604}
3605
3606void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3607{
3608 struct sk_buff *skb;
8d7a76c9 3609 int err = -ENOBUFS;
1ab1457c 3610
339bf98f 3611 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
8d7a76c9
TG		 3612 if (skb == NULL)
3613 goto errout;
3614
3615 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
26932566
PM		 3616 if (err < 0) {
3617 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3618 WARN_ON(err == -EMSGSIZE);
3619 kfree_skb(skb);
3620 goto errout;
3621 }
8d7a76c9
TG		 3622 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3623errout:
3624 if (err < 0)
3625 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
1da177e4
LT		 3626}
3627
339bf98f
TG		 3628static inline size_t inet6_prefix_nlmsg_size(void)
3629{
3630 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3631 + nla_total_size(sizeof(struct in6_addr))
3632 + nla_total_size(sizeof(struct prefix_cacheinfo));
3633}
c5396a31 3634
1da177e4 3635static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6051e2f4
TG		 3636 struct prefix_info *pinfo, u32 pid, u32 seq,
3637 int event, unsigned int flags)
1da177e4 3638{
6051e2f4
TG		 3639 struct prefixmsg *pmsg;
3640 struct nlmsghdr *nlh;
1da177e4
LT		 3641 struct prefix_cacheinfo ci;
3642
6051e2f4
TG		 3643 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3644 if (nlh == NULL)
26932566 3645 return -EMSGSIZE;
6051e2f4
TG		 3646
3647 pmsg = nlmsg_data(nlh);
1da177e4 3648 pmsg->prefix_family = AF_INET6;
8a47077a
PM		 3649 pmsg->prefix_pad1 = 0;
3650 pmsg->prefix_pad2 = 0;
1da177e4
LT		 3651 pmsg->prefix_ifindex = idev->dev->ifindex;
3652 pmsg->prefix_len = pinfo->prefix_len;
3653 pmsg->prefix_type = pinfo->type;
8a47077a 3654 pmsg->prefix_pad3 = 0;
1da177e4
LT		 3655 pmsg->prefix_flags = 0;
3656 if (pinfo->onlink)
3657 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3658 if (pinfo->autoconf)
3659 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3660
6051e2f4 3661 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
1da177e4
LT		 3662
3663 ci.preferred_time = ntohl(pinfo->prefered);
3664 ci.valid_time = ntohl(pinfo->valid);
6051e2f4 3665 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
1da177e4 3666
6051e2f4 3667 return nlmsg_end(skb, nlh);
1da177e4 3668
6051e2f4 3669nla_put_failure:
26932566
PM		 3670 nlmsg_cancel(skb, nlh);
3671 return -EMSGSIZE;
1da177e4
LT		 3672}
3673
1ab1457c 3674static void inet6_prefix_notify(int event, struct inet6_dev *idev,
1da177e4
LT		 3675 struct prefix_info *pinfo)
3676{
3677 struct sk_buff *skb;
8c384bfa 3678 int err = -ENOBUFS;
1da177e4 3679
339bf98f 3680 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
8c384bfa
TG		 3681 if (skb == NULL)
3682 goto errout;
3683
3684 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
26932566
PM		 3685 if (err < 0) {
3686 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3687 WARN_ON(err == -EMSGSIZE);
3688 kfree_skb(skb);
3689 goto errout;
3690 }
8c384bfa
TG		 3691 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3692errout:
3693 if (err < 0)
3694 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
1da177e4
LT		 3695}
3696
1da177e4
LT		 3697static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3698{
3699 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3700
3701 switch (event) {
3702 case RTM_NEWADDR:
95c385b4
NH		 3703 /*
3704 * If the address was optimistic
3705 * we inserted the route at the start of
3706 * our DAD process, so we don't need
3707 * to do it again
3708 */
3709 if (!(ifp->rt->rt6i_node))
3710 ip6_ins_rt(ifp->rt);
1da177e4
LT		 3711 if (ifp->idev->cnf.forwarding)
3712 addrconf_join_anycast(ifp);
3713 break;
3714 case RTM_DELADDR:
3715 if (ifp->idev->cnf.forwarding)
3716 addrconf_leave_anycast(ifp);
3717 addrconf_leave_solict(ifp->idev, &ifp->addr);
3718 dst_hold(&ifp->rt->u.dst);
e0a1ad73 3719 if (ip6_del_rt(ifp->rt))
1da177e4 3720 dst_free(&ifp->rt->u.dst);
1da177e4
LT		 3721 break;
3722 }
3723}
3724
3725static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3726{
8814c4b5 3727 rcu_read_lock_bh();
1da177e4
LT		 3728 if (likely(ifp->idev->dead == 0))
3729 __ipv6_ifa_notify(event, ifp);
8814c4b5 3730 rcu_read_unlock_bh();
1da177e4
LT		 3731}
3732
3733#ifdef CONFIG_SYSCTL
3734
3735static
3736int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3737 void __user *buffer, size_t *lenp, loff_t *ppos)
3738{
3739 int *valp = ctl->data;
3740 int val = *valp;
3741 int ret;
3742
3743 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3744
3745 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3746 if (valp != &ipv6_devconf.forwarding) {
3747 if ((!*valp) ^ (!val)) {
3748 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3749 if (idev == NULL)
3750 return ret;
3751 dev_forward_change(idev);
3752 }
3753 } else {
3754 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3755 addrconf_forward_change();
3756 }
3757 if (*valp)
3758 rt6_purge_dflt_routers();
3759 }
3760
1ab1457c 3761 return ret;
1da177e4
LT		 3762}
3763
1ab1457c 3764static int addrconf_sysctl_forward_strategy(ctl_table *table,
1da177e4
LT		 3765 int __user *name, int nlen,
3766 void __user *oldval,
3767 size_t __user *oldlenp,
1f29bcd7 3768 void __user *newval, size_t newlen)
1da177e4
LT		 3769{
3770 int *valp = table->data;
3771 int new;
3772
3773 if (!newval || !newlen)
3774 return 0;
3775 if (newlen != sizeof(int))
3776 return -EINVAL;
3777 if (get_user(new, (int __user *)newval))
3778 return -EFAULT;
3779 if (new == *valp)
3780 return 0;
3781 if (oldval && oldlenp) {
3782 size_t len;
3783 if (get_user(len, oldlenp))
3784 return -EFAULT;
3785 if (len) {
3786 if (len > table->maxlen)
3787 len = table->maxlen;
3788 if (copy_to_user(oldval, valp, len))
3789 return -EFAULT;
3790 if (put_user(len, oldlenp))
3791 return -EFAULT;
3792 }
3793 }
3794
3795 if (valp != &ipv6_devconf_dflt.forwarding) {
3796 if (valp != &ipv6_devconf.forwarding) {
3797 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3798 int changed;
3799 if (unlikely(idev == NULL))
3800 return -ENODEV;
3801 changed = (!*valp) ^ (!new);
3802 *valp = new;
3803 if (changed)
3804 dev_forward_change(idev);
3805 } else {
3806 *valp = new;
3807 addrconf_forward_change();
3808 }
3809
3810 if (*valp)
3811 rt6_purge_dflt_routers();
3812 } else
3813 *valp = new;
3814
3815 return 1;
3816}
3817
3818static struct addrconf_sysctl_table
3819{
3820 struct ctl_table_header *sysctl_header;
3821 ctl_table addrconf_vars[__NET_IPV6_MAX];
3822 ctl_table addrconf_dev[2];
3823 ctl_table addrconf_conf_dir[2];
3824 ctl_table addrconf_proto_dir[2];
3825 ctl_table addrconf_root_dir[2];
ab32ea5d 3826} addrconf_sysctl __read_mostly = {
1da177e4
LT		 3827 .sysctl_header = NULL,
3828 .addrconf_vars = {
1ab1457c 3829 {
1da177e4
LT		 3830 .ctl_name = NET_IPV6_FORWARDING,
3831 .procname = "forwarding",
1ab1457c 3832 .data = &ipv6_devconf.forwarding,
1da177e4
LT		 3833 .maxlen = sizeof(int),
3834 .mode = 0644,
1ab1457c 3835 .proc_handler = &addrconf_sysctl_forward,
1da177e4
LT		 3836 .strategy = &addrconf_sysctl_forward_strategy,
3837 },
3838 {
3839 .ctl_name = NET_IPV6_HOP_LIMIT,
3840 .procname = "hop_limit",
1ab1457c 3841 .data = &ipv6_devconf.hop_limit,
1da177e4
LT		 3842 .maxlen = sizeof(int),
3843 .mode = 0644,
3844 .proc_handler = proc_dointvec,
3845 },
3846 {
3847 .ctl_name = NET_IPV6_MTU,
3848 .procname = "mtu",
3849 .data = &ipv6_devconf.mtu6,
1ab1457c 3850 .maxlen = sizeof(int),
1da177e4 3851 .mode = 0644,
1ab1457c 3852 .proc_handler = &proc_dointvec,
1da177e4
LT		 3853 },
3854 {
3855 .ctl_name = NET_IPV6_ACCEPT_RA,
3856 .procname = "accept_ra",
1ab1457c 3857 .data = &ipv6_devconf.accept_ra,
1da177e4
LT		 3858 .maxlen = sizeof(int),
3859 .mode = 0644,
1ab1457c 3860 .proc_handler = &proc_dointvec,
1da177e4
LT		 3861 },
3862 {
3863 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3864 .procname = "accept_redirects",
1ab1457c 3865 .data = &ipv6_devconf.accept_redirects,
1da177e4
LT		 3866 .maxlen = sizeof(int),
3867 .mode = 0644,
1ab1457c 3868 .proc_handler = &proc_dointvec,
1da177e4
LT		 3869 },
3870 {
3871 .ctl_name = NET_IPV6_AUTOCONF,
3872 .procname = "autoconf",
1ab1457c 3873 .data = &ipv6_devconf.autoconf,
1da177e4
LT		 3874 .maxlen = sizeof(int),
3875 .mode = 0644,
1ab1457c 3876 .proc_handler = &proc_dointvec,
1da177e4
LT		 3877 },
3878 {
3879 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3880 .procname = "dad_transmits",
1ab1457c 3881 .data = &ipv6_devconf.dad_transmits,
1da177e4
LT		 3882 .maxlen = sizeof(int),
3883 .mode = 0644,
1ab1457c 3884 .proc_handler = &proc_dointvec,
1da177e4
LT		 3885 },
3886 {
3887 .ctl_name = NET_IPV6_RTR_SOLICITS,
3888 .procname = "router_solicitations",
1ab1457c 3889 .data = &ipv6_devconf.rtr_solicits,
1da177e4
LT		 3890 .maxlen = sizeof(int),
3891 .mode = 0644,
1ab1457c 3892 .proc_handler = &proc_dointvec,
1da177e4
LT		 3893 },
3894 {
3895 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3896 .procname = "router_solicitation_interval",
1ab1457c 3897 .data = &ipv6_devconf.rtr_solicit_interval,
1da177e4
LT		 3898 .maxlen = sizeof(int),
3899 .mode = 0644,
1ab1457c 3900 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3901 .strategy = &sysctl_jiffies,
3902 },
3903 {
3904 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3905 .procname = "router_solicitation_delay",
1ab1457c 3906 .data = &ipv6_devconf.rtr_solicit_delay,
1da177e4
LT		 3907 .maxlen = sizeof(int),
3908 .mode = 0644,
1ab1457c 3909 .proc_handler = &proc_dointvec_jiffies,
1da177e4
LT		 3910 .strategy = &sysctl_jiffies,
3911 },
3912 {
3913 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3914 .procname = "force_mld_version",
1ab1457c 3915 .data = &ipv6_devconf.force_mld_version,
1da177e4
LT		 3916 .maxlen = sizeof(int),
3917 .mode = 0644,
1ab1457c 3918 .proc_handler = &proc_dointvec,
1da177e4
LT		 3919 },
3920#ifdef CONFIG_IPV6_PRIVACY
3921 {
3922 .ctl_name = NET_IPV6_USE_TEMPADDR,
3923 .procname = "use_tempaddr",
1ab1457c 3924 .data = &ipv6_devconf.use_tempaddr,
1da177e4
LT		 3925 .maxlen = sizeof(int),
3926 .mode = 0644,
1ab1457c 3927 .proc_handler = &proc_dointvec,
1da177e4
LT		 3928 },
3929 {
3930 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3931 .procname = "temp_valid_lft",
1ab1457c 3932 .data = &ipv6_devconf.temp_valid_lft,
1da177e4
LT		 3933 .maxlen = sizeof(int),
3934 .mode = 0644,
1ab1457c 3935 .proc_handler = &proc_dointvec,
1da177e4
LT		 3936 },
3937 {
3938 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3939 .procname = "temp_prefered_lft",
1ab1457c 3940 .data = &ipv6_devconf.temp_prefered_lft,
1da177e4
LT		 3941 .maxlen = sizeof(int),
3942 .mode = 0644,
1ab1457c 3943 .proc_handler = &proc_dointvec,
1da177e4
LT		 3944 },
3945 {
3946 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3947 .procname = "regen_max_retry",
1ab1457c 3948 .data = &ipv6_devconf.regen_max_retry,
1da177e4
LT		 3949 .maxlen = sizeof(int),
3950 .mode = 0644,
1ab1457c 3951 .proc_handler = &proc_dointvec,
1da177e4
LT		 3952 },
3953 {
3954 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3955 .procname = "max_desync_factor",
1ab1457c 3956 .data = &ipv6_devconf.max_desync_factor,
1da177e4
LT		 3957 .maxlen = sizeof(int),
3958 .mode = 0644,
1ab1457c 3959 .proc_handler = &proc_dointvec,
1da177e4
LT		 3960 },
3961#endif
3962 {
3963 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3964 .procname = "max_addresses",
3965 .data = &ipv6_devconf.max_addresses,
3966 .maxlen = sizeof(int),
3967 .mode = 0644,
3968 .proc_handler = &proc_dointvec,
3969 },
65f5c7c1
YH		 3970 {
3971 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3972 .procname = "accept_ra_defrtr",
1ab1457c 3973 .data = &ipv6_devconf.accept_ra_defrtr,
65f5c7c1
YH		 3974 .maxlen = sizeof(int),
3975 .mode = 0644,
1ab1457c 3976 .proc_handler = &proc_dointvec,
65f5c7c1 3977 },
c4fd30eb
YH		 3978 {
3979 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3980 .procname = "accept_ra_pinfo",
1ab1457c 3981 .data = &ipv6_devconf.accept_ra_pinfo,
c4fd30eb
YH		 3982 .maxlen = sizeof(int),
3983 .mode = 0644,
1ab1457c 3984 .proc_handler = &proc_dointvec,
c4fd30eb 3985 },
930d6ff2
YH		 3986#ifdef CONFIG_IPV6_ROUTER_PREF
3987 {
3988 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3989 .procname = "accept_ra_rtr_pref",
3990 .data = &ipv6_devconf.accept_ra_rtr_pref,
3991 .maxlen = sizeof(int),
3992 .mode = 0644,
3993 .proc_handler = &proc_dointvec,
3994 },
52e16356
YH		 3995 {
3996 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3997 .procname = "router_probe_interval",
3998 .data = &ipv6_devconf.rtr_probe_interval,
3999 .maxlen = sizeof(int),
4000 .mode = 0644,
4001 .proc_handler = &proc_dointvec_jiffies,
4002 .strategy = &sysctl_jiffies,
4003 },
fa03ef38 4004#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4
YH		 4005 {
4006 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4007 .procname = "accept_ra_rt_info_max_plen",
4008 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4009 .maxlen = sizeof(int),
4010 .mode = 0644,
4011 .proc_handler = &proc_dointvec,
4012 },
4013#endif
930d6ff2 4014#endif
fbea49e1
YH		 4015 {
4016 .ctl_name = NET_IPV6_PROXY_NDP,
4017 .procname = "proxy_ndp",
4018 .data = &ipv6_devconf.proxy_ndp,
4019 .maxlen = sizeof(int),
4020 .mode = 0644,
4021 .proc_handler = &proc_dointvec,
4022 },
0bcbc926
YH		 4023 {
4024 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4025 .procname = "accept_source_route",
4026 .data = &ipv6_devconf.accept_source_route,
4027 .maxlen = sizeof(int),
4028 .mode = 0644,
4029 .proc_handler = &proc_dointvec,
4030 },
95c385b4
NH		 4031#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4032 {
4033 .ctl_name = CTL_UNNUMBERED,
4034 .procname = "optimistic_dad",
4035 .data = &ipv6_devconf.optimistic_dad,
4036 .maxlen = sizeof(int),
4037 .mode = 0644,
4038 .proc_handler = &proc_dointvec,
4039
4040 },
4041#endif
1da177e4
LT		 4042 {
4043 .ctl_name = 0, /* sentinel */
4044 }
4045 },
4046 .addrconf_dev = {
4047 {
4048 .ctl_name = NET_PROTO_CONF_ALL,
4049 .procname = "all",
4050 .mode = 0555,
4051 .child = addrconf_sysctl.addrconf_vars,
4052 },
4053 {
4054 .ctl_name = 0, /* sentinel */
4055 }
4056 },
4057 .addrconf_conf_dir = {
4058 {
4059 .ctl_name = NET_IPV6_CONF,
4060 .procname = "conf",
4061 .mode = 0555,
4062 .child = addrconf_sysctl.addrconf_dev,
4063 },
4064 {
4065 .ctl_name = 0, /* sentinel */
4066 }
4067 },
4068 .addrconf_proto_dir = {
4069 {
4070 .ctl_name = NET_IPV6,
4071 .procname = "ipv6",
4072 .mode = 0555,
4073 .child = addrconf_sysctl.addrconf_conf_dir,
4074 },
4075 {
4076 .ctl_name = 0, /* sentinel */
4077 }
4078 },
4079 .addrconf_root_dir = {
4080 {
4081 .ctl_name = CTL_NET,
4082 .procname = "net",
4083 .mode = 0555,
4084 .child = addrconf_sysctl.addrconf_proto_dir,
4085 },
4086 {
4087 .ctl_name = 0, /* sentinel */
4088 }
4089 },
4090};
4091
4092static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4093{
4094 int i;
4095 struct net_device *dev = idev ? idev->dev : NULL;
4096 struct addrconf_sysctl_table *t;
4097 char *dev_name = NULL;
4098
af879cc7 4099 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
1da177e4
LT		 4100 if (t == NULL)
4101 return;
1da177e4
LT		 4102 for (i=0; t->addrconf_vars[i].data; i++) {
4103 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
1da177e4
LT		 4104 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4105 }
4106 if (dev) {
1ab1457c 4107 dev_name = dev->name;
1da177e4
LT		 4108 t->addrconf_dev[0].ctl_name = dev->ifindex;
4109 } else {
4110 dev_name = "default";
4111 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4112 }
4113
1ab1457c
YH		 4114 /*
4115 * Make a copy of dev_name, because '.procname' is regarded as const
1da177e4
LT		 4116 * by sysctl and we wouldn't want anyone to change it under our feet
4117 * (see SIOCSIFNAME).
1ab1457c 4118 */
543537bd 4119 dev_name = kstrdup(dev_name, GFP_KERNEL);
1da177e4
LT		 4120 if (!dev_name)
4121 goto free;
4122
4123 t->addrconf_dev[0].procname = dev_name;
4124
4125 t->addrconf_dev[0].child = t->addrconf_vars;
1da177e4 4126 t->addrconf_conf_dir[0].child = t->addrconf_dev;
1da177e4 4127 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
1da177e4 4128 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
1da177e4 4129
0b4d4147 4130 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
1da177e4
LT		 4131 if (t->sysctl_header == NULL)
4132 goto free_procname;
4133 else
4134 p->sysctl = t;
4135 return;
4136
4137 /* error path */
4138 free_procname:
4139 kfree(dev_name);
4140 free:
4141 kfree(t);
4142
4143 return;
4144}
4145
4146static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4147{
4148 if (p->sysctl) {
4149 struct addrconf_sysctl_table *t = p->sysctl;
4150 p->sysctl = NULL;
4151 unregister_sysctl_table(t->sysctl_header);
4152 kfree(t->addrconf_dev[0].procname);
4153 kfree(t);
4154 }
4155}
4156
4157
4158#endif
4159
4160/*
4161 * Device notifier
4162 */
4163
4164int register_inet6addr_notifier(struct notifier_block *nb)
4165{
1ab1457c 4166 return atomic_notifier_chain_register(&inet6addr_chain, nb);
1da177e4
LT		 4167}
4168
7159039a
YH		 4169EXPORT_SYMBOL(register_inet6addr_notifier);
4170
1da177e4
LT		 4171int unregister_inet6addr_notifier(struct notifier_block *nb)
4172{
1ab1457c 4173 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
1da177e4
LT		 4174}
4175
7159039a
YH		 4176EXPORT_SYMBOL(unregister_inet6addr_notifier);
4177
1da177e4
LT		 4178/*
4179 * Init / cleanup code
4180 */
4181
4182int __init addrconf_init(void)
4183{
4184 int err = 0;
4185
4186 /* The addrconf netdev notifier requires that loopback_dev
4187 * has it's ipv6 private information allocated and setup
4188 * before it can bring up and give link-local addresses
4189 * to other devices which are up.
4190 *
4191 * Unfortunately, loopback_dev is not necessarily the first
4192 * entry in the global dev_base list of net devices. In fact,
4193 * it is likely to be the very last entry on that list.
4194 * So this causes the notifier registry below to try and
4195 * give link-local addresses to all devices besides loopback_dev
4196 * first, then loopback_dev, which cases all the non-loopback_dev
4197 * devices to fail to get a link-local address.
4198 *
4199 * So, as a temporary fix, allocate the ipv6 structure for
4200 * loopback_dev first by hand.
4201 * Longer term, all of the dependencies ipv6 has upon the loopback
4202 * device and it being up should be removed.
4203 */
4204 rtnl_lock();
2774c7ab 4205 if (!ipv6_add_dev(init_net.loopback_dev))
1da177e4
LT		 4206 err = -ENOMEM;
4207 rtnl_unlock();
4208 if (err)
4209 return err;
4210
2774c7ab
EB		 4211 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4212 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4213#ifdef CONFIG_IPV6_MULTIPLE_TABLES
2774c7ab
EB		 4214 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4215 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4216 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4217 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
9a6bf6fe 4218#endif
c62dba90 4219
1da177e4
LT		 4220 register_netdevice_notifier(&ipv6_dev_notf);
4221
1da177e4 4222 addrconf_verify(0);
c127ea2c
TG		 4223
4224 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4225 if (err < 0)
4226 goto errout;
4227
4228 /* Only the first call to __rtnl_register can fail */
4229 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4230 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4231 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4232 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4233 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4234
1da177e4
LT		 4235#ifdef CONFIG_SYSCTL
4236 addrconf_sysctl.sysctl_header =
0b4d4147 4237 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
1da177e4
LT		 4238 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4239#endif
4240
4241 return 0;
c127ea2c
TG		 4242errout:
4243 unregister_netdevice_notifier(&ipv6_dev_notf);
4244
4245 return err;
1da177e4
LT		 4246}
4247
4248void __exit addrconf_cleanup(void)
4249{
1ab1457c 4250 struct net_device *dev;
1ab1457c 4251 struct inet6_ifaddr *ifa;
1da177e4
LT		 4252 int i;
4253
4254 unregister_netdevice_notifier(&ipv6_dev_notf);
4255
1da177e4
LT		 4256#ifdef CONFIG_SYSCTL
4257 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4258 addrconf_sysctl_unregister(&ipv6_devconf);
4259#endif
4260
4261 rtnl_lock();
4262
4263 /*
4264 * clean dev list.
4265 */
4266
881d966b 4267 for_each_netdev(&init_net, dev) {
dffe4f04 4268 if (__in6_dev_get(dev) == NULL)
1da177e4
LT		 4269 continue;
4270 addrconf_ifdown(dev, 1);
4271 }
2774c7ab 4272 addrconf_ifdown(init_net.loopback_dev, 2);
1da177e4
LT		 4273
4274 /*
4275 * Check hash table.
4276 */
4277
4278 write_lock_bh(&addrconf_hash_lock);
4279 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4280 for (ifa=inet6_addr_lst[i]; ifa; ) {
4281 struct inet6_ifaddr *bifa;
4282
4283 bifa = ifa;
4284 ifa = ifa->lst_next;
4285 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4286 /* Do not free it; something is wrong.
4287 Now we can investigate it with debugger.
4288 */
4289 }
4290 }
4291 write_unlock_bh(&addrconf_hash_lock);
4292
4293 del_timer(&addr_chk_timer);
4294
4295 rtnl_unlock();
4296
1da177e4 4297#ifdef CONFIG_PROC_FS
457c4cbc 4298 proc_net_remove(&init_net, "if_inet6");
1da177e4
LT		 4299#endif
4300}
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